Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
b811d2c2 | 3 | Copyright (C) 1991-2020 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" | |
c906108c | 24 | #include "elf-bfd.h" |
31d99776 DJ |
25 | #include "elf/common.h" |
26 | #include "elf/internal.h" | |
c906108c | 27 | #include "elf/mips.h" |
4de283e4 TT |
28 | #include "symtab.h" |
29 | #include "symfile.h" | |
30 | #include "objfiles.h" | |
31 | #include "stabsread.h" | |
4de283e4 TT |
32 | #include "complaints.h" |
33 | #include "demangle.h" | |
34 | #include "psympriv.h" | |
35 | #include "filenames.h" | |
36 | #include "probe.h" | |
37 | #include "arch-utils.h" | |
07be84bf | 38 | #include "gdbtypes.h" |
4de283e4 | 39 | #include "value.h" |
07be84bf | 40 | #include "infcall.h" |
4de283e4 | 41 | #include "gdbthread.h" |
00431a78 | 42 | #include "inferior.h" |
4de283e4 TT |
43 | #include "regcache.h" |
44 | #include "bcache.h" | |
45 | #include "gdb_bfd.h" | |
46 | #include "build-id.h" | |
f00aae0f | 47 | #include "location.h" |
4de283e4 | 48 | #include "auxv.h" |
0e8f53ba | 49 | #include "mdebugread.h" |
30d1f018 | 50 | #include "ctfread.h" |
31edb802 | 51 | #include "gdbsupport/gdb_string_view.h" |
0d79cdc4 AM |
52 | #include "gdbsupport/scoped_fd.h" |
53 | #include "debuginfod-support.h" | |
c906108c | 54 | |
3c0aa29a PA |
55 | /* Forward declarations. */ |
56 | extern const struct sym_fns elf_sym_fns_gdb_index; | |
57 | extern const struct sym_fns elf_sym_fns_debug_names; | |
58 | extern const struct sym_fns elf_sym_fns_lazy_psyms; | |
59 | ||
c906108c | 60 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 61 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
62 | It's local to elf_symfile_read. */ |
63 | ||
c5aa993b JM |
64 | struct elfinfo |
65 | { | |
c5aa993b | 66 | asection *stabsect; /* Section pointer for .stab section */ |
c5aa993b | 67 | asection *mdebugsect; /* Section pointer for .mdebug section */ |
30d1f018 | 68 | asection *ctfsect; /* Section pointer for .ctf section */ |
c5aa993b | 69 | }; |
c906108c | 70 | |
814cf43a TT |
71 | /* Type for per-BFD data. */ |
72 | ||
73 | typedef std::vector<std::unique_ptr<probe>> elfread_data; | |
74 | ||
5d9cf8a4 | 75 | /* Per-BFD data for probe info. */ |
55aa24fb | 76 | |
814cf43a | 77 | static const struct bfd_key<elfread_data> probe_key; |
55aa24fb | 78 | |
07be84bf JK |
79 | /* Minimal symbols located at the GOT entries for .plt - that is the real |
80 | pointer where the given entry will jump to. It gets updated by the real | |
81 | function address during lazy ld.so resolving in the inferior. These | |
82 | minimal symbols are indexed for <tab>-completion. */ | |
83 | ||
84 | #define SYMBOL_GOT_PLT_SUFFIX "@got.plt" | |
85 | ||
31d99776 DJ |
86 | /* Locate the segments in ABFD. */ |
87 | ||
88 | static struct symfile_segment_data * | |
89 | elf_symfile_segments (bfd *abfd) | |
90 | { | |
91 | Elf_Internal_Phdr *phdrs, **segments; | |
92 | long phdrs_size; | |
93 | int num_phdrs, num_segments, num_sections, i; | |
94 | asection *sect; | |
95 | struct symfile_segment_data *data; | |
96 | ||
97 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
98 | if (phdrs_size == -1) | |
99 | return NULL; | |
100 | ||
224c3ddb | 101 | phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size); |
31d99776 DJ |
102 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); |
103 | if (num_phdrs == -1) | |
104 | return NULL; | |
105 | ||
106 | num_segments = 0; | |
8d749320 | 107 | segments = XALLOCAVEC (Elf_Internal_Phdr *, num_phdrs); |
31d99776 DJ |
108 | for (i = 0; i < num_phdrs; i++) |
109 | if (phdrs[i].p_type == PT_LOAD) | |
110 | segments[num_segments++] = &phdrs[i]; | |
111 | ||
112 | if (num_segments == 0) | |
113 | return NULL; | |
114 | ||
41bf6aca | 115 | data = XCNEW (struct symfile_segment_data); |
31d99776 | 116 | data->num_segments = num_segments; |
fc270c35 TT |
117 | data->segment_bases = XCNEWVEC (CORE_ADDR, num_segments); |
118 | data->segment_sizes = XCNEWVEC (CORE_ADDR, num_segments); | |
31d99776 DJ |
119 | |
120 | for (i = 0; i < num_segments; i++) | |
121 | { | |
122 | data->segment_bases[i] = segments[i]->p_vaddr; | |
123 | data->segment_sizes[i] = segments[i]->p_memsz; | |
124 | } | |
125 | ||
126 | num_sections = bfd_count_sections (abfd); | |
fc270c35 | 127 | data->segment_info = XCNEWVEC (int, num_sections); |
31d99776 DJ |
128 | |
129 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
130 | { | |
131 | int j; | |
31d99776 | 132 | |
fd361982 | 133 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
31d99776 DJ |
134 | continue; |
135 | ||
62b74cb8 | 136 | Elf_Internal_Shdr *this_hdr = &elf_section_data (sect)->this_hdr; |
31d99776 DJ |
137 | |
138 | for (j = 0; j < num_segments; j++) | |
62b74cb8 | 139 | if (ELF_SECTION_IN_SEGMENT (this_hdr, segments[j])) |
31d99776 DJ |
140 | { |
141 | data->segment_info[i] = j + 1; | |
142 | break; | |
143 | } | |
144 | ||
ad09a548 DJ |
145 | /* We should have found a segment for every non-empty section. |
146 | If we haven't, we will not relocate this section by any | |
147 | offsets we apply to the segments. As an exception, do not | |
148 | warn about SHT_NOBITS sections; in normal ELF execution | |
149 | environments, SHT_NOBITS means zero-initialized and belongs | |
150 | in a segment, but in no-OS environments some tools (e.g. ARM | |
151 | RealView) use SHT_NOBITS for uninitialized data. Since it is | |
152 | uninitialized, it doesn't need a program header. Such | |
153 | binaries are not relocatable. */ | |
fd361982 AM |
154 | if (bfd_section_size (sect) > 0 && j == num_segments |
155 | && (bfd_section_flags (sect) & SEC_LOAD) != 0) | |
28ee876a | 156 | warning (_("Loadable section \"%s\" outside of ELF segments"), |
fd361982 | 157 | bfd_section_name (sect)); |
31d99776 DJ |
158 | } |
159 | ||
160 | return data; | |
161 | } | |
162 | ||
c906108c SS |
163 | /* We are called once per section from elf_symfile_read. We |
164 | need to examine each section we are passed, check to see | |
165 | if it is something we are interested in processing, and | |
166 | if so, stash away some access information for the section. | |
167 | ||
168 | For now we recognize the dwarf debug information sections and | |
169 | line number sections from matching their section names. The | |
170 | ELF definition is no real help here since it has no direct | |
171 | knowledge of DWARF (by design, so any debugging format can be | |
172 | used). | |
173 | ||
174 | We also recognize the ".stab" sections used by the Sun compilers | |
175 | released with Solaris 2. | |
176 | ||
177 | FIXME: The section names should not be hardwired strings (what | |
178 | should they be? I don't think most object file formats have enough | |
0963b4bd | 179 | section flags to specify what kind of debug section it is. |
c906108c SS |
180 | -kingdon). */ |
181 | ||
182 | static void | |
12b9c64f | 183 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
c906108c | 184 | { |
52f0bd74 | 185 | struct elfinfo *ei; |
c906108c SS |
186 | |
187 | ei = (struct elfinfo *) eip; | |
7ce59000 | 188 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 189 | { |
c5aa993b | 190 | ei->stabsect = sectp; |
c906108c | 191 | } |
6314a349 | 192 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 193 | { |
c5aa993b | 194 | ei->mdebugsect = sectp; |
c906108c | 195 | } |
30d1f018 WP |
196 | else if (strcmp (sectp->name, ".ctf") == 0) |
197 | { | |
198 | ei->ctfsect = sectp; | |
199 | } | |
c906108c SS |
200 | } |
201 | ||
c906108c | 202 | static struct minimal_symbol * |
8dddcb8f | 203 | record_minimal_symbol (minimal_symbol_reader &reader, |
