1009 lines
24 KiB
C
1009 lines
24 KiB
C
/* Definitions for BFD wrappers used by GDB.
|
||
|
||
Copyright (C) 2011-2020 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "gdb_bfd.h"
|
||
#include "ui-out.h"
|
||
#include "gdbcmd.h"
|
||
#include "hashtab.h"
|
||
#include "gdbsupport/filestuff.h"
|
||
#ifdef HAVE_MMAP
|
||
#include <sys/mman.h>
|
||
#ifndef MAP_FAILED
|
||
#define MAP_FAILED ((void *) -1)
|
||
#endif
|
||
#endif
|
||
#include "target.h"
|
||
#include "gdb/fileio.h"
|
||
#include "inferior.h"
|
||
|
||
/* An object of this type is stored in the section's user data when
|
||
mapping a section. */
|
||
|
||
struct gdb_bfd_section_data
|
||
{
|
||
/* Size of the data. */
|
||
bfd_size_type size;
|
||
/* If the data was mmapped, this is the length of the map. */
|
||
bfd_size_type map_len;
|
||
/* The data. If NULL, the section data has not been read. */
|
||
void *data;
|
||
/* If the data was mmapped, this is the map address. */
|
||
void *map_addr;
|
||
};
|
||
|
||
/* A hash table holding every BFD that gdb knows about. This is not
|
||
to be confused with 'gdb_bfd_cache', which is used for sharing
|
||
BFDs; in contrast, this hash is used just to implement
|
||
"maint info bfd". */
|
||
|
||
static htab_t all_bfds;
|
||
|
||
/* An object of this type is stored in each BFD's user data. */
|
||
|
||
struct gdb_bfd_data
|
||
{
|
||
gdb_bfd_data (bfd *abfd)
|
||
: mtime (bfd_get_mtime (abfd)),
|
||
size (bfd_get_size (abfd)),
|
||
relocation_computed (0),
|
||
needs_relocations (0),
|
||
crc_computed (0)
|
||
{
|
||
struct stat buf;
|
||
|
||
if (bfd_stat (abfd, &buf) == 0)
|
||
{
|
||
inode = buf.st_ino;
|
||
device_id = buf.st_dev;
|
||
}
|
||
else
|
||
{
|
||
/* The stat failed. */
|
||
inode = 0;
|
||
device_id = 0;
|
||
}
|
||
}
|
||
|
||
~gdb_bfd_data ()
|
||
{
|
||
}
|
||
|
||
/* The reference count. */
|
||
int refc = 1;
|
||
|
||
/* The mtime of the BFD at the point the cache entry was made. */
|
||
time_t mtime;
|
||
|
||
/* The file size (in bytes) at the point the cache entry was made. */
|
||
off_t size;
|
||
|
||
/* The inode of the file at the point the cache entry was made. */
|
||
ino_t inode;
|
||
|
||
/* The device id of the file at the point the cache entry was made. */
|
||
dev_t device_id;
|
||
|
||
/* This is true if we have determined whether this BFD has any
|
||
sections requiring relocation. */
|
||
unsigned int relocation_computed : 1;
|
||
|
||
/* This is true if any section needs relocation. */
|
||
unsigned int needs_relocations : 1;
|
||
|
||
/* This is true if we have successfully computed the file's CRC. */
|
||
unsigned int crc_computed : 1;
|
||
|
||
/* The file's CRC. */
|
||
unsigned long crc = 0;
|
||
|
||
/* If the BFD comes from an archive, this points to the archive's
|
||
BFD. Otherwise, this is NULL. */
|
||
bfd *archive_bfd = nullptr;
|
||
|
||
/* Table of all the bfds this bfd has included. */
|
||
std::vector<gdb_bfd_ref_ptr> included_bfds;
|
||
|
||
/* The registry. */
|
||
REGISTRY_FIELDS = {};
|
||
};
|
||
|
||
#define GDB_BFD_DATA_ACCESSOR(ABFD) \
|
||
((struct gdb_bfd_data *) bfd_usrdata (ABFD))
|
||
|
||
DEFINE_REGISTRY (bfd, GDB_BFD_DATA_ACCESSOR)
|
||
|
||
/* A hash table storing all the BFDs maintained in the cache. */
|
||
|
||
static htab_t gdb_bfd_cache;
|
||
|
||
/* When true gdb will reuse an existing bfd object if the filename,
|
||
