aboutsummaryrefslogtreecommitdiff
path: root/bfd/bfd.c
blob: 331312e8e9c6a85ce3a0dbd763736090f133bf7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
/* Generic BFD library interface and support routines.
   Copyright (C) 1990-1991 Free Software Foundation, Inc.
   Written by Cygnus Support.

This file is part of BFD, the Binary File Descriptor library.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* $Id$ */

/*proto*
@section @code{typedef bfd}

A BFD is has type @code{bfd}; objects of this type are the cornerstone
of any application using @code{libbfd}. References though the BFD and
to data in the BFD give the entire BFD functionality.

Here is the struct used to define the type @code{bfd}.  This contains
the major data about the file, and contains pointers to the rest of
the data.

*+++

$struct _bfd 
${
  The filename the application opened the BFD with.

$  CONST char *filename;                

A pointer to the target jump table.

$  struct bfd_target *xvec;


To avoid dragging too many header files into every file that
includes @file{bfd.h}, IOSTREAM has been declared as a "char *", and MTIME
as a "long".  Their correct types, to which they are cast when used,
are "FILE *" and "time_t".  

The iostream is the result of an fopen on the filename.

$  char *iostream;

Is the file being cached @xref{File Caching}.

$  boolean cacheable;

Marks whether there was a default target specified when the BFD was
opened. This is used to select what matching algorithm to use to chose
the back end.

$  boolean target_defaulted;

The caching routines use these to maintain a least-recently-used list of
BFDs (@pxref{File Caching}).

$  struct _bfd *lru_prev, *lru_next;

When a file is closed by the caching routines, BFD retains state
information on the file here:

$  file_ptr where;              

and here:

$  boolean opened_once;

$  boolean mtime_set;
File modified time 

$  long mtime;          

Reserved for an unimplemented file locking extension.

$int ifd;

The format which belongs to the BFD.

$  bfd_format format;

The direction the BFD was opened with

$  enum bfd_direction {no_direction = 0,
$                       read_direction = 1,
$                       write_direction = 2,
$                       both_direction = 3} direction;

Format_specific flags

$  flagword flags;              

Currently my_archive is tested before adding origin to anything. I
believe that this can become always an add of origin, with origin set
to 0 for non archive files.  

$  file_ptr origin;             

Remember when output has begun, to stop strange things happening.

$  boolean output_has_begun;

Pointer to linked list of sections

$  struct sec  *sections;

The number of sections 

$  unsigned int section_count;

Stuff only useful for object files:
The start address.

$  bfd_vma start_address;
Used for input and output

$  unsigned int symcount;
Symbol table for output BFD

$  struct symbol_cache_entry  **outsymbols;             

Architecture of object machine, eg m68k 

$  enum bfd_architecture obj_arch;

Particular machine within arch, e.g. 68010

$  unsigned long obj_machine;

Stuff only useful for archives:

$  PTR arelt_data;              
$  struct _bfd *my_archive;     
$  struct _bfd *next;           
$  struct _bfd *archive_head;   
$  boolean has_armap;           

Used by the back end to hold private data.

$  PTR tdata;

Used by the application to hold private data

$  PTR usrdata;

Where all the allocated stuff under this BFD goes (@pxref{Memory Usage}).

$  struct obstack memory;
$};

*---

*/
#include <sysdep.h>
#include "bfd.h"
#include "libbfd.h"


short _bfd_host_big_endian = 0x0100;
        /* Accessing the above as (*(char*)&_bfd_host_big_endian), will
           return 1 if the host is big-endian, 0 otherwise.
           (assuming that a short is two bytes long!!!  FIXME)
           (See HOST_IS_BIG_ENDIAN_P in bfd.h.)  */

/** Error handling
    o - Most functions return nonzero on success (check doc for
        precise semantics); 0 or NULL on error.
    o - Internal errors are documented by the value of bfd_error.
        If that is system_call_error then check errno.
    o - The easiest way to report this to the user is to use bfd_perror.
*/

bfd_ec bfd_error = no_error;

char *bfd_errmsgs[] = { "No error",
                        "System call error",
                        "Invalid target",
                        "File in wrong format",
                        "Invalid operation",
                        "Memory exhausted",
                        "No symbols",
                        "No relocation info",
                        "No more archived files",
                        "Malformed archive",
                        "Symbol not found",
                        "File format not recognized",
                        "File format is ambiguous",
                        "Section has no contents",
                        "Nonrepresentable section on output",
                        "#<Invalid error code>"
                       };

static 
void 
DEFUN(bfd_nonrepresentable_section,(abfd, name),
         CONST  bfd * CONST abfd AND
         CONST  char * CONST name)
{
  printf("bfd error writing file %s, format %s can't represent section %s\n",
         abfd->filename, 
         abfd->xvec->name,
         name);
  exit(1);
}

bfd_error_vector_type bfd_error_vector = 
  {
  bfd_nonrepresentable_section 
  };

