Commit | Line | Data |
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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 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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. | |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b JM |
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, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "bfd.h" | |
24 | #include "gdb_string.h" | |
25 | #include "elf-bfd.h" | |
26 | #include "elf/mips.h" | |
27 | #include "symtab.h" | |
28 | #include "symfile.h" | |
29 | #include "objfiles.h" | |
30 | #include "buildsym.h" | |
31 | #include "stabsread.h" | |
32 | #include "gdb-stabs.h" | |
33 | #include "complaints.h" | |
34 | #include "demangle.h" | |
35 | ||
392a587b JM |
36 | extern void _initialize_elfread PARAMS ((void)); |
37 | ||
c906108c | 38 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 39 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
40 | It's local to elf_symfile_read. */ |
41 | ||
c5aa993b JM |
42 | struct elfinfo |
43 | { | |
44 | file_ptr dboffset; /* Offset to dwarf debug section */ | |
45 | unsigned int dbsize; /* Size of dwarf debug section */ | |
46 | file_ptr lnoffset; /* Offset to dwarf line number section */ | |
47 | unsigned int lnsize; /* Size of dwarf line number section */ | |
48 | asection *stabsect; /* Section pointer for .stab section */ | |
49 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
50 | asection *mdebugsect; /* Section pointer for .mdebug section */ | |
51 | }; | |
c906108c SS |
52 | |
53 | /* Various things we might complain about... */ | |
54 | ||
c5aa993b JM |
55 | struct complaint section_info_complaint = |
56 | {"elf/stab section information %s without a preceding file symbol", 0, 0}; | |
c906108c | 57 | |
c5aa993b JM |
58 | struct complaint section_info_dup_complaint = |
59 | {"duplicated elf/stab section information for %s", 0, 0}; | |
c906108c | 60 | |
c5aa993b JM |
61 | struct complaint stab_info_mismatch_complaint = |
62 | {"elf/stab section information missing for %s", 0, 0}; | |
c906108c | 63 | |
c5aa993b JM |
64 | struct complaint stab_info_questionable_complaint = |
65 | {"elf/stab section information questionable for %s", 0, 0}; | |
c906108c SS |
66 | |
67 | static void | |
68 | elf_symfile_init PARAMS ((struct objfile *)); | |
69 | ||
70 | static void | |
71 | elf_new_init PARAMS ((struct objfile *)); | |
72 | ||
73 | static void | |
96baa820 | 74 | elf_symfile_read PARAMS ((struct objfile *, int)); |
c906108c SS |
75 | |
76 | static void | |
77 | elf_symfile_finish PARAMS ((struct objfile *)); | |
78 | ||
79 | static void | |
d4f3574e | 80 | elf_symtab_read PARAMS ((struct objfile *, int)); |
c906108c SS |
81 | |
82 | static void | |
83 | free_elfinfo PARAMS ((void *)); | |
84 | ||
85 | static struct minimal_symbol * | |
c5aa993b JM |
86 | record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR, |
87 | enum minimal_symbol_type, char *, | |
88 | asection * bfd_section, | |
89 | struct objfile *)); | |
c906108c SS |
90 | |
91 | static void | |
92 | elf_locate_sections PARAMS ((bfd *, asection *, void *)); | |
93 | ||
94 | /* We are called once per section from elf_symfile_read. We | |
95 | need to examine each section we are passed, check to see | |
96 | if it is something we are interested in processing, and | |
97 | if so, stash away some access information for the section. | |
98 | ||
99 | For now we recognize the dwarf debug information sections and | |
100 | line number sections from matching their section names. The | |
101 | ELF definition is no real help here since it has no direct | |
102 | knowledge of DWARF (by design, so any debugging format can be | |
103 | used). | |
104 | ||
105 | We also recognize the ".stab" sections used by the Sun compilers | |
106 | released with Solaris 2. | |
107 | ||
108 | FIXME: The section names should not be hardwired strings (what | |
109 | should they be? I don't think most object file formats have enough | |
