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[deliverable/binutils-gdb.git] / bfd / elf32-sparc.c
1 /* SPARC-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20 #include "bfd.h"
21 #include "sysdep.h"
22 #include "bfdlink.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25
26 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
27 PARAMS ((bfd *, bfd_reloc_code_real_type));
28 static void elf_info_to_howto
29 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
30 static boolean elf32_sparc_check_relocs
31 PARAMS ((bfd *, struct bfd_link_info *, asection *,
32 const Elf_Internal_Rela *));
33 static boolean elf32_sparc_adjust_dynamic_symbol
34 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
35 static boolean elf32_sparc_adjust_dynindx
36 PARAMS ((struct elf_link_hash_entry *, PTR));
37 static boolean elf32_sparc_size_dynamic_sections
38 PARAMS ((bfd *, struct bfd_link_info *));
39 static boolean elf32_sparc_relocate_section
40 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
41 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
42 static boolean elf32_sparc_finish_dynamic_symbol
43 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
44 Elf_Internal_Sym *));
45 static boolean elf32_sparc_finish_dynamic_sections
46 PARAMS ((bfd *, struct bfd_link_info *));
47
48 enum reloc_type
49 {
50 R_SPARC_NONE = 0,
51 R_SPARC_8, R_SPARC_16, R_SPARC_32,
52 R_SPARC_DISP8, R_SPARC_DISP16, R_SPARC_DISP32,
53 R_SPARC_WDISP30, R_SPARC_WDISP22,
54 R_SPARC_HI22, R_SPARC_22,
55 R_SPARC_13, R_SPARC_LO10,
56 R_SPARC_GOT10, R_SPARC_GOT13, R_SPARC_GOT22,
57 R_SPARC_PC10, R_SPARC_PC22,
58 R_SPARC_WPLT30,
59 R_SPARC_COPY,
60 R_SPARC_GLOB_DAT, R_SPARC_JMP_SLOT,
61 R_SPARC_RELATIVE,
62 R_SPARC_UA32,
63 R_SPARC_max
64 };
65
66 #if 0
67 static CONST char *CONST reloc_type_names[] =
68 {
69 "R_SPARC_NONE",
70 "R_SPARC_8", "R_SPARC_16", "R_SPARC_32",
71 "R_SPARC_DISP8", "R_SPARC_DISP16", "R_SPARC_DISP32",
72 "R_SPARC_WDISP30", "R_SPARC_WDISP22",
73 "R_SPARC_HI22", "R_SPARC_22",
74 "R_SPARC_13", "R_SPARC_LO10",
75 "R_SPARC_GOT10", "R_SPARC_GOT13", "R_SPARC_GOT22",
76 "R_SPARC_PC10", "R_SPARC_PC22",
77 "R_SPARC_WPLT30",
78 "R_SPARC_COPY",
79 "R_SPARC_GLOB_DAT", "R_SPARC_JMP_SLOT",
80 "R_SPARC_RELATIVE",
81 "R_SPARC_UA32",
82 };
83 #endif
84
85 static reloc_howto_type elf_sparc_howto_table[] =
86 {
87 HOWTO(R_SPARC_NONE, 0,0, 0,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_NONE", false,0,0x00000000,true),
88 HOWTO(R_SPARC_8, 0,0, 8,false,0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_8", false,0,0x000000ff,true),
89 HOWTO(R_SPARC_16, 0,1,16,false,0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_16", false,0,0x0000ffff,true),
90 HOWTO(R_SPARC_32, 0,2,32,false,0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_32", false,0,0xffffffff,true),
91 HOWTO(R_SPARC_DISP8, 0,0, 8,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_DISP8", false,0,0x000000ff,true),
92 HOWTO(R_SPARC_DISP16, 0,1,16,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_DISP16", false,0,0x0000ffff,true),
93 HOWTO(R_SPARC_DISP32, 0,2,32,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_DISP32", false,0,0x00ffffff,true),
94 HOWTO(R_SPARC_WDISP30, 2,2,30,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_WDISP30", false,0,0x3fffffff,true),
95 HOWTO(R_SPARC_WDISP22, 2,2,22,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_WDISP22", false,0,0x003fffff,true),
96 HOWTO(R_SPARC_HI22, 10,2,22,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_HI22", false,0,0x003fffff,true),
97 HOWTO(R_SPARC_22, 0,2,22,false,0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_22", false,0,0x003fffff,true),
98 HOWTO(R_SPARC_13, 0,2,13,false,0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_13", false,0,0x00001fff,true),
99 HOWTO(R_SPARC_LO10, 0,2,10,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_LO10", false,0,0x000003ff,true),
100 HOWTO(R_SPARC_GOT10, 0,2,10,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_GOT10", false,0,0x000003ff,true),
101 HOWTO(R_SPARC_GOT13, 0,2,13,false,0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_GOT13", false,0,0x00001fff,true),
102 HOWTO(R_SPARC_GOT22, 10,2,22,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_GOT22", false,0,0x003fffff,true),
103 HOWTO(R_SPARC_PC10, 0,2,10,true, 0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_PC10", false,0,0x000003ff,true),
104 HOWTO(R_SPARC_PC22, 10,2,22,true, 0,complain_overflow_bitfield,bfd_elf_generic_reloc,"R_SPARC_PC22", false,0,0x003fffff,true),
105 HOWTO(R_SPARC_WPLT30, 2,2,30,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_SPARC_WPLT30", false,0,0x3fffffff,true),
106 HOWTO(R_SPARC_COPY, 0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_COPY", false,0,0x00000000,true),
107 HOWTO(R_SPARC_GLOB_DAT,0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_GLOB_DAT",false,0,0x00000000,true),
108 HOWTO(R_SPARC_JMP_SLOT,0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_JMP_SLOT",false,0,0x00000000,true),
109 HOWTO(R_SPARC_RELATIVE,0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_RELATIVE",false,0,0x00000000,true),
110 HOWTO(R_SPARC_UA32, 0,0,00,false,0,complain_overflow_dont, bfd_elf_generic_reloc,"R_SPARC_UA32", false,0,0x00000000,true),
