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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 | |
4b610737 | 222 | struct minimal_symbol *result |
44e4c775 | 223 | = reader.record_full (name, copy_name, address, ms_type, section_index); |
4b610737 TT |
224 | if ((objfile->flags & OBJF_MAINLINE) == 0 |
225 | && (ms_type == mst_data || ms_type == mst_bss)) | |
226 | result->maybe_copied = 1; | |
227 | ||
228 | return result; | |
c906108c SS |
229 | } |
230 | ||
7f86f058 | 231 | /* Read the symbol table of an ELF file. |
c906108c | 232 | |
62553543 | 233 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
234 | symbol table contains regular, dynamic, or synthetic symbols, add all |
235 | the global function and data symbols to the minimal symbol table. | |
c906108c | 236 | |
c5aa993b JM |
237 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
238 | defined in the ELF symbol table, which can be used to locate | |
239 | the beginnings of sections from each ".o" file that was linked to | |
240 | form the executable objfile. We gather any such info and record it | |
7f86f058 | 241 | in data structures hung off the objfile's private data. */ |
c906108c | 242 | |
6f610d07 UW |
243 | #define ST_REGULAR 0 |
244 | #define ST_DYNAMIC 1 | |
245 | #define ST_SYNTHETIC 2 | |
246 | ||
c906108c | 247 | static void |
8dddcb8f TT |
248 | elf_symtab_read (minimal_symbol_reader &reader, |
249 | struct objfile *objfile, int type, | |
04a679b8 | 250 | long number_of_symbols, asymbol **symbol_table, |
ce6c454e | 251 | bool copy_names) |
c906108c | 252 | { |
08feed99 | 253 | struct gdbarch *gdbarch = objfile->arch (); |
c906108c | 254 | asymbol *sym; |
c906108c | 255 | long i; |
c906108c SS |
256 | CORE_ADDR symaddr; |
257 | enum minimal_symbol_type ms_type; | |
18a94d75 DE |
258 | /* Name of the last file symbol. This is either a constant string or is |
259 | saved on the objfile's filename cache. */ | |
0af1e9a5 | 260 | const char *filesymname = ""; |
98badbfd | 261 | int stripped = (bfd_get_symcount (objfile->obfd.get ()) == 0); |
3e29f34a MR |
262 | int elf_make_msymbol_special_p |
263 | = gdbarch_elf_make_msymbol_special_p (gdbarch); | |
c5aa993b | 264 | |
0cc7b392 | 265 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 266 | { |
0cc7b392 DJ |
267 | sym = symbol_table[i]; |
268 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 269 | { |
0cc7b392 | 270 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 271 | that are null strings (may happen). */ |
0cc7b392 DJ |
272 | continue; |
273 | } | |
c906108c | 274 | |
28a4e64d TT |
275 | elf_symbol_type *elf_sym = (elf_symbol_type *) sym; |
276 | ||
74763737 DJ |
277 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
278 | symbols which do not correspond to objects in the symbol table, | |
279 | but have some other target-specific meaning. */ | |
98badbfd | 280 | if (bfd_is_target_special_symbol (objfile->obfd.get (), sym)) |
60c5725c DJ |
281 | { |
282 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
283 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
284 | continue; | |
285 | } | |
74763737 | 286 | |
6f610d07 | 287 | if (type == ST_DYNAMIC |
45dfa85a | 288 | && sym->section == bfd_und_section_ptr |
0cc7b392 DJ |
289 | && (sym->flags & BSF_FUNCTION)) |
290 | { | |
291 | struct minimal_symbol *msym; | |
98badbfd | 292 | bfd *abfd = objfile->obfd.get (); |
dea91a5c | 293 | asection *sect; |
0cc7b392 DJ |
294 | |
295 | /* Symbol is a reference to a function defined in | |
296 | a shared library. | |
297 | If its value is non zero then it is usually the address | |
298 | of the corresponding entry in the procedure linkage table, | |
299 | plus the desired section offset. | |
300 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 301 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
302 | for this symbol in the executable file, so we skip it. */ |
303 | symaddr = sym->value; | |
304 | if (symaddr == 0) | |
305 | continue; | |
02c75f72 UW |
306 | |
307 | /* sym->section is the undefined section. However, we want to | |
308 | record the section where the PLT stub resides with the | |
309 | minimal symbol. Search the section table for the one that | |
310 | covers the stub's address. */ | |
311 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
312 | { | |
fd361982 | 313 | if ((bfd_section_flags (sect) & SEC_ALLOC) == 0) |
02c75f72 UW |
314 | continue; |
315 | ||
fd361982 AM |
316 | if (symaddr >= bfd_section_vma (sect) |
317 | && symaddr < bfd_section_vma (sect) | |
318 | + bfd_section_size (sect)) | |
02c75f72 UW |
319 | break; |
320 | } | |
321 | if (!sect) | |
322 | continue; | |
323 | ||
828cfa8d JB |
324 | /* On ia64-hpux, we have discovered that the system linker |
325 | adds undefined symbols with nonzero addresses that cannot | |
326 | be right (their address points inside the code of another | |
327 | function in the .text section). This creates problems | |
328 | when trying to determine which symbol corresponds to | |
329 | a given address. | |
330 | ||
331 | We try to detect those buggy symbols by checking which | |
332 | section we think they correspond to. Normally, PLT symbols | |
333 | are stored inside their own section, and the typical name | |
334 | for that section is ".plt". So, if there is a ".plt" | |
335 | section, and yet the section name of our symbol does not | |
336 | start with ".plt", we ignore that symbol. */ | |
61012eef | 337 | if (!startswith (sect->name, ".plt") |
828cfa8d JB |
338 | && bfd_get_section_by_name (abfd, ".plt") != NULL) |
339 | continue; | |
340 | ||
0cc7b392 | 341 | msym = record_minimal_symbol |
31edb802 | 342 | (reader, sym->name, copy_names, |
9675da25 TT |
343 | unrelocated_addr (symaddr), |
344 | mst_solib_trampoline, sect, objfile); | |
0cc7b392 | 345 | if (msym != NULL) |
9b807e7b MR |
346 | { |
347 | msym->filename = filesymname; | |
3e29f34a MR |
348 | if (elf_make_msymbol_special_p) |
349 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
9b807e7b | 350 | } |
0cc7b392 DJ |
351 | continue; |
352 | } | |
c906108c | 353 | |
0cc7b392 DJ |
354 | /* If it is a nonstripped executable, do not enter dynamic |
355 | symbols, as the dynamic symbol table is usually a subset | |
356 | of the main symbol table. */ | |
6f610d07 | 357 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
358 | continue; |
359 | if (sym->flags & BSF_FILE) | |
be1e3d3e | 360 | filesymname = objfile->intern (sym->name); |
0cc7b392 DJ |
361 | else if (sym->flags & BSF_SECTION_SYM) |
362 | continue; | |
bb869963 SDJ |
363 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK |
364 | | BSF_GNU_UNIQUE)) | |
