Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
3666a048 | 3 | Copyright (C) 1991-2021 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" | |
70182375 | 54 | #include "dwarf2/public.h" |
c906108c | 55 | |
eb00e468 TT |
56 | /* A subclass of psymbol_functions that arranges to read the DWARF |
57 | partial symbols when needed. */ | |
58 | struct lazy_dwarf_reader : public psymbol_functions | |
59 | { | |
60 | using psymbol_functions::psymbol_functions; | |
61 | ||
62 | bool can_lazily_read_symbols () override | |
63 | { | |
64 | return true; | |
65 | } | |
66 | ||
67 | void read_partial_symbols (struct objfile *objfile) override | |
68 | { | |
69 | if (dwarf2_has_info (objfile, nullptr)) | |
eb36a3eb | 70 | dwarf2_build_psymtabs (objfile, this); |
eb00e468 TT |
71 | } |
72 | }; | |
73 | ||
c906108c | 74 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 75 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
76 | It's local to elf_symfile_read. */ |
77 | ||
c5aa993b JM |
78 | struct elfinfo |
79 | { | |
c5aa993b | 80 | asection *stabsect; /* Section pointer for .stab section */ |
c5aa993b | 81 | asection *mdebugsect; /* Section pointer for .mdebug section */ |
30d1f018 | 82 | asection *ctfsect; /* Section pointer for .ctf section */ |
c5aa993b | 83 | }; |
c906108c | 84 | |
814cf43a TT |
85 | /* Type for per-BFD data. */ |
86 | ||
87 | typedef std::vector<std::unique_ptr<probe>> elfread_data; | |
88 | ||
5d9cf8a4 | 89 | /* Per-BFD data for probe info. */ |
55aa24fb | 90 | |
814cf43a | 91 | static const struct bfd_key<elfread_data> probe_key; |
55aa24fb | 92 | |
07be84bf JK |
93 | /* Minimal symbols located at the GOT entries for .plt - that is the real |
94 | pointer where the given entry will jump to. It gets updated by the real | |
95 | function address during lazy ld.so resolving in the inferior. These | |
96 | minimal symbols are indexed for <tab>-completion. */ | |
97 | ||
98 | #define SYMBOL_GOT_PLT_SUFFIX "@got.plt" | |
99 | ||
31d99776 DJ |
100 | /* Locate the segments in ABFD. */ |
101 | ||
62982abd | 102 | static symfile_segment_data_up |
31d99776 DJ |
103 | elf_symfile_segments (bfd *abfd) |
104 | { | |
105 | Elf_Internal_Phdr *phdrs, **segments; | |
106 | long phdrs_size; | |
107 | int num_phdrs, num_segments, num_sections, i; | |
108 | asection *sect; | |
31d99776 DJ |
109 | |
110 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
111 | if (phdrs_size == -1) | |
112 | return NULL; | |
113 | ||
224c3ddb | 114 | phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size); |
31d99776 DJ |
115 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); |
116 | if (num_phdrs == -1) | |
117 | return NULL; | |
118 | ||
119 | num_segments = 0; | |
8d749320 | 120 | segments = XALLOCAVEC (Elf_Internal_Phdr *, num_phdrs); |
31d99776 DJ |
121 | for (i = 0; i < num_phdrs; i++) |
122 | if (phdrs[i].p_type == PT_LOAD) | |
123 | segments[num_segments++] = &phdrs[i]; | |
124 | ||
125 | if (num_segments == 0) | |
126 | return NULL; | |
127 | ||
62982abd | 128 | symfile_segment_data_up data (new symfile_segment_data); |
68b888ff | 129 | data->segments.reserve (num_segments); |
31d99776 DJ |
130 | |
131 | for (i = 0; i < num_segments; i++) | |
68b888ff | 132 | data->segments.emplace_back (segments[i]->p_vaddr, segments[i]->p_memsz); |
31d99776 DJ |
133 | |
134 | num_sections = bfd_count_sections (abfd); | |
9005fbbb SM |
135 | |
136 | /* All elements are initialized to 0 (map to no segment). */ | |
137 | data->segment_info.resize (num_sections); | |
31d99776 DJ |
138 | |
139 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
140 | { | |
141 | int j; | |
31d99776 | 142 | |
fd361982 | 143 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
31d99776 DJ |
144 | continue; |
145 | ||
62b74cb8 | 146 | Elf_Internal_Shdr *this_hdr = &elf_section_data (sect)->this_hdr; |
31d99776 DJ |
147 | |
148 | for (j = 0; j < num_segments; j++) | |
62b74cb8 | 149 | if (ELF_SECTION_IN_SEGMENT (this_hdr, segments[j])) |
31d99776 DJ |
150 | { |
151 | data->segment_info[i] = j + 1; | |
152 | break; | |
153 | } | |
154 | ||
ad09a548 DJ |
155 | /* We should have found a segment for every non-empty section. |
156 | If we haven't, we will not relocate this section by any | |
157 | offsets we apply to the segments. As an exception, do not | |
158 | warn about SHT_NOBITS sections; in normal ELF execution | |
159 | environments, SHT_NOBITS means zero-initialized and belongs | |
160 | in a segment, but in no-OS environments some tools (e.g. ARM | |
161 | RealView) use SHT_NOBITS for uninitialized data. Since it is | |
162 | uninitialized, it doesn't need a program header. Such | |
163 | binaries are not relocatable. */ | |
25f4c262 KS |
164 | |
165 | /* Exclude debuginfo files from this warning, too, since those | |
166 | are often not strictly compliant with the standard. See, e.g., | |
167 | ld/24717 for more discussion. */ | |
168 | if (!is_debuginfo_file (abfd) | |
169 | && bfd_section_size (sect) > 0 && j == num_segments | |
fd361982 | 170 | && (bfd_section_flags (sect) & SEC_LOAD) != 0) |
9d3ab915 KS |
171 | warning (_("Loadable section \"%s\" outside of ELF segments\n in %s"), |
172 | bfd_section_name (sect), bfd_get_filename (abfd)); | |
31d99776 DJ |
173 | } |
174 | ||
175 | return data; | |
176 | } | |
177 | ||
c906108c SS |
178 | /* We are called once per section from elf_symfile_read. We |
179 | need to examine each section we are passed, check to see | |
180 | if it is something we are interested in processing, and | |
181 | if so, stash away some access information for the section. | |
182 | ||
183 | For now we recognize the dwarf debug information sections and | |
184 | line number sections from matching their section names. The | |
185 | ELF definition is no real help here since it has no direct | |
186 | knowledge of DWARF (by design, so any debugging format can be | |
187 | used). | |
188 | ||
189 | We also recognize the ".stab" sections used by the Sun compilers | |
190 | released with Solaris 2. | |
191 | ||
192 | FIXME: The section names should not be hardwired strings (what | |
193 | should they be? I don't think most object file formats have enough | |
0963b4bd | 194 | section flags to specify what kind of debug section it is. |
c906108c SS |
195 | -kingdon). */ |
196 | ||
197 | static void | |
08f93a1a | 198 | elf_locate_sections (asection *sectp, struct elfinfo *ei) |
c906108c | 199 | { |
7ce59000 | 200 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 201 | { |
c5aa993b | 202 | ei->stabsect = sectp; |
c906108c | 203 | } |
6314a349 | 204 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 205 | { |
c5aa993b | 206 | ei->mdebugsect = sectp; |
c906108c | 207 | } |
30d1f018 WP |
208 | else if (strcmp (sectp->name, ".ctf") == 0) |
209 | { | |
210 | ei->ctfsect = sectp; | |
211 | } | |
c906108c SS |
212 | } |
213 | ||
c906108c | 214 | static struct minimal_symbol * |
8dddcb8f | 215 | record_minimal_symbol (minimal_symbol_reader &reader, |
31edb802 | 216 | gdb::string_view name, bool copy_name, |
04a679b8 | 217 | CORE_ADDR address, |
f594e5e9 MC |
218 | enum minimal_symbol_type ms_type, |
