Commit | Line | Data |
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252b5132 | 1 | /* BFD back-end for linux flavored i386 a.out binaries. |
9553c638 AM |
2 | Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2001, 2002, 2003, |
3 | 2004 Free Software Foundation, Inc. | |
252b5132 RH |
4 | |
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
3e110533 | 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
252b5132 RH |
20 | |
21 | #define TARGET_PAGE_SIZE 4096 | |
22 | #define ZMAGIC_DISK_BLOCK_SIZE 1024 | |
23 | #define SEGMENT_SIZE TARGET_PAGE_SIZE | |
24 | #define TEXT_START_ADDR 0x0 | |
25 | #define N_SHARED_LIB(x) 0 | |
252b5132 RH |
26 | |
27 | #define MACHTYPE_OK(mtype) ((mtype) == M_386 || (mtype) == M_UNKNOWN) | |
28 | ||
29 | #include "bfd.h" | |
30 | #include "sysdep.h" | |
31 | #include "libbfd.h" | |
32 | #include "aout/aout64.h" | |
33 | #include "aout/stab_gnu.h" | |
34 | #include "aout/ar.h" | |
35 | #include "libaout.h" /* BFD a.out internal data structures */ | |
36 | ||
37 | #define DEFAULT_ARCH bfd_arch_i386 | |
e43d48cc AM |
38 | |
39 | /* Do not "beautify" the CONCAT* macro args. Traditional C will not | |
40 | remove whitespace added here, and thus will fail to concatenate | |
41 | the tokens. */ | |
42 | #define MY(OP) CONCAT2 (i386linux_,OP) | |
252b5132 RH |
43 | #define TARGETNAME "a.out-i386-linux" |
44 | ||
45 | extern const bfd_target MY(vec); | |
46 | ||
47 | /* We always generate QMAGIC files in preference to ZMAGIC files. It | |
48 | would be possible to make this a linker option, if that ever | |
49 | becomes important. */ | |
50 | ||
51 | static void MY_final_link_callback | |
52 | PARAMS ((bfd *, file_ptr *, file_ptr *, file_ptr *)); | |
b34976b6 | 53 | static bfd_boolean i386linux_bfd_final_link |
252b5132 | 54 | PARAMS ((bfd *, struct bfd_link_info *)); |
b34976b6 | 55 | static bfd_boolean i386linux_write_object_contents PARAMS ((bfd *)); |
252b5132 | 56 | |
b34976b6 | 57 | static bfd_boolean |
252b5132 RH |
58 | i386linux_bfd_final_link (abfd, info) |
59 | bfd *abfd; | |
60 | struct bfd_link_info *info; | |
61 | { | |
62 | obj_aout_subformat (abfd) = q_magic_format; | |
63 | return NAME(aout,final_link) (abfd, info, MY_final_link_callback); | |
64 | } | |
65 | ||
66 | #define MY_bfd_final_link i386linux_bfd_final_link | |
67 | ||
68 | /* Set the machine type correctly. */ | |
69 | ||
b34976b6 | 70 | static bfd_boolean |
252b5132 RH |
71 | i386linux_write_object_contents (abfd) |
72 | bfd *abfd; | |
73 | { | |
74 | struct external_exec exec_bytes; | |
75 | struct internal_exec *execp = exec_hdr (abfd); | |
76 | ||
77 | N_SET_MACHTYPE (*execp, M_386); | |
78 | ||
79 | obj_reloc_entry_size (abfd) = RELOC_STD_SIZE; | |
80 | ||
81 | WRITE_HEADERS(abfd, execp); | |
82 | ||
b34976b6 | 83 | return TRUE; |
252b5132 RH |
84 | } |
85 | ||
86 | #define MY_write_object_contents i386linux_write_object_contents | |
87 | \f | |
88 | /* Code to link against Linux a.out shared libraries. */ | |
89 | ||
90 | /* See if a symbol name is a reference to the global offset table. */ | |
91 | ||
92 | #ifndef GOT_REF_PREFIX | |
93 | #define GOT_REF_PREFIX "__GOT_" | |
94 | #endif | |
95 | ||
96 | #define IS_GOT_SYM(name) \ | |
97 | (strncmp (name, GOT_REF_PREFIX, sizeof GOT_REF_PREFIX - 1) == 0) | |
98 | ||
99 | /* See if a symbol name is a reference to the procedure linkage table. */ | |
100 | ||
101 | #ifndef PLT_REF_PREFIX | |
102 | #define PLT_REF_PREFIX "__PLT_" | |
103 | #endif | |
104 | ||
105 | #define IS_PLT_SYM(name) \ | |
106 | (strncmp (name, PLT_REF_PREFIX, sizeof PLT_REF_PREFIX - 1) == 0) | |
107 | ||
108 | /* This string is used to generate specialized error messages. */ | |