110 | section flags to specify what kind of debug section it is | |
111 | -kingdon). */ | |
112 | ||
113 | static void | |
114 | elf_locate_sections (ignore_abfd, sectp, eip) | |
115 | bfd *ignore_abfd; | |
116 | asection *sectp; | |
117 | PTR eip; | |
118 | { | |
119 | register struct elfinfo *ei; | |
120 | ||
121 | ei = (struct elfinfo *) eip; | |
c5aa993b | 122 | if (STREQ (sectp->name, ".debug")) |
c906108c | 123 | { |
c5aa993b JM |
124 | ei->dboffset = sectp->filepos; |
125 | ei->dbsize = bfd_get_section_size_before_reloc (sectp); | |
c906108c | 126 | } |
c5aa993b | 127 | else if (STREQ (sectp->name, ".line")) |
c906108c | 128 | { |
c5aa993b JM |
129 | ei->lnoffset = sectp->filepos; |
130 | ei->lnsize = bfd_get_section_size_before_reloc (sectp); | |
c906108c | 131 | } |
c5aa993b | 132 | else if (STREQ (sectp->name, ".stab")) |
c906108c | 133 | { |
c5aa993b | 134 | ei->stabsect = sectp; |
c906108c | 135 | } |
c5aa993b | 136 | else if (STREQ (sectp->name, ".stab.index")) |
c906108c | 137 | { |
c5aa993b | 138 | ei->stabindexsect = sectp; |
c906108c | 139 | } |
c5aa993b | 140 | else if (STREQ (sectp->name, ".mdebug")) |
c906108c | 141 | { |
c5aa993b | 142 | ei->mdebugsect = sectp; |
c906108c SS |
143 | } |
144 | } | |
145 | ||
c5aa993b | 146 | #if 0 /* Currently unused */ |
c906108c SS |
147 | |
148 | char * | |
149 | elf_interpreter (abfd) | |
150 | bfd *abfd; | |
151 | { | |
152 | sec_ptr interp_sec; | |
153 | unsigned size; | |
154 | char *interp = NULL; | |
155 | ||
156 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
157 | if (interp_sec) | |
158 | { | |
159 | size = bfd_section_size (abfd, interp_sec); | |
160 | interp = alloca (size); | |
c5aa993b | 161 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr) 0, |
c906108c SS |
162 | size)) |
163 | { | |
164 | interp = savestring (interp, size - 1); | |
165 | } | |
166 | else | |
167 | { | |
168 | interp = NULL; | |
169 | } | |
170 | } | |
171 | return (interp); | |
172 | } | |
173 | ||
174 | #endif | |
175 | ||
176 | static struct minimal_symbol * | |
177 | record_minimal_symbol_and_info (name, address, ms_type, info, bfd_section, | |
178 | objfile) | |
179 | char *name; | |
180 | CORE_ADDR address; | |
181 | enum minimal_symbol_type ms_type; | |
182 | char *info; /* FIXME, is this really char *? */ | |
183 | asection *bfd_section; | |
184 | struct objfile *objfile; | |
185 | { | |
186 | int section; | |
187 | ||
188 | /* Guess the section from the type. This is likely to be wrong in | |
189 | some cases. */ | |
190 | switch (ms_type) | |
191 | { | |
192 | case mst_text: | |
193 | case mst_file_text: | |
194 | section = SECT_OFF_TEXT; | |
195 | #ifdef SMASH_TEXT_ADDRESS | |
196 | SMASH_TEXT_ADDRESS (address); | |
197 | #endif | |
198 | break; | |
199 | case mst_data: | |
200 | case mst_file_data: | |
201 | section = SECT_OFF_DATA; | |
202 | break; | |
203 | case mst_bss: | |
204 | case mst_file_bss: | |
205 | section = SECT_OFF_BSS; | |
206 | break; | |
207 | default: | |
208 | section = -1; | |
209 | break; | |
210 | } | |
211 | ||
212 | return prim_record_minimal_symbol_and_info | |
213 | (name, address, ms_type, info, section, bfd_section, objfile); | |
214 | } | |
215 | ||
216 | /* | |
217 | ||
c5aa993b | 218 | LOCAL FUNCTION |
c906108c | 219 | |
c5aa993b | 220 | elf_symtab_read -- read the symbol table of an ELF file |
c906108c | 221 | |
c5aa993b | 222 | SYNOPSIS |
c906108c | 223 | |
d4f3574e | 224 | void elf_symtab_read (struct objfile *objfile, int dynamic) |
c906108c | 225 | |
c5aa993b | 226 | DESCRIPTION |
c906108c | 227 | |
d4f3574e SS |
228 | Given an objfile and a flag that specifies whether or not the objfile |
229 | is for an executable or not (may be shared library for example), add | |
230 | all the global function and data symbols to the minimal symbol table. | |
c906108c | 231 | |
c5aa993b JM |
232 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
233 | defined in the ELF symbol table, which can be used to locate | |
