1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28 static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static boolean elf_s390_is_local_label_name PARAMS ((bfd *, const char *));
33 static struct bfd_hash_entry *elf_s390_link_hash_newfunc
34 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
35 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 static boolean elf_s390_check_relocs
38 PARAMS ((bfd *, struct bfd_link_info *, asection *,
39 const Elf_Internal_Rela *));
40 static asection *elf_s390_gc_mark_hook
41 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
42 struct elf_link_hash_entry *, Elf_Internal_Sym *));
43 static boolean elf_s390_gc_sweep_hook
44 PARAMS ((bfd *, struct bfd_link_info *, asection *,
45 const Elf_Internal_Rela *));
46 static boolean elf_s390_adjust_dynamic_symbol
47 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
48 static boolean elf_s390_size_dynamic_sections
49 PARAMS ((bfd *, struct bfd_link_info *));
50 static boolean elf_s390_relocate_section
51 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
52 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
53 static boolean elf_s390_finish_dynamic_symbol
54 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
56 static boolean elf_s390_finish_dynamic_sections
57 PARAMS ((bfd *, struct bfd_link_info *));
58 static boolean elf_s390_object_p PARAMS ((bfd *));
59 static enum elf_reloc_type_class elf_s390_reloc_type_class
60 PARAMS ((const Elf_Internal_Rela *));
62 #define USE_RELA 1 /* We want RELA relocations, not REL. */
66 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
67 from smaller values. Start with zero, widen, *then* decrement. */
68 #define MINUS_ONE (((bfd_vma)0) - 1)
70 /* The relocation "howto" table. */
71 static reloc_howto_type elf_howto_table[] =
73 HOWTO (R_390_NONE, /* type */
75 0, /* size (0 = byte, 1 = short, 2 = long) */
77 false, /* pc_relative */
79 complain_overflow_dont, /* complain_on_overflow */
80 bfd_elf_generic_reloc, /* special_function */
81 "R_390_NONE", /* name */
82 false, /* partial_inplace */
85 false), /* pcrel_offset */
87 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
88 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
89 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
90 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
91 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
92 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
93 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
94 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
95 HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false),
96 HOWTO(R_390_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,MINUS_ONE, false),
97 HOWTO(R_390_JMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,MINUS_ONE, false),
98 HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false),
99 HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false),
100 HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true),
101 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
102 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
103 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
104 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
105 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
106 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
107 HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true),
108 HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false),
109 HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true),
110 HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false),
111 HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true),
112 HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true),
115 /* GNU extension to record C++ vtable hierarchy. */
116 static reloc_howto_type elf64_s390_vtinherit_howto =
117 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
118 static reloc_howto_type elf64_s390_vtentry_howto =
119 HOWTO (R_390_GNU_VTENTRY, 0,4,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
121 static reloc_howto_type *
122 elf_s390_reloc_type_lookup (abfd, code)
123 bfd *abfd ATTRIBUTE_UNUSED;
124 bfd_reloc_code_real_type code;
128 return &elf_howto_table[(int) R_390_NONE];
130 return &elf_howto_table[(int) R_390_8];
131 case BFD_RELOC_390_12:
132 return &elf_howto_table[(int) R_390_12];
134 return &elf_howto_table[(int) R_390_16];
136 return &elf_howto_table[(int) R_390_32];
138 return &elf_howto_table[(int) R_390_32];
139 case BFD_RELOC_32_PCREL:
140 return &elf_howto_table[(int) R_390_PC32];
141 case BFD_RELOC_390_GOT12:
142 return &elf_howto_table[(int) R_390_GOT12];
143 case BFD_RELOC_32_GOT_PCREL:
144 return &elf_howto_table[(int) R_390_GOT32];
145 case BFD_RELOC_390_PLT32:
146 return &elf_howto_table[(int) R_390_PLT32];
147 case BFD_RELOC_390_COPY:
148 return &elf_howto_table[(int) R_390_COPY];
149 case BFD_RELOC_390_GLOB_DAT:
150 return &elf_howto_table[(int) R_390_GLOB_DAT];
151 case BFD_RELOC_390_JMP_SLOT:
152 return &elf_howto_table[(int) R_390_JMP_SLOT];
153 case BFD_RELOC_390_RELATIVE:
154 return &elf_howto_table[(int) R_390_RELATIVE];
155 case BFD_RELOC_32_GOTOFF:
156 return &elf_howto_table[(int) R_390_GOTOFF];
157 case BFD_RELOC_390_GOTPC:
158 return &elf_howto_table[(int) R_390_GOTPC];
159 case BFD_RELOC_390_GOT16:
160 return &elf_howto_table[(int) R_390_GOT16];
161 case BFD_RELOC_16_PCREL:
162 return &elf_howto_table[(int) R_390_PC16];
163 case BFD_RELOC_390_PC16DBL:
164 return &elf_howto_table[(int) R_390_PC16DBL];
165 case BFD_RELOC_390_PLT16DBL:
166 return &elf_howto_table[(int) R_390_PLT16DBL];
167 case BFD_RELOC_VTABLE_INHERIT:
168 return &elf64_s390_vtinherit_howto;
169 case BFD_RELOC_VTABLE_ENTRY:
170 return &elf64_s390_vtentry_howto;
171 case BFD_RELOC_390_PC32DBL:
172 return &elf_howto_table[(int) R_390_PC32DBL];
173 case BFD_RELOC_390_PLT32DBL:
174 return &elf_howto_table[(int) R_390_PLT32DBL];
175 case BFD_RELOC_390_GOTPCDBL:
176 return &elf_howto_table[(int) R_390_GOTPCDBL];
178 return &elf_howto_table[(int) R_390_64];
179 case BFD_RELOC_64_PCREL:
180 return &elf_howto_table[(int) R_390_PC64];
181 case BFD_RELOC_390_GOT64:
182 return &elf_howto_table[(int) R_390_GOT64];
183 case BFD_RELOC_390_PLT64:
184 return &elf_howto_table[(int) R_390_PLT64];
185 case BFD_RELOC_390_GOTENT:
186 return &elf_howto_table[(int) R_390_GOTENT];
193 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
194 and elf64-s390.c has its own copy. */
197 elf_s390_info_to_howto (abfd, cache_ptr, dst)
198 bfd *abfd ATTRIBUTE_UNUSED;
200 Elf_Internal_Rela *dst;
202 switch (ELF64_R_TYPE(dst->r_info))
204 case R_390_GNU_VTINHERIT:
205 cache_ptr->howto = &elf64_s390_vtinherit_howto;
208 case R_390_GNU_VTENTRY:
209 cache_ptr->howto = &elf64_s390_vtentry_howto;
213 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
214 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
219 elf_s390_is_local_label_name (abfd, name)
223 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
226 return _bfd_elf_is_local_label_name (abfd, name);
229 /* Functions for the 390 ELF linker. */
231 /* The name of the dynamic interpreter. This is put in the .interp
234 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
236 /* The nop opcode we use. */
238 #define s390_NOP 0x07070707
241 /* The size in bytes of the first entry in the procedure linkage table. */
242 #define PLT_FIRST_ENTRY_SIZE 32
243 /* The size in bytes of an entry in the procedure linkage table. */
244 #define PLT_ENTRY_SIZE 32
246 #define GOT_ENTRY_SIZE 8
248 /* The first three entries in a procedure linkage table are reserved,
249 and the initial contents are unimportant (we zero them out).
