1 /* Assorted BFD support routines, only used internally.
2 Copyright 1990, 91, 92, 93, 94 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 static int real_read PARAMS ((PTR, size_t, size_t, FILE *));
32 These routines are used within BFD.
33 They are not intended for export, but are documented here for
37 /* A routine which is used in target vectors for unsupported
45 bfd_set_error (bfd_error_invalid_operation);
49 /* A routine which is used in target vectors for supported operations
50 which do not actually do anything. */
60 /* A routine which is used in target vectors for unsupported
61 operations which return a pointer value. */
65 bfd_nullvoidptr (ignore)
68 bfd_set_error (bfd_error_invalid_operation);
96 /* A routine which is used in target vectors for unsupported
97 operations which return -1 on error. */
101 _bfd_n1 (ignore_abfd)
104 bfd_set_error (bfd_error_invalid_operation);
117 _bfd_nocore_core_file_matches_executable_p (ignore_core_bfd, ignore_exec_bfd)
118 bfd *ignore_core_bfd;
119 bfd *ignore_exec_bfd;
121 bfd_set_error (bfd_error_invalid_operation);
125 /* Routine to handle core_file_failing_command entry point for targets
126 without core file support. */
130 _bfd_nocore_core_file_failing_command (ignore_abfd)
133 bfd_set_error (bfd_error_invalid_operation);
137 /* Routine to handle core_file_failing_signal entry point for targets
138 without core file support. */
142 _bfd_nocore_core_file_failing_signal (ignore_abfd)
145 bfd_set_error (bfd_error_invalid_operation);
151 _bfd_dummy_target (ignore_abfd)
154 bfd_set_error (bfd_error_wrong_format);
160 /* allocate and clear storage */
166 char *ptr = (char *) malloc ((size_t) size);
169 memset(ptr, 0, (size_t) size);
173 #endif /* bfd_zmalloc */
178 /* Note that archive entries don't have streams; they share their parent's.
179 This allows someone to play with the iostream behind BFD's back.
181 Also, note that the origin pointer points to the beginning of a file's
182 contents (0 for non-archive elements). For archive entries this is the
183 first octet in the file, NOT the beginning of the archive header. */
186 real_read (where, a,b, file)
192 return fread (where, a, b, file);
195 /* Return value is amount read (FIXME: how are errors and end of file dealt
196 with? We never call bfd_set_error, which is probably a mistake). */
199 bfd_read (ptr, size, nitems, abfd)
202 bfd_size_type nitems;
206 nread = real_read (ptr, 1, (size_t)(size*nitems), bfd_cache_lookup(abfd));
207 #ifdef FILE_OFFSET_IS_CHAR_INDEX
209 abfd->where += nread;
212 /* Set bfd_error if we did not read as much data as we expected.
214 If the read failed due to an error set the bfd_error_system_call,
215 else set bfd_error_file_truncated.
