Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
e2882c85 | 3 | Copyright (C) 1991-2018 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 SS |
27 | #include "elf/mips.h" |
28 | #include "symtab.h" | |
29 | #include "symfile.h" | |
30 | #include "objfiles.h" | |
31 | #include "buildsym.h" | |
32 | #include "stabsread.h" | |
33 | #include "gdb-stabs.h" | |
34 | #include "complaints.h" | |
35 | #include "demangle.h" | |
ccefe4c4 | 36 | #include "psympriv.h" |
0ba1096a | 37 | #include "filenames.h" |
55aa24fb SDJ |
38 | #include "probe.h" |
39 | #include "arch-utils.h" | |
07be84bf JK |
40 | #include "gdbtypes.h" |
41 | #include "value.h" | |
42 | #include "infcall.h" | |
0e30163f | 43 | #include "gdbthread.h" |
00431a78 | 44 | #include "inferior.h" |
0e30163f | 45 | #include "regcache.h" |
0af1e9a5 | 46 | #include "bcache.h" |
cbb099e8 | 47 | #include "gdb_bfd.h" |
dc294be5 | 48 | #include "build-id.h" |
f00aae0f | 49 | #include "location.h" |
e1b2624a | 50 | #include "auxv.h" |
c906108c | 51 | |
3c0aa29a PA |
52 | /* Forward declarations. */ |
53 | extern const struct sym_fns elf_sym_fns_gdb_index; | |
54 | extern const struct sym_fns elf_sym_fns_debug_names; | |
55 | extern const struct sym_fns elf_sym_fns_lazy_psyms; | |
56 | ||
c906108c | 57 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 58 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
59 | It's local to elf_symfile_read. */ |
60 | ||
c5aa993b JM |
61 | struct elfinfo |
62 | { | |
c5aa993b | 63 | asection *stabsect; /* Section pointer for .stab section */ |
c5aa993b JM |
64 | asection *mdebugsect; /* Section pointer for .mdebug section */ |
65 | }; | |
c906108c | 66 | |
5d9cf8a4 | 67 | /* Per-BFD data for probe info. */ |
55aa24fb | 68 | |
5d9cf8a4 | 69 | static const struct bfd_data *probe_key = NULL; |
55aa24fb | 70 | |
07be84bf JK |
71 | /* Minimal symbols located at the GOT entries for .plt - that is the real |
72 | pointer where the given entry will jump to. It gets updated by the real | |
73 | function address during lazy ld.so resolving in the inferior. These | |
74 | minimal symbols are indexed for <tab>-completion. */ | |
75 | ||
76 | #define SYMBOL_GOT_PLT_SUFFIX "@got.plt" | |
77 | ||
31d99776 DJ |
78 | /* Locate the segments in ABFD. */ |
79 | ||
80 | static struct symfile_segment_data * | |
81 | elf_symfile_segments (bfd *abfd) | |
82 | { | |
83 | Elf_Internal_Phdr *phdrs, **segments; | |
84 | long phdrs_size; | |
85 | int num_phdrs, num_segments, num_sections, i; | |
86 | asection *sect; | |
87 | struct symfile_segment_data *data; | |
88 | ||
89 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
90 | if (phdrs_size == -1) | |
91 | return NULL; | |
92 | ||
224c3ddb | 93 | phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size); |
31d99776 DJ |
94 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); |
95 | if (num_phdrs == -1) | |
96 | return NULL; | |
97 | ||
98 | num_segments = 0; | |
8d749320 | 99 | segments = XALLOCAVEC (Elf_Internal_Phdr *, num_phdrs); |
31d99776 DJ |
100 | for (i = 0; i < num_phdrs; i++) |
101 | if (phdrs[i].p_type == PT_LOAD) | |
102 | segments[num_segments++] = &phdrs[i]; | |
103 | ||
104 | if (num_segments == 0) | |
105 | return NULL; | |
106 | ||
41bf6aca | 107 | data = XCNEW (struct symfile_segment_data); |
31d99776 | 108 | data->num_segments = num_segments; |
fc270c35 TT |
109 | data->segment_bases = XCNEWVEC (CORE_ADDR, num_segments); |
110 | data->segment_sizes = XCNEWVEC (CORE_ADDR, num_segments); | |
31d99776 DJ |
111 | |
112 | for (i = 0; i < num_segments; i++) | |
113 | { | |
114 | data->segment_bases[i] = segments[i]->p_vaddr; | |
115 | data->segment_sizes[i] = segments[i]->p_memsz; | |
116 | } | |
117 | ||
118 | num_sections = bfd_count_sections (abfd); | |
fc270c35 | 119 | data->segment_info = XCNEWVEC (int, num_sections); |
31d99776 DJ |
120 | |
121 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
122 | { | |
123 | int j; | |
31d99776 DJ |
124 | |
125 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
126 | continue; | |
127 | ||
62b74cb8 | 128 | Elf_Internal_Shdr *this_hdr = &elf_section_data (sect)->this_hdr; |
31d99776 DJ |
129 | |
130 | for (j = 0; j < num_segments; j++) | |
62b74cb8 | 131 | if (ELF_SECTION_IN_SEGMENT (this_hdr, segments[j])) |
31d99776 DJ |
132 | { |
133 | data->segment_info[i] = j + 1; | |
134 | break; | |
135 | } | |
136 | ||
ad09a548 DJ |
137 | /* We should have found a segment for every non-empty section. |
138 | If we haven't, we will not relocate this section by any | |
139 | offsets we apply to the segments. As an exception, do not | |
140 | warn about SHT_NOBITS sections; in normal ELF execution | |
141 | environments, SHT_NOBITS means zero-initialized and belongs | |
142 | in a segment, but in no-OS environments some tools (e.g. ARM | |
143 | RealView) use SHT_NOBITS for uninitialized data. Since it is | |
144 | uninitialized, it doesn't need a program header. Such | |
145 | binaries are not relocatable. */ | |
146 | if (bfd_get_section_size (sect) > 0 && j == num_segments | |
147 | && (bfd_get_section_flags (abfd, sect) & SEC_LOAD) != 0) | |
28ee876a | 148 | warning (_("Loadable section \"%s\" outside of ELF segments"), |
31d99776 DJ |
149 | bfd_section_name (abfd, sect)); |
150 | } | |
151 | ||
152 | return data; | |
153 | } | |
154 | ||
c906108c SS |
155 | /* We are called once per section from elf_symfile_read. We |
156 | need to examine each section we are passed, check to see | |
157 | if it is something we are interested in processing, and | |
158 | if so, stash away some access information for the section. | |
159 | ||
160 | For now we recognize the dwarf debug information sections and | |
161 | line number sections from matching their section names. The | |
162 | ELF definition is no real help here since it has no direct | |
163 | knowledge of DWARF (by design, so any debugging format can be | |
164 | used). | |
165 | ||
166 | We also recognize the ".stab" sections used by the Sun compilers | |
167 | released with Solaris 2. | |
168 | ||
169 | FIXME: The section names should not be hardwired strings (what | |
170 | should they be? I don't think most object file formats have enough | |
0963b4bd | 171 | section flags to specify what kind of debug section it is. |
c906108c SS |
172 | -kingdon). */ |
173 | ||
174 | static void | |
12b9c64f | 175 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
c906108c | 176 | { |
52f0bd74 | 177 | struct elfinfo *ei; |
c906108c SS |
178 | |
179 | ei = (struct elfinfo *) eip; | |
7ce59000 | 180 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 181 | { |
c5aa993b | 182 | ei->stabsect = sectp; |
c906108c | 183 | } |
6314a349 | 184 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 185 | { |
c5aa993b | 186 | ei->mdebugsect = sectp; |
c906108c SS |
187 | } |
188 | } | |
189 | ||
c906108c | 190 | static struct minimal_symbol * |
8dddcb8f | 191 | record_minimal_symbol (minimal_symbol_reader &reader, |
ce6c454e | 192 | const char *name, int name_len, bool copy_name, |
04a679b8 | 193 | CORE_ADDR address, |
f594e5e9 MC |
194 | enum minimal_symbol_type ms_type, |
195 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 196 | { |
5e2b427d UW |
197 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
198 | ||
0875794a JK |
199 | if (ms_type == mst_text || ms_type == mst_file_text |
200 | || ms_type == mst_text_gnu_ifunc) | |
85ddcc70 | 201 | address = gdbarch_addr_bits_remove (gdbarch, address); |
c906108c | 202 | |
8dddcb8f TT |
203 | return reader.record_full (name, name_len, copy_name, address, |
204 | ms_type, | |
