Commit | Line | Data |
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252b5132 | 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
5f771d47 | 2 | Copyright 1993, 94-98, 1999 Free Software Foundation, Inc. |
252b5132 RH |
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 *elf_i386_reloc_type_lookup | |
27 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
28 | static void elf_i386_info_to_howto | |
29 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
30 | static void elf_i386_info_to_howto_rel | |
31 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); | |
32 | static boolean elf_i386_is_local_label_name PARAMS ((bfd *, const char *)); | |
33 | static struct bfd_hash_entry *elf_i386_link_hash_newfunc | |
34 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
35 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create | |
36 | PARAMS ((bfd *)); | |
37 | static boolean elf_i386_check_relocs | |
38 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
39 | const Elf_Internal_Rela *)); | |
40 | static boolean elf_i386_adjust_dynamic_symbol | |
41 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
42 | static boolean elf_i386_size_dynamic_sections | |
43 | PARAMS ((bfd *, struct bfd_link_info *)); | |
44 | static boolean elf_i386_relocate_section | |
45 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
46 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
47 | static boolean elf_i386_finish_dynamic_symbol | |
48 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
49 | Elf_Internal_Sym *)); | |
50 | static boolean elf_i386_finish_dynamic_sections | |
51 | PARAMS ((bfd *, struct bfd_link_info *)); | |
52 | ||
53 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ | |
54 | ||
55 | #include "elf/i386.h" | |
56 | ||
57 | static reloc_howto_type elf_howto_table[]= | |
58 | { | |
59 | HOWTO(R_386_NONE, 0,0, 0,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_NONE", true,0x00000000,0x00000000,false), | |
60 | HOWTO(R_386_32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_32", true,0xffffffff,0xffffffff,false), | |
61 | HOWTO(R_386_PC32, 0,2,32,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC32", true,0xffffffff,0xffffffff,true), | |
62 | HOWTO(R_386_GOT32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOT32", true,0xffffffff,0xffffffff,false), | |
63 | HOWTO(R_386_PLT32, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PLT32", true,0xffffffff,0xffffffff,true), | |
64 | HOWTO(R_386_COPY, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_COPY", true,0xffffffff,0xffffffff,false), | |
65 | HOWTO(R_386_GLOB_DAT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GLOB_DAT", true,0xffffffff,0xffffffff,false), | |
66 | HOWTO(R_386_JUMP_SLOT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_JUMP_SLOT",true,0xffffffff,0xffffffff,false), | |
67 | HOWTO(R_386_RELATIVE, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_RELATIVE", true,0xffffffff,0xffffffff,false), | |
68 | HOWTO(R_386_GOTOFF, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTOFF", true,0xffffffff,0xffffffff,false), | |
69 | HOWTO(R_386_GOTPC, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTPC", true,0xffffffff,0xffffffff,true), | |
5f771d47 ILT |
70 | EMPTY_HOWTO (11), |
71 | EMPTY_HOWTO (12), | |
72 | EMPTY_HOWTO (13), | |
73 | EMPTY_HOWTO (14), | |
74 | EMPTY_HOWTO (15), | |
75 | EMPTY_HOWTO (16), | |
76 | EMPTY_HOWTO (17), | |
77 | EMPTY_HOWTO (18), | |
78 | EMPTY_HOWTO (19), | |
252b5132 RH |
79 | /* The remaining relocs are a GNU extension. */ |
80 | HOWTO(R_386_16, 0,1,16,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_16", true,0xffff,0xffff,false), | |
81 | HOWTO(R_386_PC16, 0,1,16,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC16", true,0xffff,0xffff,true), | |
82 | HOWTO(R_386_8, 0,0,8,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_8", true,0xff,0xff,false), | |
3e269912 | 83 | HOWTO(R_386_PC8, 0,0,8,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_386_PC8", true,0xff,0xff,true), |
252b5132 RH |
84 | }; |
85 | ||
86 | /* GNU extension to record C++ vtable hierarchy. */ | |
87 | static reloc_howto_type elf32_i386_vtinherit_howto = | |
88 | HOWTO (R_386_GNU_VTINHERIT, /* type */ | |
89 | 0, /* rightshift */ | |
90 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
91 | 0, /* bitsize */ | |
92 | false, /* pc_relative */ | |
93 | 0, /* bitpos */ | |
94 | complain_overflow_dont, /* complain_on_overflow */ | |
95 | NULL, /* special_function */ | |
96 | "R_386_GNU_VTINHERIT", /* name */ | |
97 | false, /* partial_inplace */ | |
98 | 0, /* src_mask */ | |
99 | 0, /* dst_mask */ | |
100 | false); | |
101 | ||
102 | /* GNU extension to record C++ vtable member usage. */ | |
103 | static reloc_howto_type elf32_i386_vtentry_howto = | |
104 | HOWTO (R_386_GNU_VTENTRY, /* type */ | |
105 | 0, /* rightshift */ | |
106 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
107 | 0, /* bitsize */ | |
108 | false, /* pc_relative */ | |
109 | 0, /* bitpos */ | |
110 | complain_overflow_dont, /* complain_on_overflow */ | |
111 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
112 | "R_386_GNU_VTENTRY", /* name */ | |
113 | false, /* partial_inplace */ | |
114 | 0, /* src_mask */ | |
115 | 0, /* dst_mask */ | |
116 | false); | |
117 | ||
118 | #ifdef DEBUG_GEN_RELOC | |
119 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) | |
120 | #else | |
121 | #define TRACE(str) | |
122 | #endif | |
123 | ||
124 | static reloc_howto_type * | |
125 | elf_i386_reloc_type_lookup (abfd, code) | |
7442e600 | 126 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
127 | bfd_reloc_code_real_type code; |
128 | { | |
129 | switch (code) | |
130 | { | |
131 | case BFD_RELOC_NONE: | |
132 | TRACE ("BFD_RELOC_NONE"); | |
133 | return &elf_howto_table[ (int)R_386_NONE ]; | |
134 | ||
135 | case BFD_RELOC_32: | |
136 | TRACE ("BFD_RELOC_32"); | |
137 | return &elf_howto_table[ (int)R_386_32 ]; | |
138 | ||
139 | case BFD_RELOC_CTOR: | |
140 | TRACE ("BFD_RELOC_CTOR"); | |
141 | return &elf_howto_table[ (int)R_386_32 ]; | |
142 | ||
143 | case BFD_RELOC_32_PCREL: | |
144 | TRACE ("BFD_RELOC_PC32"); | |
145 | return &elf_howto_table[ (int)R_386_PC32 ]; | |
146 | ||
147 | case BFD_RELOC_386_GOT32: | |
148 | TRACE ("BFD_RELOC_386_GOT32"); | |
149 | return &elf_howto_table[ (int)R_386_GOT32 ]; | |
150 | ||
151 | case BFD_RELOC_386_PLT32: | |
152 | TRACE ("BFD_RELOC_386_PLT32"); | |
153 | return &elf_howto_table[ (int)R_386_PLT32 ]; | |
154 | ||
155 | case BFD_RELOC_386_COPY: | |
156 | TRACE ("BFD_RELOC_386_COPY"); | |
157 | return &elf_howto_table[ (int)R_386_COPY ]; | |
158 | ||
159 | case BFD_RELOC_386_GLOB_DAT: | |
160 | TRACE ("BFD_RELOC_386_GLOB_DAT"); | |
161 | return &elf_howto_table[ (int)R_386_GLOB_DAT ]; | |
162 | ||
163 | case BFD_RELOC_386_JUMP_SLOT: | |
164 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); | |
165 | return &elf_howto_table[ (int)R_386_JUMP_SLOT ]; | |
166 | ||
167 | case BFD_RELOC_386_RELATIVE: | |
168 | TRACE ("BFD_RELOC_386_RELATIVE"); | |
169 | return &elf_howto_table[ (int)R_386_RELATIVE ]; | |
170 | ||
171 | case BFD_RELOC_386_GOTOFF: | |
172 | TRACE ("BFD_RELOC_386_GOTOFF"); | |
173 | return &elf_howto_table[ (int)R_386_GOTOFF ]; | |
174 | ||
175 | case BFD_RELOC_386_GOTPC: | |
176 | TRACE ("BFD_RELOC_386_GOTPC"); | |
177 | return &elf_howto_table[ (int)R_386_GOTPC ]; | |
178 | ||
179 | /* The remaining relocs are a GNU extension. */ | |
180 | case BFD_RELOC_16: | |
181 | TRACE ("BFD_RELOC_16"); | |
182 | return &elf_howto_table[(int) R_386_16]; | |
183 | ||
184 | case BFD_RELOC_16_PCREL: | |
185 | TRACE ("BFD_RELOC_16_PCREL"); | |
186 | return &elf_howto_table[(int) R_386_PC16]; | |
187 | ||
188 | case BFD_RELOC_8: | |
189 | TRACE ("BFD_RELOC_8"); | |
190 | return &elf_howto_table[(int) R_386_8]; | |
191 | ||
192 | case BFD_RELOC_8_PCREL: | |
193 | TRACE ("BFD_RELOC_8_PCREL"); | |
194 | return &elf_howto_table[(int) R_386_PC8]; | |
195 | ||
196 | case BFD_RELOC_VTABLE_INHERIT: | |
197 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); | |
198 | return &elf32_i386_vtinherit_howto; | |
199 | ||
200 | case BFD_RELOC_VTABLE_ENTRY: | |
201 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); | |
202 | return &elf32_i386_vtentry_howto; | |
203 | ||
204 | default: | |
205 | break; | |
206 | } | |
207 | ||
208 | TRACE ("Unknown"); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static void | |
213 | elf_i386_info_to_howto (abfd, cache_ptr, dst) | |
7442e600 ILT |
214 | bfd *abfd ATTRIBUTE_UNUSED; |
215 | arelent *cache_ptr ATTRIBUTE_UNUSED; | |
216 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; | |
252b5132 RH |
217 | { |
218 | abort (); | |
219 | } | |
220 | ||
221 | static void | |