250 Subsequent entries look like this. See the SVR4 ABI 386
251 supplement to see how this works. */
253 /* For the s390, simple addr offset can only be 0 - 4096.
254 To use the full 16777216 TB address space, several instructions
255 are needed to load an address in a register and execute
256 a branch( or just saving the address)
258 Furthermore, only r 0 and 1 are free to use!!! */
260 /* The first 3 words in the GOT are then reserved.
261 Word 0 is the address of the dynamic table.
262 Word 1 is a pointer to a structure describing the object
263 Word 2 is used to point to the loader entry address.
265 The code for PLT entries looks like this:
267 The GOT holds the address in the PLT to be executed.
268 The loader then gets:
269 24(15) = Pointer to the structure describing the object.
270 28(15) = Offset in symbol table
271 The loader must then find the module where the function is
272 and insert the address in the GOT.
274 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
275 LG 1,0(1) # 6 bytes Load address from GOT in r1
276 BCR 15,1 # 2 bytes Jump to address
277 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
278 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
279 BRCL 15,-x # 6 bytes Jump to start of PLT
280 .long ? # 4 bytes offset into symbol table
282 Total = 32 bytes per PLT entry
283 Fixup at offset 2: relative address to GOT entry
284 Fixup at offset 22: relative branch to PLT0
285 Fixup at offset 28: 32 bit offset into symbol table
287 A 32 bit offset into the symbol table is enough. It allows for symbol
288 tables up to a size of 2 gigabyte. A single dynamic object (the main
289 program, any shared library) is limited to 4GB in size and I want to see
290 the program that manages to have a symbol table of more than 2 GB with a
291 total size of at max 4 GB. */
293 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
294 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
295 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
296 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
297 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
298 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
299 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
300 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
302 /* The first PLT entry pushes the offset into the symbol table
303 from R1 onto the stack at 8(15) and the loader object info
304 at 12(15), loads the loader address in R1 and jumps to it. */
306 /* The first entry in the PLT:
309 STG 1,56(15) # r1 contains the offset into the symbol table
310 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
311 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
312 LG 1,16(1) # get entry address of loader
313 BCR 15,1 # jump to loader
315 Fixup at offset 8: relative address to start of GOT. */
317 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
318 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
319 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
320 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
321 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
322 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
323 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
324 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
326 /* The s390 linker needs to keep track of the number of relocs that it
327 decides to copy in check_relocs for each symbol. This is so that
328 it can discard PC relative relocs if it doesn't need them when
329 linking with -Bsymbolic. We store the information in a field
330 extending the regular ELF linker hash table. */
332 /* This structure keeps track of the number of PC relative relocs we
333 have copied for a given symbol. */
335 struct elf_s390_pcrel_relocs_copied
338 struct elf_s390_pcrel_relocs_copied *next;
339 /* A section in dynobj. */
341 /* Number of relocs copied in this section. */
345 /* s390 ELF linker hash entry. */
347 struct elf_s390_link_hash_entry
349 struct elf_link_hash_entry root;
351 /* Number of PC relative relocs copied for this symbol. */
352 struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied;
355 /* s390 ELF linker hash table. */
357 struct elf_s390_link_hash_table
359 struct elf_link_hash_table root;
362 /* Declare this now that the above structures are defined. */
364 static boolean elf_s390_discard_copies
365 PARAMS ((struct elf_s390_link_hash_entry *, PTR));
367 /* Traverse an s390 ELF linker hash table. */
369 #define elf_s390_link_hash_traverse(table, func, info) \
370 (elf_link_hash_traverse \
372 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
375 /* Get the s390 ELF linker hash table from a link_info structure. */
377 #define elf_s390_hash_table(p) \
378 ((struct elf_s390_link_hash_table *) ((p)->hash))
380 /* Create an entry in an s390 ELF linker hash table. */
382 static struct bfd_hash_entry *
383 elf_s390_link_hash_newfunc (entry, table, string)
384 struct bfd_hash_entry *entry;
385 struct bfd_hash_table *table;
388 struct elf_s390_link_hash_entry *ret =
389 (struct elf_s390_link_hash_entry *) entry;
391 /* Allocate the structure if it has not already been allocated by a
393 if (ret == (struct elf_s390_link_hash_entry *) NULL)
394 ret = ((struct elf_s390_link_hash_entry *)
395 bfd_hash_allocate (table,
396 sizeof (struct elf_s390_link_hash_entry)));
397 if (ret == (struct elf_s390_link_hash_entry *) NULL)
398 return (struct bfd_hash_entry *) ret;
400 /* Call the allocation method of the superclass. */
401 ret = ((struct elf_s390_link_hash_entry *)
402 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
404 if (ret != (struct elf_s390_link_hash_entry *) NULL)
406 ret->pcrel_relocs_copied = NULL;
409 return (struct bfd_hash_entry *) ret;
412 /* Create an s390 ELF linker hash table. */
414 static struct bfd_link_hash_table *
415 elf_s390_link_hash_table_create (abfd)
418 struct elf_s390_link_hash_table *ret;
419 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
421 ret = ((struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt));
422 if (ret == (struct elf_s390_link_hash_table *) NULL)
425 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
426 elf_s390_link_hash_newfunc))
428 bfd_release (abfd, ret);
