1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005 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 (bfd *, 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 (bfd *, int);
98 static asection *elf_xtensa_get_gotplt_section (bfd *, 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 char *xtensa_get_property_section_name (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 /* Total count of PLT relocations seen during check_relocs.
136 The actual PLT code must be split into multiple sections and all
137 the sections have to be created before size_dynamic_sections,
138 where we figure out the exact number of PLT entries that will be
139 needed. It is OK if this count is an overestimate, e.g., some
140 relocations may be removed by GC. */
142 static int plt_reloc_count = 0;
145 /* The GNU tools do not easily allow extending interfaces to pass around
146 the pointer to the Xtensa ISA information, so instead we add a global
147 variable here (in BFD) that can be used by any of the tools that need
150 xtensa_isa xtensa_default_isa;
153 /* When this is true, relocations may have been modified to refer to
154 symbols from other input files. The per-section list of "fix"
155 records needs to be checked when resolving relocations. */
157 static bfd_boolean relaxing_section = FALSE;
159 /* When this is true, during final links, literals that cannot be
160 coalesced and their relocations may be moved to other sections. */
162 int elf32xtensa_no_literal_movement = 1;
165 static reloc_howto_type elf_howto_table[] =
167 HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
168 bfd_elf_xtensa_reloc, "R_XTENSA_NONE",
169 FALSE, 0x00000000, 0x00000000, FALSE),
170 HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_xtensa_reloc, "R_XTENSA_32",
172 TRUE, 0xffffffff, 0xffffffff, FALSE),
173 /* Replace a 32-bit value with a value from the runtime linker (only
174 used by linker-generated stub functions). The r_addend value is
175 special: 1 means to substitute a pointer to the runtime linker's
176 dynamic resolver function; 2 means to substitute the link map for
177 the shared object. */
178 HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont,
179 NULL, "R_XTENSA_RTLD",
180 FALSE, 0x00000000, 0x00000000, FALSE),
181 HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
182 bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT",
183 FALSE, 0xffffffff, 0xffffffff, FALSE),
184 HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT",
186 FALSE, 0xffffffff, 0xffffffff, FALSE),
187 HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
188 bfd_elf_generic_reloc, "R_XTENSA_RELATIVE",
189 FALSE, 0xffffffff, 0xffffffff, FALSE),
190 HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
191 bfd_elf_xtensa_reloc, "R_XTENSA_PLT",
192 FALSE, 0xffffffff, 0xffffffff, FALSE),
194 HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont,
195 bfd_elf_xtensa_reloc, "R_XTENSA_OP0",
196 FALSE, 0x00000000, 0x00000000, TRUE),
197 HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont,
198 bfd_elf_xtensa_reloc, "R_XTENSA_OP1",
199 FALSE, 0x00000000, 0x00000000, TRUE),
200 HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont,
201 bfd_elf_xtensa_reloc, "R_XTENSA_OP2",
202 FALSE, 0x00000000, 0x00000000, TRUE),
203 /* Assembly auto-expansion. */
204 HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont,
205 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND",
206 FALSE, 0x00000000, 0x00000000, FALSE),
207 /* Relax assembly auto-expansion. */
208 HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont,
209 bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY",
210 FALSE, 0x00000000, 0x00000000, TRUE),
213 /* GNU extension to record C++ vtable hierarchy. */
214 HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont,
215 NULL, "R_XTENSA_GNU_VTINHERIT",
216 FALSE, 0x00000000, 0x00000000, FALSE),
217 /* GNU extension to record C++ vtable member usage. */
218 HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont,
219 _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY",
220 FALSE, 0x00000000, 0x00000000, FALSE),
222 /* Relocations for supporting difference of symbols. */
223 HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
224 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8",
225 FALSE, 0xffffffff, 0xffffffff, FALSE),
226 HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
227 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16",
228 FALSE, 0xffffffff, 0xffffffff, FALSE),
229 HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
230 bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32",
231 FALSE, 0xffffffff, 0xffffffff, FALSE),
233 /* General immediate operand relocations. */
234 HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
235 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP",
236 FALSE, 0x00000000, 0x00000000, TRUE),
237 HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
238 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP",
239 FALSE, 0x00000000, 0x00000000, TRUE),
240 HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
241 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP",
242 FALSE, 0x00000000, 0x00000000, TRUE),
243 HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
244 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP",
245 FALSE, 0x00000000, 0x00000000, TRUE),
246 HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
247 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP",
248 FALSE, 0x00000000, 0x00000000, TRUE),
249 HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
250 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP",
251 FALSE, 0x00000000, 0x00000000, TRUE),
252 HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
253 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP",
254 FALSE, 0x00000000, 0x00000000, TRUE),
255 HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
256 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP",
257 FALSE, 0x00000000, 0x00000000, TRUE),
258 HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
259 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP",
260 FALSE, 0x00000000, 0x00000000, TRUE),
261 HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
262 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP",
263 FALSE, 0x00000000, 0x00000000, TRUE),
264 HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
265 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP",
266 FALSE, 0x00000000, 0x00000000, TRUE),
267 HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
268 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP",
269 FALSE, 0x00000000, 0x00000000, TRUE),
270 HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
271 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP",
272 FALSE, 0x00000000, 0x00000000, TRUE),
273 HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
274 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP",
275 FALSE, 0x00000000, 0x00000000, TRUE),
276 HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont,
277 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP",
278 FALSE, 0x00000000, 0x00000000, TRUE),
280 /* "Alternate" relocations. The meaning of these is opcode-specific. */
281 HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
282 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT",
283 FALSE, 0x00000000, 0x00000000, TRUE),
284 HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
285 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT",
286 FALSE, 0x00000000, 0x00000000, TRUE),
287 HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
288 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT",
289 FALSE, 0x00000000, 0x00000000, TRUE),
290 HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
291 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT",
292 FALSE, 0x00000000, 0x00000000, TRUE),
293 HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
294 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT",
295 FALSE, 0x00000000, 0x00000000, TRUE),
296 HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
297 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT",
298 FALSE, 0x00000000, 0x00000000, TRUE),
299 HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
300 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT",
301 FALSE, 0x00000000, 0x00000000, TRUE),
302 HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
303 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT",
304 FALSE, 0x00000000, 0x00000000, TRUE),
305 HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
306 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT",
307 FALSE, 0x00000000, 0x00000000, TRUE),
308 HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
309 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT",
310 FALSE, 0x00000000, 0x00000000, TRUE),
311 HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
312 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT",
313 FALSE, 0x00000000, 0x00000000, TRUE),
314 HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
315 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT",
316 FALSE, 0x00000000, 0x00000000, TRUE),
317 HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
318 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT",
319 FALSE, 0x00000000, 0x00000000, TRUE),
320 HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
321 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT",
322 FALSE, 0x00000000, 0x00000000, TRUE),
323 HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont,
324 bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT",
325 FALSE, 0x00000000, 0x00000000, TRUE)
330 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
335 static reloc_howto_type *
336 elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
337 bfd_reloc_code_real_type code)
342 TRACE ("BFD_RELOC_NONE");
343 return &elf_howto_table[(unsigned) R_XTENSA_NONE ];
346 TRACE ("BFD_RELOC_32");
347 return &elf_howto_table[(unsigned) R_XTENSA_32 ];
349 case BFD_RELOC_XTENSA_DIFF8:
350 TRACE ("BFD_RELOC_XTENSA_DIFF8");
351 return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ];
353 case BFD_RELOC_XTENSA_DIFF16:
354 TRACE ("BFD_RELOC_XTENSA_DIFF16");
355 return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ];
357 case BFD_RELOC_XTENSA_DIFF32:
358 TRACE ("BFD_RELOC_XTENSA_DIFF32");
359 return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ];
361 case BFD_RELOC_XTENSA_RTLD:
362 TRACE ("BFD_RELOC_XTENSA_RTLD");
363 return &elf_howto_table[(unsigned) R_XTENSA_RTLD ];
365 case BFD_RELOC_XTENSA_GLOB_DAT:
366 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
367 return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ];
369 case BFD_RELOC_XTENSA_JMP_SLOT:
370 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
371 return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ];
373 case BFD_RELOC_XTENSA_RELATIVE:
374 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
375 return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ];
377 case BFD_RELOC_XTENSA_PLT:
378 TRACE ("BFD_RELOC_XTENSA_PLT");
379 return &elf_howto_table[(unsigned) R_XTENSA_PLT ];
381 case BFD_RELOC_XTENSA_OP0:
382 TRACE ("BFD_RELOC_XTENSA_OP0");
383 return &elf_howto_table[(unsigned) R_XTENSA_OP0 ];
385 case BFD_RELOC_XTENSA_OP1:
386 TRACE ("BFD_RELOC_XTENSA_OP1");
387 return &elf_howto_table[(unsigned) R_XTENSA_OP1 ];
389 case BFD_RELOC_XTENSA_OP2:
390 TRACE ("BFD_RELOC_XTENSA_OP2");
391 return &elf_howto_table[(unsigned) R_XTENSA_OP2 ];
393 case BFD_RELOC_XTENSA_ASM_EXPAND:
394 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
395 return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ];
397 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
398 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
399 return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ];
401 case BFD_RELOC_VTABLE_INHERIT:
402 TRACE ("BFD_RELOC_VTABLE_INHERIT");
403 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ];
405 case BFD_RELOC_VTABLE_ENTRY:
406 TRACE ("BFD_RELOC_VTABLE_ENTRY");
407 return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ];
410 if (code >= BFD_RELOC_XTENSA_SLOT0_OP
411 && code <= BFD_RELOC_XTENSA_SLOT14_OP)
413 unsigned n = (R_XTENSA_SLOT0_OP +
414 (code - BFD_RELOC_XTENSA_SLOT0_OP));
415 return &elf_howto_table[n];
418 if (code >= BFD_RELOC_XTENSA_SLOT0_ALT
419 && code <= BFD_RELOC_XTENSA_SLOT14_ALT)
421 unsigned n = (R_XTENSA_SLOT0_ALT +
422 (code - BFD_RELOC_XTENSA_SLOT0_ALT));
423 return &elf_howto_table[n];
434 /* Given an ELF "rela" relocation, find the corresponding howto and record
435 it in the BFD internal arelent representation of the relocation. */
438 elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
440 Elf_Internal_Rela *dst)
442 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
444 BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max);
445 cache_ptr->howto = &elf_howto_table[r_type];
449 /* Functions for the Xtensa ELF linker. */
451 /* The name of the dynamic interpreter. This is put in the .interp
454 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
456 /* The size in bytes of an entry in the procedure linkage table.
457 (This does _not_ include the space for the literals associated with
460 #define PLT_ENTRY_SIZE 16
462 /* For _really_ large PLTs, we may need to alternate between literals
463 and code to keep the literals within the 256K range of the L32R
464 instructions in the code. It's unlikely that anyone would ever need
465 such a big PLT, but an arbitrary limit on the PLT size would be bad.
466 Thus, we split the PLT into chunks. Since there's very little
467 overhead (2 extra literals) for each chunk, the chunk size is kept
468 small so that the code for handling multiple chunks get used and
469 tested regularly. With 254 entries, there are 1K of literals for
470 each chunk, and that seems like a nice round number. */
472 #define PLT_ENTRIES_PER_CHUNK 254
474 /* PLT entries are actually used as stub functions for lazy symbol
475 resolution. Once the symbol is resolved, the stub function is never
476 invoked. Note: the 32-byte frame size used here cannot be changed
477 without a corresponding change in the runtime linker. */
479 static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] =
481 0x6c, 0x10, 0x04, /* entry sp, 32 */
482 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
483 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
484 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
485 0x0a, 0x80, 0x00, /* jx a8 */
489 static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] =
491 0x36, 0x41, 0x00, /* entry sp, 32 */
492 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
493 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
494 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
495 0xa0, 0x08, 0x00, /* jx a8 */
500 static inline bfd_boolean
501 xtensa_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
502 struct bfd_link_info *info)
504 /* Check if we should do dynamic things to this symbol. The
505 "ignore_protected" argument need not be set, because Xtensa code
506 does not require special handling of STV_PROTECTED to make function
507 pointer comparisons work properly. The PLT addresses are never
508 used for function pointers. */
510 return _bfd_elf_dynamic_symbol_p (h, info, 0);
515 property_table_compare (const void *ap, const void *bp)
517 const property_table_entry *a = (const property_table_entry *) ap;
518 const property_table_entry *b = (const property_table_entry *) bp;
520 if (a->address == b->address)
522 if (a->size != b->size)
523 return (a->size - b->size);
525 if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN))
526 return ((b->flags & XTENSA_PROP_ALIGN)
527 - (a->flags & XTENSA_PROP_ALIGN));
529 if ((a->flags & XTENSA_PROP_ALIGN)
530 && (GET_XTENSA_PROP_ALIGNMENT (a->flags)
531 != GET_XTENSA_PROP_ALIGNMENT (b->flags)))
532 return (GET_XTENSA_PROP_ALIGNMENT (a->flags)
533 - GET_XTENSA_PROP_ALIGNMENT (b->flags));
535 if ((a->flags & XTENSA_PROP_UNREACHABLE)
536 != (b->flags & XTENSA_PROP_UNREACHABLE))
537 return ((b->flags & XTENSA_PROP_UNREACHABLE)
538 - (a->flags & XTENSA_PROP_UNREACHABLE));
540 return (a->flags - b->flags);
543 return (a->address - b->address);
548 property_table_matches (const void *ap, const void *bp)
550 const property_table_entry *a = (const property_table_entry *) ap;
551 const property_table_entry *b = (const property_table_entry *) bp;
553 /* Check if one entry overlaps with the other. */
554 if ((b->address >= a->address && b->address < (a->address + a->size))
555 || (a->address >= b->address && a->address < (b->address + b->size)))
558 return (a->address - b->address);
562 /* Get the literal table or property table entries for the given
563 section. Sets TABLE_P and returns the number of entries. On
564 error, returns a negative value. */
567 xtensa_read_table_entries (bfd *abfd,
569 property_table_entry **table_p,
570 const char *sec_name,
571 bfd_boolean output_addr)
573 asection *table_section;
574 char *table_section_name;
575 bfd_size_type table_size = 0;
576 bfd_byte *table_data;
577 property_table_entry *blocks;
578 int blk, block_count;
579 bfd_size_type num_records;
580 Elf_Internal_Rela *internal_relocs;
581 bfd_vma section_addr;
582 flagword predef_flags;
583 bfd_size_type table_entry_size;
586 || !(section->flags & SEC_ALLOC)
587 || (section->flags & SEC_DEBUGGING))
593 table_section_name = xtensa_get_property_section_name (section, sec_name);
594 table_section = bfd_get_section_by_name (abfd, table_section_name);
595 free (table_section_name);
597 table_size = table_section->size;
605 predef_flags = xtensa_get_property_predef_flags (table_section);
606 table_entry_size = 12;
608 table_entry_size -= 4;
610 num_records = table_size / table_entry_size;
611 table_data = retrieve_contents (abfd, table_section, TRUE);
612 blocks = (property_table_entry *)
613 bfd_malloc (num_records * sizeof (property_table_entry));
617 section_addr = section->output_section->vma + section->output_offset;
619 section_addr = section->vma;
621 /* If the file has not yet been relocated, process the relocations
622 and sort out the table entries that apply to the specified section. */
623 internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE);
624 if (internal_relocs && !table_section->reloc_done)
628 for (i = 0; i < table_section->reloc_count; i++)
630 Elf_Internal_Rela *rel = &internal_relocs[i];
631 unsigned long r_symndx;
633 if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE)
636 BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32);
637 r_symndx = ELF32_R_SYM (rel->r_info);
639 if (get_elf_r_symndx_section (abfd, r_symndx) == section)
641 bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx);
642 BFD_ASSERT (sym_off == 0);
643 BFD_ASSERT (rel->r_addend == 0);
644 blocks[block_count].address =
645 (section_addr + sym_off + rel->r_addend
646 + bfd_get_32 (abfd, table_data + rel->r_offset));
647 blocks[block_count].size =
648 bfd_get_32 (abfd, table_data + rel->r_offset + 4);
650 blocks[block_count].flags = predef_flags;
652 blocks[block_count].flags =
653 bfd_get_32 (abfd, table_data + rel->r_offset + 8);
660 /* The file has already been relocated and the addresses are
661 already in the table. */
663 bfd_size_type section_limit = bfd_get_section_limit (abfd, section);
665 for (off = 0; off < table_size; off += table_entry_size)
667 bfd_vma address = bfd_get_32 (abfd, table_data + off);
669 if (address >= section_addr
670 && address < section_addr + section_limit)
672 blocks[block_count].address = address;
673 blocks[block_count].size =
674 bfd_get_32 (abfd, table_data + off + 4);
676 blocks[block_count].flags = predef_flags;
678 blocks[block_count].flags =
679 bfd_get_32 (abfd, table_data + off + 8);
685 release_contents (table_section, table_data);
686 release_internal_relocs (table_section, internal_relocs);
690 /* Now sort them into address order for easy reference. */
691 qsort (blocks, block_count, sizeof (property_table_entry),
692 property_table_compare);
694 /* Check that the table contents are valid. Problems may occur,
695 for example, if an unrelocated object file is stripped. */
696 for (blk = 1; blk < block_count; blk++)
698 /* The only circumstance where two entries may legitimately
699 have the same address is when one of them is a zero-size
700 placeholder to mark a place where fill can be inserted.
701 The zero-size entry should come first. */
702 if (blocks[blk - 1].address == blocks[blk].address &&
703 blocks[blk - 1].size != 0)
705 (*_bfd_error_handler) (_("%B(%A): invalid property table"),
707 bfd_set_error (bfd_error_bad_value);
719 static property_table_entry *
720 elf_xtensa_find_property_entry (property_table_entry *property_table,
721 int property_table_size,
724 property_table_entry entry;
725 property_table_entry *rv;
727 if (property_table_size == 0)
730 entry.address = addr;
734 rv = bsearch (&entry, property_table, property_table_size,
735 sizeof (property_table_entry), property_table_matches);
741 elf_xtensa_in_literal_pool (property_table_entry *lit_table,
745 if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr))
752 /* Look through the relocs for a section during the first phase, and
753 calculate needed space in the dynamic reloc sections. */
756 elf_xtensa_check_relocs (bfd *abfd,
757 struct bfd_link_info *info,
759 const Elf_Internal_Rela *relocs)
761 Elf_Internal_Shdr *symtab_hdr;
762 struct elf_link_hash_entry **sym_hashes;
763 const Elf_Internal_Rela *rel;
764 const Elf_Internal_Rela *rel_end;
766 if (info->relocatable)
769 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
770 sym_hashes = elf_sym_hashes (abfd);
772 rel_end = relocs + sec->reloc_count;
773 for (rel = relocs; rel < rel_end; rel++)
776 unsigned long r_symndx;
777 struct elf_link_hash_entry *h;
779 r_symndx = ELF32_R_SYM (rel->r_info);
780 r_type = ELF32_R_TYPE (rel->r_info);
782 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
784 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
789 if (r_symndx < symtab_hdr->sh_info)
793 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
794 while (h->root.type == bfd_link_hash_indirect
795 || h->root.type == bfd_link_hash_warning)
796 h = (struct elf_link_hash_entry *) h->root.u.i.link;
805 if ((sec->flags & SEC_ALLOC) != 0)
807 if (h->got.refcount <= 0)
810 h->got.refcount += 1;
815 /* If this relocation is against a local symbol, then it's
816 exactly the same as a normal local GOT entry. */
820 if ((sec->flags & SEC_ALLOC) != 0)
822 if (h->plt.refcount <= 0)
828 h->plt.refcount += 1;
830 /* Keep track of the total PLT relocation count even if we
831 don't yet know whether the dynamic sections will be
833 plt_reloc_count += 1;
835 if (elf_hash_table (info)->dynamic_sections_created)
837 if (!add_extra_plt_sections (elf_hash_table (info)->dynobj,
845 if ((sec->flags & SEC_ALLOC) != 0)
847 bfd_signed_vma *local_got_refcounts;
849 /* This is a global offset table entry for a local symbol. */
850 local_got_refcounts = elf_local_got_refcounts (abfd);
851 if (local_got_refcounts == NULL)
855 size = symtab_hdr->sh_info;
856 size *= sizeof (bfd_signed_vma);
857 local_got_refcounts =
858 (bfd_signed_vma *) bfd_zalloc (abfd, size);
859 if (local_got_refcounts == NULL)
861 elf_local_got_refcounts (abfd) = local_got_refcounts;
863 local_got_refcounts[r_symndx] += 1;
870 case R_XTENSA_SLOT0_OP:
871 case R_XTENSA_SLOT1_OP:
872 case R_XTENSA_SLOT2_OP:
873 case R_XTENSA_SLOT3_OP:
874 case R_XTENSA_SLOT4_OP:
875 case R_XTENSA_SLOT5_OP:
876 case R_XTENSA_SLOT6_OP:
877 case R_XTENSA_SLOT7_OP:
878 case R_XTENSA_SLOT8_OP:
879 case R_XTENSA_SLOT9_OP:
880 case R_XTENSA_SLOT10_OP:
881 case R_XTENSA_SLOT11_OP:
882 case R_XTENSA_SLOT12_OP:
883 case R_XTENSA_SLOT13_OP:
884 case R_XTENSA_SLOT14_OP:
885 case R_XTENSA_SLOT0_ALT:
886 case R_XTENSA_SLOT1_ALT:
887 case R_XTENSA_SLOT2_ALT:
888 case R_XTENSA_SLOT3_ALT:
889 case R_XTENSA_SLOT4_ALT:
890 case R_XTENSA_SLOT5_ALT:
891 case R_XTENSA_SLOT6_ALT:
892 case R_XTENSA_SLOT7_ALT:
893 case R_XTENSA_SLOT8_ALT:
894 case R_XTENSA_SLOT9_ALT:
895 case R_XTENSA_SLOT10_ALT:
896 case R_XTENSA_SLOT11_ALT:
897 case R_XTENSA_SLOT12_ALT:
898 case R_XTENSA_SLOT13_ALT:
899 case R_XTENSA_SLOT14_ALT:
900 case R_XTENSA_ASM_EXPAND:
901 case R_XTENSA_ASM_SIMPLIFY:
903 case R_XTENSA_DIFF16:
904 case R_XTENSA_DIFF32:
905 /* Nothing to do for these. */
908 case R_XTENSA_GNU_VTINHERIT:
909 /* This relocation describes the C++ object vtable hierarchy.
910 Reconstruct it for later use during GC. */
911 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
915 case R_XTENSA_GNU_VTENTRY:
916 /* This relocation describes which C++ vtable entries are actually
917 used. Record for later use during GC. */
918 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
932 elf_xtensa_make_sym_local (struct bfd_link_info *info,
933 struct elf_link_hash_entry *h)
937 if (h->plt.refcount > 0)
939 /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */
940 if (h->got.refcount < 0)
942 h->got.refcount += h->plt.refcount;
948 /* Don't need any dynamic relocations at all. */
956 elf_xtensa_hide_symbol (struct bfd_link_info *info,
957 struct elf_link_hash_entry *h,
958 bfd_boolean force_local)
960 /* For a shared link, move the plt refcount to the got refcount to leave
961 space for RELATIVE relocs. */
962 elf_xtensa_make_sym_local (info, h);
964 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
968 /* Return the section that should be marked against GC for a given
972 elf_xtensa_gc_mark_hook (asection *sec,
973 struct bfd_link_info *info ATTRIBUTE_UNUSED,
974 Elf_Internal_Rela *rel,
975 struct elf_link_hash_entry *h,
976 Elf_Internal_Sym *sym)
980 switch (ELF32_R_TYPE (rel->r_info))
982 case R_XTENSA_GNU_VTINHERIT:
983 case R_XTENSA_GNU_VTENTRY:
987 switch (h->root.type)
989 case bfd_link_hash_defined:
990 case bfd_link_hash_defweak:
991 return h->root.u.def.section;
993 case bfd_link_hash_common:
994 return h->root.u.c.p->section;
1002 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1008 /* Update the GOT & PLT entry reference counts
1009 for the section being removed. */
1012 elf_xtensa_gc_sweep_hook (bfd *abfd,
1013 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1015 const Elf_Internal_Rela *relocs)
1017 Elf_Internal_Shdr *symtab_hdr;
1018 struct elf_link_hash_entry **sym_hashes;
1019 bfd_signed_vma *local_got_refcounts;
1020 const Elf_Internal_Rela *rel, *relend;
1022 if ((sec->flags & SEC_ALLOC) == 0)
1025 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1026 sym_hashes = elf_sym_hashes (abfd);
1027 local_got_refcounts = elf_local_got_refcounts (abfd);
1029 relend = relocs + sec->reloc_count;
1030 for (rel = relocs; rel < relend; rel++)
1032 unsigned long r_symndx;
1033 unsigned int r_type;
1034 struct elf_link_hash_entry *h = NULL;
1036 r_symndx = ELF32_R_SYM (rel->r_info);
1037 if (r_symndx >= symtab_hdr->sh_info)
1039 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1040 while (h->root.type == bfd_link_hash_indirect
1041 || h->root.type == bfd_link_hash_warning)
1042 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1045 r_type = ELF32_R_TYPE (rel->r_info);
1051 if (h->got.refcount > 0)
1058 if (h->plt.refcount > 0)
1063 if (local_got_refcounts[r_symndx] > 0)
1064 local_got_refcounts[r_symndx] -= 1;
1076 /* Create all the dynamic sections. */
1079 elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1081 flagword flags, noalloc_flags;
1084 /* First do all the standard stuff. */
1085 if (! _bfd_elf_create_dynamic_sections (dynobj, info))
1088 /* Create any extra PLT sections in case check_relocs has already
1089 been called on all the non-dynamic input files. */
1090 if (!add_extra_plt_sections (dynobj, plt_reloc_count))
1093 noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1094 | SEC_LINKER_CREATED | SEC_READONLY);
1095 flags = noalloc_flags | SEC_ALLOC | SEC_LOAD;
1097 /* Mark the ".got.plt" section READONLY. */
1098 s = bfd_get_section_by_name (dynobj, ".got.plt");
1100 || ! bfd_set_section_flags (dynobj, s, flags))
1103 /* Create ".rela.got". */
1104 s = bfd_make_section_with_flags (dynobj, ".rela.got", flags);
1106 || ! bfd_set_section_alignment (dynobj, s, 2))
1109 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1110 s = bfd_make_section_with_flags (dynobj, ".got.loc", flags);
1112 || ! bfd_set_section_alignment (dynobj, s, 2))
1115 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1116 s = bfd_make_section_with_flags (dynobj, ".xt.lit.plt",
1119 || ! bfd_set_section_alignment (dynobj, s, 2))
1127 add_extra_plt_sections (bfd *dynobj, int count)
1131 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1132 ".got.plt" sections. */
1133 for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--)
1139 /* Stop when we find a section has already been created. */
1140 if (elf_xtensa_get_plt_section (dynobj, chunk))
1143 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1144 | SEC_LINKER_CREATED | SEC_READONLY);
1146 sname = (char *) bfd_malloc (10);
1147 sprintf (sname, ".plt.%u", chunk);
1148 s = bfd_make_section_with_flags (dynobj, sname,
1151 || ! bfd_set_section_alignment (dynobj, s, 2))
1154 sname = (char *) bfd_malloc (14);
1155 sprintf (sname, ".got.plt.%u", chunk);
1156 s = bfd_make_section_with_flags (dynobj, sname, flags);
1158 || ! bfd_set_section_alignment (dynobj, s, 2))
1166 /* Adjust a symbol defined by a dynamic object and referenced by a
1167 regular object. The current definition is in some section of the
1168 dynamic object, but we're not including those sections. We have to
1169 change the definition to something the rest of the link can
1173 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1174 struct elf_link_hash_entry *h)
1176 /* If this is a weak symbol, and there is a real definition, the
1177 processor independent code will have arranged for us to see the
1178 real definition first, and we can just use the same value. */
1181 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1182 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1183 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1184 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1188 /* This is a reference to a symbol defined by a dynamic object. The
1189 reference must go through the GOT, so there's no need for COPY relocs,
1197 elf_xtensa_fix_refcounts (struct elf_link_hash_entry *h, void *arg)
1199 struct bfd_link_info *info = (struct bfd_link_info *) arg;
1201 if (h->root.type == bfd_link_hash_warning)
1202 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1204 if (! xtensa_elf_dynamic_symbol_p (h, info))
1205 elf_xtensa_make_sym_local (info, h);
1212 elf_xtensa_allocate_plt_size (struct elf_link_hash_entry *h, void *arg)
1214 asection *srelplt = (asection *) arg;
1216 if (h->root.type == bfd_link_hash_warning)
1217 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1219 if (h->plt.refcount > 0)
1220 srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela));
1227 elf_xtensa_allocate_got_size (struct elf_link_hash_entry *h, void *arg)
1229 asection *srelgot = (asection *) arg;
1231 if (h->root.type == bfd_link_hash_warning)
1232 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1234 if (h->got.refcount > 0)
1235 srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela));
1242 elf_xtensa_allocate_local_got_size (struct bfd_link_info *info,
1247 for (i = info->input_bfds; i; i = i->link_next)
1249 bfd_signed_vma *local_got_refcounts;
1250 bfd_size_type j, cnt;
1251 Elf_Internal_Shdr *symtab_hdr;
1253 local_got_refcounts = elf_local_got_refcounts (i);
1254 if (!local_got_refcounts)
1257 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1258 cnt = symtab_hdr->sh_info;
1260 for (j = 0; j < cnt; ++j)
1262 if (local_got_refcounts[j] > 0)
1263 srelgot->size += (local_got_refcounts[j]
1264 * sizeof (Elf32_External_Rela));
1270 /* Set the sizes of the dynamic sections. */
1273 elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1274 struct bfd_link_info *info)
1277 asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc;
1278 bfd_boolean relplt, relgot;
1279 int plt_entries, plt_chunks, chunk;
1285 dynobj = elf_hash_table (info)->dynobj;
1289 if (elf_hash_table (info)->dynamic_sections_created)
1291 /* Set the contents of the .interp section to the interpreter. */
1292 if (info->executable)
1294 s = bfd_get_section_by_name (dynobj, ".interp");
1297 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1298 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1301 /* Allocate room for one word in ".got". */
1302 s = bfd_get_section_by_name (dynobj, ".got");
1307 /* Adjust refcounts for symbols that we now know are not "dynamic". */
1308 elf_link_hash_traverse (elf_hash_table (info),
1309 elf_xtensa_fix_refcounts,
1312 /* Allocate space in ".rela.got" for literals that reference
1314 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1315 if (srelgot == NULL)
1317 elf_link_hash_traverse (elf_hash_table (info),
1318 elf_xtensa_allocate_got_size,
1321 /* If we are generating a shared object, we also need space in
1322 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1323 reference local symbols. */
1325 elf_xtensa_allocate_local_got_size (info, srelgot);
1327 /* Allocate space in ".rela.plt" for literals that have PLT entries. */
1328 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1329 if (srelplt == NULL)
1331 elf_link_hash_traverse (elf_hash_table (info),
1332 elf_xtensa_allocate_plt_size,
1335 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1336 each PLT entry, we need the PLT code plus a 4-byte literal.
