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252b5132 | 1 | /* BFD back-end for linux flavored m68k a.out binaries. |
5f771d47 ILT |
2 | Copyright (C) 1992, 93, 94, 95, 96, 97, 98, 1999 |
3 | 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 | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
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 | |
26 | #define BYTES_IN_WORD 4 | |
27 | ||
28 | #define MACHTYPE_OK(mtype) ((mtype) == M_68020 || (mtype) == M_UNKNOWN) | |
29 | ||
30 | #include "bfd.h" | |
31 | #include "sysdep.h" | |
32 | #include "libbfd.h" | |
33 | #include "aout/aout64.h" | |
34 | #include "aout/stab_gnu.h" | |
35 | #include "aout/ar.h" | |
36 | #include "libaout.h" /* BFD a.out internal data structures */ | |
37 | ||
38 | #define TARGET_IS_BIG_ENDIAN_P | |
39 | #define DEFAULT_ARCH bfd_arch_m68k | |
40 | #define MY(OP) CAT(m68klinux_,OP) | |
41 | #define TARGETNAME "a.out-m68k-linux" | |
42 | ||
43 | extern const bfd_target MY(vec); | |
44 | ||
45 | /* We always generate QMAGIC files in preference to ZMAGIC files. It | |
46 | would be possible to make this a linker option, if that ever | |
47 | becomes important. */ | |
48 | ||
49 | static void MY_final_link_callback | |
50 | PARAMS ((bfd *, file_ptr *, file_ptr *, file_ptr *)); | |
51 | static boolean m68klinux_bfd_final_link | |
52 | PARAMS ((bfd *, struct bfd_link_info *)); | |
53 | static boolean m68klinux_write_object_contents PARAMS ((bfd *)); | |
54 | ||
55 | static boolean | |
56 | m68klinux_bfd_final_link (abfd, info) | |
57 | bfd *abfd; | |
58 | struct bfd_link_info *info; | |
59 | { | |
60 | obj_aout_subformat (abfd) = q_magic_format; | |
61 | return NAME(aout,final_link) (abfd, info, MY_final_link_callback); | |
62 | } | |
63 | ||
64 | #define MY_bfd_final_link m68klinux_bfd_final_link | |
65 | ||
66 | /* Set the machine type correctly. */ | |
67 | ||
68 | static boolean | |
69 | m68klinux_write_object_contents (abfd) | |
70 | bfd *abfd; | |
71 | { | |
72 | struct external_exec exec_bytes; | |
73 | struct internal_exec *execp = exec_hdr (abfd); | |
74 | ||
75 | N_SET_MACHTYPE (*execp, M_68020); | |
76 | ||
77 | obj_reloc_entry_size (abfd) = RELOC_STD_SIZE; | |
78 | ||
79 | WRITE_HEADERS(abfd, execp); | |
80 | ||
81 | return true; | |
82 | } | |
83 | ||
84 | #define MY_write_object_contents m68klinux_write_object_contents | |
85 | \f | |
86 | /* Code to link against Linux a.out shared libraries. */ | |
87 | ||
88 | /* See if a symbol name is a reference to the global offset table. */ | |
89 | ||
90 | #ifndef GOT_REF_PREFIX | |
91 | #define GOT_REF_PREFIX "__GOT_" | |
92 | #endif | |
93 | ||
94 | #define IS_GOT_SYM(name) \ | |
95 | (strncmp (name, GOT_REF_PREFIX, sizeof GOT_REF_PREFIX - 1) == 0) | |
96 | ||
97 | /* See if a symbol name is a reference to the procedure linkage table. */ | |
98 | ||
99 | #ifndef PLT_REF_PREFIX | |
100 | #define PLT_REF_PREFIX "__PLT_" | |
101 | #endif | |
102 | ||
103 | #define IS_PLT_SYM(name) \ | |
104 | (strncmp (name, PLT_REF_PREFIX, sizeof PLT_REF_PREFIX - 1) == 0) | |
105 | ||
106 | /* This string is used to generate specialized error messages. */ | |
107 | ||
108 | #ifndef NEEDS_SHRLIB | |
109 | #define NEEDS_SHRLIB "__NEEDS_SHRLIB_" | |
110 | #endif | |
111 | ||
112 | /* This special symbol is a set vector that contains a list of | |
113 | pointers to fixup tables. It will be present in any dynamicly | |
114 | linked file. The linker generated fixup table should also be added | |
115 | to the list, and it should always appear in the second slot (the | |
116 | first one is a dummy with a magic number that is defined in | |
117 | crt0.o). */ | |
118 | ||
119 | #ifndef SHARABLE_CONFLICTS | |
