1 /* Generic symbol-table support for the BFD library.
2 Copyright (C) 1990-2019 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
26 BFD tries to maintain as much symbol information as it can when
27 it moves information from file to file. BFD passes information
28 to applications though the <<asymbol>> structure. When the
29 application requests the symbol table, BFD reads the table in
30 the native form and translates parts of it into the internal
31 format. To maintain more than the information passed to
32 applications, some targets keep some information ``behind the
33 scenes'' in a structure only the particular back end knows
34 about. For example, the coff back end keeps the original
35 symbol table structure as well as the canonical structure when
36 a BFD is read in. On output, the coff back end can reconstruct
37 the output symbol table so that no information is lost, even
38 information unique to coff which BFD doesn't know or
39 understand. If a coff symbol table were read, but were written
40 through an a.out back end, all the coff specific information
41 would be lost. The symbol table of a BFD
42 is not necessarily read in until a canonicalize request is
43 made. Then the BFD back end fills in a table provided by the
44 application with pointers to the canonical information. To
45 output symbols, the application provides BFD with a table of
46 pointers to pointers to <<asymbol>>s. This allows applications
47 like the linker to output a symbol as it was read, since the ``behind
48 the scenes'' information will be still available.
54 @* symbol handling functions::
58 Reading Symbols, Writing Symbols, Symbols, Symbols
62 There are two stages to reading a symbol table from a BFD:
63 allocating storage, and the actual reading process. This is an
64 excerpt from an application which reads the symbol table:
66 | long storage_needed;
67 | asymbol **symbol_table;
68 | long number_of_symbols;
71 | storage_needed = bfd_get_symtab_upper_bound (abfd);
73 | if (storage_needed < 0)
76 | if (storage_needed == 0)
79 | symbol_table = xmalloc (storage_needed);
82 | bfd_canonicalize_symtab (abfd, symbol_table);
84 | if (number_of_symbols < 0)
87 | for (i = 0; i < number_of_symbols; i++)
88 | process_symbol (symbol_table[i]);
90 All storage for the symbols themselves is in an objalloc
91 connected to the BFD; it is freed when the BFD is closed.
94 Writing Symbols, Mini Symbols, Reading Symbols, Symbols
98 Writing of a symbol table is automatic when a BFD open for
99 writing is closed. The application attaches a vector of
100 pointers to pointers to symbols to the BFD being written, and
101 fills in the symbol count. The close and cleanup code reads
102 through the table provided and performs all the necessary
103 operations. The BFD output code must always be provided with an
104 ``owned'' symbol: one which has come from another BFD, or one
105 which has been created using <<bfd_make_empty_symbol>>. Here is an
106 example showing the creation of a symbol table with only one element:
108 | #include "sysdep.h"
116 | abfd = bfd_openw ("foo","a.out-sunos-big");
117 | bfd_set_format (abfd, bfd_object);
118 | new = bfd_make_empty_symbol (abfd);
119 | new->name = "dummy_symbol";
120 | new->section = bfd_make_section_old_way (abfd, ".text");
121 | new->flags = BSF_GLOBAL;
122 | new->value = 0x12345;
127 | bfd_set_symtab (abfd, ptrs, 1);
134 | 00012345 A dummy_symbol
136 Many formats cannot represent arbitrary symbol information; for
137 instance, the <<a.out>> object format does not allow an
138 arbitrary number of sections. A symbol pointing to a section
139 which is not one of <<.text>>, <<.data>> or <<.bss>> cannot
143 Mini Symbols, typedef asymbol, Writing Symbols, Symbols
147 Mini symbols provide read-only access to the symbol table.
148 They use less memory space, but require more time to access.
149 They can be useful for tools like nm or objdump, which may
150 have to handle symbol tables of extremely large executables.
152 The <<bfd_read_minisymbols>> function will read the symbols
153 into memory in an internal form. It will return a <<void *>>
154 pointer to a block of memory, a symbol count, and the size of
155 each symbol. The pointer is allocated using <<malloc>>, and
156 should be freed by the caller when it is no longer needed.
158 The function <<bfd_minisymbol_to_symbol>> will take a pointer
159 to a minisymbol, and a pointer to a structure returned by
160 <<bfd_make_empty_symbol>>, and return a <<asymbol>> structure.
161 The return value may or may not be the same as the value from
162 <<bfd_make_empty_symbol>> which was passed in.
