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c906108c SS |
1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
2 | Copyright 1991, 92, 93, 94, 95, 96, 1998 Free Software Foundation, Inc. | |
3 | Written by Fred Fish at Cygnus Support. | |
4 | ||
5 | This file is part of GDB. | |
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 | #include "defs.h" | |
22 | #include "bfd.h" | |
23 | #include "gdb_string.h" | |
24 | #include "elf-bfd.h" | |
25 | #include "elf/mips.h" | |
26 | #include "symtab.h" | |
27 | #include "symfile.h" | |
28 | #include "objfiles.h" | |
29 | #include "buildsym.h" | |
30 | #include "stabsread.h" | |
31 | #include "gdb-stabs.h" | |
32 | #include "complaints.h" | |
33 | #include "demangle.h" | |
34 | ||
35 | /* The struct elfinfo is available only during ELF symbol table and | |
36 | psymtab reading. It is destroyed at the complation of psymtab-reading. | |
37 | It's local to elf_symfile_read. */ | |
38 | ||
39 | struct elfinfo { | |
40 | file_ptr dboffset; /* Offset to dwarf debug section */ | |
41 | unsigned int dbsize; /* Size of dwarf debug section */ | |
42 | file_ptr lnoffset; /* Offset to dwarf line number section */ | |
43 | unsigned int lnsize; /* Size of dwarf line number section */ | |
44 | asection *stabsect; /* Section pointer for .stab section */ | |
45 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
46 | asection *mdebugsect; /* Section pointer for .mdebug section */ | |
47 | }; | |
48 | ||
49 | /* Various things we might complain about... */ | |
50 | ||
51 | struct complaint section_info_complaint = | |
52 | {"elf/stab section information %s without a preceding file symbol", 0, 0}; | |
53 | ||
54 | struct complaint section_info_dup_complaint = | |
55 | {"duplicated elf/stab section information for %s", 0, 0}; | |
56 | ||
57 | struct complaint stab_info_mismatch_complaint = | |
58 | {"elf/stab section information missing for %s", 0, 0}; | |
59 | ||
60 | struct complaint stab_info_questionable_complaint = | |
61 | {"elf/stab section information questionable for %s", 0, 0}; | |
62 | ||
63 | static void | |
64 | elf_symfile_init PARAMS ((struct objfile *)); | |
65 | ||
66 | static void | |
67 | elf_new_init PARAMS ((struct objfile *)); | |
68 | ||
69 | static void | |
70 | elf_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); | |
71 | ||
72 | static void | |
73 | elf_symfile_finish PARAMS ((struct objfile *)); | |
74 | ||
75 | static void | |
76 | elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *, int)); | |
77 | ||
78 | static void | |
79 | free_elfinfo PARAMS ((void *)); | |
80 | ||
81 | static struct minimal_symbol * | |
82 | record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR, | |
83 | enum minimal_symbol_type, char *, | |
84 | asection *bfd_section, | |
85 | struct objfile *)); | |
86 | ||
87 | static void | |
88 | elf_locate_sections PARAMS ((bfd *, asection *, void *)); | |
89 | ||
90 | /* We are called once per section from elf_symfile_read. We | |
91 | need to examine each section we are passed, check to see | |
92 | if it is something we are interested in processing, and | |
93 | if so, stash away some access information for the section. | |
94 | ||
95 | For now we recognize the dwarf debug information sections and | |
96 | line number sections from matching their section names. The | |
97 | ELF definition is no real help here since it has no direct | |
98 | knowledge of DWARF (by design, so any debugging format can be | |
99 | used). | |
100 | ||
101 | We also recognize the ".stab" sections used by the Sun compilers | |
102 | released with Solaris 2. | |
103 | ||
104 | FIXME: The section names should not be hardwired strings (what | |
105 | should they be? I don't think most object file formats have enough | |
106 | section flags to specify what kind of debug section it is | |