205 | gdb_bfd_section_index (objfile->obfd, | |
206 | bfd_section)); | |
c906108c SS |
207 | } |
208 | ||
7f86f058 | 209 | /* Read the symbol table of an ELF file. |
c906108c | 210 | |
62553543 | 211 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
212 | symbol table contains regular, dynamic, or synthetic symbols, add all |
213 | the global function and data symbols to the minimal symbol table. | |
c906108c | 214 | |
c5aa993b JM |
215 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
216 | defined in the ELF symbol table, which can be used to locate | |
217 | the beginnings of sections from each ".o" file that was linked to | |
218 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 219 | in data structures hung off the objfile's private data. */ |
c906108c | 220 | |
6f610d07 UW |
221 | #define ST_REGULAR 0 |
222 | #define ST_DYNAMIC 1 | |
223 | #define ST_SYNTHETIC 2 | |
224 | ||
c906108c | 225 | static void |
8dddcb8f TT |
226 | elf_symtab_read (minimal_symbol_reader &reader, |
227 | struct objfile *objfile, int type, | |
04a679b8 | 228 | long number_of_symbols, asymbol **symbol_table, |
ce6c454e | 229 | bool copy_names) |
c906108c | 230 | { |
5e2b427d | 231 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
c906108c | 232 | asymbol *sym; |
c906108c | 233 | long i; |
c906108c SS |
234 | CORE_ADDR symaddr; |
235 | enum minimal_symbol_type ms_type; | |
18a94d75 DE |
236 | /* Name of the last file symbol. This is either a constant string or is |
237 | saved on the objfile's filename cache. */ | |
0af1e9a5 | 238 | const char *filesymname = ""; |
d4f3574e | 239 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
3e29f34a MR |
240 | int elf_make_msymbol_special_p |
241 | = gdbarch_elf_make_msymbol_special_p (gdbarch); | |
c5aa993b | 242 | |
0cc7b392 | 243 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 244 | { |
0cc7b392 DJ |
245 | sym = symbol_table[i]; |
246 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 247 | { |
0cc7b392 | 248 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 249 | that are null strings (may happen). */ |
0cc7b392 DJ |
250 | continue; |
251 | } | |
c906108c | 252 | |
74763737 DJ |
253 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
254 | symbols which do not correspond to objects in the symbol table, | |
255 | but have some other target-specific meaning. */ | |
256 | if (bfd_is_target_special_symbol (objfile->obfd, sym)) | |
60c5725c DJ |
257 | { |
258 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
259 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
260 | continue; | |
261 | } | |
74763737 | 262 | |
6f610d07 | 263 | if (type == ST_DYNAMIC |
45dfa85a | 264 | && sym->section == bfd_und_section_ptr |
0cc7b392 DJ |
265 | && (sym->flags & BSF_FUNCTION)) |
266 | { | |
267 | struct minimal_symbol *msym; | |
02c75f72 | 268 | bfd *abfd = objfile->obfd; |
dea91a5c | 269 | asection *sect; |
0cc7b392 DJ |
270 | |
271 | /* Symbol is a reference to a function defined in | |
272 | a shared library. | |
273 | If its value is non zero then it is usually the address | |
274 | of the corresponding entry in the procedure linkage table, | |
275 | plus the desired section offset. | |
276 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 277 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
278 | for this symbol in the executable file, so we skip it. */ |
279 | symaddr = sym->value; | |
280 | if (symaddr == 0) | |
281 | continue; | |
02c75f72 UW |
282 | |
283 | /* sym->section is the undefined section. However, we want to | |
284 | record the section where the PLT stub resides with the | |
285 | minimal symbol. Search the section table for the one that | |
286 | covers the stub's address. */ | |
287 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
288 | { | |
289 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
290 | continue; | |
291 | ||
292 | if (symaddr >= bfd_get_section_vma (abfd, sect) | |
293 | && symaddr < bfd_get_section_vma (abfd, sect) | |
294 | + bfd_get_section_size (sect)) | |
295 | break; | |
296 | } | |
297 | if (!sect) | |
298 | continue; | |
299 | ||
828cfa8d JB |
300 | /* On ia64-hpux, we have discovered that the system linker |
301 | adds undefined symbols with nonzero addresses that cannot | |
302 | be right (their address points inside the code of another | |
303 | function in the .text section). This creates problems | |
304 | when trying to determine which symbol corresponds to | |
305 | a given address. | |
306 | ||
307 | We try to detect those buggy symbols by checking which | |
308 | section we think they correspond to. Normally, PLT symbols | |
309 | are stored inside their own section, and the typical name | |
310 | for that section is ".plt". So, if there is a ".plt" | |
311 | section, and yet the section name of our symbol does not | |
312 | start with ".plt", we ignore that symbol. */ | |
61012eef | 313 | if (!startswith (sect->name, ".plt") |
828cfa8d JB |
314 | && bfd_get_section_by_name (abfd, ".plt") != NULL) |
315 | continue; | |
316 | ||
0cc7b392 | 317 | msym = record_minimal_symbol |
8dddcb8f | 318 | (reader, sym->name, strlen (sym->name), copy_names, |
04a679b8 | 319 | symaddr, mst_solib_trampoline, sect, objfile); |
0cc7b392 | 320 | if (msym != NULL) |
9b807e7b MR |
321 | { |
322 | msym->filename = filesymname; | |
3e29f34a MR |
323 | if (elf_make_msymbol_special_p) |
324 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
9b807e7b | 325 | } |
0cc7b392 DJ |
326 | continue; |
327 | } | |
c906108c | 328 | |
0cc7b392 DJ |
329 | /* If it is a nonstripped executable, do not enter dynamic |
330 | symbols, as the dynamic symbol table is usually a subset | |
331 | of the main symbol table. */ | |
6f610d07 | 332 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
333 | continue; |
334 | if (sym->flags & BSF_FILE) | |
335 | { | |
9a3c8263 SM |
336 | filesymname |
337 | = (const char *) bcache (sym->name, strlen (sym->name) + 1, | |
338 | objfile->per_bfd->filename_cache); | |
0cc7b392 DJ |
339 | } |
340 | else if (sym->flags & BSF_SECTION_SYM) | |
341 | continue; | |
bb869963 SDJ |
342 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK |
343 | | BSF_GNU_UNIQUE)) | |
0cc7b392 DJ |
344 | { |
345 | struct minimal_symbol *msym; | |
346 | ||
347 | /* Select global/local/weak symbols. Note that bfd puts abs | |
348 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
349 | interested in will have a section. */ |
350 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 351 | symaddr = sym->value + sym->section->vma; |
0cc7b392 DJ |
352 | /* For non-absolute symbols, use the type of the section |
353 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 354 | no way of figuring this out for absolute symbols. */ |
45dfa85a | 355 | if (sym->section == bfd_abs_section_ptr) |
c906108c | 356 | { |
0cc7b392 DJ |
357 | /* This is a hack to get the minimal symbol type |
358 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
359 | with special section indices for dynamic symbols. |
360 | ||
361 | NOTE: uweigand-20071112: Synthetic symbols do not | |
362 | have an ELF-private part, so do not touch those. */ | |
dea91a5c | 363 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
0cc7b392 DJ |
364 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
365 | ||
366 | switch (shndx) | |
c906108c | 367 | { |
0cc7b392 DJ |
368 | case SHN_MIPS_TEXT: |
369 | ms_type = mst_text; | |
370 | break; | |
371 | case SHN_MIPS_DATA: | |
372 | ms_type = mst_data; | |
373 | break; | |
374 | case SHN_MIPS_ACOMMON: | |
375 | ms_type = mst_bss; | |
376 | break; | |