111 };
112
113 struct elf_reloc_map {
114 unsigned char bfd_reloc_val;
115 unsigned char elf_reloc_val;
116 };
117
118 static CONST struct elf_reloc_map sparc_reloc_map[] =
119 {
120 { BFD_RELOC_NONE, R_SPARC_NONE, },
121 { BFD_RELOC_16, R_SPARC_16, },
122 { BFD_RELOC_8, R_SPARC_8 },
123 { BFD_RELOC_8_PCREL, R_SPARC_DISP8 },
124 { BFD_RELOC_CTOR, R_SPARC_32 }, /* @@ Assumes 32 bits. */
125 { BFD_RELOC_32, R_SPARC_32 },
126 { BFD_RELOC_32_PCREL, R_SPARC_DISP32 },
127 { BFD_RELOC_HI22, R_SPARC_HI22 },
128 { BFD_RELOC_LO10, R_SPARC_LO10, },
129 { BFD_RELOC_32_PCREL_S2, R_SPARC_WDISP30 },
130 { BFD_RELOC_SPARC22, R_SPARC_22 },
131 { BFD_RELOC_SPARC13, R_SPARC_13 },
132 { BFD_RELOC_SPARC_GOT10, R_SPARC_GOT10 },
133 { BFD_RELOC_SPARC_GOT13, R_SPARC_GOT13 },
134 { BFD_RELOC_SPARC_GOT22, R_SPARC_GOT22 },
135 { BFD_RELOC_SPARC_PC10, R_SPARC_PC10 },
136 { BFD_RELOC_SPARC_PC22, R_SPARC_PC22 },
137 { BFD_RELOC_SPARC_WPLT30, R_SPARC_WPLT30 },
138 { BFD_RELOC_SPARC_COPY, R_SPARC_COPY },
139 { BFD_RELOC_SPARC_GLOB_DAT, R_SPARC_GLOB_DAT },
140 { BFD_RELOC_SPARC_JMP_SLOT, R_SPARC_JMP_SLOT },
141 { BFD_RELOC_SPARC_RELATIVE, R_SPARC_RELATIVE },
142 { BFD_RELOC_SPARC_WDISP22, R_SPARC_WDISP22 },
143 /*{ BFD_RELOC_SPARC_UA32, R_SPARC_UA32 }, not used?? */
144 };
145
146 static reloc_howto_type *
147 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
148 bfd *abfd;
149 bfd_reloc_code_real_type code;
150 {
151 unsigned int i;
152 for (i = 0; i < sizeof (sparc_reloc_map) / sizeof (struct elf_reloc_map); i++)
153 {
154 if (sparc_reloc_map[i].bfd_reloc_val == code)
155 return &elf_sparc_howto_table[(int) sparc_reloc_map[i].elf_reloc_val];
156 }
157 return 0;
158 }
159
160 static void
161 elf_info_to_howto (abfd, cache_ptr, dst)
162 bfd *abfd;
163 arelent *cache_ptr;
164 Elf_Internal_Rela *dst;
165 {
166 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_SPARC_max);
167 cache_ptr->howto = &elf_sparc_howto_table[ELF32_R_TYPE(dst->r_info)];
168 }
169
170 \f
171 /* Functions for the SPARC ELF linker. */
172
173 /* The name of the dynamic interpreter. This is put in the .interp
174 section. */
175
176 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
177
178 /* The nop opcode we use. */
179
180 #define SPARC_NOP 0x01000000
181
182 /* The size in bytes of an entry in the procedure linkage table. */
183
184 #define PLT_ENTRY_SIZE 12
185
186 /* The first four entries in a procedure linkage table are reserved,
187 and the initial contents are unimportant (we zero them out).
188 Subsequent entries look like this. See the SVR4 ABI SPARC
189 supplement to see how this works. */
190
191 /* sethi %hi(.-.plt0),%g1. We fill in the address later. */
192 #define PLT_ENTRY_WORD0 0x03000000
193 /* b,a .plt0. We fill in the offset later. */
194 #define PLT_ENTRY_WORD1 0x30800000
195 /* nop. */
196 #define PLT_ENTRY_WORD2 SPARC_NOP
197
198 /* Look through the relocs for a section during the first phase, and
199 allocate space in the global offset table or procedure linkage
200 table. */
201
202 static boolean
203 elf32_sparc_check_relocs (abfd, info, sec, relocs)
204 bfd *abfd;
205 struct bfd_link_info *info;
206 asection *sec;
207 const Elf_Internal_Rela *relocs;
208 {
209 bfd *dynobj;
210 Elf_Internal_Shdr *symtab_hdr;
211 struct elf_link_hash_entry **sym_hashes;
212 bfd_vma *local_got_offsets;
213 const Elf_Internal_Rela *rel;
214 const Elf_Internal_Rela *rel_end;
215 asection *sgot;
216 asection *srelgot;
217 asection *sreloc;
218
219 if (info->relocateable)
220 return true;
221
222 dynobj = elf_hash_table (info)->dynobj;
223 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
224 sym_hashes = elf_sym_hashes (abfd);
225 local_got_offsets = elf_local_got_offsets (abfd);
226
227 sgot = NULL;
228 srelgot = NULL;
229 sreloc = NULL;
230
231 rel_end = relocs + sec->reloc_count;
232 for (rel = relocs; rel < rel_end; rel++)
233 {
234 unsigned long r_symndx;
235 struct elf_link_hash_entry *h;
236
237 r_symndx = ELF32_R_SYM (rel->r_info);
238 if (r_symndx < symtab_hdr->sh_info)
239 h = NULL;
240 else
241 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
242
243 switch (ELF32_R_TYPE (rel->r_info))
244 {
245 case R_SPARC_GOT10:
246 case R_SPARC_GOT13:
247 case R_SPARC_GOT22:
248 /* This symbol requires a global offset table entry. */
249
250 if (dynobj == NULL)
251 {
252 /* Create the .got section. */
253 elf_hash_table (info)->dynobj = dynobj = abfd;
254 if (! _bfd_elf_create_got_section (dynobj, info))
255 return false;
256 }
257
258 if (sgot == NULL)
259 {
260 sgot = bfd_get_section_by_name (dynobj, ".got");
261 BFD_ASSERT (sgot != NULL);
262 }
263
264 if (srelgot == NULL
265 && (h != NULL || info->shared))
266 {
267 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
268 if (srelgot == NULL)
269 {
270 srelgot = bfd_make_section (dynobj, ".rela.got");
271 if (srelgot == NULL
272 || ! bfd_set_section_flags (dynobj, srelgot,
273 (SEC_ALLOC
274 | SEC_LOAD
275 | SEC_HAS_CONTENTS
276 | SEC_IN_MEMORY
277 | SEC_READONLY))
278 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
279 return false;
280 }
281 }
282
283 if (h != NULL)
284 {
285 if (h->got_offset != (bfd_vma) -1)
286 {
287 /* We have already allocated space in the .got. */