432 return &ret->root.root;
436 /* Look through the relocs for a section during the first phase, and
437 allocate space in the global offset table or procedure linkage
441 elf_s390_check_relocs (abfd, info, sec, relocs)
443 struct bfd_link_info *info;
445 const Elf_Internal_Rela *relocs;
448 Elf_Internal_Shdr *symtab_hdr;
449 struct elf_link_hash_entry **sym_hashes;
450 bfd_signed_vma *local_got_refcounts;
451 const Elf_Internal_Rela *rel;
452 const Elf_Internal_Rela *rel_end;
457 if (info->relocateable)
460 dynobj = elf_hash_table (info)->dynobj;
461 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
462 sym_hashes = elf_sym_hashes (abfd);
463 local_got_refcounts = elf_local_got_offsets (abfd);
469 rel_end = relocs + sec->reloc_count;
470 for (rel = relocs; rel < rel_end; rel++)
472 unsigned long r_symndx;
473 struct elf_link_hash_entry *h;
475 r_symndx = ELF64_R_SYM (rel->r_info);
477 if (r_symndx < symtab_hdr->sh_info)
480 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
482 /* Some relocs require a global offset table. */
485 switch (ELF64_R_TYPE (rel->r_info))
495 elf_hash_table (info)->dynobj = dynobj = abfd;
496 if (! _bfd_elf_create_got_section (dynobj, info))
506 switch (ELF64_R_TYPE (rel->r_info))
513 /* This symbol requires a global offset table entry. */
517 sgot = bfd_get_section_by_name (dynobj, ".got");
518 BFD_ASSERT (sgot != NULL);
523 && (h != NULL || info->shared))
525 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
528 srelgot = bfd_make_section (dynobj, ".rela.got");
530 || ! bfd_set_section_flags (dynobj, srelgot,
537 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
544 if (h->got.refcount == 0)
546 /* Make sure this symbol is output as a dynamic symbol. */
547 if (h->dynindx == -1)
549 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
553 sgot->_raw_size += 8;
554 srelgot->_raw_size += sizeof (Elf64_External_Rela);
556 h->got.refcount += 1;
560 /* This is a global offset table entry for a local symbol. */
561 if (local_got_refcounts == NULL)
565 size = symtab_hdr->sh_info * sizeof (bfd_vma);
566 local_got_refcounts = ((bfd_signed_vma *)
567 bfd_zalloc (abfd, size));
568 if (local_got_refcounts == NULL)
570 elf_local_got_refcounts (abfd) = local_got_refcounts;
572 if (local_got_refcounts[r_symndx] == 0)
574 sgot->_raw_size += 8;
577 /* If we are generating a shared object, we need to
578 output a R_390_RELATIVE reloc so that the dynamic
579 linker can adjust this GOT entry. */
580 srelgot->_raw_size += sizeof (Elf64_External_Rela);
583 local_got_refcounts[r_symndx] += 1;
591 /* This symbol requires a procedure linkage table entry. We
592 actually build the entry in adjust_dynamic_symbol,
593 because this might be a case of linking PIC code which is
594 never referenced by a dynamic object, in which case we
595 don't need to generate a procedure linkage table entry
598 /* If this is a local symbol, we resolve it directly without
599 creating a procedure linkage table entry. */
603 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
604 h->plt.refcount += 1;
617 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
619 /* If we are creating a shared library, and this is a reloc
620 against a global symbol, or a non PC relative reloc
621 against a local symbol, then we need to copy the reloc
622 into the shared library. However, if we are linking with
623 -Bsymbolic, we do not need to copy a reloc against a
624 global symbol which is defined in an object we are
625 including in the link (i.e., DEF_REGULAR is set). At
626 this point we have not seen all the input files, so it is
627 possible that DEF_REGULAR is not set now but will be set
628 later (it is never cleared). We account for that
629 possibility below by storing information in the
630 pcrel_relocs_copied field of the hash table entry. */
632 && (sec->flags & SEC_ALLOC) != 0
633 && (ELF64_R_TYPE (rel->r_info) == R_390_8
634 || ELF64_R_TYPE (rel->r_info) == R_390_16
635 || ELF64_R_TYPE (rel->r_info) == R_390_32
636 || ELF64_R_TYPE (rel->r_info) == R_390_64
640 || (h->elf_link_hash_flags
641 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
643 /* When creating a shared object, we must copy these
644 reloc types into the output file. We create a reloc
645 section in dynobj and make room for this reloc. */
650 name = (bfd_elf_string_from_elf_section
652 elf_elfheader (abfd)->e_shstrndx,
653 elf_section_data (sec)->rel_hdr.sh_name));
657 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
658 && strcmp (bfd_get_section_name (abfd, sec),
661 sreloc = bfd_get_section_by_name (dynobj, name);
666 sreloc = bfd_make_section (dynobj, name);
667 flags = (SEC_HAS_CONTENTS | SEC_READONLY
668 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
669 if ((sec->flags & SEC_ALLOC) != 0)
670 flags |= SEC_ALLOC | SEC_LOAD;
672 || ! bfd_set_section_flags (dynobj, sreloc, flags)
673 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
676 if (sec->flags & SEC_READONLY)
677 info->flags |= DF_TEXTREL;
680 sreloc->_raw_size += sizeof (Elf64_External_Rela);
682 /* If we are linking with -Bsymbolic, and this is a
683 global symbol, we count the number of PC relative
684 relocations we have entered for this symbol, so that
685 we can discard them again if the symbol is later
686 defined by a regular object. Note that this function
687 is only called if we are using an elf64_s390 linker
688 hash table, which means that h is really a pointer to
689 an elf64_s390_link_hash_entry. */
691 && (ELF64_R_TYPE (rel->r_info) == R_390_PC16 ||
692 ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL ||
693 ELF64_R_TYPE (rel->r_info) == R_390_PC32 ||
694 ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL ||
695 ELF64_R_TYPE (rel->r_info) == R_390_PC64))
697 struct elf_s390_link_hash_entry *eh;
698 struct elf_s390_pcrel_relocs_copied *p;
700 eh = (struct elf_s390_link_hash_entry *) h;
702 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
703 if (p->section == sreloc)
708 p = ((struct elf_s390_pcrel_relocs_copied *)
709 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
712 p->next = eh->pcrel_relocs_copied;
713 eh->pcrel_relocs_copied = p;
724 /* This relocation describes the C++ object vtable hierarchy.