120 | #define SHARABLE_CONFLICTS "__SHARABLE_CONFLICTS__" | |
121 | #endif | |
122 | ||
123 | /* We keep a list of fixups. The terminology is a bit strange, but | |
124 | each fixup contains two 32 bit numbers. A regular fixup contains | |
125 | an address and a pointer, and at runtime we should store the | |
126 | address at the location pointed to by the pointer. A builtin fixup | |
127 | contains two pointers, and we should read the address using one | |
128 | pointer and store it at the location pointed to by the other | |
129 | pointer. Builtin fixups come into play when we have duplicate | |
130 | __GOT__ symbols for the same variable. The builtin fixup will copy | |
131 | the GOT pointer from one over into the other. */ | |
132 | ||
133 | struct fixup | |
134 | { | |
135 | struct fixup *next; | |
136 | struct linux_link_hash_entry *h; | |
137 | bfd_vma value; | |
138 | ||
139 | /* Nonzero if this is a jump instruction that needs to be fixed, | |
140 | zero if this is just a pointer */ | |
141 | char jump; | |
142 | ||
143 | char builtin; | |
144 | }; | |
145 | ||
146 | /* We don't need a special hash table entry structure, but we do need | |
147 | to keep some information between linker passes, so we use a special | |
148 | hash table. */ | |
149 | ||
150 | struct linux_link_hash_entry | |
151 | { | |
152 | struct aout_link_hash_entry root; | |
153 | }; | |
154 | ||
155 | struct linux_link_hash_table | |
156 | { | |
157 | struct aout_link_hash_table root; | |
158 | ||
159 | /* First dynamic object found in link. */ | |
160 | bfd *dynobj; | |
161 | ||
162 | /* Number of fixups. */ | |
163 | size_t fixup_count; | |
164 | ||
165 | /* Number of builtin fixups. */ | |
166 | size_t local_builtins; | |
167 | ||
168 | /* List of fixups. */ | |
169 | struct fixup *fixup_list; | |
170 | }; | |
171 | ||
172 | static struct bfd_hash_entry *linux_link_hash_newfunc | |
173 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
174 | static struct bfd_link_hash_table *linux_link_hash_table_create | |
175 | PARAMS ((bfd *)); | |
176 | static struct fixup *new_fixup | |
177 | PARAMS ((struct bfd_link_info *, struct linux_link_hash_entry *, | |
178 | bfd_vma, int)); | |
179 | static boolean linux_link_create_dynamic_sections | |
180 | PARAMS ((bfd *, struct bfd_link_info *)); | |
181 | static boolean linux_add_one_symbol | |
182 | PARAMS ((struct bfd_link_info *, bfd *, const char *, flagword, asection *, | |
183 | bfd_vma, const char *, boolean, boolean, | |
184 | struct bfd_link_hash_entry **)); | |
185 | static boolean linux_tally_symbols | |
186 | PARAMS ((struct linux_link_hash_entry *, PTR)); | |
187 | static boolean linux_finish_dynamic_link | |
188 | PARAMS ((bfd *, struct bfd_link_info *)); | |
189 | ||
190 | /* Routine to create an entry in an Linux link hash table. */ | |
191 | ||
192 | static struct bfd_hash_entry * | |
193 | linux_link_hash_newfunc (entry, table, string) | |
194 | struct bfd_hash_entry *entry; | |
195 | struct bfd_hash_table *table; | |
196 | const char *string; | |
197 | { | |
198 | struct linux_link_hash_entry *ret = (struct linux_link_hash_entry *) entry; | |
199 | ||
200 | /* Allocate the structure if it has not already been allocated by a | |
201 | subclass. */ | |
202 | if (ret == (struct linux_link_hash_entry *) NULL) | |
203 | ret = ((struct linux_link_hash_entry *) | |
204 | bfd_hash_allocate (table, sizeof (struct linux_link_hash_entry))); | |
205 | if (ret == NULL) | |
206 | return (struct bfd_hash_entry *) ret; | |
207 | ||
208 | /* Call the allocation method of the superclass. */ | |
209 | ret = ((struct linux_link_hash_entry *) | |