377 | default: | |
378 | ms_type = mst_abs; | |
379 | } | |
380 | ||
381 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 382 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
383 | if (ms_type != mst_abs) |
384 | { | |
385 | if (sym->name[0] == '.') | |
386 | continue; | |
c906108c | 387 | } |
0cc7b392 DJ |
388 | } |
389 | else if (sym->section->flags & SEC_CODE) | |
390 | { | |
bb869963 | 391 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 392 | { |
0875794a JK |
393 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
394 | ms_type = mst_text_gnu_ifunc; | |
395 | else | |
396 | ms_type = mst_text; | |
0cc7b392 | 397 | } |
90359a16 JK |
398 | /* The BSF_SYNTHETIC check is there to omit ppc64 function |
399 | descriptors mistaken for static functions starting with 'L'. | |
400 | */ | |
401 | else if ((sym->name[0] == '.' && sym->name[1] == 'L' | |
402 | && (sym->flags & BSF_SYNTHETIC) == 0) | |
0cc7b392 DJ |
403 | || ((sym->flags & BSF_LOCAL) |
404 | && sym->name[0] == '$' | |
405 | && sym->name[1] == 'L')) | |
406 | /* Looks like a compiler-generated label. Skip | |
407 | it. The assembler should be skipping these (to | |
408 | keep executables small), but apparently with | |
409 | gcc on the (deleted) delta m88k SVR4, it loses. | |
410 | So to have us check too should be harmless (but | |
411 | I encourage people to fix this in the assembler | |
412 | instead of adding checks here). */ | |
413 | continue; | |
414 | else | |
415 | { | |
416 | ms_type = mst_file_text; | |
c906108c | 417 | } |
0cc7b392 DJ |
418 | } |
419 | else if (sym->section->flags & SEC_ALLOC) | |
420 | { | |
bb869963 | 421 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 422 | { |
f50776aa PA |
423 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
424 | { | |
425 | ms_type = mst_data_gnu_ifunc; | |
426 | } | |
427 | else if (sym->section->flags & SEC_LOAD) | |
c906108c | 428 | { |
0cc7b392 | 429 | ms_type = mst_data; |
c906108c | 430 | } |
c906108c SS |
431 | else |
432 | { | |
0cc7b392 | 433 | ms_type = mst_bss; |
c906108c SS |
434 | } |
435 | } | |
0cc7b392 | 436 | else if (sym->flags & BSF_LOCAL) |
c906108c | 437 | { |
0cc7b392 DJ |
438 | if (sym->section->flags & SEC_LOAD) |
439 | { | |
440 | ms_type = mst_file_data; | |
c906108c SS |
441 | } |
442 | else | |
443 | { | |
0cc7b392 | 444 | ms_type = mst_file_bss; |
c906108c SS |
445 | } |
446 | } | |
447 | else | |
448 | { | |
0cc7b392 | 449 | ms_type = mst_unknown; |
c906108c | 450 | } |
0cc7b392 DJ |
451 | } |
452 | else | |
453 | { | |
454 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 455 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
456 | hob with actions like finding what function the PC |
457 | is in. Ignore them if they aren't text, data, or bss. */ | |
458 | /* ms_type = mst_unknown; */ | |
0963b4bd | 459 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
460 | } |
461 | msym = record_minimal_symbol | |
8dddcb8f | 462 | (reader, sym->name, strlen (sym->name), copy_names, symaddr, |
0cc7b392 | 463 | ms_type, sym->section, objfile); |
6f610d07 | 464 | |
0cc7b392 DJ |
465 | if (msym) |
466 | { | |
6f610d07 | 467 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an |
24c274a1 | 468 | ELF-private part. */ |
6f610d07 | 469 | if (type != ST_SYNTHETIC) |
24c274a1 AM |
470 | { |
471 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
472 | elf_symbol_type *elf_sym = (elf_symbol_type *) sym; | |
473 | SET_MSYMBOL_SIZE (msym, elf_sym->internal_elf_sym.st_size); | |
474 | } | |
dea91a5c | 475 | |
a103a963 | 476 | msym->filename = filesymname; |
3e29f34a MR |
477 | if (elf_make_msymbol_special_p) |
478 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 479 | } |
2eaf8d2a | 480 | |
715c6909 TT |
481 | /* If we see a default versioned symbol, install it under |
482 | its version-less name. */ | |
483 | if (msym != NULL) | |
484 | { | |
485 | const char *atsign = strchr (sym->name, '@'); | |
486 | ||
487 | if (atsign != NULL && atsign[1] == '@' && atsign > sym->name) | |
488 | { | |
489 | int len = atsign - sym->name; | |
490 | ||
ce6c454e | 491 | record_minimal_symbol (reader, sym->name, len, true, symaddr, |
715c6909 TT |
492 | ms_type, sym->section, objfile); |
493 | } | |
494 | } | |
495 | ||
2eaf8d2a DJ |
496 | /* For @plt symbols, also record a trampoline to the |
497 | destination symbol. The @plt symbol will be used in | |
498 | disassembly, and the trampoline will be used when we are | |
499 | trying to find the target. */ | |
500 | if (msym && ms_type == mst_text && type == ST_SYNTHETIC) | |
501 | { | |
502 | int len = strlen (sym->name); | |
503 | ||
504 | if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0) | |
505 | { | |
2eaf8d2a DJ |
506 | struct minimal_symbol *mtramp; |
507 | ||
ce6c454e TT |
508 | mtramp = record_minimal_symbol (reader, sym->name, len - 4, |
509 | true, symaddr, | |
2eaf8d2a DJ |
510 | mst_solib_trampoline, |
511 | sym->section, objfile); | |
512 | if (mtramp) | |
513 | { | |
d9eaeb59 | 514 | SET_MSYMBOL_SIZE (mtramp, MSYMBOL_SIZE (msym)); |
422d65e7 | 515 | mtramp->created_by_gdb = 1; |
2eaf8d2a | 516 | mtramp->filename = filesymname; |
3e29f34a MR |
517 | if (elf_make_msymbol_special_p) |
518 | gdbarch_elf_make_msymbol_special (gdbarch, | |
519 | sym, mtramp); | |
2eaf8d2a DJ |
520 | } |
521 | } | |
522 | } | |
c906108c | 523 | } |
c906108c SS |
524 | } |
525 | } | |
526 | ||
07be84bf JK |
527 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
528 | for later look ups of which function to call when user requests | |
529 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
530 | library defining `function' we cannot yet know while reading OBJFILE which | |
531 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
532 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
533 | ||
534 | static void | |
8dddcb8f TT |
535 | elf_rel_plt_read (minimal_symbol_reader &reader, |
536 | struct objfile *objfile, asymbol **dyn_symbol_table) | |
07be84bf JK |
537 | { |
538 | bfd *obfd = objfile->obfd; | |
539 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); | |
02e169e2 | 540 | asection *relplt, *got_plt; |
07be84bf | 541 | bfd_size_type reloc_count, reloc; |
df6d5441 | 542 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
543 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
544 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
545 | ||
546 | if (objfile->separate_debug_objfile_backlink) | |
547 | return; | |
548 | ||
07be84bf JK |
549 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); |
550 | if (got_plt == NULL) | |
4b7d1f7f WN |
551 | { |
552 | /* For platforms where there is no separate .got.plt. */ | |
553 | got_plt = bfd_get_section_by_name (obfd, ".got"); | |
554 | if (got_plt == NULL) | |
555 | return; | |
556 | } | |
07be84bf | 557 | |
02e169e2 PA |
558 | /* Depending on system, we may find jump slots in a relocation |
559 | section for either .got.plt or .plt. */ | |
560 | asection *plt = bfd_get_section_by_name (obfd, ".plt"); | |
561 | int plt_elf_idx = (plt != NULL) ? elf_section_data (plt)->this_idx : -1; | |
562 | ||
563 | int got_plt_elf_idx = elf_section_data (got_plt)->this_idx; | |
564 | ||
07be84bf JK |
565 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ |
566 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
02e169e2 PA |
567 | { |
568 | const auto &this_hdr = elf_section_data (relplt)->this_hdr; | |
569 | ||
570 | if (this_hdr.sh_type == SHT_REL || this_hdr.sh_type == SHT_RELA) | |
571 | { | |
572 | if (this_hdr.sh_info == plt_elf_idx | |
573 | || this_hdr.sh_info == got_plt_elf_idx) | |