169 typedef asymbol, symbol handling functions, Mini Symbols, Symbols
176 An <<asymbol>> has the form:
184 .typedef struct bfd_symbol
186 . {* A pointer to the BFD which owns the symbol. This information
187 . is necessary so that a back end can work out what additional
188 . information (invisible to the application writer) is carried
191 . This field is *almost* redundant, since you can use section->owner
192 . instead, except that some symbols point to the global sections
193 . bfd_{abs,com,und}_section. This could be fixed by making
194 . these globals be per-bfd (or per-target-flavor). FIXME. *}
195 . struct bfd *the_bfd; {* Use bfd_asymbol_bfd(sym) to access this field. *}
197 . {* The text of the symbol. The name is left alone, and not copied; the
198 . application may not alter it. *}
201 . {* The value of the symbol. This really should be a union of a
202 . numeric value with a pointer, since some flags indicate that
203 . a pointer to another symbol is stored here. *}
206 . {* Attributes of a symbol. *}
207 .#define BSF_NO_FLAGS 0
209 . {* The symbol has local scope; <<static>> in <<C>>. The value
210 . is the offset into the section of the data. *}
211 .#define BSF_LOCAL (1 << 0)
213 . {* The symbol has global scope; initialized data in <<C>>. The
214 . value is the offset into the section of the data. *}
215 .#define BSF_GLOBAL (1 << 1)
217 . {* The symbol has global scope and is exported. The value is
218 . the offset into the section of the data. *}
219 .#define BSF_EXPORT BSF_GLOBAL {* No real difference. *}
221 . {* A normal C symbol would be one of:
222 . <<BSF_LOCAL>>, <<BSF_UNDEFINED>> or <<BSF_GLOBAL>>. *}
224 . {* The symbol is a debugging record. The value has an arbitrary
225 . meaning, unless BSF_DEBUGGING_RELOC is also set. *}
226 .#define BSF_DEBUGGING (1 << 2)
228 . {* The symbol denotes a function entry point. Used in ELF,
229 . perhaps others someday. *}
230 .#define BSF_FUNCTION (1 << 3)
232 . {* Used by the linker. *}
233 .#define BSF_KEEP (1 << 5)
235 . {* An ELF common symbol. *}
236 .#define BSF_ELF_COMMON (1 << 6)
238 . {* A weak global symbol, overridable without warnings by
239 . a regular global symbol of the same name. *}
240 .#define BSF_WEAK (1 << 7)
242 . {* This symbol was created to point to a section, e.g. ELF's
243 . STT_SECTION symbols. *}
244 .#define BSF_SECTION_SYM (1 << 8)
246 . {* The symbol used to be a common symbol, but now it is
248 .#define BSF_OLD_COMMON (1 << 9)
250 . {* In some files the type of a symbol sometimes alters its
251 . location in an output file - ie in coff a <<ISFCN>> symbol
252 . which is also <<C_EXT>> symbol appears where it was
253 . declared and not at the end of a section. This bit is set
254 . by the target BFD part to convey this information. *}
255 .#define BSF_NOT_AT_END (1 << 10)
257 . {* Signal that the symbol is the label of constructor section. *}
258 .#define BSF_CONSTRUCTOR (1 << 11)
260 . {* Signal that the symbol is a warning symbol. The name is a
261 . warning. The name of the next symbol is the one to warn about;
262 . if a reference is made to a symbol with the same name as the next
263 . symbol, a warning is issued by the linker. *}
264 .#define BSF_WARNING (1 << 12)
266 . {* Signal that the symbol is indirect. This symbol is an indirect
267 . pointer to the symbol with the same name as the next symbol. *}
268 .#define BSF_INDIRECT (1 << 13)
270 . {* BSF_FILE marks symbols that contain a file name. This is used
271 . for ELF STT_FILE symbols. *}
272 .#define BSF_FILE (1 << 14)
274 . {* Symbol is from dynamic linking information. *}
275 .#define BSF_DYNAMIC (1 << 15)
277 . {* The symbol denotes a data object. Used in ELF, and perhaps
279 .#define BSF_OBJECT (1 << 16)
281 . {* This symbol is a debugging symbol. The value is the offset
282 . into the section of the data. BSF_DEBUGGING should be set
284 .#define BSF_DEBUGGING_RELOC (1 << 17)
286 . {* This symbol is thread local. Used in ELF. *}
287 .#define BSF_THREAD_LOCAL (1 << 18)
289 . {* This symbol represents a complex relocation expression,
290 . with the expression tree serialized in the symbol name. *}
291 .#define BSF_RELC (1 << 19)
293 . {* This symbol represents a signed complex relocation expression,
294 . with the expression tree serialized in the symbol name. *}
295 .#define BSF_SRELC (1 << 20)
297 . {* This symbol was created by bfd_get_synthetic_symtab. *}
298 .#define BSF_SYNTHETIC (1 << 21)
300 . {* This symbol is an indirect code object. Unrelated to BSF_INDIRECT.
301 . The dynamic linker will compute the value of this symbol by
302 . calling the function that it points to. BSF_FUNCTION must
303 . also be also set. *}
304 .#define BSF_GNU_INDIRECT_FUNCTION (1 << 22)
305 . {* This symbol is a globally unique data object. The dynamic linker
306 . will make sure that in the entire process there is just one symbol
307 . with this name and type in use. BSF_OBJECT must also be set. *}
308 .#define BSF_GNU_UNIQUE (1 << 23)
312 . {* A pointer to the section to which this symbol is
313 . relative. This will always be non NULL, there are special
314 . sections for undefined and absolute symbols. *}
315 . struct bfd_section *section;
317 . {* Back end special data. *}
332 #include "safe-ctype.h"
334 #include "aout/stab_gnu.h"
339 symbol handling functions, , typedef asymbol, Symbols
341 Symbol handling functions
346 bfd_get_symtab_upper_bound
349 Return the number of bytes required to store a vector of pointers
350 to <<asymbols>> for all the symbols in the BFD @var{abfd},
351 including a terminal NULL pointer. If there are no symbols in
352 the BFD, then return 0. If an error occurs, return -1.
