1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 #include "elf/xtensa.h"
31 #include "xtensa-isa.h"
32 #include "xtensa-config.h"
34 #define XTENSA_NO_NOP_REMOVAL 0
36 /* Local helper functions. */
38 static bfd_boolean add_extra_plt_sections (struct bfd_link_info *, int);
39 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *, bfd_vma *);
47 /* Local functions to handle Xtensa configurability. */
49 static bfd_boolean is_indirect_call_opcode (xtensa_opcode);
50 static bfd_boolean is_direct_call_opcode (xtensa_opcode);
51 static bfd_boolean is_windowed_call_opcode (xtensa_opcode);
52 static xtensa_opcode get_const16_opcode (void);
53 static xtensa_opcode get_l32r_opcode (void);
54 static bfd_vma l32r_offset (bfd_vma, bfd_vma);
55 static int get_relocation_opnd (xtensa_opcode, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
59 static bfd_boolean is_l32r_relocation
60 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *);
61 static bfd_boolean is_alt_relocation (int);
62 static bfd_boolean is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte *, bfd_size_type, bfd_size_type);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte *, bfd_size_type, bfd_size_type, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma);
71 static bfd_boolean check_branch_target_aligned_address (bfd_vma, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte *, bfd_size_type, bfd_size_type);
75 /* Functions for link-time code simplifications. */
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte *, bfd_vma, bfd_vma, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte *, bfd_vma, Elf_Internal_Rela *, char **);
81 static xtensa_opcode swap_callx_for_call_opcode (xtensa_opcode);
82 static xtensa_opcode get_expanded_call_opcode (bfd_byte *, int, bfd_boolean *);
84 /* Access to internal relocations, section contents and symbols. */
86 static Elf_Internal_Rela *retrieve_internal_relocs
87 (bfd *, asection *, bfd_boolean);
88 static void pin_internal_relocs (asection *, Elf_Internal_Rela *);
89 static void release_internal_relocs (asection *, Elf_Internal_Rela *);
90 static bfd_byte *retrieve_contents (bfd *, asection *, bfd_boolean);
91 static void pin_contents (asection *, bfd_byte *);
92 static void release_contents (asection *, bfd_byte *);
93 static Elf_Internal_Sym *retrieve_local_syms (bfd *);
95 /* Miscellaneous utility functions. */
97 static asection *elf_xtensa_get_plt_section (struct bfd_link_info *, int);
98 static asection *elf_xtensa_get_gotplt_section (struct bfd_link_info *, int);
99 static asection *get_elf_r_symndx_section (bfd *, unsigned long);
100 static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry
101 (bfd *, unsigned long);
102 static bfd_vma get_elf_r_symndx_offset (bfd *, unsigned long);
103 static bfd_boolean is_reloc_sym_weak (bfd *, Elf_Internal_Rela *);
104 static bfd_boolean pcrel_reloc_fits (xtensa_opcode, int, bfd_vma, bfd_vma);
105 static bfd_boolean xtensa_is_property_section (asection *);
106 static bfd_boolean xtensa_is_littable_section (asection *);
107 static int internal_reloc_compare (const void *, const void *);
108 static int internal_reloc_matches (const void *, const void *);
109 extern asection *xtensa_get_property_section (asection *, const char *);
110 static flagword xtensa_get_property_predef_flags (asection *);
112 /* Other functions called directly by the linker. */
114 typedef void (*deps_callback_t)
115 (asection *, bfd_vma, asection *, bfd_vma, void *);
116 extern bfd_boolean xtensa_callback_required_dependence
117 (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *);
120 /* Globally visible flag for choosing size optimization of NOP removal
121 instead of branch-target-aware minimization for NOP removal.
122 When nonzero, narrow all instructions and remove all NOPs possible
123 around longcall expansions. */
125 int elf32xtensa_size_opt;
128 /* The "new_section_hook" is used to set up a per-section
129 "xtensa_relax_info" data structure with additional information used
130 during relaxation. */
132 typedef struct xtensa_relax_info_struct xtensa_relax_info;
135 /* The GNU tools do not easily allow extending interfaces to pass around
136 the pointer to the Xtensa ISA information, so instead we add a global
137 variable here (in BFD) that can be used by any of the tools that need
140 xtensa_isa xtensa_default_isa;
143 /* When this is true, relocations may have been modified to refer to
144 symbols from other input files. The per-section list of "fix"
145 records needs to be checked when resolving relocations. */
147 static bfd_boolean relaxing_section = FALSE;
149 /* When this is true, during final links, literals that cannot be
150 coalesced and their relocations may be moved to other sections. */
152 int elf32xtensa_no_literal_movement = 1;
155 static reloc_howto_type elf_howto_table[] =
157 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
158 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
160 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
161 bfd_elf_xtensa_reloc, "R_XTENSA_32",
162 TRUE, 0xffffffff, 0xffffffff, FALSE),
164 /* Replace a 32-bit value with a value from the runtime linker (only
165 used by linker-generated stub functions). The r_addend value is
166 special: 1 means to substitute a pointer to the runtime linker's
167 dynamic resolver function; 2 means to substitute the link map for
168 the shared object. */
169 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
170 NULL, "R_XTENSA_RTLD", FALSE, 0, 0, FALSE),
172 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
173 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
174 FALSE, 0, 0xffffffff, FALSE),
175 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
177 FALSE, 0, 0xffffffff, FALSE),
178 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
180 FALSE, 0, 0xffffffff, FALSE),
181 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
182 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
183 FALSE, 0, 0xffffffff, FALSE),
187 /* Old relocations for backward compatibility. */
188 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
189 bfd_elf_xtensa_reloc, "R_XTENSA_OP0", FALSE, 0, 0, TRUE),
190 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
191 bfd_elf_xtensa_reloc, "R_XTENSA_OP1", FALSE, 0, 0, TRUE),
192 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
193 bfd_elf_xtensa_reloc, "R_XTENSA_OP2", FALSE, 0, 0, TRUE),
195 /* Assembly auto-expansion. */
196 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
197 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND", FALSE, 0, 0, TRUE),
198 /* Relax assembly auto-expansion. */
199 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
200 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY", FALSE, 0, 0, TRUE),
205 /* GNU extension to record C++ vtable hierarchy. */
206 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
207 NULL, "R_XTENSA_GNU_VTINHERIT",
209 /* GNU extension to record C++ vtable member usage. */
210 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
211 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
214 /* Relocations for supporting difference of symbols. */
215 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
216 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8", FALSE, 0, 0xff, FALSE),
217 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
218 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16", FALSE, 0, 0xffff, FALSE),
219 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
220 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32", FALSE, 0, 0xffffffff, FALSE),
222 /* General immediate operand relocations. */
223 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
224 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP", FALSE, 0, 0, TRUE),
225 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
226 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP", FALSE, 0, 0, TRUE),
227 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
228 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP", FALSE, 0, 0, TRUE),
229 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
230 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP", FALSE, 0, 0, TRUE),
231 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
232 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP", FALSE, 0, 0, TRUE),
233 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
234 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP", FALSE, 0, 0, TRUE),
235 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
236 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP", FALSE, 0, 0, TRUE),
237 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
238 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP", FALSE, 0, 0, TRUE),
239 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
240 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP", FALSE, 0, 0, TRUE),
241 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
242 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP", FALSE, 0, 0, TRUE),
243 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
244 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP", FALSE, 0, 0, TRUE),
245 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
246 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP", FALSE, 0, 0, TRUE),
247 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
248 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP", FALSE, 0, 0, TRUE),
249 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
250 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP", FALSE, 0, 0, TRUE),
251 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
252 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP", FALSE, 0, 0, TRUE),
254 /* "Alternate" relocations. The meaning of these is opcode-specific. */
255 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
256 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT", FALSE, 0, 0, TRUE),
257 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
258 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT", FALSE, 0, 0, TRUE),
259 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
260 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT", FALSE, 0, 0, TRUE),
261 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
262 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT", FALSE, 0, 0, TRUE),
263 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
264 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT", FALSE, 0, 0, TRUE),
265 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
266 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT", FALSE, 0, 0, TRUE),
267 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
268 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT", FALSE, 0, 0, TRUE),
269 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
270 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT", FALSE, 0, 0, TRUE),
271 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
272 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT", FALSE, 0, 0, TRUE),
273 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
274 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT", FALSE, 0, 0, TRUE),
275 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
276 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT", FALSE, 0, 0, TRUE),
277 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
278 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT", FALSE, 0, 0, TRUE),
279 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
280 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT", FALSE, 0, 0, TRUE),
281 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
282 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT", FALSE, 0, 0, TRUE),
283 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
284 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT", FALSE, 0, 0, TRUE),
289 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
294 static reloc_howto_type *
295 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
296 bfd_reloc_code_real_type code)
301 TRACE ("BFD_RELOC_NONE");
302 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
305 TRACE ("BFD_RELOC_32");
306 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
308 case BFD_RELOC_XTENSA_DIFF8:
309 TRACE ("BFD_RELOC_XTENSA_DIFF8");
310 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
312 case BFD_RELOC_XTENSA_DIFF16:
313 TRACE ("BFD_RELOC_XTENSA_DIFF16");
314 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
316 case BFD_RELOC_XTENSA_DIFF32:
317 TRACE ("BFD_RELOC_XTENSA_DIFF32");
318 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
320 case BFD_RELOC_XTENSA_RTLD:
321 TRACE ("BFD_RELOC_XTENSA_RTLD");
322 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
324 case BFD_RELOC_XTENSA_GLOB_DAT:
325 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
326 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
328 case BFD_RELOC_XTENSA_JMP_SLOT:
329 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
330 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
332 case BFD_RELOC_XTENSA_RELATIVE:
333 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
334 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
336 case BFD_RELOC_XTENSA_PLT:
337 TRACE ("BFD_RELOC_XTENSA_PLT");
338 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
340 case BFD_RELOC_XTENSA_OP0:
341 TRACE ("BFD_RELOC_XTENSA_OP0");
342 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
344 case BFD_RELOC_XTENSA_OP1:
345 TRACE ("BFD_RELOC_XTENSA_OP1");
346 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
348 case BFD_RELOC_XTENSA_OP2:
349 TRACE ("BFD_RELOC_XTENSA_OP2");
350 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
352 case BFD_RELOC_XTENSA_ASM_EXPAND:
353 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
354 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
356 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
357 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
358 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
360 case BFD_RELOC_VTABLE_INHERIT:
361 TRACE ("BFD_RELOC_VTABLE_INHERIT");
362 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
364 case BFD_RELOC_VTABLE_ENTRY:
365 TRACE ("BFD_RELOC_VTABLE_ENTRY");
366 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
369 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
370 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
372 unsigned n = (R_XTENSA_SLOT0_OP +
373 (code - BFD_RELOC_XTENSA_SLOT0_OP));
374 return &elf_howto_table[n];
377 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
378 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
380 unsigned n = (R_XTENSA_SLOT0_ALT +
381 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
382 return &elf_howto_table[n];
393 /* Given an ELF "rela" relocation, find the corresponding howto and record
394 it in the BFD internal arelent representation of the relocation. */
397 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
399 Elf_Internal_Rela *dst)
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
403 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
404 cache_ptr->howto = &elf_howto_table[r_type];
408 /* Functions for the Xtensa ELF linker. */
410 /* The name of the dynamic interpreter. This is put in the .interp
413 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
415 /* The size in bytes of an entry in the procedure linkage table.
416 (This does _not_ include the space for the literals associated with
419 #define PLT_ENTRY_SIZE 16
421 /* For _really_ large PLTs, we may need to alternate between literals
422 and code to keep the literals within the 256K range of the L32R
423 instructions in the code. It's unlikely that anyone would ever need
424 such a big PLT, but an arbitrary limit on the PLT size would be bad.
425 Thus, we split the PLT into chunks. Since there's very little
426 overhead (2 extra literals) for each chunk, the chunk size is kept
427 small so that the code for handling multiple chunks get used and
428 tested regularly. With 254 entries, there are 1K of literals for
429 each chunk, and that seems like a nice round number. */
431 #define PLT_ENTRIES_PER_CHUNK 254
433 /* PLT entries are actually used as stub functions for lazy symbol
434 resolution. Once the symbol is resolved, the stub function is never
435 invoked. Note: the 32-byte frame size used here cannot be changed
436 without a corresponding change in the runtime linker. */
438 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
440 0x6c, 0x10, 0x04, /* entry sp, 32 */
441 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
442 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
443 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
444 0x0a, 0x80, 0x00, /* jx a8 */
448 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
450 0x36, 0x41, 0x00, /* entry sp, 32 */
451 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
452 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
453 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
454 0xa0, 0x08, 0x00, /* jx a8 */
458 /* Xtensa ELF linker hash table. */
460 struct elf_xtensa_link_hash_table
462 struct elf_link_hash_table elf;
464 /* Short-cuts to get to dynamic linker sections. */
471 asection *spltlittbl;
473 /* Total count of PLT relocations seen during check_relocs.
474 The actual PLT code must be split into multiple sections and all
475 the sections have to be created before size_dynamic_sections,
476 where we figure out the exact number of PLT entries that will be
477 needed. It is OK if this count is an overestimate, e.g., some
478 relocations may be removed by GC. */
482 /* Get the Xtensa ELF linker hash table from a link_info structure. */
484 #define elf_xtensa_hash_table(p) \
485 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
487 /* Create an Xtensa ELF linker hash table. */
489 static struct bfd_link_hash_table *
490 elf_xtensa_link_hash_table_create (bfd *abfd)
492 struct elf_xtensa_link_hash_table *ret;
493 bfd_size_type amt = sizeof (struct elf_xtensa_link_hash_table);
495 ret = bfd_malloc (amt);
499 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
500 _bfd_elf_link_hash_newfunc,
501 sizeof (struct elf_link_hash_entry)))
513 ret->spltlittbl = NULL;
515 ret->plt_reloc_count = 0;
517 return &ret->elf.root;
520 static inline bfd_boolean
521 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry *h,
522 struct bfd_link_info *info)
524 /* Check if we should do dynamic things to this symbol. The
525 "ignore_protected" argument need not be set, because Xtensa code
526 does not require special handling of STV_PROTECTED to make function
527 pointer comparisons work properly. The PLT addresses are never
528 used for function pointers. */
530 return _bfd_elf_dynamic_symbol_p (h, info, 0);
535 property_table_compare (const void *ap, const void *bp)
537 const property_table_entry *a = (const property_table_entry *) ap;
538 const property_table_entry *b = (const property_table_entry *) bp;
540 if (a->address == b->address)
542 if (a->size != b->size)
543 return (a->size - b->size);
545 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
546 return ((b->flags & XTENSA_PROP_ALIGN)
547 - (a->flags & XTENSA_PROP_ALIGN));
549 if ((a->flags & XTENSA_PROP_ALIGN)
550 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
551 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
552 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
553 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
555 if ((a->flags & XTENSA_PROP_UNREACHABLE)
556 != (b->flags & XTENSA_PROP_UNREACHABLE))
557 return ((b->flags & XTENSA_PROP_UNREACHABLE)
558 - (a->flags & XTENSA_PROP_UNREACHABLE));
560 return (a->flags - b->flags);
563 return (a->address - b->address);
568 property_table_matches (const void *ap, const void *bp)
570 const property_table_entry *a = (const property_table_entry *) ap;
571 const property_table_entry *b = (const property_table_entry *) bp;
573 /* Check if one entry overlaps with the other. */
574 if ((b->address >= a->address && b->address < (a->address + a->size))
575 || (a->address >= b->address && a->address < (b->address + b->size)))
578 return (a->address - b->address);
582 /* Get the literal table or property table entries for the given
583 section. Sets TABLE_P and returns the number of entries. On
584 error, returns a negative value. */
587 xtensa_read_table_entries (bfd *abfd,
589 property_table_entry **table_p,
590 const char *sec_name,
591 bfd_boolean output_addr)
593 asection *table_section;
594 bfd_size_type table_size = 0;
595 bfd_byte *table_data;
596 property_table_entry *blocks;
597 int blk, block_count;
598 bfd_size_type num_records;
599 Elf_Internal_Rela *internal_relocs;
600 bfd_vma section_addr;
601 flagword predef_flags;
602 bfd_size_type table_entry_size;
605 || !(section->flags & SEC_ALLOC)
606 || (section->flags & SEC_DEBUGGING))
612 table_section = xtensa_get_property_section (section, sec_name);
614 table_size = table_section->size;
622 predef_flags = xtensa_get_property_predef_flags (table_section);
623 table_entry_size = 12;
625 table_entry_size -= 4;
627 num_records = table_size / table_entry_size;
628 table_data = retrieve_contents (abfd, table_section, TRUE);
629 blocks = (property_table_entry *)
630 bfd_malloc (num_records * sizeof (property_table_entry));
634 section_addr = section->output_section->vma + section->output_offset;
636 section_addr = section->vma;
638 /* If the file has not yet been relocated, process the relocations
639 and sort out the table entries that apply to the specified section. */
640 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
641 if (internal_relocs && !table_section->reloc_done)
645 for (i = 0; i < table_section->reloc_count; i++)
647 Elf_Internal_Rela *rel = &internal_relocs[i];
648 unsigned long r_symndx;
650 if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE)
653 BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32);
654 r_symndx = ELF32_R_SYM (rel->r_info);
656 if (get_elf_r_symndx_section (abfd, r_symndx) == section)
658 bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
659 BFD_ASSERT (sym_off == 0);
660 blocks[block_count].address =
661 (section_addr + sym_off + rel->r_addend
662 + bfd_get_32 (abfd, table_data + rel->r_offset));
663 blocks[block_count].size =
664 bfd_get_32 (abfd, table_data + rel->r_offset + 4);
666 blocks[block_count].flags = predef_flags;
668 blocks[block_count].flags =
669 bfd_get_32 (abfd, table_data + rel->r_offset + 8);
676 /* The file has already been relocated and the addresses are
677 already in the table. */
679 bfd_size_type section_limit = bfd_get_section_limit (abfd, section);
681 for (off = 0; off < table_size; off += table_entry_size)
683 bfd_vma address = bfd_get_32 (abfd, table_data + off);
685 if (address >= section_addr
686 && address < section_addr + section_limit)
688 blocks[block_count].address = address;
689 blocks[block_count].size =
690 bfd_get_32 (abfd, table_data + off + 4);
692 blocks[block_count].flags = predef_flags;
694 blocks[block_count].flags =
695 bfd_get_32 (abfd, table_data + off + 8);
701 release_contents (table_section, table_data);
702 release_internal_relocs (table_section, internal_relocs);
706 /* Now sort them into address order for easy reference. */
707 qsort (blocks, block_count, sizeof (property_table_entry),
708 property_table_compare);
710 /* Check that the table contents are valid. Problems may occur,
711 for example, if an unrelocated object file is stripped. */
712 for (blk = 1; blk < block_count; blk++)
714 /* The only circumstance where two entries may legitimately
715 have the same address is when one of them is a zero-size
716 placeholder to mark a place where fill can be inserted.
717 The zero-size entry should come first. */
718 if (blocks[blk - 1].address == blocks[blk].address &&
719 blocks[blk - 1].size != 0)
721 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
723 bfd_set_error (bfd_error_bad_value);
735 static property_table_entry *
736 elf_xtensa_find_property_entry (property_table_entry *property_table,
737 int property_table_size,
740 property_table_entry entry;
741 property_table_entry *rv;
743 if (property_table_size == 0)
746 entry.address = addr;
750 rv = bsearch (&entry, property_table, property_table_size,
751 sizeof (property_table_entry), property_table_matches);
757 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
761 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
768 /* Look through the relocs for a section during the first phase, and
769 calculate needed space in the dynamic reloc sections. */
772 elf_xtensa_check_relocs (bfd *abfd,
773 struct bfd_link_info *info,
775 const Elf_Internal_Rela *relocs)
777 struct elf_xtensa_link_hash_table *htab;
778 Elf_Internal_Shdr *symtab_hdr;
779 struct elf_link_hash_entry **sym_hashes;
780 const Elf_Internal_Rela *rel;
781 const Elf_Internal_Rela *rel_end;
783 if (info->relocatable)
786 htab = elf_xtensa_hash_table (info);
787 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
788 sym_hashes = elf_sym_hashes (abfd);
790 rel_end = relocs + sec->reloc_count;
791 for (rel = relocs; rel < rel_end; rel++)
794 unsigned long r_symndx;
795 struct elf_link_hash_entry *h;
797 r_symndx = ELF32_R_SYM (rel->r_info);
798 r_type = ELF32_R_TYPE (rel->r_info);
800 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
802 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
807 if (r_symndx < symtab_hdr->sh_info)
811 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
812 while (h->root.type == bfd_link_hash_indirect
813 || h->root.type == bfd_link_hash_warning)
814 h = (struct elf_link_hash_entry *) h->root.u.i.link;
823 if ((sec->flags & SEC_ALLOC) != 0)
825 if (h->got.refcount <= 0)
828 h->got.refcount += 1;
833 /* If this relocation is against a local symbol, then it's
834 exactly the same as a normal local GOT entry. */
838 if ((sec->flags & SEC_ALLOC) != 0)
840 if (h->plt.refcount <= 0)
846 h->plt.refcount += 1;
848 /* Keep track of the total PLT relocation count even if we
849 don't yet know whether the dynamic sections will be
851 htab->plt_reloc_count += 1;
853 if (elf_hash_table (info)->dynamic_sections_created)
855 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
862 if ((sec->flags & SEC_ALLOC) != 0)
864 bfd_signed_vma *local_got_refcounts;
866 /* This is a global offset table entry for a local symbol. */
867 local_got_refcounts = elf_local_got_refcounts (abfd);
868 if (local_got_refcounts == NULL)
872 size = symtab_hdr->sh_info;
873 size *= sizeof (bfd_signed_vma);
874 local_got_refcounts =
875 (bfd_signed_vma *) bfd_zalloc (abfd, size);
876 if (local_got_refcounts == NULL)
878 elf_local_got_refcounts (abfd) = local_got_refcounts;
880 local_got_refcounts[r_symndx] += 1;
887 case R_XTENSA_SLOT0_OP:
888 case R_XTENSA_SLOT1_OP:
889 case R_XTENSA_SLOT2_OP:
890 case R_XTENSA_SLOT3_OP:
891 case R_XTENSA_SLOT4_OP:
892 case R_XTENSA_SLOT5_OP:
893 case R_XTENSA_SLOT6_OP:
894 case R_XTENSA_SLOT7_OP:
895 case R_XTENSA_SLOT8_OP:
896 case R_XTENSA_SLOT9_OP:
897 case R_XTENSA_SLOT10_OP:
898 case R_XTENSA_SLOT11_OP:
899 case R_XTENSA_SLOT12_OP:
900 case R_XTENSA_SLOT13_OP:
901 case R_XTENSA_SLOT14_OP:
902 case R_XTENSA_SLOT0_ALT:
903 case R_XTENSA_SLOT1_ALT:
904 case R_XTENSA_SLOT2_ALT:
905 case R_XTENSA_SLOT3_ALT:
906 case R_XTENSA_SLOT4_ALT:
907 case R_XTENSA_SLOT5_ALT:
908 case R_XTENSA_SLOT6_ALT:
909 case R_XTENSA_SLOT7_ALT:
910 case R_XTENSA_SLOT8_ALT:
911 case R_XTENSA_SLOT9_ALT:
912 case R_XTENSA_SLOT10_ALT:
913 case R_XTENSA_SLOT11_ALT:
914 case R_XTENSA_SLOT12_ALT:
915 case R_XTENSA_SLOT13_ALT:
916 case R_XTENSA_SLOT14_ALT:
917 case R_XTENSA_ASM_EXPAND:
918 case R_XTENSA_ASM_SIMPLIFY:
920 case R_XTENSA_DIFF16:
921 case R_XTENSA_DIFF32:
922 /* Nothing to do for these. */
925 case R_XTENSA_GNU_VTINHERIT:
926 /* This relocation describes the C++ object vtable hierarchy.
927 Reconstruct it for later use during GC. */
928 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
932 case R_XTENSA_GNU_VTENTRY:
933 /* This relocation describes which C++ vtable entries are actually
934 used. Record for later use during GC. */
935 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
948 /* Return the section that should be marked against GC for a given
952 elf_xtensa_gc_mark_hook (asection *sec,
953 struct bfd_link_info *info,
954 Elf_Internal_Rela *rel,
955 struct elf_link_hash_entry *h,
956 Elf_Internal_Sym *sym)
959 switch (ELF32_R_TYPE (rel->r_info))
961 case R_XTENSA_GNU_VTINHERIT:
962 case R_XTENSA_GNU_VTENTRY:
966 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
970 /* Update the GOT & PLT entry reference counts
971 for the section being removed. */
974 elf_xtensa_gc_sweep_hook (bfd *abfd,
975 struct bfd_link_info *info ATTRIBUTE_UNUSED,
977 const Elf_Internal_Rela *relocs)
979 Elf_Internal_Shdr *symtab_hdr;
980 struct elf_link_hash_entry **sym_hashes;
981 bfd_signed_vma *local_got_refcounts;
982 const Elf_Internal_Rela *rel, *relend;
984 if ((sec->flags & SEC_ALLOC) == 0)
987 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
988 sym_hashes = elf_sym_hashes (abfd);
989 local_got_refcounts = elf_local_got_refcounts (abfd);
991 relend = relocs + sec->reloc_count;
992 for (rel = relocs; rel < relend; rel++)
994 unsigned long r_symndx;
996 struct elf_link_hash_entry *h = NULL;
998 r_symndx = ELF32_R_SYM (rel->r_info);
999 if (r_symndx >= symtab_hdr->sh_info)
1001 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1002 while (h->root.type == bfd_link_hash_indirect
1003 || h->root.type == bfd_link_hash_warning)
1004 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1007 r_type = ELF32_R_TYPE (rel->r_info);
1013 if (h->got.refcount > 0)
1020 if (h->plt.refcount > 0)
1025 if (local_got_refcounts[r_symndx] > 0)
1026 local_got_refcounts[r_symndx] -= 1;
1038 /* Create all the dynamic sections. */
1041 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1043 struct elf_xtensa_link_hash_table *htab;
1044 flagword flags, noalloc_flags;
1046 htab = elf_xtensa_hash_table (info);
1048 /* First do all the standard stuff. */
1049 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1051 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1052 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1053 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1054 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1056 /* Create any extra PLT sections in case check_relocs has already
1057 been called on all the non-dynamic input files. */
1058 if (! add_extra_plt_sections (info, htab->plt_reloc_count))
1061 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1062 | SEC_LINKER_CREATED | SEC_READONLY);
1063 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1065 /* Mark the ".got.plt" section READONLY. */
1066 if (htab->sgotplt == NULL
1067 || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags))
1070 /* Create ".rela.got". */
1071 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1072 if (htab->srelgot == NULL
1073 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1076 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1077 htab->sgotloc = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1078 if (htab->sgotloc == NULL
1079 || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2))
1082 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1083 htab->spltlittbl = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1085 if (htab->spltlittbl == NULL
1086 || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2))
1094 add_extra_plt_sections (struct bfd_link_info *info, int count)
1096 bfd *dynobj = elf_hash_table (info)->dynobj;
1099 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1100 ".got.plt" sections. */
1101 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1107 /* Stop when we find a section has already been created. */
1108 if (elf_xtensa_get_plt_section (info, chunk))
1111 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1112 | SEC_LINKER_CREATED | SEC_READONLY);
1114 sname = (char *) bfd_malloc (10);
1115 sprintf (sname, ".plt.%u", chunk);
1116 s = bfd_make_section_with_flags (dynobj, sname, flags | SEC_CODE);
1118 || ! bfd_set_section_alignment (dynobj, s, 2))
1121 sname = (char *) bfd_malloc (14);
1122 sprintf (sname, ".got.plt.%u", chunk);
1123 s = bfd_make_section_with_flags (dynobj, sname, flags);
1125 || ! bfd_set_section_alignment (dynobj, s, 2))
1133 /* Adjust a symbol defined by a dynamic object and referenced by a
1134 regular object. The current definition is in some section of the
1135 dynamic object, but we're not including those sections. We have to
1136 change the definition to something the rest of the link can
1140 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1141 struct elf_link_hash_entry *h)
1143 /* If this is a weak symbol, and there is a real definition, the
1144 processor independent code will have arranged for us to see the
1145 real definition first, and we can just use the same value. */
1148 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1149 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1150 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1151 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1155 /* This is a reference to a symbol defined by a dynamic object. The
1156 reference must go through the GOT, so there's no need for COPY relocs,
1164 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry *h, void *arg)
1166 struct bfd_link_info *info;
1167 struct elf_xtensa_link_hash_table *htab;
1168 bfd_boolean is_dynamic;
1170 if (h->root.type == bfd_link_hash_indirect)
1173 if (h->root.type == bfd_link_hash_warning)
1174 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1176 info = (struct bfd_link_info *) arg;
1177 htab = elf_xtensa_hash_table (info);
1179 is_dynamic = elf_xtensa_dynamic_symbol_p (h, info);
1185 /* For shared objects, there's no need for PLT entries for local
1186 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
1187 if (h->plt.refcount > 0)
1189 if (h->got.refcount < 0)
1190 h->got.refcount = 0;
1191 h->got.refcount += h->plt.refcount;
1192 h->plt.refcount = 0;
1197 /* Don't need any dynamic relocations at all. */
1198 h->plt.refcount = 0;
1199 h->got.refcount = 0;
1203 if (h->plt.refcount > 0)
1204 htab->srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1206 if (h->got.refcount > 0)
1207 htab->srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1214 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info)
1216 struct elf_xtensa_link_hash_table *htab;
1219 htab = elf_xtensa_hash_table (info);
1221 for (i = info->input_bfds; i; i = i->link_next)
1223 bfd_signed_vma *local_got_refcounts;
1224 bfd_size_type j, cnt;
1225 Elf_Internal_Shdr *symtab_hdr;
1227 local_got_refcounts = elf_local_got_refcounts (i);
1228 if (!local_got_refcounts)
1231 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1232 cnt = symtab_hdr->sh_info;
1234 for (j = 0; j < cnt; ++j)
1236 if (local_got_refcounts[j] > 0)
1237 htab->srelgot->size += (local_got_refcounts[j]
1238 * sizeof (Elf32_External_Rela));
1244 /* Set the sizes of the dynamic sections. */
1247 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1248 struct bfd_link_info *info)
1250 struct elf_xtensa_link_hash_table *htab;
1252 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1253 bfd_boolean relplt, relgot;
1254 int plt_entries, plt_chunks, chunk;
1259 htab = elf_xtensa_hash_table (info);
1260 dynobj = elf_hash_table (info)->dynobj;
1263 srelgot = htab->srelgot;
1264 srelplt = htab->srelplt;
1266 if (elf_hash_table (info)->dynamic_sections_created)
1268 BFD_ASSERT (htab->srelgot != NULL
1269 && htab->srelplt != NULL
1270 && htab->sgot != NULL
1271 && htab->spltlittbl != NULL
1272 && htab->sgotloc != NULL);
1274 /* Set the contents of the .interp section to the interpreter. */
1275 if (info->executable)
1277 s = bfd_get_section_by_name (dynobj, ".interp");
1280 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1281 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1284 /* Allocate room for one word in ".got". */
1285 htab->sgot->size = 4;
1287 /* Allocate space in ".rela.got" for literals that reference global
1288 symbols and space in ".rela.plt" for literals that have PLT
1290 elf_link_hash_traverse (elf_hash_table (info),
1291 elf_xtensa_allocate_dynrelocs,
1294 /* If we are generating a shared object, we also need space in
1295 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1296 reference local symbols. */
1298 elf_xtensa_allocate_local_got_size (info);
1300 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1301 each PLT entry, we need the PLT code plus a 4-byte literal.
