/* opncls.c -- open and close a BFD. Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "bfd.h" #include "objalloc.h" #include "libbfd.h" #include "libiberty.h" #ifndef S_IXUSR #define S_IXUSR 0100 /* Execute by owner. */ #endif #ifndef S_IXGRP #define S_IXGRP 0010 /* Execute by group. */ #endif #ifndef S_IXOTH #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 (void) { bfd *nbfd; nbfd = (bfd *) bfd_zmalloc (sizeof (bfd)); if (nbfd == NULL) return NULL; nbfd->id = _bfd_id_counter++; nbfd->memory = objalloc_create (); if (nbfd->memory == NULL) { bfd_set_error (bfd_error_no_memory); free (nbfd); return NULL; } nbfd->arch_info = &bfd_default_arch_struct; nbfd->direction = no_direction; nbfd->iostream = NULL; nbfd->where = 0; if (!bfd_hash_table_init_n (& nbfd->section_htab, bfd_section_hash_newfunc, sizeof (struct section_hash_entry), 251)) { free (nbfd); return NULL; } nbfd->sections = NULL; nbfd->section_last = NULL; nbfd->format = bfd_unknown; nbfd->my_archive = NULL; nbfd->origin = 0; nbfd->opened_once = FALSE; nbfd->output_has_begun = FALSE; nbfd->section_count = 0; nbfd->usrdata = NULL; nbfd->cacheable = FALSE; nbfd->flags = BFD_NO_FLAGS; nbfd->mtime_set = FALSE; return nbfd; } /* Allocate a new BFD as a member of archive OBFD. */ bfd * _bfd_new_bfd_contained_in (bfd *obfd) { bfd *nbfd; nbfd = _bfd_new_bfd (); 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; return nbfd; } /* Delete a BFD. */ void _bfd_delete_bfd (bfd *abfd) { if (abfd->memory) { bfd_hash_table_free (&abfd->section_htab); objalloc_free ((struct objalloc *) abfd->memory); } free (abfd); } /* Free objalloc memory. */ bfd_boolean _bfd_free_cached_info (bfd *abfd) { if (abfd->memory) { bfd_hash_table_free (&abfd->section_htab); objalloc_free ((struct objalloc *) abfd->memory); abfd->sections = NULL; abfd->section_last = NULL; abfd->outsymbols = NULL; abfd->tdata.any = NULL; abfd->usrdata = NULL; abfd->memory = NULL; } return TRUE; } /* SECTION Opening and closing BFDs SUBSECTION Functions for opening and closing */ /* FUNCTION bfd_fopen SYNOPSIS bfd *bfd_fopen (const char *filename, const char *target, const char *mode, int fd); DESCRIPTION Open the file @var{filename} with the target @var{target}. Return a pointer to the created BFD. If @var{fd} is not -1, then <> is used to open the file; otherwise, <> is used. @var{mode} is passed directly to <> or <>. Calls <>, so @var{target} is interpreted as by that function. The new BFD is marked as cacheable iff @var{fd} is -1. If <> is returned then an error has occured. Possible errors are <>, <> or <> error. */ bfd * bfd_fopen (const char *filename, const char *target, const char *mode, int fd) { bfd *nbfd; const bfd_target *target_vec; 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; } #ifdef HAVE_FDOPEN if (fd != -1) nbfd->iostream = fdopen (fd, mode); else #endif nbfd->iostream = real_fopen (filename, mode); if (nbfd->iostream == NULL) { bfd_set_error (bfd_error_system_call); _bfd_delete_bfd (nbfd); return NULL; } /* OK, put everything where it belongs. */ nbfd->filename = filename; /* Figure out whether the user is opening the file for reading, writing, or both, by looking at the MODE argument. */ if ((mode[0] == 'r' || mode[0] == 'w' || mode[0] == 'a') && mode[1] == '+') nbfd->direction = both_direction; else if (mode[0] == 'r') nbfd->direction = read_direction; else nbfd->direction = write_direction; if (! bfd_cache_init (nbfd)) { _bfd_delete_bfd (nbfd); return NULL; } nbfd->opened_once = TRUE; /* If we opened the file by name, mark it cacheable; we can close it and reopen it later. However, if a file descriptor was provided, then it may have been opened with special flags that make it unsafe to close and reopen the file. */ if (fd == -1) bfd_set_cacheable (nbfd, TRUE); return nbfd; } /* FUNCTION bfd_openr SYNOPSIS bfd *bfd_openr (const char *filename, const char *target); DESCRIPTION Open the file @var{filename} (using <>) with the target @var{target}. Return a pointer to the created BFD. Calls <>, so @var{target} is interpreted as by that function. If <> is returned then an error has occured. Possible errors are <>, <> or <> error. */ bfd * bfd_openr (const char *filename, const char *target) { return bfd_fopen (filename, target, FOPEN_RB, -1); } /* Don't try to `optimize' this function: o - We lock using stack space so that interrupting the locking won't cause a storage leak. o - We open the file stream last, since we don't want to have to close it if anything goes wrong. Closing the stream means closing the file descriptor too, even though we didn't open it. */ /* FUNCTION bfd_fdopenr SYNOPSIS bfd *bfd_fdopenr (const char *filename, const char *target, int fd); DESCRIPTION <> is to <> much like <> is to <>. It opens a BFD on a file already described by the @var{fd} supplied. When the file is later <>d, the file descriptor will be closed. If the caller desires that this file descriptor be cached by BFD (opened as needed, closed as needed to free 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 caching; the file descriptor will remain open until <>, and will not be affected by BFD operations on other files. Possible errors are <>, <> and <>. */ bfd * bfd_fdopenr (const char *filename, const char *target, int fd) { const char *mode; #if defined(HAVE_FCNTL) && defined(F_GETFL) int fdflags; #endif #if ! defined(HAVE_FCNTL) || ! defined(F_GETFL) mode = FOPEN_RUB; /* Assume full access. */ #else fdflags = fcntl (fd, F_GETFL, NULL); if (fdflags == -1) { bfd_set_error (bfd_error_system_call); return NULL; } /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ switch (fdflags & (O_ACCMODE)) { case O_RDONLY: mode = FOPEN_RB; break; case O_WRONLY: mode = FOPEN_RUB; break; case O_RDWR: mode = FOPEN_RUB; break; default: abort (); } #endif return bfd_fopen (filename, target, mode, fd); } /* FUNCTION bfd_openstreamr SYNOPSIS bfd *bfd_openstreamr (const char *, const char *, void *); DESCRIPTION Open a BFD for read access on an existing stdio stream. When the BFD is passed to <>, the stream will be closed. */ bfd * bfd_openstreamr (const char *filename, const char *target, void *streamarg) { FILE *stream = (FILE *) streamarg; bfd *nbfd; const bfd_target *target_vec; 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->iostream = stream; nbfd->filename = filename; nbfd->direction = read_direction; if (! bfd_cache_init (nbfd)) { _bfd_delete_bfd (nbfd); return NULL; } 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), int (*stat) (struct bfd *abfd, void *stream, struct stat *sb)); 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 <>, so @var{target} is interpreted as by that function. Calls @var{open} (which can call <> and <>) to obtain the read-only stream backing the BFD. @var{open} either succeeds returning the non-<> @var{stream}, or fails returning <> (setting <>). Calls @var{pread} to request @var{nbytes} of data from @var{stream} starting at @var{offset} (e.g., via a call to <>). @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 <>). Calls @var{close} when the BFD is later closed using <>. @var{close} either succeeds returning 0, or fails returning -1 (setting <>). Calls @var{stat} to fill in a stat structure for bfd_stat, bfd_get_size, and bfd_get_mtime calls. @var{stat} returns 0 on success, or returns -1 on failure (setting <>). If <> returns <> then an error has occurred. Possible errors are <>, <> and <>. */ 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); int (*stat) (struct bfd *abfd, void *stream, struct stat *sb); file_ptr where; }; static file_ptr opncls_btell (struct bfd *abfd) { struct opncls *vec = (struct opncls *) abfd->iostream; return vec->where; } static int opncls_bseek (struct bfd *abfd, file_ptr offset, int whence) { struct opncls *vec = (struct opncls *) 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 = (struct opncls *) 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 = (struct opncls *) 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, struct stat *sb) { struct opncls *vec = (struct opncls *) abfd->iostream; memset (sb, 0, sizeof (*sb)); if (vec->stat == NULL) return 0; return (vec->stat) (abfd, vec->stream, sb); } static void * opncls_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED, void *addr ATTRIBUTE_UNUSED, bfd_size_type len ATTRIBUTE_UNUSED, int prot ATTRIBUTE_UNUSED, int flags ATTRIBUTE_UNUSED, file_ptr offset ATTRIBUTE_UNUSED) { return (void *) -1; } static const struct bfd_iovec opncls_iovec = { &opncls_bread, &opncls_bwrite, &opncls_btell, &opncls_bseek, &opncls_bclose, &opncls_bflush, &opncls_bstat, &opncls_bmmap }; bfd * bfd_openr_iovec (const char *filename, const char *target, void *(*_open) (struct bfd *, void *), void *open_closure, file_ptr (*_pread) (struct bfd *, void *, void *, file_ptr, file_ptr), int (*_close) (struct bfd *, void *), int (*_stat) (struct bfd *, void *, struct stat *)) { 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; /* `open (...)' would get expanded by an the open(2) syscall macro. */ stream = (*_open) (nbfd, open_closure); if (stream == NULL) { _bfd_delete_bfd (nbfd); return NULL; } vec = (struct opncls *) bfd_zalloc (nbfd, sizeof (struct opncls)); vec->stream = stream; vec->pread = _pread; vec->close = _close; vec->stat = _stat; nbfd->iovec = &opncls_iovec; nbfd->iostream = vec; return nbfd; } /* bfd_openw -- open for writing. Returns a pointer to a freshly-allocated BFD on success, or NULL. See comment by bfd_fdopenr before you try to modify this function. */ /* FUNCTION bfd_openw SYNOPSIS bfd *bfd_openw (const char *filename, const char *target); DESCRIPTION Create a BFD, associated with file @var{filename}, using the file format @var{target}, and return a pointer to it. Possible errors are <>, <>, <>. */ bfd * bfd_openw (const char *filename, const char *target) { bfd *nbfd; const bfd_target *target_vec; /* nbfd has to point to head of malloc'ed block so that bfd_close may reclaim it correctly. */ 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 = write_direction; if (bfd_open_file (nbfd) == NULL) { /* File not writeable, etc. */ bfd_set_error (bfd_error_system_call); _bfd_delete_bfd (nbfd); return NULL; } return nbfd; } static inline void _maybe_make_executable (bfd * abfd) { /* If the file was open for writing and is now executable, make it so. */ if (abfd->direction == write_direction && (abfd->flags & (EXEC_P | DYNAMIC)) != 0) { struct stat buf; if (stat (abfd->filename, &buf) == 0 /* Do not attempt to change non-regular files. This is here especially for configure scripts and kernel builds which run tests with "ld [...] -o /dev/null". */ && S_ISREG(buf.st_mode)) { unsigned int mask = umask (0); umask (mask); chmod (abfd->filename, (0777 & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask)))); } } } /* FUNCTION bfd_close SYNOPSIS bfd_boolean bfd_close (bfd *abfd); DESCRIPTION Close a BFD. If the BFD was open for writing, then pending operations are completed and the file written out and closed. If the created file is executable, then <> is called to mark it as such. All memory attached to the BFD is released. The file descriptor associated with the BFD is closed (even if it was passed in to BFD by <>). RETURNS <> is returned if all is ok, otherwise <>. */ bfd_boolean bfd_close (bfd *abfd) { bfd_boolean ret; bfd *nbfd; bfd *next; if (bfd_write_p (abfd)) { if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) return FALSE; } /* Close nested archives (if this bfd is a thin archive). */ for (nbfd = abfd->nested_archives; nbfd; nbfd = next) { next = nbfd->archive_next; bfd_close (nbfd); } if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) return FALSE; if ((abfd->flags & BFD_IN_MEMORY) != 0) { /* FIXME: cagney/2004-02-15: Need to implement a BFD_IN_MEMORY io vector. Until that's done, at least don't leak memory. */ struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; if (bim->buffer != NULL) free (bim->buffer); free (bim); ret = TRUE; } else ret = abfd->iovec->bclose (abfd); if (ret) _maybe_make_executable (abfd); _bfd_delete_bfd (abfd); return ret; } /* FUNCTION bfd_close_all_done SYNOPSIS bfd_boolean bfd_close_all_done (bfd *); DESCRIPTION Close a BFD. Differs from <> since it does not complete any pending operations. This routine would be used if the application had just used BFD for swapping and didn't want to use any of the writing code. If the created file is executable, then <> is called to mark it as such. All memory attached to the BFD is released. RETURNS <> is returned if all is ok, otherwise <>. */ bfd_boolean bfd_close_all_done (bfd *abfd) { bfd_boolean ret; ret = bfd_cache_close (abfd); if (ret) _maybe_make_executable (abfd); _bfd_delete_bfd (abfd); return ret; } /* FUNCTION