109 | ||
110 | #ifndef NEEDS_SHRLIB | |
111 | #define NEEDS_SHRLIB "__NEEDS_SHRLIB_" | |
112 | #endif | |
113 | ||
114 | /* This special symbol is a set vector that contains a list of | |
7dee875e | 115 | pointers to fixup tables. It will be present in any dynamically |
252b5132 RH |
116 | linked file. The linker generated fixup table should also be added |
117 | to the list, and it should always appear in the second slot (the | |
118 | first one is a dummy with a magic number that is defined in | |
119 | crt0.o). */ | |
120 | ||
121 | #ifndef SHARABLE_CONFLICTS | |
122 | #define SHARABLE_CONFLICTS "__SHARABLE_CONFLICTS__" | |
123 | #endif | |
124 | ||
125 | /* We keep a list of fixups. The terminology is a bit strange, but | |
126 | each fixup contains two 32 bit numbers. A regular fixup contains | |
127 | an address and a pointer, and at runtime we should store the | |
128 | address at the location pointed to by the pointer. A builtin fixup | |
129 | contains two pointers, and we should read the address using one | |
130 | pointer and store it at the location pointed to by the other | |
131 | pointer. Builtin fixups come into play when we have duplicate | |
132 | __GOT__ symbols for the same variable. The builtin fixup will copy | |
133 | the GOT pointer from one over into the other. */ | |
134 | ||
135 | struct fixup | |
136 | { | |
137 | struct fixup *next; | |
138 | struct linux_link_hash_entry *h; | |
139 | bfd_vma value; | |
140 | ||
141 | /* Nonzero if this is a jump instruction that needs to be fixed, | |
142 | zero if this is just a pointer */ | |
143 | char jump; | |
144 | ||
145 | char builtin; | |
146 | }; | |
147 | ||
148 | /* We don't need a special hash table entry structure, but we do need | |
149 | to keep some information between linker passes, so we use a special | |
150 | hash table. */ | |
151 | ||
152 | struct linux_link_hash_entry | |
153 | { | |
154 | struct aout_link_hash_entry root; | |
155 | }; | |
156 | ||
157 | struct linux_link_hash_table | |
158 | { | |
159 | struct aout_link_hash_table root; | |
160 | ||
161 | /* First dynamic object found in link. */ | |
162 | bfd *dynobj; | |
163 | ||
164 | /* Number of fixups. */ | |
165 | size_t fixup_count; | |
166 | ||
167 | /* Number of builtin fixups. */ | |
168 | size_t local_builtins; | |
169 | ||
170 | /* List of fixups. */ | |
171 | struct fixup *fixup_list; | |
172 | }; | |
173 | ||
174 | static struct bfd_hash_entry *linux_link_hash_newfunc | |
175 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
176 | static struct bfd_link_hash_table *linux_link_hash_table_create | |
177 | PARAMS ((bfd *)); | |
178 | static struct fixup *new_fixup | |
179 | PARAMS ((struct bfd_link_info *, struct linux_link_hash_entry *, | |
180 | bfd_vma, int)); | |
b34976b6 | 181 | static bfd_boolean linux_link_create_dynamic_sections |
252b5132 | 182 | PARAMS ((bfd *, struct bfd_link_info *)); |
b34976b6 | 183 | static bfd_boolean linux_add_one_symbol |
252b5132 | 184 | PARAMS ((struct bfd_link_info *, bfd *, const char *, flagword, asection *, |
b34976b6 | 185 | bfd_vma, const char *, bfd_boolean, bfd_boolean, |
252b5132 | 186 | struct bfd_link_hash_entry **)); |
b34976b6 | 187 | static bfd_boolean linux_tally_symbols |
252b5132 | 188 | PARAMS ((struct linux_link_hash_entry *, PTR)); |
b34976b6 | 189 | static bfd_boolean linux_finish_dynamic_link |
252b5132 RH |
190 | PARAMS ((bfd *, struct bfd_link_info *)); |
191 | ||
192 | /* Routine to create an entry in an Linux link hash table. */ | |
193 | ||
194 | static struct bfd_hash_entry * | |
195 | linux_link_hash_newfunc (entry, table, string) | |
196 | struct bfd_hash_entry *entry; | |