725 Reconstruct it for later use during GC. */
726 case R_390_GNU_VTINHERIT:
727 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
731 /* This relocation describes which C++ vtable entries are actually
732 used. Record for later use during GC. */
733 case R_390_GNU_VTENTRY:
734 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
746 /* Return the section that should be marked against GC for a given
750 elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
752 struct bfd_link_info *info ATTRIBUTE_UNUSED;
753 Elf_Internal_Rela *rel;
754 struct elf_link_hash_entry *h;
755 Elf_Internal_Sym *sym;
759 switch (ELF64_R_TYPE (rel->r_info))
761 case R_390_GNU_VTINHERIT:
762 case R_390_GNU_VTENTRY:
766 switch (h->root.type)
768 case bfd_link_hash_defined:
769 case bfd_link_hash_defweak:
770 return h->root.u.def.section;
772 case bfd_link_hash_common:
773 return h->root.u.c.p->section;
782 if (!(elf_bad_symtab (abfd)
783 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
784 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
785 && sym->st_shndx != SHN_COMMON))
787 return bfd_section_from_elf_index (abfd, sym->st_shndx);
794 /* Update the got entry reference counts for the section being removed. */
797 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
798 bfd *abfd ATTRIBUTE_UNUSED;
799 struct bfd_link_info *info ATTRIBUTE_UNUSED;
800 asection *sec ATTRIBUTE_UNUSED;
801 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
803 Elf_Internal_Shdr *symtab_hdr;
804 struct elf_link_hash_entry **sym_hashes;
805 bfd_signed_vma *local_got_refcounts;
806 const Elf_Internal_Rela *rel, *relend;
807 unsigned long r_symndx;
808 struct elf_link_hash_entry *h;
813 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
814 sym_hashes = elf_sym_hashes (abfd);
815 local_got_refcounts = elf_local_got_refcounts (abfd);
817 dynobj = elf_hash_table (info)->dynobj;
821 sgot = bfd_get_section_by_name (dynobj, ".got");
822 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
824 relend = relocs + sec->reloc_count;
825 for (rel = relocs; rel < relend; rel++)
826 switch (ELF64_R_TYPE (rel->r_info))
836 r_symndx = ELF64_R_SYM (rel->r_info);
837 if (r_symndx >= symtab_hdr->sh_info)
839 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
840 if (h->got.refcount > 0)
842 h->got.refcount -= 1;
843 if (h->got.refcount == 0)
845 sgot->_raw_size -= 8;
846 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
850 else if (local_got_refcounts != NULL)
852 if (local_got_refcounts[r_symndx] > 0)
854 local_got_refcounts[r_symndx] -= 1;
855 if (local_got_refcounts[r_symndx] == 0)
857 sgot->_raw_size -= 8;
859 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
869 r_symndx = ELF64_R_SYM (rel->r_info);
870 if (r_symndx >= symtab_hdr->sh_info)
872 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
873 if (h->plt.refcount > 0)
874 h->plt.refcount -= 1;
885 /* Adjust a symbol defined by a dynamic object and referenced by a
886 regular object. The current definition is in some section of the
887 dynamic object, but we're not including those sections. We have to
888 change the definition to something the rest of the link can
892 elf_s390_adjust_dynamic_symbol (info, h)
893 struct bfd_link_info *info;
894 struct elf_link_hash_entry *h;
898 unsigned int power_of_two;
900 dynobj = elf_hash_table (info)->dynobj;
902 /* Make sure we know what is going on here. */
903 BFD_ASSERT (dynobj != NULL
904 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
905 || h->weakdef != NULL
906 || ((h->elf_link_hash_flags
907 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
908 && (h->elf_link_hash_flags
909 & ELF_LINK_HASH_REF_REGULAR) != 0
910 && (h->elf_link_hash_flags
911 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
913 /* If this is a function, put it in the procedure linkage table. We
914 will fill in the contents of the procedure linkage table later
915 (although we could actually do it here). */
916 if (h->type == STT_FUNC
917 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
920 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
921 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
922 || (info->shared && h->plt.refcount <= 0))
924 /* This case can occur if we saw a PLT32 reloc in an input
925 file, but the symbol was never referred to by a dynamic
926 object. In such a case, we don't actually need to build
927 a procedure linkage table, and we can just do a PC32
929 h->plt.offset = (bfd_vma) -1;
930 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
934 /* Make sure this symbol is output as a dynamic symbol. */
935 if (h->dynindx == -1)
937 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
941 s = bfd_get_section_by_name (dynobj, ".plt");
942 BFD_ASSERT (s != NULL);
945 /* The first entry in .plt is reserved. */
946 if (s->_raw_size == 0)
947 s->_raw_size = PLT_FIRST_ENTRY_SIZE;
949 /* If this symbol is not defined in a regular file, and we are
950 not generating a shared library, then set the symbol to this
951 location in the .plt. This is required to make function
952 pointers compare as equal between the normal executable and
953 the shared library. */
955 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
957 h->root.u.def.section = s;
958 h->root.u.def.value = s->_raw_size;
961 h->plt.offset = s->_raw_size;
963 /* Make room for this entry. */
964 s->_raw_size += PLT_ENTRY_SIZE;
966 /* We also need to make an entry in the .got.plt section, which
967 will be placed in the .got section by the linker script. */
968 s = bfd_get_section_by_name (dynobj, ".got.plt");
969 BFD_ASSERT (s != NULL);
970 s->_raw_size += GOT_ENTRY_SIZE;
972 /* We also need to make an entry in the .rela.plt section. */
973 s = bfd_get_section_by_name (dynobj, ".rela.plt");
974 BFD_ASSERT (s != NULL);
975 s->_raw_size += sizeof (Elf64_External_Rela);
980 h->plt.offset = (bfd_vma) -1;
982 /* If this is a weak symbol, and there is a real definition, the
983 processor independent code will have arranged for us to see the
984 real definition first, and we can just use the same value. */
985 if (h->weakdef != NULL)
987 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
988 || h->weakdef->root.type == bfd_link_hash_defweak);
989 h->root.u.def.section = h->weakdef->root.u.def.section;
990 h->root.u.def.value = h->weakdef->root.u.def.value;
994 /* This is a reference to a symbol defined by a dynamic object which
995 is not a function. */
997 /* If we are creating a shared library, we must presume that the
998 only references to the symbol are via the global offset table.
999 For such cases we need not do anything here; the relocations will
1000 be handled correctly by relocate_section. */
1004 /* If there are no references to this symbol that do not use the
1005 GOT, we don't need to generate a copy reloc. */
1006 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1009 /* We must allocate the symbol in our .dynbss section, which will
1010 become part of the .bss section of the executable. There will be
1011 an entry for this symbol in the .dynsym section. The dynamic
1012 object will contain position independent code, so all references
1013 from the dynamic object to this symbol will go through the global
1014 offset table. The dynamic linker will use the .dynsym entry to
1015 determine the address it must put in the global offset table, so
1016 both the dynamic object and the regular object will refer to the
1017 same memory location for the variable. */
1019 s = bfd_get_section_by_name (dynobj, ".dynbss");
1020 BFD_ASSERT (s != NULL);
1022 /* We must generate a R_390_COPY reloc to tell the dynamic linker
1023 to copy the initial value out of the dynamic object and into the
1024 runtime process image. We need to remember the offset into the
1025 .rel.bss section we are going to use. */
1026 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1030 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1031 BFD_ASSERT (srel != NULL);
1032 srel->_raw_size += sizeof (Elf64_External_Rela);
1033 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1036 /* We need to figure out the alignment required for this symbol. I
1037 have no idea how ELF linkers handle this. */
1038 power_of_two = bfd_log2 (h->size);
1039 if (power_of_two > 3)
1042 /* Apply the required alignment. */
1043 s->_raw_size = BFD_ALIGN (s->_raw_size,
1044 (bfd_size_type) (1 << power_of_two));
1045 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1047 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1051 /* Define the symbol as being at this point in the section. */
1052 h->root.u.def.section = s;
1053 h->root.u.def.value = s->_raw_size;
1055 /* Increment the section size to make room for the symbol. */
1056 s->_raw_size += h->size;
1061 /* Set the sizes of the dynamic sections. */
1064 elf_s390_size_dynamic_sections (output_bfd, info)
1065 bfd *output_bfd ATTRIBUTE_UNUSED;
1066 struct bfd_link_info *info;
1073 dynobj = elf_hash_table (info)->dynobj;
1074 BFD_ASSERT (dynobj != NULL);
1076 if (elf_hash_table (info)->dynamic_sections_created)
1078 /* Set the contents of the .interp section to the interpreter. */
1081 s = bfd_get_section_by_name (dynobj, ".interp");
1082 BFD_ASSERT (s != NULL);
1083 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1084 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1089 /* We may have created entries in the .rela.got section.
