1 /* Read ELF (Executable and Linking Format) object files for GDB.
3 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
5 Free Software Foundation, Inc.
7 Written by Fred Fish at Cygnus Support.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "gdb_string.h"
28 #include "elf/common.h"
29 #include "elf/internal.h"
35 #include "stabsread.h"
36 #include "gdb-stabs.h"
37 #include "complaints.h"
40 extern void _initialize_elfread (void);
42 /* The struct elfinfo is available only during ELF symbol table and
43 psymtab reading. It is destroyed at the completion of psymtab-reading.
44 It's local to elf_symfile_read. */
48 asection
*stabsect
; /* Section pointer for .stab section */
49 asection
*stabindexsect
; /* Section pointer for .stab.index section */
50 asection
*mdebugsect
; /* Section pointer for .mdebug section */
53 static void free_elfinfo (void *);
55 /* Locate the segments in ABFD. */
57 static struct symfile_segment_data
*
58 elf_symfile_segments (bfd
*abfd
)
60 Elf_Internal_Phdr
*phdrs
, **segments
;
62 int num_phdrs
, num_segments
, num_sections
, i
;
64 struct symfile_segment_data
*data
;
66 phdrs_size
= bfd_get_elf_phdr_upper_bound (abfd
);
70 phdrs
= alloca (phdrs_size
);
71 num_phdrs
= bfd_get_elf_phdrs (abfd
, phdrs
);
76 segments
= alloca (sizeof (Elf_Internal_Phdr
*) * num_phdrs
);
77 for (i
= 0; i
< num_phdrs
; i
++)
78 if (phdrs
[i
].p_type
== PT_LOAD
)
79 segments
[num_segments
++] = &phdrs
[i
];
81 if (num_segments
== 0)
84 data
= XZALLOC (struct symfile_segment_data
);
85 data
->num_segments
= num_segments
;
86 data
->segment_bases
= XCALLOC (num_segments
, CORE_ADDR
);
87 data
->segment_sizes
= XCALLOC (num_segments
, CORE_ADDR
);
89 for (i
= 0; i
< num_segments
; i
++)
91 data
->segment_bases
[i
] = segments
[i
]->p_vaddr
;
92 data
->segment_sizes
[i
] = segments
[i
]->p_memsz
;
95 num_sections
= bfd_count_sections (abfd
);
96 data
->segment_info
= XCALLOC (num_sections
, int);
98 for (i
= 0, sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
103 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
106 vma
= bfd_get_section_vma (abfd
, sect
);
108 for (j
= 0; j
< num_segments
; j
++)
109 if (segments
[j
]->p_memsz
> 0
110 && vma
>= segments
[j
]->p_vaddr
111 && (vma
- segments
[j
]->p_vaddr
) < segments
[j
]->p_memsz
)
113 data
->segment_info
[i
] = j
+ 1;
117 /* We should have found a segment for every non-empty section.
118 If we haven't, we will not relocate this section by any
119 offsets we apply to the segments. As an exception, do not
120 warn about SHT_NOBITS sections; in normal ELF execution
121 environments, SHT_NOBITS means zero-initialized and belongs
122 in a segment, but in no-OS environments some tools (e.g. ARM
123 RealView) use SHT_NOBITS for uninitialized data. Since it is
124 uninitialized, it doesn't need a program header. Such
125 binaries are not relocatable. */
126 if (bfd_get_section_size (sect
) > 0 && j
== num_segments
127 && (bfd_get_section_flags (abfd
, sect
) & SEC_LOAD
) != 0)
128 warning (_("Loadable segment \"%s\" outside of ELF segments"),
129 bfd_section_name (abfd
, sect
));
135 /* We are called once per section from elf_symfile_read. We
136 need to examine each section we are passed, check to see
137 if it is something we are interested in processing, and
138 if so, stash away some access information for the section.
140 For now we recognize the dwarf debug information sections and
141 line number sections from matching their section names. The
142 ELF definition is no real help here since it has no direct
143 knowledge of DWARF (by design, so any debugging format can be
146 We also recognize the ".stab" sections used by the Sun compilers
147 released with Solaris 2.