31edb802 | 204 | gdb::string_view name, bool copy_name, |
04a679b8 | 205 | CORE_ADDR address, |
f594e5e9 MC |
206 | enum minimal_symbol_type ms_type, |
207 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 208 | { |
5e2b427d UW |
209 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
210 | ||
0875794a JK |
211 | if (ms_type == mst_text || ms_type == mst_file_text |
212 | || ms_type == mst_text_gnu_ifunc) | |
85ddcc70 | 213 | address = gdbarch_addr_bits_remove (gdbarch, address); |
c906108c | 214 | |
44e4c775 AB |
215 | /* We only setup section information for allocatable sections. Usually |
216 | we'd only expect to find msymbols for allocatable sections, but if the | |
217 | ELF is malformed then this might not be the case. In that case don't | |
218 | create an msymbol that references an uninitialised section object. */ | |
219 | int section_index = 0; | |
220 | if ((bfd_section_flags (bfd_section) & SEC_ALLOC) == SEC_ALLOC) | |
221 | section_index = gdb_bfd_section_index (objfile->obfd, bfd_section); | |
222 | ||
4b610737 | 223 | struct minimal_symbol *result |
44e4c775 | 224 | = reader.record_full (name, copy_name, address, ms_type, section_index); |
4b610737 TT |
225 | if ((objfile->flags & OBJF_MAINLINE) == 0 |
226 | && (ms_type == mst_data || ms_type == mst_bss)) | |
227 | result->maybe_copied = 1; | |
228 | ||
229 | return result; | |
c906108c SS |
230 | } |
231 | ||
7f86f058 | 232 | /* Read the symbol table of an ELF file. |
c906108c | 233 | |
62553543 | 234 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
235 | symbol table contains regular, dynamic, or synthetic symbols, add all |
236 | the global function and data symbols to the minimal symbol table. | |
c906108c | 237 | |
c5aa993b JM |
238 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
239 | defined in the ELF symbol table, which can be used to locate | |
240 | the beginnings of sections from each ".o" file that was linked to | |
241 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 242 | in data structures hung off the objfile's private data. */ |
c906108c | 243 | |
6f610d07 UW |
244 | #define ST_REGULAR 0 |
245 | #define ST_DYNAMIC 1 | |
246 | #define ST_SYNTHETIC 2 | |
247 | ||
c906108c | 248 | static void |
8dddcb8f TT |
249 | elf_symtab_read (minimal_symbol_reader &reader, |
250 | struct objfile *objfile, int type, | |
04a679b8 | 251 | long number_of_symbols, asymbol **symbol_table, |
ce6c454e | 252 | bool copy_names) |
c906108c | 253 | { |
5e2b427d | 254 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
c906108c | 255 | asymbol *sym; |
c906108c | 256 | long i; |
c906108c SS |
257 | CORE_ADDR symaddr; |
258 | enum minimal_symbol_type ms_type; | |
18a94d75 DE |
259 | /* Name of the last file symbol. This is either a constant string or is |
260 | saved on the objfile's filename cache. */ | |
0af1e9a5 | 261 | const char *filesymname = ""; |
d4f3574e | 262 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
3e29f34a MR |
263 | int elf_make_msymbol_special_p |
264 | = gdbarch_elf_make_msymbol_special_p (gdbarch); | |
c5aa993b | 265 | |
0cc7b392 | 266 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 267 | { |
0cc7b392 DJ |
268 | sym = symbol_table[i]; |
269 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 270 | { |
0cc7b392 | 271 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 272 | that are null strings (may happen). */ |
0cc7b392 DJ |
273 | continue; |
274 | } | |
c906108c | 275 | |
74763737 DJ |
276 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
277 | symbols which do not correspond to objects in the symbol table, | |
278 | but have some other target-specific meaning. */ | |
279 | if (bfd_is_target_special_symbol (objfile->obfd, sym)) | |
60c5725c DJ |
280 | { |
281 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
282 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
283 | continue; | |
284 | } | |
74763737 | 285 | |
6f610d07 | 286 | if (type == ST_DYNAMIC |
45dfa85a | 287 | && sym->section == bfd_und_section_ptr |
0cc7b392 DJ |
288 | && (sym->flags & BSF_FUNCTION)) |
289 | { | |
290 | struct minimal_symbol *msym; | |
02c75f72 | 291 | bfd *abfd = objfile->obfd; |
dea91a5c | 292 | asection *sect; |
0cc7b392 DJ |
293 | |
294 | /* Symbol is a reference to a function defined in | |
295 | a shared library. | |
296 | If its value is non zero then it is usually the address | |
297 | of the corresponding entry in the procedure linkage table, | |
298 | plus the desired section offset. | |
299 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 300 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
301 | for this symbol in the executable file, so we skip it. */ |
302 | symaddr = sym->value; | |
303 | if (symaddr == 0) | |
304 | continue; | |
02c75f72 UW |
305 | |
306 | /* sym->section is the undefined section. However, we want to | |
307 | record the section where the PLT stub resides with the | |
308 | minimal symbol. Search the section table for the one that | |
309 | covers the stub's address. */ | |
310 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
311 | { | |
fd361982 | 312 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
02c75f72 UW |
313 | continue; |
314 | ||
fd361982 AM |
315 | if (symaddr >= bfd_section_vma (sect) |
316 | && symaddr < bfd_section_vma (sect) | |
317 | + bfd_section_size (sect)) | |
02c75f72 UW |
318 | break; |
319 | } | |
320 | if (!sect) | |
321 | continue; | |
322 | ||
828cfa8d JB |
323 | /* On ia64-hpux, we have discovered that the system linker |
324 | adds undefined symbols with nonzero addresses that cannot | |
325 | be right (their address points inside the code of another | |
326 | function in the .text section). This creates problems | |
327 | when trying to determine which symbol corresponds to | |
328 | a given address. | |
329 | ||
330 | We try to detect those buggy symbols by checking which | |
331 | section we think they correspond to. Normally, PLT symbols | |
332 | are stored inside their own section, and the typical name | |
333 | for that section is ".plt". So, if there is a ".plt" | |
334 | section, and yet the section name of our symbol does not | |
335 | start with ".plt", we ignore that symbol. */ | |
61012eef | 336 | if (!startswith (sect->name, ".plt") |
828cfa8d JB |
337 | && bfd_get_section_by_name (abfd, ".plt") != NULL) |
338 | continue; | |
339 | ||
0cc7b392 | 340 | msym = record_minimal_symbol |
31edb802 | 341 | (reader, sym->name, copy_names, |
04a679b8 | 342 | symaddr, mst_solib_trampoline, sect, objfile); |
0cc7b392 | 343 | if (msym != NULL) |
9b807e7b MR |
344 | { |
345 | msym->filename = filesymname; | |
3e29f34a MR |
346 | if (elf_make_msymbol_special_p) |
347 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
9b807e7b | 348 | } |
0cc7b392 DJ |
349 | continue; |
350 | } | |
c906108c | 351 | |
0cc7b392 DJ |
352 | /* If it is a nonstripped executable, do not enter dynamic |
353 | symbols, as the dynamic symbol table is usually a subset | |
354 | of the main symbol table. */ | |
6f610d07 | 355 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
356 | continue; |
357 | if (sym->flags & BSF_FILE) | |
be1e3d3e | 358 | filesymname = objfile->intern (sym->name); |
0cc7b392 DJ |
359 | else if (sym->flags & BSF_SECTION_SYM) |
360 | continue; | |
bb869963 SDJ |
361 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK |
362 | | BSF_GNU_UNIQUE)) | |
0cc7b392 DJ |
363 | { |
364 | struct minimal_symbol *msym; | |
365 | ||
366 | /* Select global/local/weak symbols. Note that bfd puts abs | |
367 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
368 | interested in will have a section. */ |
