1 /* Generic BFD library interface and support routines.
2 Copyright (C) 1990-1991 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 @section @code{typedef bfd}
26 A BFD is has type @code{bfd}; objects of this type are the cornerstone
27 of any application using @code{libbfd}. References though the BFD and
28 to data in the BFD give the entire BFD functionality.
30 Here is the struct used to define the type @code{bfd}. This contains
31 the major data about the file, and contains pointers to the rest of
38 The filename the application opened the BFD with.
40 $ CONST char *filename;
42 A pointer to the target jump table.
44 $ struct bfd_target *xvec;
47 To avoid dragging too many header files into every file that
48 includes @file{bfd.h}, IOSTREAM has been declared as a "char *", and MTIME
49 as a "long". Their correct types, to which they are cast when used,
50 are "FILE *" and "time_t".
52 The iostream is the result of an fopen on the filename.
56 Is the file being cached @xref{File Caching}.
60 Marks whether there was a default target specified when the BFD was
61 opened. This is used to select what matching algorithm to use to chose
64 $ boolean target_defaulted;
66 The caching routines use these to maintain a least-recently-used list of
67 BFDs (@pxref{File Caching}).
69 $ struct _bfd *lru_prev, *lru_next;
71 When a file is closed by the caching routines, BFD retains state
72 information on the file here:
78 $ boolean opened_once;
85 Reserved for an unimplemented file locking extension.
89 The format which belongs to the BFD.
93 The direction the BFD was opened with
95 $ enum bfd_direction {no_direction = 0,
97 $ write_direction = 2,
98 $ both_direction = 3} direction;
100 Format_specific flags
104 Currently my_archive is tested before adding origin to anything. I
105 believe that this can become always an add of origin, with origin set
106 to 0 for non archive files.
110 Remember when output has begun, to stop strange things happening.
112 $ boolean output_has_begun;
114 Pointer to linked list of sections
116 $ struct sec *sections;
118 The number of sections
120 $ unsigned int section_count;
122 Stuff only useful for object files:
125 $ bfd_vma start_address;
126 Used for input and output
128 $ unsigned int symcount;
129 Symbol table for output BFD
131 $ struct symbol_cache_entry **outsymbols;
133 Pointer to structure which contains architecture information
135 $ struct bfd_arch_info *arch_info;
137 Stuff only useful for archives:
140 $ struct _bfd *my_archive;
142 $ struct _bfd *archive_head;
145 Used by the back end to hold private data.
149 Used by the application to hold private data
153 Where all the allocated stuff under this BFD goes (@pxref{Memory Usage}).
155 $ struct obstack memory;
166 extern char *strerror();
169 CONST
short _bfd_host_big_endian
= 0x0100;
170 /* Accessing the above as (*(char*)&_bfd_host_big_endian), will
171 return 1 if the host is big-endian, 0 otherwise.
172 (assuming that a short is two bytes long!!! FIXME)
173 (See HOST_IS_BIG_ENDIAN_P in bfd.h.) */
176 o - Most functions return nonzero on success (check doc for
177 precise semantics); 0 or NULL on error.
178 o - Internal errors are documented by the value of bfd_error.
179 If that is system_call_error then check errno.
180 o - The easiest way to report this to the user is to use bfd_perror.
183 bfd_ec bfd_error
= no_error
;
185 char *bfd_errmsgs
[] = { "No error",
188 "File in wrong format",
192 "No relocation info",
193 "No more archived files",
196 "File format not recognized",
197 "File format is ambiguous",
198 "Section has no contents",
199 "Nonrepresentable section on output",
200 "Symbol needs debug section which does not exist",
201 "#<Invalid error code>"
206 DEFUN(bfd_nonrepresentable_section
,(abfd
, name
),
207 CONST bfd
* CONST abfd AND
208 CONST
char * CONST name
)
210 printf("bfd error writing file %s, format %s can't represent section %s\n",
217 bfd_error_vector_type bfd_error_vector
=
219 bfd_nonrepresentable_section
223 bfd_errmsg (error_tag
)
229 if (error_tag
== system_call_error
)
230 return strerror (errno
);
232 if ((((int)error_tag
<(int) no_error
) ||
233 ((int)error_tag
> (int)invalid_error_code
)))
234 error_tag
= invalid_error_code
;/* sanity check */
236 return bfd_errmsgs
[(int)error_tag
];
240 void bfd_default_error_trap(error_tag
)
243 printf("bfd assert fail (%s)\n", bfd_errmsg(error_tag
));
246 void (*bfd_error_trap
)() = bfd_default_error_trap
;
247 void (*bfd_error_nonrepresentabltrap
)() = bfd_default_error_trap
;
250 DEFUN(bfd_perror
,(message
),
253 if (bfd_error
== system_call_error
)
254 perror((char *)message
); /* must be system error then... */
256 if (message
== NULL
|| *message
== '\0')
257 fprintf (stderr
, "%s\n", bfd_errmsg (bfd_error
));
259 fprintf (stderr
, "%s: %s\n", message
, bfd_errmsg (bfd_error
));
266 /* returns the number of octets of storage required */
269 get_reloc_upper_bound (abfd
, asect
)
273 if (abfd
->format
!= bfd_object
) {
274 bfd_error
= invalid_operation
;
278 return BFD_SEND (abfd
, _get_reloc_upper_bound
, (abfd
, asect
));
282 DEFUN(bfd_canonicalize_reloc
,(abfd
, asect
, location
, symbols
),
285 arelent
**location AND
288 if (abfd
->format
!= bfd_object
) {
289 bfd_error
= invalid_operation
;
292 return BFD_SEND (abfd
, _bfd_canonicalize_reloc
, (abfd
, asect
, location
, symbols
));
297 bfd_set_file_flags (abfd
, flags
)
301 if (abfd
->format
!= bfd_object
) {
302 bfd_error
= wrong_format
;
306 if (bfd_read_p (abfd
)) {
307 bfd_error
= invalid_operation
;
311 if ((flags
& bfd_applicable_file_flags (abfd
)) != flags
) {
312 bfd_error
= invalid_operation
;
316 bfd_get_file_flags (abfd
) = flags
;
322 bfd_set_reloc (ignore_abfd
, asect
, location
, count
)
328 asect
->orelocation
= location
;
329 asect
->reloc_count
= count
;
333 bfd_assert(file
, line
)
337 printf("bfd assertion fail %s:%d\n",file
,line
);
341 /*proto* bfd_set_start_address
343 Marks the entry point of an output BFD. Returns @code{true} on
344 success, @code{false} otherwise.