1337 For each chunk of ".plt", we also need two more 4-byte
1338 literals, two corresponding entries in ".rela.got", and an
1339 8-byte entry in ".xt.lit.plt". */
1340 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
1341 if (spltlittbl == NULL)
1344 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
1346 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
1348 /* Iterate over all the PLT chunks, including any extra sections
1349 created earlier because the initial count of PLT relocations
1350 was an overestimate. */
1352 (splt = elf_xtensa_get_plt_section (dynobj, chunk)) != NULL;
1357 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1358 if (sgotplt == NULL)
1361 if (chunk < plt_chunks - 1)
1362 chunk_entries = PLT_ENTRIES_PER_CHUNK;
1363 else if (chunk == plt_chunks - 1)
1364 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
1368 if (chunk_entries != 0)
1370 sgotplt->size = 4 * (chunk_entries + 2);
1371 splt->size = PLT_ENTRY_SIZE * chunk_entries;
1372 srelgot->size += 2 * sizeof (Elf32_External_Rela);
1373 spltlittbl->size += 8;
1382 /* Allocate space in ".got.loc" to match the total size of all the
1384 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
1385 if (sgotloc == NULL)
1387 sgotloc->size = spltlittbl->size;
1388 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
1390 if (abfd->flags & DYNAMIC)
1392 for (s = abfd->sections; s != NULL; s = s->next)
1394 if (! elf_discarded_section (s)
1395 && xtensa_is_littable_section (s)
1397 sgotloc->size += s->size;
1402 /* Allocate memory for dynamic sections. */
1405 for (s = dynobj->sections; s != NULL; s = s->next)
1409 if ((s->flags & SEC_LINKER_CREATED) == 0)
1412 /* It's OK to base decisions on the section name, because none
1413 of the dynobj section names depend upon the input files. */
1414 name = bfd_get_section_name (dynobj, s);
1416 if (strncmp (name, ".rela", 5) == 0)
1420 if (strcmp (name, ".rela.plt") == 0)
1422 else if (strcmp (name, ".rela.got") == 0)
1425 /* We use the reloc_count field as a counter if we need
1426 to copy relocs into the output file. */
1430 else if (strncmp (name, ".plt.", 5) != 0
1431 && strncmp (name, ".got.plt.", 9) != 0
1432 && strcmp (name, ".got") != 0
1433 && strcmp (name, ".plt") != 0
1434 && strcmp (name, ".got.plt") != 0
1435 && strcmp (name, ".xt.lit.plt") != 0
1436 && strcmp (name, ".got.loc") != 0)
1438 /* It's not one of our sections, so don't allocate space. */
1444 /* If we don't need this section, strip it from the output
1445 file. We must create the ".plt*" and ".got.plt*"
1446 sections in create_dynamic_sections and/or check_relocs
1447 based on a conservative estimate of the PLT relocation
1448 count, because the sections must be created before the
1449 linker maps input sections to output sections. The
1450 linker does that before size_dynamic_sections, where we
1451 compute the exact size of the PLT, so there may be more
1452 of these sections than are actually needed. */
1453 s->flags |= SEC_EXCLUDE;
1455 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
1457 /* Allocate memory for the section contents. */
1458 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1459 if (s->contents == NULL)
1464 if (elf_hash_table (info)->dynamic_sections_created)
1466 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1467 known until finish_dynamic_sections, but we need to get the relocs
1468 in place before they are sorted. */
1469 if (srelgot == NULL)
1471 for (chunk = 0; chunk < plt_chunks; chunk++)
1473 Elf_Internal_Rela irela;
1477 irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD);
1480 loc = (srelgot->contents
1481 + srelgot->reloc_count * sizeof (Elf32_External_Rela));
1482 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
1483 bfd_elf32_swap_reloca_out (output_bfd, &irela,
1484 loc + sizeof (Elf32_External_Rela));
1485 srelgot->reloc_count += 2;
1488 /* Add some entries to the .dynamic section. We fill in the
1489 values later, in elf_xtensa_finish_dynamic_sections, but we
1490 must add the entries now so that we get the correct size for
1491 the .dynamic section. The DT_DEBUG entry is filled in by the
1492 dynamic linker and used by the debugger. */
1493 #define add_dynamic_entry(TAG, VAL) \
1494 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1498 if (!add_dynamic_entry (DT_DEBUG, 0))
1504 if (!add_dynamic_entry (DT_PLTGOT, 0)
1505 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1506 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1507 || !add_dynamic_entry (DT_JMPREL, 0))
1513 if (!add_dynamic_entry (DT_RELA, 0)
1514 || !add_dynamic_entry (DT_RELASZ, 0)
1515 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1519 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0)
1520 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0))
1523 #undef add_dynamic_entry
1529 /* Remove any PT_LOAD segments with no allocated sections. Prior to
1530 binutils 2.13, this function used to remove the non-SEC_ALLOC
1531 sections from PT_LOAD segments, but that task has now been moved
1532 into elf.c. We still need this function to remove any empty
1533 segments that result, but there's nothing Xtensa-specific about
1534 this and it probably ought to be moved into elf.c as well. */
1537 elf_xtensa_modify_segment_map (bfd *abfd,
1538 struct bfd_link_info *info ATTRIBUTE_UNUSED)
1540 struct elf_segment_map **m_p;
1542 m_p = &elf_tdata (abfd)->segment_map;
1545 if ((*m_p)->p_type == PT_LOAD && (*m_p)->count == 0)
1546 *m_p = (*m_p)->next;
1548 m_p = &(*m_p)->next;
1554 /* Perform the specified relocation. The instruction at (contents + address)
1555 is modified to set one operand to represent the value in "relocation". The
1556 operand position is determined by the relocation type recorded in the
1559 #define CALL_SEGMENT_BITS (30)
1560 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1562 static bfd_reloc_status_type
1563 elf_xtensa_do_reloc (reloc_howto_type *howto,
1565 asection *input_section,
1569 bfd_boolean is_weak_undef,
1570 char **error_message)
1573 xtensa_opcode opcode;
1574 xtensa_isa isa = xtensa_default_isa;
1575 static xtensa_insnbuf ibuff = NULL;
1576 static xtensa_insnbuf sbuff = NULL;
1577 bfd_vma self_address = 0;
1578 bfd_size_type input_size;
1584 ibuff = xtensa_insnbuf_alloc (isa);
1585 sbuff = xtensa_insnbuf_alloc (isa);
1588 input_size = bfd_get_section_limit (abfd, input_section);
1590 switch (howto->type)
1593 case R_XTENSA_DIFF8:
1594 case R_XTENSA_DIFF16:
1595 case R_XTENSA_DIFF32:
1596 return bfd_reloc_ok;
1598 case R_XTENSA_ASM_EXPAND:
1601 /* Check for windowed CALL across a 1GB boundary. */
1602 xtensa_opcode opcode =
1603 get_expanded_call_opcode (contents + address,
1604 input_size - address, 0);
1605 if (is_windowed_call_opcode (opcode))
1607 self_address = (input_section->output_section->vma
1608 + input_section->output_offset
1610 if ((self_address >> CALL_SEGMENT_BITS)
1611 != (relocation >> CALL_SEGMENT_BITS))
1613 *error_message = "windowed longcall crosses 1GB boundary; "
1615 return bfd_reloc_dangerous;
1619 return bfd_reloc_ok;
1621 case R_XTENSA_ASM_SIMPLIFY:
1623 /* Convert the L32R/CALLX to CALL. */
1624 bfd_reloc_status_type retval =
1625 elf_xtensa_do_asm_simplify (contents, address, input_size,
1627 if (retval != bfd_reloc_ok)
1628 return bfd_reloc_dangerous;
1630 /* The CALL needs to be relocated. Continue below for that part. */
1632 howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ];
1640 x = bfd_get_32 (abfd, contents + address);
1642 bfd_put_32 (abfd, x, contents + address);
1644 return bfd_reloc_ok;
1647 /* Only instruction slot-specific relocations handled below.... */
1648 slot = get_relocation_slot (howto->type);
1649 if (slot == XTENSA_UNDEFINED)
1651 *error_message = "unexpected relocation";
1652 return bfd_reloc_dangerous;
1655 /* Read the instruction into a buffer and decode the opcode. */
1656 xtensa_insnbuf_from_chars (isa, ibuff, contents + address,
1657 input_size - address);
1658 fmt = xtensa_format_decode (isa, ibuff);
1659 if (fmt == XTENSA_UNDEFINED)
1661 *error_message = "cannot decode instruction format";
1662 return bfd_reloc_dangerous;
1665 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
1667 opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff);
1668 if (opcode == XTENSA_UNDEFINED)
1670 *error_message = "cannot decode instruction opcode";
1671 return bfd_reloc_dangerous;
1674 /* Check for opcode-specific "alternate" relocations. */
1675 if (is_alt_relocation (howto->type))
1677 if (opcode == get_l32r_opcode ())
1679 /* Handle the special-case of non-PC-relative L32R instructions. */
1680 bfd *output_bfd = input_section->output_section->owner;
1681 asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4");
1684 *error_message = "relocation references missing .lit4 section";
1685 return bfd_reloc_dangerous;
1687 self_address = ((lit4_sec->vma & ~0xfff)
1688 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1689 newval = relocation;
1692 else if (opcode == get_const16_opcode ())
1694 /* ALT used for high 16 bits. */
1695 newval = relocation >> 16;
1700 /* No other "alternate" relocations currently defined. */
1701 *error_message = "unexpected relocation";
1702 return bfd_reloc_dangerous;
1705 else /* Not an "alternate" relocation.... */
1707 if (opcode == get_const16_opcode ())
1709 newval = relocation & 0xffff;
1714 /* ...normal PC-relative relocation.... */
1716 /* Determine which operand is being relocated. */
1717 opnd = get_relocation_opnd (opcode, howto->type);
1718 if (opnd == XTENSA_UNDEFINED)
1720 *error_message = "unexpected relocation";
1721 return bfd_reloc_dangerous;
1724 if (!howto->pc_relative)
1726 *error_message = "expected PC-relative relocation";
1727 return bfd_reloc_dangerous;
1730 /* Calculate the PC address for this instruction. */
1731 self_address = (input_section->output_section->vma
1732 + input_section->output_offset
1735 newval = relocation;
1739 /* Apply the relocation. */
1740 if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address)
1741 || xtensa_operand_encode (isa, opcode, opnd, &newval)
1742 || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot,
1745 const char *opname = xtensa_opcode_name (isa, opcode);
1748 msg = "cannot encode";
1749 if (is_direct_call_opcode (opcode))
1751 if ((relocation & 0x3) != 0)
1752 msg = "misaligned call target";
1754 msg = "call target out of range";
1756 else if (opcode == get_l32r_opcode ())
1758 if ((relocation & 0x3) != 0)
1759 msg = "misaligned literal target";
1760 else if (is_alt_relocation (howto->type))
1761 msg = "literal target out of range (too many literals)";
1762 else if (self_address > relocation)
1763 msg = "literal target out of range (try using text-section-literals)";
1765 msg = "literal placed after use";
1768 *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg);
1769 return bfd_reloc_dangerous;
1772 /* Check for calls across 1GB boundaries. */
1773 if (is_direct_call_opcode (opcode)
1774 && is_windowed_call_opcode (opcode))
1776 if ((self_address >> CALL_SEGMENT_BITS)
1777 != (relocation >> CALL_SEGMENT_BITS))
1780 "windowed call crosses 1GB boundary; return may fail";
1781 return bfd_reloc_dangerous;
1785 /* Write the modified instruction back out of the buffer. */
1786 xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff);
1787 xtensa_insnbuf_to_chars (isa, ibuff, contents + address,
1788 input_size - address);
1789 return bfd_reloc_ok;
1794 vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...)
1796 /* To reduce the size of the memory leak,
1797 we only use a single message buffer. */
1798 static bfd_size_type alloc_size = 0;
1799 static char *message = NULL;
1800 bfd_size_type orig_len, len = 0;
1801 bfd_boolean is_append;
1803 VA_OPEN (ap, arglen);
1804 VA_FIXEDARG (ap, const char *, origmsg);
1806 is_append = (origmsg == message);
1808 orig_len = strlen (origmsg);
1809 len = orig_len + strlen (fmt) + arglen + 20;
1810 if (len > alloc_size)
1812 message = (char *) bfd_realloc (message, len);
1816 memcpy (message, origmsg, orig_len);
1817 vsprintf (message + orig_len, fmt, ap);
1823 /* This function is registered as the "special_function" in the
1824 Xtensa howto for handling simplify operations.
1825 bfd_perform_relocation / bfd_install_relocation use it to
1826 perform (install) the specified relocation. Since this replaces the code
1827 in bfd_perform_relocation, it is basically an Xtensa-specific,
1828 stripped-down version of bfd_perform_relocation. */
1830 static bfd_reloc_status_type
1831 bfd_elf_xtensa_reloc (bfd *abfd,
1832 arelent *reloc_entry,
1835 asection *input_section,
1837 char **error_message)
1840 bfd_reloc_status_type flag;
1841 bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1842 bfd_vma output_base = 0;
1843 reloc_howto_type *howto = reloc_entry->howto;
1844 asection *reloc_target_output_section;
1845 bfd_boolean is_weak_undef;
1847 if (!xtensa_default_isa)
1848 xtensa_default_isa = xtensa_isa_init (0, 0);
1850 /* ELF relocs are against symbols. If we are producing relocatable
1851 output, and the reloc is against an external symbol, the resulting
1852 reloc will also be against the same symbol. In such a case, we
1853 don't want to change anything about the way the reloc is handled,
1854 since it will all be done at final link time. This test is similar
1855 to what bfd_elf_generic_reloc does except that it lets relocs with
1856 howto->partial_inplace go through even if the addend is non-zero.
1857 (The real problem is that partial_inplace is set for XTENSA_32
1858 relocs to begin with, but that's a long story and there's little we
1859 can do about it now....) */
1861 if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0)
1863 reloc_entry->address += input_section->output_offset;
1864 return bfd_reloc_ok;
1867 /* Is the address of the relocation really within the section? */
1868 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1869 return bfd_reloc_outofrange;
1871 /* Work out which section the relocation is targeted at and the
1872 initial relocation command value. */
1874 /* Get symbol value. (Common symbols are special.) */
1875 if (bfd_is_com_section (symbol->section))
1878 relocation = symbol->value;
1880 reloc_target_output_section = symbol->section->output_section;
1882 /* Convert input-section-relative symbol value to absolute. */
1883 if ((output_bfd && !howto->partial_inplace)
1884 || reloc_target_output_section == NULL)
1887 output_base = reloc_target_output_section->vma;
1889 relocation += output_base + symbol->section->output_offset;
1891 /* Add in supplied addend. */
1892 relocation += reloc_entry->addend;
1894 /* Here the variable relocation holds the final address of the
1895 symbol we are relocating against, plus any addend. */
1898 if (!howto->partial_inplace)
1900 /* This is a partial relocation, and we want to apply the relocation
1901 to the reloc entry rather than the raw data. Everything except
1902 relocations against section symbols has already been handled
1905 BFD_ASSERT (symbol->flags & BSF_SECTION_SYM);
1906 reloc_entry->addend = relocation;
1907 reloc_entry->address += input_section->output_offset;
1908 return bfd_reloc_ok;
1912 reloc_entry->address += input_section->output_offset;
1913 reloc_entry->addend = 0;
1917 is_weak_undef = (bfd_is_und_section (symbol->section)
1918 && (symbol->flags & BSF_WEAK) != 0);
1919 flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation,
1920 (bfd_byte *) data, (bfd_vma) octets,
1921 is_weak_undef, error_message);
1923 if (flag == bfd_reloc_dangerous)
1925 /* Add the symbol name to the error message. */
1926 if (! *error_message)
1927 *error_message = "";
1928 *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)",
1929 strlen (symbol->name) + 17,
1931 (unsigned long) reloc_entry->addend);
1938 /* Set up an entry in the procedure linkage table. */
1941 elf_xtensa_create_plt_entry (bfd *dynobj,
1943 unsigned reloc_index)
1945 asection *splt, *sgotplt;
1946 bfd_vma plt_base, got_base;
1947 bfd_vma code_offset, lit_offset;
1950 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
1951 splt = elf_xtensa_get_plt_section (dynobj, chunk);
1952 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
1953 BFD_ASSERT (splt != NULL && sgotplt != NULL);
1955 plt_base = splt->output_section->vma + splt->output_offset;
1956 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1958 lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4;
1959 code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE;
1961 /* Fill in the literal entry. This is the offset of the dynamic
1962 relocation entry. */
1963 bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela),
1964 sgotplt->contents + lit_offset);
1966 /* Fill in the entry in the procedure linkage table. */
1967 memcpy (splt->contents + code_offset,
1968 (bfd_big_endian (output_bfd)
1969 ? elf_xtensa_be_plt_entry
1970 : elf_xtensa_le_plt_entry),
1972 bfd_put_16 (output_bfd, l32r_offset (got_base + 0,
1973 plt_base + code_offset + 3),
1974 splt->contents + code_offset + 4);
1975 bfd_put_16 (output_bfd, l32r_offset (got_base + 4,
1976 plt_base + code_offset + 6),
1977 splt->contents + code_offset + 7);
1978 bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset,
1979 plt_base + code_offset + 9),
1980 splt->contents + code_offset + 10);
1982 return plt_base + code_offset;
1986 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1987 both relocatable and final links. */
1990 elf_xtensa_relocate_section (bfd *output_bfd,
1991 struct bfd_link_info *info,
1993 asection *input_section,
1995 Elf_Internal_Rela *relocs,
1996 Elf_Internal_Sym *local_syms,
1997 asection **local_sections)
1999 Elf_Internal_Shdr *symtab_hdr;
2000 Elf_Internal_Rela *rel;
2001 Elf_Internal_Rela *relend;
2002 struct elf_link_hash_entry **sym_hashes;
2003 asection *srelgot, *srelplt;
2005 property_table_entry *lit_table = 0;
2007 char *error_message = NULL;
2008 bfd_size_type input_size;
2010 if (!xtensa_default_isa)
2011 xtensa_default_isa = xtensa_isa_init (0, 0);
2013 dynobj = elf_hash_table (info)->dynobj;
2014 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2015 sym_hashes = elf_sym_hashes (input_bfd);
2021 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2022 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2025 if (elf_hash_table (info)->dynamic_sections_created)
2027 ltblsize = xtensa_read_table_entries (input_bfd, input_section,
2028 &lit_table, XTENSA_LIT_SEC_NAME,
2034 input_size = bfd_get_section_limit (input_bfd, input_section);
2037 relend = relocs + input_section->reloc_count;
2038 for (; rel < relend; rel++)
2041 reloc_howto_type *howto;
2042 unsigned long r_symndx;
2043 struct elf_link_hash_entry *h;
2044 Elf_Internal_Sym *sym;
2047 bfd_reloc_status_type r;
2048 bfd_boolean is_weak_undef;
2049 bfd_boolean unresolved_reloc;
2052 r_type = ELF32_R_TYPE (rel->r_info);
2053 if (r_type == (int) R_XTENSA_GNU_VTINHERIT
2054 || r_type == (int) R_XTENSA_GNU_VTENTRY)
2057 if (r_type < 0 || r_type >= (int) R_XTENSA_max)
2059 bfd_set_error (bfd_error_bad_value);
2062 howto = &elf_howto_table[r_type];
2064 r_symndx = ELF32_R_SYM (rel->r_info);
2066 if (info->relocatable)
2068 /* This is a relocatable link.
2069 1) If the reloc is against a section symbol, adjust
2070 according to the output section.
2071 2) If there is a new target for this relocation,
2072 the new target will be in the same output section.
2073 We adjust the relocation by the output section
2076 if (relaxing_section)
2078 /* Check if this references a section in another input file. */
2079 if (!do_fix_for_relocatable_link (rel, input_bfd, input_section,
2082 r_type = ELF32_R_TYPE (rel->r_info);
2085 if (r_type == R_XTENSA_ASM_SIMPLIFY)
2087 char *error_message = NULL;
2088 /* Convert ASM_SIMPLIFY into the simpler relocation
2089 so that they never escape a relaxing link. */
2090 r = contract_asm_expansion (contents, input_size, rel,
2092 if (r != bfd_reloc_ok)
2094 if (!((*info->callbacks->reloc_dangerous)
2095 (info, error_message, input_bfd, input_section,
2099 r_type = ELF32_R_TYPE (rel->r_info);
2102 /* This is a relocatable link, so we don't have to change
2103 anything unless the reloc is against a section symbol,
2104 in which case we have to adjust according to where the
2105 section symbol winds up in the output section. */
2106 if (r_symndx < symtab_hdr->sh_info)
2108 sym = local_syms + r_symndx;
2109 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2111 sec = local_sections[r_symndx];
2112 rel->r_addend += sec->output_offset + sym->st_value;
2116 /* If there is an addend with a partial_inplace howto,
2117 then move the addend to the contents. This is a hack
2118 to work around problems with DWARF in relocatable links
2119 with some previous version of BFD. Now we can't easily get
2120 rid of the hack without breaking backward compatibility.... */
2123 howto = &elf_howto_table[r_type];
2124 if (howto->partial_inplace)
2126 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2127 rel->r_addend, contents,
2128 rel->r_offset, FALSE,
2130 if (r != bfd_reloc_ok)
2132 if (!((*info->callbacks->reloc_dangerous)
2133 (info, error_message, input_bfd, input_section,
2141 /* Done with work for relocatable link; continue with next reloc. */
2145 /* This is a final link. */
2150 is_weak_undef = FALSE;
2151 unresolved_reloc = FALSE;
2154 if (howto->partial_inplace)
2156 /* Because R_XTENSA_32 was made partial_inplace to fix some
2157 problems with DWARF info in partial links, there may be
2158 an addend stored in the contents. Take it out of there
2159 and move it back into the addend field of the reloc. */
2160 rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset);
2161 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2164 if (r_symndx < symtab_hdr->sh_info)
2166 sym = local_syms + r_symndx;
2167 sec = local_sections[r_symndx];
2168 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2172 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2173 r_symndx, symtab_hdr, sym_hashes,
2175 unresolved_reloc, warned);
2178 && !unresolved_reloc
2179 && h->root.type == bfd_link_hash_undefweak)
2180 is_weak_undef = TRUE;
2183 if (relaxing_section)
2185 /* Check if this references a section in another input file. */
2186 do_fix_for_final_link (rel, input_bfd, input_section, contents,
2189 /* Update some already cached values. */
2190 r_type = ELF32_R_TYPE (rel->r_info);
2191 howto = &elf_howto_table[r_type];
2194 /* Sanity check the address. */
2195 if (rel->r_offset >= input_size
2196 && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE)
2198 (*_bfd_error_handler)
2199 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2200 input_bfd, input_section, rel->r_offset, input_size);
2201 bfd_set_error (bfd_error_bad_value);
2205 /* Generate dynamic relocations. */
2206 if (elf_hash_table (info)->dynamic_sections_created)
2208 bfd_boolean dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
2210 if (dynamic_symbol && is_operand_relocation (r_type))
2212 /* This is an error. The symbol's real value won't be known
2213 until runtime and it's likely to be out of range anyway. */
2214 const char *name = h->root.root.string;
2215 error_message = vsprint_msg ("invalid relocation for dynamic "
2217 strlen (name) + 2, name);
2218 if (!((*info->callbacks->reloc_dangerous)
2219 (info, error_message, input_bfd, input_section,
2223 else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
2224 && (input_section->flags & SEC_ALLOC) != 0
2225 && (dynamic_symbol || info->shared))
2227 Elf_Internal_Rela outrel;
2231 if (dynamic_symbol && r_type == R_XTENSA_PLT)
2236 BFD_ASSERT (srel != NULL);
2239 _bfd_elf_section_offset (output_bfd, info,
2240 input_section, rel->r_offset);
2242 if ((outrel.r_offset | 1) == (bfd_vma) -1)
2243 memset (&outrel, 0, sizeof outrel);
2246 outrel.r_offset += (input_section->output_section->vma
2247 + input_section->output_offset);
2249 /* Complain if the relocation is in a read-only section
2250 and not in a literal pool. */
2251 if ((input_section->flags & SEC_READONLY) != 0
2252 && !elf_xtensa_in_literal_pool (lit_table, ltblsize,
2256 _("dynamic relocation in read-only section");
2257 if (!((*info->callbacks->reloc_dangerous)
2258 (info, error_message, input_bfd, input_section,
2265 outrel.r_addend = rel->r_addend;
2268 if (r_type == R_XTENSA_32)
2271 ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT);
2274 else /* r_type == R_XTENSA_PLT */
2277 ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT);
2279 /* Create the PLT entry and set the initial
2280 contents of the literal entry to the address of
2283 elf_xtensa_create_plt_entry (dynobj, output_bfd,
2286 unresolved_reloc = FALSE;
2290 /* Generate a RELATIVE relocation. */
2291 outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE);
2292 outrel.r_addend = 0;
2296 loc = (srel->contents
2297 + srel->reloc_count++ * sizeof (Elf32_External_Rela));
2298 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2299 BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count
2304 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2305 because such sections are not SEC_ALLOC and thus ld.so will
2306 not process them. */
2307 if (unresolved_reloc
2308 && !((input_section->flags & SEC_DEBUGGING) != 0
2310 (*_bfd_error_handler)
2311 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2314 (long) rel->r_offset,
2315 h->root.root.string);
2317 /* There's no point in calling bfd_perform_relocation here.