234 | the beginnings of sections from each ".o" file that was linked to | |
235 | form the executable objfile. We gather any such info and record it | |
236 | in data structures hung off the objfile's private data. | |
c906108c | 237 | |
c5aa993b | 238 | */ |
c906108c SS |
239 | |
240 | static void | |
d4f3574e | 241 | elf_symtab_read (objfile, dynamic) |
c906108c SS |
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; | |
d4f3574e | 253 | CORE_ADDR offset; |
c906108c SS |
254 | enum minimal_symbol_type ms_type; |
255 | /* If sectinfo is nonNULL, it contains section info that should end up | |
256 | filed in the objfile. */ | |
257 | struct stab_section_info *sectinfo = NULL; | |
258 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
259 | seen any section info for it yet. */ | |
260 | asymbol *filesym = 0; | |
261 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
262 | /* Name of filesym, as saved on the symbol_obstack. */ | |
263 | char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack); | |
264 | #endif | |
265 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
266 | unsigned long size; | |
d4f3574e | 267 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
c5aa993b | 268 | |
c906108c SS |
269 | if (dynamic) |
270 | { | |
d4f3574e | 271 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
c906108c SS |
272 | |
273 | /* Nothing to be done if there is no dynamic symtab. */ | |
274 | if (storage_needed < 0) | |
275 | return; | |
276 | } | |
277 | else | |
278 | { | |
d4f3574e | 279 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
c906108c | 280 | if (storage_needed < 0) |
d4f3574e | 281 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c SS |
282 | bfd_errmsg (bfd_get_error ())); |
283 | } | |
284 | if (storage_needed > 0) | |
285 | { | |
286 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
287 | back_to = make_cleanup (free, symbol_table); | |
288 | if (dynamic) | |
d4f3574e | 289 | number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
c906108c SS |
290 | symbol_table); |
291 | else | |
d4f3574e | 292 | number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
c906108c | 293 | if (number_of_symbols < 0) |
d4f3574e | 294 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c | 295 | bfd_errmsg (bfd_get_error ())); |
fa292f23 | 296 | offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
c906108c SS |
297 | for (i = 0; i < number_of_symbols; i++) |
298 | { | |
299 | sym = symbol_table[i]; | |
c5aa993b | 300 | if (sym->name == NULL || *sym->name == '\0') |
c906108c SS |
301 | { |
302 | /* Skip names that don't exist (shouldn't happen), or names | |
c5aa993b | 303 | that are null strings (may happen). */ |
c906108c SS |
304 | continue; |
305 | } | |
306 | ||
307 | if (dynamic | |
c5aa993b JM |
308 | && sym->section == &bfd_und_section |
309 | && (sym->flags & BSF_FUNCTION)) | |
c906108c SS |
310 | { |
311 | struct minimal_symbol *msym; | |
312 | ||
313 | /* Symbol is a reference to a function defined in | |
c5aa993b JM |
314 | a shared library. |
315 | If its value is non zero then it is usually the address | |
316 | of the corresponding entry in the procedure linkage table, | |
d4f3574e | 317 | plus the desired section offset. |
c5aa993b JM |
318 | If its value is zero then the dynamic linker has to resolve |
319 | the symbol. We are unable to find any meaningful address | |
320 | for this symbol in the executable file, so we skip it. */ | |
321 | symaddr = sym->value; | |
c906108c SS |
322 | if (symaddr == 0) |
323 | continue; | |
d4f3574e | 324 | symaddr += offset; |
c906108c | 325 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
326 | ((char *) sym->name, symaddr, |
327 | mst_solib_trampoline, NULL, sym->section, objfile); | |
c906108c SS |
328 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
329 | if (msym != NULL) | |
330 | msym->filename = filesymname; | |
331 | #endif | |
332 | continue; | |
333 | } | |
334 | ||