222 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) | |
7442e600 | 223 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
224 | arelent *cache_ptr; |
225 | Elf32_Internal_Rel *dst; | |
226 | { | |
227 | enum elf_i386_reloc_type type; | |
228 | ||
229 | type = (enum elf_i386_reloc_type) ELF32_R_TYPE (dst->r_info); | |
230 | if (type == R_386_GNU_VTINHERIT) | |
231 | cache_ptr->howto = &elf32_i386_vtinherit_howto; | |
232 | else if (type == R_386_GNU_VTENTRY) | |
233 | cache_ptr->howto = &elf32_i386_vtentry_howto; | |
234 | else | |
235 | { | |
236 | BFD_ASSERT (type < R_386_max); | |
237 | BFD_ASSERT (type < FIRST_INVALID_RELOC || type > LAST_INVALID_RELOC); | |
238 | cache_ptr->howto = &elf_howto_table[(int) type]; | |
239 | } | |
240 | } | |
241 | ||
242 | /* Return whether a symbol name implies a local label. The UnixWare | |
243 | 2.1 cc generates temporary symbols that start with .X, so we | |
244 | recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
245 | If so, we should move the .X recognition into | |
246 | _bfd_elf_is_local_label_name. */ | |
247 | ||
248 | static boolean | |
249 | elf_i386_is_local_label_name (abfd, name) | |
250 | bfd *abfd; | |
251 | const char *name; | |
252 | { | |
253 | if (name[0] == '.' && name[1] == 'X') | |
254 | return true; | |
255 | ||
256 | return _bfd_elf_is_local_label_name (abfd, name); | |
257 | } | |
258 | \f | |
259 | /* Functions for the i386 ELF linker. */ | |
260 | ||
261 | /* The name of the dynamic interpreter. This is put in the .interp | |
262 | section. */ | |
263 | ||
264 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
265 | ||
266 | /* The size in bytes of an entry in the procedure linkage table. */ | |
267 | ||
268 | #define PLT_ENTRY_SIZE 16 | |
269 | ||
270 | /* The first entry in an absolute procedure linkage table looks like | |
271 | this. See the SVR4 ABI i386 supplement to see how this works. */ | |
272 | ||
273 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = | |
274 | { | |
275 | 0xff, 0x35, /* pushl contents of address */ | |
276 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ | |
277 | 0xff, 0x25, /* jmp indirect */ | |
278 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ | |
279 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
280 | }; | |
281 | ||
282 | /* Subsequent entries in an absolute procedure linkage table look like | |
283 | this. */ | |
284 | ||
285 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = | |
286 | { | |
287 | 0xff, 0x25, /* jmp indirect */ | |
288 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ | |
289 | 0x68, /* pushl immediate */ | |
290 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
291 | 0xe9, /* jmp relative */ | |
292 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
293 | }; | |
294 | ||
295 | /* The first entry in a PIC procedure linkage table look like this. */ | |
296 | ||
297 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = | |
298 | { | |
299 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ | |
300 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ | |
301 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
302 | }; | |
303 | ||
304 | /* Subsequent entries in a PIC procedure linkage table look like this. */ | |
305 | ||
306 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = | |
307 | { | |
308 | 0xff, 0xa3, /* jmp *offset(%ebx) */ | |
309 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ | |
310 | 0x68, /* pushl immediate */ | |
311 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
312 | 0xe9, /* jmp relative */ | |
313 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
314 | }; | |
315 | ||
316 | /* The i386 linker needs to keep track of the number of relocs that it | |
317 | decides to copy in check_relocs for each symbol. This is so that | |
318 | it can discard PC relative relocs if it doesn't need them when | |
319 | linking with -Bsymbolic. We store the information in a field | |
320 | extending the regular ELF linker hash table. */ | |
321 | ||
322 | /* This structure keeps track of the number of PC relative relocs we | |
323 | have copied for a given symbol. */ | |
324 | ||
325 | struct elf_i386_pcrel_relocs_copied | |
326 | { | |
327 | /* Next section. */ | |
328 | struct elf_i386_pcrel_relocs_copied *next; | |
329 | /* A section in dynobj. */ | |
330 | asection *section; | |
331 | /* Number of relocs copied in this section. */ | |
332 | bfd_size_type count; | |
333 | }; | |
334 | ||
335 | /* i386 ELF linker hash entry. */ | |
336 | ||
337 | struct elf_i386_link_hash_entry | |
338 | { | |
339 | struct elf_link_hash_entry root; | |
340 | ||
341 | /* Number of PC relative relocs copied for this symbol. */ | |
342 | struct elf_i386_pcrel_relocs_copied *pcrel_relocs_copied; | |
343 | }; | |
344 | ||
345 | /* i386 ELF linker hash table. */ | |
346 | ||
347 | struct elf_i386_link_hash_table | |
348 | { | |
349 | struct elf_link_hash_table root; | |
350 | }; | |
351 | ||
352 | /* Declare this now that the above structures are defined. */ | |
353 | ||
354 | static boolean elf_i386_discard_copies | |
355 | PARAMS ((struct elf_i386_link_hash_entry *, PTR)); | |
356 | ||
357 | /* Traverse an i386 ELF linker hash table. */ | |
358 | ||
359 | #define elf_i386_link_hash_traverse(table, func, info) \ | |
360 | (elf_link_hash_traverse \ | |
361 | (&(table)->root, \ | |
362 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
363 | (info))) | |
364 | ||
365 | /* Get the i386 ELF linker hash table from a link_info structure. */ | |
366 | ||
367 | #define elf_i386_hash_table(p) \ | |
368 | ((struct elf_i386_link_hash_table *) ((p)->hash)) | |
369 | ||
370 | /* Create an entry in an i386 ELF linker hash table. */ | |
371 | ||
372 | static struct bfd_hash_entry * | |
373 | elf_i386_link_hash_newfunc (entry, table, string) | |
374 | struct bfd_hash_entry *entry; | |
375 | struct bfd_hash_table *table; | |
376 | const char *string; | |
377 | { | |
378 | struct elf_i386_link_hash_entry *ret = | |
379 | (struct elf_i386_link_hash_entry *) entry; | |
380 | ||
381 | /* Allocate the structure if it has not already been allocated by a | |
382 | subclass. */ | |
383 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
384 | ret = ((struct elf_i386_link_hash_entry *) | |
385 | bfd_hash_allocate (table, | |
386 | sizeof (struct elf_i386_link_hash_entry))); | |
387 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
388 | return (struct bfd_hash_entry *) ret; | |
389 | ||
390 | /* Call the allocation method of the superclass. */ | |
391 | ret = ((struct elf_i386_link_hash_entry *) | |
392 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
393 | table, string)); | |
394 | if (ret != (struct elf_i386_link_hash_entry *) NULL) | |
395 | { | |
396 | ret->pcrel_relocs_copied = NULL; | |
397 | } | |
398 | ||
399 | return (struct bfd_hash_entry *) ret; | |
400 | } | |
401 | ||
402 | /* Create an i386 ELF linker hash table. */ | |
403 | ||
404 | static struct bfd_link_hash_table * | |
405 | elf_i386_link_hash_table_create (abfd) | |
406 | bfd *abfd; | |
407 | { | |
408 | struct elf_i386_link_hash_table *ret; | |
409 | ||
410 | ret = ((struct elf_i386_link_hash_table *) | |
411 | bfd_alloc (abfd, sizeof (struct elf_i386_link_hash_table))); | |
412 | if (ret == (struct elf_i386_link_hash_table *) NULL) | |
413 | return NULL; | |
414 | ||
415 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
416 | elf_i386_link_hash_newfunc)) | |
417 | { | |
418 | bfd_release (abfd, ret); | |
419 | return NULL; | |
420 | } | |
421 | ||
422 | return &ret->root.root; | |
423 | } | |
424 | ||
425 | /* Look through the relocs for a section during the first phase, and | |
426 | allocate space in the global offset table or procedure linkage | |
427 | table. */ | |
428 | ||
429 | static boolean | |
430 | elf_i386_check_relocs (abfd, info, sec, relocs) | |
431 | bfd *abfd; | |
432 | struct bfd_link_info *info; | |
433 | asection *sec; | |
434 | const Elf_Internal_Rela *relocs; | |
435 | { | |
436 | bfd *dynobj; | |
437 | Elf_Internal_Shdr *symtab_hdr; | |
438 | struct elf_link_hash_entry **sym_hashes; | |
439 | bfd_vma *local_got_offsets; | |
440 | const Elf_Internal_Rela *rel; | |
441 | const Elf_Internal_Rela *rel_end; | |
442 | asection *sgot; | |
443 | asection *srelgot; | |
444 | asection *sreloc; | |
445 | ||
446 | if (info->relocateable) | |
447 | return true; | |
448 | ||
449 | dynobj = elf_hash_table (info)->dynobj; | |
450 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
451 | sym_hashes = elf_sym_hashes (abfd); | |
452 | local_got_offsets = elf_local_got_offsets (abfd); | |
453 | ||
454 | sgot = NULL; | |
455 | srelgot = NULL; | |
456 | sreloc = NULL; | |
457 | ||
458 | rel_end = relocs + sec->reloc_count; | |