0cc7b392 DJ |
365 | { |
366 | struct minimal_symbol *msym; | |
367 | ||
368 | /* Select global/local/weak symbols. Note that bfd puts abs | |
369 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
370 | interested in will have a section. */ |
371 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 372 | symaddr = sym->value + sym->section->vma; |
0cc7b392 DJ |
373 | /* For non-absolute symbols, use the type of the section |
374 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 375 | no way of figuring this out for absolute symbols. */ |
45dfa85a | 376 | if (sym->section == bfd_abs_section_ptr) |
c906108c | 377 | { |
0cc7b392 DJ |
378 | /* This is a hack to get the minimal symbol type |
379 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
380 | with special section indices for dynamic symbols. |
381 | ||
382 | NOTE: uweigand-20071112: Synthetic symbols do not | |
383 | have an ELF-private part, so do not touch those. */ | |
dea91a5c | 384 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
28a4e64d | 385 | elf_sym->internal_elf_sym.st_shndx; |
0cc7b392 DJ |
386 | |
387 | switch (shndx) | |
c906108c | 388 | { |
0cc7b392 DJ |
389 | case SHN_MIPS_TEXT: |
390 | ms_type = mst_text; | |
391 | break; | |
392 | case SHN_MIPS_DATA: | |
393 | ms_type = mst_data; | |
394 | break; | |
395 | case SHN_MIPS_ACOMMON: | |
396 | ms_type = mst_bss; | |
397 | break; | |
398 | default: | |
399 | ms_type = mst_abs; | |
400 | } | |
401 | ||
402 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 403 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
404 | if (ms_type != mst_abs) |
405 | { | |
406 | if (sym->name[0] == '.') | |
407 | continue; | |
c906108c | 408 | } |
0cc7b392 DJ |
409 | } |
410 | else if (sym->section->flags & SEC_CODE) | |
411 | { | |
bb869963 | 412 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 413 | { |
0875794a JK |
414 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
415 | ms_type = mst_text_gnu_ifunc; | |
416 | else | |
417 | ms_type = mst_text; | |
0cc7b392 | 418 | } |
90359a16 JK |
419 | /* The BSF_SYNTHETIC check is there to omit ppc64 function |
420 | descriptors mistaken for static functions starting with 'L'. | |
421 | */ | |
422 | else if ((sym->name[0] == '.' && sym->name[1] == 'L' | |
423 | && (sym->flags & BSF_SYNTHETIC) == 0) | |
0cc7b392 DJ |
424 | || ((sym->flags & BSF_LOCAL) |
425 | && sym->name[0] == '$' | |
426 | && sym->name[1] == 'L')) | |
427 | /* Looks like a compiler-generated label. Skip | |
428 | it. The assembler should be skipping these (to | |
429 | keep executables small), but apparently with | |
430 | gcc on the (deleted) delta m88k SVR4, it loses. | |
431 | So to have us check too should be harmless (but | |
432 | I encourage people to fix this in the assembler | |
433 | instead of adding checks here). */ | |
434 | continue; | |
435 | else | |
436 | { | |
437 | ms_type = mst_file_text; | |
c906108c | 438 | } |
0cc7b392 DJ |
439 | } |
440 | else if (sym->section->flags & SEC_ALLOC) | |
441 | { | |
bb869963 | 442 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) |
c906108c | 443 | { |
f50776aa PA |
444 | if (sym->flags & BSF_GNU_INDIRECT_FUNCTION) |
445 | { | |
446 | ms_type = mst_data_gnu_ifunc; | |
447 | } | |
448 | else if (sym->section->flags & SEC_LOAD) | |
c906108c | 449 | { |
0cc7b392 | 450 | ms_type = mst_data; |
c906108c | 451 | } |
c906108c SS |
452 | else |
453 | { | |
0cc7b392 | 454 | ms_type = mst_bss; |
c906108c SS |
455 | } |
456 | } | |
0cc7b392 | 457 | else if (sym->flags & BSF_LOCAL) |
c906108c | 458 | { |
0cc7b392 DJ |
459 | if (sym->section->flags & SEC_LOAD) |
460 | { | |
461 | ms_type = mst_file_data; | |
c906108c SS |
462 | } |
463 | else | |
464 | { | |
0cc7b392 | 465 | ms_type = mst_file_bss; |
c906108c SS |
466 | } |
467 | } | |
468 | else | |
469 | { | |
0cc7b392 | 470 | ms_type = mst_unknown; |
c906108c | 471 | } |
0cc7b392 DJ |
472 | } |
473 | else | |
474 | { | |
475 | /* FIXME: Solaris2 shared libraries include lots of | |
dea91a5c | 476 | odd "absolute" and "undefined" symbols, that play |
0cc7b392 DJ |
477 | hob with actions like finding what function the PC |
478 | is in. Ignore them if they aren't text, data, or bss. */ | |
479 | /* ms_type = mst_unknown; */ | |
0963b4bd | 480 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
481 | } |
482 | msym = record_minimal_symbol | |
9675da25 | 483 | (reader, sym->name, copy_names, unrelocated_addr (symaddr), |
0cc7b392 | 484 | ms_type, sym->section, objfile); |
6f610d07 | 485 | |
0cc7b392 DJ |
486 | if (msym) |
487 | { | |
6f610d07 | 488 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an |
24c274a1 | 489 | ELF-private part. */ |
6f610d07 | 490 | if (type != ST_SYNTHETIC) |
24c274a1 AM |
491 | { |
492 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
5bbfd12d | 493 | msym->set_size (elf_sym->internal_elf_sym.st_size); |
24c274a1 | 494 | } |
dea91a5c | 495 | |
a103a963 | 496 | msym->filename = filesymname; |
3e29f34a MR |
497 | if (elf_make_msymbol_special_p) |
498 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 499 | } |
2eaf8d2a | 500 | |
715c6909 TT |
501 | /* If we see a default versioned symbol, install it under |
502 | its version-less name. */ | |
503 | if (msym != NULL) | |
504 | { | |
505 | const char *atsign = strchr (sym->name, '@'); | |
28a4e64d TT |
506 | bool is_at_symbol = atsign != nullptr && atsign > sym->name; |
507 | bool is_plt = is_at_symbol && strcmp (atsign, "@plt") == 0; | |
508 | int len = is_at_symbol ? atsign - sym->name : 0; | |
509 | ||
510 | if (is_at_symbol | |
511 | && !is_plt | |
512 | && (elf_sym->version & VERSYM_HIDDEN) == 0) | |
513 | record_minimal_symbol (reader, | |
514 | gdb::string_view (sym->name, len), | |
9675da25 TT |
515 | true, unrelocated_addr (symaddr), |
516 | ms_type, sym->section, objfile); | |
28a4e64d | 517 | else if (is_plt) |
2eaf8d2a | 518 | { |
28a4e64d TT |
519 | /* For @plt symbols, also record a trampoline to the |
520 | destination symbol. The @plt symbol will be used | |
521 | in disassembly, and the trampoline will be used | |
522 | when we are trying to find the target. */ | |
523 | if (ms_type == mst_text && type == ST_SYNTHETIC) | |
2eaf8d2a | 524 | { |
28a4e64d TT |
525 | struct minimal_symbol *mtramp; |
526 | ||
527 | mtramp = record_minimal_symbol | |
528 | (reader, gdb::string_view (sym->name, len), true, | |
9675da25 TT |
529 | unrelocated_addr (symaddr), |
530 | mst_solib_trampoline, sym->section, objfile); | |
28a4e64d TT |
531 | if (mtramp) |
532 | { | |
5bbfd12d | 533 | mtramp->set_size (msym->size()); |
28a4e64d TT |
534 | mtramp->created_by_gdb = 1; |
535 | mtramp->filename = filesymname; | |