1302 For each chunk of ".plt", we also need two more 4-byte
1303 literals, two corresponding entries in ".rela.got", and an
1304 8-byte entry in ".xt.lit.plt". */
1305 spltlittbl = htab->spltlittbl;
1306 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1308 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1310 /* Iterate over all the PLT chunks, including any extra sections
1311 created earlier because the initial count of PLT relocations
1312 was an overestimate. */
1314 (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL;
1319 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1320 BFD_ASSERT (sgotplt != NULL);
1322 if (chunk < plt_chunks - 1)
1323 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1324 else if (chunk == plt_chunks - 1)
1325 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1329 if (chunk_entries != 0)
1331 sgotplt->size = 4 * (chunk_entries + 2);
1332 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1333 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1334 spltlittbl->size += 8;
1343 /* Allocate space in ".got.loc" to match the total size of all the
1345 sgotloc = htab->sgotloc;
1346 sgotloc->size = spltlittbl->size;
1347 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1349 if (abfd->flags & DYNAMIC)
1351 for (s = abfd->sections; s != NULL; s = s->next)
1353 if (! elf_discarded_section (s)
1354 && xtensa_is_littable_section (s)
1356 sgotloc->size += s->size;
1361 /* Allocate memory for dynamic sections. */
1364 for (s = dynobj->sections; s != NULL; s = s->next)
1368 if ((s->flags & SEC_LINKER_CREATED) == 0)
1371 /* It's OK to base decisions on the section name, because none
1372 of the dynobj section names depend upon the input files. */
1373 name = bfd_get_section_name (dynobj, s);
1375 if (CONST_STRNEQ (name, ".rela"))
1379 if (strcmp (name, ".rela.plt") == 0)
1381 else if (strcmp (name, ".rela.got") == 0)
1384 /* We use the reloc_count field as a counter if we need
1385 to copy relocs into the output file. */
1389 else if (! CONST_STRNEQ (name, ".plt.")
1390 && ! CONST_STRNEQ (name, ".got.plt.")
1391 && strcmp (name, ".got") != 0
1392 && strcmp (name, ".plt") != 0
1393 && strcmp (name, ".got.plt") != 0
1394 && strcmp (name, ".xt.lit.plt") != 0
1395 && strcmp (name, ".got.loc") != 0)
1397 /* It's not one of our sections, so don't allocate space. */
1403 /* If we don't need this section, strip it from the output
1404 file. We must create the ".plt*" and ".got.plt*"
1405 sections in create_dynamic_sections and/or check_relocs
1406 based on a conservative estimate of the PLT relocation
1407 count, because the sections must be created before the
1408 linker maps input sections to output sections. The
1409 linker does that before size_dynamic_sections, where we
1410 compute the exact size of the PLT, so there may be more
1411 of these sections than are actually needed. */
1412 s->flags |= SEC_EXCLUDE;
1414 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1416 /* Allocate memory for the section contents. */
1417 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1418 if (s->contents == NULL)
1423 if (elf_hash_table (info)->dynamic_sections_created)
1425 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1426 known until finish_dynamic_sections, but we need to get the relocs
1427 in place before they are sorted. */
1428 for (chunk = 0; chunk < plt_chunks; chunk++)
1430 Elf_Internal_Rela irela;
1434 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1437 loc = (srelgot->contents
1438 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1439 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1440 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1441 loc + sizeof (Elf32_External_Rela));
1442 srelgot->reloc_count += 2;
1445 /* Add some entries to the .dynamic section. We fill in the
1446 values later, in elf_xtensa_finish_dynamic_sections, but we
1447 must add the entries now so that we get the correct size for
1448 the .dynamic section. The DT_DEBUG entry is filled in by the
1449 dynamic linker and used by the debugger. */
1450 #define add_dynamic_entry(TAG, VAL) \
1451 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1453 if (info->executable)
1455 if (!add_dynamic_entry (DT_DEBUG, 0))
1461 if (!add_dynamic_entry (DT_PLTGOT, 0)
1462 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1463 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1464 || !add_dynamic_entry (DT_JMPREL, 0))
1470 if (!add_dynamic_entry (DT_RELA, 0)
1471 || !add_dynamic_entry (DT_RELASZ, 0)
1472 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1476 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1477 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1480 #undef add_dynamic_entry
1486 /* Perform the specified relocation. The instruction at (contents + address)
1487 is modified to set one operand to represent the value in "relocation". The
1488 operand position is determined by the relocation type recorded in the
1491 #define CALL_SEGMENT_BITS (30)
1492 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1494 static bfd_reloc_status_type
1495 elf_xtensa_do_reloc (reloc_howto_type *howto,
1497 asection *input_section,
1501 bfd_boolean is_weak_undef,
1502 char **error_message)
1505 xtensa_opcode opcode;
1506 xtensa_isa isa = xtensa_default_isa;
1507 static xtensa_insnbuf ibuff = NULL;
1508 static xtensa_insnbuf sbuff = NULL;
1509 bfd_vma self_address = 0;
1510 bfd_size_type input_size;
1516 ibuff = xtensa_insnbuf_alloc (isa);
1517 sbuff = xtensa_insnbuf_alloc (isa);
1520 input_size = bfd_get_section_limit (abfd, input_section);
1522 switch (howto->type)
1525 case R_XTENSA_DIFF8:
1526 case R_XTENSA_DIFF16:
1527 case R_XTENSA_DIFF32:
1528 return bfd_reloc_ok;
1530 case R_XTENSA_ASM_EXPAND:
1533 /* Check for windowed CALL across a 1GB boundary. */
1534 xtensa_opcode opcode =
1535 get_expanded_call_opcode (contents + address,
1536 input_size - address, 0);
1537 if (is_windowed_call_opcode (opcode))
1539 self_address = (input_section->output_section->vma
1540 + input_section->output_offset
1542 if ((self_address >> CALL_SEGMENT_BITS)
1543 != (relocation >> CALL_SEGMENT_BITS))
1545 *error_message = "windowed longcall crosses 1GB boundary; "
1547 return bfd_reloc_dangerous;
1551 return bfd_reloc_ok;
1553 case R_XTENSA_ASM_SIMPLIFY:
1555 /* Convert the L32R/CALLX to CALL. */
1556 bfd_reloc_status_type retval =
1557 elf_xtensa_do_asm_simplify (contents, address, input_size,
1559 if (retval != bfd_reloc_ok)
1560 return bfd_reloc_dangerous;
1562 /* The CALL needs to be relocated. Continue below for that part. */
1564 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1572 x = bfd_get_32 (abfd, contents + address);
1574 bfd_put_32 (abfd, x, contents + address);
1576 return bfd_reloc_ok;
1579 /* Only instruction slot-specific relocations handled below.... */
1580 slot = get_relocation_slot (howto->type);
1581 if (slot == XTENSA_UNDEFINED)
1583 *error_message = "unexpected relocation";
1584 return bfd_reloc_dangerous;
1587 /* Read the instruction into a buffer and decode the opcode. */
1588 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1589 input_size - address);
1590 fmt = xtensa_format_decode (isa, ibuff);
1591 if (fmt == XTENSA_UNDEFINED)
1593 *error_message = "cannot decode instruction format";
1594 return bfd_reloc_dangerous;
1597 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1599 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1600 if (opcode == XTENSA_UNDEFINED)
1602 *error_message = "cannot decode instruction opcode";
1603 return bfd_reloc_dangerous;
1606 /* Check for opcode-specific "alternate" relocations. */
1607 if (is_alt_relocation (howto->type))
1609 if (opcode == get_l32r_opcode ())
1611 /* Handle the special-case of non-PC-relative L32R instructions. */
1612 bfd *output_bfd = input_section->output_section->owner;
1613 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1616 *error_message = "relocation references missing .lit4 section";
1617 return bfd_reloc_dangerous;
1619 self_address = ((lit4_sec->vma & ~0xfff)
1620 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1621 newval = relocation;
1624 else if (opcode == get_const16_opcode ())
1626 /* ALT used for high 16 bits. */
1627 newval = relocation >> 16;
1632 /* No other "alternate" relocations currently defined. */
1633 *error_message = "unexpected relocation";
1634 return bfd_reloc_dangerous;
1637 else /* Not an "alternate" relocation.... */
1639 if (opcode == get_const16_opcode ())
1641 newval = relocation & 0xffff;
1646 /* ...normal PC-relative relocation.... */
1648 /* Determine which operand is being relocated. */
1649 opnd = get_relocation_opnd (opcode, howto->type);
1650 if (opnd == XTENSA_UNDEFINED)
1652 *error_message = "unexpected relocation";
1653 return bfd_reloc_dangerous;
1656 if (!howto->pc_relative)
1658 *error_message = "expected PC-relative relocation";
1659 return bfd_reloc_dangerous;
1662 /* Calculate the PC address for this instruction. */
1663 self_address = (input_section->output_section->vma
1664 + input_section->output_offset
1667 newval = relocation;
1671 /* Apply the relocation. */
1672 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1673 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1674 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1677 const char *opname = xtensa_opcode_name (isa, opcode);
1680 msg = "cannot encode";
1681 if (is_direct_call_opcode (opcode))
1683 if ((relocation & 0x3) != 0)
1684 msg = "misaligned call target";
1686 msg = "call target out of range";
1688 else if (opcode == get_l32r_opcode ())
1690 if ((relocation & 0x3) != 0)
1691 msg = "misaligned literal target";
1692 else if (is_alt_relocation (howto->type))
1693 msg = "literal target out of range (too many literals)";
1694 else if (self_address > relocation)
1695 msg = "literal target out of range (try using text-section-literals)";
1697 msg = "literal placed after use";
1700 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1701 return bfd_reloc_dangerous;
1704 /* Check for calls across 1GB boundaries. */
1705 if (is_direct_call_opcode (opcode)
1706 && is_windowed_call_opcode (opcode))
1708 if ((self_address >> CALL_SEGMENT_BITS)
1709 != (relocation >> CALL_SEGMENT_BITS))
1712 "windowed call crosses 1GB boundary; return may fail";
1713 return bfd_reloc_dangerous;
1717 /* Write the modified instruction back out of the buffer. */
1718 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1719 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1720 input_size - address);
1721 return bfd_reloc_ok;
1726 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1728 /* To reduce the size of the memory leak,
1729 we only use a single message buffer. */
1730 static bfd_size_type alloc_size = 0;
1731 static char *message = NULL;
1732 bfd_size_type orig_len, len = 0;
1733 bfd_boolean is_append;
1735 VA_OPEN (ap, arglen);
1736 VA_FIXEDARG (ap, const char *, origmsg);
1738 is_append = (origmsg == message);
1740 orig_len = strlen (origmsg);
1741 len = orig_len + strlen (fmt) + arglen + 20;
1742 if (len > alloc_size)
1744 message = (char *) bfd_realloc (message, len);
1748 memcpy (message, origmsg, orig_len);
1749 vsprintf (message + orig_len, fmt, ap);
1755 /* This function is registered as the "special_function" in the
1756 Xtensa howto for handling simplify operations.
1757 bfd_perform_relocation / bfd_install_relocation use it to
1758 perform (install) the specified relocation. Since this replaces the code
1759 in bfd_perform_relocation, it is basically an Xtensa-specific,
1760 stripped-down version of bfd_perform_relocation. */
1762 static bfd_reloc_status_type
1763 bfd_elf_xtensa_reloc (bfd *abfd,
1764 arelent *reloc_entry,
1767 asection *input_section,
1769 char **error_message)
1772 bfd_reloc_status_type flag;
1773 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1774 bfd_vma output_base = 0;
1775 reloc_howto_type *howto = reloc_entry->howto;
1776 asection *reloc_target_output_section;
1777 bfd_boolean is_weak_undef;
1779 if (!xtensa_default_isa)
1780 xtensa_default_isa = xtensa_isa_init (0, 0);
1782 /* ELF relocs are against symbols. If we are producing relocatable
1783 output, and the reloc is against an external symbol, the resulting
1784 reloc will also be against the same symbol. In such a case, we
1785 don't want to change anything about the way the reloc is handled,
1786 since it will all be done at final link time. This test is similar
1787 to what bfd_elf_generic_reloc does except that it lets relocs with
1788 howto->partial_inplace go through even if the addend is non-zero.
1789 (The real problem is that partial_inplace is set for XTENSA_32
1790 relocs to begin with, but that's a long story and there's little we
1791 can do about it now....) */
1793 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1795 reloc_entry->address += input_section->output_offset;
1796 return bfd_reloc_ok;
1799 /* Is the address of the relocation really within the section? */
1800 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1801 return bfd_reloc_outofrange;
1803 /* Work out which section the relocation is targeted at and the
1804 initial relocation command value. */
1806 /* Get symbol value. (Common symbols are special.) */
1807 if (bfd_is_com_section (symbol->section))
1810 relocation = symbol->value;
1812 reloc_target_output_section = symbol->section->output_section;
1814 /* Convert input-section-relative symbol value to absolute. */
1815 if ((output_bfd && !howto->partial_inplace)
1816 || reloc_target_output_section == NULL)
1819 output_base = reloc_target_output_section->vma;
1821 relocation += output_base + symbol->section->output_offset;
1823 /* Add in supplied addend. */
1824 relocation += reloc_entry->addend;
1826 /* Here the variable relocation holds the final address of the
1827 symbol we are relocating against, plus any addend. */
1830 if (!howto->partial_inplace)
1832 /* This is a partial relocation, and we want to apply the relocation
1833 to the reloc entry rather than the raw data. Everything except
1834 relocations against section symbols has already been handled
1837 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1838 reloc_entry->addend = relocation;
1839 reloc_entry->address += input_section->output_offset;
1840 return bfd_reloc_ok;
1844 reloc_entry->address += input_section->output_offset;
1845 reloc_entry->addend = 0;
1849 is_weak_undef = (bfd_is_und_section (symbol->section)
1850 && (symbol->flags & BSF_WEAK) != 0);
1851 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1852 (bfd_byte *) data, (bfd_vma) octets,
1853 is_weak_undef, error_message);
1855 if (flag == bfd_reloc_dangerous)
1857 /* Add the symbol name to the error message. */
1858 if (! *error_message)
1859 *error_message = "";
1860 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1861 strlen (symbol->name) + 17,
1863 (unsigned long) reloc_entry->addend);
1870 /* Set up an entry in the procedure linkage table. */
1873 elf_xtensa_create_plt_entry (struct bfd_link_info *info,
1875 unsigned reloc_index)
1877 asection *splt, *sgotplt;
1878 bfd_vma plt_base, got_base;
1879 bfd_vma code_offset, lit_offset;
1882 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1883 splt = elf_xtensa_get_plt_section (info, chunk);
1884 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
1885 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1887 plt_base = splt->output_section->vma + splt->output_offset;
1888 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1890 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1891 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1893 /* Fill in the literal entry. This is the offset of the dynamic
1894 relocation entry. */
1895 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1896 sgotplt->contents + lit_offset);
1898 /* Fill in the entry in the procedure linkage table. */
1899 memcpy (splt->contents + code_offset,
1900 (bfd_big_endian (output_bfd)
1901 ? elf_xtensa_be_plt_entry
1902 : elf_xtensa_le_plt_entry),
1904 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1905 plt_base + code_offset + 3),
1906 splt->contents + code_offset + 4);
1907 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1908 plt_base + code_offset + 6),
1909 splt->contents + code_offset + 7);
1910 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1911 plt_base + code_offset + 9),
1912 splt->contents + code_offset + 10);
1914 return plt_base + code_offset;
1918 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1919 both relocatable and final links. */
1922 elf_xtensa_relocate_section (bfd *output_bfd,
1923 struct bfd_link_info *info,
1925 asection *input_section,
1927 Elf_Internal_Rela *relocs,
1928 Elf_Internal_Sym *local_syms,
1929 asection **local_sections)
1931 struct elf_xtensa_link_hash_table *htab;
1932 Elf_Internal_Shdr *symtab_hdr;
1933 Elf_Internal_Rela *rel;
1934 Elf_Internal_Rela *relend;
1935 struct elf_link_hash_entry **sym_hashes;
1936 property_table_entry *lit_table = 0;
1938 char *error_message = NULL;
1939 bfd_size_type input_size;
1941 if (!xtensa_default_isa)
1942 xtensa_default_isa = xtensa_isa_init (0, 0);
1944 htab = elf_xtensa_hash_table (info);
1945 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1946 sym_hashes = elf_sym_hashes (input_bfd);
1948 if (elf_hash_table (info)->dynamic_sections_created)
1950 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
1951 &lit_table, XTENSA_LIT_SEC_NAME,
1957 input_size = bfd_get_section_limit (input_bfd, input_section);
1960 relend = relocs + input_section->reloc_count;
1961 for (; rel < relend; rel++)
1964 reloc_howto_type *howto;
1965 unsigned long r_symndx;
1966 struct elf_link_hash_entry *h;
1967 Elf_Internal_Sym *sym;
1970 bfd_reloc_status_type r;
1971 bfd_boolean is_weak_undef;
1972 bfd_boolean unresolved_reloc;
1975 r_type = ELF32_R_TYPE (rel->r_info);
1976 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
1977 || r_type == (int) R_XTENSA_GNU_VTENTRY)
1980 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
1982 bfd_set_error (bfd_error_bad_value);
1985 howto = &elf_howto_table[r_type];
1987 r_symndx = ELF32_R_SYM (rel->r_info);
1989 if (info->relocatable)
1991 /* This is a relocatable link.
1992 1) If the reloc is against a section symbol, adjust
1993 according to the output section.
1994 2) If there is a new target for this relocation,
1995 the new target will be in the same output section.
1996 We adjust the relocation by the output section
1999 if (relaxing_section)
2001 /* Check if this references a section in another input file. */
2002 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2005 r_type = ELF32_R_TYPE (rel->r_info);
2008 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2010 char *error_message = NULL;
2011 /* Convert ASM_SIMPLIFY into the simpler relocation
2012 so that they never escape a relaxing link. */
2013 r = contract_asm_expansion (contents, input_size, rel,
2015 if (r != bfd_reloc_ok)
2017 if (!((*info->callbacks->reloc_dangerous)
2018 (info, error_message, input_bfd, input_section,
2022 r_type = ELF32_R_TYPE (rel->r_info);
2025 /* This is a relocatable link, so we don't have to change
2026 anything unless the reloc is against a section symbol,
2027 in which case we have to adjust according to where the
2028 section symbol winds up in the output section. */
2029 if (r_symndx < symtab_hdr->sh_info)
2031 sym = local_syms + r_symndx;
2032 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2034 sec = local_sections[r_symndx];
2035 rel->r_addend += sec->output_offset + sym->st_value;
2039 /* If there is an addend with a partial_inplace howto,
2040 then move the addend to the contents. This is a hack
2041 to work around problems with DWARF in relocatable links
2042 with some previous version of BFD. Now we can't easily get
2043 rid of the hack without breaking backward compatibility.... */
2046 howto = &elf_howto_table[r_type];
2047 if (howto->partial_inplace)
2049 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2050 rel->r_addend, contents,
2051 rel->r_offset, FALSE,
2053 if (r != bfd_reloc_ok)
2055 if (!((*info->callbacks->reloc_dangerous)
2056 (info, error_message, input_bfd, input_section,
2064 /* Done with work for relocatable link; continue with next reloc. */
2068 /* This is a final link. */
2073 is_weak_undef = FALSE;
2074 unresolved_reloc = FALSE;
2077 if (howto->partial_inplace)
2079 /* Because R_XTENSA_32 was made partial_inplace to fix some
2080 problems with DWARF info in partial links, there may be
2081 an addend stored in the contents. Take it out of there
2082 and move it back into the addend field of the reloc. */
2083 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2084 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2087 if (r_symndx < symtab_hdr->sh_info)
2089 sym = local_syms + r_symndx;
2090 sec = local_sections[r_symndx];
2091 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2095 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2096 r_symndx, symtab_hdr, sym_hashes,
2098 unresolved_reloc, warned);
2101 && !unresolved_reloc
2102 && h->root.type == bfd_link_hash_undefweak)
2103 is_weak_undef = TRUE;
2106 if (relaxing_section)
2108 /* Check if this references a section in another input file. */
2109 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2112 /* Update some already cached values. */
2113 r_type = ELF32_R_TYPE (rel->r_info);
2114 howto = &elf_howto_table[r_type];
2117 /* Sanity check the address. */
2118 if (rel->r_offset >= input_size
2119 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2121 (*_bfd_error_handler)
2122 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2123 input_bfd, input_section, rel->r_offset, input_size);
2124 bfd_set_error (bfd_error_bad_value);
2128 /* Generate dynamic relocations. */
2129 if (elf_hash_table (info)->dynamic_sections_created)
2131 bfd_boolean dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
2133 if (dynamic_symbol && is_operand_relocation (r_type))
2135 /* This is an error. The symbol's real value won't be known
2136 until runtime and it's likely to be out of range anyway. */
2137 const char *name = h->root.root.string;
2138 error_message = vsprint_msg ("invalid relocation for dynamic "
2140 strlen (name) + 2, name);
2141 if (!((*info->callbacks->reloc_dangerous)
2142 (info, error_message, input_bfd, input_section,
2146 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2147 && (input_section->flags & SEC_ALLOC) != 0
2148 && (dynamic_symbol || info->shared))
2150 Elf_Internal_Rela outrel;
2154 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2155 srel = htab->srelplt;
2157 srel = htab->srelgot;
2159 BFD_ASSERT (srel != NULL);
2162 _bfd_elf_section_offset (output_bfd, info,
2163 input_section, rel->r_offset);
2165 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2166 memset (&outrel, 0, sizeof outrel);
2169 outrel.r_offset += (input_section->output_section->vma
2170 + input_section->output_offset);
2172 /* Complain if the relocation is in a read-only section
2173 and not in a literal pool. */
2174 if ((input_section->flags & SEC_READONLY) != 0
2175 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2179 _("dynamic relocation in read-only section");
2180 if (!((*info->callbacks->reloc_dangerous)
2181 (info, error_message, input_bfd, input_section,
2188 outrel.r_addend = rel->r_addend;
2191 if (r_type == R_XTENSA_32)
2194 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2197 else /* r_type == R_XTENSA_PLT */
2200 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2202 /* Create the PLT entry and set the initial
2203 contents of the literal entry to the address of
2206 elf_xtensa_create_plt_entry (info, output_bfd,
2209 unresolved_reloc = FALSE;
2213 /* Generate a RELATIVE relocation. */
2214 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2215 outrel.r_addend = 0;
2219 loc = (srel->contents
2220 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2221 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2222 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2227 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2228 because such sections are not SEC_ALLOC and thus ld.so will
2229 not process them. */
2230 if (unresolved_reloc
2231 && !((input_section->flags & SEC_DEBUGGING) != 0
2234 (*_bfd_error_handler)
2235 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2238 (long) rel->r_offset,
2240 h->root.root.string);
2246 /* r_symndx will be zero only for relocs against symbols from
2247 removed linkonce sections, or sections discarded by a linker
2248 script. For these relocs, we just want the section contents
2249 zeroed. Avoid any special processing. */
2250 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2254 /* There's no point in calling bfd_perform_relocation here.
2255 Just go directly to our "special function". */
2256 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2257 relocation + rel->r_addend,
2258 contents, rel->r_offset, is_weak_undef,
2261 if (r != bfd_reloc_ok && !warned)
2265 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2266 BFD_ASSERT (error_message != NULL);
2269 name = h->root.root.string;
2272 name = bfd_elf_string_from_elf_section
2273 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2274 if (name && *name == '\0')
2275 name = bfd_section_name (input_bfd, sec);
2279 if (rel->r_addend == 0)
2280 error_message = vsprint_msg (error_message, ": %s",
2281 strlen (name) + 2, name);
2283 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2285 name, (int)rel->r_addend);
2288 if (!((*info->callbacks->reloc_dangerous)
2289 (info, error_message, input_bfd, input_section,
2298 input_section->reloc_done = TRUE;
2304 /* Finish up dynamic symbol handling. There's not much to do here since
2305 the PLT and GOT entries are all set up by relocate_section. */
2308 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2309 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2310 struct elf_link_hash_entry *h,
2311 Elf_Internal_Sym *sym)
2313 if (h->needs_plt && !h->def_regular)
2315 /* Mark the symbol as undefined, rather than as defined in
2316 the .plt section. Leave the value alone. */
2317 sym->st_shndx = SHN_UNDEF;
2318 /* If the symbol is weak, we do need to clear the value.