1090 However, if we are not creating the dynamic sections, we will
1091 not actually use these entries. Reset the size of .rela.got,
1092 which will cause it to get stripped from the output file
1094 s = bfd_get_section_by_name (dynobj, ".rela.got");
1099 /* If this is a -Bsymbolic shared link, then we need to discard all
1100 PC relative relocs against symbols defined in a regular object.
1101 We allocated space for them in the check_relocs routine, but we
1102 will not fill them in in the relocate_section routine. */
1104 elf_s390_link_hash_traverse (elf_s390_hash_table (info),
1105 elf_s390_discard_copies,
1108 /* The check_relocs and adjust_dynamic_symbol entry points have
1109 determined the sizes of the various dynamic sections. Allocate
1113 for (s = dynobj->sections; s != NULL; s = s->next)
1118 if ((s->flags & SEC_LINKER_CREATED) == 0)
1121 /* It's OK to base decisions on the section name, because none
1122 of the dynobj section names depend upon the input files. */
1123 name = bfd_get_section_name (dynobj, s);
1127 if (strcmp (name, ".plt") == 0)
1129 if (s->_raw_size == 0)
1131 /* Strip this section if we don't need it; see the
1137 /* Remember whether there is a PLT. */
1141 else if (strncmp (name, ".rela", 5) == 0)
1143 if (s->_raw_size == 0)
1145 /* If we don't need this section, strip it from the
1146 output file. This is to handle .rela.bss and
1147 .rel.plt. We must create it in
1148 create_dynamic_sections, because it must be created
1149 before the linker maps input sections to output
1150 sections. The linker does that before
1151 adjust_dynamic_symbol is called, and it is that
1152 function which decides whether anything needs to go
1153 into these sections. */
1158 /* Remember whether there are any reloc sections other
1160 if (strcmp (name, ".rela.plt") != 0)
1163 /* We use the reloc_count field as a counter if we need
1164 to copy relocs into the output file. */
1168 else if (strncmp (name, ".got", 4) != 0)
1170 /* It's not one of our sections, so don't allocate space. */
1176 _bfd_strip_section_from_output (info, s);
1180 /* Allocate memory for the section contents. */
1181 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
1182 if (s->contents == NULL && s->_raw_size != 0)
1186 if (elf_hash_table (info)->dynamic_sections_created)
1188 /* Add some entries to the .dynamic section. We fill in the
1189 values later, in elf_s390_finish_dynamic_sections, but we
1190 must add the entries now so that we get the correct size for
1191 the .dynamic section. The DT_DEBUG entry is filled in by the
1192 dynamic linker and used by the debugger. */
1193 #define add_dynamic_entry(TAG, VAL) \
1194 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1198 if (!add_dynamic_entry (DT_DEBUG, 0))
1204 if (!add_dynamic_entry (DT_PLTGOT, 0)
1205 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1206 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1207 || !add_dynamic_entry (DT_JMPREL, 0))
1213 if (!add_dynamic_entry (DT_RELA, 0)
1214 || !add_dynamic_entry (DT_RELASZ, 0)
1215 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
1219 if ((info->flags & DF_TEXTREL) != 0)
1221 if (!add_dynamic_entry (DT_TEXTREL, 0))
1223 info->flags |= DF_TEXTREL;
1226 #undef add_dynamic_entry
1231 /* This function is called via elf64_s390_link_hash_traverse if we are
1232 creating a shared object with -Bsymbolic. It discards the space
1233 allocated to copy PC relative relocs against symbols which are
1234 defined in regular objects. We allocated space for them in the
1235 check_relocs routine, but we won't fill them in in the
1236 relocate_section routine. */
1240 elf_s390_discard_copies (h, inf)
1241 struct elf_s390_link_hash_entry *h;
1244 struct elf_s390_pcrel_relocs_copied *s;
1245 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1247 /* If a symbol has been forced local or we have found a regular
1248 definition for the symbolic link case, then we won't be needing
1250 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1251 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1254 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1255 s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela);
1260 /* Relocate a 390 ELF section. */
1263 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1264 contents, relocs, local_syms, local_sections)
1266 struct bfd_link_info *info;
1268 asection *input_section;
1270 Elf_Internal_Rela *relocs;
1271 Elf_Internal_Sym *local_syms;
1272 asection **local_sections;
1275 Elf_Internal_Shdr *symtab_hdr;
1276 struct elf_link_hash_entry **sym_hashes;
1277 bfd_vma *local_got_offsets;
1281 Elf_Internal_Rela *rel;
1282 Elf_Internal_Rela *relend;
1284 dynobj = elf_hash_table (info)->dynobj;
1285 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1286 sym_hashes = elf_sym_hashes (input_bfd);
1287 local_got_offsets = elf_local_got_offsets (input_bfd);
1294 splt = bfd_get_section_by_name (dynobj, ".plt");
1295 sgot = bfd_get_section_by_name (dynobj, ".got");
1299 relend = relocs + input_section->reloc_count;
1300 for (; rel < relend; rel++)
1303 reloc_howto_type *howto;
1304 unsigned long r_symndx;
1305 struct elf_link_hash_entry *h;
1306 Elf_Internal_Sym *sym;
1309 bfd_reloc_status_type r;
1311 r_type = ELF64_R_TYPE (rel->r_info);
1312 if (r_type == R_390_GNU_VTINHERIT
1313 || r_type == R_390_GNU_VTENTRY)
1315 if (r_type < 0 || r_type >= (int) R_390_max)
1317 bfd_set_error (bfd_error_bad_value);
1320 howto = elf_howto_table + r_type;