217 A BFD backend may wish to override bfd_error_file_truncated to
218 provide something more useful (eg. no_symbols or wrong_format). */
219 if (nread < (int)(size * nitems))
221 if (ferror (bfd_cache_lookup (abfd)))
222 bfd_set_error (bfd_error_system_call);
224 bfd_set_error (bfd_error_file_truncated);
230 /* The window support stuff should probably be broken out into
232 /* The idea behind the next and refcount fields is that one mapped
233 region can suffice for multiple read-only windows or multiple
234 non-overlapping read-write windows. It's not implemented yet
236 struct _bfd_window_internal {
237 struct _bfd_window_internal *next;
240 int refcount : 31; /* should be enough... */
241 unsigned mapped : 1; /* 1 = mmap, 0 = malloc */
245 bfd_init_window (windowp)
253 #undef HAVE_MPROTECT /* code's not tested yet */
255 #if HAVE_MMAP || HAVE_MPROTECT
256 #include <sys/types.h>
257 #include <sys/mman.h>
264 static int debug_windows;
267 bfd_free_window (windowp)
270 bfd_window_internal *i = windowp->i;
277 fprintf (stderr, "freeing window @%p<%p,%lx,%p>\n",
278 windowp, windowp->data, windowp->size, windowp->i);
279 if (i->refcount != 0)
285 munmap (i->data, i->size);
292 mprotect (i->data, i->size, PROT_READ | PROT_WRITE);
299 /* There should be no more references to i at this point. */
303 static int ok_to_map = 1;
306 bfd_get_file_window (abfd, offset, size, windowp, writable)
313 static size_t pagesize;
314 bfd_window_internal *i = windowp->i;
315 size_t size_to_alloc = size;
318 fprintf (stderr, "bfd_get_file_window (%p, %6ld, %6ld, %p<%p,%lx,%p>, %d)",
319 abfd, (long) offset, (long) size,
320 windowp, windowp->data, windowp->size, windowp->i,
323 /* Make sure we know the page size, so we can be friendly to mmap. */
325 pagesize = getpagesize ();
331 windowp->i = i = (bfd_window_internal *) bfd_zmalloc (sizeof (bfd_window_internal));
337 if (ok_to_map && (i->data == 0 || i->mapped == 1))
339 file_ptr file_offset, offset2;
344 /* Find the real file and the real offset into it. */
345 while (abfd->my_archive != NULL)
347 offset += abfd->origin;
348 abfd = abfd->my_archive;
350 f = bfd_cache_lookup (abfd);
353 /* Compute offsets and size for mmap and for the user's data. */
354 offset2 = offset % pagesize;
357 file_offset = offset - offset2;
358 real_size = offset + size - file_offset;
359 real_size = real_size + pagesize - 1;
360 real_size -= real_size % pagesize;
362 /* If we're re-using a memory region, make sure it's big enough. */
363 if (i->data && i->size < size)
365 munmap (i->data, i->size);
368 i->data = mmap (i->data, real_size,
369 writable ? PROT_WRITE | PROT_READ : PROT_READ,
370 writable ? MAP_FILE | MAP_PRIVATE : MAP_FILE,
372 if (i->data == (PTR) -1)
374 /* An error happened. Report it, or try using malloc, or
376 bfd_set_error (bfd_error_system_call);
380 fprintf (stderr, "\t\tmmap failed!\n");
384 fprintf (stderr, "\n\tmapped %ld at %p, offset is %ld\n",
385 (long) real_size, i->data, (long) offset2);
387 windowp->data = i->data + offset2;
388 windowp->size = size;
392 else if (debug_windows)
395 fprintf (stderr, "not mapping: data=%x mapped=%d\n",
398 fprintf (stderr, "not mapping: env var not set\n");
407 size_to_alloc += pagesize - 1;
408 size_to_alloc -= size_to_alloc % pagesize;
412 fprintf (stderr, "\n\t%s(%6ld)",
413 i->data ? "realloc" : " malloc", (long) size_to_alloc);
415 i->data = (PTR) realloc (i->data, size_to_alloc);
417 i->data = (PTR) malloc (size_to_alloc);
419 fprintf (stderr, "\t-> %p\n", i->data);
423 if (size_to_alloc == 0)
425 bfd_set_error (bfd_error_no_memory);
428 if (bfd_seek (abfd, offset, SEEK_SET) != 0)
430 i->size = bfd_read (i->data, size, 1, abfd);
438 fprintf (stderr, "\tmprotect (%p, %ld, PROT_READ)\n", i->data,
440 mprotect (i->data, i->size, PROT_READ);
443 windowp->data = i->data;
444 windowp->size = i->size;
449 bfd_write (ptr, size, nitems, abfd)
452 bfd_size_type nitems;
455 long nwrote = fwrite (ptr, 1, (size_t) (size * nitems),
456 bfd_cache_lookup (abfd));
457 #ifdef FILE_OFFSET_IS_CHAR_INDEX
