Commit | Line | Data |
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35f5886e | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
c2e4669f | 2 | Copyright 1991, 1992 Free Software Foundation, Inc. |
35f5886e FF |
3 | Written by Fred Fish at Cygnus Support. |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
35f5886e | 21 | #include "defs.h" |
35f5886e | 22 | #include "bfd.h" |
fc773653 | 23 | #include <time.h> /* For time_t in libbfd.h. */ |
ddf5d7e8 | 24 | #include <sys/types.h> /* For time_t, if not in time.h. */ |
f70be3e4 | 25 | #include "libbfd.h" /* For bfd_elf_find_section */ |
2084a176 | 26 | #include "libelf.h" |
35f5886e | 27 | #include "symtab.h" |
1ab3bf1b | 28 | #include "symfile.h" |
5e2e79f8 | 29 | #include "objfiles.h" |
be772100 | 30 | #include "buildsym.h" |
2731625a | 31 | #include "stabsread.h" |
2670f34d | 32 | #include "gdb-stabs.h" |
51b80b00 | 33 | #include "complaints.h" |
740b7efa | 34 | #include <string.h> |
2e4964ad | 35 | #include "demangle.h" |
35f5886e | 36 | |
2670f34d JG |
37 | /* The struct elfinfo is available only during ELF symbol table and |
38 | psymtab reading. It is destroyed at the complation of psymtab-reading. | |
39 | It's local to elf_symfile_read. */ | |
40 | ||
35f5886e | 41 | struct elfinfo { |
d5931d79 | 42 | file_ptr dboffset; /* Offset to dwarf debug section */ |
35f5886e | 43 | unsigned int dbsize; /* Size of dwarf debug section */ |
d5931d79 | 44 | file_ptr lnoffset; /* Offset to dwarf line number section */ |
35f5886e | 45 | unsigned int lnsize; /* Size of dwarf line number section */ |
346168a2 JG |
46 | asection *stabsect; /* Section pointer for .stab section */ |
47 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
35f5886e FF |
48 | }; |
49 | ||
2670f34d JG |
50 | /* Various things we might complain about... */ |
51 | ||
52 | struct complaint section_info_complaint = | |
53 | {"elf/stab section information %s without a preceding file symbol", 0, 0}; | |
54 | ||
55 | struct complaint section_info_dup_complaint = | |
56 | {"duplicated elf/stab section information for %s", 0, 0}; | |
57 | ||
58 | struct complaint stab_info_mismatch_complaint = | |
59 | {"elf/stab section information missing for %s", 0, 0}; | |
60 | ||
61 | struct complaint stab_info_questionable_complaint = | |
62 | {"elf/stab section information questionable for %s", 0, 0}; | |
63 | ||
1ab3bf1b | 64 | static void |
80d68b1d | 65 | elf_symfile_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
66 | |
67 | static void | |
80d68b1d | 68 | elf_new_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
69 | |
70 | static void | |
2670f34d | 71 | elf_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); |
80d68b1d FF |
72 | |
73 | static void | |
74 | elf_symfile_finish PARAMS ((struct objfile *)); | |
1ab3bf1b JG |
75 | |
76 | static void | |
be772100 | 77 | elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); |
1ab3bf1b | 78 | |
2670f34d JG |
79 | static void |
80 | free_elfinfo PARAMS ((PTR)); | |
81 | ||
82 | static struct section_offsets * | |
83 | elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
84 | ||
51b57ded FF |
85 | static void |
86 | record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR, | |
87 | enum minimal_symbol_type, char *, | |
88 | struct objfile *)); | |
1ab3bf1b JG |
89 | |
90 | static void | |
91 | elf_locate_sections PARAMS ((bfd *, asection *, PTR)); | |
92 | ||
35f5886e FF |
93 | /* We are called once per section from elf_symfile_read. We |
94 | need to examine each section we are passed, check to see | |