354 .#define bfd_get_symtab_upper_bound(abfd) \
355 . BFD_SEND (abfd, _bfd_get_symtab_upper_bound, (abfd))
364 bfd_boolean bfd_is_local_label (bfd *abfd, asymbol *sym);
367 Return TRUE if the given symbol @var{sym} in the BFD @var{abfd} is
368 a compiler generated local label, else return FALSE.
372 bfd_is_local_label (bfd *abfd, asymbol *sym)
374 /* The BSF_SECTION_SYM check is needed for IA-64, where every label that
375 starts with '.' is local. This would accidentally catch section names
376 if we didn't reject them here. */
377 if ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_FILE | BSF_SECTION_SYM)) != 0)
379 if (sym->name == NULL)
381 return bfd_is_local_label_name (abfd, sym->name);
386 bfd_is_local_label_name
389 bfd_boolean bfd_is_local_label_name (bfd *abfd, const char *name);
392 Return TRUE if a symbol with the name @var{name} in the BFD
393 @var{abfd} is a compiler generated local label, else return
394 FALSE. This just checks whether the name has the form of a
397 .#define bfd_is_local_label_name(abfd, name) \
398 . BFD_SEND (abfd, _bfd_is_local_label_name, (abfd, name))
404 bfd_is_target_special_symbol
407 bfd_boolean bfd_is_target_special_symbol (bfd *abfd, asymbol *sym);
410 Return TRUE iff a symbol @var{sym} in the BFD @var{abfd} is something
411 special to the particular target represented by the BFD. Such symbols
412 should normally not be mentioned to the user.
414 .#define bfd_is_target_special_symbol(abfd, sym) \
415 . BFD_SEND (abfd, _bfd_is_target_special_symbol, (abfd, sym))
421 bfd_canonicalize_symtab
424 Read the symbols from the BFD @var{abfd}, and fills in
425 the vector @var{location} with pointers to the symbols and
427 Return the actual number of symbol pointers, not
430 .#define bfd_canonicalize_symtab(abfd, location) \
431 . BFD_SEND (abfd, _bfd_canonicalize_symtab, (abfd, location))
440 bfd_boolean bfd_set_symtab
441 (bfd *abfd, asymbol **location, unsigned int count);
444 Arrange that when the output BFD @var{abfd} is closed,
445 the table @var{location} of @var{count} pointers to symbols
450 bfd_set_symtab (bfd *abfd, asymbol **location, unsigned int symcount)
452 if (abfd->format != bfd_object || bfd_read_p (abfd))
454 bfd_set_error (bfd_error_invalid_operation);
458 bfd_get_outsymbols (abfd) = location;
459 bfd_get_symcount (abfd) = symcount;
465 bfd_print_symbol_vandf
468 void bfd_print_symbol_vandf (bfd *abfd, void *file, asymbol *symbol);
471 Print the value and flags of the @var{symbol} supplied to the
475 bfd_print_symbol_vandf (bfd *abfd, void *arg, asymbol *symbol)
477 FILE *file = (FILE *) arg;
479 flagword type = symbol->flags;
481 if (symbol->section != NULL)
482 bfd_fprintf_vma (abfd, file, symbol->value + symbol->section->vma);
484 bfd_fprintf_vma (abfd, file, symbol->value);
486 /* This presumes that a symbol can not be both BSF_DEBUGGING and
487 BSF_DYNAMIC, nor more than one of BSF_FUNCTION, BSF_FILE, and
489 fprintf (file, " %c%c%c%c%c%c%c",
491 ? (type & BSF_GLOBAL) ? '!' : 'l'
492 : (type & BSF_GLOBAL) ? 'g'
493 : (type & BSF_GNU_UNIQUE) ? 'u' : ' '),
494 (type & BSF_WEAK) ? 'w' : ' ',
495 (type & BSF_CONSTRUCTOR) ? 'C' : ' ',
496 (type & BSF_WARNING) ? 'W' : ' ',
497 (type & BSF_INDIRECT) ? 'I' : (type & BSF_GNU_INDIRECT_FUNCTION) ? 'i' : ' ',
498 (type & BSF_DEBUGGING) ? 'd' : (type & BSF_DYNAMIC) ? 'D' : ' ',
499 ((type & BSF_FUNCTION)
503 : ((type & BSF_OBJECT) ? 'O' : ' '))));
508 bfd_make_empty_symbol
511 Create a new <<asymbol>> structure for the BFD @var{abfd}
512 and return a pointer to it.
514 This routine is necessary because each back end has private
515 information surrounding the <<asymbol>>. Building your own
516 <<asymbol>> and pointing to it will not create the private
517 information, and will cause problems later on.
519 .#define bfd_make_empty_symbol(abfd) \
520 . BFD_SEND (abfd, _bfd_make_empty_symbol, (abfd))
526 _bfd_generic_make_empty_symbol
529 asymbol *_bfd_generic_make_empty_symbol (bfd *);
532 Create a new <<asymbol>> structure for the BFD @var{abfd}
533 and return a pointer to it. Used by core file routines,
534 binary back-end and anywhere else where no private info
539 _bfd_generic_make_empty_symbol (bfd *abfd)
541 bfd_size_type amt = sizeof (asymbol);
542 asymbol *new_symbol = (asymbol *) bfd_zalloc (abfd, amt);
544 new_symbol->the_bfd = abfd;
550 bfd_make_debug_symbol
553 Create a new <<asymbol>> structure for the BFD @var{abfd},
554 to be used as a debugging symbol. Further details of its use have
555 yet to be worked out.