369 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 370 | symaddr = sym->value + sym->section->vma; |
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. */ |
45dfa85a | 374 | if (sym->section == bfd_abs_section_ptr) |
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; | |
c906108c | 406 | } |
0cc7b392 DJ |
407 | } |
408 | else if (sym->section->flags & SEC_CODE) | |
409 | { | |
bb869963 | 410 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 411 | { |
0875794a JK |
412 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
413 | ms_type = mst_text_gnu_ifunc; | |
414 | else | |
415 | ms_type = mst_text; | |
0cc7b392 | 416 | } |
90359a16 JK |
417 | /* The BSF_SYNTHETIC check is there to omit ppc64 function |
418 | descriptors mistaken for static functions starting with 'L'. | |
419 | */ | |
420 | else if ((sym->name[0] == '.' && sym->name[1] == 'L' | |
421 | && (sym->flags & BSF_SYNTHETIC) == 0) | |
0cc7b392 DJ |
422 | || ((sym->flags & BSF_LOCAL) |
423 | && sym->name[0] == '$' | |
424 | && sym->name[1] == 'L')) | |
425 | /* Looks like a compiler-generated label. Skip | |
426 | it. The assembler should be skipping these (to | |
427 | keep executables small), but apparently with | |
428 | gcc on the (deleted) delta m88k SVR4, it loses. | |
429 | So to have us check too should be harmless (but | |
430 | I encourage people to fix this in the assembler | |
431 | instead of adding checks here). */ | |
432 | continue; | |
433 | else | |
434 | { | |
435 | ms_type = mst_file_text; | |
c906108c | 436 | } |
0cc7b392 DJ |
437 | } |
438 | else if (sym->section->flags & SEC_ALLOC) | |
439 | { | |
bb869963 | 440 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 441 | { |
f50776aa PA |
442 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
443 | { | |
444 | ms_type = mst_data_gnu_ifunc; | |
445 | } | |
446 | else if (sym->section->flags & SEC_LOAD) | |
c906108c | 447 | { |
0cc7b392 | 448 | ms_type = mst_data; |
c906108c | 449 | } |
c906108c SS |
450 | else |
451 | { | |
0cc7b392 | 452 | ms_type = mst_bss; |
c906108c SS |
453 | } |
454 | } | |
0cc7b392 | 455 | else if (sym->flags & BSF_LOCAL) |
c906108c | 456 | { |
0cc7b392 DJ |
457 | if (sym->section->flags & SEC_LOAD) |
458 | { | |
459 | ms_type = mst_file_data; | |
c906108c SS |
460 | } |
461 | else | |
462 | { | |
0cc7b392 | 463 | ms_type = mst_file_bss; |
c906108c SS |
464 | } |
465 | } | |
466 | else | |
467 | { | |
0cc7b392 | 468 | ms_type = mst_unknown; |
c906108c | 469 | } |
0cc7b392 DJ |
470 | } |
471 | else | |
472 | { | |
473 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 474 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
475 | hob with actions like finding what function the PC |
476 | is in. Ignore them if they aren't text, data, or bss. */ | |
477 | /* ms_type = mst_unknown; */ | |
0963b4bd | 478 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
479 | } |
480 | msym = record_minimal_symbol | |
31edb802 | 481 | (reader, sym->name, copy_names, symaddr, |
0cc7b392 | 482 | ms_type, sym->section, objfile); |
6f610d07 | 483 | |
0cc7b392 DJ |
484 | if (msym) |
485 | { | |
6f610d07 | 486 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an |
24c274a1 | 487 | ELF-private part. */ |
6f610d07 | 488 | if (type != ST_SYNTHETIC) |
24c274a1 AM |
489 | { |
490 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
491 | elf_symbol_type *elf_sym = (elf_symbol_type *) sym; | |
492 | SET_MSYMBOL_SIZE (msym, elf_sym->internal_elf_sym.st_size); | |
493 | } | |
dea91a5c | 494 | |
a103a963 | 495 | msym->filename = filesymname; |
3e29f34a MR |
496 | if (elf_make_msymbol_special_p) |
497 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 498 | } |
2eaf8d2a | 499 | |
715c6909 TT |
500 | /* If we see a default versioned symbol, install it under |
501 | its version-less name. */ | |
502 | if (msym != NULL) | |
503 | { | |
504 | const char *atsign = strchr (sym->name, '@'); | |
505 | ||
506 | if (atsign != NULL && atsign[1] == '@' && atsign > sym->name) | |
507 | { | |
508 | int len = atsign - sym->name; | |
509 | ||
31edb802 CB |
510 | record_minimal_symbol (reader, |
511 | gdb::string_view (sym->name, len), | |
512 | true, symaddr, ms_type, sym->section, | |
513 | objfile); | |
715c6909 TT |
514 | } |
515 | } | |
516 | ||
2eaf8d2a DJ |
517 | /* For @plt symbols, also record a trampoline to the |
518 | destination symbol. The @plt symbol will be used in | |
519 | disassembly, and the trampoline will be used when we are | |
520 | trying to find the target. */ | |
521 | if (msym && ms_type == mst_text && type == ST_SYNTHETIC) | |
522 | { | |
523 | int len = strlen (sym->name); | |
524 | ||
525 | if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0) | |
526 | { | |
2eaf8d2a DJ |
527 | struct minimal_symbol *mtramp; |
528 | ||
31edb802 CB |
529 | mtramp = record_minimal_symbol |
530 | (reader, gdb::string_view (sym->name, len - 4), true, | |
531 | symaddr, mst_solib_trampoline, sym->section, objfile); | |
2eaf8d2a DJ |
532 | if (mtramp) |
533 | { | |
d9eaeb59 | 534 | SET_MSYMBOL_SIZE (mtramp, MSYMBOL_SIZE (msym)); |
422d65e7 | 535 | mtramp->created_by_gdb = 1; |
2eaf8d2a | 536 | mtramp->filename = filesymname; |
3e29f34a MR |
537 | if (elf_make_msymbol_special_p) |
538 | gdbarch_elf_make_msymbol_special (gdbarch, | |
539 | sym, mtramp); | |
2eaf8d2a DJ |
540 | } |
541 | } | |
542 | } | |
c906108c | 543 | } |
c906108c SS |
544 | } |
545 | } | |
546 | ||
07be84bf JK |
547 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
548 | for later look ups of which function to call when user requests | |
549 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
550 | library defining `function' we cannot yet know while reading OBJFILE which | |
551 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
552 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
553 | ||
554 | static void | |
8dddcb8f TT |
555 | elf_rel_plt_read (minimal_symbol_reader &reader, |
556 | struct objfile *objfile, asymbol **dyn_symbol_table) | |
07be84bf JK |
557 | { |
558 | bfd *obfd = objfile->obfd; | |
559 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); | |
02e169e2 | 560 | asection *relplt, *got_plt; |
07be84bf | 561 | bfd_size_type reloc_count, reloc; |
df6d5441 | 562 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
563 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
564 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
565 | ||
566 | if (objfile->separate_debug_objfile_backlink) | |
567 | return; | |
568 | ||
07be84bf JK |
569 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); |
570 | if (got_plt == NULL) | |
4b7d1f7f WN |
571 | { |
572 | /* For platforms where there is no separate .got.plt. */ | |
573 | got_plt = bfd_get_section_by_name (obfd, ".got"); | |
574 | if (got_plt == NULL) | |
575 | return; | |
576 | } | |
07be84bf | 577 | |
02e169e2 PA |
578 | /* Depending on system, we may find jump slots in a relocation |
579 | section for either .got.plt or .plt. */ | |
580 | asection *plt = bfd_get_section_by_name (obfd, ".plt"); | |
581 | int plt_elf_idx = (plt != NULL) ? elf_section_data (plt)->this_idx : -1; | |
582 | ||
583 | int got_plt_elf_idx = elf_section_data (got_plt)->this_idx; | |
584 | ||
07be84bf JK |
585 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ |
586 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
02e169e2 PA |
587 | { |
588 | const auto &this_hdr = elf_section_data (relplt)->this_hdr; | |
589 | ||
590 | if (this_hdr.sh_type == SHT_REL || this_hdr.sh_type == SHT_RELA) | |
591 | { | |
592 | if (this_hdr.sh_info == plt_elf_idx | |
593 | || this_hdr.sh_info == got_plt_elf_idx) | |
594 | break; | |
595 | } | |
596 | } | |
07be84bf JK |