197 | struct bfd_hash_table *table; | |
198 | const char *string; | |
199 | { | |
200 | struct linux_link_hash_entry *ret = (struct linux_link_hash_entry *) entry; | |
201 | ||
202 | /* Allocate the structure if it has not already been allocated by a | |
203 | subclass. */ | |
204 | if (ret == (struct linux_link_hash_entry *) NULL) | |
205 | ret = ((struct linux_link_hash_entry *) | |
206 | bfd_hash_allocate (table, sizeof (struct linux_link_hash_entry))); | |
207 | if (ret == NULL) | |
208 | return (struct bfd_hash_entry *) ret; | |
209 | ||
210 | /* Call the allocation method of the superclass. */ | |
211 | ret = ((struct linux_link_hash_entry *) | |
212 | NAME(aout,link_hash_newfunc) ((struct bfd_hash_entry *) ret, | |
213 | table, string)); | |
214 | if (ret != NULL) | |
215 | { | |
216 | /* Set local fields; there aren't any. */ | |
217 | } | |
218 | ||
219 | return (struct bfd_hash_entry *) ret; | |
220 | } | |
221 | ||
222 | /* Create a Linux link hash table. */ | |
223 | ||
224 | static struct bfd_link_hash_table * | |
225 | linux_link_hash_table_create (abfd) | |
226 | bfd *abfd; | |
227 | { | |
228 | struct linux_link_hash_table *ret; | |
dc810e39 | 229 | bfd_size_type amt = sizeof (struct linux_link_hash_table); |
252b5132 | 230 | |
dc810e39 | 231 | ret = (struct linux_link_hash_table *) bfd_alloc (abfd, amt); |
252b5132 RH |
232 | if (ret == (struct linux_link_hash_table *) NULL) |
233 | return (struct bfd_link_hash_table *) NULL; | |
234 | if (! NAME(aout,link_hash_table_init) (&ret->root, abfd, | |
235 | linux_link_hash_newfunc)) | |
236 | { | |
237 | free (ret); | |
238 | return (struct bfd_link_hash_table *) NULL; | |
239 | } | |
240 | ||
241 | ret->dynobj = NULL; | |
242 | ret->fixup_count = 0; | |
243 | ret->local_builtins = 0; | |
244 | ret->fixup_list = NULL; | |
245 | ||
246 | return &ret->root.root; | |
247 | } | |
248 | ||
249 | /* Look up an entry in a Linux link hash table. */ | |
250 | ||
251 | #define linux_link_hash_lookup(table, string, create, copy, follow) \ | |
252 | ((struct linux_link_hash_entry *) \ | |
253 | aout_link_hash_lookup (&(table)->root, (string), (create), (copy),\ | |
254 | (follow))) | |
255 | ||
256 | /* Traverse a Linux link hash table. */ | |
257 | ||
258 | #define linux_link_hash_traverse(table, func, info) \ | |
259 | (aout_link_hash_traverse \ | |
260 | (&(table)->root, \ | |
b34976b6 | 261 | (bfd_boolean (*) PARAMS ((struct aout_link_hash_entry *, PTR))) (func), \ |
252b5132 RH |
262 | (info))) |
263 | ||
264 | /* Get the Linux link hash table from the info structure. This is | |
265 | just a cast. */ | |
266 | ||
267 | #define linux_hash_table(p) ((struct linux_link_hash_table *) ((p)->hash)) | |
268 | ||
269 | /* Store the information for a new fixup. */ | |
270 | ||
271 | static struct fixup * | |
272 | new_fixup (info, h, value, builtin) | |
273 | struct bfd_link_info *info; | |
274 | struct linux_link_hash_entry *h; | |
275 | bfd_vma value; | |
276 | int builtin; | |
277 | { | |
278 | struct fixup *f; | |
279 | ||
280 | f = (struct fixup *) bfd_hash_allocate (&info->hash->table, | |
281 | sizeof (struct fixup)); | |
282 | if (f == NULL) | |
283 | return f; | |
284 | f->next = linux_hash_table (info)->fixup_list; | |
285 | linux_hash_table (info)->fixup_list = f; | |
286 | f->h = h; | |
287 | f->value = value; | |
288 | f->builtin = builtin; | |
289 | f->jump = 0; | |
290 | ++linux_hash_table (info)->fixup_count; | |
291 | return f; | |
292 | } | |
293 | ||
294 | /* We come here once we realize that we are going to link to a shared | |
295 | library. We need to create a special section that contains the | |
296 | fixup table, and we ultimately need to add a pointer to this into | |
297 | the set vector for SHARABLE_CONFLICTS. At this point we do not | |
298 | know the size of the section, but that's OK - we just need to | |
299 | create it for now. */ | |
300 | ||
b34976b6 | 301 | static bfd_boolean |
252b5132 RH |
302 | linux_link_create_dynamic_sections (abfd, info) |
303 | bfd *abfd; | |
7442e600 | 304 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
305 | { |
306 | flagword flags; | |
307 | register asection *s; | |
308 | ||
309 | /* Note that we set the SEC_IN_MEMORY flag. */ | |
310 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; | |
311 | ||
312 | /* We choose to use the name ".linux-dynamic" for the fixup table. | |
313 | Why not? */ | |
314 | s = bfd_make_section (abfd, ".linux-dynamic"); | |
315 | if (s == NULL | |
316 | || ! bfd_set_section_flags (abfd, s, flags) | |
317 | || ! bfd_set_section_alignment (abfd, s, 2)) | |
b34976b6 | 318 | return FALSE; |
eea6121a | 319 | s->size = 0; |
252b5132 RH |
320 | s->contents = 0; |
321 | ||
b34976b6 | 322 | return TRUE; |
252b5132 RH |
323 | } |
324 | ||
325 | /* Function to add a single symbol to the linker hash table. This is | |
326 | a wrapper around _bfd_generic_link_add_one_symbol which handles the | |
327 | tweaking needed for dynamic linking support. */ | |
328 | ||
b34976b6 | 329 | static bfd_boolean |
252b5132 RH |
330 | linux_add_one_symbol (info, abfd, name, flags, section, value, string, |
331 | copy, collect, hashp) | |
332 | struct bfd_link_info *info; | |
333 | bfd *abfd; | |
334 | const char *name; | |
335 | flagword flags; | |
336 | asection *section; | |
337 | bfd_vma value; | |
338 | const char *string; | |
b34976b6 AM |
339 | bfd_boolean copy; |
340 | bfd_boolean collect; | |
252b5132 RH |
341 | struct bfd_link_hash_entry **hashp; |
342 | { | |
343 | struct linux_link_hash_entry *h; | |
b34976b6 | 344 | bfd_boolean insert; |
252b5132 RH |
345 | |
346 | /* Look up and see if we already have this symbol in the hash table. | |
347 | If we do, and the defining entry is from a shared library, we | |
348 | need to create the dynamic sections. | |
349 | ||
350 | FIXME: What if abfd->xvec != info->hash->creator? We may want to | |
351 | be able to link Linux a.out and ELF objects together, but serious | |
352 | confusion is possible. */ | |
353 | ||
b34976b6 | 354 | insert = FALSE; |
252b5132 | 355 | |
1049f94e | 356 | if (! info->relocatable |
252b5132 RH |
357 | && linux_hash_table (info)->dynobj == NULL |
358 | && strcmp (name, SHARABLE_CONFLICTS) == 0 | |
359 | && (flags & BSF_CONSTRUCTOR) != 0 | |
360 | && abfd->xvec == info->hash->creator) | |
361 | { | |
362 | if (! linux_link_create_dynamic_sections (abfd, info)) | |
b34976b6 | 363 | return FALSE; |
252b5132 | 364 | linux_hash_table (info)->dynobj = abfd; |
b34976b6 | 365 | insert = TRUE; |
252b5132 RH |
366 | } |
367 | ||
368 | if (bfd_is_abs_section (section) | |
369 | && abfd->xvec == info->hash->creator) | |
370 | { | |
b34976b6 AM |
371 | h = linux_link_hash_lookup (linux_hash_table (info), name, FALSE, |
372 | FALSE, FALSE); | |
252b5132 RH |
373 | if (h != NULL |
374 | && (h->root.root.type == bfd_link_hash_defined | |
375 | || h->root.root.type == bfd_link_hash_defweak)) | |
376 | { | |
377 | struct fixup *f; | |
378 | ||
379 | if (hashp != NULL) | |
380 | *hashp = (struct bfd_link_hash_entry *) h; | |
381 | ||
382 | f = new_fixup (info, h, value, ! IS_PLT_SYM (name)); | |
383 | if (f == NULL) | |
b34976b6 | 384 | return FALSE; |
252b5132 RH |
385 | f->jump = IS_PLT_SYM (name); |
386 | ||
b34976b6 | 387 | return TRUE; |
252b5132 RH |
388 | } |
389 | } | |
390 | ||
391 | /* Do the usual procedure for adding a symbol. */ | |
392 | if (! _bfd_generic_link_add_one_symbol (info, abfd, name, flags, section, | |
393 | value, string, copy, collect, | |
394 | hashp)) | |
b34976b6 | 395 | return FALSE; |
252b5132 RH |
396 | |
397 | /* Insert a pointer to our table in the set vector. The dynamic | |
398 | linker requires this information */ | |
399 | if (insert) | |
400 | { | |
401 | asection *s; | |
402 | ||
403 | /* Here we do our special thing to add the pointer to the | |
404 | dynamic section in the SHARABLE_CONFLICTS set vector. */ | |
405 | s = bfd_get_section_by_name (linux_hash_table (info)->dynobj, | |
406 | ".linux-dynamic"); | |
407 | BFD_ASSERT (s != NULL); | |
408 | ||
409 | if (! (_bfd_generic_link_add_one_symbol | |
410 | (info, linux_hash_table (info)->dynobj, SHARABLE_CONFLICTS, | |
dc810e39 | 411 | BSF_GLOBAL | BSF_CONSTRUCTOR, s, (bfd_vma) 0, NULL, |
b34976b6 AM |
412 | FALSE, FALSE, NULL))) |
413 | return FALSE; | |
252b5132 RH |
414 | } |
415 | ||
b34976b6 | 416 | return TRUE; |
252b5132 RH |
417 | } |
418 | ||
419 | /* We will crawl the hash table and come here for every global symbol. | |
420 | We will examine each entry and see if there are indications that we | |
421 | need to add a fixup. There are two possible cases - one is where | |
422 | you have duplicate definitions of PLT or GOT symbols - these will | |
423 | have already been caught and added as "builtin" fixups. If we find | |
424 | that the corresponding non PLT/GOT symbol is also present, we | |
425 | convert it to a regular fixup instead. | |
426 | ||
427 | This function is called via linux_link_hash_traverse. */ | |
428 | ||
b34976b6 | 429 | static bfd_boolean |
252b5132 RH |
430 | linux_tally_symbols (h, data) |
431 | struct linux_link_hash_entry *h; | |
432 | PTR data; | |
433 | { | |
434 | struct bfd_link_info *info = (struct bfd_link_info *) data; | |
435 | struct fixup *f, *f1; | |
436 | int is_plt; | |
437 | struct linux_link_hash_entry *h1, *h2; | |
b34976b6 | 438 | bfd_boolean exists; |
252b5132 | 439 | |
e92d460e AM |
440 | if (h->root.root.type == bfd_link_hash_warning) |
441 | h = (struct linux_link_hash_entry *) h->root.root.u.i.link; | |
442 | ||
252b5132 RH |
443 | if (h->root.root.type == bfd_link_hash_undefined |
444 | && strncmp (h->root.root.root.string, NEEDS_SHRLIB, | |
445 | sizeof NEEDS_SHRLIB - 1) == 0) | |
446 | { | |
447 | const char *name; | |
448 | char *p; | |
449 | char *alloc = NULL; | |
450 | ||
451 | name = h->root.root.root.string + sizeof NEEDS_SHRLIB - 1; | |
452 | p = strrchr (name, '_'); | |
453 | if (p != NULL) | |
dc810e39 | 454 | alloc = (char *) bfd_malloc ((bfd_size_type) strlen (name) + 1); |
252b5132 RH |
455 | |
456 | if (p == NULL || alloc == NULL) | |
457 | (*_bfd_error_handler) (_("Output file requires shared library `%s'\n"), | |
458 | name); | |
459 | else | |
460 | { | |
461 | strcpy (alloc, name); | |
462 | p = strrchr (alloc, '_'); | |
463 | *p++ = '\0'; | |
464 | (*_bfd_error_handler) | |
465 | (_("Output file requires shared library `%s.so.%s'\n"), | |
466 | alloc, p); | |
467 | free (alloc); | |
468 | } | |
469 | ||
470 | abort (); | |
471 | } | |
472 | ||
473 | /* If this symbol is not a PLT/GOT, we do not even need to look at it */ | |
474 | is_plt = IS_PLT_SYM (h->root.root.root.string); | |
475 | ||
476 | if (is_plt || IS_GOT_SYM (h->root.root.root.string)) | |
477 | { | |
478 | /* Look up this symbol twice. Once just as a regular lookup, | |
479 | and then again following all of the indirect links until we | |
480 | reach a real symbol. */ | |
481 | h1 = linux_link_hash_lookup (linux_hash_table (info), | |
482 | (h->root.root.root.string | |
483 | + sizeof PLT_REF_PREFIX - 1), | |
b34976b6 | 484 | FALSE, FALSE, TRUE); |
252b5132 | 485 | /* h2 does not follow indirect symbols. */ |
dc810e39 | 486 | h2 = linux_link_hash_lookup (linux_hash_table (info), |
252b5132 RH |
487 | (h->root.root.root.string |
488 | + sizeof PLT_REF_PREFIX - 1), | |
b34976b6 | 489 | FALSE, FALSE, FALSE); |
252b5132 RH |
490 | |
491 | /* The real symbol must exist but if it is also an ABS symbol, | |
492 | there is no need to have a fixup. This is because they both | |
493 | came from the same library. If on the other hand, we had to | |
494 | use an indirect symbol to get to the real symbol, we add the | |
495 | fixup anyway, since there are cases where these symbols come | |
496 | from different shared libraries */ | |
497 | if (h1 != NULL | |
498 | && (((h1->root.root.type == bfd_link_hash_defined | |
499 | || h1->root.root.type == bfd_link_hash_defweak) | |
500 | && ! bfd_is_abs_section (h1->root.root.u.def.section)) | |
501 | || h2->root.root.type == bfd_link_hash_indirect)) | |
502 | { | |
503 | /* See if there is a "builtin" fixup already present | |
504 | involving this symbol. If so, convert it to a regular | |
505 | fixup. In the end, this relaxes some of the requirements | |
506 | about the order of performing fixups. */ | |
b34976b6 | 507 | exists = FALSE; |
252b5132 RH |
508 | for (f1 = linux_hash_table (info)->fixup_list; |
509 | f1 != NULL; | |
510 | f1 = f1->next) | |
511 | { | |
512 | if ((f1->h != h && f1->h != h1) | |
513 | || (! f1->builtin && ! f1->jump)) | |
514 | continue; | |
515 | if (f1->h == h1) | |
b34976b6 | 516 | exists = TRUE; |
252b5132 RH |
517 | if (! exists |
518 | && bfd_is_abs_section (h->root.root.u.def.section)) | |
519 | { | |
520 | f = new_fixup (info, h1, f1->h->root.root.u.def.value, 0); | |
521 | f->jump = is_plt; | |
522 | } | |
523 | f1->h = h1; | |
524 | f1->jump = is_plt; | |
525 | f1->builtin = 0; | |
b34976b6 | 526 | exists = TRUE; |
252b5132 RH |
527 | } |
528 | if (! exists | |
529 | && bfd_is_abs_section (h->root.root.u.def.section)) | |
530 | { | |
531 | f = new_fixup (info, h1, h->root.root.u.def.value, 0); | |
532 | if (f == NULL) | |
533 | { | |
534 | /* FIXME: No way to return error. */ | |
535 | abort (); | |
536 | } | |
537 | f->jump = is_plt; | |
538 | } | |
539 | } | |
540 | ||
541 | /* Quick and dirty way of stripping these symbols from the | |
542 | symtab. */ | |
543 | if (bfd_is_abs_section (h->root.root.u.def.section)) | |
b34976b6 | 544 | h->root.written = TRUE; |
252b5132 RH |
545 | } |
546 | ||
b34976b6 | 547 | return TRUE; |
252b5132 RH |
548 | } |
549 | ||
550 | /* This is called to set the size of the .linux-dynamic section is. | |
551 | It is called by the Linux linker emulation before_allocation | |
552 | routine. We have finished reading all of the input files, and now | |
553 | we just scan the hash tables to find out how many additional fixups | |
554 | are required. */ | |
555 | ||
b34976b6 | 556 | bfd_boolean |
252b5132 RH |
557 | bfd_i386linux_size_dynamic_sections (output_bfd, info) |
558 | bfd *output_bfd; | |
559 | struct bfd_link_info *info; | |
560 | { | |
561 | struct fixup *f; | |
562 | asection *s; | |
563 | ||
564 | if (output_bfd->xvec != &MY(vec)) | |
b34976b6 | 565 | return TRUE; |
252b5132 RH |
566 | |
567 | /* First find the fixups... */ | |
568 | linux_link_hash_traverse (linux_hash_table (info), | |
569 | linux_tally_symbols, | |
570 | (PTR) info); | |
571 | ||
572 | /* If there are builtin fixups, leave room for a marker. This is | |
573 | used by the dynamic linker so that it knows that all that follow | |
574 | are builtin fixups instead of regular fixups. */ | |
575 | for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next) | |
