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32d0add0a6
gdb/ChangeLog: Update year range in copyright notice of all files.
715 lines
16 KiB
C
715 lines
16 KiB
C
/* Definitions for BFD wrappers used by GDB.
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Copyright (C) 2011-2015 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_ZLIB_H
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#include <zlib.h>
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#endif
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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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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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/* 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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/* 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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};
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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 = 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 = a;
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const struct gdb_bfd_cache_search *s = b;
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struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
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return (gdata->mtime == s->mtime
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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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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 (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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}
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else
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search.mtime = st.st_mtime;
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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 = htab_find_with_hash (gdb_bfd_cache, &search, hash);
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if (abfd != NULL)
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{
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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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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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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
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BFD. */
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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 = bfd_get_section_userdata (abfd, sectp);
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if (sect != NULL && sect->data != NULL)
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{
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#ifdef HAVE_MMAP
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if (sect->map_addr != NULL)
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{
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int res;
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res = munmap (sect->map_addr, sect->map_len);
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gdb_assert (res == 0);
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}
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else
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#endif
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xfree (sect->data);
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}
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}
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/* Close ABFD, and warn if that fails. */
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static int
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gdb_bfd_close_or_warn (struct bfd *abfd)
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{
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int ret;
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char *name = bfd_get_filename (abfd);
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bfd_map_over_sections (abfd, free_one_bfd_section, NULL);
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ret = bfd_close (abfd);
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if (!ret)
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warning (_("cannot close \"%s\": %s"),
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name, bfd_errmsg (bfd_get_error ()));
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return ret;
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}
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/* See gdb_bfd.h. */
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void
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gdb_bfd_ref (struct bfd *abfd)
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{
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struct gdb_bfd_data *gdata;
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void **slot;
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if (abfd == NULL)
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return;
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gdata = bfd_usrdata (abfd);
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if (gdata != NULL)
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{
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gdata->refc += 1;
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return;
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}
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/* Ask BFD to decompress sections in bfd_get_full_section_contents. */
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abfd->flags |= BFD_DECOMPRESS;
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gdata = bfd_zalloc (abfd, sizeof (struct gdb_bfd_data));
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gdata->refc = 1;
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gdata->mtime = bfd_get_mtime (abfd);
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gdata->archive_bfd = NULL;
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bfd_usrdata (abfd) = gdata;
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bfd_alloc_data (abfd);
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/* This is the first we've seen it, so add it to the hash table. */
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slot = htab_find_slot (all_bfds, abfd, INSERT);
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gdb_assert (slot && !*slot);
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*slot = abfd;
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}
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/* See gdb_bfd.h. */
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void
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gdb_bfd_unref (struct bfd *abfd)
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{
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int ix;
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struct gdb_bfd_data *gdata;
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struct gdb_bfd_cache_search search;
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bfd *archive_bfd, *included_bfd;
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if (abfd == NULL)
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return;
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gdata = bfd_usrdata (abfd);
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gdb_assert (gdata->refc >= 1);
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gdata->refc -= 1;
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if (gdata->refc > 0)
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return;
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archive_bfd = gdata->archive_bfd;
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search.filename = bfd_get_filename (abfd);
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if (gdb_bfd_cache && search.filename)
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{
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hashval_t hash = htab_hash_string (search.filename);
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void **slot;
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search.mtime = gdata->mtime;
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slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash,
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NO_INSERT);
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if (slot && *slot)
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htab_clear_slot (gdb_bfd_cache, slot);
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}
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for (ix = 0;
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VEC_iterate (bfdp, gdata->included_bfds, ix, included_bfd);
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++ix)
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gdb_bfd_unref (included_bfd);
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VEC_free (bfdp, gdata->included_bfds);
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bfd_free_data (abfd);
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bfd_usrdata (abfd) = NULL; /* Paranoia. */
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htab_remove_elt (all_bfds, abfd);
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gdb_bfd_close_or_warn (abfd);
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gdb_bfd_unref (archive_bfd);
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}
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/* A helper function that returns the section data descriptor
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associated with SECTION. If no such descriptor exists, a new one
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is allocated and cleared. */
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static struct gdb_bfd_section_data *
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get_section_descriptor (asection *section)
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{
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struct gdb_bfd_section_data *result;
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result = bfd_get_section_userdata (section->owner, section);
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if (result == NULL)
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{
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result = bfd_zalloc (section->owner, sizeof (*result));
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bfd_set_section_userdata (section->owner, section, result);
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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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const gdb_byte *
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gdb_bfd_map_section (asection *sectp, bfd_size_type *size)
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{
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bfd *abfd;
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struct gdb_bfd_section_data *descriptor;
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bfd_byte *data;
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gdb_assert ((sectp->flags & SEC_RELOC) == 0);
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gdb_assert (size != NULL);
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abfd = sectp->owner;
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descriptor = get_section_descriptor (sectp);
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/* If the data was already read for this BFD, just reuse it. */