536 | if (elf_make_msymbol_special_p) | |
537 | gdbarch_elf_make_msymbol_special (gdbarch, | |
538 | sym, mtramp); | |
539 | } | |
2eaf8d2a DJ |
540 | } |
541 | } | |
542 | } | |
c906108c | 543 | } |
c906108c SS |
544 | } |
545 | } | |
546 | ||
07be84bf JK |
547 | /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX) |
548 | for later look ups of which function to call when user requests | |
549 | a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target | |
550 | library defining `function' we cannot yet know while reading OBJFILE which | |
551 | of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later | |
552 | DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */ | |
553 | ||
554 | static void | |
8dddcb8f TT |
555 | elf_rel_plt_read (minimal_symbol_reader &reader, |
556 | struct objfile *objfile, asymbol **dyn_symbol_table) | |
07be84bf | 557 | { |
98badbfd | 558 | bfd *obfd = objfile->obfd.get (); |
07be84bf | 559 | const struct elf_backend_data *bed = get_elf_backend_data (obfd); |
02e169e2 | 560 | asection *relplt, *got_plt; |
07be84bf | 561 | bfd_size_type reloc_count, reloc; |
08feed99 | 562 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf | 563 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
df86565b | 564 | size_t ptr_size = ptr_type->length (); |
07be84bf JK |
565 | |
566 | if (objfile->separate_debug_objfile_backlink) | |
567 | return; | |
568 | ||
07be84bf JK |
569 | got_plt = bfd_get_section_by_name (obfd, ".got.plt"); |
570 | if (got_plt == NULL) | |
4b7d1f7f WN |
571 | { |
572 | /* For platforms where there is no separate .got.plt. */ | |
573 | got_plt = bfd_get_section_by_name (obfd, ".got"); | |
574 | if (got_plt == NULL) | |
575 | return; | |
576 | } | |
07be84bf | 577 | |
02e169e2 PA |
578 | /* Depending on system, we may find jump slots in a relocation |
579 | section for either .got.plt or .plt. */ | |
580 | asection *plt = bfd_get_section_by_name (obfd, ".plt"); | |
581 | int plt_elf_idx = (plt != NULL) ? elf_section_data (plt)->this_idx : -1; | |
582 | ||
583 | int got_plt_elf_idx = elf_section_data (got_plt)->this_idx; | |
584 | ||
07be84bf JK |
585 | /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */ |
586 | for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next) | |
02e169e2 PA |
587 | { |
588 | const auto &this_hdr = elf_section_data (relplt)->this_hdr; | |
589 | ||
590 | if (this_hdr.sh_type == SHT_REL || this_hdr.sh_type == SHT_RELA) | |
591 | { | |
592 | if (this_hdr.sh_info == plt_elf_idx | |
593 | || this_hdr.sh_info == got_plt_elf_idx) | |
594 | break; | |
595 | } | |
596 | } | |
07be84bf JK |
597 | if (relplt == NULL) |
598 | return; | |
599 | ||
600 | if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE)) | |
601 | return; | |
602 | ||
26fcd5d7 | 603 | std::string string_buffer; |
07be84bf | 604 | |
02e169e2 PA |
605 | /* Does ADDRESS reside in SECTION of OBFD? */ |
606 | auto within_section = [obfd] (asection *section, CORE_ADDR address) | |
607 | { | |
608 | if (section == NULL) | |
609 | return false; | |
610 | ||
fd361982 AM |
611 | return (bfd_section_vma (section) <= address |
612 | && (address < bfd_section_vma (section) | |
613 | + bfd_section_size (section))); | |
02e169e2 PA |
614 | }; |
615 | ||
07be84bf JK |
616 | reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize; |
617 | for (reloc = 0; reloc < reloc_count; reloc++) | |
618 | { | |
22e048c9 | 619 | const char *name; |
07be84bf JK |
620 | struct minimal_symbol *msym; |
621 | CORE_ADDR address; | |
26fcd5d7 | 622 | const char *got_suffix = SYMBOL_GOT_PLT_SUFFIX; |
07be84bf | 623 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
07be84bf JK |
624 | |
625 | name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr); | |
07be84bf JK |
626 | address = relplt->relocation[reloc].address; |
627 | ||
02e169e2 PA |
628 | asection *msym_section; |
629 | ||
630 | /* Does the pointer reside in either the .got.plt or .plt | |
631 | sections? */ | |
632 | if (within_section (got_plt, address)) | |
633 | msym_section = got_plt; | |
634 | else if (within_section (plt, address)) | |
635 | msym_section = plt; | |
636 | else | |
07be84bf JK |
637 | continue; |
638 | ||
f50776aa PA |
639 | /* We cannot check if NAME is a reference to |
640 | mst_text_gnu_ifunc/mst_data_gnu_ifunc as in OBJFILE the | |
641 | symbol is undefined and the objfile having NAME defined may | |
642 | not yet have been loaded. */ | |
07be84bf | 643 | |
26fcd5d7 TT |
644 | string_buffer.assign (name); |
645 | string_buffer.append (got_suffix, got_suffix + got_suffix_len); | |
07be84bf | 646 | |
31edb802 | 647 | msym = record_minimal_symbol (reader, string_buffer, |
9675da25 TT |
648 | true, unrelocated_addr (address), |
649 | mst_slot_got_plt, msym_section, objfile); | |
07be84bf | 650 | if (msym) |
5bbfd12d | 651 | msym->set_size (ptr_size); |
07be84bf | 652 | } |
07be84bf JK |
653 | } |
654 | ||
655 | /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */ | |
656 | ||
08b8a139 | 657 | static const registry<objfile>::key<htab, htab_deleter> |
8127a2fa | 658 | elf_objfile_gnu_ifunc_cache_data; |
07be84bf JK |
659 | |
660 | /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */ | |
661 | ||
662 | struct elf_gnu_ifunc_cache | |
663 | { | |
664 | /* This is always a function entry address, not a function descriptor. */ | |
665 | CORE_ADDR addr; | |
666 | ||
667 | char name[1]; | |
668 | }; | |
669 | ||
670 | /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */ | |
671 | ||
672 | static hashval_t | |
673 | elf_gnu_ifunc_cache_hash (const void *a_voidp) | |
674 | { | |
9a3c8263 SM |
675 | const struct elf_gnu_ifunc_cache *a |
676 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
07be84bf JK |
677 | |
678 | return htab_hash_string (a->name); | |
679 | } | |
680 | ||
681 | /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */ | |
682 | ||
683 | static int | |
684 | elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp) | |
685 | { | |
9a3c8263 SM |
686 | const struct elf_gnu_ifunc_cache *a |
687 | = (const struct elf_gnu_ifunc_cache *) a_voidp; | |
688 | const struct elf_gnu_ifunc_cache *b | |
689 | = (const struct elf_gnu_ifunc_cache *) b_voidp; | |
07be84bf JK |
690 | |
691 | return strcmp (a->name, b->name) == 0; | |
692 | } | |
693 | ||
694 | /* Record the target function address of a STT_GNU_IFUNC function NAME is the | |
695 | function entry address ADDR. Return 1 if NAME and ADDR are considered as | |
696 | valid and therefore they were successfully recorded, return 0 otherwise. | |
697 | ||
698 | Function does not expect a duplicate entry. Use | |
