| /* opncls.c -- open and close a BFD. |
| Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, |
| 2001, 2002, 2003, 2004, 2005 |
| 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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_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) |
| { |
| 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; |
| } |
| |
| /* |
| 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; |
| } |
| |
| /* 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; |
| |
| /* 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. */ |
| 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, bfd_size_type 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; |
| } |
| |
| /* |
| 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 <<abfd>> 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; |
| } |
| |
| /* 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; |
| 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; |
| } |