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/tmp/gdb-8.1/gdb/elfread.c
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1 /* Read ELF (Executable and Linking Format) object files for GDB.
2
3 Copyright (C) 1991-2018 Free Software Foundation, Inc.
4
5 Written by Fred Fish at Cygnus Support.
6
7 This file is part of GDB.
8
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
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
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.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22 #include "defs.h"
23 #include "bfd.h"
24 #include "elf-bfd.h"
25 #include "elf/common.h"
26 #include "elf/internal.h"
27 #include "elf/mips.h"
28 #include "symtab.h"
29 #include "symfile.h"
30 #include "objfiles.h"
31 #include "buildsym.h"
32 #include "stabsread.h"
33 #include "gdb-stabs.h"
34 #include "complaints.h"
35 #include "demangle.h"
36 #include "psympriv.h"
37 #include "filenames.h"
38 #include "probe.h"
39 #include "arch-utils.h"
40 #include "gdbtypes.h"
41 #include "value.h"
42 #include "infcall.h"
43 #include "gdbthread.h"
44 #include "regcache.h"
45 #include "bcache.h"
46 #include "gdb_bfd.h"
47 #include "build-id.h"
48 #include "location.h"
49 #include "auxv.h"
50
51 /* Forward declarations. */
52 extern const struct sym_fns elf_sym_fns_gdb_index;
53 extern const struct sym_fns elf_sym_fns_debug_names;
54 extern const struct sym_fns elf_sym_fns_lazy_psyms;
55
56 /* The struct elfinfo is available only during ELF symbol table and
57 psymtab reading. It is destroyed at the completion of psymtab-reading.
58 It's local to elf_symfile_read. */
59
60 struct elfinfo
61 {
62 asection *stabsect; /* Section pointer for .stab section */
63 asection *mdebugsect; /* Section pointer for .mdebug section */
64 };
65
66 /* Per-BFD data for probe info. */
67
68 static const struct bfd_data *probe_key = NULL;
69
70 /* Minimal symbols located at the GOT entries for .plt - that is the real
71 pointer where the given entry will jump to. It gets updated by the real
72 function address during lazy ld.so resolving in the inferior. These
73 minimal symbols are indexed for <tab>-completion. */
74
75 #define SYMBOL_GOT_PLT_SUFFIX "@got.plt"
76
77 /* Locate the segments in ABFD. */
78
79 static struct symfile_segment_data *
80 elf_symfile_segments (bfd *abfd)
81 {
82 Elf_Internal_Phdr *phdrs, **segments;
83 long phdrs_size;
84 int num_phdrs, num_segments, num_sections, i;
85 asection *sect;
86 struct symfile_segment_data *data;
87
88 phdrs_size = bfd_get_elf_phdr_upper_bound (abfd);
89 if (phdrs_size == -1)
90 return NULL;
91
92 phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size);
93 num_phdrs = bfd_get_elf_phdrs (abfd, phdrs);
94 if (num_phdrs == -1)
95 return NULL;
96
97 num_segments = 0;
98 segments = XALLOCAVEC (Elf_Internal_Phdr *, num_phdrs);
99 for (i = 0; i < num_phdrs; i++)
100 if (phdrs[i].p_type == PT_LOAD)
101 segments[num_segments++] = &phdrs[i];
102
103 if (num_segments == 0)
104 return NULL;
105
106 data = XCNEW (struct symfile_segment_data);
107 data->num_segments = num_segments;
108 data->segment_bases = XCNEWVEC (CORE_ADDR, num_segments);
109 data->segment_sizes = XCNEWVEC (CORE_ADDR, num_segments);
110
111 for (i = 0; i < num_segments; i++)
112 {
113 data->segment_bases[i] = segments[i]->p_vaddr;
114 data->segment_sizes[i] = segments[i]->p_memsz;
115 }
116
117 num_sections = bfd_count_sections (abfd);
118 data->segment_info = XCNEWVEC (int, num_sections);
119
120 for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
121 {
122 int j;
123 CORE_ADDR vma;
124
125 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
126 continue;
127
128 vma = bfd_get_section_vma (abfd, sect);
129
130 for (j = 0; j < num_segments; j++)
131 if (segments[j]->p_memsz > 0
132 && vma >= segments[j]->p_vaddr
133 && (vma - segments[j]->p_vaddr) < segments[j]->p_memsz)
134 {
135 data->segment_info[i] = j + 1;
136 break;
137 }
138
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. */
148 if (bfd_get_section_size (sect) > 0 && j == num_segments
149 && (bfd_get_section_flags (abfd, sect) & SEC_LOAD) != 0)
150 warning (_("Loadable section \"%s\" outside of ELF segments"),
151 bfd_section_name (abfd, sect));
152 }
153
154 return data;
155 }
156
157 /* We are called once per section from elf_symfile_read. We
158 need to examine each section we are passed, check to see
159 if it is something we are interested in processing, and
160 if so, stash away some access information for the section.
161
162 For now we recognize the dwarf debug information sections and
163 line number sections from matching their section names. The
164 ELF definition is no real help here since it has no direct
165 knowledge of DWARF (by design, so any debugging format can be
166 used).
167
168 We also recognize the ".stab" sections used by the Sun compilers
169 released with Solaris 2.
170
171 FIXME: The section names should not be hardwired strings (what
172 should they be? I don't think most object file formats have enough
173 section flags to specify what kind of debug section it is.
174 -kingdon). */
175
176 static void
177 elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip)
178 {
179 struct elfinfo *ei;
180
181 ei = (struct elfinfo *) eip;
182 if (strcmp (sectp->name, ".stab") == 0)
183 {
184 ei->stabsect = sectp;
185 }
186 else if (strcmp (sectp->name, ".mdebug") == 0)
187 {
188 ei->mdebugsect = sectp;
189 }
190 }
191
192 static struct minimal_symbol *
193 record_minimal_symbol (minimal_symbol_reader &reader,
194 const char *name, int name_len, bool copy_name,
195 CORE_ADDR address,
196 enum minimal_symbol_type ms_type,
197 asection *bfd_section, struct objfile *objfile)
198 {
199 struct gdbarch *gdbarch = get_objfile_arch (objfile);
200
201 if (ms_type == mst_text || ms_type == mst_file_text
202 || ms_type == mst_text_gnu_ifunc)
203 address = gdbarch_addr_bits_remove (gdbarch, address);
204
205 return reader.record_full (name, name_len, copy_name, address,
206 ms_type,
207 gdb_bfd_section_index (objfile->obfd,
208 bfd_section));
209 }
210
211 /* Read the symbol table of an ELF file.
212
213 Given an objfile, a symbol table, and a flag indicating whether the
214 symbol table contains regular, dynamic, or synthetic symbols, add all
215 the global function and data symbols to the minimal symbol table.
216
217 In stabs-in-ELF, as implemented by Sun, there are some local symbols
218 defined in the ELF symbol table, which can be used to locate
219 the beginnings of sections from each ".o" file that was linked to
220 form the executable objfile. We gather any such info and record it
221 in data structures hung off the objfile's private data. */
222
223 #define ST_REGULAR 0
224 #define ST_DYNAMIC 1
225 #define ST_SYNTHETIC 2
226
227 static void
228 elf_symtab_read (minimal_symbol_reader &reader,
229 struct objfile *objfile, int type,
230 long number_of_symbols, asymbol **symbol_table,
231 bool copy_names)
232 {
233 struct gdbarch *gdbarch = get_objfile_arch (objfile);
234 asymbol *sym;
235 long i;
236 CORE_ADDR symaddr;
237 enum minimal_symbol_type ms_type;
238 /* Name of the last file symbol. This is either a constant string or is
239 saved on the objfile's filename cache. */
240 const char *filesymname = "";
241 int stripped = (bfd_get_symcount (objfile->obfd) == 0);
242 int elf_make_msymbol_special_p
243 = gdbarch_elf_make_msymbol_special_p (gdbarch);
244
245 for (i = 0; i < number_of_symbols; i++)
246 {
247 sym = symbol_table[i];
248 if (sym->name == NULL || *sym->name == '\0')
249 {
250 /* Skip names that don't exist (shouldn't happen), or names
251 that are null strings (may happen). */
252 continue;
253 }
254
255 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
256 symbols which do not correspond to objects in the symbol table,
257 but have some other target-specific meaning. */
258 if (bfd_is_target_special_symbol (objfile->obfd, sym))
259 {
260 if (gdbarch_record_special_symbol_p (gdbarch))
261 gdbarch_record_special_symbol (gdbarch, objfile, sym);
262 continue;
263 }
264
265 if (type == ST_DYNAMIC
266 && sym->section == bfd_und_section_ptr
267 && (sym->flags & BSF_FUNCTION))
268 {
269 struct minimal_symbol *msym;
270 bfd *abfd = objfile->obfd;
271 asection *sect;
272
273 /* Symbol is a reference to a function defined in
274 a shared library.