459 abfd->where += nwrote;
461 if ((bfd_size_type) nwrote != size * nitems)
467 bfd_set_error (bfd_error_system_call);
474 bfd_write_bigendian_4byte_int
477 void bfd_write_bigendian_4byte_int(bfd *abfd, int i);
480 Write a 4 byte integer @var{i} to the output BFD @var{abfd}, in big
481 endian order regardless of what else is going on. This is useful in
486 bfd_write_bigendian_4byte_int (abfd, i)
491 bfd_putb32(i, buffer);
492 if (bfd_write((PTR)buffer, 4, 1, abfd) != 4)
502 ptr = ftell (bfd_cache_lookup(abfd));
504 if (abfd->my_archive)
514 return fflush (bfd_cache_lookup(abfd));
517 /* Returns 0 for success, negative value for failure (in which case
518 bfd_get_error can retrieve the error code). */
520 bfd_stat (abfd, statbuf)
522 struct stat *statbuf;
526 f = bfd_cache_lookup (abfd);
529 bfd_set_error (bfd_error_system_call);
532 result = fstat (fileno (f), statbuf);
534 bfd_set_error (bfd_error_system_call);
538 /* Returns 0 for success, nonzero for failure (in which case bfd_get_error
539 can retrieve the error code). */
542 bfd_seek (abfd, position, direction)
549 file_ptr file_position;
550 /* For the time being, a BFD may not seek to it's end. The problem
551 is that we don't easily have a way to recognize the end of an
552 element in an archive. */
554 BFD_ASSERT (direction == SEEK_SET || direction == SEEK_CUR);
556 if (direction == SEEK_CUR && position == 0)
558 #ifdef FILE_OFFSET_IS_CHAR_INDEX
559 if (abfd->format != bfd_archive && abfd->my_archive == 0)
562 /* Explanation for this code: I'm only about 95+% sure that the above
563 conditions are sufficient and that all i/o calls are properly
564 adjusting the `where' field. So this is sort of an `assert'
565 that the `where' field is correct. If we can go a while without
566 tripping the abort, we can probably safely disable this code,
567 so that the real optimizations happen. */
568 file_ptr where_am_i_now;
569 where_am_i_now = ftell (bfd_cache_lookup (abfd));
570 if (abfd->my_archive)
571 where_am_i_now -= abfd->origin;
572 if (where_am_i_now != abfd->where)
575 if (direction == SEEK_SET && position == abfd->where)
580 /* We need something smarter to optimize access to archives.
581 Currently, anything inside an archive is read via the file
582 handle for the archive. Which means that a bfd_seek on one
583 component affects the `current position' in the archive, as
584 well as in any other component.
586 It might be sufficient to put a spike through the cache
587 abstraction, and look to the archive for the file position,
588 but I think we should try for something cleaner.
590 In the meantime, no optimization for archives. */
594 f = bfd_cache_lookup (abfd);
595 file_position = position;
596 if (direction == SEEK_SET && abfd->my_archive != NULL)
597 file_position += abfd->origin;
599 result = fseek (f, file_position, direction);
603 /* Force redetermination of `where' field. */
605 bfd_set_error (bfd_error_system_call);
609 #ifdef FILE_OFFSET_IS_CHAR_INDEX
610 /* Adjust `where' field. */
611 if (direction == SEEK_SET)
612 abfd->where = position;
614 abfd->where += position;
620 /** The do-it-yourself (byte) sex-change kit */
622 /* The middle letter e.g. get<b>short indicates Big or Little endian
623 target machine. It doesn't matter what the byte order of the host
624 machine is; these routines work for either. */
626 /* FIXME: Should these take a count argument?
627 Answer (gnu@cygnus.com): No, but perhaps they should be inline
628 functions in swap.h #ifdef __GNUC__.
629 Gprof them later and find out. */
638 These macros as used for reading and writing raw data in
639 sections; each access (except for bytes) is vectored through
640 the target format of the BFD and mangled accordingly. The
641 mangling performs any necessary endian translations and
642 removes alignment restrictions. Note that types accepted and
643 returned by these macros are identical so they can be swapped
644 around in macros---for example, @file{libaout.h} defines <<GET_WORD>>
645 to either <<bfd_get_32>> or <<bfd_get_64>>.
