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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
213516ef | 3 | Copyright (C) 1991-2023 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 | 32 | #include "demangle.h" |
4de283e4 TT |
33 | #include "filenames.h" |
34 | #include "probe.h" | |
35 | #include "arch-utils.h" | |
07be84bf | 36 | #include "gdbtypes.h" |
4de283e4 | 37 | #include "value.h" |
07be84bf | 38 | #include "infcall.h" |
4de283e4 | 39 | #include "gdbthread.h" |
00431a78 | 40 | #include "inferior.h" |
4de283e4 TT |
41 | #include "regcache.h" |
42 | #include "bcache.h" | |
43 | #include "gdb_bfd.h" | |
44 | #include "build-id.h" | |
f00aae0f | 45 | #include "location.h" |
4de283e4 | 46 | #include "auxv.h" |
0e8f53ba | 47 | #include "mdebugread.h" |
30d1f018 | 48 | #include "ctfread.h" |
31edb802 | 49 | #include "gdbsupport/gdb_string_view.h" |
0d79cdc4 AM |
50 | #include "gdbsupport/scoped_fd.h" |
51 | #include "debuginfod-support.h" | |
70182375 | 52 | #include "dwarf2/public.h" |
0d5adb56 TV |
53 | #include "cli/cli-cmds.h" |
54 | ||
55 | /* Whether ctf should always be read, or only if no dwarf is present. */ | |
56 | static bool always_read_ctf; | |
c906108c SS |
57 | |
58 | /* The struct elfinfo is available only during ELF symbol table and | |
6426a772 | 59 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
60 | It's local to elf_symfile_read. */ |
61 | ||
c5aa993b JM |
62 | struct elfinfo |
63 | { | |
c5aa993b | 64 | asection *stabsect; /* Section pointer for .stab section */ |
c5aa993b | 65 | asection *mdebugsect; /* Section pointer for .mdebug section */ |
30d1f018 | 66 | asection *ctfsect; /* Section pointer for .ctf section */ |
c5aa993b | 67 | }; |
c906108c | 68 | |
814cf43a TT |
69 | /* Type for per-BFD data. */ |
70 | ||
71 | typedef std::vector<std::unique_ptr<probe>> elfread_data; | |
72 | ||
5d9cf8a4 | 73 | /* Per-BFD data for probe info. */ |
55aa24fb | 74 | |
08b8a139 | 75 | static const registry<bfd>::key<elfread_data> probe_key; |
55aa24fb | 76 | |
07be84bf JK |
77 | /* Minimal symbols located at the GOT entries for .plt - that is the real |
78 | pointer where the given entry will jump to. It gets updated by the real | |
79 | function address during lazy ld.so resolving in the inferior. These | |
80 | minimal symbols are indexed for <tab>-completion. */ | |
81 | ||
82 | #define SYMBOL_GOT_PLT_SUFFIX "@got.plt" | |
83 | ||
31d99776 DJ |
84 | /* Locate the segments in ABFD. */ |
85 | ||
62982abd | 86 | static symfile_segment_data_up |
31d99776 DJ |
87 | elf_symfile_segments (bfd *abfd) |
88 | { | |
89 | Elf_Internal_Phdr *phdrs, **segments; | |
90 | long phdrs_size; | |
91 | int num_phdrs, num_segments, num_sections, i; | |
92 | asection *sect; | |
31d99776 DJ |
93 | |
94 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
95 | if (phdrs_size == -1) | |
96 | return NULL; | |
97 | ||
224c3ddb | 98 | phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size); |
31d99776 DJ |
99 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); |
100 | if (num_phdrs == -1) | |
101 | return NULL; | |
102 | ||
103 | num_segments = 0; | |
8d749320 | 104 | segments = XALLOCAVEC (Elf_Internal_Phdr *, num_phdrs); |
31d99776 DJ |
105 | for (i = 0; i < num_phdrs; i++) |
106 | if (phdrs[i].p_type == PT_LOAD) | |
107 | segments[num_segments++] = &phdrs[i]; | |
108 | ||
109 | if (num_segments == 0) | |
110 | return NULL; | |
111 | ||
62982abd | 112 | symfile_segment_data_up data (new symfile_segment_data); |
68b888ff | 113 | data->segments.reserve (num_segments); |
31d99776 DJ |
114 | |
115 | for (i = 0; i < num_segments; i++) | |
68b888ff | 116 | data->segments.emplace_back (segments[i]->p_vaddr, segments[i]->p_memsz); |
31d99776 DJ |
117 | |
118 | num_sections = bfd_count_sections (abfd); | |
9005fbbb SM |
119 | |
120 | /* All elements are initialized to 0 (map to no segment). */ | |
121 | data->segment_info.resize (num_sections); | |
31d99776 DJ |
122 | |
123 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
124 | { | |
125 | int j; | |
31d99776 | 126 | |
fd361982 | 127 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
31d99776 DJ |
128 | continue; |
129 | ||
62b74cb8 | 130 | Elf_Internal_Shdr *this_hdr = &elf_section_data (sect)->this_hdr; |
31d99776 DJ |
131 | |
132 | for (j = 0; j < num_segments; j++) | |
62b74cb8 | 133 | if (ELF_SECTION_IN_SEGMENT (this_hdr, segments[j])) |
31d99776 DJ |
134 | { |
135 | data->segment_info[i] = j + 1; | |
136 | break; | |
137 | } | |
138 | ||
ad09a548 DJ |
139 | /* We should have found a segment for every non-empty section. |
140 | If we haven't, we will not relocate this section by any | |
141 | offsets we apply to the segments. As an exception, do not | |
142 | warn about SHT_NOBITS sections; in normal ELF execution | |
143 | environments, SHT_NOBITS means zero-initialized and belongs | |
144 | in a segment, but in no-OS environments some tools (e.g. ARM | |
145 | RealView) use SHT_NOBITS for uninitialized data. Since it is | |
146 | uninitialized, it doesn't need a program header. Such | |
147 | binaries are not relocatable. */ | |
25f4c262 KS |
148 | |
149 | /* Exclude debuginfo files from this warning, too, since those | |
150 | are often not strictly compliant with the standard. See, e.g., | |
151 | ld/24717 for more discussion. */ | |
152 | if (!is_debuginfo_file (abfd) | |
153 | && bfd_section_size (sect) > 0 && j == num_segments | |
fd361982 | 154 | && (bfd_section_flags (sect) & SEC_LOAD) != 0) |
9d3ab915 KS |
155 | warning (_("Loadable section \"%s\" outside of ELF segments\n in %s"), |
156 | bfd_section_name (sect), bfd_get_filename (abfd)); | |
31d99776 DJ |
157 | } |
158 | ||
159 | return data; | |
160 | } | |
161 | ||
c906108c SS |
162 | /* We are called once per section from elf_symfile_read. We |
163 | need to examine each section we are passed, check to see | |
164 | if it is something we are interested in processing, and | |
165 | if so, stash away some access information for the section. | |
166 | ||
167 | For now we recognize the dwarf debug information sections and | |
168 | line number sections from matching their section names. The | |
169 | ELF definition is no real help here since it has no direct | |
170 | knowledge of DWARF (by design, so any debugging format can be | |
171 | used). | |
172 | ||
173 | We also recognize the ".stab" sections used by the Sun compilers | |
174 | released with Solaris 2. | |
175 | ||
176 | FIXME: The section names should not be hardwired strings (what | |
177 | should they be? I don't think most object file formats have enough | |
0963b4bd | 178 | section flags to specify what kind of debug section it is. |
c906108c SS |
179 | -kingdon). */ |
180 | ||
181 | static void | |
08f93a1a | 182 | elf_locate_sections (asection *sectp, struct elfinfo *ei) |
c906108c | 183 | { |
7ce59000 | 184 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 185 | { |
c5aa993b | 186 | ei->stabsect = sectp; |
c906108c | 187 | } |
6314a349 | 188 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 189 | { |
c5aa993b | 190 | ei->mdebugsect = sectp; |
c906108c | 191 | } |
30d1f018 WP |
192 | else if (strcmp (sectp->name, ".ctf") == 0) |
193 | { | |
194 | ei->ctfsect = sectp; | |
195 | } | |
c906108c SS |
196 | } |
197 | ||
c906108c | 198 | static struct minimal_symbol * |
8dddcb8f | 199 | record_minimal_symbol (minimal_symbol_reader &reader, |
31edb802 | 200 | gdb::string_view name, bool copy_name, |
9675da25 | 201 | unrelocated_addr address, |
f594e5e9 MC |