2318 Just go directly to our "special function". */
2319 r = elf_xtensa_do_reloc (howto, input_bfd, input_section,
2320 relocation + rel->r_addend,
2321 contents, rel->r_offset, is_weak_undef,
2324 if (r != bfd_reloc_ok && !warned)
2328 BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other);
2329 BFD_ASSERT (error_message != NULL);
2332 name = h->root.root.string;
2335 name = bfd_elf_string_from_elf_section
2336 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2337 if (name && *name == '\0')
2338 name = bfd_section_name (input_bfd, sec);
2342 if (rel->r_addend == 0)
2343 error_message = vsprint_msg (error_message, ": %s",
2344 strlen (name) + 2, name);
2346 error_message = vsprint_msg (error_message, ": (%s+0x%x)",
2348 name, (int)rel->r_addend);
2351 if (!((*info->callbacks->reloc_dangerous)
2352 (info, error_message, input_bfd, input_section,
2361 input_section->reloc_done = TRUE;
2367 /* Finish up dynamic symbol handling. There's not much to do here since
2368 the PLT and GOT entries are all set up by relocate_section. */
2371 elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
2372 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2373 struct elf_link_hash_entry *h,
2374 Elf_Internal_Sym *sym)
2379 /* Mark the symbol as undefined, rather than as defined in
2380 the .plt section. Leave the value alone. */
2381 sym->st_shndx = SHN_UNDEF;
2384 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2385 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2386 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2387 sym->st_shndx = SHN_ABS;
2393 /* Combine adjacent literal table entries in the output. Adjacent
2394 entries within each input section may have been removed during
2395 relaxation, but we repeat the process here, even though it's too late
2396 to shrink the output section, because it's important to minimize the
2397 number of literal table entries to reduce the start-up work for the
2398 runtime linker. Returns the number of remaining table entries or -1
2402 elf_xtensa_combine_prop_entries (bfd *output_bfd,
2407 property_table_entry *table;
2408 bfd_size_type section_size, sgotloc_size;
2412 section_size = sxtlit->size;
2413 BFD_ASSERT (section_size % 8 == 0);
2414 num = section_size / 8;
2416 sgotloc_size = sgotloc->size;
2417 if (sgotloc_size != section_size)
2419 (*_bfd_error_handler)
2420 (_("internal inconsistency in size of .got.loc section"));
2424 table = bfd_malloc (num * sizeof (property_table_entry));
2428 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2429 propagates to the output section, where it doesn't really apply and
2430 where it breaks the following call to bfd_malloc_and_get_section. */
2431 sxtlit->flags &= ~SEC_IN_MEMORY;
2433 if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents))
2441 /* There should never be any relocations left at this point, so this
2442 is quite a bit easier than what is done during relaxation. */
2444 /* Copy the raw contents into a property table array and sort it. */
2446 for (n = 0; n < num; n++)
2448 table[n].address = bfd_get_32 (output_bfd, &contents[offset]);
2449 table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]);
2452 qsort (table, num, sizeof (property_table_entry), property_table_compare);
2454 for (n = 0; n < num; n++)
2456 bfd_boolean remove = FALSE;
2458 if (table[n].size == 0)
2461 (table[n-1].address + table[n-1].size == table[n].address))
2463 table[n-1].size += table[n].size;
2469 for (m = n; m < num - 1; m++)
2471 table[m].address = table[m+1].address;
2472 table[m].size = table[m+1].size;
2480 /* Copy the data back to the raw contents. */
2482 for (n = 0; n < num; n++)
2484 bfd_put_32 (output_bfd, table[n].address, &contents[offset]);
2485 bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]);
2489 /* Clear the removed bytes. */
2490 if ((bfd_size_type) (num * 8) < section_size)
2491 memset (&contents[num * 8], 0, section_size - num * 8);
2493 if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0,
2497 /* Copy the contents to ".got.loc". */
2498 memcpy (sgotloc->contents, contents, section_size);
2506 /* Finish up the dynamic sections. */
2509 elf_xtensa_finish_dynamic_sections (bfd *output_bfd,
2510 struct bfd_link_info *info)
2513 asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc;
2514 Elf32_External_Dyn *dyncon, *dynconend;
2515 int num_xtlit_entries;
2517 if (! elf_hash_table (info)->dynamic_sections_created)
2520 dynobj = elf_hash_table (info)->dynobj;
2521 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2522 BFD_ASSERT (sdyn != NULL);
2524 /* Set the first entry in the global offset table to the address of
2525 the dynamic section. */
2526 sgot = bfd_get_section_by_name (dynobj, ".got");
2529 BFD_ASSERT (sgot->size == 4);
2531 bfd_put_32 (output_bfd, 0, sgot->contents);
2533 bfd_put_32 (output_bfd,
2534 sdyn->output_section->vma + sdyn->output_offset,
2538 srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2539 if (srelplt && srelplt->size != 0)
2541 asection *sgotplt, *srelgot, *spltlittbl;
2542 int chunk, plt_chunks, plt_entries;
2543 Elf_Internal_Rela irela;
2545 unsigned rtld_reloc;
2547 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");;
2548 BFD_ASSERT (srelgot != NULL);
2550 spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt");
2551 BFD_ASSERT (spltlittbl != NULL);
2553 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2554 of them follow immediately after.... */
2555 for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++)
2557 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2558 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2559 if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD)
2562 BFD_ASSERT (rtld_reloc < srelgot->reloc_count);
2564 plt_entries = srelplt->size / sizeof (Elf32_External_Rela);
2566 (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK;
2568 for (chunk = 0; chunk < plt_chunks; chunk++)
2570 int chunk_entries = 0;
2572 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
2573 BFD_ASSERT (sgotplt != NULL);
2575 /* Emit special RTLD relocations for the first two entries in
2576 each chunk of the .got.plt section. */
2578 loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela);
2579 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2580 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2581 irela.r_offset = (sgotplt->output_section->vma
2582 + sgotplt->output_offset);
2583 irela.r_addend = 1; /* tell rtld to set value to resolver function */
2584 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2586 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2588 /* Next literal immediately follows the first. */
2589 loc += sizeof (Elf32_External_Rela);
2590 bfd_elf32_swap_reloca_in (output_bfd, loc, &irela);
2591 BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD);
2592 irela.r_offset = (sgotplt->output_section->vma
2593 + sgotplt->output_offset + 4);
2594 /* Tell rtld to set value to object's link map. */
2596 bfd_elf32_swap_reloca_out (output_bfd, &irela, loc);
2598 BFD_ASSERT (rtld_reloc <= srelgot->reloc_count);
2600 /* Fill in the literal table. */
2601 if (chunk < plt_chunks - 1)
2602 chunk_entries = PLT_ENTRIES_PER_CHUNK;
2604 chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK);
2606 BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size);
2607 bfd_put_32 (output_bfd,
2608 sgotplt->output_section->vma + sgotplt->output_offset,
2609 spltlittbl->contents + (chunk * 8) + 0);
2610 bfd_put_32 (output_bfd,
2611 8 + (chunk_entries * 4),
2612 spltlittbl->contents + (chunk * 8) + 4);
2615 /* All the dynamic relocations have been emitted at this point.
2616 Make sure the relocation sections are the correct size. */
2617 if (srelgot->size != (sizeof (Elf32_External_Rela)
2618 * srelgot->reloc_count)
2619 || srelplt->size != (sizeof (Elf32_External_Rela)
2620 * srelplt->reloc_count))
2623 /* The .xt.lit.plt section has just been modified. This must
2624 happen before the code below which combines adjacent literal
2625 table entries, and the .xt.lit.plt contents have to be forced to
2627 if (! bfd_set_section_contents (output_bfd,
2628 spltlittbl->output_section,
2629 spltlittbl->contents,
2630 spltlittbl->output_offset,
2633 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2634 spltlittbl->flags &= ~SEC_HAS_CONTENTS;
2637 /* Combine adjacent literal table entries. */
2638 BFD_ASSERT (! info->relocatable);
2639 sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit");
2640 sgotloc = bfd_get_section_by_name (dynobj, ".got.loc");
2641 BFD_ASSERT (sxtlit && sgotloc);
2643 elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc);
2644 if (num_xtlit_entries < 0)
2647 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2648 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2649 for (; dyncon < dynconend; dyncon++)
2651 Elf_Internal_Dyn dyn;
2655 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2662 case DT_XTENSA_GOT_LOC_SZ:
2663 dyn.d_un.d_val = num_xtlit_entries;
2666 case DT_XTENSA_GOT_LOC_OFF:
2675 s = bfd_get_section_by_name (output_bfd, name);
2677 dyn.d_un.d_ptr = s->vma;
2681 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2683 dyn.d_un.d_val = s->size;
2687 /* Adjust RELASZ to not include JMPREL. This matches what
2688 glibc expects and what is done for several other ELF
2689 targets (e.g., i386, alpha), but the "correct" behavior
2690 seems to be unresolved. Since the linker script arranges
2691 for .rela.plt to follow all other relocation sections, we
2692 don't have to worry about changing the DT_RELA entry. */
2693 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2695 dyn.d_un.d_val -= s->size;
2699 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2706 /* Functions for dealing with the e_flags field. */
2708 /* Merge backend specific data from an object file to the output
2709 object file when linking. */
2712 elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2714 unsigned out_mach, in_mach;
2715 flagword out_flag, in_flag;
2717 /* Check if we have the same endianess. */
2718 if (!_bfd_generic_verify_endian_match (ibfd, obfd))
2721 /* Don't even pretend to support mixed-format linking. */
2722 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2723 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2726 out_flag = elf_elfheader (obfd)->e_flags;
2727 in_flag = elf_elfheader (ibfd)->e_flags;
2729 out_mach = out_flag & EF_XTENSA_MACH;
2730 in_mach = in_flag & EF_XTENSA_MACH;
2731 if (out_mach != in_mach)
2733 (*_bfd_error_handler)
2734 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2735 ibfd, out_mach, in_mach);
2736 bfd_set_error (bfd_error_wrong_format);
2740 if (! elf_flags_init (obfd))
2742 elf_flags_init (obfd) = TRUE;
2743 elf_elfheader (obfd)->e_flags = in_flag;
2745 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
2746 && bfd_get_arch_info (obfd)->the_default)
2747 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
2748 bfd_get_mach (ibfd));
2753 if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN))
2754 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN);
2756 if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT))
2757 elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT);
2764 elf_xtensa_set_private_flags (bfd *abfd, flagword flags)
2766 BFD_ASSERT (!elf_flags_init (abfd)
2767 || elf_elfheader (abfd)->e_flags == flags);
2769 elf_elfheader (abfd)->e_flags |= flags;
2770 elf_flags_init (abfd) = TRUE;
2777 elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg)
2779 FILE *f = (FILE *) farg;
2780 flagword e_flags = elf_elfheader (abfd)->e_flags;
2782 fprintf (f, "\nXtensa header:\n");
2783 if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH)
2784 fprintf (f, "\nMachine = Base\n");
2786 fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH);
2788 fprintf (f, "Insn tables = %s\n",
2789 (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false");
2791 fprintf (f, "Literal tables = %s\n",
2792 (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false");
2794 return _bfd_elf_print_private_bfd_data (abfd, farg);
2798 /* Set the right machine number for an Xtensa ELF file. */
2801 elf_xtensa_object_p (bfd *abfd)
2804 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH;
2809 mach = bfd_mach_xtensa;
2815 (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach);
2820 /* The final processing done just before writing out an Xtensa ELF object
2821 file. This gets the Xtensa architecture right based on the machine
2825 elf_xtensa_final_write_processing (bfd *abfd,
2826 bfd_boolean linker ATTRIBUTE_UNUSED)
2831 switch (mach = bfd_get_mach (abfd))
2833 case bfd_mach_xtensa:
2834 val = E_XTENSA_MACH;
2840 elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH);
2841 elf_elfheader (abfd)->e_flags |= val;
2845 static enum elf_reloc_type_class
2846 elf_xtensa_reloc_type_class (const Elf_Internal_Rela *rela)
2848 switch ((int) ELF32_R_TYPE (rela->r_info))
2850 case R_XTENSA_RELATIVE:
2851 return reloc_class_relative;
2852 case R_XTENSA_JMP_SLOT:
2853 return reloc_class_plt;
2855 return reloc_class_normal;
2861 elf_xtensa_discard_info_for_section (bfd *abfd,
2862 struct elf_reloc_cookie *cookie,
2863 struct bfd_link_info *info,
2867 bfd_vma section_size;
2868 bfd_vma offset, actual_offset;
2869 size_t removed_bytes = 0;
2871 section_size = sec->size;
2872 if (section_size == 0 || section_size % 8 != 0)
2875 if (sec->output_section
2876 && bfd_is_abs_section (sec->output_section))
2879 contents = retrieve_contents (abfd, sec, info->keep_memory);
2883 cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory);
2886 release_contents (sec, contents);
2890 cookie->rel = cookie->rels;
2891 cookie->relend = cookie->rels + sec->reloc_count;
2893 for (offset = 0; offset < section_size; offset += 8)
2895 actual_offset = offset - removed_bytes;
2897 /* The ...symbol_deleted_p function will skip over relocs but it
2898 won't adjust their offsets, so do that here. */
2899 while (cookie->rel < cookie->relend
2900 && cookie->rel->r_offset < offset)
2902 cookie->rel->r_offset -= removed_bytes;
2906 while (cookie->rel < cookie->relend
2907 && cookie->rel->r_offset == offset)
2909 if (bfd_elf_reloc_symbol_deleted_p (offset, cookie))
2911 /* Remove the table entry. (If the reloc type is NONE, then
2912 the entry has already been merged with another and deleted
2913 during relaxation.) */
2914 if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE)
2916 /* Shift the contents up. */
2917 if (offset + 8 < section_size)
2918 memmove (&contents[actual_offset],
2919 &contents[actual_offset+8],
2920 section_size - offset - 8);
2924 /* Remove this relocation. */
2925 cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
2928 /* Adjust the relocation offset for previous removals. This
2929 should not be done before calling ...symbol_deleted_p
2930 because it might mess up the offset comparisons there.
2931 Make sure the offset doesn't underflow in the case where
2932 the first entry is removed. */
2933 if (cookie->rel->r_offset >= removed_bytes)
2934 cookie->rel->r_offset -= removed_bytes;
2936 cookie->rel->r_offset = 0;
2942 if (removed_bytes != 0)
2944 /* Adjust any remaining relocs (shouldn't be any). */
2945 for (; cookie->rel < cookie->relend; cookie->rel++)
2947 if (cookie->rel->r_offset >= removed_bytes)
2948 cookie->rel->r_offset -= removed_bytes;
2950 cookie->rel->r_offset = 0;
2953 /* Clear the removed bytes. */
2954 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
2956 pin_contents (sec, contents);
2957 pin_internal_relocs (sec, cookie->rels);
2960 sec->size = section_size - removed_bytes;
2962 if (xtensa_is_littable_section (sec))
2964 bfd *dynobj = elf_hash_table (info)->dynobj;
2968 bfd_get_section_by_name (dynobj, ".got.loc");
2970 sgotloc->size -= removed_bytes;
2976 release_contents (sec, contents);
2977 release_internal_relocs (sec, cookie->rels);
2980 return (removed_bytes != 0);
2985 elf_xtensa_discard_info (bfd *abfd,
2986 struct elf_reloc_cookie *cookie,
2987 struct bfd_link_info *info)
2990 bfd_boolean changed = FALSE;
2992 for (sec = abfd->sections; sec != NULL; sec = sec->next)
2994 if (xtensa_is_property_section (sec))
2996 if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec))
3006 elf_xtensa_ignore_discarded_relocs (asection *sec)
3008 return xtensa_is_property_section (sec);
3012 /* Support for core dump NOTE sections. */
3015 elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3020 /* The size for Xtensa is variable, so don't try to recognize the format
3021 based on the size. Just assume this is GNU/Linux. */
3024 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3027 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3031 size = note->descsz - offset - 4;
3033 /* Make a ".reg/999" section. */
3034 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3035 size, note->descpos + offset);
3040 elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3042 switch (note->descsz)
3047 case 128: /* GNU/Linux elf_prpsinfo */
3048 elf_tdata (abfd)->core_program
3049 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3050 elf_tdata (abfd)->core_command
3051 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3054 /* Note that for some reason, a spurious space is tacked
3055 onto the end of the args in some (at least one anyway)
3056 implementations, so strip it off if it exists. */
3059 char *command = elf_tdata (abfd)->core_command;
3060 int n = strlen (command);
3062 if (0 < n && command[n - 1] == ' ')
3063 command[n - 1] = '\0';
3070 /* Generic Xtensa configurability stuff. */
3072 static xtensa_opcode callx0_op = XTENSA_UNDEFINED;
3073 static xtensa_opcode callx4_op = XTENSA_UNDEFINED;
3074 static xtensa_opcode callx8_op = XTENSA_UNDEFINED;
3075 static xtensa_opcode callx12_op = XTENSA_UNDEFINED;
3076 static xtensa_opcode call0_op = XTENSA_UNDEFINED;
3077 static xtensa_opcode call4_op = XTENSA_UNDEFINED;
3078 static xtensa_opcode call8_op = XTENSA_UNDEFINED;
3079 static xtensa_opcode call12_op = XTENSA_UNDEFINED;
3082 init_call_opcodes (void)
3084 if (callx0_op == XTENSA_UNDEFINED)
3086 callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0");
3087 callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4");
3088 callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8");
3089 callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12");
3090 call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0");
3091 call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4");
3092 call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8");
3093 call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12");
3099 is_indirect_call_opcode (xtensa_opcode opcode)
3101 init_call_opcodes ();
3102 return (opcode == callx0_op
3103 || opcode == callx4_op
3104 || opcode == callx8_op
3105 || opcode == callx12_op);
3110 is_direct_call_opcode (xtensa_opcode opcode)
3112 init_call_opcodes ();
3113 return (opcode == call0_op
3114 || opcode == call4_op
3115 || opcode == call8_op
3116 || opcode == call12_op);
3121 is_windowed_call_opcode (xtensa_opcode opcode)
3123 init_call_opcodes ();
3124 return (opcode == call4_op
3125 || opcode == call8_op
3126 || opcode == call12_op
3127 || opcode == callx4_op
3128 || opcode == callx8_op
3129 || opcode == callx12_op);
3133 static xtensa_opcode
3134 get_const16_opcode (void)
3136 static bfd_boolean done_lookup = FALSE;
3137 static xtensa_opcode const16_opcode = XTENSA_UNDEFINED;
3140 const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16");
3143 return const16_opcode;
3147 static xtensa_opcode
3148 get_l32r_opcode (void)
3150 static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED;
3151 static bfd_boolean done_lookup = FALSE;
3155 l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r");
3163 l32r_offset (bfd_vma addr, bfd_vma pc)
3167 offset = addr - ((pc+3) & -4);
3168 BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0);
3169 offset = (signed int) offset >> 2;
3170 BFD_ASSERT ((signed int) offset >> 16 == -1);
3176 get_relocation_opnd (xtensa_opcode opcode, int r_type)
3178 xtensa_isa isa = xtensa_default_isa;
3179 int last_immed, last_opnd, opi;
3181 if (opcode == XTENSA_UNDEFINED)
3182 return XTENSA_UNDEFINED;
3184 /* Find the last visible PC-relative immediate operand for the opcode.
3185 If there are no PC-relative immediates, then choose the last visible
3186 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3187 last_immed = XTENSA_UNDEFINED;
3188 last_opnd = xtensa_opcode_num_operands (isa, opcode);
3189 for (opi = last_opnd - 1; opi >= 0; opi--)
3191 if (xtensa_operand_is_visible (isa, opcode, opi) == 0)
3193 if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1)
3198 if (last_immed == XTENSA_UNDEFINED
3199 && xtensa_operand_is_register (isa, opcode, opi) == 0)
3203 return XTENSA_UNDEFINED;
3205 /* If the operand number was specified in an old-style relocation,
3206 check for consistency with the operand computed above. */
3207 if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2)
3209 int reloc_opnd = r_type - R_XTENSA_OP0;
3210 if (reloc_opnd != last_immed)
3211 return XTENSA_UNDEFINED;
3219 get_relocation_slot (int r_type)
3229 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3230 return r_type - R_XTENSA_SLOT0_OP;
3231 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3232 return r_type - R_XTENSA_SLOT0_ALT;
3236 return XTENSA_UNDEFINED;
3240 /* Get the opcode for a relocation. */
3242 static xtensa_opcode
3243 get_relocation_opcode (bfd *abfd,
3246 Elf_Internal_Rela *irel)
3248 static xtensa_insnbuf ibuff = NULL;
3249 static xtensa_insnbuf sbuff = NULL;
3250 xtensa_isa isa = xtensa_default_isa;
3254 if (contents == NULL)
3255 return XTENSA_UNDEFINED;
3257 if (bfd_get_section_limit (abfd, sec) <= irel->r_offset)
3258 return XTENSA_UNDEFINED;
3262 ibuff = xtensa_insnbuf_alloc (isa);
3263 sbuff = xtensa_insnbuf_alloc (isa);
3266 /* Decode the instruction. */
3267 xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset],
3268 sec->size - irel->r_offset);
3269 fmt = xtensa_format_decode (isa, ibuff);
3270 slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info));
3271 if (slot == XTENSA_UNDEFINED)
3272 return XTENSA_UNDEFINED;
3273 xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff);
3274 return xtensa_opcode_decode (isa, fmt, slot, sbuff);
3279 is_l32r_relocation (bfd *abfd,
3282 Elf_Internal_Rela *irel)
3284 xtensa_opcode opcode;
3285 if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
3287 opcode = get_relocation_opcode (abfd, sec, contents, irel);
3288 return (opcode == get_l32r_opcode ());
3292 static bfd_size_type
3293 get_asm_simplify_size (bfd_byte *contents,
3294 bfd_size_type content_len,
3295 bfd_size_type offset)
3297 bfd_size_type insnlen, size = 0;
3299 /* Decode the size of the next two instructions. */
3300 insnlen = insn_decode_len (contents, content_len, offset);
3306 insnlen = insn_decode_len (contents, content_len, offset + size);
3316 is_alt_relocation (int r_type)
3318 return (r_type >= R_XTENSA_SLOT0_ALT
3319 && r_type <= R_XTENSA_SLOT14_ALT);
3324 is_operand_relocation (int r_type)
3334 if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP)
3336 if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT)
3345 #define MIN_INSN_LENGTH 2
3347 /* Return 0 if it fails to decode. */
3350 insn_decode_len (bfd_byte *contents,
3351 bfd_size_type content_len,
3352 bfd_size_type offset)
3355 xtensa_isa isa = xtensa_default_isa;
3357 static xtensa_insnbuf ibuff = NULL;
3359 if (offset + MIN_INSN_LENGTH > content_len)
3363 ibuff = xtensa_insnbuf_alloc (isa);
3364 xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset],
3365 content_len - offset);
3366 fmt = xtensa_format_decode (isa, ibuff);
3367 if (fmt == XTENSA_UNDEFINED)
3369 insn_len = xtensa_format_length (isa, fmt);
3370 if (insn_len == XTENSA_UNDEFINED)
3376 /* Decode the opcode for a single slot instruction.
3377 Return 0 if it fails to decode or the instruction is multi-slot. */
3380 insn_decode_opcode (bfd_byte *contents,
3381 bfd_size_type content_len,
3382 bfd_size_type offset,
3385 xtensa_isa isa = xtensa_default_isa;
3387 static xtensa_insnbuf insnbuf = NULL;
3388 static xtensa_insnbuf slotbuf = NULL;
3390 if (offset + MIN_INSN_LENGTH > content_len)
3391 return XTENSA_UNDEFINED;
3393 if (insnbuf == NULL)
3395 insnbuf = xtensa_insnbuf_alloc (isa);
3396 slotbuf = xtensa_insnbuf_alloc (isa);
3399 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3400 content_len - offset);
3401 fmt = xtensa_format_decode (isa, insnbuf);
3402 if (fmt == XTENSA_UNDEFINED)
3403 return XTENSA_UNDEFINED;
3405 if (slot >= xtensa_format_num_slots (isa, fmt))
3406 return XTENSA_UNDEFINED;
3408 xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf);
3409 return xtensa_opcode_decode (isa, fmt, slot, slotbuf);
3413 /* The offset is the offset in the contents.