288 break;
289 }
290 h->got_offset = sgot->_raw_size;
291
292 /* Make sure this symbol is output as a dynamic symbol. */
293 if (h->dynindx == -1)
294 {
295 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
296 return false;
297 }
298
299 srelgot->_raw_size += sizeof (Elf32_External_Rela);
300 }
301 else
302 {
303 /* This is a global offset table entry for a local
304 symbol. */
305 if (local_got_offsets == NULL)
306 {
307 size_t size;
308 register unsigned int i;
309
310 size = symtab_hdr->sh_info * sizeof (bfd_vma);
311 local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size);
312 if (local_got_offsets == NULL)
313 {
314 bfd_set_error (bfd_error_no_memory);
315 return false;
316 }
317 elf_local_got_offsets (abfd) = local_got_offsets;
318 for (i = 0; i < symtab_hdr->sh_info; i++)
319 local_got_offsets[i] = (bfd_vma) -1;
320 }
321 if (local_got_offsets[r_symndx] != (bfd_vma) -1)
322 {
323 /* We have already allocated space in the .got. */
324 break;
325 }
326 local_got_offsets[r_symndx] = sgot->_raw_size;
327
328 if (info->shared)
329 {
330 /* If we are generating a shared object, we need to
331 output a R_SPARC_RELATIVE reloc so that the
332 dynamic linker can adjust this GOT entry. */
333 srelgot->_raw_size += sizeof (Elf32_External_Rela);
334 }
335 }
336
337 sgot->_raw_size += 4;
338
339 break;
340
341 case R_SPARC_WPLT30:
342 /* This symbol requires a procedure linkage table entry. We
343 actually build the entry in adjust_dynamic_symbol,
344 because this might be a case of linking PIC code without
345 linking in any dynamic objects, in which case we don't
346 need to generate a procedure linkage table after all. */
347
348 if (h == NULL)
349 {
350 /* It does not make sense to have a procedure linkage
351 table entry for a local symbol. */
352 bfd_set_error (bfd_error_bad_value);
353 return false;
354 }
355
356 /* Make sure this symbol is output as a dynamic symbol. */
357 if (h->dynindx == -1)
358 {
359 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
360 return false;
361 }
362
363 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
364
365 break;
366
367 case R_SPARC_PC10:
368 case R_SPARC_PC22:
369 if (h != NULL
370 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
371 break;
372 /* Fall through. */
373 case R_SPARC_DISP8:
374 case R_SPARC_DISP16:
375 case R_SPARC_DISP32:
376 case R_SPARC_WDISP30:
377 case R_SPARC_WDISP22:
378 if (h == NULL)
379 break;
380 /* Fall through. */
381 case R_SPARC_8:
382 case R_SPARC_16:
383 case R_SPARC_32:
384 case R_SPARC_HI22:
385 case R_SPARC_22:
386 case R_SPARC_13:
387 case R_SPARC_LO10:
388 case R_SPARC_UA32:
389 if (info->shared
390 && (sec->flags & SEC_ALLOC) != 0)
391 {
392 /* When creating a shared object, we must copy these
393 relocs into the output file. We create a reloc
394 section in dynobj and make room for the reloc. */
395 if (sreloc == NULL)
396 {
397 const char *name;
398
399 name = (bfd_elf_string_from_elf_section
400 (abfd,
401 elf_elfheader (abfd)->e_shstrndx,
402 elf_section_data (sec)->rel_hdr.sh_name));
403 if (name == NULL)
404 return false;
405
406 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
407 && strcmp (bfd_get_section_name (abfd, sec),
408 name + 5) == 0);
409
410 sreloc = bfd_get_section_by_name (dynobj, name);
411 if (sreloc == NULL)
412 {
413 sreloc = bfd_make_section (dynobj, name);
414 if (sreloc == NULL
415 || ! bfd_set_section_flags (dynobj, sreloc,
416 (SEC_ALLOC
417 | SEC_LOAD
418 | SEC_HAS_CONTENTS
419 | SEC_IN_MEMORY
420 | SEC_READONLY))
421 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
422 return false;
423 }
424 }
425
426 sreloc->_raw_size += sizeof (Elf32_External_Rela);
427 }
428
429 break;
430
431 default:
432 break;
433 }
434 }
435
436 return true;
437 }
438
439 /* Adjust a symbol defined by a dynamic object and referenced by a
440 regular object. The current definition is in some section of the
441 dynamic object, but we're not including those sections. We have to
442 change the definition to something the rest of the link can
443 understand. */
444
445 static boolean
446 elf32_sparc_adjust_dynamic_symbol (info, h)
447 struct bfd_link_info *info;
448 struct elf_link_hash_entry *h;
449 {
450 bfd *dynobj;
451 asection *s;
452 unsigned int power_of_two;
453
454 dynobj = elf_hash_table (info)->dynobj;
455
456 /* Make sure we know what is going on here. */
457 BFD_ASSERT (dynobj != NULL
458 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
459 || h->weakdef != NULL
460 || ((h->elf_link_hash_flags
461 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
462 && (h->elf_link_hash_flags
463 & ELF_LINK_HASH_REF_REGULAR) != 0
464 && (h->elf_link_hash_flags
465 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
466
467 /* If this is a function, put it in the procedure linkage table. We
468 will fill in the contents of the procedure linkage table later
469 (although we could actually do it here). */
470 if (h->type == STT_FUNC
471 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
472 {
473 if (! elf_hash_table (info)->dynamic_sections_created)
474 {
475 /* This case can occur if we saw a WPLT30 reloc in an input
476 file, but none of the input files were dynamic objects.