2319 Otherwise, the PLT entry would provide a definition for
2320 the symbol even if the symbol wasn't defined anywhere,
2321 and so the symbol would never be NULL. */
2322 if (!h->ref_regular_nonweak)
2326 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2327 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2328 || h == elf_hash_table (info)->hgot)
2329 sym->st_shndx = SHN_ABS;
2335 /* Combine adjacent literal table entries in the output. Adjacent
2336 entries within each input section may have been removed during
2337 relaxation, but we repeat the process here, even though it's too late
2338 to shrink the output section, because it's important to minimize the
2339 number of literal table entries to reduce the start-up work for the
2340 runtime linker. Returns the number of remaining table entries or -1
2344 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2349 property_table_entry *table;
2350 bfd_size_type section_size, sgotloc_size;
2354 section_size = sxtlit->size;
2355 BFD_ASSERT (section_size % 8 == 0);
2356 num = section_size / 8;
2358 sgotloc_size = sgotloc->size;
2359 if (sgotloc_size != section_size)
2361 (*_bfd_error_handler)
2362 (_("internal inconsistency in size of .got.loc section"));
2366 table = bfd_malloc (num * sizeof (property_table_entry));
2370 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2371 propagates to the output section, where it doesn't really apply and
2372 where it breaks the following call to bfd_malloc_and_get_section. */
2373 sxtlit->flags &= ~SEC_IN_MEMORY;
2375 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2383 /* There should never be any relocations left at this point, so this
2384 is quite a bit easier than what is done during relaxation. */
2386 /* Copy the raw contents into a property table array and sort it. */
2388 for (n = 0; n < num; n++)
2390 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2391 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2394 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2396 for (n = 0; n < num; n++)
2398 bfd_boolean remove = FALSE;
2400 if (table[n].size == 0)
2403 (table[n-1].address + table[n-1].size == table[n].address))
2405 table[n-1].size += table[n].size;
2411 for (m = n; m < num - 1; m++)
2413 table[m].address = table[m+1].address;
2414 table[m].size = table[m+1].size;
2422 /* Copy the data back to the raw contents. */
2424 for (n = 0; n < num; n++)
2426 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2427 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2431 /* Clear the removed bytes. */
2432 if ((bfd_size_type) (num * 8) < section_size)
2433 memset (&contents[num * 8], 0, section_size - num * 8);
2435 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2439 /* Copy the contents to ".got.loc". */
2440 memcpy (sgotloc->contents, contents, section_size);
2448 /* Finish up the dynamic sections. */
2451 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2452 struct bfd_link_info *info)
2454 struct elf_xtensa_link_hash_table *htab;
2456 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2457 Elf32_External_Dyn *dyncon, *dynconend;
2458 int num_xtlit_entries;
2460 if (! elf_hash_table (info)->dynamic_sections_created)
2463 htab = elf_xtensa_hash_table (info);
2464 dynobj = elf_hash_table (info)->dynobj;
2465 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2466 BFD_ASSERT (sdyn != NULL);
2468 /* Set the first entry in the global offset table to the address of
2469 the dynamic section. */
2473 BFD_ASSERT (sgot->size == 4);
2475 bfd_put_32 (output_bfd, 0, sgot->contents);
2477 bfd_put_32 (output_bfd,
2478 sdyn->output_section->vma + sdyn->output_offset,
2482 srelplt = htab->srelplt;
2483 if (srelplt && srelplt->size != 0)
2485 asection *sgotplt, *srelgot, *spltlittbl;
2486 int chunk, plt_chunks, plt_entries;
2487 Elf_Internal_Rela irela;
2489 unsigned rtld_reloc;
2491 srelgot = htab->srelgot;
2492 spltlittbl = htab->spltlittbl;
2493 BFD_ASSERT (srelgot != NULL && spltlittbl != NULL);
2495 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2496 of them follow immediately after.... */
2497 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2499 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2500 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2501 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2504 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2506 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2508 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2510 for (chunk = 0; chunk < plt_chunks; chunk++)
2512 int chunk_entries = 0;
2514 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
2515 BFD_ASSERT (sgotplt != NULL);
2517 /* Emit special RTLD relocations for the first two entries in
2518 each chunk of the .got.plt section. */
2520 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2521 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2522 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2523 irela.r_offset = (sgotplt->output_section->vma
2524 + sgotplt->output_offset);
2525 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2526 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2528 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2530 /* Next literal immediately follows the first. */
2531 loc += sizeof (Elf32_External_Rela);
2532 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2533 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2534 irela.r_offset = (sgotplt->output_section->vma
2535 + sgotplt->output_offset + 4);
2536 /* Tell rtld to set value to object's link map. */
2538 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2540 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2542 /* Fill in the literal table. */
2543 if (chunk < plt_chunks - 1)
2544 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2546 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2548 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2549 bfd_put_32 (output_bfd,
2550 sgotplt->output_section->vma + sgotplt->output_offset,
2551 spltlittbl->contents + (chunk * 8) + 0);
2552 bfd_put_32 (output_bfd,
2553 8 + (chunk_entries * 4),
2554 spltlittbl->contents + (chunk * 8) + 4);
2557 /* All the dynamic relocations have been emitted at this point.
2558 Make sure the relocation sections are the correct size. */
2559 if (srelgot->size != (sizeof (Elf32_External_Rela)
2560 * srelgot->reloc_count)
2561 || srelplt->size != (sizeof (Elf32_External_Rela)
2562 * srelplt->reloc_count))
2565 /* The .xt.lit.plt section has just been modified. This must
2566 happen before the code below which combines adjacent literal
2567 table entries, and the .xt.lit.plt contents have to be forced to
2569 if (! bfd_set_section_contents (output_bfd,
2570 spltlittbl->output_section,
2571 spltlittbl->contents,
2572 spltlittbl->output_offset,
2575 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2576 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2579 /* Combine adjacent literal table entries. */
2580 BFD_ASSERT (! info->relocatable);
2581 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2582 sgotloc = htab->sgotloc;
2583 BFD_ASSERT (sxtlit && sgotloc);
2585 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2586 if (num_xtlit_entries < 0)
2589 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2590 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2591 for (; dyncon < dynconend; dyncon++)
2593 Elf_Internal_Dyn dyn;
2595 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2602 case DT_XTENSA_GOT_LOC_SZ:
2603 dyn.d_un.d_val = num_xtlit_entries;
2606 case DT_XTENSA_GOT_LOC_OFF:
2607 dyn.d_un.d_ptr = htab->sgotloc->vma;
2611 dyn.d_un.d_ptr = htab->sgot->vma;
2615 dyn.d_un.d_ptr = htab->srelplt->vma;
2619 dyn.d_un.d_val = htab->srelplt->size;
2623 /* Adjust RELASZ to not include JMPREL. This matches what
2624 glibc expects and what is done for several other ELF
2625 targets (e.g., i386, alpha), but the "correct" behavior
2626 seems to be unresolved. Since the linker script arranges
2627 for .rela.plt to follow all other relocation sections, we
2628 don't have to worry about changing the DT_RELA entry. */
2630 dyn.d_un.d_val -= htab->srelplt->size;
2634 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2641 /* Functions for dealing with the e_flags field. */
2643 /* Merge backend specific data from an object file to the output
2644 object file when linking. */
2647 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2649 unsigned out_mach, in_mach;
2650 flagword out_flag, in_flag;
2652 /* Check if we have the same endianess. */
2653 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2656 /* Don't even pretend to support mixed-format linking. */
2657 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2658 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2661 out_flag = elf_elfheader (obfd)->e_flags;
2662 in_flag = elf_elfheader (ibfd)->e_flags;
2664 out_mach = out_flag & EF_XTENSA_MACH;
2665 in_mach = in_flag & EF_XTENSA_MACH;
2666 if (out_mach != in_mach)
2668 (*_bfd_error_handler)
2669 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2670 ibfd, out_mach, in_mach);
2671 bfd_set_error (bfd_error_wrong_format);
2675 if (! elf_flags_init (obfd))
2677 elf_flags_init (obfd) = TRUE;
2678 elf_elfheader (obfd)->e_flags = in_flag;
2680 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2681 && bfd_get_arch_info (obfd)->the_default)
2682 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2683 bfd_get_mach (ibfd));
2688 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2689 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2691 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2692 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2699 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2701 BFD_ASSERT (!elf_flags_init (abfd)
2702 || elf_elfheader (abfd)->e_flags == flags);
2704 elf_elfheader (abfd)->e_flags |= flags;
2705 elf_flags_init (abfd) = TRUE;
2712 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2714 FILE *f = (FILE *) farg;
2715 flagword e_flags = elf_elfheader (abfd)->e_flags;
2717 fprintf (f, "\nXtensa header:\n");
2718 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2719 fprintf (f, "\nMachine = Base\n");
2721 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2723 fprintf (f, "Insn tables = %s\n",
2724 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2726 fprintf (f, "Literal tables = %s\n",
2727 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2729 return _bfd_elf_print_private_bfd_data (abfd, farg);
2733 /* Set the right machine number for an Xtensa ELF file. */
2736 elf_xtensa_object_p (bfd *abfd)
2739 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2744 mach = bfd_mach_xtensa;
2750 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2755 /* The final processing done just before writing out an Xtensa ELF object
2756 file. This gets the Xtensa architecture right based on the machine
2760 elf_xtensa_final_write_processing (bfd *abfd,
2761 bfd_boolean linker ATTRIBUTE_UNUSED)
2766 switch (mach = bfd_get_mach (abfd))
2768 case bfd_mach_xtensa:
2769 val = E_XTENSA_MACH;
2775 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2776 elf_elfheader (abfd)->e_flags |= val;
2780 static enum elf_reloc_type_class
2781 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2783 switch ((int) ELF32_R_TYPE (rela->r_info))
2785 case R_XTENSA_RELATIVE:
2786 return reloc_class_relative;
2787 case R_XTENSA_JMP_SLOT:
2788 return reloc_class_plt;
2790 return reloc_class_normal;
2796 elf_xtensa_discard_info_for_section (bfd *abfd,
2797 struct elf_reloc_cookie *cookie,
2798 struct bfd_link_info *info,
2802 bfd_vma section_size;
2803 bfd_vma offset, actual_offset;
2804 size_t removed_bytes = 0;
2806 section_size = sec->size;
2807 if (section_size == 0 || section_size % 8 != 0)
2810 if (sec->output_section
2811 && bfd_is_abs_section (sec->output_section))
2814 contents = retrieve_contents (abfd, sec, info->keep_memory);
2818 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2821 release_contents (sec, contents);
2825 cookie->rel = cookie->rels;
2826 cookie->relend = cookie->rels + sec->reloc_count;
2828 for (offset = 0; offset < section_size; offset += 8)
2830 actual_offset = offset - removed_bytes;
2832 /* The ...symbol_deleted_p function will skip over relocs but it
2833 won't adjust their offsets, so do that here. */
2834 while (cookie->rel < cookie->relend
2835 && cookie->rel->r_offset < offset)
2837 cookie->rel->r_offset -= removed_bytes;
2841 while (cookie->rel < cookie->relend
2842 && cookie->rel->r_offset == offset)
2844 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2846 /* Remove the table entry. (If the reloc type is NONE, then
2847 the entry has already been merged with another and deleted
2848 during relaxation.) */
2849 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2851 /* Shift the contents up. */
2852 if (offset + 8 < section_size)
2853 memmove (&contents[actual_offset],
2854 &contents[actual_offset+8],
2855 section_size - offset - 8);
2859 /* Remove this relocation. */
2860 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2863 /* Adjust the relocation offset for previous removals. This
2864 should not be done before calling ...symbol_deleted_p
2865 because it might mess up the offset comparisons there.
2866 Make sure the offset doesn't underflow in the case where
2867 the first entry is removed. */
2868 if (cookie->rel->r_offset >= removed_bytes)
2869 cookie->rel->r_offset -= removed_bytes;
2871 cookie->rel->r_offset = 0;
2877 if (removed_bytes != 0)
2879 /* Adjust any remaining relocs (shouldn't be any). */
2880 for (; cookie->rel < cookie->relend; cookie->rel++)
2882 if (cookie->rel->r_offset >= removed_bytes)
2883 cookie->rel->r_offset -= removed_bytes;
2885 cookie->rel->r_offset = 0;
2888 /* Clear the removed bytes. */
2889 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2891 pin_contents (sec, contents);
2892 pin_internal_relocs (sec, cookie->rels);
2895 sec->size = section_size - removed_bytes;
2897 if (xtensa_is_littable_section (sec))
2899 asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc;
2901 sgotloc->size -= removed_bytes;
2906 release_contents (sec, contents);
2907 release_internal_relocs (sec, cookie->rels);
2910 return (removed_bytes != 0);
2915 elf_xtensa_discard_info (bfd *abfd,
2916 struct elf_reloc_cookie *cookie,
2917 struct bfd_link_info *info)
2920 bfd_boolean changed = FALSE;
2922 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2924 if (xtensa_is_property_section (sec))
2926 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
2936 elf_xtensa_ignore_discarded_relocs (asection *sec)
2938 return xtensa_is_property_section (sec);
2943 elf_xtensa_action_discarded (asection *sec)
2945 if (strcmp (".xt_except_table", sec->name) == 0)
2948 if (strcmp (".xt_except_desc", sec->name) == 0)
2951 return _bfd_elf_default_action_discarded (sec);
2955 /* Support for core dump NOTE sections. */
2958 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2963 /* The size for Xtensa is variable, so don't try to recognize the format
2964 based on the size. Just assume this is GNU/Linux. */
2967 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2970 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
2974 size = note->descsz - offset - 4;
2976 /* Make a ".reg/999" section. */
2977 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
2978 size, note->descpos + offset);
2983 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
2985 switch (note->descsz)
2990 case 128: /* GNU/Linux elf_prpsinfo */
2991 elf_tdata (abfd)->core_program
2992 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
2993 elf_tdata (abfd)->core_command
2994 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
2997 /* Note that for some reason, a spurious space is tacked
2998 onto the end of the args in some (at least one anyway)
2999 implementations, so strip it off if it exists. */
3002 char *command = elf_tdata (abfd)->core_command;
3003 int n = strlen (command);
3005 if (0 < n && command[n - 1] == ' ')
3006 command[n - 1] = '\0';
3013 /* Generic Xtensa configurability stuff. */
3015 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3016 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3017 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3018 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3019 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3020 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3021 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3022 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3025 init_call_opcodes (void)
3027 if (callx0_op == XTENSA_UNDEFINED)
3029 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3030 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3031 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3032 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3033 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3034 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3035 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3036 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3042 is_indirect_call_opcode (xtensa_opcode opcode)
3044 init_call_opcodes ();
3045 return (opcode == callx0_op
3046 || opcode == callx4_op
3047 || opcode == callx8_op
3048 || opcode == callx12_op);
3053 is_direct_call_opcode (xtensa_opcode opcode)
3055 init_call_opcodes ();
3056 return (opcode == call0_op
3057 || opcode == call4_op
3058 || opcode == call8_op
3059 || opcode == call12_op);
3064 is_windowed_call_opcode (xtensa_opcode opcode)
3066 init_call_opcodes ();
3067 return (opcode == call4_op
3068 || opcode == call8_op
3069 || opcode == call12_op
3070 || opcode == callx4_op
3071 || opcode == callx8_op
3072 || opcode == callx12_op);
3076 static xtensa_opcode
3077 get_const16_opcode (void)
3079 static bfd_boolean done_lookup = FALSE;
3080 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3083 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3086 return const16_opcode;
3090 static xtensa_opcode
3091 get_l32r_opcode (void)
3093 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3094 static bfd_boolean done_lookup = FALSE;
3098 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3106 l32r_offset (bfd_vma addr, bfd_vma pc)
3110 offset = addr - ((pc+3) & -4);
3111 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3112 offset = (signed int) offset >> 2;
3113 BFD_ASSERT ((signed int) offset >> 16 == -1);
3119 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3121 xtensa_isa isa = xtensa_default_isa;
3122 int last_immed, last_opnd, opi;
3124 if (opcode == XTENSA_UNDEFINED)
3125 return XTENSA_UNDEFINED;
3127 /* Find the last visible PC-relative immediate operand for the opcode.
3128 If there are no PC-relative immediates, then choose the last visible
3129 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3130 last_immed = XTENSA_UNDEFINED;
3131 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3132 for (opi = last_opnd - 1; opi >= 0; opi--)
3134 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3136 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3141 if (last_immed == XTENSA_UNDEFINED
3142 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3146 return XTENSA_UNDEFINED;
3148 /* If the operand number was specified in an old-style relocation,
3149 check for consistency with the operand computed above. */
3150 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3152 int reloc_opnd = r_type - R_XTENSA_OP0;
3153 if (reloc_opnd != last_immed)
3154 return XTENSA_UNDEFINED;
3162 get_relocation_slot (int r_type)
3172 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3173 return r_type - R_XTENSA_SLOT0_OP;
3174 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3175 return r_type - R_XTENSA_SLOT0_ALT;
3179 return XTENSA_UNDEFINED;
3183 /* Get the opcode for a relocation. */
3185 static xtensa_opcode
3186 get_relocation_opcode (bfd *abfd,
3189 Elf_Internal_Rela *irel)
3191 static xtensa_insnbuf ibuff = NULL;
3192 static xtensa_insnbuf sbuff = NULL;
3193 xtensa_isa isa = xtensa_default_isa;
3197 if (contents == NULL)
3198 return XTENSA_UNDEFINED;
3200 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3201 return XTENSA_UNDEFINED;
3205 ibuff = xtensa_insnbuf_alloc (isa);
3206 sbuff = xtensa_insnbuf_alloc (isa);
3209 /* Decode the instruction. */
3210 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3211 sec->size - irel->r_offset);
3212 fmt = xtensa_format_decode (isa, ibuff);
3213 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3214 if (slot == XTENSA_UNDEFINED)
3215 return XTENSA_UNDEFINED;
3216 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3217 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3222 is_l32r_relocation (bfd *abfd,
3225 Elf_Internal_Rela *irel)
3227 xtensa_opcode opcode;
3228 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3230 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3231 return (opcode == get_l32r_opcode ());
3235 static bfd_size_type
3236 get_asm_simplify_size (bfd_byte *contents,
3237 bfd_size_type content_len,
3238 bfd_size_type offset)
3240 bfd_size_type insnlen, size = 0;
3242 /* Decode the size of the next two instructions. */
3243 insnlen = insn_decode_len (contents, content_len, offset);
3249 insnlen = insn_decode_len (contents, content_len, offset + size);
3259 is_alt_relocation (int r_type)
3261 return (r_type >= R_XTENSA_SLOT0_ALT
3262 && r_type <= R_XTENSA_SLOT14_ALT);
3267 is_operand_relocation (int r_type)
3277 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3279 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3288 #define MIN_INSN_LENGTH 2
3290 /* Return 0 if it fails to decode. */
3293 insn_decode_len (bfd_byte *contents,
3294 bfd_size_type content_len,
3295 bfd_size_type offset)
3298 xtensa_isa isa = xtensa_default_isa;
3300 static xtensa_insnbuf ibuff = NULL;
3302 if (offset + MIN_INSN_LENGTH > content_len)
3306 ibuff = xtensa_insnbuf_alloc (isa);
3307 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3308 content_len - offset);
3309 fmt = xtensa_format_decode (isa, ibuff);
3310 if (fmt == XTENSA_UNDEFINED)
3312 insn_len = xtensa_format_length (isa, fmt);
3313 if (insn_len == XTENSA_UNDEFINED)
3319 /* Decode the opcode for a single slot instruction.
3320 Return 0 if it fails to decode or the instruction is multi-slot. */
3323 insn_decode_opcode (bfd_byte *contents,
3324 bfd_size_type content_len,
3325 bfd_size_type offset,
3328 xtensa_isa isa = xtensa_default_isa;
3330 static xtensa_insnbuf insnbuf = NULL;
3331 static xtensa_insnbuf slotbuf = NULL;
3333 if (offset + MIN_INSN_LENGTH > content_len)
3334 return XTENSA_UNDEFINED;
3336 if (insnbuf == NULL)
3338 insnbuf = xtensa_insnbuf_alloc (isa);
3339 slotbuf = xtensa_insnbuf_alloc (isa);
3342 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3343 content_len - offset);
3344 fmt = xtensa_format_decode (isa, insnbuf);
3345 if (fmt == XTENSA_UNDEFINED)
3346 return XTENSA_UNDEFINED;
3348 if (slot >= xtensa_format_num_slots (isa, fmt))
3349 return XTENSA_UNDEFINED;
3351 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3352 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3356 /* The offset is the offset in the contents.
3357 The address is the address of that offset. */
3360 check_branch_target_aligned (bfd_byte *contents,
3361 bfd_size_type content_length,
3365 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3368 return check_branch_target_aligned_address (address, insn_len);
3373 check_loop_aligned (bfd_byte *contents,
3374 bfd_size_type content_length,
3378 bfd_size_type loop_len, insn_len;
3379 xtensa_opcode opcode;
3381 opcode = insn_decode_opcode (contents, content_length, offset, 0);
3382 if (opcode == XTENSA_UNDEFINED
3383 || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1)
3389 loop_len = insn_decode_len (contents, content_length, offset);
3390 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3391 if (loop_len == 0 || insn_len == 0)
3397 return check_branch_target_aligned_address (address + loop_len, insn_len);
3402 check_branch_target_aligned_address (bfd_vma addr, int len)
3405 return (addr % 8 == 0);
3406 return ((addr >> 2) == ((addr + len - 1) >> 2));
3410 /* Instruction widening and narrowing. */
3412 /* When FLIX is available we need to access certain instructions only
3413 when they are 16-bit or 24-bit instructions. This table caches
3414 information about such instructions by walking through all the
3415 opcodes and finding the smallest single-slot format into which each
3418 static xtensa_format *op_single_fmt_table = NULL;
3422 init_op_single_format_table (void)
3424 xtensa_isa isa = xtensa_default_isa;
3425 xtensa_insnbuf ibuf;
3426 xtensa_opcode opcode;
3430 if (op_single_fmt_table)
3433 ibuf = xtensa_insnbuf_alloc (isa);
3434 num_opcodes = xtensa_isa_num_opcodes (isa);
3436 op_single_fmt_table = (xtensa_format *)
3437 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3438 for (opcode = 0; opcode < num_opcodes; opcode++)
3440 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3441 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3443 if (xtensa_format_num_slots (isa, fmt) == 1
3444 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3446 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3447 int fmt_length = xtensa_format_length (isa, fmt);
3448 if (old_fmt == XTENSA_UNDEFINED
3449 || fmt_length < xtensa_format_length (isa, old_fmt))
3450 op_single_fmt_table[opcode] = fmt;
3454 xtensa_insnbuf_free (isa, ibuf);
3458 static xtensa_format
3459 get_single_format (xtensa_opcode opcode)
3461 init_op_single_format_table ();
3462 return op_single_fmt_table[opcode];
3466 /* For the set of narrowable instructions we do NOT include the
3467 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3468 involved during linker relaxation that may require these to
3469 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3470 requires special case code to ensure it only works when op1 == op2. */
3478 struct string_pair narrowable[] =
3481 { "addi", "addi.n" },
3482 { "addmi", "addi.n" },
3483 { "l32i", "l32i.n" },
3484 { "movi", "movi.n" },
3486 { "retw", "retw.n" },
3487 { "s32i", "s32i.n" },
3488 { "or", "mov.n" } /* special case only when op1 == op2 */
3491 struct string_pair widenable[] =
3494 { "addi", "addi.n" },
3495 { "addmi", "addi.n" },
3496 { "beqz", "beqz.n" },
3497 { "bnez", "bnez.n" },
3498 { "l32i", "l32i.n" },
3499 { "movi", "movi.n" },
3501 { "retw", "retw.n" },
3502 { "s32i", "s32i.n" },
3503 { "or", "mov.n" } /* special case only when op1 == op2 */
3507 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3508 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3509 return the instruction buffer holding the narrow instruction. Otherwise,
3510 return 0. The set of valid narrowing are specified by a string table
3511 but require some special case operand checks in some cases. */
3513 static xtensa_insnbuf
3514 can_narrow_instruction (xtensa_insnbuf slotbuf,
3516 xtensa_opcode opcode)
3518 xtensa_isa isa = xtensa_default_isa;
3519 xtensa_format o_fmt;
3522 static xtensa_insnbuf o_insnbuf = NULL;
3523 static xtensa_insnbuf o_slotbuf = NULL;
3525 if (o_insnbuf == NULL)
3527 o_insnbuf = xtensa_insnbuf_alloc (isa);
3528 o_slotbuf = xtensa_insnbuf_alloc (isa);
3531 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++)
3533 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3535 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3537 uint32 value, newval;
3538 int i, operand_count, o_operand_count;
3539 xtensa_opcode o_opcode;
3541 /* Address does not matter in this case. We might need to
3542 fix it to handle branches/jumps. */
3543 bfd_vma self_address = 0;
3545 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3546 if (o_opcode == XTENSA_UNDEFINED)
3548 o_fmt = get_single_format (o_opcode);
3549 if (o_fmt == XTENSA_UNDEFINED)
3552 if (xtensa_format_length (isa, fmt) != 3
3553 || xtensa_format_length (isa, o_fmt) != 2)
3556 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3557 operand_count = xtensa_opcode_num_operands (isa, opcode);
3558 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3560 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3565 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3570 uint32 rawval0, rawval1, rawval2;
3572 if (o_operand_count + 1 != operand_count
3573 || xtensa_operand_get_field (isa, opcode, 0,
3574 fmt, 0, slotbuf, &rawval0) != 0
3575 || xtensa_operand_get_field (isa, opcode, 1,
3576 fmt, 0, slotbuf, &rawval1) != 0
3577 || xtensa_operand_get_field (isa, opcode, 2,
3578 fmt, 0, slotbuf, &rawval2) != 0
3579 || rawval1 != rawval2
3580 || rawval0 == rawval1 /* it is a nop */)
3584 for (i = 0; i < o_operand_count; ++i)
3586 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3588 || xtensa_operand_decode (isa, opcode, i, &value))
3591 /* PC-relative branches need adjustment, but
3592 the PC-rel operand will always have a relocation. */
3594 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3596 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3597 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3602 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3612 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3613 the action in-place directly into the contents and return TRUE. Otherwise,
3614 the return value is FALSE and the contents are not modified. */
3617 narrow_instruction (bfd_byte *contents,
3618 bfd_size_type content_length,
3619 bfd_size_type offset)
3621 xtensa_opcode opcode;
3622 bfd_size_type insn_len;
3623 xtensa_isa isa = xtensa_default_isa;
3625 xtensa_insnbuf o_insnbuf;
3627 static xtensa_insnbuf insnbuf = NULL;
3628 static xtensa_insnbuf slotbuf = NULL;
3630 if (insnbuf == NULL)
3632 insnbuf = xtensa_insnbuf_alloc (isa);
3633 slotbuf = xtensa_insnbuf_alloc (isa);
3636 BFD_ASSERT (offset < content_length);
3638 if (content_length < 2)
3641 /* We will hand-code a few of these for a little while.
3642 These have all been specified in the assembler aleady. */
3643 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3644 content_length - offset);
3645 fmt = xtensa_format_decode (isa, insnbuf);
3646 if (xtensa_format_num_slots (isa, fmt) != 1)
3649 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3652 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3653 if (opcode == XTENSA_UNDEFINED)
3655 insn_len = xtensa_format_length (isa, fmt);
3656 if (insn_len > content_length)
3659 o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode);
3662 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3663 content_length - offset);
3671 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3672 "density" instruction to a standard 3-byte instruction. If it is valid,
3673 return the instruction buffer holding the wide instruction. Otherwise,
3674 return 0. The set of valid widenings are specified by a string table
3675 but require some special case operand checks in some cases. */
3677 static xtensa_insnbuf
3678 can_widen_instruction (xtensa_insnbuf slotbuf,
3680 xtensa_opcode opcode)
3682 xtensa_isa isa = xtensa_default_isa;
3683 xtensa_format o_fmt;
3686 static xtensa_insnbuf o_insnbuf = NULL;
3687 static xtensa_insnbuf o_slotbuf = NULL;
3689 if (o_insnbuf == NULL)
3691 o_insnbuf = xtensa_insnbuf_alloc (isa);
3692 o_slotbuf = xtensa_insnbuf_alloc (isa);
3695 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++)
3697 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3698 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3699 || strcmp ("bnez", widenable[opi].wide) == 0);
3701 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3703 uint32 value, newval;
3704 int i, operand_count, o_operand_count, check_operand_count;
3705 xtensa_opcode o_opcode;
3707 /* Address does not matter in this case. We might need to fix it
3708 to handle branches/jumps. */
3709 bfd_vma self_address = 0;
3711 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3712 if (o_opcode == XTENSA_UNDEFINED)
3714 o_fmt = get_single_format (o_opcode);
3715 if (o_fmt == XTENSA_UNDEFINED)
3718 if (xtensa_format_length (isa, fmt) != 2
3719 || xtensa_format_length (isa, o_fmt) != 3)
3722 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3723 operand_count = xtensa_opcode_num_operands (isa, opcode);
3724 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3725 check_operand_count = o_operand_count;
3727 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3732 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3737 uint32 rawval0, rawval1;
3739 if (o_operand_count != operand_count + 1
3740 || xtensa_operand_get_field (isa, opcode, 0,
3741 fmt, 0, slotbuf, &rawval0) != 0
3742 || xtensa_operand_get_field (isa, opcode, 1,
3743 fmt, 0, slotbuf, &rawval1) != 0
3744 || rawval0 == rawval1 /* it is a nop */)
3748 check_operand_count--;
3750 for (i = 0; i < check_operand_count; i++)
3753 if (is_or && i == o_operand_count - 1)
3755 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3757 || xtensa_operand_decode (isa, opcode, new_i, &value))
3760 /* PC-relative branches need adjustment, but
3761 the PC-rel operand will always have a relocation. */
3763 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3765 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3766 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3771 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3781 /* Attempt to widen an instruction. If the widening is valid, perform
3782 the action in-place directly into the contents and return TRUE. Otherwise,
3783 the return value is FALSE and the contents are not modified. */
3786 widen_instruction (bfd_byte *contents,
3787 bfd_size_type content_length,
3788 bfd_size_type offset)
3790 xtensa_opcode opcode;
3791 bfd_size_type insn_len;
3792 xtensa_isa isa = xtensa_default_isa;
3794 xtensa_insnbuf o_insnbuf;
3796 static xtensa_insnbuf insnbuf = NULL;
3797 static xtensa_insnbuf slotbuf = NULL;
3799 if (insnbuf == NULL)
3801 insnbuf = xtensa_insnbuf_alloc (isa);
3802 slotbuf = xtensa_insnbuf_alloc (isa);
3805 BFD_ASSERT (offset < content_length);
3807 if (content_length < 2)
3810 /* We will hand-code a few of these for a little while.