219 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 220 | { |
08feed99 | 221 | struct gdbarch *gdbarch = objfile->arch (); |
5e2b427d | 222 | |
0875794a JK |
223 | if (ms_type == mst_text || ms_type == mst_file_text |
224 | || ms_type == mst_text_gnu_ifunc) | |
85ddcc70 | 225 | address = gdbarch_addr_bits_remove (gdbarch, address); |
c906108c | 226 | |
44e4c775 AB |
227 | /* We only setup section information for allocatable sections. Usually |
228 | we'd only expect to find msymbols for allocatable sections, but if the | |
229 | ELF is malformed then this might not be the case. In that case don't | |
230 | create an msymbol that references an uninitialised section object. */ | |
231 | int section_index = 0; | |
232 | if ((bfd_section_flags (bfd_section) & SEC_ALLOC) == SEC_ALLOC) | |
233 | section_index = gdb_bfd_section_index (objfile->obfd, bfd_section); | |
234 | ||
4b610737 | 235 | struct minimal_symbol *result |
44e4c775 | 236 | = reader.record_full (name, copy_name, address, ms_type, section_index); |
4b610737 TT |
237 | if ((objfile->flags & OBJF_MAINLINE) == 0 |
238 | && (ms_type == mst_data || ms_type == mst_bss)) | |
239 | result->maybe_copied = 1; | |
240 | ||
241 | return result; | |
c906108c SS |
242 | } |
243 | ||
7f86f058 | 244 | /* Read the symbol table of an ELF file. |
c906108c | 245 | |
62553543 | 246 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
247 | symbol table contains regular, dynamic, or synthetic symbols, add all |
248 | the global function and data symbols to the minimal symbol table. | |
c906108c | 249 | |
c5aa993b JM |
250 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
251 | defined in the ELF symbol table, which can be used to locate | |
252 | the beginnings of sections from each ".o" file that was linked to | |
253 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 254 | in data structures hung off the objfile's private data. */ |
c906108c | 255 | |
6f610d07 UW |
256 | #define ST_REGULAR 0 |
257 | #define ST_DYNAMIC 1 | |
258 | #define ST_SYNTHETIC 2 | |
259 | ||
c906108c | 260 | static void |
8dddcb8f TT |
261 | elf_symtab_read (minimal_symbol_reader &reader, |
262 | struct objfile *objfile, int type, | |
04a679b8 | 263 | long number_of_symbols, asymbol **symbol_table, |
ce6c454e | 264 | bool copy_names) |
c906108c | 265 | { |
08feed99 | 266 | struct gdbarch *gdbarch = objfile->arch (); |
c906108c | 267 | asymbol *sym; |
c906108c | 268 | long i; |
c906108c SS |
269 | CORE_ADDR symaddr; |
270 | enum minimal_symbol_type ms_type; | |
18a94d75 DE |
271 | /* Name of the last file symbol. This is either a constant string or is |
272 | saved on the objfile's filename cache. */ | |
0af1e9a5 | 273 | const char *filesymname = ""; |
d4f3574e | 274 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
3e29f34a MR |
275 | int elf_make_msymbol_special_p |
276 | = gdbarch_elf_make_msymbol_special_p (gdbarch); | |
c5aa993b | 277 | |
0cc7b392 | 278 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 279 | { |
0cc7b392 DJ |
280 | sym = symbol_table[i]; |
281 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 282 | { |
0cc7b392 | 283 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 284 | that are null strings (may happen). */ |
0cc7b392 DJ |
285 | continue; |
286 | } | |
c906108c | 287 | |
74763737 DJ |
288 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
289 | symbols which do not correspond to objects in the symbol table, | |
290 | but have some other target-specific meaning. */ | |
291 | if (bfd_is_target_special_symbol (objfile->obfd, sym)) | |
60c5725c DJ |
292 | { |
293 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
294 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
295 | continue; | |
296 | } | |
74763737 | 297 | |
6f610d07 | 298 | if (type == ST_DYNAMIC |
45dfa85a | 299 | && sym->section == bfd_und_section_ptr |
0cc7b392 DJ |
300 | && (sym->flags & BSF_FUNCTION)) |
301 | { | |
302 | struct minimal_symbol *msym; | |
02c75f72 | 303 | bfd *abfd = objfile->obfd; |
dea91a5c | 304 | asection *sect; |
0cc7b392 DJ |
305 | |
306 | /* Symbol is a reference to a function defined in | |
307 | a shared library. | |
308 | If its value is non zero then it is usually the address | |
309 | of the corresponding entry in the procedure linkage table, | |
310 | plus the desired section offset. | |
311 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 312 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
313 | for this symbol in the executable file, so we skip it. */ |
314 | symaddr = sym->value; | |
315 | if (symaddr == 0) | |
316 | continue; | |
02c75f72 UW |
317 | |
318 | /* sym->section is the undefined section. However, we want to | |
319 | record the section where the PLT stub resides with the | |
320 | minimal symbol. Search the section table for the one that | |
321 | covers the stub's address. */ | |
322 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
323 | { | |
fd361982 | 324 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
02c75f72 UW |
325 | continue; |
326 | ||
fd361982 AM |
327 | if (symaddr >= bfd_section_vma (sect) |
328 | && symaddr < bfd_section_vma (sect) | |
329 | + bfd_section_size (sect)) | |
02c75f72 UW |
330 | break; |
331 | } | |
332 | if (!sect) | |
333 | continue; | |
334 | ||
828cfa8d JB |
335 | /* On ia64-hpux, we have discovered that the system linker |
336 | adds undefined symbols with nonzero addresses that cannot | |
337 | be right (their address points inside the code of another | |
338 | function in the .text section). This creates problems | |
339 | when trying to determine which symbol corresponds to | |
340 | a given address. | |
341 | ||
342 | We try to detect those buggy symbols by checking which | |
343 | section we think they correspond to. Normally, PLT symbols | |
344 | are stored inside their own section, and the typical name | |
345 | for that section is ".plt". So, if there is a ".plt" | |
346 | section, and yet the section name of our symbol does not | |
347 | start with ".plt", we ignore that symbol. */ | |
61012eef | 348 | if (!startswith (sect->name, ".plt") |
828cfa8d JB |
349 | && bfd_get_section_by_name (abfd, ".plt") != NULL) |
350 | continue; | |
351 | ||
0cc7b392 | 352 | msym = record_minimal_symbol |
31edb802 | 353 | (reader, sym->name, copy_names, |
04a679b8 | 354 | symaddr, mst_solib_trampoline, sect, objfile); |
0cc7b392 | 355 | if (msym != NULL) |
9b807e7b MR |
356 | { |
357 | msym->filename = filesymname; | |
3e29f34a MR |
358 | if (elf_make_msymbol_special_p) |
359 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
9b807e7b | 360 | } |
0cc7b392 DJ |
361 | continue; |
362 | } | |
c906108c | 363 | |
0cc7b392 DJ |
364 | /* If it is a nonstripped executable, do not enter dynamic |
365 | symbols, as the dynamic symbol table is usually a subset | |
366 | of the main symbol table. */ | |
6f610d07 | 367 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
368 | continue; |
369 | if (sym->flags & BSF_FILE) | |
be1e3d3e | 370 | filesymname = objfile->intern (sym->name); |
0cc7b392 DJ |
371 | else if (sym->flags & BSF_SECTION_SYM) |
372 | continue; | |
bb869963 SDJ |