202 | enum minimal_symbol_type ms_type, |
203 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 204 | { |
08feed99 | 205 | struct gdbarch *gdbarch = objfile->arch (); |
5e2b427d | 206 | |
0875794a JK |
207 | if (ms_type == mst_text || ms_type == mst_file_text |
208 | || ms_type == mst_text_gnu_ifunc) | |
9675da25 TT |
209 | address |
210 | = unrelocated_addr (gdbarch_addr_bits_remove (gdbarch, | |
211 | CORE_ADDR (address))); | |
c906108c | 212 | |
44e4c775 AB |
213 | /* We only setup section information for allocatable sections. Usually |
214 | we'd only expect to find msymbols for allocatable sections, but if the | |
215 | ELF is malformed then this might not be the case. In that case don't | |
216 | create an msymbol that references an uninitialised section object. */ | |
217 | int section_index = 0; | |
dd2532ad TT |
218 | if ((bfd_section_flags (bfd_section) & SEC_ALLOC) == SEC_ALLOC |
219 | || bfd_section == bfd_abs_section_ptr) | |
98badbfd | 220 | section_index = gdb_bfd_section_index (objfile->obfd.get (), bfd_section); |
44e4c775 | 221 | |
62669649 | 222 | return reader.record_full (name, copy_name, address, ms_type, section_index); |
c906108c SS |
223 | } |
224 | ||
7f86f058 | 225 | /* Read the symbol table of an ELF file. |
c906108c | 226 | |
62553543 | 227 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
228 | symbol table contains regular, dynamic, or synthetic symbols, add all |
229 | the global function and data symbols to the minimal symbol table. | |
c906108c | 230 | |
c5aa993b JM |
231 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
232 | defined in the ELF symbol table, which can be used to locate | |
233 | the beginnings of sections from each ".o" file that was linked to | |
234 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 235 | in data structures hung off the objfile's private data. */ |
c906108c | 236 | |
6f610d07 UW |
237 | #define ST_REGULAR 0 |
238 | #define ST_DYNAMIC 1 | |
239 | #define ST_SYNTHETIC 2 | |
240 | ||
c906108c | 241 | static void |
8dddcb8f TT |
242 | elf_symtab_read (minimal_symbol_reader &reader, |
243 | struct objfile *objfile, int type, | |
04a679b8 | 244 | long number_of_symbols, asymbol **symbol_table, |
ce6c454e | 245 | bool copy_names) |
c906108c | 246 | { |
08feed99 | 247 | struct gdbarch *gdbarch = objfile->arch (); |
c906108c | 248 | asymbol *sym; |
c906108c | 249 | long i; |
c906108c SS |
250 | CORE_ADDR symaddr; |
251 | enum minimal_symbol_type ms_type; | |
18a94d75 DE |
252 | /* Name of the last file symbol. This is either a constant string or is |
253 | saved on the objfile's filename cache. */ | |
0af1e9a5 | 254 | const char *filesymname = ""; |
98badbfd | 255 | int stripped = (bfd_get_symcount (objfile->obfd.get ()) == 0); |
3e29f34a MR |
256 | int elf_make_msymbol_special_p |
257 | = gdbarch_elf_make_msymbol_special_p (gdbarch); | |
c5aa993b | 258 | |
0cc7b392 | 259 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 260 | { |
0cc7b392 DJ |
261 | sym = symbol_table[i]; |
262 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 263 | { |
0cc7b392 | 264 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 265 | that are null strings (may happen). */ |
0cc7b392 DJ |
266 | continue; |
267 | } | |
c906108c | 268 | |
28a4e64d TT |
269 | elf_symbol_type *elf_sym = (elf_symbol_type *) sym; |
270 | ||
74763737 DJ |
271 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
272 | symbols which do not correspond to objects in the symbol table, | |
273 | but have some other target-specific meaning. */ | |
98badbfd | 274 | if (bfd_is_target_special_symbol (objfile->obfd.get (), sym)) |
60c5725c DJ |
275 | { |
276 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
277 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
278 | continue; | |
279 | } | |
74763737 | 280 | |
6f610d07 | 281 | if (type == ST_DYNAMIC |
45dfa85a | 282 | && sym->section == bfd_und_section_ptr |
0cc7b392 DJ |
283 | && (sym->flags & BSF_FUNCTION)) |
284 | { | |
285 | struct minimal_symbol *msym; | |
98badbfd | 286 | bfd *abfd = objfile->obfd.get (); |
dea91a5c | 287 | asection *sect; |
0cc7b392 DJ |
288 | |
289 | /* Symbol is a reference to a function defined in | |
290 | a shared library. | |
291 | If its value is non zero then it is usually the address | |
292 | of the corresponding entry in the procedure linkage table, | |
293 | plus the desired section offset. | |
294 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 295 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
296 | for this symbol in the executable file, so we skip it. */ |
297 | symaddr = sym->value; | |
298 | if (symaddr == 0) | |
299 | continue; | |
02c75f72 UW |
300 | |
301 | /* sym->section is the undefined section. However, we want to | |
302 | record the section where the PLT stub resides with the | |
303 | minimal symbol. Search the section table for the one that | |
304 | covers the stub's address. */ | |
305 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
306 | { | |
fd361982 | 307 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
02c75f72 UW |
308 | continue; |
309 | ||
fd361982 AM |
310 | if (symaddr >= bfd_section_vma (sect) |
311 | && symaddr < bfd_section_vma (sect) | |
312 | + bfd_section_size (sect)) | |
02c75f72 UW |
313 | break; |
314 | } | |
315 | if (!sect) | |
316 | continue; | |
317 | ||
828cfa8d JB |
318 | /* On ia64-hpux, we have discovered that the system linker |
319 | adds undefined symbols with nonzero addresses that cannot | |
320 | be right (their address points inside the code of another | |
321 | function in the .text section). This creates problems | |
322 | when trying to determine which symbol corresponds to | |
323 | a given address. | |
324 | ||
325 | We try to detect those buggy symbols by checking which | |
326 | section we think they correspond to. Normally, PLT symbols | |
327 | are stored inside their own section, and the typical name | |
328 | for that section is ".plt". So, if there is a ".plt" | |
329 | section, and yet the section name of our symbol does not | |
330 | start with ".plt", we ignore that symbol. */ | |
61012eef | 331 | if (!startswith (sect->name, ".plt") |
828cfa8d JB |
332 | && bfd_get_section_by_name (abfd, ".plt") != NULL) |
333 | continue; | |
334 | ||
0cc7b392 | 335 | msym = record_minimal_symbol |
31edb802 | 336 | (reader, sym->name, copy_names, |
9675da25 TT |
337 | unrelocated_addr (symaddr), |
338 | mst_solib_trampoline, sect, objfile); | |
0cc7b392 | 339 | if (msym != NULL) |
9b807e7b MR |
340 | { |
341 | msym->filename = filesymname; | |
3e29f34a MR |
342 | if (elf_make_msymbol_special_p) |
343 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
9b807e7b | 344 | } |
0cc7b392 DJ |
345 | continue; |
346 | } | |
c906108c | 347 | |
0cc7b392 DJ |
348 | /* If it is a nonstripped executable, do not enter dynamic |
349 | symbols, as the dynamic symbol table is usually a subset | |
350 | of the main symbol table. */ | |
6f610d07 | 351 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
352 | continue; |
353 | if (sym->flags & BSF_FILE) | |
be1e3d3e | 354 | filesymname = objfile->intern (sym->name); |
0cc7b392 DJ |
355 | else if (sym->flags & BSF_SECTION_SYM) |
356 | continue; | |
bb869963 SDJ |
357 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK |
358 | | BSF_GNU_UNIQUE)) | |
0cc7b392 DJ |
359 | { |
360 | struct minimal_symbol *msym; | |
361 | ||
362 | /* Select global/local/weak symbols. Note that bfd puts abs | |
363 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