210 | NAME(aout,link_hash_newfunc) ((struct bfd_hash_entry *) ret, | |
211 | table, string)); | |
212 | if (ret != NULL) | |
213 | { | |
214 | /* Set local fields; there aren't any. */ | |
215 | } | |
216 | ||
217 | return (struct bfd_hash_entry *) ret; | |
218 | } | |
219 | ||
220 | /* Create a Linux link hash table. */ | |
221 | ||
222 | static struct bfd_link_hash_table * | |
223 | linux_link_hash_table_create (abfd) | |
224 | bfd *abfd; | |
225 | { | |
226 | struct linux_link_hash_table *ret; | |
227 | ||
228 | ret = ((struct linux_link_hash_table *) | |
229 | bfd_alloc (abfd, sizeof (struct linux_link_hash_table))); | |
230 | if (ret == (struct linux_link_hash_table *) NULL) | |
231 | { | |
232 | bfd_set_error (bfd_error_no_memory); | |
233 | return (struct bfd_link_hash_table *) NULL; | |
234 | } | |
235 | if (! NAME(aout,link_hash_table_init) (&ret->root, abfd, | |
236 | linux_link_hash_newfunc)) | |
237 | { | |
238 | free (ret); | |
239 | return (struct bfd_link_hash_table *) NULL; | |
240 | } | |
241 | ||
242 | ret->dynobj = NULL; | |
243 | ret->fixup_count = 0; | |
244 | ret->local_builtins = 0; | |
245 | ret->fixup_list = NULL; | |
246 | ||
247 | return &ret->root.root; | |
248 | } | |
249 | ||
250 | /* Look up an entry in a Linux link hash table. */ | |
251 | ||
252 | #define linux_link_hash_lookup(table, string, create, copy, follow) \ | |
253 | ((struct linux_link_hash_entry *) \ | |
254 | aout_link_hash_lookup (&(table)->root, (string), (create), (copy),\ | |
255 | (follow))) | |
256 | ||
257 | /* Traverse a Linux link hash table. */ | |
258 | ||
259 | #define linux_link_hash_traverse(table, func, info) \ | |
260 | (aout_link_hash_traverse \ | |
261 | (&(table)->root, \ | |
262 | (boolean (*) PARAMS ((struct aout_link_hash_entry *, PTR))) (func), \ | |
263 | (info))) | |
264 | ||
265 | /* Get the Linux link hash table from the info structure. This is | |
266 | just a cast. */ | |
267 | ||
268 | #define linux_hash_table(p) ((struct linux_link_hash_table *) ((p)->hash)) | |
269 | ||
270 | /* Store the information for a new fixup. */ | |
271 | ||
272 | static struct fixup * | |
273 | new_fixup (info, h, value, builtin) | |
274 | struct bfd_link_info *info; | |
275 | struct linux_link_hash_entry *h; | |
276 | bfd_vma value; | |
277 | int builtin; | |
278 | { | |
279 | struct fixup *f; | |
280 | ||
281 | f = (struct fixup *) bfd_hash_allocate (&info->hash->table, | |
282 | sizeof (struct fixup)); | |
283 | if (f == NULL) | |
284 | return f; | |
285 | f->next = linux_hash_table (info)->fixup_list; | |
286 | linux_hash_table (info)->fixup_list = f; | |
287 | f->h = h; | |
288 | f->value = value; | |
289 | f->builtin = builtin; | |
290 | f->jump = 0; | |
291 | ++linux_hash_table (info)->fixup_count; | |
292 | return f; | |
293 | } | |
294 | ||
295 | /* We come here once we realize that we are going to link to a shared | |
296 | library. We need to create a special section that contains the | |
297 | fixup table, and we ultimately need to add a pointer to this into | |
298 | the set vector for SHARABLE_CONFLICTS. At this point we do not | |
299 | know the size of the section, but that's OK - we just need to | |
300 | create it for now. */ | |
301 | ||
302 | static boolean | |
303 | linux_link_create_dynamic_sections (abfd, info) | |
304 | bfd *abfd; | |
121089cb | 305 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
306 | { |
307 | flagword flags; | |
308 | register asection *s; | |
309 | ||
310 | /* Note that we set the SEC_IN_MEMORY flag. */ | |
311 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; | |
312 | ||
313 | /* We choose to use the name ".linux-dynamic" for the fixup table. | |
314 | Why not? */ | |