149 FIXME: The section names should not be hardwired strings (what
150 should they be? I don't think most object file formats have enough
151 section flags to specify what kind of debug section it is
155 elf_locate_sections (bfd
*ignore_abfd
, asection
*sectp
, void *eip
)
159 ei
= (struct elfinfo
*) eip
;
160 if (strcmp (sectp
->name
, ".stab") == 0)
162 ei
->stabsect
= sectp
;
164 else if (strcmp (sectp
->name
, ".stab.index") == 0)
166 ei
->stabindexsect
= sectp
;
168 else if (strcmp (sectp
->name
, ".mdebug") == 0)
170 ei
->mdebugsect
= sectp
;
174 static struct minimal_symbol
*
175 record_minimal_symbol (char *name
, CORE_ADDR address
,
176 enum minimal_symbol_type ms_type
,
177 asection
*bfd_section
, struct objfile
*objfile
)
179 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
181 if (ms_type
== mst_text
|| ms_type
== mst_file_text
)
182 address
= gdbarch_smash_text_address (gdbarch
, address
);
184 return prim_record_minimal_symbol_and_info
185 (name
, address
, ms_type
, bfd_section
->index
, bfd_section
, objfile
);
192 elf_symtab_read -- read the symbol table of an ELF file
196 void elf_symtab_read (struct objfile *objfile, int type,
197 long number_of_symbols, asymbol **symbol_table)
201 Given an objfile, a symbol table, and a flag indicating whether the
202 symbol table contains regular, dynamic, or synthetic symbols, add all
203 the global function and data symbols to the minimal symbol table.
205 In stabs-in-ELF, as implemented by Sun, there are some local symbols
206 defined in the ELF symbol table, which can be used to locate
207 the beginnings of sections from each ".o" file that was linked to
208 form the executable objfile. We gather any such info and record it
209 in data structures hung off the objfile's private data.
215 #define ST_SYNTHETIC 2
218 elf_symtab_read (struct objfile
*objfile
, int type
,
219 long number_of_symbols
, asymbol
**symbol_table
)
221 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
227 enum minimal_symbol_type ms_type
;
228 /* If sectinfo is nonNULL, it contains section info that should end up
229 filed in the objfile. */
230 struct stab_section_info
*sectinfo
= NULL
;
231 /* If filesym is nonzero, it points to a file symbol, but we haven't
232 seen any section info for it yet. */
233 asymbol
*filesym
= 0;
234 /* Name of filesym, as saved on the objfile_obstack. */
235 char *filesymname
= obsavestring ("", 0, &objfile
->objfile_obstack
);
236 struct dbx_symfile_info
*dbx
= objfile
->deprecated_sym_stab_info
;
237 int stripped
= (bfd_get_symcount (objfile
->obfd
) == 0);
239 for (i
= 0; i
< number_of_symbols
; i
++)
241 sym
= symbol_table
[i
];
242 if (sym
->name
== NULL
|| *sym
->name
== '\0')
244 /* Skip names that don't exist (shouldn't happen), or names
245 that are null strings (may happen). */
249 /* Skip "special" symbols, e.g. ARM mapping symbols. These are
250 symbols which do not correspond to objects in the symbol table,
251 but have some other target-specific meaning. */
252 if (bfd_is_target_special_symbol (objfile
->obfd
, sym
))
254 if (gdbarch_record_special_symbol_p (gdbarch
))
255 gdbarch_record_special_symbol (gdbarch
, objfile
, sym
);
259 offset
= ANOFFSET (objfile
->section_offsets
, sym
->section
->index
);
260 if (type
== ST_DYNAMIC
261 && sym
->section
== &bfd_und_section
262 && (sym
->flags
& BSF_FUNCTION
))
264 struct minimal_symbol
*msym
;
265 bfd
*abfd
= objfile
->obfd
;
268 /* Symbol is a reference to a function defined in
270 If its value is non zero then it is usually the address
271 of the corresponding entry in the procedure linkage table,
272 plus the desired section offset.
