1028 lines
24 KiB
C
1028 lines
24 KiB
C
/* Definitions for BFD wrappers used by GDB.
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Copyright (C) 2011-2016 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdb_bfd.h"
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#include "ui-out.h"
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#include "gdbcmd.h"
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#include "hashtab.h"
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#include "filestuff.h"
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#include "vec.h"
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#ifdef HAVE_MMAP
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#include <sys/mman.h>
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *) -1)
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#endif
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#endif
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#include "target.h"
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#include "gdb/fileio.h"
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#include "inferior.h"
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typedef bfd *bfdp;
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DEF_VEC_P (bfdp);
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/* An object of this type is stored in the section's user data when
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mapping a section. */
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struct gdb_bfd_section_data
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{
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/* Size of the data. */
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bfd_size_type size;
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/* If the data was mmapped, this is the length of the map. */
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bfd_size_type map_len;
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/* The data. If NULL, the section data has not been read. */
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void *data;
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/* If the data was mmapped, this is the map address. */
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void *map_addr;
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};
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/* A hash table holding every BFD that gdb knows about. This is not
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to be confused with 'gdb_bfd_cache', which is used for sharing
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BFDs; in contrast, this hash is used just to implement
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"maint info bfd". */
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static htab_t all_bfds;
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/* An object of this type is stored in each BFD's user data. */
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struct gdb_bfd_data
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{
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/* The reference count. */
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int refc;
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/* The mtime of the BFD at the point the cache entry was made. */
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time_t mtime;
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/* The file size (in bytes) at the point the cache entry was made. */
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off_t size;
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/* The inode of the file at the point the cache entry was made. */
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ino_t inode;
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/* The device id of the file at the point the cache entry was made. */
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dev_t device_id;
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/* This is true if we have determined whether this BFD has any
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sections requiring relocation. */
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unsigned int relocation_computed : 1;
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/* This is true if any section needs relocation. */
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unsigned int needs_relocations : 1;
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/* This is true if we have successfully computed the file's CRC. */
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unsigned int crc_computed : 1;
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/* The file's CRC. */
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unsigned long crc;
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/* If the BFD comes from an archive, this points to the archive's
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BFD. Otherwise, this is NULL. */
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bfd *archive_bfd;
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/* Table of all the bfds this bfd has included. */
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VEC (bfdp) *included_bfds;
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/* The registry. */
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REGISTRY_FIELDS;
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};
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#define GDB_BFD_DATA_ACCESSOR(ABFD) \
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((struct gdb_bfd_data *) bfd_usrdata (ABFD))
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DEFINE_REGISTRY (bfd, GDB_BFD_DATA_ACCESSOR)
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/* A hash table storing all the BFDs maintained in the cache. */
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static htab_t gdb_bfd_cache;
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/* When true gdb will reuse an existing bfd object if the filename,
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modification time, and file size all match. */
