Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
28e7fd62 | 3 | Copyright (C) 1991-2013 Free Software Foundation, Inc. |
1bac305b | 4 | |
c906108c SS |
5 | Written by Fred Fish at Cygnus Support. |
6 | ||
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "bfd.h" | |
24 | #include "gdb_string.h" | |
25 | #include "elf-bfd.h" | |
31d99776 DJ |
26 | #include "elf/common.h" |
27 | #include "elf/internal.h" | |
c906108c SS |
28 | #include "elf/mips.h" |
29 | #include "symtab.h" | |
30 | #include "symfile.h" | |
31 | #include "objfiles.h" | |
32 | #include "buildsym.h" | |
33 | #include "stabsread.h" | |
34 | #include "gdb-stabs.h" | |
35 | #include "complaints.h" | |
36 | #include "demangle.h" | |
ccefe4c4 | 37 | #include "psympriv.h" |
0ba1096a | 38 | #include "filenames.h" |
55aa24fb SDJ |
39 | #include "probe.h" |
40 | #include "arch-utils.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" |
cbb099e8 | 47 | #include "gdb_bfd.h" |
dc294be5 | 48 | #include "build-id.h" |
c906108c | 49 | |
a14ed312 | 50 | extern void _initialize_elfread (void); |
392a587b | 51 | |
b11896a5 | 52 | /* Forward declarations. */ |
00b5771c | 53 | static const struct sym_fns elf_sym_fns_gdb_index; |
b11896a5 | 54 | static const struct sym_fns elf_sym_fns_lazy_psyms; |
9291a0cd | 55 | |
c906108c | 56 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 57 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
58 | It's local to elf_symfile_read. */ |
59 | ||
c5aa993b JM |
60 | struct elfinfo |
61 | { | |
c5aa993b JM |
62 | asection *stabsect; /* Section pointer for .stab section */ |
63 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
64 | asection *mdebugsect; /* Section pointer for .mdebug section */ | |
65 | }; | |
c906108c | 66 | |
55aa24fb SDJ |
67 | /* Per-objfile data for probe info. */ |
68 | ||
69 | static const struct objfile_data *probe_key = NULL; | |
70 | ||
12b9c64f | 71 | static void free_elfinfo (void *); |
c906108c | 72 | |
07be84bf JK |
73 | /* Minimal symbols located at the GOT entries for .plt - that is the real |
74 | pointer where the given entry will jump to. It gets updated by the real | |
75 | function address during lazy ld.so resolving in the inferior. These | |
76 | minimal symbols are indexed for <tab>-completion. */ | |
77 | ||
78 | #define SYMBOL_GOT_PLT_SUFFIX "@got.plt" | |
79 | ||
31d99776 DJ |
80 | /* Locate the segments in ABFD. */ |
81 | ||
82 | static struct symfile_segment_data * | |
83 | elf_symfile_segments (bfd *abfd) | |
84 | { | |
85 | Elf_Internal_Phdr *phdrs, **segments; | |
86 | long phdrs_size; | |
87 | int num_phdrs, num_segments, num_sections, i; | |
88 | asection *sect; | |
89 | struct symfile_segment_data *data; | |
90 | ||
91 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
92 | if (phdrs_size == -1) | |
93 | return NULL; | |
94 | ||
95 | phdrs = alloca (phdrs_size); | |
96 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); | |
97 | if (num_phdrs == -1) | |
98 | return NULL; | |
99 | ||
100 | num_segments = 0; | |
101 | segments = alloca (sizeof (Elf_Internal_Phdr *) * num_phdrs); | |
102 | for (i = 0; i < num_phdrs; i++) | |
103 | if (phdrs[i].p_type == PT_LOAD) | |
104 | segments[num_segments++] = &phdrs[i]; | |
105 | ||
106 | if (num_segments == 0) | |
107 | return NULL; | |
108 | ||
109 | data = XZALLOC (struct symfile_segment_data); | |
110 | data->num_segments = num_segments; | |
111 | data->segment_bases = XCALLOC (num_segments, CORE_ADDR); | |
112 | data->segment_sizes = XCALLOC (num_segments, CORE_ADDR); | |
113 | ||
114 | for (i = 0; i < num_segments; i++) | |
115 | { | |
116 | data->segment_bases[i] = segments[i]->p_vaddr; | |
117 | data->segment_sizes[i] = segments[i]->p_memsz; | |
118 | } | |
119 | ||
120 | num_sections = bfd_count_sections (abfd); | |
121 | data->segment_info = XCALLOC (num_sections, int); | |
122 | ||
123 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
124 | { | |
125 | int j; | |
126 | CORE_ADDR vma; | |
127 | ||
128 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
129 | continue; | |
130 | ||
131 | vma = bfd_get_section_vma (abfd, sect); | |
132 | ||
133 | for (j = 0; j < num_segments; j++) | |
134 | if (segments[j]->p_memsz > 0 | |
135 | && vma >= segments[j]->p_vaddr | |
a366c65a | 136 | && (vma - segments[j]->p_vaddr) < segments[j]->p_memsz) |
31d99776 DJ |
137 | { |
138 | data->segment_info[i] = j + 1; | |
139 | break; | |
140 | } | |
141 | ||
ad09a548 DJ |
142 | /* We should have found a segment for every non-empty section. |
143 | If we haven't, we will not relocate this section by any | |
144 | offsets we apply to the segments. As an exception, do not | |
145 | warn about SHT_NOBITS sections; in normal ELF execution | |
146 | environments, SHT_NOBITS means zero-initialized and belongs | |
147 | in a segment, but in no-OS environments some tools (e.g. ARM | |
148 | RealView) use SHT_NOBITS for uninitialized data. Since it is | |
149 | uninitialized, it doesn't need a program header. Such | |
150 | binaries are not relocatable. */ | |
151 | if (bfd_get_section_size (sect) > 0 && j == num_segments | |
152 | && (bfd_get_section_flags (abfd, sect) & SEC_LOAD) != 0) | |
28ee876a | 153 | warning (_("Loadable section \"%s\" outside of ELF segments"), |
31d99776 DJ |
154 | bfd_section_name (abfd, sect)); |
155 | } | |
156 | ||
157 | return data; | |
158 | } | |
159 | ||
c906108c SS |
160 | /* We are called once per section from elf_symfile_read. We |
161 | need to examine each section we are passed, check to see | |
162 | if it is something we are interested in processing, and | |
163 | if so, stash away some access information for the section. | |
164 | ||
165 | For now we recognize the dwarf debug information sections and | |
166 | line number sections from matching their section names. The | |
167 | ELF definition is no real help here since it has no direct | |
168 | knowledge of DWARF (by design, so any debugging format can be | |
169 | used). | |
170 | ||
171 | We also recognize the ".stab" sections used by the Sun compilers | |
172 | released with Solaris 2. | |
173 | ||
174 | FIXME: The section names should not be hardwired strings (what | |
175 | should they be? I don't think most object file formats have enough | |
0963b4bd | 176 | section flags to specify what kind of debug section it is. |
c906108c SS |
177 | -kingdon). */ |
178 | ||
179 | static void | |
12b9c64f | 180 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
c906108c | 181 | { |
52f0bd74 | 182 | struct elfinfo *ei; |
c906108c SS |
183 | |
184 | ei = (struct elfinfo *) eip; | |
7ce59000 | 185 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 186 | { |
c5aa993b | 187 | ei->stabsect = sectp; |
c906108c | 188 | } |
6314a349 | 189 | else if (strcmp (sectp->name, ".stab.index") == 0) |
c906108c | 190 | { |
c5aa993b | 191 | ei->stabindexsect = sectp; |
c906108c | 192 | } |
6314a349 | 193 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 194 | { |
c5aa993b | 195 | ei->mdebugsect = sectp; |
c906108c SS |
196 | } |
197 | } | |
198 | ||
c906108c | 199 | static struct minimal_symbol * |
04a679b8 TT |
200 | record_minimal_symbol (const char *name, int name_len, int copy_name, |
201 | CORE_ADDR address, | |
f594e5e9 MC |
202 | enum minimal_symbol_type ms_type, |
203 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 204 | { |
5e2b427d UW |
205 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
206 | ||
0875794a JK |
207 | if (ms_type == mst_text || ms_type == mst_file_text |
208 | || ms_type == mst_text_gnu_ifunc) | |
85ddcc70 | 209 | address = gdbarch_addr_bits_remove (gdbarch, address); |
c906108c | 210 | |
04a679b8 | 211 | return prim_record_minimal_symbol_full (name, name_len, copy_name, address, |
65cf3563 TT |
212 | ms_type, |
213 | gdb_bfd_section_index (objfile->obfd, | |
214 | bfd_section), | |
e6dc44a8 | 215 | objfile); |
c906108c SS |
216 | } |
217 | ||
7f86f058 | 218 | /* Read the symbol table of an ELF file. |
c906108c | 219 | |
62553543 | 220 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
221 | symbol table contains regular, dynamic, or synthetic symbols, add all |
222 | the global function and data symbols to the minimal symbol table. | |
c906108c | 223 | |
c5aa993b JM |
224 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
225 | defined in the ELF symbol table, which can be used to locate | |
226 | the beginnings of sections from each ".o" file that was linked to | |
227 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 228 | in data structures hung off the objfile's private data. */ |
c906108c | 229 | |
6f610d07 UW |
230 | #define ST_REGULAR 0 |
231 | #define ST_DYNAMIC 1 | |
232 | #define ST_SYNTHETIC 2 | |
233 | ||
c906108c | 234 | static void |
6f610d07 | 235 | elf_symtab_read (struct objfile *objfile, int type, |
04a679b8 TT |
236 | long number_of_symbols, asymbol **symbol_table, |
237 | int copy_names) | |
c906108c | 238 | { |
5e2b427d | 239 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
c906108c | 240 | asymbol *sym; |
c906108c | 241 | long i; |
c906108c | 242 | CORE_ADDR symaddr; |
d4f3574e | 243 | CORE_ADDR offset; |
c906108c SS |
244 | enum minimal_symbol_type ms_type; |
245 | /* If sectinfo is nonNULL, it contains section info that should end up | |
246 | filed in the objfile. */ | |
247 | struct stab_section_info *sectinfo = NULL; | |
248 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
249 | seen any section info for it yet. */ | |
250 | asymbol *filesym = 0; | |
1c9e8358 | 251 | /* Name of filesym. This is either a constant string or is saved on |
0af1e9a5 TT |
252 | the objfile's filename cache. */ |
253 | const char *filesymname = ""; | |
d2f4b8fe | 254 | struct dbx_symfile_info *dbx = DBX_SYMFILE_INFO (objfile); |
d4f3574e | 255 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
c5aa993b | 256 | |
0cc7b392 | 257 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 258 | { |
0cc7b392 DJ |
259 | sym = symbol_table[i]; |
260 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 261 | { |
0cc7b392 | 262 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 263 | that are null strings (may happen). */ |
0cc7b392 DJ |
264 | continue; |
265 | } | |
c906108c | 266 | |
74763737 DJ |
267 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
268 | symbols which do not correspond to objects in the symbol table, | |
269 | but have some other target-specific meaning. */ | |
270 | if (bfd_is_target_special_symbol (objfile->obfd, sym)) | |
60c5725c DJ |
271 | { |
272 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
273 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
274 | continue; | |
275 | } | |
74763737 | 276 | |
65cf3563 TT |
277 | offset = ANOFFSET (objfile->section_offsets, |
278 | gdb_bfd_section_index (objfile->obfd, sym->section)); | |
6f610d07 | 279 | if (type == ST_DYNAMIC |
45dfa85a | 280 | && sym->section == bfd_und_section_ptr |
0cc7b392 DJ |
281 | && (sym->flags & BSF_FUNCTION)) |
282 | { | |
283 | struct minimal_symbol *msym; | |
02c75f72 | 284 | bfd *abfd = objfile->obfd; |
dea91a5c | 285 | asection *sect; |
0cc7b392 DJ |
286 | |
287 | /* Symbol is a reference to a function defined in | |
288 | a shared library. | |
289 | If its value is non zero then it is usually the address | |
290 | of the corresponding entry in the procedure linkage table, | |
291 | plus the desired section offset. | |
292 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 293 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
294 | for this symbol in the executable file, so we skip it. */ |
295 | symaddr = sym->value; | |
296 | if (symaddr == 0) | |
297 | continue; | |
02c75f72 UW |
298 | |
299 | /* sym->section is the undefined section. However, we want to | |
300 | record the section where the PLT stub resides with the | |
301 | minimal symbol. Search the section table for the one that | |
302 | covers the stub's address. */ | |
303 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
304 | { | |
305 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
306 | continue; | |
307 | ||
308 | if (symaddr >= bfd_get_section_vma (abfd, sect) | |
309 | && symaddr < bfd_get_section_vma (abfd, sect) | |
310 | + bfd_get_section_size (sect)) | |
311 | break; | |
312 | } | |
313 | if (!sect) | |
314 | continue; | |
315 | ||
828cfa8d JB |
316 | /* On ia64-hpux, we have discovered that the system linker |
317 | adds undefined symbols with nonzero addresses that cannot | |
318 | be right (their address points inside the code of another | |
319 | function in the .text section). This creates problems | |
320 | when trying to determine which symbol corresponds to | |
321 | a given address. | |
322 | ||
323 | We try to detect those buggy symbols by checking which | |
324 | section we think they correspond to. Normally, PLT symbols | |
325 | are stored inside their own section, and the typical name | |
326 | for that section is ".plt". So, if there is a ".plt" | |
327 | section, and yet the section name of our symbol does not | |
328 | start with ".plt", we ignore that symbol. */ | |
329 | if (strncmp (sect->name, ".plt", 4) != 0 | |
330 | && bfd_get_section_by_name (abfd, ".plt") != NULL) | |
331 | continue; | |
332 | ||
65cf3563 TT |
333 | symaddr += ANOFFSET (objfile->section_offsets, |
334 | gdb_bfd_section_index (objfile->obfd, sect)); | |
02c75f72 | 335 | |
0cc7b392 | 336 | msym = record_minimal_symbol |
04a679b8 TT |
337 | (sym->name, strlen (sym->name), copy_names, |
338 | symaddr, mst_solib_trampoline, sect, objfile); | |
0cc7b392 DJ |
339 | if (msym != NULL) |
340 | msym->filename = filesymname; | |
0cc7b392 DJ |
341 | continue; |
342 | } | |
c906108c | 343 | |
0cc7b392 DJ |
344 | /* If it is a nonstripped executable, do not enter dynamic |
345 | symbols, as the dynamic symbol table is usually a subset | |
346 | of the main symbol table. */ | |
6f610d07 | 347 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
348 | continue; |
349 | if (sym->flags & BSF_FILE) | |
350 | { | |
351 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
352 | Chain any old one onto the objfile; remember new sym. */ | |
353 | if (sectinfo != NULL) | |
c906108c | 354 | { |
0cc7b392 DJ |
355 | sectinfo->next = dbx->stab_section_info; |
356 | dbx->stab_section_info = sectinfo; | |
357 | sectinfo = NULL; | |
358 | } | |
359 | filesym = sym; | |
0af1e9a5 | 360 | filesymname = bcache (filesym->name, strlen (filesym->name) + 1, |
706e3705 | 361 | objfile->per_bfd->filename_cache); |
0cc7b392 DJ |
362 | } |
363 | else if (sym->flags & BSF_SECTION_SYM) | |
364 | continue; | |
bb869963 SDJ |
365 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK |
366 | | BSF_GNU_UNIQUE)) | |
0cc7b392 DJ |
367 | { |
368 | struct minimal_symbol *msym; | |
369 | ||
370 | /* Select global/local/weak symbols. Note that bfd puts abs | |
371 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
372 | interested in will have a section. */ |
373 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 374 | symaddr = sym->value + sym->section->vma; |
45148c2e UW |
375 | /* Relocate all non-absolute and non-TLS symbols by the |
376 | section offset. */ | |
45dfa85a | 377 | if (sym->section != bfd_abs_section_ptr |
45148c2e | 378 | && !(sym->section->flags & SEC_THREAD_LOCAL)) |
0cc7b392 DJ |
379 | { |
380 | symaddr += offset; | |
c906108c | 381 | } |
0cc7b392 DJ |
382 | /* For non-absolute symbols, use the type of the section |
383 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 384 | no way of figuring this out for absolute symbols. */ |
45dfa85a | 385 | if (sym->section == bfd_abs_section_ptr) |
c906108c | 386 | { |
0cc7b392 DJ |
387 | /* This is a hack to get the minimal symbol type |
388 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
389 | with special section indices for dynamic symbols. |
390 | ||
391 | NOTE: uweigand-20071112: Synthetic symbols do not | |
392 | have an ELF-private part, so do not touch those. */ | |
dea91a5c | 393 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
0cc7b392 DJ |
394 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
395 | ||
396 | switch (shndx) | |
c906108c | 397 | { |
0cc7b392 DJ |
398 | case SHN_MIPS_TEXT: |
399 | ms_type = mst_text; | |
400 | break; | |
401 | case SHN_MIPS_DATA: | |
402 | ms_type = mst_data; | |
403 | break; | |
404 | case SHN_MIPS_ACOMMON: | |
405 | ms_type = mst_bss; | |
406 | break; | |
407 | default: | |
408 | ms_type = mst_abs; | |
409 | } | |
410 | ||
411 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 412 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
413 | if (ms_type != mst_abs) |
414 | { | |
415 | if (sym->name[0] == '.') | |
416 | continue; | |
d4f3574e | 417 | symaddr += offset; |
c906108c | 418 | } |
0cc7b392 DJ |
419 | } |
420 | else if (sym->section->flags & SEC_CODE) | |
421 | { | |
bb869963 | 422 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 423 | { |
0875794a JK |
424 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
425 | ms_type = mst_text_gnu_ifunc; | |
426 | else | |
427 | ms_type = mst_text; | |
0cc7b392 | 428 | } |
90359a16 JK |
429 | /* The BSF_SYNTHETIC check is there to omit ppc64 function |
430 | descriptors mistaken for static functions starting with 'L'. | |
431 | */ | |
432 | else if ((sym->name[0] == '.' && sym->name[1] == 'L' | |
433 | && (sym->flags & BSF_SYNTHETIC) == 0) | |
0cc7b392 DJ |
434 | || ((sym->flags & BSF_LOCAL) |
435 | && sym->name[0] == '$' | |
436 | && sym->name[1] == 'L')) | |
437 | /* Looks like a compiler-generated label. Skip | |
438 | it. The assembler should be skipping these (to | |
439 | keep executables small), but apparently with | |
440 | gcc on the (deleted) delta m88k SVR4, it loses. | |
441 | So to have us check too should be harmless (but | |
442 | I encourage people to fix this in the assembler | |
443 | instead of adding checks here). */ | |
444 | continue; | |
445 | else | |
446 | { | |
447 | ms_type = mst_file_text; | |
c906108c | 448 | } |
0cc7b392 DJ |
449 | } |
450 | else if (sym->section->flags & SEC_ALLOC) | |
451 | { | |
bb869963 | 452 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 453 | { |
0cc7b392 | 454 | if (sym->section->flags & SEC_LOAD) |
c906108c | 455 | { |
0cc7b392 | 456 | ms_type = mst_data; |
c906108c | 457 | } |
c906108c SS |
458 | else |
459 | { | |
0cc7b392 | 460 | ms_type = mst_bss; |
c906108c SS |
461 | } |
462 | } | |
0cc7b392 | 463 | else if (sym->flags & BSF_LOCAL) |
c906108c | 464 | { |
0cc7b392 DJ |
465 | /* Named Local variable in a Data section. |
466 | Check its name for stabs-in-elf. */ | |
467 | int special_local_sect; | |
d7f9d729 | 468 | |
0cc7b392 DJ |
469 | if (strcmp ("Bbss.bss", sym->name) == 0) |
470 | special_local_sect = SECT_OFF_BSS (objfile); | |
471 | else if (strcmp ("Ddata.data", sym->name) == 0) | |
472 | special_local_sect = SECT_OFF_DATA (objfile); | |
473 | else if (strcmp ("Drodata.rodata", sym->name) == 0) | |
474 | special_local_sect = SECT_OFF_RODATA (objfile); | |
475 | else | |
476 | special_local_sect = -1; | |
477 | if (special_local_sect >= 0) | |
c906108c | 478 | { |
0cc7b392 DJ |
479 | /* Found a special local symbol. Allocate a |
480 | sectinfo, if needed, and fill it in. */ | |
481 | if (sectinfo == NULL) | |
c906108c | 482 | { |
0cc7b392 DJ |
483 | int max_index; |
484 | size_t size; | |
485 | ||
25c2f6ab PP |
486 | max_index = SECT_OFF_BSS (objfile); |
487 | if (objfile->sect_index_data > max_index) | |
488 | max_index = objfile->sect_index_data; | |
489 | if (objfile->sect_index_rodata > max_index) | |
490 | max_index = objfile->sect_index_rodata; | |
0cc7b392 DJ |
491 | |
492 | /* max_index is the largest index we'll | |
493 | use into this array, so we must | |
494 | allocate max_index+1 elements for it. | |
495 | However, 'struct stab_section_info' | |
496 | already includes one element, so we | |
497 | need to allocate max_index aadditional | |
498 | elements. */ | |
dea91a5c | 499 | size = (sizeof (struct stab_section_info) |
c05d19c5 | 500 | + (sizeof (CORE_ADDR) * max_index)); |
0cc7b392 DJ |
501 | sectinfo = (struct stab_section_info *) |
502 | xmalloc (size); | |
503 | memset (sectinfo, 0, size); | |
504 | sectinfo->num_sections = max_index; | |
505 | if (filesym == NULL) | |
c906108c | 506 | { |
0cc7b392 | 507 | complaint (&symfile_complaints, |
3e43a32a MS |
508 | _("elf/stab section information %s " |
509 | "without a preceding file symbol"), | |
0cc7b392 DJ |
510 | sym->name); |
511 | } | |
512 | else | |
513 | { | |
514 | sectinfo->filename = | |
515 | (char *) filesym->name; | |
c906108c | 516 | } |
c906108c | 517 | } |
0cc7b392 DJ |
518 | if (sectinfo->sections[special_local_sect] != 0) |
519 | complaint (&symfile_complaints, | |
3e43a32a MS |
520 | _("duplicated elf/stab section " |
521 | "information for %s"), | |
0cc7b392 DJ |
522 | sectinfo->filename); |
523 | /* BFD symbols are section relative. */ | |
524 | symaddr = sym->value + sym->section->vma; | |
525 | /* Relocate non-absolute symbols by the | |
526 | section offset. */ | |
45dfa85a | 527 | if (sym->section != bfd_abs_section_ptr) |
0cc7b392 DJ |
528 | symaddr += offset; |
529 | sectinfo->sections[special_local_sect] = symaddr; | |
530 | /* The special local symbols don't go in the | |
531 | minimal symbol table, so ignore this one. */ | |
532 | continue; | |
533 | } | |
534 | /* Not a special stabs-in-elf symbol, do regular | |
535 | symbol processing. */ | |
536 | if (sym->section->flags & SEC_LOAD) | |
537 | { | |
538 | ms_type = mst_file_data; | |
c906108c SS |
539 | } |
540 | else | |
541 | { | |
0cc7b392 | 542 | ms_type = mst_file_bss; |
c906108c SS |
543 | } |
544 | } | |
545 | else | |
546 | { | |
0cc7b392 | 547 | ms_type = mst_unknown; |
c906108c | 548 | } |
0cc7b392 DJ |
549 | } |
550 | else | |
551 | { | |
552 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 553 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
554 | hob with actions like finding what function the PC |
555 | is in. Ignore them if they aren't text, data, or bss. */ | |
556 | /* ms_type = mst_unknown; */ | |
0963b4bd | 557 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
558 | } |
559 | msym = record_minimal_symbol | |
04a679b8 | 560 | (sym->name, strlen (sym->name), copy_names, symaddr, |
0cc7b392 | 561 | ms_type, sym->section, objfile); |
6f610d07 | 562 | |
0cc7b392 DJ |
563 | if (msym) |
564 | { | |
6f610d07 | 565 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an |
24c274a1 | 566 | ELF-private part. */ |
6f610d07 | 567 | if (type != ST_SYNTHETIC) |
24c274a1 AM |
568 | { |
569 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
570 | elf_symbol_type *elf_sym = (elf_symbol_type *) sym; | |
571 | SET_MSYMBOL_SIZE (msym, elf_sym->internal_elf_sym.st_size); | |
572 | } | |
dea91a5c | 573 | |
a103a963 DJ |
574 | msym->filename = filesymname; |
575 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 576 | } |
2eaf8d2a | 577 | |
715c6909 TT |
578 | /* If we see a default versioned symbol, install it under |
579 | its version-less name. */ | |
580 | if (msym != NULL) | |
581 | { | |
582 | const char *atsign = strchr (sym->name, '@'); | |
583 | ||
584 | if (atsign != NULL && atsign[1] == '@' && atsign > sym->name) | |
585 | { | |
586 | int len = atsign - sym->name; | |
587 | ||
588 | record_minimal_symbol (sym->name, len, 1, symaddr, | |
589 | ms_type, sym->section, objfile); | |
590 | } | |
591 | } | |
592 | ||
2eaf8d2a DJ |
593 | /* For @plt symbols, also record a trampoline to the |
594 | destination symbol. The @plt symbol will be used in | |
595 | disassembly, and the trampoline will be used when we are | |
596 | trying to find the target. */ | |
597 | if (msym && ms_type == mst_text && type == ST_SYNTHETIC) | |
598 | { | |
599 | int len = strlen (sym->name); | |
600 | ||
601 | if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0) | |
602 | { | |
2eaf8d2a DJ |
603 | struct minimal_symbol *mtramp; |
604 | ||
04a679b8 TT |
605 | mtramp = record_minimal_symbol (sym->name, len - 4, 1, |
606 | symaddr, | |
2eaf8d2a DJ |
607 | mst_solib_trampoline, |
608 | sym->section, objfile); | |
609 | if (mtramp) | |
610 | { | |
d9eaeb59 | 611 | SET_MSYMBOL_SIZE (mtramp, MSYMBOL_SIZE (msym)); |
422d65e7 | 612 | mtramp->created_by_gdb = 1; |
2eaf8d2a DJ |
613 | mtramp->filename = filesymname; |
614 | gdbarch_elf_make_msymbol_special (gdbarch, sym, mtramp); | |
615 | } | |
616 | } | |
617 | } | |
c906108c | 618 | } |
c906108c SS |
619 | } |
620 | } | |
621 | ||
07be84bf JK |
622 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
623 | for later look ups of which function to call when user requests | |
624 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
625 | library defining `function' we cannot yet know while reading OBJFILE which | |
626 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
627 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
628 | ||
629 | static void | |
630 | elf_rel_plt_read (struct objfile *objfile, asymbol **dyn_symbol_table) | |
631 | { | |
632 | bfd *obfd = objfile->obfd; | |
633 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); | |
634 | asection *plt, *relplt, *got_plt; | |
07be84bf JK |
635 | int plt_elf_idx; |
636 | bfd_size_type reloc_count, reloc; | |
637 | char *string_buffer = NULL; | |
638 | size_t string_buffer_size = 0; | |
639 | struct cleanup *back_to; | |
df6d5441 | 640 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
641 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
642 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
643 | ||
644 | if (objfile->separate_debug_objfile_backlink) | |
645 | return; | |
646 | ||
647 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
648 | if (plt == NULL) | |
649 | return; | |
650 | plt_elf_idx = elf_section_data (plt)->this_idx; | |
651 | ||
652 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); | |
653 | if (got_plt == NULL) | |
654 | return; | |
655 | ||
656 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ | |
657 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
658 | if (elf_section_data (relplt)->this_hdr.sh_info == plt_elf_idx | |
659 | && (elf_section_data (relplt)->this_hdr.sh_type == SHT_REL | |
660 | || elf_section_data (relplt)->this_hdr.sh_type == SHT_RELA)) | |
661 | break; | |
662 | if (relplt == NULL) | |
663 | return; | |
664 | ||
665 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
666 | return; | |
667 | ||
668 | back_to = make_cleanup (free_current_contents, &string_buffer); | |
669 | ||
670 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; | |
671 | for (reloc = 0; reloc < reloc_count; reloc++) | |
672 | { | |
22e048c9 | 673 | const char *name; |
07be84bf JK |
674 | struct minimal_symbol *msym; |
675 | CORE_ADDR address; | |
676 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); | |
677 | size_t name_len; | |
678 | ||
679 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
680 | name_len = strlen (name); | |
681 | address = relplt->relocation[reloc].address; | |
682 | ||
683 | /* Does the pointer reside in the .got.plt section? */ | |
684 | if (!(bfd_get_section_vma (obfd, got_plt) <= address | |
685 | && address < bfd_get_section_vma (obfd, got_plt) | |
686 | + bfd_get_section_size (got_plt))) | |
687 | continue; | |
688 | ||
689 | /* We cannot check if NAME is a reference to mst_text_gnu_ifunc as in | |
690 | OBJFILE the symbol is undefined and the objfile having NAME defined | |
691 | may not yet have been loaded. */ | |
692 | ||
3807f613 | 693 | if (string_buffer_size < name_len + got_suffix_len + 1) |
07be84bf JK |
694 | { |
695 | string_buffer_size = 2 * (name_len + got_suffix_len); | |
696 | string_buffer = xrealloc (string_buffer, string_buffer_size); | |
697 | } | |
698 | memcpy (string_buffer, name, name_len); | |
699 | memcpy (&string_buffer[name_len], SYMBOL_GOT_PLT_SUFFIX, | |
3807f613 | 700 | got_suffix_len + 1); |
07be84bf JK |
701 | |
702 | msym = record_minimal_symbol (string_buffer, name_len + got_suffix_len, | |
703 | 1, address, mst_slot_got_plt, got_plt, | |
704 | objfile); | |
705 | if (msym) | |
d9eaeb59 | 706 | SET_MSYMBOL_SIZE (msym, ptr_size); |
07be84bf JK |
707 | } |
708 | ||
709 | do_cleanups (back_to); | |
710 | } | |
711 | ||
712 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
713 | ||
714 | static const struct objfile_data *elf_objfile_gnu_ifunc_cache_data; | |
715 | ||
716 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
717 | ||
718 | struct elf_gnu_ifunc_cache | |
719 | { | |
720 | /* This is always a function entry address, not a function descriptor. */ | |
721 | CORE_ADDR addr; | |
722 | ||
723 | char name[1]; | |
724 | }; | |
725 | ||
726 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
727 | ||
728 | static hashval_t | |
729 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
730 | { | |
731 | const struct elf_gnu_ifunc_cache *a = a_voidp; | |
732 | ||
733 | return htab_hash_string (a->name); | |
734 | } | |
735 | ||
736 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
737 | ||
738 | static int | |
739 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
740 | { | |
741 | const struct elf_gnu_ifunc_cache *a = a_voidp; | |
742 | const struct elf_gnu_ifunc_cache *b = b_voidp; | |
743 | ||
744 | return strcmp (a->name, b->name) == 0; | |
745 | } | |
746 | ||
747 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
748 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
749 | valid and therefore they were successfully recorded, return 0 otherwise. | |
750 | ||
751 | Function does not expect a duplicate entry. Use | |
752 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
753 | exists. */ | |
754 | ||
755 | static int | |
756 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
757 | { | |
7cbd4a93 | 758 | struct bound_minimal_symbol msym; |
07be84bf JK |
759 | asection *sect; |
760 | struct objfile *objfile; | |
761 | htab_t htab; | |
762 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
763 | void **slot; | |
764 | ||
765 | msym = lookup_minimal_symbol_by_pc (addr); | |
7cbd4a93 | 766 | if (msym.minsym == NULL) |
07be84bf | 767 | return 0; |
7cbd4a93 | 768 | if (SYMBOL_VALUE_ADDRESS (msym.minsym) != addr) |
07be84bf JK |
769 | return 0; |
770 | /* minimal symbols have always SYMBOL_OBJ_SECTION non-NULL. */ | |
e27d198c TT |
771 | sect = SYMBOL_OBJ_SECTION (msym.objfile, msym.minsym)->the_bfd_section; |
772 | objfile = msym.objfile; | |
07be84bf JK |
773 | |
774 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
775 | resolution and it has no use for GDB. Besides ".text" this symbol can | |
776 | reside also in ".opd" for ppc64 function descriptor. */ | |
777 | if (strcmp (bfd_get_section_name (objfile->obfd, sect), ".plt") == 0) | |
778 | return 0; | |
779 | ||
780 | htab = objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data); | |
781 | if (htab == NULL) | |
782 | { | |
783 | htab = htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash, | |
784 | elf_gnu_ifunc_cache_eq, | |
785 | NULL, &objfile->objfile_obstack, | |
786 | hashtab_obstack_allocate, | |
787 | dummy_obstack_deallocate); | |
788 | set_objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data, htab); | |
789 | } | |
790 | ||
791 | entry_local.addr = addr; | |
792 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
793 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
794 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
795 | entry_p = obstack_finish (&objfile->objfile_obstack); | |
796 | ||
797 | slot = htab_find_slot (htab, entry_p, INSERT); | |
798 | if (*slot != NULL) | |
799 | { | |
800 | struct elf_gnu_ifunc_cache *entry_found_p = *slot; | |
df6d5441 | 801 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
802 | |
803 | if (entry_found_p->addr != addr) | |
804 | { | |
805 | /* This case indicates buggy inferior program, the resolved address | |
806 | should never change. */ | |
807 | ||
808 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
809 | "function_address from %s to %s"), | |
810 | name, paddress (gdbarch, entry_found_p->addr), | |
811 | paddress (gdbarch, addr)); | |
812 | } | |
813 | ||
814 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
815 | } | |
816 | *slot = entry_p; | |
817 | ||
818 | return 1; | |
819 | } | |
820 | ||
821 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
822 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
823 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
824 | ||
825 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
826 | function. */ | |
827 | ||
828 | static int | |
829 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
830 | { | |
831 | struct objfile *objfile; | |
832 | ||
833 | ALL_PSPACE_OBJFILES (current_program_space, objfile) | |
834 | { | |
835 | htab_t htab; | |
836 | struct elf_gnu_ifunc_cache *entry_p; | |
837 | void **slot; | |
838 | ||
839 | htab = objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data); | |
840 | if (htab == NULL) | |
841 | continue; | |
842 | ||
843 | entry_p = alloca (sizeof (*entry_p) + strlen (name)); | |
844 | strcpy (entry_p->name, name); | |
845 | ||
846 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
847 | if (slot == NULL) | |
848 | continue; | |
849 | entry_p = *slot; | |
850 | gdb_assert (entry_p != NULL); | |
851 | ||
852 | if (addr_p) | |
853 | *addr_p = entry_p->addr; | |
854 | return 1; | |
855 | } | |
856 | ||
857 | return 0; | |
858 | } | |
859 | ||
860 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
861 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
862 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
863 | ||
864 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
865 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
866 | prevent cache entries duplicates. */ | |
867 | ||
868 | static int | |
869 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
870 | { | |
871 | char *name_got_plt; | |
872 | struct objfile *objfile; | |
873 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); | |
874 | ||
875 | name_got_plt = alloca (strlen (name) + got_suffix_len + 1); | |
876 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); | |
877 | ||
878 | ALL_PSPACE_OBJFILES (current_program_space, objfile) | |
879 | { | |
880 | bfd *obfd = objfile->obfd; | |
df6d5441 | 881 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
882 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
883 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
884 | CORE_ADDR pointer_address, addr; | |
885 | asection *plt; | |
886 | gdb_byte *buf = alloca (ptr_size); | |
887 | struct minimal_symbol *msym; | |
888 | ||
889 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
890 | if (msym == NULL) | |
891 | continue; | |
892 | if (MSYMBOL_TYPE (msym) != mst_slot_got_plt) | |
893 | continue; | |
894 | pointer_address = SYMBOL_VALUE_ADDRESS (msym); | |
895 | ||
896 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
897 | if (plt == NULL) | |
898 | continue; | |
899 | ||
900 | if (MSYMBOL_SIZE (msym) != ptr_size) | |
901 | continue; | |
902 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
903 | continue; | |
904 | addr = extract_typed_address (buf, ptr_type); | |
905 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, | |
906 | ¤t_target); | |
907 | ||
908 | if (addr_p) | |
909 | *addr_p = addr; | |
910 | if (elf_gnu_ifunc_record_cache (name, addr)) | |
911 | return 1; | |
912 | } | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
918 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
919 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
920 | ||
921 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
922 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
923 | ||
924 | static int | |
925 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) | |
926 | { | |
927 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
928 | return 1; | |
dea91a5c | 929 | |
07be84bf JK |
930 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
931 | return 1; | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
936 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
937 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
938 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
939 | */ | |
940 | ||
941 | static CORE_ADDR | |
942 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
943 | { | |
2c02bd72 | 944 | const char *name_at_pc; |
07be84bf JK |
945 | CORE_ADDR start_at_pc, address; |
946 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
947 | struct value *function, *address_val; | |
948 | ||
949 | /* Try first any non-intrusive methods without an inferior call. */ | |
950 | ||
951 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
952 | && start_at_pc == pc) | |
953 | { | |
954 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
955 | return address; | |
956 | } | |
957 | else | |
958 | name_at_pc = NULL; | |
959 | ||
960 | function = allocate_value (func_func_type); | |
961 | set_value_address (function, pc); | |
962 | ||
963 | /* STT_GNU_IFUNC resolver functions have no parameters. FUNCTION is the | |
964 | function entry address. ADDRESS may be a function descriptor. */ | |
965 | ||
966 | address_val = call_function_by_hand (function, 0, NULL); | |
967 | address = value_as_address (address_val); | |
968 | address = gdbarch_convert_from_func_ptr_addr (gdbarch, address, | |
969 | ¤t_target); | |
970 | ||
971 | if (name_at_pc) | |
972 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
973 | ||
974 | return address; | |
975 | } | |
976 | ||
0e30163f JK |
977 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
978 | ||
979 | static void | |
980 | elf_gnu_ifunc_resolver_stop (struct breakpoint *b) | |
981 | { | |
982 | struct breakpoint *b_return; | |
983 | struct frame_info *prev_frame = get_prev_frame (get_current_frame ()); | |
984 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); | |
985 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
986 | int thread_id = pid_to_thread_id (inferior_ptid); | |
987 | ||
988 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
989 | ||
990 | for (b_return = b->related_breakpoint; b_return != b; | |
991 | b_return = b_return->related_breakpoint) | |
992 | { | |
993 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
994 | gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL); | |
995 | gdb_assert (frame_id_p (b_return->frame_id)); | |
996 | ||
997 | if (b_return->thread == thread_id | |
998 | && b_return->loc->requested_address == prev_pc | |
999 | && frame_id_eq (b_return->frame_id, prev_frame_id)) | |
1000 | break; | |
1001 | } | |
1002 | ||
1003 | if (b_return == b) | |
1004 | { | |
1005 | struct symtab_and_line sal; | |
1006 | ||
1007 | /* No need to call find_pc_line for symbols resolving as this is only | |
1008 | a helper breakpointer never shown to the user. */ | |
1009 | ||
1010 | init_sal (&sal); | |
1011 | sal.pspace = current_inferior ()->pspace; | |
1012 | sal.pc = prev_pc; | |
1013 | sal.section = find_pc_overlay (sal.pc); | |
1014 | sal.explicit_pc = 1; | |
1015 | b_return = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
1016 | prev_frame_id, | |
1017 | bp_gnu_ifunc_resolver_return); | |
1018 | ||
c70a6932 JK |
1019 | /* set_momentary_breakpoint invalidates PREV_FRAME. */ |
1020 | prev_frame = NULL; | |
1021 | ||
0e30163f JK |
1022 | /* Add new b_return to the ring list b->related_breakpoint. */ |
1023 | gdb_assert (b_return->related_breakpoint == b_return); | |
1024 | b_return->related_breakpoint = b->related_breakpoint; | |
1025 | b->related_breakpoint = b_return; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
1030 | ||
1031 | static void | |
1032 | elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b) | |
1033 | { | |
1034 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); | |
1035 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
1036 | struct type *value_type = TYPE_TARGET_TYPE (func_func_type); | |
1037 | struct regcache *regcache = get_thread_regcache (inferior_ptid); | |
6a3a010b | 1038 | struct value *func_func; |
0e30163f JK |
1039 | struct value *value; |
1040 | CORE_ADDR resolved_address, resolved_pc; | |
1041 | struct symtab_and_line sal; | |
f1310107 | 1042 | struct symtabs_and_lines sals, sals_end; |
0e30163f JK |
1043 | |
1044 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
1045 | ||
0e30163f JK |
1046 | while (b->related_breakpoint != b) |
1047 | { | |
1048 | struct breakpoint *b_next = b->related_breakpoint; | |
1049 | ||
1050 | switch (b->type) | |
1051 | { | |
1052 | case bp_gnu_ifunc_resolver: | |
1053 | break; | |
1054 | case bp_gnu_ifunc_resolver_return: | |
1055 | delete_breakpoint (b); | |
1056 | break; | |
1057 | default: | |
1058 | internal_error (__FILE__, __LINE__, | |
1059 | _("handle_inferior_event: Invalid " | |
1060 | "gnu-indirect-function breakpoint type %d"), | |
1061 | (int) b->type); | |
1062 | } | |
1063 | b = b_next; | |
1064 | } | |
1065 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
6a3a010b MR |
1066 | gdb_assert (b->loc->next == NULL); |
1067 | ||
1068 | func_func = allocate_value (func_func_type); | |
1069 | set_value_address (func_func, b->loc->related_address); | |
1070 | ||
1071 | value = allocate_value (value_type); | |
1072 | gdbarch_return_value (gdbarch, func_func, value_type, regcache, | |
1073 | value_contents_raw (value), NULL); | |
1074 | resolved_address = value_as_address (value); | |
1075 | resolved_pc = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
1076 | resolved_address, | |
1077 | ¤t_target); | |
0e30163f | 1078 | |
f8eba3c6 | 1079 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
0e30163f JK |
1080 | elf_gnu_ifunc_record_cache (b->addr_string, resolved_pc); |
1081 | ||
1082 | sal = find_pc_line (resolved_pc, 0); | |
1083 | sals.nelts = 1; | |
1084 | sals.sals = &sal; | |
f1310107 | 1085 | sals_end.nelts = 0; |
0e30163f JK |
1086 | |
1087 | b->type = bp_breakpoint; | |
f1310107 | 1088 | update_breakpoint_locations (b, sals, sals_end); |
0e30163f JK |
1089 | } |
1090 | ||
c906108c | 1091 | /* Scan and build partial symbols for a symbol file. |
dea91a5c | 1092 | We have been initialized by a call to elf_symfile_init, which |
c906108c SS |
1093 | currently does nothing. |
1094 | ||
1095 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
1096 | in each section. We simplify it down to a single offset for all | |
1097 | symbols. FIXME. | |
1098 | ||
c906108c SS |
1099 | This function only does the minimum work necessary for letting the |
1100 | user "name" things symbolically; it does not read the entire symtab. | |
1101 | Instead, it reads the external and static symbols and puts them in partial | |
1102 | symbol tables. When more extensive information is requested of a | |
1103 | file, the corresponding partial symbol table is mutated into a full | |
1104 | fledged symbol table by going back and reading the symbols | |
1105 | for real. | |
1106 | ||
1107 | We look for sections with specific names, to tell us what debug | |
1108 | format to look for: FIXME!!! | |
1109 | ||
c906108c SS |
1110 | elfstab_build_psymtabs() handles STABS symbols; |
1111 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1112 | ||
1113 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1114 | like a COFF symbol table, but has only the minimal information necessary | |
1115 | for linking. We process this also, and use the information to | |
1116 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1117 | capability even for files compiled without -g. */ | |
1118 | ||
1119 | static void | |
f4352531 | 1120 | elf_symfile_read (struct objfile *objfile, int symfile_flags) |
c906108c | 1121 | { |
63524580 | 1122 | bfd *synth_abfd, *abfd = objfile->obfd; |
c906108c SS |
1123 | struct elfinfo ei; |
1124 | struct cleanup *back_to; | |
62553543 EZ |
1125 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1126 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1127 | asymbol *synthsyms; | |
d2f4b8fe | 1128 | struct dbx_symfile_info *dbx; |
c906108c | 1129 | |
45cfd468 DE |
1130 | if (symtab_create_debug) |
1131 | { | |
1132 | fprintf_unfiltered (gdb_stdlog, | |
1133 | "Reading minimal symbols of objfile %s ...\n", | |
4262abfb | 1134 | objfile_name (objfile)); |
45cfd468 DE |
1135 | } |
1136 | ||
c906108c | 1137 | init_minimal_symbol_collection (); |
56e290f4 | 1138 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
1139 | |
1140 | memset ((char *) &ei, 0, sizeof (ei)); | |
1141 | ||
0963b4bd | 1142 | /* Allocate struct to keep track of the symfile. */ |
d2f4b8fe TT |
1143 | dbx = XCNEW (struct dbx_symfile_info); |
1144 | set_objfile_data (objfile, dbx_objfile_data_key, dbx); | |
12b9c64f | 1145 | make_cleanup (free_elfinfo, (void *) objfile); |
c906108c | 1146 | |
3e43a32a | 1147 | /* Process the normal ELF symbol table first. This may write some |
d2f4b8fe TT |
1148 | chain of info into the dbx_symfile_info of the objfile, which can |
1149 | later be used by elfstab_offset_sections. */ | |
c906108c | 1150 | |
62553543 EZ |
1151 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
1152 | if (storage_needed < 0) | |
3e43a32a MS |
1153 | error (_("Can't read symbols from %s: %s"), |
1154 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1155 | bfd_errmsg (bfd_get_error ())); |
1156 | ||
1157 | if (storage_needed > 0) | |
1158 | { | |
1159 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
1160 | make_cleanup (xfree, symbol_table); | |
1161 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); | |
1162 | ||
1163 | if (symcount < 0) | |
3e43a32a MS |
1164 | error (_("Can't read symbols from %s: %s"), |
1165 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1166 | bfd_errmsg (bfd_get_error ())); |
1167 | ||
04a679b8 | 1168 | elf_symtab_read (objfile, ST_REGULAR, symcount, symbol_table, 0); |
62553543 | 1169 | } |
c906108c SS |
1170 | |
1171 | /* Add the dynamic symbols. */ | |
1172 | ||
62553543 EZ |
1173 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
1174 | ||
1175 | if (storage_needed > 0) | |
1176 | { | |
3f1eff0a JK |
1177 | /* Memory gets permanently referenced from ABFD after |
1178 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1179 | It happens only in the case when elf_slurp_reloc_table sees | |
1180 | asection->relocation NULL. Determining which section is asection is | |
1181 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1182 | implementation detail, though. */ | |
1183 | ||
1184 | dyn_symbol_table = bfd_alloc (abfd, storage_needed); | |
62553543 EZ |
1185 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
1186 | dyn_symbol_table); | |
1187 | ||
1188 | if (dynsymcount < 0) | |
3e43a32a MS |
1189 | error (_("Can't read symbols from %s: %s"), |
1190 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1191 | bfd_errmsg (bfd_get_error ())); |
1192 | ||
04a679b8 | 1193 | elf_symtab_read (objfile, ST_DYNAMIC, dynsymcount, dyn_symbol_table, 0); |
07be84bf JK |
1194 | |
1195 | elf_rel_plt_read (objfile, dyn_symbol_table); | |
62553543 EZ |
1196 | } |
1197 | ||
63524580 JK |
1198 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1199 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1200 | ||
1201 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1202 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1203 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1204 | read the code address from .opd while it reads the .symtab section from | |
1205 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1206 | ||
1207 | With SYNTH_ABFD the .opd section will be read from the original | |
1208 | backlinked binary where it is valid. */ | |
1209 | ||
1210 | if (objfile->separate_debug_objfile_backlink) | |
1211 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd; | |
1212 | else | |
1213 | synth_abfd = abfd; | |
1214 | ||
62553543 EZ |
1215 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1216 | ||
63524580 | 1217 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1218 | dynsymcount, dyn_symbol_table, |
1219 | &synthsyms); | |
1220 | if (synthcount > 0) | |
1221 | { | |
1222 | asymbol **synth_symbol_table; | |
1223 | long i; | |
1224 | ||
1225 | make_cleanup (xfree, synthsyms); | |
1226 | synth_symbol_table = xmalloc (sizeof (asymbol *) * synthcount); | |
1227 | for (i = 0; i < synthcount; i++) | |
9f20e3da | 1228 | synth_symbol_table[i] = synthsyms + i; |
62553543 | 1229 | make_cleanup (xfree, synth_symbol_table); |
3e43a32a MS |
1230 | elf_symtab_read (objfile, ST_SYNTHETIC, synthcount, |
1231 | synth_symbol_table, 1); | |
62553543 | 1232 | } |
c906108c | 1233 | |
7134143f DJ |
1234 | /* Install any minimal symbols that have been collected as the current |
1235 | minimal symbols for this objfile. The debug readers below this point | |
1236 | should not generate new minimal symbols; if they do it's their | |
1237 | responsibility to install them. "mdebug" appears to be the only one | |
1238 | which will do this. */ | |
1239 | ||
1240 | install_minimal_symbols (objfile); | |
1241 | do_cleanups (back_to); | |
1242 | ||
4f00dda3 DE |
1243 | if (symtab_create_debug) |
1244 | fprintf_unfiltered (gdb_stdlog, "Done reading minimal symbols.\n"); | |
1245 | ||
c906108c | 1246 | /* Now process debugging information, which is contained in |
0963b4bd | 1247 | special ELF sections. */ |
c906108c | 1248 | |
0963b4bd | 1249 | /* We first have to find them... */ |
12b9c64f | 1250 | bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); |
c906108c SS |
1251 | |
1252 | /* ELF debugging information is inserted into the psymtab in the | |
1253 | order of least informative first - most informative last. Since | |
1254 | the psymtab table is searched `most recent insertion first' this | |
1255 | increases the probability that more detailed debug information | |
1256 | for a section is found. | |
1257 | ||
1258 | For instance, an object file might contain both .mdebug (XCOFF) | |
1259 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1260 | (searched last) and DWARF2 is inserted last (searched first). If | |
1261 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1262 | an included file XCOFF info is useless. */ |
c906108c SS |
1263 | |
1264 | if (ei.mdebugsect) | |
1265 | { | |
1266 | const struct ecoff_debug_swap *swap; | |
1267 | ||
1268 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 1269 | information. */ |
c906108c SS |
1270 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1271 | if (swap) | |
d4f3574e | 1272 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1273 | } |
1274 | if (ei.stabsect) | |
1275 | { | |
1276 | asection *str_sect; | |
1277 | ||
1278 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 1279 | a separate section. */ |
c906108c SS |
1280 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1281 | ||
1282 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1283 | if (str_sect) | |
1284 | elfstab_build_psymtabs (objfile, | |
086df311 | 1285 | ei.stabsect, |
c906108c SS |
1286 | str_sect->filepos, |
1287 | bfd_section_size (abfd, str_sect)); | |
1288 | } | |
9291a0cd | 1289 | |
251d32d9 | 1290 | if (dwarf2_has_info (objfile, NULL)) |
b11896a5 | 1291 | { |
3e03848b JK |
1292 | /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF debug |
1293 | information present in OBJFILE. If there is such debug info present | |
1294 | never use .gdb_index. */ | |
1295 | ||
1296 | if (!objfile_has_partial_symbols (objfile) | |
1297 | && dwarf2_initialize_objfile (objfile)) | |
8fb8eb5c | 1298 | objfile_set_sym_fns (objfile, &elf_sym_fns_gdb_index); |
b11896a5 TT |
1299 | else |
1300 | { | |
1301 | /* It is ok to do this even if the stabs reader made some | |
1302 | partial symbols, because OBJF_PSYMTABS_READ has not been | |
1303 | set, and so our lazy reader function will still be called | |
1304 | when needed. */ | |
8fb8eb5c | 1305 | objfile_set_sym_fns (objfile, &elf_sym_fns_lazy_psyms); |
b11896a5 TT |
1306 | } |
1307 | } | |
3e43a32a MS |
1308 | /* If the file has its own symbol tables it has no separate debug |
1309 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1310 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
8a92335b JK |
1311 | `.note.gnu.build-id'. |
1312 | ||
1313 | .gnu_debugdata is !objfile_has_partial_symbols because it contains only | |
1314 | .symtab, not .debug_* section. But if we already added .gnu_debugdata as | |
1315 | an objfile via find_separate_debug_file_in_section there was no separate | |
1316 | debug info available. Therefore do not attempt to search for another one, | |
1317 | objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to | |
1318 | be NULL and we would possibly violate it. */ | |
1319 | ||
1320 | else if (!objfile_has_partial_symbols (objfile) | |
1321 | && objfile->separate_debug_objfile == NULL | |
1322 | && objfile->separate_debug_objfile_backlink == NULL) | |
9cce227f TG |
1323 | { |
1324 | char *debugfile; | |
1325 | ||
1326 | debugfile = find_separate_debug_file_by_buildid (objfile); | |
1327 | ||
1328 | if (debugfile == NULL) | |
1329 | debugfile = find_separate_debug_file_by_debuglink (objfile); | |
1330 | ||
1331 | if (debugfile) | |
1332 | { | |
8ac244b4 | 1333 | struct cleanup *cleanup = make_cleanup (xfree, debugfile); |
9cce227f | 1334 | bfd *abfd = symfile_bfd_open (debugfile); |
d7f9d729 | 1335 | |
8ac244b4 | 1336 | make_cleanup_bfd_unref (abfd); |
24ba069a | 1337 | symbol_file_add_separate (abfd, debugfile, symfile_flags, objfile); |
8ac244b4 | 1338 | do_cleanups (cleanup); |
9cce227f TG |
1339 | } |
1340 | } | |
c906108c SS |
1341 | } |
1342 | ||
b11896a5 TT |
1343 | /* Callback to lazily read psymtabs. */ |
1344 | ||
1345 | static void | |
1346 | read_psyms (struct objfile *objfile) | |
1347 | { | |
251d32d9 | 1348 | if (dwarf2_has_info (objfile, NULL)) |
b11896a5 TT |
1349 | dwarf2_build_psymtabs (objfile); |
1350 | } | |
1351 | ||
d2f4b8fe TT |
1352 | /* This cleans up the objfile's dbx symfile info, and the chain of |
1353 | stab_section_info's, that might be dangling from it. */ | |
c906108c SS |
1354 | |
1355 | static void | |
12b9c64f | 1356 | free_elfinfo (void *objp) |
c906108c | 1357 | { |
c5aa993b | 1358 | struct objfile *objfile = (struct objfile *) objp; |
d2f4b8fe | 1359 | struct dbx_symfile_info *dbxinfo = DBX_SYMFILE_INFO (objfile); |
c906108c SS |
1360 | struct stab_section_info *ssi, *nssi; |
1361 | ||
1362 | ssi = dbxinfo->stab_section_info; | |
1363 | while (ssi) | |
1364 | { | |
1365 | nssi = ssi->next; | |
2dc74dc1 | 1366 | xfree (ssi); |
c906108c SS |
1367 | ssi = nssi; |
1368 | } | |
1369 | ||
1370 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
1371 | } | |
1372 | ||
1373 | ||
1374 | /* Initialize anything that needs initializing when a completely new symbol | |
1375 | file is specified (not just adding some symbols from another file, e.g. a | |
1376 | shared library). | |
1377 | ||
3e43a32a MS |
1378 | We reinitialize buildsym, since we may be reading stabs from an ELF |
1379 | file. */ | |
c906108c SS |
1380 | |
1381 | static void | |
fba45db2 | 1382 | elf_new_init (struct objfile *ignore) |
c906108c SS |
1383 | { |
1384 | stabsread_new_init (); | |
1385 | buildsym_new_init (); | |
1386 | } | |
1387 | ||
1388 | /* Perform any local cleanups required when we are done with a particular | |
1389 | objfile. I.E, we are in the process of discarding all symbol information | |
1390 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1391 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1392 | |
1393 | static void | |
fba45db2 | 1394 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1395 | { |
fe3e1990 | 1396 | dwarf2_free_objfile (objfile); |
c906108c SS |
1397 | } |
1398 | ||
1399 | /* ELF specific initialization routine for reading symbols. | |
1400 | ||
1401 | It is passed a pointer to a struct sym_fns which contains, among other | |
1402 | things, the BFD for the file whose symbols are being read, and a slot for | |
1403 | a pointer to "private data" which we can fill with goodies. | |
1404 | ||
1405 | For now at least, we have nothing in particular to do, so this function is | |
0963b4bd | 1406 | just a stub. */ |
c906108c SS |
1407 | |
1408 | static void | |
fba45db2 | 1409 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
1410 | { |
1411 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
1412 | find this causes a significant slowdown in gdb then we could | |
1413 | set it in the debug symbol readers only when necessary. */ | |
1414 | objfile->flags |= OBJF_REORDERED; | |
1415 | } | |
1416 | ||
1417 | /* When handling an ELF file that contains Sun STABS debug info, | |
1418 | some of the debug info is relative to the particular chunk of the | |
1419 | section that was generated in its individual .o file. E.g. | |
1420 | offsets to static variables are relative to the start of the data | |
1421 | segment *for that module before linking*. This information is | |
1422 | painfully squirreled away in the ELF symbol table as local symbols | |
1423 | with wierd names. Go get 'em when needed. */ | |
1424 | ||
1425 | void | |
fba45db2 | 1426 | elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
c906108c | 1427 | { |
72b9f47f | 1428 | const char *filename = pst->filename; |
d2f4b8fe | 1429 | struct dbx_symfile_info *dbx = DBX_SYMFILE_INFO (objfile); |
c906108c SS |
1430 | struct stab_section_info *maybe = dbx->stab_section_info; |
1431 | struct stab_section_info *questionable = 0; | |
1432 | int i; | |
c906108c SS |
1433 | |
1434 | /* The ELF symbol info doesn't include path names, so strip the path | |
1435 | (if any) from the psymtab filename. */ | |
0ba1096a | 1436 | filename = lbasename (filename); |
c906108c SS |
1437 | |
1438 | /* FIXME: This linear search could speed up significantly | |
1439 | if it was chained in the right order to match how we search it, | |
0963b4bd | 1440 | and if we unchained when we found a match. */ |
c906108c SS |
1441 | for (; maybe; maybe = maybe->next) |
1442 | { | |
1443 | if (filename[0] == maybe->filename[0] | |
0ba1096a | 1444 | && filename_cmp (filename, maybe->filename) == 0) |
c906108c SS |
1445 | { |
1446 | /* We found a match. But there might be several source files | |
1447 | (from different directories) with the same name. */ | |
1448 | if (0 == maybe->found) | |
1449 | break; | |
c5aa993b | 1450 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
1451 | } |
1452 | } | |
1453 | ||
1454 | if (maybe == 0 && questionable != 0) | |
1455 | { | |
23136709 | 1456 | complaint (&symfile_complaints, |
3e43a32a MS |
1457 | _("elf/stab section information questionable for %s"), |
1458 | filename); | |
c906108c SS |
1459 | maybe = questionable; |
1460 | } | |
1461 | ||
1462 | if (maybe) | |
1463 | { | |
1464 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
1465 | maybe->found++; | |
1466 | pst->section_offsets = (struct section_offsets *) | |