699 | elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already | |
700 | exists. */ | |
701 | ||
702 | static int | |
703 | elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr) | |
704 | { | |
7cbd4a93 | 705 | struct bound_minimal_symbol msym; |
07be84bf JK |
706 | struct objfile *objfile; |
707 | htab_t htab; | |
708 | struct elf_gnu_ifunc_cache entry_local, *entry_p; | |
709 | void **slot; | |
710 | ||
711 | msym = lookup_minimal_symbol_by_pc (addr); | |
7cbd4a93 | 712 | if (msym.minsym == NULL) |
07be84bf | 713 | return 0; |
4aeddc50 | 714 | if (msym.value_address () != addr) |
07be84bf | 715 | return 0; |
e27d198c | 716 | objfile = msym.objfile; |
07be84bf JK |
717 | |
718 | /* If .plt jumps back to .plt the symbol is still deferred for later | |
1adeb822 | 719 | resolution and it has no use for GDB. */ |
c9d95fa3 | 720 | const char *target_name = msym.minsym->linkage_name (); |
1adeb822 PA |
721 | size_t len = strlen (target_name); |
722 | ||
723 | /* Note we check the symbol's name instead of checking whether the | |
724 | symbol is in the .plt section because some systems have @plt | |
725 | symbols in the .text section. */ | |
726 | if (len > 4 && strcmp (target_name + len - 4, "@plt") == 0) | |
07be84bf JK |
727 | return 0; |
728 | ||
600b5fc2 HL |
729 | if (strcmp (target_name, "_PROCEDURE_LINKAGE_TABLE_") == 0) |
730 | return 0; | |
731 | ||
8127a2fa | 732 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); |
07be84bf JK |
733 | if (htab == NULL) |
734 | { | |
8127a2fa TT |
735 | htab = htab_create_alloc (1, elf_gnu_ifunc_cache_hash, |
736 | elf_gnu_ifunc_cache_eq, | |
737 | NULL, xcalloc, xfree); | |
738 | elf_objfile_gnu_ifunc_cache_data.set (objfile, htab); | |
07be84bf JK |
739 | } |
740 | ||
741 | entry_local.addr = addr; | |
742 | obstack_grow (&objfile->objfile_obstack, &entry_local, | |
743 | offsetof (struct elf_gnu_ifunc_cache, name)); | |
744 | obstack_grow_str0 (&objfile->objfile_obstack, name); | |
224c3ddb SM |
745 | entry_p |
746 | = (struct elf_gnu_ifunc_cache *) obstack_finish (&objfile->objfile_obstack); | |
07be84bf JK |
747 | |
748 | slot = htab_find_slot (htab, entry_p, INSERT); | |
749 | if (*slot != NULL) | |
750 | { | |
9a3c8263 SM |
751 | struct elf_gnu_ifunc_cache *entry_found_p |
752 | = (struct elf_gnu_ifunc_cache *) *slot; | |
08feed99 | 753 | struct gdbarch *gdbarch = objfile->arch (); |
07be84bf JK |
754 | |
755 | if (entry_found_p->addr != addr) | |
756 | { | |
757 | /* This case indicates buggy inferior program, the resolved address | |
758 | should never change. */ | |
759 | ||
760 | warning (_("gnu-indirect-function \"%s\" has changed its resolved " | |
761 | "function_address from %s to %s"), | |
762 | name, paddress (gdbarch, entry_found_p->addr), | |
763 | paddress (gdbarch, addr)); | |
764 | } | |
765 | ||
766 | /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */ | |
767 | } | |
768 | *slot = entry_p; | |
769 | ||
770 | return 1; | |
771 | } | |
772 | ||
773 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
774 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
775 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
776 | ||
777 | Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this | |
778 | function. */ | |
779 | ||
780 | static int | |
781 | elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p) | |
782 | { | |
1dc9084f MM |
783 | int found = 0; |
784 | ||
785 | /* FIXME: we only search the initial namespace. | |
786 | ||
787 | To search other namespaces, we would need to provide context, e.g. in | |
788 | form of an objfile in that namespace. */ | |
789 | gdbarch_iterate_over_objfiles_in_search_order | |
790 | (target_gdbarch (), | |
791 | [name, &addr_p, &found] (struct objfile *objfile) | |
792 | { | |
793 | htab_t htab; | |
794 | elf_gnu_ifunc_cache *entry_p; | |
795 | void **slot; | |
796 | ||
797 | htab = elf_objfile_gnu_ifunc_cache_data.get (objfile); | |
798 | if (htab == NULL) | |
799 | return 0; | |
800 | ||
801 | entry_p = ((elf_gnu_ifunc_cache *) | |
802 | alloca (sizeof (*entry_p) + strlen (name))); | |
803 | strcpy (entry_p->name, name); | |
804 | ||
805 | slot = htab_find_slot (htab, entry_p, NO_INSERT); | |
806 | if (slot == NULL) | |
807 | return 0; | |
808 | entry_p = (elf_gnu_ifunc_cache *) *slot; | |
809 | gdb_assert (entry_p != NULL); | |
810 | ||
811 | if (addr_p) | |
812 | *addr_p = entry_p->addr; | |
813 | ||
814 | found = 1; | |
815 | return 1; | |
816 | }, nullptr); | |
817 | ||
818 | return found; | |
07be84bf JK |
819 | } |
820 | ||
821 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
822 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
823 | is not NULL) and the function returns 1. It returns 0 otherwise. | |
824 | ||
825 | Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. | |
826 | elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to | |
827 | prevent cache entries duplicates. */ | |
828 | ||
829 | static int | |
830 | elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p) | |
831 | { | |
832 | char *name_got_plt; | |
07be84bf | 833 | const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX); |
1dc9084f | 834 | int found = 0; |
07be84bf | 835 | |
224c3ddb | 836 | name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1); |
07be84bf JK |
837 | sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name); |
838 | ||
1dc9084f MM |
839 | /* FIXME: we only search the initial namespace. |
840 | ||
841 | To search other namespaces, we would need to provide context, e.g. in | |
842 | form of an objfile in that namespace. */ | |
843 | gdbarch_iterate_over_objfiles_in_search_order | |
844 | (target_gdbarch (), | |
845 | [name, name_got_plt, &addr_p, &found] (struct objfile *objfile) | |
846 | { | |
847 | bfd *obfd = objfile->obfd.get (); | |
848 | struct gdbarch *gdbarch = objfile->arch (); | |
849 | type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; | |
850 | size_t ptr_size = ptr_type->length (); | |
851 | CORE_ADDR pointer_address, addr; | |
852 | asection *plt; | |
853 | gdb_byte *buf = (gdb_byte *) alloca (ptr_size); | |
854 | bound_minimal_symbol msym; | |
855 | ||
856 | msym = lookup_minimal_symbol (name_got_plt, NULL, objfile); | |
857 | if (msym.minsym == NULL) | |
858 | return 0; | |
859 | if (msym.minsym->type () != mst_slot_got_plt) | |
860 | return 0; | |
861 | pointer_address = msym.value_address (); | |
862 | ||
863 | plt = bfd_get_section_by_name (obfd, ".plt"); | |
864 | if (plt == NULL) | |
865 | return 0; | |
866 | ||
867 | if (msym.minsym->size () != ptr_size) | |
868 | return 0; | |
869 | if (target_read_memory (pointer_address, buf, ptr_size) != 0) | |