647 In the put routines, @var{val} must be a <<bfd_vma>>. If we are on a
648 system without prototypes, the caller is responsible for making
649 sure that is true, with a cast if necessary. We don't cast
650 them in the macro definitions because that would prevent <<lint>>
651 or <<gcc -Wall>> from detecting sins such as passing a pointer.
652 To detect calling these with less than a <<bfd_vma>>, use
653 <<gcc -Wconversion>> on a host with 64 bit <<bfd_vma>>'s.
656 .{* Byte swapping macros for user section data. *}
658 .#define bfd_put_8(abfd, val, ptr) \
659 . (*((unsigned char *)(ptr)) = (unsigned char)(val))
660 .#define bfd_put_signed_8 \
662 .#define bfd_get_8(abfd, ptr) \
663 . (*(unsigned char *)(ptr))
664 .#define bfd_get_signed_8(abfd, ptr) \
665 . ((*(unsigned char *)(ptr) ^ 0x80) - 0x80)
667 .#define bfd_put_16(abfd, val, ptr) \
668 . BFD_SEND(abfd, bfd_putx16, ((val),(ptr)))
669 .#define bfd_put_signed_16 \
671 .#define bfd_get_16(abfd, ptr) \
672 . BFD_SEND(abfd, bfd_getx16, (ptr))
673 .#define bfd_get_signed_16(abfd, ptr) \
674 . BFD_SEND (abfd, bfd_getx_signed_16, (ptr))
676 .#define bfd_put_32(abfd, val, ptr) \
677 . BFD_SEND(abfd, bfd_putx32, ((val),(ptr)))
678 .#define bfd_put_signed_32 \
680 .#define bfd_get_32(abfd, ptr) \
681 . BFD_SEND(abfd, bfd_getx32, (ptr))
682 .#define bfd_get_signed_32(abfd, ptr) \
683 . BFD_SEND(abfd, bfd_getx_signed_32, (ptr))
685 .#define bfd_put_64(abfd, val, ptr) \
686 . BFD_SEND(abfd, bfd_putx64, ((val), (ptr)))
687 .#define bfd_put_signed_64 \
689 .#define bfd_get_64(abfd, ptr) \
690 . BFD_SEND(abfd, bfd_getx64, (ptr))
691 .#define bfd_get_signed_64(abfd, ptr) \
692 . BFD_SEND(abfd, bfd_getx_signed_64, (ptr))
702 These macros have the same function as their <<bfd_get_x>>
703 bretheren, except that they are used for removing information
704 for the header records of object files. Believe it or not,
705 some object files keep their header records in big endian
706 order and their data in little endian order.
708 .{* Byte swapping macros for file header data. *}
710 .#define bfd_h_put_8(abfd, val, ptr) \
711 . bfd_put_8 (abfd, val, ptr)
712 .#define bfd_h_put_signed_8(abfd, val, ptr) \
713 . bfd_put_8 (abfd, val, ptr)
714 .#define bfd_h_get_8(abfd, ptr) \
715 . bfd_get_8 (abfd, ptr)
716 .#define bfd_h_get_signed_8(abfd, ptr) \
717 . bfd_get_signed_8 (abfd, ptr)
719 .#define bfd_h_put_16(abfd, val, ptr) \
720 . BFD_SEND(abfd, bfd_h_putx16,(val,ptr))
721 .#define bfd_h_put_signed_16 \
723 .#define bfd_h_get_16(abfd, ptr) \
724 . BFD_SEND(abfd, bfd_h_getx16,(ptr))
725 .#define bfd_h_get_signed_16(abfd, ptr) \
726 . BFD_SEND(abfd, bfd_h_getx_signed_16, (ptr))
728 .#define bfd_h_put_32(abfd, val, ptr) \
729 . BFD_SEND(abfd, bfd_h_putx32,(val,ptr))
730 .#define bfd_h_put_signed_32 \
732 .#define bfd_h_get_32(abfd, ptr) \
733 . BFD_SEND(abfd, bfd_h_getx32,(ptr))
734 .#define bfd_h_get_signed_32(abfd, ptr) \
735 . BFD_SEND(abfd, bfd_h_getx_signed_32, (ptr))