597 | if (relplt == NULL) |
598 | return; | |
599 | ||
600 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
601 | return; | |
602 | ||
26fcd5d7 | 603 | std::string string_buffer; |
07be84bf | 604 | |
02e169e2 PA |
605 | /* Does ADDRESS reside in SECTION of OBFD? */ |
606 | auto within_section = [obfd] (asection *section, CORE_ADDR address) | |
607 | { | |
608 | if (section == NULL) | |
609 | return false; | |
610 | ||
fd361982 AM |
611 | return (bfd_section_vma (section) <= address |
612 | && (address < bfd_section_vma (section) | |
613 | + bfd_section_size (section))); | |
02e169e2 PA |
614 | }; |
615 | ||
07be84bf JK |
616 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; |
617 | for (reloc = 0; reloc < reloc_count; reloc++) | |
618 | { | |
22e048c9 | 619 | const char *name; |
07be84bf JK |
620 | struct minimal_symbol *msym; |
621 | CORE_ADDR address; | |
26fcd5d7 | 622 | const char *got_suffix = SYMBOL_GOT_PLT_SUFFIX; |
07be84bf | 623 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
07be84bf JK |
624 | |
625 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
07be84bf JK |
626 | address = relplt->relocation[reloc].address; |
627 | ||
02e169e2 PA |
628 | asection *msym_section; |
629 | ||
630 | /* Does the pointer reside in either the .got.plt or .plt | |
631 | sections? */ | |
632 | if (within_section (got_plt, address)) | |
633 | msym_section = got_plt; | |
634 | else if (within_section (plt, address)) | |
635 | msym_section = plt; | |
636 | else | |
07be84bf JK |
637 | continue; |
638 | ||
f50776aa PA |
639 | /* We cannot check if NAME is a reference to |
640 | mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the | |
641 | symbol is undefined and the objfile having NAME defined may | |
642 | not yet have been loaded. */ | |
07be84bf | 643 | |
26fcd5d7 TT |
644 | string_buffer.assign (name); |
645 | string_buffer.append (got_suffix, got_suffix + got_suffix_len); | |
07be84bf | 646 | |
31edb802 | 647 | msym = record_minimal_symbol (reader, string_buffer, |
02e169e2 PA |
648 | true, address, mst_slot_got_plt, |
649 | msym_section, objfile); | |
07be84bf | 650 | if (msym) |
d9eaeb59 | 651 | SET_MSYMBOL_SIZE (msym, ptr_size); |
07be84bf | 652 | } |
07be84bf JK |
653 | } |
654 | ||
655 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
656 | ||
8127a2fa TT |
657 | static const struct objfile_key<htab, htab_deleter> |
658 | elf_objfile_gnu_ifunc_cache_data; | |
07be84bf JK |
659 | |
660 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
661 | ||
662 | struct elf_gnu_ifunc_cache | |
663 | { | |
664 | /* This is always a function entry address, not a function descriptor. */ | |
665 | CORE_ADDR addr; | |
666 | ||
667 | char name[1]; | |
668 | }; | |
669 | ||
670 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
671 | ||
672 | static hashval_t | |
673 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
674 | { | |
9a3c8263 SM |
675 | const struct elf_gnu_ifunc_cache *a |
676 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
07be84bf JK |
677 | |
678 | return htab_hash_string (a->name); | |
679 | } | |
680 | ||
681 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
682 | ||
683 | static int | |
684 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
685 | { | |
9a3c8263 SM |
686 | const struct elf_gnu_ifunc_cache *a |
687 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
688 | const struct elf_gnu_ifunc_cache *b | |
689 | = (const struct elf_gnu_ifunc_cache *) b_voidp; | |
07be84bf JK |
690 | |
691 | return strcmp (a->name, b->name) == 0; | |
692 | } | |
693 | ||
694 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
695 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
696 | valid and therefore they were successfully recorded, return 0 otherwise. | |
697 | ||
698 | Function does not expect a duplicate entry. Use | |
699 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
700 | exists. */ | |
701 | ||
702 | static int | |
703 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
704 | { | |
7cbd4a93 | 705 | struct bound_minimal_symbol msym; |
07be84bf JK |
706 | struct objfile *objfile; |
707 | htab_t htab; | |
708 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
709 | void **slot; | |
710 | ||
711 | msym = lookup_minimal_symbol_by_pc (addr); | |
7cbd4a93 | 712 | if (msym.minsym == NULL) |
07be84bf | 713 | return 0; |
77e371c0 | 714 | if (BMSYMBOL_VALUE_ADDRESS (msym) != addr) |
07be84bf | 715 | return 0; |
e27d198c | 716 | objfile = msym.objfile; |
07be84bf JK |
717 | |
718 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
1adeb822 | 719 | resolution and it has no use for GDB. */ |
c9d95fa3 | 720 | const char *target_name = msym.minsym->linkage_name (); |
1adeb822 PA |
721 | size_t len = strlen (target_name); |
722 | ||
723 | /* Note we check the symbol's name instead of checking whether the | |
724 | symbol is in the .plt section because some systems have @plt | |
725 | symbols in the .text section. */ | |
726 | if (len > 4 && strcmp (target_name + len - 4, "@plt") == 0) | |
07be84bf JK |
727 | return 0; |
728 | ||
8127a2fa | 729 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); |
07be84bf JK |
730 | if (htab == NULL) |
731 | { | |
8127a2fa TT |
732 | htab = htab_create_alloc (1, elf_gnu_ifunc_cache_hash, |
733 | elf_gnu_ifunc_cache_eq, | |
734 | NULL, xcalloc, xfree); | |
735 | elf_objfile_gnu_ifunc_cache_data.set (objfile, htab); | |
07be84bf JK |
736 | } |
737 | ||
738 | entry_local.addr = addr; | |
739 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
740 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
741 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
224c3ddb SM |
742 | entry_p |
743 | = (struct elf_gnu_ifunc_cache *) obstack_finish (&objfile->objfile_obstack); | |
07be84bf JK |
744 | |
745 | slot = htab_find_slot (htab, entry_p, INSERT); | |
746 | if (*slot != NULL) | |
747 | { | |
9a3c8263 SM |
748 | struct elf_gnu_ifunc_cache *entry_found_p |
749 | = (struct elf_gnu_ifunc_cache *) *slot; | |
df6d5441 | 750 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
751 | |
752 | if (entry_found_p->addr != addr) | |
753 | { | |
754 | /* This case indicates buggy inferior program, the resolved address | |
755 | should never change. */ | |
756 | ||
757 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
758 | "function_address from %s to %s"), | |
759 | name, paddress (gdbarch, entry_found_p->addr), | |
760 | paddress (gdbarch, addr)); | |
761 | } | |
762 | ||
763 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
764 | } | |
765 | *slot = entry_p; | |
766 | ||
767 | return 1; | |
768 | } | |
769 | ||
770 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
771 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
772 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
773 | ||
774 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
775 | function. */ | |
776 | ||
777 | static int | |
778 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
779 | { | |
2030c079 | 780 | for (objfile *objfile : current_program_space->objfiles ()) |
07be84bf JK |
781 | { |
782 | htab_t htab; | |
783 | struct elf_gnu_ifunc_cache *entry_p; | |
784 | void **slot; | |
785 | ||
8127a2fa | 786 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); |
07be84bf JK |
787 | if (htab == NULL) |
788 | continue; | |
789 | ||
224c3ddb SM |
790 | entry_p = ((struct elf_gnu_ifunc_cache *) |
791 | alloca (sizeof (*entry_p) + strlen (name))); | |
07be84bf JK |
792 | strcpy (entry_p->name, name); |
793 | ||
794 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
795 | if (slot == NULL) | |
796 | continue; | |
9a3c8263 | 797 | entry_p = (struct elf_gnu_ifunc_cache *) *slot; |