574 | break; | |
575 | } | |
576 | } | |
07be84bf JK |
577 | if (relplt == NULL) |
578 | return; | |
579 | ||
580 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
581 | return; | |
582 | ||
26fcd5d7 | 583 | std::string string_buffer; |
07be84bf | 584 | |
02e169e2 PA |
585 | /* Does ADDRESS reside in SECTION of OBFD? */ |
586 | auto within_section = [obfd] (asection *section, CORE_ADDR address) | |
587 | { | |
588 | if (section == NULL) | |
589 | return false; | |
590 | ||
591 | return (bfd_get_section_vma (obfd, section) <= address | |
592 | && (address < bfd_get_section_vma (obfd, section) | |
593 | + bfd_get_section_size (section))); | |
594 | }; | |
595 | ||
07be84bf JK |
596 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; |
597 | for (reloc = 0; reloc < reloc_count; reloc++) | |
598 | { | |
22e048c9 | 599 | const char *name; |
07be84bf JK |
600 | struct minimal_symbol *msym; |
601 | CORE_ADDR address; | |
26fcd5d7 | 602 | const char *got_suffix = SYMBOL_GOT_PLT_SUFFIX; |
07be84bf | 603 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
07be84bf JK |
604 | |
605 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
07be84bf JK |
606 | address = relplt->relocation[reloc].address; |
607 | ||
02e169e2 PA |
608 | asection *msym_section; |
609 | ||
610 | /* Does the pointer reside in either the .got.plt or .plt | |
611 | sections? */ | |
612 | if (within_section (got_plt, address)) | |
613 | msym_section = got_plt; | |
614 | else if (within_section (plt, address)) | |
615 | msym_section = plt; | |
616 | else | |
07be84bf JK |
617 | continue; |
618 | ||
f50776aa PA |
619 | /* We cannot check if NAME is a reference to |
620 | mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the | |
621 | symbol is undefined and the objfile having NAME defined may | |
622 | not yet have been loaded. */ | |
07be84bf | 623 | |
26fcd5d7 TT |
624 | string_buffer.assign (name); |
625 | string_buffer.append (got_suffix, got_suffix + got_suffix_len); | |
07be84bf | 626 | |
26fcd5d7 TT |
627 | msym = record_minimal_symbol (reader, string_buffer.c_str (), |
628 | string_buffer.size (), | |
02e169e2 PA |
629 | true, address, mst_slot_got_plt, |
630 | msym_section, objfile); | |
07be84bf | 631 | if (msym) |
d9eaeb59 | 632 | SET_MSYMBOL_SIZE (msym, ptr_size); |
07be84bf | 633 | } |
07be84bf JK |
634 | } |
635 | ||
636 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
637 | ||
638 | static const struct objfile_data *elf_objfile_gnu_ifunc_cache_data; | |
639 | ||
640 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
641 | ||
642 | struct elf_gnu_ifunc_cache | |
643 | { | |
644 | /* This is always a function entry address, not a function descriptor. */ | |
645 | CORE_ADDR addr; | |
646 | ||
647 | char name[1]; | |
648 | }; | |
649 | ||
650 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
651 | ||
652 | static hashval_t | |
653 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
654 | { | |
9a3c8263 SM |
655 | const struct elf_gnu_ifunc_cache *a |
656 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
07be84bf JK |
657 | |
658 | return htab_hash_string (a->name); | |
659 | } | |
660 | ||
661 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
662 | ||
663 | static int | |
664 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
665 | { | |
9a3c8263 SM |
666 | const struct elf_gnu_ifunc_cache *a |
667 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
668 | const struct elf_gnu_ifunc_cache *b | |
669 | = (const struct elf_gnu_ifunc_cache *) b_voidp; | |
07be84bf JK |
670 | |
671 | return strcmp (a->name, b->name) == 0; | |
672 | } | |
673 | ||
674 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
675 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
676 | valid and therefore they were successfully recorded, return 0 otherwise. | |
677 | ||
678 | Function does not expect a duplicate entry. Use | |
679 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
680 | exists. */ | |
681 | ||
682 | static int | |
683 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
684 | { | |
7cbd4a93 | 685 | struct bound_minimal_symbol msym; |
07be84bf JK |
686 | struct objfile *objfile; |
687 | htab_t htab; | |
688 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
689 | void **slot; | |
690 | ||
691 | msym = lookup_minimal_symbol_by_pc (addr); | |
7cbd4a93 | 692 | if (msym.minsym == NULL) |
07be84bf | 693 | return 0; |
77e371c0 | 694 | if (BMSYMBOL_VALUE_ADDRESS (msym) != addr) |
07be84bf | 695 | return 0; |
e27d198c | 696 | objfile = msym.objfile; |
07be84bf JK |
697 | |
698 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
1adeb822 PA |
699 | resolution and it has no use for GDB. */ |
700 | const char *target_name = MSYMBOL_LINKAGE_NAME (msym.minsym); | |
701 | size_t len = strlen (target_name); | |
702 | ||
703 | /* Note we check the symbol's name instead of checking whether the | |
704 | symbol is in the .plt section because some systems have @plt | |
705 | symbols in the .text section. */ | |
706 | if (len > 4 && strcmp (target_name + len - 4, "@plt") == 0) | |
07be84bf JK |
707 | return 0; |
708 | ||
9a3c8263 | 709 | htab = (htab_t) objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data); |
07be84bf JK |
710 | if (htab == NULL) |
711 | { | |
712 | htab = htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash, | |
713 | elf_gnu_ifunc_cache_eq, | |
714 | NULL, &objfile->objfile_obstack, | |
715 | hashtab_obstack_allocate, | |
716 | dummy_obstack_deallocate); | |
717 | set_objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data, htab); | |
718 | } | |
719 | ||
720 | entry_local.addr = addr; | |
721 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
722 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
723 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
224c3ddb SM |
724 | entry_p |
725 | = (struct elf_gnu_ifunc_cache *) obstack_finish (&objfile->objfile_obstack); | |
07be84bf JK |
726 | |
727 | slot = htab_find_slot (htab, entry_p, INSERT); | |
728 | if (*slot != NULL) | |
729 | { | |
9a3c8263 SM |
730 | struct elf_gnu_ifunc_cache *entry_found_p |
731 | = (struct elf_gnu_ifunc_cache *) *slot; | |
df6d5441 | 732 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
733 | |
734 | if (entry_found_p->addr != addr) | |
735 | { | |
736 | /* This case indicates buggy inferior program, the resolved address | |
737 | should never change. */ | |
738 | ||
739 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
740 | "function_address from %s to %s"), | |
741 | name, paddress (gdbarch, entry_found_p->addr), | |
742 | paddress (gdbarch, addr)); | |
743 | } | |
744 | ||
745 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
746 | } | |
747 | *slot = entry_p; | |
748 | ||
749 | return 1; | |
750 | } | |
751 | ||
752 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
753 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
754 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
755 | ||
756 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
757 | function. */ | |
758 | ||
759 | static int | |
760 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
761 | { | |
762 | struct objfile *objfile; | |
763 | ||
764 | ALL_PSPACE_OBJFILES (current_program_space, objfile) | |
765 | { | |
766 | htab_t htab; | |
767 | struct elf_gnu_ifunc_cache *entry_p; | |
768 | void **slot; | |
769 | ||
9a3c8263 | 770 | htab = (htab_t) objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data); |
07be84bf JK |
771 | if (htab == NULL) |
772 | continue; | |
773 | ||
224c3ddb SM |
774 | entry_p = ((struct elf_gnu_ifunc_cache *) |