1322 r_symndx = ELF64_R_SYM (rel->r_info);
1324 if (info->relocateable)
1326 /* This is a relocateable link. We don't have to change
1327 anything, unless the reloc is against a section symbol,
1328 in which case we have to adjust according to where the
1329 section symbol winds up in the output section. */
1330 if (r_symndx < symtab_hdr->sh_info)
1332 sym = local_syms + r_symndx;
1333 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1335 sec = local_sections[r_symndx];
1336 rel->r_addend += sec->output_offset + sym->st_value;
1343 /* This is a final link. */
1347 if (r_symndx < symtab_hdr->sh_info)
1349 sym = local_syms + r_symndx;
1350 sec = local_sections[r_symndx];
1351 relocation = (sec->output_section->vma
1352 + sec->output_offset
1357 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1358 while (h->root.type == bfd_link_hash_indirect
1359 || h->root.type == bfd_link_hash_warning)
1360 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1361 if (h->root.type == bfd_link_hash_defined
1362 || h->root.type == bfd_link_hash_defweak)
1364 sec = h->root.u.def.section;
1365 if ((r_type == R_390_GOTPC
1366 || r_type == R_390_GOTPCDBL)
1367 || ((r_type == R_390_PLT16DBL ||
1368 r_type == R_390_PLT32 ||
1369 r_type == R_390_PLT32DBL ||
1370 r_type == R_390_PLT64)
1372 && h->plt.offset != (bfd_vma) -1)
1373 || ((r_type == R_390_GOT12 ||
1374 r_type == R_390_GOT16 ||
1375 r_type == R_390_GOT32 ||
1376 r_type == R_390_GOT64 ||
1377 r_type == R_390_GOTENT)
1378 && elf_hash_table (info)->dynamic_sections_created
1380 || (! info->symbolic && h->dynindx != -1)
1381 || (h->elf_link_hash_flags
1382 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1384 && ((! info->symbolic && h->dynindx != -1)
1385 || (h->elf_link_hash_flags
1386 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1387 && ( r_type == R_390_8 ||
1388 r_type == R_390_16 ||
1389 r_type == R_390_32 ||
1390 r_type == R_390_64 ||
1391 r_type == R_390_PC16 ||
1392 r_type == R_390_PC16DBL ||
1393 r_type == R_390_PC32 ||
1394 r_type == R_390_PC32DBL ||
1395 r_type == R_390_PC64)
1396 && ((input_section->flags & SEC_ALLOC) != 0
1397 /* DWARF will emit R_386_32 relocations in its
1398 sections against symbols defined externally
1399 in shared libraries. We can't do anything
1401 || ((input_section->flags & SEC_DEBUGGING) != 0
1402 && (h->elf_link_hash_flags
1403 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
1405 /* In these cases, we don't need the relocation
1406 value. We check specially because in some
1407 obscure cases sec->output_section will be NULL. */
1410 else if (sec->output_section == NULL)
1412 (*_bfd_error_handler)
1413 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
1414 bfd_archive_filename (input_bfd), h->root.root.string,
1415 bfd_get_section_name (input_bfd, input_section));
1419 relocation = (h->root.u.def.value
1420 + sec->output_section->vma
1421 + sec->output_offset);
1423 else if (h->root.type == bfd_link_hash_undefweak)
1425 else if (info->shared
1426 && (!info->symbolic || info->allow_shlib_undefined)
1427 && !info->no_undefined
1428 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1432 if (! ((*info->callbacks->undefined_symbol)
1433 (info, h->root.root.string, input_bfd,
1434 input_section, rel->r_offset,
1435 (!info->shared || info->no_undefined
1436 || ELF_ST_VISIBILITY (h->other)))))
1449 /* Relocation is to the entry for this symbol in the global
1451 BFD_ASSERT (sgot != NULL);
1457 off = h->got.offset;
1458 BFD_ASSERT (off != (bfd_vma) -1);
1460 if (! elf_hash_table (info)->dynamic_sections_created
1462 && (info->symbolic || h->dynindx == -1)
1463 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1465 /* This is actually a static link, or it is a
1466 -Bsymbolic link and the symbol is defined
1467 locally, or the symbol was forced to be local
1468 because of a version file. We must initialize
1469 this entry in the global offset table. Since the
1470 offset must always be a multiple of 2, we use the
1471 least significant bit to record whether we have
1472 initialized it already.
1474 When doing a dynamic link, we create a .rel.got
1475 relocation entry to initialize the value. This
1476 is done in the finish_dynamic_symbol routine. */
1481 bfd_put_64 (output_bfd, relocation,
1482 sgot->contents + off);
1486 relocation = sgot->output_offset + off;
1492 BFD_ASSERT (local_got_offsets != NULL
1493 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1495 off = local_got_offsets[r_symndx];
1497 /* The offset must always be a multiple of 8. We use
1498 the least significant bit to record whether we have
1499 already generated the necessary reloc. */
1504 bfd_put_64 (output_bfd, relocation, sgot->contents + off);
1509 Elf_Internal_Rela outrel;
1511 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1512 BFD_ASSERT (srelgot != NULL);
1514 outrel.r_offset = (sgot->output_section->vma
1515 + sgot->output_offset
1517 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1518 outrel.r_addend = relocation;
1519 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1520 (((Elf64_External_Rela *)
1522 + srelgot->reloc_count));
1523 ++srelgot->reloc_count;
1526 local_got_offsets[r_symndx] |= 1;
1529 relocation = sgot->output_offset + off;
1533 * For @GOTENT the relocation is against the offset between
1534 * the instruction and the symbols entry in the GOT and not
1535 * between the start of the GOT and the symbols entry. We
1536 * add the vma of the GOT to get the correct value.
