1 /* Assorted BFD support routines, only used internally.
2 Copyright 1990, 1991, 1992 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. */
30 This file contains various routines which are used within BFD.
31 They are not intended for export, but are documented here for
36 DEFUN(_bfd_dummy_new_section_hook,(ignore, ignore_newsect),
38 asection *ignore_newsect)
44 DEFUN(bfd_false ,(ignore),
51 DEFUN(bfd_true,(ignore),
58 DEFUN(bfd_nullvoidptr,(ignore),
72 DEFUN(bfd_0u,(ignore),
79 DEFUN(bfd_void,(ignore),
85 DEFUN(_bfd_dummy_core_file_matches_executable_p,(ignore_core_bfd, ignore_exec_bfd),
86 bfd *ignore_core_bfd AND
89 bfd_error = invalid_operation;
93 /* of course you can't initialize a function to be the same as another, grr */
96 DEFUN(_bfd_dummy_core_file_failing_command,(ignore_abfd),
103 DEFUN(_bfd_dummy_core_file_failing_signal,(ignore_abfd),
110 DEFUN(_bfd_dummy_target,(ignore_abfd),
116 /** zalloc -- allocate and clear storage */
124 char *ptr = (char *) malloc ((int)size);
126 if ((ptr != NULL) && (size != 0))
138 PTR bfd_xmalloc( bfd_size_type size);
141 Like malloc, but exit if no more memory.
145 /** There is major inconsistency in how running out of memory is handled.
146 Some routines return a NULL, and set bfd_error to no_memory.
147 However, obstack routines can't do this ... */
150 DEFUN(PTR bfd_xmalloc,(size),
153 static CONST char no_memory_message[] = "Virtual memory exhausted!\n";
155 if (size == 0) size = 1;
156 ptr = (PTR)malloc(size);
159 write (2, no_memory_message, sizeof(no_memory_message)-1);
168 /* Note that archive entries don't have streams; they share their parent's.
169 This allows someone to play with the iostream behind BFD's back.
171 Also, note that the origin pointer points to the beginning of a file's
172 contents (0 for non-archive elements). For archive entries this is the
173 first octet in the file, NOT the beginning of the archive header. */
176 int DEFUN(real_read,(where, a,b, file),
182 return fread(where, a,b,file);
185 DEFUN(bfd_read,(ptr, size, nitems, abfd),
187 bfd_size_type size AND
188 bfd_size_type nitems AND
192 nread = real_read (ptr, 1, (int)(size*nitems), bfd_cache_lookup(abfd));
193 #ifdef FILE_OFFSET_IS_CHAR_INDEX
195 abfd->where += nread;
201 DEFUN(bfd_write,(ptr, size, nitems, abfd),
203 bfd_size_type size AND
204 bfd_size_type nitems AND
207 int nwrote = fwrite (ptr, 1, (int)(size*nitems), bfd_cache_lookup(abfd));
208 #ifdef FILE_OFFSET_IS_CHAR_INDEX
210 abfd->where += nwrote;
217 bfd_write_bigendian_4byte_int
220 void bfd_write_bigendian_4byte_int(bfd *abfd, int i);
223 Writes a 4 byte integer to the outputing bfd, in big endian
224 mode regardless of what else is going on. This is usefull in
229 DEFUN(bfd_write_bigendian_4byte_int,(abfd, i),
234 _do_putb32(i, buffer);
235 bfd_write((PTR)buffer, 4, 1, abfd);
239 DEFUN(bfd_tell,(abfd),
244 ptr = ftell (bfd_cache_lookup(abfd));
246 if (abfd->my_archive)
253 DEFUN(bfd_seek,(abfd, position, direction),
255 CONST file_ptr position AND
260 file_ptr file_position;
261 /* For the time being, a BFD may not seek to it's end. The problem
262 is that we don't easily have a way to recognize the end of an
263 element in an archive. */
265 BFD_ASSERT (direction == SEEK_SET || direction == SEEK_CUR);
267 if (direction == SEEK_CUR && position == 0)
269 #ifdef FILE_OFFSET_IS_CHAR_INDEX
270 if (abfd->format != bfd_archive && abfd->my_archive == 0)
273 /* Explanation for this code: I'm only about 95+% sure that the above
274 conditions are sufficient and that all i/o calls are properly
275 adjusting the `where' field. So this is sort of an `assert'
276 that the `where' field is correct. If we can go a while without
277 tripping the abort, we can probably safely disable this code,
278 so that the real optimizations happen. */
279 file_ptr where_am_i_now;
280 where_am_i_now = ftell (bfd_cache_lookup (abfd));
281 if (abfd->my_archive)
282 where_am_i_now -= abfd->origin;
283 if (where_am_i_now != abfd->where)
286 if (direction == SEEK_SET && position == abfd->where)
291 /* We need something smarter to optimize access to archives.