775 | alloca (sizeof (*entry_p) + strlen (name))); | |
07be84bf JK |
776 | strcpy (entry_p->name, name); |
777 | ||
778 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
779 | if (slot == NULL) | |
780 | continue; | |
9a3c8263 | 781 | entry_p = (struct elf_gnu_ifunc_cache *) *slot; |
07be84bf JK |
782 | gdb_assert (entry_p != NULL); |
783 | ||
784 | if (addr_p) | |
785 | *addr_p = entry_p->addr; | |
786 | return 1; | |
787 | } | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
793 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
794 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
795 | ||
796 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
797 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
798 | prevent cache entries duplicates. */ | |
799 | ||
800 | static int | |
801 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
802 | { | |
803 | char *name_got_plt; | |
804 | struct objfile *objfile; | |
805 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); | |
806 | ||
224c3ddb | 807 | name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1); |
07be84bf JK |
808 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); |
809 | ||
810 | ALL_PSPACE_OBJFILES (current_program_space, objfile) | |
811 | { | |
812 | bfd *obfd = objfile->obfd; | |
df6d5441 | 813 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
07be84bf JK |
814 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
815 | size_t ptr_size = TYPE_LENGTH (ptr_type); | |
816 | CORE_ADDR pointer_address, addr; | |
817 | asection *plt; | |
224c3ddb | 818 | gdb_byte *buf = (gdb_byte *) alloca (ptr_size); |
3b7344d5 | 819 | struct bound_minimal_symbol msym; |
07be84bf JK |
820 | |
821 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
3b7344d5 | 822 | if (msym.minsym == NULL) |
07be84bf | 823 | continue; |
3b7344d5 | 824 | if (MSYMBOL_TYPE (msym.minsym) != mst_slot_got_plt) |
07be84bf | 825 | continue; |
77e371c0 | 826 | pointer_address = BMSYMBOL_VALUE_ADDRESS (msym); |
07be84bf JK |
827 | |
828 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
829 | if (plt == NULL) | |
830 | continue; | |
831 | ||
3b7344d5 | 832 | if (MSYMBOL_SIZE (msym.minsym) != ptr_size) |
07be84bf JK |
833 | continue; |
834 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
835 | continue; | |
836 | addr = extract_typed_address (buf, ptr_type); | |
8b88a78e PA |
837 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, |
838 | current_top_target ()); | |
4b7d1f7f | 839 | addr = gdbarch_addr_bits_remove (gdbarch, addr); |
07be84bf | 840 | |
07be84bf | 841 | if (elf_gnu_ifunc_record_cache (name, addr)) |
28f4fa4d PA |
842 | { |
843 | if (addr_p != NULL) | |
844 | *addr_p = addr; | |
845 | return 1; | |
846 | } | |
07be84bf JK |
847 | } |
848 | ||
849 | return 0; | |
850 | } | |
851 | ||
852 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
853 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
854 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
855 | ||
856 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
857 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
858 | ||
859 | static int | |
860 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) | |
861 | { | |
862 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
863 | return 1; | |
dea91a5c | 864 | |
07be84bf JK |
865 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
866 | return 1; | |
867 | ||
868 | return 0; | |
869 | } | |
870 | ||
871 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
872 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
873 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
874 | */ | |
875 | ||
876 | static CORE_ADDR | |
877 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
878 | { | |
2c02bd72 | 879 | const char *name_at_pc; |
07be84bf JK |
880 | CORE_ADDR start_at_pc, address; |
881 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
882 | struct value *function, *address_val; | |
e1b2624a AA |
883 | CORE_ADDR hwcap = 0; |
884 | struct value *hwcap_val; | |
07be84bf JK |
885 | |
886 | /* Try first any non-intrusive methods without an inferior call. */ | |
887 | ||
888 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
889 | && start_at_pc == pc) | |
890 | { | |
891 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
892 | return address; | |
893 | } | |
894 | else | |
895 | name_at_pc = NULL; | |
896 | ||
897 | function = allocate_value (func_func_type); | |
1a088441 | 898 | VALUE_LVAL (function) = lval_memory; |
07be84bf JK |
899 | set_value_address (function, pc); |
900 | ||
e1b2624a AA |
901 | /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as |
902 | parameter. FUNCTION is the function entry address. ADDRESS may be a | |
903 | function descriptor. */ | |
07be84bf | 904 | |
8b88a78e | 905 | target_auxv_search (current_top_target (), AT_HWCAP, &hwcap); |
e1b2624a AA |
906 | hwcap_val = value_from_longest (builtin_type (gdbarch) |
907 | ->builtin_unsigned_long, hwcap); | |
7022349d | 908 | address_val = call_function_by_hand (function, NULL, 1, &hwcap_val); |
07be84bf | 909 | address = value_as_address (address_val); |
8b88a78e | 910 | address = gdbarch_convert_from_func_ptr_addr (gdbarch, address, current_top_target ()); |
4b7d1f7f | 911 | address = gdbarch_addr_bits_remove (gdbarch, address); |
07be84bf JK |
912 | |
913 | if (name_at_pc) | |
914 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
915 | ||
916 | return address; | |
917 | } | |
918 | ||
0e30163f JK |
919 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
920 | ||
921 | static void | |
922 | elf_gnu_ifunc_resolver_stop (struct breakpoint *b) | |
923 | { | |
924 | struct breakpoint *b_return; | |
925 | struct frame_info *prev_frame = get_prev_frame (get_current_frame ()); | |
926 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); | |
927 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
00431a78 | 928 | int thread_id = inferior_thread ()->global_num; |
0e30163f JK |
929 | |
930 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
931 | ||
932 | for (b_return = b->related_breakpoint; b_return != b; | |
933 | b_return = b_return->related_breakpoint) | |
934 | { | |
935 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
936 | gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL); | |
937 | gdb_assert (frame_id_p (b_return->frame_id)); | |
938 | ||
939 | if (b_return->thread == thread_id | |
940 | && b_return->loc->requested_address == prev_pc | |
941 | && frame_id_eq (b_return->frame_id, prev_frame_id)) | |
942 | break; | |
943 | } | |
944 | ||
945 | if (b_return == b) | |
946 | { | |
0e30163f JK |
947 | /* No need to call find_pc_line for symbols resolving as this is only |
948 | a helper breakpointer never shown to the user. */ | |
949 | ||
51abb421 | 950 | symtab_and_line sal; |
0e30163f JK |
951 | sal.pspace = current_inferior ()->pspace; |
952 | sal.pc = prev_pc; | |
953 | sal.section = find_pc_overlay (sal.pc); | |
954 | sal.explicit_pc = 1; | |
454dafbd TT |
955 | b_return |
956 | = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
957 | prev_frame_id, | |
958 | bp_gnu_ifunc_resolver_return).release (); | |
0e30163f | 959 | |
c70a6932 JK |
960 | /* set_momentary_breakpoint invalidates PREV_FRAME. */ |
961 | prev_frame = NULL; | |
962 | ||
0e30163f JK |
963 | /* Add new b_return to the ring list b->related_breakpoint. */ |
964 | gdb_assert (b_return->related_breakpoint == b_return); | |
965 | b_return->related_breakpoint = b->related_breakpoint; | |
966 | b->related_breakpoint = b_return; | |
967 | } | |
968 | } | |
969 | ||