modification time, and file size all match. */
|
||
|
||
static bool bfd_sharing = true;
|
||
static void
|
||
show_bfd_sharing (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("BFD sharing is %s.\n"), value);
|
||
}
|
||
|
||
/* When non-zero debugging of the bfd caches is enabled. */
|
||
|
||
static unsigned int debug_bfd_cache;
|
||
static void
|
||
show_bfd_cache_debug (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("BFD cache debugging is %s.\n"), value);
|
||
}
|
||
|
||
/* The type of an object being looked up in gdb_bfd_cache. We use
|
||
htab's capability of storing one kind of object (BFD in this case)
|
||
and using a different sort of object for searching. */
|
||
|
||
struct gdb_bfd_cache_search
|
||
{
|
||
/* The filename. */
|
||
const char *filename;
|
||
/* The mtime. */
|
||
time_t mtime;
|
||
/* The file size (in bytes). */
|
||
off_t size;
|
||
/* The inode of the file. */
|
||
ino_t inode;
|
||
/* The device id of the file. */
|
||
dev_t device_id;
|
||
};
|
||
|
||
/* A hash function for BFDs. */
|
||
|
||
static hashval_t
|
||
hash_bfd (const void *b)
|
||
{
|
||
const bfd *abfd = (const struct bfd *) b;
|
||
|
||
/* It is simplest to just hash the filename. */
|
||
return htab_hash_string (bfd_get_filename (abfd));
|
||
}
|
||
|
||
/* An equality function for BFDs. Note that this expects the caller
|
||
to search using struct gdb_bfd_cache_search only, not BFDs. */
|
||
|
||
static int
|
||
eq_bfd (const void *a, const void *b)
|
||
{
|
||
const bfd *abfd = (const struct bfd *) a;
|
||
const struct gdb_bfd_cache_search *s
|
||
= (const struct gdb_bfd_cache_search *) b;
|
||
struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
|
||
|
||
return (gdata->mtime == s->mtime
|
||
&& gdata->size == s->size
|
||
&& gdata->inode == s->inode
|
||
&& gdata->device_id == s->device_id
|
||
&& strcmp (bfd_get_filename (abfd), s->filename) == 0);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
int
|
||
is_target_filename (const char *name)
|
||
{
|
||
return startswith (name, TARGET_SYSROOT_PREFIX);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
int
|
||
gdb_bfd_has_target_filename (struct bfd *abfd)
|
||
{
|
||
return is_target_filename (bfd_get_filename (abfd));
|
||
}
|
||
|
||
|
||
/* Return the system error number corresponding to ERRNUM. */
|
||
|
||
static int
|
||
fileio_errno_to_host (int errnum)
|
||
{
|
||
switch (errnum)
|
||
{
|
||
case FILEIO_EPERM:
|
||
return EPERM;
|
||
case FILEIO_ENOENT:
|
||
return ENOENT;
|
||
case FILEIO_EINTR:
|
||
return EINTR;
|
||
case FILEIO_EIO:
|
||
return EIO;
|
||
case FILEIO_EBADF:
|
||
return EBADF;
|
||
case FILEIO_EACCES:
|
||
return EACCES;
|
||
case FILEIO_EFAULT:
|
||
return EFAULT;
|
||
case FILEIO_EBUSY:
|
||
return EBUSY;
|
||
case FILEIO_EEXIST:
|
||
return EEXIST;
|
||
case FILEIO_ENODEV:
|
||
return ENODEV;
|
||
case FILEIO_ENOTDIR:
|
||
return ENOTDIR;
|
||
case FILEIO_EISDIR:
|
||
return EISDIR;
|
||
case FILEIO_EINVAL:
|
||
return EINVAL;
|
||
case FILEIO_ENFILE:
|
||
return ENFILE;
|
||
case FILEIO_EMFILE:
|
||
return EMFILE;
|
||
case FILEIO_EFBIG:
|
||
return EFBIG;
|
||
case FILEIO_ENOSPC:
|
||
return ENOSPC;
|
||
case FILEIO_ESPIPE:
|
||
return ESPIPE;
|
||
case FILEIO_EROFS:
|
||
return EROFS;
|
||
case FILEIO_ENOSYS:
|
||
return ENOSYS;
|
||
case FILEIO_ENAMETOOLONG:
|
||