335 | /* If it is a nonstripped executable, do not enter dynamic | |
336 | symbols, as the dynamic symbol table is usually a subset | |
337 | of the main symbol table. */ | |
338 | if (dynamic && !stripped) | |
339 | continue; | |
c5aa993b | 340 | if (sym->flags & BSF_FILE) |
c906108c SS |
341 | { |
342 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
c5aa993b | 343 | Chain any old one onto the objfile; remember new sym. */ |
c906108c SS |
344 | if (sectinfo != NULL) |
345 | { | |
c5aa993b JM |
346 | sectinfo->next = dbx->stab_section_info; |
347 | dbx->stab_section_info = sectinfo; | |
c906108c SS |
348 | sectinfo = NULL; |
349 | } | |
350 | filesym = sym; | |
351 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
352 | filesymname = | |
c5aa993b | 353 | obsavestring ((char *) filesym->name, strlen (filesym->name), |
c906108c SS |
354 | &objfile->symbol_obstack); |
355 | #endif | |
356 | } | |
c5aa993b | 357 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) |
c906108c SS |
358 | { |
359 | struct minimal_symbol *msym; | |
360 | ||
361 | /* Select global/local/weak symbols. Note that bfd puts abs | |
c5aa993b JM |
362 | symbols in their own section, so all symbols we are |
363 | interested in will have a section. */ | |
c906108c | 364 | /* Bfd symbols are section relative. */ |
c5aa993b | 365 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 366 | /* Relocate all non-absolute symbols by the section offset. */ |
c5aa993b | 367 | if (sym->section != &bfd_abs_section) |
c906108c | 368 | { |
d4f3574e | 369 | symaddr += offset; |
c906108c SS |
370 | } |
371 | /* For non-absolute symbols, use the type of the section | |
c5aa993b JM |
372 | they are relative to, to intuit text/data. Bfd provides |
373 | no way of figuring this out for absolute symbols. */ | |
374 | if (sym->section == &bfd_abs_section) | |
c906108c SS |
375 | { |
376 | /* This is a hack to get the minimal symbol type | |
11cf8741 | 377 | right for Irix 5, which has absolute addresses |
c906108c SS |
378 | with special section indices for dynamic symbols. */ |
379 | unsigned short shndx = | |
c5aa993b | 380 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
c906108c SS |
381 | |
382 | switch (shndx) | |
383 | { | |
384 | case SHN_MIPS_TEXT: | |
385 | ms_type = mst_text; | |
386 | break; | |
387 | case SHN_MIPS_DATA: | |
388 | ms_type = mst_data; | |
389 | break; | |
390 | case SHN_MIPS_ACOMMON: | |
391 | ms_type = mst_bss; | |
392 | break; | |
393 | default: | |
394 | ms_type = mst_abs; | |
395 | } | |
396 | ||
397 | /* If it is an Irix dynamic symbol, skip section name | |
d4f3574e | 398 | symbols, relocate all others by section offset. */ |
c906108c SS |
399 | if (ms_type != mst_abs) |
400 | { | |
401 | if (sym->name[0] == '.') | |
402 | continue; | |
d4f3574e | 403 | symaddr += offset; |
c906108c SS |
404 | } |
405 | } | |
c5aa993b | 406 | else if (sym->section->flags & SEC_CODE) |
c906108c | 407 | { |
c5aa993b | 408 | if (sym->flags & BSF_GLOBAL) |
c906108c SS |
409 | { |
410 | ms_type = mst_text; | |
411 | } | |
412 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') | |
c5aa993b | 413 | || ((sym->flags & BSF_LOCAL) |
c906108c SS |
414 | && sym->name[0] == '$' |
415 | && sym->name[1] == 'L')) | |
416 | /* Looks like a compiler-generated label. Skip it. | |
417 | The assembler should be skipping these (to keep | |
418 | executables small), but apparently with gcc on the | |
419 | delta m88k SVR4, it loses. So to have us check too | |
420 | should be harmless (but I encourage people to fix this | |
421 | in the assembler instead of adding checks here). */ | |
422 | continue; | |
423 | #ifdef HARRIS_TARGET | |
424 | else if (sym->name[0] == '.' && sym->name[1] == '.') | |
425 | { | |
426 | /* Looks like a Harris compiler generated label for the | |
c5aa993b JM |
427 | purpose of marking instructions that are relevant to |
428 | DWARF dies. The assembler can't get rid of these | |
429 | because they are relocatable addresses that the | |