970 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
971 | ||
972 | static void | |
973 | elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b) | |
974 | { | |
00431a78 | 975 | thread_info *thread = inferior_thread (); |
0e30163f JK |
976 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
977 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
978 | struct type *value_type = TYPE_TARGET_TYPE (func_func_type); | |
00431a78 | 979 | struct regcache *regcache = get_thread_regcache (thread); |
6a3a010b | 980 | struct value *func_func; |
0e30163f JK |
981 | struct value *value; |
982 | CORE_ADDR resolved_address, resolved_pc; | |
0e30163f JK |
983 | |
984 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
985 | ||
0e30163f JK |
986 | while (b->related_breakpoint != b) |
987 | { | |
988 | struct breakpoint *b_next = b->related_breakpoint; | |
989 | ||
990 | switch (b->type) | |
991 | { | |
992 | case bp_gnu_ifunc_resolver: | |
993 | break; | |
994 | case bp_gnu_ifunc_resolver_return: | |
995 | delete_breakpoint (b); | |
996 | break; | |
997 | default: | |
998 | internal_error (__FILE__, __LINE__, | |
999 | _("handle_inferior_event: Invalid " | |
1000 | "gnu-indirect-function breakpoint type %d"), | |
1001 | (int) b->type); | |
1002 | } | |
1003 | b = b_next; | |
1004 | } | |
1005 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
6a3a010b MR |
1006 | gdb_assert (b->loc->next == NULL); |
1007 | ||
1008 | func_func = allocate_value (func_func_type); | |
1a088441 | 1009 | VALUE_LVAL (func_func) = lval_memory; |
6a3a010b MR |
1010 | set_value_address (func_func, b->loc->related_address); |
1011 | ||
1012 | value = allocate_value (value_type); | |
1013 | gdbarch_return_value (gdbarch, func_func, value_type, regcache, | |
1014 | value_contents_raw (value), NULL); | |
1015 | resolved_address = value_as_address (value); | |
1016 | resolved_pc = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
1017 | resolved_address, | |
8b88a78e | 1018 | current_top_target ()); |
4b7d1f7f | 1019 | resolved_pc = gdbarch_addr_bits_remove (gdbarch, resolved_pc); |
0e30163f | 1020 | |
f8eba3c6 | 1021 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
d28cd78a | 1022 | elf_gnu_ifunc_record_cache (event_location_to_string (b->location.get ()), |
f00aae0f | 1023 | resolved_pc); |
0e30163f | 1024 | |
0e30163f | 1025 | b->type = bp_breakpoint; |
6c5b2ebe | 1026 | update_breakpoint_locations (b, current_program_space, |
79188d8d PA |
1027 | find_function_start_sal (resolved_pc, NULL, true), |
1028 | {}); | |
0e30163f JK |
1029 | } |
1030 | ||
2750ef27 TT |
1031 | /* A helper function for elf_symfile_read that reads the minimal |
1032 | symbols. */ | |
c906108c SS |
1033 | |
1034 | static void | |
5f6cac40 TT |
1035 | elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags, |
1036 | const struct elfinfo *ei) | |
c906108c | 1037 | { |
63524580 | 1038 | bfd *synth_abfd, *abfd = objfile->obfd; |
62553543 EZ |
1039 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1040 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1041 | asymbol *synthsyms; | |
d2f4b8fe | 1042 | struct dbx_symfile_info *dbx; |
c906108c | 1043 | |
45cfd468 DE |
1044 | if (symtab_create_debug) |
1045 | { | |
1046 | fprintf_unfiltered (gdb_stdlog, | |
1047 | "Reading minimal symbols of objfile %s ...\n", | |
4262abfb | 1048 | objfile_name (objfile)); |
45cfd468 DE |
1049 | } |
1050 | ||
5f6cac40 TT |
1051 | /* If we already have minsyms, then we can skip some work here. |
1052 | However, if there were stabs or mdebug sections, we go ahead and | |
1053 | redo all the work anyway, because the psym readers for those | |
1054 | kinds of debuginfo need extra information found here. This can | |
1055 | go away once all types of symbols are in the per-BFD object. */ | |
1056 | if (objfile->per_bfd->minsyms_read | |
1057 | && ei->stabsect == NULL | |
1058 | && ei->mdebugsect == NULL) | |
1059 | { | |
1060 | if (symtab_create_debug) | |
1061 | fprintf_unfiltered (gdb_stdlog, | |
1062 | "... minimal symbols previously read\n"); | |
1063 | return; | |
1064 | } | |
1065 | ||
d25e8719 | 1066 | minimal_symbol_reader reader (objfile); |
c906108c | 1067 | |
0963b4bd | 1068 | /* Allocate struct to keep track of the symfile. */ |
d2f4b8fe TT |
1069 | dbx = XCNEW (struct dbx_symfile_info); |
1070 | set_objfile_data (objfile, dbx_objfile_data_key, dbx); | |
c906108c | 1071 | |
18a94d75 | 1072 | /* Process the normal ELF symbol table first. */ |
c906108c | 1073 | |
62553543 EZ |
1074 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
1075 | if (storage_needed < 0) | |
3e43a32a MS |
1076 | error (_("Can't read symbols from %s: %s"), |
1077 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1078 | bfd_errmsg (bfd_get_error ())); |
1079 | ||
1080 | if (storage_needed > 0) | |
1081 | { | |
80c57053 JK |
1082 | /* Memory gets permanently referenced from ABFD after |
1083 | bfd_canonicalize_symtab so it must not get freed before ABFD gets. */ | |
1084 | ||
224c3ddb | 1085 | symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
62553543 EZ |
1086 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
1087 | ||
1088 | if (symcount < 0) | |
3e43a32a MS |
1089 | error (_("Can't read symbols from %s: %s"), |
1090 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1091 | bfd_errmsg (bfd_get_error ())); |
1092 | ||
ce6c454e TT |
1093 | elf_symtab_read (reader, objfile, ST_REGULAR, symcount, symbol_table, |
1094 | false); | |
62553543 | 1095 | } |
c906108c SS |
1096 | |
1097 | /* Add the dynamic symbols. */ | |
1098 | ||
62553543 EZ |
1099 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
1100 | ||
1101 | if (storage_needed > 0) | |
1102 | { | |
3f1eff0a JK |
1103 | /* Memory gets permanently referenced from ABFD after |
1104 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1105 | It happens only in the case when elf_slurp_reloc_table sees | |
1106 | asection->relocation NULL. Determining which section is asection is | |
1107 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1108 | implementation detail, though. */ | |
1109 | ||
224c3ddb | 1110 | dyn_symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
62553543 EZ |
1111 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
1112 | dyn_symbol_table); | |
1113 | ||
1114 | if (dynsymcount < 0) | |
3e43a32a MS |
1115 | error (_("Can't read symbols from %s: %s"), |
1116 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
1117 | bfd_errmsg (bfd_get_error ())); |
1118 | ||
8dddcb8f | 1119 | elf_symtab_read (reader, objfile, ST_DYNAMIC, dynsymcount, |
ce6c454e | 1120 | dyn_symbol_table, false); |
07be84bf | 1121 | |
8dddcb8f | 1122 | elf_rel_plt_read (reader, objfile, dyn_symbol_table); |
62553543 EZ |
1123 | } |
1124 | ||
63524580 JK |
1125 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1126 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1127 | ||
1128 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1129 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1130 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1131 | read the code address from .opd while it reads the .symtab section from | |
1132 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1133 | ||
1134 | With SYNTH_ABFD the .opd section will be read from the original | |
1135 | backlinked binary where it is valid. */ | |
1136 | ||
1137 | if (objfile->separate_debug_objfile_backlink) | |
1138 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd; | |
1139 | else | |
1140 | synth_abfd = abfd; | |
1141 | ||
62553543 EZ |
1142 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1143 | ||