107 | -kingdon). */ | |
108 | ||
109 | static void | |
110 | elf_locate_sections (ignore_abfd, sectp, eip) | |
111 | bfd *ignore_abfd; | |
112 | asection *sectp; | |
113 | PTR eip; | |
114 | { | |
115 | register struct elfinfo *ei; | |
116 | ||
117 | ei = (struct elfinfo *) eip; | |
118 | if (STREQ (sectp -> name, ".debug")) | |
119 | { | |
120 | ei -> dboffset = sectp -> filepos; | |
121 | ei -> dbsize = bfd_get_section_size_before_reloc (sectp); | |
122 | } | |
123 | else if (STREQ (sectp -> name, ".line")) | |
124 | { | |
125 | ei -> lnoffset = sectp -> filepos; | |
126 | ei -> lnsize = bfd_get_section_size_before_reloc (sectp); | |
127 | } | |
128 | else if (STREQ (sectp -> name, ".stab")) | |
129 | { | |
130 | ei -> stabsect = sectp; | |
131 | } | |
132 | else if (STREQ (sectp -> name, ".stab.index")) | |
133 | { | |
134 | ei -> stabindexsect = sectp; | |
135 | } | |
136 | else if (STREQ (sectp -> name, ".mdebug")) | |
137 | { | |
138 | ei -> mdebugsect = sectp; | |
139 | } | |
140 | } | |
141 | ||
142 | #if 0 /* Currently unused */ | |
143 | ||
144 | char * | |
145 | elf_interpreter (abfd) | |
146 | bfd *abfd; | |
147 | { | |
148 | sec_ptr interp_sec; | |
149 | unsigned size; | |
150 | char *interp = NULL; | |
151 | ||
152 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
153 | if (interp_sec) | |
154 | { | |
155 | size = bfd_section_size (abfd, interp_sec); | |
156 | interp = alloca (size); | |
157 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr)0, | |
158 | size)) | |
159 | { | |
160 | interp = savestring (interp, size - 1); | |
161 | } | |
162 | else | |
163 | { | |
164 | interp = NULL; | |
165 | } | |
166 | } | |
167 | return (interp); | |
168 | } | |
169 | ||
170 | #endif | |
171 | ||
172 | static struct minimal_symbol * | |
173 | record_minimal_symbol_and_info (name, address, ms_type, info, bfd_section, | |
174 | objfile) | |
175 | char *name; | |
176 | CORE_ADDR address; | |
177 | enum minimal_symbol_type ms_type; | |
178 | char *info; /* FIXME, is this really char *? */ | |
179 | asection *bfd_section; | |
180 | struct objfile *objfile; | |
181 | { | |
182 | int section; | |
183 | ||
184 | /* Guess the section from the type. This is likely to be wrong in | |
185 | some cases. */ | |
186 | switch (ms_type) | |
187 | { | |
188 | case mst_text: | |
189 | case mst_file_text: | |
190 | section = SECT_OFF_TEXT; | |
191 | #ifdef SMASH_TEXT_ADDRESS | |
192 | SMASH_TEXT_ADDRESS (address); | |
193 | #endif | |
194 | break; | |
195 | case mst_data: | |
196 | case mst_file_data: | |
197 | section = SECT_OFF_DATA; | |
198 | break; | |
199 | case mst_bss: | |
200 | case mst_file_bss: | |
201 | section = SECT_OFF_BSS; | |
202 | break; | |
203 | default: | |
204 | section = -1; | |
205 | break; | |
206 | } | |
207 | ||
208 | return prim_record_minimal_symbol_and_info | |
209 | (name, address, ms_type, info, section, bfd_section, objfile); | |
210 | } | |
211 | ||
212 | /* | |
213 | ||
214 | LOCAL FUNCTION | |
215 | ||
216 | elf_symtab_read -- read the symbol table of an ELF file | |
217 | ||
218 | SYNOPSIS | |
219 | ||
220 | void elf_symtab_read (bfd *abfd, CORE_ADDR addr, | |
221 | struct objfile *objfile, int dynamic) | |
222 | ||
223 | DESCRIPTION | |
224 | ||
225 | Given an open bfd, a base address to relocate symbols to, and a | |
226 | flag that specifies whether or not this bfd is for an executable | |
227 | or not (may be shared library for example), add all the global | |
228 | function and data symbols to the minimal symbol table. | |
229 | ||
230 | In stabs-in-ELF, as implemented by Sun, there are some local symbols | |
231 | defined in the ELF symbol table, which can be used to locate | |
232 | the beginnings of sections from each ".o" file that was linked to | |
233 | form the executable objfile. We gather any such info and record it | |