3414 The address is the address of that offset. */
3417 check_branch_target_aligned (bfd_byte *contents,
3418 bfd_size_type content_length,
3422 bfd_size_type insn_len = insn_decode_len (contents, content_length, offset);
3425 return check_branch_target_aligned_address (address, insn_len);
3430 check_loop_aligned (bfd_byte *contents,
3431 bfd_size_type content_length,
3435 bfd_size_type loop_len, insn_len;
3436 xtensa_opcode opcode =
3437 insn_decode_opcode (contents, content_length, offset, 0);
3438 BFD_ASSERT (opcode != XTENSA_UNDEFINED);
3439 if (opcode != XTENSA_UNDEFINED)
3441 BFD_ASSERT (xtensa_opcode_is_loop (xtensa_default_isa, opcode));
3442 if (!xtensa_opcode_is_loop (xtensa_default_isa, opcode))
3445 loop_len = insn_decode_len (contents, content_length, offset);
3446 BFD_ASSERT (loop_len != 0);
3450 insn_len = insn_decode_len (contents, content_length, offset + loop_len);
3451 BFD_ASSERT (insn_len != 0);
3455 return check_branch_target_aligned_address (address + loop_len, insn_len);
3460 check_branch_target_aligned_address (bfd_vma addr, int len)
3463 return (addr % 8 == 0);
3464 return ((addr >> 2) == ((addr + len - 1) >> 2));
3468 /* Instruction widening and narrowing. */
3470 /* When FLIX is available we need to access certain instructions only
3471 when they are 16-bit or 24-bit instructions. This table caches
3472 information about such instructions by walking through all the
3473 opcodes and finding the smallest single-slot format into which each
3476 static xtensa_format *op_single_fmt_table = NULL;
3480 init_op_single_format_table (void)
3482 xtensa_isa isa = xtensa_default_isa;
3483 xtensa_insnbuf ibuf;
3484 xtensa_opcode opcode;
3488 if (op_single_fmt_table)
3491 ibuf = xtensa_insnbuf_alloc (isa);
3492 num_opcodes = xtensa_isa_num_opcodes (isa);
3494 op_single_fmt_table = (xtensa_format *)
3495 bfd_malloc (sizeof (xtensa_format) * num_opcodes);
3496 for (opcode = 0; opcode < num_opcodes; opcode++)
3498 op_single_fmt_table[opcode] = XTENSA_UNDEFINED;
3499 for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++)
3501 if (xtensa_format_num_slots (isa, fmt) == 1
3502 && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0)
3504 xtensa_opcode old_fmt = op_single_fmt_table[opcode];
3505 int fmt_length = xtensa_format_length (isa, fmt);
3506 if (old_fmt == XTENSA_UNDEFINED
3507 || fmt_length < xtensa_format_length (isa, old_fmt))
3508 op_single_fmt_table[opcode] = fmt;
3512 xtensa_insnbuf_free (isa, ibuf);
3516 static xtensa_format
3517 get_single_format (xtensa_opcode opcode)
3519 init_op_single_format_table ();
3520 return op_single_fmt_table[opcode];
3524 /* For the set of narrowable instructions we do NOT include the
3525 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3526 involved during linker relaxation that may require these to
3527 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3528 requires special case code to ensure it only works when op1 == op2. */
3536 struct string_pair narrowable[] =
3539 { "addi", "addi.n" },
3540 { "addmi", "addi.n" },
3541 { "l32i", "l32i.n" },
3542 { "movi", "movi.n" },
3544 { "retw", "retw.n" },
3545 { "s32i", "s32i.n" },
3546 { "or", "mov.n" } /* special case only when op1 == op2 */
3549 struct string_pair widenable[] =
3552 { "addi", "addi.n" },
3553 { "addmi", "addi.n" },
3554 { "beqz", "beqz.n" },
3555 { "bnez", "bnez.n" },
3556 { "l32i", "l32i.n" },
3557 { "movi", "movi.n" },
3559 { "retw", "retw.n" },
3560 { "s32i", "s32i.n" },
3561 { "or", "mov.n" } /* special case only when op1 == op2 */
3565 /* Attempt to narrow an instruction. Return true if the narrowing is
3566 valid. If the do_it parameter is non-zero, then perform the action
3567 in-place directly into the contents. Otherwise, do not modify the
3568 contents. The set of valid narrowing are specified by a string table
3569 but require some special case operand checks in some cases. */
3572 narrow_instruction (bfd_byte *contents,
3573 bfd_size_type content_length,
3574 bfd_size_type offset,
3577 xtensa_opcode opcode;
3578 bfd_size_type insn_len, opi;
3579 xtensa_isa isa = xtensa_default_isa;
3580 xtensa_format fmt, o_fmt;
3582 static xtensa_insnbuf insnbuf = NULL;
3583 static xtensa_insnbuf slotbuf = NULL;
3584 static xtensa_insnbuf o_insnbuf = NULL;
3585 static xtensa_insnbuf o_slotbuf = NULL;
3587 if (insnbuf == NULL)
3589 insnbuf = xtensa_insnbuf_alloc (isa);
3590 slotbuf = xtensa_insnbuf_alloc (isa);
3591 o_insnbuf = xtensa_insnbuf_alloc (isa);
3592 o_slotbuf = xtensa_insnbuf_alloc (isa);
3595 BFD_ASSERT (offset < content_length);
3597 if (content_length < 2)
3600 /* We will hand-code a few of these for a little while.
3601 These have all been specified in the assembler aleady. */
3602 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3603 content_length - offset);
3604 fmt = xtensa_format_decode (isa, insnbuf);
3605 if (xtensa_format_num_slots (isa, fmt) != 1)
3608 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3611 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3612 if (opcode == XTENSA_UNDEFINED)
3614 insn_len = xtensa_format_length (isa, fmt);
3615 if (insn_len > content_length)
3618 for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); ++opi)
3620 bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0);
3622 if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide))
3624 uint32 value, newval;
3625 int i, operand_count, o_operand_count;
3626 xtensa_opcode o_opcode;
3628 /* Address does not matter in this case. We might need to
3629 fix it to handle branches/jumps. */
3630 bfd_vma self_address = 0;
3632 o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow);
3633 if (o_opcode == XTENSA_UNDEFINED)
3635 o_fmt = get_single_format (o_opcode);
3636 if (o_fmt == XTENSA_UNDEFINED)
3639 if (xtensa_format_length (isa, fmt) != 3
3640 || xtensa_format_length (isa, o_fmt) != 2)
3643 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3644 operand_count = xtensa_opcode_num_operands (isa, opcode);
3645 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3647 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3652 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3657 uint32 rawval0, rawval1, rawval2;
3659 if (o_operand_count + 1 != operand_count)
3661 if (xtensa_operand_get_field (isa, opcode, 0,
3662 fmt, 0, slotbuf, &rawval0) != 0)
3664 if (xtensa_operand_get_field (isa, opcode, 1,
3665 fmt, 0, slotbuf, &rawval1) != 0)
3667 if (xtensa_operand_get_field (isa, opcode, 2,
3668 fmt, 0, slotbuf, &rawval2) != 0)
3671 if (rawval1 != rawval2)
3673 if (rawval0 == rawval1) /* it is a nop */
3677 for (i = 0; i < o_operand_count; ++i)
3679 if (xtensa_operand_get_field (isa, opcode, i, fmt, 0,
3681 || xtensa_operand_decode (isa, opcode, i, &value))
3684 /* PC-relative branches need adjustment, but
3685 the PC-rel operand will always have a relocation. */
3687 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3689 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3690 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3695 if (xtensa_format_set_slot (isa, o_fmt, 0,
3696 o_insnbuf, o_slotbuf) != 0)
3700 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3701 content_length - offset);
3709 /* Attempt to widen an instruction. Return true if the widening is
3710 valid. If the do_it parameter is non-zero, then the action should
3711 be performed inplace into the contents. Otherwise, do not modify
3712 the contents. The set of valid widenings are specified by a string
3713 table but require some special case operand checks in some
3717 widen_instruction (bfd_byte *contents,
3718 bfd_size_type content_length,
3719 bfd_size_type offset,
3722 xtensa_opcode opcode;
3723 bfd_size_type insn_len, opi;
3724 xtensa_isa isa = xtensa_default_isa;
3725 xtensa_format fmt, o_fmt;
3727 static xtensa_insnbuf insnbuf = NULL;
3728 static xtensa_insnbuf slotbuf = NULL;
3729 static xtensa_insnbuf o_insnbuf = NULL;
3730 static xtensa_insnbuf o_slotbuf = NULL;
3732 if (insnbuf == NULL)
3734 insnbuf = xtensa_insnbuf_alloc (isa);
3735 slotbuf = xtensa_insnbuf_alloc (isa);
3736 o_insnbuf = xtensa_insnbuf_alloc (isa);
3737 o_slotbuf = xtensa_insnbuf_alloc (isa);
3740 BFD_ASSERT (offset < content_length);
3742 if (content_length < 2)
3745 /* We will hand code a few of these for a little while.
3746 These have all been specified in the assembler aleady. */
3747 xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset],
3748 content_length - offset);
3749 fmt = xtensa_format_decode (isa, insnbuf);
3750 if (xtensa_format_num_slots (isa, fmt) != 1)
3753 if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0)
3756 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3757 if (opcode == XTENSA_UNDEFINED)
3759 insn_len = xtensa_format_length (isa, fmt);
3760 if (insn_len > content_length)
3763 for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); ++opi)
3765 bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0);
3766 bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0
3767 || strcmp ("bnez", widenable[opi].wide) == 0);
3769 if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow))
3771 uint32 value, newval;
3772 int i, operand_count, o_operand_count, check_operand_count;
3773 xtensa_opcode o_opcode;
3775 /* Address does not matter in this case. We might need to fix it
3776 to handle branches/jumps. */
3777 bfd_vma self_address = 0;
3779 o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide);
3780 if (o_opcode == XTENSA_UNDEFINED)
3782 o_fmt = get_single_format (o_opcode);
3783 if (o_fmt == XTENSA_UNDEFINED)
3786 if (xtensa_format_length (isa, fmt) != 2
3787 || xtensa_format_length (isa, o_fmt) != 3)
3790 xtensa_format_encode (isa, o_fmt, o_insnbuf);
3791 operand_count = xtensa_opcode_num_operands (isa, opcode);
3792 o_operand_count = xtensa_opcode_num_operands (isa, o_opcode);
3793 check_operand_count = o_operand_count;
3795 if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0)
3800 if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count)
3805 uint32 rawval0, rawval1;
3807 if (o_operand_count != operand_count + 1)
3809 if (xtensa_operand_get_field (isa, opcode, 0,
3810 fmt, 0, slotbuf, &rawval0) != 0)
3812 if (xtensa_operand_get_field (isa, opcode, 1,
3813 fmt, 0, slotbuf, &rawval1) != 0)
3815 if (rawval0 == rawval1) /* it is a nop */
3819 check_operand_count--;
3821 for (i = 0; i < check_operand_count; ++i)
3824 if (is_or && i == o_operand_count - 1)
3826 if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0,
3828 || xtensa_operand_decode (isa, opcode, new_i, &value))
3831 /* PC-relative branches need adjustment, but
3832 the PC-rel operand will always have a relocation. */
3834 if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval,
3836 || xtensa_operand_encode (isa, o_opcode, i, &newval)
3837 || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0,
3842 if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf))
3846 xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset,
3847 content_length - offset);
3855 /* Code for transforming CALLs at link-time. */
3857 static bfd_reloc_status_type
3858 elf_xtensa_do_asm_simplify (bfd_byte *contents,
3860 bfd_vma content_length,
3861 char **error_message)
3863 static xtensa_insnbuf insnbuf = NULL;
3864 static xtensa_insnbuf slotbuf = NULL;
3865 xtensa_format core_format = XTENSA_UNDEFINED;
3866 xtensa_opcode opcode;
3867 xtensa_opcode direct_call_opcode;
3868 xtensa_isa isa = xtensa_default_isa;
3869 bfd_byte *chbuf = contents + address;
3872 if (insnbuf == NULL)
3874 insnbuf = xtensa_insnbuf_alloc (isa);
3875 slotbuf = xtensa_insnbuf_alloc (isa);
3878 if (content_length < address)
3880 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3881 return bfd_reloc_other;
3884 opcode = get_expanded_call_opcode (chbuf, content_length - address, 0);
3885 direct_call_opcode = swap_callx_for_call_opcode (opcode);
3886 if (direct_call_opcode == XTENSA_UNDEFINED)
3888 *error_message = _("Attempt to convert L32R/CALLX to CALL failed");
3889 return bfd_reloc_other;
3892 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3893 core_format = xtensa_format_lookup (isa, "x24");
3894 opcode = xtensa_opcode_lookup (isa, "or");
3895 xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode);
3896 for (opn = 0; opn < 3; opn++)
3899 xtensa_operand_encode (isa, opcode, opn, ®no);
3900 xtensa_operand_set_field (isa, opcode, opn, core_format, 0,
3903 xtensa_format_encode (isa, core_format, insnbuf);
3904 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3905 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address);
3907 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3908 xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode);
3909 xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0);
3911 xtensa_format_encode (isa, core_format, insnbuf);
3912 xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf);
3913 xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3,
3914 content_length - address - 3);
3916 return bfd_reloc_ok;
3920 static bfd_reloc_status_type
3921 contract_asm_expansion (bfd_byte *contents,
3922 bfd_vma content_length,
3923 Elf_Internal_Rela *irel,
3924 char **error_message)
3926 bfd_reloc_status_type retval =
3927 elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length,
3930 if (retval != bfd_reloc_ok)
3931 return bfd_reloc_dangerous;
3933 /* Update the irel->r_offset field so that the right immediate and
3934 the right instruction are modified during the relocation. */
3935 irel->r_offset += 3;
3936 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP);
3937 return bfd_reloc_ok;
3941 static xtensa_opcode
3942 swap_callx_for_call_opcode (xtensa_opcode opcode)
3944 init_call_opcodes ();
3946 if (opcode == callx0_op) return call0_op;
3947 if (opcode == callx4_op) return call4_op;
3948 if (opcode == callx8_op) return call8_op;
3949 if (opcode == callx12_op) return call12_op;
3951 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3952 return XTENSA_UNDEFINED;
3956 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3957 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3958 If not, return XTENSA_UNDEFINED. */
3960 #define L32R_TARGET_REG_OPERAND 0
3961 #define CONST16_TARGET_REG_OPERAND 0
3962 #define CALLN_SOURCE_OPERAND 0
3964 static xtensa_opcode
3965 get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r)
3967 static xtensa_insnbuf insnbuf = NULL;
3968 static xtensa_insnbuf slotbuf = NULL;
3970 xtensa_opcode opcode;
3971 xtensa_isa isa = xtensa_default_isa;
3972 uint32 regno, const16_regno, call_regno;
3975 if (insnbuf == NULL)
3977 insnbuf = xtensa_insnbuf_alloc (isa);
3978 slotbuf = xtensa_insnbuf_alloc (isa);
3981 xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize);
3982 fmt = xtensa_format_decode (isa, insnbuf);
3983 if (fmt == XTENSA_UNDEFINED
3984 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
3985 return XTENSA_UNDEFINED;
3987 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
3988 if (opcode == XTENSA_UNDEFINED)
3989 return XTENSA_UNDEFINED;
3991 if (opcode == get_l32r_opcode ())
3994 *p_uses_l32r = TRUE;
3995 if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND,
3996 fmt, 0, slotbuf, ®no)
3997 || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND,
3999 return XTENSA_UNDEFINED;
4001 else if (opcode == get_const16_opcode ())
4004 *p_uses_l32r = FALSE;
4005 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4006 fmt, 0, slotbuf, ®no)
4007 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4009 return XTENSA_UNDEFINED;
4011 /* Check that the next instruction is also CONST16. */
4012 offset += xtensa_format_length (isa, fmt);
4013 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4014 fmt = xtensa_format_decode (isa, insnbuf);
4015 if (fmt == XTENSA_UNDEFINED
4016 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4017 return XTENSA_UNDEFINED;
4018 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4019 if (opcode != get_const16_opcode ())
4020 return XTENSA_UNDEFINED;
4022 if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND,
4023 fmt, 0, slotbuf, &const16_regno)
4024 || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND,
4026 || const16_regno != regno)
4027 return XTENSA_UNDEFINED;
4030 return XTENSA_UNDEFINED;
4032 /* Next instruction should be an CALLXn with operand 0 == regno. */
4033 offset += xtensa_format_length (isa, fmt);
4034 xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset);
4035 fmt = xtensa_format_decode (isa, insnbuf);
4036 if (fmt == XTENSA_UNDEFINED
4037 || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf))
4038 return XTENSA_UNDEFINED;
4039 opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf);
4040 if (opcode == XTENSA_UNDEFINED
4041 || !is_indirect_call_opcode (opcode))
4042 return XTENSA_UNDEFINED;
4044 if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND,
4045 fmt, 0, slotbuf, &call_regno)
4046 || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND,
4048 return XTENSA_UNDEFINED;
4050 if (call_regno != regno)
4051 return XTENSA_UNDEFINED;
4057 /* Data structures used during relaxation. */
4059 /* r_reloc: relocation values. */
4061 /* Through the relaxation process, we need to keep track of the values
4062 that will result from evaluating relocations. The standard ELF
4063 relocation structure is not sufficient for this purpose because we're
4064 operating on multiple input files at once, so we need to know which
4065 input file a relocation refers to. The r_reloc structure thus
4066 records both the input file (bfd) and ELF relocation.
4068 For efficiency, an r_reloc also contains a "target_offset" field to
4069 cache the target-section-relative offset value that is represented by
4072 The r_reloc also contains a virtual offset that allows multiple
4073 inserted literals to be placed at the same "address" with
4074 different offsets. */
4076 typedef struct r_reloc_struct r_reloc;
4078 struct r_reloc_struct
4081 Elf_Internal_Rela rela;
4082 bfd_vma target_offset;
4083 bfd_vma virtual_offset;
4087 /* The r_reloc structure is included by value in literal_value, but not
4088 every literal_value has an associated relocation -- some are simple
4089 constants. In such cases, we set all the fields in the r_reloc
4090 struct to zero. The r_reloc_is_const function should be used to
4091 detect this case. */
4094 r_reloc_is_const (const r_reloc *r_rel)
4096 return (r_rel->abfd == NULL);
4101 r_reloc_get_target_offset (const r_reloc *r_rel)
4103 bfd_vma target_offset;
4104 unsigned long r_symndx;
4106 BFD_ASSERT (!r_reloc_is_const (r_rel));
4107 r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4108 target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx);
4109 return (target_offset + r_rel->rela.r_addend);
4113 static struct elf_link_hash_entry *
4114 r_reloc_get_hash_entry (const r_reloc *r_rel)
4116 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4117 return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx);
4122 r_reloc_get_section (const r_reloc *r_rel)
4124 unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info);
4125 return get_elf_r_symndx_section (r_rel->abfd, r_symndx);
4130 r_reloc_is_defined (const r_reloc *r_rel)
4136 sec = r_reloc_get_section (r_rel);
4137 if (sec == bfd_abs_section_ptr
4138 || sec == bfd_com_section_ptr
4139 || sec == bfd_und_section_ptr)
4146 r_reloc_init (r_reloc *r_rel,
4148 Elf_Internal_Rela *irel,
4150 bfd_size_type content_length)
4153 reloc_howto_type *howto;
4157 r_rel->rela = *irel;
4159 r_rel->target_offset = r_reloc_get_target_offset (r_rel);
4160 r_rel->virtual_offset = 0;
4161 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
4162 howto = &elf_howto_table[r_type];
4163 if (howto->partial_inplace)
4165 bfd_vma inplace_val;
4166 BFD_ASSERT (r_rel->rela.r_offset < content_length);
4168 inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]);
4169 r_rel->target_offset += inplace_val;
4173 memset (r_rel, 0, sizeof (r_reloc));
4180 print_r_reloc (FILE *fp, const r_reloc *r_rel)
4182 if (r_reloc_is_defined (r_rel))
4184 asection *sec = r_reloc_get_section (r_rel);
4185 fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name);
4187 else if (r_reloc_get_hash_entry (r_rel))
4188 fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string);
4190 fprintf (fp, " ?? + ");
4192 fprintf_vma (fp, r_rel->target_offset);
4193 if (r_rel->virtual_offset)
4195 fprintf (fp, " + ");
4196 fprintf_vma (fp, r_rel->virtual_offset);
4205 /* source_reloc: relocations that reference literals. */
4207 /* To determine whether literals can be coalesced, we need to first
4208 record all the relocations that reference the literals. The
4209 source_reloc structure below is used for this purpose. The
4210 source_reloc entries are kept in a per-literal-section array, sorted
4211 by offset within the literal section (i.e., target offset).
4213 The source_sec and r_rel.rela.r_offset fields identify the source of
4214 the relocation. The r_rel field records the relocation value, i.e.,
4215 the offset of the literal being referenced. The opnd field is needed
4216 to determine the range of the immediate field to which the relocation
4217 applies, so we can determine whether another literal with the same
4218 value is within range. The is_null field is true when the relocation
4219 is being removed (e.g., when an L32R is being removed due to a CALLX
4220 that is converted to a direct CALL). */
4222 typedef struct source_reloc_struct source_reloc;
4224 struct source_reloc_struct
4226 asection *source_sec;
4228 xtensa_opcode opcode;
4230 bfd_boolean is_null;
4231 bfd_boolean is_abs_literal;
4236 init_source_reloc (source_reloc *reloc,
4237 asection *source_sec,
4238 const r_reloc *r_rel,
4239 xtensa_opcode opcode,
4241 bfd_boolean is_abs_literal)
4243 reloc->source_sec = source_sec;
4244 reloc->r_rel = *r_rel;
4245 reloc->opcode = opcode;
4247 reloc->is_null = FALSE;
4248 reloc->is_abs_literal = is_abs_literal;
4252 /* Find the source_reloc for a particular source offset and relocation
4253 type. Note that the array is sorted by _target_ offset, so this is
4254 just a linear search. */
4256 static source_reloc *
4257 find_source_reloc (source_reloc *src_relocs,
4260 Elf_Internal_Rela *irel)
4264 for (i = 0; i < src_count; i++)
4266 if (src_relocs[i].source_sec == sec
4267 && src_relocs[i].r_rel.rela.r_offset == irel->r_offset
4268 && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info)
4269 == ELF32_R_TYPE (irel->r_info)))
4270 return &src_relocs[i];
4278 source_reloc_compare (const void *ap, const void *bp)
4280 const source_reloc *a = (const source_reloc *) ap;
4281 const source_reloc *b = (const source_reloc *) bp;
4283 if (a->r_rel.target_offset != b->r_rel.target_offset)
4284 return (a->r_rel.target_offset - b->r_rel.target_offset);
4286 /* We don't need to sort on these criteria for correctness,
4287 but enforcing a more strict ordering prevents unstable qsort
4288 from behaving differently with different implementations.
4289 Without the code below we get correct but different results
4290 on Solaris 2.7 and 2.8. We would like to always produce the
4291 same results no matter the host. */
4293 if ((!a->is_null) - (!b->is_null))
4294 return ((!a->is_null) - (!b->is_null));
4295 return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela);
4299 /* Literal values and value hash tables. */
4301 /* Literals with the same value can be coalesced. The literal_value
4302 structure records the value of a literal: the "r_rel" field holds the
4303 information from the relocation on the literal (if there is one) and
4304 the "value" field holds the contents of the literal word itself.
4306 The value_map structure records a literal value along with the
4307 location of a literal holding that value. The value_map hash table
4308 is indexed by the literal value, so that we can quickly check if a
4309 particular literal value has been seen before and is thus a candidate
4312 typedef struct literal_value_struct literal_value;
4313 typedef struct value_map_struct value_map;
4314 typedef struct value_map_hash_table_struct value_map_hash_table;
4316 struct literal_value_struct
4319 unsigned long value;
4320 bfd_boolean is_abs_literal;
4323 struct value_map_struct
4325 literal_value val; /* The literal value. */
4326 r_reloc loc; /* Location of the literal. */
4330 struct value_map_hash_table_struct
4332 unsigned bucket_count;
4333 value_map **buckets;
4335 bfd_boolean has_last_loc;
4341 init_literal_value (literal_value *lit,
4342 const r_reloc *r_rel,
4343 unsigned long value,
4344 bfd_boolean is_abs_literal)
4346 lit->r_rel = *r_rel;
4348 lit->is_abs_literal = is_abs_literal;
4353 literal_value_equal (const literal_value *src1,
4354 const literal_value *src2,
4355 bfd_boolean final_static_link)
4357 struct elf_link_hash_entry *h1, *h2;
4359 if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel))
4362 if (r_reloc_is_const (&src1->r_rel))
4363 return (src1->value == src2->value);
4365 if (ELF32_R_TYPE (src1->r_rel.rela.r_info)
4366 != ELF32_R_TYPE (src2->r_rel.rela.r_info))
4369 if (src1->r_rel.target_offset != src2->r_rel.target_offset)
4372 if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset)
4375 if (src1->value != src2->value)
4378 /* Now check for the same section (if defined) or the same elf_hash
4379 (if undefined or weak). */
4380 h1 = r_reloc_get_hash_entry (&src1->r_rel);
4381 h2 = r_reloc_get_hash_entry (&src2->r_rel);
4382 if (r_reloc_is_defined (&src1->r_rel)
4383 && (final_static_link
4384 || ((!h1 || h1->root.type != bfd_link_hash_defweak)
4385 && (!h2 || h2->root.type != bfd_link_hash_defweak))))
4387 if (r_reloc_get_section (&src1->r_rel)
4388 != r_reloc_get_section (&src2->r_rel))
4393 /* Require that the hash entries (i.e., symbols) be identical. */
4394 if (h1 != h2 || h1 == 0)
4398 if (src1->is_abs_literal != src2->is_abs_literal)
4405 /* Must be power of 2. */
4406 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4408 static value_map_hash_table *
4409 value_map_hash_table_init (void)
4411 value_map_hash_table *values;
4413 values = (value_map_hash_table *)
4414 bfd_zmalloc (sizeof (value_map_hash_table));
4415 values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT;
4417 values->buckets = (value_map **)
4418 bfd_zmalloc (sizeof (value_map *) * values->bucket_count);
4419 if (values->buckets == NULL)
4424 values->has_last_loc = FALSE;
4431 value_map_hash_table_delete (value_map_hash_table *table)
4433 free (table->buckets);
4439 hash_bfd_vma (bfd_vma val)
4441 return (val >> 2) + (val >> 10);
4446 literal_value_hash (const literal_value *src)
4450 hash_val = hash_bfd_vma (src->value);
4451 if (!r_reloc_is_const (&src->r_rel))
4455 hash_val += hash_bfd_vma (src->is_abs_literal * 1000);
4456 hash_val += hash_bfd_vma (src->r_rel.target_offset);
4457 hash_val += hash_bfd_vma (src->r_rel.virtual_offset);
4459 /* Now check for the same section and the same elf_hash. */
4460 if (r_reloc_is_defined (&src->r_rel))
4461 sec_or_hash = r_reloc_get_section (&src->r_rel);
4463 sec_or_hash = r_reloc_get_hash_entry (&src->r_rel);
4464 hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash);
4470 /* Check if the specified literal_value has been seen before. */
4473 value_map_get_cached_value (value_map_hash_table *map,
4474 const literal_value *val,
4475 bfd_boolean final_static_link)
4481 idx = literal_value_hash (val);
4482 idx = idx & (map->bucket_count - 1);
4483 bucket = map->buckets[idx];
4484 for (map_e = bucket; map_e; map_e = map_e->next)
4486 if (literal_value_equal (&map_e->val, val, final_static_link))
4493 /* Record a new literal value. It is illegal to call this if VALUE
4494 already has an entry here. */
4497 add_value_map (value_map_hash_table *map,
4498 const literal_value *val,
4500 bfd_boolean final_static_link)
4502 value_map **bucket_p;
4505 value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map));
4508 bfd_set_error (bfd_error_no_memory);
4512 BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link));
4516 idx = literal_value_hash (val);
4517 idx = idx & (map->bucket_count - 1);
4518 bucket_p = &map->buckets[idx];
4520 val_e->next = *bucket_p;
4523 /* FIXME: Consider resizing the hash table if we get too many entries. */
4529 /* Lists of text actions (ta_) for narrowing, widening, longcall
4530 conversion, space fill, code & literal removal, etc. */
4532 /* The following text actions are generated:
4534 "ta_remove_insn" remove an instruction or instructions
4535 "ta_remove_longcall" convert longcall to call
4536 "ta_convert_longcall" convert longcall to nop/call
4537 "ta_narrow_insn" narrow a wide instruction
4538 "ta_widen" widen a narrow instruction
4539 "ta_fill" add fill or remove fill
4540 removed < 0 is a fill; branches to the fill address will be
4541 changed to address + fill size (e.g., address - removed)
4542 removed >= 0 branches to the fill address will stay unchanged
4543 "ta_remove_literal" remove a literal; this action is
4544 indicated when a literal is removed
4546 "ta_add_literal" insert a new literal; this action is
4547 indicated when a literal has been moved.