430 | linker needs to resolve. */ | |
c906108c SS |
431 | continue; |
432 | } | |
c5aa993b | 433 | #endif |
c906108c SS |
434 | else |
435 | { | |
436 | ms_type = mst_file_text; | |
437 | } | |
438 | } | |
c5aa993b | 439 | else if (sym->section->flags & SEC_ALLOC) |
c906108c | 440 | { |
c5aa993b | 441 | if (sym->flags & BSF_GLOBAL) |
c906108c | 442 | { |
c5aa993b | 443 | if (sym->section->flags & SEC_LOAD) |
c906108c SS |
444 | { |
445 | ms_type = mst_data; | |
446 | } | |
447 | else | |
448 | { | |
449 | ms_type = mst_bss; | |
450 | } | |
451 | } | |
c5aa993b | 452 | else if (sym->flags & BSF_LOCAL) |
c906108c SS |
453 | { |
454 | /* Named Local variable in a Data section. Check its | |
c5aa993b JM |
455 | name for stabs-in-elf. The STREQ macro checks the |
456 | first character inline, so we only actually do a | |
457 | strcmp function call on names that start with 'B' | |
458 | or 'D' */ | |
c906108c | 459 | index = SECT_OFF_MAX; |
c5aa993b | 460 | if (STREQ ("Bbss.bss", sym->name)) |
c906108c SS |
461 | { |
462 | index = SECT_OFF_BSS; | |
463 | } | |
c5aa993b | 464 | else if (STREQ ("Ddata.data", sym->name)) |
c906108c SS |
465 | { |
466 | index = SECT_OFF_DATA; | |
467 | } | |
c5aa993b | 468 | else if (STREQ ("Drodata.rodata", sym->name)) |
c906108c SS |
469 | { |
470 | index = SECT_OFF_RODATA; | |
471 | } | |
472 | if (index != SECT_OFF_MAX) | |
473 | { | |
474 | /* Found a special local symbol. Allocate a | |
475 | sectinfo, if needed, and fill it in. */ | |
476 | if (sectinfo == NULL) | |
477 | { | |
478 | sectinfo = (struct stab_section_info *) | |
c5aa993b | 479 | xmmalloc (objfile->md, sizeof (*sectinfo)); |
c906108c SS |
480 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); |
481 | if (filesym == NULL) | |
482 | { | |
483 | complain (§ion_info_complaint, | |
c5aa993b | 484 | sym->name); |
c906108c SS |
485 | } |
486 | else | |
487 | { | |
c5aa993b JM |
488 | sectinfo->filename = |
489 | (char *) filesym->name; | |
c906108c SS |
490 | } |
491 | } | |
c5aa993b | 492 | if (sectinfo->sections[index] != 0) |
c906108c SS |
493 | { |
494 | complain (§ion_info_dup_complaint, | |
c5aa993b | 495 | sectinfo->filename); |
c906108c SS |
496 | } |
497 | /* Bfd symbols are section relative. */ | |
c5aa993b | 498 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 499 | /* Relocate non-absolute symbols by the section offset. */ |
c5aa993b | 500 | if (sym->section != &bfd_abs_section) |
c906108c | 501 | { |
d4f3574e | 502 | symaddr += offset; |
c906108c | 503 | } |
c5aa993b | 504 | sectinfo->sections[index] = symaddr; |
c906108c SS |
505 | /* The special local symbols don't go in the |
506 | minimal symbol table, so ignore this one. */ | |
507 | continue; | |
508 | } | |
509 | /* Not a special stabs-in-elf symbol, do regular | |
c5aa993b JM |
510 | symbol processing. */ |
511 | if (sym->section->flags & SEC_LOAD) | |
c906108c SS |
512 | { |
513 | ms_type = mst_file_data; | |
514 | } | |
515 | else | |
516 | { | |
517 | ms_type = mst_file_bss; | |
518 | } | |
519 | } | |
520 | else | |
521 | { | |
522 | ms_type = mst_unknown; | |
523 | } | |
524 | } | |
525 | else | |
526 | { | |
527 | /* FIXME: Solaris2 shared libraries include lots of | |
528 | odd "absolute" and "undefined" symbols, that play | |
529 | hob with actions like finding what function the PC | |
530 | is in. Ignore them if they aren't text, data, or bss. */ | |
531 | /* ms_type = mst_unknown; */ | |
c5aa993b | 532 | continue; /* Skip this symbol. */ |
c906108c SS |
533 | } |
534 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
c5aa993b | 535 | size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; |
c906108c | 536 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
537 | ((char *) sym->name, symaddr, |
538 | ms_type, (PTR) size, sym->section, objfile); | |
c906108c SS |
539 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
540 | if (msym != NULL) | |
541 | msym->filename = filesymname; | |
542 | #endif | |
543 | #ifdef ELF_MAKE_MSYMBOL_SPECIAL | |