273 If its value is zero then the dynamic linker has to resolve
274 the symbol. We are unable to find any meaningful address
275 for this symbol in the executable file, so we skip it. */
276 symaddr
= sym
->value
;
280 /* sym->section is the undefined section. However, we want to
281 record the section where the PLT stub resides with the
282 minimal symbol. Search the section table for the one that
283 covers the stub's address. */
284 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
286 if ((bfd_get_section_flags (abfd
, sect
) & SEC_ALLOC
) == 0)
289 if (symaddr
>= bfd_get_section_vma (abfd
, sect
)
290 && symaddr
< bfd_get_section_vma (abfd
, sect
)
291 + bfd_get_section_size (sect
))
297 symaddr
+= ANOFFSET (objfile
->section_offsets
, sect
->index
);
299 msym
= record_minimal_symbol
300 ((char *) sym
->name
, symaddr
, mst_solib_trampoline
, sect
, objfile
);
302 msym
->filename
= filesymname
;
306 /* If it is a nonstripped executable, do not enter dynamic
307 symbols, as the dynamic symbol table is usually a subset
308 of the main symbol table. */
309 if (type
== ST_DYNAMIC
&& !stripped
)
311 if (sym
->flags
& BSF_FILE
)
313 /* STT_FILE debugging symbol that helps stabs-in-elf debugging.
314 Chain any old one onto the objfile; remember new sym. */
315 if (sectinfo
!= NULL
)
317 sectinfo
->next
= dbx
->stab_section_info
;
318 dbx
->stab_section_info
= sectinfo
;
323 obsavestring ((char *) filesym
->name
, strlen (filesym
->name
),
324 &objfile
->objfile_obstack
);
326 else if (sym
->flags
& BSF_SECTION_SYM
)
328 else if (sym
->flags
& (BSF_GLOBAL
| BSF_LOCAL
| BSF_WEAK
))
330 struct minimal_symbol
*msym
;
332 /* Select global/local/weak symbols. Note that bfd puts abs
333 symbols in their own section, so all symbols we are
334 interested in will have a section. */
335 /* Bfd symbols are section relative. */
336 symaddr
= sym
->value
+ sym
->section
->vma
;
337 /* Relocate all non-absolute and non-TLS symbols by the
339 if (sym
->section
!= &bfd_abs_section
340 && !(sym
->section
->flags
& SEC_THREAD_LOCAL
))
344 /* For non-absolute symbols, use the type of the section
345 they are relative to, to intuit text/data. Bfd provides
346 no way of figuring this out for absolute symbols. */
347 if (sym
->section
== &bfd_abs_section
)
349 /* This is a hack to get the minimal symbol type
350 right for Irix 5, which has absolute addresses
351 with special section indices for dynamic symbols.
353 NOTE: uweigand-20071112: Synthetic symbols do not
354 have an ELF-private part, so do not touch those. */
355 unsigned int shndx
= type
== ST_SYNTHETIC
? 0 :
356 ((elf_symbol_type
*) sym
)->internal_elf_sym
.st_shndx
;
366 case SHN_MIPS_ACOMMON
:
373 /* If it is an Irix dynamic symbol, skip section name
374 symbols, relocate all others by section offset. */
375 if (ms_type
!= mst_abs
)
377 if (sym
->name
[0] == '.')
382 else if (sym
->section
->flags
& SEC_CODE
)
384 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
))
388 else if ((sym
->name
[0] == '.' && sym
->name
[1] == 'L')
389 || ((sym
->flags
& BSF_LOCAL
)
390 && sym
->name
[0] == '$'
391 && sym
->name
[1] == 'L'))
392 /* Looks like a compiler-generated label. Skip
393 it. The assembler should be skipping these (to
394 keep executables small), but apparently with
395 gcc on the (deleted) delta m88k SVR4, it loses.
396 So to have us check too should be harmless (but
397 I encourage people to fix this in the assembler
398 instead of adding checks here). */
402 ms_type
= mst_file_text
;
405 else if (sym
->section
->flags
& SEC_ALLOC
)
407 if (sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
))
409 if (sym
->section
->flags
& SEC_LOAD
)
418 else if (sym
->flags
& BSF_LOCAL
)
420 /* Named Local variable in a Data section.