557 .#define bfd_make_debug_symbol(abfd,ptr,size) \
558 . BFD_SEND (abfd, _bfd_make_debug_symbol, (abfd, ptr, size))
562 struct section_to_type
568 /* Map section names to POSIX/BSD single-character symbol types.
569 This table is probably incomplete. It is sorted for convenience of
570 adding entries. Since it is so short, a linear search is used. */
571 static const struct section_to_type stt[] =
574 {"code", 't'}, /* MRI .text */
577 {".debug", 'N'}, /* MSVC's .debug (non-standard debug syms) */
578 {".drectve", 'i'}, /* MSVC's .drective section */
579 {".edata", 'e'}, /* MSVC's .edata (export) section */
580 {".fini", 't'}, /* ELF fini section */
581 {".idata", 'i'}, /* MSVC's .idata (import) section */
582 {".init", 't'}, /* ELF init section */
583 {".pdata", 'p'}, /* MSVC's .pdata (stack unwind) section */
584 {".rdata", 'r'}, /* Read only data. */
585 {".rodata", 'r'}, /* Read only data. */
586 {".sbss", 's'}, /* Small BSS (uninitialized data). */
587 {".scommon", 'c'}, /* Small common. */
588 {".sdata", 'g'}, /* Small initialized data. */
590 {"vars", 'd'}, /* MRI .data */
591 {"zerovars", 'b'}, /* MRI .bss */
595 /* Return the single-character symbol type corresponding to
596 section S, or '?' for an unknown COFF section.
598 Check for leading strings which match, followed by a number, '.',
599 or '$' so .text5 matches the .text entry, but .init_array doesn't
600 match the .init entry. */
603 coff_section_type (const char *s)
605 const struct section_to_type *t;
607 for (t = &stt[0]; t->section; t++)
609 size_t len = strlen (t->section);
610 if (strncmp (s, t->section, len) == 0
611 && memchr (".$0123456789", s[len], 13) != 0)
618 /* Return the single-character symbol type corresponding to section
619 SECTION, or '?' for an unknown section. This uses section flags to
622 FIXME These types are unhandled: c, i, e, p. If we handled these also,
623 we could perhaps obsolete coff_section_type. */
626 decode_section_type (const struct bfd_section *section)
628 if (section->flags & SEC_CODE)
630 if (section->flags & SEC_DATA)
632 if (section->flags & SEC_READONLY)
634 else if (section->flags & SEC_SMALL_DATA)
639 if ((section->flags & SEC_HAS_CONTENTS) == 0)
641 if (section->flags & SEC_SMALL_DATA)
646 if (section->flags & SEC_DEBUGGING)
648 if ((section->flags & SEC_HAS_CONTENTS) && (section->flags & SEC_READONLY))
659 Return a character corresponding to the symbol
660 class of @var{symbol}, or '?' for an unknown class.
663 int bfd_decode_symclass (asymbol *symbol);
666 bfd_decode_symclass (asymbol *symbol)
670 if (symbol->section && bfd_is_com_section (symbol->section))
672 if (bfd_is_und_section (symbol->section))
674 if (symbol->flags & BSF_WEAK)
676 /* If weak, determine if it's specifically an object
677 or non-object weak. */
678 if (symbol->flags & BSF_OBJECT)
686 if (bfd_is_ind_section (symbol->section))
688 if (symbol->flags & BSF_GNU_INDIRECT_FUNCTION)
690 if (symbol->flags & BSF_WEAK)
692 /* If weak, determine if it's specifically an object
693 or non-object weak. */
694 if (symbol->flags & BSF_OBJECT)
699 if (symbol->flags & BSF_GNU_UNIQUE)
701 if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL)))
704 if (bfd_is_abs_section (symbol->section))
706 else if (symbol->section)
708 c = decode_section_type (symbol->section);
710 c = coff_section_type (symbol->section->name);
714 if (symbol->flags & BSF_GLOBAL)
718 /* We don't have to handle these cases just yet, but we will soon:
730 bfd_is_undefined_symclass
733 Returns non-zero if the class symbol returned by
734 bfd_decode_symclass represents an undefined symbol.
735 Returns zero otherwise.
738 bfd_boolean bfd_is_undefined_symclass (int symclass);
742 bfd_is_undefined_symclass (int symclass)
744 return symclass == 'U' || symclass == 'w' || symclass == 'v';
752 Fill in the basic info about symbol that nm needs.
753 Additional info may be added by the back-ends after
754 calling this function.
757 void bfd_symbol_info (asymbol *symbol, symbol_info *ret);
761 bfd_symbol_info (asymbol *symbol, symbol_info *ret)
763 ret->type = bfd_decode_symclass (symbol);
765 if (bfd_is_undefined_symclass (ret->type))
768 ret->value = symbol->value + symbol->section->vma;
770 ret->name = symbol->name;
775 bfd_copy_private_symbol_data
778 bfd_boolean bfd_copy_private_symbol_data
779 (bfd *ibfd, asymbol *isym, bfd *obfd, asymbol *osym);
782 Copy private symbol information from @var{isym} in the BFD
783 @var{ibfd} to the symbol @var{osym} in the BFD @var{obfd}.