95 | if it is something we are interested in processing, and | |
96 | if so, stash away some access information for the section. | |
97 | ||
98 | For now we recognize the dwarf debug information sections and | |
99 | line number sections from matching their section names. The | |
100 | ELF definition is no real help here since it has no direct | |
101 | knowledge of DWARF (by design, so any debugging format can be | |
102 | used). | |
103 | ||
346168a2 JG |
104 | We also recognize the ".stab" sections used by the Sun compilers |
105 | released with Solaris 2. | |
106 | ||
35f5886e FF |
107 | FIXME: The section names should not be hardwired strings. */ |
108 | ||
109 | static void | |
be772100 JG |
110 | elf_locate_sections (ignore_abfd, sectp, eip) |
111 | bfd *ignore_abfd; | |
1ab3bf1b JG |
112 | asection *sectp; |
113 | PTR eip; | |
35f5886e | 114 | { |
1ab3bf1b JG |
115 | register struct elfinfo *ei; |
116 | ||
117 | ei = (struct elfinfo *) eip; | |
35f5886e FF |
118 | if (STREQ (sectp -> name, ".debug")) |
119 | { | |
120 | ei -> dboffset = sectp -> filepos; | |
e5849334 | 121 | ei -> dbsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e FF |
122 | } |
123 | else if (STREQ (sectp -> name, ".line")) | |
124 | { | |
125 | ei -> lnoffset = sectp -> filepos; | |
e5849334 | 126 | ei -> lnsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e | 127 | } |
346168a2 JG |
128 | else if (STREQ (sectp -> name, ".stab")) |
129 | { | |
130 | ei -> stabsect = sectp; | |
131 | } | |
132 | else if (STREQ (sectp -> name, ".stab.index")) | |
133 | { | |
134 | ei -> stabindexsect = sectp; | |
135 | } | |
35f5886e FF |
136 | } |
137 | ||
1ab3bf1b JG |
138 | #if 0 /* Currently unused */ |
139 | ||
f8b76e70 | 140 | char * |
1ab3bf1b JG |
141 | elf_interpreter (abfd) |
142 | bfd *abfd; | |
f8b76e70 FF |
143 | { |
144 | sec_ptr interp_sec; | |
145 | unsigned size; | |
146 | char *interp = NULL; | |
147 | ||
148 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
149 | if (interp_sec) | |
150 | { | |
151 | size = bfd_section_size (abfd, interp_sec); | |
152 | interp = alloca (size); | |
153 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr)0, | |
154 | size)) | |
155 | { | |
156 | interp = savestring (interp, size - 1); | |
157 | } | |
158 | else | |
159 | { | |
160 | interp = NULL; | |
161 | } | |
162 | } | |
163 | return (interp); | |
164 | } | |
165 | ||
1ab3bf1b JG |
166 | #endif |
167 | ||
346168a2 JG |
168 | static void |
169 | record_minimal_symbol_and_info (name, address, ms_type, info, objfile) | |
170 | char *name; | |
171 | CORE_ADDR address; | |
172 | enum minimal_symbol_type ms_type; | |
173 | char *info; /* FIXME, is this really char *? */ | |
174 | struct objfile *objfile; | |
175 | { | |
610a7e74 ILT |
176 | int section; |
177 | ||
178 | /* Guess the section from the type. This is likely to be wrong in | |
179 | some cases. */ | |
180 | switch (ms_type) | |
181 | { | |
182 | case mst_text: | |
183 | case mst_file_text: | |
184 | section = SECT_OFF_TEXT; | |
185 | break; | |
186 | case mst_data: | |
187 | case mst_file_data: | |
188 | section = SECT_OFF_DATA; | |
189 | break; | |
190 | case mst_bss: | |
191 | case mst_file_bss: | |
192 | section = SECT_OFF_BSS; | |
193 | break; | |
194 | default: | |
195 | section = -1; | |
196 | break; | |
197 | } | |
198 | ||
346168a2 | 199 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); |
610a7e74 | 200 | prim_record_minimal_symbol_and_info (name, address, ms_type, info, section); |
346168a2 JG |
201 | } |
202 | ||
f8b76e70 FF |
203 | /* |
204 | ||
205 | LOCAL FUNCTION | |