63524580 | 1144 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1145 | dynsymcount, dyn_symbol_table, |
1146 | &synthsyms); | |
1147 | if (synthcount > 0) | |
1148 | { | |
62553543 EZ |
1149 | long i; |
1150 | ||
b22e99fd | 1151 | std::unique_ptr<asymbol *[]> |
d1e4a624 | 1152 | synth_symbol_table (new asymbol *[synthcount]); |
62553543 | 1153 | for (i = 0; i < synthcount; i++) |
9f20e3da | 1154 | synth_symbol_table[i] = synthsyms + i; |
8dddcb8f | 1155 | elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount, |
ce6c454e | 1156 | synth_symbol_table.get (), true); |
ba713918 AL |
1157 | |
1158 | xfree (synthsyms); | |
1159 | synthsyms = NULL; | |
62553543 | 1160 | } |
c906108c | 1161 | |
7134143f DJ |
1162 | /* Install any minimal symbols that have been collected as the current |
1163 | minimal symbols for this objfile. The debug readers below this point | |
1164 | should not generate new minimal symbols; if they do it's their | |
1165 | responsibility to install them. "mdebug" appears to be the only one | |
1166 | which will do this. */ | |
1167 | ||
d25e8719 | 1168 | reader.install (); |
7134143f | 1169 | |
4f00dda3 DE |
1170 | if (symtab_create_debug) |
1171 | fprintf_unfiltered (gdb_stdlog, "Done reading minimal symbols.\n"); | |
2750ef27 TT |
1172 | } |
1173 | ||
1174 | /* Scan and build partial symbols for a symbol file. | |
1175 | We have been initialized by a call to elf_symfile_init, which | |
1176 | currently does nothing. | |
1177 | ||
2750ef27 TT |
1178 | This function only does the minimum work necessary for letting the |
1179 | user "name" things symbolically; it does not read the entire symtab. | |
1180 | Instead, it reads the external and static symbols and puts them in partial | |
1181 | symbol tables. When more extensive information is requested of a | |
1182 | file, the corresponding partial symbol table is mutated into a full | |
1183 | fledged symbol table by going back and reading the symbols | |
1184 | for real. | |
1185 | ||
1186 | We look for sections with specific names, to tell us what debug | |
1187 | format to look for: FIXME!!! | |
1188 | ||
1189 | elfstab_build_psymtabs() handles STABS symbols; | |
1190 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1191 | ||
1192 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1193 | like a COFF symbol table, but has only the minimal information necessary | |
1194 | for linking. We process this also, and use the information to | |
1195 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1196 | capability even for files compiled without -g. */ | |
1197 | ||
1198 | static void | |
b15cc25c | 1199 | elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
2750ef27 TT |
1200 | { |
1201 | bfd *abfd = objfile->obfd; | |
1202 | struct elfinfo ei; | |
1203 | ||
2750ef27 | 1204 | memset ((char *) &ei, 0, sizeof (ei)); |
97cbe998 SDJ |
1205 | if (!(objfile->flags & OBJF_READNEVER)) |
1206 | bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); | |
c906108c | 1207 | |
5f6cac40 TT |
1208 | elf_read_minimal_symbols (objfile, symfile_flags, &ei); |
1209 | ||
c906108c SS |
1210 | /* ELF debugging information is inserted into the psymtab in the |
1211 | order of least informative first - most informative last. Since | |
1212 | the psymtab table is searched `most recent insertion first' this | |
1213 | increases the probability that more detailed debug information | |
1214 | for a section is found. | |
1215 | ||
1216 | For instance, an object file might contain both .mdebug (XCOFF) | |
1217 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1218 | (searched last) and DWARF2 is inserted last (searched first). If | |
1219 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1220 | an included file XCOFF info is useless. */ |
c906108c SS |
1221 | |
1222 | if (ei.mdebugsect) | |
1223 | { | |
1224 | const struct ecoff_debug_swap *swap; | |
1225 | ||
1226 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 1227 | information. */ |
c906108c SS |
1228 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1229 | if (swap) | |
d4f3574e | 1230 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1231 | } |
1232 | if (ei.stabsect) | |
1233 | { | |
1234 | asection *str_sect; | |
1235 | ||
1236 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 1237 | a separate section. */ |
c906108c SS |
1238 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1239 | ||
1240 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1241 | if (str_sect) | |
1242 | elfstab_build_psymtabs (objfile, | |
086df311 | 1243 | ei.stabsect, |
c906108c SS |
1244 | str_sect->filepos, |
1245 | bfd_section_size (abfd, str_sect)); | |
1246 | } | |
9291a0cd | 1247 | |
251d32d9 | 1248 | if (dwarf2_has_info (objfile, NULL)) |
b11896a5 | 1249 | { |
3c0aa29a | 1250 | dw_index_kind index_kind; |
3e03848b | 1251 | |
3c0aa29a PA |
1252 | /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF |
1253 | debug information present in OBJFILE. If there is such debug | |
1254 | info present never use an index. */ | |
1255 | if (!objfile_has_partial_symbols (objfile) | |
1256 | && dwarf2_initialize_objfile (objfile, &index_kind)) | |
1257 | { | |
1258 | switch (index_kind) | |
1259 | { | |
1260 | case dw_index_kind::GDB_INDEX: | |
1261 | objfile_set_sym_fns (objfile, &elf_sym_fns_gdb_index); | |
1262 | break; | |
1263 | case dw_index_kind::DEBUG_NAMES: | |
1264 | objfile_set_sym_fns (objfile, &elf_sym_fns_debug_names); | |
1265 | break; | |
1266 | } | |
1267 | } | |
1268 | else | |
b11896a5 TT |
1269 | { |
1270 | /* It is ok to do this even if the stabs reader made some | |
1271 | partial symbols, because OBJF_PSYMTABS_READ has not been | |
1272 | set, and so our lazy reader function will still be called | |
1273 | when needed. */ | |
8fb8eb5c | 1274 | objfile_set_sym_fns (objfile, &elf_sym_fns_lazy_psyms); |
b11896a5 TT |
1275 | } |
1276 | } | |
3e43a32a MS |
1277 | /* If the file has its own symbol tables it has no separate debug |
1278 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1279 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
8a92335b JK |
1280 | `.note.gnu.build-id'. |
1281 | ||
1282 | .gnu_debugdata is !objfile_has_partial_symbols because it contains only | |
1283 | .symtab, not .debug_* section. But if we already added .gnu_debugdata as | |
1284 | an objfile via find_separate_debug_file_in_section there was no separate | |
1285 | debug info available. Therefore do not attempt to search for another one, | |
1286 | objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to | |
1287 | be NULL and we would possibly violate it. */ | |
1288 | ||
1289 | else if (!objfile_has_partial_symbols (objfile) | |
1290 | && objfile->separate_debug_objfile == NULL | |
1291 | && objfile->separate_debug_objfile_backlink == NULL) | |
9cce227f | 1292 | { |
a8dbfd58 | 1293 | std::string debugfile = find_separate_debug_file_by_buildid (objfile); |
9cce227f | 1294 | |
a8dbfd58 SM |
1295 | if (debugfile.empty ()) |
1296 | debugfile = find_separate_debug_file_by_debuglink (objfile); | |
9cce227f | 1297 | |
a8dbfd58 | 1298 | if (!debugfile.empty ()) |
9cce227f | 1299 | { |
a8dbfd58 | 1300 | gdb_bfd_ref_ptr abfd (symfile_bfd_open (debugfile.c_str ())); |
d7f9d729 | 1301 | |
a8dbfd58 | 1302 | symbol_file_add_separate (abfd.get (), debugfile.c_str (), |
192b62ce | 1303 | symfile_flags, objfile); |
9cce227f TG |
1304 | } |
1305 | } | |
c906108c SS |
1306 | } |
1307 | ||
b11896a5 TT |
1308 | /* Callback to lazily read psymtabs. */ |
1309 | ||
1310 | static void | |
1311 | read_psyms (struct objfile *objfile) | |
1312 | { | |
