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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" | |
f00aae0f | 44 | #include "location.h" |
4de283e4 | 45 | #include "auxv.h" |
0e8f53ba | 46 | #include "mdebugread.h" |
30d1f018 | 47 | #include "ctfread.h" |
31edb802 | 48 | #include "gdbsupport/gdb_string_view.h" |
0d79cdc4 | 49 | #include "gdbsupport/scoped_fd.h" |
70182375 | 50 | #include "dwarf2/public.h" |
0d5adb56 TV |
51 | #include "cli/cli-cmds.h" |
52 | ||
53 | /* Whether ctf should always be read, or only if no dwarf is present. */ | |
54 | static bool always_read_ctf; | |
c906108c SS |
55 | |
56 | /* The struct elfinfo is available only during ELF symbol table and | |
6426a772 | 57 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
58 | It's local to elf_symfile_read. */ |
59 | ||
c5aa993b JM |
60 | struct elfinfo |
61 | { | |
c5aa993b | 62 | asection *stabsect; /* Section pointer for .stab section */ |
c5aa993b | 63 | asection *mdebugsect; /* Section pointer for .mdebug section */ |
30d1f018 | 64 | asection *ctfsect; /* Section pointer for .ctf section */ |
c5aa993b | 65 | }; |
c906108c | 66 | |
814cf43a TT |
67 | /* Type for per-BFD data. */ |
68 | ||
69 | typedef std::vector<std::unique_ptr<probe>> elfread_data; | |
70 | ||
5d9cf8a4 | 71 | /* Per-BFD data for probe info. */ |
55aa24fb | 72 | |
08b8a139 | 73 | static const registry<bfd>::key<elfread_data> probe_key; |
55aa24fb | 74 | |
07be84bf JK |
75 | /* Minimal symbols located at the GOT entries for .plt - that is the real |
76 | pointer where the given entry will jump to. It gets updated by the real | |
77 | function address during lazy ld.so resolving in the inferior. These | |
78 | minimal symbols are indexed for <tab>-completion. */ | |
79 | ||
80 | #define SYMBOL_GOT_PLT_SUFFIX "@got.plt" | |
81 | ||
31d99776 DJ |
82 | /* Locate the segments in ABFD. */ |
83 | ||
62982abd | 84 | static symfile_segment_data_up |
31d99776 DJ |
85 | elf_symfile_segments (bfd *abfd) |
86 | { | |
87 | Elf_Internal_Phdr *phdrs, **segments; | |
88 | long phdrs_size; | |
89 | int num_phdrs, num_segments, num_sections, i; | |
90 | asection *sect; | |
31d99776 DJ |
91 | |
92 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
93 | if (phdrs_size == -1) | |
94 | return NULL; | |
95 | ||
224c3ddb | 96 | phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size); |
31d99776 DJ |
97 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); |
98 | if (num_phdrs == -1) | |
99 | return NULL; | |
100 | ||
101 | num_segments = 0; | |
8d749320 | 102 | segments = XALLOCAVEC (Elf_Internal_Phdr *, num_phdrs); |
31d99776 DJ |
103 | for (i = 0; i < num_phdrs; i++) |
104 | if (phdrs[i].p_type == PT_LOAD) | |
105 | segments[num_segments++] = &phdrs[i]; | |
106 | ||
107 | if (num_segments == 0) | |
108 | return NULL; | |
109 | ||
62982abd | 110 | symfile_segment_data_up data (new symfile_segment_data); |
68b888ff | 111 | data->segments.reserve (num_segments); |
31d99776 DJ |
112 | |
113 | for (i = 0; i < num_segments; i++) | |
68b888ff | 114 | data->segments.emplace_back (segments[i]->p_vaddr, segments[i]->p_memsz); |
31d99776 DJ |
115 | |
116 | num_sections = bfd_count_sections (abfd); | |
9005fbbb SM |
117 | |
118 | /* All elements are initialized to 0 (map to no segment). */ | |
119 | data->segment_info.resize (num_sections); | |
31d99776 DJ |
120 | |
121 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
122 | { | |
123 | int j; | |
31d99776 | 124 | |
fd361982 | 125 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
31d99776 DJ |
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. */ | |
25f4c262 KS |
146 | |
147 | /* Exclude debuginfo files from this warning, too, since those | |
148 | are often not strictly compliant with the standard. See, e.g., | |
149 | ld/24717 for more discussion. */ | |
150 | if (!is_debuginfo_file (abfd) | |
151 | && bfd_section_size (sect) > 0 && j == num_segments | |
fd361982 | 152 | && (bfd_section_flags (sect) & SEC_LOAD) != 0) |
9d3ab915 KS |
153 | warning (_("Loadable section \"%s\" outside of ELF segments\n in %s"), |
154 | bfd_section_name (sect), bfd_get_filename (abfd)); | |
31d99776 DJ |
155 | } |
156 | ||
157 | return data; | |
158 | } | |
159 | ||
c906108c SS |
160 | /* We are called once per section from elf_symfile_read. We |
161 | need to examine each section we are passed, check to see | |
162 | if it is something we are interested in processing, and | |
163 | if so, stash away some access information for the section. | |
164 | ||
165 | For now we recognize the dwarf debug information sections and | |
166 | line number sections from matching their section names. The | |
167 | ELF definition is no real help here since it has no direct | |
168 | knowledge of DWARF (by design, so any debugging format can be | |
169 | used). | |
170 | ||
171 | We also recognize the ".stab" sections used by the Sun compilers | |
172 | released with Solaris 2. | |
173 | ||
174 | FIXME: The section names should not be hardwired strings (what | |
175 | should they be? I don't think most object file formats have enough | |
0963b4bd | 176 | section flags to specify what kind of debug section it is. |
c906108c SS |
177 | -kingdon). */ |
178 | ||
179 | static void | |
08f93a1a | 180 | elf_locate_sections (asection *sectp, struct elfinfo *ei) |
c906108c | 181 | { |
7ce59000 | 182 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 183 | { |
c5aa993b | 184 | ei->stabsect = sectp; |
c906108c | 185 | } |
6314a349 | 186 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 187 | { |
c5aa993b | 188 | ei->mdebugsect = sectp; |
c906108c | 189 | } |
30d1f018 WP |
190 | else if (strcmp (sectp->name, ".ctf") == 0) |
191 | { | |
192 | ei->ctfsect = sectp; | |
193 | } | |
c906108c SS |
194 | } |
195 | ||
c906108c | 196 | static struct minimal_symbol * |
8dddcb8f | 197 | record_minimal_symbol (minimal_symbol_reader &reader, |
31edb802 | 198 | gdb::string_view name, bool copy_name, |
9675da25 | 199 | unrelocated_addr address, |
f594e5e9 MC |
200 | enum minimal_symbol_type ms_type, |
201 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 202 | { |
08feed99 | 203 | struct gdbarch *gdbarch = objfile->arch (); |
5e2b427d | 204 | |
0875794a JK |
205 | if (ms_type == mst_text || ms_type == mst_file_text |
206 | || ms_type == mst_text_gnu_ifunc) | |
9675da25 TT |
207 | address |
208 | = unrelocated_addr (gdbarch_addr_bits_remove (gdbarch, | |
209 | CORE_ADDR (address))); | |
c906108c | 210 | |
44e4c775 AB |
211 | /* We only setup section information for allocatable sections. Usually |
212 | we'd only expect to find msymbols for allocatable sections, but if the | |
213 | ELF is malformed then this might not be the case. In that case don't | |
214 | create an msymbol that references an uninitialised section object. */ | |
215 | int section_index = 0; | |
dd2532ad TT |
216 | if ((bfd_section_flags (bfd_section) & SEC_ALLOC) == SEC_ALLOC |
217 | || bfd_section == bfd_abs_section_ptr) | |
98badbfd | 218 | section_index = gdb_bfd_section_index (objfile->obfd.get (), bfd_section); |
44e4c775 | 219 | |
62669649 | 220 | return reader.record_full (name, copy_name, address, ms_type, section_index); |
