/* opncls.c -- open and close a BFD.
Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
- 2001, 2002
+ 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
Written by Cygnus Support.
#include "sysdep.h"
#include "objalloc.h"
#include "libbfd.h"
+#include "libiberty.h"
#ifndef S_IXUSR
#define S_IXUSR 0100 /* Execute by owner. */
#define S_IXOTH 0001 /* Execute by others. */
#endif
+/* Counter used to initialize the bfd identifier. */
+
+static unsigned int _bfd_id_counter = 0;
+
/* fdopen is a loser -- we should use stdio exclusively. Unfortunately
if we do that we can't use fcntl. */
/* Return a new BFD. All BFD's are allocated through this routine. */
bfd *
-_bfd_new_bfd ()
+_bfd_new_bfd (void)
{
bfd *nbfd;
- nbfd = (bfd *) bfd_zmalloc ((bfd_size_type) sizeof (bfd));
+ nbfd = bfd_zmalloc (sizeof (bfd));
if (nbfd == NULL)
return NULL;
- nbfd->memory = (PTR) objalloc_create ();
+ nbfd->id = _bfd_id_counter++;
+
+ nbfd->memory = objalloc_create ();
if (nbfd->memory == NULL)
{
bfd_set_error (bfd_error_no_memory);
nbfd->direction = no_direction;
nbfd->iostream = NULL;
nbfd->where = 0;
- if (!bfd_hash_table_init_n (&nbfd->section_htab,
- bfd_section_hash_newfunc,
+ if (!bfd_hash_table_init_n (& nbfd->section_htab, bfd_section_hash_newfunc,
251))
{
free (nbfd);
return NULL;
}
- nbfd->sections = (asection *) NULL;
+ nbfd->sections = NULL;
nbfd->section_tail = &nbfd->sections;
nbfd->format = bfd_unknown;
- nbfd->my_archive = (bfd *) NULL;
+ nbfd->my_archive = NULL;
nbfd->origin = 0;
nbfd->opened_once = FALSE;
nbfd->output_has_begun = FALSE;
nbfd->section_count = 0;
- nbfd->usrdata = (PTR) NULL;
+ nbfd->usrdata = NULL;
nbfd->cacheable = FALSE;
nbfd->flags = BFD_NO_FLAGS;
nbfd->mtime_set = FALSE;
/* Allocate a new BFD as a member of archive OBFD. */
bfd *
-_bfd_new_bfd_contained_in (obfd)
- bfd *obfd;
+_bfd_new_bfd_contained_in (bfd *obfd)
{
bfd *nbfd;
if (nbfd == NULL)
return NULL;
nbfd->xvec = obfd->xvec;
+ nbfd->iovec = obfd->iovec;
nbfd->my_archive = obfd;
nbfd->direction = read_direction;
nbfd->target_defaulted = obfd->target_defaulted;
/* Delete a BFD. */
void
-_bfd_delete_bfd (abfd)
- bfd *abfd;
+_bfd_delete_bfd (bfd *abfd)
{
bfd_hash_table_free (&abfd->section_htab);
objalloc_free ((struct objalloc *) abfd->memory);
bfd_openr
SYNOPSIS
- bfd *bfd_openr(const char *filename, const char *target);
+ bfd *bfd_openr (const char *filename, const char *target);
DESCRIPTION
Open the file @var{filename} (using <<fopen>>) with the target
*/
bfd *
-bfd_openr (filename, target)
- const char *filename;
- const char *target;
+bfd_openr (const char *filename, const char *target)
{
bfd *nbfd;
const bfd_target *target_vec;
bfd_fdopenr
SYNOPSIS
- bfd *bfd_fdopenr(const char *filename, const char *target, int fd);
+ bfd *bfd_fdopenr (const char *filename, const char *target, int fd);
DESCRIPTION
<<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to
descriptors for other opens), with the supplied @var{fd} used as
an initial file descriptor (but subject to closure at any time),
call bfd_set_cacheable(bfd, 1) on the returned BFD. The default
- is to assume no cacheing; the file descriptor will remain open
+ is to assume no caching; the file descriptor will remain open
until <<bfd_close>>, and will not be affected by BFD operations
on other files.