870 | return 0; | |
871 | addr = extract_typed_address (buf, ptr_type); | |
872 | addr = gdbarch_convert_from_func_ptr_addr | |
873 | (gdbarch, addr, current_inferior ()->top_target ()); | |
874 | addr = gdbarch_addr_bits_remove (gdbarch, addr); | |
875 | ||
876 | if (elf_gnu_ifunc_record_cache (name, addr)) | |
877 | { | |
878 | if (addr_p != NULL) | |
879 | *addr_p = addr; | |
880 | ||
881 | found = 1; | |
882 | return 1; | |
883 | } | |
884 | ||
885 | return 0; | |
886 | }, nullptr); | |
887 | ||
888 | return found; | |
07be84bf JK |
889 | } |
890 | ||
891 | /* Try to find the target resolved function entry address of a STT_GNU_IFUNC | |
892 | function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P | |
ececd218 | 893 | is not NULL) and the function returns true. It returns false otherwise. |
07be84bf JK |
894 | |
895 | Both the elf_objfile_gnu_ifunc_cache_data hash table and | |
896 | SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */ | |
897 | ||
ececd218 | 898 | static bool |
07be84bf JK |
899 | elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p) |
900 | { | |
901 | if (elf_gnu_ifunc_resolve_by_cache (name, addr_p)) | |
ececd218 | 902 | return true; |
dea91a5c | 903 | |
07be84bf | 904 | if (elf_gnu_ifunc_resolve_by_got (name, addr_p)) |
ececd218 | 905 | return true; |
07be84bf | 906 | |
ececd218 | 907 | return false; |
07be84bf JK |
908 | } |
909 | ||
910 | /* Call STT_GNU_IFUNC - a function returning addresss of a real function to | |
911 | call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned | |
912 | is the entry point of the resolved STT_GNU_IFUNC target function to call. | |
913 | */ | |
914 | ||
915 | static CORE_ADDR | |
916 | elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) | |
917 | { | |
2c02bd72 | 918 | const char *name_at_pc; |
07be84bf JK |
919 | CORE_ADDR start_at_pc, address; |
920 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
921 | struct value *function, *address_val; | |
e1b2624a AA |
922 | CORE_ADDR hwcap = 0; |
923 | struct value *hwcap_val; | |
07be84bf JK |
924 | |
925 | /* Try first any non-intrusive methods without an inferior call. */ | |
926 | ||
927 | if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL) | |
928 | && start_at_pc == pc) | |
929 | { | |
930 | if (elf_gnu_ifunc_resolve_name (name_at_pc, &address)) | |
931 | return address; | |
932 | } | |
933 | else | |
934 | name_at_pc = NULL; | |
935 | ||
317c3ed9 | 936 | function = value::allocate (func_func_type); |
6f9c9d71 | 937 | function->set_lval (lval_memory); |
9feb2d07 | 938 | function->set_address (pc); |
07be84bf | 939 | |
e1b2624a AA |
940 | /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as |
941 | parameter. FUNCTION is the function entry address. ADDRESS may be a | |
942 | function descriptor. */ | |
07be84bf | 943 | |
82d23ca8 | 944 | target_auxv_search (AT_HWCAP, &hwcap); |
e1b2624a AA |
945 | hwcap_val = value_from_longest (builtin_type (gdbarch) |
946 | ->builtin_unsigned_long, hwcap); | |
e71585ff | 947 | address_val = call_function_by_hand (function, NULL, hwcap_val); |
07be84bf | 948 | address = value_as_address (address_val); |
328d42d8 SM |
949 | address = gdbarch_convert_from_func_ptr_addr |
950 | (gdbarch, address, current_inferior ()->top_target ()); | |
4b7d1f7f | 951 | address = gdbarch_addr_bits_remove (gdbarch, address); |
07be84bf JK |
952 | |
953 | if (name_at_pc) | |
954 | elf_gnu_ifunc_record_cache (name_at_pc, address); | |
955 | ||
956 | return address; | |
957 | } | |
958 | ||
0e30163f JK |
959 | /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ |
960 | ||
961 | static void | |
74421c0b | 962 | elf_gnu_ifunc_resolver_stop (code_breakpoint *b) |
0e30163f JK |
963 | { |
964 | struct breakpoint *b_return; | |
bd2b40ac | 965 | frame_info_ptr prev_frame = get_prev_frame (get_current_frame ()); |
0e30163f JK |
966 | struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); |
967 | CORE_ADDR prev_pc = get_frame_pc (prev_frame); | |
00431a78 | 968 | int thread_id = inferior_thread ()->global_num; |
0e30163f JK |
969 | |
970 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
971 | ||
972 | for (b_return = b->related_breakpoint; b_return != b; | |
973 | b_return = b_return->related_breakpoint) | |
974 | { | |
975 | gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); | |
9dc1523b | 976 | gdb_assert (b_return->has_single_location ()); |
0e30163f JK |
977 | gdb_assert (frame_id_p (b_return->frame_id)); |
978 | ||
979 | if (b_return->thread == thread_id | |
f5951b9f | 980 | && b_return->first_loc ().requested_address == prev_pc |
a0cbd650 | 981 | && b_return->frame_id == prev_frame_id) |
0e30163f JK |
982 | break; |
983 | } | |
984 | ||
985 | if (b_return == b) | |
986 | { | |
0e30163f JK |
987 | /* No need to call find_pc_line for symbols resolving as this is only |
988 | a helper breakpointer never shown to the user. */ | |
989 | ||
51abb421 | 990 | symtab_and_line sal; |
0e30163f JK |
991 | sal.pspace = current_inferior ()->pspace; |
992 | sal.pc = prev_pc; | |
993 | sal.section = find_pc_overlay (sal.pc); | |
994 | sal.explicit_pc = 1; | |
454dafbd TT |
995 | b_return |
996 | = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, | |
997 | prev_frame_id, | |
998 | bp_gnu_ifunc_resolver_return).release (); | |
0e30163f | 999 | |
c70a6932 JK |
1000 | /* set_momentary_breakpoint invalidates PREV_FRAME. */ |
1001 | prev_frame = NULL; | |
1002 | ||
0e30163f JK |
1003 | /* Add new b_return to the ring list b->related_breakpoint. */ |
1004 | gdb_assert (b_return->related_breakpoint == b_return); | |
1005 | b_return->related_breakpoint = b->related_breakpoint; | |
1006 | b->related_breakpoint = b_return; | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ | |
1011 | ||
1012 | static void | |
74421c0b | 1013 | elf_gnu_ifunc_resolver_return_stop (code_breakpoint *b) |
0e30163f | 1014 | { |
00431a78 | 1015 | thread_info *thread = inferior_thread (); |
0e30163f JK |
1016 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
1017 | struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; | |
27710edb | 1018 | struct type *value_type = func_func_type->target_type (); |
00431a78 | 1019 | struct regcache *regcache = get_thread_regcache (thread); |
6a3a010b | 1020 | struct value *func_func; |
0e30163f JK |
1021 | struct value *value; |
1022 | CORE_ADDR resolved_address, resolved_pc; | |
0e30163f JK |
1023 | |
1024 | gdb_assert (b->type == bp_gnu_ifunc_resolver_return); | |
1025 | ||
0e30163f JK |
1026 | while (b->related_breakpoint != b) |
1027 | { | |
1028 | struct breakpoint *b_next = b->related_breakpoint; | |
1029 | ||
