Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
6aba47ca | 3 | Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
7b6bb8da | 4 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
9b254dd1 | 5 | Free Software Foundation, Inc. |
1bac305b | 6 | |
c906108c SS |
7 | Written by Fred Fish at Cygnus Support. |
8 | ||
c5aa993b | 9 | This file is part of GDB. |
c906108c | 10 | |
c5aa993b JM |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 13 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 14 | (at your option) any later version. |
c906108c | 15 | |
c5aa993b JM |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
c906108c | 20 | |
c5aa993b | 21 | You should have received a copy of the GNU General Public License |
a9762ec7 | 22 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
23 | |
24 | #include "defs.h" | |
25 | #include "bfd.h" | |
26 | #include "gdb_string.h" | |
27 | #include "elf-bfd.h" | |
31d99776 DJ |
28 | #include "elf/common.h" |
29 | #include "elf/internal.h" | |
c906108c SS |
30 | #include "elf/mips.h" |
31 | #include "symtab.h" | |
32 | #include "symfile.h" | |
33 | #include "objfiles.h" | |
34 | #include "buildsym.h" | |
35 | #include "stabsread.h" | |
36 | #include "gdb-stabs.h" | |
37 | #include "complaints.h" | |
38 | #include "demangle.h" | |
ccefe4c4 | 39 | #include "psympriv.h" |
0ba1096a | 40 | #include "filenames.h" |
07be84bf JK |
41 | #include "gdbtypes.h" |
42 | #include "value.h" | |
43 | #include "infcall.h" | |
0e30163f JK |
44 | #include "gdbthread.h" |
45 | #include "regcache.h" | |
0af1e9a5 | 46 | #include "bcache.h" |
c906108c | 47 | |
a14ed312 | 48 | extern void _initialize_elfread (void); |
392a587b | 49 | |
b11896a5 | 50 | /* Forward declarations. */ |
00b5771c | 51 | static const struct sym_fns elf_sym_fns_gdb_index; |
b11896a5 | 52 | static const struct sym_fns elf_sym_fns_lazy_psyms; |
9291a0cd | 53 | |
c906108c | 54 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 55 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
56 | It's local to elf_symfile_read. */ |
57 | ||
c5aa993b JM |
58 | struct elfinfo |
59 | { | |
c5aa993b JM |
60 | asection *stabsect; /* Section pointer for .stab section */ |
61 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
62 | asection *mdebugsect; /* Section pointer for .mdebug section */ | |
63 | }; | |
c906108c | 64 | |
12b9c64f | 65 | static void free_elfinfo (void *); |
c906108c | 66 | |
07be84bf JK |
67 | /* Minimal symbols located at the GOT entries for .plt - that is the real |
68 | pointer where the given entry will jump to. It gets updated by the real | |
69 | function address during lazy ld.so resolving in the inferior. These | |
70 | minimal symbols are indexed for <tab>-completion. */ | |
71 | ||
72 | #define SYMBOL_GOT_PLT_SUFFIX "@got.plt" | |
73 | ||
31d99776 DJ |
74 | /* Locate the segments in ABFD. */ |
75 | ||
76 | static struct symfile_segment_data * | |
77 | elf_symfile_segments (bfd *abfd) | |
78 | { | |
79 | Elf_Internal_Phdr *phdrs, **segments; | |
80 | long phdrs_size; | |
81 | int num_phdrs, num_segments, num_sections, i; | |
82 | asection *sect; | |
83 | struct symfile_segment_data *data; | |
84 | ||
85 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
86 | if (phdrs_size == -1) | |
87 | return NULL; | |
88 | ||
89 | phdrs = alloca (phdrs_size); | |
90 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); | |
91 | if (num_phdrs == -1) | |
92 | return NULL; | |
93 | ||
94 | num_segments = 0; | |
95 | segments = alloca (sizeof (Elf_Internal_Phdr *) * num_phdrs); | |
96 | for (i = 0; i < num_phdrs; i++) | |
97 | if (phdrs[i].p_type == PT_LOAD) | |
98 | segments[num_segments++] = &phdrs[i]; | |
99 | ||
100 | if (num_segments == 0) | |
101 | return NULL; | |
102 | ||
103 | data = XZALLOC (struct symfile_segment_data); | |
104 | data->num_segments = num_segments; | |
105 | data->segment_bases = XCALLOC (num_segments, CORE_ADDR); | |
106 | data->segment_sizes = XCALLOC (num_segments, CORE_ADDR); | |
107 | ||
108 | for (i = 0; i < num_segments; i++) | |
109 | { | |
110 | data->segment_bases[i] = segments[i]->p_vaddr; | |
111 | data->segment_sizes[i] = segments[i]->p_memsz; | |
112 | } | |
113 | ||
114 | num_sections = bfd_count_sections (abfd); | |
115 | data->segment_info = XCALLOC (num_sections, int); | |
116 | ||
117 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
118 | { | |
119 | int j; | |
120 | CORE_ADDR vma; | |
121 | ||
122 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
123 | continue; | |
124 | ||
125 | vma = bfd_get_section_vma (abfd, sect); | |
126 | ||
127 | for (j = 0; j < num_segments; j++) | |
128 | if (segments[j]->p_memsz > 0 | |
129 | && vma >= segments[j]->p_vaddr | |
a366c65a | 130 | && (vma - segments[j]->p_vaddr) < segments[j]->p_memsz) |
31d99776 DJ |
131 | { |
132 | data->segment_info[i] = j + 1; | |
133 | break; | |
134 | } | |
135 | ||
ad09a548 DJ |
136 | /* We should have found a segment for every non-empty section. |
137 | If we haven't, we will not relocate this section by any | |
138 | offsets we apply to the segments. As an exception, do not | |
139 | warn about SHT_NOBITS sections; in normal ELF execution | |
140 | environments, SHT_NOBITS means zero-initialized and belongs | |
141 | in a segment, but in no-OS environments some tools (e.g. ARM | |
142 | RealView) use SHT_NOBITS for uninitialized data. Since it is | |
143 | uninitialized, it doesn't need a program header. Such | |
144 | binaries are not relocatable. */ | |
145 | if (bfd_get_section_size (sect) > 0 && j == num_segments | |
146 | && (bfd_get_section_flags (abfd, sect) & SEC_LOAD) != 0) | |
31d99776 DJ |
147 | warning (_("Loadable segment \"%s\" outside of ELF segments"), |
148 | bfd_section_name (abfd, sect)); | |
149 | } | |
150 | ||
151 | return data; | |
152 | } | |
153 | ||
c906108c SS |
154 | /* We are called once per section from elf_symfile_read. We |
155 | need to examine each section we are passed, check to see | |
156 | if it is something we are interested in processing, and | |
157 | if so, stash away some access information for the section. | |
158 | ||
159 | For now we recognize the dwarf debug information sections and | |
160 | line number sections from matching their section names. The | |
161 | ELF definition is no real help here since it has no direct | |
162 | knowledge of DWARF (by design, so any debugging format can be | |
163 | used). | |
164 | ||
165 | We also recognize the ".stab" sections used by the Sun compilers | |
166 | released with Solaris 2. | |
167 | ||
168 | FIXME: The section names should not be hardwired strings (what | |
169 | should they be? I don't think most object file formats have enough | |
0963b4bd | 170 | section flags to specify what kind of debug section it is. |
c906108c SS |
171 | -kingdon). */ |
172 | ||
173 | static void | |
12b9c64f | 174 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
c906108c | 175 | { |
52f0bd74 | 176 | struct elfinfo *ei; |
c906108c SS |
177 | |
178 | ei = (struct elfinfo *) eip; | |
7ce59000 | 179 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 180 | { |
c5aa993b | 181 | ei->stabsect = sectp; |
c906108c | 182 | } |
6314a349 | 183 | else if (strcmp (sectp->name, ".stab.index") == 0) |
c906108c | 184 | { |
c5aa993b | 185 | ei->stabindexsect = sectp; |
c906108c | 186 | } |
6314a349 | 187 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 188 | { |
c5aa993b | 189 | ei->mdebugsect = sectp; |
c906108c SS |
190 | } |
191 | } | |
192 | ||
c906108c | 193 | static struct minimal_symbol * |
04a679b8 TT |
194 | record_minimal_symbol (const char *name, int name_len, int copy_name, |
195 | CORE_ADDR address, | |
f594e5e9 MC |
196 | enum minimal_symbol_type ms_type, |
197 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 198 | { |
5e2b427d UW |
199 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
200 | ||
0875794a JK |
201 | if (ms_type == mst_text || ms_type == mst_file_text |
202 | || ms_type == mst_text_gnu_ifunc) | |
5e2b427d | 203 | address = gdbarch_smash_text_address (gdbarch, address); |
c906108c | 204 | |
04a679b8 TT |
205 | return prim_record_minimal_symbol_full (name, name_len, copy_name, address, |