*/
bfd *
-bfd_fdopenr (filename, target, fd)
- const char *filename;
- const char *target;
- int fd;
+bfd_fdopenr (const char *filename, const char *target, int fd)
{
bfd *nbfd;
const bfd_target *target_vec;
}
#ifndef HAVE_FDOPEN
- nbfd->iostream = (PTR) fopen (filename, FOPEN_RB);
+ nbfd->iostream = fopen (filename, FOPEN_RB);
#else
/* (O_ACCMODE) parens are to avoid Ultrix header file bug. */
switch (fdflags & (O_ACCMODE))
{
- case O_RDONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RB); break;
- case O_WRONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB); break;
- case O_RDWR: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB); break;
+ case O_RDONLY: nbfd->iostream = fdopen (fd, FOPEN_RB); break;
+ case O_WRONLY: nbfd->iostream = fdopen (fd, FOPEN_RUB); break;
+ case O_RDWR: nbfd->iostream = fdopen (fd, FOPEN_RUB); break;
default: abort ();
}
#endif
bfd_openstreamr
SYNOPSIS
- bfd *bfd_openstreamr(const char *, const char *, PTR);
+ bfd *bfd_openstreamr (const char *, const char *, void *);
DESCRIPTION
*/
bfd *
-bfd_openstreamr (filename, target, streamarg)
- const char *filename;
- const char *target;
- PTR streamarg;
+bfd_openstreamr (const char *filename, const char *target, void *streamarg)
{
- FILE *stream = (FILE *) streamarg;
+ FILE *stream = streamarg;
bfd *nbfd;
const bfd_target *target_vec;
return NULL;
}
- nbfd->iostream = (PTR) stream;
+ nbfd->iostream = stream;
nbfd->filename = filename;
nbfd->direction = read_direction;
return nbfd;
}
+
+/*
+FUNCTION
+ bfd_openr_iovec
+
+SYNOPSIS
+ bfd *bfd_openr_iovec (const char *filename, const char *target,
+ void *(*open) (struct bfd *nbfd,
+ void *open_closure),
+ void *open_closure,
+ file_ptr (*pread) (struct bfd *nbfd,
+ void *stream,
+ void *buf,
+ file_ptr nbytes,
+ file_ptr offset),
+ int (*close) (struct bfd *nbfd,
+ void *stream));
+
+DESCRIPTION
+
+ Create and return a BFD backed by a read-only @var{stream}.
+ The @var{stream} is created using @var{open}, accessed using
+ @var{pread} and destroyed using @var{close}.
+
+ Calls <<bfd_find_target>>, so @var{target} is interpreted as by
+ that function.
+
+ Calls @var{open} (which can call <<bfd_zalloc>> and
+ <<bfd_get_filename>>) to obtain the read-only stream backing
+ the BFD. @var{open} either succeeds returning the
+ non-<<NULL>> @var{stream}, or fails returning <<NULL>>
+ (setting <<bfd_error>>).
+
+ Calls @var{pread} to request @var{nbytes} of data from
+ @var{stream} starting at @var{offset} (e.g., via a call to
+ <<bfd_read>>). @var{pread} either succeeds returning the
+ number of bytes read (which can be less than @var{nbytes} when
+ end-of-file), or fails returning -1 (setting <<bfd_error>>).
+
+ Calls @var{close} when the BFD is later closed using
+ <<bfd_close>>. @var{close} either succeeds returning 0, or
+ fails returning -1 (setting <<bfd_error>>).
