/* Definitions for BFD wrappers used by GDB.
- Copyright (C) 2011-2020 Free Software Foundation, Inc.
+ Copyright (C) 2011-2021 Free Software Foundation, Inc.
This file is part of GDB.
struct gdb_bfd_data
{
- gdb_bfd_data (bfd *abfd)
- : mtime (bfd_get_mtime (abfd)),
- size (bfd_get_size (abfd)),
+ /* Note that if ST is nullptr, then we simply fill in zeroes. */
+ gdb_bfd_data (bfd *abfd, struct stat *st)
+ : mtime (st == nullptr ? 0 : st->st_mtime),
+ size (st == nullptr ? 0 : st->st_size),
+ inode (st == nullptr ? 0 : st->st_ino),
+ device_id (st == nullptr ? 0 : st->st_dev),
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 ()
fprintf_filtered (file, _("BFD sharing is %s.\n"), value);
}
-/* When non-zero debugging of the bfd caches is enabled. */
+/* When true debugging of the bfd caches is enabled. */
+
+static bool debug_bfd_cache;
+
+/* Print an "bfd-cache" debug statement. */
+
+#define bfd_cache_debug_printf(fmt, ...) \
+ debug_prefixed_printf_cond (debug_bfd_cache, "bfd-cache", fmt, ##__VA_ARGS__)
-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)
return is_target_filename (bfd_get_filename (abfd));
}
+/* For `gdb_bfd_open_from_target_memory`. */
+
+struct target_buffer
+{
+ CORE_ADDR base;
+ ULONGEST size;
+};
+
+/* For `gdb_bfd_open_from_target_memory`. Opening the file is a no-op. */
+
+static void *
+mem_bfd_iovec_open (struct bfd *abfd, void *open_closure)
+{
+ return open_closure;
+}
+
+/* For `gdb_bfd_open_from_target_memory`. Closing the file is just freeing the
+ base/size pair on our side. */
+
+static int
+mem_bfd_iovec_close (struct bfd *abfd, void *stream)
+{
+ xfree (stream);
+
+ /* Zero means success. */
+ return 0;
+}
+
+/* For `gdb_bfd_open_from_target_memory`. For reading the file, we just need to
+ pass through to target_read_memory and fix up the arguments and return
+ values. */
+
+static file_ptr
+mem_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf,
+ file_ptr nbytes, file_ptr offset)
+{
+ int err;
+ struct target_buffer *buffer = (struct target_buffer *) stream;
+
+ /* If this read will read all of the file, limit it to just the rest. */
+ if (offset + nbytes > buffer->size)
+ nbytes = buffer->size - offset;
+
+ /* If there are no more bytes left, we've reached EOF. */
+ if (nbytes == 0)
+ return 0;
+
+ err = target_read_memory (buffer->base + offset, (gdb_byte *) buf, nbytes);
+ if (err)
+ return -1;
+
+ return nbytes;
+}
+
+/* For `gdb_bfd_open_from_target_memory`. For statting the file, we only
+ support the st_size attribute. */
+
+static int
+mem_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb)
+{
+ struct target_buffer *buffer = (struct target_buffer*) stream;
+
+ memset (sb, 0, sizeof (struct stat));
+ sb->st_size = buffer->size;
+ return 0;
+}
+
+/* See gdb_bfd.h. */
+
+gdb_bfd_ref_ptr
+gdb_bfd_open_from_target_memory (CORE_ADDR addr, ULONGEST size,
+ const char *target,
+ const char *filename)
+{
+ struct target_buffer *buffer = XNEW (struct target_buffer);
+
+ buffer->base = addr;
+ buffer->size = size;
+ return gdb_bfd_openr_iovec (filename ? filename : "<in-memory>", target,
+ mem_bfd_iovec_open,
+ buffer,
+ mem_bfd_iovec_pread,
+ mem_bfd_iovec_close,
+ mem_bfd_iovec_stat);
+}
/* Return the system error number corresponding to ERRNUM. */
switch (errnum)
{
case FILEIO_EPERM:
- return EPERM;
+ return EPERM;
case FILEIO_ENOENT:
- return ENOENT;
+ return ENOENT;
case FILEIO_EINTR:
- return EINTR;
+ return EINTR;
case FILEIO_EIO:
- return EIO;
+ return EIO;
case FILEIO_EBADF:
- return EBADF;
+ return EBADF;
case FILEIO_EACCES:
- return EACCES;
+ return EACCES;
case FILEIO_EFAULT:
- return EFAULT;
+ return EFAULT;
case FILEIO_EBUSY:
- return EBUSY;
+ return EBUSY;
case FILEIO_EEXIST:
- return EEXIST;
+ return EEXIST;
case FILEIO_ENODEV:
- return ENODEV;
+ return ENODEV;
case FILEIO_ENOTDIR:
- return ENOTDIR;
+ return ENOTDIR;
case FILEIO_EISDIR:
- return EISDIR;
+ return EISDIR;
case FILEIO_EINVAL:
- return EINVAL;
+ return EINVAL;
case FILEIO_ENFILE:
- return ENFILE;
+ return ENFILE;
case FILEIO_EMFILE:
- return EMFILE;
+ return EMFILE;
case FILEIO_EFBIG:
- return EFBIG;
+ return EFBIG;
case FILEIO_ENOSPC:
- return ENOSPC;
+ return ENOSPC;
case FILEIO_ESPIPE:
- return ESPIPE;
+ return ESPIPE;
case FILEIO_EROFS:
- return EROFS;
+ return EROFS;
case FILEIO_ENOSYS:
- return ENOSYS;
+ return ENOSYS;
case FILEIO_ENAMETOOLONG:
- return ENAMETOOLONG;
+ return ENAMETOOLONG;
}
return -1;
}
+/* bfd_openr_iovec OPEN_CLOSURE data for gdb_bfd_open. */
+struct gdb_bfd_open_closure
+{
+ inferior *inf;
+ bool warn_if_slow;
+};
+
/* Wrapper for target_fileio_open suitable for passing as the