784 Return <<TRUE>> on success, <<FALSE>> on error. Possible error
787 o <<bfd_error_no_memory>> -
788 Not enough memory exists to create private data for @var{osec}.
790 .#define bfd_copy_private_symbol_data(ibfd, isymbol, obfd, osymbol) \
791 . BFD_SEND (obfd, _bfd_copy_private_symbol_data, \
792 . (ibfd, isymbol, obfd, osymbol))
796 /* The generic version of the function which returns mini symbols.
797 This is used when the backend does not provide a more efficient
798 version. It just uses BFD asymbol structures as mini symbols. */
801 _bfd_generic_read_minisymbols (bfd *abfd,
807 asymbol **syms = NULL;
811 storage = bfd_get_dynamic_symtab_upper_bound (abfd);
813 storage = bfd_get_symtab_upper_bound (abfd);
819 syms = (asymbol **) bfd_malloc (storage);
824 symcount = bfd_canonicalize_dynamic_symtab (abfd, syms);
826 symcount = bfd_canonicalize_symtab (abfd, syms);
831 /* We return 0 above when storage is 0. Exit in the same state
832 here, so as to not complicate callers with having to deal with
833 freeing memory for zero symcount. */
838 *sizep = sizeof (asymbol *);
843 bfd_set_error (bfd_error_no_symbols);
849 /* The generic version of the function which converts a minisymbol to
850 an asymbol. We don't worry about the sym argument we are passed;
851 we just return the asymbol the minisymbol points to. */
854 _bfd_generic_minisymbol_to_symbol (bfd *abfd ATTRIBUTE_UNUSED,
855 bfd_boolean dynamic ATTRIBUTE_UNUSED,
857 asymbol *sym ATTRIBUTE_UNUSED)
859 return *(asymbol **) minisym;
862 /* Look through stabs debugging information in .stab and .stabstr
863 sections to find the source file and line closest to a desired
864 location. This is used by COFF and ELF targets. It sets *pfound
865 to TRUE if it finds some information. The *pinfo field is used to
866 pass cached information in and out of this routine; this first time
867 the routine is called for a BFD, *pinfo should be NULL. The value
868 placed in *pinfo should be saved with the BFD, and passed back each
869 time this function is called. */
871 /* We use a cache by default. */
873 #define ENABLE_CACHING
875 /* We keep an array of indexentry structures to record where in the
876 stabs section we should look to find line number information for a
877 particular address. */
884 char *directory_name;
889 /* Compare two indexentry structures. This is called via qsort. */
892 cmpindexentry (const void *a, const void *b)
894 const struct indexentry *contestantA = (const struct indexentry *) a;
895 const struct indexentry *contestantB = (const struct indexentry *) b;
897 if (contestantA->val < contestantB->val)
899 else if (contestantA->val > contestantB->val)
905 /* A pointer to this structure is stored in *pinfo. */
907 struct stab_find_info
909 /* The .stab section. */
911 /* The .stabstr section. */
913 /* The contents of the .stab section. */
915 /* The contents of the .stabstr section. */
918 /* A table that indexes stabs by memory address. */
919 struct indexentry *indextable;
920 /* The number of entries in indextable. */
923 #ifdef ENABLE_CACHING
924 /* Cached values to restart quickly. */
925 struct indexentry *cached_indexentry;
926 bfd_vma cached_offset;
927 bfd_byte *cached_stab;
928 char *cached_file_name;
931 /* Saved ptr to malloc'ed filename. */
936 _bfd_stab_section_find_nearest_line (bfd *abfd,
941 const char **pfilename,
942 const char **pfnname,
946 struct stab_find_info *info;
947 bfd_size_type stabsize, strsize;
948 bfd_byte *stab, *str;
949 bfd_byte *nul_fun, *nul_str;
950 bfd_size_type stroff;
951 struct indexentry *indexentry;
953 char *directory_name;
954 bfd_boolean saw_line, saw_func;
957 *pfilename = bfd_get_filename (abfd);
961 /* Stabs entries use a 12 byte format:
962 4 byte string table index
964 1 byte stab other field
965 2 byte stab desc field
967 FIXME: This will have to change for a 64 bit object format.
969 The stabs symbols are divided into compilation units. For the
970 first entry in each unit, the type of 0, the value is the length
971 of the string table for this unit, and the desc field is the
972 number of stabs symbols for this unit. */
979 #define STABSIZE (12)
981 info = (struct stab_find_info *) *pinfo;
984 if (info->stabsec == NULL || info->strsec == NULL)
986 /* No stabs debugging information. */
990 stabsize = (info->stabsec->rawsize
991 ? info->stabsec->rawsize
992 : info->stabsec->size);
993 strsize = (info->strsec->rawsize
994 ? info->strsec->rawsize
995 : info->strsec->size);
999 long reloc_size, reloc_count;
1000 arelent **reloc_vector;
1002 char *function_name;
1003 bfd_size_type amt = sizeof *info;
1005 info = (struct stab_find_info *) bfd_zalloc (abfd, amt);
1009 /* FIXME: When using the linker --split-by-file or
1010 --split-by-reloc options, it is possible for the .stab and
1011 .stabstr sections to be split. We should handle that. */
1013 info->stabsec = bfd_get_section_by_name (abfd, ".stab");
1014 info->strsec = bfd_get_section_by_name (abfd, ".stabstr");
1016 if (info->stabsec == NULL || info->strsec == NULL)
1018 /* Try SOM section names. */
1019 info->stabsec = bfd_get_section_by_name (abfd, "$GDB_SYMBOLS$");
1020 info->strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$");
1022 if (info->stabsec == NULL || info->strsec == NULL)
1024 /* No stabs debugging information. Set *pinfo so that we
1025 can return quickly in the info != NULL case above. */
1031 stabsize = (info->stabsec->rawsize
1032 ? info->stabsec->rawsize
1033 : info->stabsec->size);
1034 stabsize = (stabsize / STABSIZE) * STABSIZE;
1035 strsize = (info->strsec->rawsize
1036 ? info->strsec->rawsize
1037 : info->strsec->size);
1039 info->stabs = (bfd_byte *) bfd_alloc (abfd, stabsize);
1040 info->strs = (bfd_byte *) bfd_alloc (abfd, strsize);
1041 if (info->stabs == NULL || info->strs == NULL)
1044 if (! bfd_get_section_contents (abfd, info->stabsec, info->stabs,
1046 || ! bfd_get_section_contents (abfd, info->strsec, info->strs,
1050 /* Stab strings ought to be nul terminated. Ensure the last one
1051 is, to prevent running off the end of the buffer. */
1052 info->strs[strsize - 1] = 0;
1054 /* If this is a relocatable object file, we have to relocate
1055 the entries in .stab. This should always be simple 32 bit
1056 relocations against symbols defined in this object file, so
1057 this should be no big deal. */
1058 reloc_size = bfd_get_reloc_upper_bound (abfd, info->stabsec);
1061 reloc_vector = (arelent **) bfd_malloc (reloc_size);
1062 if (reloc_vector == NULL && reloc_size != 0)
1064 reloc_count = bfd_canonicalize_reloc (abfd, info->stabsec, reloc_vector,
1066 if (reloc_count < 0)
1068 if (reloc_vector != NULL)
1069 free (reloc_vector);
1072 if (reloc_count > 0)
1076 for (pr = reloc_vector; *pr != NULL; pr++)
1083 /* Ignore R_*_NONE relocs. */
1084 if (r->howto->dst_mask == 0)
1087 if (r->howto->rightshift != 0
1088 || r->howto->size != 2
1089 || r->howto->bitsize != 32
1090 || r->howto->pc_relative
1091 || r->howto->bitpos != 0
1092 || r->howto->dst_mask != 0xffffffff
1093 || r->address * bfd_octets_per_byte (abfd) + 4 > stabsize)
1096 (_("unsupported .stab relocation"));
1097 bfd_set_error (bfd_error_invalid_operation);
1098 if (reloc_vector != NULL)
1099 free (reloc_vector);
1103 val = bfd_get_32 (abfd, info->stabs
1104 + r->address * bfd_octets_per_byte (abfd));
1105 val &= r->howto->src_mask;
1106 sym = *r->sym_ptr_ptr;
1107 val += sym->value + sym->section->vma + r->addend;
1108 bfd_put_32 (abfd, (bfd_vma) val, info->stabs
1109 + r->address * bfd_octets_per_byte (abfd));
1113 if (reloc_vector != NULL)
1114 free (reloc_vector);
1116 /* First time through this function, build a table matching
1117 function VM addresses to stabs, then sort based on starting
1118 VM address. Do this in two passes: once to count how many
1119 table entries we'll need, and a second to actually build the
1122 info->indextablesize = 0;
1124 for (stab = info->stabs; stab < info->stabs + stabsize; stab += STABSIZE)
1126 if (stab[TYPEOFF] == (bfd_byte) N_SO)
1128 /* if we did not see a function def, leave space for one. */
1129 if (nul_fun != NULL)
1130 ++info->indextablesize;
1132 /* N_SO with null name indicates EOF */
1133 if (bfd_get_32 (abfd, stab + STRDXOFF) == 0)
1139 /* two N_SO's in a row is a filename and directory. Skip */
1140 if (stab + STABSIZE + TYPEOFF < info->stabs + stabsize
1141 && *(stab + STABSIZE + TYPEOFF) == (bfd_byte) N_SO)
1145 else if (stab[TYPEOFF] == (bfd_byte) N_FUN
1146 && bfd_get_32 (abfd, stab + STRDXOFF) != 0)
1149 ++info->indextablesize;
1153 if (nul_fun != NULL)
1154 ++info->indextablesize;
1156 if (info->indextablesize == 0)
1158 ++info->indextablesize;
1160 amt = info->indextablesize;
1161 amt *= sizeof (struct indexentry);
1162 info->indextable = (struct indexentry *) bfd_alloc (abfd, amt);
1163 if (info->indextable == NULL)
1167 directory_name = NULL;
1171 for (i = 0, stab = info->stabs, nul_str = str = info->strs;
1172 i < info->indextablesize && stab < info->stabs + stabsize;
1175 switch (stab[TYPEOFF])
1178 /* This is the first entry in a compilation unit. */
1179 if ((bfd_size_type) ((info->strs + strsize) - str) < stroff)
1182 stroff = bfd_get_32 (abfd, stab + VALOFF);
1186 /* The main file name. */
1188 /* The following code creates a new indextable entry with
1189 a NULL function name if there were no N_FUNs in a file.