return ENAMETOOLONG;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/* Wrapper for target_fileio_open suitable for passing as the
|
||
OPEN_FUNC argument to gdb_bfd_openr_iovec. The supplied
|
||
OPEN_CLOSURE is unused. */
|
||
|
||
static void *
|
||
gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *inferior)
|
||
{
|
||
const char *filename = bfd_get_filename (abfd);
|
||
int fd, target_errno;
|
||
int *stream;
|
||
|
||
gdb_assert (is_target_filename (filename));
|
||
|
||
fd = target_fileio_open_warn_if_slow ((struct inferior *) inferior,
|
||
filename
|
||
+ strlen (TARGET_SYSROOT_PREFIX),
|
||
FILEIO_O_RDONLY, 0,
|
||
&target_errno);
|
||
if (fd == -1)
|
||
{
|
||
errno = fileio_errno_to_host (target_errno);
|
||
bfd_set_error (bfd_error_system_call);
|
||
return NULL;
|
||
}
|
||
|
||
stream = XCNEW (int);
|
||
*stream = fd;
|
||
return stream;
|
||
}
|
||
|
||
/* Wrapper for target_fileio_pread suitable for passing as the
|
||
PREAD_FUNC argument to gdb_bfd_openr_iovec. */
|
||
|
||
static file_ptr
|
||
gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf,
|
||
file_ptr nbytes, file_ptr offset)
|
||
{
|
||
int fd = *(int *) stream;
|
||
int target_errno;
|
||
file_ptr pos, bytes;
|
||
|
||
pos = 0;
|
||
while (nbytes > pos)
|
||
{
|
||
QUIT;
|
||
|
||
bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos,
|
||
nbytes - pos, offset + pos,
|
||
&target_errno);
|
||
if (bytes == 0)
|
||
/* Success, but no bytes, means end-of-file. */
|
||
break;
|
||
if (bytes == -1)
|
||
{
|
||
errno = fileio_errno_to_host (target_errno);
|
||
bfd_set_error (bfd_error_system_call);
|
||
return -1;
|
||
}
|
||
|
||
pos += bytes;
|
||
}
|
||
|
||
return pos;
|
||
}
|
||
|
||
/* Wrapper for target_fileio_close suitable for passing as the
|
||
CLOSE_FUNC argument to gdb_bfd_openr_iovec. */
|
||
|
||
static int
|
||
gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream)
|
||
{
|
||
int fd = *(int *) stream;
|
||
int target_errno;
|
||
|
||
xfree (stream);
|
||
|
||
/* Ignore errors on close. These may happen with remote
|
||
targets if the connection has already been torn down. */
|
||
target_fileio_close (fd, &target_errno);
|
||
|
||
/* Zero means success. */
|
||
return 0;
|
||
}
|
||
|
||
/* Wrapper for target_fileio_fstat suitable for passing as the
|
||
STAT_FUNC argument to gdb_bfd_openr_iovec. */
|
||
|
||
static int
|
||
gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream,
|
||
struct stat *sb)
|
||
{
|
||
int fd = *(int *) stream;
|
||
int target_errno;
|
||
int result;
|
||
|
||
result = target_fileio_fstat (fd, sb, &target_errno);
|
||
if (result == -1)
|
||
{
|
||
errno = fileio_errno_to_host (target_errno);
|
||
bfd_set_error (bfd_error_system_call);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
gdb_bfd_ref_ptr
|
||
gdb_bfd_open (const char *name, const char *target, int fd)
|
||
{
|
||
hashval_t hash;
|
||
void **slot;
|
||
bfd *abfd;
|
||
struct gdb_bfd_cache_search search;
|
||
struct stat st;
|
||
|
||
if (is_target_filename (name))
|
||
{
|
||
if (!target_filesystem_is_local ())
|
||
{
|
||
gdb_assert (fd == -1);
|
||
|
||
return gdb_bfd_openr_iovec (name, target,
|
||
gdb_bfd_iovec_fileio_open,
|
||
current_inferior (),
|
||
gdb_bfd_iovec_fileio_pread,
|
||
gdb_bfd_iovec_fileio_close,
|
||
gdb_bfd_iovec_fileio_fstat);
|
||
}
|
||
|
||
name += strlen (TARGET_SYSROOT_PREFIX);
|
||
}
|
||
|
||