315 | s = bfd_make_section (abfd, ".linux-dynamic"); | |
316 | if (s == NULL | |
317 | || ! bfd_set_section_flags (abfd, s, flags) | |
318 | || ! bfd_set_section_alignment (abfd, s, 2)) | |
319 | return false; | |
320 | s->_raw_size = 0; | |
321 | s->contents = 0; | |
322 | ||
323 | return true; | |
324 | } | |
325 | ||
326 | /* Function to add a single symbol to the linker hash table. This is | |
327 | a wrapper around _bfd_generic_link_add_one_symbol which handles the | |
328 | tweaking needed for dynamic linking support. */ | |
329 | ||
330 | static boolean | |
331 | linux_add_one_symbol (info, abfd, name, flags, section, value, string, | |
332 | copy, collect, hashp) | |
333 | struct bfd_link_info *info; | |
334 | bfd *abfd; | |
335 | const char *name; | |
336 | flagword flags; | |
337 | asection *section; | |
338 | bfd_vma value; | |
339 | const char *string; | |
340 | boolean copy; | |
341 | boolean collect; | |
342 | struct bfd_link_hash_entry **hashp; | |
343 | { | |
344 | struct linux_link_hash_entry *h; | |
345 | boolean insert; | |
346 | ||
347 | /* Look up and see if we already have this symbol in the hash table. | |
348 | If we do, and the defining entry is from a shared library, we | |
349 | need to create the dynamic sections. | |
350 | ||
351 | FIXME: What if abfd->xvec != info->hash->creator? We may want to | |
352 | be able to link Linux a.out and ELF objects together, but serious | |
353 | confusion is possible. */ | |
354 | ||
355 | insert = false; | |
356 | ||
357 | if (! info->relocateable | |
358 | && linux_hash_table (info)->dynobj == NULL | |
359 | && strcmp (name, SHARABLE_CONFLICTS) == 0 | |
360 | && (flags & BSF_CONSTRUCTOR) != 0 | |
361 | && abfd->xvec == info->hash->creator) | |
362 | { | |
363 | if (! linux_link_create_dynamic_sections (abfd, info)) | |
364 | return false; | |
365 | linux_hash_table (info)->dynobj = abfd; | |
366 | insert = true; | |
367 | } | |
368 | ||
369 | if (bfd_is_abs_section (section) | |
370 | && abfd->xvec == info->hash->creator) | |
371 | { | |
372 | h = linux_link_hash_lookup (linux_hash_table (info), name, false, | |
373 | false, false); | |
374 | if (h != NULL | |
375 | && (h->root.root.type == bfd_link_hash_defined | |
376 | || h->root.root.type == bfd_link_hash_defweak)) | |
377 | { | |
378 | struct fixup *f; | |
379 | ||
380 | if (hashp != NULL) | |
381 | *hashp = (struct bfd_link_hash_entry *) h; | |
382 | ||
383 | f = new_fixup (info, h, value, ! IS_PLT_SYM (name)); | |
384 | if (f == NULL) | |
385 | return false; | |
386 | f->jump = IS_PLT_SYM (name); | |
387 | ||
388 | return true; | |
389 | } | |
390 | } | |
391 | ||
392 | /* Do the usual procedure for adding a symbol. */ | |
393 | if (! _bfd_generic_link_add_one_symbol (info, abfd, name, flags, section, | |
394 | value, string, copy, collect, | |
395 | hashp)) | |
396 | return false; | |
397 | ||
398 | /* Insert a pointer to our table in the set vector. The dynamic | |
399 | linker requires this information */ | |
400 | if (insert) | |
401 | { | |
402 | asection *s; | |
403 | ||
404 | /* Here we do our special thing to add the pointer to the | |
405 | dynamic section in the SHARABLE_CONFLICTS set vector. */ | |
406 | s = bfd_get_section_by_name (linux_hash_table (info)->dynobj, | |
407 | ".linux-dynamic"); | |
408 | BFD_ASSERT (s != NULL); | |
409 | ||
410 | if (! (_bfd_generic_link_add_one_symbol | |
411 | (info, linux_hash_table (info)->dynobj, SHARABLE_CONFLICTS, | |
412 | BSF_GLOBAL | BSF_CONSTRUCTOR, s, 0, NULL, false, false, NULL))) | |
413 | return false; | |
414 | } | |
415 | ||
416 | return true; | |
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 | ||
429 | static boolean | |