373 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK |
374 | | BSF_GNU_UNIQUE)) | |
0cc7b392 DJ |
375 | { |
376 | struct minimal_symbol *msym; | |
377 | ||
378 | /* Select global/local/weak symbols. Note that bfd puts abs | |
379 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
380 | interested in will have a section. */ |
381 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 382 | symaddr = sym->value + sym->section->vma; |
0cc7b392 DJ |
383 | /* For non-absolute symbols, use the type of the section |
384 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 385 | no way of figuring this out for absolute symbols. */ |
45dfa85a | 386 | if (sym->section == bfd_abs_section_ptr) |
c906108c | 387 | { |
0cc7b392 DJ |
388 | /* This is a hack to get the minimal symbol type |
389 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
390 | with special section indices for dynamic symbols. |
391 | ||
392 | NOTE: uweigand-20071112: Synthetic symbols do not | |
393 | have an ELF-private part, so do not touch those. */ | |
dea91a5c | 394 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
0cc7b392 DJ |
395 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
396 | ||
397 | switch (shndx) | |
c906108c | 398 | { |
0cc7b392 DJ |
399 | case SHN_MIPS_TEXT: |
400 | ms_type = mst_text; | |
401 | break; | |
402 | case SHN_MIPS_DATA: | |
403 | ms_type = mst_data; | |
404 | break; | |
405 | case SHN_MIPS_ACOMMON: | |
406 | ms_type = mst_bss; | |
407 | break; | |
408 | default: | |
409 | ms_type = mst_abs; | |
410 | } | |
411 | ||
412 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 413 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
414 | if (ms_type != mst_abs) |
415 | { | |
416 | if (sym->name[0] == '.') | |
417 | continue; | |
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 | { |
f50776aa PA |
454 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
455 | { | |
456 | ms_type = mst_data_gnu_ifunc; | |
457 | } | |
458 | else if (sym->section->flags & SEC_LOAD) | |
c906108c | 459 | { |
0cc7b392 | 460 | ms_type = mst_data; |
c906108c | 461 | } |
c906108c SS |
462 | else |
463 | { | |
0cc7b392 | 464 | ms_type = mst_bss; |
c906108c SS |
465 | } |
466 | } | |
0cc7b392 | 467 | else if (sym->flags & BSF_LOCAL) |
c906108c | 468 | { |
0cc7b392 DJ |
469 | if (sym->section->flags & SEC_LOAD) |
470 | { | |
471 | ms_type = mst_file_data; | |
c906108c SS |
472 | } |
473 | else | |
474 | { | |
0cc7b392 | 475 | ms_type = mst_file_bss; |
c906108c SS |
476 | } |
477 | } | |
478 | else | |
479 | { | |
0cc7b392 | 480 | ms_type = mst_unknown; |
c906108c | 481 | } |
0cc7b392 DJ |
482 | } |
483 | else | |
484 | { | |
485 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 486 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
487 | hob with actions like finding what function the PC |
488 | is in. Ignore them if they aren't text, data, or bss. */ | |
489 | /* ms_type = mst_unknown; */ | |
0963b4bd | 490 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
491 | } |
492 | msym = record_minimal_symbol | |
31edb802 | 493 | (reader, sym->name, copy_names, symaddr, |
0cc7b392 | 494 | ms_type, sym->section, objfile); |
6f610d07 | 495 | |
0cc7b392 DJ |
496 | if (msym) |
497 | { | |
6f610d07 | 498 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an |
24c274a1 | 499 | ELF-private part. */ |
6f610d07 | 500 | if (type != ST_SYNTHETIC) |
24c274a1 AM |
501 | { |
502 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
503 | elf_symbol_type *elf_sym = (elf_symbol_type *) sym; | |
504 | SET_MSYMBOL_SIZE (msym, elf_sym->internal_elf_sym.st_size); | |
505 | } | |
dea91a5c | 506 | |
a103a963 | 507 | msym->filename = filesymname; |
3e29f34a MR |
508 | if (elf_make_msymbol_special_p) |
509 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 510 | } |
2eaf8d2a | 511 | |
715c6909 TT |
512 | /* If we see a default versioned symbol, install it under |
513 | its version-less name. */ | |
514 | if (msym != NULL) | |
515 | { | |
516 | const char *atsign = strchr (sym->name, '@'); | |
517 | ||
518 | if (atsign != NULL && atsign[1] == '@' && atsign > sym->name) | |
519 | { | |
520 | int len = atsign - sym->name; | |
521 | ||
31edb802 CB |
522 | record_minimal_symbol (reader, |
523 | gdb::string_view (sym->name, len), | |
524 | true, symaddr, ms_type, sym->section, | |
525 | objfile); | |
715c6909 TT |
526 | } |
527 | } | |
528 | ||
2eaf8d2a DJ |
529 | /* For @plt symbols, also record a trampoline to the |
530 | destination symbol. The @plt symbol will be used in | |
531 | disassembly, and the trampoline will be used when we are | |
532 | trying to find the target. */ | |
533 | if (msym && ms_type == mst_text && type == ST_SYNTHETIC) | |
534 | { | |
535 | int len = strlen (sym->name); | |
536 | ||
537 | if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0) | |
538 | { | |
2eaf8d2a DJ |
539 | struct minimal_symbol *mtramp; |
540 | ||
31edb802 CB |
541 | mtramp = record_minimal_symbol |
542 | (reader, gdb::string_view (sym->name, len - 4), true, | |
543 | symaddr, mst_solib_trampoline, sym->section, objfile); | |
2eaf8d2a DJ |
544 | if (mtramp) |
545 | { | |
d9eaeb59 | 546 | SET_MSYMBOL_SIZE (mtramp, MSYMBOL_SIZE (msym)); |
422d65e7 | 547 | mtramp->created_by_gdb = 1; |
2eaf8d2a | 548 | mtramp->filename = filesymname; |
3e29f34a MR |
549 | if (elf_make_msymbol_special_p) |
550 | gdbarch_elf_make_msymbol_special (gdbarch, | |
551 | sym, mtramp); | |
2eaf8d2a DJ |
552 | } |
553 | } | |
554 | } | |
c906108c | 555 | } |
c906108c SS |
556 | } |
557 | } | |
558 | ||
07be84bf JK |
559 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
560 | for later look ups of which function to call when user requests | |
561 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
562 | library defining `function' we cannot yet know while reading OBJFILE which | |
563 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
564 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
565 | ||
566 | static void | |
8dddcb8f TT |
567 | elf_rel_plt_read (minimal_symbol_reader &reader, |
568 | struct objfile *objfile, asymbol **dyn_symbol_table) | |
07be84bf JK |
569 | { |
570 | bfd *obfd = objfile->obfd; | |
571 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); | |
02e169e2 | 572 | asection *relplt, *got_plt; |
07be84bf | 573 | bfd_size_type reloc_count, reloc; |
08feed99 | 574 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf JK |
575 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
576 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
577 | ||
578 | if (objfile->separate_debug_objfile_backlink) | |
579 | return; | |
580 | ||
07be84bf JK |
581 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); |
582 | if (got_plt == NULL) | |
4b7d1f7f WN |
583 | { |
584 | /* For platforms where there is no separate .got.plt. */ | |
585 | got_plt = bfd_get_section_by_name (obfd, ".got"); | |
586 | if (got_plt == NULL) | |
587 | return; | |
588 | } | |
07be84bf | 589 | |
02e169e2 PA |
590 | /* Depending on system, we may find jump slots in a relocation |
591 | section for either .got.plt or .plt. */ | |