275 If its value is non zero then it is usually the address
276 of the corresponding entry in the procedure linkage table,
277 plus the desired section offset.
278 If its value is zero then the dynamic linker has to resolve
279 the symbol. We are unable to find any meaningful address
280 for this symbol in the executable file, so we skip it. */
281 symaddr = sym->value;
282 if (symaddr == 0)
283 continue;
284
285 /* sym->section is the undefined section. However, we want to
286 record the section where the PLT stub resides with the
287 minimal symbol. Search the section table for the one that
288 covers the stub's address. */
289 for (sect = abfd->sections; sect != NULL; sect = sect->next)
290 {
291 if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
292 continue;
293
294 if (symaddr >= bfd_get_section_vma (abfd, sect)
295 && symaddr < bfd_get_section_vma (abfd, sect)
296 + bfd_get_section_size (sect))
297 break;
298 }
299 if (!sect)
300 continue;
301
302 /* On ia64-hpux, we have discovered that the system linker
303 adds undefined symbols with nonzero addresses that cannot
304 be right (their address points inside the code of another
305 function in the .text section). This creates problems
306 when trying to determine which symbol corresponds to
307 a given address.
308
309 We try to detect those buggy symbols by checking which
310 section we think they correspond to. Normally, PLT symbols
311 are stored inside their own section, and the typical name
312 for that section is ".plt". So, if there is a ".plt"
313 section, and yet the section name of our symbol does not
314 start with ".plt", we ignore that symbol. */
315 if (!startswith (sect->name, ".plt")
316 && bfd_get_section_by_name (abfd, ".plt") != NULL)
317 continue;
318
319 msym = record_minimal_symbol
320 (reader, sym->name, strlen (sym->name), copy_names,
321 symaddr, mst_solib_trampoline, sect, objfile);
322 if (msym != NULL)
323 {
324 msym->filename = filesymname;
325 if (elf_make_msymbol_special_p)
326 gdbarch_elf_make_msymbol_special (gdbarch, sym, msym);
327 }
328 continue;
329 }
330
331 /* If it is a nonstripped executable, do not enter dynamic
332 symbols, as the dynamic symbol table is usually a subset
333 of the main symbol table. */
334 if (type == ST_DYNAMIC && !stripped)
335 continue;
336 if (sym->flags & BSF_FILE)
337 {
338 filesymname
339 = (const char *) bcache (sym->name, strlen (sym->name) + 1,
340 objfile->per_bfd->filename_cache);
341 }
342 else if (sym->flags & BSF_SECTION_SYM)
343 continue;
344 else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK
345 | BSF_GNU_UNIQUE))
346 {
347 struct minimal_symbol *msym;
348
349 /* Select global/local/weak symbols. Note that bfd puts abs
350 symbols in their own section, so all symbols we are
351 interested in will have a section. */
352 /* Bfd symbols are section relative. */
353 symaddr = sym->value + sym->section->vma;
354 /* For non-absolute symbols, use the type of the section
355 they are relative to, to intuit text/data. Bfd provides
356 no way of figuring this out for absolute symbols. */
357 if (sym->section == bfd_abs_section_ptr)
358 {
359 /* This is a hack to get the minimal symbol type
360 right for Irix 5, which has absolute addresses
361 with special section indices for dynamic symbols.
362
363 NOTE: uweigand-20071112: Synthetic symbols do not
364 have an ELF-private part, so do not touch those. */
365 unsigned int shndx = type == ST_SYNTHETIC ? 0 :
366 ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
367
368 switch (shndx)
369 {
370 case SHN_MIPS_TEXT:
371 ms_type = mst_text;
372 break;
373 case SHN_MIPS_DATA:
374 ms_type = mst_data;
375 break;
376 case SHN_MIPS_ACOMMON:
377 ms_type = mst_bss;
378 break;
379 default:
380 ms_type = mst_abs;
381 }
382
383 /* If it is an Irix dynamic symbol, skip section name
384 symbols, relocate all others by section offset. */
385 if (ms_type != mst_abs)
386 {
387 if (sym->name[0] == '.')
388 continue;
389 }
390 }
391 else if (sym->section->flags & SEC_CODE)
392 {
393 if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE))
394 {
395 if (sym->flags & BSF_GNU_INDIRECT_FUNCTION)
396 ms_type = mst_text_gnu_ifunc;
397 else
398 ms_type = mst_text;
399 }
400 /* The BSF_SYNTHETIC check is there to omit ppc64 function
401 descriptors mistaken for static functions starting with 'L'.
402 */
403 else if ((sym->name[0] == '.' && sym->name[1] == 'L'
404 && (sym->flags & BSF_SYNTHETIC) == 0)
405 || ((sym->flags & BSF_LOCAL)
406 && sym->name[0] == '$'
407 && sym->name[1] == 'L'))
408 /* Looks like a compiler-generated label. Skip
409 it. The assembler should be skipping these (to
410 keep executables small), but apparently with
411 gcc on the (deleted) delta m88k SVR4, it loses.
412 So to have us check too should be harmless (but
413 I encourage people to fix this in the assembler
414 instead of adding checks here). */
415 continue;
416 else
417 {
418 ms_type = mst_file_text;
419 }
420 }
421 else if (sym->section->flags & SEC_ALLOC)
422 {
423 if (sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE))
424 {
425 if (sym->section->flags & SEC_LOAD)
426 {
427 ms_type = mst_data;
428 }
429 else
430 {
431 ms_type = mst_bss;
432 }
433 }
434 else if (sym->flags & BSF_LOCAL)
435 {
436 if (sym->section->flags & SEC_LOAD)
437 {
438 ms_type = mst_file_data;
439 }
440 else
441 {
442 ms_type = mst_file_bss;
443 }
444 }
445 else
446 {
447 ms_type = mst_unknown;
448 }
449 }
450 else
451 {
452 /* FIXME: Solaris2 shared libraries include lots of
453 odd "absolute" and "undefined" symbols, that play
454 hob with actions like finding what function the PC
455 is in. Ignore them if they aren't text, data, or bss. */
456 /* ms_type = mst_unknown; */
457 continue; /* Skip this symbol. */
458 }
459 msym = record_minimal_symbol
460 (reader, sym->name, strlen (sym->name), copy_names, symaddr,
461 ms_type, sym->section, objfile);
462
463 if (msym)
464 {
465 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
466 ELF-private part. */
467 if (type != ST_SYNTHETIC)
468 {
469 /* Pass symbol size field in via BFD. FIXME!!! */
470 elf_symbol_type *elf_sym = (elf_symbol_type *) sym;
471 SET_MSYMBOL_SIZE (msym, elf_sym->internal_elf_sym.st_size);
472 }
473
474 msym->filename = filesymname;
475 if (elf_make_msymbol_special_p)
476 gdbarch_elf_make_msymbol_special (gdbarch, sym, msym);
477 }
478
479 /* If we see a default versioned symbol, install it under
480 its version-less name. */
481 if (msym != NULL)
482 {
483 const char *atsign = strchr (sym->name, '@');
484
485 if (atsign != NULL && atsign[1] == '@' && atsign > sym->name)
486 {
487 int len = atsign - sym->name;
488
489 record_minimal_symbol (reader, sym->name, len, true, symaddr,
490 ms_type, sym->section, objfile);
491 }
492 }
493
494 /* For @plt symbols, also record a trampoline to the
495 destination symbol. The @plt symbol will be used in
496 disassembly, and the trampoline will be used when we are
497 trying to find the target. */
498 if (msym && ms_type == mst_text && type == ST_SYNTHETIC)
499 {
500 int len = strlen (sym->name);
501
502 if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0)
503 {
504 struct minimal_symbol *mtramp;
505
506 mtramp = record_minimal_symbol (reader, sym->name, len - 4,
507 true, symaddr,
508 mst_solib_trampoline,
509 sym->section, objfile);
510 if (mtramp)
511 {
512 SET_MSYMBOL_SIZE (mtramp, MSYMBOL_SIZE (msym));
513 mtramp->created_by_gdb = 1;
514 mtramp->filename = filesymname;
515 if (elf_make_msymbol_special_p)
516 gdbarch_elf_make_msymbol_special (gdbarch,
517 sym, mtramp);
518 }
519 }
520 }
521 }
522 }
523 }
524
525 /* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX)
526 for later look ups of which function to call when user requests
527 a STT_GNU_IFUNC function. As the STT_GNU_IFUNC type is found at the target
528 library defining `function' we cannot yet know while reading OBJFILE which