c906108c SS |
221 | } |
222 | ||
7f86f058 | 223 | /* Read the symbol table of an ELF file. |
c906108c | 224 | |
62553543 | 225 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
226 | symbol table contains regular, dynamic, or synthetic symbols, add all |
227 | the global function and data symbols to the minimal symbol table. | |
c906108c | 228 | |
c5aa993b JM |
229 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
230 | defined in the ELF symbol table, which can be used to locate | |
231 | the beginnings of sections from each ".o" file that was linked to | |
232 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 233 | in data structures hung off the objfile's private data. */ |
c906108c | 234 | |
6f610d07 UW |
235 | #define ST_REGULAR 0 |
236 | #define ST_DYNAMIC 1 | |
237 | #define ST_SYNTHETIC 2 | |
238 | ||
c906108c | 239 | static void |
8dddcb8f TT |
240 | elf_symtab_read (minimal_symbol_reader &reader, |
241 | struct objfile *objfile, int type, | |
04a679b8 | 242 | long number_of_symbols, asymbol **symbol_table, |
ce6c454e | 243 | bool copy_names) |
c906108c | 244 | { |
08feed99 | 245 | struct gdbarch *gdbarch = objfile->arch (); |
c906108c | 246 | asymbol *sym; |
c906108c | 247 | long i; |
c906108c SS |
248 | CORE_ADDR symaddr; |
249 | enum minimal_symbol_type ms_type; | |
18a94d75 DE |
250 | /* Name of the last file symbol. This is either a constant string or is |
251 | saved on the objfile's filename cache. */ | |
0af1e9a5 | 252 | const char *filesymname = ""; |
98badbfd | 253 | int stripped = (bfd_get_symcount (objfile->obfd.get ()) == 0); |
3e29f34a MR |
254 | int elf_make_msymbol_special_p |
255 | = gdbarch_elf_make_msymbol_special_p (gdbarch); | |
c5aa993b | 256 | |
0cc7b392 | 257 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 258 | { |
0cc7b392 DJ |
259 | sym = symbol_table[i]; |
260 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 261 | { |
0cc7b392 | 262 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 263 | that are null strings (may happen). */ |
0cc7b392 DJ |
264 | continue; |
265 | } | |
c906108c | 266 | |
28a4e64d TT |
267 | elf_symbol_type *elf_sym = (elf_symbol_type *) sym; |
268 | ||
74763737 DJ |
269 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
270 | symbols which do not correspond to objects in the symbol table, | |
271 | but have some other target-specific meaning. */ | |
98badbfd | 272 | if (bfd_is_target_special_symbol (objfile->obfd.get (), sym)) |
60c5725c DJ |
273 | { |
274 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
275 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
276 | continue; | |
277 | } | |
74763737 | 278 | |
6f610d07 | 279 | if (type == ST_DYNAMIC |
45dfa85a | 280 | && sym->section == bfd_und_section_ptr |
0cc7b392 DJ |
281 | && (sym->flags & BSF_FUNCTION)) |
282 | { | |
283 | struct minimal_symbol *msym; | |
98badbfd | 284 | bfd *abfd = objfile->obfd.get (); |
dea91a5c | 285 | asection *sect; |
0cc7b392 DJ |
286 | |
287 | /* Symbol is a reference to a function defined in | |
288 | a shared library. | |
289 | If its value is non zero then it is usually the address | |
290 | of the corresponding entry in the procedure linkage table, | |
291 | plus the desired section offset. | |
292 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 293 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
294 | for this symbol in the executable file, so we skip it. */ |
295 | symaddr = sym->value; | |
296 | if (symaddr == 0) | |
297 | continue; | |
02c75f72 UW |
298 | |
299 | /* sym->section is the undefined section. However, we want to | |
300 | record the section where the PLT stub resides with the | |
301 | minimal symbol. Search the section table for the one that | |
302 | covers the stub's address. */ | |
303 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
304 | { | |
fd361982 | 305 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
02c75f72 UW |
306 | continue; |
307 | ||
fd361982 AM |
308 | if (symaddr >= bfd_section_vma (sect) |
309 | && symaddr < bfd_section_vma (sect) | |
310 | + bfd_section_size (sect)) | |
02c75f72 UW |
311 | break; |
312 | } | |
313 | if (!sect) | |
314 | continue; | |
315 | ||
828cfa8d JB |
316 | /* On ia64-hpux, we have discovered that the system linker |
317 | adds undefined symbols with nonzero addresses that cannot | |
318 | be right (their address points inside the code of another | |
319 | function in the .text section). This creates problems | |
320 | when trying to determine which symbol corresponds to | |
321 | a given address. | |
322 | ||
323 | We try to detect those buggy symbols by checking which | |
324 | section we think they correspond to. Normally, PLT symbols | |
325 | are stored inside their own section, and the typical name | |
326 | for that section is ".plt". So, if there is a ".plt" | |
327 | section, and yet the section name of our symbol does not | |
328 | start with ".plt", we ignore that symbol. */ | |
61012eef | 329 | if (!startswith (sect->name, ".plt") |
828cfa8d JB |
330 | && bfd_get_section_by_name (abfd, ".plt") != NULL) |
331 | continue; | |
332 | ||
0cc7b392 | 333 | msym = record_minimal_symbol |
31edb802 | 334 | (reader, sym->name, copy_names, |
9675da25 TT |
335 | unrelocated_addr (symaddr), |
336 | mst_solib_trampoline, sect, objfile); | |
0cc7b392 | 337 | if (msym != NULL) |
9b807e7b MR |
338 | { |
339 | msym->filename = filesymname; | |
3e29f34a MR |
340 | if (elf_make_msymbol_special_p) |
341 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
9b807e7b | 342 | } |
0cc7b392 DJ |
343 | continue; |
344 | } | |
c906108c | 345 | |
0cc7b392 DJ |
346 | /* If it is a nonstripped executable, do not enter dynamic |
347 | symbols, as the dynamic symbol table is usually a subset | |
348 | of the main symbol table. */ | |
6f610d07 | 349 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
350 | continue; |
351 | if (sym->flags & BSF_FILE) | |
be1e3d3e | 352 | filesymname = objfile->intern (sym->name); |
0cc7b392 DJ |
353 | else if (sym->flags & BSF_SECTION_SYM) |
354 | continue; | |
bb869963 SDJ |
355 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK |
356 | | BSF_GNU_UNIQUE)) | |
0cc7b392 DJ |
357 | { |
358 | struct minimal_symbol *msym; | |
359 | ||
360 | /* Select global/local/weak symbols. Note that bfd puts abs | |
361 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
362 | interested in will have a section. */ |
363 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 364 | symaddr = sym->value + sym->section->vma; |
0cc7b392 DJ |
365 | /* For non-absolute symbols, use the type of the section |
366 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 367 | no way of figuring this out for absolute symbols. */ |
45dfa85a | 368 | if (sym->section == bfd_abs_section_ptr) |
c906108c | 369 | { |
0cc7b392 DJ |
370 | /* This is a hack to get the minimal symbol type |
371 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
372 | with special section indices for dynamic symbols. |
373 | ||
374 | NOTE: uweigand-20071112: Synthetic symbols do not | |
375 | have an ELF-private part, so do not touch those. */ | |
dea91a5c | 376 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