251d32d9 | 1313 | if (dwarf2_has_info (objfile, NULL)) |
b11896a5 TT |
1314 | dwarf2_build_psymtabs (objfile); |
1315 | } | |
1316 | ||
c906108c SS |
1317 | /* Initialize anything that needs initializing when a completely new symbol |
1318 | file is specified (not just adding some symbols from another file, e.g. a | |
1319 | shared library). | |
1320 | ||
3e43a32a MS |
1321 | We reinitialize buildsym, since we may be reading stabs from an ELF |
1322 | file. */ | |
c906108c SS |
1323 | |
1324 | static void | |
fba45db2 | 1325 | elf_new_init (struct objfile *ignore) |
c906108c SS |
1326 | { |
1327 | stabsread_new_init (); | |
1328 | buildsym_new_init (); | |
1329 | } | |
1330 | ||
1331 | /* Perform any local cleanups required when we are done with a particular | |
1332 | objfile. I.E, we are in the process of discarding all symbol information | |
1333 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1334 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1335 | |
1336 | static void | |
fba45db2 | 1337 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1338 | { |
fe3e1990 | 1339 | dwarf2_free_objfile (objfile); |
c906108c SS |
1340 | } |
1341 | ||
db7a9bcd | 1342 | /* ELF specific initialization routine for reading symbols. */ |
c906108c SS |
1343 | |
1344 | static void | |
fba45db2 | 1345 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
1346 | { |
1347 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
1348 | find this causes a significant slowdown in gdb then we could | |
1349 | set it in the debug symbol readers only when necessary. */ | |
1350 | objfile->flags |= OBJF_REORDERED; | |
1351 | } | |
1352 | ||
55aa24fb SDJ |
1353 | /* Implementation of `sym_get_probes', as documented in symfile.h. */ |
1354 | ||
aaa63a31 | 1355 | static const std::vector<probe *> & |
55aa24fb SDJ |
1356 | elf_get_probes (struct objfile *objfile) |
1357 | { | |
aaa63a31 | 1358 | std::vector<probe *> *probes_per_bfd; |
55aa24fb SDJ |
1359 | |
1360 | /* Have we parsed this objfile's probes already? */ | |
aaa63a31 | 1361 | probes_per_bfd = (std::vector<probe *> *) bfd_data (objfile->obfd, probe_key); |
55aa24fb | 1362 | |
aaa63a31 | 1363 | if (probes_per_bfd == NULL) |
55aa24fb | 1364 | { |
aaa63a31 | 1365 | probes_per_bfd = new std::vector<probe *>; |
55aa24fb SDJ |
1366 | |
1367 | /* Here we try to gather information about all types of probes from the | |
1368 | objfile. */ | |
935676c9 | 1369 | for (const static_probe_ops *ops : all_static_probe_ops) |
0782db84 | 1370 | ops->get_probes (probes_per_bfd, objfile); |
55aa24fb | 1371 | |
5d9cf8a4 | 1372 | set_bfd_data (objfile->obfd, probe_key, probes_per_bfd); |
55aa24fb SDJ |
1373 | } |
1374 | ||
aaa63a31 | 1375 | return *probes_per_bfd; |
55aa24fb SDJ |
1376 | } |
1377 | ||
55aa24fb SDJ |
1378 | /* Helper function used to free the space allocated for storing SystemTap |
1379 | probe information. */ | |
1380 | ||
1381 | static void | |
5d9cf8a4 | 1382 | probe_key_free (bfd *abfd, void *d) |
55aa24fb | 1383 | { |
aaa63a31 | 1384 | std::vector<probe *> *probes = (std::vector<probe *> *) d; |
55aa24fb | 1385 | |
63f0e930 | 1386 | for (probe *p : *probes) |
935676c9 | 1387 | delete p; |
55aa24fb | 1388 | |
aaa63a31 | 1389 | delete probes; |
55aa24fb SDJ |
1390 | } |
1391 | ||
c906108c | 1392 | \f |
55aa24fb SDJ |
1393 | |
1394 | /* Implementation `sym_probe_fns', as documented in symfile.h. */ | |
1395 | ||
1396 | static const struct sym_probe_fns elf_probe_fns = | |
1397 | { | |
25f9533e | 1398 | elf_get_probes, /* sym_get_probes */ |
55aa24fb SDJ |
1399 | }; |
1400 | ||
c906108c SS |
1401 | /* Register that we are able to handle ELF object file formats. */ |
1402 | ||
00b5771c | 1403 | static const struct sym_fns elf_sym_fns = |
c906108c | 1404 | { |
3e43a32a MS |
1405 | elf_new_init, /* init anything gbl to entire symtab */ |
1406 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1407 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 TT |
1408 | NULL, /* sym_read_psymbols */ |
1409 | elf_symfile_finish, /* finished with file, cleanup */ | |
1410 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1411 | elf_symfile_segments, /* Get segment information from a file. */ | |
1412 | NULL, | |
1413 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1414 | &elf_probe_fns, /* sym_probe_fns */ |
b11896a5 TT |
1415 | &psym_functions |
1416 | }; | |
1417 | ||
1418 | /* The same as elf_sym_fns, but not registered and lazily reads | |
1419 | psymbols. */ | |
1420 | ||
e36122e9 | 1421 | const struct sym_fns elf_sym_fns_lazy_psyms = |
b11896a5 | 1422 | { |
b11896a5 TT |
1423 | elf_new_init, /* init anything gbl to entire symtab */ |
1424 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1425 | elf_symfile_read, /* read a symbol file into symtab */ | |
1426 | read_psyms, /* sym_read_psymbols */ | |
3e43a32a MS |
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 */ |
00b5771c | 1433 | &psym_functions |
c906108c SS |
1434 | }; |
1435 | ||
9291a0cd TT |
1436 | /* The same as elf_sym_fns, but not registered and uses the |
1437 | DWARF-specific GNU index rather than psymtab. */ | |
e36122e9 | 1438 | const struct sym_fns elf_sym_fns_gdb_index = |
9291a0cd | 1439 | { |
3e43a32a MS |
1440 | elf_new_init, /* init anything gbl to entire symab */ |
1441 | elf_symfile_init, /* read initial info, setup for sym_red() */ | |
1442 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 | 1443 | NULL, /* sym_read_psymbols */ |
3e43a32a MS |
1444 | elf_symfile_finish, /* finished with file, cleanup */ |
1445 | default_symfile_offsets, /* Translate ext. to int. relocatin */ | |
1446 | elf_symfile_segments, /* Get segment information from a file. */ | |
1447 | NULL, | |
1448 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1449 | &elf_probe_fns, /* sym_probe_fns */ |
00b5771c | 1450 | &dwarf2_gdb_index_functions |
9291a0cd TT |
1451 | }; |
1452 | ||
927aa2e7 JK |
1453 | /* The same as elf_sym_fns, but not registered and uses the |
1454 | DWARF-specific .debug_names index rather than psymtab. */ | |
1455 | const struct sym_fns elf_sym_fns_debug_names = | |
1456 | { | |
1457 | elf_new_init, /* init anything gbl to entire symab */ | |
1458 | elf_symfile_init, /* read initial info, setup for sym_red() */ | |
1459 | elf_symfile_read, /* read a symbol file into symtab */ | |
1460 | NULL, /* sym_read_psymbols */ | |
1461 | elf_symfile_finish, /* finished with file, cleanup */ | |
1462 | default_symfile_offsets, /* Translate ext. to int. relocatin */ | |
1463 | elf_symfile_segments, /* Get segment information from a file. */ | |
1464 | NULL, | |
1465 | default_symfile_relocate, /* Relocate a debug section. */ | |
1466 | &elf_probe_fns, /* sym_probe_fns */ | |
1467 | &dwarf2_debug_names_functions | |
1468 | }; | |
1469 | ||
07be84bf JK |
1470 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1471 | ||
1472 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1473 | { | |
1474 | elf_gnu_ifunc_resolve_addr, | |
1475 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1476 | elf_gnu_ifunc_resolver_stop, |
1477 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1478 | }; |
1479 | ||
c906108c | 1480 | void |
fba45db2 | 1481 | _initialize_elfread (void) |
c906108c | 1482 | { |
5d9cf8a4 | 1483 | probe_key = register_bfd_data_with_cleanup (NULL, probe_key_free); |
c256e171 | 1484 | add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns); |
07be84bf JK |
1485 | |
1486 | elf_objfile_gnu_ifunc_cache_data = register_objfile_data (); | |
1487 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; | |
c906108c | 1488 | } |