529 of the SYMBOL_GOT_PLT_SUFFIX entries will be needed and later
530 DYN_SYMBOL_TABLE is no longer easily available for OBJFILE. */
531
532 static void
533 elf_rel_plt_read (minimal_symbol_reader &reader,
534 struct objfile *objfile, asymbol **dyn_symbol_table)
535 {
536 bfd *obfd = objfile->obfd;
537 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
538 asection *plt, *relplt, *got_plt;
539 int plt_elf_idx;
540 bfd_size_type reloc_count, reloc;
541 struct gdbarch *gdbarch = get_objfile_arch (objfile);
542 struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
543 size_t ptr_size = TYPE_LENGTH (ptr_type);
544
545 if (objfile->separate_debug_objfile_backlink)
546 return;
547
548 plt = bfd_get_section_by_name (obfd, ".plt");
549 if (plt == NULL)
550 return;
551 plt_elf_idx = elf_section_data (plt)->this_idx;
552
553 got_plt = bfd_get_section_by_name (obfd, ".got.plt");
554 if (got_plt == NULL)
555 {
556 /* For platforms where there is no separate .got.plt. */
557 got_plt = bfd_get_section_by_name (obfd, ".got");
558 if (got_plt == NULL)
559 return;
560 }
561
562 /* This search algorithm is from _bfd_elf_canonicalize_dynamic_reloc. */
563 for (relplt = obfd->sections; relplt != NULL; relplt = relplt->next)
564 if (elf_section_data (relplt)->this_hdr.sh_info == plt_elf_idx
565 && (elf_section_data (relplt)->this_hdr.sh_type == SHT_REL
566 || elf_section_data (relplt)->this_hdr.sh_type == SHT_RELA))
567 break;
568 if (relplt == NULL)
569 return;
570
571 if (! bed->s->slurp_reloc_table (obfd, relplt, dyn_symbol_table, TRUE))
572 return;
573
574 std::string string_buffer;
575
576 reloc_count = relplt->size / elf_section_data (relplt)->this_hdr.sh_entsize;
577 for (reloc = 0; reloc < reloc_count; reloc++)
578 {
579 const char *name;
580 struct minimal_symbol *msym;
581 CORE_ADDR address;
582 const char *got_suffix = SYMBOL_GOT_PLT_SUFFIX;
583 const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX);
584
585 name = bfd_asymbol_name (*relplt->relocation[reloc].sym_ptr_ptr);
586 address = relplt->relocation[reloc].address;
587
588 /* Does the pointer reside in the .got.plt section? */
589 if (!(bfd_get_section_vma (obfd, got_plt) <= address
590 && address < bfd_get_section_vma (obfd, got_plt)
591 + bfd_get_section_size (got_plt)))
592 continue;
593
594 /* We cannot check if NAME is a reference to mst_text_gnu_ifunc as in
595 OBJFILE the symbol is undefined and the objfile having NAME defined
596 may not yet have been loaded. */
597
598 string_buffer.assign (name);
599 string_buffer.append (got_suffix, got_suffix + got_suffix_len);
600
601 msym = record_minimal_symbol (reader, string_buffer.c_str (),
602 string_buffer.size (),
603 true, address, mst_slot_got_plt, got_plt,
604 objfile);
605 if (msym)
606 SET_MSYMBOL_SIZE (msym, ptr_size);
607 }
608 }
609
610 /* The data pointer is htab_t for gnu_ifunc_record_cache_unchecked. */
611
612 static const struct objfile_data *elf_objfile_gnu_ifunc_cache_data;
613
614 /* Map function names to CORE_ADDR in elf_objfile_gnu_ifunc_cache_data. */
615
616 struct elf_gnu_ifunc_cache
617 {
618 /* This is always a function entry address, not a function descriptor. */
619 CORE_ADDR addr;
620
621 char name[1];
622 };
623
624 /* htab_hash for elf_objfile_gnu_ifunc_cache_data. */
625
626 static hashval_t
627 elf_gnu_ifunc_cache_hash (const void *a_voidp)
628 {
629 const struct elf_gnu_ifunc_cache *a
630 = (const struct elf_gnu_ifunc_cache *) a_voidp;
631
632 return htab_hash_string (a->name);
633 }
634
635 /* htab_eq for elf_objfile_gnu_ifunc_cache_data. */
636
637 static int
638 elf_gnu_ifunc_cache_eq (const void *a_voidp, const void *b_voidp)
639 {
640 const struct elf_gnu_ifunc_cache *a
641 = (const struct elf_gnu_ifunc_cache *) a_voidp;
642 const struct elf_gnu_ifunc_cache *b
643 = (const struct elf_gnu_ifunc_cache *) b_voidp;
644
645 return strcmp (a->name, b->name) == 0;
646 }
647
648 /* Record the target function address of a STT_GNU_IFUNC function NAME is the
649 function entry address ADDR. Return 1 if NAME and ADDR are considered as
650 valid and therefore they were successfully recorded, return 0 otherwise.
651
652 Function does not expect a duplicate entry. Use
653 elf_gnu_ifunc_resolve_by_cache first to check if the entry for NAME already
654 exists. */
655
656 static int
657 elf_gnu_ifunc_record_cache (const char *name, CORE_ADDR addr)
658 {
659 struct bound_minimal_symbol msym;
660 asection *sect;
661 struct objfile *objfile;
662 htab_t htab;
663 struct elf_gnu_ifunc_cache entry_local, *entry_p;
664 void **slot;
665
666 msym = lookup_minimal_symbol_by_pc (addr);
667 if (msym.minsym == NULL)
668 return 0;
669 if (BMSYMBOL_VALUE_ADDRESS (msym) != addr)
670 return 0;
671 /* minimal symbols have always SYMBOL_OBJ_SECTION non-NULL. */
672 sect = MSYMBOL_OBJ_SECTION (msym.objfile, msym.minsym)->the_bfd_section;
673 objfile = msym.objfile;
674
675 /* If .plt jumps back to .plt the symbol is still deferred for later
676 resolution and it has no use for GDB. Besides ".text" this symbol can
677 reside also in ".opd" for ppc64 function descriptor. */
678 if (strcmp (bfd_get_section_name (objfile->obfd, sect), ".plt") == 0)
679 return 0;
680
681 htab = (htab_t) objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data);
682 if (htab == NULL)
683 {
684 htab = htab_create_alloc_ex (1, elf_gnu_ifunc_cache_hash,
685 elf_gnu_ifunc_cache_eq,
686 NULL, &objfile->objfile_obstack,
687 hashtab_obstack_allocate,
688 dummy_obstack_deallocate);
689 set_objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data, htab);
690 }
691
692 entry_local.addr = addr;
693 obstack_grow (&objfile->objfile_obstack, &entry_local,
694 offsetof (struct elf_gnu_ifunc_cache, name));
695 obstack_grow_str0 (&objfile->objfile_obstack, name);
696 entry_p
697 = (struct elf_gnu_ifunc_cache *) obstack_finish (&objfile->objfile_obstack);
698
699 slot = htab_find_slot (htab, entry_p, INSERT);
700 if (*slot != NULL)
701 {
702 struct elf_gnu_ifunc_cache *entry_found_p
703 = (struct elf_gnu_ifunc_cache *) *slot;
704 struct gdbarch *gdbarch = get_objfile_arch (objfile);
705
706 if (entry_found_p->addr != addr)
707 {
708 /* This case indicates buggy inferior program, the resolved address
709 should never change. */
710
711 warning (_("gnu-indirect-function \"%s\" has changed its resolved "
712 "function_address from %s to %s"),
713 name, paddress (gdbarch, entry_found_p->addr),
714 paddress (gdbarch, addr));
715 }
716
717 /* New ENTRY_P is here leaked/duplicate in the OBJFILE obstack. */
718 }
719 *slot = entry_p;
720
721 return 1;
722 }
723
724 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
725 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
726 is not NULL) and the function returns 1. It returns 0 otherwise.
727
728 Only the elf_objfile_gnu_ifunc_cache_data hash table is searched by this
729 function. */
730
731 static int
732 elf_gnu_ifunc_resolve_by_cache (const char *name, CORE_ADDR *addr_p)
733 {
734 struct objfile *objfile;
735
736 ALL_PSPACE_OBJFILES (current_program_space, objfile)
737 {
738 htab_t htab;
739 struct elf_gnu_ifunc_cache *entry_p;
740 void **slot;
741
742 htab = (htab_t) objfile_data (objfile, elf_objfile_gnu_ifunc_cache_data);
743 if (htab == NULL)
744 continue;
745
746 entry_p = ((struct elf_gnu_ifunc_cache *)
747 alloca (sizeof (*entry_p) + strlen (name)));
748 strcpy (entry_p->name, name);
749
750 slot = htab_find_slot (htab, entry_p, NO_INSERT);
751 if (slot == NULL)
752 continue;
753 entry_p = (struct elf_gnu_ifunc_cache *) *slot;
754 gdb_assert (entry_p != NULL);
755
756 if (addr_p)
757 *addr_p = entry_p->addr;
758 return 1;
759 }
760
761 return 0;
762 }
763
764 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
765 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
766 is not NULL) and the function returns 1. It returns 0 otherwise.