592 | asection *plt = bfd_get_section_by_name (obfd, ".plt"); | |
593 | int plt_elf_idx = (plt != NULL) ? elf_section_data (plt)->this_idx : -1; | |
594 | ||
595 | int got_plt_elf_idx = elf_section_data (got_plt)->this_idx; | |
596 | ||
07be84bf JK |
597 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ |
598 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
02e169e2 PA |
599 | { |
600 | const auto &this_hdr = elf_section_data (relplt)->this_hdr; | |
601 | ||
602 | if (this_hdr.sh_type == SHT_REL || this_hdr.sh_type == SHT_RELA) | |
603 | { | |
604 | if (this_hdr.sh_info == plt_elf_idx | |
605 | || this_hdr.sh_info == got_plt_elf_idx) | |
606 | break; | |
607 | } | |
608 | } | |
07be84bf JK |
609 | if (relplt == NULL) |
610 | return; | |
611 | ||
612 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
613 | return; | |
614 | ||
26fcd5d7 | 615 | std::string string_buffer; |
07be84bf | 616 | |
02e169e2 PA |
617 | /* Does ADDRESS reside in SECTION of OBFD? */ |
618 | auto within_section = [obfd] (asection *section, CORE_ADDR address) | |
619 | { | |
620 | if (section == NULL) | |
621 | return false; | |
622 | ||
fd361982 AM |
623 | return (bfd_section_vma (section) <= address |
624 | && (address < bfd_section_vma (section) | |
625 | + bfd_section_size (section))); | |
02e169e2 PA |
626 | }; |
627 | ||
07be84bf JK |
628 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; |
629 | for (reloc = 0; reloc < reloc_count; reloc++) | |
630 | { | |
22e048c9 | 631 | const char *name; |
07be84bf JK |
632 | struct minimal_symbol *msym; |
633 | CORE_ADDR address; | |
26fcd5d7 | 634 | const char *got_suffix = SYMBOL_GOT_PLT_SUFFIX; |
07be84bf | 635 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
07be84bf JK |
636 | |
637 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
07be84bf JK |
638 | address = relplt->relocation[reloc].address; |
639 | ||
02e169e2 PA |
640 | asection *msym_section; |
641 | ||
642 | /* Does the pointer reside in either the .got.plt or .plt | |
643 | sections? */ | |
644 | if (within_section (got_plt, address)) | |
645 | msym_section = got_plt; | |
646 | else if (within_section (plt, address)) | |
647 | msym_section = plt; | |
648 | else | |
07be84bf JK |
649 | continue; |
650 | ||
f50776aa PA |
651 | /* We cannot check if NAME is a reference to |
652 | mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the | |
653 | symbol is undefined and the objfile having NAME defined may | |
654 | not yet have been loaded. */ | |
07be84bf | 655 | |
26fcd5d7 TT |
656 | string_buffer.assign (name); |
657 | string_buffer.append (got_suffix, got_suffix + got_suffix_len); | |
07be84bf | 658 | |
31edb802 | 659 | msym = record_minimal_symbol (reader, string_buffer, |
02e169e2 PA |
660 | true, address, mst_slot_got_plt, |
661 | msym_section, objfile); | |
07be84bf | 662 | if (msym) |
d9eaeb59 | 663 | SET_MSYMBOL_SIZE (msym, ptr_size); |
07be84bf | 664 | } |
07be84bf JK |
665 | } |
666 | ||
667 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
668 | ||
8127a2fa TT |
669 | static const struct objfile_key<htab, htab_deleter> |
670 | elf_objfile_gnu_ifunc_cache_data; | |
07be84bf JK |
671 | |
672 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
673 | ||
674 | struct elf_gnu_ifunc_cache | |
675 | { | |
676 | /* This is always a function entry address, not a function descriptor. */ | |
677 | CORE_ADDR addr; | |
678 | ||
679 | char name[1]; | |
680 | }; | |
681 | ||
682 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
683 | ||
684 | static hashval_t | |
685 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
686 | { | |
9a3c8263 SM |
687 | const struct elf_gnu_ifunc_cache *a |
688 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
07be84bf JK |
689 | |
690 | return htab_hash_string (a->name); | |
691 | } | |
692 | ||
693 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
694 | ||
695 | static int | |
696 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
697 | { | |
9a3c8263 SM |
698 | const struct elf_gnu_ifunc_cache *a |
699 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
700 | const struct elf_gnu_ifunc_cache *b | |
701 | = (const struct elf_gnu_ifunc_cache *) b_voidp; | |
07be84bf JK |
702 | |
703 | return strcmp (a->name, b->name) == 0; | |
704 | } | |
705 | ||
706 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
707 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
708 | valid and therefore they were successfully recorded, return 0 otherwise. | |
709 | ||
710 | Function does not expect a duplicate entry. Use | |
711 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
712 | exists. */ | |
713 | ||
714 | static int | |
715 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
716 | { | |
7cbd4a93 | 717 | struct bound_minimal_symbol msym; |
07be84bf JK |
718 | struct objfile *objfile; |
719 | htab_t htab; | |
720 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
721 | void **slot; | |
722 | ||
723 | msym = lookup_minimal_symbol_by_pc (addr); | |
7cbd4a93 | 724 | if (msym.minsym == NULL) |
07be84bf | 725 | return 0; |
77e371c0 | 726 | if (BMSYMBOL_VALUE_ADDRESS (msym) != addr) |
07be84bf | 727 | return 0; |
e27d198c | 728 | objfile = msym.objfile; |
07be84bf JK |
729 | |
730 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
1adeb822 | 731 | resolution and it has no use for GDB. */ |
c9d95fa3 | 732 | const char *target_name = msym.minsym->linkage_name (); |
1adeb822 PA |
733 | size_t len = strlen (target_name); |
734 | ||
735 | /* Note we check the symbol's name instead of checking whether the | |
736 | symbol is in the .plt section because some systems have @plt | |
737 | symbols in the .text section. */ | |
738 | if (len > 4 && strcmp (target_name + len - 4, "@plt") == 0) | |
07be84bf JK |
739 | return 0; |
740 | ||
8127a2fa | 741 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); |
07be84bf JK |
742 | if (htab == NULL) |
743 | { | |
8127a2fa TT |
744 | htab = htab_create_alloc (1, elf_gnu_ifunc_cache_hash, |
745 | elf_gnu_ifunc_cache_eq, | |
746 | NULL, xcalloc, xfree); | |
747 | elf_objfile_gnu_ifunc_cache_data.set (objfile, htab); | |
07be84bf JK |
748 | } |
749 | ||
750 | entry_local.addr = addr; | |
751 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
752 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
753 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
224c3ddb SM |
754 | entry_p |
755 | = (struct elf_gnu_ifunc_cache *) obstack_finish (&objfile->objfile_obstack); | |
07be84bf JK |
756 | |
757 | slot = htab_find_slot (htab, entry_p, INSERT); | |
758 | if (*slot != NULL) | |
759 | { | |
9a3c8263 SM |
760 | struct elf_gnu_ifunc_cache *entry_found_p |
761 | = (struct elf_gnu_ifunc_cache *) *slot; | |
08feed99 | 762 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf JK |
763 | |
764 | if (entry_found_p->addr != addr) | |
765 | { | |
766 | /* This case indicates buggy inferior program, the resolved address | |
767 | should never change. */ | |
768 | ||
769 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
770 | "function_address from %s to %s"), | |
771 | name, paddress (gdbarch, entry_found_p->addr), | |
772 | paddress (gdbarch, addr)); | |