234 | in data structures hung off the objfile's private data. | |
235 | ||
236 | */ | |
237 | ||
238 | static void | |
239 | elf_symtab_read (abfd, addr, objfile, dynamic) | |
240 | bfd *abfd; | |
241 | CORE_ADDR addr; | |
242 | struct objfile *objfile; | |
243 | int dynamic; | |
244 | { | |
245 | long storage_needed; | |
246 | asymbol *sym; | |
247 | asymbol **symbol_table; | |
248 | long number_of_symbols; | |
249 | long i; | |
250 | int index; | |
251 | struct cleanup *back_to; | |
252 | CORE_ADDR symaddr; | |
253 | enum minimal_symbol_type ms_type; | |
254 | /* If sectinfo is nonNULL, it contains section info that should end up | |
255 | filed in the objfile. */ | |
256 | struct stab_section_info *sectinfo = NULL; | |
257 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
258 | seen any section info for it yet. */ | |
259 | asymbol *filesym = 0; | |
260 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
261 | /* Name of filesym, as saved on the symbol_obstack. */ | |
262 | char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack); | |
263 | #endif | |
264 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
265 | unsigned long size; | |
266 | int stripped = (bfd_get_symcount (abfd) == 0); | |
267 | ||
268 | if (dynamic) | |
269 | { | |
270 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
271 | ||
272 | /* Nothing to be done if there is no dynamic symtab. */ | |
273 | if (storage_needed < 0) | |
274 | return; | |
275 | } | |
276 | else | |
277 | { | |
278 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
279 | if (storage_needed < 0) | |
280 | error ("Can't read symbols from %s: %s", bfd_get_filename (abfd), | |
281 | bfd_errmsg (bfd_get_error ())); | |
282 | } | |
283 | if (storage_needed > 0) | |
284 | { | |
285 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
286 | back_to = make_cleanup (free, symbol_table); | |
287 | if (dynamic) | |
288 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, | |
289 | symbol_table); | |
290 | else | |
291 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
292 | if (number_of_symbols < 0) | |
293 | error ("Can't read symbols from %s: %s", bfd_get_filename (abfd), | |
294 | bfd_errmsg (bfd_get_error ())); | |
295 | for (i = 0; i < number_of_symbols; i++) | |
296 | { | |
297 | sym = symbol_table[i]; | |
298 | if (sym -> name == NULL || *sym -> name == '\0') | |
299 | { | |
300 | /* Skip names that don't exist (shouldn't happen), or names | |
301 | that are null strings (may happen). */ | |
302 | continue; | |
303 | } | |
304 | ||
305 | if (dynamic | |
306 | && sym -> section == &bfd_und_section | |
307 | && (sym -> flags & BSF_FUNCTION)) | |
308 | { | |
309 | struct minimal_symbol *msym; | |
310 | ||
311 | /* Symbol is a reference to a function defined in | |
312 | a shared library. | |
313 | If its value is non zero then it is usually the address | |
314 | of the corresponding entry in the procedure linkage table, | |
315 | relative to the base address. | |
316 | If its value is zero then the dynamic linker has to resolve | |
317 | the symbol. We are unable to find any meaningful address | |
318 | for this symbol in the executable file, so we skip it. */ | |
319 | symaddr = sym -> value; | |
320 | if (symaddr == 0) | |
321 | continue; | |
322 | symaddr += addr; | |
323 | msym = record_minimal_symbol_and_info | |
324 | ((char *) sym -> name, symaddr, | |
325 | mst_solib_trampoline, NULL, sym -> section, objfile); | |
326 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
327 | if (msym != NULL) | |
328 | msym->filename = filesymname; | |
329 | #endif | |
330 | continue; | |
331 | } | |
332 | ||
333 | /* If it is a nonstripped executable, do not enter dynamic | |
334 | symbols, as the dynamic symbol table is usually a subset | |
335 | of the main symbol table. */ | |