767
768 Only the SYMBOL_GOT_PLT_SUFFIX locations are searched by this function.
769 elf_gnu_ifunc_resolve_by_cache must have been already called for NAME to
770 prevent cache entries duplicates. */
771
772 static int
773 elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p)
774 {
775 char *name_got_plt;
776 struct objfile *objfile;
777 const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX);
778
779 name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1);
780 sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name);
781
782 ALL_PSPACE_OBJFILES (current_program_space, objfile)
783 {
784 bfd *obfd = objfile->obfd;
785 struct gdbarch *gdbarch = get_objfile_arch (objfile);
786 struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
787 size_t ptr_size = TYPE_LENGTH (ptr_type);
788 CORE_ADDR pointer_address, addr;
789 asection *plt;
790 gdb_byte *buf = (gdb_byte *) alloca (ptr_size);
791 struct bound_minimal_symbol msym;
792
793 msym = lookup_minimal_symbol (name_got_plt, NULL, objfile);
794 if (msym.minsym == NULL)
795 continue;
796 if (MSYMBOL_TYPE (msym.minsym) != mst_slot_got_plt)
797 continue;
798 pointer_address = BMSYMBOL_VALUE_ADDRESS (msym);
799
800 plt = bfd_get_section_by_name (obfd, ".plt");
801 if (plt == NULL)
802 continue;
803
804 if (MSYMBOL_SIZE (msym.minsym) != ptr_size)
805 continue;
806 if (target_read_memory (pointer_address, buf, ptr_size) != 0)
807 continue;
808 addr = extract_typed_address (buf, ptr_type);
809 addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr,
810 &current_target);
811 addr = gdbarch_addr_bits_remove (gdbarch, addr);
812
813 if (addr_p)
814 *addr_p = addr;
815 if (elf_gnu_ifunc_record_cache (name, addr))
816 return 1;
817 }
818
819 return 0;
820 }
821
822 /* Try to find the target resolved function entry address of a STT_GNU_IFUNC
823 function NAME. If the address is found it is stored to *ADDR_P (if ADDR_P
824 is not NULL) and the function returns 1. It returns 0 otherwise.
825
826 Both the elf_objfile_gnu_ifunc_cache_data hash table and
827 SYMBOL_GOT_PLT_SUFFIX locations are searched by this function. */
828
829 static int
830 elf_gnu_ifunc_resolve_name (const char *name, CORE_ADDR *addr_p)
831 {
832 if (elf_gnu_ifunc_resolve_by_cache (name, addr_p))
833 return 1;
834
835 if (elf_gnu_ifunc_resolve_by_got (name, addr_p))
836 return 1;
837
838 return 0;
839 }
840
841 /* Call STT_GNU_IFUNC - a function returning addresss of a real function to
842 call. PC is theSTT_GNU_IFUNC resolving function entry. The value returned
843 is the entry point of the resolved STT_GNU_IFUNC target function to call.
844 */
845
846 static CORE_ADDR
847 elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc)
848 {
849 const char *name_at_pc;
850 CORE_ADDR start_at_pc, address;
851 struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func;
852 struct value *function, *address_val;
853 CORE_ADDR hwcap = 0;
854 struct value *hwcap_val;
855
856 /* Try first any non-intrusive methods without an inferior call. */
857
858 if (find_pc_partial_function (pc, &name_at_pc, &start_at_pc, NULL)
859 && start_at_pc == pc)
860 {
861 if (elf_gnu_ifunc_resolve_name (name_at_pc, &address))
862 return address;
863 }
864 else
865 name_at_pc = NULL;
866
867 function = allocate_value (func_func_type);
868 VALUE_LVAL (function) = lval_memory;
869 set_value_address (function, pc);
870
871 /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as
872 parameter. FUNCTION is the function entry address. ADDRESS may be a
873 function descriptor. */
874
875 target_auxv_search (&current_target, AT_HWCAP, &hwcap);
876 hwcap_val = value_from_longest (builtin_type (gdbarch)
877 ->builtin_unsigned_long, hwcap);
878 address_val = call_function_by_hand (function, NULL, 1, &hwcap_val);
879 address = value_as_address (address_val);
880 address = gdbarch_convert_from_func_ptr_addr (gdbarch, address,
881 &current_target);
882 address = gdbarch_addr_bits_remove (gdbarch, address);
883
884 if (name_at_pc)
885 elf_gnu_ifunc_record_cache (name_at_pc, address);
886
887 return address;
888 }
889
890 /* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */
891
892 static void
893 elf_gnu_ifunc_resolver_stop (struct breakpoint *b)
894 {
895 struct breakpoint *b_return;
896 struct frame_info *prev_frame = get_prev_frame (get_current_frame ());
897 struct frame_id prev_frame_id = get_stack_frame_id (prev_frame);
898 CORE_ADDR prev_pc = get_frame_pc (prev_frame);
899 int thread_id = ptid_to_global_thread_id (inferior_ptid);
900
901 gdb_assert (b->type == bp_gnu_ifunc_resolver);
902
903 for (b_return = b->related_breakpoint; b_return != b;
904 b_return = b_return->related_breakpoint)
905 {
906 gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return);
907 gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL);
908 gdb_assert (frame_id_p (b_return->frame_id));
909
910 if (b_return->thread == thread_id
911 && b_return->loc->requested_address == prev_pc
912 && frame_id_eq (b_return->frame_id, prev_frame_id))
913 break;
914 }
915
916 if (b_return == b)
917 {
918 /* No need to call find_pc_line for symbols resolving as this is only
919 a helper breakpointer never shown to the user. */
920
921 symtab_and_line sal;
922 sal.pspace = current_inferior ()->pspace;
923 sal.pc = prev_pc;
924 sal.section = find_pc_overlay (sal.pc);
925 sal.explicit_pc = 1;
926 b_return
927 = set_momentary_breakpoint (get_frame_arch (prev_frame), sal,
928 prev_frame_id,
929 bp_gnu_ifunc_resolver_return).release ();
930
931 /* set_momentary_breakpoint invalidates PREV_FRAME. */
932 prev_frame = NULL;
933
934 /* Add new b_return to the ring list b->related_breakpoint. */
935 gdb_assert (b_return->related_breakpoint == b_return);
936 b_return->related_breakpoint = b->related_breakpoint;
937 b->related_breakpoint = b_return;
938 }
939 }
940
941 /* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */
942
943 static void
944 elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b)
945 {
946 struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
947 struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func;
948 struct type *value_type = TYPE_TARGET_TYPE (func_func_type);
949 struct regcache *regcache = get_thread_regcache (inferior_ptid);
950 struct value *func_func;
951 struct value *value;
952 CORE_ADDR resolved_address, resolved_pc;
953
954 gdb_assert (b->type == bp_gnu_ifunc_resolver_return);
955
956 while (b->related_breakpoint != b)
957 {
958 struct breakpoint *b_next = b->related_breakpoint;
959
960 switch (b->type)
961 {
962 case bp_gnu_ifunc_resolver:
963 break;
964 case bp_gnu_ifunc_resolver_return:
965 delete_breakpoint (b);
966 break;
967 default:
968 internal_error (__FILE__, __LINE__,
969 _("handle_inferior_event: Invalid "
970 "gnu-indirect-function breakpoint type %d"),
971 (int) b->type);
972 }
973 b = b_next;
974 }
975 gdb_assert (b->type == bp_gnu_ifunc_resolver);
976 gdb_assert (b->loc->next == NULL);
977
978 func_func = allocate_value (func_func_type);
979 VALUE_LVAL (func_func) = lval_memory;
980 set_value_address (func_func, b->loc->related_address);
981
982 value = allocate_value (value_type);
983 gdbarch_return_value (gdbarch, func_func, value_type, regcache,
984 value_contents_raw (value), NULL);
985 resolved_address = value_as_address (value);
986 resolved_pc = gdbarch_convert_from_func_ptr_addr (gdbarch,
987 resolved_address,
988 &current_target);
989 resolved_pc = gdbarch_addr_bits_remove (gdbarch, resolved_pc);
990
991 gdb_assert (current_program_space == b->pspace || b->pspace == NULL);
992 elf_gnu_ifunc_record_cache (event_location_to_string (b->location.get ()),
993 resolved_pc);
994
995 b->type = bp_breakpoint;
996 update_breakpoint_locations (b, current_program_space,
997 find_pc_line (resolved_pc, 0), {});
998 }
999
1000 /* A helper function for elf_symfile_read that reads the minimal
1001 symbols. */
1002
1003 static void
1004 elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags,
1005 const struct elfinfo *ei)
1006 {
1007 bfd *synth_abfd, *abfd = objfile->obfd;
1008 long symcount = 0, dynsymcount = 0, synthcount, storage_needed;
1009 asymbol **symbol_table = NULL, **dyn_symbol_table = NULL;
1010 asymbol *synthsyms;
1011 struct dbx_symfile_info *dbx;
1012
1013 if (symtab_create_debug)
1014 {
1015 fprintf_unfiltered (gdb_stdlog,
1016 "Reading minimal symbols of objfile %s ...\n",
1017 objfile_name (objfile));
1018 }
1019
1020 /* If we already have minsyms, then we can skip some work here.