if (gdb_bfd_cache == NULL)
|
||
gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL,
|
||
xcalloc, xfree);
|
||
|
||
if (fd == -1)
|
||
{
|
||
fd = gdb_open_cloexec (name, O_RDONLY | O_BINARY, 0);
|
||
if (fd == -1)
|
||
{
|
||
bfd_set_error (bfd_error_system_call);
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
search.filename = name;
|
||
if (fstat (fd, &st) < 0)
|
||
{
|
||
/* Weird situation here. */
|
||
search.mtime = 0;
|
||
search.size = 0;
|
||
search.inode = 0;
|
||
search.device_id = 0;
|
||
}
|
||
else
|
||
{
|
||
search.mtime = st.st_mtime;
|
||
search.size = st.st_size;
|
||
search.inode = st.st_ino;
|
||
search.device_id = st.st_dev;
|
||
}
|
||
|
||
/* Note that this must compute the same result as hash_bfd. */
|
||
hash = htab_hash_string (name);
|
||
/* Note that we cannot use htab_find_slot_with_hash here, because
|
||
opening the BFD may fail; and this would violate hashtab
|
||
invariants. */
|
||
abfd = (struct bfd *) htab_find_with_hash (gdb_bfd_cache, &search, hash);
|
||
if (bfd_sharing && abfd != NULL)
|
||
{
|
||
if (debug_bfd_cache)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
"Reusing cached bfd %s for %s\n",
|
||
host_address_to_string (abfd),
|
||
bfd_get_filename (abfd));
|
||
close (fd);
|
||
return gdb_bfd_ref_ptr::new_reference (abfd);
|
||
}
|
||
|
||
abfd = bfd_fopen (name, target, FOPEN_RB, fd);
|
||
if (abfd == NULL)
|
||
return NULL;
|
||
|
||
if (debug_bfd_cache)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
"Creating new bfd %s for %s\n",
|
||
host_address_to_string (abfd),
|
||
bfd_get_filename (abfd));
|
||
|
||
if (bfd_sharing)
|
||
{
|
||
slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, INSERT);
|
||
gdb_assert (!*slot);
|
||
*slot = abfd;
|
||
}
|
||
|
||
return gdb_bfd_ref_ptr::new_reference (abfd);
|
||
}
|
||
|
||
/* A helper function that releases any section data attached to the
|
||
BFD. */
|
||
|
||
static void
|
||
free_one_bfd_section (bfd *abfd, asection *sectp, void *ignore)
|
||
{
|
||
struct gdb_bfd_section_data *sect
|
||
= (struct gdb_bfd_section_data *) bfd_section_userdata (sectp);
|
||
|
||
if (sect != NULL && sect->data != NULL)
|
||
{
|
||
#ifdef HAVE_MMAP
|
||
if (sect->map_addr != NULL)
|
||
{
|
||
int res;
|
||
|
||
res = munmap (sect->map_addr, sect->map_len);
|
||
gdb_assert (res == 0);
|
||
}
|
||
else
|
||
#endif
|
||
xfree (sect->data);
|
||
}
|
||
}
|
||
|
||
/* Close ABFD, and warn if that fails. */
|
||
|
||
static int
|
||
gdb_bfd_close_or_warn (struct bfd *abfd)
|
||
{
|
||
int ret;
|
||
const 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 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 = new gdb_bfd_data (abfd);
|
||
bfd_set_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)
|
||
{
|
||
struct gdb_bfd_data *gdata;
|
||
struct gdb_bfd_cache_search search;
|
||
bfd *archive_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);
|
||
}
|
||
|
||
bfd_free_data (abfd);
|
||
delete gdata;
|
||
bfd_set_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_section_userdata (section);
|
||
|
||
if (result == NULL)
|
||
{
|
||
result = ((struct gdb_bfd_section_data *)
|
||
bfd_zalloc (section->owner, sizeof (*result)));
|
||
bfd_set_section_userdata (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_section_size (sectp) > 4 * pagesize)
|
||
{
|
||
descriptor->size = bfd_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_section_size (sectp);