3811 These have all been specified in the assembler aleady. */
3812 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3813 content_length - offset);
3814 fmt = xtensa_format_decode (isa, insnbuf);
3815 if (xtensa_format_num_slots (isa, fmt) != 1)
3818 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3821 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3822 if (opcode == XTENSA_UNDEFINED)
3824 insn_len = xtensa_format_length (isa, fmt);
3825 if (insn_len > content_length)
3828 o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode);
3831 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3832 content_length - offset);
3839 /* Code for transforming CALLs at link-time. */
3841 static bfd_reloc_status_type
3842 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3844 bfd_vma content_length,
3845 char **error_message)
3847 static xtensa_insnbuf insnbuf = NULL;
3848 static xtensa_insnbuf slotbuf = NULL;
3849 xtensa_format core_format = XTENSA_UNDEFINED;
3850 xtensa_opcode opcode;
3851 xtensa_opcode direct_call_opcode;
3852 xtensa_isa isa = xtensa_default_isa;
3853 bfd_byte *chbuf = contents + address;
3856 if (insnbuf == NULL)
3858 insnbuf = xtensa_insnbuf_alloc (isa);
3859 slotbuf = xtensa_insnbuf_alloc (isa);
3862 if (content_length < address)
3864 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3865 return bfd_reloc_other;
3868 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3869 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3870 if (direct_call_opcode == XTENSA_UNDEFINED)
3872 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3873 return bfd_reloc_other;
3876 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3877 core_format = xtensa_format_lookup (isa, "x24");
3878 opcode = xtensa_opcode_lookup (isa, "or");
3879 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3880 for (opn = 0; opn < 3; opn++)
3883 xtensa_operand_encode (isa, opcode, opn, ®no);
3884 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3887 xtensa_format_encode (isa, core_format, insnbuf);
3888 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3889 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3891 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3892 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3893 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3895 xtensa_format_encode (isa, core_format, insnbuf);
3896 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3897 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3898 content_length - address - 3);
3900 return bfd_reloc_ok;
3904 static bfd_reloc_status_type
3905 contract_asm_expansion (bfd_byte *contents,
3906 bfd_vma content_length,
3907 Elf_Internal_Rela *irel,
3908 char **error_message)
3910 bfd_reloc_status_type retval =
3911 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3914 if (retval != bfd_reloc_ok)
3915 return bfd_reloc_dangerous;
3917 /* Update the irel->r_offset field so that the right immediate and
3918 the right instruction are modified during the relocation. */
3919 irel->r_offset += 3;
3920 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3921 return bfd_reloc_ok;
3925 static xtensa_opcode
3926 swap_callx_for_call_opcode (xtensa_opcode opcode)
3928 init_call_opcodes ();
3930 if (opcode == callx0_op) return call0_op;
3931 if (opcode == callx4_op) return call4_op;
3932 if (opcode == callx8_op) return call8_op;
3933 if (opcode == callx12_op) return call12_op;
3935 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3936 return XTENSA_UNDEFINED;
3940 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3941 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3942 If not, return XTENSA_UNDEFINED. */
3944 #define L32R_TARGET_REG_OPERAND 0
3945 #define CONST16_TARGET_REG_OPERAND 0
3946 #define CALLN_SOURCE_OPERAND 0
3948 static xtensa_opcode
3949 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3951 static xtensa_insnbuf insnbuf = NULL;
3952 static xtensa_insnbuf slotbuf = NULL;
3954 xtensa_opcode opcode;
3955 xtensa_isa isa = xtensa_default_isa;
3956 uint32 regno, const16_regno, call_regno;
3959 if (insnbuf == NULL)
3961 insnbuf = xtensa_insnbuf_alloc (isa);
3962 slotbuf = xtensa_insnbuf_alloc (isa);
3965 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3966 fmt = xtensa_format_decode (isa, insnbuf);
3967 if (fmt == XTENSA_UNDEFINED
3968 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3969 return XTENSA_UNDEFINED;
3971 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3972 if (opcode == XTENSA_UNDEFINED)
3973 return XTENSA_UNDEFINED;
3975 if (opcode == get_l32r_opcode ())
3978 *p_uses_l32r = TRUE;
3979 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
3980 fmt, 0, slotbuf, ®no)
3981 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
3983 return XTENSA_UNDEFINED;
3985 else if (opcode == get_const16_opcode ())
3988 *p_uses_l32r = FALSE;
3989 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
3990 fmt, 0, slotbuf, ®no)
3991 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
3993 return XTENSA_UNDEFINED;
3995 /* Check that the next instruction is also CONST16. */
3996 offset += xtensa_format_length (isa, fmt);
3997 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
3998 fmt = xtensa_format_decode (isa, insnbuf);
3999 if (fmt == XTENSA_UNDEFINED
4000 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4001 return XTENSA_UNDEFINED;
4002 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4003 if (opcode != get_const16_opcode ())
4004 return XTENSA_UNDEFINED;
4006 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4007 fmt, 0, slotbuf, &const16_regno)
4008 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4010 || const16_regno != regno)
4011 return XTENSA_UNDEFINED;
4014 return XTENSA_UNDEFINED;
4016 /* Next instruction should be an CALLXn with operand 0 == regno. */
4017 offset += xtensa_format_length (isa, fmt);
4018 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4019 fmt = xtensa_format_decode (isa, insnbuf);
4020 if (fmt == XTENSA_UNDEFINED
4021 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4022 return XTENSA_UNDEFINED;
4023 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4024 if (opcode == XTENSA_UNDEFINED
4025 || !is_indirect_call_opcode (opcode))
4026 return XTENSA_UNDEFINED;
4028 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4029 fmt, 0, slotbuf, &call_regno)
4030 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4032 return XTENSA_UNDEFINED;
4034 if (call_regno != regno)
4035 return XTENSA_UNDEFINED;
4041 /* Data structures used during relaxation. */
4043 /* r_reloc: relocation values. */
4045 /* Through the relaxation process, we need to keep track of the values
4046 that will result from evaluating relocations. The standard ELF
4047 relocation structure is not sufficient for this purpose because we're
4048 operating on multiple input files at once, so we need to know which
4049 input file a relocation refers to. The r_reloc structure thus
4050 records both the input file (bfd) and ELF relocation.
4052 For efficiency, an r_reloc also contains a "target_offset" field to
4053 cache the target-section-relative offset value that is represented by
4056 The r_reloc also contains a virtual offset that allows multiple
4057 inserted literals to be placed at the same "address" with
4058 different offsets. */
4060 typedef struct r_reloc_struct r_reloc;
4062 struct r_reloc_struct
4065 Elf_Internal_Rela rela;
4066 bfd_vma target_offset;
4067 bfd_vma virtual_offset;
4071 /* The r_reloc structure is included by value in literal_value, but not
4072 every literal_value has an associated relocation -- some are simple
4073 constants. In such cases, we set all the fields in the r_reloc
4074 struct to zero. The r_reloc_is_const function should be used to
4075 detect this case. */
4078 r_reloc_is_const (const r_reloc *r_rel)
4080 return (r_rel->abfd == NULL);
4085 r_reloc_get_target_offset (const r_reloc *r_rel)
4087 bfd_vma target_offset;
4088 unsigned long r_symndx;
4090 BFD_ASSERT (!r_reloc_is_const (r_rel));
4091 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4092 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4093 return (target_offset + r_rel->rela.r_addend);
4097 static struct elf_link_hash_entry *
4098 r_reloc_get_hash_entry (const r_reloc *r_rel)
4100 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4101 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4106 r_reloc_get_section (const r_reloc *r_rel)
4108 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4109 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4114 r_reloc_is_defined (const r_reloc *r_rel)
4120 sec = r_reloc_get_section (r_rel);
4121 if (sec == bfd_abs_section_ptr
4122 || sec == bfd_com_section_ptr
4123 || sec == bfd_und_section_ptr)
4130 r_reloc_init (r_reloc *r_rel,
4132 Elf_Internal_Rela *irel,
4134 bfd_size_type content_length)
4137 reloc_howto_type *howto;
4141 r_rel->rela = *irel;
4143 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4144 r_rel->virtual_offset = 0;
4145 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4146 howto = &elf_howto_table[r_type];
4147 if (howto->partial_inplace)
4149 bfd_vma inplace_val;
4150 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4152 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4153 r_rel->target_offset += inplace_val;
4157 memset (r_rel, 0, sizeof (r_reloc));
4164 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4166 if (r_reloc_is_defined (r_rel))
4168 asection *sec = r_reloc_get_section (r_rel);
4169 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4171 else if (r_reloc_get_hash_entry (r_rel))
4172 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4174 fprintf (fp, " ?? + ");
4176 fprintf_vma (fp, r_rel->target_offset);
4177 if (r_rel->virtual_offset)
4179 fprintf (fp, " + ");
4180 fprintf_vma (fp, r_rel->virtual_offset);
4189 /* source_reloc: relocations that reference literals. */
4191 /* To determine whether literals can be coalesced, we need to first
4192 record all the relocations that reference the literals. The
4193 source_reloc structure below is used for this purpose. The
4194 source_reloc entries are kept in a per-literal-section array, sorted
4195 by offset within the literal section (i.e., target offset).
4197 The source_sec and r_rel.rela.r_offset fields identify the source of
4198 the relocation. The r_rel field records the relocation value, i.e.,
4199 the offset of the literal being referenced. The opnd field is needed
4200 to determine the range of the immediate field to which the relocation
4201 applies, so we can determine whether another literal with the same
4202 value is within range. The is_null field is true when the relocation
4203 is being removed (e.g., when an L32R is being removed due to a CALLX
4204 that is converted to a direct CALL). */
4206 typedef struct source_reloc_struct source_reloc;
4208 struct source_reloc_struct
4210 asection *source_sec;
4212 xtensa_opcode opcode;
4214 bfd_boolean is_null;
4215 bfd_boolean is_abs_literal;
4220 init_source_reloc (source_reloc *reloc,
4221 asection *source_sec,
4222 const r_reloc *r_rel,
4223 xtensa_opcode opcode,
4225 bfd_boolean is_abs_literal)
4227 reloc->source_sec = source_sec;
4228 reloc->r_rel = *r_rel;
4229 reloc->opcode = opcode;
4231 reloc->is_null = FALSE;
4232 reloc->is_abs_literal = is_abs_literal;
4236 /* Find the source_reloc for a particular source offset and relocation
4237 type. Note that the array is sorted by _target_ offset, so this is
4238 just a linear search. */
4240 static source_reloc *
4241 find_source_reloc (source_reloc *src_relocs,
4244 Elf_Internal_Rela *irel)
4248 for (i = 0; i < src_count; i++)
4250 if (src_relocs[i].source_sec == sec
4251 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4252 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4253 == ELF32_R_TYPE (irel->r_info)))
4254 return &src_relocs[i];
4262 source_reloc_compare (const void *ap, const void *bp)
4264 const source_reloc *a = (const source_reloc *) ap;
4265 const source_reloc *b = (const source_reloc *) bp;
4267 if (a->r_rel.target_offset != b->r_rel.target_offset)
4268 return (a->r_rel.target_offset - b->r_rel.target_offset);
4270 /* We don't need to sort on these criteria for correctness,
4271 but enforcing a more strict ordering prevents unstable qsort
4272 from behaving differently with different implementations.
4273 Without the code below we get correct but different results
4274 on Solaris 2.7 and 2.8. We would like to always produce the
4275 same results no matter the host. */
4277 if ((!a->is_null) - (!b->is_null))
4278 return ((!a->is_null) - (!b->is_null));
4279 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4283 /* Literal values and value hash tables. */
4285 /* Literals with the same value can be coalesced. The literal_value
4286 structure records the value of a literal: the "r_rel" field holds the
4287 information from the relocation on the literal (if there is one) and
4288 the "value" field holds the contents of the literal word itself.
4290 The value_map structure records a literal value along with the
4291 location of a literal holding that value. The value_map hash table
4292 is indexed by the literal value, so that we can quickly check if a
4293 particular literal value has been seen before and is thus a candidate
4296 typedef struct literal_value_struct literal_value;
4297 typedef struct value_map_struct value_map;
4298 typedef struct value_map_hash_table_struct value_map_hash_table;
4300 struct literal_value_struct
4303 unsigned long value;
4304 bfd_boolean is_abs_literal;
4307 struct value_map_struct
4309 literal_value val; /* The literal value. */
4310 r_reloc loc; /* Location of the literal. */
4314 struct value_map_hash_table_struct
4316 unsigned bucket_count;
4317 value_map **buckets;
4319 bfd_boolean has_last_loc;
4325 init_literal_value (literal_value *lit,
4326 const r_reloc *r_rel,
4327 unsigned long value,
4328 bfd_boolean is_abs_literal)
4330 lit->r_rel = *r_rel;
4332 lit->is_abs_literal = is_abs_literal;
4337 literal_value_equal (const literal_value *src1,
4338 const literal_value *src2,
4339 bfd_boolean final_static_link)
4341 struct elf_link_hash_entry *h1, *h2;
4343 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4346 if (r_reloc_is_const (&src1->r_rel))
4347 return (src1->value == src2->value);
4349 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4350 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4353 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4356 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4359 if (src1->value != src2->value)
4362 /* Now check for the same section (if defined) or the same elf_hash
4363 (if undefined or weak). */
4364 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4365 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4366 if (r_reloc_is_defined (&src1->r_rel)
4367 && (final_static_link
4368 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4369 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4371 if (r_reloc_get_section (&src1->r_rel)
4372 != r_reloc_get_section (&src2->r_rel))
4377 /* Require that the hash entries (i.e., symbols) be identical. */
4378 if (h1 != h2 || h1 == 0)
4382 if (src1->is_abs_literal != src2->is_abs_literal)
4389 /* Must be power of 2. */
4390 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4392 static value_map_hash_table *
4393 value_map_hash_table_init (void)
4395 value_map_hash_table *values;
4397 values = (value_map_hash_table *)
4398 bfd_zmalloc (sizeof (value_map_hash_table));
4399 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4401 values->buckets = (value_map **)
4402 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4403 if (values->buckets == NULL)
4408 values->has_last_loc = FALSE;
4415 value_map_hash_table_delete (value_map_hash_table *table)
4417 free (table->buckets);
4423 hash_bfd_vma (bfd_vma val)
4425 return (val >> 2) + (val >> 10);
4430 literal_value_hash (const literal_value *src)
4434 hash_val = hash_bfd_vma (src->value);
4435 if (!r_reloc_is_const (&src->r_rel))
4439 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4440 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4441 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4443 /* Now check for the same section and the same elf_hash. */
4444 if (r_reloc_is_defined (&src->r_rel))
4445 sec_or_hash = r_reloc_get_section (&src->r_rel);
4447 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4448 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4454 /* Check if the specified literal_value has been seen before. */
4457 value_map_get_cached_value (value_map_hash_table *map,
4458 const literal_value *val,
4459 bfd_boolean final_static_link)
4465 idx = literal_value_hash (val);
4466 idx = idx & (map->bucket_count - 1);
4467 bucket = map->buckets[idx];
4468 for (map_e = bucket; map_e; map_e = map_e->next)
4470 if (literal_value_equal (&map_e->val, val, final_static_link))
4477 /* Record a new literal value. It is illegal to call this if VALUE
4478 already has an entry here. */
4481 add_value_map (value_map_hash_table *map,
4482 const literal_value *val,
4484 bfd_boolean final_static_link)
4486 value_map **bucket_p;
4489 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4492 bfd_set_error (bfd_error_no_memory);
4496 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4500 idx = literal_value_hash (val);
4501 idx = idx & (map->bucket_count - 1);
4502 bucket_p = &map->buckets[idx];
4504 val_e->next = *bucket_p;
4507 /* FIXME: Consider resizing the hash table if we get too many entries. */
4513 /* Lists of text actions (ta_) for narrowing, widening, longcall
4514 conversion, space fill, code & literal removal, etc. */
4516 /* The following text actions are generated:
4518 "ta_remove_insn" remove an instruction or instructions
4519 "ta_remove_longcall" convert longcall to call
4520 "ta_convert_longcall" convert longcall to nop/call
4521 "ta_narrow_insn" narrow a wide instruction
4522 "ta_widen" widen a narrow instruction
4523 "ta_fill" add fill or remove fill
4524 removed < 0 is a fill; branches to the fill address will be
4525 changed to address + fill size (e.g., address - removed)
4526 removed >= 0 branches to the fill address will stay unchanged
4527 "ta_remove_literal" remove a literal; this action is
4528 indicated when a literal is removed
4530 "ta_add_literal" insert a new literal; this action is
4531 indicated when a literal has been moved.
4532 It may use a virtual_offset because
4533 multiple literals can be placed at the
4536 For each of these text actions, we also record the number of bytes
4537 removed by performing the text action. In the case of a "ta_widen"
4538 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4540 typedef struct text_action_struct text_action;
4541 typedef struct text_action_list_struct text_action_list;
4542 typedef enum text_action_enum_t text_action_t;
4544 enum text_action_enum_t
4547 ta_remove_insn, /* removed = -size */
4548 ta_remove_longcall, /* removed = -size */
4549 ta_convert_longcall, /* removed = 0 */
4550 ta_narrow_insn, /* removed = -1 */
4551 ta_widen_insn, /* removed = +1 */
4552 ta_fill, /* removed = +size */
4558 /* Structure for a text action record. */
4559 struct text_action_struct
4561 text_action_t action;
4562 asection *sec; /* Optional */
4564 bfd_vma virtual_offset; /* Zero except for adding literals. */
4566 literal_value value; /* Only valid when adding literals. */
4572 /* List of all of the actions taken on a text section. */
4573 struct text_action_list_struct
4579 static text_action *
4580 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4584 /* It is not necessary to fill at the end of a section. */
4585 if (sec->size == offset)
4588 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4590 text_action *t = *m_p;
4591 /* When the action is another fill at the same address,
4592 just increase the size. */
4593 if (t->offset == offset && t->action == ta_fill)
4601 compute_removed_action_diff (const text_action *ta,
4605 int removable_space)
4608 int current_removed = 0;
4611 current_removed = ta->removed_bytes;
4613 BFD_ASSERT (ta == NULL || ta->offset == offset);
4614 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4616 /* It is not necessary to fill at the end of a section. Clean this up. */
4617 if (sec->size == offset)
4618 new_removed = removable_space - 0;
4622 int added = -removed - current_removed;
4623 /* Ignore multiples of the section alignment. */
4624 added = ((1 << sec->alignment_power) - 1) & added;
4625 new_removed = (-added);
4627 /* Modify for removable. */
4628 space = removable_space - new_removed;
4629 new_removed = (removable_space
4630 - (((1 << sec->alignment_power) - 1) & space));
4632 return (new_removed - current_removed);
4637 adjust_fill_action (text_action *ta, int fill_diff)
4639 ta->removed_bytes += fill_diff;
4643 /* Add a modification action to the text. For the case of adding or
4644 removing space, modify any current fill and assume that
4645 "unreachable_space" bytes can be freely contracted. Note that a
4646 negative removed value is a fill. */
4649 text_action_add (text_action_list *l,
4650 text_action_t action,
4658 /* It is not necessary to fill at the end of a section. */
4659 if (action == ta_fill && sec->size == offset)
4662 /* It is not necessary to fill 0 bytes. */
4663 if (action == ta_fill && removed == 0)
4666 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4668 text_action *t = *m_p;
4669 /* When the action is another fill at the same address,
4670 just increase the size. */
4671 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4673 t->removed_bytes += removed;
4678 /* Create a new record and fill it up. */
4679 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4680 ta->action = action;
4682 ta->offset = offset;
4683 ta->removed_bytes = removed;
4690 text_action_add_literal (text_action_list *l,
4691 text_action_t action,
4693 const literal_value *value,
4698 asection *sec = r_reloc_get_section (loc);
4699 bfd_vma offset = loc->target_offset;
4700 bfd_vma virtual_offset = loc->virtual_offset;
4702 BFD_ASSERT (action == ta_add_literal);
4704 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4706 if ((*m_p)->offset > offset
4707 && ((*m_p)->offset != offset
4708 || (*m_p)->virtual_offset > virtual_offset))
4712 /* Create a new record and fill it up. */
4713 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4714 ta->action = action;
4716 ta->offset = offset;
4717 ta->virtual_offset = virtual_offset;
4719 ta->removed_bytes = removed;
4726 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4731 for (r = action_list->head; r && r->offset <= offset; r = r->next)
4733 if (r->offset < offset
4734 || (r->action == ta_fill && r->removed_bytes < 0))
4735 removed += r->removed_bytes;
4738 return (offset - removed);
4743 action_list_count (text_action_list *action_list)
4745 text_action *r = action_list->head;
4747 for (r = action_list->head; r != NULL; r = r->next)
4756 offset_with_removed_text_before_fill (text_action_list *action_list,
4762 for (r = action_list->head; r && r->offset < offset; r = r->next)
4763 removed += r->removed_bytes;
4765 return (offset - removed);
4769 /* The find_insn_action routine will only find non-fill actions. */
4771 static text_action *
4772 find_insn_action (text_action_list *action_list, bfd_vma offset)
4775 for (t = action_list->head; t; t = t->next)
4777 if (t->offset == offset)
4784 case ta_remove_insn:
4785 case ta_remove_longcall:
4786 case ta_convert_longcall:
4787 case ta_narrow_insn:
4790 case ta_remove_literal:
4791 case ta_add_literal:
4804 print_action_list (FILE *fp, text_action_list *action_list)
4808 fprintf (fp, "Text Action\n");
4809 for (r = action_list->head; r != NULL; r = r->next)
4811 const char *t = "unknown";
4814 case ta_remove_insn:
4815 t = "remove_insn"; break;
4816 case ta_remove_longcall:
4817 t = "remove_longcall"; break;
4818 case ta_convert_longcall:
4819 t = "remove_longcall"; break;
4820 case ta_narrow_insn:
4821 t = "narrow_insn"; break;
4823 t = "widen_insn"; break;
4828 case ta_remove_literal:
4829 t = "remove_literal"; break;
4830 case ta_add_literal:
4831 t = "add_literal"; break;
4834 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4835 r->sec->owner->filename,
4836 r->sec->name, r->offset, t, r->removed_bytes);
4843 /* Lists of literals being coalesced or removed. */
4845 /* In the usual case, the literal identified by "from" is being
4846 coalesced with another literal identified by "to". If the literal is
4847 unused and is being removed altogether, "to.abfd" will be NULL.
4848 The removed_literal entries are kept on a per-section list, sorted
4849 by the "from" offset field. */
4851 typedef struct removed_literal_struct removed_literal;
4852 typedef struct removed_literal_list_struct removed_literal_list;
4854 struct removed_literal_struct
4858 removed_literal *next;
4861 struct removed_literal_list_struct
4863 removed_literal *head;
4864 removed_literal *tail;
4868 /* Record that the literal at "from" is being removed. If "to" is not
4869 NULL, the "from" literal is being coalesced with the "to" literal. */
4872 add_removed_literal (removed_literal_list *removed_list,
4873 const r_reloc *from,
4876 removed_literal *r, *new_r, *next_r;
4878 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4880 new_r->from = *from;
4884 new_r->to.abfd = NULL;
4887 r = removed_list->head;
4890 removed_list->head = new_r;
4891 removed_list->tail = new_r;
4893 /* Special check for common case of append. */
4894 else if (removed_list->tail->from.target_offset < from->target_offset)
4896 removed_list->tail->next = new_r;
4897 removed_list->tail = new_r;
4901 while (r->from.target_offset < from->target_offset && r->next)
4907 new_r->next = next_r;
4909 removed_list->tail = new_r;
4914 /* Check if the list of removed literals contains an entry for the
4915 given address. Return the entry if found. */
4917 static removed_literal *
4918 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4920 removed_literal *r = removed_list->head;
4921 while (r && r->from.target_offset < addr)
4923 if (r && r->from.target_offset == addr)
4932 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4935 r = removed_list->head;
4937 fprintf (fp, "Removed Literals\n");
4938 for (; r != NULL; r = r->next)
4940 print_r_reloc (fp, &r->from);
4941 fprintf (fp, " => ");
4942 if (r->to.abfd == NULL)
4943 fprintf (fp, "REMOVED");
4945 print_r_reloc (fp, &r->to);
4953 /* Per-section data for relaxation. */
4955 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4957 struct xtensa_relax_info_struct
4959 bfd_boolean is_relaxable_literal_section;
4960 bfd_boolean is_relaxable_asm_section;
4961 int visited; /* Number of times visited. */
4963 source_reloc *src_relocs; /* Array[src_count]. */
4965 int src_next; /* Next src_relocs entry to assign. */
4967 removed_literal_list removed_list;
4968 text_action_list action_list;
4970 reloc_bfd_fix *fix_list;
4971 reloc_bfd_fix *fix_array;
4972 unsigned fix_array_count;
4974 /* Support for expanding the reloc array that is stored
4975 in the section structure. If the relocations have been
4976 reallocated, the newly allocated relocations will be referenced
4977 here along with the actual size allocated. The relocation
4978 count will always be found in the section structure. */
4979 Elf_Internal_Rela *allocated_relocs;
4980 unsigned relocs_count;
4981 unsigned allocated_relocs_count;
4984 struct elf_xtensa_section_data
4986 struct bfd_elf_section_data elf;
4987 xtensa_relax_info relax_info;
4992 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
4994 if (!sec->used_by_bfd)
4996 struct elf_xtensa_section_data *sdata;
4997 bfd_size_type amt = sizeof (*sdata);
4999 sdata = bfd_zalloc (abfd, amt);
5002 sec->used_by_bfd = sdata;
5005 return _bfd_elf_new_section_hook (abfd, sec);
5009 static xtensa_relax_info *
5010 get_xtensa_relax_info (asection *sec)
5012 struct elf_xtensa_section_data *section_data;
5014 /* No info available if no section or if it is an output section. */
5015 if (!sec || sec == sec->output_section)
5018 section_data = (struct elf_xtensa_section_data *) elf_section_data (sec);
5019 return §ion_data->relax_info;
5024 init_xtensa_relax_info (asection *sec)
5026 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5028 relax_info->is_relaxable_literal_section = FALSE;
5029 relax_info->is_relaxable_asm_section = FALSE;
5030 relax_info->visited = 0;
5032 relax_info->src_relocs = NULL;
5033 relax_info->src_count = 0;
5034 relax_info->src_next = 0;
5036 relax_info->removed_list.head = NULL;
5037 relax_info->removed_list.tail = NULL;
5039 relax_info->action_list.head = NULL;
5041 relax_info->fix_list = NULL;
5042 relax_info->fix_array = NULL;
5043 relax_info->fix_array_count = 0;
5045 relax_info->allocated_relocs = NULL;
5046 relax_info->relocs_count = 0;
5047 relax_info->allocated_relocs_count = 0;
5051 /* Coalescing literals may require a relocation to refer to a section in
5052 a different input file, but the standard relocation information
5053 cannot express that. Instead, the reloc_bfd_fix structures are used
5054 to "fix" the relocations that refer to sections in other input files.