4548 It may use a virtual_offset because
4549 multiple literals can be placed at the
4552 For each of these text actions, we also record the number of bytes
4553 removed by performing the text action. In the case of a "ta_widen"
4554 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4556 typedef struct text_action_struct text_action;
4557 typedef struct text_action_list_struct text_action_list;
4558 typedef enum text_action_enum_t text_action_t;
4560 enum text_action_enum_t
4563 ta_remove_insn, /* removed = -size */
4564 ta_remove_longcall, /* removed = -size */
4565 ta_convert_longcall, /* removed = 0 */
4566 ta_narrow_insn, /* removed = -1 */
4567 ta_widen_insn, /* removed = +1 */
4568 ta_fill, /* removed = +size */
4574 /* Structure for a text action record. */
4575 struct text_action_struct
4577 text_action_t action;
4578 asection *sec; /* Optional */
4580 bfd_vma virtual_offset; /* Zero except for adding literals. */
4582 literal_value value; /* Only valid when adding literals. */
4588 /* List of all of the actions taken on a text section. */
4589 struct text_action_list_struct
4595 static text_action *
4596 find_fill_action (text_action_list *l, asection *sec, bfd_vma offset)
4600 /* It is not necessary to fill at the end of a section. */
4601 if (sec->size == offset)
4604 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4606 text_action *t = *m_p;
4607 /* When the action is another fill at the same address,
4608 just increase the size. */
4609 if (t->offset == offset && t->action == ta_fill)
4617 compute_removed_action_diff (const text_action *ta,
4621 int removable_space)
4624 int current_removed = 0;
4627 current_removed = ta->removed_bytes;
4629 BFD_ASSERT (ta == NULL || ta->offset == offset);
4630 BFD_ASSERT (ta == NULL || ta->action == ta_fill);
4632 /* It is not necessary to fill at the end of a section. Clean this up. */
4633 if (sec->size == offset)
4634 new_removed = removable_space - 0;
4638 int added = -removed - current_removed;
4639 /* Ignore multiples of the section alignment. */
4640 added = ((1 << sec->alignment_power) - 1) & added;
4641 new_removed = (-added);
4643 /* Modify for removable. */
4644 space = removable_space - new_removed;
4645 new_removed = (removable_space
4646 - (((1 << sec->alignment_power) - 1) & space));
4648 return (new_removed - current_removed);
4653 adjust_fill_action (text_action *ta, int fill_diff)
4655 ta->removed_bytes += fill_diff;
4659 /* Add a modification action to the text. For the case of adding or
4660 removing space, modify any current fill and assume that
4661 "unreachable_space" bytes can be freely contracted. Note that a
4662 negative removed value is a fill. */
4665 text_action_add (text_action_list *l,
4666 text_action_t action,
4674 /* It is not necessary to fill at the end of a section. */
4675 if (action == ta_fill && sec->size == offset)
4678 /* It is not necessary to fill 0 bytes. */
4679 if (action == ta_fill && removed == 0)
4682 for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next)
4684 text_action *t = *m_p;
4685 /* When the action is another fill at the same address,
4686 just increase the size. */
4687 if (t->offset == offset && t->action == ta_fill && action == ta_fill)
4689 t->removed_bytes += removed;
4694 /* Create a new record and fill it up. */
4695 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4696 ta->action = action;
4698 ta->offset = offset;
4699 ta->removed_bytes = removed;
4706 text_action_add_literal (text_action_list *l,
4707 text_action_t action,
4709 const literal_value *value,
4714 asection *sec = r_reloc_get_section (loc);
4715 bfd_vma offset = loc->target_offset;
4716 bfd_vma virtual_offset = loc->virtual_offset;
4718 BFD_ASSERT (action == ta_add_literal);
4720 for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next)
4722 if ((*m_p)->offset > offset
4723 && ((*m_p)->offset != offset
4724 || (*m_p)->virtual_offset > virtual_offset))
4728 /* Create a new record and fill it up. */
4729 ta = (text_action *) bfd_zmalloc (sizeof (text_action));
4730 ta->action = action;
4732 ta->offset = offset;
4733 ta->virtual_offset = virtual_offset;
4735 ta->removed_bytes = removed;
4742 offset_with_removed_text (text_action_list *action_list, bfd_vma offset)
4747 for (r = action_list->head; r && r->offset <= offset; r = r->next)
4749 if (r->offset < offset
4750 || (r->action == ta_fill && r->removed_bytes < 0))
4751 removed += r->removed_bytes;
4754 return (offset - removed);
4759 offset_with_removed_text_before_fill (text_action_list *action_list,
4765 for (r = action_list->head; r && r->offset < offset; r = r->next)
4766 removed += r->removed_bytes;
4768 return (offset - removed);
4772 /* The find_insn_action routine will only find non-fill actions. */
4774 static text_action *
4775 find_insn_action (text_action_list *action_list, bfd_vma offset)
4778 for (t = action_list->head; t; t = t->next)
4780 if (t->offset == offset)
4787 case ta_remove_insn:
4788 case ta_remove_longcall:
4789 case ta_convert_longcall:
4790 case ta_narrow_insn:
4793 case ta_remove_literal:
4794 case ta_add_literal:
4807 print_action_list (FILE *fp, text_action_list *action_list)
4811 fprintf (fp, "Text Action\n");
4812 for (r = action_list->head; r != NULL; r = r->next)
4814 const char *t = "unknown";
4817 case ta_remove_insn:
4818 t = "remove_insn"; break;
4819 case ta_remove_longcall:
4820 t = "remove_longcall"; break;
4821 case ta_convert_longcall:
4822 t = "remove_longcall"; break;
4823 case ta_narrow_insn:
4824 t = "narrow_insn"; break;
4826 t = "widen_insn"; break;
4831 case ta_remove_literal:
4832 t = "remove_literal"; break;
4833 case ta_add_literal:
4834 t = "add_literal"; break;
4837 fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n",
4838 r->sec->owner->filename,
4839 r->sec->name, r->offset, t, r->removed_bytes);
4846 /* Lists of literals being coalesced or removed. */
4848 /* In the usual case, the literal identified by "from" is being
4849 coalesced with another literal identified by "to". If the literal is
4850 unused and is being removed altogether, "to.abfd" will be NULL.
4851 The removed_literal entries are kept on a per-section list, sorted
4852 by the "from" offset field. */
4854 typedef struct removed_literal_struct removed_literal;
4855 typedef struct removed_literal_list_struct removed_literal_list;
4857 struct removed_literal_struct
4861 removed_literal *next;
4864 struct removed_literal_list_struct
4866 removed_literal *head;
4867 removed_literal *tail;
4871 /* Record that the literal at "from" is being removed. If "to" is not
4872 NULL, the "from" literal is being coalesced with the "to" literal. */
4875 add_removed_literal (removed_literal_list *removed_list,
4876 const r_reloc *from,
4879 removed_literal *r, *new_r, *next_r;
4881 new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal));
4883 new_r->from = *from;
4887 new_r->to.abfd = NULL;
4890 r = removed_list->head;
4893 removed_list->head = new_r;
4894 removed_list->tail = new_r;
4896 /* Special check for common case of append. */
4897 else if (removed_list->tail->from.target_offset < from->target_offset)
4899 removed_list->tail->next = new_r;
4900 removed_list->tail = new_r;
4904 while (r->from.target_offset < from->target_offset && r->next)
4910 new_r->next = next_r;
4912 removed_list->tail = new_r;
4917 /* Check if the list of removed literals contains an entry for the
4918 given address. Return the entry if found. */
4920 static removed_literal *
4921 find_removed_literal (removed_literal_list *removed_list, bfd_vma addr)
4923 removed_literal *r = removed_list->head;
4924 while (r && r->from.target_offset < addr)
4926 if (r && r->from.target_offset == addr)
4935 print_removed_literals (FILE *fp, removed_literal_list *removed_list)
4938 r = removed_list->head;
4940 fprintf (fp, "Removed Literals\n");
4941 for (; r != NULL; r = r->next)
4943 print_r_reloc (fp, &r->from);
4944 fprintf (fp, " => ");
4945 if (r->to.abfd == NULL)
4946 fprintf (fp, "REMOVED");
4948 print_r_reloc (fp, &r->to);
4956 /* Per-section data for relaxation. */
4958 typedef struct reloc_bfd_fix_struct reloc_bfd_fix;
4960 struct xtensa_relax_info_struct
4962 bfd_boolean is_relaxable_literal_section;
4963 bfd_boolean is_relaxable_asm_section;
4964 int visited; /* Number of times visited. */
4966 source_reloc *src_relocs; /* Array[src_count]. */
4968 int src_next; /* Next src_relocs entry to assign. */
4970 removed_literal_list removed_list;
4971 text_action_list action_list;
4973 reloc_bfd_fix *fix_list;
4974 reloc_bfd_fix *fix_array;
4975 unsigned fix_array_count;
4977 /* Support for expanding the reloc array that is stored
4978 in the section structure. If the relocations have been
4979 reallocated, the newly allocated relocations will be referenced
4980 here along with the actual size allocated. The relocation
4981 count will always be found in the section structure. */
4982 Elf_Internal_Rela *allocated_relocs;
4983 unsigned relocs_count;
4984 unsigned allocated_relocs_count;
4987 struct elf_xtensa_section_data
4989 struct bfd_elf_section_data elf;
4990 xtensa_relax_info relax_info;
4995 elf_xtensa_new_section_hook (bfd *abfd, asection *sec)
4997 struct elf_xtensa_section_data *sdata;
4998 bfd_size_type amt = sizeof (*sdata);
5000 sdata = (struct elf_xtensa_section_data *) bfd_zalloc (abfd, amt);
5003 sec->used_by_bfd = (void *) 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 static bfd_boolean check_section_ebb_reduces (const ebb_constraint *);
5758 static void text_action_add_proposed
5759 (text_action_list *, const ebb_constraint *, asection *);
5760 static int compute_fill_extra_space (property_table_entry *);
5763 static bfd_boolean compute_removed_literals
5764 (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *);
5765 static Elf_Internal_Rela *get_irel_at_offset
5766 (asection *, Elf_Internal_Rela *, bfd_vma);
5767 static bfd_boolean is_removable_literal
5768 (const source_reloc *, int, const source_reloc *, int);
5769 static bfd_boolean remove_dead_literal
5770 (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *,
5771 Elf_Internal_Rela *, source_reloc *, property_table_entry *, int);
5772 static bfd_boolean identify_literal_placement
5773 (bfd *, asection *, bfd_byte *, struct bfd_link_info *,
5774 value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int,
5775 source_reloc *, property_table_entry *, int, section_cache_t *,
5777 static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *);
5778 static bfd_boolean coalesce_shared_literal
5779 (asection *, source_reloc *, property_table_entry *, int, value_map *);
5780 static bfd_boolean move_shared_literal
5781 (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *,
5782 int, const r_reloc *, const literal_value *, section_cache_t *);
5785 static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *);
5786 static bfd_boolean translate_section_fixes (asection *);
5787 static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *);
5788 static void translate_reloc (const r_reloc *, r_reloc *);
5789 static void shrink_dynamic_reloc_sections
5790 (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *);
5791 static bfd_boolean move_literal
5792 (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *,
5793 xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *);
5794 static bfd_boolean relax_property_section
5795 (bfd *, asection *, struct bfd_link_info *);
5798 static bfd_boolean relax_section_symbols (bfd *, asection *);
5802 elf_xtensa_relax_section (bfd *abfd,
5804 struct bfd_link_info *link_info,
5807 static value_map_hash_table *values = NULL;
5808 static bfd_boolean relocations_analyzed = FALSE;
5809 xtensa_relax_info *relax_info;
5811 if (!relocations_analyzed)
5813 /* Do some overall initialization for relaxation. */
5814 values = value_map_hash_table_init ();
5817 relaxing_section = TRUE;
5818 if (!analyze_relocations (link_info))
5820 relocations_analyzed = TRUE;
5824 /* Don't mess with linker-created sections. */
5825 if ((sec->flags & SEC_LINKER_CREATED) != 0)
5828 relax_info = get_xtensa_relax_info (sec);
5829 BFD_ASSERT (relax_info != NULL);
5831 switch (relax_info->visited)
5834 /* Note: It would be nice to fold this pass into
5835 analyze_relocations, but it is important for this step that the
5836 sections be examined in link order. */
5837 if (!compute_removed_literals (abfd, sec, link_info, values))
5844 value_map_hash_table_delete (values);
5846 if (!relax_section (abfd, sec, link_info))
5852 if (!relax_section_symbols (abfd, sec))
5857 relax_info->visited++;
5862 /* Initialization for relaxation. */
5864 /* This function is called once at the start of relaxation. It scans
5865 all the input sections and marks the ones that are relaxable (i.e.,
5866 literal sections with L32R relocations against them), and then
5867 collects source_reloc information for all the relocations against
5868 those relaxable sections. During this process, it also detects
5869 longcalls, i.e., calls relaxed by the assembler into indirect
5870 calls, that can be optimized back into direct calls. Within each
5871 extended basic block (ebb) containing an optimized longcall, it
5872 computes a set of "text actions" that can be performed to remove
5873 the L32R associated with the longcall while optionally preserving
5874 branch target alignments. */
5877 analyze_relocations (struct bfd_link_info *link_info)
5881 bfd_boolean is_relaxable = FALSE;
5883 /* Initialize the per-section relaxation info. */
5884 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5885 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5887 init_xtensa_relax_info (sec);
5890 /* Mark relaxable sections (and count relocations against each one). */
5891 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5892 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5894 if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable))
5898 /* Bail out if there are no relaxable sections. */
5902 /* Allocate space for source_relocs. */
5903 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5904 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5906 xtensa_relax_info *relax_info;
5908 relax_info = get_xtensa_relax_info (sec);
5909 if (relax_info->is_relaxable_literal_section
5910 || relax_info->is_relaxable_asm_section)
5912 relax_info->src_relocs = (source_reloc *)
5913 bfd_malloc (relax_info->src_count * sizeof (source_reloc));
5917 /* Collect info on relocations against each relaxable section. */
5918 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5919 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5921 if (!collect_source_relocs (abfd, sec, link_info))
5925 /* Compute the text actions. */
5926 for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next)
5927 for (sec = abfd->sections; sec != NULL; sec = sec->next)
5929 if (!compute_text_actions (abfd, sec, link_info))
5937 /* Find all the sections that might be relaxed. The motivation for
5938 this pass is that collect_source_relocs() needs to record _all_ the
5939 relocations that target each relaxable section. That is expensive
5940 and unnecessary unless the target section is actually going to be
5941 relaxed. This pass identifies all such sections by checking if
5942 they have L32Rs pointing to them. In the process, the total number
5943 of relocations targeting each section is also counted so that we
5944 know how much space to allocate for source_relocs against each
5945 relaxable literal section. */
5948 find_relaxable_sections (bfd *abfd,
5950 struct bfd_link_info *link_info,
5951 bfd_boolean *is_relaxable_p)
5953 Elf_Internal_Rela *internal_relocs;
5955 bfd_boolean ok = TRUE;
5957 xtensa_relax_info *source_relax_info;
5959 internal_relocs = retrieve_internal_relocs (abfd, sec,
5960 link_info->keep_memory);
5961 if (internal_relocs == NULL)
5964 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
5965 if (contents == NULL && sec->size != 0)
5971 source_relax_info = get_xtensa_relax_info (sec);
5972 for (i = 0; i < sec->reloc_count; i++)
5974 Elf_Internal_Rela *irel = &internal_relocs[i];
5976 asection *target_sec;
5977 xtensa_relax_info *target_relax_info;
5979 /* If this section has not already been marked as "relaxable", and
5980 if it contains any ASM_EXPAND relocations (marking expanded
5981 longcalls) that can be optimized into direct calls, then mark
5982 the section as "relaxable". */
5983 if (source_relax_info
5984 && !source_relax_info->is_relaxable_asm_section
5985 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND)
5987 bfd_boolean is_reachable = FALSE;
5988 if (is_resolvable_asm_expansion (abfd, sec, contents, irel,
5989 link_info, &is_reachable)
5992 source_relax_info->is_relaxable_asm_section = TRUE;
5993 *is_relaxable_p = TRUE;
5997 r_reloc_init (&r_rel, abfd, irel, contents,
5998 bfd_get_section_limit (abfd, sec));
6000 target_sec = r_reloc_get_section (&r_rel);
6001 target_relax_info = get_xtensa_relax_info (target_sec);
6002 if (!target_relax_info)
6005 /* Count PC-relative operand relocations against the target section.
6006 Note: The conditions tested here must match the conditions under
6007 which init_source_reloc is called in collect_source_relocs(). */
6008 if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))
6009 && (!is_alt_relocation (ELF32_R_TYPE (irel->r_info))
6010 || is_l32r_relocation (abfd, sec, contents, irel)))
6011 target_relax_info->src_count++;
6013 if (is_l32r_relocation (abfd, sec, contents, irel)
6014 && r_reloc_is_defined (&r_rel))
6016 /* Mark the target section as relaxable. */
6017 target_relax_info->is_relaxable_literal_section = TRUE;
6018 *is_relaxable_p = TRUE;
6023 release_contents (sec, contents);
6024 release_internal_relocs (sec, internal_relocs);
6029 /* Record _all_ the relocations that point to relaxable sections, and
6030 get rid of ASM_EXPAND relocs by either converting them to
6031 ASM_SIMPLIFY or by removing them. */
6034 collect_source_relocs (bfd *abfd,
6036 struct bfd_link_info *link_info)
6038 Elf_Internal_Rela *internal_relocs;
6040 bfd_boolean ok = TRUE;
6042 bfd_size_type sec_size;
6044 internal_relocs = retrieve_internal_relocs (abfd, sec,
6045 link_info->keep_memory);
6046 if (internal_relocs == NULL)
6049 sec_size = bfd_get_section_limit (abfd, sec);
6050 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6051 if (contents == NULL && sec_size != 0)
6057 /* Record relocations against relaxable literal sections. */
6058 for (i = 0; i < sec->reloc_count; i++)
6060 Elf_Internal_Rela *irel = &internal_relocs[i];
6062 asection *target_sec;
6063 xtensa_relax_info *target_relax_info;
6065 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6067 target_sec = r_reloc_get_section (&r_rel);
6068 target_relax_info = get_xtensa_relax_info (target_sec);
6070 if (target_relax_info
6071 && (target_relax_info->is_relaxable_literal_section
6072 || target_relax_info->is_relaxable_asm_section))
6074 xtensa_opcode opcode = XTENSA_UNDEFINED;
6076 bfd_boolean is_abs_literal = FALSE;
6078 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6080 /* None of the current alternate relocs are PC-relative,
6081 and only PC-relative relocs matter here. However, we
6082 still need to record the opcode for literal
6084 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6085 if (opcode == get_l32r_opcode ())
6087 is_abs_literal = TRUE;
6091 opcode = XTENSA_UNDEFINED;
6093 else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info)))
6095 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6096 opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6099 if (opcode != XTENSA_UNDEFINED)
6101 int src_next = target_relax_info->src_next++;
6102 source_reloc *s_reloc = &target_relax_info->src_relocs[src_next];
6104 init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd,
6110 /* Now get rid of ASM_EXPAND relocations. At this point, the
6111 src_relocs array for the target literal section may still be
6112 incomplete, but it must at least contain the entries for the L32R
6113 relocations associated with ASM_EXPANDs because they were just
6114 added in the preceding loop over the relocations. */
6116 for (i = 0; i < sec->reloc_count; i++)
6118 Elf_Internal_Rela *irel = &internal_relocs[i];
6119 bfd_boolean is_reachable;
6121 if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info,
6127 Elf_Internal_Rela *l32r_irel;
6129 asection *target_sec;
6130 xtensa_relax_info *target_relax_info;
6132 /* Mark the source_reloc for the L32R so that it will be
6133 removed in compute_removed_literals(), along with the
6134 associated literal. */
6135 l32r_irel = find_associated_l32r_irel (abfd, sec, contents,
6136 irel, internal_relocs);
6137 if (l32r_irel == NULL)
6140 r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size);
6142 target_sec = r_reloc_get_section (&r_rel);
6143 target_relax_info = get_xtensa_relax_info (target_sec);
6145 if (target_relax_info
6146 && (target_relax_info->is_relaxable_literal_section
6147 || target_relax_info->is_relaxable_asm_section))
6149 source_reloc *s_reloc;
6151 /* Search the source_relocs for the entry corresponding to
6152 the l32r_irel. Note: The src_relocs array is not yet
6153 sorted, but it wouldn't matter anyway because we're
6154 searching by source offset instead of target offset. */
6155 s_reloc = find_source_reloc (target_relax_info->src_relocs,
6156 target_relax_info->src_next,
6158 BFD_ASSERT (s_reloc);
6159 s_reloc->is_null = TRUE;
6162 /* Convert this reloc to ASM_SIMPLIFY. */
6163 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
6164 R_XTENSA_ASM_SIMPLIFY);
6165 l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6167 pin_internal_relocs (sec, internal_relocs);
6171 /* It is resolvable but doesn't reach. We resolve now
6172 by eliminating the relocation -- the call will remain
6173 expanded into L32R/CALLX. */
6174 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
6175 pin_internal_relocs (sec, internal_relocs);
6180 release_contents (sec, contents);
6181 release_internal_relocs (sec, internal_relocs);
6186 /* Return TRUE if the asm expansion can be resolved. Generally it can
6187 be resolved on a final link or when a partial link locates it in the
6188 same section as the target. Set "is_reachable" flag if the target of
6189 the call is within the range of a direct call, given the current VMA
6190 for this section and the target section. */
6193 is_resolvable_asm_expansion (bfd *abfd,
6196 Elf_Internal_Rela *irel,
6197 struct bfd_link_info *link_info,
6198 bfd_boolean *is_reachable_p)
6200 asection *target_sec;
6201 bfd_vma target_offset;
6203 xtensa_opcode opcode, direct_call_opcode;
6204 bfd_vma self_address;
6205 bfd_vma dest_address;
6206 bfd_boolean uses_l32r;
6207 bfd_size_type sec_size;
6209 *is_reachable_p = FALSE;
6211 if (contents == NULL)
6214 if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND)
6217 sec_size = bfd_get_section_limit (abfd, sec);
6218 opcode = get_expanded_call_opcode (contents + irel->r_offset,
6219 sec_size - irel->r_offset, &uses_l32r);
6220 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6224 direct_call_opcode = swap_callx_for_call_opcode (opcode);
6225 if (direct_call_opcode == XTENSA_UNDEFINED)
6228 /* Check and see that the target resolves. */
6229 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
6230 if (!r_reloc_is_defined (&r_rel))
6233 target_sec = r_reloc_get_section (&r_rel);
6234 target_offset = r_rel.target_offset;
6236 /* If the target is in a shared library, then it doesn't reach. This
6237 isn't supposed to come up because the compiler should never generate
6238 non-PIC calls on systems that use shared libraries, but the linker
6239 shouldn't crash regardless. */
6240 if (!target_sec->output_section)
6243 /* For relocatable sections, we can only simplify when the output
6244 section of the target is the same as the output section of the
6246 if (link_info->relocatable
6247 && (target_sec->output_section != sec->output_section
6248 || is_reloc_sym_weak (abfd, irel)))
6251 self_address = (sec->output_section->vma
6252 + sec->output_offset + irel->r_offset + 3);
6253 dest_address = (target_sec->output_section->vma
6254 + target_sec->output_offset + target_offset);
6256 *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0,
6257 self_address, dest_address);
6259 if ((self_address >> CALL_SEGMENT_BITS) !=
6260 (dest_address >> CALL_SEGMENT_BITS))
6267 static Elf_Internal_Rela *
6268 find_associated_l32r_irel (bfd *abfd,
6271 Elf_Internal_Rela *other_irel,
6272 Elf_Internal_Rela *internal_relocs)
6276 for (i = 0; i < sec->reloc_count; i++)
6278 Elf_Internal_Rela *irel = &internal_relocs[i];
6280 if (irel == other_irel)
6282 if (irel->r_offset != other_irel->r_offset)
6284 if (is_l32r_relocation (abfd, sec, contents, irel))