dea91a5c | 1467 | obstack_alloc (&objfile->objfile_obstack, |
a39a16c4 MM |
1468 | SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
1469 | for (i = 0; i < maybe->num_sections; i++) | |
a4c8257b | 1470 | (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
c906108c SS |
1471 | return; |
1472 | } | |
1473 | ||
1474 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 1475 | if (dbx->stab_section_info) /* If there *is* any info, */ |
23136709 | 1476 | complaint (&symfile_complaints, |
e2e0b3e5 | 1477 | _("elf/stab section information missing for %s"), filename); |
c906108c | 1478 | } |
55aa24fb SDJ |
1479 | |
1480 | /* Implementation of `sym_get_probes', as documented in symfile.h. */ | |
1481 | ||
1482 | static VEC (probe_p) * | |
1483 | elf_get_probes (struct objfile *objfile) | |
1484 | { | |
1485 | VEC (probe_p) *probes_per_objfile; | |
1486 | ||
1487 | /* Have we parsed this objfile's probes already? */ | |
1488 | probes_per_objfile = objfile_data (objfile, probe_key); | |
1489 | ||
1490 | if (!probes_per_objfile) | |
1491 | { | |
1492 | int ix; | |
1493 | const struct probe_ops *probe_ops; | |
1494 | ||
1495 | /* Here we try to gather information about all types of probes from the | |
1496 | objfile. */ | |
1497 | for (ix = 0; VEC_iterate (probe_ops_cp, all_probe_ops, ix, probe_ops); | |
1498 | ix++) | |
1499 | probe_ops->get_probes (&probes_per_objfile, objfile); | |
1500 | ||
1501 | if (probes_per_objfile == NULL) | |
1502 | { | |
1503 | VEC_reserve (probe_p, probes_per_objfile, 1); | |
1504 | gdb_assert (probes_per_objfile != NULL); | |
1505 | } | |
1506 | ||
1507 | set_objfile_data (objfile, probe_key, probes_per_objfile); | |
1508 | } | |
1509 | ||
1510 | return probes_per_objfile; | |
1511 | } | |
1512 | ||
1513 | /* Implementation of `sym_get_probe_argument_count', as documented in | |
1514 | symfile.h. */ | |
1515 | ||
1516 | static unsigned | |
6bac7473 | 1517 | elf_get_probe_argument_count (struct probe *probe) |
55aa24fb | 1518 | { |
6bac7473 | 1519 | return probe->pops->get_probe_argument_count (probe); |
55aa24fb SDJ |
1520 | } |
1521 | ||
25f9533e SDJ |
1522 | /* Implementation of `sym_can_evaluate_probe_arguments', as documented in |
1523 | symfile.h. */ | |
1524 | ||
1525 | static int | |
1526 | elf_can_evaluate_probe_arguments (struct probe *probe) | |
1527 | { | |
1528 | return probe->pops->can_evaluate_probe_arguments (probe); | |
1529 | } | |
1530 | ||
55aa24fb SDJ |
1531 | /* Implementation of `sym_evaluate_probe_argument', as documented in |
1532 | symfile.h. */ | |
1533 | ||
1534 | static struct value * | |
6bac7473 | 1535 | elf_evaluate_probe_argument (struct probe *probe, unsigned n) |
55aa24fb | 1536 | { |
6bac7473 | 1537 | return probe->pops->evaluate_probe_argument (probe, n); |
55aa24fb SDJ |
1538 | } |
1539 | ||
1540 | /* Implementation of `sym_compile_to_ax', as documented in symfile.h. */ | |
1541 | ||
1542 | static void | |
6bac7473 | 1543 | elf_compile_to_ax (struct probe *probe, |
55aa24fb SDJ |
1544 | struct agent_expr *expr, |
1545 | struct axs_value *value, | |
1546 | unsigned n) | |
1547 | { | |
6bac7473 | 1548 | probe->pops->compile_to_ax (probe, expr, value, n); |
55aa24fb SDJ |
1549 | } |
1550 | ||
1551 | /* Implementation of `sym_relocate_probe', as documented in symfile.h. */ | |
1552 | ||
1553 | static void | |
1554 | elf_symfile_relocate_probe (struct objfile *objfile, | |
3189cb12 DE |
1555 | const struct section_offsets *new_offsets, |
1556 | const struct section_offsets *delta) | |
55aa24fb SDJ |
1557 | { |
1558 | int ix; | |
1559 | VEC (probe_p) *probes = objfile_data (objfile, probe_key); | |
1560 | struct probe *probe; | |
1561 | ||
1562 | for (ix = 0; VEC_iterate (probe_p, probes, ix, probe); ix++) | |
1563 | probe->pops->relocate (probe, ANOFFSET (delta, SECT_OFF_TEXT (objfile))); | |
1564 | } | |
1565 | ||
1566 | /* Helper function used to free the space allocated for storing SystemTap | |
1567 | probe information. */ | |
1568 | ||
1569 | static void | |
1570 | probe_key_free (struct objfile *objfile, void *d) | |
1571 | { | |
1572 | int ix; | |
1573 | VEC (probe_p) *probes = d; | |
1574 | struct probe *probe; | |
1575 | ||
1576 | for (ix = 0; VEC_iterate (probe_p, probes, ix, probe); ix++) | |
1577 | probe->pops->destroy (probe); | |
1578 | ||
1579 | VEC_free (probe_p, probes); | |
1580 | } | |
1581 | ||
c906108c | 1582 | \f |
55aa24fb SDJ |
1583 | |
1584 | /* Implementation `sym_probe_fns', as documented in symfile.h. */ | |
1585 | ||
1586 | static const struct sym_probe_fns elf_probe_fns = | |
1587 | { | |
25f9533e SDJ |
1588 | elf_get_probes, /* sym_get_probes */ |
1589 | elf_get_probe_argument_count, /* sym_get_probe_argument_count */ | |
1590 | elf_can_evaluate_probe_arguments, /* sym_can_evaluate_probe_arguments */ | |
1591 | elf_evaluate_probe_argument, /* sym_evaluate_probe_argument */ | |
1592 | elf_compile_to_ax, /* sym_compile_to_ax */ | |
1593 | elf_symfile_relocate_probe, /* sym_relocate_probe */ | |
55aa24fb SDJ |
1594 | }; |
1595 | ||
c906108c SS |
1596 | /* Register that we are able to handle ELF object file formats. */ |
1597 | ||
00b5771c | 1598 | static const struct sym_fns elf_sym_fns = |
c906108c | 1599 | { |
3e43a32a MS |
1600 | elf_new_init, /* init anything gbl to entire symtab */ |
1601 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1602 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 TT |
1603 | NULL, /* sym_read_psymbols */ |
1604 | elf_symfile_finish, /* finished with file, cleanup */ | |
1605 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1606 | elf_symfile_segments, /* Get segment information from a file. */ | |
1607 | NULL, | |
1608 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1609 | &elf_probe_fns, /* sym_probe_fns */ |
b11896a5 TT |
1610 | &psym_functions |
1611 | }; | |
1612 | ||
1613 | /* The same as elf_sym_fns, but not registered and lazily reads | |
1614 | psymbols. */ | |
1615 | ||
1616 | static const struct sym_fns elf_sym_fns_lazy_psyms = | |
1617 | { | |
b11896a5 TT |
1618 | elf_new_init, /* init anything gbl to entire symtab */ |
1619 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1620 | elf_symfile_read, /* read a symbol file into symtab */ | |
1621 | read_psyms, /* sym_read_psymbols */ | |
3e43a32a MS |
1622 | elf_symfile_finish, /* finished with file, cleanup */ |
1623 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1624 | elf_symfile_segments, /* Get segment information from a file. */ | |
1625 | NULL, | |
1626 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1627 | &elf_probe_fns, /* sym_probe_fns */ |
00b5771c | 1628 | &psym_functions |
c906108c SS |
1629 | }; |
1630 | ||
9291a0cd TT |
1631 | /* The same as elf_sym_fns, but not registered and uses the |
1632 | DWARF-specific GNU index rather than psymtab. */ | |
00b5771c | 1633 | static const struct sym_fns elf_sym_fns_gdb_index = |
9291a0cd | 1634 | { |
3e43a32a MS |
1635 | elf_new_init, /* init anything gbl to entire symab */ |
1636 | elf_symfile_init, /* read initial info, setup for sym_red() */ | |
1637 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 | 1638 | NULL, /* sym_read_psymbols */ |
3e43a32a MS |
1639 | elf_symfile_finish, /* finished with file, cleanup */ |
1640 | default_symfile_offsets, /* Translate ext. to int. relocatin */ | |
1641 | elf_symfile_segments, /* Get segment information from a file. */ | |
1642 | NULL, | |
1643 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1644 | &elf_probe_fns, /* sym_probe_fns */ |
00b5771c | 1645 | &dwarf2_gdb_index_functions |
9291a0cd TT |
1646 | }; |
1647 | ||
07be84bf JK |
1648 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1649 | ||
1650 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1651 | { | |
1652 | elf_gnu_ifunc_resolve_addr, | |
1653 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1654 | elf_gnu_ifunc_resolver_stop, |
1655 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1656 | }; |
1657 | ||
c906108c | 1658 | void |
fba45db2 | 1659 | _initialize_elfread (void) |
c906108c | 1660 | { |
55aa24fb | 1661 | probe_key = register_objfile_data_with_cleanup (NULL, probe_key_free); |
c256e171 | 1662 | add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns); |
07be84bf JK |
1663 | |
1664 | elf_objfile_gnu_ifunc_cache_data = register_objfile_data (); | |
1665 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; | |
c906108c | 1666 | } |