1030 | switch (b->type) | |
1031 | { | |
1032 | case bp_gnu_ifunc_resolver: | |
1033 | break; | |
1034 | case bp_gnu_ifunc_resolver_return: | |
1035 | delete_breakpoint (b); | |
1036 | break; | |
1037 | default: | |
f34652de | 1038 | internal_error (_("handle_inferior_event: Invalid " |
0e30163f JK |
1039 | "gnu-indirect-function breakpoint type %d"), |
1040 | (int) b->type); | |
1041 | } | |
74421c0b | 1042 | b = (code_breakpoint *) b_next; |
0e30163f JK |
1043 | } |
1044 | gdb_assert (b->type == bp_gnu_ifunc_resolver); | |
9dc1523b | 1045 | gdb_assert (b->has_single_location ()); |
6a3a010b | 1046 | |
317c3ed9 | 1047 | func_func = value::allocate (func_func_type); |
6f9c9d71 | 1048 | func_func->set_lval (lval_memory); |
f5951b9f | 1049 | func_func->set_address (b->first_loc ().related_address); |
6a3a010b | 1050 | |
317c3ed9 | 1051 | value = value::allocate (value_type); |
4e1d2f58 TT |
1052 | gdbarch_return_value_as_value (gdbarch, func_func, value_type, regcache, |
1053 | &value, NULL); | |
6a3a010b | 1054 | resolved_address = value_as_address (value); |
328d42d8 SM |
1055 | resolved_pc = gdbarch_convert_from_func_ptr_addr |
1056 | (gdbarch, resolved_address, current_inferior ()->top_target ()); | |
4b7d1f7f | 1057 | resolved_pc = gdbarch_addr_bits_remove (gdbarch, resolved_pc); |
0e30163f | 1058 | |
f8eba3c6 | 1059 | gdb_assert (current_program_space == b->pspace || b->pspace == NULL); |
709438c7 | 1060 | elf_gnu_ifunc_record_cache (b->locspec->to_string (), resolved_pc); |
0e30163f | 1061 | |
0e30163f | 1062 | b->type = bp_breakpoint; |
6c5b2ebe | 1063 | update_breakpoint_locations (b, current_program_space, |
79188d8d PA |
1064 | find_function_start_sal (resolved_pc, NULL, true), |
1065 | {}); | |
0e30163f JK |
1066 | } |
1067 | ||
2750ef27 TT |
1068 | /* A helper function for elf_symfile_read that reads the minimal |
1069 | symbols. */ | |
c906108c SS |
1070 | |
1071 | static void | |
5f6cac40 TT |
1072 | elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags, |
1073 | const struct elfinfo *ei) | |
c906108c | 1074 | { |
98badbfd | 1075 | bfd *synth_abfd, *abfd = objfile->obfd.get (); |
62553543 EZ |
1076 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
1077 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
1078 | asymbol *synthsyms; | |
c906108c | 1079 | |
2ab317fb SM |
1080 | symtab_create_debug_printf ("reading minimal symbols of objfile %s", |
1081 | objfile_name (objfile)); | |
45cfd468 | 1082 | |
5f6cac40 TT |
1083 | /* If we already have minsyms, then we can skip some work here. |
1084 | However, if there were stabs or mdebug sections, we go ahead and | |
1085 | redo all the work anyway, because the psym readers for those | |
1086 | kinds of debuginfo need extra information found here. This can | |
1087 | go away once all types of symbols are in the per-BFD object. */ | |
1088 | if (objfile->per_bfd->minsyms_read | |
1089 | && ei->stabsect == NULL | |
30d1f018 WP |
1090 | && ei->mdebugsect == NULL |
1091 | && ei->ctfsect == NULL) | |
5f6cac40 | 1092 | { |
2ab317fb | 1093 | symtab_create_debug_printf ("minimal symbols were previously read"); |
5f6cac40 TT |
1094 | return; |
1095 | } | |
1096 | ||
d25e8719 | 1097 | minimal_symbol_reader reader (objfile); |
c906108c | 1098 | |
18a94d75 | 1099 | /* Process the normal ELF symbol table first. */ |
c906108c | 1100 | |
98badbfd | 1101 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd.get ()); |
62553543 | 1102 | if (storage_needed < 0) |
3e43a32a | 1103 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1104 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1105 | bfd_errmsg (bfd_get_error ())); |
1106 | ||
1107 | if (storage_needed > 0) | |
1108 | { | |
80c57053 JK |
1109 | /* Memory gets permanently referenced from ABFD after |
1110 | bfd_canonicalize_symtab so it must not get freed before ABFD gets. */ | |
1111 | ||
224c3ddb | 1112 | symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
98badbfd | 1113 | symcount = bfd_canonicalize_symtab (objfile->obfd.get (), symbol_table); |
62553543 EZ |
1114 | |
1115 | if (symcount < 0) | |
3e43a32a | 1116 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1117 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1118 | bfd_errmsg (bfd_get_error ())); |
1119 | ||
ce6c454e TT |
1120 | elf_symtab_read (reader, objfile, ST_REGULAR, symcount, symbol_table, |
1121 | false); | |
62553543 | 1122 | } |
c906108c SS |
1123 | |
1124 | /* Add the dynamic symbols. */ | |
1125 | ||
98badbfd | 1126 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd.get ()); |
62553543 EZ |
1127 | |
1128 | if (storage_needed > 0) | |
1129 | { | |
3f1eff0a JK |
1130 | /* Memory gets permanently referenced from ABFD after |
1131 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
1132 | It happens only in the case when elf_slurp_reloc_table sees | |
1133 | asection->relocation NULL. Determining which section is asection is | |
1134 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
1135 | implementation detail, though. */ | |
1136 | ||
224c3ddb | 1137 | dyn_symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed); |
98badbfd | 1138 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd.get (), |
62553543 EZ |
1139 | dyn_symbol_table); |
1140 | ||
1141 | if (dynsymcount < 0) | |
3e43a32a | 1142 | error (_("Can't read symbols from %s: %s"), |
98badbfd | 1143 | bfd_get_filename (objfile->obfd.get ()), |
62553543 EZ |
1144 | bfd_errmsg (bfd_get_error ())); |
1145 | ||
8dddcb8f | 1146 | elf_symtab_read (reader, objfile, ST_DYNAMIC, dynsymcount, |
ce6c454e | 1147 | dyn_symbol_table, false); |
07be84bf | 1148 | |
8dddcb8f | 1149 | elf_rel_plt_read (reader, objfile, dyn_symbol_table); |
62553543 EZ |
1150 | } |
1151 | ||
63524580 JK |
1152 | /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from |
1153 | elfutils (eu-strip) moves even the .symtab section into the .debug file. | |
1154 | ||
1155 | bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol | |
1156 | 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code | |
1157 | address. But with eu-strip files bfd_get_synthetic_symtab would fail to | |
1158 | read the code address from .opd while it reads the .symtab section from | |
1159 | a separate debug info file as the .opd section is SHT_NOBITS there. | |
1160 | ||
1161 | With SYNTH_ABFD the .opd section will be read from the original | |
1162 | backlinked binary where it is valid. */ | |
1163 | ||
1164 | if (objfile->separate_debug_objfile_backlink) | |
98badbfd | 1165 | synth_abfd = objfile->separate_debug_objfile_backlink->obfd.get (); |
63524580 JK |
1166 | else |
1167 | synth_abfd = abfd; | |
1168 | ||