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static int bfd_sharing = 1;
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static void
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show_bfd_sharing (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("BFD sharing is %s.\n"), value);
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}
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/* When non-zero debugging of the bfd caches is enabled. */
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static unsigned int debug_bfd_cache;
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static void
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show_bfd_cache_debug (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("BFD cache debugging is %s.\n"), value);
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}
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/* The type of an object being looked up in gdb_bfd_cache. We use
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htab's capability of storing one kind of object (BFD in this case)
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and using a different sort of object for searching. */
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struct gdb_bfd_cache_search
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{
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/* The filename. */
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const char *filename;
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/* The mtime. */
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time_t mtime;
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/* The file size (in bytes). */
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off_t size;
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/* The inode of the file. */
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ino_t inode;
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/* The device id of the file. */
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dev_t device_id;
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};
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/* A hash function for BFDs. */
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static hashval_t
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hash_bfd (const void *b)
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{
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const bfd *abfd = (const struct bfd *) b;
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/* It is simplest to just hash the filename. */
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return htab_hash_string (bfd_get_filename (abfd));
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}
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/* An equality function for BFDs. Note that this expects the caller
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to search using struct gdb_bfd_cache_search only, not BFDs. */
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static int
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eq_bfd (const void *a, const void *b)
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{
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const bfd *abfd = (const struct bfd *) a;
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const struct gdb_bfd_cache_search *s
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= (const struct gdb_bfd_cache_search *) b;
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struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
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return (gdata->mtime == s->mtime
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&& gdata->size == s->size
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&& gdata->inode == s->inode
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&& gdata->device_id == s->device_id
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&& strcmp (bfd_get_filename (abfd), s->filename) == 0);
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}
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/* See gdb_bfd.h. */
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int
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is_target_filename (const char *name)
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{
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return startswith (name, TARGET_SYSROOT_PREFIX);
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}
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/* See gdb_bfd.h. */
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int
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gdb_bfd_has_target_filename (struct bfd *abfd)
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{
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return is_target_filename (bfd_get_filename (abfd));
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}
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/* Return the system error number corresponding to ERRNUM. */
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static int
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fileio_errno_to_host (int errnum)
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{
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switch (errnum)
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{
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case FILEIO_EPERM:
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return EPERM;
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case FILEIO_ENOENT:
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return ENOENT;
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case FILEIO_EINTR:
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return EINTR;
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case FILEIO_EIO:
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return EIO;
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case FILEIO_EBADF:
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return EBADF;
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case FILEIO_EACCES:
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return EACCES;
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case FILEIO_EFAULT:
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return EFAULT;
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case FILEIO_EBUSY:
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return EBUSY;
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case FILEIO_EEXIST:
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return EEXIST;
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case FILEIO_ENODEV:
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return ENODEV;
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case FILEIO_ENOTDIR:
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return ENOTDIR;
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case FILEIO_EISDIR:
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return EISDIR;
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case FILEIO_EINVAL:
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return EINVAL;
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case FILEIO_ENFILE:
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return ENFILE;
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case FILEIO_EMFILE:
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return EMFILE;
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case FILEIO_EFBIG:
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return EFBIG;
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case FILEIO_ENOSPC:
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return ENOSPC;
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case FILEIO_ESPIPE:
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return ESPIPE;
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case FILEIO_EROFS:
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return EROFS;
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case FILEIO_ENOSYS:
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return ENOSYS;
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case FILEIO_ENAMETOOLONG:
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return ENAMETOOLONG;
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}
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return -1;
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}
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/* Wrapper for target_fileio_open suitable for passing as the
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OPEN_FUNC argument to gdb_bfd_openr_iovec. The supplied
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OPEN_CLOSURE is unused. */
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static void *
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gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *inferior)
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{
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const char *filename = bfd_get_filename (abfd);
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int fd, target_errno;
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int *stream;
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gdb_assert (is_target_filename (filename));
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fd = target_fileio_open_warn_if_slow ((struct inferior *) inferior,
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filename
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+ strlen (TARGET_SYSROOT_PREFIX),
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FILEIO_O_RDONLY, 0,
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&target_errno);
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if (fd == -1)
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{
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errno = fileio_errno_to_host (target_errno);
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bfd_set_error (bfd_error_system_call);
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return NULL;
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}
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stream = XCNEW (int);
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*stream = fd;
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return stream;
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}
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/* Wrapper for target_fileio_pread suitable for passing as the
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PREAD_FUNC argument to gdb_bfd_openr_iovec. */
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static file_ptr
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gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf,
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file_ptr nbytes, file_ptr offset)
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{
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int fd = *(int *) stream;
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int target_errno;
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file_ptr pos, bytes;
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pos = 0;
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while (nbytes > pos)
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{
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QUIT;
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bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos,
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nbytes - pos, offset + pos,
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&target_errno);
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if (bytes == 0)
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/* Success, but no bytes, means end-of-file. */
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break;
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if (bytes == -1)
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{
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errno = fileio_errno_to_host (target_errno);
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bfd_set_error (bfd_error_system_call);