28a4e64d | 377 | elf_sym->internal_elf_sym.st_shndx; |
0cc7b392 DJ |
378 | |
379 | switch (shndx) | |
c906108c | 380 | { |
0cc7b392 DJ |
381 | case SHN_MIPS_TEXT: |
382 | ms_type = mst_text; | |
383 | break; | |
384 | case SHN_MIPS_DATA: | |
385 | ms_type = mst_data; | |
386 | break; | |
387 | case SHN_MIPS_ACOMMON: | |
388 | ms_type = mst_bss; | |
389 | break; | |
390 | default: | |
391 | ms_type = mst_abs; | |
392 | } | |
393 | ||
394 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 395 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
396 | if (ms_type != mst_abs) |
397 | { | |
398 | if (sym->name[0] == '.') | |
399 | continue; | |
c906108c | 400 | } |
0cc7b392 DJ |
401 | } |
402 | else if (sym->section->flags & SEC_CODE) | |
403 | { | |
bb869963 | 404 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 405 | { |
0875794a JK |
406 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
407 | ms_type = mst_text_gnu_ifunc; | |
408 | else | |
409 | ms_type = mst_text; | |
0cc7b392 | 410 | } |
90359a16 JK |
411 | /* The BSF_SYNTHETIC check is there to omit ppc64 function |
412 | descriptors mistaken for static functions starting with 'L'. | |
413 | */ | |
414 | else if ((sym->name[0] == '.' && sym->name[1] == 'L' | |
415 | && (sym->flags & BSF_SYNTHETIC) == 0) | |
0cc7b392 DJ |
416 | || ((sym->flags & BSF_LOCAL) |
417 | && sym->name[0] == '$' | |
418 | && sym->name[1] == 'L')) | |
419 | /* Looks like a compiler-generated label. Skip | |
420 | it. The assembler should be skipping these (to | |
421 | keep executables small), but apparently with | |
422 | gcc on the (deleted) delta m88k SVR4, it loses. | |
423 | So to have us check too should be harmless (but | |
424 | I encourage people to fix this in the assembler | |
425 | instead of adding checks here). */ | |
426 | continue; | |
427 | else | |
428 | { | |
429 | ms_type = mst_file_text; | |
c906108c | 430 | } |
0cc7b392 DJ |
431 | } |
432 | else if (sym->section->flags & SEC_ALLOC) | |
433 | { | |
bb869963 | 434 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 435 | { |
f50776aa PA |
436 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
437 | { | |
438 | ms_type = mst_data_gnu_ifunc; | |
439 | } | |
440 | else if (sym->section->flags & SEC_LOAD) | |
c906108c | 441 | { |
0cc7b392 | 442 | ms_type = mst_data; |
c906108c | 443 | } |
c906108c SS |
444 | else |
445 | { | |
0cc7b392 | 446 | ms_type = mst_bss; |
c906108c SS |
447 | } |
448 | } | |
0cc7b392 | 449 | else if (sym->flags & BSF_LOCAL) |
c906108c | 450 | { |
0cc7b392 DJ |
451 | if (sym->section->flags & SEC_LOAD) |
452 | { | |
453 | ms_type = mst_file_data; | |
c906108c SS |
454 | } |
455 | else | |
456 | { | |
0cc7b392 | 457 | ms_type = mst_file_bss; |
c906108c SS |
458 | } |
459 | } | |
460 | else | |
461 | { | |
0cc7b392 | 462 | ms_type = mst_unknown; |
c906108c | 463 | } |
0cc7b392 DJ |
464 | } |
465 | else | |
466 | { | |
467 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 468 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
469 | hob with actions like finding what function the PC |
470 | is in. Ignore them if they aren't text, data, or bss. */ | |
471 | /* ms_type = mst_unknown; */ | |
0963b4bd | 472 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
473 | } |
474 | msym = record_minimal_symbol | |
9675da25 | 475 | (reader, sym->name, copy_names, unrelocated_addr (symaddr), |
0cc7b392 | 476 | ms_type, sym->section, objfile); |
6f610d07 | 477 | |
0cc7b392 DJ |
478 | if (msym) |
479 | { | |
6f610d07 | 480 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an |
24c274a1 | 481 | ELF-private part. */ |
6f610d07 | 482 | if (type != ST_SYNTHETIC) |
24c274a1 AM |
483 | { |
484 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
5bbfd12d | 485 | msym->set_size (elf_sym->internal_elf_sym.st_size); |
24c274a1 | 486 | } |
dea91a5c | 487 | |
a103a963 | 488 | msym->filename = filesymname; |
3e29f34a MR |
489 | if (elf_make_msymbol_special_p) |
490 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 491 | } |
2eaf8d2a | 492 | |
715c6909 TT |
493 | /* If we see a default versioned symbol, install it under |
494 | its version-less name. */ | |
495 | if (msym != NULL) | |
496 | { | |
497 | const char *atsign = strchr (sym->name, '@'); | |
28a4e64d TT |
498 | bool is_at_symbol = atsign != nullptr && atsign > sym->name; |
499 | bool is_plt = is_at_symbol && strcmp (atsign, "@plt") == 0; | |
500 | int len = is_at_symbol ? atsign - sym->name : 0; | |
501 | ||
502 | if (is_at_symbol | |
503 | && !is_plt | |
504 | && (elf_sym->version & VERSYM_HIDDEN) == 0) | |
505 | record_minimal_symbol (reader, | |
506 | gdb::string_view (sym->name, len), | |
9675da25 TT |
507 | true, unrelocated_addr (symaddr), |
508 | ms_type, sym->section, objfile); | |
28a4e64d | 509 | else if (is_plt) |
2eaf8d2a | 510 | { |
28a4e64d TT |
511 | /* For @plt symbols, also record a trampoline to the |
512 | destination symbol. The @plt symbol will be used | |
513 | in disassembly, and the trampoline will be used | |
514 | when we are trying to find the target. */ | |
515 | if (ms_type == mst_text && type == ST_SYNTHETIC) | |
2eaf8d2a | 516 | { |
28a4e64d TT |
517 | struct minimal_symbol *mtramp; |
518 | ||
519 | mtramp = record_minimal_symbol | |
520 | (reader, gdb::string_view (sym->name, len), true, | |
9675da25 TT |
521 | unrelocated_addr (symaddr), |
522 | mst_solib_trampoline, sym->section, objfile); | |
28a4e64d TT |
523 | if (mtramp) |
524 | { | |
5bbfd12d | 525 | mtramp->set_size (msym->size()); |
28a4e64d TT |
526 | mtramp->created_by_gdb = 1; |
527 | mtramp->filename = filesymname; | |
528 | if (elf_make_msymbol_special_p) | |
529 | gdbarch_elf_make_msymbol_special (gdbarch, | |
530 | sym, mtramp); | |
531 | } | |
2eaf8d2a DJ |
532 | } |
533 | } | |
534 | } | |
c906108c | 535 | } |
c906108c SS |
536 | } |
537 | } | |
538 | ||
07be84bf JK |
539 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
540 | for later look ups of which function to call when user requests | |
541 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
542 | library defining `function' we cannot yet know while reading OBJFILE which | |
543 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
544 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
545 | ||
546 | static void | |
8dddcb8f TT |
547 | elf_rel_plt_read (minimal_symbol_reader &reader, |
548 | struct objfile *objfile, asymbol **dyn_symbol_table) | |
07be84bf | 549 | { |
98badbfd | 550 | bfd *obfd = objfile->obfd.get (); |
07be84bf | 551 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); |
02e169e2 | 552 | asection *relplt, *got_plt; |
07be84bf | 553 | bfd_size_type reloc_count, reloc; |
08feed99 | 554 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf | 555 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
df86565b | 556 | size_t ptr_size = ptr_type->length (); |
07be84bf JK |
557 | |
558 | if (objfile->separate_debug_objfile_backlink) | |
559 | return; | |
560 | ||
07be84bf JK |
561 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); |
562 | if (got_plt == NULL) | |
4b7d1f7f WN |
563 | { |
564 | /* For platforms where there is no separate .got.plt. */ | |