364 | interested in will have a section. */ |
365 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 366 | symaddr = sym->value + sym->section->vma; |
0cc7b392 DJ |
367 | /* For non-absolute symbols, use the type of the section |
368 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 369 | no way of figuring this out for absolute symbols. */ |
45dfa85a | 370 | if (sym->section == bfd_abs_section_ptr) |
c906108c | 371 | { |
0cc7b392 DJ |
372 | /* This is a hack to get the minimal symbol type |
373 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
374 | with special section indices for dynamic symbols. |
375 | ||
376 | NOTE: uweigand-20071112: Synthetic symbols do not | |
377 | have an ELF-private part, so do not touch those. */ | |
dea91a5c | 378 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
28a4e64d | 379 | elf_sym->internal_elf_sym.st_shndx; |
0cc7b392 DJ |
380 | |
381 | switch (shndx) | |
c906108c | 382 | { |
0cc7b392 DJ |
383 | case SHN_MIPS_TEXT: |
384 | ms_type = mst_text; | |
385 | break; | |
386 | case SHN_MIPS_DATA: | |
387 | ms_type = mst_data; | |
388 | break; | |
389 | case SHN_MIPS_ACOMMON: | |
390 | ms_type = mst_bss; | |
391 | break; | |
392 | default: | |
393 | ms_type = mst_abs; | |
394 | } | |
395 | ||
396 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 397 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
398 | if (ms_type != mst_abs) |
399 | { | |
400 | if (sym->name[0] == '.') | |
401 | continue; | |
c906108c | 402 | } |
0cc7b392 DJ |
403 | } |
404 | else if (sym->section->flags & SEC_CODE) | |
405 | { | |
bb869963 | 406 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 407 | { |
0875794a JK |
408 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
409 | ms_type = mst_text_gnu_ifunc; | |
410 | else | |
411 | ms_type = mst_text; | |
0cc7b392 | 412 | } |
90359a16 JK |
413 | /* The BSF_SYNTHETIC check is there to omit ppc64 function |
414 | descriptors mistaken for static functions starting with 'L'. | |
415 | */ | |
416 | else if ((sym->name[0] == '.' && sym->name[1] == 'L' | |
417 | && (sym->flags & BSF_SYNTHETIC) == 0) | |
0cc7b392 DJ |
418 | || ((sym->flags & BSF_LOCAL) |
419 | && sym->name[0] == '$' | |
420 | && sym->name[1] == 'L')) | |
421 | /* Looks like a compiler-generated label. Skip | |
422 | it. The assembler should be skipping these (to | |
423 | keep executables small), but apparently with | |
424 | gcc on the (deleted) delta m88k SVR4, it loses. | |
425 | So to have us check too should be harmless (but | |
426 | I encourage people to fix this in the assembler | |
427 | instead of adding checks here). */ | |
428 | continue; | |
429 | else | |
430 | { | |
431 | ms_type = mst_file_text; | |
c906108c | 432 | } |
0cc7b392 DJ |
433 | } |
434 | else if (sym->section->flags & SEC_ALLOC) | |
435 | { | |
bb869963 | 436 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 437 | { |
f50776aa PA |
438 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
439 | { | |
440 | ms_type = mst_data_gnu_ifunc; | |
441 | } | |
442 | else if (sym->section->flags & SEC_LOAD) | |
c906108c | 443 | { |
0cc7b392 | 444 | ms_type = mst_data; |
c906108c | 445 | } |
c906108c SS |
446 | else |
447 | { | |
0cc7b392 | 448 | ms_type = mst_bss; |
c906108c SS |
449 | } |
450 | } | |
0cc7b392 | 451 | else if (sym->flags & BSF_LOCAL) |
c906108c | 452 | { |
0cc7b392 DJ |
453 | if (sym->section->flags & SEC_LOAD) |
454 | { | |
455 | ms_type = mst_file_data; | |
c906108c SS |
456 | } |
457 | else | |
458 | { | |
0cc7b392 | 459 | ms_type = mst_file_bss; |
c906108c SS |
460 | } |
461 | } | |
462 | else | |
463 | { | |
0cc7b392 | 464 | ms_type = mst_unknown; |
c906108c | 465 | } |
0cc7b392 DJ |
466 | } |
467 | else | |
468 | { | |
469 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 470 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
471 | hob with actions like finding what function the PC |
472 | is in. Ignore them if they aren't text, data, or bss. */ | |
473 | /* ms_type = mst_unknown; */ | |
0963b4bd | 474 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
475 | } |
476 | msym = record_minimal_symbol | |
9675da25 | 477 | (reader, sym->name, copy_names, unrelocated_addr (symaddr), |
0cc7b392 | 478 | ms_type, sym->section, objfile); |
6f610d07 | 479 | |
0cc7b392 DJ |
480 | if (msym) |
481 | { | |
6f610d07 | 482 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an |
24c274a1 | 483 | ELF-private part. */ |
6f610d07 | 484 | if (type != ST_SYNTHETIC) |
24c274a1 AM |
485 | { |
486 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
5bbfd12d | 487 | msym->set_size (elf_sym->internal_elf_sym.st_size); |
24c274a1 | 488 | } |
dea91a5c | 489 | |
a103a963 | 490 | msym->filename = filesymname; |
3e29f34a MR |
491 | if (elf_make_msymbol_special_p) |
492 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 493 | } |
2eaf8d2a | 494 | |
715c6909 TT |
495 | /* If we see a default versioned symbol, install it under |
496 | its version-less name. */ | |
497 | if (msym != NULL) | |
498 | { | |
499 | const char *atsign = strchr (sym->name, '@'); | |
28a4e64d TT |
500 | bool is_at_symbol = atsign != nullptr && atsign > sym->name; |
501 | bool is_plt = is_at_symbol && strcmp (atsign, "@plt") == 0; | |
502 | int len = is_at_symbol ? atsign - sym->name : 0; | |
503 | ||
504 | if (is_at_symbol | |
505 | && !is_plt | |
506 | && (elf_sym->version & VERSYM_HIDDEN) == 0) | |
507 | record_minimal_symbol (reader, | |
508 | gdb::string_view (sym->name, len), | |
9675da25 TT |
509 | true, unrelocated_addr (symaddr), |
510 | ms_type, sym->section, objfile); | |
28a4e64d | 511 | else if (is_plt) |
2eaf8d2a | 512 | { |
28a4e64d TT |
513 | /* For @plt symbols, also record a trampoline to the |
514 | destination symbol. The @plt symbol will be used | |
515 | in disassembly, and the trampoline will be used | |
516 | when we are trying to find the target. */ | |
517 | if (ms_type == mst_text && type == ST_SYNTHETIC) | |
2eaf8d2a | 518 | { |
28a4e64d TT |
519 | struct minimal_symbol *mtramp; |
520 | ||
521 | mtramp = record_minimal_symbol | |
522 | (reader, gdb::string_view (sym->name, len), true, | |
9675da25 TT |
523 | unrelocated_addr (symaddr), |
524 | mst_solib_trampoline, sym->section, objfile); | |
28a4e64d TT |
525 | if (mtramp) |
526 | { | |
5bbfd12d | 527 | mtramp->set_size (msym->size()); |
28a4e64d TT |
528 | mtramp->created_by_gdb = 1; |
529 | mtramp->filename = filesymname; | |
530 | if (elf_make_msymbol_special_p) | |
531 | gdbarch_elf_make_msymbol_special (gdbarch, | |
532 | sym, mtramp); | |
533 | } | |
2eaf8d2a DJ |
534 | } |
535 | } | |
536 | } | |
c906108c | 537 | } |
c906108c SS |
538 | } |
539 | } | |
540 | ||
07be84bf JK |
541 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
542 | for later look ups of which function to call when user requests | |
543 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
544 | library defining `function' we cannot yet know while reading OBJFILE which | |
545 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
546 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
547 | ||
548 | static void | |
8dddcb8f TT |
549 | elf_rel_plt_read (minimal_symbol_reader &reader, |
550 | struct objfile *objfile, asymbol **dyn_symbol_table) | |
07be84bf | 551 | { |
98badbfd | 552 | bfd *obfd = objfile->obfd.get (); |
07be84bf | 553 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); |
02e169e2 | 554 | asection *relplt, *got_plt; |
07be84bf | 555 | bfd_size_type reloc_count, reloc; |