206 | ||
207 | elf_symtab_read -- read the symbol table of an ELF file | |
208 | ||
209 | SYNOPSIS | |
210 | ||
be772100 | 211 | void elf_symtab_read (bfd *abfd, CORE_ADDR addr, |
1ab3bf1b | 212 | struct objfile *objfile) |
f8b76e70 FF |
213 | |
214 | DESCRIPTION | |
215 | ||
216 | Given an open bfd, a base address to relocate symbols to, and a | |
217 | flag that specifies whether or not this bfd is for an executable | |
218 | or not (may be shared library for example), add all the global | |
1ab3bf1b | 219 | function and data symbols to the minimal symbol table. |
f8b76e70 | 220 | |
2670f34d JG |
221 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
222 | defined in the ELF symbol table, which can be used to locate | |
223 | the beginnings of sections from each ".o" file that was linked to | |
224 | form the executable objfile. We gather any such info and record it | |
225 | in data structures hung off the objfile's private data. | |
226 | ||
f8b76e70 FF |
227 | */ |
228 | ||
a7446af6 | 229 | static void |
be772100 | 230 | elf_symtab_read (abfd, addr, objfile) |
1ab3bf1b JG |
231 | bfd *abfd; |
232 | CORE_ADDR addr; | |
1ab3bf1b | 233 | struct objfile *objfile; |
a7446af6 FF |
234 | { |
235 | unsigned int storage_needed; | |
236 | asymbol *sym; | |
237 | asymbol **symbol_table; | |
238 | unsigned int number_of_symbols; | |
239 | unsigned int i; | |
2670f34d | 240 | int index; |
a7446af6 | 241 | struct cleanup *back_to; |
f8b76e70 | 242 | CORE_ADDR symaddr; |
1ab3bf1b | 243 | enum minimal_symbol_type ms_type; |
6c8f91a1 | 244 | /* If sectinfo is nonNULL, it contains section info that should end up |
2670f34d | 245 | filed in the objfile. */ |
6c8f91a1 | 246 | struct stab_section_info *sectinfo = NULL; |
2670f34d JG |
247 | /* If filesym is nonzero, it points to a file symbol, but we haven't |
248 | seen any section info for it yet. */ | |
249 | asymbol *filesym = 0; | |
250 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
251 | objfile->sym_private; | |
6c8f91a1 | 252 | unsigned long size; |
a7446af6 FF |
253 | |
254 | storage_needed = get_symtab_upper_bound (abfd); | |
a7446af6 FF |
255 | if (storage_needed > 0) |
256 | { | |
3b0b9220 | 257 | symbol_table = (asymbol **) xmalloc (storage_needed); |
a7446af6 FF |
258 | back_to = make_cleanup (free, symbol_table); |
259 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
a7446af6 FF |
260 | for (i = 0; i < number_of_symbols; i++) |
261 | { | |
2670f34d | 262 | sym = symbol_table[i]; |
6c8f91a1 | 263 | if (sym -> name == NULL || *sym -> name == '\0') |
379dd965 | 264 | { |
6c8f91a1 FF |
265 | /* Skip names that don't exist (shouldn't happen), or names |
266 | that are null strings (may happen). */ | |
379dd965 FF |
267 | continue; |
268 | } | |
6c8f91a1 FF |
269 | if (sym -> flags & BSF_FILE) |
270 | { | |
271 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
272 | Chain any old one onto the objfile; remember new sym. */ | |
273 | if (sectinfo != NULL) | |
274 | { | |
275 | sectinfo -> next = dbx -> stab_section_info; | |
276 | dbx -> stab_section_info = sectinfo; | |
277 | sectinfo = NULL; | |
278 | } | |
279 | filesym = sym; | |
280 | } | |
281 | else if (sym -> flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) | |
a7446af6 | 282 | { |
6c8f91a1 FF |
283 | /* Select global/local/weak symbols. Note that bfd puts abs |
284 | symbols in their own section, so all symbols we are | |
285 | interested in will have a section. */ | |
a608f919 FF |
286 | /* Bfd symbols are section relative. */ |
287 | symaddr = sym -> value + sym -> section -> vma; | |