565 | got_plt = bfd_get_section_by_name (obfd, ".got"); | |
566 | if (got_plt == NULL) | |
567 | return; | |
568 | } | |
07be84bf | 569 | |
02e169e2 PA |
570 | /* Depending on system, we may find jump slots in a relocation |
571 | section for either .got.plt or .plt. */ | |
572 | asection *plt = bfd_get_section_by_name (obfd, ".plt"); | |
573 | int plt_elf_idx = (plt != NULL) ? elf_section_data (plt)->this_idx : -1; | |
574 | ||
575 | int got_plt_elf_idx = elf_section_data (got_plt)->this_idx; | |
576 | ||
07be84bf JK |
577 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ |
578 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
02e169e2 PA |
579 | { |
580 | const auto &this_hdr = elf_section_data (relplt)->this_hdr; | |
581 | ||
582 | if (this_hdr.sh_type == SHT_REL || this_hdr.sh_type == SHT_RELA) | |
583 | { | |
584 | if (this_hdr.sh_info == plt_elf_idx | |
585 | || this_hdr.sh_info == got_plt_elf_idx) | |
586 | break; | |
587 | } | |
588 | } | |
07be84bf JK |
589 | if (relplt == NULL) |
590 | return; | |
591 | ||
592 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
593 | return; | |
594 | ||
26fcd5d7 | 595 | std::string string_buffer; |
07be84bf | 596 | |
02e169e2 PA |
597 | /* Does ADDRESS reside in SECTION of OBFD? */ |
598 | auto within_section = [obfd] (asection *section, CORE_ADDR address) | |
599 | { | |
600 | if (section == NULL) | |
601 | return false; | |
602 | ||
fd361982 AM |
603 | return (bfd_section_vma (section) <= address |
604 | && (address < bfd_section_vma (section) | |
605 | + bfd_section_size (section))); | |
02e169e2 PA |
606 | }; |
607 | ||
07be84bf JK |
608 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; |
609 | for (reloc = 0; reloc < reloc_count; reloc++) | |
610 | { | |
22e048c9 | 611 | const char *name; |
07be84bf JK |
612 | struct minimal_symbol *msym; |
613 | CORE_ADDR address; | |
26fcd5d7 | 614 | const char *got_suffix = SYMBOL_GOT_PLT_SUFFIX; |
07be84bf | 615 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
07be84bf JK |
616 | |
617 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
07be84bf JK |
618 | address = relplt->relocation[reloc].address; |
619 | ||
02e169e2 PA |
620 | asection *msym_section; |
621 | ||
622 | /* Does the pointer reside in either the .got.plt or .plt | |
623 | sections? */ | |
624 | if (within_section (got_plt, address)) | |
625 | msym_section = got_plt; | |
626 | else if (within_section (plt, address)) | |
627 | msym_section = plt; | |
628 | else | |
07be84bf JK |
629 | continue; |
630 | ||
f50776aa PA |
631 | /* We cannot check if NAME is a reference to |
632 | mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the | |
633 | symbol is undefined and the objfile having NAME defined may | |
634 | not yet have been loaded. */ | |
07be84bf | 635 | |
26fcd5d7 TT |
636 | string_buffer.assign (name); |
637 | string_buffer.append (got_suffix, got_suffix + got_suffix_len); | |
07be84bf | 638 | |
31edb802 | 639 | msym = record_minimal_symbol (reader, string_buffer, |
9675da25 TT |
640 | true, unrelocated_addr (address), |
641 | mst_slot_got_plt, msym_section, objfile); | |
07be84bf | 642 | if (msym) |
5bbfd12d | 643 | msym->set_size (ptr_size); |
07be84bf | 644 | } |
07be84bf JK |
645 | } |
646 | ||
647 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
648 | ||
08b8a139 | 649 | static const registry<objfile>::key<htab, htab_deleter> |
8127a2fa | 650 | elf_objfile_gnu_ifunc_cache_data; |
07be84bf JK |
651 | |
652 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
653 | ||
654 | struct elf_gnu_ifunc_cache | |
655 | { | |
656 | /* This is always a function entry address, not a function descriptor. */ | |
657 | CORE_ADDR addr; | |
658 | ||
659 | char name[1]; | |
660 | }; | |
661 | ||
662 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
663 | ||
664 | static hashval_t | |
665 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
666 | { | |
9a3c8263 SM |
667 | const struct elf_gnu_ifunc_cache *a |
668 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
07be84bf JK |
669 | |
670 | return htab_hash_string (a->name); | |
671 | } | |
672 | ||
673 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
674 | ||
675 | static int | |
676 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
677 | { | |
9a3c8263 SM |
678 | const struct elf_gnu_ifunc_cache *a |
679 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
680 | const struct elf_gnu_ifunc_cache *b | |
681 | = (const struct elf_gnu_ifunc_cache *) b_voidp; | |
07be84bf JK |
682 | |
683 | return strcmp (a->name, b->name) == 0; | |
684 | } | |
685 | ||
686 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
687 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
688 | valid and therefore they were successfully recorded, return 0 otherwise. | |
689 | ||
690 | Function does not expect a duplicate entry. Use | |
691 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
692 | exists. */ | |
693 | ||
694 | static int | |
695 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
696 | { | |
7cbd4a93 | 697 | struct bound_minimal_symbol msym; |
07be84bf JK |
698 | struct objfile *objfile; |
699 | htab_t htab; | |
700 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
701 | void **slot; | |
702 | ||
703 | msym = lookup_minimal_symbol_by_pc (addr); | |
7cbd4a93 | 704 | if (msym.minsym == NULL) |
07be84bf | 705 | return 0; |
4aeddc50 | 706 | if (msym.value_address () != addr) |
07be84bf | 707 | return 0; |
e27d198c | 708 | objfile = msym.objfile; |
07be84bf JK |
709 | |
710 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
1adeb822 | 711 | resolution and it has no use for GDB. */ |
c9d95fa3 | 712 | const char *target_name = msym.minsym->linkage_name (); |
1adeb822 PA |
713 | size_t len = strlen (target_name); |
714 | ||
715 | /* Note we check the symbol's name instead of checking whether the | |
716 | symbol is in the .plt section because some systems have @plt | |
717 | symbols in the .text section. */ | |
718 | if (len > 4 && strcmp (target_name + len - 4, "@plt") == 0) | |
07be84bf JK |
719 | return 0; |
720 | ||
600b5fc2 HL |
721 | if (strcmp (target_name, "_PROCEDURE_LINKAGE_TABLE_") == 0) |
722 | return 0; | |
723 | ||
8127a2fa | 724 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); |
07be84bf JK |
725 | if (htab == NULL) |
726 | { | |
8127a2fa TT |
727 | htab = htab_create_alloc (1, elf_gnu_ifunc_cache_hash, |
728 | elf_gnu_ifunc_cache_eq, | |
729 | NULL, xcalloc, xfree); | |
730 | elf_objfile_gnu_ifunc_cache_data.set (objfile, htab); | |
07be84bf JK |
731 | } |
732 | ||
733 | entry_local.addr = addr; | |
734 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
735 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
736 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
224c3ddb SM |
737 | entry_p |
738 | = (struct elf_gnu_ifunc_cache *) obstack_finish (&objfile->objfile_obstack); | |
07be84bf JK |
739 | |
740 | slot = htab_find_slot (htab, entry_p, INSERT); | |
741 | if (*slot != NULL) | |
742 | { | |
9a3c8263 SM |
743 | struct elf_gnu_ifunc_cache *entry_found_p |
744 | = (struct elf_gnu_ifunc_cache *) *slot; | |
08feed99 | 745 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf JK |