07be84bf JK |
798 | gdb_assert (entry_p != NULL); |
799 | ||
800 | if (addr_p) | |
801 | *addr_p = entry_p->addr; | |
802 | return 1; | |
803 | } | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
808 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
809 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
810 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
811 | ||
812 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
813 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
814 | prevent cache entries duplicates. */ | |
815 | ||
816 | static int | |
817 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
818 | { | |
819 | char *name_got_plt; | |
07be84bf JK |
820 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
821 | ||
224c3ddb | 822 | name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1); |
07be84bf JK |
823 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); |
824 | ||
2030c079 | 825 | for (objfile *objfile : current_program_space->objfiles ()) |
07be84bf JK |
826 | { |
827 | bfd *obfd = objfile->obfd; | |
df6d5441 | 828 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
829 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
830 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
831 | CORE_ADDR pointer_address, addr; | |
832 | asection *plt; | |
224c3ddb | 833 | gdb_byte *buf = (gdb_byte *) alloca (ptr_size); |
3b7344d5 | 834 | struct bound_minimal_symbol msym; |
07be84bf JK |
835 | |
836 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
3b7344d5 | 837 | if (msym.minsym == NULL) |
07be84bf | 838 | continue; |
3b7344d5 | 839 | if (MSYMBOL_TYPE (msym.minsym) != mst_slot_got_plt) |
07be84bf | 840 | continue; |
77e371c0 | 841 | pointer_address = BMSYMBOL_VALUE_ADDRESS (msym); |
07be84bf JK |
842 | |
843 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
844 | if (plt == NULL) | |
845 | continue; | |
846 | ||
3b7344d5 | 847 | if (MSYMBOL_SIZE (msym.minsym) != ptr_size) |
07be84bf JK |
848 | continue; |
849 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
850 | continue; | |
851 | addr = extract_typed_address (buf, ptr_type); | |
8b88a78e PA |
852 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, |
853 | current_top_target ()); | |
4b7d1f7f | 854 | addr = gdbarch_addr_bits_remove (gdbarch, addr); |
07be84bf | 855 | |
07be84bf | 856 | if (elf_gnu_ifunc_record_cache (name, addr)) |
28f4fa4d PA |
857 | { |
858 | if (addr_p != NULL) | |
859 | *addr_p = addr; | |
860 | return 1; | |
861 | } | |
07be84bf JK |
862 | } |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
868 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
ececd218 | 869 | is not NULL) and the function returns true. It returns false otherwise. |
07be84bf JK |
870 | |
871 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
872 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
873 | ||
ececd218 | 874 | static bool |
07be84bf JK |
875 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) |
876 | { | |
877 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
ececd218 | 878 | return true; |
dea91a5c | 879 | |
07be84bf | 880 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
ececd218 | 881 | return true; |
07be84bf | 882 | |
ececd218 | 883 | return false; |
07be84bf JK |
884 | } |
885 | ||
886 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
887 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
888 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
889 | */ | |
890 | ||
891 | static CORE_ADDR | |
892 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
893 | { | |
2c02bd72 | 894 | const char *name_at_pc; |
07be84bf JK |
895 | CORE_ADDR start_at_pc, address; |
896 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
897 | struct value *function, *address_val; | |
e1b2624a AA |
898 | CORE_ADDR hwcap = 0; |
899 | struct value *hwcap_val; | |
07be84bf JK |
900 | |
901 | /* Try first any non-intrusive methods without an inferior call. */ | |
902 | ||
903 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
904 | && start_at_pc == pc) | |
905 | { | |
906 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
907 | return address; | |
908 | } | |
909 | else | |
910 | name_at_pc = NULL; | |
911 | ||
912 | function = allocate_value (func_func_type); | |
1a088441 | 913 | VALUE_LVAL (function) = lval_memory; |
07be84bf JK |
914 | set_value_address (function, pc); |
915 | ||
e1b2624a AA |
916 | /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as |
917 | parameter. FUNCTION is the function entry address. ADDRESS may be a | |
918 | function descriptor. */ | |
07be84bf | 919 | |
8b88a78e | 920 | target_auxv_search (current_top_target (), AT_HWCAP, &hwcap); |
e1b2624a AA |
921 | hwcap_val = value_from_longest (builtin_type (gdbarch) |
922 | ->builtin_unsigned_long, hwcap); | |
e71585ff | 923 | address_val = call_function_by_hand (function, NULL, hwcap_val); |
07be84bf | 924 | address = value_as_address (address_val); |
8b88a78e | 925 | address = gdbarch_convert_from_func_ptr_addr (gdbarch, address, current_top_target ()); |
4b7d1f7f | 926 | address = gdbarch_addr_bits_remove (gdbarch, address); |
07be84bf JK |
927 | |
928 | if (name_at_pc) | |
929 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
930 | ||
931 | return address; | |
932 | } | |
933 | ||
0e30163f JK |
934 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
935 | ||
936 | static void | |
937 | elf_gnu_ifunc_resolver_stop (struct breakpoint *b) | |
938 | { | |
939 | struct breakpoint *b_return; | |
940 | struct frame_info *prev_frame = get_prev_frame (get_current_frame ()); | |
941 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); | |
942 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
00431a78 | 943 | int thread_id = inferior_thread ()->global_num; |
0e30163f JK |
944 | |
945 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
946 | ||
947 | for (b_return = b->related_breakpoint; b_return != b; | |
948 | b_return = b_return->related_breakpoint) | |
949 | { | |
950 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
951 | gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL); | |
952 | gdb_assert (frame_id_p (b_return->frame_id)); | |
953 | ||
954 | if (b_return->thread == thread_id | |
955 | && b_return->loc->requested_address == prev_pc | |
956 | && frame_id_eq (b_return->frame_id, prev_frame_id)) | |
957 | break; | |
958 | } | |
959 | ||
960 | if (b_return == b) | |
961 | { | |
0e30163f JK |
962 | /* No need to call find_pc_line for symbols resolving as this is only |
963 | a helper breakpointer never shown to the user. */ | |
964 | ||
51abb421 | 965 | symtab_and_line sal; |
0e30163f JK |
966 | sal.pspace = current_inferior ()->pspace; |
967 | sal.pc = prev_pc; | |
968 | sal.section = find_pc_overlay (sal.pc); | |
969 | sal.explicit_pc = 1; | |
454dafbd TT |
970 | b_return |
971 | = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
972 | prev_frame_id, | |
973 | bp_gnu_ifunc_resolver_return).release (); | |
0e30163f | 974 | |
c70a6932 JK |
975 | /* set_momentary_breakpoint invalidates PREV_FRAME. */ |
976 | prev_frame = NULL; | |
977 | ||
0e30163f JK |
978 | /* Add new b_return to the ring list b->related_breakpoint. */ |
979 | gdb_assert (b_return->related_breakpoint == b_return); | |
980 | b_return->related_breakpoint = b->related_breakpoint; | |
981 | b->related_breakpoint = b_return; | |
982 | } | |
983 | } | |
984 | ||
985 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
986 | ||
987 | static void | |
988 | elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b) | |
989 | { | |
00431a78 | 990 | thread_info *thread = inferior_thread (); |