c2e4669f JG |
288 | /* Relocate all non-absolute symbols by base address. */ |
289 | if (sym -> section != &bfd_abs_section) | |
6c8f91a1 FF |
290 | { |
291 | symaddr += addr; | |
292 | } | |
f8b76e70 FF |
293 | /* For non-absolute symbols, use the type of the section |
294 | they are relative to, to intuit text/data. Bfd provides | |
295 | no way of figuring this out for absolute symbols. */ | |
6c8f91a1 FF |
296 | if (sym -> section == &bfd_abs_section) |
297 | { | |
298 | ms_type = mst_abs; | |
299 | } | |
300 | else if (sym -> section -> flags & SEC_CODE) | |
f8b76e70 | 301 | { |
379dd965 FF |
302 | if (sym -> flags & BSF_GLOBAL) |
303 | { | |
304 | ms_type = mst_text; | |
305 | } | |
5ec3ba25 | 306 | else if (sym->name[0] == '.' && sym->name[1] == 'L') |
bbf1ff10 JK |
307 | /* Looks like a compiler-generated label. Skip it. |
308 | The assembler should be skipping these (to keep | |
309 | executables small), but apparently with gcc on the | |
310 | delta m88k SVR4, it loses. So to have us check too | |
311 | should be harmless (but I encourage people to fix this | |
312 | in the assembler instead of adding checks here). */ | |
5ec3ba25 | 313 | continue; |
379dd965 FF |
314 | else |
315 | { | |
316 | ms_type = mst_file_text; | |
317 | } | |
f8b76e70 | 318 | } |
d35bf52d | 319 | else if (sym -> section -> flags & SEC_DATA) |
f8b76e70 | 320 | { |
379dd965 FF |
321 | if (sym -> flags & BSF_GLOBAL) |
322 | { | |
323 | if (sym -> section -> flags & SEC_HAS_CONTENTS) | |
324 | { | |
325 | ms_type = mst_data; | |
326 | } | |
327 | else | |
328 | { | |
329 | ms_type = mst_bss; | |
330 | } | |
331 | } | |
6c8f91a1 | 332 | else if (sym -> flags & BSF_LOCAL) |
379dd965 | 333 | { |
6c8f91a1 FF |
334 | /* Named Local variable in a Data section. Check its |
335 | name for stabs-in-elf. The STREQ macro checks the | |
336 | first character inline, so we only actually do a | |
337 | strcmp function call on names that start with 'B' | |
338 | or 'D' */ | |
339 | index = SECT_OFF_MAX; | |
340 | if (STREQ ("Bbss.bss", sym -> name)) | |
341 | { | |
342 | index = SECT_OFF_BSS; | |
343 | } | |
344 | else if (STREQ ("Ddata.data", sym -> name)) | |
345 | { | |
346 | index = SECT_OFF_DATA; | |
347 | } | |
348 | else if (STREQ ("Drodata.rodata", sym -> name)) | |
349 | { | |
350 | index = SECT_OFF_RODATA; | |
351 | } | |
352 | if (index != SECT_OFF_MAX) | |
353 | { | |
354 | /* Found a special local symbol. Allocate a | |
355 | sectinfo, if needed, and fill it in. */ | |
356 | if (sectinfo == NULL) | |
357 | { | |
358 | sectinfo = (struct stab_section_info *) | |
359 | xmmalloc (objfile -> md, sizeof (*sectinfo)); | |
360 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); | |
361 | if (filesym == NULL) | |
362 | { | |
363 | complain (§ion_info_complaint, | |
364 | sym -> name); | |
365 | } | |
366 | else | |
367 | { | |
368 | sectinfo -> filename = | |
369 | (char *) filesym -> name; | |
370 | } | |
371 | } | |
372 | if (sectinfo -> sections[index] != 0) | |
373 | { | |
374 | complain (§ion_info_dup_complaint, | |
375 | sectinfo -> filename); | |
376 | } | |
377 | /* Bfd symbols are section relative. */ | |
378 | symaddr = sym -> value + sym -> section -> vma; | |
379 | /* Relocate non-absolute symbols by base address. */ | |
380 | if (sym -> section != &bfd_abs_section) | |
381 | { | |
382 | symaddr += addr; | |
383 | } | |
384 | sectinfo -> sections[index] = symaddr; | |
385 | /* The special local symbols don't go in the | |
386 | minimal symbol table, so ignore this one. */ | |
387 | continue; | |