bfd_create SYNOPSIS bfd *bfd_create (const char *filename, bfd *templ); DESCRIPTION Create a new BFD in the manner of <>, but without opening a file. The new BFD takes the target from the target used by @var{template}. The format is always set to <>. */ bfd * bfd_create (const char *filename, bfd *templ) { bfd *nbfd; nbfd = _bfd_new_bfd (); if (nbfd == NULL) return NULL; nbfd->filename = filename; if (templ) nbfd->xvec = templ->xvec; nbfd->direction = no_direction; bfd_set_format (nbfd, bfd_object); return nbfd; } /* FUNCTION bfd_make_writable SYNOPSIS bfd_boolean bfd_make_writable (bfd *abfd); DESCRIPTION Takes a BFD as created by <> and converts it into one like as returned by <>. It does this by converting the BFD to BFD_IN_MEMORY. It's assumed that you will call <> on this bfd later. RETURNS <> is returned if all is ok, otherwise <>. */ bfd_boolean bfd_make_writable (bfd *abfd) { struct bfd_in_memory *bim; if (abfd->direction != no_direction) { bfd_set_error (bfd_error_invalid_operation); return FALSE; } bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory)); if (bim == NULL) return FALSE; /* bfd_error already set. */ abfd->iostream = bim; /* bfd_bwrite will grow these as needed. */ bim->size = 0; bim->buffer = 0; abfd->flags |= BFD_IN_MEMORY; abfd->direction = write_direction; abfd->where = 0; return TRUE; } /* FUNCTION bfd_make_readable SYNOPSIS bfd_boolean bfd_make_readable (bfd *abfd); DESCRIPTION Takes a BFD as created by <> and <> and converts it into one like as returned by <>. It does this by writing the contents out to the memory buffer, then reversing the direction. RETURNS <> is returned if all is ok, otherwise <>. */ bfd_boolean bfd_make_readable (bfd *abfd) { if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY)) { bfd_set_error (bfd_error_invalid_operation); return FALSE; } if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) return FALSE; if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) return FALSE; abfd->arch_info = &bfd_default_arch_struct; abfd->where = 0; abfd->format = bfd_unknown; abfd->my_archive = NULL; abfd->origin = 0; abfd->opened_once = FALSE; abfd->output_has_begun = FALSE; abfd->section_count = 0; abfd->usrdata = NULL; abfd->cacheable = FALSE; abfd->flags = BFD_IN_MEMORY; abfd->mtime_set = FALSE; abfd->target_defaulted = TRUE; abfd->direction = read_direction; abfd->sections = 0; abfd->symcount = 0; abfd->outsymbols = 0; abfd->tdata.any = 0; bfd_section_list_clear (abfd); bfd_check_format (abfd, bfd_object); return TRUE; } /* INTERNAL_FUNCTION bfd_alloc SYNOPSIS void *bfd_alloc (bfd *abfd, bfd_size_type wanted); DESCRIPTION Allocate a block of @var{wanted} bytes of memory attached to <> and return a pointer to it. */ void * bfd_alloc (bfd *abfd, bfd_size_type size) { void *ret; if (size != (unsigned long) size) { bfd_set_error (bfd_error_no_memory); return NULL; } ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size); if (ret == NULL) bfd_set_error (bfd_error_no_memory); return ret; } /* INTERNAL_FUNCTION bfd_alloc2 SYNOPSIS void *bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size); DESCRIPTION Allocate a block of @var{nmemb} elements of @var{size} bytes each of memory attached to <> and return a pointer to it. */ void * bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size) { void *ret; if ((nmemb | size) >= HALF_BFD_SIZE_TYPE && size != 0 && nmemb > ~(bfd_size_type) 0 / size) { bfd_set_error (bfd_error_no_memory); return NULL; } size *= nmemb; if (size != (unsigned long) size) { bfd_set_error (bfd_error_no_memory); return NULL; } ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size); if (ret == NULL) bfd_set_error (bfd_error_no_memory); return ret; } /* INTERNAL_FUNCTION bfd_zalloc SYNOPSIS void *bfd_zalloc (bfd *abfd, bfd_size_type wanted); DESCRIPTION Allocate a block of @var{wanted} bytes of zeroed memory attached to <> and return a pointer to it. */ void * bfd_zalloc (bfd *abfd, bfd_size_type size) { void *res; res = bfd_alloc (abfd, size); if (res) memset (res, 0, (size_t) size); return res; } /* INTERNAL_FUNCTION bfd_zalloc2 SYNOPSIS void *bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size); DESCRIPTION Allocate a block of @var{nmemb} elements of @var{size} bytes each