140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/* Native-dependent code for FreeBSD.
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Copyright (C) 2002-2014 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 "gdbcore.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "regset.h"
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#include "gdbthread.h"
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#include <sys/types.h>
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#include <sys/procfs.h>
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#include <sys/sysctl.h>
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#include "elf-bfd.h"
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#include "fbsd-nat.h"
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/* Return the name of a file that can be opened to get the symbols for
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the child process identified by PID. */
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char *
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fbsd_pid_to_exec_file (struct target_ops *self, int pid)
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{
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ssize_t len = PATH_MAX;
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static char buf[PATH_MAX];
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char name[PATH_MAX];
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#ifdef KERN_PROC_PATHNAME
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int mib[4];
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PATHNAME;
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mib[3] = pid;
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if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
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return buf;
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#endif
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xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
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len = readlink (name, buf, PATH_MAX - 1);
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if (len != -1)
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{
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buf[len] = '\0';
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return buf;
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}
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return NULL;
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}
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static int
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fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
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char *protection)
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{
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/* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */
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char buf[256];
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int resident, privateresident;
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unsigned long obj;
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int ret = EOF;
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/* As of FreeBSD 5.0-RELEASE, the layout is described in
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/usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a
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new column was added to the procfs map. Therefore we can't use
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fscanf since we need to support older releases too. */
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if (fgets (buf, sizeof buf, mapfile) != NULL)
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ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,
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&resident, &privateresident, &obj, protection);
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return (ret != 0 && ret != EOF);
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}
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/* Iterate over all the memory regions in the current inferior,
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calling FUNC for each memory region. OBFD is passed as the last
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argument to FUNC. */
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int
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fbsd_find_memory_regions (struct target_ops *self,
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find_memory_region_ftype func, void *obfd)
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{
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pid_t pid = ptid_get_pid (inferior_ptid);
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char *mapfilename;
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FILE *mapfile;
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unsigned long start, end, size;
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char protection[4];
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int read, write, exec;
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struct cleanup *cleanup;
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mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
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cleanup = make_cleanup (xfree, mapfilename);
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mapfile = fopen (mapfilename, "r");
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if (mapfile == NULL)
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error (_("Couldn't open %s."), mapfilename);
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make_cleanup_fclose (mapfile);
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if (info_verbose)
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fprintf_filtered (gdb_stdout,
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"Reading memory regions from %s\n", mapfilename);
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/* Now iterate until end-of-file. */
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while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
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{
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size = end - start;
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read = (strchr (protection, 'r') != 0);
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write = (strchr (protection, 'w') != 0);
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exec = (strchr (protection, 'x') != 0);
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if (info_verbose)
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{
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fprintf_filtered (gdb_stdout,
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"Save segment, %ld bytes at %s (%c%c%c)\n",
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size, paddress (target_gdbarch (), start),
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read ? 'r' : '-',
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write ? 'w' : '-',
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exec ? 'x' : '-');
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}
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/* Invoke the callback function to create the corefile segment.
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Pass MODIFIED as true, we do not know the real modification state. */
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func (start, size, read, write, exec, 1, obfd);
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}
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do_cleanups (cleanup);
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return 0;
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}
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