388 | } | |
389 | /* Not a special stabs-in-elf symbol, do regular | |
390 | symbol processing. */ | |
379dd965 FF |
391 | if (sym -> section -> flags & SEC_HAS_CONTENTS) |
392 | { | |
393 | ms_type = mst_file_data; | |
394 | } | |
395 | else | |
396 | { | |
397 | ms_type = mst_file_bss; | |
398 | } | |
399 | } | |
6c8f91a1 FF |
400 | else |
401 | { | |
402 | ms_type = mst_unknown; | |
403 | } | |
f8b76e70 FF |
404 | } |
405 | else | |
406 | { | |
4c7c6bab JG |
407 | /* FIXME: Solaris2 shared libraries include lots of |
408 | odd "absolute" and "undefined" symbols, that play | |
409 | hob with actions like finding what function the PC | |
379dd965 | 410 | is in. Ignore them if they aren't text, data, or bss. */ |
4c7c6bab JG |
411 | /* ms_type = mst_unknown; */ |
412 | continue; /* Skip this symbol. */ | |
f8b76e70 | 413 | } |
346168a2 | 414 | /* Pass symbol size field in via BFD. FIXME!!! */ |
538b2068 | 415 | size = ((elf_symbol_type *) sym) -> internal_elf_sym.st_size; |
6c8f91a1 FF |
416 | record_minimal_symbol_and_info ((char *) sym -> name, symaddr, |
417 | ms_type, (PTR) size, objfile); | |
2670f34d | 418 | } |
a7446af6 FF |
419 | } |
420 | do_cleanups (back_to); | |
421 | } | |
422 | } | |
423 | ||
35f5886e FF |
424 | /* Scan and build partial symbols for a symbol file. |
425 | We have been initialized by a call to elf_symfile_init, which | |
426 | currently does nothing. | |
427 | ||
2670f34d JG |
428 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols |
429 | in each section. We simplify it down to a single offset for all | |
430 | symbols. FIXME. | |
35f5886e FF |
431 | |
432 | MAINLINE is true if we are reading the main symbol | |
433 | table (as opposed to a shared lib or dynamically loaded file). | |
434 | ||
435 | This function only does the minimum work necessary for letting the | |
436 | user "name" things symbolically; it does not read the entire symtab. | |
437 | Instead, it reads the external and static symbols and puts them in partial | |
438 | symbol tables. When more extensive information is requested of a | |
439 | file, the corresponding partial symbol table is mutated into a full | |
440 | fledged symbol table by going back and reading the symbols | |
346168a2 JG |
441 | for real. |
442 | ||
443 | We look for sections with specific names, to tell us what debug | |
444 | format to look for: FIXME!!! | |
445 | ||
446 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
447 | elfstab_build_psymtabs() handles STABS symbols. | |
a7446af6 FF |
448 | |
449 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
450 | like a COFF symbol table, but has only the minimal information necessary | |
346168a2 JG |
451 | for linking. We process this also, and use the information to |
452 | build gdb's minimal symbol table. This gives us some minimal debugging | |
453 | capability even for files compiled without -g. */ | |
35f5886e FF |
454 | |
455 | static void | |
2670f34d | 456 | elf_symfile_read (objfile, section_offsets, mainline) |
80d68b1d | 457 | struct objfile *objfile; |
2670f34d | 458 | struct section_offsets *section_offsets; |
1ab3bf1b | 459 | int mainline; |
35f5886e | 460 | { |
80d68b1d | 461 | bfd *abfd = objfile->obfd; |
35f5886e | 462 | struct elfinfo ei; |
a7446af6 | 463 | struct cleanup *back_to; |
346168a2 | 464 | CORE_ADDR offset; |
35f5886e | 465 | |
1ab3bf1b JG |
466 | init_minimal_symbol_collection (); |
467 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
a7446af6 | 468 | |
2670f34d | 469 | memset ((char *) &ei, 0, sizeof (ei)); |
6b801388 | 470 | |