of zeroed memory attached to <> and return a pointer to it. */ void * bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size) { void *res; if ((nmemb | size) >= HALF_BFD_SIZE_TYPE && size != 0 && nmemb > ~(bfd_size_type) 0 / size) { bfd_set_error (bfd_error_no_memory); return NULL; } size *= nmemb; res = bfd_alloc (abfd, size); if (res) memset (res, 0, (size_t) size); return res; } /* Free a block allocated for a BFD. Note: Also frees all more recently allocated blocks! */ void 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; FILE *f; bfd_size_type count; BFD_ASSERT (name); f = real_fopen (name, FOPEN_RB); if (f == NULL) return FALSE; while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0) file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count); fclose (f); 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 *base; char *dir; char *debugfile; char *canon_dir; unsigned long crc32; size_t dirlen; size_t canon_dirlen; BFD_ASSERT (abfd); if (debug_file_directory == NULL) debug_file_directory = "."; /* BFD may have been opened from a stream. */ if (abfd->filename == NULL) { bfd_set_error (bfd_error_invalid_operation); return NULL; } base = get_debug_link_info (abfd, & crc32); if (base == NULL) return NULL; if (base[0] == '\0') { free (base); bfd_set_error (bfd_error_no_debug_section); return NULL; } for (dirlen = strlen (abfd->filename); dirlen > 0; dirlen--) if (IS_DIR_SEPARATOR (abfd->filename[dirlen - 1])) break; dir = (char *) bfd_malloc (dirlen + 1); if (dir == NULL) { free (base); return NULL; } memcpy (dir, abfd->filename, dirlen); dir[dirlen] = '\0'; /* Compute the canonical name of the bfd object with all symbolic links resolved, for use in the global debugfile directory. */ canon_dir = lrealpath (abfd->filename); for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--) if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1])) break; canon_dir[canon_dirlen] = '\0'; debugfile = (char *) bfd_malloc (strlen (debug_file_directory) + 1 + (canon_dirlen > dirlen ? canon_dirlen : dirlen) + strlen (".debug/") + strlen (base) + 1); if (debugfile == NULL) { free (base); free (dir); free (canon_dir); return NULL; } /* First try in the same directory as the original file: */ strcpy (debugfile, dir); strcat (debugfile, base); if (separate_debug_file_exists (debugfile, crc32)) { free (base); free (dir); free (canon_dir); return debugfile; } /* Then try in a subdirectory called .debug. */ strcpy (debugfile, dir); strcat (debugfile, ".debug/"); strcat (debugfile, base); if (separate_debug_file_exists (debugfile, crc32)) { free (base); free (dir); free (canon_dir); return debugfile; } /* Then try in the global debugfile directory. */ strcpy (debugfile, debug_file_directory); dirlen = strlen (debug_file_directory) - 1; if (dirlen > 0 && debug_file_directory[dirlen] != '/' && canon_dir[0] != '/') strcat (debugfile, "/"); strcat (debugfile, canon_dir); strcat (debugfile, base); if (separate_debug_file_exists (debugfile, crc32)) { free (base); free (dir); free (canon_dir); return debugfile; } free (debugfile); free (base); free (dir); free (canon_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 <> 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 <> 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; flagword flags; 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; } flags = SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING; sect = bfd_make_section_with_flags (abfd, GNU_DEBUGLINK, flags); if (sect == NULL) 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 <> is returned if all is ok. Otherwise <> 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; size_t filelen; 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 = real_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); filelen = strlen (filename); debuglink_size = filelen + 1; debuglink_size += 3; debuglink_size &= ~3; debuglink_size += 4; contents = (char *) bfd_malloc (debuglink_size); if (contents == NULL) { /* XXX Should we delete the section from the bfd ? */ return FALSE; } crc_offset = debuglink_size - 4; memcpy (contents, filename, filelen); memset (contents + filelen, 0, crc_offset - filelen); 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; }