336 | if (dynamic && !stripped) | |
337 | continue; | |
338 | if (sym -> flags & BSF_FILE) | |
339 | { | |
340 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
341 | Chain any old one onto the objfile; remember new sym. */ | |
342 | if (sectinfo != NULL) | |
343 | { | |
344 | sectinfo -> next = dbx -> stab_section_info; | |
345 | dbx -> stab_section_info = sectinfo; | |
346 | sectinfo = NULL; | |
347 | } | |
348 | filesym = sym; | |
349 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
350 | filesymname = | |
351 | obsavestring ((char *)filesym->name, strlen (filesym->name), | |
352 | &objfile->symbol_obstack); | |
353 | #endif | |
354 | } | |
355 | else if (sym -> flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) | |
356 | { | |
357 | struct minimal_symbol *msym; | |
358 | ||
359 | /* Select global/local/weak symbols. Note that bfd puts abs | |
360 | symbols in their own section, so all symbols we are | |
361 | interested in will have a section. */ | |
362 | /* Bfd symbols are section relative. */ | |
363 | symaddr = sym -> value + sym -> section -> vma; | |
364 | /* Relocate all non-absolute symbols by base address. */ | |
365 | if (sym -> section != &bfd_abs_section) | |
366 | { | |
367 | symaddr += addr; | |
368 | } | |
369 | /* For non-absolute symbols, use the type of the section | |
370 | they are relative to, to intuit text/data. Bfd provides | |
371 | no way of figuring this out for absolute symbols. */ | |
372 | if (sym -> section == &bfd_abs_section) | |
373 | { | |
374 | /* This is a hack to get the minimal symbol type | |
375 | right for Irix 5, which has absolute adresses | |
376 | with special section indices for dynamic symbols. */ | |
377 | unsigned short shndx = | |
378 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; | |
379 | ||
380 | switch (shndx) | |
381 | { | |
382 | case SHN_MIPS_TEXT: | |
383 | ms_type = mst_text; | |
384 | break; | |
385 | case SHN_MIPS_DATA: | |
386 | ms_type = mst_data; | |
387 | break; | |
388 | case SHN_MIPS_ACOMMON: | |
389 | ms_type = mst_bss; | |
390 | break; | |
391 | default: | |
392 | ms_type = mst_abs; | |
393 | } | |
394 | ||
395 | /* If it is an Irix dynamic symbol, skip section name | |
396 | symbols, relocate all others. */ | |
397 | if (ms_type != mst_abs) | |
398 | { | |
399 | if (sym->name[0] == '.') | |
400 | continue; | |
401 | symaddr += addr; | |
402 | } | |
403 | } | |
404 | else if (sym -> section -> flags & SEC_CODE) | |
405 | { | |
406 | if (sym -> flags & BSF_GLOBAL) | |
407 | { | |
408 | ms_type = mst_text; | |
409 | } | |
410 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') | |
411 | || ((sym -> flags & BSF_LOCAL) | |
412 | && sym->name[0] == '$' | |
413 | && sym->name[1] == 'L')) | |
414 | /* Looks like a compiler-generated label. Skip it. | |
415 | The assembler should be skipping these (to keep | |
416 | executables small), but apparently with gcc on the | |
417 | delta m88k SVR4, it loses. So to have us check too | |
418 | should be harmless (but I encourage people to fix this | |
419 | in the assembler instead of adding checks here). */ | |
420 | continue; | |
421 | #ifdef HARRIS_TARGET | |
422 | else if (sym->name[0] == '.' && sym->name[1] == '.') | |
423 | { | |
424 | /* Looks like a Harris compiler generated label for the | |
425 | purpose of marking instructions that are relevant to | |
426 | DWARF dies. The assembler can't get rid of these | |
427 | because they are relocatable addresses that the | |
428 | linker needs to resolve. */ | |
429 | continue; | |
430 | } | |
431 | #endif | |
432 | else | |
433 | { | |
434 | ms_type = mst_file_text; | |
435 | } | |
436 | } | |
437 | else if (sym -> section -> flags & SEC_ALLOC) | |
438 | { | |
439 | if (sym -> flags & BSF_GLOBAL) | |
440 | { | |
441 | if (sym -> section -> flags & SEC_LOAD) | |
442 | { | |