1538 if (r_type == R_390_GOTENT)
1539 relocation += sgot->output_section->vma;
1544 /* Relocation is relative to the start of the global offset
1549 sgot = bfd_get_section_by_name (dynobj, ".got");
1550 BFD_ASSERT (sgot != NULL);
1553 /* Note that sgot->output_offset is not involved in this
1554 calculation. We always want the start of .got. If we
1555 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1556 permitted by the ABI, we might have to change this
1558 relocation -= sgot->output_section->vma;
1563 case R_390_GOTPCDBL:
1564 /* Use global offset table as symbol value. */
1568 sgot = bfd_get_section_by_name (dynobj, ".got");
1569 BFD_ASSERT (sgot != NULL);
1572 relocation = sgot->output_section->vma;
1576 case R_390_PLT16DBL:
1578 case R_390_PLT32DBL:
1580 /* Relocation is to the entry for this symbol in the
1581 procedure linkage table. */
1583 /* Resolve a PLT32 reloc against a local symbol directly,
1584 without using the procedure linkage table. */
1588 if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
1590 /* We didn't make a PLT entry for this symbol. This
1591 happens when statically linking PIC code, or when
1592 using -Bsymbolic. */
1596 relocation = (splt->output_section->vma
1597 + splt->output_offset
1612 && (input_section->flags & SEC_ALLOC) != 0
1613 && (r_type == R_390_8
1614 || r_type == R_390_16
1615 || r_type == R_390_32
1616 || r_type == R_390_64
1619 && (! info->symbolic
1620 || (h->elf_link_hash_flags
1621 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1623 Elf_Internal_Rela outrel;
1624 boolean skip, relocate;
1626 /* When generating a shared object, these relocations
1627 are copied into the output file to be resolved at run
1634 name = (bfd_elf_string_from_elf_section
1636 elf_elfheader (input_bfd)->e_shstrndx,
1637 elf_section_data (input_section)->rel_hdr.sh_name));
1641 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1642 && strcmp (bfd_get_section_name (input_bfd,
1646 sreloc = bfd_get_section_by_name (dynobj, name);
1647 BFD_ASSERT (sreloc != NULL);
1652 if (elf_section_data (input_section)->stab_info == NULL)
1653 outrel.r_offset = rel->r_offset;
1658 off = (_bfd_stab_section_offset
1659 (output_bfd, &elf_hash_table (info)->stab_info,
1661 &elf_section_data (input_section)->stab_info,
1663 if (off == (bfd_vma) -1)
1665 outrel.r_offset = off;
1668 outrel.r_offset += (input_section->output_section->vma
1669 + input_section->output_offset);
1673 memset (&outrel, 0, sizeof outrel);
1676 else if (r_type == R_390_PC16 ||
1677 r_type == R_390_PC16DBL ||
1678 r_type == R_390_PC32 ||
1679 r_type == R_390_PC32DBL ||
1680 r_type == R_390_PC64)
1682 BFD_ASSERT (h != NULL && h->dynindx != -1);
1684 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
1685 outrel.r_addend = relocation + rel->r_addend;
1689 /* h->dynindx may be -1 if this symbol was marked to
1692 || ((info->symbolic || h->dynindx == -1)
1693 && (h->elf_link_hash_flags
1694 & ELF_LINK_HASH_DEF_REGULAR) != 0))
1697 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1698 outrel.r_addend = relocation + rel->r_addend;
1702 BFD_ASSERT (h->dynindx != -1);
1704 outrel.r_info = ELF64_R_INFO (h->dynindx, R_390_64);
1705 outrel.r_addend = relocation + rel->r_addend;
1709 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1710 (((Elf64_External_Rela *)
1712 + sreloc->reloc_count));
1713 ++sreloc->reloc_count;
1715 /* If this reloc is against an external symbol, we do
1716 not want to fiddle with the addend. Otherwise, we
1717 need to include the symbol value so that it becomes
1718 an addend for the dynamic reloc. */
1729 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1730 contents, rel->r_offset,
1731 relocation, rel->r_addend);
1733 if (r != bfd_reloc_ok)
1738 case bfd_reloc_outofrange:
1740 case bfd_reloc_overflow:
1745 name = h->root.root.string;
1748 name = bfd_elf_string_from_elf_section (input_bfd,
1749 symtab_hdr->sh_link,
1754 name = bfd_section_name (input_bfd, sec);
1756 if (! ((*info->callbacks->reloc_overflow)
1757 (info, name, howto->name, (bfd_vma) 0,
1758 input_bfd, input_section, rel->r_offset)))
1769 /* Finish up dynamic symbol handling. We set the contents of various
1770 dynamic sections here. */
1773 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
1775 struct bfd_link_info *info;
1776 struct elf_link_hash_entry *h;
1777 Elf_Internal_Sym *sym;
1781 dynobj = elf_hash_table (info)->dynobj;
1783 if (h->plt.offset != (bfd_vma) -1)
1787 Elf_Internal_Rela rela;
1792 /* This symbol has an entry in the procedure linkage table. Set
1795 BFD_ASSERT (h->dynindx != -1);
1797 splt = bfd_get_section_by_name (dynobj, ".plt");
1798 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1799 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1800 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1803 Current offset - size first entry / entry size. */
1804 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
1806 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
1808 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
1810 /* Fill in the blueprint of a PLT. */
1811 bfd_put_32 (output_bfd, PLT_ENTRY_WORD0,
1812 splt->contents + h->plt.offset);
1813 bfd_put_32 (output_bfd, PLT_ENTRY_WORD1,
1814 splt->contents + h->plt.offset + 4);
1815 bfd_put_32 (output_bfd, PLT_ENTRY_WORD2,
1816 splt->contents + h->plt.offset + 8);
1817 bfd_put_32 (output_bfd, PLT_ENTRY_WORD3,
1818 splt->contents + h->plt.offset + 12);
1819 bfd_put_32 (output_bfd, PLT_ENTRY_WORD4,
1820 splt->contents + h->plt.offset + 16);
1821 bfd_put_32 (output_bfd, PLT_ENTRY_WORD5,
1822 splt->contents + h->plt.offset + 20);
1823 bfd_put_32 (output_bfd, PLT_ENTRY_WORD6,
1824 splt->contents + h->plt.offset + 24);
1825 bfd_put_32 (output_bfd, PLT_ENTRY_WORD7,
1826 splt->contents + h->plt.offset + 28);
1827 /* Fixup the relative address to the GOT entry */
1828 bfd_put_32 (output_bfd,
1829 (sgot->output_section->vma + sgot->output_offset + got_offset
1830 - (splt->output_section->vma + h->plt.offset))/2,
1831 splt->contents + h->plt.offset + 2);
1832 /* Fixup the relative branch to PLT 0 */
1833 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
1834 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
1835 splt->contents + h->plt.offset + 24);
1836 /* Fixup offset into symbol table */
1837 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
1838 splt->contents + h->plt.offset + 28);
1840 /* Fill in the entry in the .rela.plt section. */
1841 rela.r_offset = (sgot->output_section->vma
1842 + sgot->output_offset
1844 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
1846 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1847 ((Elf64_External_Rela *) srela->contents
1850 /* Fill in the entry in the global offset table.
1851 Points to instruction after GOT offset. */
1852 bfd_put_64 (output_bfd,
1853 (splt->output_section->vma
1854 + splt->output_offset
1857 sgot->contents + got_offset);
1860 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1862 /* Mark the symbol as undefined, rather than as defined in
1863 the .plt section. Leave the value alone. */
1864 sym->st_shndx = SHN_UNDEF;
1868 if (h->got.offset != (bfd_vma) -1)
1872 Elf_Internal_Rela rela;
1874 /* This symbol has an entry in the global offset table. Set it
1877 sgot = bfd_get_section_by_name (dynobj, ".got");
1878 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1879 BFD_ASSERT (sgot != NULL && srela != NULL);
1881 rela.r_offset = (sgot->output_section->vma
1882 + sgot->output_offset
1883 + (h->got.offset &~ (bfd_vma) 1));
1885 /* If this is a static link, or it is a -Bsymbolic link and the
1886 symbol is defined locally or was forced to be local because
1887 of a version file, we just want to emit a RELATIVE reloc.