477 In such a case, we don't actually need to build a
478 procedure linkage table, and we can just do a WDISP30
479 reloc instead. */
480 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
481 return true;
482 }
483
484 s = bfd_get_section_by_name (dynobj, ".plt");
485 BFD_ASSERT (s != NULL);
486
487 /* The first four entries in .plt are reserved. */
488 if (s->_raw_size == 0)
489 s->_raw_size = 4 * PLT_ENTRY_SIZE;
490
491 /* The procedure linkage table has a maximum size. */
492 if (s->_raw_size >= 0x400000)
493 {
494 bfd_set_error (bfd_error_bad_value);
495 return false;
496 }
497
498 /* If this symbol is not defined in a regular file, and we are
499 not generating a shared library, then set the symbol to this
500 location in the .plt. This is required to make function
501 pointers compare as equal between the normal executable and
502 the shared library. */
503 if (! info->shared
504 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
505 {
506 h->root.u.def.section = s;
507 h->root.u.def.value = s->_raw_size;
508 }
509
510 h->plt_offset = s->_raw_size;
511
512 /* Make room for this entry. */
513 s->_raw_size += PLT_ENTRY_SIZE;
514
515 /* We also need to make an entry in the .rela.plt section. */
516
517 s = bfd_get_section_by_name (dynobj, ".rela.plt");
518 BFD_ASSERT (s != NULL);
519 s->_raw_size += sizeof (Elf32_External_Rela);
520
521 return true;
522 }
523
524 /* If this is a weak symbol, and there is a real definition, the
525 processor independent code will have arranged for us to see the
526 real definition first, and we can just use the same value. */
527 if (h->weakdef != NULL)
528 {
529 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
530 || h->weakdef->root.type == bfd_link_hash_defweak);
531 h->root.u.def.section = h->weakdef->root.u.def.section;
532 h->root.u.def.value = h->weakdef->root.u.def.value;
533 return true;
534 }
535
536 /* This is a reference to a symbol defined by a dynamic object which
537 is not a function. */
538
539 /* If we are creating a shared library, we must presume that the
540 only references to the symbol are via the global offset table.
541 For such cases we need not do anything here; the relocations will
542 be handled correctly by relocate_section. */
543 if (info->shared)
544 return true;
545
546 /* We must allocate the symbol in our .dynbss section, which will
547 become part of the .bss section of the executable. There will be
548 an entry for this symbol in the .dynsym section. The dynamic
549 object will contain position independent code, so all references
550 from the dynamic object to this symbol will go through the global
551 offset table. The dynamic linker will use the .dynsym entry to
552 determine the address it must put in the global offset table, so
553 both the dynamic object and the regular object will refer to the
554 same memory location for the variable. */
555
556 s = bfd_get_section_by_name (dynobj, ".dynbss");
557 BFD_ASSERT (s != NULL);
558
559 /* If the symbol is currently defined in the .bss section of the
560 dynamic object, then it is OK to simply initialize it to zero.
561 If the symbol is in some other section, we must generate a
562 R_SPARC_COPY reloc to tell the dynamic linker to copy the initial
563 value out of the dynamic object and into the runtime process
564 image. We need to remember the offset into the .rel.bss section
565 we are going to use. */
566 if ((h->root.u.def.section->flags & SEC_LOAD) != 0)
567 {
568 asection *srel;
569
570 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
571 BFD_ASSERT (srel != NULL);
572 srel->_raw_size += sizeof (Elf32_External_Rela);
573 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
574 }
575
576 /* We need to figure out the alignment required for this symbol. I
577 have no idea how ELF linkers handle this. */
578 power_of_two = bfd_log2 (h->size);
579 if (power_of_two > 3)
580 power_of_two = 3;
581
582 /* Apply the required alignment. */
583 s->_raw_size = BFD_ALIGN (s->_raw_size,
584 (bfd_size_type) (1 << power_of_two));
585 if (power_of_two > bfd_get_section_alignment (dynobj, s))
586 {
587 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
588 return false;
589 }
590
591 /* Define the symbol as being at this point in the section. */
592 h->root.u.def.section = s;
593 h->root.u.def.value = s->_raw_size;
594
595 /* Increment the section size to make room for the symbol. */
596 s->_raw_size += h->size;
597
598 return true;
599 }
600
601 /* Set the sizes of the dynamic sections. */
602
603 static boolean
604 elf32_sparc_size_dynamic_sections (output_bfd, info)
605 bfd *output_bfd;
606 struct bfd_link_info *info;
607 {
608 bfd *dynobj;
609 asection *s;
610 boolean reltext;
611 boolean relplt;
612
613 dynobj = elf_hash_table (info)->dynobj;
614 BFD_ASSERT (dynobj != NULL);
615
616 if (elf_hash_table (info)->dynamic_sections_created)
617 {
618 /* Set the contents of the .interp section to the interpreter. */
619 if (! info->shared)
620 {
621 s = bfd_get_section_by_name (dynobj, ".interp");
622 BFD_ASSERT (s != NULL);
623 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
624 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
625 }
626
627 /* Make space for the trailing nop in .plt. */
628 s = bfd_get_section_by_name (dynobj, ".plt");
629 BFD_ASSERT (s != NULL);
630 if (s->_raw_size > 0)
631 s->_raw_size += 4;
632 }
633 else
634 {
635 /* We may have created entries in the .rela.got section.
636 However, if we are not creating the dynamic sections, we will
637 not actually use these entries. Reset the size of .rela.got,
638 which will cause it to get stripped from the output file
639 below. */
640 s = bfd_get_section_by_name (dynobj, ".rela.got");
641 if (s != NULL)
642 s->_raw_size = 0;
643 }
644
645 /* The check_relocs and adjust_dynamic_symbol entry points have
646 determined the sizes of the various dynamic sections. Allocate
647 memory for them. */
648 reltext = false;
649 relplt = false;
650 for (s = dynobj->sections; s != NULL; s = s->next)
651 {
652 const char *name;
653 boolean strip;
654
655 if ((s->flags & SEC_IN_MEMORY) == 0)
656 continue;
657
658 /* It's OK to base decisions on the section name, because none
659 of the dynobj section names depend upon the input files. */
660 name = bfd_get_section_name (dynobj, s);
661
662 strip = false;
663
664 if (strncmp (name, ".rela", 5) == 0)
665 {
666 if (s->_raw_size == 0)
667 {
668 /* If we don't need this section, strip it from the
669 output file. This is to handle .rela.bss and
670 .rel.plt. We must create it in
671 create_dynamic_sections, because it must be created
672 before the linker maps input sections to output
673 sections. The linker does that before
674 adjust_dynamic_symbol is called, and it is that
675 function which decides whether anything needs to go
676 into these sections. */
677 strip = true;
678 }
679 else
680 {
681 asection *target;
682
683 /* If this relocation section applies to a read only
684 section, then we probably need a DT_TEXTREL entry. */
685 target = bfd_get_section_by_name (output_bfd, name + 5);
686 if (target != NULL
687 && (target->flags & SEC_READONLY) != 0)
688 reltext = true;
689
690 if (strcmp (name, ".rela.plt") == 0)
691 relplt = true;
692
693 /* We use the reloc_count field as a counter if we need
694 to copy relocs into the output file. */
695 s->reloc_count = 0;
696 }
697 }
698 else if (strcmp (name, ".plt") != 0
699 && strcmp (name, ".got") != 0)
700 {
701 /* It's not one of our sections, so don't allocate space. */
702 continue;
703 }
704
705 if (strip)
706 {
707 asection **spp;
708
709 for (spp = &s->output_section->owner->sections;
710 *spp != s->output_section;
711 spp = &(*spp)->next)
712 ;
713 *spp = s->output_section->next;
714 --s->output_section->owner->section_count;
715
716 continue;
717 }
718
719 /* Allocate memory for the section contents. */
720 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
721 if (s->contents == NULL && s->_raw_size != 0)
722 {
723 bfd_set_error (bfd_error_no_memory);
724 return false;
725 }
726 }
727
728 if (elf_hash_table (info)->dynamic_sections_created)
729 {
730 /* Add some entries to the .dynamic section. We fill in the
731 values later, in elf32_sparc_finish_dynamic_sections, but we
732 must add the entries now so that we get the correct size for
733 the .dynamic section. The DT_DEBUG entry is filled in by the
734 dynamic linker and used by the debugger. */
735 if (! info->shared)
736 {
737 if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
738 return false;
739 }
740
741 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0))
742 return false;
743
744 if (relplt)
745 {
746 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
747 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
748 || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
749 return false;
750 }
751
752 if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
753 || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
754 || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
755 sizeof (Elf32_External_Rela)))
756 return false;
757
758 if (reltext)
759 {
760 if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
761 return false;
762 }
763 }
764
765 /* If we are generating a shared library, we generate a section
766 symbol for each output section. These are local symbols, which
767 means that they must come first in the dynamic symbol table.