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if (descriptor->data != NULL)
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goto done;
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#ifdef HAVE_MMAP
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if (!bfd_is_section_compressed (abfd, sectp))
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{
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/* The page size, used when mmapping. */
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static int pagesize;
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if (pagesize == 0)
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pagesize = getpagesize ();
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/* Only try to mmap sections which are large enough: we don't want
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to waste space due to fragmentation. */
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if (bfd_get_section_size (sectp) > 4 * pagesize)
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{
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descriptor->size = bfd_get_section_size (sectp);
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descriptor->data = bfd_mmap (abfd, 0, descriptor->size, PROT_READ,
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MAP_PRIVATE, sectp->filepos,
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&descriptor->map_addr,
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&descriptor->map_len);
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if ((caddr_t)descriptor->data != MAP_FAILED)
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{
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#if HAVE_POSIX_MADVISE
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posix_madvise (descriptor->map_addr, descriptor->map_len,
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POSIX_MADV_WILLNEED);
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#endif
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goto done;
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}
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/* On failure, clear out the section data and try again. */
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memset (descriptor, 0, sizeof (*descriptor));
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}
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}
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#endif /* HAVE_MMAP */
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/* Handle compressed sections, or ordinary uncompressed sections in
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the no-mmap case. */
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descriptor->size = bfd_get_section_size (sectp);
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descriptor->data = NULL;
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data = NULL;
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if (!bfd_get_full_section_contents (abfd, sectp, &data))
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error (_("Can't read data for section '%s' in file '%s'"),
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bfd_get_section_name (abfd, sectp),
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bfd_get_filename (abfd));
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descriptor->data = data;
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done:
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gdb_assert (descriptor->data != NULL);
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*size = descriptor->size;
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return descriptor->data;
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}
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/* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and
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return 1. Otherwise print a warning and return 0. ABFD seek position is
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not preserved. */
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static int
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get_file_crc (bfd *abfd, unsigned long *file_crc_return)
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{
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unsigned long file_crc = 0;
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if (bfd_seek (abfd, 0, SEEK_SET) != 0)
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{
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warning (_("Problem reading \"%s\" for CRC: %s"),
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bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
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return 0;
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}
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for (;;)
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{
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gdb_byte buffer[8 * 1024];
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bfd_size_type count;
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count = bfd_bread (buffer, sizeof (buffer), abfd);
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if (count == (bfd_size_type) -1)
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{
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warning (_("Problem reading \"%s\" for CRC: %s"),
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bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
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return 0;
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}
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if (count == 0)
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break;
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file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
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}
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*file_crc_return = file_crc;
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return 1;
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}
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/* See gdb_bfd.h. */
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int
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gdb_bfd_crc (struct bfd *abfd, unsigned long *crc_out)
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{
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struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
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if (!gdata->crc_computed)
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gdata->crc_computed = get_file_crc (abfd, &gdata->crc);
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if (gdata->crc_computed)
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*crc_out = gdata->crc;
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return gdata->crc_computed;
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}
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/* See gdb_bfd.h. */
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bfd *
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gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
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int fd)
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{
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bfd *result = bfd_fopen (filename, target, mode, fd);
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if (result)
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gdb_bfd_ref (result);
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return result;
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}
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/* See gdb_bfd.h. */
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bfd *
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gdb_bfd_openr (const char *filename, const char *target)
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{
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bfd *result = bfd_openr (filename, target);
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if (result)
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gdb_bfd_ref (result);
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return result;
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}
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/* See gdb_bfd.h. */
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bfd *
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gdb_bfd_openw (const char *filename, const char *target)
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{
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bfd *result = bfd_openw (filename, target);
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if (result)
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gdb_bfd_ref (result);
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return result;
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}
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/* See gdb_bfd.h. */
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bfd *
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gdb_bfd_openr_iovec (const char *filename, const char *target,
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void *(*open_func) (struct bfd *nbfd,
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void *open_closure),
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void *open_closure,
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file_ptr (*pread_func) (struct bfd *nbfd,
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void *stream,
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void *buf,
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file_ptr nbytes,
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file_ptr offset),
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int (*close_func) (struct bfd *nbfd,
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void *stream),
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int (*stat_func) (struct bfd *abfd,
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void *stream,
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struct stat *sb))
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{
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bfd *result = bfd_openr_iovec (filename, target,
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open_func, open_closure,
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pread_func, close_func, stat_func);
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if (result)
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gdb_bfd_ref (result);
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return result;
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}
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/* See gdb_bfd.h. */
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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 = 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 = 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) + 1;
|
||
else if (section == bfd_und_section_ptr)
|
||
return bfd_count_sections (abfd) + 2;
|
||
else if (section == bfd_abs_section_ptr)
|
||
return bfd_count_sections (abfd) + 3;
|
||
else if (section == bfd_ind_section_ptr)
|
||
return bfd_count_sections (abfd) + 4;
|
||
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 = 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 = *slot;
|
||
struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
|
||
struct ui_out *uiout = 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);
|
||
}
|