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; | |
438 | boolean exists; | |
439 | ||
440 | if (h->root.root.type == bfd_link_hash_undefined | |
441 | && strncmp (h->root.root.root.string, NEEDS_SHRLIB, | |
442 | sizeof NEEDS_SHRLIB - 1) == 0) | |
443 | { | |
444 | const char *name; | |
445 | char *p; | |
446 | char *alloc = NULL; | |
447 | ||
448 | name = h->root.root.root.string + sizeof NEEDS_SHRLIB - 1; | |
449 | p = strrchr (name, '_'); | |
450 | if (p != NULL) | |
451 | alloc = (char *) bfd_malloc (strlen (name) + 1); | |
452 | ||
453 | if (p == NULL || alloc == NULL) | |
454 | (*_bfd_error_handler) (_("Output file requires shared library `%s'\n"), | |
455 | name); | |
456 | else | |
457 | { | |
458 | strcpy (alloc, name); | |
459 | p = strrchr (alloc, '_'); | |
460 | *p++ = '\0'; | |
461 | (*_bfd_error_handler) | |
462 | (_("Output file requires shared library `%s.so.%s'\n"), | |
463 | alloc, p); | |
464 | free (alloc); | |
465 | } | |
466 | ||
467 | abort (); | |
468 | } | |
469 | ||
470 | /* If this symbol is not a PLT/GOT, we do not even need to look at it */ | |
471 | is_plt = IS_PLT_SYM (h->root.root.root.string); | |
472 | ||
473 | if (is_plt || IS_GOT_SYM (h->root.root.root.string)) | |
474 | { | |
475 | /* Look up this symbol twice. Once just as a regular lookup, | |
476 | and then again following all of the indirect links until we | |
477 | reach a real symbol. */ | |
478 | h1 = linux_link_hash_lookup (linux_hash_table (info), | |
479 | (h->root.root.root.string | |
480 | + sizeof PLT_REF_PREFIX - 1), | |
481 | false, false, true); | |
482 | /* h2 does not follow indirect symbols. */ | |
483 | h2 = linux_link_hash_lookup (linux_hash_table (info), | |
484 | (h->root.root.root.string | |
485 | + sizeof PLT_REF_PREFIX - 1), | |
486 | false, false, false); | |
487 | ||
488 | /* The real symbol must exist but if it is also an ABS symbol, | |
489 | there is no need to have a fixup. This is because they both | |
490 | came from the same library. If on the other hand, we had to | |
491 | use an indirect symbol to get to the real symbol, we add the | |
492 | fixup anyway, since there are cases where these symbols come | |
493 | from different shared libraries */ | |
494 | if (h1 != NULL | |
495 | && (((h1->root.root.type == bfd_link_hash_defined | |
496 | || h1->root.root.type == bfd_link_hash_defweak) | |
497 | && ! bfd_is_abs_section (h1->root.root.u.def.section)) | |
498 | || h2->root.root.type == bfd_link_hash_indirect)) | |
499 | { | |
500 | /* See if there is a "builtin" fixup already present | |
501 | involving this symbol. If so, convert it to a regular | |
502 | fixup. In the end, this relaxes some of the requirements | |
503 | about the order of performing fixups. */ | |
504 | exists = false; | |
505 | for (f1 = linux_hash_table (info)->fixup_list; | |
506 | f1 != NULL; | |
507 | f1 = f1->next) | |
508 | { | |
509 | if ((f1->h != h && f1->h != h1) | |
510 | || (! f1->builtin && ! f1->jump)) | |
511 | continue; | |
512 | if (f1->h == h1) | |
513 | exists = true; | |
514 | if (! exists | |
515 | && bfd_is_abs_section (h->root.root.u.def.section)) | |
516 | { | |
517 | f = new_fixup (info, h1, f1->h->root.root.u.def.value, 0); | |
518 | f->jump = is_plt; | |
519 | } | |
520 | f1->h = h1; | |
521 | f1->jump = is_plt; | |
522 | f1->builtin = 0; | |
523 | exists = true; | |
524 | } | |
525 | if (! exists | |
526 | && bfd_is_abs_section (h->root.root.u.def.section)) | |
527 | { | |
528 | f = new_fixup (info, h1, h->root.root.u.def.value, 0); | |
529 | if (f == NULL) | |
530 | { | |
531 | /* FIXME: No way to return error. */ | |
532 | abort (); | |
533 | } | |
534 | f->jump = is_plt; | |
535 | } | |
