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: | |
9e124216 | 194 | section = bfd_section->index; |
c906108c SS |
195 | #ifdef SMASH_TEXT_ADDRESS |
196 | SMASH_TEXT_ADDRESS (address); | |
197 | #endif | |
198 | break; | |
199 | case mst_data: | |
200 | case mst_file_data: | |
c906108c SS |
201 | case mst_bss: |
202 | case mst_file_bss: | |
9e124216 | 203 | section = bfd_section->index; |
c906108c SS |
204 | break; |
205 | default: | |
206 | section = -1; | |
207 | break; | |
208 | } | |
209 | ||
210 | return prim_record_minimal_symbol_and_info | |
211 | (name, address, ms_type, info, section, bfd_section, objfile); | |
212 | } | |
213 | ||
214 | /* | |
215 | ||
c5aa993b | 216 | LOCAL FUNCTION |
c906108c | 217 | |
c5aa993b | 218 | elf_symtab_read -- read the symbol table of an ELF file |
c906108c | 219 | |
c5aa993b | 220 | SYNOPSIS |
c906108c | 221 | |
d4f3574e | 222 | void elf_symtab_read (struct objfile *objfile, int dynamic) |
c906108c | 223 | |
c5aa993b | 224 | DESCRIPTION |
c906108c | 225 | |
d4f3574e SS |
226 | Given an objfile and a flag that specifies whether or not the objfile |
227 | is for an executable or not (may be shared library for example), add | |
228 | all the global function and data symbols to the minimal symbol table. | |
c906108c | 229 | |
c5aa993b JM |
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. | |
c906108c | 235 | |
c5aa993b | 236 | */ |
c906108c SS |
237 | |
238 | static void | |
d4f3574e | 239 | elf_symtab_read (objfile, dynamic) |
c906108c SS |
240 | struct objfile *objfile; |
241 | int dynamic; | |
242 | { | |
243 | long storage_needed; | |
244 | asymbol *sym; | |
245 | asymbol **symbol_table; | |
246 | long number_of_symbols; | |
247 | long i; | |
248 | int index; | |
249 | struct cleanup *back_to; | |
250 | CORE_ADDR symaddr; | |
d4f3574e | 251 | CORE_ADDR offset; |
c906108c SS |
252 | enum minimal_symbol_type ms_type; |
253 | /* If sectinfo is nonNULL, it contains section info that should end up | |
254 | filed in the objfile. */ | |
255 | struct stab_section_info *sectinfo = NULL; | |
256 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
257 | seen any section info for it yet. */ | |
258 | asymbol *filesym = 0; | |
259 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
260 | /* Name of filesym, as saved on the symbol_obstack. */ | |
261 | char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack); | |
262 | #endif | |
263 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
264 | unsigned long size; | |
d4f3574e | 265 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
c5aa993b | 266 | |
c906108c SS |
267 | if (dynamic) |
268 | { | |
d4f3574e | 269 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
c906108c SS |
270 | |
271 | /* Nothing to be done if there is no dynamic symtab. */ | |
272 | if (storage_needed < 0) | |
273 | return; | |
274 | } | |
275 | else | |
276 | { | |
d4f3574e | 277 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
c906108c | 278 | if (storage_needed < 0) |
d4f3574e | 279 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c SS |
280 | bfd_errmsg (bfd_get_error ())); |
281 | } | |
282 | if (storage_needed > 0) | |
283 | { | |
284 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
285 | back_to = make_cleanup (free, symbol_table); | |
286 | if (dynamic) | |
d4f3574e | 287 | number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
c906108c SS |
288 | symbol_table); |
289 | else | |
d4f3574e | 290 | number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
c906108c | 291 | if (number_of_symbols < 0) |
d4f3574e | 292 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c | 293 | bfd_errmsg (bfd_get_error ())); |
b8d39351 | 294 | |
c906108c SS |
295 | for (i = 0; i < number_of_symbols; i++) |
296 | { | |
297 | sym = symbol_table[i]; | |
c5aa993b | 298 | if (sym->name == NULL || *sym->name == '\0') |
c906108c SS |
299 | { |
300 | /* Skip names that don't exist (shouldn't happen), or names | |
c5aa993b | 301 | that are null strings (may happen). */ |
c906108c SS |
302 | continue; |
303 | } | |
304 | ||
b8d39351 | 305 | offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
c906108c | 306 | if (dynamic |
c5aa993b JM |
307 | && sym->section == &bfd_und_section |
308 | && (sym->flags & BSF_FUNCTION)) | |
c906108c SS |
309 | { |
310 | struct minimal_symbol *msym; | |
311 | ||
312 | /* Symbol is a reference to a function defined in | |
c5aa993b JM |
313 | a shared library. |
314 | If its value is non zero then it is usually the address | |
315 | of the corresponding entry in the procedure linkage table, | |
d4f3574e | 316 | plus the desired section offset. |
c5aa993b JM |
317 | If its value is zero then the dynamic linker has to resolve |
318 | the symbol. We are unable to find any meaningful address | |
319 | for this symbol in the executable file, so we skip it. */ | |
320 | symaddr = sym->value; | |
c906108c SS |
321 | if (symaddr == 0) |
322 | continue; | |
d4f3574e | 323 | symaddr += offset; |
c906108c | 324 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
325 | ((char *) sym->name, symaddr, |
326 | mst_solib_trampoline, NULL, sym->section, objfile); | |
c906108c SS |
327 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
328 | if (msym != NULL) | |
329 | msym->filename = filesymname; | |
330 | #endif | |
331 | continue; | |
332 | } | |
333 | ||
334 | /* If it is a nonstripped executable, do not enter dynamic | |
335 | symbols, as the dynamic symbol table is usually a subset | |
336 | of the main symbol table. */ | |
337 | if (dynamic && !stripped) | |
338 | continue; | |
c5aa993b | 339 | if (sym->flags & BSF_FILE) |
c906108c SS |
340 | { |
341 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
c5aa993b | 342 | Chain any old one onto the objfile; remember new sym. */ |
c906108c SS |
343 | if (sectinfo != NULL) |
344 | { | |
c5aa993b JM |
345 | sectinfo->next = dbx->stab_section_info; |
346 | dbx->stab_section_info = sectinfo; | |
c906108c SS |
347 | sectinfo = NULL; |
348 | } | |
349 | filesym = sym; | |
350 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
351 | filesymname = | |
c5aa993b | 352 | obsavestring ((char *) filesym->name, strlen (filesym->name), |
c906108c SS |
353 | &objfile->symbol_obstack); |
354 | #endif | |
355 | } | |
c5aa993b | 356 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) |
c906108c SS |
357 | { |
358 | struct minimal_symbol *msym; | |
359 | ||
360 | /* Select global/local/weak symbols. Note that bfd puts abs | |
c5aa993b JM |
361 | symbols in their own section, so all symbols we are |
362 | interested in will have a section. */ | |
c906108c | 363 | /* Bfd symbols are section relative. */ |
c5aa993b | 364 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 365 | /* Relocate all non-absolute symbols by the section offset. */ |
c5aa993b | 366 | if (sym->section != &bfd_abs_section) |
c906108c | 367 | { |
d4f3574e | 368 | symaddr += offset; |
c906108c SS |
369 | } |
370 | /* For non-absolute symbols, use the type of the section | |
c5aa993b JM |
371 | they are relative to, to intuit text/data. Bfd provides |
372 | no way of figuring this out for absolute symbols. */ | |
373 | if (sym->section == &bfd_abs_section) | |
c906108c SS |
374 | { |
375 | /* This is a hack to get the minimal symbol type | |
11cf8741 | 376 | right for Irix 5, which has absolute addresses |
c906108c SS |
377 | with special section indices for dynamic symbols. */ |
378 | unsigned short shndx = | |
c5aa993b | 379 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
c906108c SS |
380 | |
381 | switch (shndx) | |
382 | { | |
383 | case SHN_MIPS_TEXT: | |
384 | ms_type = mst_text; | |
385 | break; | |
386 | case SHN_MIPS_DATA: | |
387 | ms_type = mst_data; | |
388 | break; | |
389 | case SHN_MIPS_ACOMMON: | |
390 | ms_type = mst_bss; | |
391 | break; | |
392 | default: | |
393 | ms_type = mst_abs; | |
394 | } | |
395 | ||
396 | /* If it is an Irix dynamic symbol, skip section name | |
d4f3574e | 397 | symbols, relocate all others by section offset. */ |
c906108c SS |
398 | if (ms_type != mst_abs) |
399 | { | |
400 | if (sym->name[0] == '.') | |
401 | continue; | |
d4f3574e | 402 | symaddr += offset; |
c906108c SS |
403 | } |
404 | } | |
c5aa993b | 405 | else if (sym->section->flags & SEC_CODE) |
c906108c | 406 | { |
c5aa993b | 407 | if (sym->flags & BSF_GLOBAL) |
c906108c SS |
408 | { |
409 | ms_type = mst_text; | |
410 | } | |
411 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') | |
c5aa993b | 412 | || ((sym->flags & BSF_LOCAL) |
c906108c SS |
413 | && sym->name[0] == '$' |
414 | && sym->name[1] == 'L')) | |
415 | /* Looks like a compiler-generated label. Skip it. | |
416 | The assembler should be skipping these (to keep | |
417 | executables small), but apparently with gcc on the | |
418 | delta m88k SVR4, it loses. So to have us check too | |
419 | should be harmless (but I encourage people to fix this | |
420 | in the assembler instead of adding checks here). */ | |
421 | continue; | |
422 | #ifdef HARRIS_TARGET | |
423 | else if (sym->name[0] == '.' && sym->name[1] == '.') | |
424 | { | |
425 | /* Looks like a Harris compiler generated label for the | |
c5aa993b JM |
426 | purpose of marking instructions that are relevant to |
427 | DWARF dies. The assembler can't get rid of these | |
428 | because they are relocatable addresses that the | |
429 | linker needs to resolve. */ | |
c906108c SS |
430 | continue; |
431 | } | |
c5aa993b | 432 | #endif |
c906108c SS |
433 | else |
434 | { | |
435 | ms_type = mst_file_text; | |
436 | } | |
437 | } | |
c5aa993b | 438 | else if (sym->section->flags & SEC_ALLOC) |
c906108c | 439 | { |
c5aa993b | 440 | if (sym->flags & BSF_GLOBAL) |
c906108c | 441 | { |
c5aa993b | 442 | if (sym->section->flags & SEC_LOAD) |
c906108c SS |
443 | { |
444 | ms_type = mst_data; | |
445 | } | |
446 | else | |
447 | { | |
448 | ms_type = mst_bss; | |
449 | } | |
450 | } | |
c5aa993b | 451 | else if (sym->flags & BSF_LOCAL) |
c906108c SS |
452 | { |
453 | /* Named Local variable in a Data section. Check its | |
c5aa993b JM |
454 | name for stabs-in-elf. The STREQ macro checks the |
455 | first character inline, so we only actually do a | |
456 | strcmp function call on names that start with 'B' | |
457 | or 'D' */ | |
c906108c | 458 | index = SECT_OFF_MAX; |
c5aa993b | 459 | if (STREQ ("Bbss.bss", sym->name)) |
c906108c | 460 | { |
b8fbeb18 | 461 | index = SECT_OFF_BSS (objfile); |
c906108c | 462 | } |
c5aa993b | 463 | else if (STREQ ("Ddata.data", sym->name)) |
c906108c | 464 | { |
b8fbeb18 | 465 | index = SECT_OFF_DATA (objfile); |
c906108c | 466 | } |
c5aa993b | 467 | else if (STREQ ("Drodata.rodata", sym->name)) |
c906108c | 468 | { |
b8fbeb18 | 469 | index = SECT_OFF_RODATA (objfile); |
c906108c SS |
470 | } |
471 | if (index != SECT_OFF_MAX) | |
472 | { | |
473 | /* Found a special local symbol. Allocate a | |
474 | sectinfo, if needed, and fill it in. */ | |
475 | if (sectinfo == NULL) | |
476 | { | |
477 | sectinfo = (struct stab_section_info *) | |
c5aa993b | 478 | xmmalloc (objfile->md, sizeof (*sectinfo)); |
c906108c SS |
479 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); |
480 | if (filesym == NULL) | |
481 | { | |
482 | complain (§ion_info_complaint, | |
c5aa993b | 483 | sym->name); |
c906108c SS |
484 | } |
485 | else | |
486 | { | |
c5aa993b JM |
487 | sectinfo->filename = |
488 | (char *) filesym->name; | |
c906108c SS |
489 | } |
490 | } | |
c5aa993b | 491 | if (sectinfo->sections[index] != 0) |
c906108c SS |
492 | { |
493 | complain (§ion_info_dup_complaint, | |
c5aa993b | 494 | sectinfo->filename); |
c906108c SS |
495 | } |
496 | /* Bfd symbols are section relative. */ | |
c5aa993b | 497 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 498 | /* Relocate non-absolute symbols by the section offset. */ |
c5aa993b | 499 | if (sym->section != &bfd_abs_section) |
c906108c | 500 | { |
d4f3574e | 501 | symaddr += offset; |
c906108c | 502 | } |
c5aa993b | 503 | sectinfo->sections[index] = symaddr; |
c906108c SS |
504 | /* The special local symbols don't go in the |
505 | minimal symbol table, so ignore this one. */ | |
506 | continue; | |
507 | } | |
508 | /* Not a special stabs-in-elf symbol, do regular | |
c5aa993b JM |
509 | symbol processing. */ |
510 | if (sym->section->flags & SEC_LOAD) | |
c906108c SS |
511 | { |
512 | ms_type = mst_file_data; | |
513 | } | |
514 | else | |
515 | { | |
516 | ms_type = mst_file_bss; | |
517 | } | |
518 | } | |
519 | else | |
520 | { | |
521 | ms_type = mst_unknown; | |
522 | } | |
523 | } | |
524 | else | |
525 | { | |
526 | /* FIXME: Solaris2 shared libraries include lots of | |
527 | odd "absolute" and "undefined" symbols, that play | |
528 | hob with actions like finding what function the PC | |
529 | is in. Ignore them if they aren't text, data, or bss. */ | |
530 | /* ms_type = mst_unknown; */ | |
c5aa993b | 531 | continue; /* Skip this symbol. */ |
c906108c SS |
532 | } |
533 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
c5aa993b | 534 | size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; |
c906108c | 535 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
536 | ((char *) sym->name, symaddr, |
537 | ms_type, (PTR) size, sym->section, objfile); | |
c906108c SS |
538 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
539 | if (msym != NULL) | |
540 | msym->filename = filesymname; | |
541 | #endif | |
542 | #ifdef ELF_MAKE_MSYMBOL_SPECIAL | |
c5aa993b | 543 | ELF_MAKE_MSYMBOL_SPECIAL (sym, msym); |
c906108c SS |
544 | #endif |
545 | } | |
546 | } | |
547 | do_cleanups (back_to); | |
548 | } | |
549 | } | |
550 | ||
551 | /* Scan and build partial symbols for a symbol file. | |
552 | We have been initialized by a call to elf_symfile_init, which | |
553 | currently does nothing. | |
554 | ||
555 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
556 | in each section. We simplify it down to a single offset for all | |
557 | symbols. FIXME. | |
558 | ||
559 | MAINLINE is true if we are reading the main symbol | |
560 | table (as opposed to a shared lib or dynamically loaded file). | |
561 | ||
562 | This function only does the minimum work necessary for letting the | |
563 | user "name" things symbolically; it does not read the entire symtab. | |
564 | Instead, it reads the external and static symbols and puts them in partial | |
565 | symbol tables. When more extensive information is requested of a | |
566 | file, the corresponding partial symbol table is mutated into a full | |
567 | fledged symbol table by going back and reading the symbols | |
568 | for real. | |
569 | ||
570 | We look for sections with specific names, to tell us what debug | |
571 | format to look for: FIXME!!! | |
572 | ||
573 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
574 | elfstab_build_psymtabs() handles STABS symbols; | |
575 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
576 | ||
577 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
578 | like a COFF symbol table, but has only the minimal information necessary | |
579 | for linking. We process this also, and use the information to | |
580 | build gdb's minimal symbol table. This gives us some minimal debugging | |
581 | capability even for files compiled without -g. */ | |
582 | ||
583 | static void | |
96baa820 | 584 | elf_symfile_read (objfile, mainline) |
c906108c | 585 | struct objfile *objfile; |
c906108c SS |
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 (); | |
56e290f4 | 594 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
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 *) | |
c5aa993b | 600 | xmmalloc (objfile->md, sizeof (struct dbx_symfile_info)); |
c906108c SS |
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 | ||
d4f3574e | 608 | elf_symtab_read (objfile, 0); |
c906108c SS |
609 | |
610 | /* Add the dynamic symbols. */ | |
611 | ||
d4f3574e | 612 | elf_symtab_read (objfile, 1); |
c906108c SS |
613 | |
614 | /* Now process debugging information, which is contained in | |
615 | special ELF sections. */ | |
616 | ||
617 | /* If we are reinitializing, or if we have never loaded syms yet, | |
618 | set table to empty. MAINLINE is cleared so that *_read_psymtab | |
619 | functions do not all also re-initialize the psymbol table. */ | |
620 | if (mainline) | |
621 | { | |
622 | init_psymbol_list (objfile, 0); | |
623 | mainline = 0; | |
624 | } | |
625 | ||
626 | /* We first have to find them... */ | |
c5aa993b | 627 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) & ei); |
c906108c SS |
628 | |
629 | /* ELF debugging information is inserted into the psymtab in the | |
630 | order of least informative first - most informative last. Since | |
631 | the psymtab table is searched `most recent insertion first' this | |
632 | increases the probability that more detailed debug information | |
633 | for a section is found. | |
634 | ||
635 | For instance, an object file might contain both .mdebug (XCOFF) | |
636 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
637 | (searched last) and DWARF2 is inserted last (searched first). If | |
638 | we don't do this then the XCOFF info is found first - for code in | |
639 | an included file XCOFF info is useless. */ | |
640 | ||
641 | if (ei.mdebugsect) | |
642 | { | |
643 | const struct ecoff_debug_swap *swap; | |
644 | ||
645 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 646 | information. */ |
c906108c SS |
647 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
648 | if (swap) | |
d4f3574e | 649 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
650 | } |
651 | if (ei.stabsect) | |
652 | { | |
653 | asection *str_sect; | |
654 | ||
655 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 656 | a separate section. */ |
c906108c SS |
657 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
658 | ||
659 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
660 | if (str_sect) | |
661 | elfstab_build_psymtabs (objfile, | |
c906108c SS |
662 | mainline, |
663 | ei.stabsect->filepos, | |
664 | bfd_section_size (abfd, ei.stabsect), | |
665 | str_sect->filepos, | |
666 | bfd_section_size (abfd, str_sect)); | |
667 | } | |
668 | if (dwarf2_has_info (abfd)) | |
669 | { | |
670 | /* DWARF 2 sections */ | |
d4f3574e | 671 | dwarf2_build_psymtabs (objfile, mainline); |
c906108c SS |
672 | } |
673 | else if (ei.dboffset && ei.lnoffset) | |
674 | { | |
675 | /* DWARF sections */ | |
676 | dwarf_build_psymtabs (objfile, | |
d4f3574e | 677 | mainline, |
c906108c SS |
678 | ei.dboffset, ei.dbsize, |
679 | ei.lnoffset, ei.lnsize); | |
680 | } | |
681 | ||
682 | /* Install any minimal symbols that have been collected as the current | |
683 | minimal symbols for this objfile. */ | |
684 | ||
685 | install_minimal_symbols (objfile); | |
686 | ||
687 | do_cleanups (back_to); | |
688 | } | |
689 | ||
690 | /* This cleans up the objfile's sym_stab_info pointer, and the chain of | |
691 | stab_section_info's, that might be dangling from it. */ | |
692 | ||
693 | static void | |
694 | free_elfinfo (objp) | |
695 | PTR objp; | |
696 | { | |
c5aa993b | 697 | struct objfile *objfile = (struct objfile *) objp; |
c906108c SS |
698 | struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; |
699 | struct stab_section_info *ssi, *nssi; | |
700 | ||
701 | ssi = dbxinfo->stab_section_info; | |
702 | while (ssi) | |
703 | { | |
704 | nssi = ssi->next; | |
705 | mfree (objfile->md, ssi); | |
706 | ssi = nssi; | |
707 | } | |
708 | ||
709 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
710 | } | |
711 | ||
712 | ||
713 | /* Initialize anything that needs initializing when a completely new symbol | |
714 | file is specified (not just adding some symbols from another file, e.g. a | |
715 | shared library). | |
716 | ||
717 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ | |
718 | ||
719 | static void | |
720 | elf_new_init (ignore) | |
721 | struct objfile *ignore; | |
722 | { | |
723 | stabsread_new_init (); | |
724 | buildsym_new_init (); | |
725 | } | |
726 | ||
727 | /* Perform any local cleanups required when we are done with a particular | |
728 | objfile. I.E, we are in the process of discarding all symbol information | |
729 | for an objfile, freeing up all memory held for it, and unlinking the | |
730 | objfile struct from the global list of known objfiles. */ | |
731 | ||
732 | static void | |
733 | elf_symfile_finish (objfile) | |
734 | struct objfile *objfile; | |
735 | { | |
c5aa993b | 736 | if (objfile->sym_stab_info != NULL) |
c906108c | 737 | { |
c5aa993b | 738 | mfree (objfile->md, objfile->sym_stab_info); |
c906108c SS |
739 | } |
740 | } | |
741 | ||
742 | /* ELF specific initialization routine for reading symbols. | |
743 | ||
744 | It is passed a pointer to a struct sym_fns which contains, among other | |
745 | things, the BFD for the file whose symbols are being read, and a slot for | |
746 | a pointer to "private data" which we can fill with goodies. | |
747 | ||
748 | For now at least, we have nothing in particular to do, so this function is | |
749 | just a stub. */ | |
750 | ||
751 | static void | |
752 | elf_symfile_init (objfile) | |
753 | struct objfile *objfile; | |
754 | { | |
755 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
756 | find this causes a significant slowdown in gdb then we could | |
757 | set it in the debug symbol readers only when necessary. */ | |
758 | objfile->flags |= OBJF_REORDERED; | |
759 | } | |
760 | ||
761 | /* When handling an ELF file that contains Sun STABS debug info, | |
762 | some of the debug info is relative to the particular chunk of the | |
763 | section that was generated in its individual .o file. E.g. | |
764 | offsets to static variables are relative to the start of the data | |
765 | segment *for that module before linking*. This information is | |
766 | painfully squirreled away in the ELF symbol table as local symbols | |
767 | with wierd names. Go get 'em when needed. */ | |
768 | ||
769 | void | |
770 | elfstab_offset_sections (objfile, pst) | |
771 | struct objfile *objfile; | |
772 | struct partial_symtab *pst; | |
773 | { | |
774 | char *filename = pst->filename; | |
775 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
776 | struct stab_section_info *maybe = dbx->stab_section_info; | |
777 | struct stab_section_info *questionable = 0; | |
778 | int i; | |
779 | char *p; | |
780 | ||
781 | /* The ELF symbol info doesn't include path names, so strip the path | |
782 | (if any) from the psymtab filename. */ | |
783 | while (0 != (p = strchr (filename, '/'))) | |
c5aa993b | 784 | filename = p + 1; |
c906108c SS |
785 | |
786 | /* FIXME: This linear search could speed up significantly | |
787 | if it was chained in the right order to match how we search it, | |
788 | and if we unchained when we found a match. */ | |
789 | for (; maybe; maybe = maybe->next) | |
790 | { | |
791 | if (filename[0] == maybe->filename[0] | |
792 | && STREQ (filename, maybe->filename)) | |
793 | { | |
794 | /* We found a match. But there might be several source files | |
795 | (from different directories) with the same name. */ | |
796 | if (0 == maybe->found) | |
797 | break; | |
c5aa993b | 798 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
799 | } |
800 | } | |
801 | ||
802 | if (maybe == 0 && questionable != 0) | |
803 | { | |
804 | complain (&stab_info_questionable_complaint, filename); | |
805 | maybe = questionable; | |
806 | } | |
807 | ||
808 | if (maybe) | |
809 | { | |
810 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
811 | maybe->found++; | |
812 | pst->section_offsets = (struct section_offsets *) | |
96baa820 | 813 | obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS); |
c906108c SS |
814 | for (i = 0; i < SECT_OFF_MAX; i++) |
815 | ANOFFSET (pst->section_offsets, i) = maybe->sections[i]; | |
816 | return; | |
817 | } | |
818 | ||
819 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 820 | if (dbx->stab_section_info) /* If there *is* any info, */ |
c906108c SS |
821 | complain (&stab_info_mismatch_complaint, filename); |
822 | } | |
823 | \f | |
824 | /* Register that we are able to handle ELF object file formats. */ | |
825 | ||
826 | static struct sym_fns elf_sym_fns = | |
827 | { | |
828 | bfd_target_elf_flavour, | |
c5aa993b JM |
829 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
830 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
831 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
832 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
96baa820 | 833 | default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
c5aa993b | 834 | NULL /* next: pointer to next struct sym_fns */ |
c906108c SS |
835 | }; |
836 | ||
837 | void | |
838 | _initialize_elfread () | |
839 | { | |
840 | add_symtab_fns (&elf_sym_fns); | |
841 | } |