206 | ms_type, bfd_section->index, | |
207 | bfd_section, objfile); | |
c906108c SS |
208 | } |
209 | ||
7f86f058 | 210 | /* Read the symbol table of an ELF file. |
c906108c | 211 | |
62553543 | 212 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
213 | symbol table contains regular, dynamic, or synthetic symbols, add all |
214 | the global function and data symbols to the minimal symbol table. | |
c906108c | 215 | |
c5aa993b JM |
216 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
217 | defined in the ELF symbol table, which can be used to locate | |
218 | the beginnings of sections from each ".o" file that was linked to | |
219 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 220 | in data structures hung off the objfile's private data. */ |
c906108c | 221 | |
6f610d07 UW |
222 | #define ST_REGULAR 0 |
223 | #define ST_DYNAMIC 1 | |
224 | #define ST_SYNTHETIC 2 | |
225 | ||
c906108c | 226 | static void |
6f610d07 | 227 | elf_symtab_read (struct objfile *objfile, int type, |
04a679b8 TT |
228 | long number_of_symbols, asymbol **symbol_table, |
229 | int copy_names) | |
c906108c | 230 | { |
5e2b427d | 231 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
c906108c | 232 | asymbol *sym; |
c906108c | 233 | long i; |
c906108c | 234 | CORE_ADDR symaddr; |
d4f3574e | 235 | CORE_ADDR offset; |
c906108c SS |
236 | enum minimal_symbol_type ms_type; |
237 | /* If sectinfo is nonNULL, it contains section info that should end up | |
238 | filed in the objfile. */ | |
239 | struct stab_section_info *sectinfo = NULL; | |
240 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
241 | seen any section info for it yet. */ | |
242 | asymbol *filesym = 0; | |
1c9e8358 | 243 | /* Name of filesym. This is either a constant string or is saved on |
0af1e9a5 TT |
244 | the objfile's filename cache. */ |
245 | const char *filesymname = ""; | |
0a6ddd08 | 246 | struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info; |
d4f3574e | 247 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
c5aa993b | 248 | |
0cc7b392 | 249 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 250 | { |
0cc7b392 DJ |
251 | sym = symbol_table[i]; |
252 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 253 | { |
0cc7b392 | 254 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 255 | that are null strings (may happen). */ |
0cc7b392 DJ |
256 | continue; |
257 | } | |
c906108c | 258 | |
74763737 DJ |
259 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
260 | symbols which do not correspond to objects in the symbol table, | |
261 | but have some other target-specific meaning. */ | |
262 | if (bfd_is_target_special_symbol (objfile->obfd, sym)) | |
60c5725c DJ |
263 | { |
264 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
265 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
266 | continue; | |
267 | } | |
74763737 | 268 | |
0cc7b392 | 269 | offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
6f610d07 | 270 | if (type == ST_DYNAMIC |
0cc7b392 DJ |
271 | && sym->section == &bfd_und_section |
272 | && (sym->flags & BSF_FUNCTION)) | |
273 | { | |
274 | struct minimal_symbol *msym; | |
02c75f72 | 275 | bfd *abfd = objfile->obfd; |
dea91a5c | 276 | asection *sect; |
0cc7b392 DJ |
277 | |
278 | /* Symbol is a reference to a function defined in | |
279 | a shared library. | |
280 | If its value is non zero then it is usually the address | |
281 | of the corresponding entry in the procedure linkage table, | |
282 | plus the desired section offset. | |
283 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 284 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
285 | for this symbol in the executable file, so we skip it. */ |
286 | symaddr = sym->value; | |
287 | if (symaddr == 0) | |
288 | continue; | |
02c75f72 UW |
289 | |
290 | /* sym->section is the undefined section. However, we want to | |
291 | record the section where the PLT stub resides with the | |
292 | minimal symbol. Search the section table for the one that | |
293 | covers the stub's address. */ | |
294 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
295 | { | |
296 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
297 | continue; | |
298 | ||
299 | if (symaddr >= bfd_get_section_vma (abfd, sect) | |
300 | && symaddr < bfd_get_section_vma (abfd, sect) | |
301 | + bfd_get_section_size (sect)) | |
302 | break; | |
303 | } | |
304 | if (!sect) | |
305 | continue; | |
306 | ||
828cfa8d JB |
307 | /* On ia64-hpux, we have discovered that the system linker |
308 | adds undefined symbols with nonzero addresses that cannot | |
309 | be right (their address points inside the code of another | |
310 | function in the .text section). This creates problems | |
311 | when trying to determine which symbol corresponds to | |
312 | a given address. | |
313 | ||
314 | We try to detect those buggy symbols by checking which | |
315 | section we think they correspond to. Normally, PLT symbols | |
316 | are stored inside their own section, and the typical name | |
317 | for that section is ".plt". So, if there is a ".plt" | |
318 | section, and yet the section name of our symbol does not | |
319 | start with ".plt", we ignore that symbol. */ | |
320 | if (strncmp (sect->name, ".plt", 4) != 0 | |
321 | && bfd_get_section_by_name (abfd, ".plt") != NULL) | |
322 | continue; | |
323 | ||
02c75f72 UW |
324 | symaddr += ANOFFSET (objfile->section_offsets, sect->index); |
325 | ||
0cc7b392 | 326 | msym = record_minimal_symbol |
04a679b8 TT |
327 | (sym->name, strlen (sym->name), copy_names, |
328 | symaddr, mst_solib_trampoline, sect, objfile); | |
0cc7b392 DJ |
329 | if (msym != NULL) |
330 | msym->filename = filesymname; | |
0cc7b392 DJ |
331 | continue; |
332 | } | |
c906108c | 333 | |
0cc7b392 DJ |
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. */ | |
6f610d07 | 337 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
338 | continue; |
339 | if (sym->flags & BSF_FILE) | |
340 | { | |
341 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
342 | Chain any old one onto the objfile; remember new sym. */ | |
343 | if (sectinfo != NULL) | |
c906108c | 344 | { |
0cc7b392 DJ |
345 | sectinfo->next = dbx->stab_section_info; |
346 | dbx->stab_section_info = sectinfo; | |
347 | sectinfo = NULL; | |
348 | } | |
349 | filesym = sym; | |
0af1e9a5 TT |
350 | filesymname = bcache (filesym->name, strlen (filesym->name) + 1, |
351 | objfile->filename_cache); | |
0cc7b392 DJ |
352 | } |
353 | else if (sym->flags & BSF_SECTION_SYM) | |
354 | continue; | |
355 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) | |
356 | { | |
357 | struct minimal_symbol *msym; | |
358 | ||
359 | /* Select global/local/weak symbols. Note that bfd puts abs | |
360 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
361 | interested in will have a section. */ |
362 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 363 | symaddr = sym->value + sym->section->vma; |
45148c2e UW |
364 | /* Relocate all non-absolute and non-TLS symbols by the |
365 | section offset. */ | |
366 | if (sym->section != &bfd_abs_section | |
367 | && !(sym->section->flags & SEC_THREAD_LOCAL)) | |
0cc7b392 DJ |
368 | { |
369 | symaddr += offset; | |
c906108c | 370 | } |
0cc7b392 DJ |
371 | /* For non-absolute symbols, use the type of the section |
372 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 373 | no way of figuring this out for absolute symbols. */ |
0cc7b392 | 374 | if (sym->section == &bfd_abs_section) |
c906108c | 375 | { |
0cc7b392 DJ |
376 | /* This is a hack to get the minimal symbol type |
377 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
378 | with special section indices for dynamic symbols. |
379 | ||
380 | NOTE: uweigand-20071112: Synthetic symbols do not | |
381 | have an ELF-private part, so do not touch those. */ | |
dea91a5c | 382 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
0cc7b392 DJ |
383 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
384 | ||
385 | switch (shndx) | |
c906108c | 386 | { |
0cc7b392 DJ |
387 | case SHN_MIPS_TEXT: |
388 | ms_type = mst_text; | |
389 | break; | |
390 | case SHN_MIPS_DATA: | |
391 | ms_type = mst_data; | |
392 | break; | |
393 | case SHN_MIPS_ACOMMON: | |
394 | ms_type = mst_bss; | |
395 | break; | |
396 | default: | |
397 | ms_type = mst_abs; | |
398 | } | |
399 | ||
400 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 401 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
402 | if (ms_type != mst_abs) |
403 | { | |
404 | if (sym->name[0] == '.') | |
405 | continue; | |
d4f3574e | 406 | symaddr += offset; |
c906108c | 407 | } |
0cc7b392 DJ |
408 | } |
409 | else if (sym->section->flags & SEC_CODE) | |
410 | { | |
08232497 | 411 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
c906108c | 412 | { |
0875794a JK |
413 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
414 | ms_type = mst_text_gnu_ifunc; | |
415 | else | |
416 | ms_type = mst_text; | |
0cc7b392 | 417 | } |
90359a16 JK |
418 | /* The BSF_SYNTHETIC check is there to omit ppc64 function |
419 | descriptors mistaken for static functions starting with 'L'. | |
420 | */ | |
421 | else if ((sym->name[0] == '.' && sym->name[1] == 'L' | |
422 | && (sym->flags & BSF_SYNTHETIC) == 0) | |
0cc7b392 DJ |
423 | || ((sym->flags & BSF_LOCAL) |
424 | && sym->name[0] == '$' | |
425 | && sym->name[1] == 'L')) | |
426 | /* Looks like a compiler-generated label. Skip | |
427 | it. The assembler should be skipping these (to | |
428 | keep executables small), but apparently with | |
429 | gcc on the (deleted) delta m88k SVR4, it loses. | |
430 | So to have us check too should be harmless (but | |
431 | I encourage people to fix this in the assembler | |
432 | instead of adding checks here). */ | |
433 | continue; | |
434 | else | |
435 | { | |
436 | ms_type = mst_file_text; | |
c906108c | 437 | } |
0cc7b392 DJ |
438 | } |
439 | else if (sym->section->flags & SEC_ALLOC) | |
440 | { | |
441 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) | |
c906108c | 442 | { |
0cc7b392 | 443 | if (sym->section->flags & SEC_LOAD) |
c906108c | 444 | { |
0cc7b392 | 445 | ms_type = mst_data; |
c906108c | 446 | } |
c906108c SS |
447 | else |
448 | { | |
0cc7b392 | 449 | ms_type = mst_bss; |
c906108c SS |
450 | } |
451 | } | |
0cc7b392 | 452 | else if (sym->flags & BSF_LOCAL) |
c906108c | 453 | { |
0cc7b392 DJ |
454 | /* Named Local variable in a Data section. |
455 | Check its name for stabs-in-elf. */ | |
456 | int special_local_sect; | |
d7f9d729 | 457 | |
0cc7b392 DJ |
458 | if (strcmp ("Bbss.bss", sym->name) == 0) |
459 | special_local_sect = SECT_OFF_BSS (objfile); | |
460 | else if (strcmp ("Ddata.data", sym->name) == 0) | |
461 | special_local_sect = SECT_OFF_DATA (objfile); | |
462 | else if (strcmp ("Drodata.rodata", sym->name) == 0) | |
463 | special_local_sect = SECT_OFF_RODATA (objfile); | |
464 | else | |
465 | special_local_sect = -1; | |
466 | if (special_local_sect >= 0) | |
c906108c | 467 | { |
0cc7b392 DJ |
468 | /* Found a special local symbol. Allocate a |
469 | sectinfo, if needed, and fill it in. */ | |
470 | if (sectinfo == NULL) | |
c906108c | 471 | { |
0cc7b392 DJ |
472 | int max_index; |
473 | size_t size; | |
474 | ||
25c2f6ab PP |
475 | max_index = SECT_OFF_BSS (objfile); |
476 | if (objfile->sect_index_data > max_index) | |
477 | max_index = objfile->sect_index_data; | |
478 | if (objfile->sect_index_rodata > max_index) | |
479 | max_index = objfile->sect_index_rodata; | |
0cc7b392 DJ |
480 | |
481 | /* max_index is the largest index we'll | |
482 | use into this array, so we must | |
483 | allocate max_index+1 elements for it. | |
484 | However, 'struct stab_section_info' | |
485 | already includes one element, so we | |
486 | need to allocate max_index aadditional | |
487 | elements. */ | |
dea91a5c | 488 | size = (sizeof (struct stab_section_info) |
c05d19c5 | 489 | + (sizeof (CORE_ADDR) * max_index)); |
0cc7b392 DJ |
490 | sectinfo = (struct stab_section_info *) |
491 | xmalloc (size); | |
492 | memset (sectinfo, 0, size); | |
493 | sectinfo->num_sections = max_index; | |
494 | if (filesym == NULL) | |
c906108c | 495 | { |
0cc7b392 | 496 | complaint (&symfile_complaints, |
3e43a32a MS |
497 | _("elf/stab section information %s " |
498 | "without a preceding file symbol"), | |
0cc7b392 DJ |
499 | sym->name); |
500 | } | |
501 | else | |
502 | { | |
503 | sectinfo->filename = | |
504 | (char *) filesym->name; | |
c906108c | 505 | } |
c906108c | 506 | } |
0cc7b392 DJ |
507 | if (sectinfo->sections[special_local_sect] != 0) |
508 | complaint (&symfile_complaints, | |
3e43a32a MS |
509 | _("duplicated elf/stab section " |
510 | "information for %s"), | |
0cc7b392 DJ |
511 | sectinfo->filename); |
512 | /* BFD symbols are section relative. */ | |
513 | symaddr = sym->value + sym->section->vma; | |
514 | /* Relocate non-absolute symbols by the | |
515 | section offset. */ | |
516 | if (sym->section != &bfd_abs_section) | |
517 | symaddr += offset; | |
518 | sectinfo->sections[special_local_sect] = symaddr; | |
519 | /* The special local symbols don't go in the | |
520 | minimal symbol table, so ignore this one. */ | |
521 | continue; | |
522 | } | |
523 | /* Not a special stabs-in-elf symbol, do regular | |
524 | symbol processing. */ | |
525 | if (sym->section->flags & SEC_LOAD) | |
526 | { | |
527 | ms_type = mst_file_data; | |
c906108c SS |
528 | } |
529 | else | |
530 | { | |
0cc7b392 | 531 | ms_type = mst_file_bss; |
c906108c SS |
532 | } |
533 | } | |
534 | else | |
535 | { | |
0cc7b392 | 536 | ms_type = mst_unknown; |
c906108c | 537 | } |
0cc7b392 DJ |
538 | } |
539 | else | |
540 | { | |
541 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 542 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
543 | hob with actions like finding what function the PC |
544 | is in. Ignore them if they aren't text, data, or bss. */ | |
545 | /* ms_type = mst_unknown; */ | |
0963b4bd | 546 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
547 | } |
548 | msym = record_minimal_symbol | |
04a679b8 | 549 | (sym->name, strlen (sym->name), copy_names, symaddr, |
0cc7b392 | 550 | ms_type, sym->section, objfile); |
6f610d07 | 551 | |
0cc7b392 DJ |
552 | if (msym) |
553 | { | |
554 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
6f610d07 UW |
555 | elf_symbol_type *elf_sym; |
556 | ||
557 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an | |
558 | ELF-private part. However, in some cases (e.g. synthetic | |
559 | 'dot' symbols on ppc64) the udata.p entry is set to point back | |
560 | to the original ELF symbol it was derived from. Get the size | |
dea91a5c | 561 | from that symbol. */ |
6f610d07 UW |
562 | if (type != ST_SYNTHETIC) |
563 | elf_sym = (elf_symbol_type *) sym; | |
564 | else | |
565 | elf_sym = (elf_symbol_type *) sym->udata.p; | |
566 | ||
567 | if (elf_sym) | |
568 | MSYMBOL_SIZE(msym) = elf_sym->internal_elf_sym.st_size; | |
dea91a5c | 569 | |
a103a963 DJ |
570 | msym->filename = filesymname; |
571 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 572 | } |
2eaf8d2a DJ |
573 | |
574 | /* For @plt symbols, also record a trampoline to the | |
575 | destination symbol. The @plt symbol will be used in | |
576 | disassembly, and the trampoline will be used when we are | |
577 | trying to find the target. */ | |
578 | if (msym && ms_type == mst_text && type == ST_SYNTHETIC) | |
579 | { | |
580 | int len = strlen (sym->name); | |
581 | ||
582 | if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0) | |
583 | { | |
2eaf8d2a DJ |
584 | struct minimal_symbol *mtramp; |
585 | ||
04a679b8 TT |
586 | mtramp = record_minimal_symbol (sym->name, len - 4, 1, |
587 | symaddr, | |
2eaf8d2a DJ |
588 | mst_solib_trampoline, |
589 | sym->section, objfile); | |
590 | if (mtramp) | |
591 | { | |
592 | MSYMBOL_SIZE (mtramp) = MSYMBOL_SIZE (msym); | |
593 | mtramp->filename = filesymname; | |
594 | gdbarch_elf_make_msymbol_special (gdbarch, sym, mtramp); | |
595 | } | |
596 | } | |
597 | } | |
c906108c | 598 | } |
c906108c SS |
599 | } |
600 | } | |
601 | ||
07be84bf JK |
602 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
603 | for later look ups of which function to call when user requests | |
604 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
605 | library defining `function' we cannot yet know while reading OBJFILE which | |
606 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
607 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
608 | ||
609 | static void | |
610 | elf_rel_plt_read (struct objfile *objfile, asymbol **dyn_symbol_table) | |
611 | { | |
612 | bfd *obfd = objfile->obfd; | |
613 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); | |
614 | asection *plt, *relplt, *got_plt; | |
615 | unsigned u; | |
616 | int plt_elf_idx; | |
617 | bfd_size_type reloc_count, reloc; | |
618 | char *string_buffer = NULL; | |
619 | size_t string_buffer_size = 0; | |
620 | struct cleanup *back_to; | |
621 | struct gdbarch *gdbarch = objfile->gdbarch; | |
622 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; | |
623 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
624 | ||
625 | if (objfile->separate_debug_objfile_backlink) | |
626 | return; | |
627 | ||
628 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
629 | if (plt == NULL) | |
630 | return; | |
631 | plt_elf_idx = elf_section_data (plt)->this_idx; | |
632 | ||
633 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); | |
634 | if (got_plt == NULL) | |
635 | return; | |
636 | ||
637 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ | |
638 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
639 | if (elf_section_data (relplt)->this_hdr.sh_info == plt_elf_idx | |
640 | && (elf_section_data (relplt)->this_hdr.sh_type == SHT_REL | |
641 | || elf_section_data (relplt)->this_hdr.sh_type == SHT_RELA)) | |
642 | break; | |
643 | if (relplt == NULL) | |
644 | return; | |
645 | ||
646 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
647 | return; | |
648 | ||
649 | back_to = make_cleanup (free_current_contents, &string_buffer); | |
650 | ||
651 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; | |
652 | for (reloc = 0; reloc < reloc_count; reloc++) | |
653 | { | |
654 | const char *name, *name_got_plt; | |
655 | struct minimal_symbol *msym; | |
656 | CORE_ADDR address; | |
657 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); | |
658 | size_t name_len; | |
659 | ||
660 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
661 | name_len = strlen (name); | |
662 | address = relplt->relocation[reloc].address; | |
663 | ||
664 | /* Does the pointer reside in the .got.plt section? */ | |
665 | if (!(bfd_get_section_vma (obfd, got_plt) <= address | |
666 | && address < bfd_get_section_vma (obfd, got_plt) | |
667 | + bfd_get_section_size (got_plt))) | |
668 | continue; | |
669 | ||
670 | /* We cannot check if NAME is a reference to mst_text_gnu_ifunc as in | |
671 | OBJFILE the symbol is undefined and the objfile having NAME defined | |
672 | may not yet have been loaded. */ | |
673 | ||
3807f613 | 674 | if (string_buffer_size < name_len + got_suffix_len + 1) |
07be84bf JK |
675 | { |
676 | string_buffer_size = 2 * (name_len + got_suffix_len); | |
677 | string_buffer = xrealloc (string_buffer, string_buffer_size); | |
678 | } | |
679 | memcpy (string_buffer, name, name_len); | |
680 | memcpy (&string_buffer[name_len], SYMBOL_GOT_PLT_SUFFIX, | |
3807f613 | 681 | got_suffix_len + 1); |
07be84bf JK |
682 | |
683 | msym = record_minimal_symbol (string_buffer, name_len + got_suffix_len, | |
684 | 1, address, mst_slot_got_plt, got_plt, | |
685 | objfile); | |
686 | if (msym) | |
687 | MSYMBOL_SIZE (msym) = ptr_size; | |
688 | } | |
689 | ||
690 | do_cleanups (back_to); | |
691 | } | |
692 | ||
693 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
694 | ||
695 | static const struct objfile_data *elf_objfile_gnu_ifunc_cache_data; | |
696 | ||
697 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
698 | ||
699 | struct elf_gnu_ifunc_cache | |
700 | { | |
701 | /* This is always a function entry address, not a function descriptor. */ | |
702 | CORE_ADDR addr; | |
703 | ||
704 | char name[1]; | |
705 | }; | |
706 | ||
707 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
708 | ||
709 | static hashval_t | |
710 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
711 | { | |
712 | const struct elf_gnu_ifunc_cache *a = a_voidp; | |
713 | ||
714 | return htab_hash_string (a->name); | |
715 | } | |
716 | ||
717 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
718 | ||
719 | static int | |
720 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
721 | { | |
722 | const struct elf_gnu_ifunc_cache *a = a_voidp; | |
723 | const struct elf_gnu_ifunc_cache *b = b_voidp; | |
724 | ||
725 | return strcmp (a->name, b->name) == 0; | |
726 | } | |
727 | ||
728 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
729 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
730 | valid and therefore they were successfully recorded, return 0 otherwise. | |
731 | ||
732 | Function does not expect a duplicate entry. Use | |
733 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
734 | exists. */ | |
735 | ||
736 | static int | |
737 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
738 | { | |
739 | struct minimal_symbol *msym; | |
740 | asection *sect; | |
741 | struct objfile *objfile; | |
742 | htab_t htab; | |
743 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
744 | void **slot; | |
745 | ||
746 | msym = lookup_minimal_symbol_by_pc (addr); | |
747 | if (msym == NULL) | |
748 | return 0; | |
749 | if (SYMBOL_VALUE_ADDRESS (msym) != addr) | |
750 | return 0; | |
751 | /* minimal symbols have always SYMBOL_OBJ_SECTION non-NULL. */ | |
752 | sect = SYMBOL_OBJ_SECTION (msym)->the_bfd_section; | |
753 | objfile = SYMBOL_OBJ_SECTION (msym)->objfile; | |
754 | ||
755 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
756 | resolution and it has no use for GDB. Besides ".text" this symbol can | |
757 | reside also in ".opd" for ppc64 function descriptor. */ | |
758 | if (strcmp (bfd_get_section_name (objfile->obfd, sect), ".plt") == 0) | |
759 | return 0; | |
760 | ||
761 | htab = objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data); | |
762 | if (htab == NULL) | |
763 | { | |
764 | htab = htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash, | |
765 | elf_gnu_ifunc_cache_eq, | |
766 | NULL, &objfile->objfile_obstack, | |
767 | hashtab_obstack_allocate, | |
768 | dummy_obstack_deallocate); | |
769 | set_objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data, htab); | |
770 | } | |
771 | ||
772 | entry_local.addr = addr; | |
773 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
774 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
775 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
776 | entry_p = obstack_finish (&objfile->objfile_obstack); | |
777 | ||
778 | slot = htab_find_slot (htab, entry_p, INSERT); | |
779 | if (*slot != NULL) | |
780 | { | |
781 | struct elf_gnu_ifunc_cache *entry_found_p = *slot; | |
782 | struct gdbarch *gdbarch = objfile->gdbarch; | |
783 | ||
784 | if (entry_found_p->addr != addr) | |
785 | { | |
786 | /* This case indicates buggy inferior program, the resolved address | |
787 | should never change. */ | |
788 | ||
789 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
790 | "function_address from %s to %s"), | |
791 | name, paddress (gdbarch, entry_found_p->addr), | |
792 | paddress (gdbarch, addr)); | |
793 | } | |
794 | ||
795 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
796 | } | |
797 | *slot = entry_p; | |
798 | ||
799 | return 1; | |
800 | } | |
801 | ||
802 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
803 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
804 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
805 | ||
806 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
807 | function. */ | |
808 | ||
809 | static int | |
810 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
811 | { | |
812 | struct objfile *objfile; | |
813 | ||
814 | ALL_PSPACE_OBJFILES (current_program_space, objfile) | |
815 | { | |
816 | htab_t htab; | |
817 | struct elf_gnu_ifunc_cache *entry_p; | |
818 | void **slot; | |
819 | ||
820 | htab = objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data); | |
821 | if (htab == NULL) | |
822 | continue; | |
823 | ||
824 | entry_p = alloca (sizeof (*entry_p) + strlen (name)); | |
825 | strcpy (entry_p->name, name); | |
826 | ||
827 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
828 | if (slot == NULL) | |
829 | continue; | |
830 | entry_p = *slot; | |
831 | gdb_assert (entry_p != NULL); | |
832 | ||
833 | if (addr_p) | |
834 | *addr_p = entry_p->addr; | |
835 | return 1; | |
836 | } | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
842 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
843 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
844 | ||
845 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
846 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
847 | prevent cache entries duplicates. */ | |
848 | ||
849 | static int | |
850 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
851 | { | |
852 | char *name_got_plt; | |
853 | struct objfile *objfile; | |
854 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); | |
855 | ||
856 | name_got_plt = alloca (strlen (name) + got_suffix_len + 1); | |
857 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); | |
858 | ||
859 | ALL_PSPACE_OBJFILES (current_program_space, objfile) | |
860 | { | |
861 | bfd *obfd = objfile->obfd; | |
862 | struct gdbarch *gdbarch = objfile->gdbarch; | |
863 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; | |
864 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
865 | CORE_ADDR pointer_address, addr; | |
866 | asection *plt; | |
867 | gdb_byte *buf = alloca (ptr_size); | |
868 | struct minimal_symbol *msym; | |
869 | ||
870 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
871 | if (msym == NULL) | |
872 | continue; | |
873 | if (MSYMBOL_TYPE (msym) != mst_slot_got_plt) | |
874 | continue; | |
875 | pointer_address = SYMBOL_VALUE_ADDRESS (msym); | |
876 | ||
877 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
878 | if (plt == NULL) | |
879 | continue; | |
880 | ||
881 | if (MSYMBOL_SIZE (msym) != ptr_size) | |
882 | continue; | |
883 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
884 | continue; | |
885 | addr = extract_typed_address (buf, ptr_type); | |
886 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, | |
887 | ¤t_target); | |
888 | ||
889 | if (addr_p) | |
890 | *addr_p = addr; | |
891 | if (elf_gnu_ifunc_record_cache (name, addr)) | |
892 | return 1; | |
893 | } | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
899 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
900 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
901 | ||
902 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
903 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
904 | ||
905 | static int | |
906 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) | |
907 | { | |
908 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
909 | return 1; | |
dea91a5c | 910 | |
07be84bf JK |
911 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
912 | return 1; | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
918 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
919 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
920 | */ | |
921 | ||
922 | static CORE_ADDR | |
923 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
924 | { | |
925 | char *name_at_pc; | |
926 | CORE_ADDR start_at_pc, address; | |
927 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
928 | struct value *function, *address_val; | |
929 | ||
930 | /* Try first any non-intrusive methods without an inferior call. */ | |
931 | ||
932 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
933 | && start_at_pc == pc) | |
934 | { | |
935 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
936 | return address; | |
937 | } | |
938 | else | |
939 | name_at_pc = NULL; | |
940 | ||
941 | function = allocate_value (func_func_type); | |
942 | set_value_address (function, pc); | |
943 | ||
944 | /* STT_GNU_IFUNC resolver functions have no parameters. FUNCTION is the | |
945 | function entry address. ADDRESS may be a function descriptor. */ | |
946 | ||
947 | address_val = call_function_by_hand (function, 0, NULL); | |
948 | address = value_as_address (address_val); | |
949 | address = gdbarch_convert_from_func_ptr_addr (gdbarch, address, | |
950 | ¤t_target); | |
951 | ||
952 | if (name_at_pc) | |
953 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
954 | ||
955 | return address; | |
956 | } | |
957 | ||
0e30163f JK |
958 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
959 | ||
960 | static void | |
961 | elf_gnu_ifunc_resolver_stop (struct breakpoint *b) | |
962 | { | |
963 | struct breakpoint *b_return; | |
964 | struct frame_info *prev_frame = get_prev_frame (get_current_frame ()); | |
965 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); | |
966 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
967 | int thread_id = pid_to_thread_id (inferior_ptid); | |
968 | ||
969 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
970 | ||
971 | for (b_return = b->related_breakpoint; b_return != b; | |
972 | b_return = b_return->related_breakpoint) | |
973 | { | |
974 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
975 | gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL); | |
976 | gdb_assert (frame_id_p (b_return->frame_id)); | |
977 | ||
978 | if (b_return->thread == thread_id | |
979 | && b_return->loc->requested_address == prev_pc | |
980 | && frame_id_eq (b_return->frame_id, prev_frame_id)) | |
981 | break; | |
982 | } | |
983 | ||
984 | if (b_return == b) | |
985 | { | |
986 | struct symtab_and_line sal; | |
987 | ||
988 | /* No need to call find_pc_line for symbols resolving as this is only | |
989 | a helper breakpointer never shown to the user. */ | |
990 | ||
991 | init_sal (&sal); | |
992 | sal.pspace = current_inferior ()->pspace; | |
993 | sal.pc = prev_pc; | |
994 | sal.section = find_pc_overlay (sal.pc); | |
995 | sal.explicit_pc = 1; | |
996 | b_return = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
997 | prev_frame_id, | |
998 | bp_gnu_ifunc_resolver_return); | |
999 | ||
1000 | /* Add new b_return to the ring list b->related_breakpoint. */ | |
1001 | gdb_assert (b_return->related_breakpoint == b_return); | |
1002 | b_return->related_breakpoint = b->related_breakpoint; | |
1003 | b->related_breakpoint = b_return; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
1008 | ||
1009 | static void | |
1010 | elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b) | |
1011 | { | |
1012 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
1013 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
1014 | struct type *value_type = TYPE_TARGET_TYPE (func_func_type); | |
1015 | struct regcache *regcache = get_thread_regcache (inferior_ptid); | |
1016 | struct value *value; | |
1017 | CORE_ADDR resolved_address, resolved_pc; | |
1018 | struct symtab_and_line sal; | |
f1310107 | 1019 | struct symtabs_and_lines sals, sals_end; |
0e30163f JK |
1020 | |
1021 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
1022 | ||
1023 | value = allocate_value (value_type); | |
1024 | gdbarch_return_value (gdbarch, func_func_type, value_type, regcache, | |
1025 | value_contents_raw (value), NULL); | |
1026 | resolved_address = value_as_address (value); | |
1027 | resolved_pc = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
1028 | resolved_address, | |
1029 | ¤t_target); | |
1030 | ||
1031 | while (b->related_breakpoint != b) | |
1032 | { | |
1033 | struct breakpoint *b_next = b->related_breakpoint; | |
1034 | ||
1035 | switch (b->type) | |
1036 | { | |
1037 | case bp_gnu_ifunc_resolver: | |
1038 | break; | |
1039 | case bp_gnu_ifunc_resolver_return: | |
1040 | delete_breakpoint (b); | |
1041 | break; | |
1042 | default: | |
1043 | internal_error (__FILE__, __LINE__, | |
1044 | _("handle_inferior_event: Invalid " | |
1045 | "gnu-indirect-function breakpoint type %d"), | |
1046 | (int) b->type); | |
1047 | } | |
1048 | b = b_next; | |
1049 | } | |
1050 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
1051 | ||
f8eba3c6 | 1052 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
0e30163f JK |
1053 | elf_gnu_ifunc_record_cache (b->addr_string, resolved_pc); |
1054 | ||
1055 | sal = find_pc_line (resolved_pc, 0); | |
1056 | sals.nelts = 1; | |
1057 | sals.sals = &sal; | |
f1310107 | 1058 | sals_end.nelts = 0; |
0e30163f JK |
1059 | |
1060 | b->type = bp_breakpoint; | |
f1310107 | 1061 | update_breakpoint_locations (b, sals, sals_end); |
0e30163f JK |
1062 | } |
1063 | ||
874f5765 TG |
1064 | struct build_id |
1065 | { | |
1066 | size_t size; | |
1067 | gdb_byte data[1]; | |
1068 | }; | |
1069 | ||
1070 | /* Locate NT_GNU_BUILD_ID from ABFD and return its content. */ | |
1071 | ||
1072 | static struct build_id * | |
1073 | build_id_bfd_get (bfd *abfd) | |
1074 | { | |
1075 | struct build_id *retval; | |
1076 | ||
1077 | if (!bfd_check_format (abfd, bfd_object) | |
1078 | || bfd_get_flavour (abfd) != bfd_target_elf_flavour | |
1079 | || elf_tdata (abfd)->build_id == NULL) | |
1080 | return NULL; | |
1081 | ||
1082 | retval = xmalloc (sizeof *retval - 1 + elf_tdata (abfd)->build_id_size); | |
1083 | retval->size = elf_tdata (abfd)->build_id_size; | |
1084 | memcpy (retval->data, elf_tdata (abfd)->build_id, retval->size); | |
1085 | ||
1086 | return retval; | |
1087 | } | |
1088 | ||
1089 | /* Return if FILENAME has NT_GNU_BUILD_ID matching the CHECK value. */ | |
1090 | ||
1091 | static int | |
1092 | build_id_verify (const char *filename, struct build_id *check) | |
1093 | { | |
1094 | bfd *abfd; | |
1095 | struct build_id *found = NULL; | |
1096 | int retval = 0; | |
1097 | ||
1098 | /* We expect to be silent on the non-existing files. */ | |
1099 | abfd = bfd_open_maybe_remote (filename); | |
1100 | if (abfd == NULL) | |
1101 | return 0; | |
1102 | ||
1103 | found = build_id_bfd_get (abfd); | |
1104 | ||
1105 | if (found == NULL) | |
1106 | warning (_("File \"%s\" has no build-id, file skipped"), filename); | |
1107 | else if (found->size != check->size | |
1108 | || memcmp (found->data, check->data, found->size) != 0) | |
3e43a32a MS |
1109 | warning (_("File \"%s\" has a different build-id, file skipped"), |
1110 | filename); | |
874f5765 TG |
1111 | else |
1112 | retval = 1; | |
1113 | ||
516ba659 | 1114 | gdb_bfd_close_or_warn (abfd); |
874f5765 TG |
1115 | |
1116 | xfree (found); | |
1117 | ||
1118 | return retval; | |
1119 | } | |
1120 | ||
1121 | static char * | |
1122 | build_id_to_debug_filename (struct build_id *build_id) | |
1123 | { | |
1124 | char *link, *debugdir, *retval = NULL; | |
1125 | ||
1126 | /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */ | |
1127 | link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1 | |
1128 | + 2 * build_id->size + (sizeof ".debug" - 1) + 1); | |
1129 | ||
1130 | /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will | |
1131 | cause "/.build-id/..." lookups. */ | |
1132 | ||
1133 | debugdir = debug_file_directory; | |
1134 | do | |
1135 | { | |
1136 | char *s, *debugdir_end; | |
1137 | gdb_byte *data = build_id->data; | |
1138 | size_t size = build_id->size; | |
1139 | ||
1140 | while (*debugdir == DIRNAME_SEPARATOR) | |
1141 | debugdir++; | |
1142 | ||
1143 | debugdir_end = strchr (debugdir, DIRNAME_SEPARATOR); | |
1144 | if (debugdir_end == NULL) | |
1145 | debugdir_end = &debugdir[strlen (debugdir)]; | |
1146 | ||
1147 | memcpy (link, debugdir, debugdir_end - debugdir); | |
1148 | s = &link[debugdir_end - debugdir]; | |
1149 | s += sprintf (s, "/.build-id/"); | |
1150 | if (size > 0) | |
1151 | { | |
1152 | size--; | |
1153 | s += sprintf (s, "%02x", (unsigned) *data++); | |
1154 | } | |
1155 | if (size > 0) | |
1156 | *s++ = '/'; | |
1157 | while (size-- > 0) | |
1158 | s += sprintf (s, "%02x", (unsigned) *data++); | |
1159 | strcpy (s, ".debug"); | |
1160 | ||
1161 | /* lrealpath() is expensive even for the usually non-existent files. */ | |
1162 | if (access (link, F_OK) == 0) | |
1163 | retval = lrealpath (link); | |
1164 | ||
1165 | if (retval != NULL && !build_id_verify (retval, build_id)) | |
1166 | { | |
1167 | xfree (retval); | |
1168 | retval = NULL; | |
1169 | } | |
1170 | ||
1171 | if (retval != NULL) | |
1172 | break; | |
1173 | ||
1174 | debugdir = debugdir_end; | |
1175 | } | |
1176 | while (*debugdir != 0); | |
1177 | ||
1178 | return retval; | |
1179 | } | |
1180 | ||
1181 | static char * | |
1182 | find_separate_debug_file_by_buildid (struct objfile *objfile) | |
1183 | { | |
874f5765 TG |
1184 | struct build_id *build_id; |
1185 | ||
1186 | build_id = build_id_bfd_get (objfile->obfd); | |
1187 | if (build_id != NULL) | |
1188 | { | |
1189 | char *build_id_name; | |
1190 | ||
1191 | build_id_name = build_id_to_debug_filename (build_id); | |
1192 | xfree (build_id); | |
1193 | /* Prevent looping on a stripped .debug file. */ | |
0ba1096a KT |
1194 | if (build_id_name != NULL |
1195 | && filename_cmp (build_id_name, objfile->name) == 0) | |
874f5765 TG |
1196 | { |
1197 | warning (_("\"%s\": separate debug info file has no debug info"), | |
1198 | build_id_name); | |
1199 | xfree (build_id_name); | |
1200 | } | |
1201 | else if (build_id_name != NULL) | |
1202 | return build_id_name; | |
1203 | } | |
1204 | return NULL; | |
1205 | } | |
1206 | ||
c906108c | 1207 | /* Scan and build partial symbols for a symbol file. |
dea91a5c | 1208 | We have been initialized by a call to elf_symfile_init, which |
c906108c SS |
1209 | currently does nothing. |
1210 | ||
1211 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
1212 | in each section. We simplify it down to a single offset for all | |
1213 | symbols. FIXME. | |
1214 | ||
c906108c SS |
1215 | This function only does the minimum work necessary for letting the |
1216 | user "name" things symbolically; it does not read the entire symtab. | |
1217 | Instead, it reads the external and static symbols and puts them in partial | |
1218 | symbol tables. When more extensive information is requested of a | |
1219 | file, the corresponding partial symbol table is mutated into a full | |
1220 | fledged symbol table by going back and reading the symbols | |
1221 | for real. | |
1222 | ||
1223 | We look for sections with specific names, to tell us what debug | |
1224 | format to look for: FIXME!!! | |
1225 | ||
c906108c SS |
1226 | elfstab_build_psymtabs() handles STABS symbols; |
1227 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1228 | ||
1229 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1230 | like a COFF symbol table, but has only the minimal information necessary | |
1231 | for linking. We process this also, and use the information to | |
1232 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1233 | capability even for files compiled without -g. */ | |
1234 | ||
1235 | static void | |
f4352531 | 1236 | elf_symfile_read (struct objfile *objfile, int symfile_flags) |
c906108c | 1237 | { |
63524580 | 1238 | bfd *synth_abfd, *abfd = objfile->obfd; |
c906108c SS |
1239 | struct elfinfo ei; |
1240 | struct cleanup *back_to; | |
62553543 EZ |
1241 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1242 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1243 | asymbol *synthsyms; | |
c906108c SS |
1244 | |
1245 | init_minimal_symbol_collection (); | |
56e290f4 | 1246 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
1247 | |
1248 | memset ((char *) &ei, 0, sizeof (ei)); | |
1249 | ||
0963b4bd | 1250 | /* Allocate struct to keep track of the symfile. */ |
0a6ddd08 | 1251 | objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *) |
7936743b | 1252 | xmalloc (sizeof (struct dbx_symfile_info)); |
3e43a32a MS |
1253 | memset ((char *) objfile->deprecated_sym_stab_info, |
1254 | 0, sizeof (struct dbx_symfile_info)); | |
12b9c64f | 1255 | make_cleanup (free_elfinfo, (void *) objfile); |
c906108c | 1256 | |
3e43a32a MS |
1257 | /* Process the normal ELF symbol table first. This may write some |
1258 | chain of info into the dbx_symfile_info in | |
1259 | objfile->deprecated_sym_stab_info, which can later be used by | |
1260 | elfstab_offset_sections. */ | |
c906108c | 1261 | |
62553543 EZ |
1262 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
1263 | if (storage_needed < 0) | |
3e43a32a MS |
1264 | error (_("Can't read symbols from %s: %s"), |
1265 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1266 | bfd_errmsg (bfd_get_error ())); |
1267 | ||
1268 | if (storage_needed > 0) | |
1269 | { | |
1270 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
1271 | make_cleanup (xfree, symbol_table); | |
1272 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); | |
1273 | ||
1274 | if (symcount < 0) | |
3e43a32a MS |
1275 | error (_("Can't read symbols from %s: %s"), |
1276 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1277 | bfd_errmsg (bfd_get_error ())); |
1278 | ||
04a679b8 | 1279 | elf_symtab_read (objfile, ST_REGULAR, symcount, symbol_table, 0); |
62553543 | 1280 | } |
c906108c SS |
1281 | |
1282 | /* Add the dynamic symbols. */ | |
1283 | ||
62553543 EZ |
1284 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
1285 | ||
1286 | if (storage_needed > 0) | |
1287 | { | |
3f1eff0a JK |
1288 | /* Memory gets permanently referenced from ABFD after |
1289 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1290 | It happens only in the case when elf_slurp_reloc_table sees | |
1291 | asection->relocation NULL. Determining which section is asection is | |
1292 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1293 | implementation detail, though. */ | |
1294 | ||
1295 | dyn_symbol_table = bfd_alloc (abfd, storage_needed); | |
62553543 EZ |
1296 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
1297 | dyn_symbol_table); | |
1298 | ||
1299 | if (dynsymcount < 0) | |
3e43a32a MS |
1300 | error (_("Can't read symbols from %s: %s"), |
1301 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1302 | bfd_errmsg (bfd_get_error ())); |
1303 | ||
04a679b8 | 1304 | elf_symtab_read (objfile, ST_DYNAMIC, dynsymcount, dyn_symbol_table, 0); |
07be84bf JK |
1305 | |
1306 | elf_rel_plt_read (objfile, dyn_symbol_table); | |
62553543 EZ |
1307 | } |
1308 | ||
63524580 JK |
1309 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1310 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1311 | ||
1312 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1313 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1314 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1315 | read the code address from .opd while it reads the .symtab section from | |
1316 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1317 | ||
1318 | With SYNTH_ABFD the .opd section will be read from the original | |
1319 | backlinked binary where it is valid. */ | |
1320 | ||
1321 | if (objfile->separate_debug_objfile_backlink) | |
1322 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd; | |
1323 | else | |
1324 | synth_abfd = abfd; | |
1325 | ||
62553543 EZ |
1326 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1327 | ||
63524580 | 1328 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1329 | dynsymcount, dyn_symbol_table, |
1330 | &synthsyms); | |
1331 | if (synthcount > 0) | |
1332 | { | |
1333 | asymbol **synth_symbol_table; | |
1334 | long i; | |
1335 | ||
1336 | make_cleanup (xfree, synthsyms); | |
1337 | synth_symbol_table = xmalloc (sizeof (asymbol *) * synthcount); | |
1338 | for (i = 0; i < synthcount; i++) | |
9f20e3da | 1339 | synth_symbol_table[i] = synthsyms + i; |
62553543 | 1340 | make_cleanup (xfree, synth_symbol_table); |
3e43a32a MS |
1341 | elf_symtab_read (objfile, ST_SYNTHETIC, synthcount, |
1342 | synth_symbol_table, 1); | |
62553543 | 1343 | } |
c906108c | 1344 | |
7134143f DJ |
1345 | /* Install any minimal symbols that have been collected as the current |
1346 | minimal symbols for this objfile. The debug readers below this point | |
1347 | should not generate new minimal symbols; if they do it's their | |
1348 | responsibility to install them. "mdebug" appears to be the only one | |
1349 | which will do this. */ | |
1350 | ||
1351 | install_minimal_symbols (objfile); | |
1352 | do_cleanups (back_to); | |
1353 | ||
c906108c | 1354 | /* Now process debugging information, which is contained in |
0963b4bd | 1355 | special ELF sections. */ |
c906108c | 1356 | |
0963b4bd | 1357 | /* We first have to find them... */ |
12b9c64f | 1358 | bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); |
c906108c SS |
1359 | |
1360 | /* ELF debugging information is inserted into the psymtab in the | |
1361 | order of least informative first - most informative last. Since | |
1362 | the psymtab table is searched `most recent insertion first' this | |
1363 | increases the probability that more detailed debug information | |
1364 | for a section is found. | |
1365 | ||
1366 | For instance, an object file might contain both .mdebug (XCOFF) | |
1367 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1368 | (searched last) and DWARF2 is inserted last (searched first). If | |
1369 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1370 | an included file XCOFF info is useless. */ |
c906108c SS |
1371 | |
1372 | if (ei.mdebugsect) | |
1373 | { | |
1374 | const struct ecoff_debug_swap *swap; | |
1375 | ||
1376 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 1377 | information. */ |
c906108c SS |
1378 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1379 | if (swap) | |
d4f3574e | 1380 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1381 | } |
1382 | if (ei.stabsect) | |
1383 | { | |
1384 | asection *str_sect; | |
1385 | ||
1386 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 1387 | a separate section. */ |
c906108c SS |
1388 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1389 | ||
1390 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1391 | if (str_sect) | |
1392 | elfstab_build_psymtabs (objfile, | |
086df311 | 1393 | ei.stabsect, |
c906108c SS |
1394 | str_sect->filepos, |
1395 | bfd_section_size (abfd, str_sect)); | |
1396 | } | |
9291a0cd | 1397 | |
251d32d9 | 1398 | if (dwarf2_has_info (objfile, NULL)) |
b11896a5 | 1399 | { |
3e03848b JK |
1400 | /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF debug |
1401 | information present in OBJFILE. If there is such debug info present | |
1402 | never use .gdb_index. */ | |
1403 | ||
1404 | if (!objfile_has_partial_symbols (objfile) | |
1405 | && dwarf2_initialize_objfile (objfile)) | |
b11896a5 TT |
1406 | objfile->sf = &elf_sym_fns_gdb_index; |
1407 | else | |
1408 | { | |
1409 | /* It is ok to do this even if the stabs reader made some | |
1410 | partial symbols, because OBJF_PSYMTABS_READ has not been | |
1411 | set, and so our lazy reader function will still be called | |
1412 | when needed. */ | |
1413 | objfile->sf = &elf_sym_fns_lazy_psyms; | |
1414 | } | |
1415 | } | |
3e43a32a MS |
1416 | /* If the file has its own symbol tables it has no separate debug |
1417 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1418 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
1419 | `.note.gnu.build-id'. */ | |
b11896a5 | 1420 | else if (!objfile_has_partial_symbols (objfile)) |
9cce227f TG |
1421 | { |
1422 | char *debugfile; | |
1423 | ||
1424 | debugfile = find_separate_debug_file_by_buildid (objfile); | |
1425 | ||
1426 | if (debugfile == NULL) | |
1427 | debugfile = find_separate_debug_file_by_debuglink (objfile); | |
1428 | ||
1429 | if (debugfile) | |
1430 | { | |
1431 | bfd *abfd = symfile_bfd_open (debugfile); | |
d7f9d729 | 1432 | |
9cce227f TG |
1433 | symbol_file_add_separate (abfd, symfile_flags, objfile); |
1434 | xfree (debugfile); | |
1435 | } | |
1436 | } | |
c906108c SS |
1437 | } |
1438 | ||
b11896a5 TT |
1439 | /* Callback to lazily read psymtabs. */ |
1440 | ||
1441 | static void | |
1442 | read_psyms (struct objfile *objfile) | |
1443 | { | |
251d32d9 | 1444 | if (dwarf2_has_info (objfile, NULL)) |
b11896a5 TT |
1445 | dwarf2_build_psymtabs (objfile); |
1446 | } | |
1447 | ||
0a6ddd08 AC |
1448 | /* This cleans up the objfile's deprecated_sym_stab_info pointer, and |
1449 | the chain of stab_section_info's, that might be dangling from | |
1450 | it. */ | |
c906108c SS |
1451 | |
1452 | static void | |
12b9c64f | 1453 | free_elfinfo (void *objp) |
c906108c | 1454 | { |
c5aa993b | 1455 | struct objfile *objfile = (struct objfile *) objp; |
0a6ddd08 | 1456 | struct dbx_symfile_info *dbxinfo = objfile->deprecated_sym_stab_info; |
c906108c SS |
1457 | struct stab_section_info *ssi, *nssi; |
1458 | ||
1459 | ssi = dbxinfo->stab_section_info; | |
1460 | while (ssi) | |
1461 | { | |
1462 | nssi = ssi->next; | |
2dc74dc1 | 1463 | xfree (ssi); |
c906108c SS |
1464 | ssi = nssi; |
1465 | } | |
1466 | ||
1467 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
1468 | } | |
1469 | ||
1470 | ||
1471 | /* Initialize anything that needs initializing when a completely new symbol | |