1190 Note that a N_SO without a file name is an EOF and
1191 there could be 2 N_SO following it with the new filename
1193 if (nul_fun != NULL)
1195 info->indextable[i].val = bfd_get_32 (abfd, nul_fun + VALOFF);
1196 info->indextable[i].stab = nul_fun;
1197 info->indextable[i].str = nul_str;
1198 info->indextable[i].directory_name = directory_name;
1199 info->indextable[i].file_name = file_name;
1200 info->indextable[i].function_name = NULL;
1204 directory_name = NULL;
1205 file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
1206 if (file_name == (char *) str)
1215 if (file_name >= (char *) info->strs + strsize
1216 || file_name < (char *) str)
1218 if (stab + STABSIZE + TYPEOFF < info->stabs + stabsize
1219 && *(stab + STABSIZE + TYPEOFF) == (bfd_byte) N_SO)
1221 /* Two consecutive N_SOs are a directory and a
1224 directory_name = file_name;
1225 file_name = ((char *) str
1226 + bfd_get_32 (abfd, stab + STRDXOFF));
1227 if (file_name >= (char *) info->strs + strsize
1228 || file_name < (char *) str)
1235 /* The name of an include file. */
1236 file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
1237 /* PR 17512: file: 0c680a1f. */
1238 /* PR 17512: file: 5da8aec4. */
1239 if (file_name >= (char *) info->strs + strsize
1240 || file_name < (char *) str)
1245 /* A function name. */
1246 function_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
1247 if (function_name == (char *) str)
1249 if (function_name >= (char *) info->strs + strsize
1250 || function_name < (char *) str)
1251 function_name = NULL;
1254 info->indextable[i].val = bfd_get_32 (abfd, stab + VALOFF);
1255 info->indextable[i].stab = stab;
1256 info->indextable[i].str = str;
1257 info->indextable[i].directory_name = directory_name;
1258 info->indextable[i].file_name = file_name;
1259 info->indextable[i].function_name = function_name;
1265 if (nul_fun != NULL)
1267 info->indextable[i].val = bfd_get_32 (abfd, nul_fun + VALOFF);
1268 info->indextable[i].stab = nul_fun;
1269 info->indextable[i].str = nul_str;
1270 info->indextable[i].directory_name = directory_name;
1271 info->indextable[i].file_name = file_name;
1272 info->indextable[i].function_name = NULL;
1276 info->indextable[i].val = (bfd_vma) -1;
1277 info->indextable[i].stab = info->stabs + stabsize;
1278 info->indextable[i].str = str;
1279 info->indextable[i].directory_name = NULL;
1280 info->indextable[i].file_name = NULL;
1281 info->indextable[i].function_name = NULL;
1284 info->indextablesize = i;
1285 qsort (info->indextable, (size_t) i, sizeof (struct indexentry),
1291 /* We are passed a section relative offset. The offsets in the
1292 stabs information are absolute. */
1293 offset += bfd_get_section_vma (abfd, section);
1295 #ifdef ENABLE_CACHING
1296 if (info->cached_indexentry != NULL
1297 && offset >= info->cached_offset
1298 && offset < (info->cached_indexentry + 1)->val)
1300 stab = info->cached_stab;
1301 indexentry = info->cached_indexentry;
1302 file_name = info->cached_file_name;
1310 /* Cache non-existent or invalid. Do binary search on
1315 high = info->indextablesize - 1;
1318 mid = (high + low) / 2;
1319 if (offset >= info->indextable[mid].val
1320 && offset < info->indextable[mid + 1].val)
1322 indexentry = &info->indextable[mid];
1326 if (info->indextable[mid].val > offset)
1332 if (indexentry == NULL)
1335 stab = indexentry->stab + STABSIZE;
1336 file_name = indexentry->file_name;
1339 directory_name = indexentry->directory_name;
1340 str = indexentry->str;
1344 for (; stab < (indexentry+1)->stab; stab += STABSIZE)
1351 switch (stab[TYPEOFF])
1354 /* The name of an include file. */
1355 val = bfd_get_32 (abfd, stab + VALOFF);
1358 file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
1359 if (file_name >= (char *) info->strs + strsize
1360 || file_name < (char *) str)
1369 /* A line number. If the function was specified, then the value
1370 is relative to the start of the function. Otherwise, the
1371 value is an absolute address. */
1372 val = ((indexentry->function_name ? indexentry->val : 0)
1373 + bfd_get_32 (abfd, stab + VALOFF));
1374 /* If this line starts before our desired offset, or if it's
1375 the first line we've been able to find, use it. The