459 | for (rel = relocs; rel < rel_end; rel++) | |
460 | { | |
461 | unsigned long r_symndx; | |
462 | struct elf_link_hash_entry *h; | |
463 | ||
464 | r_symndx = ELF32_R_SYM (rel->r_info); | |
465 | ||
466 | if (r_symndx < symtab_hdr->sh_info) | |
467 | h = NULL; | |
468 | else | |
469 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
470 | ||
471 | /* Some relocs require a global offset table. */ | |
472 | if (dynobj == NULL) | |
473 | { | |
474 | switch (ELF32_R_TYPE (rel->r_info)) | |
475 | { | |
476 | case R_386_GOT32: | |
477 | case R_386_GOTOFF: | |
478 | case R_386_GOTPC: | |
479 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
480 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
481 | return false; | |
482 | break; | |
483 | ||
484 | default: | |
485 | break; | |
486 | } | |
487 | } | |
488 | ||
489 | switch (ELF32_R_TYPE (rel->r_info)) | |
490 | { | |
491 | case R_386_GOT32: | |
492 | /* This symbol requires a global offset table entry. */ | |
493 | ||
494 | if (sgot == NULL) | |
495 | { | |
496 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
497 | BFD_ASSERT (sgot != NULL); | |
498 | } | |
499 | ||
500 | if (srelgot == NULL | |
501 | && (h != NULL || info->shared)) | |
502 | { | |
503 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
504 | if (srelgot == NULL) | |
505 | { | |
506 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
507 | if (srelgot == NULL | |
508 | || ! bfd_set_section_flags (dynobj, srelgot, | |
509 | (SEC_ALLOC | |
510 | | SEC_LOAD | |
511 | | SEC_HAS_CONTENTS | |
512 | | SEC_IN_MEMORY | |
513 | | SEC_LINKER_CREATED | |
514 | | SEC_READONLY)) | |
515 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
516 | return false; | |
517 | } | |
518 | } | |
519 | ||
520 | if (h != NULL) | |
521 | { | |
522 | if (h->got.offset != (bfd_vma) -1) | |
523 | { | |
524 | /* We have already allocated space in the .got. */ | |
525 | break; | |
526 | } | |
527 | h->got.offset = sgot->_raw_size; | |
528 | ||
529 | /* Make sure this symbol is output as a dynamic symbol. */ | |
530 | if (h->dynindx == -1) | |
531 | { | |
532 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
533 | return false; | |
534 | } | |
535 | ||
536 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
537 | } | |
538 | else | |
539 | { | |
540 | /* This is a global offset table entry for a local | |
541 | symbol. */ | |
542 | if (local_got_offsets == NULL) | |
543 | { | |
544 | size_t size; | |
545 | register unsigned int i; | |
546 | ||
547 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
548 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
549 | if (local_got_offsets == NULL) | |
550 | return false; | |
551 | elf_local_got_offsets (abfd) = local_got_offsets; | |
552 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
553 | local_got_offsets[i] = (bfd_vma) -1; | |
554 | } | |
555 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) | |
556 | { | |
557 | /* We have already allocated space in the .got. */ | |
558 | break; | |
559 | } | |
560 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
561 | ||
562 | if (info->shared) | |
563 | { | |
564 | /* If we are generating a shared object, we need to | |
565 | output a R_386_RELATIVE reloc so that the dynamic | |
566 | linker can adjust this GOT entry. */ | |
567 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
568 | } | |
569 | } | |
570 | ||
571 | sgot->_raw_size += 4; | |
572 | ||
573 | break; | |
574 | ||
575 | case R_386_PLT32: | |
576 | /* This symbol requires a procedure linkage table entry. We | |
577 | actually build the entry in adjust_dynamic_symbol, | |
578 | because this might be a case of linking PIC code which is | |
579 | never referenced by a dynamic object, in which case we | |
580 | don't need to generate a procedure linkage table entry | |
581 | after all. */ | |
582 | ||
583 | /* If this is a local symbol, we resolve it directly without | |
584 | creating a procedure linkage table entry. */ | |
585 | if (h == NULL) | |
586 | continue; | |
587 | ||
588 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
589 | ||
590 | break; | |
591 | ||
592 | case R_386_32: | |
593 | case R_386_PC32: | |
594 | /* If we are creating a shared library, and this is a reloc | |
595 | against a global symbol, or a non PC relative reloc | |
596 | against a local symbol, then we need to copy the reloc | |
597 | into the shared library. However, if we are linking with | |
598 | -Bsymbolic, we do not need to copy a reloc against a | |
599 | global symbol which is defined in an object we are | |
600 | including in the link (i.e., DEF_REGULAR is set). At | |
601 | this point we have not seen all the input files, so it is | |
602 | possible that DEF_REGULAR is not set now but will be set | |
603 | later (it is never cleared). We account for that | |
604 | possibility below by storing information in the | |
605 | pcrel_relocs_copied field of the hash table entry. */ | |
606 | if (info->shared | |
607 | && (sec->flags & SEC_ALLOC) != 0 | |
608 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 | |
609 | || (h != NULL | |
610 | && (! info->symbolic | |
611 | || (h->elf_link_hash_flags | |
612 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
613 | { | |
614 | /* When creating a shared object, we must copy these | |
615 | reloc types into the output file. We create a reloc | |
616 | section in dynobj and make room for this reloc. */ | |
617 | if (sreloc == NULL) | |
618 | { | |
619 | const char *name; | |
620 | ||
621 | name = (bfd_elf_string_from_elf_section | |
622 | (abfd, | |
623 | elf_elfheader (abfd)->e_shstrndx, | |
624 | elf_section_data (sec)->rel_hdr.sh_name)); | |
625 | if (name == NULL) | |
626 | return false; | |
627 | ||
628 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
629 | && strcmp (bfd_get_section_name (abfd, sec), | |
630 | name + 4) == 0); | |
631 | ||
632 | sreloc = bfd_get_section_by_name (dynobj, name); | |
633 | if (sreloc == NULL) | |
634 | { | |
635 | flagword flags; | |
636 | ||
637 | sreloc = bfd_make_section (dynobj, name); | |
638 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
639 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
640 | if ((sec->flags & SEC_ALLOC) != 0) | |
641 | flags |= SEC_ALLOC | SEC_LOAD; | |
642 | if (sreloc == NULL | |
643 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
644 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
645 | return false; | |
646 | } | |
647 | } | |
648 | ||
649 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
650 | ||
651 | /* If we are linking with -Bsymbolic, and this is a | |
652 | global symbol, we count the number of PC relative | |
653 | relocations we have entered for this symbol, so that | |
654 | we can discard them again if the symbol is later | |
655 | defined by a regular object. Note that this function | |
656 | is only called if we are using an elf_i386 linker | |
657 | hash table, which means that h is really a pointer to | |
658 | an elf_i386_link_hash_entry. */ | |
659 | if (h != NULL && info->symbolic | |
660 | && ELF32_R_TYPE (rel->r_info) == R_386_PC32) | |
661 | { | |
662 | struct elf_i386_link_hash_entry *eh; | |
663 | struct elf_i386_pcrel_relocs_copied *p; | |
664 | ||
665 | eh = (struct elf_i386_link_hash_entry *) h; | |
666 | ||
667 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
668 | if (p->section == sreloc) | |
669 | break; | |
670 | ||
671 | if (p == NULL) | |
672 | { | |
673 | p = ((struct elf_i386_pcrel_relocs_copied *) | |
674 | bfd_alloc (dynobj, sizeof *p)); | |
675 | if (p == NULL) | |
676 | return false; | |
677 | p->next = eh->pcrel_relocs_copied; | |
678 | eh->pcrel_relocs_copied = p; | |
679 | p->section = sreloc; | |
680 | p->count = 0; | |
681 | } | |
682 | ||
683 | ++p->count; | |
684 | } | |
685 | } | |
686 | ||
687 | break; | |
688 | ||
689 | /* This relocation describes the C++ object vtable hierarchy. | |
690 | Reconstruct it for later use during GC. */ | |
691 | case R_386_GNU_VTINHERIT: | |
692 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
693 | return false; | |
694 | break; | |
695 | ||
696 | /* This relocation describes which C++ vtable entries are actually | |
697 | used. Record for later use during GC. */ | |
698 | case R_386_GNU_VTENTRY: | |
699 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) | |
700 | return false; | |
701 | break; | |
702 | ||
703 | default: | |
704 | break; | |
705 | } | |
706 | } | |
707 | ||
708 | return true; | |
709 | } | |
710 | ||
711 | /* Return the section that should be marked against GC for a given | |
712 | relocation. */ | |
713 | ||
714 | static asection * | |
715 | elf_i386_gc_mark_hook (abfd, info, rel, h, sym) | |
716 | bfd *abfd; | |
7442e600 | 717 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