1021 However, if there were stabs or mdebug sections, we go ahead and
1022 redo all the work anyway, because the psym readers for those
1023 kinds of debuginfo need extra information found here. This can
1024 go away once all types of symbols are in the per-BFD object. */
1025 if (objfile->per_bfd->minsyms_read
1026 && ei->stabsect == NULL
1027 && ei->mdebugsect == NULL)
1028 {
1029 if (symtab_create_debug)
1030 fprintf_unfiltered (gdb_stdlog,
1031 "... minimal symbols previously read\n");
1032 return;
1033 }
1034
1035 minimal_symbol_reader reader (objfile);
1036
1037 /* Allocate struct to keep track of the symfile. */
1038 dbx = XCNEW (struct dbx_symfile_info);
1039 set_objfile_data (objfile, dbx_objfile_data_key, dbx);
1040
1041 /* Process the normal ELF symbol table first. */
1042
1043 storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
1044 if (storage_needed < 0)
1045 error (_("Can't read symbols from %s: %s"),
1046 bfd_get_filename (objfile->obfd),
1047 bfd_errmsg (bfd_get_error ()));
1048
1049 if (storage_needed > 0)
1050 {
1051 /* Memory gets permanently referenced from ABFD after
1052 bfd_canonicalize_symtab so it must not get freed before ABFD gets. */
1053
1054 symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed);
1055 symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table);
1056
1057 if (symcount < 0)
1058 error (_("Can't read symbols from %s: %s"),
1059 bfd_get_filename (objfile->obfd),
1060 bfd_errmsg (bfd_get_error ()));
1061
1062 elf_symtab_read (reader, objfile, ST_REGULAR, symcount, symbol_table,
1063 false);
1064 }
1065
1066 /* Add the dynamic symbols. */
1067
1068 storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd);
1069
1070 if (storage_needed > 0)
1071 {
1072 /* Memory gets permanently referenced from ABFD after
1073 bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
1074 It happens only in the case when elf_slurp_reloc_table sees
1075 asection->relocation NULL. Determining which section is asection is
1076 done by _bfd_elf_get_synthetic_symtab which is all a bfd
1077 implementation detail, though. */
1078
1079 dyn_symbol_table = (asymbol **) bfd_alloc (abfd, storage_needed);
1080 dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd,
1081 dyn_symbol_table);
1082
1083 if (dynsymcount < 0)
1084 error (_("Can't read symbols from %s: %s"),
1085 bfd_get_filename (objfile->obfd),
1086 bfd_errmsg (bfd_get_error ()));
1087
1088 elf_symtab_read (reader, objfile, ST_DYNAMIC, dynsymcount,
1089 dyn_symbol_table, false);
1090
1091 elf_rel_plt_read (reader, objfile, dyn_symbol_table);
1092 }
1093
1094 /* Contrary to binutils --strip-debug/--only-keep-debug the strip command from
1095 elfutils (eu-strip) moves even the .symtab section into the .debug file.
1096
1097 bfd_get_synthetic_symtab on ppc64 for each function descriptor ELF symbol
1098 'name' creates a new BSF_SYNTHETIC ELF symbol '.name' with its code
1099 address. But with eu-strip files bfd_get_synthetic_symtab would fail to
1100 read the code address from .opd while it reads the .symtab section from
1101 a separate debug info file as the .opd section is SHT_NOBITS there.
1102
1103 With SYNTH_ABFD the .opd section will be read from the original
1104 backlinked binary where it is valid. */
1105
1106 if (objfile->separate_debug_objfile_backlink)
1107 synth_abfd = objfile->separate_debug_objfile_backlink->obfd;
1108 else
1109 synth_abfd = abfd;
1110
1111 /* Add synthetic symbols - for instance, names for any PLT entries. */
1112
1113 synthcount = bfd_get_synthetic_symtab (synth_abfd, symcount, symbol_table,
1114 dynsymcount, dyn_symbol_table,
1115 &synthsyms);
1116 if (synthcount > 0)
1117 {
1118 long i;
1119
1120 std::unique_ptr<asymbol *[]>
1121 synth_symbol_table (new asymbol *[synthcount]);
1122 for (i = 0; i < synthcount; i++)
1123 synth_symbol_table[i] = synthsyms + i;
1124 elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount,
1125 synth_symbol_table.get (), true);
1126
1127 xfree (synthsyms);
1128 synthsyms = NULL;
1129 }
1130
1131 /* Install any minimal symbols that have been collected as the current
1132 minimal symbols for this objfile. The debug readers below this point
1133 should not generate new minimal symbols; if they do it's their
1134 responsibility to install them. "mdebug" appears to be the only one
1135 which will do this. */
1136
1137 reader.install ();
1138
1139 if (symtab_create_debug)
1140 fprintf_unfiltered (gdb_stdlog, "Done reading minimal symbols.\n");
1141 }
1142
1143 /* Scan and build partial symbols for a symbol file.
1144 We have been initialized by a call to elf_symfile_init, which
1145 currently does nothing.
1146
1147 This function only does the minimum work necessary for letting the
1148 user "name" things symbolically; it does not read the entire symtab.
1149 Instead, it reads the external and static symbols and puts them in partial
1150 symbol tables. When more extensive information is requested of a
1151 file, the corresponding partial symbol table is mutated into a full
1152 fledged symbol table by going back and reading the symbols
1153 for real.
1154
1155 We look for sections with specific names, to tell us what debug
1156 format to look for: FIXME!!!
1157
1158 elfstab_build_psymtabs() handles STABS symbols;
1159 mdebug_build_psymtabs() handles ECOFF debugging information.
1160
1161 Note that ELF files have a "minimal" symbol table, which looks a lot
1162 like a COFF symbol table, but has only the minimal information necessary
1163 for linking. We process this also, and use the information to
1164 build gdb's minimal symbol table. This gives us some minimal debugging
1165 capability even for files compiled without -g. */
1166
1167 static void
1168 elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
1169 {
1170 bfd *abfd = objfile->obfd;
1171 struct elfinfo ei;
1172
1173 memset ((char *) &ei, 0, sizeof (ei));
1174 if (!(objfile->flags & OBJF_READNEVER))
1175 bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei);
1176
1177 elf_read_minimal_symbols (objfile, symfile_flags, &ei);
1178
1179 /* ELF debugging information is inserted into the psymtab in the
1180 order of least informative first - most informative last. Since
1181 the psymtab table is searched `most recent insertion first' this
1182 increases the probability that more detailed debug information
1183 for a section is found.
1184
1185 For instance, an object file might contain both .mdebug (XCOFF)
1186 and .debug_info (DWARF2) sections then .mdebug is inserted first
1187 (searched last) and DWARF2 is inserted last (searched first). If
1188 we don't do this then the XCOFF info is found first - for code in
1189 an included file XCOFF info is useless. */
1190
1191 if (ei.mdebugsect)
1192 {
1193 const struct ecoff_debug_swap *swap;
1194
1195 /* .mdebug section, presumably holding ECOFF debugging
1196 information. */
1197 swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
1198 if (swap)
1199 elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect);
1200 }
1201 if (ei.stabsect)
1202 {
1203 asection *str_sect;
1204
1205 /* Stab sections have an associated string table that looks like
1206 a separate section. */
1207 str_sect = bfd_get_section_by_name (abfd, ".stabstr");
1208
1209 /* FIXME should probably warn about a stab section without a stabstr. */
1210 if (str_sect)
1211 elfstab_build_psymtabs (objfile,
1212 ei.stabsect,
1213 str_sect->filepos,
1214 bfd_section_size (abfd, str_sect));
1215 }
1216
1217 if (dwarf2_has_info (objfile, NULL))
1218 {
1219 dw_index_kind index_kind;
1220
1221 /* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF
1222 debug information present in OBJFILE. If there is such debug
1223 info present never use an index. */
1224 if (!objfile_has_partial_symbols (objfile)
1225 && dwarf2_initialize_objfile (objfile, &index_kind))
1226 {
1227 switch (index_kind)
1228 {
1229 case dw_index_kind::GDB_INDEX:
1230 objfile_set_sym_fns (objfile, &elf_sym_fns_gdb_index);
1231 break;
1232 case dw_index_kind::DEBUG_NAMES:
1233 objfile_set_sym_fns (objfile, &elf_sym_fns_debug_names);
1234 break;
1235 }
1236 }
1237 else
1238 {
1239 /* It is ok to do this even if the stabs reader made some
1240 partial symbols, because OBJF_PSYMTABS_READ has not been
1241 set, and so our lazy reader function will still be called
1242 when needed. */
1243 objfile_set_sym_fns (objfile, &elf_sym_fns_lazy_psyms);
1244 }
1245 }
1246 /* If the file has its own symbol tables it has no separate debug
1247 info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to
1248 SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with
1249 `.note.gnu.build-id'.