737 .#define bfd_h_put_64(abfd, val, ptr) \
738 . BFD_SEND(abfd, bfd_h_putx64,(val, ptr))
739 .#define bfd_h_put_signed_64 \
741 .#define bfd_h_get_64(abfd, ptr) \
742 . BFD_SEND(abfd, bfd_h_getx64,(ptr))
743 .#define bfd_h_get_signed_64(abfd, ptr) \
744 . BFD_SEND(abfd, bfd_h_getx_signed_64, (ptr))
748 /* Sign extension to bfd_signed_vma. */
749 #define COERCE16(x) (((bfd_signed_vma) (x) ^ 0x8000) - 0x8000)
750 #define COERCE32(x) (((bfd_signed_vma) (x) ^ 0x80000000) - 0x80000000)
751 #define EIGHT_GAZILLION (((BFD_HOST_64_BIT)0x80000000) << 32)
752 #define COERCE64(x) \
753 (((bfd_signed_vma) (x) ^ EIGHT_GAZILLION) - EIGHT_GAZILLION)
757 register const bfd_byte *addr;
759 return (addr[0] << 8) | addr[1];
764 register const bfd_byte *addr;
766 return (addr[1] << 8) | addr[0];
770 bfd_getb_signed_16 (addr)
771 register const bfd_byte *addr;
773 return COERCE16((addr[0] << 8) | addr[1]);
777 bfd_getl_signed_16 (addr)
778 register const bfd_byte *addr;
780 return COERCE16((addr[1] << 8) | addr[0]);
784 bfd_putb16 (data, addr)
786 register bfd_byte *addr;
788 addr[0] = (bfd_byte)(data >> 8);
789 addr[1] = (bfd_byte )data;
793 bfd_putl16 (data, addr)
795 register bfd_byte *addr;
797 addr[0] = (bfd_byte )data;
798 addr[1] = (bfd_byte)(data >> 8);
803 register const bfd_byte *addr;
805 return (((((bfd_vma)addr[0] << 8) | addr[1]) << 8)
806 | addr[2]) << 8 | addr[3];
811 register const bfd_byte *addr;
813 return (((((bfd_vma)addr[3] << 8) | addr[2]) << 8)
814 | addr[1]) << 8 | addr[0];
818 bfd_getb_signed_32 (addr)
819 register const bfd_byte *addr;
821 return COERCE32((((((bfd_vma)addr[0] << 8) | addr[1]) << 8)
822 | addr[2]) << 8 | addr[3]);
826 bfd_getl_signed_32 (addr)
827 register const bfd_byte *addr;
829 return COERCE32((((((bfd_vma)addr[3] << 8) | addr[2]) << 8)
830 | addr[1]) << 8 | addr[0]);
835 register const bfd_byte *addr;
840 high= ((((((((addr[0]) << 8) |
845 low = (((((((((bfd_vma)addr[4]) << 8) |
850 return high << 32 | low;
859 register const bfd_byte *addr;
863 high= (((((((addr[7] << 8) |
868 low = ((((((((bfd_vma)addr[3] << 8) |
873 return high << 32 | low;
882 bfd_getb_signed_64 (addr)
883 register const bfd_byte *addr;
888 high= ((((((((addr[0]) << 8) |
893 low = (((((((((bfd_vma)addr[4]) << 8) |
898 return COERCE64(high << 32 | low);
906 bfd_getl_signed_64 (addr)
907 register const bfd_byte *addr;
911 high= (((((((addr[7] << 8) |
916 low = ((((((((bfd_vma)addr[3] << 8) |
921 return COERCE64(high << 32 | low);
929 bfd_putb32 (data, addr)
931 register bfd_byte *addr;
933 addr[0] = (bfd_byte)(data >> 24);
934 addr[1] = (bfd_byte)(data >> 16);
935 addr[2] = (bfd_byte)(data >> 8);
936 addr[3] = (bfd_byte)data;
940 bfd_putl32 (data, addr)
942 register bfd_byte *addr;
944 addr[0] = (bfd_byte)data;
945 addr[1] = (bfd_byte)(data >> 8);
946 addr[2] = (bfd_byte)(data >> 16);
947 addr[3] = (bfd_byte)(data >> 24);
951 bfd_putb64 (data, addr)
953 register bfd_byte *addr;