- OPEN_FUNC argument to gdb_bfd_openr_iovec. The supplied
- OPEN_CLOSURE is unused. */
+ OPEN_FUNC argument to gdb_bfd_openr_iovec. */
static void *
-gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *inferior)
+gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *open_closure)
{
const char *filename = bfd_get_filename (abfd);
int fd, target_errno;
int *stream;
+ gdb_bfd_open_closure *oclosure = (gdb_bfd_open_closure *) open_closure;
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);
+ fd = target_fileio_open (oclosure->inf,
+ filename + strlen (TARGET_SYSROOT_PREFIX),
+ FILEIO_O_RDONLY, 0, oclosure->warn_if_slow,
+ &target_errno);
if (fd == -1)
{
errno = fileio_errno_to_host (target_errno);
nbytes - pos, offset + pos,
&target_errno);
if (bytes == 0)
- /* Success, but no bytes, means end-of-file. */
- break;
+ /* Success, but no bytes, means end-of-file. */
+ break;
if (bytes == -1)
{
errno = fileio_errno_to_host (target_errno);
return result;
}
+/* A helper function to initialize the data that gdb attaches to each
+ BFD. */
+
+static void
+gdb_bfd_init_data (struct bfd *abfd, struct stat *st)
+{
+ struct gdb_bfd_data *gdata;
+ void **slot;
+
+ gdb_assert (bfd_usrdata (abfd) == nullptr);
+
+ /* Ask BFD to decompress sections in bfd_get_full_section_contents. */
+ abfd->flags |= BFD_DECOMPRESS;
+
+ gdata = new gdb_bfd_data (abfd, st);
+ 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. */
gdb_bfd_ref_ptr
-gdb_bfd_open (const char *name, const char *target, int fd)
+gdb_bfd_open (const char *name, const char *target, int fd,
+ bool warn_if_slow)
{
hashval_t hash;
void **slot;
{
gdb_assert (fd == -1);
+ gdb_bfd_open_closure open_closure { current_inferior (), warn_if_slow };
return gdb_bfd_openr_iovec (name, target,
gdb_bfd_iovec_fileio_open,
- current_inferior (),
+ &open_closure,
gdb_bfd_iovec_fileio_pread,
gdb_bfd_iovec_fileio_close,
gdb_bfd_iovec_fileio_fstat);
}
}
- 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;
+ /* Weird situation here -- don't cache if we can't stat. */
+ bfd_cache_debug_printf ("Could not stat %s - not caching", name);
+ abfd = bfd_fopen (name, target, FOPEN_RB, fd);
+ if (abfd == nullptr)
+ return nullptr;
+ return gdb_bfd_ref_ptr::new_reference (abfd);
}
+ search.filename = name;
+ 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
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));
+ bfd_cache_debug_printf ("Reusing cached bfd %s for %s",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
close (fd);
return gdb_bfd_ref_ptr::new_reference (abfd);
}
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));
+ bfd_cache_debug_printf ("Creating new bfd %s for %s",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
if (bfd_sharing)
{
*slot = abfd;
}
- return gdb_bfd_ref_ptr::new_reference (abfd);
+ /* It's important to pass the already-computed stat info here,
+ rather than, say, calling gdb_bfd_ref_ptr::new_reference. BFD by
+ default will "stat" the file each time bfd_get_mtime is called --
+ and since we already entered it into the hash table using this
+ mtime, if the file changed at the wrong moment, the race would
+ lead to a hash table corruption. */
+ gdb_bfd_init_data (abfd, &st);
+ return gdb_bfd_ref_ptr (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)
+free_one_bfd_section (asection *sectp)
{
struct gdb_bfd_section_data *sect
= (struct gdb_bfd_section_data *) bfd_section_userdata (sectp);
int ret;
const char *name = bfd_get_filename (abfd);
- bfd_map_over_sections (abfd, free_one_bfd_section, NULL);
+ for (asection *sect : gdb_bfd_sections (abfd))
+ free_one_bfd_section (sect);
ret = bfd_close (abfd);
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));
+ bfd_cache_debug_printf ("Increase reference count on bfd %s (%s)",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
if (gdata != NULL)
{
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;
+ /* Caching only happens via gdb_bfd_open, so passing nullptr here is
+ fine. */
+ gdb_bfd_init_data (abfd, nullptr);
}
/* See gdb_bfd.h. */
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));
+ bfd_cache_debug_printf ("Decrease reference count on bfd %s (%s)",
+ 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));
+ bfd_cache_debug_printf ("Delete final reference count on bfd %s (%s)",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
archive_bfd = gdata->archive_bfd;
search.filename = bfd_get_filename (abfd);
&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."), _("\
+ add_setshow_boolean_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);
+ NULL,
+ &show_bfd_cache_debug,
+ &setdebuglist, &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff