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 | ||
a14ed312 | 36 | extern void _initialize_elfread (void); |
392a587b | 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 | 66 | |
a14ed312 | 67 | static void elf_symfile_init (struct objfile *); |
c906108c | 68 | |
a14ed312 | 69 | static void elf_new_init (struct objfile *); |
c906108c | 70 | |
a14ed312 | 71 | static void elf_symfile_read (struct objfile *, int); |
c906108c | 72 | |
a14ed312 | 73 | static void elf_symfile_finish (struct objfile *); |
c906108c | 74 | |
a14ed312 | 75 | static void elf_symtab_read (struct objfile *, int); |
c906108c | 76 | |
a14ed312 | 77 | static void free_elfinfo (void *); |
c906108c | 78 | |
a14ed312 KB |
79 | static struct minimal_symbol *record_minimal_symbol_and_info (char *, |
80 | CORE_ADDR, | |
81 | enum | |
82 | minimal_symbol_type, | |
83 | char *, | |
84 | asection * | |
85 | bfd_section, | |
86 | struct objfile | |
87 | *); | |
c906108c | 88 | |
a14ed312 | 89 | static void elf_locate_sections (bfd *, asection *, void *); |
c906108c SS |
90 | |
91 | /* We are called once per section from elf_symfile_read. We | |
92 | need to examine each section we are passed, check to see | |
93 | if it is something we are interested in processing, and | |
94 | if so, stash away some access information for the section. | |
95 | ||
96 | For now we recognize the dwarf debug information sections and | |
97 | line number sections from matching their section names. The | |
98 | ELF definition is no real help here since it has no direct | |
99 | knowledge of DWARF (by design, so any debugging format can be | |
100 | used). | |
101 | ||
102 | We also recognize the ".stab" sections used by the Sun compilers | |
103 | released with Solaris 2. | |
104 | ||
105 | FIXME: The section names should not be hardwired strings (what | |
106 | should they be? I don't think most object file formats have enough | |
107 | section flags to specify what kind of debug section it is | |
108 | -kingdon). */ | |
109 | ||
110 | static void | |
fba45db2 | 111 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, PTR eip) |
c906108c SS |
112 | { |
113 | register struct elfinfo *ei; | |
114 | ||
115 | ei = (struct elfinfo *) eip; | |
c5aa993b | 116 | if (STREQ (sectp->name, ".debug")) |
c906108c | 117 | { |
c5aa993b JM |
118 | ei->dboffset = sectp->filepos; |
119 | ei->dbsize = bfd_get_section_size_before_reloc (sectp); | |
c906108c | 120 | } |
c5aa993b | 121 | else if (STREQ (sectp->name, ".line")) |
c906108c | 122 | { |
c5aa993b JM |
123 | ei->lnoffset = sectp->filepos; |
124 | ei->lnsize = bfd_get_section_size_before_reloc (sectp); | |
c906108c | 125 | } |
c5aa993b | 126 | else if (STREQ (sectp->name, ".stab")) |
c906108c | 127 | { |
c5aa993b | 128 | ei->stabsect = sectp; |
c906108c | 129 | } |
c5aa993b | 130 | else if (STREQ (sectp->name, ".stab.index")) |
c906108c | 131 | { |
c5aa993b | 132 | ei->stabindexsect = sectp; |
c906108c | 133 | } |
c5aa993b | 134 | else if (STREQ (sectp->name, ".mdebug")) |
c906108c | 135 | { |
c5aa993b | 136 | ei->mdebugsect = sectp; |
c906108c SS |
137 | } |
138 | } | |
139 | ||
c5aa993b | 140 | #if 0 /* Currently unused */ |
c906108c SS |
141 | |
142 | char * | |
fba45db2 | 143 | elf_interpreter (bfd *abfd) |
c906108c SS |
144 | { |
145 | sec_ptr interp_sec; | |
146 | unsigned size; | |
147 | char *interp = NULL; | |
148 | ||
149 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
150 | if (interp_sec) | |
151 | { | |
152 | size = bfd_section_size (abfd, interp_sec); | |
153 | interp = alloca (size); | |
c5aa993b | 154 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr) 0, |
c906108c SS |
155 | size)) |
156 | { | |
157 | interp = savestring (interp, size - 1); | |
158 | } | |
159 | else | |
160 | { | |