576 | { | |
577 | if (f->builtin) | |
578 | { | |
579 | ++linux_hash_table (info)->fixup_count; | |
580 | ++linux_hash_table (info)->local_builtins; | |
581 | break; | |
582 | } | |
583 | } | |
584 | ||
585 | if (linux_hash_table (info)->dynobj == NULL) | |
586 | { | |
587 | if (linux_hash_table (info)->fixup_count > 0) | |
588 | abort (); | |
b34976b6 | 589 | return TRUE; |
252b5132 RH |
590 | } |
591 | ||
592 | /* Allocate memory for our fixup table. We will fill it in later. */ | |
593 | s = bfd_get_section_by_name (linux_hash_table (info)->dynobj, | |
594 | ".linux-dynamic"); | |
595 | if (s != NULL) | |
596 | { | |
eea6121a AM |
597 | s->size = linux_hash_table (info)->fixup_count + 1; |
598 | s->size *= 8; | |
599 | s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->size); | |
252b5132 | 600 | if (s->contents == NULL) |
b34976b6 | 601 | return FALSE; |
252b5132 RH |
602 | } |
603 | ||
b34976b6 | 604 | return TRUE; |
252b5132 RH |
605 | } |
606 | ||
607 | /* We come here once we are ready to actually write the fixup table to | |
608 | the output file. Scan the fixup tables and so forth and generate | |
609 | the stuff we need. */ | |
610 | ||
b34976b6 | 611 | static bfd_boolean |
252b5132 RH |
612 | linux_finish_dynamic_link (output_bfd, info) |
613 | bfd *output_bfd; | |
614 | struct bfd_link_info *info; | |
615 | { | |
616 | asection *s, *os, *is; | |
617 | bfd_byte *fixup_table; | |
618 | struct linux_link_hash_entry *h; | |
619 | struct fixup *f; | |
620 | unsigned int new_addr; | |
621 | int section_offset; | |
622 | unsigned int fixups_written; | |
623 | ||
624 | if (linux_hash_table (info)->dynobj == NULL) | |
b34976b6 | 625 | return TRUE; |
252b5132 RH |
626 | |
627 | s = bfd_get_section_by_name (linux_hash_table (info)->dynobj, | |
628 | ".linux-dynamic"); | |
629 | BFD_ASSERT (s != NULL); | |
630 | os = s->output_section; | |
631 | fixups_written = 0; | |
632 | ||
633 | #ifdef LINUX_LINK_DEBUG | |
dc810e39 | 634 | printf ("Fixup table file offset: %x VMA: %x\n", |
252b5132 RH |
635 | os->filepos + s->output_offset, |
636 | os->vma + s->output_offset); | |
637 | #endif | |
638 | ||
639 | fixup_table = s->contents; | |
dc810e39 AM |
640 | bfd_put_32 (output_bfd, |
641 | (bfd_vma) linux_hash_table (info)->fixup_count, fixup_table); | |
252b5132 RH |
642 | fixup_table += 4; |
643 | ||
644 | /* Fill in fixup table. */ | |
645 | for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next) | |
646 | { | |
647 | if (f->builtin) | |
648 | continue; | |
649 | ||
650 | if (f->h->root.root.type != bfd_link_hash_defined | |
651 | && f->h->root.root.type != bfd_link_hash_defweak) | |
652 | { | |
653 | (*_bfd_error_handler) | |
654 | (_("Symbol %s not defined for fixups\n"), | |
655 | f->h->root.root.root.string); | |
656 | continue; | |
657 | } | |
658 | ||
659 | is = f->h->root.root.u.def.section; | |
660 | section_offset = is->output_section->vma + is->output_offset; | |
661 | new_addr = f->h->root.root.u.def.value + section_offset; | |
662 | ||
663 | #ifdef LINUX_LINK_DEBUG | |
664 | printf ("Fixup(%d) %s: %x %x\n",f->jump, f->h->root.root.string, | |
665 | new_addr, f->value); | |
666 | #endif | |
667 | ||
668 | if (f->jump) | |
669 | { | |
670 | /* Relative address */ | |
dc810e39 AM |
671 | new_addr = new_addr - (f->value + 5); |
672 | bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table); | |
252b5132 RH |
673 | fixup_table += 4; |
674 | bfd_put_32 (output_bfd, f->value + 1, fixup_table); | |
675 | fixup_table += 4; | |
676 | } | |
677 | else | |
678 | { | |
dc810e39 | 679 | bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table); |
252b5132 RH |
680 | fixup_table += 4; |