2670f34d JG |
471 | /* Allocate struct to keep track of the symfile */ |
472 | objfile->sym_private = (PTR) | |
473 | xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); | |
474 | memset ((char *) objfile->sym_private, 0, sizeof (struct dbx_symfile_info)); | |
475 | make_cleanup (free_elfinfo, (PTR) objfile); | |
6b801388 | 476 | |
2670f34d JG |
477 | /* Process the normal ELF symbol table first. This may write some |
478 | chain of info into the dbx_symfile_info in objfile->sym_private, | |
479 | which can later be used by elfstab_offset_sections. */ | |
a7446af6 | 480 | |
2670f34d JG |
481 | /* FIXME, should take a section_offsets param, not just an offset. */ |
482 | offset = ANOFFSET (section_offsets, 0); | |
346168a2 | 483 | elf_symtab_read (abfd, offset, objfile); |
a7446af6 | 484 | |
346168a2 | 485 | /* Now process debugging information, which is contained in |
a7446af6 FF |
486 | special ELF sections. We first have to find them... */ |
487 | ||
1ab3bf1b | 488 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei); |
35f5886e FF |
489 | if (ei.dboffset && ei.lnoffset) |
490 | { | |
346168a2 | 491 | /* DWARF sections */ |
d5931d79 | 492 | dwarf_build_psymtabs (objfile, |
2670f34d | 493 | section_offsets, mainline, |
35f5886e | 494 | ei.dboffset, ei.dbsize, |
d5931d79 | 495 | ei.lnoffset, ei.lnsize); |
35f5886e | 496 | } |
346168a2 JG |
497 | if (ei.stabsect) |
498 | { | |
499 | /* STABS sections */ | |
500 | ||
501 | /* FIXME: Sun didn't really know how to implement this well. | |
502 | They made .stab sections that don't point to the .stabstr | |
503 | section with the sh_link field. BFD doesn't make string table | |
504 | sections visible to the caller. So we have to search the | |
505 | ELF section table, not the BFD section table, for the string | |
506 | table. */ | |
2084a176 | 507 | struct elf32_internal_shdr *elf_sect; |
346168a2 | 508 | |
872dd3fe | 509 | elf_sect = bfd_elf_find_section (abfd, ".stabstr"); |
346168a2 JG |
510 | if (elf_sect) |
511 | elfstab_build_psymtabs (objfile, | |
2670f34d | 512 | section_offsets, |
346168a2 JG |
513 | mainline, |
514 | ei.stabsect->filepos, /* .stab offset */ | |
515 | bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */ | |
d5931d79 | 516 | (file_ptr) elf_sect->sh_offset, /* .stabstr offset */ |
346168a2 JG |
517 | elf_sect->sh_size); /* .stabstr size */ |
518 | } | |
a7446af6 | 519 | |
1ab3bf1b | 520 | if (!have_partial_symbols ()) |
35f5886e FF |
521 | { |
522 | wrap_here (""); | |
523 | printf_filtered ("(no debugging symbols found)..."); | |
524 | wrap_here (""); | |
525 | } | |
a7446af6 | 526 | |
1ab3bf1b JG |
527 | /* Install any minimal symbols that have been collected as the current |
528 | minimal symbols for this objfile. */ | |
529 | ||
80d68b1d | 530 | install_minimal_symbols (objfile); |
1ab3bf1b | 531 | |
a7446af6 | 532 | do_cleanups (back_to); |
35f5886e FF |
533 | } |
534 | ||
2670f34d JG |
535 | /* This cleans up the objfile's sym_private pointer, and the chain of |
536 | stab_section_info's, that might be dangling from it. */ | |
537 | ||
538 | static void | |
539 | free_elfinfo (objp) | |
540 | PTR objp; | |
541 | { | |
542 | struct objfile *objfile = (struct objfile *)objp; | |
543 | struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *) | |
544 | objfile->sym_private; | |
545 | struct stab_section_info *ssi, *nssi; | |
546 | ||
547 | ssi = dbxinfo->stab_section_info; | |
548 | while (ssi) | |
549 | { | |
550 | nssi = ssi->next; | |
551 | mfree (objfile->md, ssi); | |
552 | ssi = nssi; | |
553 | } | |
554 | ||