292 Currently, anything inside an archive is read via the file
293 handle for the archive. Which means that a bfd_seek on one
294 component affects the `current position' in the archive, as
295 well as in any other component.
297 It might be sufficient to put a spike through the cache
298 abstraction, and look to the archive for the file position,
299 but I think we should try for something cleaner.
301 In the meantime, no optimization for archives. */
305 f = bfd_cache_lookup (abfd);
306 file_position = position;
307 if (direction == SEEK_SET && abfd->my_archive != NULL)
308 file_position += abfd->origin;
310 result = fseek (f, file_position, direction);
313 /* Force redetermination of `where' field. */
317 #ifdef FILE_OFFSET_IS_CHAR_INDEX
318 /* Adjust `where' field. */
319 if (direction == SEEK_SET)
320 abfd->where = position;
322 abfd->where += position;
328 /** Make a string table */
331 Add string to table pointed to by table, at location starting with free_ptr.
332 resizes the table if necessary (if it's NULL, creates it, ignoring
333 table_length). Updates free_ptr, table, table_length */
336 DEFUN(bfd_add_to_string_table,(table, new_string, table_length, free_ptr),
339 unsigned int *table_length AND
342 size_t string_length = strlen (new_string) + 1; /* include null here */
344 size_t space_length = *table_length;
345 unsigned int offset = (base ? *free_ptr - base : 0);
348 /* Avoid a useless regrow if we can (but of course we still
350 space_length = (string_length < DEFAULT_STRING_SPACE_SIZE ?
351 DEFAULT_STRING_SPACE_SIZE : string_length+1);
352 base = zalloc (space_length);
355 bfd_error = no_memory;
360 if ((size_t)(offset + string_length) >= space_length) {
361 /* Make sure we will have enough space */
362 while ((size_t)(offset + string_length) >= space_length)
363 space_length += space_length/2; /* grow by 50% */
365 base = (char *) realloc (base, space_length);
367 bfd_error = no_memory;
373 memcpy (base + offset, new_string, string_length);
375 *table_length = space_length;
376 *free_ptr = base + offset + string_length;
381 /** The do-it-yourself (byte) sex-change kit */
383 /* The middle letter e.g. get<b>short indicates Big or Little endian
384 target machine. It doesn't matter what the byte order of the host
385 machine is; these routines work for either. */
387 /* FIXME: Should these take a count argument?
389 functions in swap.h #ifdef __GNUC__.
390 Gprof them later and find out. */
399 These macros as used for reading and writing raw data in
400 sections; each access (except for bytes) is vectored through
401 the target format of the BFD and mangled accordingly. The
402 mangling performs any necessary endian translations and
403 removes alignment restrictions. Note that types accepted and
404 returned by these macros are identical so they can be swapped
405 around in macros--for example libaout.h defines GET_WORD to
406 either bfd_get_32 or bfd_get_64.
408 .#define bfd_put_8(abfd, val, ptr) \
409 . (*((unsigned char *)ptr) = (unsigned char)val)
410 .#define bfd_put_signed_8(abfd, val, ptr) (*((char *)(ptr)) = (char)(val))
411 .#define bfd_get_8(abfd, ptr) \
412 . (*((unsigned char *)(ptr)))
413 .#define bfd_get_signed_8(abfd, ptr) (((*(char *)(ptr) ^ 0x80) & 0xff) - 0x80)
414 .#define bfd_put_16(abfd, val, ptr) \
415 . BFD_SEND(abfd, bfd_putx16, ((bfd_vma)(val),(ptr)))
416 .#define bfd_put_signed_16 bfd_put_16
417 .#define bfd_get_16(abfd, ptr) \
418 . BFD_SEND(abfd, bfd_getx16, (ptr))
419 .#define bfd_get_signed_16(abfd, ptr) \
420 . BFD_SEND (abfd, bfd_getx_signed_16, (ptr))
421 .#define bfd_put_32(abfd, val, ptr) \
422 . BFD_SEND(abfd, bfd_putx32, ((bfd_vma)(val),(ptr)))
423 .#define bfd_put_signed_32 bfd_put_32
424 .#define bfd_get_32(abfd, ptr) \
425 . BFD_SEND(abfd, bfd_getx32, (ptr))
426 .#define bfd_get_signed_32(abfd, ptr) \
427 . BFD_SEND(abfd, bfd_getx_signed_32, (ptr))
428 .#define bfd_put_64(abfd, val, ptr) \
429 . BFD_SEND(abfd, bfd_putx64, ((bfd_vma)(val), (ptr)))
430 .#define bfd_put_signed_64 bfd_put_64
431 .#define bfd_get_64(abfd, ptr) \
432 . BFD_SEND(abfd, bfd_getx64, (ptr))
433 .#define bfd_get_signed_64(abfd, ptr) \
434 . BFD_SEND(abfd, bfd_getx_signed_64, (ptr))
445 These macros have the same function as their <<bfd_get_x>>
446 bretherin, except that they are used for removing information
447 for the header records of object files. Believe it or not,
448 some object files keep their header records in big endian
449 order, and their data in little endan order.