421 Check its name for stabs-in-elf. */
422 int special_local_sect
;
423 if (strcmp ("Bbss.bss", sym
->name
) == 0)
424 special_local_sect
= SECT_OFF_BSS (objfile
);
425 else if (strcmp ("Ddata.data", sym
->name
) == 0)
426 special_local_sect
= SECT_OFF_DATA (objfile
);
427 else if (strcmp ("Drodata.rodata", sym
->name
) == 0)
428 special_local_sect
= SECT_OFF_RODATA (objfile
);
430 special_local_sect
= -1;
431 if (special_local_sect
>= 0)
433 /* Found a special local symbol. Allocate a
434 sectinfo, if needed, and fill it in. */
435 if (sectinfo
== NULL
)
440 max_index
= SECT_OFF_BSS (objfile
);
441 if (objfile
->sect_index_data
> max_index
)
442 max_index
= objfile
->sect_index_data
;
443 if (objfile
->sect_index_rodata
> max_index
)
444 max_index
= objfile
->sect_index_rodata
;
446 /* max_index is the largest index we'll
447 use into this array, so we must
448 allocate max_index+1 elements for it.
449 However, 'struct stab_section_info'
450 already includes one element, so we
451 need to allocate max_index aadditional
453 size
= (sizeof (struct stab_section_info
)
454 + (sizeof (CORE_ADDR
)
456 sectinfo
= (struct stab_section_info
*)
458 memset (sectinfo
, 0, size
);
459 sectinfo
->num_sections
= max_index
;
462 complaint (&symfile_complaints
,
463 _("elf/stab section information %s without a preceding file symbol"),
469 (char *) filesym
->name
;
472 if (sectinfo
->sections
[special_local_sect
] != 0)
473 complaint (&symfile_complaints
,
474 _("duplicated elf/stab section information for %s"),
476 /* BFD symbols are section relative. */
477 symaddr
= sym
->value
+ sym
->section
->vma
;
478 /* Relocate non-absolute symbols by the
480 if (sym
->section
!= &bfd_abs_section
)
482 sectinfo
->sections
[special_local_sect
] = symaddr
;
483 /* The special local symbols don't go in the
484 minimal symbol table, so ignore this one. */
487 /* Not a special stabs-in-elf symbol, do regular
488 symbol processing. */
489 if (sym
->section
->flags
& SEC_LOAD
)
491 ms_type
= mst_file_data
;
495 ms_type
= mst_file_bss
;
500 ms_type
= mst_unknown
;
505 /* FIXME: Solaris2 shared libraries include lots of
506 odd "absolute" and "undefined" symbols, that play
507 hob with actions like finding what function the PC
508 is in. Ignore them if they aren't text, data, or bss. */
509 /* ms_type = mst_unknown; */
510 continue; /* Skip this symbol. */
512 msym
= record_minimal_symbol
513 ((char *) sym
->name
, symaddr
,
514 ms_type
, sym
->section
, objfile
);
518 /* Pass symbol size field in via BFD. FIXME!!! */
519 elf_symbol_type
*elf_sym
;
521 /* NOTE: uweigand-20071112: A synthetic symbol does not have an
522 ELF-private part. However, in some cases (e.g. synthetic
523 'dot' symbols on ppc64) the udata.p entry is set to point back
524 to the original ELF symbol it was derived from. Get the size
526 if (type
!= ST_SYNTHETIC
)
527 elf_sym
= (elf_symbol_type
*) sym
;
529 elf_sym
= (elf_symbol_type
*) sym
->udata
.p
;
532 MSYMBOL_SIZE(msym
) = elf_sym
->internal_elf_sym
.st_size
;
535 msym
->filename
= filesymname
;
536 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, msym
);
538 /* For @plt symbols, also record a trampoline to the
539 destination symbol. The @plt symbol will be used in
540 disassembly, and the trampoline will be used when we are
541 trying to find the target. */
542 if (msym
&& ms_type
== mst_text
&& type
== ST_SYNTHETIC
)
544 int len
= strlen (sym
->name
);
546 if (len
> 4 && strcmp (sym
->name
+ len
- 4, "@plt") == 0)
548 char *base_name
= xmalloc (len
- 4 + 1);
549 struct minimal_symbol
*mtramp
;
551 memcpy (base_name
, sym
->name
, len
- 4);
552 base_name
[len
- 4] = '\0';
553 mtramp
= record_minimal_symbol (base_name
, symaddr
,
554 mst_solib_trampoline
,
555 sym
->section
, objfile
);
559 MSYMBOL_SIZE (mtramp
) = MSYMBOL_SIZE (msym
);
560 mtramp
->filename
= filesymname
;
561 gdbarch_elf_make_msymbol_special (gdbarch
, sym
, mtramp
);
569 /* Scan and build partial symbols for a symbol file.