5055 These structures are kept on per-section lists. The "src_type" field
5056 records the relocation type in case there are multiple relocations on
5057 the same location. FIXME: This is ugly; an alternative might be to
5058 add new symbols with the "owner" field to some other input file. */
5060 struct reloc_bfd_fix_struct
5064 unsigned src_type; /* Relocation type. */
5067 asection *target_sec;
5068 bfd_vma target_offset;
5069 bfd_boolean translated;
5071 reloc_bfd_fix *next;
5075 static reloc_bfd_fix *
5076 reloc_bfd_fix_init (asection *src_sec,
5080 asection *target_sec,
5081 bfd_vma target_offset,
5082 bfd_boolean translated)
5086 fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix));
5087 fix->src_sec = src_sec;
5088 fix->src_offset = src_offset;
5089 fix->src_type = src_type;
5090 fix->target_abfd = target_abfd;
5091 fix->target_sec = target_sec;
5092 fix->target_offset = target_offset;
5093 fix->translated = translated;
5100 add_fix (asection *src_sec, reloc_bfd_fix *fix)
5102 xtensa_relax_info *relax_info;
5104 relax_info = get_xtensa_relax_info (src_sec);
5105 fix->next = relax_info->fix_list;
5106 relax_info->fix_list = fix;
5111 fix_compare (const void *ap, const void *bp)
5113 const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap;
5114 const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp;
5116 if (a->src_offset != b->src_offset)
5117 return (a->src_offset - b->src_offset);
5118 return (a->src_type - b->src_type);
5123 cache_fix_array (asection *sec)
5125 unsigned i, count = 0;
5127 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5129 if (relax_info == NULL)
5131 if (relax_info->fix_list == NULL)
5134 for (r = relax_info->fix_list; r != NULL; r = r->next)
5137 relax_info->fix_array =
5138 (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count);
5139 relax_info->fix_array_count = count;
5141 r = relax_info->fix_list;
5142 for (i = 0; i < count; i++, r = r->next)
5144 relax_info->fix_array[count - 1 - i] = *r;
5145 relax_info->fix_array[count - 1 - i].next = NULL;
5148 qsort (relax_info->fix_array, relax_info->fix_array_count,
5149 sizeof (reloc_bfd_fix), fix_compare);
5153 static reloc_bfd_fix *
5154 get_bfd_fix (asection *sec, bfd_vma offset, unsigned type)
5156 xtensa_relax_info *relax_info = get_xtensa_relax_info (sec);
5160 if (relax_info == NULL)
5162 if (relax_info->fix_list == NULL)
5165 if (relax_info->fix_array == NULL)
5166 cache_fix_array (sec);
5168 key.src_offset = offset;
5169 key.src_type = type;
5170 rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count,
5171 sizeof (reloc_bfd_fix), fix_compare);
5176 /* Section caching. */
5178 typedef struct section_cache_struct section_cache_t;
5180 struct section_cache_struct
5184 bfd_byte *contents; /* Cache of the section contents. */
5185 bfd_size_type content_length;
5187 property_table_entry *ptbl; /* Cache of the section property table. */
5190 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5191 unsigned reloc_count;
5196 init_section_cache (section_cache_t *sec_cache)
5198 memset (sec_cache, 0, sizeof (*sec_cache));
5203 clear_section_cache (section_cache_t *sec_cache)
5207 release_contents (sec_cache->sec, sec_cache->contents);
5208 release_internal_relocs (sec_cache->sec, sec_cache->relocs);
5209 if (sec_cache->ptbl)
5210 free (sec_cache->ptbl);
5211 memset (sec_cache, 0, sizeof (sec_cache));
5217 section_cache_section (section_cache_t *sec_cache,
5219 struct bfd_link_info *link_info)
5222 property_table_entry *prop_table = NULL;
5224 bfd_byte *contents = NULL;
5225 Elf_Internal_Rela *internal_relocs = NULL;
5226 bfd_size_type sec_size;
5230 if (sec == sec_cache->sec)
5234 sec_size = bfd_get_section_limit (abfd, sec);
5236 /* Get the contents. */
5237 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5238 if (contents == NULL && sec_size != 0)
5241 /* Get the relocations. */
5242 internal_relocs = retrieve_internal_relocs (abfd, sec,
5243 link_info->keep_memory);
5245 /* Get the entry table. */
5246 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
5247 XTENSA_PROP_SEC_NAME, FALSE);
5251 /* Fill in the new section cache. */
5252 clear_section_cache (sec_cache);
5253 memset (sec_cache, 0, sizeof (sec_cache));
5255 sec_cache->sec = sec;
5256 sec_cache->contents = contents;
5257 sec_cache->content_length = sec_size;
5258 sec_cache->relocs = internal_relocs;
5259 sec_cache->reloc_count = sec->reloc_count;
5260 sec_cache->pte_count = ptblsize;
5261 sec_cache->ptbl = prop_table;
5266 release_contents (sec, contents);
5267 release_internal_relocs (sec, internal_relocs);
5274 /* Extended basic blocks. */
5276 /* An ebb_struct represents an Extended Basic Block. Within this
5277 range, we guarantee that all instructions are decodable, the
5278 property table entries are contiguous, and no property table
5279 specifies a segment that cannot have instructions moved. This
5280 structure contains caches of the contents, property table and
5281 relocations for the specified section for easy use. The range is
5282 specified by ranges of indices for the byte offset, property table
5283 offsets and relocation offsets. These must be consistent. */
5285 typedef struct ebb_struct ebb_t;
5291 bfd_byte *contents; /* Cache of the section contents. */
5292 bfd_size_type content_length;
5294 property_table_entry *ptbl; /* Cache of the section property table. */
5297 Elf_Internal_Rela *relocs; /* Cache of the section relocations. */
5298 unsigned reloc_count;
5300 bfd_vma start_offset; /* Offset in section. */
5301 unsigned start_ptbl_idx; /* Offset in the property table. */
5302 unsigned start_reloc_idx; /* Offset in the relocations. */
5305 unsigned end_ptbl_idx;
5306 unsigned end_reloc_idx;
5308 bfd_boolean ends_section; /* Is this the last ebb in a section? */
5310 /* The unreachable property table at the end of this set of blocks;
5311 NULL if the end is not an unreachable block. */
5312 property_table_entry *ends_unreachable;
5316 enum ebb_target_enum
5319 EBB_DESIRE_TGT_ALIGN,
5320 EBB_REQUIRE_TGT_ALIGN,
5321 EBB_REQUIRE_LOOP_ALIGN,
5326 /* proposed_action_struct is similar to the text_action_struct except
5327 that is represents a potential transformation, not one that will
5328 occur. We build a list of these for an extended basic block
5329 and use them to compute the actual actions desired. We must be
5330 careful that the entire set of actual actions we perform do not
5331 break any relocations that would fit if the actions were not
5334 typedef struct proposed_action_struct proposed_action;
5336 struct proposed_action_struct
5338 enum ebb_target_enum align_type; /* for the target alignment */
5339 bfd_vma alignment_pow;
5340 text_action_t action;
5343 bfd_boolean do_action; /* If false, then we will not perform the action. */
5347 /* The ebb_constraint_struct keeps a set of proposed actions for an
5348 extended basic block. */
5350 typedef struct ebb_constraint_struct ebb_constraint;
5352 struct ebb_constraint_struct
5355 bfd_boolean start_movable;
5357 /* Bytes of extra space at the beginning if movable. */
5358 int start_extra_space;
5360 enum ebb_target_enum start_align;
5362 bfd_boolean end_movable;
5364 /* Bytes of extra space at the end if movable. */
5365 int end_extra_space;
5367 unsigned action_count;
5368 unsigned action_allocated;
5370 /* Array of proposed actions. */
5371 proposed_action *actions;
5373 /* Action alignments -- one for each proposed action. */
5374 enum ebb_target_enum *action_aligns;
5379 init_ebb_constraint (ebb_constraint *c)
5381 memset (c, 0, sizeof (ebb_constraint));
5386 free_ebb_constraint (ebb_constraint *c)
5394 init_ebb (ebb_t *ebb,
5397 bfd_size_type content_length,
5398 property_table_entry *prop_table,
5400 Elf_Internal_Rela *internal_relocs,
5401 unsigned reloc_count)
5403 memset (ebb, 0, sizeof (ebb_t));
5405 ebb->contents = contents;
5406 ebb->content_length = content_length;
5407 ebb->ptbl = prop_table;
5408 ebb->pte_count = ptblsize;
5409 ebb->relocs = internal_relocs;
5410 ebb->reloc_count = reloc_count;
5411 ebb->start_offset = 0;
5412 ebb->end_offset = ebb->content_length - 1;
5413 ebb->start_ptbl_idx = 0;
5414 ebb->end_ptbl_idx = ptblsize;
5415 ebb->start_reloc_idx = 0;
5416 ebb->end_reloc_idx = reloc_count;
5420 /* Extend the ebb to all decodable contiguous sections. The algorithm
5421 for building a basic block around an instruction is to push it
5422 forward until we hit the end of a section, an unreachable block or
5423 a block that cannot be transformed. Then we push it backwards
5424 searching for similar conditions. */
5426 static bfd_boolean extend_ebb_bounds_forward (ebb_t *);
5427 static bfd_boolean extend_ebb_bounds_backward (ebb_t *);
5428 static bfd_size_type insn_block_decodable_len
5429 (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type);
5432 extend_ebb_bounds (ebb_t *ebb)
5434 if (!extend_ebb_bounds_forward (ebb))
5436 if (!extend_ebb_bounds_backward (ebb))
5443 extend_ebb_bounds_forward (ebb_t *ebb)
5445 property_table_entry *the_entry, *new_entry;
5447 the_entry = &ebb->ptbl[ebb->end_ptbl_idx];
5449 /* Stop when (1) we cannot decode an instruction, (2) we are at
5450 the end of the property tables, (3) we hit a non-contiguous property
5451 table entry, (4) we hit a NO_TRANSFORM region. */
5456 bfd_size_type insn_block_len;
5458 entry_end = the_entry->address - ebb->sec->vma + the_entry->size;
5460 insn_block_decodable_len (ebb->contents, ebb->content_length,
5462 entry_end - ebb->end_offset);
5463 if (insn_block_len != (entry_end - ebb->end_offset))
5465 (*_bfd_error_handler)
5466 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5467 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5470 ebb->end_offset += insn_block_len;
5472 if (ebb->end_offset == ebb->sec->size)
5473 ebb->ends_section = TRUE;
5475 /* Update the reloc counter. */
5476 while (ebb->end_reloc_idx + 1 < ebb->reloc_count
5477 && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset
5480 ebb->end_reloc_idx++;
5483 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5486 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5487 if (((new_entry->flags & XTENSA_PROP_INSN) == 0)
5488 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5489 || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0))
5492 if (the_entry->address + the_entry->size != new_entry->address)
5495 the_entry = new_entry;
5496 ebb->end_ptbl_idx++;
5499 /* Quick check for an unreachable or end of file just at the end. */
5500 if (ebb->end_ptbl_idx + 1 == ebb->pte_count)
5502 if (ebb->end_offset == ebb->content_length)
5503 ebb->ends_section = TRUE;
5507 new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1];
5508 if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0
5509 && the_entry->address + the_entry->size == new_entry->address)
5510 ebb->ends_unreachable = new_entry;
5513 /* Any other ending requires exact alignment. */
5519 extend_ebb_bounds_backward (ebb_t *ebb)
5521 property_table_entry *the_entry, *new_entry;
5523 the_entry = &ebb->ptbl[ebb->start_ptbl_idx];
5525 /* Stop when (1) we cannot decode the instructions in the current entry.
5526 (2) we are at the beginning of the property tables, (3) we hit a
5527 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5531 bfd_vma block_begin;
5532 bfd_size_type insn_block_len;
5534 block_begin = the_entry->address - ebb->sec->vma;
5536 insn_block_decodable_len (ebb->contents, ebb->content_length,
5538 ebb->start_offset - block_begin);
5539 if (insn_block_len != ebb->start_offset - block_begin)
5541 (*_bfd_error_handler)
5542 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5543 ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len);
5546 ebb->start_offset -= insn_block_len;
5548 /* Update the reloc counter. */
5549 while (ebb->start_reloc_idx > 0
5550 && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset
5551 >= ebb->start_offset))
5553 ebb->start_reloc_idx--;
5556 if (ebb->start_ptbl_idx == 0)
5559 new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1];
5560 if ((new_entry->flags & XTENSA_PROP_INSN) == 0
5561 || ((new_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) != 0)
5562 || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0))
5564 if (new_entry->address + new_entry->size != the_entry->address)
5567 the_entry = new_entry;
5568 ebb->start_ptbl_idx--;
5574 static bfd_size_type
5575 insn_block_decodable_len (bfd_byte *contents,
5576 bfd_size_type content_len,
5577 bfd_vma block_offset,
5578 bfd_size_type block_len)
5580 bfd_vma offset = block_offset;
5582 while (offset < block_offset + block_len)
5584 bfd_size_type insn_len = 0;
5586 insn_len = insn_decode_len (contents, content_len, offset);
5588 return (offset - block_offset);
5591 return (offset - block_offset);
5596 ebb_propose_action (ebb_constraint *c,
5597 enum ebb_target_enum align_type,
5598 bfd_vma alignment_pow,
5599 text_action_t action,
5602 bfd_boolean do_action)
5604 proposed_action *act;
5606 if (c->action_allocated <= c->action_count)
5608 unsigned new_allocated, i;
5609 proposed_action *new_actions;
5611 new_allocated = (c->action_count + 2) * 2;
5612 new_actions = (proposed_action *)
5613 bfd_zmalloc (sizeof (proposed_action) * new_allocated);
5615 for (i = 0; i < c->action_count; i++)
5616 new_actions[i] = c->actions[i];
5619 c->actions = new_actions;
5620 c->action_allocated = new_allocated;
5623 act = &c->actions[c->action_count];
5624 act->align_type = align_type;
5625 act->alignment_pow = alignment_pow;
5626 act->action = action;
5627 act->offset = offset;
5628 act->removed_bytes = removed_bytes;
5629 act->do_action = do_action;
5635 /* Access to internal relocations, section contents and symbols. */
5637 /* During relaxation, we need to modify relocations, section contents,
5638 and symbol definitions, and we need to keep the original values from
5639 being reloaded from the input files, i.e., we need to "pin" the
5640 modified values in memory. We also want to continue to observe the
5641 setting of the "keep-memory" flag. The following functions wrap the
5642 standard BFD functions to take care of this for us. */
5644 static Elf_Internal_Rela *
5645 retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5647 Elf_Internal_Rela *internal_relocs;
5649 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5652 internal_relocs = elf_section_data (sec)->relocs;
5653 if (internal_relocs == NULL)
5654 internal_relocs = (_bfd_elf_link_read_relocs
5655 (abfd, sec, NULL, NULL, keep_memory));
5656 return internal_relocs;
5661 pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5663 elf_section_data (sec)->relocs = internal_relocs;
5668 release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs)
5671 && elf_section_data (sec)->relocs != internal_relocs)
5672 free (internal_relocs);
5677 retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory)
5680 bfd_size_type sec_size;
5682 sec_size = bfd_get_section_limit (abfd, sec);
5683 contents = elf_section_data (sec)->this_hdr.contents;
5685 if (contents == NULL && sec_size != 0)
5687 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
5694 elf_section_data (sec)->this_hdr.contents = contents;
5701 pin_contents (asection *sec, bfd_byte *contents)
5703 elf_section_data (sec)->this_hdr.contents = contents;
5708 release_contents (asection *sec, bfd_byte *contents)
5710 if (contents && elf_section_data (sec)->this_hdr.contents != contents)
5715 static Elf_Internal_Sym *
5716 retrieve_local_syms (bfd *input_bfd)
5718 Elf_Internal_Shdr *symtab_hdr;
5719 Elf_Internal_Sym *isymbuf;
5722 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5723 locsymcount = symtab_hdr->sh_info;
5725 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5726 if (isymbuf == NULL && locsymcount != 0)
5727 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
5730 /* Save the symbols for this input file so they won't be read again. */
5731 if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
5732 symtab_hdr->contents = (unsigned char *) isymbuf;
5738 /* Code for link-time relaxation. */
5740 /* Initialization for relaxation: */
5741 static bfd_boolean analyze_relocations (struct bfd_link_info *);
5742 static bfd_boolean find_relaxable_sections
5743 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
5744 static bfd_boolean collect_source_relocs
5745 (bfd *, asection *, struct bfd_link_info *);
5746 static bfd_boolean is_resolvable_asm_expansion
5747 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *,
5749 static Elf_Internal_Rela *find_associated_l32r_irel
5750 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *);
5751 static bfd_boolean compute_text_actions
5752 (bfd *, asection *, struct bfd_link_info *);
5753 static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *);
5754 static bfd_boolean compute_ebb_actions (ebb_constraint *);
5755 static bfd_boolean check_section_ebb_pcrels_fit
5756 (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *,
5757 const xtensa_opcode *);
5758 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5759 static void text_action_add_proposed
5760 (text_action_list *, const ebb_constraint *, asection *);
5761 static int compute_fill_extra_space (property_table_entry *);
5764 static bfd_boolean compute_removed_literals
5765 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5766 static Elf_Internal_Rela *get_irel_at_offset
5767 (asection *, Elf_Internal_Rela *, bfd_vma);
5768 static bfd_boolean is_removable_literal
5769 (const source_reloc *, int, const source_reloc *, int);
5770 static bfd_boolean remove_dead_literal
5771 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5772 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5773 static bfd_boolean identify_literal_placement
5774 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5775 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5776 source_reloc *, property_table_entry *, int, section_cache_t *,
5778 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5779 static bfd_boolean coalesce_shared_literal
5780 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5781 static bfd_boolean move_shared_literal
5782 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5783 int, const r_reloc *, const literal_value *, section_cache_t *);
5786 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5787 static bfd_boolean translate_section_fixes (asection *);
5788 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5789 static void translate_reloc (const r_reloc *, r_reloc *);
5790 static void shrink_dynamic_reloc_sections
5791 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5792 static bfd_boolean move_literal
5793 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5794 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5795 static bfd_boolean relax_property_section
5796 (bfd *, asection *, struct bfd_link_info *);
5799 static bfd_boolean relax_section_symbols (bfd *, asection *);
5803 elf_xtensa_relax_section (bfd *abfd,
5805 struct bfd_link_info *link_info,
5808 static value_map_hash_table *values = NULL;
5809 static bfd_boolean relocations_analyzed = FALSE;
5810 xtensa_relax_info *relax_info;
5812 if (!relocations_analyzed)
5814 /* Do some overall initialization for relaxation. */
5815 values = value_map_hash_table_init ();
5818 relaxing_section = TRUE;
5819 if (!analyze_relocations (link_info))
5821 relocations_analyzed = TRUE;
5825 /* Don't mess with linker-created sections. */
5826 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5829 relax_info = get_xtensa_relax_info (sec);
5830 BFD_ASSERT (relax_info != NULL);
5832 switch (relax_info->visited)
5835 /* Note: It would be nice to fold this pass into
5836 analyze_relocations, but it is important for this step that the
5837 sections be examined in link order. */
5838 if (!compute_removed_literals (abfd, sec, link_info, values))
5845 value_map_hash_table_delete (values);
5847 if (!relax_section (abfd, sec, link_info))
5853 if (!relax_section_symbols (abfd, sec))
5858 relax_info->visited++;
5863 /* Initialization for relaxation. */
5865 /* This function is called once at the start of relaxation. It scans
5866 all the input sections and marks the ones that are relaxable (i.e.,
5867 literal sections with L32R relocations against them), and then
5868 collects source_reloc information for all the relocations against
5869 those relaxable sections. During this process, it also detects
5870 longcalls, i.e., calls relaxed by the assembler into indirect
5871 calls, that can be optimized back into direct calls. Within each
5872 extended basic block (ebb) containing an optimized longcall, it
5873 computes a set of "text actions" that can be performed to remove
5874 the L32R associated with the longcall while optionally preserving
5875 branch target alignments. */
5878 analyze_relocations (struct bfd_link_info *link_info)
5882 bfd_boolean is_relaxable = FALSE;
5884 /* Initialize the per-section relaxation info. */
5885 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5886 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5888 init_xtensa_relax_info (sec);
5891 /* Mark relaxable sections (and count relocations against each one). */
5892 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5893 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5895 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5899 /* Bail out if there are no relaxable sections. */
5903 /* Allocate space for source_relocs. */
5904 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5905 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5907 xtensa_relax_info *relax_info;
5909 relax_info = get_xtensa_relax_info (sec);
5910 if (relax_info->is_relaxable_literal_section
5911 || relax_info->is_relaxable_asm_section)
5913 relax_info->src_relocs = (source_reloc *)
5914 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5917 relax_info->src_count = 0;
5920 /* Collect info on relocations against each relaxable section. */
5921 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5922 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5924 if (!collect_source_relocs (abfd, sec, link_info))
5928 /* Compute the text actions. */
5929 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5930 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5932 if (!compute_text_actions (abfd, sec, link_info))
5940 /* Find all the sections that might be relaxed. The motivation for
5941 this pass is that collect_source_relocs() needs to record _all_ the
5942 relocations that target each relaxable section. That is expensive
5943 and unnecessary unless the target section is actually going to be
5944 relaxed. This pass identifies all such sections by checking if
5945 they have L32Rs pointing to them. In the process, the total number
5946 of relocations targeting each section is also counted so that we
5947 know how much space to allocate for source_relocs against each
5948 relaxable literal section. */
5951 find_relaxable_sections (bfd *abfd,
5953 struct bfd_link_info *link_info,
5954 bfd_boolean *is_relaxable_p)
5956 Elf_Internal_Rela *internal_relocs;
5958 bfd_boolean ok = TRUE;
5960 xtensa_relax_info *source_relax_info;
5961 bfd_boolean is_l32r_reloc;
5963 internal_relocs = retrieve_internal_relocs (abfd, sec,
5964 link_info->keep_memory);
5965 if (internal_relocs == NULL)
5968 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5969 if (contents == NULL && sec->size != 0)
5975 source_relax_info = get_xtensa_relax_info (sec);
5976 for (i = 0; i < sec->reloc_count; i++)
5978 Elf_Internal_Rela *irel = &internal_relocs[i];
5980 asection *target_sec;
5981 xtensa_relax_info *target_relax_info;
5983 /* If this section has not already been marked as "relaxable", and
5984 if it contains any ASM_EXPAND relocations (marking expanded
5985 longcalls) that can be optimized into direct calls, then mark
5986 the section as "relaxable". */
5987 if (source_relax_info
5988 && !source_relax_info->is_relaxable_asm_section
5989 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
5991 bfd_boolean is_reachable = FALSE;
5992 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
5993 link_info, &is_reachable)
5996 source_relax_info->is_relaxable_asm_section = TRUE;
5997 *is_relaxable_p = TRUE;
6001 r_reloc_init (&r_rel, abfd, irel, contents,
6002 bfd_get_section_limit (abfd, sec));
6004 target_sec = r_reloc_get_section (&r_rel);
6005 target_relax_info = get_xtensa_relax_info (target_sec);
6006 if (!target_relax_info)
6009 /* Count PC-relative operand relocations against the target section.
6010 Note: The conditions tested here must match the conditions under
6011 which init_source_reloc is called in collect_source_relocs(). */
6012 is_l32r_reloc = FALSE;
6013 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6015 xtensa_opcode opcode =
6016 get_relocation_opcode (abfd, sec, contents, irel);
6017 if (opcode != XTENSA_UNDEFINED)
6019 is_l32r_reloc = (opcode == get_l32r_opcode ());
6020 if (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6022 target_relax_info->src_count++;
6026 if (is_l32r_reloc && r_reloc_is_defined (&r_rel))
6028 /* Mark the target section as relaxable. */
6029 target_relax_info->is_relaxable_literal_section = TRUE;
6030 *is_relaxable_p = TRUE;
6035 release_contents (sec, contents);
6036 release_internal_relocs (sec, internal_relocs);
6041 /* Record _all_ the relocations that point to relaxable sections, and
6042 get rid of ASM_EXPAND relocs by either converting them to
6043 ASM_SIMPLIFY or by removing them. */
6046 collect_source_relocs (bfd *abfd,
6048 struct bfd_link_info *link_info)
6050 Elf_Internal_Rela *internal_relocs;
6052 bfd_boolean ok = TRUE;
6054 bfd_size_type sec_size;
6056 internal_relocs = retrieve_internal_relocs (abfd, sec,
6057 link_info->keep_memory);
6058 if (internal_relocs == NULL)
6061 sec_size = bfd_get_section_limit (abfd, sec);
6062 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6063 if (contents == NULL && sec_size != 0)
6069 /* Record relocations against relaxable literal sections. */
6070 for (i = 0; i < sec->reloc_count; i++)
6072 Elf_Internal_Rela *irel = &internal_relocs[i];
6074 asection *target_sec;
6075 xtensa_relax_info *target_relax_info;
6077 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6079 target_sec = r_reloc_get_section (&r_rel);
6080 target_relax_info = get_xtensa_relax_info (target_sec);
6082 if (target_relax_info
6083 && (target_relax_info->is_relaxable_literal_section
6084 || target_relax_info->is_relaxable_asm_section))
6086 xtensa_opcode opcode = XTENSA_UNDEFINED;
6088 bfd_boolean is_abs_literal = FALSE;
6090 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6092 /* None of the current alternate relocs are PC-relative,
6093 and only PC-relative relocs matter here. However, we
6094 still need to record the opcode for literal
6096 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6097 if (opcode == get_l32r_opcode ())
6099 is_abs_literal = TRUE;
6103 opcode = XTENSA_UNDEFINED;
6105 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6107 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6108 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6111 if (opcode != XTENSA_UNDEFINED)
6113 int src_next = target_relax_info->src_next++;
6114 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6116 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6122 /* Now get rid of ASM_EXPAND relocations. At this point, the
6123 src_relocs array for the target literal section may still be
6124 incomplete, but it must at least contain the entries for the L32R
6125 relocations associated with ASM_EXPANDs because they were just
6126 added in the preceding loop over the relocations. */
6128 for (i = 0; i < sec->reloc_count; i++)
6130 Elf_Internal_Rela *irel = &internal_relocs[i];
6131 bfd_boolean is_reachable;
6133 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6139 Elf_Internal_Rela *l32r_irel;
6141 asection *target_sec;
6142 xtensa_relax_info *target_relax_info;
6144 /* Mark the source_reloc for the L32R so that it will be
6145 removed in compute_removed_literals(), along with the
6146 associated literal. */
6147 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6148 irel, internal_relocs);
6149 if (l32r_irel == NULL)
6152 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6154 target_sec = r_reloc_get_section (&r_rel);
6155 target_relax_info = get_xtensa_relax_info (target_sec);
6157 if (target_relax_info
6158 && (target_relax_info->is_relaxable_literal_section
6159 || target_relax_info->is_relaxable_asm_section))
6161 source_reloc *s_reloc;
6163 /* Search the source_relocs for the entry corresponding to
6164 the l32r_irel. Note: The src_relocs array is not yet
6165 sorted, but it wouldn't matter anyway because we're
6166 searching by source offset instead of target offset. */
6167 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6168 target_relax_info->src_next,
6170 BFD_ASSERT (s_reloc);
6171 s_reloc->is_null = TRUE;
6174 /* Convert this reloc to ASM_SIMPLIFY. */
6175 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6176 R_XTENSA_ASM_SIMPLIFY);
6177 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6179 pin_internal_relocs (sec, internal_relocs);
6183 /* It is resolvable but doesn't reach. We resolve now
6184 by eliminating the relocation -- the call will remain
6185 expanded into L32R/CALLX. */
6186 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6187 pin_internal_relocs (sec, internal_relocs);
6192 release_contents (sec, contents);
6193 release_internal_relocs (sec, internal_relocs);
6198 /* Return TRUE if the asm expansion can be resolved. Generally it can
6199 be resolved on a final link or when a partial link locates it in the
6200 same section as the target. Set "is_reachable" flag if the target of
6201 the call is within the range of a direct call, given the current VMA
6202 for this section and the target section. */
6205 is_resolvable_asm_expansion (bfd *abfd,
6208 Elf_Internal_Rela *irel,
6209 struct bfd_link_info *link_info,
6210 bfd_boolean *is_reachable_p)
6212 asection *target_sec;
6213 bfd_vma target_offset;
6215 xtensa_opcode opcode, direct_call_opcode;
6216 bfd_vma self_address;
6217 bfd_vma dest_address;
6218 bfd_boolean uses_l32r;
6219 bfd_size_type sec_size;
6221 *is_reachable_p = FALSE;
6223 if (contents == NULL)
6226 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6229 sec_size = bfd_get_section_limit (abfd, sec);
6230 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6231 sec_size - irel->r_offset, &uses_l32r);
6232 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6236 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6237 if (direct_call_opcode == XTENSA_UNDEFINED)
6240 /* Check and see that the target resolves. */
6241 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6242 if (!r_reloc_is_defined (&r_rel))
6245 target_sec = r_reloc_get_section (&r_rel);
6246 target_offset = r_rel.target_offset;
6248 /* If the target is in a shared library, then it doesn't reach. This
6249 isn't supposed to come up because the compiler should never generate
6250 non-PIC calls on systems that use shared libraries, but the linker
6251 shouldn't crash regardless. */
6252 if (!target_sec->output_section)
6255 /* For relocatable sections, we can only simplify when the output
6256 section of the target is the same as the output section of the
6258 if (link_info->relocatable
6259 && (target_sec->output_section != sec->output_section
6260 || is_reloc_sym_weak (abfd, irel)))
6263 self_address = (sec->output_section->vma
6264 + sec->output_offset + irel->r_offset + 3);
6265 dest_address = (target_sec->output_section->vma
6266 + target_sec->output_offset + target_offset);
6268 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6269 self_address, dest_address);
6271 if ((self_address >> CALL_SEGMENT_BITS) !=
6272 (dest_address >> CALL_SEGMENT_BITS))
6279 static Elf_Internal_Rela *
6280 find_associated_l32r_irel (bfd *abfd,
6283 Elf_Internal_Rela *other_irel,
6284 Elf_Internal_Rela *internal_relocs)
6288 for (i = 0; i < sec->reloc_count; i++)
6290 Elf_Internal_Rela *irel = &internal_relocs[i];
6292 if (irel == other_irel)
6294 if (irel->r_offset != other_irel->r_offset)
6296 if (is_l32r_relocation (abfd, sec, contents, irel))
6304 static xtensa_opcode *
6305 build_reloc_opcodes (bfd *abfd,
6308 Elf_Internal_Rela *internal_relocs)
6311 xtensa_opcode *reloc_opcodes =
6312 (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count);
6313 for (i = 0; i < sec->reloc_count; i++)
6315 Elf_Internal_Rela *irel = &internal_relocs[i];
6316 reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel);
6318 return reloc_opcodes;