161 | interp = NULL; | |
162 | } | |
163 | } | |
164 | return (interp); | |
165 | } | |
166 | ||
167 | #endif | |
168 | ||
169 | static struct minimal_symbol * | |
fba45db2 KB |
170 | record_minimal_symbol_and_info (char *name, CORE_ADDR address, |
171 | enum minimal_symbol_type ms_type, char *info, /* FIXME, is this really char *? */ | |
172 | asection *bfd_section, struct objfile *objfile) | |
c906108c SS |
173 | { |
174 | int section; | |
175 | ||
176 | /* Guess the section from the type. This is likely to be wrong in | |
177 | some cases. */ | |
178 | switch (ms_type) | |
179 | { | |
180 | case mst_text: | |
181 | case mst_file_text: | |
9e124216 | 182 | section = bfd_section->index; |
c906108c SS |
183 | #ifdef SMASH_TEXT_ADDRESS |
184 | SMASH_TEXT_ADDRESS (address); | |
185 | #endif | |
186 | break; | |
187 | case mst_data: | |
188 | case mst_file_data: | |
c906108c SS |
189 | case mst_bss: |
190 | case mst_file_bss: | |
9e124216 | 191 | section = bfd_section->index; |
c906108c SS |
192 | break; |
193 | default: | |
194 | section = -1; | |
195 | break; | |
196 | } | |
197 | ||
198 | return prim_record_minimal_symbol_and_info | |
199 | (name, address, ms_type, info, section, bfd_section, objfile); | |
200 | } | |
201 | ||
202 | /* | |
203 | ||
c5aa993b | 204 | LOCAL FUNCTION |
c906108c | 205 | |
c5aa993b | 206 | elf_symtab_read -- read the symbol table of an ELF file |
c906108c | 207 | |
c5aa993b | 208 | SYNOPSIS |
c906108c | 209 | |
d4f3574e | 210 | void elf_symtab_read (struct objfile *objfile, int dynamic) |
c906108c | 211 | |
c5aa993b | 212 | DESCRIPTION |
c906108c | 213 | |
d4f3574e SS |
214 | Given an objfile and a flag that specifies whether or not the objfile |
215 | is for an executable or not (may be shared library for example), add | |
216 | all the global function and data symbols to the minimal symbol table. | |
c906108c | 217 | |
c5aa993b JM |
218 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
219 | defined in the ELF symbol table, which can be used to locate | |
220 | the beginnings of sections from each ".o" file that was linked to | |
221 | form the executable objfile. We gather any such info and record it | |
222 | in data structures hung off the objfile's private data. | |
c906108c | 223 | |
c5aa993b | 224 | */ |
c906108c SS |
225 | |
226 | static void | |
fba45db2 | 227 | elf_symtab_read (struct objfile *objfile, int dynamic) |
c906108c SS |
228 | { |
229 | long storage_needed; | |
230 | asymbol *sym; | |
231 | asymbol **symbol_table; | |
232 | long number_of_symbols; | |
233 | long i; | |
234 | int index; | |
235 | struct cleanup *back_to; | |
236 | CORE_ADDR symaddr; | |
d4f3574e | 237 | CORE_ADDR offset; |
c906108c SS |
238 | enum minimal_symbol_type ms_type; |
239 | /* If sectinfo is nonNULL, it contains section info that should end up | |
240 | filed in the objfile. */ | |
241 | struct stab_section_info *sectinfo = NULL; | |
242 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
243 | seen any section info for it yet. */ | |
244 | asymbol *filesym = 0; | |
245 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
246 | /* Name of filesym, as saved on the symbol_obstack. */ | |
247 | char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack); | |
248 | #endif | |
249 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
250 | unsigned long size; | |
d4f3574e | 251 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
c5aa993b | 252 | |
c906108c SS |
253 | if (dynamic) |
254 | { | |
d4f3574e | 255 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
c906108c SS |
256 | |
257 | /* Nothing to be done if there is no dynamic symtab. */ | |
258 | if (storage_needed < 0) | |
259 | return; | |
260 | } | |
261 | else | |
262 | { | |