451 .#define bfd_h_put_8(abfd, val, ptr) \
452 . (*((unsigned char *)ptr) = (unsigned char)val)
453 .#define bfd_h_put_signed_8(abfd, val, ptr) (*((char *)(ptr)) = (char)(val))
454 .#define bfd_h_get_8(abfd, ptr) \
455 . (*((unsigned char *)(ptr)))
456 .#define bfd_h_get_signed_8 bfd_get_signed_8
457 .#define bfd_h_put_16(abfd, val, ptr) \
458 . BFD_SEND(abfd, bfd_h_putx16,(val,ptr))
459 .#define bfd_h_put_signed_16 bfd_h_put_16
460 .#define bfd_h_get_16(abfd, ptr) \
461 . BFD_SEND(abfd, bfd_h_getx16,(ptr))
462 .#define bfd_h_get_signed_16(abfd, ptr) \
463 . BFD_SEND(abfd, bfd_h_getx_signed_16, (ptr))
464 .#define bfd_h_put_32(abfd, val, ptr) \
465 . BFD_SEND(abfd, bfd_h_putx32,(val,ptr))
466 .#define bfd_h_put_signed_32 bfd_h_put_32
467 .#define bfd_h_get_32(abfd, ptr) \
468 . BFD_SEND(abfd, bfd_h_getx32,(ptr))
469 .#define bfd_h_get_signed_32(abfd, ptr) \
470 . BFD_SEND(abfd, bfd_h_getx_signed_32, (ptr))
471 .#define bfd_h_put_64(abfd, val, ptr) \
472 . BFD_SEND(abfd, bfd_h_putx64,(val, ptr))
473 .#define bfd_h_put_signed_64 bfd_h_put_64
474 .#define bfd_h_get_64(abfd, ptr) \
475 . BFD_SEND(abfd, bfd_h_getx64,(ptr))
476 .#define bfd_h_get_signed_64(abfd, ptr) \
477 . BFD_SEND(abfd, bfd_h_getx_signed_64, (ptr))
481 /* Sign extension to bfd_signed_vma. */
482 #define COERCE16(x) ((bfd_signed_vma) (((x) ^ 0x8000) - 0x8000))
483 #define COERCE32(x) ((bfd_signed_vma) (((x) ^ 0x80000000) - 0x80000000))
484 #define COERCE64(x) ((bfd_signed_vma)\
485 (((x) ^ 0x8000000000000000) - 0x8000000000000000))
488 DEFUN(_do_getb16,(addr),
489 register bfd_byte *addr)
491 return (addr[0] << 8) | addr[1];
495 DEFUN(_do_getl16,(addr),
496 register bfd_byte *addr)
498 return (addr[1] << 8) | addr[0];
502 DEFUN(_do_getb_signed_16,(addr),
503 register bfd_byte *addr)
505 return COERCE16((addr[0] << 8) | addr[1]);
509 DEFUN(_do_getl_signed_16,(addr),
510 register bfd_byte *addr)
512 return COERCE16((addr[1] << 8) | addr[0]);
516 DEFUN(_do_putb16,(data, addr),
518 register bfd_byte *addr)
520 addr[0] = (bfd_byte)(data >> 8);
521 addr[1] = (bfd_byte )data;
525 DEFUN(_do_putl16,(data, addr),
527 register bfd_byte *addr)
529 addr[0] = (bfd_byte )data;
530 addr[1] = (bfd_byte)(data >> 8);
535 register bfd_byte *addr;
537 return ((((addr[0] << 8) | addr[1]) << 8) | addr[2]) << 8 | addr[3];
542 register bfd_byte *addr;
544 return ((((addr[3] << 8) | addr[2]) << 8) | addr[1]) << 8 | addr[0];
548 _do_getb_signed_32 (addr)
549 register bfd_byte *addr;
551 return COERCE32(((((addr[0] << 8) | addr[1]) << 8)
552 | addr[2]) << 8 | addr[3]);
556 _do_getl_signed_32 (addr)
557 register bfd_byte *addr;
559 return COERCE32(((((addr[3] << 8) | addr[2]) << 8)
560 | addr[1]) << 8 | addr[0]);
564 DEFUN(_do_getb64,(addr),
565 register bfd_byte *addr)
570 high= ((((((((addr[0]) << 8) |
575 low = ((((((((addr[4]) << 8) |
580 return high << 32 | low;