#if  !defined(ANSI_LIBRARIES) && !defined(__STDC__) || HOST_SYS==SUN4_SYS
char *
strerror (code)
     int code;
{
  extern int sys_nerr;
  extern char *sys_errlist[];

  return (((code < 0) || (code >= sys_nerr)) ? "(unknown error)" :
          sys_errlist [code]);
}
#endif /* not ANSI_LIBRARIES */


char *
bfd_errmsg (error_tag)
     bfd_ec error_tag;
{
#ifndef errno
  extern int errno;
#endif
  if (error_tag == system_call_error)
    return strerror (errno);

  if ((((int)error_tag <(int) no_error) ||
       ((int)error_tag > (int)invalid_error_code)))
    error_tag = invalid_error_code;/* sanity check */

  return bfd_errmsgs [(int)error_tag];
}


void bfd_default_error_trap(error_tag)
bfd_ec error_tag;
{
  printf("bfd assert fail (%s)\n", bfd_errmsg(error_tag));
}

void (*bfd_error_trap)() = bfd_default_error_trap;
void (*bfd_error_nonrepresentabltrap)() = bfd_default_error_trap;

void
DEFUN(bfd_perror,(message),
      CONST char *message)
{
  if (bfd_error == system_call_error)
    perror((char *)message);            /* must be system error then... */
  else {
    if (message == NULL || *message == '\0')
      fprintf (stderr, "%s\n", bfd_errmsg (bfd_error));
    else
      fprintf (stderr, "%s: %s\n", message, bfd_errmsg (bfd_error));
  }
}

 
/** Symbols */

/* returns the number of octets of storage required */

unsigned int
get_reloc_upper_bound (abfd, asect)
     bfd *abfd;
     sec_ptr asect;
{
  if (abfd->format != bfd_object) {
    bfd_error = invalid_operation;
    return 0;
  }

  return BFD_SEND (abfd, _get_reloc_upper_bound, (abfd, asect));
}

unsigned int
bfd_canonicalize_reloc (abfd, asect, location, symbols)
     bfd *abfd;
     sec_ptr asect;
     arelent **location;
     asymbol **symbols;
{
  if (abfd->format != bfd_object) {
    bfd_error = invalid_operation;
    return 0;
  }

  return BFD_SEND (abfd, _bfd_canonicalize_reloc, (abfd, asect, location, symbols));
}


boolean
bfd_set_file_flags (abfd, flags)
     bfd *abfd;
     flagword flags;
{
  if (abfd->format != bfd_object) {
    bfd_error = wrong_format;
    return false;
  }

  if (bfd_read_p (abfd)) {
    bfd_error = invalid_operation;
    return false;
  }

  if ((flags & bfd_applicable_file_flags (abfd)) != flags) {
    bfd_error = invalid_operation;
    return false;
  }

  bfd_get_file_flags (abfd) = flags;
return true;
}


void
bfd_set_reloc (ignore_abfd, asect, location, count)
     bfd *ignore_abfd;
     sec_ptr asect;
     arelent **location;
     unsigned int count;
{
  asect->orelocation  = location;
  asect->reloc_count = count;
}

void
bfd_assert(file, line)
char *file;
int line;
{
  printf("bfd assertion fail %s:%d\n",file,line);
}


/*proto* bfd_set_start_address

Marks the entry point of an output BFD. Returns @code{true} on
success, @code{false} otherwise.

*; PROTO(boolean, bfd_set_start_address,(bfd *, bfd_vma));
*/

boolean
bfd_set_start_address(abfd, vma)
bfd *abfd;
bfd_vma vma;
{
  abfd->start_address = vma;
  return true;
}


/*proto*  bfd_get_mtime

Return cached file modification time (e.g. as read from archive header
for archive members, or from file system if we have been called
before); else determine modify time, cache it, and return it.  

*; PROTO(long, bfd_get_mtime, (bfd *));

*/

long
bfd_get_mtime (abfd)
     bfd *abfd;
{
  FILE *fp;
  struct stat buf;

  if (abfd->mtime_set)
    return abfd->mtime;

  fp = bfd_cache_lookup (abfd);
  if (0 != fstat (fileno (fp), &buf))
    return 0;

  abfd->mtime_set = true;
  abfd->mtime = buf.st_mtime;
  return abfd->mtime;
}

/*proto* stuff

*+

#define bfd_sizeof_headers(abfd, reloc) \
     BFD_SEND (abfd, _bfd_sizeof_headers, (abfd, reloc))

#define bfd_find_nearest_line(abfd, section, symbols, offset, filename_ptr, func, line_ptr) \
     BFD_SEND (abfd, _bfd_find_nearest_line,  (abfd, section, symbols, offset, filename_ptr, func, line_ptr))

#define bfd_debug_info_start(abfd) \
        BFD_SEND (abfd, _bfd_debug_info_start, (abfd))

#define bfd_debug_info_end(abfd) \
        BFD_SEND (abfd, _bfd_debug_info_end, (abfd))

#define bfd_debug_info_accumulate(abfd, section) \
        BFD_SEND (abfd, _bfd_debug_info_accumulate, (abfd, section))

#define bfd_stat_arch_elt(abfd, stat) \
        BFD_SEND (abfd, _bfd_stat_arch_elt,(abfd, stat))

#define bfd_coff_swap_aux_in(a,e,t,c,i) \
        BFD_SEND (a, _bfd_coff_swap_aux_in, (a,e,t,c,i))

#define bfd_coff_swap_sym_in(a,e,i) \
        BFD_SEND (a, _bfd_coff_swap_sym_in, (a,e,i))

#define bfd_coff_swap_lineno_in(a,e,i) \
        BFD_SEND ( a, _bfd_coff_swap_lineno_in, (a,e,i))
*-

*/