+
+ If <<bfd_openr_iovec>> returns <<NULL>> then an error has
+ occurred. Possible errors are <<bfd_error_no_memory>>,
+ <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
+
+*/
+
+struct opncls
+{
+ void *stream;
+ file_ptr (*pread) (struct bfd *abfd, void *stream, void *buf,
+ file_ptr nbytes, file_ptr offset);
+ int (*close) (struct bfd *abfd, void *stream);
+ file_ptr where;
+};
+
+static file_ptr
+opncls_btell (struct bfd *abfd)
+{
+ struct opncls *vec = abfd->iostream;
+ return vec->where;
+}
+
+static int
+opncls_bseek (struct bfd *abfd, file_ptr offset, int whence)
+{
+ struct opncls *vec = abfd->iostream;
+ switch (whence)
+ {
+ case SEEK_SET: vec->where = offset; break;
+ case SEEK_CUR: vec->where += offset; break;
+ case SEEK_END: return -1;
+ }
+ return 0;
+}
+
+static file_ptr
+opncls_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
+{
+ struct opncls *vec = abfd->iostream;
+ file_ptr nread = vec->pread (abfd, vec->stream, buf, nbytes, vec->where);
+ if (nread < 0)
+ return nread;
+ vec->where += nread;
+ return nread;
+}
+
+static file_ptr
+opncls_bwrite (struct bfd *abfd ATTRIBUTE_UNUSED,
+ const void *where ATTRIBUTE_UNUSED,
+ file_ptr nbytes ATTRIBUTE_UNUSED)
+{
+ return -1;
+}
+
+static int
+opncls_bclose (struct bfd *abfd)
+{
+ struct opncls *vec = abfd->iostream;
+ /* Since the VEC's memory is bound to the bfd deleting the bfd will
+ free it. */
+ int status = 0;
+ if (vec->close != NULL)
+ status = vec->close (abfd, vec->stream);
+ abfd->iostream = NULL;
+ return status;
+}
+
+static int
+opncls_bflush (struct bfd *abfd ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
+static int
+opncls_bstat (struct bfd *abfd ATTRIBUTE_UNUSED, struct stat *sb)
+{
+ memset (sb, 0, sizeof (*sb));
+ return 0;
+}
+
+static const struct bfd_iovec opncls_iovec = {
+ &opncls_bread, &opncls_bwrite, &opncls_btell, &opncls_bseek,
+ &opncls_bclose, &opncls_bflush, &opncls_bstat
+};
+
+bfd *
+bfd_openr_iovec (const char *filename, const char *target,
+ void *(*open) (struct bfd *nbfd,
+ void *open_closure),
+ void *open_closure,
+ file_ptr (*pread) (struct bfd *abfd,
+ void *stream,
+ void *buf,
+ file_ptr nbytes,
+ file_ptr offset),
+ int (*close) (struct bfd *nbfd,
+ void *stream))
+{
+ bfd *nbfd;
+ const bfd_target *target_vec;
+ struct opncls *vec;
+ void *stream;
+
+ nbfd = _bfd_new_bfd ();
+ if (nbfd == NULL)
+ return NULL;
+
+ target_vec = bfd_find_target (target, nbfd);
+ if (target_vec == NULL)
+ {
+ _bfd_delete_bfd (nbfd);
+ return NULL;
+ }
+
+ nbfd->filename = filename;
+ nbfd->direction = read_direction;
+
+ stream = open (nbfd, open_closure);
+ if (stream == NULL)
+ {
+ _bfd_delete_bfd (nbfd);
+ return NULL;
+ }
+
+ vec = bfd_zalloc (nbfd, sizeof (struct opncls));
+ vec->stream = stream;
+ vec->pread = pread;
+ vec->close = close;
+
+ nbfd->iovec = &opncls_iovec;
+ nbfd->iostream = vec;
+
+ return nbfd;
+}
\f
/* bfd_openw -- open for writing.
Returns a pointer to a freshly-allocated BFD on success, or NULL.