773 | } | |
774 | ||
775 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
776 | } | |
777 | *slot = entry_p; | |
778 | ||
779 | return 1; | |
780 | } | |
781 | ||
782 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
783 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
784 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
785 | ||
786 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
787 | function. */ | |
788 | ||
789 | static int | |
790 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
791 | { | |
2030c079 | 792 | for (objfile *objfile : current_program_space->objfiles ()) |
07be84bf JK |
793 | { |
794 | htab_t htab; | |
795 | struct elf_gnu_ifunc_cache *entry_p; | |
796 | void **slot; | |
797 | ||
8127a2fa | 798 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); |
07be84bf JK |
799 | if (htab == NULL) |
800 | continue; | |
801 | ||
224c3ddb SM |
802 | entry_p = ((struct elf_gnu_ifunc_cache *) |
803 | alloca (sizeof (*entry_p) + strlen (name))); | |
07be84bf JK |
804 | strcpy (entry_p->name, name); |
805 | ||
806 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
807 | if (slot == NULL) | |
808 | continue; | |
9a3c8263 | 809 | entry_p = (struct elf_gnu_ifunc_cache *) *slot; |
07be84bf JK |
810 | gdb_assert (entry_p != NULL); |
811 | ||
812 | if (addr_p) | |
813 | *addr_p = entry_p->addr; | |
814 | return 1; | |
815 | } | |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
820 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
821 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
822 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
823 | ||
824 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
825 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
826 | prevent cache entries duplicates. */ | |
827 | ||
828 | static int | |
829 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
830 | { | |
831 | char *name_got_plt; | |
07be84bf JK |
832 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
833 | ||
224c3ddb | 834 | name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1); |
07be84bf JK |
835 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); |
836 | ||
2030c079 | 837 | for (objfile *objfile : current_program_space->objfiles ()) |
07be84bf JK |
838 | { |
839 | bfd *obfd = objfile->obfd; | |
08feed99 | 840 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf JK |
841 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
842 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
843 | CORE_ADDR pointer_address, addr; | |
844 | asection *plt; | |
224c3ddb | 845 | gdb_byte *buf = (gdb_byte *) alloca (ptr_size); |
3b7344d5 | 846 | struct bound_minimal_symbol msym; |
07be84bf JK |
847 | |
848 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
3b7344d5 | 849 | if (msym.minsym == NULL) |
07be84bf | 850 | continue; |
3b7344d5 | 851 | if (MSYMBOL_TYPE (msym.minsym) != mst_slot_got_plt) |
07be84bf | 852 | continue; |
77e371c0 | 853 | pointer_address = BMSYMBOL_VALUE_ADDRESS (msym); |
07be84bf JK |
854 | |
855 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
856 | if (plt == NULL) | |
857 | continue; | |
858 | ||
3b7344d5 | 859 | if (MSYMBOL_SIZE (msym.minsym) != ptr_size) |
07be84bf JK |
860 | continue; |
861 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
862 | continue; | |
863 | addr = extract_typed_address (buf, ptr_type); | |
328d42d8 SM |
864 | addr = gdbarch_convert_from_func_ptr_addr |
865 | (gdbarch, addr, current_inferior ()->top_target ()); | |
4b7d1f7f | 866 | addr = gdbarch_addr_bits_remove (gdbarch, addr); |
07be84bf | 867 | |
07be84bf | 868 | if (elf_gnu_ifunc_record_cache (name, addr)) |
28f4fa4d PA |
869 | { |
870 | if (addr_p != NULL) | |
871 | *addr_p = addr; | |
872 | return 1; | |
873 | } | |
07be84bf JK |
874 | } |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
880 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
ececd218 | 881 | is not NULL) and the function returns true. It returns false otherwise. |
07be84bf JK |
882 | |
883 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
884 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
885 | ||
ececd218 | 886 | static bool |
07be84bf JK |
887 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) |
888 | { | |
889 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
ececd218 | 890 | return true; |
dea91a5c | 891 | |
07be84bf | 892 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
ececd218 | 893 | return true; |
07be84bf | 894 | |
ececd218 | 895 | return false; |
07be84bf JK |
896 | } |
897 | ||
898 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
899 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
900 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
901 | */ | |
902 | ||
903 | static CORE_ADDR | |
904 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
905 | { | |
2c02bd72 | 906 | const char *name_at_pc; |
07be84bf JK |
907 | CORE_ADDR start_at_pc, address; |
908 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
909 | struct value *function, *address_val; | |
e1b2624a AA |
910 | CORE_ADDR hwcap = 0; |
911 | struct value *hwcap_val; | |
07be84bf JK |
912 | |
913 | /* Try first any non-intrusive methods without an inferior call. */ | |
914 | ||
915 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
916 | && start_at_pc == pc) | |
917 | { | |
918 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
919 | return address; | |
920 | } | |
921 | else | |
922 | name_at_pc = NULL; | |
923 | ||
924 | function = allocate_value (func_func_type); | |
1a088441 | 925 | VALUE_LVAL (function) = lval_memory; |
07be84bf JK |
926 | set_value_address (function, pc); |
927 | ||
e1b2624a AA |
928 | /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as |
929 | parameter. FUNCTION is the function entry address. ADDRESS may be a | |
930 | function descriptor. */ | |
07be84bf | 931 | |
328d42d8 | 932 | target_auxv_search (current_inferior ()->top_target (), AT_HWCAP, &hwcap); |
e1b2624a AA |
933 | hwcap_val = value_from_longest (builtin_type (gdbarch) |
934 | ->builtin_unsigned_long, hwcap); | |
e71585ff | 935 | address_val = call_function_by_hand (function, NULL, hwcap_val); |
07be84bf | 936 | address = value_as_address (address_val); |
328d42d8 SM |
937 | address = gdbarch_convert_from_func_ptr_addr |
938 | (gdbarch, address, current_inferior ()->top_target ()); | |
4b7d1f7f | 939 | address = gdbarch_addr_bits_remove (gdbarch, address); |
07be84bf JK |
940 | |
941 | if (name_at_pc) | |
942 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
943 | ||
944 | return address; | |
945 | } | |
946 | ||
0e30163f JK |
947 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
948 | ||
949 | static void | |
950 | elf_gnu_ifunc_resolver_stop (struct breakpoint *b) | |
951 | { | |
952 | struct breakpoint *b_return; | |
953 | struct frame_info *prev_frame = get_prev_frame (get_current_frame ()); | |
954 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); | |
955 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
00431a78 | 956 | int thread_id = inferior_thread ()->global_num; |
0e30163f JK |
957 | |