768 That means we must increment the dynamic symbol index of every
769 other dynamic symbol. */
770 if (info->shared)
771 {
772 int c, i;
773
774 c = bfd_count_sections (output_bfd);
775 elf_link_hash_traverse (elf_hash_table (info),
776 elf32_sparc_adjust_dynindx,
777 (PTR) &c);
778 elf_hash_table (info)->dynsymcount += c;
779
780 for (i = 1, s = output_bfd->sections; s != NULL; s = s->next, i++)
781 {
782 elf_section_data (s)->dynindx = i;
783 /* These symbols will have no names, so we don't need to
784 fiddle with dynstr_index. */
785 }
786 }
787
788 return true;
789 }
790
791 /* Increment the index of a dynamic symbol by a given amount. Called
792 via elf_link_hash_traverse. */
793
794 static boolean
795 elf32_sparc_adjust_dynindx (h, cparg)
796 struct elf_link_hash_entry *h;
797 PTR cparg;
798 {
799 int *cp = (int *) cparg;
800
801 if (h->dynindx != -1)
802 h->dynindx += *cp;
803 return true;
804 }
805
806 /* Relocate a SPARC ELF section. */
807
808 static boolean
809 elf32_sparc_relocate_section (output_bfd, info, input_bfd, input_section,
810 contents, relocs, local_syms, local_sections)
811 bfd *output_bfd;
812 struct bfd_link_info *info;
813 bfd *input_bfd;
814 asection *input_section;
815 bfd_byte *contents;
816 Elf_Internal_Rela *relocs;
817 Elf_Internal_Sym *local_syms;
818 asection **local_sections;
819 {
820 bfd *dynobj;
821 Elf_Internal_Shdr *symtab_hdr;
822 struct elf_link_hash_entry **sym_hashes;
823 bfd_vma *local_got_offsets;
824 asection *sgot;
825 asection *splt;
826 asection *sreloc;
827 Elf_Internal_Rela *rel;
828 Elf_Internal_Rela *relend;
829
830 dynobj = elf_hash_table (info)->dynobj;
831 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
832 sym_hashes = elf_sym_hashes (input_bfd);
833 local_got_offsets = elf_local_got_offsets (input_bfd);
834
835 sgot = NULL;
836 splt = NULL;
837 sreloc = NULL;
838
839 rel = relocs;
840 relend = relocs + input_section->reloc_count;
841 for (; rel < relend; rel++)
842 {
843 int r_type;
844 reloc_howto_type *howto;
845 unsigned long r_symndx;
846 struct elf_link_hash_entry *h;
847 Elf_Internal_Sym *sym;
848 asection *sec;
849 bfd_vma relocation;
850 bfd_reloc_status_type r;
851
852 r_type = ELF32_R_TYPE (rel->r_info);
853 if (r_type < 0 || r_type >= (int) R_SPARC_max)
854 {
855 bfd_set_error (bfd_error_bad_value);
856 return false;
857 }
858 howto = elf_sparc_howto_table + r_type;
859
860 r_symndx = ELF32_R_SYM (rel->r_info);
861
862 if (info->relocateable)
863 {
864 /* This is a relocateable link. We don't have to change
865 anything, unless the reloc is against a section symbol,
866 in which case we have to adjust according to where the
867 section symbol winds up in the output section. */
868 if (r_symndx < symtab_hdr->sh_info)
869 {
870 sym = local_syms + r_symndx;
871 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
872 {
873 sec = local_sections[r_symndx];
874 rel->r_addend += sec->output_offset + sym->st_value;
875 }
876 }
877
878 continue;
879 }
880
881 /* This is a final link. */
882 h = NULL;
883 sym = NULL;
884 sec = NULL;
885 if (r_symndx < symtab_hdr->sh_info)
886 {
887 sym = local_syms + r_symndx;
888 sec = local_sections[r_symndx];
889 relocation = (sec->output_section->vma
890 + sec->output_offset
891 + sym->st_value);
892 }
893 else
894 {
895 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
896 if (h->root.type == bfd_link_hash_defined
897 || h->root.type == bfd_link_hash_defweak)
898 {
899 sec = h->root.u.def.section;
900 if ((r_type == R_SPARC_WPLT30
901 && h->plt_offset != (bfd_vma) -1)
902 || ((r_type == R_SPARC_GOT10
903 || r_type == R_SPARC_GOT13
904 || r_type == R_SPARC_GOT22)
905 && elf_hash_table (info)->dynamic_sections_created
906 && (! info->shared
907 || ! info->symbolic
908 || (h->elf_link_hash_flags
909 & ELF_LINK_HASH_DEF_REGULAR) == 0))
910 || (info->shared
911 && (input_section->flags & SEC_ALLOC) != 0
912 && (r_type == R_SPARC_8
913 || r_type == R_SPARC_16
914 || r_type == R_SPARC_32
915 || r_type == R_SPARC_DISP8
916 || r_type == R_SPARC_DISP16
917 || r_type == R_SPARC_DISP32
918 || r_type == R_SPARC_WDISP30
919 || r_type == R_SPARC_WDISP22
920 || r_type == R_SPARC_HI22
921 || r_type == R_SPARC_22
922 || r_type == R_SPARC_13
923 || r_type == R_SPARC_LO10
924 || r_type == R_SPARC_UA32
925 || ((r_type == R_SPARC_PC10
926 || r_type == R_SPARC_PC22)
927 && strcmp (h->root.root.string,
928 "_GLOBAL_OFFSET_TABLE_") != 0))))
929 {
930 /* In these cases, we don't need the relocation
931 value. We check specially because in some
932 obscure cases sec->output_section will be NULL. */
933 relocation = 0;
934 }
935 else
936 relocation = (h->root.u.def.value
937 + sec->output_section->vma
938 + sec->output_offset);
939 }
940 else if (h->root.type == bfd_link_hash_undefweak)
941 relocation = 0;
942 else if (info->shared && !info->symbolic)
943 relocation = 0;
944 else
945 {
946 if (! ((*info->callbacks->undefined_symbol)
947 (info, h->root.root.string, input_bfd,
948 input_section, rel->r_offset)))
949 return false;
950 relocation = 0;
951 }
952 }
953
954 switch (r_type)
955 {
956 case R_SPARC_GOT10:
957 case R_SPARC_GOT13:
958 case R_SPARC_GOT22:
959 /* Relocation is to the entry for this symbol in the global
960 offset table. */
961 if (sgot == NULL)
962 {
963 sgot = bfd_get_section_by_name (dynobj, ".got");
964 BFD_ASSERT (sgot != NULL);
965 }
966
967 if (h != NULL)
968 {
969 bfd_vma off;
970
971 off = h->got_offset;
972 BFD_ASSERT (off != (bfd_vma) -1);
973
974 if (! elf_hash_table (info)->dynamic_sections_created
975 || (info->shared
976 && info->symbolic
977 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
978 {
979 /* This is actually a static link, or it is a
980 -Bsymbolic link and the symbol is defined
981 locally. We must initialize this entry in the
982 global offset table. Since the offset must
983 always be a multiple of 4, we use the least
984 significant bit to record whether we have
985 initialized it already.
986
987 When doing a dynamic link, we create a .rela.got
988 relocation entry to initialize the value. This
989 is done in the finish_dynamic_symbol routine. */
990 if ((off & 1) != 0)
991 off &= ~1;
992 else
993 {
994 bfd_put_32 (output_bfd, relocation,
995 sgot->contents + off);
996 h->got_offset |= 1;
997 }
998 }
999
1000 relocation = sgot->output_offset + off;
1001 }
1002 else
1003 {
1004 bfd_vma off;
1005
1006 BFD_ASSERT (local_got_offsets != NULL
1007 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1008
1009 off = local_got_offsets[r_symndx];
1010
1011 /* The offset must always be a multiple of 4. We use
1012 the least significant bit to record whether we have
1013 already processed this entry. */
1014 if ((off & 1) != 0)
1015 off &= ~1;
1016 else
1017 {
1018 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1019
1020 if (info->shared)
1021 {
1022 asection *srelgot;
1023 Elf_Internal_Rela outrel;
1024
1025 /* We need to generate a R_SPARC_RELATIVE reloc
1026 for the dynamic linker. */
1027 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1028 BFD_ASSERT (srelgot != NULL);
1029
1030 outrel.r_offset = (sgot->output_section->vma
1031 + sgot->output_offset
1032 + off);
1033 outrel.r_info = ELF32_R_INFO (0, R_SPARC_RELATIVE);
1034 outrel.r_addend = 0;
1035 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1036 (((Elf32_External_Rela *)
1037 srelgot->contents)
1038 + srelgot->reloc_count));
1039 ++srelgot->reloc_count;
1040 }
1041
1042 local_got_offsets[r_symndx] |= 1;
1043 }
1044
1045 relocation = sgot->output_offset + off;
1046 }
1047
1048 break;
1049
1050 case R_SPARC_WPLT30:
1051 /* Relocation is to the entry for this symbol in the
1052 procedure linkage table. */
1053 BFD_ASSERT (h != NULL);
1054
1055 if (h->plt_offset == (bfd_vma) -1)
1056 {
1057 /* We didn't make a PLT entry for this symbol. This
1058 happens when statically linking PIC code, or when
1059 using -Bsymbolic. */
1060 break;
1061 }
1062
1063 if (splt == NULL)
1064 {
1065 splt = bfd_get_section_by_name (dynobj, ".plt");
1066 BFD_ASSERT (splt != NULL);
1067 }
1068
1069 relocation = (splt->output_section->vma
1070 + splt->output_offset
1071 + h->plt_offset);
1072 break;
1073
1074 case R_SPARC_PC10:
1075 case R_SPARC_PC22:
1076 if (h != NULL
1077 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1078 break;
1079 /* Fall through. */
1080 case R_SPARC_DISP8:
1081 case R_SPARC_DISP16:
1082 case R_SPARC_DISP32:
1083 case R_SPARC_WDISP30:
1084 case R_SPARC_WDISP22:
1085 if (h == NULL)
1086 break;
1087 /* Fall through. */
1088 case R_SPARC_8:
1089 case R_SPARC_16:
1090 case R_SPARC_32:
1091 case R_SPARC_HI22:
1092 case R_SPARC_22:
1093 case R_SPARC_13:
1094 case R_SPARC_LO10:
1095 case R_SPARC_UA32:
1096 if (info->shared
1097 && (input_section->flags & SEC_ALLOC) != 0)
1098 {
1099 Elf_Internal_Rela outrel;
1100
1101 /* When generating a shared object, these relocations
1102 are copied into the output file to be resolved at run
1103 time. */
1104
1105 if (sreloc == NULL)
1106 {
1107 const char *name;
1108
1109 name = (bfd_elf_string_from_elf_section
1110 (input_bfd,
1111 elf_elfheader (input_bfd)->e_shstrndx,
1112 elf_section_data (input_section)->rel_hdr.sh_name));
1113 if (name == NULL)
1114 return false;
1115
1116 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1117 && strcmp (bfd_get_section_name (input_bfd,
1118 input_section),
1119 name + 5) == 0);
1120
1121 sreloc = bfd_get_section_by_name (dynobj, name);
1122 BFD_ASSERT (sreloc != NULL);
1123 }
1124
1125 outrel.r_offset = (rel->r_offset
1126 + input_section->output_section->vma
1127 + input_section->output_offset);
1128 if (h != NULL)
1129 {
1130 BFD_ASSERT (h->dynindx != -1);
1131 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1132 outrel.r_addend = rel->r_addend;
1133 }
1134 else
1135 {
1136 if (r_type == R_SPARC_32)
1137 {
1138 outrel.r_info = ELF32_R_INFO (0, R_SPARC_RELATIVE);
1139 outrel.r_addend = relocation + rel->r_addend;
1140 }
1141 else
1142 {
1143 long indx;
1144
1145 sym = local_syms + r_symndx;
1146
1147 BFD_ASSERT (ELF_ST_TYPE (sym->st_info) == STT_SECTION);
1148
1149 sec = local_sections[r_symndx];
1150 if (sec != NULL && bfd_is_abs_section (sec))
1151 indx = 0;
1152 else if (sec == NULL || sec->owner == NULL)
1153 {
1154 bfd_set_error (bfd_error_bad_value);