08feed99 | 556 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf | 557 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
df86565b | 558 | size_t ptr_size = ptr_type->length (); |
07be84bf JK |
559 | |
560 | if (objfile->separate_debug_objfile_backlink) | |
561 | return; | |
562 | ||
07be84bf JK |
563 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); |
564 | if (got_plt == NULL) | |
4b7d1f7f WN |
565 | { |
566 | /* For platforms where there is no separate .got.plt. */ | |
567 | got_plt = bfd_get_section_by_name (obfd, ".got"); | |
568 | if (got_plt == NULL) | |
569 | return; | |
570 | } | |
07be84bf | 571 | |
02e169e2 PA |
572 | /* Depending on system, we may find jump slots in a relocation |
573 | section for either .got.plt or .plt. */ | |
574 | asection *plt = bfd_get_section_by_name (obfd, ".plt"); | |
575 | int plt_elf_idx = (plt != NULL) ? elf_section_data (plt)->this_idx : -1; | |
576 | ||
577 | int got_plt_elf_idx = elf_section_data (got_plt)->this_idx; | |
578 | ||
07be84bf JK |
579 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ |
580 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
02e169e2 PA |
581 | { |
582 | const auto &this_hdr = elf_section_data (relplt)->this_hdr; | |
583 | ||
584 | if (this_hdr.sh_type == SHT_REL || this_hdr.sh_type == SHT_RELA) | |
585 | { | |
586 | if (this_hdr.sh_info == plt_elf_idx | |
587 | || this_hdr.sh_info == got_plt_elf_idx) | |
588 | break; | |
589 | } | |
590 | } | |
07be84bf JK |
591 | if (relplt == NULL) |
592 | return; | |
593 | ||
594 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
595 | return; | |
596 | ||
26fcd5d7 | 597 | std::string string_buffer; |
07be84bf | 598 | |
02e169e2 PA |
599 | /* Does ADDRESS reside in SECTION of OBFD? */ |
600 | auto within_section = [obfd] (asection *section, CORE_ADDR address) | |
601 | { | |
602 | if (section == NULL) | |
603 | return false; | |
604 | ||
fd361982 AM |
605 | return (bfd_section_vma (section) <= address |
606 | && (address < bfd_section_vma (section) | |
607 | + bfd_section_size (section))); | |
02e169e2 PA |
608 | }; |
609 | ||
07be84bf JK |
610 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; |
611 | for (reloc = 0; reloc < reloc_count; reloc++) | |
612 | { | |
22e048c9 | 613 | const char *name; |
07be84bf JK |
614 | struct minimal_symbol *msym; |
615 | CORE_ADDR address; | |
26fcd5d7 | 616 | const char *got_suffix = SYMBOL_GOT_PLT_SUFFIX; |
07be84bf | 617 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
07be84bf JK |
618 | |
619 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
07be84bf JK |
620 | address = relplt->relocation[reloc].address; |
621 | ||
02e169e2 PA |
622 | asection *msym_section; |
623 | ||
624 | /* Does the pointer reside in either the .got.plt or .plt | |
625 | sections? */ | |
626 | if (within_section (got_plt, address)) | |
627 | msym_section = got_plt; | |
628 | else if (within_section (plt, address)) | |
629 | msym_section = plt; | |
630 | else | |
07be84bf JK |
631 | continue; |
632 | ||
f50776aa PA |
633 | /* We cannot check if NAME is a reference to |
634 | mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the | |
635 | symbol is undefined and the objfile having NAME defined may | |
636 | not yet have been loaded. */ | |
07be84bf | 637 | |
26fcd5d7 TT |
638 | string_buffer.assign (name); |
639 | string_buffer.append (got_suffix, got_suffix + got_suffix_len); | |
07be84bf | 640 | |
31edb802 | 641 | msym = record_minimal_symbol (reader, string_buffer, |
9675da25 TT |
642 | true, unrelocated_addr (address), |
643 | mst_slot_got_plt, msym_section, objfile); | |
07be84bf | 644 | if (msym) |
5bbfd12d | 645 | msym->set_size (ptr_size); |
07be84bf | 646 | } |
07be84bf JK |
647 | } |
648 | ||
649 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
650 | ||
08b8a139 | 651 | static const registry<objfile>::key<htab, htab_deleter> |
8127a2fa | 652 | elf_objfile_gnu_ifunc_cache_data; |
07be84bf JK |
653 | |
654 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
655 | ||
656 | struct elf_gnu_ifunc_cache | |
657 | { | |
658 | /* This is always a function entry address, not a function descriptor. */ | |
659 | CORE_ADDR addr; | |
660 | ||
661 | char name[1]; | |
662 | }; | |
663 | ||
664 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
665 | ||
666 | static hashval_t | |
667 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
668 | { | |
9a3c8263 SM |
669 | const struct elf_gnu_ifunc_cache *a |
670 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
07be84bf JK |
671 | |
672 | return htab_hash_string (a->name); | |
673 | } | |
674 | ||
675 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
676 | ||
677 | static int | |
678 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
679 | { | |
9a3c8263 SM |
680 | const struct elf_gnu_ifunc_cache *a |
681 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
682 | const struct elf_gnu_ifunc_cache *b | |
683 | = (const struct elf_gnu_ifunc_cache *) b_voidp; | |
07be84bf JK |
684 | |
685 | return strcmp (a->name, b->name) == 0; | |
686 | } | |
687 | ||
688 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
689 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
690 | valid and therefore they were successfully recorded, return 0 otherwise. | |
691 | ||
692 | Function does not expect a duplicate entry. Use | |
693 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
694 | exists. */ | |
695 | ||
696 | static int | |
697 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
698 | { | |
7cbd4a93 | 699 | struct bound_minimal_symbol msym; |
07be84bf JK |
700 | struct objfile *objfile; |
701 | htab_t htab; | |
702 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
703 | void **slot; | |
704 | ||
705 | msym = lookup_minimal_symbol_by_pc (addr); | |
7cbd4a93 | 706 | if (msym.minsym == NULL) |
07be84bf | 707 | return 0; |
4aeddc50 | 708 | if (msym.value_address () != addr) |
07be84bf | 709 | return 0; |
e27d198c | 710 | objfile = msym.objfile; |
07be84bf JK |
711 | |
712 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
1adeb822 | 713 | resolution and it has no use for GDB. */ |
c9d95fa3 | 714 | const char *target_name = msym.minsym->linkage_name (); |
1adeb822 PA |
715 | size_t len = strlen (target_name); |
716 | ||
717 | /* Note we check the symbol's name instead of checking whether the | |
718 | symbol is in the .plt section because some systems have @plt | |
719 | symbols in the .text section. */ | |
720 | if (len > 4 && strcmp (target_name + len - 4, "@plt") == 0) | |
07be84bf JK |
721 | return 0; |
722 | ||
600b5fc2 HL |
723 | if (strcmp (target_name, "_PROCEDURE_LINKAGE_TABLE_") == 0) |
724 | return 0; | |
725 | ||
8127a2fa | 726 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); |
07be84bf JK |
727 | if (htab == NULL) |
728 | { | |
8127a2fa TT |
729 | htab = htab_create_alloc (1, elf_gnu_ifunc_cache_hash, |
730 | elf_gnu_ifunc_cache_eq, | |
731 | NULL, xcalloc, xfree); | |
732 | elf_objfile_gnu_ifunc_cache_data.set (objfile, htab); | |
07be84bf JK |
733 | } |
734 | ||
735 | entry_local.addr = addr; | |
736 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
737 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
738 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
224c3ddb SM |
739 | entry_p |
740 | = (struct elf_gnu_ifunc_cache *) obstack_finish (&objfile->objfile_obstack); | |
07be84bf JK |
741 | |
742 | slot = htab_find_slot (htab, entry_p, INSERT); | |
743 | if (*slot != NULL) | |
744 | { | |
9a3c8263 SM |