443 | ms_type = mst_data; | |
444 | } | |
445 | else | |
446 | { | |
447 | ms_type = mst_bss; | |
448 | } | |
449 | } | |
450 | else if (sym -> flags & BSF_LOCAL) | |
451 | { | |
452 | /* Named Local variable in a Data section. Check its | |
453 | name for stabs-in-elf. The STREQ macro checks the | |
454 | first character inline, so we only actually do a | |
455 | strcmp function call on names that start with 'B' | |
456 | or 'D' */ | |
457 | index = SECT_OFF_MAX; | |
458 | if (STREQ ("Bbss.bss", sym -> name)) | |
459 | { | |
460 | index = SECT_OFF_BSS; | |
461 | } | |
462 | else if (STREQ ("Ddata.data", sym -> name)) | |
463 | { | |
464 | index = SECT_OFF_DATA; | |
465 | } | |
466 | else if (STREQ ("Drodata.rodata", sym -> name)) | |
467 | { | |
468 | index = SECT_OFF_RODATA; | |
469 | } | |
470 | if (index != SECT_OFF_MAX) | |
471 | { | |
472 | /* Found a special local symbol. Allocate a | |
473 | sectinfo, if needed, and fill it in. */ | |
474 | if (sectinfo == NULL) | |
475 | { | |
476 | sectinfo = (struct stab_section_info *) | |
477 | xmmalloc (objfile -> md, sizeof (*sectinfo)); | |
478 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); | |
479 | if (filesym == NULL) | |
480 | { | |
481 | complain (§ion_info_complaint, | |
482 | sym -> name); | |
483 | } | |
484 | else | |
485 | { | |
486 | sectinfo -> filename = | |
487 | (char *) filesym -> name; | |
488 | } | |
489 | } | |
490 | if (sectinfo -> sections[index] != 0) | |
491 | { | |
492 | complain (§ion_info_dup_complaint, | |
493 | sectinfo -> filename); | |
494 | } | |
495 | /* Bfd symbols are section relative. */ | |
496 | symaddr = sym -> value + sym -> section -> vma; | |
497 | /* Relocate non-absolute symbols by base address. */ | |
498 | if (sym -> section != &bfd_abs_section) | |
499 | { | |
500 | symaddr += addr; | |
501 | } | |
502 | sectinfo -> sections[index] = symaddr; | |
503 | /* The special local symbols don't go in the | |
504 | minimal symbol table, so ignore this one. */ | |
505 | continue; | |
506 | } | |
507 | /* Not a special stabs-in-elf symbol, do regular | |
508 | symbol processing. */ | |
509 | if (sym -> section -> flags & SEC_LOAD) | |
510 | { | |
511 | ms_type = mst_file_data; | |
512 | } | |
513 | else | |
514 | { | |
515 | ms_type = mst_file_bss; | |
516 | } | |
517 | } | |
518 | else | |
519 | { | |
520 | ms_type = mst_unknown; | |
521 | } | |
522 | } | |
523 | else | |
524 | { | |
525 | /* FIXME: Solaris2 shared libraries include lots of | |
526 | odd "absolute" and "undefined" symbols, that play | |
527 | hob with actions like finding what function the PC | |
528 | is in. Ignore them if they aren't text, data, or bss. */ | |
529 | /* ms_type = mst_unknown; */ | |
530 | continue; /* Skip this symbol. */ | |
531 | } | |
532 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
533 | size = ((elf_symbol_type *) sym) -> internal_elf_sym.st_size; | |
534 | msym = record_minimal_symbol_and_info | |
535 | ((char *) sym -> name, symaddr, | |
536 | ms_type, (PTR) size, sym -> section, objfile); | |
537 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
538 | if (msym != NULL) | |
539 | msym->filename = filesymname; | |
540 | #endif | |
541 | #ifdef ELF_MAKE_MSYMBOL_SPECIAL | |
542 | ELF_MAKE_MSYMBOL_SPECIAL(sym,msym); | |
543 | #endif | |
544 | } | |
545 | } | |
546 | do_cleanups (back_to); | |
547 | } | |
548 | } | |
549 | ||
550 | /* Scan and build partial symbols for a symbol file. | |
551 | We have been initialized by a call to elf_symfile_init, which | |
552 | currently does nothing. | |
553 | ||
554 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
555 | in each section. We simplify it down to a single offset for all | |
556 | symbols. FIXME. | |
557 | ||
558 | MAINLINE is true if we are reading the main symbol | |