|
||
descriptor->data = NULL;
|
||
|
||
data = NULL;
|
||
if (!bfd_get_full_section_contents (abfd, sectp, &data))
|
||
{
|
||
warning (_("Can't read data for section '%s' in file '%s'"),
|
||
bfd_section_name (sectp),
|
||
bfd_get_filename (abfd));
|
||
/* Set size to 0 to prevent further attempts to read the invalid
|
||
section. */
|
||
*size = 0;
|
||
return NULL;
|
||
}
|
||
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. */
|
||
|
||
gdb_bfd_ref_ptr
|
||
gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
|
||
int fd)
|
||
{
|
||
bfd *result = bfd_fopen (filename, target, mode, fd);
|
||
|
||
return gdb_bfd_ref_ptr::new_reference (result);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
gdb_bfd_ref_ptr
|
||
gdb_bfd_openr (const char *filename, const char *target)
|
||
{
|
||
bfd *result = bfd_openr (filename, target);
|
||
|
||
return gdb_bfd_ref_ptr::new_reference (result);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
gdb_bfd_ref_ptr
|
||
gdb_bfd_openw (const char *filename, const char *target)
|
||
{
|
||
bfd *result = bfd_openw (filename, target);
|
||
|
||
return gdb_bfd_ref_ptr::new_reference (result);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
gdb_bfd_ref_ptr
|
||
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);
|
||
|
||
return gdb_bfd_ref_ptr::new_reference (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. */
|
||
|
||
gdb_bfd_ref_ptr
|
||
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 gdb_bfd_ref_ptr (result);
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
void
|
||
gdb_bfd_record_inclusion (bfd *includer, bfd *includee)
|
||
{
|
||
struct gdb_bfd_data *gdata;
|
||
|
||
gdata = (struct gdb_bfd_data *) bfd_usrdata (includer);
|
||
gdata->included_bfds.push_back (gdb_bfd_ref_ptr::new_reference (includee));
|
||
}
|
||
|
||
|
||
|
||
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;
|
||
}
|
||
|
||
/* See gdb_bfd.h. */
|
||
|
||
bool
|
||
gdb_bfd_get_full_section_contents (bfd *abfd, asection *section,
|
||
gdb::byte_vector *contents)
|
||
{
|
||
bfd_size_type section_size = bfd_section_size (section);
|
||
|
||
contents->resize (section_size);
|
||
|
||
return bfd_get_section_contents (abfd, section, contents->data (), 0,
|
||
section_size);
|
||
}
|
||
|
||
/* 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;
|
||
|
||
ui_out_emit_tuple tuple_emitter (uiout, NULL);
|
||
uiout->field_signed ("refcount", gdata->refc);
|
||
uiout->field_string ("addr", host_address_to_string (abfd));
|
||
uiout->field_string ("filename", bfd_get_filename (abfd));
|
||
uiout->text ("\n");
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Implement the 'maint info bfd' command. */
|
||
|
||
static void
|
||
maintenance_info_bfds (const char *arg, int from_tty)
|
||
{
|
||
struct ui_out *uiout = current_uiout;
|
||
|
||
ui_out_emit_table table_emitter (uiout, 3, -1, "bfds");
|
||
uiout->table_header (10, ui_left, "refcount", "Refcount");
|
||
uiout->table_header (18, ui_left, "addr", "Address");
|
||
uiout->table_header (40, ui_left, "filename", "Filename");
|
||
|
||
uiout->table_body ();
|
||
htab_traverse (all_bfds, print_one_bfd, uiout);
|
||
}
|
||
|
||
void _initialize_gdb_bfd ();
|
||
void
|
||
_initialize_gdb_bfd ()
|
||
{
|
||
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);
|
||
}
|