555 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
556 | } | |
557 | ||
558 | ||
35f5886e FF |
559 | /* Initialize anything that needs initializing when a completely new symbol |
560 | file is specified (not just adding some symbols from another file, e.g. a | |
561 | shared library). | |
562 | ||
346168a2 | 563 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ |
35f5886e FF |
564 | |
565 | static void | |
be772100 JG |
566 | elf_new_init (ignore) |
567 | struct objfile *ignore; | |
80d68b1d | 568 | { |
d07734e3 | 569 | stabsread_new_init (); |
80d68b1d FF |
570 | buildsym_new_init (); |
571 | } | |
572 | ||
573 | /* Perform any local cleanups required when we are done with a particular | |
574 | objfile. I.E, we are in the process of discarding all symbol information | |
575 | for an objfile, freeing up all memory held for it, and unlinking the | |
576 | objfile struct from the global list of known objfiles. */ | |
577 | ||
578 | static void | |
579 | elf_symfile_finish (objfile) | |
580 | struct objfile *objfile; | |
35f5886e | 581 | { |
80d68b1d FF |
582 | if (objfile -> sym_private != NULL) |
583 | { | |
584 | mfree (objfile -> md, objfile -> sym_private); | |
585 | } | |
35f5886e FF |
586 | } |
587 | ||
588 | /* ELF specific initialization routine for reading symbols. | |
589 | ||
590 | It is passed a pointer to a struct sym_fns which contains, among other | |
591 | things, the BFD for the file whose symbols are being read, and a slot for | |
592 | a pointer to "private data" which we can fill with goodies. | |
593 | ||
594 | For now at least, we have nothing in particular to do, so this function is | |
595 | just a stub. */ | |
596 | ||
597 | static void | |
be772100 JG |
598 | elf_symfile_init (ignore) |
599 | struct objfile *ignore; | |
35f5886e FF |
600 | { |
601 | } | |
602 | ||
2670f34d JG |
603 | /* ELF specific parsing routine for section offsets. |
604 | ||
605 | Plain and simple for now. */ | |
606 | ||
607 | static | |
608 | struct section_offsets * | |
609 | elf_symfile_offsets (objfile, addr) | |
610 | struct objfile *objfile; | |
611 | CORE_ADDR addr; | |
612 | { | |
613 | struct section_offsets *section_offsets; | |
614 | int i; | |
615 | ||
616 | section_offsets = (struct section_offsets *) | |
617 | obstack_alloc (&objfile -> psymbol_obstack, | |
618 | sizeof (struct section_offsets) + | |
619 | sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
620 | ||
621 | for (i = 0; i < SECT_OFF_MAX; i++) | |
622 | ANOFFSET (section_offsets, i) = addr; | |
623 | ||
624 | return section_offsets; | |
625 | } | |
626 | \f | |
627 | /* When handling an ELF file that contains Sun STABS debug info, | |
628 | some of the debug info is relative to the particular chunk of the | |
629 | section that was generated in its individual .o file. E.g. | |
630 | offsets to static variables are relative to the start of the data | |
631 | segment *for that module before linking*. This information is | |
632 | painfully squirreled away in the ELF symbol table as local symbols | |
633 | with wierd names. Go get 'em when needed. */ | |
634 | ||
635 | void | |
636 | elfstab_offset_sections (objfile, pst) | |
637 | struct objfile *objfile; | |
638 | struct partial_symtab *pst; | |
639 | { | |
640 | char *filename = pst->filename; | |
641 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
642 | objfile->sym_private; | |
643 | struct stab_section_info *maybe = dbx->stab_section_info; | |
644 | struct stab_section_info *questionable = 0; | |
645 | int i; | |
646 | char *p; | |
647 | ||