6322 /* The compute_text_actions function will build a list of potential
6323 transformation actions for code in the extended basic block of each
6324 longcall that is optimized to a direct call. From this list we
6325 generate a set of actions to actually perform that optimizes for
6326 space and, if not using size_opt, maintains branch target
6329 These actions to be performed are placed on a per-section list.
6330 The actual changes are performed by relax_section() in the second
6334 compute_text_actions (bfd *abfd,
6336 struct bfd_link_info *link_info)
6338 xtensa_opcode *reloc_opcodes = NULL;
6339 xtensa_relax_info *relax_info;
6341 Elf_Internal_Rela *internal_relocs;
6342 bfd_boolean ok = TRUE;
6344 property_table_entry *prop_table = 0;
6346 bfd_size_type sec_size;
6348 relax_info = get_xtensa_relax_info (sec);
6349 BFD_ASSERT (relax_info);
6350 BFD_ASSERT (relax_info->src_next == relax_info->src_count);
6352 /* Do nothing if the section contains no optimized longcalls. */
6353 if (!relax_info->is_relaxable_asm_section)
6356 internal_relocs = retrieve_internal_relocs (abfd, sec,
6357 link_info->keep_memory);
6359 if (internal_relocs)
6360 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6361 internal_reloc_compare);
6363 sec_size = bfd_get_section_limit (abfd, sec);
6364 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6365 if (contents == NULL && sec_size != 0)
6371 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6372 XTENSA_PROP_SEC_NAME, FALSE);
6379 for (i = 0; i < sec->reloc_count; i++)
6381 Elf_Internal_Rela *irel = &internal_relocs[i];
6383 property_table_entry *the_entry;
6386 ebb_constraint ebb_table;
6387 bfd_size_type simplify_size;
6389 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6391 r_offset = irel->r_offset;
6393 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6394 if (simplify_size == 0)
6396 (*_bfd_error_handler)
6397 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6398 sec->owner, sec, r_offset);
6402 /* If the instruction table is not around, then don't do this
6404 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6405 sec->vma + irel->r_offset);
6406 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6408 text_action_add (&relax_info->action_list,
6409 ta_convert_longcall, sec, r_offset,
6414 /* If the next longcall happens to be at the same address as an
6415 unreachable section of size 0, then skip forward. */
6416 ptbl_idx = the_entry - prop_table;
6417 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6418 && the_entry->size == 0
6419 && ptbl_idx + 1 < ptblsize
6420 && (prop_table[ptbl_idx + 1].address
6421 == prop_table[ptbl_idx].address))
6427 if (the_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM)
6428 /* NO_REORDER is OK */
6431 init_ebb_constraint (&ebb_table);
6432 ebb = &ebb_table.ebb;
6433 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6434 internal_relocs, sec->reloc_count);
6435 ebb->start_offset = r_offset + simplify_size;
6436 ebb->end_offset = r_offset + simplify_size;
6437 ebb->start_ptbl_idx = ptbl_idx;
6438 ebb->end_ptbl_idx = ptbl_idx;
6439 ebb->start_reloc_idx = i;
6440 ebb->end_reloc_idx = i;
6442 /* Precompute the opcode for each relocation. */
6443 if (reloc_opcodes == NULL)
6444 reloc_opcodes = build_reloc_opcodes (abfd, sec, contents,
6447 if (!extend_ebb_bounds (ebb)
6448 || !compute_ebb_proposed_actions (&ebb_table)
6449 || !compute_ebb_actions (&ebb_table)
6450 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6451 internal_relocs, &ebb_table,
6453 || !check_section_ebb_reduces (&ebb_table))
6455 /* If anything goes wrong or we get unlucky and something does
6456 not fit, with our plan because of expansion between
6457 critical branches, just convert to a NOP. */
6459 text_action_add (&relax_info->action_list,
6460 ta_convert_longcall, sec, r_offset, 0);
6461 i = ebb_table.ebb.end_reloc_idx;
6462 free_ebb_constraint (&ebb_table);
6466 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6468 /* Update the index so we do not go looking at the relocations
6469 we have already processed. */
6470 i = ebb_table.ebb.end_reloc_idx;
6471 free_ebb_constraint (&ebb_table);
6475 if (relax_info->action_list.head)
6476 print_action_list (stderr, &relax_info->action_list);
6480 release_contents (sec, contents);
6481 release_internal_relocs (sec, internal_relocs);
6485 free (reloc_opcodes);
6491 /* Do not widen an instruction if it is preceeded by a
6492 loop opcode. It might cause misalignment. */
6495 prev_instr_is_a_loop (bfd_byte *contents,
6496 bfd_size_type content_length,
6497 bfd_size_type offset)
6499 xtensa_opcode prev_opcode;
6503 prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0);
6504 return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1);
6508 /* Find all of the possible actions for an extended basic block. */
6511 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6513 const ebb_t *ebb = &ebb_table->ebb;
6514 unsigned rel_idx = ebb->start_reloc_idx;
6515 property_table_entry *entry, *start_entry, *end_entry;
6517 xtensa_isa isa = xtensa_default_isa;
6519 static xtensa_insnbuf insnbuf = NULL;
6520 static xtensa_insnbuf slotbuf = NULL;
6522 if (insnbuf == NULL)
6524 insnbuf = xtensa_insnbuf_alloc (isa);
6525 slotbuf = xtensa_insnbuf_alloc (isa);
6528 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6529 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6531 for (entry = start_entry; entry <= end_entry; entry++)
6533 bfd_vma start_offset, end_offset;
6534 bfd_size_type insn_len;
6536 start_offset = entry->address - ebb->sec->vma;
6537 end_offset = entry->address + entry->size - ebb->sec->vma;
6539 if (entry == start_entry)
6540 start_offset = ebb->start_offset;
6541 if (entry == end_entry)
6542 end_offset = ebb->end_offset;
6543 offset = start_offset;
6545 if (offset == entry->address - ebb->sec->vma
6546 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6548 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6549 BFD_ASSERT (offset != end_offset);
6550 if (offset == end_offset)
6553 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6558 if (check_branch_target_aligned_address (offset, insn_len))
6559 align_type = EBB_REQUIRE_TGT_ALIGN;
6561 ebb_propose_action (ebb_table, align_type, 0,
6562 ta_none, offset, 0, TRUE);
6565 while (offset != end_offset)
6567 Elf_Internal_Rela *irel;
6568 xtensa_opcode opcode;
6570 while (rel_idx < ebb->end_reloc_idx
6571 && (ebb->relocs[rel_idx].r_offset < offset
6572 || (ebb->relocs[rel_idx].r_offset == offset
6573 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6574 != R_XTENSA_ASM_SIMPLIFY))))
6577 /* Check for longcall. */
6578 irel = &ebb->relocs[rel_idx];
6579 if (irel->r_offset == offset
6580 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6582 bfd_size_type simplify_size;
6584 simplify_size = get_asm_simplify_size (ebb->contents,
6585 ebb->content_length,
6587 if (simplify_size == 0)
6590 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6591 ta_convert_longcall, offset, 0, TRUE);
6593 offset += simplify_size;
6597 if (offset + MIN_INSN_LENGTH > ebb->content_length)
6599 xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset],
6600 ebb->content_length - offset);
6601 fmt = xtensa_format_decode (isa, insnbuf);
6602 if (fmt == XTENSA_UNDEFINED)
6604 insn_len = xtensa_format_length (isa, fmt);
6605 if (insn_len == (bfd_size_type) XTENSA_UNDEFINED)
6608 if (xtensa_format_num_slots (isa, fmt) != 1)
6614 xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf);
6615 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
6616 if (opcode == XTENSA_UNDEFINED)
6619 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6620 && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6621 && can_narrow_instruction (slotbuf, fmt, opcode) != 0)
6623 /* Add an instruction narrow action. */
6624 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6625 ta_narrow_insn, offset, 0, FALSE);
6627 else if ((entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6628 && can_widen_instruction (slotbuf, fmt, opcode) != 0
6629 && ! prev_instr_is_a_loop (ebb->contents,
6630 ebb->content_length, offset))
6632 /* Add an instruction widen action. */
6633 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6634 ta_widen_insn, offset, 0, FALSE);
6636 else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1)
6638 /* Check for branch targets. */
6639 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6640 ta_none, offset, 0, TRUE);
6647 if (ebb->ends_unreachable)
6649 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6650 ta_fill, ebb->end_offset, 0, TRUE);
6656 (*_bfd_error_handler)
6657 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6658 ebb->sec->owner, ebb->sec, offset);
6663 /* After all of the information has collected about the
6664 transformations possible in an EBB, compute the appropriate actions
6665 here in compute_ebb_actions. We still must check later to make
6666 sure that the actions do not break any relocations. The algorithm
6667 used here is pretty greedy. Basically, it removes as many no-ops
6668 as possible so that the end of the EBB has the same alignment
6669 characteristics as the original. First, it uses narrowing, then
6670 fill space at the end of the EBB, and finally widenings. If that
6671 does not work, it tries again with one fewer no-op removed. The
6672 optimization will only be performed if all of the branch targets
6673 that were aligned before transformation are also aligned after the
6676 When the size_opt flag is set, ignore the branch target alignments,
6677 narrow all wide instructions, and remove all no-ops unless the end
6678 of the EBB prevents it. */
6681 compute_ebb_actions (ebb_constraint *ebb_table)
6685 int removed_bytes = 0;
6686 ebb_t *ebb = &ebb_table->ebb;
6687 unsigned seg_idx_start = 0;
6688 unsigned seg_idx_end = 0;
6690 /* We perform this like the assembler relaxation algorithm: Start by
6691 assuming all instructions are narrow and all no-ops removed; then
6694 /* For each segment of this that has a solid constraint, check to
6695 see if there are any combinations that will keep the constraint.
6697 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6699 bfd_boolean requires_text_end_align = FALSE;
6700 unsigned longcall_count = 0;
6701 unsigned longcall_convert_count = 0;
6702 unsigned narrowable_count = 0;
6703 unsigned narrowable_convert_count = 0;
6704 unsigned widenable_count = 0;
6705 unsigned widenable_convert_count = 0;
6707 proposed_action *action = NULL;
6708 int align = (1 << ebb_table->ebb.sec->alignment_power);
6710 seg_idx_start = seg_idx_end;
6712 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6714 action = &ebb_table->actions[i];
6715 if (action->action == ta_convert_longcall)
6717 if (action->action == ta_narrow_insn)
6719 if (action->action == ta_widen_insn)
6721 if (action->action == ta_fill)
6723 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6725 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6726 && !elf32xtensa_size_opt)
6731 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6732 requires_text_end_align = TRUE;
6734 if (elf32xtensa_size_opt && !requires_text_end_align
6735 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6736 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6738 longcall_convert_count = longcall_count;
6739 narrowable_convert_count = narrowable_count;
6740 widenable_convert_count = 0;
6744 /* There is a constraint. Convert the max number of longcalls. */
6745 narrowable_convert_count = 0;
6746 longcall_convert_count = 0;
6747 widenable_convert_count = 0;
6749 for (j = 0; j < longcall_count; j++)
6751 int removed = (longcall_count - j) * 3 & (align - 1);
6752 unsigned desire_narrow = (align - removed) & (align - 1);
6753 unsigned desire_widen = removed;
6754 if (desire_narrow <= narrowable_count)
6756 narrowable_convert_count = desire_narrow;
6757 narrowable_convert_count +=
6758 (align * ((narrowable_count - narrowable_convert_count)
6760 longcall_convert_count = (longcall_count - j);
6761 widenable_convert_count = 0;
6764 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6766 narrowable_convert_count = 0;
6767 longcall_convert_count = longcall_count - j;
6768 widenable_convert_count = desire_widen;
6774 /* Now the number of conversions are saved. Do them. */
6775 for (i = seg_idx_start; i < seg_idx_end; i++)
6777 action = &ebb_table->actions[i];
6778 switch (action->action)
6780 case ta_convert_longcall:
6781 if (longcall_convert_count != 0)
6783 action->action = ta_remove_longcall;
6784 action->do_action = TRUE;
6785 action->removed_bytes += 3;
6786 longcall_convert_count--;
6789 case ta_narrow_insn:
6790 if (narrowable_convert_count != 0)
6792 action->do_action = TRUE;
6793 action->removed_bytes += 1;
6794 narrowable_convert_count--;
6798 if (widenable_convert_count != 0)
6800 action->do_action = TRUE;
6801 action->removed_bytes -= 1;
6802 widenable_convert_count--;
6811 /* Now we move on to some local opts. Try to remove each of the
6812 remaining longcalls. */
6814 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6817 for (i = 0; i < ebb_table->action_count; i++)
6819 int old_removed_bytes = removed_bytes;
6820 proposed_action *action = &ebb_table->actions[i];
6822 if (action->do_action && action->action == ta_convert_longcall)
6824 bfd_boolean bad_alignment = FALSE;
6826 for (j = i + 1; j < ebb_table->action_count; j++)
6828 proposed_action *new_action = &ebb_table->actions[j];
6829 bfd_vma offset = new_action->offset;
6830 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6832 if (!check_branch_target_aligned
6833 (ebb_table->ebb.contents,
6834 ebb_table->ebb.content_length,
6835 offset, offset - removed_bytes))
6837 bad_alignment = TRUE;
6841 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6843 if (!check_loop_aligned (ebb_table->ebb.contents,
6844 ebb_table->ebb.content_length,
6846 offset - removed_bytes))
6848 bad_alignment = TRUE;
6852 if (new_action->action == ta_narrow_insn
6853 && !new_action->do_action
6854 && ebb_table->ebb.sec->alignment_power == 2)
6856 /* Narrow an instruction and we are done. */
6857 new_action->do_action = TRUE;
6858 new_action->removed_bytes += 1;
6859 bad_alignment = FALSE;
6862 if (new_action->action == ta_widen_insn
6863 && new_action->do_action
6864 && ebb_table->ebb.sec->alignment_power == 2)
6866 /* Narrow an instruction and we are done. */
6867 new_action->do_action = FALSE;
6868 new_action->removed_bytes += 1;
6869 bad_alignment = FALSE;
6875 action->removed_bytes += 3;
6876 action->action = ta_remove_longcall;
6877 action->do_action = TRUE;
6880 removed_bytes = old_removed_bytes;
6881 if (action->do_action)
6882 removed_bytes += action->removed_bytes;
6887 for (i = 0; i < ebb_table->action_count; ++i)
6889 proposed_action *action = &ebb_table->actions[i];
6890 if (action->do_action)
6891 removed_bytes += action->removed_bytes;
6894 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6895 && ebb->ends_unreachable)
6897 proposed_action *action;
6901 BFD_ASSERT (ebb_table->action_count != 0);
6902 action = &ebb_table->actions[ebb_table->action_count - 1];
6903 BFD_ASSERT (action->action == ta_fill);
6904 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6906 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6907 br = action->removed_bytes + removed_bytes + extra_space;
6908 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6910 action->removed_bytes = extra_space - br;
6916 /* The xlate_map is a sorted array of address mappings designed to
6917 answer the offset_with_removed_text() query with a binary search instead
6918 of a linear search through the section's action_list. */
6920 typedef struct xlate_map_entry xlate_map_entry_t;
6921 typedef struct xlate_map xlate_map_t;
6923 struct xlate_map_entry
6925 unsigned orig_address;
6926 unsigned new_address;
6932 unsigned entry_count;
6933 xlate_map_entry_t *entry;
6938 xlate_compare (const void *a_v, const void *b_v)
6940 const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v;
6941 const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v;
6942 if (a->orig_address < b->orig_address)
6944 if (a->orig_address > (b->orig_address + b->size - 1))
6951 xlate_offset_with_removed_text (const xlate_map_t *map,
6952 text_action_list *action_list,
6955 xlate_map_entry_t tmp;
6957 xlate_map_entry_t *e;
6960 return offset_with_removed_text (action_list, offset);
6962 if (map->entry_count == 0)
6965 tmp.orig_address = offset;
6966 tmp.new_address = offset;
6969 r = bsearch (&offset, map->entry, map->entry_count,
6970 sizeof (xlate_map_entry_t), &xlate_compare);
6971 e = (xlate_map_entry_t *) r;
6973 BFD_ASSERT (e != NULL);
6976 return e->new_address - e->orig_address + offset;
6980 /* Build a binary searchable offset translation map from a section's
6983 static xlate_map_t *
6984 build_xlate_map (asection *sec, xtensa_relax_info *relax_info)
6986 xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t));
6987 text_action_list *action_list = &relax_info->action_list;
6988 unsigned num_actions = 0;
6991 xlate_map_entry_t *current_entry;
6996 num_actions = action_list_count (action_list);
6997 map->entry = (xlate_map_entry_t *)
6998 bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1));
6999 if (map->entry == NULL)
7004 map->entry_count = 0;
7007 current_entry = &map->entry[0];
7009 current_entry->orig_address = 0;
7010 current_entry->new_address = 0;
7011 current_entry->size = 0;
7013 for (r = action_list->head; r != NULL; r = r->next)
7015 unsigned orig_size = 0;
7019 case ta_remove_insn:
7020 case ta_convert_longcall:
7021 case ta_remove_literal:
7022 case ta_add_literal:
7024 case ta_remove_longcall:
7027 case ta_narrow_insn:
7036 current_entry->size =
7037 r->offset + orig_size - current_entry->orig_address;
7038 if (current_entry->size != 0)
7043 current_entry->orig_address = r->offset + orig_size;
7044 removed += r->removed_bytes;
7045 current_entry->new_address = r->offset + orig_size - removed;
7046 current_entry->size = 0;
7049 current_entry->size = (bfd_get_section_limit (sec->owner, sec)
7050 - current_entry->orig_address);
7051 if (current_entry->size != 0)
7058 /* Free an offset translation map. */
7061 free_xlate_map (xlate_map_t *map)
7063 if (map && map->entry)
7070 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7071 relocations in a section will fit if a proposed set of actions
7075 check_section_ebb_pcrels_fit (bfd *abfd,
7078 Elf_Internal_Rela *internal_relocs,
7079 const ebb_constraint *constraint,
7080 const xtensa_opcode *reloc_opcodes)
7083 Elf_Internal_Rela *irel;
7084 xlate_map_t *xmap = NULL;
7085 bfd_boolean ok = TRUE;
7086 xtensa_relax_info *relax_info;
7088 relax_info = get_xtensa_relax_info (sec);
7090 if (relax_info && sec->reloc_count > 100)
7092 xmap = build_xlate_map (sec, relax_info);
7093 /* NULL indicates out of memory, but the slow version
7094 can still be used. */
7097 for (i = 0; i < sec->reloc_count; i++)
7100 bfd_vma orig_self_offset, orig_target_offset;
7101 bfd_vma self_offset, target_offset;
7103 reloc_howto_type *howto;
7104 int self_removed_bytes, target_removed_bytes;
7106 irel = &internal_relocs[i];
7107 r_type = ELF32_R_TYPE (irel->r_info);
7109 howto = &elf_howto_table[r_type];
7110 /* We maintain the required invariant: PC-relative relocations
7111 that fit before linking must fit after linking. Thus we only
7112 need to deal with relocations to the same section that are
7114 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
7115 || !howto->pc_relative)
7118 r_reloc_init (&r_rel, abfd, irel, contents,
7119 bfd_get_section_limit (abfd, sec));
7121 if (r_reloc_get_section (&r_rel) != sec)
7124 orig_self_offset = irel->r_offset;
7125 orig_target_offset = r_rel.target_offset;
7127 self_offset = orig_self_offset;
7128 target_offset = orig_target_offset;
7133 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7136 xlate_offset_with_removed_text (xmap, &relax_info->action_list,
7137 orig_target_offset);
7140 self_removed_bytes = 0;
7141 target_removed_bytes = 0;
7143 for (j = 0; j < constraint->action_count; ++j)
7145 proposed_action *action = &constraint->actions[j];
7146 bfd_vma offset = action->offset;
7147 int removed_bytes = action->removed_bytes;
7148 if (offset < orig_self_offset
7149 || (offset == orig_self_offset && action->action == ta_fill
7150 && action->removed_bytes < 0))
7151 self_removed_bytes += removed_bytes;
7152 if (offset < orig_target_offset
7153 || (offset == orig_target_offset && action->action == ta_fill
7154 && action->removed_bytes < 0))
7155 target_removed_bytes += removed_bytes;
7157 self_offset -= self_removed_bytes;
7158 target_offset -= target_removed_bytes;
7160 /* Try to encode it. Get the operand and check. */
7161 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
7163 /* None of the current alternate relocs are PC-relative,
7164 and only PC-relative relocs matter here. */
7168 xtensa_opcode opcode;
7172 opcode = reloc_opcodes[i];
7174 opcode = get_relocation_opcode (abfd, sec, contents, irel);
7175 if (opcode == XTENSA_UNDEFINED)
7181 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
7182 if (opnum == XTENSA_UNDEFINED)
7188 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
7197 free_xlate_map (xmap);
7204 check_section_ebb_reduces (const ebb_constraint *constraint)
7209 for (i = 0; i < constraint->action_count; i++)
7211 const proposed_action *action = &constraint->actions[i];
7212 if (action->do_action)
7213 removed += action->removed_bytes;
7223 text_action_add_proposed (text_action_list *l,
7224 const ebb_constraint *ebb_table,
7229 for (i = 0; i < ebb_table->action_count; i++)
7231 proposed_action *action = &ebb_table->actions[i];
7233 if (!action->do_action)
7235 switch (action->action)
7237 case ta_remove_insn:
7238 case ta_remove_longcall:
7239 case ta_convert_longcall:
7240 case ta_narrow_insn:
7243 case ta_remove_literal:
7244 text_action_add (l, action->action, sec, action->offset,
7245 action->removed_bytes);
7258 compute_fill_extra_space (property_table_entry *entry)
7260 int fill_extra_space;
7265 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7268 fill_extra_space = entry->size;
7269 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7271 /* Fill bytes for alignment:
7272 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7273 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7274 int nsm = (1 << pow) - 1;
7275 bfd_vma addr = entry->address + entry->size;
7276 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7277 fill_extra_space += align_fill;
7279 return fill_extra_space;
7283 /* First relaxation pass. */
7285 /* If the section contains relaxable literals, check each literal to
7286 see if it has the same value as another literal that has already
7287 been seen, either in the current section or a previous one. If so,
7288 add an entry to the per-section list of removed literals. The
7289 actual changes are deferred until the next pass. */
7292 compute_removed_literals (bfd *abfd,
7294 struct bfd_link_info *link_info,
7295 value_map_hash_table *values)
7297 xtensa_relax_info *relax_info;
7299 Elf_Internal_Rela *internal_relocs;
7300 source_reloc *src_relocs, *rel;
7301 bfd_boolean ok = TRUE;
7302 property_table_entry *prop_table = NULL;
7305 bfd_boolean last_loc_is_prev = FALSE;
7306 bfd_vma last_target_offset = 0;
7307 section_cache_t target_sec_cache;
7308 bfd_size_type sec_size;
7310 init_section_cache (&target_sec_cache);
7312 /* Do nothing if it is not a relaxable literal section. */
7313 relax_info = get_xtensa_relax_info (sec);
7314 BFD_ASSERT (relax_info);
7315 if (!relax_info->is_relaxable_literal_section)
7318 internal_relocs = retrieve_internal_relocs (abfd, sec,
7319 link_info->keep_memory);
7321 sec_size = bfd_get_section_limit (abfd, sec);
7322 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7323 if (contents == NULL && sec_size != 0)
7329 /* Sort the source_relocs by target offset. */
7330 src_relocs = relax_info->src_relocs;
7331 qsort (src_relocs, relax_info->src_count,
7332 sizeof (source_reloc), source_reloc_compare);
7333 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7334 internal_reloc_compare);
7336 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7337 XTENSA_PROP_SEC_NAME, FALSE);
7345 for (i = 0; i < relax_info->src_count; i++)
7347 Elf_Internal_Rela *irel = NULL;
7349 rel = &src_relocs[i];
7350 if (get_l32r_opcode () != rel->opcode)
7352 irel = get_irel_at_offset (sec, internal_relocs,
7353 rel->r_rel.target_offset);
7355 /* If the relocation on this is not a simple R_XTENSA_32 or
7356 R_XTENSA_PLT then do not consider it. This may happen when
7357 the difference of two symbols is used in a literal. */
7358 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7359 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7362 /* If the target_offset for this relocation is the same as the
7363 previous relocation, then we've already considered whether the
7364 literal can be coalesced. Skip to the next one.... */
7365 if (i != 0 && prev_i != -1
7366 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7370 if (last_loc_is_prev &&
7371 last_target_offset + 4 != rel->r_rel.target_offset)
7372 last_loc_is_prev = FALSE;
7374 /* Check if the relocation was from an L32R that is being removed
7375 because a CALLX was converted to a direct CALL, and check if
7376 there are no other relocations to the literal. */
7377 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count))
7379 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7380 irel, rel, prop_table, ptblsize))
7385 last_target_offset = rel->r_rel.target_offset;
7389 if (!identify_literal_placement (abfd, sec, contents, link_info,
7391 &last_loc_is_prev, irel,
7392 relax_info->src_count - i, rel,
7393 prop_table, ptblsize,
7394 &target_sec_cache, rel->is_abs_literal))
7399 last_target_offset = rel->r_rel.target_offset;
7403 print_removed_literals (stderr, &relax_info->removed_list);
7404 print_action_list (stderr, &relax_info->action_list);
7408 if (prop_table) free (prop_table);
7409 clear_section_cache (&target_sec_cache);
7411 release_contents (sec, contents);
7412 release_internal_relocs (sec, internal_relocs);
7417 static Elf_Internal_Rela *
7418 get_irel_at_offset (asection *sec,
7419 Elf_Internal_Rela *internal_relocs,
7423 Elf_Internal_Rela *irel;
7425 Elf_Internal_Rela key;
7427 if (!internal_relocs)
7430 key.r_offset = offset;
7431 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7432 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7436 /* bsearch does not guarantee which will be returned if there are
7437 multiple matches. We need the first that is not an alignment. */
7438 i = irel - internal_relocs;
7441 if (internal_relocs[i-1].r_offset != offset)
7445 for ( ; i < sec->reloc_count; i++)
7447 irel = &internal_relocs[i];
7448 r_type = ELF32_R_TYPE (irel->r_info);
7449 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7458 is_removable_literal (const source_reloc *rel,
7460 const source_reloc *src_relocs,
7463 const source_reloc *curr_rel;
7467 for (++i; i < src_count; ++i)
7469 curr_rel = &src_relocs[i];
7470 /* If all others have the same target offset.... */
7471 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7474 if (!curr_rel->is_null
7475 && !xtensa_is_property_section (curr_rel->source_sec)
7476 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7484 remove_dead_literal (bfd *abfd,
7486 struct bfd_link_info *link_info,
7487 Elf_Internal_Rela *internal_relocs,
7488 Elf_Internal_Rela *irel,
7490 property_table_entry *prop_table,
7493 property_table_entry *entry;
7494 xtensa_relax_info *relax_info;
7496 relax_info = get_xtensa_relax_info (sec);
7500 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7501 sec->vma + rel->r_rel.target_offset);
7503 /* Mark the unused literal so that it will be removed. */
7504 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7506 text_action_add (&relax_info->action_list,
7507 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7509 /* If the section is 4-byte aligned, do not add fill. */
7510 if (sec->alignment_power > 2)
7512 int fill_extra_space;
7513 bfd_vma entry_sec_offset;
7515 property_table_entry *the_add_entry;
7519 entry_sec_offset = entry->address - sec->vma + entry->size;
7521 entry_sec_offset = rel->r_rel.target_offset + 4;
7523 /* If the literal range is at the end of the section,
7525 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7527 fill_extra_space = compute_fill_extra_space (the_add_entry);
7529 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7530 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7531 -4, fill_extra_space);
7533 adjust_fill_action (fa, removed_diff);
7535 text_action_add (&relax_info->action_list,
7536 ta_fill, sec, entry_sec_offset, removed_diff);
7539 /* Zero out the relocation on this literal location. */
7542 if (elf_hash_table (link_info)->dynamic_sections_created)
7543 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7545 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7546 pin_internal_relocs (sec, internal_relocs);
7549 /* Do not modify "last_loc_is_prev". */
7555 identify_literal_placement (bfd *abfd,
7558 struct bfd_link_info *link_info,
7559 value_map_hash_table *values,
7560 bfd_boolean *last_loc_is_prev_p,
7561 Elf_Internal_Rela *irel,
7562 int remaining_src_rels,
7564 property_table_entry *prop_table,
7566 section_cache_t *target_sec_cache,
7567 bfd_boolean is_abs_literal)
7571 xtensa_relax_info *relax_info;
7572 bfd_boolean literal_placed = FALSE;
7574 unsigned long value;
7575 bfd_boolean final_static_link;
7576 bfd_size_type sec_size;
7578 relax_info = get_xtensa_relax_info (sec);
7582 sec_size = bfd_get_section_limit (abfd, sec);
7585 (!link_info->relocatable
7586 && !elf_hash_table (link_info)->dynamic_sections_created);
7588 /* The placement algorithm first checks to see if the literal is
7589 already in the value map. If so and the value map is reachable
7590 from all uses, then the literal is moved to that location. If
7591 not, then we identify the last location where a fresh literal was
7592 placed. If the literal can be safely moved there, then we do so.