346 *; PROTO(boolean, bfd_set_start_address,(bfd *, bfd_vma));
350 bfd_set_start_address(abfd
, vma
)
354 abfd
->start_address
= vma
;
359 /*proto* bfd_get_mtime
361 Return cached file modification time (e.g. as read from archive header
362 for archive members, or from file system if we have been called
363 before); else determine modify time, cache it, and return it.
365 *; PROTO(long, bfd_get_mtime, (bfd *));
379 fp
= bfd_cache_lookup (abfd
);
380 if (0 != fstat (fileno (fp
), &buf
))
383 abfd
->mtime_set
= true;
384 abfd
->mtime
= buf
.st_mtime
;
392 #define bfd_sizeof_headers(abfd, reloc) \
393 BFD_SEND (abfd, _bfd_sizeof_headers, (abfd, reloc))
395 #define bfd_find_nearest_line(abfd, section, symbols, offset, filename_ptr, func, line_ptr) \
396 BFD_SEND (abfd, _bfd_find_nearest_line, (abfd, section, symbols, offset, filename_ptr, func, line_ptr))
398 #define bfd_debug_info_start(abfd) \
399 BFD_SEND (abfd, _bfd_debug_info_start, (abfd))
401 #define bfd_debug_info_end(abfd) \
402 BFD_SEND (abfd, _bfd_debug_info_end, (abfd))
404 #define bfd_debug_info_accumulate(abfd, section) \
405 BFD_SEND (abfd, _bfd_debug_info_accumulate, (abfd, section))
407 #define bfd_stat_arch_elt(abfd, stat) \
408 BFD_SEND (abfd, _bfd_stat_arch_elt,(abfd, stat))
410 #define bfd_coff_swap_aux_in(a,e,t,c,i) \
411 BFD_SEND (a, _bfd_coff_swap_aux_in, (a,e,t,c,i))
413 #define bfd_coff_swap_sym_in(a,e,i) \
414 BFD_SEND (a, _bfd_coff_swap_sym_in, (a,e,i))
416 #define bfd_coff_swap_lineno_in(a,e,i) \
417 BFD_SEND ( a, _bfd_coff_swap_lineno_in, (a,e,i))
419 #define bfd_set_arch_mach(abfd, arch, mach)\
420 BFD_SEND ( abfd, _bfd_set_arch_mach, (abfd, arch, mach))
422 #define bfd_coff_swap_reloc_out(abfd, i, o) \
423 BFD_SEND (abfd, _bfd_coff_swap_reloc_out, (abfd, i, o))
425 #define bfd_coff_swap_lineno_out(abfd, i, o) \
426 BFD_SEND (abfd, _bfd_coff_swap_lineno_out, (abfd, i, o))
428 #define bfd_coff_swap_aux_out(abfd, i, t,c,o) \
429 BFD_SEND (abfd, _bfd_coff_swap_aux_out, (abfd, i,t,c, o))
431 #define bfd_coff_swap_sym_out(abfd, i,o) \
432 BFD_SEND (abfd, _bfd_coff_swap_sym_out, (abfd, i, o))
434 #define bfd_coff_swap_scnhdr_out(abfd, i,o) \
435 BFD_SEND (abfd, _bfd_coff_swap_scnhdr_out, (abfd, i, o))
437 #define bfd_coff_swap_filehdr_out(abfd, i,o) \
438 BFD_SEND (abfd, _bfd_coff_swap_filehdr_out, (abfd, i, o))
440 #define bfd_coff_swap_aouthdr_out(abfd, i,o) \
441 BFD_SEND (abfd, _bfd_coff_swap_aouthdr_out, (abfd, i, o))