570 We have been initialized by a call to elf_symfile_init, which
571 currently does nothing.
573 SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
574 in each section. We simplify it down to a single offset for all
577 MAINLINE is true if we are reading the main symbol
578 table (as opposed to a shared lib or dynamically loaded file).
580 This function only does the minimum work necessary for letting the
581 user "name" things symbolically; it does not read the entire symtab.
582 Instead, it reads the external and static symbols and puts them in partial
583 symbol tables. When more extensive information is requested of a
584 file, the corresponding partial symbol table is mutated into a full
585 fledged symbol table by going back and reading the symbols
588 We look for sections with specific names, to tell us what debug
589 format to look for: FIXME!!!
591 elfstab_build_psymtabs() handles STABS symbols;
592 mdebug_build_psymtabs() handles ECOFF debugging information.
594 Note that ELF files have a "minimal" symbol table, which looks a lot
595 like a COFF symbol table, but has only the minimal information necessary
596 for linking. We process this also, and use the information to
597 build gdb's minimal symbol table. This gives us some minimal debugging
598 capability even for files compiled without -g. */
601 elf_symfile_read (struct objfile
*objfile
, int mainline
)
603 bfd
*abfd
= objfile
->obfd
;
605 struct cleanup
*back_to
;
607 long symcount
= 0, dynsymcount
= 0, synthcount
, storage_needed
;
608 asymbol
**symbol_table
= NULL
, **dyn_symbol_table
= NULL
;
611 init_minimal_symbol_collection ();
612 back_to
= make_cleanup_discard_minimal_symbols ();
614 memset ((char *) &ei
, 0, sizeof (ei
));
616 /* Allocate struct to keep track of the symfile */
617 objfile
->deprecated_sym_stab_info
= (struct dbx_symfile_info
*)
618 xmalloc (sizeof (struct dbx_symfile_info
));
619 memset ((char *) objfile
->deprecated_sym_stab_info
, 0, sizeof (struct dbx_symfile_info
));
620 make_cleanup (free_elfinfo
, (void *) objfile
);
622 /* Process the normal ELF symbol table first. This may write some
623 chain of info into the dbx_symfile_info in objfile->deprecated_sym_stab_info,
624 which can later be used by elfstab_offset_sections. */
626 storage_needed
= bfd_get_symtab_upper_bound (objfile
->obfd
);
627 if (storage_needed
< 0)
628 error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile
->obfd
),
629 bfd_errmsg (bfd_get_error ()));
631 if (storage_needed
> 0)
633 symbol_table
= (asymbol
**) xmalloc (storage_needed
);
634 make_cleanup (xfree
, symbol_table
);
635 symcount
= bfd_canonicalize_symtab (objfile
->obfd
, symbol_table
);
638 error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile
->obfd
),
639 bfd_errmsg (bfd_get_error ()));
641 elf_symtab_read (objfile
, ST_REGULAR
, symcount
, symbol_table
);
644 /* Add the dynamic symbols. */
646 storage_needed
= bfd_get_dynamic_symtab_upper_bound (objfile
->obfd
);
648 if (storage_needed
> 0)
650 dyn_symbol_table
= (asymbol
**) xmalloc (storage_needed
);
651 make_cleanup (xfree
, dyn_symbol_table
);
652 dynsymcount
= bfd_canonicalize_dynamic_symtab (objfile
->obfd
,
656 error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile
->obfd
),
657 bfd_errmsg (bfd_get_error ()));
659 elf_symtab_read (objfile
, ST_DYNAMIC
, dynsymcount
, dyn_symbol_table
);
662 /* Add synthetic symbols - for instance, names for any PLT entries. */
664 synthcount
= bfd_get_synthetic_symtab (abfd
, symcount
, symbol_table
,
665 dynsymcount
, dyn_symbol_table
,
669 asymbol
**synth_symbol_table
;
672 make_cleanup (xfree
, synthsyms
);
673 synth_symbol_table
= xmalloc (sizeof (asymbol
*) * synthcount
);
674 for (i
= 0; i
< synthcount
; i
++)
675 synth_symbol_table