745 | struct elf_gnu_ifunc_cache *entry_found_p |
746 | = (struct elf_gnu_ifunc_cache *) *slot; | |
08feed99 | 747 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf JK |
748 | |
749 | if (entry_found_p->addr != addr) | |
750 | { | |
751 | /* This case indicates buggy inferior program, the resolved address | |
752 | should never change. */ | |
753 | ||
754 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
755 | "function_address from %s to %s"), | |
756 | name, paddress (gdbarch, entry_found_p->addr), | |
757 | paddress (gdbarch, addr)); | |
758 | } | |
759 | ||
760 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
761 | } | |
762 | *slot = entry_p; | |
763 | ||
764 | return 1; | |
765 | } | |
766 | ||
767 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
768 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
769 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
770 | ||
771 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
772 | function. */ | |
773 | ||
774 | static int | |
775 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
776 | { | |
1dc9084f MM |
777 | int found = 0; |
778 | ||
779 | /* FIXME: we only search the initial namespace. | |
780 | ||
781 | To search other namespaces, we would need to provide context, e.g. in | |
782 | form of an objfile in that namespace. */ | |
783 | gdbarch_iterate_over_objfiles_in_search_order | |
784 | (target_gdbarch (), | |
785 | [name, &addr_p, &found] (struct objfile *objfile) | |
786 | { | |
787 | htab_t htab; | |
788 | elf_gnu_ifunc_cache *entry_p; | |
789 | void **slot; | |
790 | ||
791 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); | |
792 | if (htab == NULL) | |
793 | return 0; | |
794 | ||
795 | entry_p = ((elf_gnu_ifunc_cache *) | |
796 | alloca (sizeof (*entry_p) + strlen (name))); | |
797 | strcpy (entry_p->name, name); | |
798 | ||
799 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
800 | if (slot == NULL) | |
801 | return 0; | |
802 | entry_p = (elf_gnu_ifunc_cache *) *slot; | |
803 | gdb_assert (entry_p != NULL); | |
804 | ||
805 | if (addr_p) | |
806 | *addr_p = entry_p->addr; | |
807 | ||
808 | found = 1; | |
809 | return 1; | |
810 | }, nullptr); | |
811 | ||
812 | return found; | |
07be84bf JK |
813 | } |
814 | ||
815 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
816 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
817 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
818 | ||
819 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
820 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
821 | prevent cache entries duplicates. */ | |
822 | ||
823 | static int | |
824 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
825 | { | |
826 | char *name_got_plt; | |
07be84bf | 827 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
1dc9084f | 828 | int found = 0; |
07be84bf | 829 | |
224c3ddb | 830 | name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1); |
07be84bf JK |
831 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); |
832 | ||
1dc9084f MM |
833 | /* FIXME: we only search the initial namespace. |
834 | ||
835 | To search other namespaces, we would need to provide context, e.g. in | |
836 | form of an objfile in that namespace. */ | |
837 | gdbarch_iterate_over_objfiles_in_search_order | |
838 | (target_gdbarch (), | |
839 | [name, name_got_plt, &addr_p, &found] (struct objfile *objfile) | |
840 | { | |
841 | bfd *obfd = objfile->obfd.get (); | |
842 | struct gdbarch *gdbarch = objfile->arch (); | |
843 | type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; | |
844 | size_t ptr_size = ptr_type->length (); | |
845 | CORE_ADDR pointer_address, addr; | |
846 | asection *plt; | |
847 | gdb_byte *buf = (gdb_byte *) alloca (ptr_size); | |
848 | bound_minimal_symbol msym; | |
849 | ||
850 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
851 | if (msym.minsym == NULL) | |
852 | return 0; | |
853 | if (msym.minsym->type () != mst_slot_got_plt) | |
854 | return 0; | |
855 | pointer_address = msym.value_address (); | |
856 | ||
857 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
858 | if (plt == NULL) | |
859 | return 0; | |
860 | ||
861 | if (msym.minsym->size () != ptr_size) | |
862 | return 0; | |
863 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
864 | return 0; | |
865 | addr = extract_typed_address (buf, ptr_type); | |
866 | addr = gdbarch_convert_from_func_ptr_addr | |
867 | (gdbarch, addr, current_inferior ()->top_target ()); | |
868 | addr = gdbarch_addr_bits_remove (gdbarch, addr); | |
869 | ||
870 | if (elf_gnu_ifunc_record_cache (name, addr)) | |
871 | { | |
872 | if (addr_p != NULL) | |
873 | *addr_p = addr; | |
874 | ||
875 | found = 1; | |
876 | return 1; | |
877 | } | |
878 | ||
879 | return 0; | |
880 | }, nullptr); | |
881 | ||
882 | return found; | |
07be84bf JK |
883 | } |
884 | ||
885 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
886 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
ececd218 | 887 | is not NULL) and the function returns true. It returns false otherwise. |
07be84bf JK |
888 | |
889 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
890 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
891 | ||
ececd218 | 892 | static bool |
07be84bf JK |
893 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) |
894 | { | |
895 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
ececd218 | 896 | return true; |
dea91a5c | 897 | |
07be84bf | 898 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
ececd218 | 899 | return true; |
07be84bf | 900 | |
ececd218 | 901 | return false; |
07be84bf JK |
902 | } |
903 | ||
904 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
905 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
906 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
907 | */ | |
908 | ||
909 | static CORE_ADDR | |
910 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
911 | { | |
2c02bd72 | 912 | const char *name_at_pc; |
07be84bf JK |
913 | CORE_ADDR start_at_pc, address; |
914 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
915 | struct value *function, *address_val; | |
e1b2624a AA |
916 | CORE_ADDR hwcap = 0; |
917 | struct value *hwcap_val; | |
07be84bf JK |
918 | |
919 | /* Try first any non-intrusive methods without an inferior call. */ | |
920 | ||
921 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
922 | && start_at_pc == pc) | |
923 | { | |
924 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
925 | return address; | |
926 | } | |
927 | else | |
928 | name_at_pc = NULL; | |
929 | ||
317c3ed9 | 930 | function = value::allocate (func_func_type); |
6f9c9d71 | 931 | function->set_lval (lval_memory); |
9feb2d07 | 932 | function->set_address (pc); |
07be84bf | 933 | |
e1b2624a AA |
934 | /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as |
935 | parameter. FUNCTION is the function entry address. ADDRESS may be a | |
936 | function descriptor. */ | |
07be84bf | 937 | |
82d23ca8 | 938 | target_auxv_search (AT_HWCAP, &hwcap); |
e1b2624a AA |
939 | hwcap_val = value_from_longest (builtin_type (gdbarch) |
940 | ->builtin_unsigned_long, hwcap); | |
e71585ff | 941 | address_val = call_function_by_hand (function, NULL, hwcap_val); |
07be84bf | 942 | address = value_as_address (address_val); |
328d42d8 SM |
943 | address = gdbarch_convert_from_func_ptr_addr |
944 | (gdbarch, address, current_inferior ()->top_target ()); | |
4b7d1f7f | 945 | address = gdbarch_addr_bits_remove (gdbarch, address); |
07be84bf JK |
946 | |
947 | if (name_at_pc) | |