559 | table (as opposed to a shared lib or dynamically loaded file). | |
560 | ||
561 | This function only does the minimum work necessary for letting the | |
562 | user "name" things symbolically; it does not read the entire symtab. | |
563 | Instead, it reads the external and static symbols and puts them in partial | |
564 | symbol tables. When more extensive information is requested of a | |
565 | file, the corresponding partial symbol table is mutated into a full | |
566 | fledged symbol table by going back and reading the symbols | |
567 | for real. | |
568 | ||
569 | We look for sections with specific names, to tell us what debug | |
570 | format to look for: FIXME!!! | |
571 | ||
572 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
573 | elfstab_build_psymtabs() handles STABS symbols; | |
574 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
575 | ||
576 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
577 | like a COFF symbol table, but has only the minimal information necessary | |
578 | for linking. We process this also, and use the information to | |
579 | build gdb's minimal symbol table. This gives us some minimal debugging | |
580 | capability even for files compiled without -g. */ | |
581 | ||
582 | static void | |
583 | elf_symfile_read (objfile, section_offsets, mainline) | |
584 | struct objfile *objfile; | |
585 | struct section_offsets *section_offsets; | |
586 | int mainline; | |
587 | { | |
588 | bfd *abfd = objfile->obfd; | |
589 | struct elfinfo ei; | |
590 | struct cleanup *back_to; | |
591 | CORE_ADDR offset; | |
592 | ||
593 | init_minimal_symbol_collection (); | |
594 | back_to = make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0); | |
595 | ||
596 | memset ((char *) &ei, 0, sizeof (ei)); | |
597 | ||
598 | /* Allocate struct to keep track of the symfile */ | |
599 | objfile->sym_stab_info = (struct dbx_symfile_info *) | |
600 | xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); | |
601 | memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); | |
602 | make_cleanup (free_elfinfo, (PTR) objfile); | |
603 | ||
604 | /* Process the normal ELF symbol table first. This may write some | |
605 | chain of info into the dbx_symfile_info in objfile->sym_stab_info, | |
606 | which can later be used by elfstab_offset_sections. */ | |
607 | ||
608 | /* FIXME, should take a section_offsets param, not just an offset. */ | |
609 | offset = ANOFFSET (section_offsets, 0); | |
610 | elf_symtab_read (abfd, offset, objfile, 0); | |
611 | ||
612 | /* Add the dynamic symbols. */ | |
613 | ||
614 | elf_symtab_read (abfd, offset, objfile, 1); | |
615 | ||
616 | /* Now process debugging information, which is contained in | |
617 | special ELF sections. */ | |
618 | ||
619 | /* If we are reinitializing, or if we have never loaded syms yet, | |
620 | set table to empty. MAINLINE is cleared so that *_read_psymtab | |
621 | functions do not all also re-initialize the psymbol table. */ | |
622 | if (mainline) | |
623 | { | |
624 | init_psymbol_list (objfile, 0); | |
625 | mainline = 0; | |
626 | } | |
627 | ||
628 | /* We first have to find them... */ | |
629 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei); | |
630 | ||
631 | /* ELF debugging information is inserted into the psymtab in the | |
632 | order of least informative first - most informative last. Since | |
633 | the psymtab table is searched `most recent insertion first' this | |
634 | increases the probability that more detailed debug information | |
635 | for a section is found. | |
636 | ||
637 | For instance, an object file might contain both .mdebug (XCOFF) | |
638 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
639 | (searched last) and DWARF2 is inserted last (searched first). If | |
640 | we don't do this then the XCOFF info is found first - for code in | |