0e30163f JK |
991 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
992 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
993 | struct type *value_type = TYPE_TARGET_TYPE (func_func_type); | |
00431a78 | 994 | struct regcache *regcache = get_thread_regcache (thread); |
6a3a010b | 995 | struct value *func_func; |
0e30163f JK |
996 | struct value *value; |
997 | CORE_ADDR resolved_address, resolved_pc; | |
0e30163f JK |
998 | |
999 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
1000 | ||
0e30163f JK |
1001 | while (b->related_breakpoint != b) |
1002 | { | |
1003 | struct breakpoint *b_next = b->related_breakpoint; | |
1004 | ||
1005 | switch (b->type) | |
1006 | { | |
1007 | case bp_gnu_ifunc_resolver: | |
1008 | break; | |
1009 | case bp_gnu_ifunc_resolver_return: | |
1010 | delete_breakpoint (b); | |
1011 | break; | |
1012 | default: | |
1013 | internal_error (__FILE__, __LINE__, | |
1014 | _("handle_inferior_event: Invalid " | |
1015 | "gnu-indirect-function breakpoint type %d"), | |
1016 | (int) b->type); | |
1017 | } | |
1018 | b = b_next; | |
1019 | } | |
1020 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
6a3a010b MR |
1021 | gdb_assert (b->loc->next == NULL); |
1022 | ||
1023 | func_func = allocate_value (func_func_type); | |
1a088441 | 1024 | VALUE_LVAL (func_func) = lval_memory; |
6a3a010b MR |
1025 | set_value_address (func_func, b->loc->related_address); |
1026 | ||
1027 | value = allocate_value (value_type); | |
1028 | gdbarch_return_value (gdbarch, func_func, value_type, regcache, | |
1029 | value_contents_raw (value), NULL); | |
1030 | resolved_address = value_as_address (value); | |
1031 | resolved_pc = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
1032 | resolved_address, | |
8b88a78e | 1033 | current_top_target ()); |
4b7d1f7f | 1034 | resolved_pc = gdbarch_addr_bits_remove (gdbarch, resolved_pc); |
0e30163f | 1035 | |
f8eba3c6 | 1036 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
d28cd78a | 1037 | elf_gnu_ifunc_record_cache (event_location_to_string (b->location.get ()), |
f00aae0f | 1038 | resolved_pc); |
0e30163f | 1039 | |
0e30163f | 1040 | b->type = bp_breakpoint; |
6c5b2ebe | 1041 | update_breakpoint_locations (b, current_program_space, |
79188d8d PA |
1042 | find_function_start_sal (resolved_pc, NULL, true), |
1043 | {}); | |
0e30163f JK |
1044 | } |
1045 | ||
2750ef27 TT |
1046 | /* A helper function for elf_symfile_read that reads the minimal |
1047 | symbols. */ | |
c906108c SS |
1048 | |
1049 | static void | |
5f6cac40 TT |
1050 | elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags, |
1051 | const struct elfinfo *ei) | |
c906108c | 1052 | { |
63524580 | 1053 | bfd *synth_abfd, *abfd = objfile->obfd; |
62553543 EZ |
1054 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1055 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1056 | asymbol *synthsyms; | |
c906108c | 1057 | |
45cfd468 DE |
1058 | if (symtab_create_debug) |
1059 | { | |
1060 | fprintf_unfiltered (gdb_stdlog, | |
1061 | "Reading minimal symbols of objfile %s ...\n", | |
4262abfb | 1062 | objfile_name (objfile)); |
45cfd468 DE |
1063 | } |
1064 | ||
5f6cac40 TT |
1065 | /* If we already have minsyms, then we can skip some work here. |
1066 | However, if there were stabs or mdebug sections, we go ahead and | |
1067 | redo all the work anyway, because the psym readers for those | |
1068 | kinds of debuginfo need extra information found here. This can | |
1069 | go away once all types of symbols are in the per-BFD object. */ | |
1070 | if (objfile->per_bfd->minsyms_read | |
1071 | && ei->stabsect == NULL | |
30d1f018 WP |
1072 | && ei->mdebugsect == NULL |
1073 | && ei->ctfsect == NULL) | |
5f6cac40 TT |
1074 | { |
1075 | if (symtab_create_debug) | |
1076 | fprintf_unfiltered (gdb_stdlog, | |
1077 | "... minimal symbols previously read\n"); | |
1078 | return; | |
1079 | } | |
1080 | ||
d25e8719 | 1081 | minimal_symbol_reader reader (objfile); |
c906108c | 1082 | |
18a94d75 | 1083 | /* Process the normal ELF symbol table first. */ |
c906108c | 1084 | |
62553543 EZ |
1085 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
1086 | if (storage_needed < 0) | |
3e43a32a MS |
1087 | error (_("Can't read symbols from %s: %s"), |
1088 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1089 | bfd_errmsg (bfd_get_error ())); |
1090 | ||
1091 | if (storage_needed > 0) | |
1092 | { | |
80c57053 JK |
1093 | /* Memory gets permanently referenced from ABFD after |
1094 | bfd_canonicalize_symtab so it must not get freed before ABFD gets. */ | |
1095 | ||
224c3ddb | 1096 | symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
62553543 EZ |
1097 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
1098 | ||
1099 | if (symcount < 0) | |
3e43a32a MS |
1100 | error (_("Can't read symbols from %s: %s"), |
1101 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1102 | bfd_errmsg (bfd_get_error ())); |
1103 | ||
ce6c454e TT |
1104 | elf_symtab_read (reader, objfile, ST_REGULAR, symcount, symbol_table, |
1105 | false); | |
62553543 | 1106 | } |
c906108c SS |
1107 | |
1108 | /* Add the dynamic symbols. */ | |
1109 | ||
62553543 EZ |
1110 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
1111 | ||
1112 | if (storage_needed > 0) | |
1113 | { | |
3f1eff0a JK |
1114 | /* Memory gets permanently referenced from ABFD after |
1115 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1116 | It happens only in the case when elf_slurp_reloc_table sees | |
1117 | asection->relocation NULL. Determining which section is asection is | |
1118 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1119 | implementation detail, though. */ | |
1120 | ||
224c3ddb | 1121 | dyn_symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
62553543 EZ |
1122 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
1123 | dyn_symbol_table); | |
1124 | ||
1125 | if (dynsymcount < 0) | |
3e43a32a MS |
1126 | error (_("Can't read symbols from %s: %s"), |
1127 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1128 | bfd_errmsg (bfd_get_error ())); |
1129 | ||
8dddcb8f | 1130 | elf_symtab_read (reader, objfile, ST_DYNAMIC, dynsymcount, |
ce6c454e | 1131 | dyn_symbol_table, false); |
07be84bf | 1132 | |
8dddcb8f | 1133 | elf_rel_plt_read (reader, objfile, dyn_symbol_table); |
62553543 EZ |
1134 | } |
1135 | ||
63524580 JK |
1136 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1137 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1138 | ||
1139 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1140 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1141 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1142 | read the code address from .opd while it reads the .symtab section from | |
1143 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1144 | ||
1145 | With SYNTH_ABFD the .opd section will be read from the original | |
1146 | backlinked binary where it is valid. */ | |
1147 | ||
1148 | if (objfile->separate_debug_objfile_backlink) | |
1149 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd; | |
1150 | else | |
1151 | synth_abfd = abfd; | |
1152 | ||
62553543 EZ |
1153 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1154 | ||
63524580 | 1155 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1156 | dynsymcount, dyn_symbol_table, |
1157 | &synthsyms); | |
1158 | if (synthcount > 0) | |
1159 | { | |
62553543 EZ |
1160 | long i; |
1161 | ||
b22e99fd | 1162 | std::unique_ptr<asymbol *[]> |
d1e4a624 | 1163 | synth_symbol_table (new asymbol *[synthcount]); |
62553543 | 1164 | for (i = 0; i < synthcount; i++) |
9f20e3da | 1165 | synth_symbol_table[i] = synthsyms + i; |