[i
] = synthsyms
+ i
;
676 make_cleanup (xfree
, synth_symbol_table
);
677 elf_symtab_read (objfile
, ST_SYNTHETIC
, synthcount
, synth_symbol_table
);
680 /* Install any minimal symbols that have been collected as the current
681 minimal symbols for this objfile. The debug readers below this point
682 should not generate new minimal symbols; if they do it's their
683 responsibility to install them. "mdebug" appears to be the only one
684 which will do this. */
686 install_minimal_symbols (objfile
);
687 do_cleanups (back_to
);
689 /* Now process debugging information, which is contained in
690 special ELF sections. */
692 /* If we are reinitializing, or if we have never loaded syms yet,
693 set table to empty. MAINLINE is cleared so that *_read_psymtab
694 functions do not all also re-initialize the psymbol table. */
697 init_psymbol_list (objfile
, 0);
701 /* We first have to find them... */
702 bfd_map_over_sections (abfd
, elf_locate_sections
, (void *) & ei
);
704 /* ELF debugging information is inserted into the psymtab in the
705 order of least informative first - most informative last. Since
706 the psymtab table is searched `most recent insertion first' this
707 increases the probability that more detailed debug information
708 for a section is found.
710 For instance, an object file might contain both .mdebug (XCOFF)
711 and .debug_info (DWARF2) sections then .mdebug is inserted first
712 (searched last) and DWARF2 is inserted last (searched first). If
713 we don't do this then the XCOFF info is found first - for code in
714 an included file XCOFF info is useless. */
718 const struct ecoff_debug_swap
*swap
;
720 /* .mdebug section, presumably holding ECOFF debugging
722 swap
= get_elf_backend_data (abfd
)->elf_backend_ecoff_debug_swap
;
724 elfmdebug_build_psymtabs (objfile
, swap
, ei
.mdebugsect
);
730 /* Stab sections have an associated string table that looks like
731 a separate section. */
732 str_sect
= bfd_get_section_by_name (abfd
, ".stabstr");
734 /* FIXME should probably warn about a stab section without a stabstr. */
736 elfstab_build_psymtabs (objfile
,
740 bfd_section_size (abfd
, str_sect
));
742 if (dwarf2_has_info (objfile
))
744 /* DWARF 2 sections */
745 dwarf2_build_psymtabs (objfile
, mainline
);
748 /* FIXME: kettenis/20030504: This still needs to be integrated with
749 dwarf2read.c in a better way. */
750 dwarf2_build_frame_info (objfile
);
753 /* This cleans up the objfile's deprecated_sym_stab_info pointer, and
754 the chain of stab_section_info's, that might be dangling from
758 free_elfinfo (void *objp
)
760 struct objfile
*objfile
= (struct objfile
*) objp
;
761 struct dbx_symfile_info
*dbxinfo
= objfile
->deprecated_sym_stab_info
;
762 struct stab_section_info
*ssi
, *nssi
;
764 ssi
= dbxinfo
->stab_section_info
;
772 dbxinfo
->stab_section_info
= 0; /* Just say No mo info about this. */
776 /* Initialize anything that needs initializing when a completely new symbol
777 file is specified (not just adding some symbols from another file, e.g. a
780 We reinitialize buildsym, since we may be reading stabs from an ELF file. */
783 elf_new_init (struct objfile
*ignore
)
785 stabsread_new_init ();
786 buildsym_new_init ();
789 /* Perform any local cleanups required when we are done with a particular
790 objfile. I.E, we are in the process of discarding all symbol information
791 for an objfile, freeing up all memory held for it, and unlinking the
792 objfile struct from the global list of known objfiles. */
795 elf_symfile_finish (struct objfile
*objfile
)
797 if (objfile
->deprecated_sym_stab_info
!= NULL
)
799 xfree (objfile
->deprecated_sym_stab_info
);
802 dwarf2_free_objfile (objfile
);
805 /* ELF specific initialization routine for reading symbols.