746 | |
747 | if (entry_found_p->addr != addr) | |
748 | { | |
749 | /* This case indicates buggy inferior program, the resolved address | |
750 | should never change. */ | |
751 | ||
752 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
753 | "function_address from %s to %s"), | |
754 | name, paddress (gdbarch, entry_found_p->addr), | |
755 | paddress (gdbarch, addr)); | |
756 | } | |
757 | ||
758 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
759 | } | |
760 | *slot = entry_p; | |
761 | ||
762 | return 1; | |
763 | } | |
764 | ||
765 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
766 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
767 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
768 | ||
769 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
770 | function. */ | |
771 | ||
772 | static int | |
773 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
774 | { | |
1dc9084f MM |
775 | int found = 0; |
776 | ||
777 | /* FIXME: we only search the initial namespace. | |
778 | ||
779 | To search other namespaces, we would need to provide context, e.g. in | |
780 | form of an objfile in that namespace. */ | |
781 | gdbarch_iterate_over_objfiles_in_search_order | |
99d9c3b9 | 782 | (current_inferior ()->arch (), |
1dc9084f MM |
783 | [name, &addr_p, &found] (struct objfile *objfile) |
784 | { | |
785 | htab_t htab; | |
786 | elf_gnu_ifunc_cache *entry_p; | |
787 | void **slot; | |
788 | ||
789 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); | |
790 | if (htab == NULL) | |
791 | return 0; | |
792 | ||
793 | entry_p = ((elf_gnu_ifunc_cache *) | |
794 | alloca (sizeof (*entry_p) + strlen (name))); | |
795 | strcpy (entry_p->name, name); | |
796 | ||
797 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
798 | if (slot == NULL) | |
799 | return 0; | |
800 | entry_p = (elf_gnu_ifunc_cache *) *slot; | |
801 | gdb_assert (entry_p != NULL); | |
802 | ||
803 | if (addr_p) | |
804 | *addr_p = entry_p->addr; | |
805 | ||
806 | found = 1; | |
807 | return 1; | |
808 | }, nullptr); | |
809 | ||
810 | return found; | |
07be84bf JK |
811 | } |
812 | ||
813 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
814 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
815 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
816 | ||
817 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
818 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
819 | prevent cache entries duplicates. */ | |
820 | ||
821 | static int | |
822 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
823 | { | |
824 | char *name_got_plt; | |
07be84bf | 825 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
1dc9084f | 826 | int found = 0; |
07be84bf | 827 | |
224c3ddb | 828 | name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1); |
07be84bf JK |
829 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); |
830 | ||
1dc9084f MM |
831 | /* FIXME: we only search the initial namespace. |
832 | ||
833 | To search other namespaces, we would need to provide context, e.g. in | |
834 | form of an objfile in that namespace. */ | |
835 | gdbarch_iterate_over_objfiles_in_search_order | |
99d9c3b9 | 836 | (current_inferior ()->arch (), |
1dc9084f MM |
837 | [name, name_got_plt, &addr_p, &found] (struct objfile *objfile) |
838 | { | |
839 | bfd *obfd = objfile->obfd.get (); | |
840 | struct gdbarch *gdbarch = objfile->arch (); | |
841 | type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; | |
842 | size_t ptr_size = ptr_type->length (); | |
843 | CORE_ADDR pointer_address, addr; | |
844 | asection *plt; | |
845 | gdb_byte *buf = (gdb_byte *) alloca (ptr_size); | |
846 | bound_minimal_symbol msym; | |
847 | ||
848 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
849 | if (msym.minsym == NULL) | |
850 | return 0; | |
851 | if (msym.minsym->type () != mst_slot_got_plt) | |
852 | return 0; | |
853 | pointer_address = msym.value_address (); | |
854 | ||
855 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
856 | if (plt == NULL) | |
857 | return 0; | |
858 | ||
859 | if (msym.minsym->size () != ptr_size) | |
860 | return 0; | |
861 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
862 | return 0; | |
863 | addr = extract_typed_address (buf, ptr_type); | |
864 | addr = gdbarch_convert_from_func_ptr_addr | |
865 | (gdbarch, addr, current_inferior ()->top_target ()); | |
866 | addr = gdbarch_addr_bits_remove (gdbarch, addr); | |
867 | ||
868 | if (elf_gnu_ifunc_record_cache (name, addr)) | |
869 | { | |
870 | if (addr_p != NULL) | |
871 | *addr_p = addr; | |
872 | ||
873 | found = 1; | |
874 | return 1; | |
875 | } | |
876 | ||
877 | return 0; | |
878 | }, nullptr); | |
879 | ||
880 | return found; | |
07be84bf JK |
881 | } |
882 | ||
883 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
884 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
ececd218 | 885 | is not NULL) and the function returns true. It returns false otherwise. |
07be84bf JK |
886 | |
887 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
888 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
889 | ||
ececd218 | 890 | static bool |
07be84bf JK |
891 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) |
892 | { | |
893 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
ececd218 | 894 | return true; |
dea91a5c | 895 | |
07be84bf | 896 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
ececd218 | 897 | return true; |
07be84bf | 898 | |
ececd218 | 899 | return false; |
07be84bf JK |
900 | } |
901 | ||
902 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
903 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
904 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
905 | */ | |
906 | ||
907 | static CORE_ADDR | |
908 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
909 | { | |
2c02bd72 | 910 | const char *name_at_pc; |
07be84bf JK |
911 | CORE_ADDR start_at_pc, address; |
912 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
913 | struct value *function, *address_val; | |
e1b2624a AA |
914 | CORE_ADDR hwcap = 0; |
915 | struct value *hwcap_val; | |
07be84bf JK |
916 | |
917 | /* Try first any non-intrusive methods without an inferior call. */ | |
918 | ||
919 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
920 | && start_at_pc == pc) | |
921 | { | |
922 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
923 | return address; | |
924 | } | |
925 | else | |
926 | name_at_pc = NULL; | |
927 | ||
317c3ed9 | 928 | function = value::allocate (func_func_type); |
6f9c9d71 | 929 | function->set_lval (lval_memory); |
9feb2d07 | 930 | function->set_address (pc); |
07be84bf | 931 | |
e1b2624a AA |
932 | /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as |
933 | parameter. FUNCTION is the function entry address. ADDRESS may be a | |
934 | function descriptor. */ | |
07be84bf | 935 | |
82d23ca8 | 936 | target_auxv_search (AT_HWCAP, &hwcap); |
e1b2624a AA |
937 | hwcap_val = value_from_longest (builtin_type (gdbarch) |
938 | ->builtin_unsigned_long, hwcap); | |
e71585ff | 939 | address_val = call_function_by_hand (function, NULL, hwcap_val); |
07be84bf | 940 | address = value_as_address (address_val); |