1250
1251 .gnu_debugdata is !objfile_has_partial_symbols because it contains only
1252 .symtab, not .debug_* section. But if we already added .gnu_debugdata as
1253 an objfile via find_separate_debug_file_in_section there was no separate
1254 debug info available. Therefore do not attempt to search for another one,
1255 objfile->separate_debug_objfile->separate_debug_objfile GDB guarantees to
1256 be NULL and we would possibly violate it. */
1257
1258 else if (!objfile_has_partial_symbols (objfile)
1259 && objfile->separate_debug_objfile == NULL
1260 && objfile->separate_debug_objfile_backlink == NULL)
1261 {
1262 gdb::unique_xmalloc_ptr<char> debugfile
1263 (find_separate_debug_file_by_buildid (objfile));
1264
1265 if (debugfile == NULL)
1266 debugfile.reset (find_separate_debug_file_by_debuglink (objfile));
1267
1268 if (debugfile != NULL)
1269 {
1270 gdb_bfd_ref_ptr abfd (symfile_bfd_open (debugfile.get ()));
1271
1272 symbol_file_add_separate (abfd.get (), debugfile.get (),
1273 symfile_flags, objfile);
1274 }
1275 }
1276 }
1277
1278 /* Callback to lazily read psymtabs. */
1279
1280 static void
1281 read_psyms (struct objfile *objfile)
1282 {
1283 if (dwarf2_has_info (objfile, NULL))
1284 dwarf2_build_psymtabs (objfile);
1285 }
1286
1287 /* Initialize anything that needs initializing when a completely new symbol
1288 file is specified (not just adding some symbols from another file, e.g. a
1289 shared library).
1290
1291 We reinitialize buildsym, since we may be reading stabs from an ELF
1292 file. */
1293
1294 static void
1295 elf_new_init (struct objfile *ignore)
1296 {
1297 stabsread_new_init ();
1298 buildsym_new_init ();
1299 }
1300
1301 /* Perform any local cleanups required when we are done with a particular
1302 objfile. I.E, we are in the process of discarding all symbol information
1303 for an objfile, freeing up all memory held for it, and unlinking the
1304 objfile struct from the global list of known objfiles. */
1305
1306 static void
1307 elf_symfile_finish (struct objfile *objfile)
1308 {
1309 dwarf2_free_objfile (objfile);
1310 }
1311
1312 /* ELF specific initialization routine for reading symbols. */
1313
1314 static void
1315 elf_symfile_init (struct objfile *objfile)
1316 {
1317 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
1318 find this causes a significant slowdown in gdb then we could
1319 set it in the debug symbol readers only when necessary. */
1320 objfile->flags |= OBJF_REORDERED;
1321 }
1322
1323 /* Implementation of `sym_get_probes', as documented in symfile.h. */
1324
1325 static const std::vector<probe *> &
1326 elf_get_probes (struct objfile *objfile)
1327 {
1328 std::vector<probe *> *probes_per_bfd;
1329
1330 /* Have we parsed this objfile's probes already? */
1331 probes_per_bfd = (std::vector<probe *> *) bfd_data (objfile->obfd, probe_key);
1332
1333 if (probes_per_bfd == NULL)
1334 {
1335 probes_per_bfd = new std::vector<probe *>;
1336
1337 /* Here we try to gather information about all types of probes from the
1338 objfile. */
1339 for (const static_probe_ops *ops : all_static_probe_ops)
1340 ops->get_probes (probes_per_bfd, objfile);
1341
1342 set_bfd_data (objfile->obfd, probe_key, probes_per_bfd);
1343 }
1344
1345 return *probes_per_bfd;
1346 }
1347
1348 /* Helper function used to free the space allocated for storing SystemTap
1349 probe information. */
1350
1351 static void
1352 probe_key_free (bfd *abfd, void *d)
1353 {
1354 std::vector<probe *> *probes = (std::vector<probe *> *) d;
1355
1356 for (probe *p : *probes)
1357 delete p;
1358
1359 delete probes;
1360 }
1361
1362
1363
1364 /* Implementation `sym_probe_fns', as documented in symfile.h. */
1365
1366 static const struct sym_probe_fns elf_probe_fns =
1367 {
1368 elf_get_probes, /* sym_get_probes */
1369 };
1370
1371 /* Register that we are able to handle ELF object file formats. */
1372
1373 static const struct sym_fns elf_sym_fns =
1374 {
1375 elf_new_init, /* init anything gbl to entire symtab */
1376 elf_symfile_init, /* read initial info, setup for sym_read() */
1377 elf_symfile_read, /* read a symbol file into symtab */
1378 NULL, /* sym_read_psymbols */
1379 elf_symfile_finish, /* finished with file, cleanup */
1380 default_symfile_offsets, /* Translate ext. to int. relocation */
1381 elf_symfile_segments, /* Get segment information from a file. */
1382 NULL,
1383 default_symfile_relocate, /* Relocate a debug section. */
1384 &elf_probe_fns, /* sym_probe_fns */
1385 &psym_functions
1386 };
1387
1388 /* The same as elf_sym_fns, but not registered and lazily reads
1389 psymbols. */
1390
1391 const struct sym_fns elf_sym_fns_lazy_psyms =
1392 {
1393 elf_new_init, /* init anything gbl to entire symtab */
1394 elf_symfile_init, /* read initial info, setup for sym_read() */
1395 elf_symfile_read, /* read a symbol file into symtab */
1396 read_psyms, /* sym_read_psymbols */
1397 elf_symfile_finish, /* finished with file, cleanup */
1398 default_symfile_offsets, /* Translate ext. to int. relocation */
1399 elf_symfile_segments, /* Get segment information from a file. */
1400 NULL,
1401 default_symfile_relocate, /* Relocate a debug section. */
1402 &elf_probe_fns, /* sym_probe_fns */
1403 &psym_functions
1404 };
1405
1406 /* The same as elf_sym_fns, but not registered and uses the
1407 DWARF-specific GNU index rather than psymtab. */
1408 const struct sym_fns elf_sym_fns_gdb_index =
1409 {
1410 elf_new_init, /* init anything gbl to entire symab */
1411 elf_symfile_init, /* read initial info, setup for sym_red() */
1412 elf_symfile_read, /* read a symbol file into symtab */
1413 NULL, /* sym_read_psymbols */
1414 elf_symfile_finish, /* finished with file, cleanup */
1415 default_symfile_offsets, /* Translate ext. to int. relocatin */
1416 elf_symfile_segments, /* Get segment information from a file. */
1417 NULL,
1418 default_symfile_relocate, /* Relocate a debug section. */
1419 &elf_probe_fns, /* sym_probe_fns */
1420 &dwarf2_gdb_index_functions
1421 };
1422
1423 /* The same as elf_sym_fns, but not registered and uses the
1424 DWARF-specific .debug_names index rather than psymtab. */
1425 const struct sym_fns elf_sym_fns_debug_names =
1426 {
1427 elf_new_init, /* init anything gbl to entire symab */
1428 elf_symfile_init, /* read initial info, setup for sym_red() */
1429 elf_symfile_read, /* read a symbol file into symtab */
1430 NULL, /* sym_read_psymbols */
1431 elf_symfile_finish, /* finished with file, cleanup */
1432 default_symfile_offsets, /* Translate ext. to int. relocatin */
1433 elf_symfile_segments, /* Get segment information from a file. */
1434 NULL,
1435 default_symfile_relocate, /* Relocate a debug section. */
1436 &elf_probe_fns, /* sym_probe_fns */
1437 &dwarf2_debug_names_functions
1438 };
1439
1440 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p. */
1441
1442 static const struct gnu_ifunc_fns elf_gnu_ifunc_fns =
1443 {
1444 elf_gnu_ifunc_resolve_addr,
1445 elf_gnu_ifunc_resolve_name,
1446 elf_gnu_ifunc_resolver_stop,
1447 elf_gnu_ifunc_resolver_return_stop
1448 };
1449
1450 void
1451 _initialize_elfread (void)
1452 {
1453 probe_key = register_bfd_data_with_cleanup (NULL, probe_key_free);
1454 add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns);
1455
1456 elf_objfile_gnu_ifunc_cache_data = register_objfile_data ();
1457 gnu_ifunc_fns_p = &elf_gnu_ifunc_fns;
1458 }
frame_id_p
int frame_id_p(struct frame_id l)
Definition: frame.c:646
gdbarch
Definition: gdbarch.c:127
minimal_symbol_reader::install
void install()
Definition: minsyms.c:1346
objfile::flags
objfile_flags flags
Definition: objfiles.h:311
string
const char * string
Definition: signals.c:50
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Definition: probe.h:112
OBJF_READNEVER
Definition: objfile-flags.h:70
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bp_location * loc
Definition: breakpoint.h:702
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bool dwarf2_initialize_objfile(struct objfile *objfile, dw_index_kind *index_kind)
Definition: dwarf2read.c:6467
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void stabsread_new_init(void)
Definition: stabsread.c:4769
extract_typed_address
CORE_ADDR extract_typed_address(const gdb_byte *buf, struct type *type)
Definition: findvar.c:154
gdb-stabs.h
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dwarf2_has_info
int dwarf2_has_info(struct objfile *objfile, const struct dwarf2_debug_sections *names)
Definition: dwarf2read.c:2424
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void objfile_set_sym_fns(struct objfile *objfile, const struct sym_fns *sf)
Definition: symfile-debug.c:660
ST_DYNAMIC
#define ST_DYNAMIC
Definition: elfread.c:224
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bfd * obfd
Definition: objfiles.h:342
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static const struct sym_fns elf_sym_fns
Definition: elfread.c:1373
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Definition: frame.c:2376
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Definition: breakpoint.h:193
get_current_frame
struct frame_info * get_current_frame(void)
Definition: frame.c:1563
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static struct symfile_segment_data * elf_symfile_segments(bfd *abfd)
Definition: elfread.c:80
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Definition: common-types.h:41
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Definition: symtab.h:587
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Definition: breakpoint.h:70
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char * find_separate_debug_file_by_buildid(struct objfile *objfile)
Definition: build-id.c:146
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struct regcache * get_thread_regcache(ptid_t ptid)
Definition: regcache.c:434
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int gdb_bfd_section_index(bfd *abfd, asection *section)
Definition: gdb_bfd.c:888
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void xfree(void *)
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struct objfile * separate_debug_objfile_backlink
Definition: objfiles.h:441
dummy_obstack_deallocate
void dummy_obstack_deallocate(void *object, void *data)
Definition: utils.c:3031
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program_space * pspace
Definition: breakpoint.h:727
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Definition: breakpoint.h:187
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struct frame_info * get_prev_frame(struct frame_info *this_frame)
Definition: frame.c:2254
BMSYMBOL_VALUE_ADDRESS
#define BMSYMBOL_VALUE_ADDRESS(symbol)
Definition: symtab.h:691
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void warning(const char *fmt,...)