6292 /* The compute_text_actions function will build a list of potential
6293 transformation actions for code in the extended basic block of each
6294 longcall that is optimized to a direct call. From this list we
6295 generate a set of actions to actually perform that optimizes for
6296 space and, if not using size_opt, maintains branch target
6299 These actions to be performed are placed on a per-section list.
6300 The actual changes are performed by relax_section() in the second
6304 compute_text_actions (bfd *abfd,
6306 struct bfd_link_info *link_info)
6308 xtensa_relax_info *relax_info;
6310 Elf_Internal_Rela *internal_relocs;
6311 bfd_boolean ok = TRUE;
6313 property_table_entry *prop_table = 0;
6315 bfd_size_type sec_size;
6316 static bfd_boolean no_insn_move = FALSE;
6321 /* Do nothing if the section contains no optimized longcalls. */
6322 relax_info = get_xtensa_relax_info (sec);
6323 BFD_ASSERT (relax_info);
6324 if (!relax_info->is_relaxable_asm_section)
6327 internal_relocs = retrieve_internal_relocs (abfd, sec,
6328 link_info->keep_memory);
6330 if (internal_relocs)
6331 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
6332 internal_reloc_compare);
6334 sec_size = bfd_get_section_limit (abfd, sec);
6335 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
6336 if (contents == NULL && sec_size != 0)
6342 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
6343 XTENSA_PROP_SEC_NAME, FALSE);
6350 for (i = 0; i < sec->reloc_count; i++)
6352 Elf_Internal_Rela *irel = &internal_relocs[i];
6354 property_table_entry *the_entry;
6357 ebb_constraint ebb_table;
6358 bfd_size_type simplify_size;
6360 if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY)
6362 r_offset = irel->r_offset;
6364 simplify_size = get_asm_simplify_size (contents, sec_size, r_offset);
6365 if (simplify_size == 0)
6367 (*_bfd_error_handler)
6368 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6369 sec->owner, sec, r_offset);
6373 /* If the instruction table is not around, then don't do this
6375 the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
6376 sec->vma + irel->r_offset);
6377 if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL)
6379 text_action_add (&relax_info->action_list,
6380 ta_convert_longcall, sec, r_offset,
6385 /* If the next longcall happens to be at the same address as an
6386 unreachable section of size 0, then skip forward. */
6387 ptbl_idx = the_entry - prop_table;
6388 while ((the_entry->flags & XTENSA_PROP_UNREACHABLE)
6389 && the_entry->size == 0
6390 && ptbl_idx + 1 < ptblsize
6391 && (prop_table[ptbl_idx + 1].address
6392 == prop_table[ptbl_idx].address))
6398 if (the_entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM)
6399 /* NO_REORDER is OK */
6402 init_ebb_constraint (&ebb_table);
6403 ebb = &ebb_table.ebb;
6404 init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize,
6405 internal_relocs, sec->reloc_count);
6406 ebb->start_offset = r_offset + simplify_size;
6407 ebb->end_offset = r_offset + simplify_size;
6408 ebb->start_ptbl_idx = ptbl_idx;
6409 ebb->end_ptbl_idx = ptbl_idx;
6410 ebb->start_reloc_idx = i;
6411 ebb->end_reloc_idx = i;
6413 if (!extend_ebb_bounds (ebb)
6414 || !compute_ebb_proposed_actions (&ebb_table)
6415 || !compute_ebb_actions (&ebb_table)
6416 || !check_section_ebb_pcrels_fit (abfd, sec, contents,
6417 internal_relocs, &ebb_table)
6418 || !check_section_ebb_reduces (&ebb_table))
6420 /* If anything goes wrong or we get unlucky and something does
6421 not fit, with our plan because of expansion between
6422 critical branches, just convert to a NOP. */
6424 text_action_add (&relax_info->action_list,
6425 ta_convert_longcall, sec, r_offset, 0);
6426 i = ebb_table.ebb.end_reloc_idx;
6427 free_ebb_constraint (&ebb_table);
6431 text_action_add_proposed (&relax_info->action_list, &ebb_table, sec);
6433 /* Update the index so we do not go looking at the relocations
6434 we have already processed. */
6435 i = ebb_table.ebb.end_reloc_idx;
6436 free_ebb_constraint (&ebb_table);
6440 if (relax_info->action_list.head)
6441 print_action_list (stderr, &relax_info->action_list);
6445 release_contents (sec, contents);
6446 release_internal_relocs (sec, internal_relocs);
6454 /* Find all of the possible actions for an extended basic block. */
6457 compute_ebb_proposed_actions (ebb_constraint *ebb_table)
6459 const ebb_t *ebb = &ebb_table->ebb;
6460 unsigned rel_idx = ebb->start_reloc_idx;
6461 property_table_entry *entry, *start_entry, *end_entry;
6463 start_entry = &ebb->ptbl[ebb->start_ptbl_idx];
6464 end_entry = &ebb->ptbl[ebb->end_ptbl_idx];
6466 for (entry = start_entry; entry <= end_entry; entry++)
6468 bfd_vma offset, start_offset, end_offset;
6469 bfd_size_type insn_len;
6471 start_offset = entry->address - ebb->sec->vma;
6472 end_offset = entry->address + entry->size - ebb->sec->vma;
6474 if (entry == start_entry)
6475 start_offset = ebb->start_offset;
6476 if (entry == end_entry)
6477 end_offset = ebb->end_offset;
6478 offset = start_offset;
6480 if (offset == entry->address - ebb->sec->vma
6481 && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0)
6483 enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN;
6484 BFD_ASSERT (offset != end_offset);
6485 if (offset == end_offset)
6488 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6491 /* Propose no actions for a section with an undecodable offset. */
6494 (*_bfd_error_handler)
6495 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6496 ebb->sec->owner, ebb->sec, offset);
6499 if (check_branch_target_aligned_address (offset, insn_len))
6500 align_type = EBB_REQUIRE_TGT_ALIGN;
6502 ebb_propose_action (ebb_table, align_type, 0,
6503 ta_none, offset, 0, TRUE);
6506 while (offset != end_offset)
6508 Elf_Internal_Rela *irel;
6509 xtensa_opcode opcode;
6511 while (rel_idx < ebb->end_reloc_idx
6512 && (ebb->relocs[rel_idx].r_offset < offset
6513 || (ebb->relocs[rel_idx].r_offset == offset
6514 && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info)
6515 != R_XTENSA_ASM_SIMPLIFY))))
6518 /* Check for longcall. */
6519 irel = &ebb->relocs[rel_idx];
6520 if (irel->r_offset == offset
6521 && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY)
6523 bfd_size_type simplify_size;
6525 simplify_size = get_asm_simplify_size (ebb->contents,
6526 ebb->content_length,
6528 if (simplify_size == 0)
6530 (*_bfd_error_handler)
6531 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6532 ebb->sec->owner, ebb->sec, offset);
6536 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6537 ta_convert_longcall, offset, 0, TRUE);
6539 offset += simplify_size;
6543 insn_len = insn_decode_len (ebb->contents, ebb->content_length,
6545 /* If the instruction is undecodable, then report an error. */
6548 (*_bfd_error_handler)
6549 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6550 ebb->sec->owner, ebb->sec, offset);
6554 if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0
6555 && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6556 && narrow_instruction (ebb->contents, ebb->content_length,
6559 /* Add an instruction narrow action. */
6560 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6561 ta_narrow_insn, offset, 0, FALSE);
6565 if ((entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM) == 0
6566 && widen_instruction (ebb->contents, ebb->content_length,
6569 /* Add an instruction widen action. */
6570 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6571 ta_widen_insn, offset, 0, FALSE);
6575 opcode = insn_decode_opcode (ebb->contents, ebb->content_length,
6577 if (xtensa_opcode_is_loop (xtensa_default_isa, opcode))
6579 /* Check for branch targets. */
6580 ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0,
6581 ta_none, offset, 0, TRUE);
6590 if (ebb->ends_unreachable)
6592 ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0,
6593 ta_fill, ebb->end_offset, 0, TRUE);
6600 /* After all of the information has collected about the
6601 transformations possible in an EBB, compute the appropriate actions
6602 here in compute_ebb_actions. We still must check later to make
6603 sure that the actions do not break any relocations. The algorithm
6604 used here is pretty greedy. Basically, it removes as many no-ops
6605 as possible so that the end of the EBB has the same alignment
6606 characteristics as the original. First, it uses narrowing, then
6607 fill space at the end of the EBB, and finally widenings. If that
6608 does not work, it tries again with one fewer no-op removed. The
6609 optimization will only be performed if all of the branch targets
6610 that were aligned before transformation are also aligned after the
6613 When the size_opt flag is set, ignore the branch target alignments,
6614 narrow all wide instructions, and remove all no-ops unless the end
6615 of the EBB prevents it. */
6618 compute_ebb_actions (ebb_constraint *ebb_table)
6622 int removed_bytes = 0;
6623 ebb_t *ebb = &ebb_table->ebb;
6624 unsigned seg_idx_start = 0;
6625 unsigned seg_idx_end = 0;
6627 /* We perform this like the assembler relaxation algorithm: Start by
6628 assuming all instructions are narrow and all no-ops removed; then
6631 /* For each segment of this that has a solid constraint, check to
6632 see if there are any combinations that will keep the constraint.
6634 for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++)
6636 bfd_boolean requires_text_end_align = FALSE;
6637 unsigned longcall_count = 0;
6638 unsigned longcall_convert_count = 0;
6639 unsigned narrowable_count = 0;
6640 unsigned narrowable_convert_count = 0;
6641 unsigned widenable_count = 0;
6642 unsigned widenable_convert_count = 0;
6644 proposed_action *action = NULL;
6645 int align = (1 << ebb_table->ebb.sec->alignment_power);
6647 seg_idx_start = seg_idx_end;
6649 for (i = seg_idx_start; i < ebb_table->action_count; i++)
6651 action = &ebb_table->actions[i];
6652 if (action->action == ta_convert_longcall)
6654 if (action->action == ta_narrow_insn)
6656 if (action->action == ta_widen_insn)
6658 if (action->action == ta_fill)
6660 if (action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6662 if (action->align_type == EBB_REQUIRE_TGT_ALIGN
6663 && !elf32xtensa_size_opt)
6668 if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable)
6669 requires_text_end_align = TRUE;
6671 if (elf32xtensa_size_opt && !requires_text_end_align
6672 && action->align_type != EBB_REQUIRE_LOOP_ALIGN
6673 && action->align_type != EBB_REQUIRE_TGT_ALIGN)
6675 longcall_convert_count = longcall_count;
6676 narrowable_convert_count = narrowable_count;
6677 widenable_convert_count = 0;
6681 /* There is a constraint. Convert the max number of longcalls. */
6682 narrowable_convert_count = 0;
6683 longcall_convert_count = 0;
6684 widenable_convert_count = 0;
6686 for (j = 0; j < longcall_count; j++)
6688 int removed = (longcall_count - j) * 3 & (align - 1);
6689 unsigned desire_narrow = (align - removed) & (align - 1);
6690 unsigned desire_widen = removed;
6691 if (desire_narrow <= narrowable_count)
6693 narrowable_convert_count = desire_narrow;
6694 narrowable_convert_count +=
6695 (align * ((narrowable_count - narrowable_convert_count)
6697 longcall_convert_count = (longcall_count - j);
6698 widenable_convert_count = 0;
6701 if (desire_widen <= widenable_count && !elf32xtensa_size_opt)
6703 narrowable_convert_count = 0;
6704 longcall_convert_count = longcall_count - j;
6705 widenable_convert_count = desire_widen;
6711 /* Now the number of conversions are saved. Do them. */
6712 for (i = seg_idx_start; i < seg_idx_end; i++)
6714 action = &ebb_table->actions[i];
6715 switch (action->action)
6717 case ta_convert_longcall:
6718 if (longcall_convert_count != 0)
6720 action->action = ta_remove_longcall;
6721 action->do_action = TRUE;
6722 action->removed_bytes += 3;
6723 longcall_convert_count--;
6726 case ta_narrow_insn:
6727 if (narrowable_convert_count != 0)
6729 action->do_action = TRUE;
6730 action->removed_bytes += 1;
6731 narrowable_convert_count--;
6735 if (widenable_convert_count != 0)
6737 action->do_action = TRUE;
6738 action->removed_bytes -= 1;
6739 widenable_convert_count--;
6748 /* Now we move on to some local opts. Try to remove each of the
6749 remaining longcalls. */
6751 if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable)
6754 for (i = 0; i < ebb_table->action_count; i++)
6756 int old_removed_bytes = removed_bytes;
6757 proposed_action *action = &ebb_table->actions[i];
6759 if (action->do_action && action->action == ta_convert_longcall)
6761 bfd_boolean bad_alignment = FALSE;
6763 for (j = i + 1; j < ebb_table->action_count; j++)
6765 proposed_action *new_action = &ebb_table->actions[j];
6766 bfd_vma offset = new_action->offset;
6767 if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN)
6769 if (!check_branch_target_aligned
6770 (ebb_table->ebb.contents,
6771 ebb_table->ebb.content_length,
6772 offset, offset - removed_bytes))
6774 bad_alignment = TRUE;
6778 if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN)
6780 if (!check_loop_aligned (ebb_table->ebb.contents,
6781 ebb_table->ebb.content_length,
6783 offset - removed_bytes))
6785 bad_alignment = TRUE;
6789 if (new_action->action == ta_narrow_insn
6790 && !new_action->do_action
6791 && ebb_table->ebb.sec->alignment_power == 2)
6793 /* Narrow an instruction and we are done. */
6794 new_action->do_action = TRUE;
6795 new_action->removed_bytes += 1;
6796 bad_alignment = FALSE;
6799 if (new_action->action == ta_widen_insn
6800 && new_action->do_action
6801 && ebb_table->ebb.sec->alignment_power == 2)
6803 /* Narrow an instruction and we are done. */
6804 new_action->do_action = FALSE;
6805 new_action->removed_bytes += 1;
6806 bad_alignment = FALSE;
6812 action->removed_bytes += 3;
6813 action->action = ta_remove_longcall;
6814 action->do_action = TRUE;
6817 removed_bytes = old_removed_bytes;
6818 if (action->do_action)
6819 removed_bytes += action->removed_bytes;
6824 for (i = 0; i < ebb_table->action_count; ++i)
6826 proposed_action *action = &ebb_table->actions[i];
6827 if (action->do_action)
6828 removed_bytes += action->removed_bytes;
6831 if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0
6832 && ebb->ends_unreachable)
6834 proposed_action *action;
6838 BFD_ASSERT (ebb_table->action_count != 0);
6839 action = &ebb_table->actions[ebb_table->action_count - 1];
6840 BFD_ASSERT (action->action == ta_fill);
6841 BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE);
6843 extra_space = compute_fill_extra_space (ebb->ends_unreachable);
6844 br = action->removed_bytes + removed_bytes + extra_space;
6845 br = br & ((1 << ebb->sec->alignment_power ) - 1);
6847 action->removed_bytes = extra_space - br;
6853 /* Use check_section_ebb_pcrels_fit to make sure that all of the
6854 relocations in a section will fit if a proposed set of actions
6858 check_section_ebb_pcrels_fit (bfd *abfd,
6861 Elf_Internal_Rela *internal_relocs,
6862 const ebb_constraint *constraint)
6865 Elf_Internal_Rela *irel;
6866 xtensa_relax_info *relax_info;
6868 relax_info = get_xtensa_relax_info (sec);
6870 for (i = 0; i < sec->reloc_count; i++)
6873 bfd_vma orig_self_offset, orig_target_offset;
6874 bfd_vma self_offset, target_offset;
6876 reloc_howto_type *howto;
6877 int self_removed_bytes, target_removed_bytes;
6879 irel = &internal_relocs[i];
6880 r_type = ELF32_R_TYPE (irel->r_info);
6882 howto = &elf_howto_table[r_type];
6883 /* We maintain the required invariant: PC-relative relocations
6884 that fit before linking must fit after linking. Thus we only
6885 need to deal with relocations to the same section that are
6887 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY
6888 || !howto->pc_relative)
6891 r_reloc_init (&r_rel, abfd, irel, contents,
6892 bfd_get_section_limit (abfd, sec));
6894 if (r_reloc_get_section (&r_rel) != sec)
6897 orig_self_offset = irel->r_offset;
6898 orig_target_offset = r_rel.target_offset;
6900 self_offset = orig_self_offset;
6901 target_offset = orig_target_offset;
6905 self_offset = offset_with_removed_text (&relax_info->action_list,
6907 target_offset = offset_with_removed_text (&relax_info->action_list,
6908 orig_target_offset);
6911 self_removed_bytes = 0;
6912 target_removed_bytes = 0;
6914 for (j = 0; j < constraint->action_count; ++j)
6916 proposed_action *action = &constraint->actions[j];
6917 bfd_vma offset = action->offset;
6918 int removed_bytes = action->removed_bytes;
6919 if (offset < orig_self_offset
6920 || (offset == orig_self_offset && action->action == ta_fill
6921 && action->removed_bytes < 0))
6922 self_removed_bytes += removed_bytes;
6923 if (offset < orig_target_offset
6924 || (offset == orig_target_offset && action->action == ta_fill
6925 && action->removed_bytes < 0))
6926 target_removed_bytes += removed_bytes;
6928 self_offset -= self_removed_bytes;
6929 target_offset -= target_removed_bytes;
6931 /* Try to encode it. Get the operand and check. */
6932 if (is_alt_relocation (ELF32_R_TYPE (irel->r_info)))
6934 /* None of the current alternate relocs are PC-relative,
6935 and only PC-relative relocs matter here. */
6939 xtensa_opcode opcode;
6942 opcode = get_relocation_opcode (abfd, sec, contents, irel);
6943 if (opcode == XTENSA_UNDEFINED)
6946 opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info));
6947 if (opnum == XTENSA_UNDEFINED)
6950 if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset))
6960 check_section_ebb_reduces (const ebb_constraint *constraint)
6965 for (i = 0; i < constraint->action_count; i++)
6967 const proposed_action *action = &constraint->actions[i];
6968 if (action->do_action)
6969 removed += action->removed_bytes;
6979 text_action_add_proposed (text_action_list *l,
6980 const ebb_constraint *ebb_table,
6985 for (i = 0; i < ebb_table->action_count; i++)
6987 proposed_action *action = &ebb_table->actions[i];
6989 if (!action->do_action)
6991 switch (action->action)
6993 case ta_remove_insn:
6994 case ta_remove_longcall:
6995 case ta_convert_longcall:
6996 case ta_narrow_insn:
6999 case ta_remove_literal:
7000 text_action_add (l, action->action, sec, action->offset,
7001 action->removed_bytes);
7014 compute_fill_extra_space (property_table_entry *entry)
7016 int fill_extra_space;
7021 if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0)
7024 fill_extra_space = entry->size;
7025 if ((entry->flags & XTENSA_PROP_ALIGN) != 0)
7027 /* Fill bytes for alignment:
7028 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7029 int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags);
7030 int nsm = (1 << pow) - 1;
7031 bfd_vma addr = entry->address + entry->size;
7032 bfd_vma align_fill = nsm - ((addr + nsm) & nsm);
7033 fill_extra_space += align_fill;
7035 return fill_extra_space;
7039 /* First relaxation pass. */
7041 /* If the section contains relaxable literals, check each literal to
7042 see if it has the same value as another literal that has already
7043 been seen, either in the current section or a previous one. If so,
7044 add an entry to the per-section list of removed literals. The
7045 actual changes are deferred until the next pass. */
7048 compute_removed_literals (bfd *abfd,
7050 struct bfd_link_info *link_info,
7051 value_map_hash_table *values)
7053 xtensa_relax_info *relax_info;
7055 Elf_Internal_Rela *internal_relocs;
7056 source_reloc *src_relocs, *rel;
7057 bfd_boolean ok = TRUE;
7058 property_table_entry *prop_table = NULL;
7061 bfd_boolean last_loc_is_prev = FALSE;
7062 bfd_vma last_target_offset = 0;
7063 section_cache_t target_sec_cache;
7064 bfd_size_type sec_size;
7066 init_section_cache (&target_sec_cache);
7068 /* Do nothing if it is not a relaxable literal section. */
7069 relax_info = get_xtensa_relax_info (sec);
7070 BFD_ASSERT (relax_info);
7071 if (!relax_info->is_relaxable_literal_section)
7074 internal_relocs = retrieve_internal_relocs (abfd, sec,
7075 link_info->keep_memory);
7077 sec_size = bfd_get_section_limit (abfd, sec);
7078 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7079 if (contents == NULL && sec_size != 0)
7085 /* Sort the source_relocs by target offset. */
7086 src_relocs = relax_info->src_relocs;
7087 qsort (src_relocs, relax_info->src_count,
7088 sizeof (source_reloc), source_reloc_compare);
7089 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
7090 internal_reloc_compare);
7092 ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table,
7093 XTENSA_PROP_SEC_NAME, FALSE);
7101 for (i = 0; i < relax_info->src_count; i++)
7103 Elf_Internal_Rela *irel = NULL;
7105 rel = &src_relocs[i];
7106 if (get_l32r_opcode () != rel->opcode)
7108 irel = get_irel_at_offset (sec, internal_relocs,
7109 rel->r_rel.target_offset);
7111 /* If the relocation on this is not a simple R_XTENSA_32 or
7112 R_XTENSA_PLT then do not consider it. This may happen when
7113 the difference of two symbols is used in a literal. */
7114 if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32
7115 && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT))
7118 /* If the target_offset for this relocation is the same as the
7119 previous relocation, then we've already considered whether the
7120 literal can be coalesced. Skip to the next one.... */
7121 if (i != 0 && prev_i != -1
7122 && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset)
7126 if (last_loc_is_prev &&
7127 last_target_offset + 4 != rel->r_rel.target_offset)
7128 last_loc_is_prev = FALSE;
7130 /* Check if the relocation was from an L32R that is being removed
7131 because a CALLX was converted to a direct CALL, and check if
7132 there are no other relocations to the literal. */
7133 if (is_removable_literal (rel, i, src_relocs, relax_info->src_count))
7135 if (!remove_dead_literal (abfd, sec, link_info, internal_relocs,
7136 irel, rel, prop_table, ptblsize))
7141 last_target_offset = rel->r_rel.target_offset;
7145 if (!identify_literal_placement (abfd, sec, contents, link_info,
7147 &last_loc_is_prev, irel,
7148 relax_info->src_count - i, rel,
7149 prop_table, ptblsize,
7150 &target_sec_cache, rel->is_abs_literal))
7155 last_target_offset = rel->r_rel.target_offset;
7159 print_removed_literals (stderr, &relax_info->removed_list);
7160 print_action_list (stderr, &relax_info->action_list);
7164 if (prop_table) free (prop_table);
7165 clear_section_cache (&target_sec_cache);
7167 release_contents (sec, contents);
7168 release_internal_relocs (sec, internal_relocs);
7173 static Elf_Internal_Rela *
7174 get_irel_at_offset (asection *sec,
7175 Elf_Internal_Rela *internal_relocs,
7179 Elf_Internal_Rela *irel;
7181 Elf_Internal_Rela key;
7183 if (!internal_relocs)
7186 key.r_offset = offset;
7187 irel = bsearch (&key, internal_relocs, sec->reloc_count,
7188 sizeof (Elf_Internal_Rela), internal_reloc_matches);
7192 /* bsearch does not guarantee which will be returned if there are
7193 multiple matches. We need the first that is not an alignment. */
7194 i = irel - internal_relocs;
7197 if (internal_relocs[i-1].r_offset != offset)
7201 for ( ; i < sec->reloc_count; i++)
7203 irel = &internal_relocs[i];
7204 r_type = ELF32_R_TYPE (irel->r_info);
7205 if (irel->r_offset == offset && r_type != R_XTENSA_NONE)
7214 is_removable_literal (const source_reloc *rel,
7216 const source_reloc *src_relocs,
7219 const source_reloc *curr_rel;
7223 for (++i; i < src_count; ++i)
7225 curr_rel = &src_relocs[i];
7226 /* If all others have the same target offset.... */
7227 if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset)
7230 if (!curr_rel->is_null
7231 && !xtensa_is_property_section (curr_rel->source_sec)
7232 && !(curr_rel->source_sec->flags & SEC_DEBUGGING))
7240 remove_dead_literal (bfd *abfd,
7242 struct bfd_link_info *link_info,
7243 Elf_Internal_Rela *internal_relocs,
7244 Elf_Internal_Rela *irel,
7246 property_table_entry *prop_table,
7249 property_table_entry *entry;
7250 xtensa_relax_info *relax_info;
7252 relax_info = get_xtensa_relax_info (sec);
7256 entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7257 sec->vma + rel->r_rel.target_offset);
7259 /* Mark the unused literal so that it will be removed. */
7260 add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL);
7262 text_action_add (&relax_info->action_list,
7263 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7265 /* If the section is 4-byte aligned, do not add fill. */
7266 if (sec->alignment_power > 2)
7268 int fill_extra_space;
7269 bfd_vma entry_sec_offset;
7271 property_table_entry *the_add_entry;
7275 entry_sec_offset = entry->address - sec->vma + entry->size;
7277 entry_sec_offset = rel->r_rel.target_offset + 4;
7279 /* If the literal range is at the end of the section,
7281 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7283 fill_extra_space = compute_fill_extra_space (the_add_entry);
7285 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7286 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7287 -4, fill_extra_space);
7289 adjust_fill_action (fa, removed_diff);
7291 text_action_add (&relax_info->action_list,
7292 ta_fill, sec, entry_sec_offset, removed_diff);
7295 /* Zero out the relocation on this literal location. */
7298 if (elf_hash_table (link_info)->dynamic_sections_created)
7299 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7301 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7302 pin_internal_relocs (sec, internal_relocs);
7305 /* Do not modify "last_loc_is_prev". */
7311 identify_literal_placement (bfd *abfd,
7314 struct bfd_link_info *link_info,
7315 value_map_hash_table *values,
7316 bfd_boolean *last_loc_is_prev_p,
7317 Elf_Internal_Rela *irel,
7318 int remaining_src_rels,
7320 property_table_entry *prop_table,
7322 section_cache_t *target_sec_cache,
7323 bfd_boolean is_abs_literal)
7327 xtensa_relax_info *relax_info;
7328 bfd_boolean literal_placed = FALSE;
7330 unsigned long value;
7331 bfd_boolean final_static_link;
7332 bfd_size_type sec_size;
7334 relax_info = get_xtensa_relax_info (sec);
7338 sec_size = bfd_get_section_limit (abfd, sec);
7341 (!link_info->relocatable
7342 && !elf_hash_table (link_info)->dynamic_sections_created);
7344 /* The placement algorithm first checks to see if the literal is
7345 already in the value map. If so and the value map is reachable
7346 from all uses, then the literal is moved to that location. If
7347 not, then we identify the last location where a fresh literal was
7348 placed. If the literal can be safely moved there, then we do so.