328d42d8 SM |
941 | address = gdbarch_convert_from_func_ptr_addr |
942 | (gdbarch, address, current_inferior ()->top_target ()); | |
4b7d1f7f | 943 | address = gdbarch_addr_bits_remove (gdbarch, address); |
07be84bf JK |
944 | |
945 | if (name_at_pc) | |
946 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
947 | ||
948 | return address; | |
949 | } | |
950 | ||
0e30163f JK |
951 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
952 | ||
953 | static void | |
74421c0b | 954 | elf_gnu_ifunc_resolver_stop (code_breakpoint *b) |
0e30163f JK |
955 | { |
956 | struct breakpoint *b_return; | |
bd2b40ac | 957 | frame_info_ptr prev_frame = get_prev_frame (get_current_frame ()); |
0e30163f JK |
958 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); |
959 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
00431a78 | 960 | int thread_id = inferior_thread ()->global_num; |
0e30163f JK |
961 | |
962 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
963 | ||
964 | for (b_return = b->related_breakpoint; b_return != b; | |
965 | b_return = b_return->related_breakpoint) | |
966 | { | |
967 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
9dc1523b | 968 | gdb_assert (b_return->has_single_location ()); |
0e30163f JK |
969 | gdb_assert (frame_id_p (b_return->frame_id)); |
970 | ||
971 | if (b_return->thread == thread_id | |
f5951b9f | 972 | && b_return->first_loc ().requested_address == prev_pc |
a0cbd650 | 973 | && b_return->frame_id == prev_frame_id) |
0e30163f JK |
974 | break; |
975 | } | |
976 | ||
977 | if (b_return == b) | |
978 | { | |
0e30163f JK |
979 | /* No need to call find_pc_line for symbols resolving as this is only |
980 | a helper breakpointer never shown to the user. */ | |
981 | ||
51abb421 | 982 | symtab_and_line sal; |
0e30163f JK |
983 | sal.pspace = current_inferior ()->pspace; |
984 | sal.pc = prev_pc; | |
985 | sal.section = find_pc_overlay (sal.pc); | |
986 | sal.explicit_pc = 1; | |
454dafbd TT |
987 | b_return |
988 | = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
989 | prev_frame_id, | |
990 | bp_gnu_ifunc_resolver_return).release (); | |
0e30163f | 991 | |
c70a6932 JK |
992 | /* set_momentary_breakpoint invalidates PREV_FRAME. */ |
993 | prev_frame = NULL; | |
994 | ||
0e30163f JK |
995 | /* Add new b_return to the ring list b->related_breakpoint. */ |
996 | gdb_assert (b_return->related_breakpoint == b_return); | |
997 | b_return->related_breakpoint = b->related_breakpoint; | |
998 | b->related_breakpoint = b_return; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
1003 | ||
1004 | static void | |
74421c0b | 1005 | elf_gnu_ifunc_resolver_return_stop (code_breakpoint *b) |
0e30163f | 1006 | { |
00431a78 | 1007 | thread_info *thread = inferior_thread (); |
0e30163f JK |
1008 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
1009 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
27710edb | 1010 | struct type *value_type = func_func_type->target_type (); |
00431a78 | 1011 | struct regcache *regcache = get_thread_regcache (thread); |
6a3a010b | 1012 | struct value *func_func; |
0e30163f JK |
1013 | struct value *value; |
1014 | CORE_ADDR resolved_address, resolved_pc; | |
0e30163f JK |
1015 | |
1016 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
1017 | ||
0e30163f JK |
1018 | while (b->related_breakpoint != b) |
1019 | { | |
1020 | struct breakpoint *b_next = b->related_breakpoint; | |
1021 | ||
1022 | switch (b->type) | |
1023 | { | |
1024 | case bp_gnu_ifunc_resolver: | |
1025 | break; | |
1026 | case bp_gnu_ifunc_resolver_return: | |
1027 | delete_breakpoint (b); | |
1028 | break; | |
1029 | default: | |
f34652de | 1030 | internal_error (_("handle_inferior_event: Invalid " |
0e30163f JK |
1031 | "gnu-indirect-function breakpoint type %d"), |
1032 | (int) b->type); | |
1033 | } | |
6a9196a6 | 1034 | b = gdb::checked_static_cast<code_breakpoint *> (b_next); |
0e30163f JK |
1035 | } |
1036 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
9dc1523b | 1037 | gdb_assert (b->has_single_location ()); |
6a3a010b | 1038 | |
317c3ed9 | 1039 | func_func = value::allocate (func_func_type); |
6f9c9d71 | 1040 | func_func->set_lval (lval_memory); |
f5951b9f | 1041 | func_func->set_address (b->first_loc ().related_address); |
6a3a010b | 1042 | |
317c3ed9 | 1043 | value = value::allocate (value_type); |
4e1d2f58 TT |
1044 | gdbarch_return_value_as_value (gdbarch, func_func, value_type, regcache, |
1045 | &value, NULL); | |
6a3a010b | 1046 | resolved_address = value_as_address (value); |
328d42d8 SM |
1047 | resolved_pc = gdbarch_convert_from_func_ptr_addr |
1048 | (gdbarch, resolved_address, current_inferior ()->top_target ()); | |
4b7d1f7f | 1049 | resolved_pc = gdbarch_addr_bits_remove (gdbarch, resolved_pc); |
0e30163f | 1050 | |
f8eba3c6 | 1051 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
709438c7 | 1052 | elf_gnu_ifunc_record_cache (b->locspec->to_string (), resolved_pc); |
0e30163f | 1053 | |
0e30163f | 1054 | b->type = bp_breakpoint; |
6c5b2ebe | 1055 | update_breakpoint_locations (b, current_program_space, |
79188d8d PA |
1056 | find_function_start_sal (resolved_pc, NULL, true), |
1057 | {}); | |
0e30163f JK |
1058 | } |
1059 | ||
2750ef27 TT |
1060 | /* A helper function for elf_symfile_read that reads the minimal |
1061 | symbols. */ | |
c906108c SS |
1062 | |
1063 | static void | |
5f6cac40 TT |
1064 | elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags, |
1065 | const struct elfinfo *ei) | |
c906108c | 1066 | { |
98badbfd | 1067 | bfd *synth_abfd, *abfd = objfile->obfd.get (); |
62553543 EZ |
1068 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1069 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1070 | asymbol *synthsyms; | |
c906108c | 1071 | |
2ab317fb SM |
1072 | symtab_create_debug_printf ("reading minimal symbols of objfile %s", |
1073 | objfile_name (objfile)); | |
45cfd468 | 1074 | |
5f6cac40 TT |
1075 | /* If we already have minsyms, then we can skip some work here. |
1076 | However, if there were stabs or mdebug sections, we go ahead and | |
1077 | redo all the work anyway, because the psym readers for those | |
1078 | kinds of debuginfo need extra information found here. This can | |
1079 | go away once all types of symbols are in the per-BFD object. */ | |
1080 | if (objfile->per_bfd->minsyms_read | |
1081 | && ei->stabsect == NULL | |
30d1f018 WP |
1082 | && ei->mdebugsect == NULL |
1083 | && ei->ctfsect == NULL) | |
5f6cac40 | 1084 | { |
2ab317fb | 1085 | symtab_create_debug_printf ("minimal symbols were previously read"); |
5f6cac40 TT |
1086 | return; |
1087 | } | |
1088 | ||
d25e8719 | 1089 | minimal_symbol_reader reader (objfile); |
c906108c | 1090 | |
18a94d75 | 1091 | /* Process the normal ELF symbol table first. */ |
c906108c | 1092 | |
98badbfd | 1093 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd.get ()); |
62553543 | 1094 | if (storage_needed < 0) |
3e43a32a | 1095 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1096 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1097 | bfd_errmsg (bfd_get_error ())); |
1098 | ||
1099 | if (storage_needed > 0) | |
1100 | { | |
80c57053 JK |