bfd_openw
SYNOPSIS
- bfd *bfd_openw(const char *filename, const char *target);
+ bfd *bfd_openw (const char *filename, const char *target);
DESCRIPTION
Create a BFD, associated with file @var{filename}, using the
*/
bfd *
-bfd_openw (filename, target)
- const char *filename;
- const char *target;
+bfd_openw (const char *filename, const char *target)
{
bfd *nbfd;
const bfd_target *target_vec;
bfd_boolean
-bfd_close (abfd)
- bfd *abfd;
+bfd_close (bfd *abfd)
{
bfd_boolean ret;
if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
return FALSE;
- ret = bfd_cache_close (abfd);
+ /* FIXME: cagney/2004-02-15: Need to implement a BFD_IN_MEMORY io
+ vector. */
+ if (!(abfd->flags & BFD_IN_MEMORY))
+ ret = abfd->iovec->bclose (abfd);
+ else
+ ret = TRUE;
/* If the file was open for writing and is now executable,
make it so. */
*/
bfd_boolean
-bfd_close_all_done (abfd)
- bfd *abfd;
+bfd_close_all_done (bfd *abfd)
{
bfd_boolean ret;
bfd_create
SYNOPSIS
- bfd *bfd_create(const char *filename, bfd *templ);
+ bfd *bfd_create (const char *filename, bfd *templ);
DESCRIPTION
Create a new BFD in the manner of <<bfd_openw>>, but without
*/
bfd *
-bfd_create (filename, templ)
- const char *filename;
- bfd *templ;
+bfd_create (const char *filename, bfd *templ)
{
bfd *nbfd;
*/
bfd_boolean
-bfd_make_writable(abfd)
- bfd *abfd;
+bfd_make_writable (bfd *abfd)
{
struct bfd_in_memory *bim;
return FALSE;
}
- bim = ((struct bfd_in_memory *)
- bfd_malloc ((bfd_size_type) sizeof (struct bfd_in_memory)));
- abfd->iostream = (PTR) bim;
+ bim = bfd_malloc (sizeof (struct bfd_in_memory));
+ abfd->iostream = bim;
/* bfd_bwrite will grow these as needed. */
bim->size = 0;
bim->buffer = 0;
<<TRUE>> is returned if all is ok, otherwise <<FALSE>>. */
bfd_boolean
-bfd_make_readable(abfd)
- bfd *abfd;
+bfd_make_readable (bfd *abfd)
{
if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY))
{
abfd->where = 0;
abfd->format = bfd_unknown;
- abfd->my_archive = (bfd *) NULL;
+ abfd->my_archive = NULL;
abfd->origin = 0;
abfd->opened_once = FALSE;
abfd->output_has_begun = FALSE;
abfd->section_count = 0;
- abfd->usrdata = (PTR) NULL;
+ abfd->usrdata = NULL;
abfd->cacheable = FALSE;
abfd->flags = BFD_IN_MEMORY;
abfd->mtime_set = FALSE;
bfd_alloc
SYNOPSIS
- PTR bfd_alloc (bfd *abfd, size_t wanted);
+ void *bfd_alloc (bfd *abfd, bfd_size_type wanted);
DESCRIPTION
Allocate a block of @var{wanted} bytes of memory attached to
*/
-PTR
-bfd_alloc (abfd, size)
- bfd *abfd;
- bfd_size_type size;
+void *
+bfd_alloc (bfd *abfd, bfd_size_type size)
{
- PTR ret;
+ void *ret;
if (size != (unsigned long) size)
{
return ret;
}
-PTR
-bfd_zalloc (abfd, size)
- bfd *abfd;
- bfd_size_type size;
+void *
+bfd_zalloc (bfd *abfd, bfd_size_type size)
{
- PTR res;
+ void *res;
res = bfd_alloc (abfd, size);
if (res)
Note: Also frees all more recently allocated blocks! */
void
-bfd_release (abfd, block)
- bfd *abfd;
- PTR block;
+bfd_release (bfd *abfd, void *block)
{
objalloc_free_block ((struct objalloc *) abfd->memory, block);
}
+
+
+/*
+ GNU Extension: separate debug-info files
+
+ The idea here is that a special section called .gnu_debuglink might be
+ embedded in a binary file, which indicates that some *other* file
+ contains the real debugging information. This special section contains a
+ filename and CRC32 checksum, which we read and resolve to another file,
+ if it exists.
+
+ This facilitates "optional" provision of debugging information, without
+ having to provide two complete copies of every binary object (with and
+ without debug symbols).
+*/
+
+#define GNU_DEBUGLINK ".gnu_debuglink"
+/*
+FUNCTION
+ bfd_calc_gnu_debuglink_crc32
+
+SYNOPSIS
+ unsigned long bfd_calc_gnu_debuglink_crc32
+ (unsigned long crc, const unsigned char *buf, bfd_size_type len);
+
+DESCRIPTION
+ Computes a CRC value as used in the .gnu_debuglink section.