681 | bfd_put_32 (output_bfd, f->value, fixup_table); | |
682 | fixup_table += 4; | |
683 | } | |
684 | ++fixups_written; | |
685 | } | |
686 | ||
687 | if (linux_hash_table (info)->local_builtins != 0) | |
688 | { | |
689 | /* Special marker so we know to switch to the other type of fixup */ | |
dc810e39 | 690 | bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table); |
252b5132 | 691 | fixup_table += 4; |
dc810e39 | 692 | bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table); |
252b5132 RH |
693 | fixup_table += 4; |
694 | ++fixups_written; | |
695 | for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next) | |
696 | { | |
697 | if (! f->builtin) | |
698 | continue; | |
699 | ||
700 | if (f->h->root.root.type != bfd_link_hash_defined | |
701 | && f->h->root.root.type != bfd_link_hash_defweak) | |
702 | { | |
703 | (*_bfd_error_handler) | |
704 | (_("Symbol %s not defined for fixups\n"), | |
705 | f->h->root.root.root.string); | |
706 | continue; | |
707 | } | |
708 | ||
709 | is = f->h->root.root.u.def.section; | |
710 | section_offset = is->output_section->vma + is->output_offset; | |
711 | new_addr = f->h->root.root.u.def.value + section_offset; | |
712 | ||
713 | #ifdef LINUX_LINK_DEBUG | |
714 | printf ("Fixup(B) %s: %x %x\n", f->h->root.root.string, | |
715 | new_addr, f->value); | |
716 | #endif | |
717 | ||
dc810e39 | 718 | bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table); |
252b5132 RH |
719 | fixup_table += 4; |
720 | bfd_put_32 (output_bfd, f->value, fixup_table); | |
721 | fixup_table += 4; | |
722 | ++fixups_written; | |
723 | } | |
724 | } | |
725 | ||
726 | if (linux_hash_table (info)->fixup_count != fixups_written) | |
727 | { | |
728 | (*_bfd_error_handler) (_("Warning: fixup count mismatch\n")); | |
729 | while (linux_hash_table (info)->fixup_count > fixups_written) | |
730 | { | |
dc810e39 | 731 | bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table); |
252b5132 | 732 | fixup_table += 4; |
dc810e39 | 733 | bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table); |
252b5132 RH |
734 | fixup_table += 4; |
735 | ++fixups_written; | |
736 | } | |
737 | } | |
738 | ||
dc810e39 | 739 | h = linux_link_hash_lookup (linux_hash_table (info), |
252b5132 | 740 | "__BUILTIN_FIXUPS__", |
b34976b6 | 741 | FALSE, FALSE, FALSE); |
252b5132 RH |
742 | |
743 | if (h != NULL | |
744 | && (h->root.root.type == bfd_link_hash_defined | |
745 | || h->root.root.type == bfd_link_hash_defweak)) | |
746 | { | |
747 | is = h->root.root.u.def.section; | |
748 | section_offset = is->output_section->vma + is->output_offset; | |
749 | new_addr = h->root.root.u.def.value + section_offset; | |
750 | ||
751 | #ifdef LINUX_LINK_DEBUG | |
752 | printf ("Builtin fixup table at %x\n", new_addr); | |
753 | #endif | |
754 | ||
dc810e39 | 755 | bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table); |
252b5132 RH |
756 | } |
757 | else | |
dc810e39 | 758 | bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table); |
252b5132 | 759 | |
dc810e39 AM |
760 | if (bfd_seek (output_bfd, (file_ptr) (os->filepos + s->output_offset), |
761 | SEEK_SET) != 0) | |
b34976b6 | 762 | return FALSE; |
252b5132 | 763 | |
eea6121a | 764 | if (bfd_bwrite ((PTR) s->contents, s->size, output_bfd) != s->size) |
b34976b6 | 765 | return FALSE; |
252b5132 | 766 | |
b34976b6 | 767 | return TRUE; |
252b5132 RH |
768 | } |
769 | ||
770 | #define MY_bfd_link_hash_table_create linux_link_hash_table_create | |
771 | #define MY_add_one_symbol linux_add_one_symbol | |
772 | #define MY_finish_dynamic_link linux_finish_dynamic_link | |
773 | ||
774 | #define MY_zmagic_contiguous 1 | |
775 | ||
776 | #include "aout-target.h" |