1101 | /* Memory gets permanently referenced from ABFD after |
1102 | bfd_canonicalize_symtab so it must not get freed before ABFD gets. */ | |
1103 | ||
224c3ddb | 1104 | symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
98badbfd | 1105 | symcount = bfd_canonicalize_symtab (objfile->obfd.get (), symbol_table); |
62553543 EZ |
1106 | |
1107 | if (symcount < 0) | |
3e43a32a | 1108 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1109 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1110 | bfd_errmsg (bfd_get_error ())); |
1111 | ||
ce6c454e TT |
1112 | elf_symtab_read (reader, objfile, ST_REGULAR, symcount, symbol_table, |
1113 | false); | |
62553543 | 1114 | } |
c906108c SS |
1115 | |
1116 | /* Add the dynamic symbols. */ | |
1117 | ||
98badbfd | 1118 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd.get ()); |
62553543 EZ |
1119 | |
1120 | if (storage_needed > 0) | |
1121 | { | |
3f1eff0a JK |
1122 | /* Memory gets permanently referenced from ABFD after |
1123 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1124 | It happens only in the case when elf_slurp_reloc_table sees | |
1125 | asection->relocation NULL. Determining which section is asection is | |
1126 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1127 | implementation detail, though. */ | |
1128 | ||
224c3ddb | 1129 | dyn_symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
98badbfd | 1130 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd.get (), |
62553543 EZ |
1131 | dyn_symbol_table); |
1132 | ||
1133 | if (dynsymcount < 0) | |
3e43a32a | 1134 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1135 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1136 | bfd_errmsg (bfd_get_error ())); |
1137 | ||
8dddcb8f | 1138 | elf_symtab_read (reader, objfile, ST_DYNAMIC, dynsymcount, |
ce6c454e | 1139 | dyn_symbol_table, false); |
07be84bf | 1140 | |
8dddcb8f | 1141 | elf_rel_plt_read (reader, objfile, dyn_symbol_table); |
62553543 EZ |
1142 | } |
1143 | ||
63524580 JK |
1144 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1145 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1146 | ||
1147 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1148 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1149 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1150 | read the code address from .opd while it reads the .symtab section from | |
1151 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1152 | ||
1153 | With SYNTH_ABFD the .opd section will be read from the original | |
1154 | backlinked binary where it is valid. */ | |
1155 | ||
1156 | if (objfile->separate_debug_objfile_backlink) | |
98badbfd | 1157 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd.get (); |
63524580 JK |
1158 | else |
1159 | synth_abfd = abfd; | |
1160 | ||
62553543 EZ |
1161 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1162 | ||
63524580 | 1163 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1164 | dynsymcount, dyn_symbol_table, |
1165 | &synthsyms); | |
1166 | if (synthcount > 0) | |
1167 | { | |
62553543 EZ |
1168 | long i; |
1169 | ||
b22e99fd | 1170 | std::unique_ptr<asymbol *[]> |
d1e4a624 | 1171 | synth_symbol_table (new asymbol *[synthcount]); |
62553543 | 1172 | for (i = 0; i < synthcount; i++) |
9f20e3da | 1173 | synth_symbol_table[i] = synthsyms + i; |
8dddcb8f | 1174 | elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount, |
ce6c454e | 1175 | synth_symbol_table.get (), true); |
ba713918 AL |
1176 | |
1177 | xfree (synthsyms); | |
1178 | synthsyms = NULL; | |
62553543 | 1179 | } |
c906108c | 1180 | |
7134143f DJ |
1181 | /* Install any minimal symbols that have been collected as the current |
1182 | minimal symbols for this objfile. The debug readers below this point | |
1183 | should not generate new minimal symbols; if they do it's their | |
1184 | responsibility to install them. "mdebug" appears to be the only one | |
1185 | which will do this. */ | |
1186 | ||
d25e8719 | 1187 | reader.install (); |
7134143f | 1188 | |
2ab317fb | 1189 | symtab_create_debug_printf ("done reading minimal symbols"); |
2750ef27 TT |
1190 | } |
1191 | ||
d955d179 TV |
1192 | /* Dwarf-specific helper for elf_symfile_read. Return true if we managed to |
1193 | load dwarf debug info. */ | |
1194 | ||
1195 | static bool | |
1196 | elf_symfile_read_dwarf2 (struct objfile *objfile, | |
1197 | symfile_add_flags symfile_flags) | |
1198 | { | |
1199 | bool has_dwarf2 = true; | |
1200 | ||
1201 | if (dwarf2_has_info (objfile, NULL, true)) | |
1202 | dwarf2_initialize_objfile (objfile); | |
1203 | /* If the file has its own symbol tables it has no separate debug | |
1204 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1205 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
1206 | `.note.gnu.build-id'. | |
1207 | ||
1208 | .gnu_debugdata is !objfile::has_partial_symbols because it contains only | |
1209 | .symtab, not .debug_* section. But if we already added .gnu_debugdata as | |
1210 | an objfile via find_separate_debug_file_in_section there was no separate | |
1211 | debug info available. Therefore do not attempt to search for another one, | |
1212 | objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to | |
1213 | be NULL and we would possibly violate it. */ | |
1214 | ||
1215 | else if (!objfile->has_partial_symbols () | |
1216 | && objfile->separate_debug_objfile == NULL | |
1217 | && objfile->separate_debug_objfile_backlink == NULL) | |
1218 | { | |
27807da5 AB |
1219 | if (objfile->find_and_add_separate_symbol_file (symfile_flags)) |
1220 | gdb_assert (objfile->separate_debug_objfile != nullptr); | |
d955d179 | 1221 | else |
27807da5 | 1222 | has_dwarf2 = false; |
d955d179 TV |
1223 | } |
1224 | ||
1225 | return has_dwarf2; | |
1226 | } | |
1227 | ||
2750ef27 TT |
1228 | /* Scan and build partial symbols for a symbol file. |
1229 | We have been initialized by a call to elf_symfile_init, which | |
1230 | currently does nothing. | |
1231 | ||
2750ef27 TT |
1232 | This function only does the minimum work necessary for letting the |
1233 | user "name" things symbolically; it does not read the entire symtab. | |
1234 | Instead, it reads the external and static symbols and puts them in partial | |
1235 | symbol tables. When more extensive information is requested of a | |
1236 | file, the corresponding partial symbol table is mutated into a full | |
1237 | fledged symbol table by going back and reading the symbols | |
1238 | for real. | |
1239 | ||
1240 | We look for sections with specific names, to tell us what debug | |
1241 | format to look for: FIXME!!! | |
1242 | ||
1243 | elfstab_build_psymtabs() handles STABS symbols; | |
1244 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1245 | ||
1246 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1247 | like a COFF symbol table, but has only the minimal information necessary | |
1248 | for linking. We process this also, and use the information to | |
1249 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1250 | capability even for files compiled without -g. */ | |
1251 | ||
1252 | static void | |
b15cc25c | 1253 | elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