62553543 EZ |
1169 | /* Add synthetic symbols - for instance, names for any PLT entries. */ |
1170 | ||
63524580 | 1171 | synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table, |
62553543 EZ |
1172 | dynsymcount, dyn_symbol_table, |
1173 | &synthsyms); | |
1174 | if (synthcount > 0) | |
1175 | { | |
62553543 EZ |
1176 | long i; |
1177 | ||
b22e99fd | 1178 | std::unique_ptr<asymbol *[]> |
d1e4a624 | 1179 | synth_symbol_table (new asymbol *[synthcount]); |
62553543 | 1180 | for (i = 0; i < synthcount; i++) |
9f20e3da | 1181 | synth_symbol_table[i] = synthsyms + i; |
8dddcb8f | 1182 | elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount, |
ce6c454e | 1183 | synth_symbol_table.get (), true); |
ba713918 AL |
1184 | |
1185 | xfree (synthsyms); | |
1186 | synthsyms = NULL; | |
62553543 | 1187 | } |
c906108c | 1188 | |
7134143f DJ |
1189 | /* Install any minimal symbols that have been collected as the current |
1190 | minimal symbols for this objfile. The debug readers below this point | |
1191 | should not generate new minimal symbols; if they do it's their | |
1192 | responsibility to install them. "mdebug" appears to be the only one | |
1193 | which will do this. */ | |
1194 | ||
d25e8719 | 1195 | reader.install (); |
7134143f | 1196 | |
2ab317fb | 1197 | symtab_create_debug_printf ("done reading minimal symbols"); |
2750ef27 TT |
1198 | } |
1199 | ||
d955d179 TV |
1200 | /* Dwarf-specific helper for elf_symfile_read. Return true if we managed to |
1201 | load dwarf debug info. */ | |
1202 | ||
1203 | static bool | |
1204 | elf_symfile_read_dwarf2 (struct objfile *objfile, | |
1205 | symfile_add_flags symfile_flags) | |
1206 | { | |
1207 | bool has_dwarf2 = true; | |
1208 | ||
1209 | if (dwarf2_has_info (objfile, NULL, true)) | |
1210 | dwarf2_initialize_objfile (objfile); | |
1211 | /* If the file has its own symbol tables it has no separate debug | |
1212 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
1213 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
1214 | `.note.gnu.build-id'. | |
1215 | ||
1216 | .gnu_debugdata is !objfile::has_partial_symbols because it contains only | |
1217 | .symtab, not .debug_* section. But if we already added .gnu_debugdata as | |
1218 | an objfile via find_separate_debug_file_in_section there was no separate | |
1219 | debug info available. Therefore do not attempt to search for another one, | |
1220 | objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to | |
1221 | be NULL and we would possibly violate it. */ | |
1222 | ||
1223 | else if (!objfile->has_partial_symbols () | |
1224 | && objfile->separate_debug_objfile == NULL | |
1225 | && objfile->separate_debug_objfile_backlink == NULL) | |
1226 | { | |
34f997c8 | 1227 | deferred_warnings warnings; |
6647f05d AH |
1228 | |
1229 | std::string debugfile | |
34f997c8 | 1230 | = find_separate_debug_file_by_buildid (objfile, &warnings); |
d955d179 TV |
1231 | |
1232 | if (debugfile.empty ()) | |
34f997c8 | 1233 | debugfile = find_separate_debug_file_by_debuglink (objfile, &warnings); |
d955d179 TV |
1234 | |
1235 | if (!debugfile.empty ()) | |
1236 | { | |
f96328ac TT |
1237 | gdb_bfd_ref_ptr debug_bfd |
1238 | (symfile_bfd_open_no_error (debugfile.c_str ())); | |
d955d179 | 1239 | |
f96328ac TT |
1240 | if (debug_bfd != nullptr) |
1241 | symbol_file_add_separate (debug_bfd, debugfile.c_str (), | |
1242 | symfile_flags, objfile); | |
d955d179 TV |
1243 | } |
1244 | else | |
1245 | { | |
1246 | has_dwarf2 = false; | |
1247 | const struct bfd_build_id *build_id | |
1248 | = build_id_bfd_get (objfile->obfd.get ()); | |
1249 | const char *filename = bfd_get_filename (objfile->obfd.get ()); | |
1250 | ||
1251 | if (build_id != nullptr) | |
1252 | { | |
1253 | gdb::unique_xmalloc_ptr<char> symfile_path; | |
1254 | scoped_fd fd (debuginfod_debuginfo_query (build_id->data, | |
1255 | build_id->size, | |
1256 | filename, | |
1257 | &symfile_path)); | |
1258 | ||
1259 | if (fd.get () >= 0) | |
1260 | { | |
1261 | /* File successfully retrieved from server. */ | |
f96328ac TT |
1262 | gdb_bfd_ref_ptr debug_bfd |
1263 | (symfile_bfd_open_no_error (symfile_path.get ())); | |
d955d179 | 1264 | |
f96328ac TT |
1265 | if (debug_bfd != nullptr |
1266 | && build_id_verify (debug_bfd.get (), build_id->size, | |
1267 | build_id->data)) | |
d955d179 TV |
1268 | { |
1269 | symbol_file_add_separate (debug_bfd, symfile_path.get (), | |
1270 | symfile_flags, objfile); | |
1271 | has_dwarf2 = true; | |
1272 | } | |
1273 | } | |
1274 | } | |
1275 | } | |
34f997c8 AB |
1276 | /* If all the methods to collect the debuginfo failed, print the |
1277 | warnings, this is a no-op if there are no warnings. */ | |
1278 | if (debugfile.empty () && !has_dwarf2) | |
1279 | warnings.emit (); | |
d955d179 TV |
1280 | } |
1281 | ||
1282 | return has_dwarf2; | |
1283 | } | |
1284 | ||
2750ef27 TT |
1285 | /* Scan and build partial symbols for a symbol file. |
1286 | We have been initialized by a call to elf_symfile_init, which | |
1287 | currently does nothing. | |
1288 | ||
2750ef27 TT |
1289 | This function only does the minimum work necessary for letting the |
1290 | user "name" things symbolically; it does not read the entire symtab. | |
1291 | Instead, it reads the external and static symbols and puts them in partial | |
1292 | symbol tables. When more extensive information is requested of a | |
1293 | file, the corresponding partial symbol table is mutated into a full | |
1294 | fledged symbol table by going back and reading the symbols | |
1295 | for real. | |
1296 | ||
1297 | We look for sections with specific names, to tell us what debug | |
1298 | format to look for: FIXME!!! | |
1299 | ||
1300 | elfstab_build_psymtabs() handles STABS symbols; | |
1301 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
1302 | ||
1303 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
1304 | like a COFF symbol table, but has only the minimal information necessary | |
1305 | for linking. We process this also, and use the information to | |
1306 | build gdb's minimal symbol table. This gives us some minimal debugging | |
1307 | capability even for files compiled without -g. */ | |
1308 | ||
1309 | static void | |
b15cc25c | 1310 | elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
2750ef27 | 1311 | { |
98badbfd | 1312 | bfd *abfd = objfile->obfd.get (); |
2750ef27 TT |
1313 | struct elfinfo ei; |
1314 | ||
2750ef27 | 1315 | memset ((char *) &ei, 0, sizeof (ei)); |
97cbe998 | 1316 | if (!(objfile->flags & OBJF_READNEVER)) |
08f93a1a TT |
1317 | { |
1318 | for (asection *sect : gdb_bfd_sections (abfd)) | |
1319 | elf_locate_sections (sect, &ei); | |