7593 If not, then we assume that the literal is not to move and leave
7594 the literal where it is, marking it as the last literal
7597 /* Find the literal value. */
7599 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7602 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7603 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7605 init_literal_value (&val, &r_rel, value, is_abs_literal);
7607 /* Check if we've seen another literal with the same value that
7608 is in the same output section. */
7609 val_map = value_map_get_cached_value (values, &val, final_static_link);
7612 && (r_reloc_get_section (&val_map->loc)->output_section
7613 == sec->output_section)
7614 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7615 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7617 /* No change to last_loc_is_prev. */
7618 literal_placed = TRUE;
7621 /* For relocatable links, do not try to move literals. To do it
7622 correctly might increase the number of relocations in an input
7623 section making the default relocatable linking fail. */
7624 if (!link_info->relocatable && !literal_placed
7625 && values->has_last_loc && !(*last_loc_is_prev_p))
7627 asection *target_sec = r_reloc_get_section (&values->last_loc);
7628 if (target_sec && target_sec->output_section == sec->output_section)
7630 /* Increment the virtual offset. */
7631 r_reloc try_loc = values->last_loc;
7632 try_loc.virtual_offset += 4;
7634 /* There is a last loc that was in the same output section. */
7635 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7636 && move_shared_literal (sec, link_info, rel,
7637 prop_table, ptblsize,
7638 &try_loc, &val, target_sec_cache))
7640 values->last_loc.virtual_offset += 4;
7641 literal_placed = TRUE;
7643 val_map = add_value_map (values, &val, &try_loc,
7646 val_map->loc = try_loc;
7651 if (!literal_placed)
7653 /* Nothing worked, leave the literal alone but update the last loc. */
7654 values->has_last_loc = TRUE;
7655 values->last_loc = rel->r_rel;
7657 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7659 val_map->loc = rel->r_rel;
7660 *last_loc_is_prev_p = TRUE;
7667 /* Check if the original relocations (presumably on L32R instructions)
7668 identified by reloc[0..N] can be changed to reference the literal
7669 identified by r_rel. If r_rel is out of range for any of the
7670 original relocations, then we don't want to coalesce the original
7671 literal with the one at r_rel. We only check reloc[0..N], where the
7672 offsets are all the same as for reloc[0] (i.e., they're all
7673 referencing the same literal) and where N is also bounded by the
7674 number of remaining entries in the "reloc" array. The "reloc" array
7675 is sorted by target offset so we know all the entries for the same
7676 literal will be contiguous. */
7679 relocations_reach (source_reloc *reloc,
7680 int remaining_relocs,
7681 const r_reloc *r_rel)
7683 bfd_vma from_offset, source_address, dest_address;
7687 if (!r_reloc_is_defined (r_rel))
7690 sec = r_reloc_get_section (r_rel);
7691 from_offset = reloc[0].r_rel.target_offset;
7693 for (i = 0; i < remaining_relocs; i++)
7695 if (reloc[i].r_rel.target_offset != from_offset)
7698 /* Ignore relocations that have been removed. */
7699 if (reloc[i].is_null)
7702 /* The original and new output section for these must be the same
7703 in order to coalesce. */
7704 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7705 != sec->output_section)
7708 /* Absolute literals in the same output section can always be
7710 if (reloc[i].is_abs_literal)
7713 /* A literal with no PC-relative relocations can be moved anywhere. */
7714 if (reloc[i].opnd != -1)
7716 /* Otherwise, check to see that it fits. */
7717 source_address = (reloc[i].source_sec->output_section->vma
7718 + reloc[i].source_sec->output_offset
7719 + reloc[i].r_rel.rela.r_offset);
7720 dest_address = (sec->output_section->vma
7721 + sec->output_offset
7722 + r_rel->target_offset);
7724 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7725 source_address, dest_address))
7734 /* Move a literal to another literal location because it is
7735 the same as the other literal value. */
7738 coalesce_shared_literal (asection *sec,
7740 property_table_entry *prop_table,
7744 property_table_entry *entry;
7746 property_table_entry *the_add_entry;
7748 xtensa_relax_info *relax_info;
7750 relax_info = get_xtensa_relax_info (sec);
7754 entry = elf_xtensa_find_property_entry
7755 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7756 if (entry && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM))
7759 /* Mark that the literal will be coalesced. */
7760 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7762 text_action_add (&relax_info->action_list,
7763 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7765 /* If the section is 4-byte aligned, do not add fill. */
7766 if (sec->alignment_power > 2)
7768 int fill_extra_space;
7769 bfd_vma entry_sec_offset;
7772 entry_sec_offset = entry->address - sec->vma + entry->size;
7774 entry_sec_offset = rel->r_rel.target_offset + 4;
7776 /* If the literal range is at the end of the section,
7778 fill_extra_space = 0;
7779 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7781 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7782 fill_extra_space = the_add_entry->size;
7784 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7785 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7786 -4, fill_extra_space);
7788 adjust_fill_action (fa, removed_diff);
7790 text_action_add (&relax_info->action_list,
7791 ta_fill, sec, entry_sec_offset, removed_diff);
7798 /* Move a literal to another location. This may actually increase the
7799 total amount of space used because of alignments so we need to do
7800 this carefully. Also, it may make a branch go out of range. */
7803 move_shared_literal (asection *sec,
7804 struct bfd_link_info *link_info,
7806 property_table_entry *prop_table,
7808 const r_reloc *target_loc,
7809 const literal_value *lit_value,
7810 section_cache_t *target_sec_cache)
7812 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7813 text_action *fa, *target_fa;
7815 xtensa_relax_info *relax_info, *target_relax_info;
7816 asection *target_sec;
7818 ebb_constraint ebb_table;
7819 bfd_boolean relocs_fit;
7821 /* If this routine always returns FALSE, the literals that cannot be
7822 coalesced will not be moved. */
7823 if (elf32xtensa_no_literal_movement)
7826 relax_info = get_xtensa_relax_info (sec);
7830 target_sec = r_reloc_get_section (target_loc);
7831 target_relax_info = get_xtensa_relax_info (target_sec);
7833 /* Literals to undefined sections may not be moved because they
7834 must report an error. */
7835 if (bfd_is_und_section (target_sec))
7838 src_entry = elf_xtensa_find_property_entry
7839 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7841 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7844 target_entry = elf_xtensa_find_property_entry
7845 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7846 target_sec->vma + target_loc->target_offset);
7851 /* Make sure that we have not broken any branches. */
7854 init_ebb_constraint (&ebb_table);
7855 ebb = &ebb_table.ebb;
7856 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7857 target_sec_cache->content_length,
7858 target_sec_cache->ptbl, target_sec_cache->pte_count,
7859 target_sec_cache->relocs, target_sec_cache->reloc_count);
7861 /* Propose to add 4 bytes + worst-case alignment size increase to
7863 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7864 ta_fill, target_loc->target_offset,
7865 -4 - (1 << target_sec->alignment_power), TRUE);
7867 /* Check all of the PC-relative relocations to make sure they still fit. */
7868 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7869 target_sec_cache->contents,
7870 target_sec_cache->relocs,
7876 text_action_add_literal (&target_relax_info->action_list,
7877 ta_add_literal, target_loc, lit_value, -4);
7879 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7881 /* May need to add or remove some fill to maintain alignment. */
7882 int fill_extra_space;
7883 bfd_vma entry_sec_offset;
7886 target_entry->address - target_sec->vma + target_entry->size;
7888 /* If the literal range is at the end of the section,
7890 fill_extra_space = 0;
7892 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7893 target_sec_cache->pte_count,
7895 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7896 fill_extra_space = the_add_entry->size;
7898 target_fa = find_fill_action (&target_relax_info->action_list,
7899 target_sec, entry_sec_offset);
7900 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7901 entry_sec_offset, 4,
7904 adjust_fill_action (target_fa, removed_diff);
7906 text_action_add (&target_relax_info->action_list,
7907 ta_fill, target_sec, entry_sec_offset, removed_diff);
7910 /* Mark that the literal will be moved to the new location. */
7911 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7913 /* Remove the literal. */
7914 text_action_add (&relax_info->action_list,
7915 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7917 /* If the section is 4-byte aligned, do not add fill. */
7918 if (sec->alignment_power > 2 && target_entry != src_entry)
7920 int fill_extra_space;
7921 bfd_vma entry_sec_offset;
7924 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7926 entry_sec_offset = rel->r_rel.target_offset+4;
7928 /* If the literal range is at the end of the section,
7930 fill_extra_space = 0;
7931 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7933 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7934 fill_extra_space = the_add_entry->size;
7936 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7937 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7938 -4, fill_extra_space);
7940 adjust_fill_action (fa, removed_diff);
7942 text_action_add (&relax_info->action_list,
7943 ta_fill, sec, entry_sec_offset, removed_diff);
7950 /* Second relaxation pass. */
7952 /* Modify all of the relocations to point to the right spot, and if this
7953 is a relaxable section, delete the unwanted literals and fix the
7957 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
7959 Elf_Internal_Rela *internal_relocs;
7960 xtensa_relax_info *relax_info;
7962 bfd_boolean ok = TRUE;
7964 bfd_boolean rv = FALSE;
7965 bfd_boolean virtual_action;
7966 bfd_size_type sec_size;
7968 sec_size = bfd_get_section_limit (abfd, sec);
7969 relax_info = get_xtensa_relax_info (sec);
7970 BFD_ASSERT (relax_info);
7972 /* First translate any of the fixes that have been added already. */
7973 translate_section_fixes (sec);
7975 /* Handle property sections (e.g., literal tables) specially. */
7976 if (xtensa_is_property_section (sec))
7978 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
7979 return relax_property_section (abfd, sec, link_info);
7982 internal_relocs = retrieve_internal_relocs (abfd, sec,
7983 link_info->keep_memory);
7984 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7985 if (contents == NULL && sec_size != 0)
7991 if (internal_relocs)
7993 for (i = 0; i < sec->reloc_count; i++)
7995 Elf_Internal_Rela *irel;
7996 xtensa_relax_info *target_relax_info;
7997 bfd_vma source_offset, old_source_offset;
8000 asection *target_sec;
8002 /* Locally change the source address.
8003 Translate the target to the new target address.
8004 If it points to this section and has been removed,
8008 irel = &internal_relocs[i];
8009 source_offset = irel->r_offset;
8010 old_source_offset = source_offset;
8012 r_type = ELF32_R_TYPE (irel->r_info);
8013 r_reloc_init (&r_rel, abfd, irel, contents,
8014 bfd_get_section_limit (abfd, sec));
8016 /* If this section could have changed then we may need to
8017 change the relocation's offset. */
8019 if (relax_info->is_relaxable_literal_section
8020 || relax_info->is_relaxable_asm_section)
8022 if (r_type != R_XTENSA_NONE
8023 && find_removed_literal (&relax_info->removed_list,
8026 /* Remove this relocation. */
8027 if (elf_hash_table (link_info)->dynamic_sections_created)
8028 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
8029 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8030 irel->r_offset = offset_with_removed_text
8031 (&relax_info->action_list, irel->r_offset);
8032 pin_internal_relocs (sec, internal_relocs);
8036 if (r_type == R_XTENSA_ASM_SIMPLIFY)
8038 text_action *action =
8039 find_insn_action (&relax_info->action_list,
8041 if (action && (action->action == ta_convert_longcall
8042 || action->action == ta_remove_longcall))
8044 bfd_reloc_status_type retval;
8045 char *error_message = NULL;
8047 retval = contract_asm_expansion (contents, sec_size,
8048 irel, &error_message);
8049 if (retval != bfd_reloc_ok)
8051 (*link_info->callbacks->reloc_dangerous)
8052 (link_info, error_message, abfd, sec,
8056 /* Update the action so that the code that moves
8057 the contents will do the right thing. */
8058 if (action->action == ta_remove_longcall)
8059 action->action = ta_remove_insn;
8061 action->action = ta_none;
8062 /* Refresh the info in the r_rel. */
8063 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
8064 r_type = ELF32_R_TYPE (irel->r_info);
8068 source_offset = offset_with_removed_text
8069 (&relax_info->action_list, irel->r_offset);
8070 irel->r_offset = source_offset;
8073 /* If the target section could have changed then
8074 we may need to change the relocation's target offset. */
8076 target_sec = r_reloc_get_section (&r_rel);
8077 target_relax_info = get_xtensa_relax_info (target_sec);
8079 if (target_relax_info
8080 && (target_relax_info->is_relaxable_literal_section
8081 || target_relax_info->is_relaxable_asm_section))
8085 bfd_vma addend_displacement;
8087 translate_reloc (&r_rel, &new_reloc);
8089 if (r_type == R_XTENSA_DIFF8
8090 || r_type == R_XTENSA_DIFF16
8091 || r_type == R_XTENSA_DIFF32)
8093 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
8095 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
8097 (*link_info->callbacks->reloc_dangerous)
8098 (link_info, _("invalid relocation address"),
8099 abfd, sec, old_source_offset);
8105 case R_XTENSA_DIFF8:
8107 bfd_get_8 (abfd, &contents[old_source_offset]);
8109 case R_XTENSA_DIFF16:
8111 bfd_get_16 (abfd, &contents[old_source_offset]);
8113 case R_XTENSA_DIFF32:
8115 bfd_get_32 (abfd, &contents[old_source_offset]);
8119 new_end_offset = offset_with_removed_text
8120 (&target_relax_info->action_list,
8121 r_rel.target_offset + diff_value);
8122 diff_value = new_end_offset - new_reloc.target_offset;
8126 case R_XTENSA_DIFF8:
8128 bfd_put_8 (abfd, diff_value,
8129 &contents[old_source_offset]);
8131 case R_XTENSA_DIFF16:
8133 bfd_put_16 (abfd, diff_value,
8134 &contents[old_source_offset]);
8136 case R_XTENSA_DIFF32:
8137 diff_mask = 0xffffffff;
8138 bfd_put_32 (abfd, diff_value,
8139 &contents[old_source_offset]);
8143 /* Check for overflow. */
8144 if ((diff_value & ~diff_mask) != 0)
8146 (*link_info->callbacks->reloc_dangerous)
8147 (link_info, _("overflow after relaxation"),
8148 abfd, sec, old_source_offset);
8152 pin_contents (sec, contents);
8155 /* FIXME: If the relocation still references a section in
8156 the same input file, the relocation should be modified
8157 directly instead of adding a "fix" record. */
8159 addend_displacement =
8160 new_reloc.target_offset + new_reloc.virtual_offset;
8162 fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0,
8163 r_reloc_get_section (&new_reloc),
8164 addend_displacement, TRUE);
8168 pin_internal_relocs (sec, internal_relocs);
8172 if ((relax_info->is_relaxable_literal_section
8173 || relax_info->is_relaxable_asm_section)
8174 && relax_info->action_list.head)
8176 /* Walk through the planned actions and build up a table
8177 of move, copy and fill records. Use the move, copy and
8178 fill records to perform the actions once. */
8180 bfd_size_type size = sec->size;
8182 bfd_size_type final_size, copy_size, orig_insn_size;
8183 bfd_byte *scratch = NULL;
8184 bfd_byte *dup_contents = NULL;
8185 bfd_size_type orig_size = size;
8186 bfd_vma orig_dot = 0;
8187 bfd_vma orig_dot_copied = 0; /* Byte copied already from
8188 orig dot in physical memory. */
8189 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
8190 bfd_vma dup_dot = 0;
8192 text_action *action = relax_info->action_list.head;
8194 final_size = sec->size;
8195 for (action = relax_info->action_list.head; action;
8196 action = action->next)
8198 final_size -= action->removed_bytes;
8201 scratch = (bfd_byte *) bfd_zmalloc (final_size);
8202 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
8204 /* The dot is the current fill location. */
8206 print_action_list (stderr, &relax_info->action_list);
8209 for (action = relax_info->action_list.head; action;
8210 action = action->next)
8212 virtual_action = FALSE;
8213 if (action->offset > orig_dot)
8215 orig_dot += orig_dot_copied;
8216 orig_dot_copied = 0;
8218 /* Out of the virtual world. */
8221 if (action->offset > orig_dot)
8223 copy_size = action->offset - orig_dot;
8224 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8225 orig_dot += copy_size;
8226 dup_dot += copy_size;
8227 BFD_ASSERT (action->offset == orig_dot);
8229 else if (action->offset < orig_dot)
8231 if (action->action == ta_fill
8232 && action->offset - action->removed_bytes == orig_dot)
8234 /* This is OK because the fill only effects the dup_dot. */
8236 else if (action->action == ta_add_literal)
8238 /* TBD. Might need to handle this. */
8241 if (action->offset == orig_dot)
8243 if (action->virtual_offset > orig_dot_vo)
8245 if (orig_dot_vo == 0)
8247 /* Need to copy virtual_offset bytes. Probably four. */
8248 copy_size = action->virtual_offset - orig_dot_vo;
8249 memmove (&dup_contents[dup_dot],
8250 &contents[orig_dot], copy_size);
8251 orig_dot_copied = copy_size;
8252 dup_dot += copy_size;
8254 virtual_action = TRUE;
8257 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8259 switch (action->action)
8261 case ta_remove_literal:
8262 case ta_remove_insn:
8263 BFD_ASSERT (action->removed_bytes >= 0);
8264 orig_dot += action->removed_bytes;
8267 case ta_narrow_insn:
8270 memmove (scratch, &contents[orig_dot], orig_insn_size);
8271 BFD_ASSERT (action->removed_bytes == 1);
8272 rv = narrow_instruction (scratch, final_size, 0);
8274 memmove (&dup_contents[dup_dot], scratch, copy_size);
8275 orig_dot += orig_insn_size;
8276 dup_dot += copy_size;
8280 if (action->removed_bytes >= 0)
8281 orig_dot += action->removed_bytes;
8284 /* Already zeroed in dup_contents. Just bump the
8286 dup_dot += (-action->removed_bytes);
8291 BFD_ASSERT (action->removed_bytes == 0);
8294 case ta_convert_longcall:
8295 case ta_remove_longcall:
8296 /* These will be removed or converted before we get here. */
8303 memmove (scratch, &contents[orig_dot], orig_insn_size);
8304 BFD_ASSERT (action->removed_bytes == -1);
8305 rv = widen_instruction (scratch, final_size, 0);
8307 memmove (&dup_contents[dup_dot], scratch, copy_size);
8308 orig_dot += orig_insn_size;
8309 dup_dot += copy_size;
8312 case ta_add_literal:
8315 BFD_ASSERT (action->removed_bytes == -4);
8316 /* TBD -- place the literal value here and insert
8318 memset (&dup_contents[dup_dot], 0, 4);
8319 pin_internal_relocs (sec, internal_relocs);
8320 pin_contents (sec, contents);
8322 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8323 relax_info, &internal_relocs, &action->value))
8327 orig_dot_vo += copy_size;
8329 orig_dot += orig_insn_size;
8330 dup_dot += copy_size;
8334 /* Not implemented yet. */
8339 size -= action->removed_bytes;
8340 removed += action->removed_bytes;
8341 BFD_ASSERT (dup_dot <= final_size);
8342 BFD_ASSERT (orig_dot <= orig_size);
8345 orig_dot += orig_dot_copied;
8346 orig_dot_copied = 0;
8348 if (orig_dot != orig_size)
8350 copy_size = orig_size - orig_dot;
8351 BFD_ASSERT (orig_size > orig_dot);
8352 BFD_ASSERT (dup_dot + copy_size == final_size);
8353 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8354 orig_dot += copy_size;
8355 dup_dot += copy_size;
8357 BFD_ASSERT (orig_size == orig_dot);
8358 BFD_ASSERT (final_size == dup_dot);
8360 /* Move the dup_contents back. */
8361 if (final_size > orig_size)
8363 /* Contents need to be reallocated. Swap the dup_contents into
8365 sec->contents = dup_contents;
8367 contents = dup_contents;
8368 pin_contents (sec, contents);
8372 BFD_ASSERT (final_size <= orig_size);
8373 memset (contents, 0, orig_size);
8374 memcpy (contents, dup_contents, final_size);
8375 free (dup_contents);
8378 pin_contents (sec, contents);
8380 sec->size = final_size;
8384 release_internal_relocs (sec, internal_relocs);
8385 release_contents (sec, contents);
8391 translate_section_fixes (asection *sec)
8393 xtensa_relax_info *relax_info;
8396 relax_info = get_xtensa_relax_info (sec);
8400 for (r = relax_info->fix_list; r != NULL; r = r->next)
8401 if (!translate_reloc_bfd_fix (r))
8408 /* Translate a fix given the mapping in the relax info for the target
8409 section. If it has already been translated, no work is required. */
8412 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8414 reloc_bfd_fix new_fix;
8416 xtensa_relax_info *relax_info;
8417 removed_literal *removed;
8418 bfd_vma new_offset, target_offset;
8420 if (fix->translated)
8423 sec = fix->target_sec;
8424 target_offset = fix->target_offset;
8426 relax_info = get_xtensa_relax_info (sec);
8429 fix->translated = TRUE;
8435 /* The fix does not need to be translated if the section cannot change. */
8436 if (!relax_info->is_relaxable_literal_section
8437 && !relax_info->is_relaxable_asm_section)
8439 fix->translated = TRUE;
8443 /* If the literal has been moved and this relocation was on an
8444 opcode, then the relocation should move to the new literal
8445 location. Otherwise, the relocation should move within the
8449 if (is_operand_relocation (fix->src_type))
8451 /* Check if the original relocation is against a literal being
8453 removed = find_removed_literal (&relax_info->removed_list,
8461 /* The fact that there is still a relocation to this literal indicates
8462 that the literal is being coalesced, not simply removed. */
8463 BFD_ASSERT (removed->to.abfd != NULL);
8465 /* This was moved to some other address (possibly another section). */
8466 new_sec = r_reloc_get_section (&removed->to);
8470 relax_info = get_xtensa_relax_info (sec);
8472 (!relax_info->is_relaxable_literal_section
8473 && !relax_info->is_relaxable_asm_section))
8475 target_offset = removed->to.target_offset;
8476 new_fix.target_sec = new_sec;
8477 new_fix.target_offset = target_offset;
8478 new_fix.translated = TRUE;
8483 target_offset = removed->to.target_offset;
8484 new_fix.target_sec = new_sec;
8487 /* The target address may have been moved within its section. */
8488 new_offset = offset_with_removed_text (&relax_info->action_list,
8491 new_fix.target_offset = new_offset;
8492 new_fix.target_offset = new_offset;
8493 new_fix.translated = TRUE;
8499 /* Fix up a relocation to take account of removed literals. */
8502 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8505 xtensa_relax_info *relax_info;
8506 removed_literal *removed;
8507 bfd_vma new_offset, target_offset, removed_bytes;
8509 *new_rel = *orig_rel;
8511 if (!r_reloc_is_defined (orig_rel))
8513 sec = r_reloc_get_section (orig_rel);
8515 relax_info = get_xtensa_relax_info (sec);
8516 BFD_ASSERT (relax_info);
8518 if (!relax_info->is_relaxable_literal_section
8519 && !relax_info->is_relaxable_asm_section)
8522 target_offset = orig_rel->target_offset;
8525 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8527 /* Check if the original relocation is against a literal being
8529 removed = find_removed_literal (&relax_info->removed_list,
8532 if (removed && removed->to.abfd)
8536 /* The fact that there is still a relocation to this literal indicates
8537 that the literal is being coalesced, not simply removed. */
8538 BFD_ASSERT (removed->to.abfd != NULL);
8540 /* This was moved to some other address
8541 (possibly in another section). */
8542 *new_rel = removed->to;
8543 new_sec = r_reloc_get_section (new_rel);
8547 relax_info = get_xtensa_relax_info (sec);
8549 || (!relax_info->is_relaxable_literal_section
8550 && !relax_info->is_relaxable_asm_section))
8553 target_offset = new_rel->target_offset;
8556 /* ...and the target address may have been moved within its section. */
8557 new_offset = offset_with_removed_text (&relax_info->action_list,
8560 /* Modify the offset and addend. */
8561 removed_bytes = target_offset - new_offset;
8562 new_rel->target_offset = new_offset;
8563 new_rel->rela.r_addend -= removed_bytes;
8567 /* For dynamic links, there may be a dynamic relocation for each
8568 literal. The number of dynamic relocations must be computed in
8569 size_dynamic_sections, which occurs before relaxation. When a
8570 literal is removed, this function checks if there is a corresponding
8571 dynamic relocation and shrinks the size of the appropriate dynamic
8572 relocation section accordingly. At this point, the contents of the
8573 dynamic relocation sections have not yet been filled in, so there's
8574 nothing else that needs to be done. */
8577 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8579 asection *input_section,
8580 Elf_Internal_Rela *rel)
8582 struct elf_xtensa_link_hash_table *htab;
8583 Elf_Internal_Shdr *symtab_hdr;
8584 struct elf_link_hash_entry **sym_hashes;
8585 unsigned long r_symndx;
8587 struct elf_link_hash_entry *h;
8588 bfd_boolean dynamic_symbol;
8590 htab = elf_xtensa_hash_table (info);
8591 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8592 sym_hashes = elf_sym_hashes (abfd);
8594 r_type = ELF32_R_TYPE (rel->r_info);
8595 r_symndx = ELF32_R_SYM (rel->r_info);
8597 if (r_symndx < symtab_hdr->sh_info)
8600 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8602 dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info);
8604 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8605 && (input_section->flags & SEC_ALLOC) != 0
8606 && (dynamic_symbol || info->shared))
8609 bfd_boolean is_plt = FALSE;
8611 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8613 srel = htab->srelplt;
8617 srel = htab->srelgot;
8619 /* Reduce size of the .rela.* section by one reloc. */
8620 BFD_ASSERT (srel != NULL);
8621 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8622 srel->size -= sizeof (Elf32_External_Rela);
8626 asection *splt, *sgotplt, *srelgot;
8627 int reloc_index, chunk;
8629 /* Find the PLT reloc index of the entry being removed. This
8630 is computed from the size of ".rela.plt". It is needed to
8631 figure out which PLT chunk to resize. Usually "last index
8632 = size - 1" since the index starts at zero, but in this
8633 context, the size has just been decremented so there's no
8634 need to subtract one. */
8635 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8637 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8638 splt = elf_xtensa_get_plt_section (info, chunk);
8639 sgotplt = elf_xtensa_get_gotplt_section (info, chunk);
8640 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8642 /* Check if an entire PLT chunk has just been eliminated. */
8643 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8645 /* The two magic GOT entries for that chunk can go away. */
8646 srelgot = htab->srelgot;
8647 BFD_ASSERT (srelgot != NULL);
8648 srelgot->reloc_count -= 2;
8649 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8652 /* There should be only one entry left (and it will be
8654 BFD_ASSERT (sgotplt->size == 4);
8655 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8658 BFD_ASSERT (sgotplt->size >= 4);
8659 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8662 splt->size -= PLT_ENTRY_SIZE;
8668 /* Take an r_rel and move it to another section. This usually
8669 requires extending the interal_relocation array and pinning it. If
8670 the original r_rel is from the same BFD, we can complete this here.