c5aa993b | 544 | ELF_MAKE_MSYMBOL_SPECIAL (sym, msym); |
c906108c SS |
545 | #endif |
546 | } | |
547 | } | |
548 | do_cleanups (back_to); | |
549 | } | |
550 | } | |
551 | ||
552 | /* Scan and build partial symbols for a symbol file. | |
553 | We have been initialized by a call to elf_symfile_init, which | |
554 | currently does nothing. | |
555 | ||
556 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
557 | in each section. We simplify it down to a single offset for all | |
558 | symbols. FIXME. | |
559 | ||
560 | MAINLINE is true if we are reading the main symbol | |
561 | table (as opposed to a shared lib or dynamically loaded file). | |
562 | ||
563 | This function only does the minimum work necessary for letting the | |
564 | user "name" things symbolically; it does not read the entire symtab. | |
565 | Instead, it reads the external and static symbols and puts them in partial | |
566 | symbol tables. When more extensive information is requested of a | |
567 | file, the corresponding partial symbol table is mutated into a full | |
568 | fledged symbol table by going back and reading the symbols | |
569 | for real. | |
570 | ||
571 | We look for sections with specific names, to tell us what debug | |
572 | format to look for: FIXME!!! | |
573 | ||
574 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
575 | elfstab_build_psymtabs() handles STABS symbols; | |
576 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
577 | ||
578 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
579 | like a COFF symbol table, but has only the minimal information necessary | |
580 | for linking. We process this also, and use the information to | |
581 | build gdb's minimal symbol table. This gives us some minimal debugging | |
582 | capability even for files compiled without -g. */ | |
583 | ||
584 | static void | |
96baa820 | 585 | elf_symfile_read (objfile, mainline) |
c906108c | 586 | struct objfile *objfile; |
c906108c SS |
587 | int mainline; |
588 | { | |
589 | bfd *abfd = objfile->obfd; | |
590 | struct elfinfo ei; | |
591 | struct cleanup *back_to; | |
592 | CORE_ADDR offset; | |
593 | ||
594 | init_minimal_symbol_collection (); | |
595 | back_to = make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0); | |
596 | ||
597 | memset ((char *) &ei, 0, sizeof (ei)); | |
598 | ||
599 | /* Allocate struct to keep track of the symfile */ | |
600 | objfile->sym_stab_info = (struct dbx_symfile_info *) | |
c5aa993b | 601 | xmmalloc (objfile->md, sizeof (struct dbx_symfile_info)); |
c906108c SS |
602 | memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); |
603 | make_cleanup (free_elfinfo, (PTR) objfile); | |
604 | ||
605 | /* Process the normal ELF symbol table first. This may write some | |
606 | chain of info into the dbx_symfile_info in objfile->sym_stab_info, | |
607 | which can later be used by elfstab_offset_sections. */ | |
608 | ||
d4f3574e | 609 | elf_symtab_read (objfile, 0); |
c906108c SS |
610 | |
611 | /* Add the dynamic symbols. */ | |
612 | ||
d4f3574e | 613 | elf_symtab_read (objfile, 1); |
c906108c SS |
614 | |
615 | /* Now process debugging information, which is contained in | |
616 | special ELF sections. */ | |
617 | ||
618 | /* If we are reinitializing, or if we have never loaded syms yet, | |
619 | set table to empty. MAINLINE is cleared so that *_read_psymtab | |
620 | functions do not all also re-initialize the psymbol table. */ | |
621 | if (mainline) | |
622 | { | |
623 | init_psymbol_list (objfile, 0); | |
624 | mainline = 0; | |
625 | } | |
626 | ||
627 | /* We first have to find them... */ | |
c5aa993b | 628 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) & ei); |
c906108c SS |
629 | |
630 | /* ELF debugging information is inserted into the psymtab in the | |
631 | order of least informative first - most informative last. Since | |
632 | the psymtab table is searched `most recent insertion first' this | |
633 | increases the probability that more detailed debug information | |