8dddcb8f | 1166 | elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount, |
ce6c454e | 1167 | synth_symbol_table.get (), true); |
ba713918 AL |
1168 | |
1169 | xfree (synthsyms); | |
1170 | synthsyms = NULL; | |
62553543 | 1171 | } |
c906108c | 1172 | |
7134143f DJ |
1173 | /* Install any minimal symbols that have been collected as the current |
1174 | minimal symbols for this objfile. The debug readers below this point | |
1175 | should not generate new minimal symbols; if they do it's their | |
1176 | responsibility to install them. "mdebug" appears to be the only one | |
1177 | which will do this. */ | |
1178 | ||
d25e8719 | 1179 | reader.install (); |
7134143f | 1180 | |
4f00dda3 DE |
1181 | if (symtab_create_debug) |
1182 | fprintf_unfiltered (gdb_stdlog, "Done reading minimal symbols.\n"); | |
2750ef27 TT |
1183 | } |
1184 | ||
1185 | /* Scan and build partial symbols for a symbol file. | |
1186 | We have been initialized by a call to elf_symfile_init, which | |
1187 | currently does nothing. | |
1188 | ||
2750ef27 TT |
1189 | This function only does the minimum work necessary for letting the |
1190 | user "name" things symbolically; it does not read the entire symtab. | |
1191 | Instead, it reads the external and static symbols and puts them in partial | |
1192 | symbol tables. When more extensive information is requested of a | |
1193 | file, the corresponding partial symbol table is mutated into a full | |
1194 | fledged symbol table by going back and reading the symbols | |
1195 | for real. | |
1196 | ||
1197 | We look for sections with specific names, to tell us what debug | |
1198 | format to look for: FIXME!!! | |
1199 | ||
1200 | elfstab_build_psymtabs() handles STABS symbols; | |
1201 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1202 | ||
1203 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1204 | like a COFF symbol table, but has only the minimal information necessary | |
1205 | for linking. We process this also, and use the information to | |
1206 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1207 | capability even for files compiled without -g. */ | |
1208 | ||
1209 | static void | |
b15cc25c | 1210 | elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
2750ef27 TT |
1211 | { |
1212 | bfd *abfd = objfile->obfd; | |
1213 | struct elfinfo ei; | |
30d1f018 | 1214 | bool has_dwarf2 = true; |
2750ef27 | 1215 | |
2750ef27 | 1216 | memset ((char *) &ei, 0, sizeof (ei)); |
97cbe998 SDJ |
1217 | if (!(objfile->flags & OBJF_READNEVER)) |
1218 | bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); | |
c906108c | 1219 | |
5f6cac40 TT |
1220 | elf_read_minimal_symbols (objfile, symfile_flags, &ei); |
1221 | ||
c906108c SS |
1222 | /* ELF debugging information is inserted into the psymtab in the |
1223 | order of least informative first - most informative last. Since | |
1224 | the psymtab table is searched `most recent insertion first' this | |
1225 | increases the probability that more detailed debug information | |
1226 | for a section is found. | |
1227 | ||
1228 | For instance, an object file might contain both .mdebug (XCOFF) | |
1229 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1230 | (searched last) and DWARF2 is inserted last (searched first). If | |
1231 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1232 | an included file XCOFF info is useless. */ |
c906108c SS |
1233 | |
1234 | if (ei.mdebugsect) | |
1235 | { | |
1236 | const struct ecoff_debug_swap *swap; | |
1237 | ||
1238 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 1239 | information. */ |
c906108c SS |
1240 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1241 | if (swap) | |
d4f3574e | 1242 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1243 | } |
1244 | if (ei.stabsect) | |
1245 | { | |
1246 | asection *str_sect; | |
1247 | ||
1248 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 1249 | a separate section. */ |
c906108c SS |
1250 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1251 | ||
1252 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1253 | if (str_sect) | |
1254 | elfstab_build_psymtabs (objfile, | |
086df311 | 1255 | ei.stabsect, |
c906108c | 1256 | str_sect->filepos, |
fd361982 | 1257 | bfd_section_size (str_sect)); |
c906108c | 1258 | } |
9291a0cd | 1259 | |
4b610737 | 1260 | if (dwarf2_has_info (objfile, NULL, true)) |
b11896a5 | 1261 | { |
3c0aa29a | 1262 | dw_index_kind index_kind; |
3e03848b | 1263 | |
3c0aa29a PA |
1264 | /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF |
1265 | debug information present in OBJFILE. If there is such debug | |
1266 | info present never use an index. */ | |
1267 | if (!objfile_has_partial_symbols (objfile) | |
1268 | && dwarf2_initialize_objfile (objfile, &index_kind)) | |
1269 | { | |
1270 | switch (index_kind) | |
1271 | { | |
1272 | case dw_index_kind::GDB_INDEX: | |
1273 | objfile_set_sym_fns (objfile, &elf_sym_fns_gdb_index); | |
1274 | break; | |
1275 | case dw_index_kind::DEBUG_NAMES: | |
1276 | objfile_set_sym_fns (objfile, &elf_sym_fns_debug_names); | |
1277 | break; | |
1278 | } | |
1279 | } | |
1280 | else | |
b11896a5 TT |
1281 | { |
1282 | /* It is ok to do this even if the stabs reader made some | |
1283 | partial symbols, because OBJF_PSYMTABS_READ has not been | |
1284 | set, and so our lazy reader function will still be called | |
1285 | when needed. */ | |
8fb8eb5c | 1286 | objfile_set_sym_fns (objfile, &elf_sym_fns_lazy_psyms); |
b11896a5 TT |
1287 | } |
1288 | } | |
3e43a32a MS |
1289 | /* If the file has its own symbol tables it has no separate debug |
1290 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1291 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
8a92335b JK |
1292 | `.note.gnu.build-id'. |
1293 | ||
1294 | .gnu_debugdata is !objfile_has_partial_symbols because it contains only | |
1295 | .symtab, not .debug_* section. But if we already added .gnu_debugdata as | |
1296 | an objfile via find_separate_debug_file_in_section there was no separate | |
1297 | debug info available. Therefore do not attempt to search for another one, | |
1298 | objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to | |
1299 | be NULL and we would possibly violate it. */ | |
1300 | ||
1301 | else if (!objfile_has_partial_symbols (objfile) | |
1302 | && objfile->separate_debug_objfile == NULL | |
1303 | && objfile->separate_debug_objfile_backlink == NULL) | |
9cce227f | 1304 | { |
a8dbfd58 | 1305 | std::string debugfile = find_separate_debug_file_by_buildid (objfile); |
9cce227f | 1306 | |
a8dbfd58 SM |
1307 | if (debugfile.empty ()) |
1308 | debugfile = find_separate_debug_file_by_debuglink (objfile); | |
9cce227f | 1309 | |
a8dbfd58 | 1310 | if (!debugfile.empty ()) |
9cce227f | 1311 | { |
b926417a | 1312 | gdb_bfd_ref_ptr debug_bfd (symfile_bfd_open (debugfile.c_str ())); |
d7f9d729 | 1313 | |
b926417a | 1314 | symbol_file_add_separate (debug_bfd.get (), debugfile.c_str (), |
192b62ce | 1315 | symfile_flags, objfile); |
9cce227f | 1316 | } |
0d79cdc4 AM |
1317 | else |
1318 | { | |
30d1f018 | 1319 | has_dwarf2 = false; |
0d79cdc4 AM |
1320 | const struct bfd_build_id *build_id = build_id_bfd_get (objfile->obfd); |
1321 | ||
1322 | if (build_id != nullptr) | |
1323 | { | |
1324 | gdb::unique_xmalloc_ptr<char> symfile_path; | |
1325 | scoped_fd fd (debuginfod_debuginfo_query (build_id->data, | |
1326 | build_id->size, | |
1327 | objfile->original_name, | |
1328 | &symfile_path)); | |
1329 | ||
1330 | if (fd.get () >= 0) | |
1331 | { | |
1332 | /* File successfully retrieved from server. */ | |
1333 | gdb_bfd_ref_ptr debug_bfd (symfile_bfd_open (symfile_path.get ())); | |
1334 | ||