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return -1;
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}
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pos += bytes;
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}
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return pos;
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}
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/* Wrapper for target_fileio_close suitable for passing as the
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CLOSE_FUNC argument to gdb_bfd_openr_iovec. */
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static int
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gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream)
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{
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int fd = *(int *) stream;
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int target_errno;
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xfree (stream);
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/* Ignore errors on close. These may happen with remote
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targets if the connection has already been torn down. */
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target_fileio_close (fd, &target_errno);
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/* Zero means success. */
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return 0;
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}
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/* Wrapper for target_fileio_fstat suitable for passing as the
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STAT_FUNC argument to gdb_bfd_openr_iovec. */
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static int
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gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream,
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struct stat *sb)
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{
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int fd = *(int *) stream;
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int target_errno;
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int result;
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result = target_fileio_fstat (fd, sb, &target_errno);
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if (result == -1)
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{
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errno = fileio_errno_to_host (target_errno);
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bfd_set_error (bfd_error_system_call);
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}
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return result;
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}
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/* See gdb_bfd.h. */
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struct bfd *
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gdb_bfd_open (const char *name, const char *target, int fd)
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{
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hashval_t hash;
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void **slot;
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bfd *abfd;
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struct gdb_bfd_cache_search search;
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struct stat st;
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if (is_target_filename (name))
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{
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if (!target_filesystem_is_local ())
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{
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gdb_assert (fd == -1);
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return gdb_bfd_openr_iovec (name, target,
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gdb_bfd_iovec_fileio_open,
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current_inferior (),
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gdb_bfd_iovec_fileio_pread,
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gdb_bfd_iovec_fileio_close,
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gdb_bfd_iovec_fileio_fstat);
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}
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name += strlen (TARGET_SYSROOT_PREFIX);
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}
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if (gdb_bfd_cache == NULL)
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gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL,
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xcalloc, xfree);
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if (fd == -1)
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{
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fd = gdb_open_cloexec (name, O_RDONLY | O_BINARY, 0);
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if (fd == -1)
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{
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bfd_set_error (bfd_error_system_call);
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return NULL;
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}
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}
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search.filename = name;
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if (fstat (fd, &st) < 0)
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{
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/* Weird situation here. */
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search.mtime = 0;
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search.size = 0;
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search.inode = 0;
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search.device_id = 0;
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}
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else
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{