634 | for a section is found. | |
635 | ||
636 | For instance, an object file might contain both .mdebug (XCOFF) | |
637 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
638 | (searched last) and DWARF2 is inserted last (searched first). If | |
639 | we don't do this then the XCOFF info is found first - for code in | |
640 | an included file XCOFF info is useless. */ | |
641 | ||
642 | if (ei.mdebugsect) | |
643 | { | |
644 | const struct ecoff_debug_swap *swap; | |
645 | ||
646 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 647 | information. */ |
c906108c SS |
648 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
649 | if (swap) | |
d4f3574e | 650 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
651 | } |
652 | if (ei.stabsect) | |
653 | { | |
654 | asection *str_sect; | |
655 | ||
656 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 657 | a separate section. */ |
c906108c SS |
658 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
659 | ||
660 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
661 | if (str_sect) | |
662 | elfstab_build_psymtabs (objfile, | |
c906108c SS |
663 | mainline, |
664 | ei.stabsect->filepos, | |
665 | bfd_section_size (abfd, ei.stabsect), | |
666 | str_sect->filepos, | |
667 | bfd_section_size (abfd, str_sect)); | |
668 | } | |
669 | if (dwarf2_has_info (abfd)) | |
670 | { | |
671 | /* DWARF 2 sections */ | |
d4f3574e | 672 | dwarf2_build_psymtabs (objfile, mainline); |
c906108c SS |
673 | } |
674 | else if (ei.dboffset && ei.lnoffset) | |
675 | { | |
676 | /* DWARF sections */ | |
677 | dwarf_build_psymtabs (objfile, | |
d4f3574e | 678 | mainline, |
c906108c SS |
679 | ei.dboffset, ei.dbsize, |
680 | ei.lnoffset, ei.lnsize); | |
681 | } | |
682 | ||
683 | /* Install any minimal symbols that have been collected as the current | |
684 | minimal symbols for this objfile. */ | |
685 | ||
686 | install_minimal_symbols (objfile); | |
687 | ||
688 | do_cleanups (back_to); | |
689 | } | |
690 | ||
691 | /* This cleans up the objfile's sym_stab_info pointer, and the chain of | |
692 | stab_section_info's, that might be dangling from it. */ | |
693 | ||
694 | static void | |
695 | free_elfinfo (objp) | |
696 | PTR objp; | |
697 | { | |
c5aa993b | 698 | struct objfile *objfile = (struct objfile *) objp; |
c906108c SS |
699 | struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; |
700 | struct stab_section_info *ssi, *nssi; | |
701 | ||
702 | ssi = dbxinfo->stab_section_info; | |
703 | while (ssi) | |
704 | { | |
705 | nssi = ssi->next; | |
706 | mfree (objfile->md, ssi); | |
707 | ssi = nssi; | |
708 | } | |
709 | ||
710 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
711 | } | |
712 | ||
713 | ||
714 | /* Initialize anything that needs initializing when a completely new symbol | |
715 | file is specified (not just adding some symbols from another file, e.g. a | |
716 | shared library). | |
717 | ||
718 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ | |
719 | ||
720 | static void | |
721 | elf_new_init (ignore) | |
722 | struct objfile *ignore; | |
723 | { | |
724 | stabsread_new_init (); | |
725 | buildsym_new_init (); | |
726 | } | |
727 | ||
728 | /* Perform any local cleanups required when we are done with a particular | |
729 | objfile. I.E, we are in the process of discarding all symbol information | |
730 | for an objfile, freeing up all memory held for it, and unlinking the | |
731 | objfile struct from the global list of known objfiles. */ | |
732 | ||
733 | static void | |
734 | elf_symfile_finish (objfile) | |
735 | struct objfile *objfile; | |
736 | { | |
c5aa993b | 737 | if (objfile->sym_stab_info != NULL) |
c906108c | 738 | { |
c5aa993b | 739 | mfree (objfile->md, objfile->sym_stab_info); |
c906108c SS |
740 | } |
741 | } | |
742 | ||
743 | /* ELF specific initialization routine for reading symbols. | |
744 | ||
745 | It is passed a pointer to a struct sym_fns which contains, among other | |