648 | /* The ELF symbol info doesn't include path names, so strip the path | |
649 | (if any) from the psymtab filename. */ | |
650 | while (0 != (p = strchr (filename, '/'))) | |
651 | filename = p+1; | |
652 | ||
653 | /* FIXME: This linear search could speed up significantly | |
654 | if it was chained in the right order to match how we search it, | |
655 | and if we unchained when we found a match. */ | |
656 | for (; maybe; maybe = maybe->next) | |
657 | { | |
658 | if (filename[0] == maybe->filename[0] | |
2e4964ad | 659 | && STREQ (filename, maybe->filename)) |
2670f34d JG |
660 | { |
661 | /* We found a match. But there might be several source files | |
662 | (from different directories) with the same name. */ | |
663 | if (0 == maybe->found) | |
664 | break; | |
665 | questionable = maybe; /* Might use it later. */ | |
666 | } | |
667 | } | |
668 | ||
669 | if (maybe == 0 && questionable != 0) | |
670 | { | |
671 | complain (&stab_info_questionable_complaint, filename); | |
672 | maybe = questionable; | |
673 | } | |
674 | ||
675 | if (maybe) | |
676 | { | |
677 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
678 | maybe->found++; | |
679 | pst->section_offsets = (struct section_offsets *) | |
680 | obstack_alloc (&objfile -> psymbol_obstack, | |
681 | sizeof (struct section_offsets) + | |
682 | sizeof (pst->section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
683 | ||
684 | for (i = 0; i < SECT_OFF_MAX; i++) | |
685 | ANOFFSET (pst->section_offsets, i) = maybe->sections[i]; | |
686 | return; | |
687 | } | |
688 | ||
689 | /* We were unable to find any offsets for this file. Complain. */ | |
690 | if (dbx->stab_section_info) /* If there *is* any info, */ | |
691 | complain (&stab_info_mismatch_complaint, filename); | |
692 | } | |
35f5886e FF |
693 | \f |
694 | /* Register that we are able to handle ELF object file formats and DWARF | |
695 | debugging formats. | |
696 | ||
697 | Unlike other object file formats, where the debugging information format | |
698 | is implied by the object file format, the ELF object file format and the | |
699 | DWARF debugging information format are two distinct, and potentially | |
700 | separate entities. I.E. it is perfectly possible to have ELF objects | |
701 | with debugging formats other than DWARF. And it is conceivable that the | |
702 | DWARF debugging format might be used with another object file format, | |
703 | like COFF, by simply using COFF's custom section feature. | |
704 | ||
705 | GDB, and to a lesser extent BFD, should support the notion of separate | |
706 | object file formats and debugging information formats. For now, we just | |
707 | use "elf" in the same sense as "a.out" or "coff", to imply both the ELF | |
708 | object file format and the DWARF debugging format. */ | |
709 | ||
80d68b1d FF |
710 | static struct sym_fns elf_sym_fns = |
711 | { | |
35f5886e FF |
712 | "elf", /* sym_name: name or name prefix of BFD target type */ |
713 | 3, /* sym_namelen: number of significant sym_name chars */ | |
714 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
715 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
716 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
80d68b1d | 717 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ |
2670f34d | 718 | elf_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
35f5886e FF |
719 | NULL /* next: pointer to next struct sym_fns */ |
720 | }; | |
721 | ||
722 | void | |
1ab3bf1b | 723 | _initialize_elfread () |
35f5886e FF |
724 | { |
725 | add_symtab_fns (&elf_sym_fns); | |
726 | } |