2750ef27 | 1254 | { |
98badbfd | 1255 | bfd *abfd = objfile->obfd.get (); |
2750ef27 TT |
1256 | struct elfinfo ei; |
1257 | ||
2750ef27 | 1258 | memset ((char *) &ei, 0, sizeof (ei)); |
97cbe998 | 1259 | if (!(objfile->flags & OBJF_READNEVER)) |
08f93a1a TT |
1260 | { |
1261 | for (asection *sect : gdb_bfd_sections (abfd)) | |
1262 | elf_locate_sections (sect, &ei); | |
1263 | } | |
c906108c | 1264 | |
5f6cac40 TT |
1265 | elf_read_minimal_symbols (objfile, symfile_flags, &ei); |
1266 | ||
c906108c SS |
1267 | /* ELF debugging information is inserted into the psymtab in the |
1268 | order of least informative first - most informative last. Since | |
1269 | the psymtab table is searched `most recent insertion first' this | |
1270 | increases the probability that more detailed debug information | |
1271 | for a section is found. | |
1272 | ||
1273 | For instance, an object file might contain both .mdebug (XCOFF) | |
1274 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1275 | (searched last) and DWARF2 is inserted last (searched first). If | |
1276 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1277 | an included file XCOFF info is useless. */ |
c906108c SS |
1278 | |
1279 | if (ei.mdebugsect) | |
1280 | { | |
1281 | const struct ecoff_debug_swap *swap; | |
1282 | ||
1283 | /* .mdebug section, presumably holding ECOFF debugging | |
dda83cd7 | 1284 | information. */ |
c906108c SS |
1285 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1286 | if (swap) | |
d4f3574e | 1287 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1288 | } |
1289 | if (ei.stabsect) | |
1290 | { | |
1291 | asection *str_sect; | |
1292 | ||
1293 | /* Stab sections have an associated string table that looks like | |
dda83cd7 | 1294 | a separate section. */ |
c906108c SS |
1295 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1296 | ||
1297 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1298 | if (str_sect) | |
1299 | elfstab_build_psymtabs (objfile, | |
086df311 | 1300 | ei.stabsect, |
c906108c | 1301 | str_sect->filepos, |
fd361982 | 1302 | bfd_section_size (str_sect)); |
c906108c | 1303 | } |
9291a0cd | 1304 | |
0d5adb56 TV |
1305 | /* Read the CTF section only if there is no DWARF info. */ |
1306 | if (always_read_ctf && ei.ctfsect) | |
1307 | { | |
1308 | elfctf_build_psymtabs (objfile); | |
1309 | } | |
1310 | ||
d955d179 | 1311 | bool has_dwarf2 = elf_symfile_read_dwarf2 (objfile, symfile_flags); |
30d1f018 WP |
1312 | |
1313 | /* Read the CTF section only if there is no DWARF info. */ | |
0d5adb56 | 1314 | if (!always_read_ctf && !has_dwarf2 && ei.ctfsect) |
30d1f018 WP |
1315 | { |
1316 | elfctf_build_psymtabs (objfile); | |
9cce227f | 1317 | } |
62669649 KB |
1318 | |
1319 | /* Copy relocations are used by some ABIs using the ELF format, so | |
1320 | set the objfile flag indicating this fact. */ | |
1321 | objfile->object_format_has_copy_relocs = true; | |
c906108c SS |
1322 | } |
1323 | ||
c906108c SS |
1324 | /* Initialize anything that needs initializing when a completely new symbol |
1325 | file is specified (not just adding some symbols from another file, e.g. a | |
caa429d8 | 1326 | shared library). */ |
c906108c SS |
1327 | |
1328 | static void | |
fba45db2 | 1329 | elf_new_init (struct objfile *ignore) |
c906108c | 1330 | { |
c906108c SS |
1331 | } |
1332 | ||
1333 | /* Perform any local cleanups required when we are done with a particular | |
1334 | objfile. I.E, we are in the process of discarding all symbol information | |
1335 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1336 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1337 | |
1338 | static void | |
fba45db2 | 1339 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1340 | { |
c906108c SS |
1341 | } |
1342 | ||
db7a9bcd | 1343 | /* ELF specific initialization routine for reading symbols. */ |
c906108c SS |
1344 | |
1345 | static void | |
fba45db2 | 1346 | elf_symfile_init (struct objfile *objfile) |
c906108c | 1347 | { |
c906108c SS |
1348 | } |
1349 | ||
55aa24fb SDJ |
1350 | /* Implementation of `sym_get_probes', as documented in symfile.h. */ |
1351 | ||
814cf43a | 1352 | static const elfread_data & |
55aa24fb SDJ |
1353 | elf_get_probes (struct objfile *objfile) |
1354 | { | |
98badbfd | 1355 | elfread_data *probes_per_bfd = probe_key.get (objfile->obfd.get ()); |
55aa24fb | 1356 | |
aaa63a31 | 1357 | if (probes_per_bfd == NULL) |
55aa24fb | 1358 | { |
98badbfd | 1359 | probes_per_bfd = probe_key.emplace (objfile->obfd.get ()); |
55aa24fb SDJ |
1360 | |
1361 | /* Here we try to gather information about all types of probes from the | |
1362 | objfile. */ | |
935676c9 | 1363 | for (const static_probe_ops *ops : all_static_probe_ops) |
0782db84 | 1364 | ops->get_probes (probes_per_bfd, objfile); |
55aa24fb SDJ |
1365 | } |
1366 | ||
aaa63a31 | 1367 | return *probes_per_bfd; |
55aa24fb SDJ |
1368 | } |
1369 | ||
c906108c | 1370 | \f |
55aa24fb SDJ |
1371 | |
1372 | /* Implementation `sym_probe_fns', as documented in symfile.h. */ | |
1373 | ||
1374 | static const struct sym_probe_fns elf_probe_fns = | |
1375 | { | |
25f9533e | 1376 | elf_get_probes, /* sym_get_probes */ |
55aa24fb SDJ |
1377 | }; |
1378 | ||
c906108c SS |
1379 | /* Register that we are able to handle ELF object file formats. */ |
1380 | ||
00b5771c | 1381 | static const struct sym_fns elf_sym_fns = |
c906108c | 1382 | { |
3e43a32a MS |
1383 | elf_new_init, /* init anything gbl to entire symtab */ |
1384 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1385 | elf_symfile_read, /* read a symbol file into symtab */ | |
1386 | elf_symfile_finish, /* finished with file, cleanup */ | |
1387 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1388 | elf_symfile_segments, /* Get segment information from a file. */ | |
1389 | NULL, | |
1390 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1391 | &elf_probe_fns, /* sym_probe_fns */ |
927aa2e7 JK |
1392 | }; |
1393 | ||
07be84bf JK |
1394 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1395 | ||
1396 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1397 | { | |
1398 | elf_gnu_ifunc_resolve_addr, | |
1399 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1400 | elf_gnu_ifunc_resolver_stop, |
1401 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1402 | }; |
1403 | ||
6c265988 | 1404 | void _initialize_elfread (); |
c906108c | 1405 | void |
6c265988 | 1406 | _initialize_elfread () |
c906108c | 1407 | { |
c256e171 | 1408 | add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns); |
07be84bf | 1409 | |
07be84bf | 1410 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; |
0d5adb56 TV |
1411 | |
1412 | /* Add "set always-read-ctf on/off". */ | |
1413 | add_setshow_boolean_cmd ("always-read-ctf", class_support, &always_read_ctf, | |
1414 | _("\ | |
1415 | Set whether CTF is always read."), | |
1416 | _("\ | |
1417 | Show whether CTF is always read."), | |
1418 | _("\ | |
1419 | When off, CTF is only read if DWARF is not present. When on, CTF is read\ | |
1420 | regardless of whether DWARF is present."), | |
1421 | nullptr /* set_func */, nullptr /* show_func */, | |
1422 | &setlist, &showlist); | |
c906108c | 1423 | } |