1155 return false;
1156 }
1157 else
1158 {
1159 asection *osec;
1160
1161 osec = sec->output_section;
1162 indx = elf_section_data (osec)->dynindx;
1163 if (indx == 0)
1164 abort ();
1165 }
1166
1167 outrel.r_info = ELF32_R_INFO (indx, r_type);
1168 outrel.r_addend = relocation + rel->r_addend;
1169 }
1170 }
1171
1172 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1173 (((Elf32_External_Rela *)
1174 sreloc->contents)
1175 + sreloc->reloc_count));
1176 ++sreloc->reloc_count;
1177
1178 /* This reloc will be computed at runtime, so there's no
1179 need to do anything now. */
1180 continue;
1181 }
1182
1183 default:
1184 break;
1185 }
1186
1187 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1188 contents, rel->r_offset,
1189 relocation, rel->r_addend);
1190
1191 if (r != bfd_reloc_ok)
1192 {
1193 switch (r)
1194 {
1195 default:
1196 case bfd_reloc_outofrange:
1197 abort ();
1198 case bfd_reloc_overflow:
1199 {
1200 const char *name;
1201
1202 if (h != NULL)
1203 name = h->root.root.string;
1204 else
1205 {
1206 name = bfd_elf_string_from_elf_section (input_bfd,
1207 symtab_hdr->sh_link,
1208 sym->st_name);
1209 if (name == NULL)
1210 return false;
1211 if (*name == '\0')
1212 name = bfd_section_name (input_bfd, sec);
1213 }
1214 if (! ((*info->callbacks->reloc_overflow)
1215 (info, name, howto->name, (bfd_vma) 0,
1216 input_bfd, input_section, rel->r_offset)))
1217 return false;
1218 }
1219 break;
1220 }
1221 }
1222 }
1223
1224 return true;
1225 }
1226
1227 /* Finish up dynamic symbol handling. We set the contents of various
1228 dynamic sections here. */
1229
1230 static boolean
1231 elf32_sparc_finish_dynamic_symbol (output_bfd, info, h, sym)
1232 bfd *output_bfd;
1233 struct bfd_link_info *info;
1234 struct elf_link_hash_entry *h;
1235 Elf_Internal_Sym *sym;
1236 {
1237 bfd *dynobj;
1238
1239 dynobj = elf_hash_table (info)->dynobj;
1240
1241 if (h->plt_offset != (bfd_vma) -1)
1242 {
1243 asection *splt;
1244 asection *srela;
1245 Elf_Internal_Rela rela;
1246
1247 /* This symbol has an entry in the procedure linkage table. Set
1248 it up. */
1249
1250 BFD_ASSERT (h->dynindx != -1);
1251
1252 splt = bfd_get_section_by_name (dynobj, ".plt");
1253 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1254 BFD_ASSERT (splt != NULL && srela != NULL);
1255
1256 /* Fill in the entry in the procedure linkage table. */
1257 bfd_put_32 (output_bfd,
1258 PLT_ENTRY_WORD0 + h->plt_offset,
1259 splt->contents + h->plt_offset);
1260 bfd_put_32 (output_bfd,
1261 (PLT_ENTRY_WORD1
1262 + (((- (h->plt_offset + 4)) >> 2) & 0x3fffff)),
1263 splt->contents + h->plt_offset + 4);
1264 bfd_put_32 (output_bfd, PLT_ENTRY_WORD2,
1265 splt->contents + h->plt_offset + 8);
1266
1267 /* Fill in the entry in the .rela.plt section. */
1268 rela.r_offset = (splt->output_section->vma
1269 + splt->output_offset
1270 + h->plt_offset);
1271 rela.r_info = ELF32_R_INFO (h->dynindx, R_SPARC_JMP_SLOT);
1272 rela.r_addend = 0;
1273 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1274 ((Elf32_External_Rela *) srela->contents
1275 + h->plt_offset / PLT_ENTRY_SIZE - 4));
1276
1277 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1278 {
1279 /* Mark the symbol as undefined, rather than as defined in
1280 the .plt section. Leave the value alone. */
1281 sym->st_shndx = SHN_UNDEF;
1282 }
1283 }
1284
1285 if (h->got_offset != (bfd_vma) -1)
1286 {
1287 asection *sgot;
1288 asection *srela;
1289 Elf_Internal_Rela rela;
1290
1291 /* This symbol has an entry in the global offset table. Set it
1292 up. */
1293
1294 BFD_ASSERT (h->dynindx != -1);
1295
1296 sgot = bfd_get_section_by_name (dynobj, ".got");
1297 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1298 BFD_ASSERT (sgot != NULL && srela != NULL);
1299
1300 rela.r_offset = (sgot->output_section->vma
1301 + sgot->output_offset
1302 + (h->got_offset &~ 1));
1303
1304 /* If this is a -Bsymbolic link, and the symbol is defined
1305 locally, we just want to emit a RELATIVE reloc. The entry in
1306 the global offset table will already have been initialized in
1307 the relocate_section function. */
1308 if (info->shared
1309 && info->symbolic
1310 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1311 rela.r_info = ELF32_R_INFO (0, R_SPARC_RELATIVE);
1312 else
1313 {
1314 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got_offset);
1315 rela.r_info = ELF32_R_INFO (h->dynindx, R_SPARC_GLOB_DAT);
1316 }
1317
1318 rela.r_addend = 0;
1319 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1320 ((Elf32_External_Rela *) srela->contents
1321 + srela->reloc_count));
1322 ++srela->reloc_count;
1323 }
1324
1325 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1326 {
1327 asection *s;
1328 Elf_Internal_Rela rela;
1329
1330 /* This symbols needs a copy reloc. Set it up. */
1331
1332 BFD_ASSERT (h->dynindx != -1);
1333
1334 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1335 ".rela.bss");
1336 BFD_ASSERT (s != NULL);
1337
1338 rela.r_offset = (h->root.u.def.value
1339 + h->root.u.def.section->output_section->vma
1340 + h->root.u.def.section->output_offset);