+ Advances the previously computed @var{crc} value by computing
+ and adding in the crc32 for @var{len} bytes of @var{buf}.
+
+RETURNS
+ Return the updated CRC32 value.
+*/
+
+unsigned long
+bfd_calc_gnu_debuglink_crc32 (unsigned long crc,
+ const unsigned char *buf,
+ bfd_size_type len)
+{
+ static const unsigned long crc32_table[256] =
+ {
+ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
+ 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
+ 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
+ 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+ 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
+ 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+ 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
+ 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+ 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
+ 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
+ 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
+ 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+ 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
+ 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
+ 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
+ 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+ 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
+ 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+ 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
+ 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+ 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
+ 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
+ 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
+ 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+ 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
+ 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
+ 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
+ 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+ 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
+ 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+ 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
+ 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+ 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
+ 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
+ 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
+ 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+ 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
+ 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
+ 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
+ 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+ 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
+ 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+ 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
+ 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+ 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
+ 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
+ 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
+ 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+ 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
+ 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
+ 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
+ 0x2d02ef8d
+ };
+ const unsigned char *end;
+
+ crc = ~crc & 0xffffffff;
+ for (end = buf + len; buf < end; ++ buf)
+ crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
+ return ~crc & 0xffffffff;;
+}
+
+
+/*
+INTERNAL_FUNCTION
+ get_debug_link_info
+
+SYNOPSIS
+ char *get_debug_link_info (bfd *abfd, unsigned long *crc32_out);
+
+DESCRIPTION
+ fetch the filename and CRC32 value for any separate debuginfo
+ associated with @var{abfd}. Return NULL if no such info found,
+ otherwise return filename and update @var{crc32_out}.
+*/
+
+static char *
+get_debug_link_info (bfd *abfd, unsigned long *crc32_out)
+{
+ asection *sect;
+ unsigned long crc32;
+ bfd_byte *contents;
+ int crc_offset;
+ char *name;
+
+ BFD_ASSERT (abfd);
+ BFD_ASSERT (crc32_out);
+
+ sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
+
+ if (sect == NULL)
+ return NULL;
+
+ if (!bfd_malloc_and_get_section (abfd, sect, &contents))
+ {
+ if (contents != NULL)
+ free (contents);
+ return NULL;
+ }
+
+ /* Crc value is stored after the filename, aligned up to 4 bytes. */
+ name = (char *) contents;
+ crc_offset = strlen (name) + 1;
+ crc_offset = (crc_offset + 3) & ~3;
+
+ crc32 = bfd_get_32 (abfd, contents + crc_offset);
+
+ *crc32_out = crc32;
+ return name;
+}
+
+/*
+INTERNAL_FUNCTION
+ separate_debug_file_exists
+
+SYNOPSIS
+ bfd_boolean separate_debug_file_exists
+ (char *name, unsigned long crc32);
+
+DESCRIPTION
+ Checks to see if @var{name} is a file and if its contents
+ match @var{crc32}.
+*/
+
+static bfd_boolean
+separate_debug_file_exists (const char *name, const unsigned long crc)
+{
+ static unsigned char buffer [8 * 1024];
+ unsigned long file_crc = 0;
+ int fd;
+ bfd_size_type count;
+
+ BFD_ASSERT (name);
+
+ fd = open (name, O_RDONLY);
+ if (fd < 0)
+ return FALSE;
+
+ while ((count = read (fd, buffer, sizeof (buffer))) > 0)
+ file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
+
+ close (fd);
+
+ return crc == file_crc;
+}
+
+
+/*
+INTERNAL_FUNCTION
+ find_separate_debug_file
+
+SYNOPSIS
+ char *find_separate_debug_file (bfd *abfd);
+
+DESCRIPTION
+ Searches @var{abfd} for a reference to separate debugging
+ information, scans various locations in the filesystem, including
+ the file tree rooted at @var{debug_file_directory}, and returns a
+ filename of such debugging information if the file is found and has
+ matching CRC32. Returns NULL if no reference to debugging file
+ exists, or file cannot be found.