641 | an included file XCOFF info is useless. */ | |
642 | ||
643 | if (ei.mdebugsect) | |
644 | { | |
645 | const struct ecoff_debug_swap *swap; | |
646 | ||
647 | /* .mdebug section, presumably holding ECOFF debugging | |
648 | information. */ | |
649 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; | |
650 | if (swap) | |
651 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect, | |
652 | section_offsets); | |
653 | } | |
654 | if (ei.stabsect) | |
655 | { | |
656 | asection *str_sect; | |
657 | ||
658 | /* Stab sections have an associated string table that looks like | |
659 | a separate section. */ | |
660 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); | |
661 | ||
662 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
663 | if (str_sect) | |
664 | elfstab_build_psymtabs (objfile, | |
665 | section_offsets, | |
666 | mainline, | |
667 | ei.stabsect->filepos, | |
668 | bfd_section_size (abfd, ei.stabsect), | |
669 | str_sect->filepos, | |
670 | bfd_section_size (abfd, str_sect)); | |
671 | } | |
672 | if (dwarf2_has_info (abfd)) | |
673 | { | |
674 | /* DWARF 2 sections */ | |
675 | dwarf2_build_psymtabs (objfile, section_offsets, mainline); | |
676 | } | |
677 | else if (ei.dboffset && ei.lnoffset) | |
678 | { | |
679 | /* DWARF sections */ | |
680 | dwarf_build_psymtabs (objfile, | |
681 | section_offsets, mainline, | |
682 | ei.dboffset, ei.dbsize, | |
683 | ei.lnoffset, ei.lnsize); | |
684 | } | |
685 | ||
686 | /* Install any minimal symbols that have been collected as the current | |
687 | minimal symbols for this objfile. */ | |
688 | ||
689 | install_minimal_symbols (objfile); | |
690 | ||
691 | do_cleanups (back_to); | |
692 | } | |
693 | ||
694 | /* This cleans up the objfile's sym_stab_info pointer, and the chain of | |
695 | stab_section_info's, that might be dangling from it. */ | |
696 | ||
697 | static void | |
698 | free_elfinfo (objp) | |
699 | PTR objp; | |
700 | { | |
701 | struct objfile *objfile = (struct objfile *)objp; | |
702 | struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; | |
703 | struct stab_section_info *ssi, *nssi; | |
704 | ||
705 | ssi = dbxinfo->stab_section_info; | |
706 | while (ssi) | |
707 | { | |
708 | nssi = ssi->next; | |
709 | mfree (objfile->md, ssi); | |
710 | ssi = nssi; | |
711 | } | |
712 | ||
713 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
714 | } | |
715 | ||
716 | ||
717 | /* Initialize anything that needs initializing when a completely new symbol | |
718 | file is specified (not just adding some symbols from another file, e.g. a | |
719 | shared library). | |
720 | ||
721 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ | |
722 | ||
723 | static void | |
724 | elf_new_init (ignore) | |
725 | struct objfile *ignore; | |
726 | { | |
727 | stabsread_new_init (); | |
728 | buildsym_new_init (); | |
729 | } | |
730 | ||
731 | /* Perform any local cleanups required when we are done with a particular | |
732 | objfile. I.E, we are in the process of discarding all symbol information | |
733 | for an objfile, freeing up all memory held for it, and unlinking the | |
734 | objfile struct from the global list of known objfiles. */ | |
735 | ||
736 | static void | |
737 | elf_symfile_finish (objfile) | |
738 | struct objfile *objfile; | |
739 | { | |
740 | if (objfile -> sym_stab_info != NULL) | |
741 | { | |
742 | mfree (objfile -> md, objfile -> sym_stab_info); | |
743 | } | |
744 | } | |
745 | ||
746 | /* ELF specific initialization routine for reading symbols. | |
747 | ||
748 | It is passed a pointer to a struct sym_fns which contains, among other | |
749 | things, the BFD for the file whose symbols are being read, and a slot for | |
750 | a pointer to "private data" which we can fill with goodies. | |
751 | ||
752 | For now at least, we have nothing in particular to do, so this function is | |