1376 !saw_line check works around a bug in GCC 2.95.3, which emits
1377 the first N_SLINE late. */
1378 if (!saw_line || val <= offset)
1380 *pline = bfd_get_16 (abfd, stab + DESCOFF);
1382 #ifdef ENABLE_CACHING
1383 info->cached_stab = stab;
1384 info->cached_offset = val;
1385 info->cached_file_name = file_name;
1386 info->cached_indexentry = indexentry;
1396 if (saw_func || saw_line)
1408 if (file_name == NULL || IS_ABSOLUTE_PATH (file_name)
1409 || directory_name == NULL)
1410 *pfilename = file_name;
1415 dirlen = strlen (directory_name);
1416 if (info->filename == NULL
1417 || filename_ncmp (info->filename, directory_name, dirlen) != 0
1418 || filename_cmp (info->filename + dirlen, file_name) != 0)
1422 /* Don't free info->filename here. objdump and other
1423 apps keep a copy of a previously returned file name
1425 len = strlen (file_name) + 1;
1426 info->filename = (char *) bfd_alloc (abfd, dirlen + len);
1427 if (info->filename == NULL)
1429 memcpy (info->filename, directory_name, dirlen);
1430 memcpy (info->filename + dirlen, file_name, len);
1433 *pfilename = info->filename;
1436 if (indexentry->function_name != NULL)
1440 /* This will typically be something like main:F(0,1), so we want
1441 to clobber the colon. It's OK to change the name, since the
1442 string is in our own local storage anyhow. */
1443 s = strchr (indexentry->function_name, ':');
1447 *pfnname = indexentry->function_name;
1454 _bfd_nosymbols_canonicalize_symtab (bfd *abfd ATTRIBUTE_UNUSED,
1455 asymbol **location ATTRIBUTE_UNUSED)
1461 _bfd_nosymbols_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,
1462 void *afile ATTRIBUTE_UNUSED,
1463 asymbol *symbol ATTRIBUTE_UNUSED,
1464 bfd_print_symbol_type how ATTRIBUTE_UNUSED)
1469 _bfd_nosymbols_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
1470 asymbol *sym ATTRIBUTE_UNUSED,
1471 symbol_info *ret ATTRIBUTE_UNUSED)
1476 _bfd_nosymbols_get_symbol_version_string (bfd *abfd,
1477 asymbol *symbol ATTRIBUTE_UNUSED,
1478 bfd_boolean *hidden ATTRIBUTE_UNUSED)
1480 return (const char *) _bfd_ptr_bfd_null_error (abfd);
1484 _bfd_nosymbols_bfd_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED,
1485 const char *name ATTRIBUTE_UNUSED)
1491 _bfd_nosymbols_get_lineno (bfd *abfd, asymbol *sym ATTRIBUTE_UNUSED)
1493 return (alent *) _bfd_ptr_bfd_null_error (abfd);
1497 _bfd_nosymbols_find_nearest_line
1499 asymbol **symbols ATTRIBUTE_UNUSED,
1500 asection *section ATTRIBUTE_UNUSED,
1501 bfd_vma offset ATTRIBUTE_UNUSED,
1502 const char **filename_ptr ATTRIBUTE_UNUSED,
1503 const char **functionname_ptr ATTRIBUTE_UNUSED,
1504 unsigned int *line_ptr ATTRIBUTE_UNUSED,
1505 unsigned int *discriminator_ptr ATTRIBUTE_UNUSED)
1507 return _bfd_bool_bfd_false_error (abfd);
1511 _bfd_nosymbols_find_line (bfd *abfd,
1512 asymbol **symbols ATTRIBUTE_UNUSED,
1513 asymbol *symbol ATTRIBUTE_UNUSED,
1514 const char **filename_ptr ATTRIBUTE_UNUSED,
1515 unsigned int *line_ptr ATTRIBUTE_UNUSED)
1517 return _bfd_bool_bfd_false_error (abfd);
1521 _bfd_nosymbols_find_inliner_info
1523 const char **filename_ptr ATTRIBUTE_UNUSED,
1524 const char **functionname_ptr ATTRIBUTE_UNUSED,
1525 unsigned int *line_ptr ATTRIBUTE_UNUSED)
1527 return _bfd_bool_bfd_false_error (abfd);
1531 _bfd_nosymbols_bfd_make_debug_symbol (bfd *abfd,
1532 void *ptr ATTRIBUTE_UNUSED,
1533 unsigned long sz ATTRIBUTE_UNUSED)
1535 return (asymbol *) _bfd_ptr_bfd_null_error (abfd);
1539 _bfd_nosymbols_read_minisymbols (bfd *abfd,
1540 bfd_boolean dynamic ATTRIBUTE_UNUSED,
1541 void **minisymsp ATTRIBUTE_UNUSED,
1542 unsigned int *sizep ATTRIBUTE_UNUSED)
1544 return _bfd_long_bfd_n1_error (abfd);
1548 _bfd_nosymbols_minisymbol_to_symbol (bfd *abfd,
1549 bfd_boolean dynamic ATTRIBUTE_UNUSED,
1550 const void *minisym ATTRIBUTE_UNUSED,
1551 asymbol *sym ATTRIBUTE_UNUSED)
1553 return (asymbol *) _bfd_ptr_bfd_null_error (abfd);
1557 _bfd_nodynamic_get_synthetic_symtab (bfd *abfd,
1558 long symcount ATTRIBUTE_UNUSED,
1559 asymbol **syms ATTRIBUTE_UNUSED,
1560 long dynsymcount ATTRIBUTE_UNUSED,
1561 asymbol **dynsyms ATTRIBUTE_UNUSED,
1562 asymbol **ret ATTRIBUTE_UNUSED)
1564 return _bfd_long_bfd_n1_error (abfd);