718 | Elf_Internal_Rela *rel; |
719 | struct elf_link_hash_entry *h; | |
720 | Elf_Internal_Sym *sym; | |
721 | { | |
722 | if (h != NULL) | |
723 | { | |
724 | switch (ELF32_R_TYPE (rel->r_info)) | |
725 | { | |
726 | case R_386_GNU_VTINHERIT: | |
727 | case R_386_GNU_VTENTRY: | |
728 | break; | |
729 | ||
730 | default: | |
731 | switch (h->root.type) | |
732 | { | |
733 | case bfd_link_hash_defined: | |
734 | case bfd_link_hash_defweak: | |
735 | return h->root.u.def.section; | |
736 | ||
737 | case bfd_link_hash_common: | |
738 | return h->root.u.c.p->section; | |
739 | ||
740 | default: | |
741 | break; | |
742 | } | |
743 | } | |
744 | } | |
745 | else | |
746 | { | |
747 | if (!(elf_bad_symtab (abfd) | |
748 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
749 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
750 | && sym->st_shndx != SHN_COMMON)) | |
751 | { | |
752 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
753 | } | |
754 | } | |
755 | ||
756 | return NULL; | |
757 | } | |
758 | ||
759 | /* Update the got entry reference counts for the section being removed. */ | |
760 | ||
761 | static boolean | |
762 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) | |
7442e600 ILT |
763 | bfd *abfd ATTRIBUTE_UNUSED; |
764 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
765 | asection *sec ATTRIBUTE_UNUSED; | |
766 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
252b5132 RH |
767 | { |
768 | /* ??? It would seem that the existing i386 code does no sort | |
769 | of reference counting or whatnot on its GOT and PLT entries, | |
770 | so it is not possible to garbage collect them at this time. */ | |
771 | ||
772 | return true; | |
773 | } | |
774 | ||
775 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
776 | regular object. The current definition is in some section of the | |
777 | dynamic object, but we're not including those sections. We have to | |
778 | change the definition to something the rest of the link can | |
779 | understand. */ | |
780 | ||
781 | static boolean | |
782 | elf_i386_adjust_dynamic_symbol (info, h) | |
783 | struct bfd_link_info *info; | |
784 | struct elf_link_hash_entry *h; | |
785 | { | |
786 | bfd *dynobj; | |
787 | asection *s; | |
788 | unsigned int power_of_two; | |
789 | ||
790 | dynobj = elf_hash_table (info)->dynobj; | |
791 | ||
792 | /* Make sure we know what is going on here. */ | |
793 | BFD_ASSERT (dynobj != NULL | |
794 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
795 | || h->weakdef != NULL | |
796 | || ((h->elf_link_hash_flags | |
797 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
798 | && (h->elf_link_hash_flags | |
799 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
800 | && (h->elf_link_hash_flags | |
801 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
802 | ||
803 | /* If this is a function, put it in the procedure linkage table. We | |
804 | will fill in the contents of the procedure linkage table later, | |
805 | when we know the address of the .got section. */ | |
806 | if (h->type == STT_FUNC | |
807 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
808 | { | |
809 | if (! info->shared | |
810 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
811 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
812 | { | |
813 | /* This case can occur if we saw a PLT32 reloc in an input | |
814 | file, but the symbol was never referred to by a dynamic | |
815 | object. In such a case, we don't actually need to build | |
816 | a procedure linkage table, and we can just do a PC32 | |
817 | reloc instead. */ | |
818 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
819 | return true; | |
820 | } | |
821 | ||
822 | /* Make sure this symbol is output as a dynamic symbol. */ | |
823 | if (h->dynindx == -1) | |
824 | { | |
825 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
826 | return false; | |
827 | } | |
828 | ||
829 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
830 | BFD_ASSERT (s != NULL); | |
831 | ||
832 | /* If this is the first .plt entry, make room for the special | |
833 | first entry. */ | |
834 | if (s->_raw_size == 0) | |
835 | s->_raw_size += PLT_ENTRY_SIZE; | |
836 | ||
837 | /* If this symbol is not defined in a regular file, and we are | |
838 | not generating a shared library, then set the symbol to this | |
839 | location in the .plt. This is required to make function | |
840 | pointers compare as equal between the normal executable and | |
841 | the shared library. */ | |
842 | if (! info->shared | |
843 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
844 | { | |
845 | h->root.u.def.section = s; | |
846 | h->root.u.def.value = s->_raw_size; | |
847 | } | |
848 | ||
849 | h->plt.offset = s->_raw_size; | |
850 | ||
851 | /* Make room for this entry. */ | |
852 | s->_raw_size += PLT_ENTRY_SIZE; | |
853 | ||
854 | /* We also need to make an entry in the .got.plt section, which | |
855 | will be placed in the .got section by the linker script. */ | |
856 | ||
857 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
858 | BFD_ASSERT (s != NULL); | |
859 | s->_raw_size += 4; | |
860 | ||
861 | /* We also need to make an entry in the .rel.plt section. */ | |
862 | ||
863 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
864 | BFD_ASSERT (s != NULL); | |
865 | s->_raw_size += sizeof (Elf32_External_Rel); | |
866 | ||
867 | return true; | |
868 | } | |
869 | ||
870 | /* If this is a weak symbol, and there is a real definition, the | |
871 | processor independent code will have arranged for us to see the | |
872 | real definition first, and we can just use the same value. */ | |
873 | if (h->weakdef != NULL) | |
874 | { | |
875 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
876 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
877 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
878 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
879 | return true; | |
880 | } | |
881 | ||
882 | /* This is a reference to a symbol defined by a dynamic object which | |
883 | is not a function. */ | |
884 | ||
885 | /* If we are creating a shared library, we must presume that the | |
886 | only references to the symbol are via the global offset table. | |
887 | For such cases we need not do anything here; the relocations will | |
888 | be handled correctly by relocate_section. */ | |
889 | if (info->shared) | |
890 | return true; | |
891 | ||
892 | /* We must allocate the symbol in our .dynbss section, which will | |
893 | become part of the .bss section of the executable. There will be | |
894 | an entry for this symbol in the .dynsym section. The dynamic | |
895 | object will contain position independent code, so all references | |
896 | from the dynamic object to this symbol will go through the global | |
897 | offset table. The dynamic linker will use the .dynsym entry to | |
898 | determine the address it must put in the global offset table, so | |
899 | both the dynamic object and the regular object will refer to the | |
900 | same memory location for the variable. */ | |
901 | ||
902 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
903 | BFD_ASSERT (s != NULL); | |
904 | ||
905 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to | |
906 | copy the initial value out of the dynamic object and into the | |
907 | runtime process image. We need to remember the offset into the | |
908 | .rel.bss section we are going to use. */ | |
909 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
910 | { | |
911 | asection *srel; | |
912 | ||
913 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
914 | BFD_ASSERT (srel != NULL); | |
915 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
916 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
917 | } | |
918 | ||
919 | /* We need to figure out the alignment required for this symbol. I | |
920 | have no idea how ELF linkers handle this. */ | |
921 | power_of_two = bfd_log2 (h->size); | |
922 | if (power_of_two > 3) | |
923 | power_of_two = 3; | |
924 | ||
925 | /* Apply the required alignment. */ | |
926 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
927 | (bfd_size_type) (1 << power_of_two)); | |
928 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
929 | { | |
930 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
931 | return false; | |
932 | } | |
933 | ||
934 | /* Define the symbol as being at this point in the section. */ | |
935 | h->root.u.def.section = s; | |
936 | h->root.u.def.value = s->_raw_size; | |
937 | ||
938 | /* Increment the section size to make room for the symbol. */ | |
939 | s->_raw_size += h->size; | |
940 | ||
941 | return true; | |
942 | } | |
943 | ||
944 | /* Set the sizes of the dynamic sections. */ | |
945 | ||
946 | static boolean | |
947 | elf_i386_size_dynamic_sections (output_bfd, info) | |
948 | bfd *output_bfd; | |
949 | struct bfd_link_info *info; | |
950 | { | |
951 | bfd *dynobj; | |
952 | asection *s; | |
953 | boolean plt; | |
954 | boolean relocs; | |
955 | boolean reltext; | |
956 | ||
957 | dynobj = elf_hash_table (info)->dynobj; | |
958 | BFD_ASSERT (dynobj != NULL); | |
959 | ||
960 | if (elf_hash_table (info)->dynamic_sections_created) | |
961 | { | |
962 | /* Set the contents of the .interp section to the interpreter. */ | |
963 | if (! info->shared) | |
964 | { | |
965 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
966 | BFD_ASSERT (s != NULL); | |
967 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
968 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
969 | } | |
970 | } | |
971 | else | |
972 | { | |
973 | /* We may have created entries in the .rel.got section. | |
974 | However, if we are not creating the dynamic sections, we will | |
975 | not actually use these entries. Reset the size of .rel.got, | |
976 | which will cause it to get stripped from the output file | |
977 | below. */ | |
978 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
979 | if (s != NULL) | |
980 | s->_raw_size = 0; | |
981 | } | |
982 | ||
983 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
984 | PC relative relocs against symbols defined in a regular object. | |
985 | We allocated space for them in the check_relocs routine, but we | |
986 | will not fill them in in the relocate_section routine. */ | |
987 | if (info->shared && info->symbolic) | |
988 | elf_i386_link_hash_traverse (elf_i386_hash_table (info), | |
989 | elf_i386_discard_copies, | |
990 | (PTR) NULL); | |
991 | ||
992 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
993 | determined the sizes of the various dynamic sections. Allocate | |
994 | memory for them. */ | |
995 | plt = false; | |
996 | relocs = false; | |
997 | reltext = false; | |
998 | for (s = dynobj->sections; s != NULL; s = s->next) | |
999 | { | |
1000 | const char *name; | |
1001 | boolean strip; | |
1002 | ||
1003 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1004 | continue; | |
1005 | ||
1006 | /* It's OK to base decisions on the section name, because none | |
1007 | of the dynobj section names depend upon the input files. */ | |
1008 | name = bfd_get_section_name (dynobj, s); | |
1009 | ||
1010 | strip = false; | |
1011 | ||
1012 | if (strcmp (name, ".plt") == 0) | |
1013 | { | |
1014 | if (s->_raw_size == 0) | |
1015 | { | |
1016 | /* Strip this section if we don't need it; see the | |
1017 | comment below. */ | |
1018 | strip = true; | |
1019 | } | |
1020 | else | |
1021 | { | |
1022 | /* Remember whether there is a PLT. */ | |
1023 | plt = true; | |
1024 | } | |
1025 | } | |
1026 | else if (strncmp (name, ".rel", 4) == 0) | |
1027 | { | |
1028 | if (s->_raw_size == 0) | |
1029 | { | |
1030 | /* If we don't need this section, strip it from the | |
1031 | output file. This is mostly to handle .rel.bss and | |
1032 | .rel.plt. We must create both sections in | |
1033 | create_dynamic_sections, because they must be created | |
1034 | before the linker maps input sections to output | |
1035 | sections. The linker does that before | |
1036 | adjust_dynamic_symbol is called, and it is that | |
1037 | function which decides whether anything needs to go | |
1038 | into these sections. */ | |
1039 | strip = true; | |
1040 | } | |
1041 | else | |
1042 | { | |
1043 | asection *target; | |
1044 | ||
1045 | /* Remember whether there are any reloc sections other | |
1046 | than .rel.plt. */ | |
1047 | if (strcmp (name, ".rel.plt") != 0) | |
1048 | { | |
1049 | const char *outname; | |
1050 | ||
1051 | relocs = true; | |
1052 | ||
1053 | /* If this relocation section applies to a read only | |
1054 | section, then we probably need a DT_TEXTREL | |
1055 | entry. The entries in the .rel.plt section | |
1056 | really apply to the .got section, which we | |
1057 | created ourselves and so know is not readonly. */ | |
1058 | outname = bfd_get_section_name (output_bfd, | |
1059 | s->output_section); | |
1060 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
1061 | if (target != NULL | |
1062 | && (target->flags & SEC_READONLY) != 0 | |
1063 | && (target->flags & SEC_ALLOC) != 0) | |
1064 | reltext = true; | |
1065 | } | |
1066 | ||
1067 | /* We use the reloc_count field as a counter if we need | |
1068 | to copy relocs into the output file. */ | |
1069 | s->reloc_count = 0; | |
1070 | } | |
1071 | } | |
1072 | else if (strncmp (name, ".got", 4) != 0) | |
1073 | { | |
1074 | /* It's not one of our sections, so don't allocate space. */ | |
1075 | continue; | |
1076 | } | |
1077 | ||
1078 | if (strip) | |
1079 | { | |
1080 | _bfd_strip_section_from_output (s); | |
1081 | continue; | |
1082 | } | |
1083 | ||
1084 | /* Allocate memory for the section contents. */ | |
1085 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); | |
1086 | if (s->contents == NULL && s->_raw_size != 0) | |
1087 | return false; | |
1088 | } | |
1089 | ||
1090 | if (elf_hash_table (info)->dynamic_sections_created) | |
1091 | { | |
1092 | /* Add some entries to the .dynamic section. We fill in the | |
1093 | values later, in elf_i386_finish_dynamic_sections, but we | |
1094 | must add the entries now so that we get the correct size for | |
1095 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1096 | dynamic linker and used by the debugger. */ | |
1097 | if (! info->shared) | |
1098 | { | |
1099 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
1100 | return false; | |
1101 | } | |
1102 | ||
1103 | if (plt) | |
1104 | { | |
1105 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
1106 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
1107 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
1108 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
1109 | return false; | |
1110 | } | |
1111 | ||
1112 | if (relocs) | |
1113 | { | |
1114 | if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) | |
1115 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) | |
1116 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
1117 | sizeof (Elf32_External_Rel))) | |
1118 | return false; | |
1119 | } | |
1120 | ||
1121 | if (reltext) | |
1122 | { | |
1123 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
1124 | return false; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | return true; | |
1129 | } | |
1130 | ||
1131 | /* This function is called via elf_i386_link_hash_traverse if we are | |
1132 | creating a shared object with -Bsymbolic. It discards the space | |
1133 | allocated to copy PC relative relocs against symbols which are | |
1134 | defined in regular objects. We allocated space for them in the | |
1135 | check_relocs routine, but we won't fill them in in the | |
1136 | relocate_section routine. */ | |
1137 | ||
1138 | /*ARGSUSED*/ | |
1139 | static boolean | |
1140 | elf_i386_discard_copies (h, ignore) | |
1141 | struct elf_i386_link_hash_entry *h; | |
7442e600 | 1142 | PTR ignore ATTRIBUTE_UNUSED; |
252b5132 RH |
1143 | { |
1144 | struct elf_i386_pcrel_relocs_copied *s; | |
1145 | ||
1146 | /* We only discard relocs for symbols defined in a regular object. */ | |
1147 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1148 | return true; | |
1149 | ||
1150 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
1151 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
1152 | ||
1153 | return true; | |
1154 | } | |
1155 | ||
1156 | /* Relocate an i386 ELF section. */ | |
1157 | ||
1158 | static boolean | |
1159 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, | |
1160 | contents, relocs, local_syms, local_sections) | |
1161 | bfd *output_bfd; | |
1162 | struct bfd_link_info *info; | |
1163 | bfd *input_bfd; | |
1164 | asection *input_section; | |
1165 | bfd_byte *contents; | |
1166 | Elf_Internal_Rela *relocs; | |
1167 | Elf_Internal_Sym *local_syms; | |
1168 | asection **local_sections; | |
1169 | { | |
1170 | bfd *dynobj; | |
1171 | Elf_Internal_Shdr *symtab_hdr; | |
1172 | struct elf_link_hash_entry **sym_hashes; | |
1173 | bfd_vma *local_got_offsets; | |
1174 | asection *sgot; | |
1175 | asection *splt; | |
1176 | asection *sreloc; | |
1177 | Elf_Internal_Rela *rel; | |
1178 | Elf_Internal_Rela *relend; | |
1179 | ||
1180 | dynobj = elf_hash_table (info)->dynobj; | |
1181 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
1182 | sym_hashes = elf_sym_hashes (input_bfd); | |
1183 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1184 | ||
1185 | sgot = NULL; | |
1186 | splt = NULL; | |
1187 | sreloc = NULL; | |
1188 | ||
1189 | rel = relocs; | |
1190 | relend = relocs + input_section->reloc_count; | |
1191 | for (; rel < relend; rel++) | |
1192 | { | |
1193 | int r_type; | |
1194 | reloc_howto_type *howto; | |
1195 | unsigned long r_symndx; | |
1196 | struct elf_link_hash_entry *h; | |
1197 | Elf_Internal_Sym *sym; | |
1198 | asection *sec; | |
1199 | bfd_vma relocation; | |
1200 | bfd_reloc_status_type r; | |
1201 | ||
1202 | r_type = ELF32_R_TYPE (rel->r_info); | |
1203 | if (r_type == R_386_GNU_VTINHERIT | |
1204 | || r_type == R_386_GNU_VTENTRY) | |
1205 | continue; | |
1206 | if (r_type < 0 | |
1207 | || r_type >= (int) R_386_max | |
1208 | || (r_type >= (int) FIRST_INVALID_RELOC | |
1209 | && r_type <= (int) LAST_INVALID_RELOC)) | |
1210 | { | |
1211 | bfd_set_error (bfd_error_bad_value); | |
1212 | return false; | |
1213 | } | |
1214 | howto = elf_howto_table + r_type; | |
1215 | ||
1216 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1217 | ||
1218 | if (info->relocateable) | |
1219 | { | |
1220 | /* This is a relocateable link. We don't have to change | |
1221 | anything, unless the reloc is against a section symbol, | |
1222 | in which case we have to adjust according to where the | |
1223 | section symbol winds up in the output section. */ | |
1224 | if (r_symndx < symtab_hdr->sh_info) | |
1225 | { | |
1226 | sym = local_syms + r_symndx; | |
1227 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1228 | { | |
1229 | bfd_vma val; | |
1230 | ||
1231 | sec = local_sections[r_symndx]; | |
1232 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
1233 | val += sec->output_offset + sym->st_value; | |
1234 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | continue; | |
1239 | } | |
1240 | ||
1241 | /* This is a final link. */ | |
1242 | h = NULL; | |
1243 | sym = NULL; | |
1244 | sec = NULL; | |
1245 | if (r_symndx < symtab_hdr->sh_info) | |
1246 | { | |
1247 | sym = local_syms + r_symndx; | |
1248 | sec = local_sections[r_symndx]; | |
1249 | relocation = (sec->output_section->vma | |
1250 | + sec->output_offset | |
1251 | + sym->st_value); | |
1252 | } | |
1253 | else | |
1254 | { | |
1255 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1256 | while (h->root.type == bfd_link_hash_indirect | |
1257 | || h->root.type == bfd_link_hash_warning) | |
1258 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1259 | if (h->root.type == bfd_link_hash_defined | |
1260 | || h->root.type == bfd_link_hash_defweak) | |
1261 | { | |
1262 | sec = h->root.u.def.section; | |
1263 | if (r_type == R_386_GOTPC | |
1264 | || (r_type == R_386_PLT32 | |
1265 | && h->plt.offset != (bfd_vma) -1) | |
1266 | || (r_type == R_386_GOT32 | |
1267 | && elf_hash_table (info)->dynamic_sections_created | |
1268 | && (! info->shared | |
1269 | || (! info->symbolic && h->dynindx != -1) | |
1270 | || (h->elf_link_hash_flags | |
1271 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1272 | || (info->shared | |
1273 | && ((! info->symbolic && h->dynindx != -1) | |
1274 | || (h->elf_link_hash_flags | |
1275 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1276 | && (r_type == R_386_32 | |
1277 | || r_type == R_386_PC32) | |
1278 | && ((input_section->flags & SEC_ALLOC) != 0 | |
1279 | /* DWARF will emit R_386_32 relocations in its | |
1280 | sections against symbols defined externally | |
1281 | in shared libraries. We can't do anything | |
1282 | with them here. */ | |
1283 | || (input_section->flags & SEC_DEBUGGING) != 0))) | |
1284 | { | |
1285 | /* In these cases, we don't need the relocation | |
1286 | value. We check specially because in some | |
1287 | obscure cases sec->output_section will be NULL. */ | |
1288 | relocation = 0; | |
1289 | } | |
1290 | else if (sec->output_section == NULL) | |
1291 | { | |
1292 | (*_bfd_error_handler) | |
1293 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
1294 | bfd_get_filename (input_bfd), h->root.root.string, | |
1295 | bfd_get_section_name (input_bfd, input_section)); | |
1296 | relocation = 0; | |
1297 | } | |
1298 | else | |
1299 | relocation = (h->root.u.def.value | |
1300 | + sec->output_section->vma | |
1301 | + sec->output_offset); | |
1302 | } | |
1303 | else if (h->root.type == bfd_link_hash_undefweak) | |
1304 | relocation = 0; | |
1305 | else if (info->shared && !info->symbolic && !info->no_undefined) | |
1306 | relocation = 0; | |
1307 | else | |
1308 | { | |
1309 | if (! ((*info->callbacks->undefined_symbol) | |
1310 | (info, h->root.root.string, input_bfd, | |
1311 | input_section, rel->r_offset))) | |
1312 | return false; | |
1313 | relocation = 0; | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | switch (r_type) | |
1318 | { | |
1319 | case R_386_GOT32: | |
1320 | /* Relocation is to the entry for this symbol in the global | |
1321 | offset table. */ | |
1322 | if (sgot == NULL) | |
1323 | { | |
1324 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1325 | BFD_ASSERT (sgot != NULL); | |
1326 | } | |
1327 | ||
1328 | if (h != NULL) | |
1329 | { | |
1330 | bfd_vma off; | |
1331 | ||
1332 | off = h->got.offset; | |
1333 | BFD_ASSERT (off != (bfd_vma) -1); | |
1334 | ||
1335 | if (! elf_hash_table (info)->dynamic_sections_created | |
1336 | || (info->shared | |
1337 | && (info->symbolic || h->dynindx == -1) | |
1338 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1339 | { | |
1340 | /* This is actually a static link, or it is a | |
1341 | -Bsymbolic link and the symbol is defined | |
1342 | locally, or the symbol was forced to be local | |
1343 | because of a version file. We must initialize | |
1344 | this entry in the global offset table. Since the | |
1345 | offset must always be a multiple of 4, we use the | |
1346 | least significant bit to record whether we have | |
1347 | initialized it already. | |
1348 | ||
1349 | When doing a dynamic link, we create a .rel.got | |
1350 | relocation entry to initialize the value. This | |
1351 | is done in the finish_dynamic_symbol routine. */ | |
1352 | if ((off & 1) != 0) | |
1353 | off &= ~1; | |
1354 | else | |
1355 | { | |
1356 | bfd_put_32 (output_bfd, relocation, | |
1357 | sgot->contents + off); | |
1358 | h->got.offset |= 1; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | relocation = sgot->output_offset + off; | |
1363 | } | |
1364 | else | |
1365 | { | |
1366 | bfd_vma off; | |
1367 | ||
1368 | BFD_ASSERT (local_got_offsets != NULL | |
1369 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1370 | ||
1371 | off = local_got_offsets[r_symndx]; | |
1372 | ||
1373 | /* The offset must always be a multiple of 4. We use | |
1374 | the least significant bit to record whether we have | |
1375 | already generated the necessary reloc. */ | |
1376 | if ((off & 1) != 0) | |
1377 | off &= ~1; | |
1378 | else | |
1379 | { | |
1380 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); | |
1381 | ||
1382 | if (info->shared) | |
1383 | { | |
1384 | asection *srelgot; | |
1385 | Elf_Internal_Rel outrel; | |
1386 | ||
1387 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
1388 | BFD_ASSERT (srelgot != NULL); | |
1389 | ||
1390 | outrel.r_offset = (sgot->output_section->vma | |
1391 | + sgot->output_offset | |
1392 | + off); | |
1393 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1394 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1395 | (((Elf32_External_Rel *) | |
1396 | srelgot->contents) | |
1397 | + srelgot->reloc_count)); | |
1398 | ++srelgot->reloc_count; | |
1399 | } | |
1400 | ||
1401 | local_got_offsets[r_symndx] |= 1; | |
1402 | } | |
1403 | ||
1404 | relocation = sgot->output_offset + off; | |
1405 | } | |
1406 | ||
1407 | break; | |
1408 | ||
1409 | case R_386_GOTOFF: | |
1410 | /* Relocation is relative to the start of the global offset | |
1411 | table. */ | |
1412 | ||
1413 | if (sgot == NULL) | |
1414 | { | |
1415 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1416 | BFD_ASSERT (sgot != NULL); | |
1417 | } | |
1418 | ||
1419 | /* Note that sgot->output_offset is not involved in this | |
1420 | calculation. We always want the start of .got. If we | |
1421 | defined _GLOBAL_OFFSET_TABLE in a different way, as is | |
1422 | permitted by the ABI, we might have to change this | |
1423 | calculation. */ | |
1424 | relocation -= sgot->output_section->vma; | |
1425 | ||
1426 | break; | |
1427 | ||
1428 | case R_386_GOTPC: | |
1429 | /* Use global offset table as symbol value. */ | |
1430 | ||
1431 | if (sgot == NULL) | |
1432 | { | |
1433 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1434 | BFD_ASSERT (sgot != NULL); | |
1435 | } | |
1436 | ||
1437 | relocation = sgot->output_section->vma; | |
1438 | ||
1439 | break; | |
1440 | ||
1441 | case R_386_PLT32: | |
1442 | /* Relocation is to the entry for this symbol in the | |
1443 | procedure linkage table. */ | |
1444 | ||
1445 | /* Resolve a PLT32 reloc again a local symbol directly, | |