746 | things, the BFD for the file whose symbols are being read, and a slot for | |
747 | a pointer to "private data" which we can fill with goodies. | |
748 | ||
749 | For now at least, we have nothing in particular to do, so this function is | |
750 | just a stub. */ | |
751 | ||
752 | static void | |
753 | elf_symfile_init (objfile) | |
754 | struct objfile *objfile; | |
755 | { | |
756 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
757 | find this causes a significant slowdown in gdb then we could | |
758 | set it in the debug symbol readers only when necessary. */ | |
759 | objfile->flags |= OBJF_REORDERED; | |
760 | } | |
761 | ||
762 | /* When handling an ELF file that contains Sun STABS debug info, | |
763 | some of the debug info is relative to the particular chunk of the | |
764 | section that was generated in its individual .o file. E.g. | |
765 | offsets to static variables are relative to the start of the data | |
766 | segment *for that module before linking*. This information is | |
767 | painfully squirreled away in the ELF symbol table as local symbols | |
768 | with wierd names. Go get 'em when needed. */ | |
769 | ||
770 | void | |
771 | elfstab_offset_sections (objfile, pst) | |
772 | struct objfile *objfile; | |
773 | struct partial_symtab *pst; | |
774 | { | |
775 | char *filename = pst->filename; | |
776 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
777 | struct stab_section_info *maybe = dbx->stab_section_info; | |
778 | struct stab_section_info *questionable = 0; | |
779 | int i; | |
780 | char *p; | |
781 | ||
782 | /* The ELF symbol info doesn't include path names, so strip the path | |
783 | (if any) from the psymtab filename. */ | |
784 | while (0 != (p = strchr (filename, '/'))) | |
c5aa993b | 785 | filename = p + 1; |
c906108c SS |
786 | |
787 | /* FIXME: This linear search could speed up significantly | |
788 | if it was chained in the right order to match how we search it, | |
789 | and if we unchained when we found a match. */ | |
790 | for (; maybe; maybe = maybe->next) | |
791 | { | |
792 | if (filename[0] == maybe->filename[0] | |
793 | && STREQ (filename, maybe->filename)) | |
794 | { | |
795 | /* We found a match. But there might be several source files | |
796 | (from different directories) with the same name. */ | |
797 | if (0 == maybe->found) | |
798 | break; | |
c5aa993b | 799 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
800 | } |
801 | } | |
802 | ||
803 | if (maybe == 0 && questionable != 0) | |
804 | { | |
805 | complain (&stab_info_questionable_complaint, filename); | |
806 | maybe = questionable; | |
807 | } | |
808 | ||
809 | if (maybe) | |
810 | { | |
811 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
812 | maybe->found++; | |
813 | pst->section_offsets = (struct section_offsets *) | |
96baa820 | 814 | obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS); |
c906108c SS |
815 | for (i = 0; i < SECT_OFF_MAX; i++) |
816 | ANOFFSET (pst->section_offsets, i) = maybe->sections[i]; | |
817 | return; | |
818 | } | |
819 | ||
820 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 821 | if (dbx->stab_section_info) /* If there *is* any info, */ |
c906108c SS |
822 | complain (&stab_info_mismatch_complaint, filename); |
823 | } | |
824 | \f | |
825 | /* Register that we are able to handle ELF object file formats. */ | |
826 | ||
827 | static struct sym_fns elf_sym_fns = | |
828 | { | |
829 | bfd_target_elf_flavour, | |
c5aa993b JM |
830 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
831 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
832 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
833 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
96baa820 | 834 | default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
c5aa993b | 835 | NULL /* next: pointer to next struct sym_fns */ |
c906108c SS |
836 | }; |
837 | ||
838 | void | |
839 | _initialize_elfread () | |
840 | { | |
841 | add_symtab_fns (&elf_sym_fns); | |
842 | } |