+*/
+
+static char *
+find_separate_debug_file (bfd *abfd, const char *debug_file_directory)
+{
+ char *basename;
+ char *dir;
+ char *debugfile;
+ unsigned long crc32;
+ int i;
+
+ BFD_ASSERT (abfd);
+ if (debug_file_directory == NULL)
+ debug_file_directory = ".";
+
+ /* BFD may have been opened from a stream. */
+ if (! abfd->filename)
+ return NULL;
+
+ basename = get_debug_link_info (abfd, & crc32);
+ if (basename == NULL)
+ return NULL;
+
+ if (strlen (basename) < 1)
+ {
+ free (basename);
+ return NULL;
+ }
+
+ dir = strdup (abfd->filename);
+ if (dir == NULL)
+ {
+ free (basename);
+ return NULL;
+ }
+ BFD_ASSERT (strlen (dir) != 0);
+
+ /* Strip off filename part. */
+ for (i = strlen (dir) - 1; i >= 0; i--)
+ if (IS_DIR_SEPARATOR (dir[i]))
+ break;
+
+ dir[i + 1] = '\0';
+ BFD_ASSERT (dir[i] == '/' || dir[0] == '\0');
+
+ debugfile = malloc (strlen (debug_file_directory) + 1
+ + strlen (dir)
+ + strlen (".debug/")
+ + strlen (basename)
+ + 1);
+ if (debugfile == NULL)
+ {
+ free (basename);
+ free (dir);
+ return NULL;
+ }
+
+ /* First try in the same directory as the original file: */
+ strcpy (debugfile, dir);
+ strcat (debugfile, basename);
+
+ if (separate_debug_file_exists (debugfile, crc32))
+ {
+ free (basename);
+ free (dir);
+ return debugfile;
+ }
+
+ /* Then try in a subdirectory called .debug. */
+ strcpy (debugfile, dir);
+ strcat (debugfile, ".debug/");
+ strcat (debugfile, basename);
+
+ if (separate_debug_file_exists (debugfile, crc32))
+ {
+ free (basename);
+ free (dir);
+ return debugfile;
+ }
+
+ /* Then try in the global debugfile directory. */
+ strcpy (debugfile, debug_file_directory);
+ i = strlen (debug_file_directory) - 1;
+ if (i > 0
+ && debug_file_directory[i] != '/'
+ && dir[0] != '/')
+ strcat (debugfile, "/");
+ strcat (debugfile, dir);
+ strcat (debugfile, basename);
+
+ if (separate_debug_file_exists (debugfile, crc32))
+ {
+ free (basename);
+ free (dir);
+ return debugfile;
+ }
+
+ free (debugfile);
+ free (basename);
+ free (dir);
+ return NULL;
+}
+
+
+/*
+FUNCTION
+ bfd_follow_gnu_debuglink
+
+SYNOPSIS
+ char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir);
+
+DESCRIPTION
+
+ Takes a BFD and searches it for a .gnu_debuglink section. If this
+ section is found, it examines the section for the name and checksum
+ of a '.debug' file containing auxiliary debugging information. It
+ then searches the filesystem for this .debug file in some standard
+ locations, including the directory tree rooted at @var{dir}, and if
+ found returns the full filename.
+
+ If @var{dir} is NULL, it will search a default path configured into
+ libbfd at build time. [XXX this feature is not currently
+ implemented].
+
+RETURNS
+ <<NULL>> on any errors or failure to locate the .debug file,
+ otherwise a pointer to a heap-allocated string containing the
+ filename. The caller is responsible for freeing this string.
+*/
+
+char *
+bfd_follow_gnu_debuglink (bfd *abfd, const char *dir)
+{
+ return find_separate_debug_file (abfd, dir);
+}
+
+/*
+FUNCTION
+ bfd_create_gnu_debuglink_section
+
+SYNOPSIS
+ struct bfd_section *bfd_create_gnu_debuglink_section
+ (bfd *abfd, const char *filename);
+
+DESCRIPTION
+
+ Takes a @var{BFD} and adds a .gnu_debuglink section to it. The section is sized
+ to be big enough to contain a link to the specified @var{filename}.
+
+RETURNS
+ A pointer to the new section is returned if all is ok. Otherwise <<NULL>> is
+ returned and bfd_error is set.