958 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
959 | ||
960 | for (b_return = b->related_breakpoint; b_return != b; | |
961 | b_return = b_return->related_breakpoint) | |
962 | { | |
963 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
964 | gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL); | |
965 | gdb_assert (frame_id_p (b_return->frame_id)); | |
966 | ||
967 | if (b_return->thread == thread_id | |
968 | && b_return->loc->requested_address == prev_pc | |
969 | && frame_id_eq (b_return->frame_id, prev_frame_id)) | |
970 | break; | |
971 | } | |
972 | ||
973 | if (b_return == b) | |
974 | { | |
0e30163f JK |
975 | /* No need to call find_pc_line for symbols resolving as this is only |
976 | a helper breakpointer never shown to the user. */ | |
977 | ||
51abb421 | 978 | symtab_and_line sal; |
0e30163f JK |
979 | sal.pspace = current_inferior ()->pspace; |
980 | sal.pc = prev_pc; | |
981 | sal.section = find_pc_overlay (sal.pc); | |
982 | sal.explicit_pc = 1; | |
454dafbd TT |
983 | b_return |
984 | = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
985 | prev_frame_id, | |
986 | bp_gnu_ifunc_resolver_return).release (); | |
0e30163f | 987 | |
c70a6932 JK |
988 | /* set_momentary_breakpoint invalidates PREV_FRAME. */ |
989 | prev_frame = NULL; | |
990 | ||
0e30163f JK |
991 | /* Add new b_return to the ring list b->related_breakpoint. */ |
992 | gdb_assert (b_return->related_breakpoint == b_return); | |
993 | b_return->related_breakpoint = b->related_breakpoint; | |
994 | b->related_breakpoint = b_return; | |
995 | } | |
996 | } | |
997 | ||
998 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
999 | ||
1000 | static void | |
1001 | elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b) | |
1002 | { | |
00431a78 | 1003 | thread_info *thread = inferior_thread (); |
0e30163f JK |
1004 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
1005 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
1006 | struct type *value_type = TYPE_TARGET_TYPE (func_func_type); | |
00431a78 | 1007 | struct regcache *regcache = get_thread_regcache (thread); |
6a3a010b | 1008 | struct value *func_func; |
0e30163f JK |
1009 | struct value *value; |
1010 | CORE_ADDR resolved_address, resolved_pc; | |
0e30163f JK |
1011 | |
1012 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
1013 | ||
0e30163f JK |
1014 | while (b->related_breakpoint != b) |
1015 | { | |
1016 | struct breakpoint *b_next = b->related_breakpoint; | |
1017 | ||
1018 | switch (b->type) | |
1019 | { | |
1020 | case bp_gnu_ifunc_resolver: | |
1021 | break; | |
1022 | case bp_gnu_ifunc_resolver_return: | |
1023 | delete_breakpoint (b); | |
1024 | break; | |
1025 | default: | |
1026 | internal_error (__FILE__, __LINE__, | |
1027 | _("handle_inferior_event: Invalid " | |
1028 | "gnu-indirect-function breakpoint type %d"), | |
1029 | (int) b->type); | |
1030 | } | |
1031 | b = b_next; | |
1032 | } | |
1033 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
6a3a010b MR |
1034 | gdb_assert (b->loc->next == NULL); |
1035 | ||
1036 | func_func = allocate_value (func_func_type); | |
1a088441 | 1037 | VALUE_LVAL (func_func) = lval_memory; |
6a3a010b MR |
1038 | set_value_address (func_func, b->loc->related_address); |
1039 | ||
1040 | value = allocate_value (value_type); | |
1041 | gdbarch_return_value (gdbarch, func_func, value_type, regcache, | |
1042 | value_contents_raw (value), NULL); | |
1043 | resolved_address = value_as_address (value); | |
328d42d8 SM |
1044 | resolved_pc = gdbarch_convert_from_func_ptr_addr |
1045 | (gdbarch, resolved_address, current_inferior ()->top_target ()); | |
4b7d1f7f | 1046 | resolved_pc = gdbarch_addr_bits_remove (gdbarch, resolved_pc); |
0e30163f | 1047 | |
f8eba3c6 | 1048 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
d28cd78a | 1049 | elf_gnu_ifunc_record_cache (event_location_to_string (b->location.get ()), |
f00aae0f | 1050 | resolved_pc); |
0e30163f | 1051 | |
0e30163f | 1052 | b->type = bp_breakpoint; |
6c5b2ebe | 1053 | update_breakpoint_locations (b, current_program_space, |
79188d8d PA |
1054 | find_function_start_sal (resolved_pc, NULL, true), |
1055 | {}); | |
0e30163f JK |
1056 | } |
1057 | ||
2750ef27 TT |
1058 | /* A helper function for elf_symfile_read that reads the minimal |
1059 | symbols. */ | |
c906108c SS |
1060 | |
1061 | static void | |
5f6cac40 TT |
1062 | elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags, |
1063 | const struct elfinfo *ei) | |
c906108c | 1064 | { |
63524580 | 1065 | bfd *synth_abfd, *abfd = objfile->obfd; |
62553543 EZ |
1066 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1067 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1068 | asymbol *synthsyms; | |
c906108c | 1069 | |
45cfd468 DE |
1070 | if (symtab_create_debug) |
1071 | { | |
1072 | fprintf_unfiltered (gdb_stdlog, | |
1073 | "Reading minimal symbols of objfile %s ...\n", | |
4262abfb | 1074 | objfile_name (objfile)); |
45cfd468 DE |
1075 | } |
1076 | ||
5f6cac40 TT |
1077 | /* If we already have minsyms, then we can skip some work here. |
1078 | However, if there were stabs or mdebug sections, we go ahead and | |
1079 | redo all the work anyway, because the psym readers for those | |
1080 | kinds of debuginfo need extra information found here. This can | |
1081 | go away once all types of symbols are in the per-BFD object. */ | |
1082 | if (objfile->per_bfd->minsyms_read | |
1083 | && ei->stabsect == NULL | |
30d1f018 WP |
1084 | && ei->mdebugsect == NULL |
1085 | && ei->ctfsect == NULL) | |
5f6cac40 TT |
1086 | { |
1087 | if (symtab_create_debug) | |
1088 | fprintf_unfiltered (gdb_stdlog, | |
1089 | "... minimal symbols previously read\n"); | |
1090 | return; | |
1091 | } | |
1092 | ||
d25e8719 | 1093 | minimal_symbol_reader reader (objfile); |
c906108c | 1094 | |
18a94d75 | 1095 | /* Process the normal ELF symbol table first. */ |
c906108c | 1096 | |
62553543 EZ |
1097 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
1098 | if (storage_needed < 0) | |
3e43a32a MS |
1099 | error (_("Can't read symbols from %s: %s"), |
1100 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1101 | bfd_errmsg (bfd_get_error ())); |
1102 | ||
1103 | if (storage_needed > 0) | |
1104 | { | |
80c57053 JK |
1105 | /* Memory gets permanently referenced from ABFD after |
1106 | bfd_canonicalize_symtab so it must not get freed before ABFD gets. */ | |
1107 | ||
224c3ddb | 1108 | symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
62553543 EZ |
1109 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
1110 | ||
1111 | if (symcount < 0) | |
3e43a32a MS |
1112 | error (_("Can't read symbols from %s: %s"), |
1113 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1114 | bfd_errmsg (bfd_get_error ())); |
1115 | ||
ce6c454e TT |
1116 | elf_symtab_read (reader, objfile, ST_REGULAR, symcount, symbol_table, |
1117 | false); | |
62553543 | 1118 | } |
c906108c SS |
1119 | |
1120 | /* Add the dynamic symbols. */ | |
1121 | ||
62553543 EZ |
1122 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
1123 | ||
1124 | if (storage_needed > 0) | |
1125 | { | |
3f1eff0a JK |