7349 If not, then we assume that the literal is not to move and leave
7350 the literal where it is, marking it as the last literal
7353 /* Find the literal value. */
7355 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7358 BFD_ASSERT (rel->r_rel.target_offset < sec_size);
7359 value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset);
7361 init_literal_value (&val, &r_rel, value, is_abs_literal);
7363 /* Check if we've seen another literal with the same value that
7364 is in the same output section. */
7365 val_map = value_map_get_cached_value (values, &val, final_static_link);
7368 && (r_reloc_get_section (&val_map->loc)->output_section
7369 == sec->output_section)
7370 && relocations_reach (rel, remaining_src_rels, &val_map->loc)
7371 && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map))
7373 /* No change to last_loc_is_prev. */
7374 literal_placed = TRUE;
7377 /* For relocatable links, do not try to move literals. To do it
7378 correctly might increase the number of relocations in an input
7379 section making the default relocatable linking fail. */
7380 if (!link_info->relocatable && !literal_placed
7381 && values->has_last_loc && !(*last_loc_is_prev_p))
7383 asection *target_sec = r_reloc_get_section (&values->last_loc);
7384 if (target_sec && target_sec->output_section == sec->output_section)
7386 /* Increment the virtual offset. */
7387 r_reloc try_loc = values->last_loc;
7388 try_loc.virtual_offset += 4;
7390 /* There is a last loc that was in the same output section. */
7391 if (relocations_reach (rel, remaining_src_rels, &try_loc)
7392 && move_shared_literal (sec, link_info, rel,
7393 prop_table, ptblsize,
7394 &try_loc, &val, target_sec_cache))
7396 values->last_loc.virtual_offset += 4;
7397 literal_placed = TRUE;
7399 val_map = add_value_map (values, &val, &try_loc,
7402 val_map->loc = try_loc;
7407 if (!literal_placed)
7409 /* Nothing worked, leave the literal alone but update the last loc. */
7410 values->has_last_loc = TRUE;
7411 values->last_loc = rel->r_rel;
7413 val_map = add_value_map (values, &val, &rel->r_rel, final_static_link);
7415 val_map->loc = rel->r_rel;
7416 *last_loc_is_prev_p = TRUE;
7423 /* Check if the original relocations (presumably on L32R instructions)
7424 identified by reloc[0..N] can be changed to reference the literal
7425 identified by r_rel. If r_rel is out of range for any of the
7426 original relocations, then we don't want to coalesce the original
7427 literal with the one at r_rel. We only check reloc[0..N], where the
7428 offsets are all the same as for reloc[0] (i.e., they're all
7429 referencing the same literal) and where N is also bounded by the
7430 number of remaining entries in the "reloc" array. The "reloc" array
7431 is sorted by target offset so we know all the entries for the same
7432 literal will be contiguous. */
7435 relocations_reach (source_reloc *reloc,
7436 int remaining_relocs,
7437 const r_reloc *r_rel)
7439 bfd_vma from_offset, source_address, dest_address;
7443 if (!r_reloc_is_defined (r_rel))
7446 sec = r_reloc_get_section (r_rel);
7447 from_offset = reloc[0].r_rel.target_offset;
7449 for (i = 0; i < remaining_relocs; i++)
7451 if (reloc[i].r_rel.target_offset != from_offset)
7454 /* Ignore relocations that have been removed. */
7455 if (reloc[i].is_null)
7458 /* The original and new output section for these must be the same
7459 in order to coalesce. */
7460 if (r_reloc_get_section (&reloc[i].r_rel)->output_section
7461 != sec->output_section)
7464 /* A literal with no PC-relative relocations can be moved anywhere. */
7465 if (reloc[i].opnd != -1)
7467 /* Otherwise, check to see that it fits. */
7468 source_address = (reloc[i].source_sec->output_section->vma
7469 + reloc[i].source_sec->output_offset
7470 + reloc[i].r_rel.rela.r_offset);
7471 dest_address = (sec->output_section->vma
7472 + sec->output_offset
7473 + r_rel->target_offset);
7475 if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd,
7476 source_address, dest_address))
7485 /* Move a literal to another literal location because it is
7486 the same as the other literal value. */
7489 coalesce_shared_literal (asection *sec,
7491 property_table_entry *prop_table,
7495 property_table_entry *entry;
7497 property_table_entry *the_add_entry;
7499 xtensa_relax_info *relax_info;
7501 relax_info = get_xtensa_relax_info (sec);
7505 entry = elf_xtensa_find_property_entry
7506 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7507 if (entry && (entry->flags & XTENSA_PROP_INSN_NO_TRANSFORM))
7510 /* Mark that the literal will be coalesced. */
7511 add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc);
7513 text_action_add (&relax_info->action_list,
7514 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7516 /* If the section is 4-byte aligned, do not add fill. */
7517 if (sec->alignment_power > 2)
7519 int fill_extra_space;
7520 bfd_vma entry_sec_offset;
7523 entry_sec_offset = entry->address - sec->vma + entry->size;
7525 entry_sec_offset = rel->r_rel.target_offset + 4;
7527 /* If the literal range is at the end of the section,
7529 fill_extra_space = 0;
7530 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7532 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7533 fill_extra_space = the_add_entry->size;
7535 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7536 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7537 -4, fill_extra_space);
7539 adjust_fill_action (fa, removed_diff);
7541 text_action_add (&relax_info->action_list,
7542 ta_fill, sec, entry_sec_offset, removed_diff);
7549 /* Move a literal to another location. This may actually increase the
7550 total amount of space used because of alignments so we need to do
7551 this carefully. Also, it may make a branch go out of range. */
7554 move_shared_literal (asection *sec,
7555 struct bfd_link_info *link_info,
7557 property_table_entry *prop_table,
7559 const r_reloc *target_loc,
7560 const literal_value *lit_value,
7561 section_cache_t *target_sec_cache)
7563 property_table_entry *the_add_entry, *src_entry, *target_entry = NULL;
7564 text_action *fa, *target_fa;
7566 xtensa_relax_info *relax_info, *target_relax_info;
7567 asection *target_sec;
7569 ebb_constraint ebb_table;
7570 bfd_boolean relocs_fit;
7572 /* If this routine always returns FALSE, the literals that cannot be
7573 coalesced will not be moved. */
7574 if (elf32xtensa_no_literal_movement)
7577 relax_info = get_xtensa_relax_info (sec);
7581 target_sec = r_reloc_get_section (target_loc);
7582 target_relax_info = get_xtensa_relax_info (target_sec);
7584 /* Literals to undefined sections may not be moved because they
7585 must report an error. */
7586 if (bfd_is_und_section (target_sec))
7589 src_entry = elf_xtensa_find_property_entry
7590 (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset);
7592 if (!section_cache_section (target_sec_cache, target_sec, link_info))
7595 target_entry = elf_xtensa_find_property_entry
7596 (target_sec_cache->ptbl, target_sec_cache->pte_count,
7597 target_sec->vma + target_loc->target_offset);
7602 /* Make sure that we have not broken any branches. */
7605 init_ebb_constraint (&ebb_table);
7606 ebb = &ebb_table.ebb;
7607 init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents,
7608 target_sec_cache->content_length,
7609 target_sec_cache->ptbl, target_sec_cache->pte_count,
7610 target_sec_cache->relocs, target_sec_cache->reloc_count);
7612 /* Propose to add 4 bytes + worst-case alignment size increase to
7614 ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0,
7615 ta_fill, target_loc->target_offset,
7616 -4 - (1 << target_sec->alignment_power), TRUE);
7618 /* Check all of the PC-relative relocations to make sure they still fit. */
7619 relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec,
7620 target_sec_cache->contents,
7621 target_sec_cache->relocs,
7627 text_action_add_literal (&target_relax_info->action_list,
7628 ta_add_literal, target_loc, lit_value, -4);
7630 if (target_sec->alignment_power > 2 && target_entry != src_entry)
7632 /* May need to add or remove some fill to maintain alignment. */
7633 int fill_extra_space;
7634 bfd_vma entry_sec_offset;
7637 target_entry->address - target_sec->vma + target_entry->size;
7639 /* If the literal range is at the end of the section,
7641 fill_extra_space = 0;
7643 elf_xtensa_find_property_entry (target_sec_cache->ptbl,
7644 target_sec_cache->pte_count,
7646 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7647 fill_extra_space = the_add_entry->size;
7649 target_fa = find_fill_action (&target_relax_info->action_list,
7650 target_sec, entry_sec_offset);
7651 removed_diff = compute_removed_action_diff (target_fa, target_sec,
7652 entry_sec_offset, 4,
7655 adjust_fill_action (target_fa, removed_diff);
7657 text_action_add (&target_relax_info->action_list,
7658 ta_fill, target_sec, entry_sec_offset, removed_diff);
7661 /* Mark that the literal will be moved to the new location. */
7662 add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc);
7664 /* Remove the literal. */
7665 text_action_add (&relax_info->action_list,
7666 ta_remove_literal, sec, rel->r_rel.target_offset, 4);
7668 /* If the section is 4-byte aligned, do not add fill. */
7669 if (sec->alignment_power > 2 && target_entry != src_entry)
7671 int fill_extra_space;
7672 bfd_vma entry_sec_offset;
7675 entry_sec_offset = src_entry->address - sec->vma + src_entry->size;
7677 entry_sec_offset = rel->r_rel.target_offset+4;
7679 /* If the literal range is at the end of the section,
7681 fill_extra_space = 0;
7682 the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize,
7684 if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE))
7685 fill_extra_space = the_add_entry->size;
7687 fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset);
7688 removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset,
7689 -4, fill_extra_space);
7691 adjust_fill_action (fa, removed_diff);
7693 text_action_add (&relax_info->action_list,
7694 ta_fill, sec, entry_sec_offset, removed_diff);
7701 /* Second relaxation pass. */
7703 /* Modify all of the relocations to point to the right spot, and if this
7704 is a relaxable section, delete the unwanted literals and fix the
7708 relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
7710 Elf_Internal_Rela *internal_relocs;
7711 xtensa_relax_info *relax_info;
7713 bfd_boolean ok = TRUE;
7715 bfd_boolean rv = FALSE;
7716 bfd_boolean virtual_action;
7717 bfd_size_type sec_size;
7719 sec_size = bfd_get_section_limit (abfd, sec);
7720 relax_info = get_xtensa_relax_info (sec);
7721 BFD_ASSERT (relax_info);
7723 /* First translate any of the fixes that have been added already. */
7724 translate_section_fixes (sec);
7726 /* Handle property sections (e.g., literal tables) specially. */
7727 if (xtensa_is_property_section (sec))
7729 BFD_ASSERT (!relax_info->is_relaxable_literal_section);
7730 return relax_property_section (abfd, sec, link_info);
7733 internal_relocs = retrieve_internal_relocs (abfd, sec,
7734 link_info->keep_memory);
7735 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
7736 if (contents == NULL && sec_size != 0)
7742 if (internal_relocs)
7744 for (i = 0; i < sec->reloc_count; i++)
7746 Elf_Internal_Rela *irel;
7747 xtensa_relax_info *target_relax_info;
7748 bfd_vma source_offset, old_source_offset;
7751 asection *target_sec;
7753 /* Locally change the source address.
7754 Translate the target to the new target address.
7755 If it points to this section and has been removed,
7759 irel = &internal_relocs[i];
7760 source_offset = irel->r_offset;
7761 old_source_offset = source_offset;
7763 r_type = ELF32_R_TYPE (irel->r_info);
7764 r_reloc_init (&r_rel, abfd, irel, contents,
7765 bfd_get_section_limit (abfd, sec));
7767 /* If this section could have changed then we may need to
7768 change the relocation's offset. */
7770 if (relax_info->is_relaxable_literal_section
7771 || relax_info->is_relaxable_asm_section)
7773 if (r_type != R_XTENSA_NONE
7774 && find_removed_literal (&relax_info->removed_list,
7777 /* Remove this relocation. */
7778 if (elf_hash_table (link_info)->dynamic_sections_created)
7779 shrink_dynamic_reloc_sections (link_info, abfd, sec, irel);
7780 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
7781 irel->r_offset = offset_with_removed_text
7782 (&relax_info->action_list, irel->r_offset);
7783 pin_internal_relocs (sec, internal_relocs);
7787 if (r_type == R_XTENSA_ASM_SIMPLIFY)
7789 text_action *action =
7790 find_insn_action (&relax_info->action_list,
7792 if (action && (action->action == ta_convert_longcall
7793 || action->action == ta_remove_longcall))
7795 bfd_reloc_status_type retval;
7796 char *error_message = NULL;
7798 retval = contract_asm_expansion (contents, sec_size,
7799 irel, &error_message);
7800 if (retval != bfd_reloc_ok)
7802 (*link_info->callbacks->reloc_dangerous)
7803 (link_info, error_message, abfd, sec,
7807 /* Update the action so that the code that moves
7808 the contents will do the right thing. */
7809 if (action->action == ta_remove_longcall)
7810 action->action = ta_remove_insn;
7812 action->action = ta_none;
7813 /* Refresh the info in the r_rel. */
7814 r_reloc_init (&r_rel, abfd, irel, contents, sec_size);
7815 r_type = ELF32_R_TYPE (irel->r_info);
7819 source_offset = offset_with_removed_text
7820 (&relax_info->action_list, irel->r_offset);
7821 irel->r_offset = source_offset;
7824 /* If the target section could have changed then
7825 we may need to change the relocation's target offset. */
7827 target_sec = r_reloc_get_section (&r_rel);
7828 target_relax_info = get_xtensa_relax_info (target_sec);
7830 if (target_relax_info
7831 && (target_relax_info->is_relaxable_literal_section
7832 || target_relax_info->is_relaxable_asm_section))
7836 bfd_vma addend_displacement;
7838 translate_reloc (&r_rel, &new_reloc);
7840 if (r_type == R_XTENSA_DIFF8
7841 || r_type == R_XTENSA_DIFF16
7842 || r_type == R_XTENSA_DIFF32)
7844 bfd_vma diff_value = 0, new_end_offset, diff_mask = 0;
7846 if (bfd_get_section_limit (abfd, sec) < old_source_offset)
7848 (*link_info->callbacks->reloc_dangerous)
7849 (link_info, _("invalid relocation address"),
7850 abfd, sec, old_source_offset);
7856 case R_XTENSA_DIFF8:
7858 bfd_get_8 (abfd, &contents[old_source_offset]);
7860 case R_XTENSA_DIFF16:
7862 bfd_get_16 (abfd, &contents[old_source_offset]);
7864 case R_XTENSA_DIFF32:
7866 bfd_get_32 (abfd, &contents[old_source_offset]);
7870 new_end_offset = offset_with_removed_text
7871 (&target_relax_info->action_list,
7872 r_rel.target_offset + diff_value);
7873 diff_value = new_end_offset - new_reloc.target_offset;
7877 case R_XTENSA_DIFF8:
7879 bfd_put_8 (abfd, diff_value,
7880 &contents[old_source_offset]);
7882 case R_XTENSA_DIFF16:
7884 bfd_put_16 (abfd, diff_value,
7885 &contents[old_source_offset]);
7887 case R_XTENSA_DIFF32:
7888 diff_mask = 0xffffffff;
7889 bfd_put_32 (abfd, diff_value,
7890 &contents[old_source_offset]);
7894 /* Check for overflow. */
7895 if ((diff_value & ~diff_mask) != 0)
7897 (*link_info->callbacks->reloc_dangerous)
7898 (link_info, _("overflow after relaxation"),
7899 abfd, sec, old_source_offset);
7903 pin_contents (sec, contents);
7906 /* FIXME: If the relocation still references a section in
7907 the same input file, the relocation should be modified
7908 directly instead of adding a "fix" record. */
7910 addend_displacement =
7911 new_reloc.target_offset + new_reloc.virtual_offset;
7913 fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0,
7914 r_reloc_get_section (&new_reloc),
7915 addend_displacement, TRUE);
7919 pin_internal_relocs (sec, internal_relocs);
7923 if ((relax_info->is_relaxable_literal_section
7924 || relax_info->is_relaxable_asm_section)
7925 && relax_info->action_list.head)
7927 /* Walk through the planned actions and build up a table
7928 of move, copy and fill records. Use the move, copy and
7929 fill records to perform the actions once. */
7931 bfd_size_type size = sec->size;
7933 bfd_size_type final_size, copy_size, orig_insn_size;
7934 bfd_byte *scratch = NULL;
7935 bfd_byte *dup_contents = NULL;
7936 bfd_size_type orig_size = size;
7937 bfd_vma orig_dot = 0;
7938 bfd_vma orig_dot_copied = 0; /* Byte copied already from
7939 orig dot in physical memory. */
7940 bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */
7941 bfd_vma dup_dot = 0;
7943 text_action *action = relax_info->action_list.head;
7945 final_size = sec->size;
7946 for (action = relax_info->action_list.head; action;
7947 action = action->next)
7949 final_size -= action->removed_bytes;
7952 scratch = (bfd_byte *) bfd_zmalloc (final_size);
7953 dup_contents = (bfd_byte *) bfd_zmalloc (final_size);
7955 /* The dot is the current fill location. */
7957 print_action_list (stderr, &relax_info->action_list);
7960 for (action = relax_info->action_list.head; action;
7961 action = action->next)
7963 virtual_action = FALSE;
7964 if (action->offset > orig_dot)
7966 orig_dot += orig_dot_copied;
7967 orig_dot_copied = 0;
7969 /* Out of the virtual world. */
7972 if (action->offset > orig_dot)
7974 copy_size = action->offset - orig_dot;
7975 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
7976 orig_dot += copy_size;
7977 dup_dot += copy_size;
7978 BFD_ASSERT (action->offset == orig_dot);
7980 else if (action->offset < orig_dot)
7982 if (action->action == ta_fill
7983 && action->offset - action->removed_bytes == orig_dot)
7985 /* This is OK because the fill only effects the dup_dot. */
7987 else if (action->action == ta_add_literal)
7989 /* TBD. Might need to handle this. */
7992 if (action->offset == orig_dot)
7994 if (action->virtual_offset > orig_dot_vo)
7996 if (orig_dot_vo == 0)
7998 /* Need to copy virtual_offset bytes. Probably four. */
7999 copy_size = action->virtual_offset - orig_dot_vo;
8000 memmove (&dup_contents[dup_dot],
8001 &contents[orig_dot], copy_size);
8002 orig_dot_copied = copy_size;
8003 dup_dot += copy_size;
8005 virtual_action = TRUE;
8008 BFD_ASSERT (action->virtual_offset <= orig_dot_vo);
8010 switch (action->action)
8012 case ta_remove_literal:
8013 case ta_remove_insn:
8014 BFD_ASSERT (action->removed_bytes >= 0);
8015 orig_dot += action->removed_bytes;
8018 case ta_narrow_insn:
8021 memmove (scratch, &contents[orig_dot], orig_insn_size);
8022 BFD_ASSERT (action->removed_bytes == 1);
8023 rv = narrow_instruction (scratch, final_size, 0, TRUE);
8025 memmove (&dup_contents[dup_dot], scratch, copy_size);
8026 orig_dot += orig_insn_size;
8027 dup_dot += copy_size;
8031 if (action->removed_bytes >= 0)
8032 orig_dot += action->removed_bytes;
8035 /* Already zeroed in dup_contents. Just bump the
8037 dup_dot += (-action->removed_bytes);
8042 BFD_ASSERT (action->removed_bytes == 0);
8045 case ta_convert_longcall:
8046 case ta_remove_longcall:
8047 /* These will be removed or converted before we get here. */
8054 memmove (scratch, &contents[orig_dot], orig_insn_size);
8055 BFD_ASSERT (action->removed_bytes == -1);
8056 rv = widen_instruction (scratch, final_size, 0, TRUE);
8058 memmove (&dup_contents[dup_dot], scratch, copy_size);
8059 orig_dot += orig_insn_size;
8060 dup_dot += copy_size;
8063 case ta_add_literal:
8066 BFD_ASSERT (action->removed_bytes == -4);
8067 /* TBD -- place the literal value here and insert
8069 memset (&dup_contents[dup_dot], 0, 4);
8070 pin_internal_relocs (sec, internal_relocs);
8071 pin_contents (sec, contents);
8073 if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents,
8074 relax_info, &internal_relocs, &action->value))
8078 orig_dot_vo += copy_size;
8080 orig_dot += orig_insn_size;
8081 dup_dot += copy_size;
8085 /* Not implemented yet. */
8090 size -= action->removed_bytes;
8091 removed += action->removed_bytes;
8092 BFD_ASSERT (dup_dot <= final_size);
8093 BFD_ASSERT (orig_dot <= orig_size);
8096 orig_dot += orig_dot_copied;
8097 orig_dot_copied = 0;
8099 if (orig_dot != orig_size)
8101 copy_size = orig_size - orig_dot;
8102 BFD_ASSERT (orig_size > orig_dot);
8103 BFD_ASSERT (dup_dot + copy_size == final_size);
8104 memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size);
8105 orig_dot += copy_size;
8106 dup_dot += copy_size;
8108 BFD_ASSERT (orig_size == orig_dot);
8109 BFD_ASSERT (final_size == dup_dot);
8111 /* Move the dup_contents back. */
8112 if (final_size > orig_size)
8114 /* Contents need to be reallocated. Swap the dup_contents into
8116 sec->contents = dup_contents;
8118 contents = dup_contents;
8119 pin_contents (sec, contents);
8123 BFD_ASSERT (final_size <= orig_size);
8124 memset (contents, 0, orig_size);
8125 memcpy (contents, dup_contents, final_size);
8126 free (dup_contents);
8129 pin_contents (sec, contents);
8131 sec->size = final_size;
8135 release_internal_relocs (sec, internal_relocs);
8136 release_contents (sec, contents);
8142 translate_section_fixes (asection *sec)
8144 xtensa_relax_info *relax_info;
8147 relax_info = get_xtensa_relax_info (sec);
8151 for (r = relax_info->fix_list; r != NULL; r = r->next)
8152 if (!translate_reloc_bfd_fix (r))
8159 /* Translate a fix given the mapping in the relax info for the target
8160 section. If it has already been translated, no work is required. */
8163 translate_reloc_bfd_fix (reloc_bfd_fix *fix)
8165 reloc_bfd_fix new_fix;
8167 xtensa_relax_info *relax_info;
8168 removed_literal *removed;
8169 bfd_vma new_offset, target_offset;
8171 if (fix->translated)
8174 sec = fix->target_sec;
8175 target_offset = fix->target_offset;
8177 relax_info = get_xtensa_relax_info (sec);
8180 fix->translated = TRUE;
8186 /* The fix does not need to be translated if the section cannot change. */
8187 if (!relax_info->is_relaxable_literal_section
8188 && !relax_info->is_relaxable_asm_section)
8190 fix->translated = TRUE;
8194 /* If the literal has been moved and this relocation was on an
8195 opcode, then the relocation should move to the new literal
8196 location. Otherwise, the relocation should move within the
8200 if (is_operand_relocation (fix->src_type))
8202 /* Check if the original relocation is against a literal being
8204 removed = find_removed_literal (&relax_info->removed_list,
8212 /* The fact that there is still a relocation to this literal indicates
8213 that the literal is being coalesced, not simply removed. */
8214 BFD_ASSERT (removed->to.abfd != NULL);
8216 /* This was moved to some other address (possibly another section). */
8217 new_sec = r_reloc_get_section (&removed->to);
8221 relax_info = get_xtensa_relax_info (sec);
8223 (!relax_info->is_relaxable_literal_section
8224 && !relax_info->is_relaxable_asm_section))
8226 target_offset = removed->to.target_offset;
8227 new_fix.target_sec = new_sec;
8228 new_fix.target_offset = target_offset;
8229 new_fix.translated = TRUE;
8234 target_offset = removed->to.target_offset;
8235 new_fix.target_sec = new_sec;
8238 /* The target address may have been moved within its section. */
8239 new_offset = offset_with_removed_text (&relax_info->action_list,
8242 new_fix.target_offset = new_offset;
8243 new_fix.target_offset = new_offset;
8244 new_fix.translated = TRUE;
8250 /* Fix up a relocation to take account of removed literals. */
8253 translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel)
8256 xtensa_relax_info *relax_info;
8257 removed_literal *removed;
8258 bfd_vma new_offset, target_offset, removed_bytes;
8260 *new_rel = *orig_rel;
8262 if (!r_reloc_is_defined (orig_rel))
8264 sec = r_reloc_get_section (orig_rel);
8266 relax_info = get_xtensa_relax_info (sec);
8267 BFD_ASSERT (relax_info);
8269 if (!relax_info->is_relaxable_literal_section
8270 && !relax_info->is_relaxable_asm_section)
8273 target_offset = orig_rel->target_offset;
8276 if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
8278 /* Check if the original relocation is against a literal being
8280 removed = find_removed_literal (&relax_info->removed_list,
8283 if (removed && removed->to.abfd)
8287 /* The fact that there is still a relocation to this literal indicates
8288 that the literal is being coalesced, not simply removed. */
8289 BFD_ASSERT (removed->to.abfd != NULL);
8291 /* This was moved to some other address
8292 (possibly in another section). */
8293 *new_rel = removed->to;
8294 new_sec = r_reloc_get_section (new_rel);
8298 relax_info = get_xtensa_relax_info (sec);
8300 || (!relax_info->is_relaxable_literal_section
8301 && !relax_info->is_relaxable_asm_section))
8304 target_offset = new_rel->target_offset;
8307 /* ...and the target address may have been moved within its section. */
8308 new_offset = offset_with_removed_text (&relax_info->action_list,
8311 /* Modify the offset and addend. */
8312 removed_bytes = target_offset - new_offset;
8313 new_rel->target_offset = new_offset;
8314 new_rel->rela.r_addend -= removed_bytes;
8318 /* For dynamic links, there may be a dynamic relocation for each
8319 literal. The number of dynamic relocations must be computed in
8320 size_dynamic_sections, which occurs before relaxation. When a
8321 literal is removed, this function checks if there is a corresponding
8322 dynamic relocation and shrinks the size of the appropriate dynamic
8323 relocation section accordingly. At this point, the contents of the
8324 dynamic relocation sections have not yet been filled in, so there's
8325 nothing else that needs to be done. */
8328 shrink_dynamic_reloc_sections (struct bfd_link_info *info,
8330 asection *input_section,
8331 Elf_Internal_Rela *rel)
8333 Elf_Internal_Shdr *symtab_hdr;
8334 struct elf_link_hash_entry **sym_hashes;
8335 unsigned long r_symndx;
8337 struct elf_link_hash_entry *h;
8338 bfd_boolean dynamic_symbol;
8340 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8341 sym_hashes = elf_sym_hashes (abfd);
8343 r_type = ELF32_R_TYPE (rel->r_info);
8344 r_symndx = ELF32_R_SYM (rel->r_info);
8346 if (r_symndx < symtab_hdr->sh_info)
8349 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
8351 dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info);
8353 if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT)
8354 && (input_section->flags & SEC_ALLOC) != 0
8355 && (dynamic_symbol || info->shared))
8358 const char *srel_name;
8360 bfd_boolean is_plt = FALSE;
8362 dynobj = elf_hash_table (info)->dynobj;
8363 BFD_ASSERT (dynobj != NULL);
8365 if (dynamic_symbol && r_type == R_XTENSA_PLT)
8367 srel_name = ".rela.plt";
8371 srel_name = ".rela.got";
8373 /* Reduce size of the .rela.* section by one reloc. */
8374 srel = bfd_get_section_by_name (dynobj, srel_name);
8375 BFD_ASSERT (srel != NULL);
8376 BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela));
8377 srel->size -= sizeof (Elf32_External_Rela);
8381 asection *splt, *sgotplt, *srelgot;
8382 int reloc_index, chunk;
8384 /* Find the PLT reloc index of the entry being removed. This
8385 is computed from the size of ".rela.plt". It is needed to
8386 figure out which PLT chunk to resize. Usually "last index
8387 = size - 1" since the index starts at zero, but in this
8388 context, the size has just been decremented so there's no
8389 need to subtract one. */
8390 reloc_index = srel->size / sizeof (Elf32_External_Rela);
8392 chunk = reloc_index / PLT_ENTRIES_PER_CHUNK;
8393 splt = elf_xtensa_get_plt_section (dynobj, chunk);
8394 sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk);
8395 BFD_ASSERT (splt != NULL && sgotplt != NULL);
8397 /* Check if an entire PLT chunk has just been eliminated. */
8398 if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0)
8400 /* The two magic GOT entries for that chunk can go away. */
8401 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
8402 BFD_ASSERT (srelgot != NULL);
8403 srelgot->reloc_count -= 2;
8404 srelgot->size -= 2 * sizeof (Elf32_External_Rela);
8407 /* There should be only one entry left (and it will be
8409 BFD_ASSERT (sgotplt->size == 4);
8410 BFD_ASSERT (splt->size == PLT_ENTRY_SIZE);
8413 BFD_ASSERT (sgotplt->size >= 4);
8414 BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE);
8417 splt->size -= PLT_ENTRY_SIZE;
8423 /* Take an r_rel and move it to another section. This usually
8424 requires extending the interal_relocation array and pinning it. If
8425 the original r_rel is from the same BFD, we can complete this here.
8426 Otherwise, we add a fix record to let the final link fix the
8427 appropriate address. Contents and internal relocations for the
8428 section must be pinned after calling this routine. */
8431 move_literal (bfd *abfd,
8432 struct bfd_link_info *link_info,
8436 xtensa_relax_info *relax_info,
8437 Elf_Internal_Rela **internal_relocs_p,
8438 const literal_value *lit)
8440 Elf_Internal_Rela *new_relocs = NULL;
8441 size_t new_relocs_count = 0;
8442 Elf_Internal_Rela this_rela;
8443 const r_reloc *r_rel;
8445 r_rel = &lit->r_rel;
8446 BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p);
8448 if (r_reloc_is_const (r_rel))
8449 bfd_put_32 (abfd, lit->value, contents + offset);
8454 asection *target_sec;
8458 r_type = ELF32_R_TYPE (r_rel->rela.r_info);
8459 target_sec = r_reloc_get_section (r_rel);
8461 /* This is the difficult case. We have to create a fix up. */
8462 this_rela.r_offset = offset;
8463 this_rela.r_info = ELF32_R_INFO (0, r_type);
8464 this_rela.r_addend =
8465 r_rel->target_offset - r_reloc_get_target_offset (r_rel);
8466 bfd_put_32 (abfd, lit->value, contents + offset);
8468 /* Currently, we cannot move relocations during a relocatable link. */
8469 BFD_ASSERT (!link_info->relocatable);
8470 fix = reloc_bfd_fix_init (sec, offset, r_type, r_rel->abfd,
8471 r_reloc_get_section (r_rel),
8472 r_rel->target_offset + r_rel->virtual_offset,
8474 /* We also need to mark that relocations are needed here. */
8475 sec->flags |= SEC_RELOC;
8477 translate_reloc_bfd_fix (fix);
8478 /* This fix has not yet been translated. */
8481 /* Add the relocation. If we have already allocated our own
8482 space for the relocations and we have room for more, then use
8483 it. Otherwise, allocate new space and move the literals. */
8484 insert_at = sec->reloc_count;
8485 for (i = 0; i < sec->reloc_count; ++i)
8487 if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset)
8494 if (*internal_relocs_p != relax_info->allocated_relocs
8495 || sec->reloc_count + 1 > relax_info->allocated_relocs_count)
8497 BFD_ASSERT (relax_info->allocated_relocs == NULL
8498 || sec->reloc_count == relax_info->relocs_count);
8500 if (relax_info->allocated_relocs_count == 0)
8501 new_relocs_count = (sec->reloc_count + 2) * 2;
8503 new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2;
8505 new_relocs = (Elf_Internal_Rela *)
8506 bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count));
8510 /* We could handle this more quickly by finding the split point. */
8512 memcpy (new_relocs, *internal_relocs_p,
8513 insert_at * sizeof (Elf_Internal_Rela));
8515 new_relocs[insert_at] = this_rela;
8517 if (insert_at != sec->reloc_count)
8518 memcpy (new_relocs + insert_at + 1,
8519 (*internal_relocs_p) + insert_at,
8520 (sec->reloc_count - insert_at)
8521 * sizeof (Elf_Internal_Rela));
8523 if (*internal_relocs_p != relax_info->allocated_relocs)
8525 /* The first time we re-allocate, we can only free the
8526 old relocs if they were allocated with bfd_malloc.