+*/
+
+asection *
+bfd_create_gnu_debuglink_section (bfd *abfd, const char *filename)
+{
+ asection *sect;
+ bfd_size_type debuglink_size;
+
+ if (abfd == NULL || filename == NULL)
+ {
+ bfd_set_error (bfd_error_invalid_operation);
+ return NULL;
+ }
+
+ /* Strip off any path components in filename. */
+ filename = lbasename (filename);
+
+ sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
+ if (sect)
+ {
+ /* Section already exists. */
+ bfd_set_error (bfd_error_invalid_operation);
+ return NULL;
+ }
+
+ sect = bfd_make_section (abfd, GNU_DEBUGLINK);
+ if (sect == NULL)
+ return NULL;
+
+ if (! bfd_set_section_flags (abfd, sect,
+ SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING))
+ /* XXX Should we delete the section from the bfd ? */
+ return NULL;
+
+
+ debuglink_size = strlen (filename) + 1;
+ debuglink_size += 3;
+ debuglink_size &= ~3;
+ debuglink_size += 4;
+
+ if (! bfd_set_section_size (abfd, sect, debuglink_size))
+ /* XXX Should we delete the section from the bfd ? */
+ return NULL;
+
+ return sect;
+}
+
+
+/*
+FUNCTION
+ bfd_fill_in_gnu_debuglink_section
+
+SYNOPSIS
+ bfd_boolean bfd_fill_in_gnu_debuglink_section
+ (bfd *abfd, struct bfd_section *sect, const char *filename);
+
+DESCRIPTION
+
+ Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT}
+ and fills in the contents of the section to contain a link to the
+ specified @var{filename}. The filename should be relative to the
+ current directory.
+
+RETURNS
+ <<TRUE>> is returned if all is ok. Otherwise <<FALSE>> is returned
+ and bfd_error is set.
+*/
+
+bfd_boolean
+bfd_fill_in_gnu_debuglink_section (bfd *abfd,
+ struct bfd_section *sect,
+ const char *filename)
+{
+ bfd_size_type debuglink_size;
+ unsigned long crc32;
+ char * contents;
+ bfd_size_type crc_offset;
+ FILE * handle;
+ static unsigned char buffer[8 * 1024];
+ size_t count;
+
+ if (abfd == NULL || sect == NULL || filename == NULL)
+ {
+ bfd_set_error (bfd_error_invalid_operation);
+ return FALSE;
+ }
+
+ /* Make sure that we can read the file.
+ XXX - Should we attempt to locate the debug info file using the same
+ algorithm as gdb ? At the moment, since we are creating the
+ .gnu_debuglink section, we insist upon the user providing us with a
+ correct-for-section-creation-time path, but this need not conform to
+ the gdb location algorithm. */
+ handle = fopen (filename, FOPEN_RB);
+ if (handle == NULL)
+ {
+ bfd_set_error (bfd_error_system_call);
+ return FALSE;
+ }
+
+ crc32 = 0;
+ while ((count = fread (buffer, 1, sizeof buffer, handle)) > 0)
+ crc32 = bfd_calc_gnu_debuglink_crc32 (crc32, buffer, count);
+ fclose (handle);
+
+ /* Strip off any path components in filename,
+ now that we no longer need them. */
+ filename = lbasename (filename);
+
+ debuglink_size = strlen (filename) + 1;
+ debuglink_size += 3;
+ debuglink_size &= ~3;
+ debuglink_size += 4;
+
+ contents = malloc (debuglink_size);
+ if (contents == NULL)
+ {
+ /* XXX Should we delete the section from the bfd ? */
+ bfd_set_error (bfd_error_no_memory);
+ return FALSE;
+ }
+
+ strcpy (contents, filename);
+ crc_offset = debuglink_size - 4;
+
+ bfd_put_32 (abfd, crc32, contents + crc_offset);
+
+ if (! bfd_set_section_contents (abfd, sect, contents, 0, debuglink_size))
+ {
+ /* XXX Should we delete the section from the bfd ? */
+ free (contents);
+ return FALSE;
+ }
+
+ return TRUE;
+}
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