1341 rela.r_info = ELF32_R_INFO (h->dynindx, R_SPARC_COPY);
1342 rela.r_addend = 0;
1343 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1344 ((Elf32_External_Rela *) s->contents
1345 + s->reloc_count));
1346 ++s->reloc_count;
1347 }
1348
1349 /* Mark some specially defined symbols as absolute. */
1350 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1351 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
1352 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
1353 sym->st_shndx = SHN_ABS;
1354
1355 return true;
1356 }
1357
1358 /* Finish up the dynamic sections. */
1359
1360 static boolean
1361 elf32_sparc_finish_dynamic_sections (output_bfd, info)
1362 bfd *output_bfd;
1363 struct bfd_link_info *info;
1364 {
1365 bfd *dynobj;
1366 asection *sdyn;
1367 asection *sgot;
1368
1369 dynobj = elf_hash_table (info)->dynobj;
1370
1371 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1372
1373 if (elf_hash_table (info)->dynamic_sections_created)
1374 {
1375 asection *splt;
1376 Elf32_External_Dyn *dyncon, *dynconend;
1377
1378 splt = bfd_get_section_by_name (dynobj, ".plt");
1379 BFD_ASSERT (splt != NULL && sdyn != NULL);
1380
1381 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1382 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1383 for (; dyncon < dynconend; dyncon++)
1384 {
1385 Elf_Internal_Dyn dyn;
1386 const char *name;
1387 boolean size;
1388
1389 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1390
1391 switch (dyn.d_tag)
1392 {
1393 case DT_PLTGOT: name = ".plt"; size = false; break;
1394 case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
1395 case DT_JMPREL: name = ".rela.plt"; size = false; break;
1396 default: name = NULL; size = false; break;
1397 }
1398
1399 if (name != NULL)
1400 {
1401 asection *s;
1402
1403 s = bfd_get_section_by_name (output_bfd, name);
1404 if (s == NULL)
1405 dyn.d_un.d_val = 0;
1406 else
1407 {
1408 if (! size)
1409 dyn.d_un.d_ptr = s->vma;
1410 else
1411 {
1412 if (s->_cooked_size != 0)
1413 dyn.d_un.d_val = s->_cooked_size;
1414 else
1415 dyn.d_un.d_val = s->_raw_size;
1416 }
1417 }
1418 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1419 }
1420 }
1421
1422 /* Clear the first four entries in the procedure linkage table,
1423 and put a nop in the last four bytes. */
1424 if (splt->_raw_size > 0)
1425 {
1426 memset (splt->contents, 0, 4 * PLT_ENTRY_SIZE);
1427 bfd_put_32 (output_bfd, SPARC_NOP,
1428 splt->contents + splt->_raw_size - 4);
1429 }
1430
1431 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
1432 PLT_ENTRY_SIZE;
1433 }
1434
1435 /* Set the first entry in the global offset table to the address of
1436 the dynamic section. */
1437 sgot = bfd_get_section_by_name (dynobj, ".got");
1438 BFD_ASSERT (sgot != NULL);
1439 if (sgot->_raw_size > 0)
1440 {
1441 if (sdyn == NULL)
1442 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1443 else
1444 bfd_put_32 (output_bfd,
1445 sdyn->output_section->vma + sdyn->output_offset,
1446 sgot->contents);
1447 }
1448
1449 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1450
1451 if (info->shared)
1452 {
1453 asection *sdynsym;
1454 asection *s;
1455 Elf_Internal_Sym sym;
1456
1457 /* Set up the section symbols for the output sections. */
1458
1459 sdynsym = bfd_get_section_by_name (dynobj, ".dynsym");
1460 BFD_ASSERT (sdynsym != NULL);
1461
1462 sym.st_size = 0;
1463 sym.st_name = 0;
1464 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
1465 sym.st_other = 0;
1466
1467 for (s = output_bfd->sections; s != NULL; s = s->next)
1468 {
1469 int indx;
1470
1471 sym.st_value = s->vma;
1472
1473 indx = elf_section_data (s)->this_idx;
1474 BFD_ASSERT (indx > 0);
1475 sym.st_shndx = indx;
1476
1477 bfd_elf32_swap_symbol_out (output_bfd, &sym,
1478 (PTR) (((Elf32_External_Sym *)
1479 sdynsym->contents)
1480 + elf_section_data (s)->dynindx));
1481 }
1482
1483 /* Set the sh_info field of the output .dynsym section to the
1484 index of the first global symbol. */
1485 elf_section_data (sdynsym->output_section)->this_hdr.sh_info =
1486 bfd_count_sections (output_bfd) + 1;
1487 }
1488
1489 return true;
1490 }
1491
1492 #define TARGET_BIG_SYM bfd_elf32_sparc_vec
1493 #define TARGET_BIG_NAME "elf32-sparc"
1494 #define ELF_ARCH bfd_arch_sparc
1495 #define ELF_MACHINE_CODE EM_SPARC
1496 #define ELF_MAXPAGESIZE 0x10000
1497 #define elf_backend_create_dynamic_sections \
1498 _bfd_elf_create_dynamic_sections
1499 #define elf_backend_check_relocs elf32_sparc_check_relocs
1500 #define elf_backend_adjust_dynamic_symbol \
1501 elf32_sparc_adjust_dynamic_symbol
1502 #define elf_backend_size_dynamic_sections \
1503 elf32_sparc_size_dynamic_sections
1504 #define elf_backend_relocate_section elf32_sparc_relocate_section
1505 #define elf_backend_finish_dynamic_symbol \
1506 elf32_sparc_finish_dynamic_symbol
1507 #define elf_backend_finish_dynamic_sections \
1508 elf32_sparc_finish_dynamic_sections
1509 #define elf_backend_want_got_plt 0
1510 #define elf_backend_plt_readonly 0
1511 #define elf_backend_want_plt_sym 1
1512
1513 #include "elf32-target.h"
GDB Binutils - Deliverables
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