1126 | /* Memory gets permanently referenced from ABFD after |
1127 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1128 | It happens only in the case when elf_slurp_reloc_table sees | |
1129 | asection->relocation NULL. Determining which section is asection is | |
1130 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1131 | implementation detail, though. */ | |
1132 | ||
224c3ddb | 1133 | dyn_symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
62553543 EZ |
1134 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
1135 | dyn_symbol_table); | |
1136 | ||
1137 | if (dynsymcount < 0) | |
3e43a32a MS |
1138 | error (_("Can't read symbols from %s: %s"), |
1139 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1140 | bfd_errmsg (bfd_get_error ())); |
1141 | ||
8dddcb8f | 1142 | elf_symtab_read (reader, objfile, ST_DYNAMIC, dynsymcount, |
ce6c454e | 1143 | dyn_symbol_table, false); |
07be84bf | 1144 | |
8dddcb8f | 1145 | elf_rel_plt_read (reader, objfile, dyn_symbol_table); |
62553543 EZ |
1146 | } |
1147 | ||
63524580 JK |
1148 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1149 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1150 | ||
1151 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1152 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1153 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1154 | read the code address from .opd while it reads the .symtab section from | |
1155 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1156 | ||
1157 | With SYNTH_ABFD the .opd section will be read from the original | |
1158 | backlinked binary where it is valid. */ | |
1159 | ||
1160 | if (objfile->separate_debug_objfile_backlink) | |
1161 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd; | |
1162 | else | |
1163 | synth_abfd = abfd; | |
1164 | ||
62553543 EZ |
1165 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1166 | ||
63524580 | 1167 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1168 | dynsymcount, dyn_symbol_table, |
1169 | &synthsyms); | |
1170 | if (synthcount > 0) | |
1171 | { | |
62553543 EZ |
1172 | long i; |
1173 | ||
b22e99fd | 1174 | std::unique_ptr<asymbol *[]> |
d1e4a624 | 1175 | synth_symbol_table (new asymbol *[synthcount]); |
62553543 | 1176 | for (i = 0; i < synthcount; i++) |
9f20e3da | 1177 | synth_symbol_table[i] = synthsyms + i; |
8dddcb8f | 1178 | elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount, |
ce6c454e | 1179 | synth_symbol_table.get (), true); |
ba713918 AL |
1180 | |
1181 | xfree (synthsyms); | |
1182 | synthsyms = NULL; | |
62553543 | 1183 | } |
c906108c | 1184 | |
7134143f DJ |
1185 | /* Install any minimal symbols that have been collected as the current |
1186 | minimal symbols for this objfile. The debug readers below this point | |
1187 | should not generate new minimal symbols; if they do it's their | |
1188 | responsibility to install them. "mdebug" appears to be the only one | |
1189 | which will do this. */ | |
1190 | ||
d25e8719 | 1191 | reader.install (); |
7134143f | 1192 | |
4f00dda3 DE |
1193 | if (symtab_create_debug) |
1194 | fprintf_unfiltered (gdb_stdlog, "Done reading minimal symbols.\n"); | |
2750ef27 TT |
1195 | } |
1196 | ||
1197 | /* Scan and build partial symbols for a symbol file. | |
1198 | We have been initialized by a call to elf_symfile_init, which | |
1199 | currently does nothing. | |
1200 | ||
2750ef27 TT |
1201 | This function only does the minimum work necessary for letting the |
1202 | user "name" things symbolically; it does not read the entire symtab. | |
1203 | Instead, it reads the external and static symbols and puts them in partial | |
1204 | symbol tables. When more extensive information is requested of a | |
1205 | file, the corresponding partial symbol table is mutated into a full | |
1206 | fledged symbol table by going back and reading the symbols | |
1207 | for real. | |
1208 | ||
1209 | We look for sections with specific names, to tell us what debug | |
1210 | format to look for: FIXME!!! | |
1211 | ||
1212 | elfstab_build_psymtabs() handles STABS symbols; | |
1213 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1214 | ||
1215 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1216 | like a COFF symbol table, but has only the minimal information necessary | |
1217 | for linking. We process this also, and use the information to | |
1218 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1219 | capability even for files compiled without -g. */ | |
1220 | ||
1221 | static void | |
b15cc25c | 1222 | elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
2750ef27 TT |
1223 | { |
1224 | bfd *abfd = objfile->obfd; | |
1225 | struct elfinfo ei; | |
30d1f018 | 1226 | bool has_dwarf2 = true; |
2750ef27 | 1227 | |
2750ef27 | 1228 | memset ((char *) &ei, 0, sizeof (ei)); |
97cbe998 | 1229 | if (!(objfile->flags & OBJF_READNEVER)) |
08f93a1a TT |
1230 | { |
1231 | for (asection *sect : gdb_bfd_sections (abfd)) | |
1232 | elf_locate_sections (sect, &ei); | |
1233 | } | |
c906108c | 1234 | |
5f6cac40 TT |
1235 | elf_read_minimal_symbols (objfile, symfile_flags, &ei); |
1236 | ||
c906108c SS |
1237 | /* ELF debugging information is inserted into the psymtab in the |
1238 | order of least informative first - most informative last. Since | |
1239 | the psymtab table is searched `most recent insertion first' this | |
1240 | increases the probability that more detailed debug information | |
1241 | for a section is found. | |
1242 | ||
1243 | For instance, an object file might contain both .mdebug (XCOFF) | |
1244 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1245 | (searched last) and DWARF2 is inserted last (searched first). If | |
1246 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1247 | an included file XCOFF info is useless. */ |
c906108c SS |
1248 | |
1249 | if (ei.mdebugsect) | |
1250 | { | |
1251 | const struct ecoff_debug_swap *swap; | |
1252 | ||
1253 | /* .mdebug section, presumably holding ECOFF debugging | |
dda83cd7 | 1254 | information. */ |
c906108c SS |
1255 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1256 | if (swap) | |
d4f3574e | 1257 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1258 | } |
1259 | if (ei.stabsect) | |
1260 | { | |
1261 | asection *str_sect; | |
1262 | ||
1263 | /* Stab sections have an associated string table that looks like | |
dda83cd7 | 1264 | a separate section. */ |
c906108c SS |
1265 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1266 | ||
1267 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1268 | if (str_sect) | |
1269 | elfstab_build_psymtabs (objfile, | |
086df311 | 1270 | ei.stabsect, |
c906108c | 1271 | str_sect->filepos, |
fd361982 | 1272 | bfd_section_size (str_sect)); |
c906108c | 1273 | } |
9291a0cd | 1274 | |
4b610737 | 1275 | if (dwarf2_has_info (objfile, NULL, true)) |
b11896a5 | 1276 | { |
3c0aa29a | 1277 | dw_index_kind index_kind; |
3e03848b | 1278 | |
eb36a3eb | 1279 | if (dwarf2_initialize_objfile (objfile, &index_kind)) |
3c0aa29a PA |
1280 | { |
1281 | switch (index_kind) | |
1282 | { | |
1283 | case dw_index_kind::GDB_INDEX: | |
e1114590 | 1284 | objfile->qf.push_front (make_dwarf_gdb_index ()); |