8671 Otherwise, we add a fix record to let the final link fix the
8672 appropriate address. Contents and internal relocations for the
8673 section must be pinned after calling this routine. */
8676 move_literal (bfd *abfd,
8677 struct bfd_link_info *link_info,
8681 xtensa_relax_info *relax_info,
8682 Elf_Internal_Rela **internal_relocs_p,
8683 const literal_value *lit)
8685 Elf_Internal_Rela *new_relocs = NULL;
8686 size_t new_relocs_count = 0;
8687 Elf_Internal_Rela this_rela;
8688 const r_reloc *r_rel;
8690 r_rel = &lit->r_rel;
8691 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8693 if (r_reloc_is_const (r_rel))
8694 bfd_put_32 (abfd, lit->value, contents + offset);
8699 asection *target_sec;
8703 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8704 target_sec = r_reloc_get_section (r_rel);
8706 /* This is the difficult case. We have to create a fix up. */
8707 this_rela.r_offset = offset;
8708 this_rela.r_info = ELF32_R_INFO (0, r_type);
8709 this_rela.r_addend =
8710 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8711 bfd_put_32 (abfd, lit->value, contents + offset);
8713 /* Currently, we cannot move relocations during a relocatable link. */
8714 BFD_ASSERT (!link_info->relocatable);
8715 fix = reloc_bfd_fix_init (sec, offset, r_type, r_rel->abfd,
8716 r_reloc_get_section (r_rel),
8717 r_rel->target_offset + r_rel->virtual_offset,
8719 /* We also need to mark that relocations are needed here. */
8720 sec->flags |= SEC_RELOC;
8722 translate_reloc_bfd_fix (fix);
8723 /* This fix has not yet been translated. */
8726 /* Add the relocation. If we have already allocated our own
8727 space for the relocations and we have room for more, then use
8728 it. Otherwise, allocate new space and move the literals. */
8729 insert_at = sec->reloc_count;
8730 for (i = 0; i < sec->reloc_count; ++i)
8732 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8739 if (*internal_relocs_p != relax_info->allocated_relocs
8740 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8742 BFD_ASSERT (relax_info->allocated_relocs == NULL
8743 || sec->reloc_count == relax_info->relocs_count);
8745 if (relax_info->allocated_relocs_count == 0)
8746 new_relocs_count = (sec->reloc_count + 2) * 2;
8748 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8750 new_relocs = (Elf_Internal_Rela *)
8751 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8755 /* We could handle this more quickly by finding the split point. */
8757 memcpy (new_relocs, *internal_relocs_p,
8758 insert_at * sizeof (Elf_Internal_Rela));
8760 new_relocs[insert_at] = this_rela;
8762 if (insert_at != sec->reloc_count)
8763 memcpy (new_relocs + insert_at + 1,
8764 (*internal_relocs_p) + insert_at,
8765 (sec->reloc_count - insert_at)
8766 * sizeof (Elf_Internal_Rela));
8768 if (*internal_relocs_p != relax_info->allocated_relocs)
8770 /* The first time we re-allocate, we can only free the
8771 old relocs if they were allocated with bfd_malloc.
8772 This is not true when keep_memory is in effect. */
8773 if (!link_info->keep_memory)
8774 free (*internal_relocs_p);
8777 free (*internal_relocs_p);
8778 relax_info->allocated_relocs = new_relocs;
8779 relax_info->allocated_relocs_count = new_relocs_count;
8780 elf_section_data (sec)->relocs = new_relocs;
8782 relax_info->relocs_count = sec->reloc_count;
8783 *internal_relocs_p = new_relocs;
8787 if (insert_at != sec->reloc_count)
8790 for (idx = sec->reloc_count; idx > insert_at; idx--)
8791 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8793 (*internal_relocs_p)[insert_at] = this_rela;
8795 if (relax_info->allocated_relocs)
8796 relax_info->relocs_count = sec->reloc_count;
8803 /* This is similar to relax_section except that when a target is moved,
8804 we shift addresses up. We also need to modify the size. This
8805 algorithm does NOT allow for relocations into the middle of the
8806 property sections. */
8809 relax_property_section (bfd *abfd,
8811 struct bfd_link_info *link_info)
8813 Elf_Internal_Rela *internal_relocs;
8816 bfd_boolean ok = TRUE;
8817 bfd_boolean is_full_prop_section;
8818 size_t last_zfill_target_offset = 0;
8819 asection *last_zfill_target_sec = NULL;
8820 bfd_size_type sec_size;
8822 sec_size = bfd_get_section_limit (abfd, sec);
8823 internal_relocs = retrieve_internal_relocs (abfd, sec,
8824 link_info->keep_memory);
8825 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8826 if (contents == NULL && sec_size != 0)
8832 is_full_prop_section =
8833 ( CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME)
8834 || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop."));
8836 if (internal_relocs)
8838 for (i = 0; i < sec->reloc_count; i++)
8840 Elf_Internal_Rela *irel;
8841 xtensa_relax_info *target_relax_info;
8843 asection *target_sec;
8845 bfd_byte *size_p, *flags_p;
8847 /* Locally change the source address.
8848 Translate the target to the new target address.
8849 If it points to this section and has been removed, MOVE IT.
8850 Also, don't forget to modify the associated SIZE at
8853 irel = &internal_relocs[i];
8854 r_type = ELF32_R_TYPE (irel->r_info);
8855 if (r_type == R_XTENSA_NONE)
8858 /* Find the literal value. */
8859 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8860 size_p = &contents[irel->r_offset + 4];
8862 if (is_full_prop_section)
8864 flags_p = &contents[irel->r_offset + 8];
8865 BFD_ASSERT (irel->r_offset + 12 <= sec_size);
8868 BFD_ASSERT (irel->r_offset + 8 <= sec_size);
8870 target_sec = r_reloc_get_section (&val.r_rel);
8871 target_relax_info = get_xtensa_relax_info (target_sec);
8873 if (target_relax_info
8874 && (target_relax_info->is_relaxable_literal_section
8875 || target_relax_info->is_relaxable_asm_section ))
8877 /* Translate the relocation's destination. */
8878 bfd_vma new_offset, new_end_offset;
8879 long old_size, new_size;
8881 new_offset = offset_with_removed_text
8882 (&target_relax_info->action_list, val.r_rel.target_offset);
8884 /* Assert that we are not out of bounds. */
8885 old_size = bfd_get_32 (abfd, size_p);
8889 /* Only the first zero-sized unreachable entry is
8890 allowed to expand. In this case the new offset
8891 should be the offset before the fill and the new
8892 size is the expansion size. For other zero-sized
8893 entries the resulting size should be zero with an
8894 offset before or after the fill address depending
8895 on whether the expanding unreachable entry
8897 if (last_zfill_target_sec
8898 && last_zfill_target_sec == target_sec
8899 && last_zfill_target_offset == val.r_rel.target_offset)
8900 new_end_offset = new_offset;
8903 new_end_offset = new_offset;
8904 new_offset = offset_with_removed_text_before_fill
8905 (&target_relax_info->action_list,
8906 val.r_rel.target_offset);
8908 /* If it is not unreachable and we have not yet
8909 seen an unreachable at this address, place it
8910 before the fill address. */
8912 || (bfd_get_32 (abfd, flags_p)
8913 & XTENSA_PROP_UNREACHABLE) == 0)
8914 new_end_offset = new_offset;
8917 last_zfill_target_sec = target_sec;
8918 last_zfill_target_offset = val.r_rel.target_offset;
8924 new_end_offset = offset_with_removed_text_before_fill
8925 (&target_relax_info->action_list,
8926 val.r_rel.target_offset + old_size);
8929 new_size = new_end_offset - new_offset;
8931 if (new_size != old_size)
8933 bfd_put_32 (abfd, new_size, size_p);
8934 pin_contents (sec, contents);
8937 if (new_offset != val.r_rel.target_offset)
8939 bfd_vma diff = new_offset - val.r_rel.target_offset;
8940 irel->r_addend += diff;
8941 pin_internal_relocs (sec, internal_relocs);
8947 /* Combine adjacent property table entries. This is also done in
8948 finish_dynamic_sections() but at that point it's too late to
8949 reclaim the space in the output section, so we do this twice. */
8951 if (internal_relocs && (!link_info->relocatable
8952 || strcmp (sec->name, XTENSA_LIT_SEC_NAME) == 0))
8954 Elf_Internal_Rela *last_irel = NULL;
8955 int removed_bytes = 0;
8956 bfd_vma offset, last_irel_offset;
8957 bfd_vma section_size;
8958 bfd_size_type entry_size;
8959 flagword predef_flags;
8961 if (is_full_prop_section)
8966 predef_flags = xtensa_get_property_predef_flags (sec);
8968 /* Walk over memory and irels at the same time.
8969 This REQUIRES that the internal_relocs be sorted by offset. */
8970 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
8971 internal_reloc_compare);
8972 nexti = 0; /* Index into internal_relocs. */
8974 pin_internal_relocs (sec, internal_relocs);
8975 pin_contents (sec, contents);
8977 last_irel_offset = (bfd_vma) -1;
8978 section_size = sec->size;
8979 BFD_ASSERT (section_size % entry_size == 0);
8981 for (offset = 0; offset < section_size; offset += entry_size)
8983 Elf_Internal_Rela *irel, *next_irel;
8984 bfd_vma bytes_to_remove, size, actual_offset;
8985 bfd_boolean remove_this_irel;
8991 /* Find the next two relocations (if there are that many left),
8992 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
8993 the starting reloc index. After these two loops, "i"
8994 is the index of the first non-NONE reloc past that starting
8995 index, and "nexti" is the index for the next non-NONE reloc
8998 for (i = nexti; i < sec->reloc_count; i++)
9000 if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE)
9002 irel = &internal_relocs[i];
9005 internal_relocs[i].r_offset -= removed_bytes;
9008 for (nexti = i + 1; nexti < sec->reloc_count; nexti++)
9010 if (ELF32_R_TYPE (internal_relocs[nexti].r_info)
9013 next_irel = &internal_relocs[nexti];
9016 internal_relocs[nexti].r_offset -= removed_bytes;
9019 remove_this_irel = FALSE;
9020 bytes_to_remove = 0;
9021 actual_offset = offset - removed_bytes;
9022 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
9024 if (is_full_prop_section)
9025 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
9027 flags = predef_flags;
9029 /* Check that the irels are sorted by offset,
9030 with only one per address. */
9031 BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset);
9032 BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset);
9034 /* Make sure there aren't relocs on the size or flag fields. */
9035 if ((irel && irel->r_offset == offset + 4)
9036 || (is_full_prop_section
9037 && irel && irel->r_offset == offset + 8))
9039 irel->r_offset -= removed_bytes;
9040 last_irel_offset = irel->r_offset;
9042 else if (next_irel && (next_irel->r_offset == offset + 4
9043 || (is_full_prop_section
9044 && next_irel->r_offset == offset + 8)))
9047 irel->r_offset -= removed_bytes;
9048 next_irel->r_offset -= removed_bytes;
9049 last_irel_offset = next_irel->r_offset;
9051 else if (size == 0 && (flags & XTENSA_PROP_ALIGN) == 0
9052 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
9054 /* Always remove entries with zero size and no alignment. */
9055 bytes_to_remove = entry_size;
9056 if (irel && irel->r_offset == offset)
9058 remove_this_irel = TRUE;
9060 irel->r_offset -= removed_bytes;
9061 last_irel_offset = irel->r_offset;
9064 else if (irel && irel->r_offset == offset)
9066 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32)
9072 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
9073 bfd_vma old_address =
9074 (last_irel->r_addend
9075 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
9076 bfd_vma new_address =
9078 + bfd_get_32 (abfd, &contents[actual_offset]));
9079 if (is_full_prop_section)
9080 old_flags = bfd_get_32
9081 (abfd, &contents[last_irel->r_offset + 8]);
9083 old_flags = predef_flags;
9085 if ((ELF32_R_SYM (irel->r_info)
9086 == ELF32_R_SYM (last_irel->r_info))
9087 && old_address + old_size == new_address
9088 && old_flags == flags
9089 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
9090 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
9092 /* Fix the old size. */
9093 bfd_put_32 (abfd, old_size + size,
9094 &contents[last_irel->r_offset + 4]);
9095 bytes_to_remove = entry_size;
9096 remove_this_irel = TRUE;
9105 irel->r_offset -= removed_bytes;
9106 last_irel_offset = irel->r_offset;
9109 if (remove_this_irel)
9111 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
9112 irel->r_offset -= bytes_to_remove;
9115 if (bytes_to_remove != 0)
9117 removed_bytes += bytes_to_remove;
9118 if (offset + bytes_to_remove < section_size)
9119 memmove (&contents[actual_offset],
9120 &contents[actual_offset + bytes_to_remove],
9121 section_size - offset - bytes_to_remove);
9127 /* Clear the removed bytes. */
9128 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
9130 sec->size = section_size - removed_bytes;
9132 if (xtensa_is_littable_section (sec))
9134 asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc;
9136 sgotloc->size -= removed_bytes;
9142 release_internal_relocs (sec, internal_relocs);
9143 release_contents (sec, contents);
9148 /* Third relaxation pass. */
9150 /* Change symbol values to account for removed literals. */
9153 relax_section_symbols (bfd *abfd, asection *sec)
9155 xtensa_relax_info *relax_info;
9156 unsigned int sec_shndx;
9157 Elf_Internal_Shdr *symtab_hdr;
9158 Elf_Internal_Sym *isymbuf;
9159 unsigned i, num_syms, num_locals;
9161 relax_info = get_xtensa_relax_info (sec);
9162 BFD_ASSERT (relax_info);
9164 if (!relax_info->is_relaxable_literal_section
9165 && !relax_info->is_relaxable_asm_section)
9168 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
9170 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9171 isymbuf = retrieve_local_syms (abfd);
9173 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
9174 num_locals = symtab_hdr->sh_info;
9176 /* Adjust the local symbols defined in this section. */
9177 for (i = 0; i < num_locals; i++)
9179 Elf_Internal_Sym *isym = &isymbuf[i];
9181 if (isym->st_shndx == sec_shndx)
9183 bfd_vma new_address = offset_with_removed_text
9184 (&relax_info->action_list, isym->st_value);
9185 bfd_vma new_size = isym->st_size;
9187 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
9189 bfd_vma new_end = offset_with_removed_text
9190 (&relax_info->action_list, isym->st_value + isym->st_size);
9191 new_size = new_end - new_address;
9194 isym->st_value = new_address;
9195 isym->st_size = new_size;
9199 /* Now adjust the global symbols defined in this section. */
9200 for (i = 0; i < (num_syms - num_locals); i++)
9202 struct elf_link_hash_entry *sym_hash;
9204 sym_hash = elf_sym_hashes (abfd)[i];
9206 if (sym_hash->root.type == bfd_link_hash_warning)
9207 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
9209 if ((sym_hash->root.type == bfd_link_hash_defined
9210 || sym_hash->root.type == bfd_link_hash_defweak)
9211 && sym_hash->root.u.def.section == sec)
9213 bfd_vma new_address = offset_with_removed_text
9214 (&relax_info->action_list, sym_hash->root.u.def.value);
9215 bfd_vma new_size = sym_hash->size;
9217 if (sym_hash->type == STT_FUNC)
9219 bfd_vma new_end = offset_with_removed_text
9220 (&relax_info->action_list,
9221 sym_hash->root.u.def.value + sym_hash->size);
9222 new_size = new_end - new_address;
9225 sym_hash->root.u.def.value = new_address;
9226 sym_hash->size = new_size;
9234 /* "Fix" handling functions, called while performing relocations. */
9237 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9239 asection *input_section,
9243 asection *sec, *old_sec;
9245 int r_type = ELF32_R_TYPE (rel->r_info);
9248 if (r_type == R_XTENSA_NONE)
9251 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9255 r_reloc_init (&r_rel, input_bfd, rel, contents,
9256 bfd_get_section_limit (input_bfd, input_section));
9257 old_sec = r_reloc_get_section (&r_rel);
9258 old_offset = r_rel.target_offset;
9260 if (!old_sec || !r_reloc_is_defined (&r_rel))
9262 if (r_type != R_XTENSA_ASM_EXPAND)
9264 (*_bfd_error_handler)
9265 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9266 input_bfd, input_section, rel->r_offset,
9267 elf_howto_table[r_type].name);
9270 /* Leave it be. Resolution will happen in a later stage. */
9274 sec = fix->target_sec;
9275 rel->r_addend += ((sec->output_offset + fix->target_offset)
9276 - (old_sec->output_offset + old_offset));
9283 do_fix_for_final_link (Elf_Internal_Rela *rel,
9285 asection *input_section,
9287 bfd_vma *relocationp)
9290 int r_type = ELF32_R_TYPE (rel->r_info);
9294 if (r_type == R_XTENSA_NONE)
9297 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9301 sec = fix->target_sec;
9303 fixup_diff = rel->r_addend;
9304 if (elf_howto_table[fix->src_type].partial_inplace)
9306 bfd_vma inplace_val;
9307 BFD_ASSERT (fix->src_offset
9308 < bfd_get_section_limit (input_bfd, input_section));
9309 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9310 fixup_diff += inplace_val;
9313 *relocationp = (sec->output_section->vma
9314 + sec->output_offset
9315 + fix->target_offset - fixup_diff);
9319 /* Miscellaneous utility functions.... */
9322 elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk)
9324 struct elf_xtensa_link_hash_table *htab;
9330 htab = elf_xtensa_hash_table (info);
9334 dynobj = elf_hash_table (info)->dynobj;
9335 sprintf (plt_name, ".plt.%u", chunk);
9336 return bfd_get_section_by_name (dynobj, plt_name);
9341 elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk)
9343 struct elf_xtensa_link_hash_table *htab;
9349 htab = elf_xtensa_hash_table (info);
9350 return htab->sgotplt;
9353 dynobj = elf_hash_table (info)->dynobj;
9354 sprintf (got_name, ".got.plt.%u", chunk);
9355 return bfd_get_section_by_name (dynobj, got_name);
9359 /* Get the input section for a given symbol index.
9361 . a section symbol, return the section;
9362 . a common symbol, return the common section;
9363 . an undefined symbol, return the undefined section;
9364 . an indirect symbol, follow the links;
9365 . an absolute value, return the absolute section. */
9368 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9370 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9371 asection *target_sec = NULL;
9372 if (r_symndx < symtab_hdr->sh_info)
9374 Elf_Internal_Sym *isymbuf;
9375 unsigned int section_index;
9377 isymbuf = retrieve_local_syms (abfd);
9378 section_index = isymbuf[r_symndx].st_shndx;
9380 if (section_index == SHN_UNDEF)
9381 target_sec = bfd_und_section_ptr;
9382 else if (section_index > 0 && section_index < SHN_LORESERVE)
9383 target_sec = bfd_section_from_elf_index (abfd, section_index);
9384 else if (section_index == SHN_ABS)
9385 target_sec = bfd_abs_section_ptr;
9386 else if (section_index == SHN_COMMON)
9387 target_sec = bfd_com_section_ptr;
9394 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9395 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9397 while (h->root.type == bfd_link_hash_indirect
9398 || h->root.type == bfd_link_hash_warning)
9399 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9401 switch (h->root.type)
9403 case bfd_link_hash_defined:
9404 case bfd_link_hash_defweak:
9405 target_sec = h->root.u.def.section;
9407 case bfd_link_hash_common:
9408 target_sec = bfd_com_section_ptr;
9410 case bfd_link_hash_undefined:
9411 case bfd_link_hash_undefweak:
9412 target_sec = bfd_und_section_ptr;
9414 default: /* New indirect warning. */
9415 target_sec = bfd_und_section_ptr;
9423 static struct elf_link_hash_entry *
9424 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9427 struct elf_link_hash_entry *h;
9428 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9430 if (r_symndx < symtab_hdr->sh_info)
9433 indx = r_symndx - symtab_hdr->sh_info;
9434 h = elf_sym_hashes (abfd)[indx];
9435 while (h->root.type == bfd_link_hash_indirect
9436 || h->root.type == bfd_link_hash_warning)
9437 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9442 /* Get the section-relative offset for a symbol number. */
9445 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9447 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9450 if (r_symndx < symtab_hdr->sh_info)
9452 Elf_Internal_Sym *isymbuf;
9453 isymbuf = retrieve_local_syms (abfd);
9454 offset = isymbuf[r_symndx].st_value;
9458 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9459 struct elf_link_hash_entry *h =
9460 elf_sym_hashes (abfd)[indx];
9462 while (h->root.type == bfd_link_hash_indirect
9463 || h->root.type == bfd_link_hash_warning)
9464 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9465 if (h->root.type == bfd_link_hash_defined
9466 || h->root.type == bfd_link_hash_defweak)
9467 offset = h->root.u.def.value;
9474 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9476 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9477 struct elf_link_hash_entry *h;
9479 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9480 if (h && h->root.type == bfd_link_hash_defweak)
9487 pcrel_reloc_fits (xtensa_opcode opc,
9489 bfd_vma self_address,
9490 bfd_vma dest_address)
9492 xtensa_isa isa = xtensa_default_isa;
9493 uint32 valp = dest_address;
9494 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9495 || xtensa_operand_encode (isa, opc, opnd, &valp))
9501 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9504 xtensa_is_property_section (asection *sec)
9506 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9507 || CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME)
9508 || CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME))
9511 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9512 && (CONST_STRNEQ (&sec->name[linkonce_len], "x.")
9513 || CONST_STRNEQ (&sec->name[linkonce_len], "p.")
9514 || CONST_STRNEQ (&sec->name[linkonce_len], "prop.")))
9522 xtensa_is_littable_section (asection *sec)
9524 if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME))
9527 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9528 && sec->name[linkonce_len] == 'p'
9529 && sec->name[linkonce_len + 1] == '.')
9537 internal_reloc_compare (const void *ap, const void *bp)
9539 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9540 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9542 if (a->r_offset != b->r_offset)
9543 return (a->r_offset - b->r_offset);
9545 /* We don't need to sort on these criteria for correctness,
9546 but enforcing a more strict ordering prevents unstable qsort
9547 from behaving differently with different implementations.
9548 Without the code below we get correct but different results
9549 on Solaris 2.7 and 2.8. We would like to always produce the
9550 same results no matter the host. */
9552 if (a->r_info != b->r_info)
9553 return (a->r_info - b->r_info);
9555 return (a->r_addend - b->r_addend);
9560 internal_reloc_matches (const void *ap, const void *bp)
9562 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9563 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9565 /* Check if one entry overlaps with the other; this shouldn't happen
9566 except when searching for a match. */
9567 return (a->r_offset - b->r_offset);
9571 /* Predicate function used to look up a section in a particular group. */
9574 match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
9576 const char *gname = inf;
9577 const char *group_name = elf_group_name (sec);
9579 return (group_name == gname
9580 || (group_name != NULL
9582 && strcmp (group_name, gname) == 0));
9587 xtensa_get_property_section (asection *sec, const char *base_name)
9589 const char *suffix, *group_name;
9590 char *prop_sec_name;
9593 group_name = elf_group_name (sec);
9596 suffix = strrchr (sec->name, '.');
9597 if (suffix == sec->name)
9599 prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1
9600 + (suffix ? strlen (suffix) : 0));
9601 strcpy (prop_sec_name, base_name);
9603 strcat (prop_sec_name, suffix);
9605 else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9607 char *linkonce_kind = 0;
9609 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9610 linkonce_kind = "x.";
9611 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9612 linkonce_kind = "p.";
9613 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9614 linkonce_kind = "prop.";
9618 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9619 + strlen (linkonce_kind) + 1);
9620 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9621 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9623 suffix = sec->name + linkonce_len;
9624 /* For backward compatibility, replace "t." instead of inserting
9625 the new linkonce_kind (but not for "prop" sections). */
9626 if (CONST_STRNEQ (suffix, "t.") && linkonce_kind[1] == '.')
9628 strcat (prop_sec_name + linkonce_len, suffix);
9631 prop_sec_name = strdup (base_name);
9633 /* Check if the section already exists. */
9634 prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name,
9635 match_section_group,
9636 (void *) group_name);
9637 /* If not, create it. */
9640 flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY);
9641 flags |= (bfd_get_section_flags (sec->owner, sec)
9642 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES));
9644 prop_sec = bfd_make_section_anyway_with_flags
9645 (sec->owner, strdup (prop_sec_name), flags);
9649 elf_group_name (prop_sec) = group_name;
9652 free (prop_sec_name);
9658 xtensa_get_property_predef_flags (asection *sec)
9660 if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME)
9661 || CONST_STRNEQ (sec->name, ".gnu.linkonce.x."))
9662 return (XTENSA_PROP_INSN
9663 | XTENSA_PROP_INSN_NO_TRANSFORM
9664 | XTENSA_PROP_INSN_NO_REORDER);
9666 if (xtensa_is_littable_section (sec))
9667 return (XTENSA_PROP_LITERAL
9668 | XTENSA_PROP_INSN_NO_TRANSFORM
9669 | XTENSA_PROP_INSN_NO_REORDER);
9675 /* Other functions called directly by the linker. */
9678 xtensa_callback_required_dependence (bfd *abfd,
9680 struct bfd_link_info *link_info,
9681 deps_callback_t callback,
9684 Elf_Internal_Rela *internal_relocs;
9687 bfd_boolean ok = TRUE;
9688 bfd_size_type sec_size;
9690 sec_size = bfd_get_section_limit (abfd, sec);
9692 /* ".plt*" sections have no explicit relocations but they contain L32R
9693 instructions that reference the corresponding ".got.plt*" sections. */
9694 if ((sec->flags & SEC_LINKER_CREATED) != 0
9695 && CONST_STRNEQ (sec->name, ".plt"))
9699 /* Find the corresponding ".got.plt*" section. */
9700 if (sec->name[4] == '\0')
9701 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9707 BFD_ASSERT (sec->name[4] == '.');
9708 chunk = strtol (&sec->name[5], NULL, 10);
9710 sprintf (got_name, ".got.plt.%u", chunk);
9711 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9713 BFD_ASSERT (sgotplt);
9715 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9716 section referencing a literal at the very beginning of
9717 ".got.plt". This is very close to the real dependence, anyway. */
9718 (*callback) (sec, sec_size, sgotplt, 0, closure);
9721 internal_relocs = retrieve_internal_relocs (abfd, sec,
9722 link_info->keep_memory);
9723 if (internal_relocs == NULL
9724 || sec->reloc_count == 0)
9727 /* Cache the contents for the duration of this scan. */
9728 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9729 if (contents == NULL && sec_size != 0)
9735 if (!xtensa_default_isa)
9736 xtensa_default_isa = xtensa_isa_init (0, 0);
9738 for (i = 0; i < sec->reloc_count; i++)
9740 Elf_Internal_Rela *irel = &internal_relocs[i];
9741 if (is_l32r_relocation (abfd, sec, contents, irel))
9744 asection *target_sec;
9745 bfd_vma target_offset;
9747 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9750 /* L32Rs must be local to the input file. */
9751 if (r_reloc_is_defined (&l32r_rel))
9753 target_sec = r_reloc_get_section (&l32r_rel);
9754 target_offset = l32r_rel.target_offset;
9756 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9762 release_internal_relocs (sec, internal_relocs);
9763 release_contents (sec, contents);
9767 /* The default literal sections should always be marked as "code" (i.e.,
9768 SHF_EXECINSTR). This is particularly important for the Linux kernel
9769 module loader so that the literals are not placed after the text. */
9770 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9772 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9773 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9774 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9775 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 },
9776 { NULL, 0, 0, 0, 0 }
9780 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9781 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9782 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9783 #define TARGET_BIG_NAME "elf32-xtensa-be"
9784 #define ELF_ARCH bfd_arch_xtensa
9786 #define ELF_MACHINE_CODE EM_XTENSA
9787 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9790 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9791 #else /* !XCHAL_HAVE_MMU */
9792 #define ELF_MAXPAGESIZE 1
9793 #endif /* !XCHAL_HAVE_MMU */
9794 #endif /* ELF_ARCH */
9796 #define elf_backend_can_gc_sections 1
9797 #define elf_backend_can_refcount 1
9798 #define elf_backend_plt_readonly 1
9799 #define elf_backend_got_header_size 4
9800 #define elf_backend_want_dynbss 0
9801 #define elf_backend_want_got_plt 1
9803 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9805 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9806 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9807 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9808 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9809 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9810 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9811 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9813 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9814 #define elf_backend_check_relocs elf_xtensa_check_relocs
9815 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9816 #define elf_backend_discard_info elf_xtensa_discard_info
9817 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9818 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9819 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9820 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9821 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9822 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9823 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9824 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9825 #define elf_backend_object_p elf_xtensa_object_p
9826 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9827 #define elf_backend_relocate_section elf_xtensa_relocate_section
9828 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9829 #define elf_backend_omit_section_dynsym \
9830 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9831 #define elf_backend_special_sections elf_xtensa_special_sections
9832 #define elf_backend_action_discarded elf_xtensa_action_discarded
9834 #include "elf32-target.h"