1446 | without using the procedure linkage table. */ | |
1447 | if (h == NULL) | |
1448 | break; | |
1449 | ||
1450 | if (h->plt.offset == (bfd_vma) -1) | |
1451 | { | |
1452 | /* We didn't make a PLT entry for this symbol. This | |
1453 | happens when statically linking PIC code, or when | |
1454 | using -Bsymbolic. */ | |
1455 | break; | |
1456 | } | |
1457 | ||
1458 | if (splt == NULL) | |
1459 | { | |
1460 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1461 | BFD_ASSERT (splt != NULL); | |
1462 | } | |
1463 | ||
1464 | relocation = (splt->output_section->vma | |
1465 | + splt->output_offset | |
1466 | + h->plt.offset); | |
1467 | ||
1468 | break; | |
1469 | ||
1470 | case R_386_32: | |
1471 | case R_386_PC32: | |
1472 | if (info->shared | |
1473 | && (input_section->flags & SEC_ALLOC) != 0 | |
1474 | && (r_type != R_386_PC32 | |
1475 | || (h != NULL | |
1476 | && h->dynindx != -1 | |
1477 | && (! info->symbolic | |
1478 | || (h->elf_link_hash_flags | |
1479 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1480 | { | |
1481 | Elf_Internal_Rel outrel; | |
1482 | boolean skip, relocate; | |
1483 | ||
1484 | /* When generating a shared object, these relocations | |
1485 | are copied into the output file to be resolved at run | |
1486 | time. */ | |
1487 | ||
1488 | if (sreloc == NULL) | |
1489 | { | |
1490 | const char *name; | |
1491 | ||
1492 | name = (bfd_elf_string_from_elf_section | |
1493 | (input_bfd, | |
1494 | elf_elfheader (input_bfd)->e_shstrndx, | |
1495 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1496 | if (name == NULL) | |
1497 | return false; | |
1498 | ||
1499 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
1500 | && strcmp (bfd_get_section_name (input_bfd, | |
1501 | input_section), | |
1502 | name + 4) == 0); | |
1503 | ||
1504 | sreloc = bfd_get_section_by_name (dynobj, name); | |
1505 | BFD_ASSERT (sreloc != NULL); | |
1506 | } | |
1507 | ||
1508 | skip = false; | |
1509 | ||
1510 | if (elf_section_data (input_section)->stab_info == NULL) | |
1511 | outrel.r_offset = rel->r_offset; | |
1512 | else | |
1513 | { | |
1514 | bfd_vma off; | |
1515 | ||
1516 | off = (_bfd_stab_section_offset | |
1517 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1518 | input_section, | |
1519 | &elf_section_data (input_section)->stab_info, | |
1520 | rel->r_offset)); | |
1521 | if (off == (bfd_vma) -1) | |
1522 | skip = true; | |
1523 | outrel.r_offset = off; | |
1524 | } | |
1525 | ||
1526 | outrel.r_offset += (input_section->output_section->vma | |
1527 | + input_section->output_offset); | |
1528 | ||
1529 | if (skip) | |
1530 | { | |
1531 | memset (&outrel, 0, sizeof outrel); | |
1532 | relocate = false; | |
1533 | } | |
1534 | else if (r_type == R_386_PC32) | |
1535 | { | |
1536 | BFD_ASSERT (h != NULL && h->dynindx != -1); | |
1537 | relocate = false; | |
1538 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32); | |
1539 | } | |
1540 | else | |
1541 | { | |
1542 | /* h->dynindx may be -1 if this symbol was marked to | |
1543 | become local. */ | |
1544 | if (h == NULL | |
1545 | || ((info->symbolic || h->dynindx == -1) | |
1546 | && (h->elf_link_hash_flags | |
1547 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1548 | { | |
1549 | relocate = true; | |
1550 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1551 | } | |
1552 | else | |
1553 | { | |
1554 | BFD_ASSERT (h->dynindx != -1); | |
1555 | relocate = false; | |
1556 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_32); | |
1557 | } | |
1558 | } | |
1559 | ||
1560 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1561 | (((Elf32_External_Rel *) | |
1562 | sreloc->contents) | |
1563 | + sreloc->reloc_count)); | |
1564 | ++sreloc->reloc_count; | |
1565 | ||
1566 | /* If this reloc is against an external symbol, we do | |
1567 | not want to fiddle with the addend. Otherwise, we | |
1568 | need to include the symbol value so that it becomes | |
1569 | an addend for the dynamic reloc. */ | |
1570 | if (! relocate) | |
1571 | continue; | |
1572 | } | |
1573 | ||
1574 | break; | |
1575 | ||
1576 | default: | |
1577 | break; | |
1578 | } | |
1579 | ||
1580 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1581 | contents, rel->r_offset, | |
1582 | relocation, (bfd_vma) 0); | |
1583 | ||
1584 | if (r != bfd_reloc_ok) | |
1585 | { | |
1586 | switch (r) | |
1587 | { | |
1588 | default: | |
1589 | case bfd_reloc_outofrange: | |
1590 | abort (); | |
1591 | case bfd_reloc_overflow: | |
1592 | { | |
1593 | const char *name; | |
1594 | ||
1595 | if (h != NULL) | |
1596 | name = h->root.root.string; | |
1597 | else | |
1598 | { | |
1599 | name = bfd_elf_string_from_elf_section (input_bfd, | |
1600 | symtab_hdr->sh_link, | |
1601 | sym->st_name); | |
1602 | if (name == NULL) | |
1603 | return false; | |
1604 | if (*name == '\0') | |
1605 | name = bfd_section_name (input_bfd, sec); | |
1606 | } | |
1607 | if (! ((*info->callbacks->reloc_overflow) | |
1608 | (info, name, howto->name, (bfd_vma) 0, | |
1609 | input_bfd, input_section, rel->r_offset))) | |
1610 | return false; | |
1611 | } | |
1612 | break; | |
1613 | } | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | return true; | |
1618 | } | |
1619 | ||
1620 | /* Finish up dynamic symbol handling. We set the contents of various | |
1621 | dynamic sections here. */ | |
1622 | ||
1623 | static boolean | |
1624 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1625 | bfd *output_bfd; | |
1626 | struct bfd_link_info *info; | |
1627 | struct elf_link_hash_entry *h; | |
1628 | Elf_Internal_Sym *sym; | |
1629 | { | |
1630 | bfd *dynobj; | |
1631 | ||
1632 | dynobj = elf_hash_table (info)->dynobj; | |
1633 | ||
1634 | if (h->plt.offset != (bfd_vma) -1) | |
1635 | { | |
1636 | asection *splt; | |
1637 | asection *sgot; | |
1638 | asection *srel; | |
1639 | bfd_vma plt_index; | |
1640 | bfd_vma got_offset; | |
1641 | Elf_Internal_Rel rel; | |
1642 | ||
1643 | /* This symbol has an entry in the procedure linkage table. Set | |
1644 | it up. */ | |
1645 | ||
1646 | BFD_ASSERT (h->dynindx != -1); | |
1647 | ||
1648 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1649 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1650 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
1651 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
1652 | ||
1653 | /* Get the index in the procedure linkage table which | |
1654 | corresponds to this symbol. This is the index of this symbol | |
1655 | in all the symbols for which we are making plt entries. The | |
1656 | first entry in the procedure linkage table is reserved. */ | |
1657 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
1658 | ||
1659 | /* Get the offset into the .got table of the entry that | |
1660 | corresponds to this function. Each .got entry is 4 bytes. | |
1661 | The first three are reserved. */ | |
1662 | got_offset = (plt_index + 3) * 4; | |
1663 | ||
1664 | /* Fill in the entry in the procedure linkage table. */ | |
1665 | if (! info->shared) | |
1666 | { | |
1667 | memcpy (splt->contents + h->plt.offset, elf_i386_plt_entry, | |
1668 | PLT_ENTRY_SIZE); | |
1669 | bfd_put_32 (output_bfd, | |
1670 | (sgot->output_section->vma | |
1671 | + sgot->output_offset | |
1672 | + got_offset), | |
1673 | splt->contents + h->plt.offset + 2); | |
1674 | } | |
1675 | else | |
1676 | { | |
1677 | memcpy (splt->contents + h->plt.offset, elf_i386_pic_plt_entry, | |
1678 | PLT_ENTRY_SIZE); | |
1679 | bfd_put_32 (output_bfd, got_offset, | |
1680 | splt->contents + h->plt.offset + 2); | |
1681 | } | |
1682 | ||
1683 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), | |
1684 | splt->contents + h->plt.offset + 7); | |
1685 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), | |
1686 | splt->contents + h->plt.offset + 12); | |
1687 | ||
1688 | /* Fill in the entry in the global offset table. */ | |
1689 | bfd_put_32 (output_bfd, | |
1690 | (splt->output_section->vma | |
1691 | + splt->output_offset | |
1692 | + h->plt.offset | |
1693 | + 6), | |
1694 | sgot->contents + got_offset); | |
1695 | ||
1696 | /* Fill in the entry in the .rel.plt section. */ | |
1697 | rel.r_offset = (sgot->output_section->vma | |
1698 | + sgot->output_offset | |
1699 | + got_offset); | |
1700 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); | |
1701 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1702 | ((Elf32_External_Rel *) srel->contents | |
1703 | + plt_index)); | |
1704 | ||
1705 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1706 | { | |
1707 | /* Mark the symbol as undefined, rather than as defined in | |
1708 | the .plt section. Leave the value alone. */ | |
1709 | sym->st_shndx = SHN_UNDEF; | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | if (h->got.offset != (bfd_vma) -1) | |