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CORE_ADDR * segment_bases
Definition: symfile.h:85
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static const struct bfd_data * probe_key
Definition: elfread.c:68
ST_SYNTHETIC
#define ST_SYNTHETIC
Definition: elfread.c:225
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const struct builtin_type * builtin_type(struct gdbarch *gdbarch)
Definition: gdbtypes.c:5217
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static int elf_gnu_ifunc_record_cache(const char *name, CORE_ADDR addr)
Definition: elfread.c:657
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struct frame_id get_stack_frame_id(struct frame_info *next_frame)
Definition: frame.c:549
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static const struct sym_probe_fns elf_probe_fns
Definition: elfread.c:1366
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void * memset(T *s, int c, size_t n)=delete
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void internal_error(const char *file, int line, const char *fmt,...)
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Definition: symfile.c:1790
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struct type * builtin_func_func
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const struct gnu_ifunc_fns * gnu_ifunc_fns_p
Definition: minsyms.c:1003
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Definition: breakpoint.h:448
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CORE_ADDR addr
Definition: elfread.c:619
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static void probe_key_free(bfd *abfd, void *d)
Definition: elfread.c:1352
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static int elf_gnu_ifunc_resolve_by_cache(const char *name, CORE_ADDR *addr_p)
Definition: elfread.c:732
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SYMBOL_GOT_PLT_SUFFIX
#define SYMBOL_GOT_PLT_SUFFIX
Definition: elfread.c:75
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Definition: frame.c:85
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Definition: symtab.h:588
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gdb_bfd_ref_ptr symfile_bfd_open(const char *name)
Definition: symfile.c:1719
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void dwarf2_build_psymtabs(struct objfile *objfile)
Definition: dwarf2read.c:6519
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struct obj_section * section
Definition: symtab.h:1753
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Definition: symtab.h:583
_
#define _(String)
Definition: gdb_locale.h:35
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Definition: symtab.h:601
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static const struct gnu_ifunc_fns elf_gnu_ifunc_fns
Definition: elfread.c:1442
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breakpoint * related_breakpoint
Definition: breakpoint.h:759
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Definition: gdbtypes.h:1495
VALUE_LVAL
#define VALUE_LVAL(val)
Definition: value.h:414
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struct objfile_per_bfd_storage * per_bfd
Definition: objfiles.h:347
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struct value * allocate_value(struct type *type)
Definition: value.c:1036
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int * segment_info
Definition: symfile.h:95
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dw_index_kind
Definition: symfile.h:607
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gdbarch_elf_make_msymbol_special
void gdbarch_elf_make_msymbol_special(struct gdbarch *gdbarch, asymbol *sym, struct minimal_symbol *msym)
Definition: gdbarch.c:3381
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const char * paddress(struct gdbarch *gdbarch, CORE_ADDR addr)
Definition: utils.c:2745
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static int elf_gnu_ifunc_cache_eq(const void *a_voidp, const void *b_voidp)
Definition: elfread.c:638
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struct minimal_symbol * record_full(const char *name, int name_len, bool copy_name, CORE_ADDR address, enum minimal_symbol_type ms_type, int section)
Definition: minsyms.c:1116
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struct obj_section * find_pc_overlay(CORE_ADDR pc)
Definition: symfile.c:3173
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bool minsyms_read
Definition: objfiles.h:260
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void set_value_address(struct value *value, CORE_ADDR addr)
Definition: value.c:1553
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Definition: inferior.h:349
MSYMBOL_OBJ_SECTION
#define MSYMBOL_OBJ_SECTION(objfile, symbol)
Definition: symtab.h:700
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#define XCNEWVEC(T, N)
Definition: poison.h:157
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int frame_id_eq(struct frame_id l, struct frame_id r)
Definition: frame.c:674
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int objfile_has_partial_symbols(struct objfile *objfile)
Definition: objfiles.c:979
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const char *const name
Definition: aarch64-tdep.c:76
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static void elf_read_minimal_symbols(struct objfile *objfile, int symfile_flags, const struct elfinfo *ei)
Definition: elfread.c:1004
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unsigned int created_by_gdb
Definition: symtab.h:648
default_symfile_relocate
bfd_byte * default_symfile_relocate(struct objfile *objfile, asection *sectp, bfd_byte *buf)
Definition: symfile.c:3625
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int gdbarch_record_special_symbol_p(struct gdbarch *gdbarch)
Definition: gdbarch.c:4240
OBJF_REORDERED
Definition: objfile-flags.h:36
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Definition: gdb_ref_ptr.h:49
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Definition: elfread.c:616
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static void read_psyms(struct objfile *objfile)
Definition: elfread.c:1281
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bptype type
Definition: breakpoint.h:693
gdb::unique_xmalloc_ptr
std::unique_ptr< T, xfree_deleter< T > > unique_xmalloc_ptr
Definition: gdb_unique_ptr.h:48
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void dwarf2_free_objfile(struct objfile *objfile)
Definition: dwarf2read.c:25113
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struct target_ops current_target
gdbarch_addr_bits_remove
CORE_ADDR gdbarch_addr_bits_remove(struct gdbarch *gdbarch, CORE_ADDR addr)
Definition: gdbarch.c:3208
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struct symtab_and_line find_pc_line(CORE_ADDR pc, int notcurrent)
Definition: symtab.c:3288
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Definition: symfile.h:302
elf_symfile_finish
static void elf_symfile_finish(struct objfile *objfile)
Definition: elfread.c:1307
objfile::objfile
objfile(bfd *, const char *, objfile_flags)
Definition: objfiles.c:373
mst_data
Definition: symtab.h:586
mst_slot_got_plt
Definition: symtab.h:585
symfile_segment_data::num_segments
int num_segments
Definition: symfile.h:81
elf_locate_sections
static void elf_locate_sections(bfd *ignore_abfd, asection *sectp, void *eip)
Definition: elfread.c:177
elf_gnu_ifunc_resolver_stop
static void elf_gnu_ifunc_resolver_stop(struct breakpoint *b)
Definition: elfread.c:893
regcache.h
buildsym.h
bound_minimal_symbol
Definition: minsyms.h:29
minimal_symbol::filename
const char * filename
Definition: symtab.h:640
gdbarch_convert_from_func_ptr_addr
CORE_ADDR gdbarch_convert_from_func_ptr_addr(struct gdbarch *gdbarch, CORE_ADDR addr, struct target_ops *targ)
Definition: gdbarch.c:3191
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void fprintf_unfiltered(struct ui_file *stream, const char *format,...)