1320 | } | |
c906108c | 1321 | |
5f6cac40 TT |
1322 | elf_read_minimal_symbols (objfile, symfile_flags, &ei); |
1323 | ||
c906108c SS |
1324 | /* ELF debugging information is inserted into the psymtab in the |
1325 | order of least informative first - most informative last. Since | |
1326 | the psymtab table is searched `most recent insertion first' this | |
1327 | increases the probability that more detailed debug information | |
1328 | for a section is found. | |
1329 | ||
1330 | For instance, an object file might contain both .mdebug (XCOFF) | |
1331 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
1332 | (searched last) and DWARF2 is inserted last (searched first). If | |
1333 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 1334 | an included file XCOFF info is useless. */ |
c906108c SS |
1335 | |
1336 | if (ei.mdebugsect) | |
1337 | { | |
1338 | const struct ecoff_debug_swap *swap; | |
1339 | ||
1340 | /* .mdebug section, presumably holding ECOFF debugging | |
dda83cd7 | 1341 | information. */ |
c906108c SS |
1342 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
1343 | if (swap) | |
d4f3574e | 1344 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
1345 | } |
1346 | if (ei.stabsect) | |
1347 | { | |
1348 | asection *str_sect; | |
1349 | ||
1350 | /* Stab sections have an associated string table that looks like | |
dda83cd7 | 1351 | a separate section. */ |
c906108c SS |
1352 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
1353 | ||
1354 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
1355 | if (str_sect) | |
1356 | elfstab_build_psymtabs (objfile, | |
086df311 | 1357 | ei.stabsect, |
c906108c | 1358 | str_sect->filepos, |
fd361982 | 1359 | bfd_section_size (str_sect)); |
c906108c | 1360 | } |
9291a0cd | 1361 | |
0d5adb56 TV |
1362 | /* Read the CTF section only if there is no DWARF info. */ |
1363 | if (always_read_ctf && ei.ctfsect) | |
1364 | { | |
1365 | elfctf_build_psymtabs (objfile); | |
1366 | } | |
1367 | ||
d955d179 | 1368 | bool has_dwarf2 = elf_symfile_read_dwarf2 (objfile, symfile_flags); |
30d1f018 WP |
1369 | |
1370 | /* Read the CTF section only if there is no DWARF info. */ | |
0d5adb56 | 1371 | if (!always_read_ctf && !has_dwarf2 && ei.ctfsect) |
30d1f018 WP |
1372 | { |
1373 | elfctf_build_psymtabs (objfile); | |
9cce227f | 1374 | } |
c906108c SS |
1375 | } |
1376 | ||
c906108c SS |
1377 | /* Initialize anything that needs initializing when a completely new symbol |
1378 | file is specified (not just adding some symbols from another file, e.g. a | |
caa429d8 | 1379 | shared library). */ |
c906108c SS |
1380 | |
1381 | static void | |
fba45db2 | 1382 | elf_new_init (struct objfile *ignore) |
c906108c | 1383 | { |
c906108c SS |
1384 | } |
1385 | ||
1386 | /* Perform any local cleanups required when we are done with a particular | |
1387 | objfile. I.E, we are in the process of discarding all symbol information | |
1388 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 1389 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
1390 | |
1391 | static void | |
fba45db2 | 1392 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 1393 | { |
c906108c SS |
1394 | } |
1395 | ||
db7a9bcd | 1396 | /* ELF specific initialization routine for reading symbols. */ |
c906108c SS |
1397 | |
1398 | static void | |
fba45db2 | 1399 | elf_symfile_init (struct objfile *objfile) |
c906108c | 1400 | { |
c906108c SS |
1401 | } |
1402 | ||
55aa24fb SDJ |
1403 | /* Implementation of `sym_get_probes', as documented in symfile.h. */ |
1404 | ||
814cf43a | 1405 | static const elfread_data & |
55aa24fb SDJ |
1406 | elf_get_probes (struct objfile *objfile) |
1407 | { | |
98badbfd | 1408 | elfread_data *probes_per_bfd = probe_key.get (objfile->obfd.get ()); |
55aa24fb | 1409 | |
aaa63a31 | 1410 | if (probes_per_bfd == NULL) |
55aa24fb | 1411 | { |
98badbfd | 1412 | probes_per_bfd = probe_key.emplace (objfile->obfd.get ()); |
55aa24fb SDJ |
1413 | |
1414 | /* Here we try to gather information about all types of probes from the | |
1415 | objfile. */ | |
935676c9 | 1416 | for (const static_probe_ops *ops : all_static_probe_ops) |
0782db84 | 1417 | ops->get_probes (probes_per_bfd, objfile); |
55aa24fb SDJ |
1418 | } |
1419 | ||
aaa63a31 | 1420 | return *probes_per_bfd; |
55aa24fb SDJ |
1421 | } |
1422 | ||
c906108c | 1423 | \f |
55aa24fb SDJ |
1424 | |
1425 | /* Implementation `sym_probe_fns', as documented in symfile.h. */ | |
1426 | ||
1427 | static const struct sym_probe_fns elf_probe_fns = | |
1428 | { | |
25f9533e | 1429 | elf_get_probes, /* sym_get_probes */ |
55aa24fb SDJ |
1430 | }; |
1431 | ||
c906108c SS |
1432 | /* Register that we are able to handle ELF object file formats. */ |
1433 | ||
00b5771c | 1434 | static const struct sym_fns elf_sym_fns = |
c906108c | 1435 | { |
3e43a32a MS |
1436 | elf_new_init, /* init anything gbl to entire symtab */ |
1437 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1438 | elf_symfile_read, /* read a symbol file into symtab */ | |
1439 | elf_symfile_finish, /* finished with file, cleanup */ | |
1440 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1441 | elf_symfile_segments, /* Get segment information from a file. */ | |
1442 | NULL, | |
1443 | default_symfile_relocate, /* Relocate a debug section. */ | |
55aa24fb | 1444 | &elf_probe_fns, /* sym_probe_fns */ |
927aa2e7 JK |
1445 | }; |
1446 | ||
07be84bf JK |
1447 | /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */ |
1448 | ||
1449 | static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = | |
1450 | { | |
1451 | elf_gnu_ifunc_resolve_addr, | |
1452 | elf_gnu_ifunc_resolve_name, | |
0e30163f JK |
1453 | elf_gnu_ifunc_resolver_stop, |
1454 | elf_gnu_ifunc_resolver_return_stop | |
07be84bf JK |
1455 | }; |
1456 | ||
6c265988 | 1457 | void _initialize_elfread (); |
c906108c | 1458 | void |
6c265988 | 1459 | _initialize_elfread () |
c906108c | 1460 | { |
c256e171 | 1461 | add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns); |
07be84bf | 1462 | |
07be84bf | 1463 | gnu_ifunc_fns_p = &elf_gnu_ifunc_fns; |
0d5adb56 TV |
1464 | |
1465 | /* Add "set always-read-ctf on/off". */ | |
1466 | add_setshow_boolean_cmd ("always-read-ctf", class_support, &always_read_ctf, | |
1467 | _("\ | |
1468 | Set whether CTF is always read."), | |
1469 | _("\ | |
1470 | Show whether CTF is always read."), | |
1471 | _("\ | |
1472 | When off, CTF is only read if DWARF is not present. When on, CTF is read\ | |
1473 | regardless of whether DWARF is present."), | |
1474 | nullptr /* set_func */, nullptr /* show_func */, | |
1475 | &setlist, &showlist); | |
c906108c | 1476 | } |