948 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
949 | ||
950 | return address; | |
951 | } | |
952 | ||
0e30163f JK |
953 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
954 | ||
955 | static void | |
74421c0b | 956 | elf_gnu_ifunc_resolver_stop (code_breakpoint *b) |
0e30163f JK |
957 | { |
958 | struct breakpoint *b_return; | |
bd2b40ac | 959 | frame_info_ptr prev_frame = get_prev_frame (get_current_frame ()); |
0e30163f JK |
960 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); |
961 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
00431a78 | 962 | int thread_id = inferior_thread ()->global_num; |
0e30163f JK |
963 | |
964 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
965 | ||
966 | for (b_return = b->related_breakpoint; b_return != b; | |
967 | b_return = b_return->related_breakpoint) | |
968 | { | |
969 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
9dc1523b | 970 | gdb_assert (b_return->has_single_location ()); |
0e30163f JK |
971 | gdb_assert (frame_id_p (b_return->frame_id)); |
972 | ||
973 | if (b_return->thread == thread_id | |
f5951b9f | 974 | && b_return->first_loc ().requested_address == prev_pc |
a0cbd650 | 975 | && b_return->frame_id == prev_frame_id) |
0e30163f JK |
976 | break; |
977 | } | |
978 | ||
979 | if (b_return == b) | |
980 | { | |
0e30163f JK |
981 | /* No need to call find_pc_line for symbols resolving as this is only |
982 | a helper breakpointer never shown to the user. */ | |
983 | ||
51abb421 | 984 | symtab_and_line sal; |
0e30163f JK |
985 | sal.pspace = current_inferior ()->pspace; |
986 | sal.pc = prev_pc; | |
987 | sal.section = find_pc_overlay (sal.pc); | |
988 | sal.explicit_pc = 1; | |
454dafbd TT |
989 | b_return |
990 | = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
991 | prev_frame_id, | |
992 | bp_gnu_ifunc_resolver_return).release (); | |
0e30163f | 993 | |
c70a6932 JK |
994 | /* set_momentary_breakpoint invalidates PREV_FRAME. */ |
995 | prev_frame = NULL; | |
996 | ||
0e30163f JK |
997 | /* Add new b_return to the ring list b->related_breakpoint. */ |
998 | gdb_assert (b_return->related_breakpoint == b_return); | |
999 | b_return->related_breakpoint = b->related_breakpoint; | |
1000 | b->related_breakpoint = b_return; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
1005 | ||
1006 | static void | |
74421c0b | 1007 | elf_gnu_ifunc_resolver_return_stop (code_breakpoint *b) |
0e30163f | 1008 | { |
00431a78 | 1009 | thread_info *thread = inferior_thread (); |
0e30163f JK |
1010 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
1011 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
27710edb | 1012 | struct type *value_type = func_func_type->target_type (); |
00431a78 | 1013 | struct regcache *regcache = get_thread_regcache (thread); |
6a3a010b | 1014 | struct value *func_func; |
0e30163f JK |
1015 | struct value *value; |
1016 | CORE_ADDR resolved_address, resolved_pc; | |
0e30163f JK |
1017 | |
1018 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
1019 | ||
0e30163f JK |
1020 | while (b->related_breakpoint != b) |
1021 | { | |
1022 | struct breakpoint *b_next = b->related_breakpoint; | |
1023 | ||
1024 | switch (b->type) | |
1025 | { | |
1026 | case bp_gnu_ifunc_resolver: | |
1027 | break; | |
1028 | case bp_gnu_ifunc_resolver_return: | |
1029 | delete_breakpoint (b); | |
1030 | break; | |
1031 | default: | |
f34652de | 1032 | internal_error (_("handle_inferior_event: Invalid " |
0e30163f JK |
1033 | "gnu-indirect-function breakpoint type %d"), |
1034 | (int) b->type); | |
1035 | } | |
74421c0b | 1036 | b = (code_breakpoint *) b_next; |
0e30163f JK |
1037 | } |
1038 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
9dc1523b | 1039 | gdb_assert (b->has_single_location ()); |
6a3a010b | 1040 | |
317c3ed9 | 1041 | func_func = value::allocate (func_func_type); |
6f9c9d71 | 1042 | func_func->set_lval (lval_memory); |
f5951b9f | 1043 | func_func->set_address (b->first_loc ().related_address); |
6a3a010b | 1044 | |
317c3ed9 | 1045 | value = value::allocate (value_type); |
4e1d2f58 TT |
1046 | gdbarch_return_value_as_value (gdbarch, func_func, value_type, regcache, |
1047 | &value, NULL); | |
6a3a010b | 1048 | resolved_address = value_as_address (value); |
328d42d8 SM |
1049 | resolved_pc = gdbarch_convert_from_func_ptr_addr |
1050 | (gdbarch, resolved_address, current_inferior ()->top_target ()); | |
4b7d1f7f | 1051 | resolved_pc = gdbarch_addr_bits_remove (gdbarch, resolved_pc); |
0e30163f | 1052 | |
f8eba3c6 | 1053 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
709438c7 | 1054 | elf_gnu_ifunc_record_cache (b->locspec->to_string (), resolved_pc); |
0e30163f | 1055 | |
0e30163f | 1056 | b->type = bp_breakpoint; |
6c5b2ebe | 1057 | update_breakpoint_locations (b, current_program_space, |
79188d8d PA |
1058 | find_function_start_sal (resolved_pc, NULL, true), |
1059 | {}); | |
0e30163f JK |
1060 | } |
1061 | ||
2750ef27 TT |
1062 | /* A helper function for elf_symfile_read that reads the minimal |
1063 | symbols. */ | |
c906108c SS |
1064 | |
1065 | static void | |
5f6cac40 TT |
1066 | elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags, |
1067 | const struct elfinfo *ei) | |
c906108c | 1068 | { |
98badbfd | 1069 | bfd *synth_abfd, *abfd = objfile->obfd.get (); |
62553543 EZ |
1070 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1071 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1072 | asymbol *synthsyms; | |
c906108c | 1073 | |
2ab317fb SM |
1074 | symtab_create_debug_printf ("reading minimal symbols of objfile %s", |
1075 | objfile_name (objfile)); | |
45cfd468 | 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 | 1086 | { |
2ab317fb | 1087 | symtab_create_debug_printf ("minimal symbols were previously read"); |
5f6cac40 TT |
1088 | return; |
1089 | } | |
1090 | ||
d25e8719 | 1091 | minimal_symbol_reader reader (objfile); |
c906108c | 1092 | |
18a94d75 | 1093 | /* Process the normal ELF symbol table first. */ |
c906108c | 1094 | |
98badbfd | 1095 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd.get ()); |
62553543 | 1096 | if (storage_needed < 0) |
3e43a32a | 1097 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1098 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1099 | bfd_errmsg (bfd_get_error ())); |
1100 | ||
1101 | if (storage_needed > 0) | |
1102 | { | |
80c57053 JK |
1103 | /* Memory gets permanently referenced from ABFD after |
1104 | bfd_canonicalize_symtab so it must not get freed before ABFD gets. */ | |
1105 | ||
224c3ddb | 1106 | symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
98badbfd | 1107 | symcount = bfd_canonicalize_symtab (objfile->obfd.get (), symbol_table); |
62553543 EZ |
1108 | |
1109 | if (symcount < 0) | |
3e43a32a | 1110 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1111 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1112 | bfd_errmsg (bfd_get_error ())); |
1113 | ||
ce6c454e TT |
1114 | elf_symtab_read (reader, objfile, ST_REGULAR, symcount, symbol_table, |
1115 | false); | |
62553543 | 1116 | } |
c906108c SS |
1117 | |
1118 | /* Add the dynamic symbols. */ | |
1119 | ||
98badbfd | 1120 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd.get ()); |
62553543 EZ |
1121 | |
1122 | if (storage_needed > 0) | |
1123 | { | |
3f1eff0a JK |
1124 | /* Memory gets permanently referenced from ABFD after |
1125 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1126 | It happens only in the case when elf_slurp_reloc_table sees | |