807 It is passed a pointer to a struct sym_fns which contains, among other
808 things, the BFD for the file whose symbols are being read, and a slot for
809 a pointer to "private data" which we can fill with goodies.
811 For now at least, we have nothing in particular to do, so this function is
815 elf_symfile_init (struct objfile
*objfile
)
817 /* ELF objects may be reordered, so set OBJF_REORDERED. If we
818 find this causes a significant slowdown in gdb then we could
819 set it in the debug symbol readers only when necessary. */
820 objfile
->flags
|= OBJF_REORDERED
;
823 /* When handling an ELF file that contains Sun STABS debug info,
824 some of the debug info is relative to the particular chunk of the
825 section that was generated in its individual .o file. E.g.
826 offsets to static variables are relative to the start of the data
827 segment *for that module before linking*. This information is
828 painfully squirreled away in the ELF symbol table as local symbols
829 with wierd names. Go get 'em when needed. */
832 elfstab_offset_sections (struct objfile
*objfile
, struct partial_symtab
*pst
)
834 char *filename
= pst
->filename
;
835 struct dbx_symfile_info
*dbx
= objfile
->deprecated_sym_stab_info
;
836 struct stab_section_info
*maybe
= dbx
->stab_section_info
;
837 struct stab_section_info
*questionable
= 0;
841 /* The ELF symbol info doesn't include path names, so strip the path
842 (if any) from the psymtab filename. */
843 while (0 != (p
= strchr (filename
, '/')))
846 /* FIXME: This linear search could speed up significantly
847 if it was chained in the right order to match how we search it,
848 and if we unchained when we found a match. */
849 for (; maybe
; maybe
= maybe
->next
)
851 if (filename
[0] == maybe
->filename
[0]
852 && strcmp (filename
, maybe
->filename
) == 0)
854 /* We found a match. But there might be several source files
855 (from different directories) with the same name. */
856 if (0 == maybe
->found
)
858 questionable
= maybe
; /* Might use it later. */
862 if (maybe
== 0 && questionable
!= 0)
864 complaint (&symfile_complaints
,
865 _("elf/stab section information questionable for %s"), filename
);
866 maybe
= questionable
;
871 /* Found it! Allocate a new psymtab struct, and fill it in. */
873 pst
->section_offsets
= (struct section_offsets
*)
874 obstack_alloc (&objfile
->objfile_obstack
,
875 SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
));
876 for (i
= 0; i
< maybe
->num_sections
; i
++)
877 (pst
->section_offsets
)->offsets
[i
] = maybe
->sections
[i
];
881 /* We were unable to find any offsets for this file. Complain. */
882 if (dbx
->stab_section_info
) /* If there *is* any info, */
883 complaint (&symfile_complaints
,
884 _("elf/stab section information missing for %s"), filename
);
887 /* Register that we are able to handle ELF object file formats. */
889 static struct sym_fns elf_sym_fns
=
891 bfd_target_elf_flavour
,
892 elf_new_init
, /* sym_new_init: init anything gbl to entire symtab */
893 elf_symfile_init
, /* sym_init: read initial info, setup for sym_read() */
894 elf_symfile_read
, /* sym_read: read a symbol file into symtab */
895 elf_symfile_finish
, /* sym_finish: finished with file, cleanup */
896 default_symfile_offsets
, /* sym_offsets: Translate ext. to int. relocation */
897 elf_symfile_segments
, /* sym_segments: Get segment information from
899 NULL
, /* sym_read_linetable */
900 NULL
/* next: pointer to next struct sym_fns */
904 _initialize_elfread (void)
906 add_symtab_fns (&elf_sym_fns
);