956 addr[0] = (bfd_byte)(data >> (7*8));
957 addr[1] = (bfd_byte)(data >> (6*8));
958 addr[2] = (bfd_byte)(data >> (5*8));
959 addr[3] = (bfd_byte)(data >> (4*8));
960 addr[4] = (bfd_byte)(data >> (3*8));
961 addr[5] = (bfd_byte)(data >> (2*8));
962 addr[6] = (bfd_byte)(data >> (1*8));
963 addr[7] = (bfd_byte)(data >> (0*8));
970 bfd_putl64 (data, addr)
972 register bfd_byte *addr;
975 addr[7] = (bfd_byte)(data >> (7*8));
976 addr[6] = (bfd_byte)(data >> (6*8));
977 addr[5] = (bfd_byte)(data >> (5*8));
978 addr[4] = (bfd_byte)(data >> (4*8));
979 addr[3] = (bfd_byte)(data >> (3*8));
980 addr[2] = (bfd_byte)(data >> (2*8));
981 addr[1] = (bfd_byte)(data >> (1*8));
982 addr[0] = (bfd_byte)(data >> (0*8));
988 /* Default implementation */
991 _bfd_generic_get_section_contents (abfd, section, location, offset, count)
1000 if ((bfd_size_type)(offset+count) > section->_raw_size
1001 || bfd_seek(abfd, (file_ptr)(section->filepos + offset), SEEK_SET) == -1
1002 || bfd_read(location, (bfd_size_type)1, count, abfd) != count)
1003 return (false); /* on error */
1008 _bfd_generic_get_section_contents_in_window (abfd, section, w, offset, count)
1013 bfd_size_type count;
1017 if (abfd->xvec->_bfd_get_section_contents != _bfd_generic_get_section_contents)
1019 /* We don't know what changes the bfd's get_section_contents
1020 method may have to make. So punt trying to map the file
1021 window, and let get_section_contents do its thing. */
1022 /* @@ FIXME : If the internal window has a refcount of 1 and was
1023 allocated with malloc instead of mmap, just reuse it. */
1024 bfd_free_window (w);
1025 w->i = (bfd_window_internal *) bfd_zmalloc (sizeof (bfd_window_internal));
1028 w->i->data = (PTR) malloc ((size_t) count);
1029 if (w->i->data == NULL)
1037 w->size = w->i->size = count;
1038 w->data = w->i->data;
1039 return bfd_get_section_contents (abfd, section, w->data, offset, count);
1041 if ((bfd_size_type) (offset+count) > section->_raw_size
1042 || (bfd_get_file_window (abfd, section->filepos + offset, count, w, 1)
1048 /* This generic function can only be used in implementations where creating
1049 NEW sections is disallowed. It is useful in patching existing sections
1050 in read-write files, though. See other set_section_contents functions
1051 to see why it doesn't work for new sections. */
1053 _bfd_generic_set_section_contents (abfd, section, location, offset, count)
1058 bfd_size_type count;
1063 if (bfd_seek (abfd, (file_ptr) (section->filepos + offset), SEEK_SET) == -1
1064 || bfd_write (location, (bfd_size_type) 1, count, abfd) != count)
1075 unsigned int bfd_log2(bfd_vma x);
1078 Return the log base 2 of the value supplied, rounded up. E.g., an
1079 @var{x} of 1025 returns 11.
1086 unsigned result = 0;
1087 while ( (bfd_vma)(1<< result) < x)
1093 bfd_generic_is_local_label (abfd, sym)
1097 char locals_prefix = (bfd_get_symbol_leading_char (abfd) == '_') ? 'L' : '.';
1099 return (sym->name[0] == locals_prefix);