1127 | asection->relocation NULL. Determining which section is asection is | |
1128 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1129 | implementation detail, though. */ | |
1130 | ||
224c3ddb | 1131 | dyn_symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
98badbfd | 1132 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd.get (), |
62553543 EZ |
1133 | dyn_symbol_table); |
1134 | ||
1135 | if (dynsymcount < 0) | |
3e43a32a | 1136 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1137 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1138 | bfd_errmsg (bfd_get_error ())); |
1139 | ||
8dddcb8f | 1140 | elf_symtab_read (reader, objfile, ST_DYNAMIC, dynsymcount, |
ce6c454e | 1141 | dyn_symbol_table, false); |
07be84bf | 1142 | |
8dddcb8f | 1143 | elf_rel_plt_read (reader, objfile, dyn_symbol_table); |
62553543 EZ |
1144 | } |
1145 | ||
63524580 JK |
1146 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1147 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1148 | ||
1149 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1150 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1151 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1152 | read the code address from .opd while it reads the .symtab section from | |
1153 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1154 | ||
1155 | With SYNTH_ABFD the .opd section will be read from the original | |
1156 | backlinked binary where it is valid. */ | |
1157 | ||
1158 | if (objfile->separate_debug_objfile_backlink) | |
98badbfd | 1159 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd.get (); |
63524580 JK |
1160 | else |
1161 | synth_abfd = abfd; | |
1162 | ||
62553543 EZ |
1163 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1164 | ||
63524580 | 1165 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1166 | dynsymcount, dyn_symbol_table, |
1167 | &synthsyms); | |
1168 | if (synthcount > 0) | |
1169 | { | |
62553543 EZ |
1170 | long i; |
1171 | ||
b22e99fd | 1172 | std::unique_ptr<asymbol *[]> |
d1e4a624 | 1173 | synth_symbol_table (new asymbol *[synthcount]); |
62553543 | 1174 | for (i = 0; i < synthcount; i++) |
9f20e3da | 1175 | synth_symbol_table[i] = synthsyms + i; |
8dddcb8f | 1176 | elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount, |
ce6c454e | 1177 | synth_symbol_table.get (), true); |
ba713918 AL |
1178 | |
1179 | xfree (synthsyms); | |
1180 | synthsyms = NULL; | |
62553543 | 1181 | } |
c906108c | 1182 | |
7134143f DJ |
1183 | /* Install any minimal symbols that have been collected as the current |
1184 | minimal symbols for this objfile. The debug readers below this point | |
1185 | should not generate new minimal symbols; if they do it's their | |
1186 | responsibility to install them. "mdebug" appears to be the only one | |
1187 | which will do this. */ | |
1188 | ||
d25e8719 | 1189 | reader.install (); |
7134143f | 1190 | |
2ab317fb | 1191 | symtab_create_debug_printf ("done reading minimal symbols"); |
2750ef27 TT |
1192 | } |
1193 | ||
d955d179 TV |
1194 | /* Dwarf-specific helper for elf_symfile_read. Return true if we managed to |
1195 | load dwarf debug info. */ | |
1196 | ||
1197 | static bool | |
1198 | elf_symfile_read_dwarf2 (struct objfile *objfile, | |
1199 | symfile_add_flags symfile_flags) | |
1200 | { | |
1201 | bool has_dwarf2 = true; | |
1202 | ||
1203 | if (dwarf2_has_info (objfile, NULL, true)) | |
1204 | dwarf2_initialize_objfile (objfile); | |
1205 | /* If the file has its own symbol tables it has no separate debug | |
1206 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1207 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
1208 | `.note.gnu.build-id'. | |
1209 | ||
1210 | .gnu_debugdata is !objfile::has_partial_symbols because it contains only | |
1211 | .symtab, not .debug_* section. But if we already added .gnu_debugdata as | |
1212 | an objfile via find_separate_debug_file_in_section there was no separate | |
1213 | debug info available. Therefore do not attempt to search for another one, | |
1214 | objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to | |
1215 | be NULL and we would possibly violate it. */ | |
1216 | ||
1217 | else if (!objfile->has_partial_symbols () | |
1218 | && objfile->separate_debug_objfile == NULL | |
1219 | && objfile->separate_debug_objfile_backlink == NULL) | |
1220 | { | |
34f997c8 | 1221 | deferred_warnings warnings; |
6647f05d AH |
1222 | |
1223 | std::string debugfile | |
34f997c8 | 1224 | = find_separate_debug_file_by_buildid (objfile, &warnings); |
d955d179 TV |
1225 | |
1226 | if (debugfile.empty ()) | |
34f997c8 | 1227 | debugfile = find_separate_debug_file_by_debuglink (objfile, &warnings); |
d955d179 TV |
1228 | |
1229 | if (!debugfile.empty ()) | |
1230 | { | |
f96328ac TT |
1231 | gdb_bfd_ref_ptr debug_bfd |
1232 | (symfile_bfd_open_no_error (debugfile.c_str ())); | |
d955d179 | 1233 | |
f96328ac TT |
1234 | if (debug_bfd != nullptr) |
1235 | symbol_file_add_separate (debug_bfd, debugfile.c_str (), | |
1236 | symfile_flags, objfile); | |
d955d179 TV |
1237 | } |
1238 | else | |
1239 | { | |
1240 | has_dwarf2 = false; | |
1241 | const struct bfd_build_id *build_id | |
1242 | = build_id_bfd_get (objfile->obfd.get ()); | |
1243 | const char *filename = bfd_get_filename (objfile->obfd.get ()); | |
1244 | ||
1245 | if (build_id != nullptr) | |
1246 | { | |
1247 | gdb::unique_xmalloc_ptr<char> symfile_path; | |
1248 | scoped_fd fd (debuginfod_debuginfo_query (build_id->data, | |
1249 | build_id->size, | |
1250 | filename, | |
1251 | &symfile_path)); | |
1252 | ||
1253 | if (fd.get () >= 0) | |
1254 | { | |
1255 | /* File successfully retrieved from server. */ | |
f96328ac TT |
1256 | gdb_bfd_ref_ptr debug_bfd |
1257 | (symfile_bfd_open_no_error (symfile_path.get ())); | |
d955d179 | 1258 | |
f96328ac TT |
1259 | if (debug_bfd != nullptr |
1260 | && build_id_verify (debug_bfd.get (), build_id->size, | |
1261 | build_id->data)) | |
d955d179 TV |
1262 | { |
1263 | symbol_file_add_separate (debug_bfd, symfile_path.get (), | |
1264 | symfile_flags, objfile); | |
1265 | has_dwarf2 = true; | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | } | |
34f997c8 AB |
1270 | /* If all the methods to collect the debuginfo failed, print the |
1271 | warnings, this is a no-op if there are no warnings. */ | |
1272 | if (debugfile.empty () && !has_dwarf2) | |
1273 | warnings.emit (); | |
d955d179 TV |
1274 | } |
1275 | ||
1276 | return has_dwarf2; | |
1277 | } | |
1278 | ||
2750ef27 TT |
1279 | /* Scan and build partial symbols for a symbol file. |
1280 | We have been initialized by a call to elf_symfile_init, which | |
1281 | currently does nothing. | |
1282 | ||
2750ef27 TT |
1283 | This function only does the minimum work necessary for letting the |
1284 | user "name" things symbolically; it does not read the entire symtab. | |
1285 | Instead, it reads the external and static symbols and puts them in partial | |
1286 | symbol tables. When more extensive information is requested of a | |
1287 | file, the corresponding partial symbol table is mutated into a full | |
1288 | fledged symbol table by going back and reading the symbols | |
1289 | for real. | |
1290 | ||
1291 | We look for sections with specific names, to tell us what debug | |
1292 | format to look for: FIXME!!! | |
1293 | ||
1294 | elfstab_build_psymtabs() handles STABS symbols; | |
1295 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1296 | ||
1297 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1298 | like a COFF symbol table, but has only the minimal information necessary | |