536 | } | |
537 | ||
538 | /* Quick and dirty way of stripping these symbols from the | |
539 | symtab. */ | |
540 | if (bfd_is_abs_section (h->root.root.u.def.section)) | |
541 | h->root.written = true; | |
542 | } | |
543 | ||
544 | return true; | |
545 | } | |
546 | ||
547 | /* This is called to set the size of the .linux-dynamic section is. | |
548 | It is called by the Linux linker emulation before_allocation | |
549 | routine. We have finished reading all of the input files, and now | |
550 | we just scan the hash tables to find out how many additional fixups | |
551 | are required. */ | |
552 | ||
553 | boolean | |
554 | bfd_m68klinux_size_dynamic_sections (output_bfd, info) | |
555 | bfd *output_bfd; | |
556 | struct bfd_link_info *info; | |
557 | { | |
558 | struct fixup *f; | |
559 | asection *s; | |
560 | ||
561 | if (output_bfd->xvec != &MY(vec)) | |
562 | return true; | |
563 | ||
564 | /* First find the fixups... */ | |
565 | linux_link_hash_traverse (linux_hash_table (info), | |
566 | linux_tally_symbols, | |
567 | (PTR) info); | |
568 | ||
569 | /* If there are builtin fixups, leave room for a marker. This is | |
570 | used by the dynamic linker so that it knows that all that follow | |
571 | are builtin fixups instead of regular fixups. */ | |
572 | for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next) | |
573 | { | |
574 | if (f->builtin) | |
575 | { | |
576 | ++linux_hash_table (info)->fixup_count; | |
577 | ++linux_hash_table (info)->local_builtins; | |
578 | break; | |
579 | } | |
580 | } | |
581 | ||
582 | if (linux_hash_table (info)->dynobj == NULL) | |
583 | { | |
584 | if (linux_hash_table (info)->fixup_count > 0) | |
585 | abort (); | |
586 | return true; | |
587 | } | |
588 | ||
589 | /* Allocate memory for our fixup table. We will fill it in later. */ | |
590 | s = bfd_get_section_by_name (linux_hash_table (info)->dynobj, | |
591 | ".linux-dynamic"); | |
592 | if (s != NULL) | |
593 | { | |
594 | s->_raw_size = 8 + linux_hash_table (info)->fixup_count * 8; | |
595 | s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size); | |
596 | if (s->contents == NULL) | |
597 | { | |
598 | bfd_set_error (bfd_error_no_memory); | |
599 | return false; | |
600 | } | |
601 | memset (s->contents, 0, (size_t) s->_raw_size); | |
602 | } | |
603 | ||
604 | return true; | |
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 | ||
611 | static boolean | |
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) | |
625 | return true; | |
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 | |
634 | printf ("Fixup table file offset: %x VMA: %x\n", | |
635 | os->filepos + s->output_offset, | |
636 | os->vma + s->output_offset); | |
637 | #endif | |
638 | ||
639 | fixup_table = s->contents; | |
640 | bfd_put_32 (output_bfd, linux_hash_table (info)->fixup_count, fixup_table); | |
641 | fixup_table += 4; | |
642 | ||
643 | /* Fill in fixup table. */ | |
644 | for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next) | |
645 | { | |
646 | if (f->builtin) | |
647 | continue; | |
648 | ||
649 | if (f->h->root.root.type != bfd_link_hash_defined | |
650 | && f->h->root.root.type != bfd_link_hash_defweak) | |
651 | { | |
652 | (*_bfd_error_handler) | |
653 | (_("Symbol %s not defined for fixups\n"), | |
654 | f->h->root.root.root.string); | |
655 | continue; | |
656 | } | |
657 | ||
658 | is = f->h->root.root.u.def.section; | |
659 | section_offset = is->output_section->vma + is->output_offset; | |
660 | new_addr = f->h->root.root.u.def.value + section_offset; | |
661 | ||
662 | #ifdef LINUX_LINK_DEBUG | |
663 | printf ("Fixup(%d) %s: %x %x\n",f->jump, f->h->root.root.string, | |