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search.mtime = st.st_mtime;
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search.size = st.st_size;
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search.inode = st.st_ino;
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search.device_id = st.st_dev;
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}
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/* Note that this must compute the same result as hash_bfd. */
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hash = htab_hash_string (name);
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/* Note that we cannot use htab_find_slot_with_hash here, because
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opening the BFD may fail; and this would violate hashtab
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invariants. */
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abfd = (struct bfd *) htab_find_with_hash (gdb_bfd_cache, &search, hash);
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if (bfd_sharing && abfd != NULL)
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{
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if (debug_bfd_cache)
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fprintf_unfiltered (gdb_stdlog,
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"Reusing cached bfd %s for %s\n",
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host_address_to_string (abfd),
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bfd_get_filename (abfd));
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close (fd);
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gdb_bfd_ref (abfd);
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return abfd;
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}
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abfd = bfd_fopen (name, target, FOPEN_RB, fd);
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if (abfd == NULL)
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return NULL;
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if (debug_bfd_cache)
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fprintf_unfiltered (gdb_stdlog,
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"Creating new bfd %s for %s\n",
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host_address_to_string (abfd),
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bfd_get_filename (abfd));
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if (bfd_sharing)
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{
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slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, INSERT);
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gdb_assert (!*slot);
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*slot = abfd;
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||
}
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||
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gdb_bfd_ref (abfd);
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||
return abfd;
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||
}
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||
|
||
/* A helper function that releases any section data attached to the
|
||
BFD. */
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||
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||
static void
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free_one_bfd_section (bfd *abfd, asection *sectp, void *ignore)
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{
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||
struct gdb_bfd_section_data *sect
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= (struct gdb_bfd_section_data *) bfd_get_section_userdata (abfd, sectp);
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||
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||
if (sect != NULL && sect->data != NULL)
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||
{
|
||
#ifdef HAVE_MMAP
|
||
if (sect->map_addr != NULL)
|
||
{
|
||
int res;
|
||
|
||
res = munmap (sect->map_addr, sect->map_len);
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||
gdb_assert (res == 0);
|
||
}
|
||
else
|
||
#endif
|
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xfree (sect->data);
|
||
}
|
||
}
|
||
|
||
/* Close ABFD, and warn if that fails. */
|
||
|
||
static int
|
||
gdb_bfd_close_or_warn (struct bfd *abfd)
|
||
{
|
||
int ret;
|
||
char *name = bfd_get_filename (abfd);
|
||
|
||
bfd_map_over_sections (abfd, free_one_bfd_section, NULL);
|
||
|
||
ret = bfd_close (abfd);
|
||
|
||
if (!ret)
|
||
warning (_("cannot close \"%s\": %s"),
|
||
name, bfd_errmsg (bfd_get_error ()));
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
void
|
||
gdb_bfd_ref (struct bfd *abfd)
|
||
{
|
||
struct stat buf;
|
||
struct gdb_bfd_data *gdata;
|
||
void **slot;
|
||
|
||
if (abfd == NULL)
|
||
return;
|
||
|
||
gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
|
||
|
||
if (debug_bfd_cache)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
"Increase reference count on bfd %s (%s)\n",
|
||
host_address_to_string (abfd),
|
||
bfd_get_filename (abfd));
|
||
|
||
if (gdata != NULL)
|
||
{
|
||
gdata->refc += 1;
|
||
return;
|
||
}
|
||
|
||
/* Ask BFD to decompress sections in bfd_get_full_section_contents. */
|
||
abfd->flags |= BFD_DECOMPRESS;
|
||
|
||
gdata
|
||
= (struct gdb_bfd_data *) bfd_zalloc (abfd, sizeof (struct gdb_bfd_data));
|
||
gdata->refc = 1;
|
||
gdata->mtime = bfd_get_mtime (abfd);
|
||
gdata->size = bfd_get_size (abfd);
|
||
gdata->archive_bfd = NULL;
|
||
if (bfd_stat (abfd, &buf) == 0)
|
||
{
|
||
gdata->inode = buf.st_ino;
|
||
gdata->device_id = buf.st_dev;
|
||
}
|
||
else
|
||
{
|
||
/* The stat failed. */
|
||
gdata->inode = 0;
|
||
gdata->device_id = 0;
|
||
}
|
||
bfd_usrdata (abfd) = gdata;
|
||
|
||
bfd_alloc_data (abfd);
|
||
|
||
/* This is the first we've seen it, so add it to the hash table. */
|
||
slot = htab_find_slot (all_bfds, abfd, INSERT);
|
||
gdb_assert (slot && !*slot);
|
||
*slot = abfd;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
void
|
||
gdb_bfd_unref (struct bfd *abfd)
|
||
{
|
||
int ix;