589 DEFUN(_do_getl64,(addr),
590 register bfd_byte *addr)
595 high= (((((((addr[7] << 8) |
600 low = (((((((addr[3] << 8) |
605 return high << 32 | low;
614 DEFUN(_do_getb_signed_64,(addr),
615 register bfd_byte *addr)
620 high= ((((((((addr[0]) << 8) |
625 low = ((((((((addr[4]) << 8) |
630 return COERCE64(high << 32 | low);
639 DEFUN(_do_getl_signed_64,(addr),
640 register bfd_byte *addr)
645 high= (((((((addr[7] << 8) |
650 low = (((((((addr[3] << 8) |
655 return COERCE64(high << 32 | low);
664 DEFUN(_do_putb32,(data, addr),
666 register bfd_byte *addr)
668 addr[0] = (bfd_byte)(data >> 24);
669 addr[1] = (bfd_byte)(data >> 16);
670 addr[2] = (bfd_byte)(data >> 8);
671 addr[3] = (bfd_byte)data;
675 DEFUN(_do_putl32,(data, addr),
677 register bfd_byte *addr)
679 addr[0] = (bfd_byte)data;
680 addr[1] = (bfd_byte)(data >> 8);
681 addr[2] = (bfd_byte)(data >> 16);
682 addr[3] = (bfd_byte)(data >> 24);
685 DEFUN(_do_putb64,(data, addr),
687 register bfd_byte *addr)
690 addr[0] = (bfd_byte)(data >> (7*8));
691 addr[1] = (bfd_byte)(data >> (6*8));
692 addr[2] = (bfd_byte)(data >> (5*8));
693 addr[3] = (bfd_byte)(data >> (4*8));
694 addr[4] = (bfd_byte)(data >> (3*8));
695 addr[5] = (bfd_byte)(data >> (2*8));
696 addr[6] = (bfd_byte)(data >> (1*8));
697 addr[7] = (bfd_byte)(data >> (0*8));
705 DEFUN(_do_putl64,(data, addr),
707 register bfd_byte *addr)
710 addr[7] = (bfd_byte)(data >> (7*8));
711 addr[6] = (bfd_byte)(data >> (6*8));
712 addr[5] = (bfd_byte)(data >> (5*8));
713 addr[4] = (bfd_byte)(data >> (4*8));
714 addr[3] = (bfd_byte)(data >> (3*8));
715 addr[2] = (bfd_byte)(data >> (2*8));
716 addr[1] = (bfd_byte)(data >> (1*8));
717 addr[0] = (bfd_byte)(data >> (0*8));
725 /* Default implementation */
728 DEFUN(bfd_generic_get_section_contents, (abfd, section, location, offset, count),
737 if ((bfd_size_type)(offset+count) > section->_raw_size
738 || bfd_seek(abfd, (file_ptr)(section->filepos + offset), SEEK_SET) == -1
739 || bfd_read(location, (bfd_size_type)1, count, abfd) != count)
740 return (false); /* on error */
744 /* This generic function can only be used in implementations where creating
745 NEW sections is disallowed. It is useful in patching existing sections
746 in read-write files, though. See other set_section_contents functions
747 to see why it doesn't work for new sections. */
749 DEFUN(bfd_generic_set_section_contents, (abfd, section, location, offset, count),
758 if ((bfd_size_type)(offset+count) > bfd_get_section_size_after_reloc(section)
759 || bfd_seek(abfd, (file_ptr)(section->filepos + offset), SEEK_SET) == -1
760 || bfd_write(location, (bfd_size_type)1, count, abfd) != count)
761 return (false); /* on error */
770 Return the log base 2 of the value supplied, rounded up. eg an
771 arg of 1025 would return 11.
774 bfd_vma bfd_log2(bfd_vma x);
781 while ( (bfd_vma)(1<< result) < x)