1888 The entry in the global offset table will already have been
1889 initialized in the relocate_section function. */
1890 if (! elf_hash_table (info)->dynamic_sections_created
1892 && (info->symbolic || h->dynindx == -1)
1893 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1895 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1896 rela.r_addend = (h->root.u.def.value
1897 + h->root.u.def.section->output_section->vma
1898 + h->root.u.def.section->output_offset);
1902 BFD_ASSERT((h->got.offset & 1) == 0);
1903 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1904 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
1908 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1909 ((Elf64_External_Rela *) srela->contents
1910 + srela->reloc_count));
1911 ++srela->reloc_count;
1914 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1917 Elf_Internal_Rela rela;
1919 /* This symbols needs a copy reloc. Set it up. */
1921 BFD_ASSERT (h->dynindx != -1
1922 && (h->root.type == bfd_link_hash_defined
1923 || h->root.type == bfd_link_hash_defweak));
1926 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1928 BFD_ASSERT (s != NULL);
1930 rela.r_offset = (h->root.u.def.value
1931 + h->root.u.def.section->output_section->vma
1932 + h->root.u.def.section->output_offset);
1933 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
1935 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1936 ((Elf64_External_Rela *) s->contents
1941 /* Mark some specially defined symbols as absolute. */
1942 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1943 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
1944 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
1945 sym->st_shndx = SHN_ABS;
1950 /* Finish up the dynamic sections. */
1953 elf_s390_finish_dynamic_sections (output_bfd, info)
1955 struct bfd_link_info *info;
1961 dynobj = elf_hash_table (info)->dynobj;
1963 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1964 BFD_ASSERT (sgot != NULL);
1965 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1967 if (elf_hash_table (info)->dynamic_sections_created)
1970 Elf64_External_Dyn *dyncon, *dynconend;
1972 BFD_ASSERT (sdyn != NULL);
1974 dyncon = (Elf64_External_Dyn *) sdyn->contents;
1975 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1976 for (; dyncon < dynconend; dyncon++)
1978 Elf_Internal_Dyn dyn;
1982 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
1995 s = bfd_get_section_by_name(output_bfd, name);
1996 BFD_ASSERT (s != NULL);
1997 dyn.d_un.d_ptr = s->vma;
1998 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2002 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2003 BFD_ASSERT (s != NULL);
2004 if (s->_cooked_size != 0)
2005 dyn.d_un.d_val = s->_cooked_size;
2007 dyn.d_un.d_val = s->_raw_size;
2008 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2012 /* The procedure linkage table relocs (DT_JMPREL) should
2013 not be included in the overall relocs (DT_RELA).
2014 Therefore, we override the DT_RELASZ entry here to
2015 make it not include the JMPREL relocs. Since the
2016 linker script arranges for .rela.plt to follow all
2017 other relocation sections, we don't have to worry
2018 about changing the DT_RELA entry. */
2019 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2022 if (s->_cooked_size != 0)
2023 dyn.d_un.d_val -= s->_cooked_size;
2025 dyn.d_un.d_val -= s->_raw_size;
2027 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2032 /* Fill in the special first entry in the procedure linkage table. */
2033 splt = bfd_get_section_by_name (dynobj, ".plt");
2034 if (splt && splt->_raw_size > 0)
2036 /* fill in blueprint for plt 0 entry */
2037 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD0,
2039 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD1,
2040 splt->contents +4 );
2041 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD3,
2042 splt->contents +12 );
2043 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD4,
2044 splt->contents +16 );
2045 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD5,
2046 splt->contents +20 );
2047 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD6,
2048 splt->contents + 24);
2049 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD7,
2050 splt->contents + 28 );
2051 /* Fixup relative address to start of GOT */
2052 bfd_put_32 (output_bfd,
2053 (sgot->output_section->vma + sgot->output_offset
2054 - splt->output_section->vma - 6)/2,
2055 splt->contents + 8);
2058 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
2062 /* Set the first entry in the global offset table to the address of
2063 the dynamic section. */
2064 if (sgot->_raw_size > 0)
2067 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents);
2069 bfd_put_64 (output_bfd,
2070 sdyn->output_section->vma + sdyn->output_offset,
2073 /* One entry for shared object struct ptr. */
2074 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2075 /* One entry for _dl_runtime_resolve. */
2076 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 12);
2079 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 8;
2085 elf_s390_object_p (abfd)
2088 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esame);
2092 static enum elf_reloc_type_class
2093 elf_s390_reloc_type_class (rela)
2094 const Elf_Internal_Rela *rela;
2096 switch ((int) ELF64_R_TYPE (rela->r_info))
2098 case R_390_RELATIVE:
2099 return reloc_class_relative;
2100 case R_390_JMP_SLOT:
2101 return reloc_class_plt;
2103 return reloc_class_copy;
2105 return reloc_class_normal;
2110 * Why was the hash table entry size definition changed from
2111 * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
2112 * this is the only reason for the s390_elf64_size_info structure.
2115 const struct elf_size_info s390_elf64_size_info =
2117 sizeof (Elf64_External_Ehdr),
2118 sizeof (Elf64_External_Phdr),
2119 sizeof (Elf64_External_Shdr),
2120 sizeof (Elf64_External_Rel),
2121 sizeof (Elf64_External_Rela),
2122 sizeof (Elf64_External_Sym),
2123 sizeof (Elf64_External_Dyn),
2124 sizeof (Elf_External_Note),
2125 8, /* hash-table entry size */
2126 1, /* internal relocations per external relocations */
2129 ELFCLASS64, EV_CURRENT,
2130 bfd_elf64_write_out_phdrs,
2131 bfd_elf64_write_shdrs_and_ehdr,
2132 bfd_elf64_write_relocs,
2133 bfd_elf64_swap_symbol_out,
2134 bfd_elf64_slurp_reloc_table,
2135 bfd_elf64_slurp_symbol_table,
2136 bfd_elf64_swap_dyn_in,
2137 bfd_elf64_swap_dyn_out,
2144 #define TARGET_BIG_SYM bfd_elf64_s390_vec
2145 #define TARGET_BIG_NAME "elf64-s390"
2146 #define ELF_ARCH bfd_arch_s390
2147 #define ELF_MACHINE_CODE EM_S390
2148 #define ELF_MACHINE_ALT1 EM_S390_OLD
2149 #define ELF_MAXPAGESIZE 0x1000
2151 #define elf_backend_size_info s390_elf64_size_info
2153 #define elf_backend_can_gc_sections 1
2154 #define elf_backend_can_refcount 1
2155 #define elf_backend_want_got_plt 1
2156 #define elf_backend_plt_readonly 1
2157 #define elf_backend_want_plt_sym 0
2158 #define elf_backend_got_header_size 24
2159 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
2161 #define elf_info_to_howto elf_s390_info_to_howto
2163 #define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link
2164 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
2165 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
2166 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2168 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2169 #define elf_backend_check_relocs elf_s390_check_relocs
2170 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
2171 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2172 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2173 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2174 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
2175 #define elf_backend_relocate_section elf_s390_relocate_section
2176 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
2177 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
2179 #define elf_backend_object_p elf_s390_object_p
2181 #include "elf64-target.h"