8527 This is not true when keep_memory is in effect. */
8528 if (!link_info->keep_memory)
8529 free (*internal_relocs_p);
8532 free (*internal_relocs_p);
8533 relax_info->allocated_relocs = new_relocs;
8534 relax_info->allocated_relocs_count = new_relocs_count;
8535 elf_section_data (sec)->relocs = new_relocs;
8537 relax_info->relocs_count = sec->reloc_count;
8538 *internal_relocs_p = new_relocs;
8542 if (insert_at != sec->reloc_count)
8545 for (idx = sec->reloc_count; idx > insert_at; idx--)
8546 (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1];
8548 (*internal_relocs_p)[insert_at] = this_rela;
8550 if (relax_info->allocated_relocs)
8551 relax_info->relocs_count = sec->reloc_count;
8558 /* This is similar to relax_section except that when a target is moved,
8559 we shift addresses up. We also need to modify the size. This
8560 algorithm does NOT allow for relocations into the middle of the
8561 property sections. */
8564 relax_property_section (bfd *abfd,
8566 struct bfd_link_info *link_info)
8568 Elf_Internal_Rela *internal_relocs;
8571 bfd_boolean ok = TRUE;
8572 bfd_boolean is_full_prop_section;
8573 size_t last_zfill_target_offset = 0;
8574 asection *last_zfill_target_sec = NULL;
8575 bfd_size_type sec_size;
8577 sec_size = bfd_get_section_limit (abfd, sec);
8578 internal_relocs = retrieve_internal_relocs (abfd, sec,
8579 link_info->keep_memory);
8580 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
8581 if (contents == NULL && sec_size != 0)
8587 is_full_prop_section =
8588 ((strcmp (sec->name, XTENSA_PROP_SEC_NAME) == 0)
8589 || (strncmp (sec->name, ".gnu.linkonce.prop.",
8590 sizeof ".gnu.linkonce.prop." - 1) == 0));
8592 if (internal_relocs)
8594 for (i = 0; i < sec->reloc_count; i++)
8596 Elf_Internal_Rela *irel;
8597 xtensa_relax_info *target_relax_info;
8599 asection *target_sec;
8601 bfd_byte *size_p, *flags_p;
8603 /* Locally change the source address.
8604 Translate the target to the new target address.
8605 If it points to this section and has been removed, MOVE IT.
8606 Also, don't forget to modify the associated SIZE at
8609 irel = &internal_relocs[i];
8610 r_type = ELF32_R_TYPE (irel->r_info);
8611 if (r_type == R_XTENSA_NONE)
8614 /* Find the literal value. */
8615 r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size);
8616 size_p = &contents[irel->r_offset + 4];
8618 if (is_full_prop_section)
8620 flags_p = &contents[irel->r_offset + 8];
8621 BFD_ASSERT (irel->r_offset + 12 <= sec_size);
8624 BFD_ASSERT (irel->r_offset + 8 <= sec_size);
8626 target_sec = r_reloc_get_section (&val.r_rel);
8627 target_relax_info = get_xtensa_relax_info (target_sec);
8629 if (target_relax_info
8630 && (target_relax_info->is_relaxable_literal_section
8631 || target_relax_info->is_relaxable_asm_section ))
8633 /* Translate the relocation's destination. */
8634 bfd_vma new_offset, new_end_offset;
8635 long old_size, new_size;
8637 new_offset = offset_with_removed_text
8638 (&target_relax_info->action_list, val.r_rel.target_offset);
8640 /* Assert that we are not out of bounds. */
8641 old_size = bfd_get_32 (abfd, size_p);
8645 /* Only the first zero-sized unreachable entry is
8646 allowed to expand. In this case the new offset
8647 should be the offset before the fill and the new
8648 size is the expansion size. For other zero-sized
8649 entries the resulting size should be zero with an
8650 offset before or after the fill address depending
8651 on whether the expanding unreachable entry
8653 if (last_zfill_target_sec
8654 && last_zfill_target_sec == target_sec
8655 && last_zfill_target_offset == val.r_rel.target_offset)
8656 new_end_offset = new_offset;
8659 new_end_offset = new_offset;
8660 new_offset = offset_with_removed_text_before_fill
8661 (&target_relax_info->action_list,
8662 val.r_rel.target_offset);
8664 /* If it is not unreachable and we have not yet
8665 seen an unreachable at this address, place it
8666 before the fill address. */
8668 || (bfd_get_32 (abfd, flags_p)
8669 & XTENSA_PROP_UNREACHABLE) == 0)
8670 new_end_offset = new_offset;
8673 last_zfill_target_sec = target_sec;
8674 last_zfill_target_offset = val.r_rel.target_offset;
8680 new_end_offset = offset_with_removed_text_before_fill
8681 (&target_relax_info->action_list,
8682 val.r_rel.target_offset + old_size);
8685 new_size = new_end_offset - new_offset;
8687 if (new_size != old_size)
8689 bfd_put_32 (abfd, new_size, size_p);
8690 pin_contents (sec, contents);
8693 if (new_offset != val.r_rel.target_offset)
8695 bfd_vma diff = new_offset - val.r_rel.target_offset;
8696 irel->r_addend += diff;
8697 pin_internal_relocs (sec, internal_relocs);
8703 /* Combine adjacent property table entries. This is also done in
8704 finish_dynamic_sections() but at that point it's too late to
8705 reclaim the space in the output section, so we do this twice. */
8707 if (internal_relocs && (!link_info->relocatable
8708 || strcmp (sec->name, XTENSA_LIT_SEC_NAME) == 0))
8710 Elf_Internal_Rela *last_irel = NULL;
8711 int removed_bytes = 0;
8712 bfd_vma offset, last_irel_offset;
8713 bfd_vma section_size;
8714 bfd_size_type entry_size;
8715 flagword predef_flags;
8717 if (is_full_prop_section)
8722 predef_flags = xtensa_get_property_predef_flags (sec);
8724 /* Walk over memory and irels at the same time.
8725 This REQUIRES that the internal_relocs be sorted by offset. */
8726 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
8727 internal_reloc_compare);
8728 nexti = 0; /* Index into internal_relocs. */
8730 pin_internal_relocs (sec, internal_relocs);
8731 pin_contents (sec, contents);
8733 last_irel_offset = (bfd_vma) -1;
8734 section_size = sec->size;
8735 BFD_ASSERT (section_size % entry_size == 0);
8737 for (offset = 0; offset < section_size; offset += entry_size)
8739 Elf_Internal_Rela *irel, *next_irel;
8740 bfd_vma bytes_to_remove, size, actual_offset;
8741 bfd_boolean remove_this_irel;
8747 /* Find the next two relocations (if there are that many left),
8748 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
8749 the starting reloc index. After these two loops, "i"
8750 is the index of the first non-NONE reloc past that starting
8751 index, and "nexti" is the index for the next non-NONE reloc
8754 for (i = nexti; i < sec->reloc_count; i++)
8756 if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE)
8758 irel = &internal_relocs[i];
8761 internal_relocs[i].r_offset -= removed_bytes;
8764 for (nexti = i + 1; nexti < sec->reloc_count; nexti++)
8766 if (ELF32_R_TYPE (internal_relocs[nexti].r_info)
8769 next_irel = &internal_relocs[nexti];
8772 internal_relocs[nexti].r_offset -= removed_bytes;
8775 remove_this_irel = FALSE;
8776 bytes_to_remove = 0;
8777 actual_offset = offset - removed_bytes;
8778 size = bfd_get_32 (abfd, &contents[actual_offset + 4]);
8780 if (is_full_prop_section)
8781 flags = bfd_get_32 (abfd, &contents[actual_offset + 8]);
8783 flags = predef_flags;
8785 /* Check that the irels are sorted by offset,
8786 with only one per address. */
8787 BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset);
8788 BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset);
8790 /* Make sure there aren't relocs on the size or flag fields. */
8791 if ((irel && irel->r_offset == offset + 4)
8792 || (is_full_prop_section
8793 && irel && irel->r_offset == offset + 8))
8795 irel->r_offset -= removed_bytes;
8796 last_irel_offset = irel->r_offset;
8798 else if (next_irel && (next_irel->r_offset == offset + 4
8799 || (is_full_prop_section
8800 && next_irel->r_offset == offset + 8)))
8803 irel->r_offset -= removed_bytes;
8804 next_irel->r_offset -= removed_bytes;
8805 last_irel_offset = next_irel->r_offset;
8807 else if (size == 0 && (flags & XTENSA_PROP_ALIGN) == 0
8808 && (flags & XTENSA_PROP_UNREACHABLE) == 0)
8810 /* Always remove entries with zero size and no alignment. */
8811 bytes_to_remove = entry_size;
8812 if (irel && irel->r_offset == offset)
8814 remove_this_irel = TRUE;
8816 irel->r_offset -= removed_bytes;
8817 last_irel_offset = irel->r_offset;
8820 else if (irel && irel->r_offset == offset)
8822 if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32)
8828 bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]);
8829 bfd_vma old_address =
8830 (last_irel->r_addend
8831 + bfd_get_32 (abfd, &contents[last_irel->r_offset]));
8832 bfd_vma new_address =
8834 + bfd_get_32 (abfd, &contents[actual_offset]));
8835 if (is_full_prop_section)
8836 old_flags = bfd_get_32
8837 (abfd, &contents[last_irel->r_offset + 8]);
8839 old_flags = predef_flags;
8841 if ((ELF32_R_SYM (irel->r_info)
8842 == ELF32_R_SYM (last_irel->r_info))
8843 && old_address + old_size == new_address
8844 && old_flags == flags
8845 && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0
8846 && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0)
8848 /* Fix the old size. */
8849 bfd_put_32 (abfd, old_size + size,
8850 &contents[last_irel->r_offset + 4]);
8851 bytes_to_remove = entry_size;
8852 remove_this_irel = TRUE;
8861 irel->r_offset -= removed_bytes;
8862 last_irel_offset = irel->r_offset;
8865 if (remove_this_irel)
8867 irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE);
8868 irel->r_offset -= bytes_to_remove;
8871 if (bytes_to_remove != 0)
8873 removed_bytes += bytes_to_remove;
8874 if (offset + bytes_to_remove < section_size)
8875 memmove (&contents[actual_offset],
8876 &contents[actual_offset + bytes_to_remove],
8877 section_size - offset - bytes_to_remove);
8883 /* Clear the removed bytes. */
8884 memset (&contents[section_size - removed_bytes], 0, removed_bytes);
8886 sec->size = section_size - removed_bytes;
8888 if (xtensa_is_littable_section (sec))
8890 bfd *dynobj = elf_hash_table (link_info)->dynobj;
8894 bfd_get_section_by_name (dynobj, ".got.loc");
8896 sgotloc->size -= removed_bytes;
8903 release_internal_relocs (sec, internal_relocs);
8904 release_contents (sec, contents);
8909 /* Third relaxation pass. */
8911 /* Change symbol values to account for removed literals. */
8914 relax_section_symbols (bfd *abfd, asection *sec)
8916 xtensa_relax_info *relax_info;
8917 unsigned int sec_shndx;
8918 Elf_Internal_Shdr *symtab_hdr;
8919 Elf_Internal_Sym *isymbuf;
8920 unsigned i, num_syms, num_locals;
8922 relax_info = get_xtensa_relax_info (sec);
8923 BFD_ASSERT (relax_info);
8925 if (!relax_info->is_relaxable_literal_section
8926 && !relax_info->is_relaxable_asm_section)
8929 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
8931 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8932 isymbuf = retrieve_local_syms (abfd);
8934 num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
8935 num_locals = symtab_hdr->sh_info;
8937 /* Adjust the local symbols defined in this section. */
8938 for (i = 0; i < num_locals; i++)
8940 Elf_Internal_Sym *isym = &isymbuf[i];
8942 if (isym->st_shndx == sec_shndx)
8944 bfd_vma new_address = offset_with_removed_text
8945 (&relax_info->action_list, isym->st_value);
8946 bfd_vma new_size = isym->st_size;
8948 if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC)
8950 bfd_vma new_end = offset_with_removed_text
8951 (&relax_info->action_list, isym->st_value + isym->st_size);
8952 new_size = new_end - new_address;
8955 isym->st_value = new_address;
8956 isym->st_size = new_size;
8960 /* Now adjust the global symbols defined in this section. */
8961 for (i = 0; i < (num_syms - num_locals); i++)
8963 struct elf_link_hash_entry *sym_hash;
8965 sym_hash = elf_sym_hashes (abfd)[i];
8967 if (sym_hash->root.type == bfd_link_hash_warning)
8968 sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link;
8970 if ((sym_hash->root.type == bfd_link_hash_defined
8971 || sym_hash->root.type == bfd_link_hash_defweak)
8972 && sym_hash->root.u.def.section == sec)
8974 bfd_vma new_address = offset_with_removed_text
8975 (&relax_info->action_list, sym_hash->root.u.def.value);
8976 bfd_vma new_size = sym_hash->size;
8978 if (sym_hash->type == STT_FUNC)
8980 bfd_vma new_end = offset_with_removed_text
8981 (&relax_info->action_list,
8982 sym_hash->root.u.def.value + sym_hash->size);
8983 new_size = new_end - new_address;
8986 sym_hash->root.u.def.value = new_address;
8987 sym_hash->size = new_size;
8995 /* "Fix" handling functions, called while performing relocations. */
8998 do_fix_for_relocatable_link (Elf_Internal_Rela *rel,
9000 asection *input_section,
9004 asection *sec, *old_sec;
9006 int r_type = ELF32_R_TYPE (rel->r_info);
9009 if (r_type == R_XTENSA_NONE)
9012 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9016 r_reloc_init (&r_rel, input_bfd, rel, contents,
9017 bfd_get_section_limit (input_bfd, input_section));
9018 old_sec = r_reloc_get_section (&r_rel);
9019 old_offset = r_rel.target_offset;
9021 if (!old_sec || !r_reloc_is_defined (&r_rel))
9023 if (r_type != R_XTENSA_ASM_EXPAND)
9025 (*_bfd_error_handler)
9026 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9027 input_bfd, input_section, rel->r_offset,
9028 elf_howto_table[r_type].name);
9031 /* Leave it be. Resolution will happen in a later stage. */
9035 sec = fix->target_sec;
9036 rel->r_addend += ((sec->output_offset + fix->target_offset)
9037 - (old_sec->output_offset + old_offset));
9044 do_fix_for_final_link (Elf_Internal_Rela *rel,
9046 asection *input_section,
9048 bfd_vma *relocationp)
9051 int r_type = ELF32_R_TYPE (rel->r_info);
9055 if (r_type == R_XTENSA_NONE)
9058 fix = get_bfd_fix (input_section, rel->r_offset, r_type);
9062 sec = fix->target_sec;
9064 fixup_diff = rel->r_addend;
9065 if (elf_howto_table[fix->src_type].partial_inplace)
9067 bfd_vma inplace_val;
9068 BFD_ASSERT (fix->src_offset
9069 < bfd_get_section_limit (input_bfd, input_section));
9070 inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]);
9071 fixup_diff += inplace_val;
9074 *relocationp = (sec->output_section->vma
9075 + sec->output_offset
9076 + fix->target_offset - fixup_diff);
9080 /* Miscellaneous utility functions.... */
9083 elf_xtensa_get_plt_section (bfd *dynobj, int chunk)
9088 return bfd_get_section_by_name (dynobj, ".plt");
9090 sprintf (plt_name, ".plt.%u", chunk);
9091 return bfd_get_section_by_name (dynobj, plt_name);
9096 elf_xtensa_get_gotplt_section (bfd *dynobj, int chunk)
9101 return bfd_get_section_by_name (dynobj, ".got.plt");
9103 sprintf (got_name, ".got.plt.%u", chunk);
9104 return bfd_get_section_by_name (dynobj, got_name);
9108 /* Get the input section for a given symbol index.
9110 . a section symbol, return the section;
9111 . a common symbol, return the common section;
9112 . an undefined symbol, return the undefined section;
9113 . an indirect symbol, follow the links;
9114 . an absolute value, return the absolute section. */
9117 get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
9119 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9120 asection *target_sec = NULL;
9121 if (r_symndx < symtab_hdr->sh_info)
9123 Elf_Internal_Sym *isymbuf;
9124 unsigned int section_index;
9126 isymbuf = retrieve_local_syms (abfd);
9127 section_index = isymbuf[r_symndx].st_shndx;
9129 if (section_index == SHN_UNDEF)
9130 target_sec = bfd_und_section_ptr;
9131 else if (section_index > 0 && section_index < SHN_LORESERVE)
9132 target_sec = bfd_section_from_elf_index (abfd, section_index);
9133 else if (section_index == SHN_ABS)
9134 target_sec = bfd_abs_section_ptr;
9135 else if (section_index == SHN_COMMON)
9136 target_sec = bfd_com_section_ptr;
9143 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9144 struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
9146 while (h->root.type == bfd_link_hash_indirect
9147 || h->root.type == bfd_link_hash_warning)
9148 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9150 switch (h->root.type)
9152 case bfd_link_hash_defined:
9153 case bfd_link_hash_defweak:
9154 target_sec = h->root.u.def.section;
9156 case bfd_link_hash_common:
9157 target_sec = bfd_com_section_ptr;
9159 case bfd_link_hash_undefined:
9160 case bfd_link_hash_undefweak:
9161 target_sec = bfd_und_section_ptr;
9163 default: /* New indirect warning. */
9164 target_sec = bfd_und_section_ptr;
9172 static struct elf_link_hash_entry *
9173 get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx)
9176 struct elf_link_hash_entry *h;
9177 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9179 if (r_symndx < symtab_hdr->sh_info)
9182 indx = r_symndx - symtab_hdr->sh_info;
9183 h = elf_sym_hashes (abfd)[indx];
9184 while (h->root.type == bfd_link_hash_indirect
9185 || h->root.type == bfd_link_hash_warning)
9186 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9191 /* Get the section-relative offset for a symbol number. */
9194 get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
9196 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9199 if (r_symndx < symtab_hdr->sh_info)
9201 Elf_Internal_Sym *isymbuf;
9202 isymbuf = retrieve_local_syms (abfd);
9203 offset = isymbuf[r_symndx].st_value;
9207 unsigned long indx = r_symndx - symtab_hdr->sh_info;
9208 struct elf_link_hash_entry *h =
9209 elf_sym_hashes (abfd)[indx];
9211 while (h->root.type == bfd_link_hash_indirect
9212 || h->root.type == bfd_link_hash_warning)
9213 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9214 if (h->root.type == bfd_link_hash_defined
9215 || h->root.type == bfd_link_hash_defweak)
9216 offset = h->root.u.def.value;
9223 is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel)
9225 unsigned long r_symndx = ELF32_R_SYM (rel->r_info);
9226 struct elf_link_hash_entry *h;
9228 h = get_elf_r_symndx_hash_entry (abfd, r_symndx);
9229 if (h && h->root.type == bfd_link_hash_defweak)
9236 pcrel_reloc_fits (xtensa_opcode opc,
9238 bfd_vma self_address,
9239 bfd_vma dest_address)
9241 xtensa_isa isa = xtensa_default_isa;
9242 uint32 valp = dest_address;
9243 if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address)
9244 || xtensa_operand_encode (isa, opc, opnd, &valp))
9250 static int linkonce_len = sizeof (".gnu.linkonce.") - 1;
9251 static int insn_sec_len = sizeof (XTENSA_INSN_SEC_NAME) - 1;
9252 static int lit_sec_len = sizeof (XTENSA_LIT_SEC_NAME) - 1;
9253 static int prop_sec_len = sizeof (XTENSA_PROP_SEC_NAME) - 1;
9257 xtensa_is_property_section (asection *sec)
9259 if (strncmp (XTENSA_INSN_SEC_NAME, sec->name, insn_sec_len) == 0
9260 || strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0
9261 || strncmp (XTENSA_PROP_SEC_NAME, sec->name, prop_sec_len) == 0)
9264 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9265 && (strncmp (&sec->name[linkonce_len], "x.", 2) == 0
9266 || strncmp (&sec->name[linkonce_len], "p.", 2) == 0
9267 || strncmp (&sec->name[linkonce_len], "prop.", 5) == 0))
9275 xtensa_is_littable_section (asection *sec)
9277 if (strncmp (XTENSA_LIT_SEC_NAME, sec->name, lit_sec_len) == 0)
9280 if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0
9281 && sec->name[linkonce_len] == 'p'
9282 && sec->name[linkonce_len + 1] == '.')
9290 internal_reloc_compare (const void *ap, const void *bp)
9292 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9293 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9295 if (a->r_offset != b->r_offset)
9296 return (a->r_offset - b->r_offset);
9298 /* We don't need to sort on these criteria for correctness,
9299 but enforcing a more strict ordering prevents unstable qsort
9300 from behaving differently with different implementations.
9301 Without the code below we get correct but different results
9302 on Solaris 2.7 and 2.8. We would like to always produce the
9303 same results no matter the host. */
9305 if (a->r_info != b->r_info)
9306 return (a->r_info - b->r_info);
9308 return (a->r_addend - b->r_addend);
9313 internal_reloc_matches (const void *ap, const void *bp)
9315 const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
9316 const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
9318 /* Check if one entry overlaps with the other; this shouldn't happen
9319 except when searching for a match. */
9320 return (a->r_offset - b->r_offset);
9325 xtensa_get_property_section_name (asection *sec, const char *base_name)
9327 if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0)
9329 char *prop_sec_name;
9331 char *linkonce_kind = 0;
9333 if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0)
9334 linkonce_kind = "x.";
9335 else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0)
9336 linkonce_kind = "p.";
9337 else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0)
9338 linkonce_kind = "prop.";
9342 prop_sec_name = (char *) bfd_malloc (strlen (sec->name)
9343 + strlen (linkonce_kind) + 1);
9344 memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len);
9345 strcpy (prop_sec_name + linkonce_len, linkonce_kind);
9347 suffix = sec->name + linkonce_len;
9348 /* For backward compatibility, replace "t." instead of inserting
9349 the new linkonce_kind (but not for "prop" sections). */
9350 if (strncmp (suffix, "t.", 2) == 0 && linkonce_kind[1] == '.')
9352 strcat (prop_sec_name + linkonce_len, suffix);
9354 return prop_sec_name;
9357 return strdup (base_name);
9362 xtensa_get_property_predef_flags (asection *sec)
9364 if (strcmp (sec->name, XTENSA_INSN_SEC_NAME) == 0
9365 || strncmp (sec->name, ".gnu.linkonce.x.",
9366 sizeof ".gnu.linkonce.x." - 1) == 0)
9367 return (XTENSA_PROP_INSN
9368 | XTENSA_PROP_INSN_NO_TRANSFORM
9369 | XTENSA_PROP_INSN_NO_REORDER);
9371 if (xtensa_is_littable_section (sec))
9372 return (XTENSA_PROP_LITERAL
9373 | XTENSA_PROP_INSN_NO_TRANSFORM
9374 | XTENSA_PROP_INSN_NO_REORDER);
9380 /* Other functions called directly by the linker. */
9383 xtensa_callback_required_dependence (bfd *abfd,
9385 struct bfd_link_info *link_info,
9386 deps_callback_t callback,
9389 Elf_Internal_Rela *internal_relocs;
9392 bfd_boolean ok = TRUE;
9393 bfd_size_type sec_size;
9395 sec_size = bfd_get_section_limit (abfd, sec);
9397 /* ".plt*" sections have no explicit relocations but they contain L32R
9398 instructions that reference the corresponding ".got.plt*" sections. */
9399 if ((sec->flags & SEC_LINKER_CREATED) != 0
9400 && strncmp (sec->name, ".plt", 4) == 0)
9404 /* Find the corresponding ".got.plt*" section. */
9405 if (sec->name[4] == '\0')
9406 sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt");
9412 BFD_ASSERT (sec->name[4] == '.');
9413 chunk = strtol (&sec->name[5], NULL, 10);
9415 sprintf (got_name, ".got.plt.%u", chunk);
9416 sgotplt = bfd_get_section_by_name (sec->owner, got_name);
9418 BFD_ASSERT (sgotplt);
9420 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9421 section referencing a literal at the very beginning of
9422 ".got.plt". This is very close to the real dependence, anyway. */
9423 (*callback) (sec, sec_size, sgotplt, 0, closure);
9426 internal_relocs = retrieve_internal_relocs (abfd, sec,
9427 link_info->keep_memory);
9428 if (internal_relocs == NULL
9429 || sec->reloc_count == 0)
9432 /* Cache the contents for the duration of this scan. */
9433 contents = retrieve_contents (abfd, sec, link_info->keep_memory);
9434 if (contents == NULL && sec_size != 0)
9440 if (!xtensa_default_isa)
9441 xtensa_default_isa = xtensa_isa_init (0, 0);
9443 for (i = 0; i < sec->reloc_count; i++)
9445 Elf_Internal_Rela *irel = &internal_relocs[i];
9446 if (is_l32r_relocation (abfd, sec, contents, irel))
9449 asection *target_sec;
9450 bfd_vma target_offset;
9452 r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size);
9455 /* L32Rs must be local to the input file. */
9456 if (r_reloc_is_defined (&l32r_rel))
9458 target_sec = r_reloc_get_section (&l32r_rel);
9459 target_offset = l32r_rel.target_offset;
9461 (*callback) (sec, irel->r_offset, target_sec, target_offset,
9467 release_internal_relocs (sec, internal_relocs);
9468 release_contents (sec, contents);
9472 /* The default literal sections should always be marked as "code" (i.e.,
9473 SHF_EXECINSTR). This is particularly important for the Linux kernel
9474 module loader so that the literals are not placed after the text. */
9475 static const struct bfd_elf_special_section elf_xtensa_special_sections[] =
9477 { ".fini.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9478 { ".init.literal", 13, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9479 { ".literal", 8, 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
9480 { NULL, 0, 0, 0, 0 }
9484 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9485 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9486 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9487 #define TARGET_BIG_NAME "elf32-xtensa-be"
9488 #define ELF_ARCH bfd_arch_xtensa
9490 #define ELF_MACHINE_CODE EM_XTENSA
9491 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9494 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9495 #else /* !XCHAL_HAVE_MMU */
9496 #define ELF_MAXPAGESIZE 1
9497 #endif /* !XCHAL_HAVE_MMU */
9498 #endif /* ELF_ARCH */
9500 #define elf_backend_can_gc_sections 1
9501 #define elf_backend_can_refcount 1
9502 #define elf_backend_plt_readonly 1
9503 #define elf_backend_got_header_size 4
9504 #define elf_backend_want_dynbss 0
9505 #define elf_backend_want_got_plt 1
9507 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9509 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9510 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9511 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9512 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9513 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9514 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9516 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9517 #define elf_backend_check_relocs elf_xtensa_check_relocs
9518 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9519 #define elf_backend_discard_info elf_xtensa_discard_info
9520 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9521 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9522 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9523 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9524 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9525 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9526 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9527 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9528 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9529 #define elf_backend_modify_segment_map elf_xtensa_modify_segment_map
9530 #define elf_backend_object_p elf_xtensa_object_p
9531 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9532 #define elf_backend_relocate_section elf_xtensa_relocate_section
9533 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9534 #define elf_backend_special_sections elf_xtensa_special_sections
9536 #include "elf32-target.h"