Definition: utils.c:2018
elf_rel_plt_read
static void elf_rel_plt_read(minimal_symbol_reader &reader, struct objfile *objfile, asymbol **dyn_symbol_table)
Definition: elfread.c:533
target_auxv_search
int target_auxv_search(struct target_ops *ops, CORE_ADDR match, CORE_ADDR *valp)
Definition: auxv.c:375
MSYMBOL_SIZE
#define MSYMBOL_SIZE(msymbol)
Definition: symtab.h:672
elf_gnu_ifunc_resolve_name
static int elf_gnu_ifunc_resolve_name(const char *name, CORE_ADDR *addr_p)
Definition: elfread.c:830
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void buildsym_new_init(void)
Definition: buildsym.c:1779
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Definition: breakpoint.h:684
elf_gnu_ifunc_resolver_return_stop
static void elf_gnu_ifunc_resolver_return_stop(struct breakpoint *b)
Definition: elfread.c:944
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struct gdbarch * get_objfile_arch(const struct objfile *objfile)
Definition: objfiles.c:445
ptid_to_global_thread_id
int ptid_to_global_thread_id(ptid_t ptid)
Definition: thread.c:605
update_breakpoint_locations
void update_breakpoint_locations(struct breakpoint *b, struct program_space *filter_pspace, gdb::array_view< const symtab_and_line > sals, gdb::array_view< const symtab_and_line > sals_end)
Definition: breakpoint.c:13646
elf_symfile_init
static void elf_symfile_init(struct objfile *objfile)
Definition: elfread.c:1315
type
Definition: gdbtypes.h:749
find_pc_partial_function
int find_pc_partial_function(CORE_ADDR pc, const char **name, CORE_ADDR *address, CORE_ADDR *endaddr)
Definition: blockframe.c:320
elf_sym_fns_debug_names
const struct sym_fns elf_sym_fns_debug_names
Definition: elfread.c:1425
psympriv.h
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bp_location * next
Definition: breakpoint.h:324
objfile::separate_debug_objfile
struct objfile * separate_debug_objfile
Definition: objfiles.h:436
elf_objfile_gnu_ifunc_cache_data
static const struct objfile_data * elf_objfile_gnu_ifunc_cache_data
Definition: elfread.c:612
gdbarch_return_value
enum return_value_convention gdbarch_return_value(struct gdbarch *gdbarch, struct value *function, struct type *valtype, struct regcache *regcache, gdb_byte *readbuf, const gdb_byte *writebuf)
Definition: gdbarch.c:2728
find_separate_debug_file_by_debuglink
char * find_separate_debug_file_by_debuglink(struct objfile *objfile)
Definition: symfile.c:1551
_initialize_elfread
void _initialize_elfread(void)
Definition: elfread.c:1451
elf_sym_fns_lazy_psyms
const struct sym_fns elf_sym_fns_lazy_psyms
Definition: elfread.c:1391
value_from_longest
struct value * value_from_longest(struct type *type, LONGEST num)
Definition: value.c:3534
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static int startswith(const char *string, const char *pattern)
Definition: common-utils.h:107
SET_MSYMBOL_SIZE
#define SET_MSYMBOL_SIZE(msymbol, sz)
Definition: symtab.h:673
static_probe_ops
Definition: probe.h:52
event_location_to_string
const char * event_location_to_string(struct event_location *location)
Definition: location.c:397
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void elfmdebug_build_psymtabs(struct objfile *objfile, const struct ecoff_debug_swap *swap, asection *sec)
Definition: mdebugread.c:4868
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const char * objfile_name(const struct objfile *objfile)
Definition: objfiles.c:1557
dwarf2_debug_names_functions
const struct quick_symbol_functions dwarf2_debug_names_functions
Definition: dwarf2read.c:6444
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Definition: symfile.h:76
complaints.h
gdb_assert
#define gdb_assert(expr)
Definition: gdb_assert.h:32
value
Definition: value.c:169
gdbarch_record_special_symbol
void gdbarch_record_special_symbol(struct gdbarch *gdbarch, struct objfile *objfile, asymbol *sym)
Definition: gdbarch.c:4247
hashtab_obstack_allocate
void * hashtab_obstack_allocate(void *data, size_t size, size_t count)
Definition: utils.c:3016
all_static_probe_ops
std::vector< const static_probe_ops * > all_static_probe_ops
Definition: probe.c:882
objfile
Definition: objfiles.h:286
symtab_and_line
Definition: symtab.h:1746
gdb_byte
bfd_byte gdb_byte
Definition: common-types.h:38
record_minimal_symbol
static struct minimal_symbol * record_minimal_symbol(minimal_symbol_reader &reader, const char *name, int name_len, bool copy_name, CORE_ADDR address, enum minimal_symbol_type ms_type, asection *bfd_section, struct objfile *objfile)
Definition: elfread.c:193
gnu_ifunc_fns
Definition: symtab.h:1720
elf_sym_fns_gdb_index
const struct sym_fns elf_sym_fns_gdb_index
Definition: elfread.c:1408
MSYMBOL_TYPE
#define MSYMBOL_TYPE(msymbol)
Definition: symtab.h:680
bcache.h
elf_gnu_ifunc_resolve_addr
static CORE_ADDR elf_gnu_ifunc_resolve_addr(struct gdbarch *gdbarch, CORE_ADDR pc)
Definition: elfread.c:847
set_momentary_breakpoint
breakpoint_up set_momentary_breakpoint(struct gdbarch *gdbarch, struct symtab_and_line sal, struct frame_id frame_id, enum bptype type)
Definition: breakpoint.c:8545
TYPE_TARGET_TYPE
#define TYPE_TARGET_TYPE(thistype)
Definition: gdbtypes.h:1226
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int thread
Definition: breakpoint.h:763
elf_symfile_read
static void elf_symfile_read(struct objfile *objfile, symfile_add_flags symfile_flags)
Definition: elfread.c:1168
lookup_minimal_symbol_by_pc
struct bound_minimal_symbol lookup_minimal_symbol_by_pc(CORE_ADDR pc)
Definition: minsyms.c:928
objfile_per_bfd_storage::filename_cache
bcache * filename_cache
Definition: objfiles.h:199
elfinfo
Definition: elfread.c:60
XCNEW
#define XCNEW(T)
Definition: poison.h:121
breakpoint::location
event_location_up location
Definition: breakpoint.h:730
stabsread.h
target_read_memory
int target_read_memory(CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
Definition: target.c:1370
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ptid_t inferior_ptid
Definition: infcmd.c:94
builtin_type::builtin_data_ptr
struct type * builtin_data_ptr
Definition: gdbtypes.h:1554
bound_minimal_symbol::minsym
struct minimal_symbol * minsym
Definition: minsyms.h:34
psym_functions
const struct quick_symbol_functions psym_functions
Definition: psymtab.c:1541
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struct program_space * pspace
Definition: symtab.h:1749
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Definition: symtab.h:581
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const struct quick_symbol_functions dwarf2_gdb_index_functions
Definition: dwarf2read.c:5615
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Definition: breakpoint.h:453
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Definition: bcache.c:57
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Definition: gdbarch.c:3374
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Definition: symtab.h:582
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CORE_ADDR pc
Definition: symtab.h:1759
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static const std::vector< probe * > & elf_get_probes(struct objfile *objfile)
Definition: elfread.c:1326
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Definition: symfile.c:695
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Definition: elfread.c:621
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Definition: gdb_ref_ptr.h:130
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Definition: symtab.h:597
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Definition: elfread.c:223
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Definition: elfread.c:63
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Definition: inferior.c:58
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Definition: elfread.c:773
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Definition: progspace.c:35
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Definition: symtab.c:215
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Definition: corelow.c:879
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Definition: infcall.c:690
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Definition: regcache.h:232
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Definition: gdb-stabs.h:37
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Definition: utils.h:349
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Definition: gdb_obstack.h:48
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Definition: value.c:1095
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Definition: dbxread.c:3152
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Definition: dbxread.c:64
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Definition: elfread.c:1295
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Definition: value.c:2762
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Definition: gdb-stabs.h:41
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Definition: value.c:1158
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Definition: gdbtypes.h:1235
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Definition: symtab.h:623
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Definition: elfread.c:228
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Definition: minsyms.h:39
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Definition: value.c:208
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Definition: symtab.h:602
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Definition: objfiles.h:357
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Definition: symtab.h:579
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Definition: minsyms.h:62
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Definition: minsyms.c:311
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Definition: symfile.h:89
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Definition: elfread.c:62
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Definition: objfiles.h:579
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Definition: breakpoint.c:13226
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Definition: errors.c:38
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Definition: frame.h:111
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Definition: frame.c:2691
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Definition: symtab.h:1761
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Definition: symtab.h:600
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Definition: breakpoint.h:722
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Definition: symfile.c:1230
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Definition: symfile.h:293