|
||
struct gdb_bfd_data *gdata;
|
||
struct gdb_bfd_cache_search search;
|
||
bfd *archive_bfd, *included_bfd;
|
||
|
||
if (abfd == NULL)
|
||
return;
|
||
|
||
gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
|
||
gdb_assert (gdata->refc >= 1);
|
||
|
||
gdata->refc -= 1;
|
||
if (gdata->refc > 0)
|
||
{
|
||
if (debug_bfd_cache)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
"Decrease reference count on bfd %s (%s)\n",
|
||
host_address_to_string (abfd),
|
||
bfd_get_filename (abfd));
|
||
return;
|
||
}
|
||
|
||
if (debug_bfd_cache)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
"Delete final reference count on bfd %s (%s)\n",
|
||
host_address_to_string (abfd),
|
||
bfd_get_filename (abfd));
|
||
|
||
archive_bfd = gdata->archive_bfd;
|
||
search.filename = bfd_get_filename (abfd);
|
||
|
||
if (gdb_bfd_cache && search.filename)
|
||
{
|
||
hashval_t hash = htab_hash_string (search.filename);
|
||
void **slot;
|
||
|
||
search.mtime = gdata->mtime;
|
||
search.size = gdata->size;
|
||
search.inode = gdata->inode;
|
||
search.device_id = gdata->device_id;
|
||
slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash,
|
||
NO_INSERT);
|
||
|
||
if (slot && *slot)
|
||
htab_clear_slot (gdb_bfd_cache, slot);
|
||
}
|
||
|
||
for (ix = 0;
|
||
VEC_iterate (bfdp, gdata->included_bfds, ix, included_bfd);
|
||
++ix)
|
||
gdb_bfd_unref (included_bfd);
|
||
VEC_free (bfdp, gdata->included_bfds);
|
||
|
||
bfd_free_data (abfd);
|
||
bfd_usrdata (abfd) = NULL; /* Paranoia. */
|
||
|
||
htab_remove_elt (all_bfds, abfd);
|
||
|
||
gdb_bfd_close_or_warn (abfd);
|
||
|
||
gdb_bfd_unref (archive_bfd);
|
||
}
|
||
|
||
/* A helper function that returns the section data descriptor
|
||
associated with SECTION. If no such descriptor exists, a new one
|
||
is allocated and cleared. */
|
||
|
||
static struct gdb_bfd_section_data *
|
||
get_section_descriptor (asection *section)
|
||
{
|
||
struct gdb_bfd_section_data *result;
|
||
|
||
result = ((struct gdb_bfd_section_data *)
|
||
bfd_get_section_userdata (section->owner, section));
|
||
|
||
if (result == NULL)
|
||
{
|
||
result = ((struct gdb_bfd_section_data *)
|
||
bfd_zalloc (section->owner, sizeof (*result)));
|
||
bfd_set_section_userdata (section->owner, section, result);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
const gdb_byte *
|
||
gdb_bfd_map_section (asection *sectp, bfd_size_type *size)
|
||
{
|
||
bfd *abfd;
|
||
struct gdb_bfd_section_data *descriptor;
|
||
bfd_byte *data;
|
||
|
||
gdb_assert ((sectp->flags & SEC_RELOC) == 0);
|
||
gdb_assert (size != NULL);
|
||
|
||
abfd = sectp->owner;
|
||
|
||
descriptor = get_section_descriptor (sectp);
|
||
|
||
/* If the data was already read for this BFD, just reuse it. */
|
||
if (descriptor->data != NULL)
|
||
goto done;
|
||
|
||
#ifdef HAVE_MMAP
|
||
if (!bfd_is_section_compressed (abfd, sectp))
|
||
{
|
||
/* The page size, used when mmapping. */
|
||
static int pagesize;
|
||
|
||
if (pagesize == 0)
|
||
pagesize = getpagesize ();
|
||
|
||
/* Only try to mmap sections which are large enough: we don't want
|
||
to waste space due to fragmentation. */
|
||
|
||
if (bfd_get_section_size (sectp) > 4 * pagesize)
|
||
{
|
||
descriptor->size = bfd_get_section_size (sectp);
|
||
descriptor->data = bfd_mmap (abfd, 0, descriptor->size, PROT_READ,
|
||
MAP_PRIVATE, sectp->filepos,
|
||
&descriptor->map_addr,
|
||
&descriptor->map_len);
|
||
|
||
if ((caddr_t)descriptor->data != MAP_FAILED)
|
||
{
|
||
#if HAVE_POSIX_MADVISE
|
||
posix_madvise (descriptor->map_addr, descriptor->map_len,
|
||
POSIX_MADV_WILLNEED);
|
||
#endif
|
||
goto done;
|
||
}
|
||
|
||
/* On failure, clear out the section data and try again. */
|
||
memset (descriptor, 0, sizeof (*descriptor));
|
||
}
|
||
}
|
||
#endif /* HAVE_MMAP */
|
||
|
||
/* Handle compressed sections, or ordinary uncompressed sections in
|
||
the no-mmap case. */
|
||
|
||
descriptor->size = bfd_get_section_size (sectp);
|
||
descriptor->data = NULL;
|
||
|
||
data = NULL;
|
||
if (!bfd_get_full_section_contents (abfd, sectp, &data))
|
||
error (_("Can't read data for section '%s' in file '%s'"),
|
||
bfd_get_section_name (abfd, sectp),
|
||
bfd_get_filename (abfd));
|
||
descriptor->data = data;
|
||
|
||
done:
|
||
gdb_assert (descriptor->data != NULL);
|
||
*size = descriptor->size;
|
||
return (const gdb_byte *) descriptor->data;
|
||
}
|
||
|
||
/* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and
|
||
return 1. Otherwise print a warning and return 0. ABFD seek position is
|
||
not preserved. */
|
||
|
||
static int
|
||
get_file_crc (bfd *abfd, unsigned long *file_crc_return)
|
||
{
|
||
unsigned long file_crc = 0;
|
||
|
||
if (bfd_seek (abfd, 0, SEEK_SET) != 0)
|
||
{
|
||
warning (_("Problem reading \"%s\" for CRC: %s"),
|
||
bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
|
||
return 0;
|
||
}
|
||
|
||
for (;;)
|
||
{
|
||
gdb_byte buffer[8 * 1024];
|
||
bfd_size_type count;
|
||
|
||
count = bfd_bread (buffer, sizeof (buffer), abfd);
|
||
if (count == (bfd_size_type) -1)
|
||
{
|
||
warning (_("Problem reading \"%s\" for CRC: %s"),
|
||
bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
|
||
return 0;
|
||
}
|
||
if (count == 0)
|
||
break;
|
||
file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
|
||
}
|
||
|
||
*file_crc_return = file_crc;
|
||
return 1;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
int
|
||
gdb_bfd_crc (struct bfd *abfd, unsigned long *crc_out)
|
||
{
|
||
struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
|
||
|
||
if (!gdata->crc_computed)
|
||
gdata->crc_computed = get_file_crc (abfd, &gdata->crc);
|
||
|
||
if (gdata->crc_computed)
|
||
*crc_out = gdata->crc;
|
||
return gdata->crc_computed;
|
||
}
|
||
|
||
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
bfd *
|
||
gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
|
||
int fd)
|
||
{
|
||
bfd *result = bfd_fopen (filename, target, mode, fd);
|
||
|
||
if (result)
|
||
gdb_bfd_ref (result);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
bfd *
|
||
gdb_bfd_openr (const char *filename, const char *target)
|
||
{
|
||
bfd *result = bfd_openr (filename, target);
|
||
|
||
if (result)
|