1472 | file is specified (not just adding some symbols from another file, e.g. a | |
1473 | shared library). | |
1474 | ||
3e43a32a MS |
1475 | We reinitialize buildsym, since we may be reading stabs from an ELF |
1476 | file. */ | |
c906108c SS |
1477 | |
1478 | static void | |
fba45db2 | 1479 | elf_new_init (struct objfile *ignore) |
c906108c SS |
1480 | { |
1481 | stabsread_new_init (); | |
1482 | buildsym_new_init (); | |
1483 | } | |
1484 | ||
1485 | /* Perform any local cleanups required when we are done with a particular | |
1486 | objfile. I.E, we are in the process of discarding all symbol information | |
1487 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1488 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1489 | |
1490 | static void | |
fba45db2 | 1491 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1492 | { |
0a6ddd08 | 1493 | if (objfile->deprecated_sym_stab_info != NULL) |
c906108c | 1494 | { |
0a6ddd08 | 1495 | xfree (objfile->deprecated_sym_stab_info); |
c906108c | 1496 | } |
fe3e1990 DJ |
1497 | |
1498 | dwarf2_free_objfile (objfile); | |
c906108c SS |
1499 | } |
1500 | ||
1501 | /* ELF specific initialization routine for reading symbols. | |
1502 | ||
1503 | It is passed a pointer to a struct sym_fns which contains, among other | |
1504 | things, the BFD for the file whose symbols are being read, and a slot for | |
1505 | a pointer to "private data" which we can fill with goodies. | |
1506 | ||
1507 | For now at least, we have nothing in particular to do, so this function is | |
0963b4bd | 1508 | just a stub. */ |
c906108c SS |
1509 | |
1510 | static void | |
fba45db2 | 1511 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
1512 | { |
1513 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
1514 | find this causes a significant slowdown in gdb then we could | |
1515 | set it in the debug symbol readers only when necessary. */ | |
1516 | objfile->flags |= OBJF_REORDERED; | |
1517 | } | |
1518 | ||
1519 | /* When handling an ELF file that contains Sun STABS debug info, | |
1520 | some of the debug info is relative to the particular chunk of the | |
1521 | section that was generated in its individual .o file. E.g. | |
1522 | offsets to static variables are relative to the start of the data | |
1523 | segment *for that module before linking*. This information is | |
1524 | painfully squirreled away in the ELF symbol table as local symbols | |
1525 | with wierd names. Go get 'em when needed. */ | |
1526 | ||
1527 | void | |
fba45db2 | 1528 | elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
c906108c | 1529 | { |
72b9f47f | 1530 | const char *filename = pst->filename; |
0a6ddd08 | 1531 | struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info; |
c906108c SS |
1532 | struct stab_section_info *maybe = dbx->stab_section_info; |
1533 | struct stab_section_info *questionable = 0; | |
1534 | int i; | |
c906108c SS |
1535 | |
1536 | /* The ELF symbol info doesn't include path names, so strip the path | |
1537 | (if any) from the psymtab filename. */ | |
0ba1096a | 1538 | filename = lbasename (filename); |
c906108c SS |
1539 | |
1540 | /* FIXME: This linear search could speed up significantly | |
1541 | if it was chained in the right order to match how we search it, | |
0963b4bd | 1542 | and if we unchained when we found a match. */ |
c906108c SS |
1543 | for (; maybe; maybe = maybe->next) |
1544 | { | |
1545 | if (filename[0] == maybe->filename[0] | |
0ba1096a | 1546 | && filename_cmp (filename, maybe->filename) == 0) |
c906108c SS |
1547 | { |
1548 | /* We found a match. But there might be several source files | |
1549 | (from different directories) with the same name. */ | |
1550 | if (0 == maybe->found) | |
1551 | break; | |
c5aa993b | 1552 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
1553 | } |
1554 | } | |
1555 | ||
1556 | if (maybe == 0 && questionable != 0) | |
1557 | { | |
23136709 | 1558 | complaint (&symfile_complaints, |
3e43a32a MS |
1559 | _("elf/stab section information questionable for %s"), |
1560 | filename); | |
c906108c SS |
1561 | maybe = questionable; |
1562 | } | |
1563 | ||
1564 | if (maybe) | |
1565 | { | |
1566 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
1567 | maybe->found++; | |
1568 | pst->section_offsets = (struct section_offsets *) | |
dea91a5c | 1569 | obstack_alloc (&objfile->objfile_obstack, |
a39a16c4 MM |
1570 | SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
1571 | for (i = 0; i < maybe->num_sections; i++) | |
a4c8257b | 1572 | (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
c906108c SS |
1573 | return; |
1574 | } | |
1575 | ||
1576 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 1577 | if (dbx->stab_section_info) /* If there *is* any info, */ |
23136709 | 1578 | complaint (&symfile_complaints, |
e2e0b3e5 | 1579 | _("elf/stab section information missing for %s"), filename); |
c906108c SS |
1580 | } |
1581 | \f | |
1582 | /* Register that we are able to handle ELF object file formats. */ | |
1583 | ||
00b5771c | 1584 | static const struct sym_fns elf_sym_fns = |
c906108c SS |
1585 | { |
1586 | bfd_target_elf_flavour, | |
3e43a32a MS |
1587 | elf_new_init, /* init anything gbl to entire symtab */ |
1588 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1589 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 TT |
1590 | NULL, /* sym_read_psymbols */ |
1591 | elf_symfile_finish, /* finished with file, cleanup */ | |
1592 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1593 | elf_symfile_segments, /* Get segment information from a file. */ | |
1594 | NULL, | |
1595 | default_symfile_relocate, /* Relocate a debug section. */ | |
1596 | &psym_functions | |
1597 | }; | |
1598 | ||
1599 | /* The same as elf_sym_fns, but not registered and lazily reads | |
1600 | psymbols. */ | |
1601 | ||
1602 | static const struct sym_fns elf_sym_fns_lazy_psyms = | |
1603 | { | |
1604 | bfd_target_elf_flavour, | |
1605 | elf_new_init, /* init anything gbl to entire symtab */ | |
1606 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1607 | elf_symfile_read, /* read a symbol file into symtab */ | |
1608 | read_psyms, /* sym_read_psymbols */ | |
3e43a32a MS |
1609 | elf_symfile_finish, /* finished with file, cleanup */ |
1610 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1611 | elf_symfile_segments, /* Get segment information from a file. */ | |
1612 | NULL, | |
1613 | default_symfile_relocate, /* Relocate a debug section. */ | |
00b5771c | 1614 | &psym_functions |
c906108c SS |
1615 | }; |
1616 | ||
9291a0cd TT |
1617 | /* The same as elf_sym_fns, but not registered and uses the |
1618 | DWARF-specific GNU index rather than psymtab. */ | |
00b5771c | 1619 | static const struct sym_fns elf_sym_fns_gdb_index = |
9291a0cd TT |
1620 | { |
1621 | bfd_target_elf_flavour, | |
3e43a32a MS |
1622 | elf_new_init, /* init anything gbl to entire symab */ |
1623 | elf_symfile_init, /* read initial info, setup for sym_red() */ | |
1624 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 | 1625 | NULL, /* sym_read_psymbols */ |
3e43a32a MS |
1626 | elf_symfile_finish, /* finished with file, cleanup */ |
1627 | default_symfile_offsets, /* Translate ext. to int. relocatin */ | |
1628 | elf_symfile_segments, /* Get segment information from a file. */ | |
1629 | NULL, | |
1630 | default_symfile_relocate, /* Relocate a debug section. */ | |
00b5771c | 1631 | &dwarf2_gdb_index_functions |
9291a0cd TT |
1632 | }; |
1633 | ||
07be84bf JK |
1634 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1635 | ||
1636 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1637 | { | |
1638 | elf_gnu_ifunc_resolve_addr, | |
1639 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1640 | elf_gnu_ifunc_resolver_stop, |
1641 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1642 | }; |
1643 | ||
c906108c | 1644 | void |
fba45db2 | 1645 | _initialize_elfread (void) |
c906108c SS |
1646 | { |
1647 | add_symtab_fns (&elf_sym_fns); | |
07be84bf JK |
1648 | |
1649 | elf_objfile_gnu_ifunc_cache_data = register_objfile_data (); | |
1650 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; | |
c906108c | 1651 | } |