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- /* Definitions for BFD wrappers used by GDB.
- Copyright (C) 2011-2022 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"
- #include "cli/cli-style.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
- {
- /* 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)
- {
- }
- ~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)
- {
- gdb_printf (file, _("BFD sharing is %s.\n"), value);
- }
- /* 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 void
- show_bfd_cache_debug (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
- {
- gdb_printf (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));
- }
- /* 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. */
- 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;
- }
- /* 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. */
- static void *
- 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 (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);
- 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;
- }
- /* Warn that it wasn't possible to close a bfd for file NAME, because
- of REASON. */
- static void
- gdb_bfd_close_warning (const char *name, const char *reason)
- {
- warning (_("cannot close \"%s\": %s"), name, reason);
- }
- /* 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. */
- try
- {
- target_fileio_close (fd, &target_errno);
- }
- catch (const gdb_exception &ex)
- {
- /* Also avoid crossing exceptions over bfd. */
- gdb_bfd_close_warning (bfd_get_filename (abfd),
- ex.message->c_str ());
- }
- /* 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;
- }
- /* 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,
- bool warn_if_slow)
- {
- 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);
- gdb_bfd_open_closure open_closure { current_inferior (), warn_if_slow };
- return gdb_bfd_openr_iovec (name, target,
- gdb_bfd_iovec_fileio_open,
- &open_closure,
- 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).release ();
- if (fd == -1)
- {
- bfd_set_error (bfd_error_system_call);
- return NULL;
- }
- }
- if (fstat (fd, &st) < 0)
- {
- /* 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
- 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)
- {
- 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);
- }
- abfd = bfd_fopen (name, target, FOPEN_RB, fd);
- if (abfd == NULL)
- return NULL;
- bfd_cache_debug_printf ("Creating new bfd %s for %s",
- 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;
- }
- /* 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 (asection *sectp)
- {
- 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);
- for (asection *sect : gdb_bfd_sections (abfd))
- free_one_bfd_section (sect);
- ret = bfd_close (abfd);
- if (!ret)
- gdb_bfd_close_warning (name,
- bfd_errmsg (bfd_get_error ()));
- return ret;
- }
- /* See gdb_bfd.h. */
- void
- gdb_bfd_ref (struct bfd *abfd)
- {
- struct gdb_bfd_data *gdata;
- if (abfd == NULL)
- return;
- gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
- bfd_cache_debug_printf ("Increase reference count on bfd %s (%s)",
- host_address_to_string (abfd),
- bfd_get_filename (abfd));
- if (gdata != NULL)
- {
- gdata->refc += 1;
- return;
- }
- /* Caching only happens via gdb_bfd_open, so passing nullptr here is
- fine. */
- gdb_bfd_init_data (abfd, nullptr);
- }
- /* 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)
- {
- bfd_cache_debug_printf ("Decrease reference count on bfd %s (%s)",
- host_address_to_string (abfd),
- bfd_get_filename (abfd));
- return;
- }
- 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);
- 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);
- }
- #define AMBIGUOUS_MESS1 ".\nMatching formats:"
- #define AMBIGUOUS_MESS2 \
- ".\nUse \"set gnutarget format-name\" to specify the format."
- /* See gdb_bfd.h. */
- std::string
- gdb_bfd_errmsg (bfd_error_type error_tag, char **matching)
- {
- char **p;
- /* Check if errmsg just need simple return. */
- if (error_tag != bfd_error_file_ambiguously_recognized || matching == NULL)
- return bfd_errmsg (error_tag);
- std::string ret (bfd_errmsg (error_tag));
- ret += AMBIGUOUS_MESS1;
- for (p = matching; *p; p++)
- {
- ret += " ";
- ret += *p;
- }
- ret += AMBIGUOUS_MESS2;
- xfree (matching);
- return ret;
- }
- /* 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),
- file_name_style.style ());
- 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_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);
- }
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