d4f3574e | 263 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
c906108c | 264 | if (storage_needed < 0) |
d4f3574e | 265 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c SS |
266 | bfd_errmsg (bfd_get_error ())); |
267 | } | |
268 | if (storage_needed > 0) | |
269 | { | |
270 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
271 | back_to = make_cleanup (free, symbol_table); | |
272 | if (dynamic) | |
d4f3574e | 273 | number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
c906108c SS |
274 | symbol_table); |
275 | else | |
d4f3574e | 276 | number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
c906108c | 277 | if (number_of_symbols < 0) |
d4f3574e | 278 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c | 279 | bfd_errmsg (bfd_get_error ())); |
b8d39351 | 280 | |
c906108c SS |
281 | for (i = 0; i < number_of_symbols; i++) |
282 | { | |
283 | sym = symbol_table[i]; | |
c5aa993b | 284 | if (sym->name == NULL || *sym->name == '\0') |
c906108c SS |
285 | { |
286 | /* Skip names that don't exist (shouldn't happen), or names | |
c5aa993b | 287 | that are null strings (may happen). */ |
c906108c SS |
288 | continue; |
289 | } | |
290 | ||
b8d39351 | 291 | offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
c906108c | 292 | if (dynamic |
c5aa993b JM |
293 | && sym->section == &bfd_und_section |
294 | && (sym->flags & BSF_FUNCTION)) | |
c906108c SS |
295 | { |
296 | struct minimal_symbol *msym; | |
297 | ||
298 | /* Symbol is a reference to a function defined in | |
c5aa993b JM |
299 | a shared library. |
300 | If its value is non zero then it is usually the address | |
301 | of the corresponding entry in the procedure linkage table, | |
d4f3574e | 302 | plus the desired section offset. |
c5aa993b JM |
303 | If its value is zero then the dynamic linker has to resolve |
304 | the symbol. We are unable to find any meaningful address | |
305 | for this symbol in the executable file, so we skip it. */ | |
306 | symaddr = sym->value; | |
c906108c SS |
307 | if (symaddr == 0) |
308 | continue; | |
d4f3574e | 309 | symaddr += offset; |
c906108c | 310 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
311 | ((char *) sym->name, symaddr, |
312 | mst_solib_trampoline, NULL, sym->section, objfile); | |
c906108c SS |
313 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
314 | if (msym != NULL) | |
315 | msym->filename = filesymname; | |
316 | #endif | |
317 | continue; | |
318 | } | |
319 | ||
320 | /* If it is a nonstripped executable, do not enter dynamic | |
321 | symbols, as the dynamic symbol table is usually a subset | |
322 | of the main symbol table. */ | |
323 | if (dynamic && !stripped) | |
324 | continue; | |
c5aa993b | 325 | if (sym->flags & BSF_FILE) |
c906108c SS |
326 | { |
327 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
c5aa993b | 328 | Chain any old one onto the objfile; remember new sym. */ |
c906108c SS |
329 | if (sectinfo != NULL) |
330 | { | |
c5aa993b JM |
331 | sectinfo->next = dbx->stab_section_info; |
332 | dbx->stab_section_info = sectinfo; | |
c906108c SS |
333 | sectinfo = NULL; |
334 | } | |
335 | filesym = sym; | |
336 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
337 | filesymname = | |
c5aa993b | 338 | obsavestring ((char *) filesym->name, strlen (filesym->name), |
c906108c SS |
339 | &objfile->symbol_obstack); |
340 | #endif | |
341 | } | |
c5aa993b | 342 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) |
c906108c SS |
343 | { |
344 | struct minimal_symbol *msym; | |
345 | ||
346 | /* Select global/local/weak symbols. Note that bfd puts abs | |
c5aa993b JM |
347 | symbols in their own section, so all symbols we are |
348 | interested in will have a section. */ | |
c906108c | 349 | /* Bfd symbols are section relative. */ |
c5aa993b | 350 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 351 | /* Relocate all non-absolute symbols by the section offset. */ |
c5aa993b | 352 | if (sym->section != &bfd_abs_section) |
c906108c | 353 | { |
d4f3574e | 354 | symaddr += offset; |
c906108c SS |
355 | } |
356 | /* For non-absolute symbols, use the type of the section | |
c5aa993b JM |
357 | they are relative to, to intuit text/data. Bfd provides |
358 | no way of figuring this out for absolute symbols. */ | |
359 | if (sym->section == &bfd_abs_section) | |
c906108c SS |
360 | { |
361 | /* This is a hack to get the minimal symbol type | |
11cf8741 | 362 | right for Irix 5, which has absolute addresses |
c906108c SS |
363 | with special section indices for dynamic symbols. */ |
364 | unsigned short shndx = | |
c5aa993b | 365 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
c906108c SS |
366 | |
367 | switch (shndx) | |
368 | { | |
369 | case SHN_MIPS_TEXT: | |
370 | ms_type = mst_text; | |
371 | break; | |
372 | case SHN_MIPS_DATA: | |
373 | ms_type = mst_data; | |
374 | break; | |
375 | case SHN_MIPS_ACOMMON: | |
376 | ms_type = mst_bss; | |
377 | break; | |
378 | default: | |
379 | ms_type = mst_abs; | |
380 | } | |
381 | ||
382 | /* If it is an Irix dynamic symbol, skip section name | |
d4f3574e | 383 | symbols, relocate all others by section offset. */ |
c906108c SS |
384 | if (ms_type != mst_abs) |
385 | { | |
386 | if (sym->name[0] == '.') | |
387 | continue; | |
d4f3574e | 388 | symaddr += offset; |
c906108c SS |
389 | } |
390 | } | |
c5aa993b | 391 | else if (sym->section->flags & SEC_CODE) |
c906108c | 392 | { |
c5aa993b | 393 | if (sym->flags & BSF_GLOBAL) |
c906108c SS |
394 | { |
395 | ms_type = mst_text; | |
396 | } | |
397 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') | |
c5aa993b | 398 | || ((sym->flags & BSF_LOCAL) |
c906108c SS |
399 | && sym->name[0] == '$' |
400 | && sym->name[1] == 'L')) | |
401 | /* Looks like a compiler-generated label. Skip it. | |
402 | The assembler should be skipping these (to keep | |
403 | executables small), but apparently with gcc on the | |
404 | delta m88k SVR4, it loses. So to have us check too | |
405 | should be harmless (but I encourage people to fix this | |
406 | in the assembler instead of adding checks here). */ | |
407 | continue; | |
408 | #ifdef HARRIS_TARGET | |
409 | else if (sym->name[0] == '.' && sym->name[1] == '.') | |
410 | { | |
411 | /* Looks like a Harris compiler generated label for the | |
c5aa993b JM |
412 | purpose of marking instructions that are relevant to |
413 | DWARF dies. The assembler can't get rid of these | |
414 | because they are relocatable addresses that the | |
415 | linker needs to resolve. */ | |
c906108c SS |
416 | continue; |
417 | } | |
c5aa993b | 418 | #endif |
c906108c SS |
419 | else |
420 | { | |
421 | ms_type = mst_file_text; | |
422 | } | |
423 | } | |
c5aa993b | 424 | else if (sym->section->flags & SEC_ALLOC) |
c906108c | 425 | { |
c5aa993b | 426 | if (sym->flags & BSF_GLOBAL) |
c906108c | 427 | { |
c5aa993b | 428 | if (sym->section->flags & SEC_LOAD) |
c906108c SS |
429 | { |
430 | ms_type = mst_data; | |
431 | } | |
432 | else | |
433 | { | |
434 | ms_type = mst_bss; | |
435 | } | |
436 | } | |
c5aa993b | 437 | else if (sym->flags & BSF_LOCAL) |
c906108c SS |
438 | { |
439 | /* Named Local variable in a Data section. Check its | |
c5aa993b JM |
440 | name for stabs-in-elf. The STREQ macro checks the |
441 | first character inline, so we only actually do a | |
442 | strcmp function call on names that start with 'B' | |
443 | or 'D' */ | |
c906108c | 444 | index = SECT_OFF_MAX; |
c5aa993b | 445 | if (STREQ ("Bbss.bss", sym->name)) |
c906108c | 446 | { |
b8fbeb18 | 447 | index = SECT_OFF_BSS (objfile); |
c906108c | 448 | } |
c5aa993b | 449 | else if (STREQ ("Ddata.data", sym->name)) |
c906108c | 450 | { |
b8fbeb18 | 451 | index = SECT_OFF_DATA (objfile); |
c906108c | 452 | } |
c5aa993b | 453 | else if (STREQ ("Drodata.rodata", sym->name)) |
c906108c | 454 | { |
b8fbeb18 | 455 | index = SECT_OFF_RODATA (objfile); |
c906108c SS |
456 | } |
457 | if (index != SECT_OFF_MAX) | |
458 | { | |
459 | /* Found a special local symbol. Allocate a | |
460 | sectinfo, if needed, and fill it in. */ | |
461 | if (sectinfo == NULL) | |
462 | { | |
463 | sectinfo = (struct stab_section_info *) | |
c5aa993b | 464 | xmmalloc (objfile->md, sizeof (*sectinfo)); |
c906108c SS |
465 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); |
466 | if (filesym == NULL) | |
467 | { | |
468 | complain (§ion_info_complaint, | |
c5aa993b | 469 | sym->name); |
c906108c SS |
470 | } |
471 | else | |
472 | { | |
c5aa993b JM |
473 | sectinfo->filename = |
474 | (char *) filesym->name; | |
c906108c SS |
475 | } |
476 | } | |
a4c8257b EZ |
477 | if (index != -1) |
478 | { | |
479 | if (sectinfo->sections[index] != 0) | |
480 | { | |
481 | complain (§ion_info_dup_complaint, | |
482 | sectinfo->filename); | |
483 | } | |
c906108c | 484 | } |
a4c8257b EZ |
485 | else |
486 | internal_error ("Section index uninitialized."); | |
c906108c | 487 | /* Bfd symbols are section relative. */ |
c5aa993b | 488 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 489 | /* Relocate non-absolute symbols by the section offset. */ |
c5aa993b | 490 | if (sym->section != &bfd_abs_section) |
c906108c | 491 | { |
d4f3574e | 492 | symaddr += offset; |
c906108c | 493 | } |
a4c8257b EZ |
494 | if (index != -1) |
495 | sectinfo->sections[index] = symaddr; | |
496 | else | |
497 | internal_error ("Section index uninitialized."); | |
c906108c SS |
498 | /* The special local symbols don't go in the |
499 | minimal symbol table, so ignore this one. */ | |
500 | continue; | |
501 | } | |
502 | /* Not a special stabs-in-elf symbol, do regular | |
c5aa993b JM |
503 | symbol processing. */ |
504 | if (sym->section->flags & SEC_LOAD) | |
c906108c SS |
505 | { |
506 | ms_type = mst_file_data; | |
507 | } | |
508 | else | |
509 | { | |
510 | ms_type = mst_file_bss; | |
511 | } | |
512 | } | |
513 | else | |
514 | { | |
515 | ms_type = mst_unknown; | |
516 | } | |
517 | } | |
518 | else | |
519 | { | |
520 | /* FIXME: Solaris2 shared libraries include lots of | |
521 | odd "absolute" and "undefined" symbols, that play | |
522 | hob with actions like finding what function the PC | |
523 | is in. Ignore them if they aren't text, data, or bss. */ | |
524 | /* ms_type = mst_unknown; */ | |
c5aa993b | 525 | continue; /* Skip this symbol. */ |
c906108c SS |
526 | } |
527 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
c5aa993b | 528 | size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; |
c906108c | 529 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
530 | ((char *) sym->name, symaddr, |
531 | ms_type, (PTR) size, sym->section, objfile); | |
c906108c SS |
532 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
533 | if (msym != NULL) | |
534 | msym->filename = filesymname; | |
535 | #endif | |
536 | #ifdef ELF_MAKE_MSYMBOL_SPECIAL | |
c5aa993b | 537 | ELF_MAKE_MSYMBOL_SPECIAL (sym, msym); |
c906108c SS |
538 | #endif |
539 | } | |
540 | } | |
541 | do_cleanups (back_to); | |
542 | } | |
543 | } | |
544 | ||
545 | /* Scan and build partial symbols for a symbol file. | |
546 | We have been initialized by a call to elf_symfile_init, which | |
547 | currently does nothing. | |
548 | ||
549 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
550 | in each section. We simplify it down to a single offset for all | |
551 | symbols. FIXME. | |
552 | ||
553 | MAINLINE is true if we are reading the main symbol | |
554 | table (as opposed to a shared lib or dynamically loaded file). | |
555 | ||
556 | This function only does the minimum work necessary for letting the | |
557 | user "name" things symbolically; it does not read the entire symtab. | |
558 | Instead, it reads the external and static symbols and puts them in partial | |
559 | symbol tables. When more extensive information is requested of a | |
560 | file, the corresponding partial symbol table is mutated into a full | |
561 | fledged symbol table by going back and reading the symbols | |
562 | for real. | |
563 | ||
564 | We look for sections with specific names, to tell us what debug | |
565 | format to look for: FIXME!!! | |
566 | ||
567 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
568 | elfstab_build_psymtabs() handles STABS symbols; | |
569 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
570 | ||
571 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
572 | like a COFF symbol table, but has only the minimal information necessary | |
573 | for linking. We process this also, and use the information to | |
574 | build gdb's minimal symbol table. This gives us some minimal debugging | |
575 | capability even for files compiled without -g. */ | |
576 | ||
577 | static void | |
fba45db2 | 578 | elf_symfile_read (struct objfile *objfile, int mainline) |
c906108c SS |
579 | { |
580 | bfd *abfd = objfile->obfd; | |
581 | struct elfinfo ei; | |
582 | struct cleanup *back_to; | |
583 | CORE_ADDR offset; | |
584 | ||
585 | init_minimal_symbol_collection (); | |
56e290f4 | 586 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
587 | |
588 | memset ((char *) &ei, 0, sizeof (ei)); | |
589 | ||
590 | /* Allocate struct to keep track of the symfile */ | |
591 | objfile->sym_stab_info = (struct dbx_symfile_info *) | |
c5aa993b | 592 | xmmalloc (objfile->md, sizeof (struct dbx_symfile_info)); |
c906108c SS |
593 | memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); |
594 | make_cleanup (free_elfinfo, (PTR) objfile); | |
595 | ||
596 | /* Process the normal ELF symbol table first. This may write some | |
597 | chain of info into the dbx_symfile_info in objfile->sym_stab_info, | |
598 | which can later be used by elfstab_offset_sections. */ | |
599 | ||
d4f3574e | 600 | elf_symtab_read (objfile, 0); |
c906108c SS |
601 | |
602 | /* Add the dynamic symbols. */ | |
603 | ||
d4f3574e | 604 | elf_symtab_read (objfile, 1); |
c906108c SS |
605 | |
606 | /* Now process debugging information, which is contained in | |
607 | special ELF sections. */ | |
608 | ||
609 | /* If we are reinitializing, or if we have never loaded syms yet, | |
610 | set table to empty. MAINLINE is cleared so that *_read_psymtab | |
611 | functions do not all also re-initialize the psymbol table. */ | |
612 | if (mainline) | |
613 | { | |
614 | init_psymbol_list (objfile, 0); | |
615 | mainline = 0; | |
616 | } | |
617 | ||
618 | /* We first have to find them... */ | |
c5aa993b | 619 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) & ei); |
c906108c SS |
620 | |
621 | /* ELF debugging information is inserted into the psymtab in the | |
622 | order of least informative first - most informative last. Since | |
623 | the psymtab table is searched `most recent insertion first' this | |
624 | increases the probability that more detailed debug information | |
625 | for a section is found. | |
626 | ||
627 | For instance, an object file might contain both .mdebug (XCOFF) | |
628 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
629 | (searched last) and DWARF2 is inserted last (searched first). If | |
630 | we don't do this then the XCOFF info is found first - for code in | |
631 | an included file XCOFF info is useless. */ | |
632 | ||
633 | if (ei.mdebugsect) | |
634 | { | |
635 | const struct ecoff_debug_swap *swap; | |
636 | ||
637 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 638 | information. */ |
c906108c SS |
639 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
640 | if (swap) | |
d4f3574e | 641 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
642 | } |
643 | if (ei.stabsect) | |
644 | { | |
645 | asection *str_sect; | |
646 | ||
647 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 648 | a separate section. */ |
c906108c SS |
649 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
650 | ||
651 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
652 | if (str_sect) | |
653 | elfstab_build_psymtabs (objfile, | |
c906108c SS |
654 | mainline, |
655 | ei.stabsect->filepos, | |
656 | bfd_section_size (abfd, ei.stabsect), | |
657 | str_sect->filepos, | |
658 | bfd_section_size (abfd, str_sect)); | |
659 | } | |
660 | if (dwarf2_has_info (abfd)) | |
661 | { | |
662 | /* DWARF 2 sections */ | |
d4f3574e | 663 | dwarf2_build_psymtabs (objfile, mainline); |
c906108c SS |
664 | } |
665 | else if (ei.dboffset && ei.lnoffset) | |
666 | { | |
667 | /* DWARF sections */ | |
668 | dwarf_build_psymtabs (objfile, | |
d4f3574e | 669 | mainline, |
c906108c SS |
670 | ei.dboffset, ei.dbsize, |
671 | ei.lnoffset, ei.lnsize); | |
672 | } | |
673 | ||
674 | /* Install any minimal symbols that have been collected as the current | |
675 | minimal symbols for this objfile. */ | |
676 | ||
677 | install_minimal_symbols (objfile); | |
678 | ||
679 | do_cleanups (back_to); | |
680 | } | |
681 | ||
682 | /* This cleans up the objfile's sym_stab_info pointer, and the chain of | |
683 | stab_section_info's, that might be dangling from it. */ | |
684 | ||
685 | static void | |
fba45db2 | 686 | free_elfinfo (PTR objp) |
c906108c | 687 | { |
c5aa993b | 688 | struct objfile *objfile = (struct objfile *) objp; |
c906108c SS |
689 | struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; |
690 | struct stab_section_info *ssi, *nssi; | |
691 | ||
692 | ssi = dbxinfo->stab_section_info; | |
693 | while (ssi) | |
694 | { | |
695 | nssi = ssi->next; | |
696 | mfree (objfile->md, ssi); | |
697 | ssi = nssi; | |
698 | } | |
699 | ||
700 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
701 | } | |
702 | ||
703 | ||
704 | /* Initialize anything that needs initializing when a completely new symbol | |
705 | file is specified (not just adding some symbols from another file, e.g. a | |
706 | shared library). | |
707 | ||
708 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ | |
709 | ||
710 | static void | |
fba45db2 | 711 | elf_new_init (struct objfile *ignore) |
c906108c SS |
712 | { |
713 | stabsread_new_init (); | |
714 | buildsym_new_init (); | |
715 | } | |
716 | ||
717 | /* Perform any local cleanups required when we are done with a particular | |
718 | objfile. I.E, we are in the process of discarding all symbol information | |
719 | for an objfile, freeing up all memory held for it, and unlinking the | |
720 | objfile struct from the global list of known objfiles. */ | |
721 | ||
722 | static void | |
fba45db2 | 723 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 724 | { |
c5aa993b | 725 | if (objfile->sym_stab_info != NULL) |
c906108c | 726 | { |
c5aa993b | 727 | mfree (objfile->md, objfile->sym_stab_info); |
c906108c SS |
728 | } |
729 | } | |
730 | ||
731 | /* ELF specific initialization routine for reading symbols. | |
732 | ||
733 | It is passed a pointer to a struct sym_fns which contains, among other | |
734 | things, the BFD for the file whose symbols are being read, and a slot for | |
735 | a pointer to "private data" which we can fill with goodies. | |
736 | ||
737 | For now at least, we have nothing in particular to do, so this function is | |
738 | just a stub. */ | |
739 | ||
740 | static void | |
fba45db2 | 741 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
742 | { |
743 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
744 | find this causes a significant slowdown in gdb then we could | |
745 | set it in the debug symbol readers only when necessary. */ | |
746 | objfile->flags |= OBJF_REORDERED; | |
747 | } | |
748 | ||
749 | /* When handling an ELF file that contains Sun STABS debug info, | |
750 | some of the debug info is relative to the particular chunk of the | |
751 | section that was generated in its individual .o file. E.g. | |
752 | offsets to static variables are relative to the start of the data | |
753 | segment *for that module before linking*. This information is | |
754 | painfully squirreled away in the ELF symbol table as local symbols | |
755 | with wierd names. Go get 'em when needed. */ | |
756 | ||
757 | void | |
fba45db2 | 758 | elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
c906108c SS |
759 | { |
760 | char *filename = pst->filename; | |
761 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
762 | struct stab_section_info *maybe = dbx->stab_section_info; | |
763 | struct stab_section_info *questionable = 0; | |
764 | int i; | |
765 | char *p; | |
766 | ||
767 | /* The ELF symbol info doesn't include path names, so strip the path | |
768 | (if any) from the psymtab filename. */ | |
769 | while (0 != (p = strchr (filename, '/'))) | |
c5aa993b | 770 | filename = p + 1; |
c906108c SS |
771 | |
772 | /* FIXME: This linear search could speed up significantly | |
773 | if it was chained in the right order to match how we search it, | |
774 | and if we unchained when we found a match. */ | |
775 | for (; maybe; maybe = maybe->next) | |
776 | { | |
777 | if (filename[0] == maybe->filename[0] | |
778 | && STREQ (filename, maybe->filename)) | |
779 | { | |
780 | /* We found a match. But there might be several source files | |
781 | (from different directories) with the same name. */ | |
782 | if (0 == maybe->found) | |
783 | break; | |
c5aa993b | 784 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
785 | } |
786 | } | |
787 | ||
788 | if (maybe == 0 && questionable != 0) | |
789 | { | |
790 | complain (&stab_info_questionable_complaint, filename); | |
791 | maybe = questionable; | |
792 | } | |
793 | ||
794 | if (maybe) | |
795 | { | |
796 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
797 | maybe->found++; | |
798 | pst->section_offsets = (struct section_offsets *) | |
96baa820 | 799 | obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS); |
c906108c | 800 | for (i = 0; i < SECT_OFF_MAX; i++) |
a4c8257b | 801 | (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
c906108c SS |
802 | return; |
803 | } | |
804 | ||
805 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 806 | if (dbx->stab_section_info) /* If there *is* any info, */ |
c906108c SS |
807 | complain (&stab_info_mismatch_complaint, filename); |
808 | } | |
809 | \f | |
810 | /* Register that we are able to handle ELF object file formats. */ | |
811 | ||
812 | static struct sym_fns elf_sym_fns = | |
813 | { | |
814 | bfd_target_elf_flavour, | |
c5aa993b JM |
815 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
816 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
817 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
818 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
96baa820 | 819 | default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
c5aa993b | 820 | NULL /* next: pointer to next struct sym_fns */ |
c906108c SS |
821 | }; |
822 | ||
823 | void | |
fba45db2 | 824 | _initialize_elfread (void) |
c906108c SS |
825 | { |
826 | add_symtab_fns (&elf_sym_fns); | |
827 | } |