1714 | { | |
1715 | asection *sgot; | |
1716 | asection *srel; | |
1717 | Elf_Internal_Rel rel; | |
1718 | ||
1719 | /* This symbol has an entry in the global offset table. Set it | |
1720 | up. */ | |
1721 | ||
1722 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1723 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
1724 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
1725 | ||
1726 | rel.r_offset = (sgot->output_section->vma | |
1727 | + sgot->output_offset | |
1728 | + (h->got.offset &~ 1)); | |
1729 | ||
1730 | /* If this is a -Bsymbolic link, and the symbol is defined | |
1731 | locally, we just want to emit a RELATIVE reloc. Likewise if | |
1732 | the symbol was forced to be local because of a version file. | |
1733 | The entry in the global offset table will already have been | |
1734 | initialized in the relocate_section function. */ | |
1735 | if (info->shared | |
1736 | && (info->symbolic || h->dynindx == -1) | |
1737 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
1738 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1739 | else | |
1740 | { | |
1741 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
1742 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); | |
1743 | } | |
1744 | ||
1745 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1746 | ((Elf32_External_Rel *) srel->contents | |
1747 | + srel->reloc_count)); | |
1748 | ++srel->reloc_count; | |
1749 | } | |
1750 | ||
1751 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
1752 | { | |
1753 | asection *s; | |
1754 | Elf_Internal_Rel rel; | |
1755 | ||
1756 | /* This symbol needs a copy reloc. Set it up. */ | |
1757 | ||
1758 | BFD_ASSERT (h->dynindx != -1 | |
1759 | && (h->root.type == bfd_link_hash_defined | |
1760 | || h->root.type == bfd_link_hash_defweak)); | |
1761 | ||
1762 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
1763 | ".rel.bss"); | |
1764 | BFD_ASSERT (s != NULL); | |
1765 | ||
1766 | rel.r_offset = (h->root.u.def.value | |
1767 | + h->root.u.def.section->output_section->vma | |
1768 | + h->root.u.def.section->output_offset); | |
1769 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); | |
1770 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1771 | ((Elf32_External_Rel *) s->contents | |
1772 | + s->reloc_count)); | |
1773 | ++s->reloc_count; | |
1774 | } | |
1775 | ||
1776 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
1777 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
1778 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
1779 | sym->st_shndx = SHN_ABS; | |
1780 | ||
1781 | return true; | |
1782 | } | |
1783 | ||
1784 | /* Finish up the dynamic sections. */ | |
1785 | ||
1786 | static boolean | |
1787 | elf_i386_finish_dynamic_sections (output_bfd, info) | |
1788 | bfd *output_bfd; | |
1789 | struct bfd_link_info *info; | |
1790 | { | |
1791 | bfd *dynobj; | |
1792 | asection *sgot; | |
1793 | asection *sdyn; | |
1794 | ||
1795 | dynobj = elf_hash_table (info)->dynobj; | |
1796 | ||
1797 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1798 | BFD_ASSERT (sgot != NULL); | |
1799 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
1800 | ||
1801 | if (elf_hash_table (info)->dynamic_sections_created) | |
1802 | { | |
1803 | asection *splt; | |
1804 | Elf32_External_Dyn *dyncon, *dynconend; | |
1805 | ||
1806 | BFD_ASSERT (sdyn != NULL); | |
1807 | ||
1808 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
1809 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
1810 | for (; dyncon < dynconend; dyncon++) | |
1811 | { | |
1812 | Elf_Internal_Dyn dyn; | |
1813 | const char *name; | |
1814 | asection *s; | |
1815 | ||
1816 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
1817 | ||
1818 | switch (dyn.d_tag) | |
1819 | { | |
1820 | default: | |
1821 | break; | |
1822 | ||
1823 | case DT_PLTGOT: | |
1824 | name = ".got"; | |
1825 | goto get_vma; | |
1826 | case DT_JMPREL: | |
1827 | name = ".rel.plt"; | |
1828 | get_vma: | |
1829 | s = bfd_get_section_by_name (output_bfd, name); | |
1830 | BFD_ASSERT (s != NULL); | |
1831 | dyn.d_un.d_ptr = s->vma; | |
1832 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1833 | break; | |
1834 | ||
1835 | case DT_PLTRELSZ: | |
1836 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
1837 | BFD_ASSERT (s != NULL); | |
1838 | if (s->_cooked_size != 0) | |
1839 | dyn.d_un.d_val = s->_cooked_size; | |
1840 | else | |
1841 | dyn.d_un.d_val = s->_raw_size; | |
1842 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1843 | break; | |
1844 | ||
1845 | case DT_RELSZ: | |
1846 | /* My reading of the SVR4 ABI indicates that the | |
1847 | procedure linkage table relocs (DT_JMPREL) should be | |
1848 | included in the overall relocs (DT_REL). This is | |
1849 | what Solaris does. However, UnixWare can not handle | |
1850 | that case. Therefore, we override the DT_RELSZ entry | |
1851 | here to make it not include the JMPREL relocs. Since | |
1852 | the linker script arranges for .rel.plt to follow all | |
1853 | other relocation sections, we don't have to worry | |
1854 | about changing the DT_REL entry. */ | |
1855 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
1856 | if (s != NULL) | |
1857 | { | |
1858 | if (s->_cooked_size != 0) | |
1859 | dyn.d_un.d_val -= s->_cooked_size; | |
1860 | else | |
1861 | dyn.d_un.d_val -= s->_raw_size; | |
1862 | } | |
1863 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1864 | break; | |
1865 | } | |
1866 | } | |
1867 | ||
1868 | /* Fill in the first entry in the procedure linkage table. */ | |
1869 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1870 | if (splt && splt->_raw_size > 0) | |
1871 | { | |
1872 | if (info->shared) | |
1873 | memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); | |
1874 | else | |
1875 | { | |
1876 | memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE); | |
1877 | bfd_put_32 (output_bfd, | |
1878 | sgot->output_section->vma + sgot->output_offset + 4, | |
1879 | splt->contents + 2); | |
1880 | bfd_put_32 (output_bfd, | |
1881 | sgot->output_section->vma + sgot->output_offset + 8, | |
1882 | splt->contents + 8); | |
1883 | } | |
1884 | ||
1885 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
1886 | really seem like the right value. */ | |
1887 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
1888 | } | |
1889 | } | |
1890 | ||
1891 | /* Fill in the first three entries in the global offset table. */ | |
1892 | if (sgot->_raw_size > 0) | |
1893 | { | |
1894 | if (sdyn == NULL) | |
1895 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
1896 | else | |
1897 | bfd_put_32 (output_bfd, | |
1898 | sdyn->output_section->vma + sdyn->output_offset, | |
1899 | sgot->contents); | |
1900 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
1901 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
1902 | } | |
1903 | ||
1904 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
1905 | ||
1906 | return true; | |
1907 | } | |
1908 | ||
1909 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec | |
1910 | #define TARGET_LITTLE_NAME "elf32-i386" | |
1911 | #define ELF_ARCH bfd_arch_i386 | |
1912 | #define ELF_MACHINE_CODE EM_386 | |
1913 | #define ELF_MAXPAGESIZE 0x1000 | |
1914 | #define elf_info_to_howto elf_i386_info_to_howto | |
1915 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel | |
1916 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup | |
1917 | #define bfd_elf32_bfd_is_local_label_name \ | |
1918 | elf_i386_is_local_label_name | |
1919 | #define elf_backend_create_dynamic_sections \ | |
1920 | _bfd_elf_create_dynamic_sections | |
1921 | #define bfd_elf32_bfd_link_hash_table_create \ | |
1922 | elf_i386_link_hash_table_create | |
1923 | #define elf_backend_check_relocs elf_i386_check_relocs | |
1924 | #define elf_backend_adjust_dynamic_symbol \ | |
1925 | elf_i386_adjust_dynamic_symbol | |
1926 | #define elf_backend_size_dynamic_sections \ | |
1927 | elf_i386_size_dynamic_sections | |
1928 | #define elf_backend_relocate_section elf_i386_relocate_section | |
1929 | #define elf_backend_finish_dynamic_symbol \ | |
1930 | elf_i386_finish_dynamic_symbol | |
1931 | #define elf_backend_finish_dynamic_sections \ | |
1932 | elf_i386_finish_dynamic_sections | |
1933 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook | |
1934 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook | |
1935 | ||
1936 | #define elf_backend_can_gc_sections 1 | |
1937 | #define elf_backend_want_got_plt 1 | |
1938 | #define elf_backend_plt_readonly 1 | |
1939 | #define elf_backend_want_plt_sym 0 | |
1940 | #define elf_backend_got_header_size 12 | |
1941 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
1942 | ||
1943 | #include "elf32-target.h" |