||
gdb_bfd_ref (result);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
bfd *
|
||
gdb_bfd_openw (const char *filename, const char *target)
|
||
{
|
||
bfd *result = bfd_openw (filename, target);
|
||
|
||
if (result)
|
||
gdb_bfd_ref (result);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
bfd *
|
||
gdb_bfd_openr_iovec (const char *filename, const char *target,
|
||
void *(*open_func) (struct bfd *nbfd,
|
||
void *open_closure),
|
||
void *open_closure,
|
||
file_ptr (*pread_func) (struct bfd *nbfd,
|
||
void *stream,
|
||
void *buf,
|
||
file_ptr nbytes,
|
||
file_ptr offset),
|
||
int (*close_func) (struct bfd *nbfd,
|
||
void *stream),
|
||
int (*stat_func) (struct bfd *abfd,
|
||
void *stream,
|
||
struct stat *sb))
|
||
{
|
||
bfd *result = bfd_openr_iovec (filename, target,
|
||
open_func, open_closure,
|
||
pread_func, close_func, stat_func);
|
||
|
||
if (result)
|
||
gdb_bfd_ref (result);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
void
|
||
gdb_bfd_mark_parent (bfd *child, bfd *parent)
|
||
{
|
||
struct gdb_bfd_data *gdata;
|
||
|
||
gdb_bfd_ref (child);
|
||
/* No need to stash the filename here, because we also keep a
|
||
reference on the parent archive. */
|
||
|
||
gdata = (struct gdb_bfd_data *) bfd_usrdata (child);
|
||
if (gdata->archive_bfd == NULL)
|
||
{
|
||
gdata->archive_bfd = parent;
|
||
gdb_bfd_ref (parent);
|
||
}
|
||
else
|
||
gdb_assert (gdata->archive_bfd == parent);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
bfd *
|
||
gdb_bfd_openr_next_archived_file (bfd *archive, bfd *previous)
|
||
{
|
||
bfd *result = bfd_openr_next_archived_file (archive, previous);
|
||
|
||
if (result)
|
||
gdb_bfd_mark_parent (result, archive);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
void
|
||
gdb_bfd_record_inclusion (bfd *includer, bfd *includee)
|
||
{
|
||
struct gdb_bfd_data *gdata;
|
||
|
||
gdb_bfd_ref (includee);
|
||
gdata = (struct gdb_bfd_data *) bfd_usrdata (includer);
|
||
VEC_safe_push (bfdp, gdata->included_bfds, includee);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
bfd *
|
||
gdb_bfd_fdopenr (const char *filename, const char *target, int fd)
|
||
{
|
||
bfd *result = bfd_fdopenr (filename, target, fd);
|
||
|
||
if (result)
|
||
gdb_bfd_ref (result);
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
|
||
gdb_static_assert (ARRAY_SIZE (_bfd_std_section) == 4);
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
int
|
||
gdb_bfd_section_index (bfd *abfd, asection *section)
|
||
{
|
||
if (section == NULL)
|
||
return -1;
|
||
else if (section == bfd_com_section_ptr)
|
||
return bfd_count_sections (abfd);
|
||
else if (section == bfd_und_section_ptr)
|
||
return bfd_count_sections (abfd) + 1;
|
||
else if (section == bfd_abs_section_ptr)
|
||
return bfd_count_sections (abfd) + 2;
|
||
else if (section == bfd_ind_section_ptr)
|
||
return bfd_count_sections (abfd) + 3;
|
||
return section->index;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
int
|
||
gdb_bfd_count_sections (bfd *abfd)
|
||
{
|
||
return bfd_count_sections (abfd) + 4;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
int
|
||
gdb_bfd_requires_relocations (bfd *abfd)
|
||
{
|
||
struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
|
||
|
||
if (gdata->relocation_computed == 0)
|
||
{
|
||
asection *sect;
|
||
|
||
for (sect = abfd->sections; sect != NULL; sect = sect->next)
|
||
if ((sect->flags & SEC_RELOC) != 0)
|
||
{
|
||
gdata->needs_relocations = 1;
|
||
break;
|
||
}
|
||
|
||
gdata->relocation_computed = 1;
|
||
}
|
||
|
||
return gdata->needs_relocations;
|
||
}
|
||
|
||
|
||
|
||
/* A callback for htab_traverse that prints a single BFD. */
|
||
|
||
static int
|
||
print_one_bfd (void **slot, void *data)
|
||
{
|
||
bfd *abfd = (struct bfd *) *slot;
|
||
struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
|
||
struct ui_out *uiout = (struct ui_out *) data;
|
||
struct cleanup *inner;
|
||
|
||
inner = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
|
||
ui_out_field_int (uiout, "refcount", gdata->refc);
|
||
ui_out_field_string (uiout, "addr", host_address_to_string (abfd));
|
||
ui_out_field_string (uiout, "filename", bfd_get_filename (abfd));
|
||
ui_out_text (uiout, "\n");
|
||
do_cleanups (inner);
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Implement the 'maint info bfd' command. */
|
||
|
||
static void
|
||
maintenance_info_bfds (char *arg, int from_tty)
|
||
{
|
||
struct cleanup *cleanup;
|
||
struct ui_out *uiout = current_uiout;
|
||
|
||
cleanup = make_cleanup_ui_out_table_begin_end (uiout, 3, -1, "bfds");
|
||
ui_out_table_header (uiout, 10, ui_left, "refcount", "Refcount");
|
||
ui_out_table_header (uiout, 18, ui_left, "addr", "Address");
|
||
ui_out_table_header (uiout, 40, ui_left, "filename", "Filename");
|
||
|
||
ui_out_table_body (uiout);
|
||
htab_traverse (all_bfds, print_one_bfd, uiout);
|
||
|
||
do_cleanups (cleanup);
|
||
}
|
||
|
||
/* -Wmissing-prototypes */
|
||
extern initialize_file_ftype _initialize_gdb_bfd;
|
||
|
||
void
|
||
_initialize_gdb_bfd (void)
|
||
{
|
||
all_bfds = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
|
||
NULL, xcalloc, xfree);
|
||
|
||
add_cmd ("bfds", class_maintenance, maintenance_info_bfds, _("\
|
||
List the BFDs that are currently open."),
|
||
&maintenanceinfolist);
|
||
|
||
add_setshow_boolean_cmd ("bfd-sharing", no_class,
|
||
&bfd_sharing, _("\
|
||
Set whether gdb will share bfds that appear to be the same file."), _("\
|
||
Show whether gdb will share bfds that appear to be the same file."), _("\
|
||
When enabled gdb will reuse existing bfds rather than reopening the\n\
|
||
same file. To decide if two files are the same then gdb compares the\n\
|
||
filename, file size, file modification time, and file inode."),
|
||
NULL,
|
||
&show_bfd_sharing,
|
||
&maintenance_set_cmdlist,
|
||
&maintenance_show_cmdlist);
|
||
|
||
add_setshow_zuinteger_cmd ("bfd-cache", class_maintenance,
|
||
&debug_bfd_cache, _("\
|
||
Set bfd cache debugging."), _("\
|
||
Show bfd cache debugging."), _("\
|
||
When non-zero, bfd cache specific debugging is enabled."),
|
||
NULL,
|
||
&show_bfd_cache_debug,
|
||
&setdebuglist, &showdebuglist);
|
||
}
|