1335 | if (debug_bfd == nullptr) | |
1336 | warning (_("File \"%s\" from debuginfod cannot be opened as bfd"), | |
1337 | objfile->original_name); | |
1338 | else if (build_id_verify (debug_bfd.get (), build_id->size, build_id->data)) | |
1339 | { | |
1340 | symbol_file_add_separate (debug_bfd.get (), symfile_path.get (), | |
1341 | symfile_flags, objfile); | |
1342 | has_dwarf2 = true; | |
1343 | } | |
1344 | } | |
1345 | } | |
1346 | } | |
30d1f018 WP |
1347 | } |
1348 | ||
1349 | /* Read the CTF section only if there is no DWARF info. */ | |
1350 | if (!has_dwarf2 && ei.ctfsect) | |
1351 | { | |
1352 | elfctf_build_psymtabs (objfile); | |
9cce227f | 1353 | } |
c906108c SS |
1354 | } |
1355 | ||
b11896a5 TT |
1356 | /* Callback to lazily read psymtabs. */ |
1357 | ||
1358 | static void | |
1359 | read_psyms (struct objfile *objfile) | |
1360 | { | |
251d32d9 | 1361 | if (dwarf2_has_info (objfile, NULL)) |
b11896a5 TT |
1362 | dwarf2_build_psymtabs (objfile); |
1363 | } | |
1364 | ||
c906108c SS |
1365 | /* Initialize anything that needs initializing when a completely new symbol |
1366 | file is specified (not just adding some symbols from another file, e.g. a | |
caa429d8 | 1367 | shared library). */ |
c906108c SS |
1368 | |
1369 | static void | |
fba45db2 | 1370 | elf_new_init (struct objfile *ignore) |
c906108c | 1371 | { |
c906108c SS |
1372 | } |
1373 | ||
1374 | /* Perform any local cleanups required when we are done with a particular | |
1375 | objfile. I.E, we are in the process of discarding all symbol information | |
1376 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1377 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1378 | |
1379 | static void | |
fba45db2 | 1380 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1381 | { |
c906108c SS |
1382 | } |
1383 | ||
db7a9bcd | 1384 | /* ELF specific initialization routine for reading symbols. */ |
c906108c SS |
1385 | |
1386 | static void | |
fba45db2 | 1387 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
1388 | { |
1389 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
1390 | find this causes a significant slowdown in gdb then we could | |
1391 | set it in the debug symbol readers only when necessary. */ | |
1392 | objfile->flags |= OBJF_REORDERED; | |
1393 | } | |
1394 | ||
55aa24fb SDJ |
1395 | /* Implementation of `sym_get_probes', as documented in symfile.h. */ |
1396 | ||
814cf43a | 1397 | static const elfread_data & |
55aa24fb SDJ |
1398 | elf_get_probes (struct objfile *objfile) |
1399 | { | |
814cf43a | 1400 | elfread_data *probes_per_bfd = probe_key.get (objfile->obfd); |
55aa24fb | 1401 | |
aaa63a31 | 1402 | if (probes_per_bfd == NULL) |
55aa24fb | 1403 | { |
814cf43a | 1404 | probes_per_bfd = probe_key.emplace (objfile->obfd); |
55aa24fb SDJ |
1405 | |
1406 | /* Here we try to gather information about all types of probes from the | |
1407 | objfile. */ | |
935676c9 | 1408 | for (const static_probe_ops *ops : all_static_probe_ops) |
0782db84 | 1409 | ops->get_probes (probes_per_bfd, objfile); |
55aa24fb SDJ |
1410 | } |
1411 | ||
aaa63a31 | 1412 | return *probes_per_bfd; |
55aa24fb SDJ |
1413 | } |
1414 | ||
c906108c | 1415 | \f |
55aa24fb SDJ |
1416 | |
1417 | /* Implementation `sym_probe_fns', as documented in symfile.h. */ | |
1418 | ||
1419 | static const struct sym_probe_fns elf_probe_fns = | |
1420 | { | |
25f9533e | 1421 | elf_get_probes, /* sym_get_probes */ |
55aa24fb SDJ |
1422 | }; |
1423 | ||
c906108c SS |
1424 | /* Register that we are able to handle ELF object file formats. */ |
1425 | ||
00b5771c | 1426 | static const struct sym_fns elf_sym_fns = |
c906108c | 1427 | { |
3e43a32a MS |
1428 | elf_new_init, /* init anything gbl to entire symtab */ |
1429 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1430 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 TT |
1431 | NULL, /* sym_read_psymbols */ |
1432 | elf_symfile_finish, /* finished with file, cleanup */ | |
1433 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1434 | elf_symfile_segments, /* Get segment information from a file. */ | |
1435 | NULL, | |
1436 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1437 | &elf_probe_fns, /* sym_probe_fns */ |
b11896a5 TT |
1438 | &psym_functions |
1439 | }; | |
1440 | ||
1441 | /* The same as elf_sym_fns, but not registered and lazily reads | |
1442 | psymbols. */ | |
1443 | ||
e36122e9 | 1444 | const struct sym_fns elf_sym_fns_lazy_psyms = |
b11896a5 | 1445 | { |
b11896a5 TT |
1446 | elf_new_init, /* init anything gbl to entire symtab */ |
1447 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1448 | elf_symfile_read, /* read a symbol file into symtab */ | |
1449 | read_psyms, /* sym_read_psymbols */ | |
3e43a32a MS |
1450 | elf_symfile_finish, /* finished with file, cleanup */ |
1451 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1452 | elf_symfile_segments, /* Get segment information from a file. */ | |
1453 | NULL, | |
1454 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1455 | &elf_probe_fns, /* sym_probe_fns */ |
00b5771c | 1456 | &psym_functions |
c906108c SS |
1457 | }; |
1458 | ||
9291a0cd TT |
1459 | /* The same as elf_sym_fns, but not registered and uses the |
1460 | DWARF-specific GNU index rather than psymtab. */ | |
e36122e9 | 1461 | const struct sym_fns elf_sym_fns_gdb_index = |
9291a0cd | 1462 | { |
3e43a32a MS |
1463 | elf_new_init, /* init anything gbl to entire symab */ |
1464 | elf_symfile_init, /* read initial info, setup for sym_red() */ | |
1465 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 | 1466 | NULL, /* sym_read_psymbols */ |
3e43a32a | 1467 | elf_symfile_finish, /* finished with file, cleanup */ |
405feb71 | 1468 | default_symfile_offsets, /* Translate ext. to int. relocation */ |
3e43a32a MS |
1469 | elf_symfile_segments, /* Get segment information from a file. */ |
1470 | NULL, | |
1471 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1472 | &elf_probe_fns, /* sym_probe_fns */ |
00b5771c | 1473 | &dwarf2_gdb_index_functions |
9291a0cd TT |
1474 | }; |
1475 | ||
927aa2e7 JK |
1476 | /* The same as elf_sym_fns, but not registered and uses the |
1477 | DWARF-specific .debug_names index rather than psymtab. */ | |
1478 | const struct sym_fns elf_sym_fns_debug_names = | |
1479 | { | |
1480 | elf_new_init, /* init anything gbl to entire symab */ | |
1481 | elf_symfile_init, /* read initial info, setup for sym_red() */ | |
1482 | elf_symfile_read, /* read a symbol file into symtab */ | |
1483 | NULL, /* sym_read_psymbols */ | |
1484 | elf_symfile_finish, /* finished with file, cleanup */ | |
405feb71 | 1485 | default_symfile_offsets, /* Translate ext. to int. relocation */ |
927aa2e7 JK |
1486 | elf_symfile_segments, /* Get segment information from a file. */ |
1487 | NULL, | |
1488 | default_symfile_relocate, /* Relocate a debug section. */ | |
1489 | &elf_probe_fns, /* sym_probe_fns */ | |
1490 | &dwarf2_debug_names_functions | |
1491 | }; | |
1492 | ||
07be84bf JK |
1493 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1494 | ||
1495 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1496 | { | |
1497 | elf_gnu_ifunc_resolve_addr, | |
1498 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1499 | elf_gnu_ifunc_resolver_stop, |
1500 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1501 | }; |
1502 | ||
6c265988 | 1503 | void _initialize_elfread (); |
c906108c | 1504 | void |
6c265988 | 1505 | _initialize_elfread () |
c906108c | 1506 | { |
c256e171 | 1507 | add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns); |
07be84bf | 1508 | |
07be84bf | 1509 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; |
c906108c | 1510 | } |