753 | just a stub. */ | |
754 | ||
755 | static void | |
756 | elf_symfile_init (objfile) | |
757 | struct objfile *objfile; | |
758 | { | |
759 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
760 | find this causes a significant slowdown in gdb then we could | |
761 | set it in the debug symbol readers only when necessary. */ | |
762 | objfile->flags |= OBJF_REORDERED; | |
763 | } | |
764 | ||
765 | /* When handling an ELF file that contains Sun STABS debug info, | |
766 | some of the debug info is relative to the particular chunk of the | |
767 | section that was generated in its individual .o file. E.g. | |
768 | offsets to static variables are relative to the start of the data | |
769 | segment *for that module before linking*. This information is | |
770 | painfully squirreled away in the ELF symbol table as local symbols | |
771 | with wierd names. Go get 'em when needed. */ | |
772 | ||
773 | void | |
774 | elfstab_offset_sections (objfile, pst) | |
775 | struct objfile *objfile; | |
776 | struct partial_symtab *pst; | |
777 | { | |
778 | char *filename = pst->filename; | |
779 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
780 | struct stab_section_info *maybe = dbx->stab_section_info; | |
781 | struct stab_section_info *questionable = 0; | |
782 | int i; | |
783 | char *p; | |
784 | ||
785 | /* The ELF symbol info doesn't include path names, so strip the path | |
786 | (if any) from the psymtab filename. */ | |
787 | while (0 != (p = strchr (filename, '/'))) | |
788 | filename = p+1; | |
789 | ||
790 | /* FIXME: This linear search could speed up significantly | |
791 | if it was chained in the right order to match how we search it, | |
792 | and if we unchained when we found a match. */ | |
793 | for (; maybe; maybe = maybe->next) | |
794 | { | |
795 | if (filename[0] == maybe->filename[0] | |
796 | && STREQ (filename, maybe->filename)) | |
797 | { | |
798 | /* We found a match. But there might be several source files | |
799 | (from different directories) with the same name. */ | |
800 | if (0 == maybe->found) | |
801 | break; | |
802 | questionable = maybe; /* Might use it later. */ | |
803 | } | |
804 | } | |
805 | ||
806 | if (maybe == 0 && questionable != 0) | |
807 | { | |
808 | complain (&stab_info_questionable_complaint, filename); | |
809 | maybe = questionable; | |
810 | } | |
811 | ||
812 | if (maybe) | |
813 | { | |
814 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
815 | maybe->found++; | |
816 | pst->section_offsets = (struct section_offsets *) | |
817 | obstack_alloc (&objfile -> psymbol_obstack, | |
818 | sizeof (struct section_offsets) + | |
819 | sizeof (pst->section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
820 | ||
821 | for (i = 0; i < SECT_OFF_MAX; i++) | |
822 | ANOFFSET (pst->section_offsets, i) = maybe->sections[i]; | |
823 | return; | |
824 | } | |
825 | ||
826 | /* We were unable to find any offsets for this file. Complain. */ | |
827 | if (dbx->stab_section_info) /* If there *is* any info, */ | |
828 | complain (&stab_info_mismatch_complaint, filename); | |
829 | } | |
830 | \f | |
831 | /* Register that we are able to handle ELF object file formats. */ | |
832 | ||
833 | static struct sym_fns elf_sym_fns = | |
834 | { | |
835 | bfd_target_elf_flavour, | |
836 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
837 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
838 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
839 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
840 | default_symfile_offsets, | |
841 | /* sym_offsets: Translate ext. to int. relocation */ | |
842 | NULL /* next: pointer to next struct sym_fns */ | |
843 | }; | |
844 | ||
845 | void | |
846 | _initialize_elfread () | |
847 | { | |
848 | add_symtab_fns (&elf_sym_fns); | |
849 | } |