3c0aa29a PA |
1285 | break; |
1286 | case dw_index_kind::DEBUG_NAMES: | |
e1114590 | 1287 | objfile->qf.push_front (make_dwarf_debug_names ()); |
3c0aa29a PA |
1288 | break; |
1289 | } | |
1290 | } | |
1291 | else | |
eb36a3eb | 1292 | objfile->qf.emplace_front (new lazy_dwarf_reader); |
b11896a5 | 1293 | } |
3e43a32a MS |
1294 | /* If the file has its own symbol tables it has no separate debug |
1295 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1296 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
8a92335b JK |
1297 | `.note.gnu.build-id'. |
1298 | ||
a8ad4f3c | 1299 | .gnu_debugdata is !objfile::has_partial_symbols because it contains only |
8a92335b JK |
1300 | .symtab, not .debug_* section. But if we already added .gnu_debugdata as |
1301 | an objfile via find_separate_debug_file_in_section there was no separate | |
1302 | debug info available. Therefore do not attempt to search for another one, | |
1303 | objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to | |
1304 | be NULL and we would possibly violate it. */ | |
1305 | ||
a8ad4f3c | 1306 | else if (!objfile->has_partial_symbols () |
8a92335b JK |
1307 | && objfile->separate_debug_objfile == NULL |
1308 | && objfile->separate_debug_objfile_backlink == NULL) | |
9cce227f | 1309 | { |
a8dbfd58 | 1310 | std::string debugfile = find_separate_debug_file_by_buildid (objfile); |
9cce227f | 1311 | |
a8dbfd58 SM |
1312 | if (debugfile.empty ()) |
1313 | debugfile = find_separate_debug_file_by_debuglink (objfile); | |
9cce227f | 1314 | |
a8dbfd58 | 1315 | if (!debugfile.empty ()) |
9cce227f | 1316 | { |
b926417a | 1317 | gdb_bfd_ref_ptr debug_bfd (symfile_bfd_open (debugfile.c_str ())); |
d7f9d729 | 1318 | |
b926417a | 1319 | symbol_file_add_separate (debug_bfd.get (), debugfile.c_str (), |
192b62ce | 1320 | symfile_flags, objfile); |
9cce227f | 1321 | } |
0d79cdc4 AM |
1322 | else |
1323 | { | |
30d1f018 | 1324 | has_dwarf2 = false; |
0d79cdc4 AM |
1325 | const struct bfd_build_id *build_id = build_id_bfd_get (objfile->obfd); |
1326 | ||
1327 | if (build_id != nullptr) | |
1328 | { | |
1329 | gdb::unique_xmalloc_ptr<char> symfile_path; | |
1330 | scoped_fd fd (debuginfod_debuginfo_query (build_id->data, | |
1331 | build_id->size, | |
1332 | objfile->original_name, | |
1333 | &symfile_path)); | |
1334 | ||
1335 | if (fd.get () >= 0) | |
1336 | { | |
1337 | /* File successfully retrieved from server. */ | |
1338 | gdb_bfd_ref_ptr debug_bfd (symfile_bfd_open (symfile_path.get ())); | |
1339 | ||
1340 | if (debug_bfd == nullptr) | |
1341 | warning (_("File \"%s\" from debuginfod cannot be opened as bfd"), | |
1342 | objfile->original_name); | |
1343 | else if (build_id_verify (debug_bfd.get (), build_id->size, build_id->data)) | |
1344 | { | |
1345 | symbol_file_add_separate (debug_bfd.get (), symfile_path.get (), | |
1346 | symfile_flags, objfile); | |
1347 | has_dwarf2 = true; | |
1348 | } | |
1349 | } | |
1350 | } | |
1351 | } | |
30d1f018 WP |
1352 | } |
1353 | ||
1354 | /* Read the CTF section only if there is no DWARF info. */ | |
1355 | if (!has_dwarf2 && ei.ctfsect) | |
1356 | { | |
1357 | elfctf_build_psymtabs (objfile); | |
9cce227f | 1358 | } |
c906108c SS |
1359 | } |
1360 | ||
c906108c SS |
1361 | /* Initialize anything that needs initializing when a completely new symbol |
1362 | file is specified (not just adding some symbols from another file, e.g. a | |
caa429d8 | 1363 | shared library). */ |
c906108c SS |
1364 | |
1365 | static void | |
fba45db2 | 1366 | elf_new_init (struct objfile *ignore) |
c906108c | 1367 | { |
c906108c SS |
1368 | } |
1369 | ||
1370 | /* Perform any local cleanups required when we are done with a particular | |
1371 | objfile. I.E, we are in the process of discarding all symbol information | |
1372 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1373 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1374 | |
1375 | static void | |
fba45db2 | 1376 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1377 | { |
c906108c SS |
1378 | } |
1379 | ||
db7a9bcd | 1380 | /* ELF specific initialization routine for reading symbols. */ |
c906108c SS |
1381 | |
1382 | static void | |
fba45db2 | 1383 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
1384 | { |
1385 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
1386 | find this causes a significant slowdown in gdb then we could | |
1387 | set it in the debug symbol readers only when necessary. */ | |
1388 | objfile->flags |= OBJF_REORDERED; | |
1389 | } | |
1390 | ||
55aa24fb SDJ |
1391 | /* Implementation of `sym_get_probes', as documented in symfile.h. */ |
1392 | ||
814cf43a | 1393 | static const elfread_data & |
55aa24fb SDJ |
1394 | elf_get_probes (struct objfile *objfile) |
1395 | { | |
814cf43a | 1396 | elfread_data *probes_per_bfd = probe_key.get (objfile->obfd); |
55aa24fb | 1397 | |
aaa63a31 | 1398 | if (probes_per_bfd == NULL) |
55aa24fb | 1399 | { |
814cf43a | 1400 | probes_per_bfd = probe_key.emplace (objfile->obfd); |
55aa24fb SDJ |
1401 | |
1402 | /* Here we try to gather information about all types of probes from the | |
1403 | objfile. */ | |
935676c9 | 1404 | for (const static_probe_ops *ops : all_static_probe_ops) |
0782db84 | 1405 | ops->get_probes (probes_per_bfd, objfile); |
55aa24fb SDJ |
1406 | } |
1407 | ||
aaa63a31 | 1408 | return *probes_per_bfd; |
55aa24fb SDJ |
1409 | } |
1410 | ||
c906108c | 1411 | \f |
55aa24fb SDJ |
1412 | |
1413 | /* Implementation `sym_probe_fns', as documented in symfile.h. */ | |
1414 | ||
1415 | static const struct sym_probe_fns elf_probe_fns = | |
1416 | { | |
25f9533e | 1417 | elf_get_probes, /* sym_get_probes */ |
55aa24fb SDJ |
1418 | }; |
1419 | ||
c906108c SS |
1420 | /* Register that we are able to handle ELF object file formats. */ |
1421 | ||
00b5771c | 1422 | static const struct sym_fns elf_sym_fns = |
c906108c | 1423 | { |
3e43a32a MS |
1424 | elf_new_init, /* init anything gbl to entire symtab */ |
1425 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1426 | elf_symfile_read, /* read a symbol file into symtab */ | |
1427 | elf_symfile_finish, /* finished with file, cleanup */ | |
1428 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1429 | elf_symfile_segments, /* Get segment information from a file. */ | |
1430 | NULL, | |
1431 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1432 | &elf_probe_fns, /* sym_probe_fns */ |
927aa2e7 JK |
1433 | }; |
1434 | ||
07be84bf JK |
1435 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1436 | ||
1437 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1438 | { | |
1439 | elf_gnu_ifunc_resolve_addr, | |
1440 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1441 | elf_gnu_ifunc_resolver_stop, |
1442 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1443 | }; |
1444 | ||
6c265988 | 1445 | void _initialize_elfread (); |
c906108c | 1446 | void |
6c265988 | 1447 | _initialize_elfread () |
c906108c | 1448 | { |
c256e171 | 1449 | add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns); |
07be84bf | 1450 | |
07be84bf | 1451 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; |
c906108c | 1452 | } |