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Diffstat (limited to 'contrib/binutils/bfd/opncls.c')
| -rw-r--r-- | contrib/binutils/bfd/opncls.c | 1175 |
1 files changed, 1175 insertions, 0 deletions
diff --git a/contrib/binutils/bfd/opncls.c b/contrib/binutils/bfd/opncls.c new file mode 100644 index 0000000..6abd405 --- /dev/null +++ b/contrib/binutils/bfd/opncls.c @@ -0,0 +1,1175 @@ +/* opncls.c -- open and close a BFD. + Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, + 2001, 2002, 2003 + Free Software Foundation, Inc. + + Written by Cygnus Support. + + This file is part of BFD, the Binary File Descriptor library. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "bfd.h" +#include "sysdep.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_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, + 251)) + { + free (nbfd); + return NULL; + } + nbfd->sections = NULL; + nbfd->section_tail = &nbfd->sections; + 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->my_archive = obfd; + nbfd->direction = read_direction; + nbfd->target_defaulted = obfd->target_defaulted; + return nbfd; +} + +/* Delete a BFD. */ + +void +_bfd_delete_bfd (bfd *abfd) +{ + bfd_hash_table_free (&abfd->section_htab); + objalloc_free ((struct objalloc *) abfd->memory); + free (abfd); +} + +/* +SECTION + Opening and closing BFDs + +*/ + +/* +FUNCTION + bfd_openr + +SYNOPSIS + bfd *bfd_openr (const char *filename, const char *target); + +DESCRIPTION + Open the file @var{filename} (using <<fopen>>) with the target + @var{target}. Return a pointer to the created BFD. + + Calls <<bfd_find_target>>, so @var{target} is interpreted as by + that function. + + If <<NULL>> is returned then an error has occured. Possible errors + are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or + <<system_call>> error. +*/ + +bfd * +bfd_openr (const char *filename, const char *target) +{ + 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->filename = filename; + nbfd->direction = read_direction; + + if (bfd_open_file (nbfd) == NULL) + { + /* File didn't exist, or some such. */ + bfd_set_error (bfd_error_system_call); + _bfd_delete_bfd (nbfd); + return NULL; + } + + return nbfd; +} + +/* 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 + <<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to + <<fopen>>. It opens a BFD on a file already described by the + @var{fd} supplied. + + When the file is later <<bfd_close>>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 <<bfd_close>>, and will not be affected by BFD operations + on other files. + + Possible errors are <<bfd_error_no_memory>>, + <<bfd_error_invalid_target>> and <<bfd_error_system_call>>. +*/ + +bfd * +bfd_fdopenr (const char *filename, const char *target, int fd) +{ + bfd *nbfd; + const bfd_target *target_vec; + int fdflags; + + bfd_set_error (bfd_error_system_call); +#if ! defined(HAVE_FCNTL) || ! defined(F_GETFL) + fdflags = O_RDWR; /* Assume full access. */ +#else + fdflags = fcntl (fd, F_GETFL, NULL); +#endif + if (fdflags == -1) + return NULL; + + 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; + } + +#ifndef HAVE_FDOPEN + 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 = 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 + + if (nbfd->iostream == NULL) + { + _bfd_delete_bfd (nbfd); + return NULL; + } + + /* OK, put everything where it belongs. */ + nbfd->filename = filename; + + /* As a special case we allow a FD open for read/write to + be written through, although doing so requires that we end + the previous clause with a preposition. */ + /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ + switch (fdflags & (O_ACCMODE)) + { + case O_RDONLY: nbfd->direction = read_direction; break; + case O_WRONLY: nbfd->direction = write_direction; break; + case O_RDWR: nbfd->direction = both_direction; break; + default: abort (); + } + + if (! bfd_cache_init (nbfd)) + { + _bfd_delete_bfd (nbfd); + return NULL; + } + nbfd->opened_once = TRUE; + + return nbfd; +} + +/* +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 <<bfd_close>>, the stream will be closed. +*/ + +bfd * +bfd_openstreamr (const char *filename, const char *target, void *streamarg) +{ + FILE *stream = 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; +} + +/* 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_error_system_call>>, <<bfd_error_no_memory>>, + <<bfd_error_invalid_target>>. +*/ + +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; +} + +/* + +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 <<chmod>> 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 <<bfd_fdopenr>>). + +RETURNS + <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. +*/ + + +bfd_boolean +bfd_close (bfd *abfd) +{ + bfd_boolean ret; + + if (bfd_write_p (abfd)) + { + if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) + return FALSE; + } + + if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) + return FALSE; + + ret = bfd_cache_close (abfd); + + /* If the file was open for writing and is now executable, + make it so. */ + if (ret + && abfd->direction == write_direction + && abfd->flags & EXEC_P) + { + struct stat buf; + + if (stat (abfd->filename, &buf) == 0) + { + unsigned int mask = umask (0); + + umask (mask); + chmod (abfd->filename, + (0777 + & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask)))); + } + } + + _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 <<bfd_close>> 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 <<chmod>> is called + to mark it as such. + + All memory attached to the BFD is released. + +RETURNS + <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. +*/ + +bfd_boolean +bfd_close_all_done (bfd *abfd) +{ + bfd_boolean ret; + + ret = bfd_cache_close (abfd); + + /* If the file was open for writing and is now executable, + make it so. */ + if (ret + && abfd->direction == write_direction + && abfd->flags & EXEC_P) + { + struct stat buf; + + if (stat (abfd->filename, &buf) == 0) + { + unsigned int mask = umask (0); + + umask (mask); + chmod (abfd->filename, + (0777 + & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask)))); + } + } + + _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 <<bfd_openw>>, 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_object>>. +*/ + +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 <<bfd_create>> and converts it + into one like as returned by <<bfd_openw>>. It does this + by converting the BFD to BFD_IN_MEMORY. It's assumed that + you will call <<bfd_make_readable>> on this bfd later. + +RETURNS + <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. +*/ + +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 = bfd_malloc (sizeof (struct bfd_in_memory)); + 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 <<bfd_create>> and + <<bfd_make_writable>> and converts it into one like as + returned by <<bfd_openr>>. It does this by writing the + contents out to the memory buffer, then reversing the + direction. + +RETURNS + <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. */ + +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, size_t wanted); + +DESCRIPTION + Allocate a block of @var{wanted} bytes of memory attached to + <<abfd>> 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 (abfd->memory, (unsigned long) size); + if (ret == NULL) + bfd_set_error (bfd_error_no_memory); + return ret; +} + +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; +} + +/* 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; + bfd_size_type debuglink_size; + unsigned long crc32; + char * contents; + int crc_offset; + bfd_boolean ret; + + BFD_ASSERT (abfd); + BFD_ASSERT (crc32_out); + + sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK); + + if (sect == NULL) + return NULL; + + debuglink_size = bfd_section_size (abfd, sect); + + contents = malloc (debuglink_size); + if (contents == NULL) + return NULL; + + ret = bfd_get_section_contents (abfd, sect, contents, 0, debuglink_size); + if (! ret) + { + free (contents); + return NULL; + } + + /* Crc value is stored after the filename, aligned up to 4 bytes. */ + crc_offset = strlen (contents) + 1; + crc_offset = (crc_offset + 3) & ~3; + + crc32 = bfd_get_32 (abfd, contents + crc_offset); + + *crc32_out = crc32; + return contents; +} + +/* +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 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) +{ +#if 0 /* Disabled until DEBUGDIR can be defined by configure.in. */ + if (dir == NULL) + dir = DEBUGDIR; +#endif + 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 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; +} |