1299 | for linking. We process this also, and use the information to | |
1300 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1301 | capability even for files compiled without -g. */ | |
1302 | ||
1303 | static void | |
b15cc25c | 1304 | elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
2750ef27 | 1305 | { |
98badbfd | 1306 | bfd *abfd = objfile->obfd.get (); |
2750ef27 TT |
1307 | struct elfinfo ei; |
1308 | ||
2750ef27 | 1309 | memset ((char *) &ei, 0, sizeof (ei)); |
97cbe998 | 1310 | if (!(objfile->flags & OBJF_READNEVER)) |
08f93a1a TT |
1311 | { |
1312 | for (asection *sect : gdb_bfd_sections (abfd)) | |
1313 | elf_locate_sections (sect, &ei); | |
1314 | } | |
c906108c | 1315 | |
5f6cac40 TT |
1316 | elf_read_minimal_symbols (objfile, symfile_flags, &ei); |
1317 | ||
c906108c SS |
1318 | /* ELF debugging information is inserted into the psymtab in the |
1319 | order of least informative first - most informative last. Since | |
1320 | the psymtab table is searched `most recent insertion first' this | |
1321 | increases the probability that more detailed debug information | |
1322 | for a section is found. | |
1323 | ||
1324 | For instance, an object file might contain both .mdebug (XCOFF) | |
1325 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1326 | (searched last) and DWARF2 is inserted last (searched first). If | |
1327 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1328 | an included file XCOFF info is useless. */ |
c906108c SS |
1329 | |
1330 | if (ei.mdebugsect) | |
1331 | { | |
1332 | const struct ecoff_debug_swap *swap; | |
1333 | ||
1334 | /* .mdebug section, presumably holding ECOFF debugging | |
dda83cd7 | 1335 | information. */ |
c906108c SS |
1336 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1337 | if (swap) | |
d4f3574e | 1338 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1339 | } |
1340 | if (ei.stabsect) | |
1341 | { | |
1342 | asection *str_sect; | |
1343 | ||
1344 | /* Stab sections have an associated string table that looks like | |
dda83cd7 | 1345 | a separate section. */ |
c906108c SS |
1346 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1347 | ||
1348 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1349 | if (str_sect) | |
1350 | elfstab_build_psymtabs (objfile, | |
086df311 | 1351 | ei.stabsect, |
c906108c | 1352 | str_sect->filepos, |
fd361982 | 1353 | bfd_section_size (str_sect)); |
c906108c | 1354 | } |
9291a0cd | 1355 | |
0d5adb56 TV |
1356 | /* Read the CTF section only if there is no DWARF info. */ |
1357 | if (always_read_ctf && ei.ctfsect) | |
1358 | { | |
1359 | elfctf_build_psymtabs (objfile); | |
1360 | } | |
1361 | ||
d955d179 | 1362 | bool has_dwarf2 = elf_symfile_read_dwarf2 (objfile, symfile_flags); |
30d1f018 WP |
1363 | |
1364 | /* Read the CTF section only if there is no DWARF info. */ | |
0d5adb56 | 1365 | if (!always_read_ctf && !has_dwarf2 && ei.ctfsect) |
30d1f018 WP |
1366 | { |
1367 | elfctf_build_psymtabs (objfile); | |
9cce227f | 1368 | } |
62669649 KB |
1369 | |
1370 | /* Copy relocations are used by some ABIs using the ELF format, so | |
1371 | set the objfile flag indicating this fact. */ | |
1372 | objfile->object_format_has_copy_relocs = true; | |
c906108c SS |
1373 | } |
1374 | ||
c906108c SS |
1375 | /* Initialize anything that needs initializing when a completely new symbol |
1376 | file is specified (not just adding some symbols from another file, e.g. a | |
caa429d8 | 1377 | shared library). */ |
c906108c SS |
1378 | |
1379 | static void | |
fba45db2 | 1380 | elf_new_init (struct objfile *ignore) |
c906108c | 1381 | { |
c906108c SS |
1382 | } |
1383 | ||
1384 | /* Perform any local cleanups required when we are done with a particular | |
1385 | objfile. I.E, we are in the process of discarding all symbol information | |
1386 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1387 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1388 | |
1389 | static void | |
fba45db2 | 1390 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1391 | { |
c906108c SS |
1392 | } |
1393 | ||
db7a9bcd | 1394 | /* ELF specific initialization routine for reading symbols. */ |
c906108c SS |
1395 | |
1396 | static void | |
fba45db2 | 1397 | elf_symfile_init (struct objfile *objfile) |
c906108c | 1398 | { |
c906108c SS |
1399 | } |
1400 | ||
55aa24fb SDJ |
1401 | /* Implementation of `sym_get_probes', as documented in symfile.h. */ |
1402 | ||
814cf43a | 1403 | static const elfread_data & |
55aa24fb SDJ |
1404 | elf_get_probes (struct objfile *objfile) |
1405 | { | |
98badbfd | 1406 | elfread_data *probes_per_bfd = probe_key.get (objfile->obfd.get ()); |
55aa24fb | 1407 | |
aaa63a31 | 1408 | if (probes_per_bfd == NULL) |
55aa24fb | 1409 | { |
98badbfd | 1410 | probes_per_bfd = probe_key.emplace (objfile->obfd.get ()); |
55aa24fb SDJ |
1411 | |
1412 | /* Here we try to gather information about all types of probes from the | |
1413 | objfile. */ | |
935676c9 | 1414 | for (const static_probe_ops *ops : all_static_probe_ops) |
0782db84 | 1415 | ops->get_probes (probes_per_bfd, objfile); |
55aa24fb SDJ |
1416 | } |
1417 | ||
aaa63a31 | 1418 | return *probes_per_bfd; |
55aa24fb SDJ |
1419 | } |
1420 | ||
c906108c | 1421 | \f |
55aa24fb SDJ |
1422 | |
1423 | /* Implementation `sym_probe_fns', as documented in symfile.h. */ | |
1424 | ||
1425 | static const struct sym_probe_fns elf_probe_fns = | |
1426 | { | |
25f9533e | 1427 | elf_get_probes, /* sym_get_probes */ |
55aa24fb SDJ |
1428 | }; |
1429 | ||
c906108c SS |
1430 | /* Register that we are able to handle ELF object file formats. */ |
1431 | ||
00b5771c | 1432 | static const struct sym_fns elf_sym_fns = |
c906108c | 1433 | { |
3e43a32a MS |
1434 | elf_new_init, /* init anything gbl to entire symtab */ |
1435 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1436 | elf_symfile_read, /* read a symbol file into symtab */ | |
1437 | elf_symfile_finish, /* finished with file, cleanup */ | |
1438 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1439 | elf_symfile_segments, /* Get segment information from a file. */ | |
1440 | NULL, | |
1441 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1442 | &elf_probe_fns, /* sym_probe_fns */ |
927aa2e7 JK |
1443 | }; |
1444 | ||
07be84bf JK |
1445 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1446 | ||
1447 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1448 | { | |
1449 | elf_gnu_ifunc_resolve_addr, | |
1450 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1451 | elf_gnu_ifunc_resolver_stop, |
1452 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1453 | }; |
1454 | ||
6c265988 | 1455 | void _initialize_elfread (); |
c906108c | 1456 | void |
6c265988 | 1457 | _initialize_elfread () |
c906108c | 1458 | { |
c256e171 | 1459 | add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns); |
07be84bf | 1460 | |
07be84bf | 1461 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; |
0d5adb56 TV |
1462 | |
1463 | /* Add "set always-read-ctf on/off". */ | |
1464 | add_setshow_boolean_cmd ("always-read-ctf", class_support, &always_read_ctf, | |
1465 | _("\ | |
1466 | Set whether CTF is always read."), | |
1467 | _("\ | |
1468 | Show whether CTF is always read."), | |
1469 | _("\ | |
1470 | When off, CTF is only read if DWARF is not present. When on, CTF is read\ | |
1471 | regardless of whether DWARF is present."), | |
1472 | nullptr /* set_func */, nullptr /* show_func */, | |
1473 | &setlist, &showlist); | |
c906108c | 1474 | } |