664 | new_addr, f->value); | |
665 | #endif | |
666 | ||
667 | if (f->jump) | |
668 | { | |
669 | bfd_put_32 (output_bfd, new_addr, fixup_table); | |
670 | fixup_table += 4; | |
671 | bfd_put_32 (output_bfd, f->value + 2, fixup_table); | |
672 | fixup_table += 4; | |
673 | } | |
674 | else | |
675 | { | |
676 | bfd_put_32 (output_bfd, new_addr, fixup_table); | |
677 | fixup_table += 4; | |
678 | bfd_put_32 (output_bfd, f->value, fixup_table); | |
679 | fixup_table += 4; | |
680 | } | |
681 | ++fixups_written; | |
682 | } | |
683 | ||
684 | if (linux_hash_table (info)->local_builtins != 0) | |
685 | { | |
686 | /* Special marker so we know to switch to the other type of fixup */ | |
687 | bfd_put_32 (output_bfd, 0, fixup_table); | |
688 | fixup_table += 4; | |
689 | bfd_put_32 (output_bfd, 0, fixup_table); | |
690 | fixup_table += 4; | |
691 | ++fixups_written; | |
692 | for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next) | |
693 | { | |
694 | if (! f->builtin) | |
695 | continue; | |
696 | ||
697 | if (f->h->root.root.type != bfd_link_hash_defined | |
698 | && f->h->root.root.type != bfd_link_hash_defweak) | |
699 | { | |
700 | (*_bfd_error_handler) | |
701 | (_("Symbol %s not defined for fixups\n"), | |
702 | f->h->root.root.root.string); | |
703 | continue; | |
704 | } | |
705 | ||
706 | is = f->h->root.root.u.def.section; | |
707 | section_offset = is->output_section->vma + is->output_offset; | |
708 | new_addr = f->h->root.root.u.def.value + section_offset; | |
709 | ||
710 | #ifdef LINUX_LINK_DEBUG | |
711 | printf ("Fixup(B) %s: %x %x\n", f->h->root.root.string, | |
712 | new_addr, f->value); | |
713 | #endif | |
714 | ||
715 | bfd_put_32 (output_bfd, new_addr, fixup_table); | |
716 | fixup_table += 4; | |
717 | bfd_put_32 (output_bfd, f->value, fixup_table); | |
718 | fixup_table += 4; | |
719 | ++fixups_written; | |
720 | } | |
721 | } | |
722 | ||
723 | if (linux_hash_table (info)->fixup_count != fixups_written) | |
724 | { | |
725 | (*_bfd_error_handler) (_("Warning: fixup count mismatch\n")); | |
726 | while (linux_hash_table (info)->fixup_count > fixups_written) | |
727 | { | |
728 | bfd_put_32 (output_bfd, 0, fixup_table); | |
729 | fixup_table += 4; | |
730 | bfd_put_32 (output_bfd, 0, fixup_table); | |
731 | fixup_table += 4; | |
732 | ++fixups_written; | |
733 | } | |
734 | } | |
735 | ||
736 | h = linux_link_hash_lookup (linux_hash_table (info), | |
737 | "__BUILTIN_FIXUPS__", | |
738 | false, false, false); | |
739 | ||
740 | if (h != NULL | |
741 | && (h->root.root.type == bfd_link_hash_defined | |
742 | || h->root.root.type == bfd_link_hash_defweak)) | |
743 | { | |
744 | is = h->root.root.u.def.section; | |
745 | section_offset = is->output_section->vma + is->output_offset; | |
746 | new_addr = h->root.root.u.def.value + section_offset; | |
747 | ||
748 | #ifdef LINUX_LINK_DEBUG | |
749 | printf ("Builtin fixup table at %x\n", new_addr); | |
750 | #endif | |
751 | ||
752 | bfd_put_32 (output_bfd, new_addr, fixup_table); | |
753 | } | |
754 | else | |
755 | bfd_put_32 (output_bfd, 0, fixup_table); | |
756 | ||
757 | if (bfd_seek (output_bfd, os->filepos + s->output_offset, SEEK_SET) != 0) | |
758 | return false; | |
759 | ||
760 | if (bfd_write ((PTR) s->contents, 1, s->_raw_size, output_bfd) | |
761 | != s->_raw_size) | |
762 | return false; | |
763 | ||
764 | return true; | |
765 | } | |
766 | ||
767 | #define MY_bfd_link_hash_table_create linux_link_hash_table_create | |
768 | #define MY_add_one_symbol linux_add_one_symbol | |
769 | #define MY_finish_dynamic_link linux_finish_dynamic_link | |
770 | ||
771 | #define MY_zmagic_contiguous 1 | |
772 | ||
773 | #include "aout-target.h" |