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/* Native-dependent code for FreeBSD.

   Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009, 2010

   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 "gdbcore.h"

#include "inferior.h"

#include "regcache.h"

#include "regset.h"

#include "gdbthread.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include <sys/types.h>

#include <sys/procfs.h>

#include <sys/sysctl.h>

#include "elf-bfd.h"

#include "fbsd-nat.h"

/* Return a the name of file that can be opened to get the symbols for

   the child process identified by PID.  */

char *

fbsd_pid_to_exec_file (int pid)

{

  size_t len = MAXPATHLEN;

  char *buf = xcalloc (len, sizeof (char));

  char *path;

#ifdef KERN_PROC_PATHNAME

  int mib[4];

  mib[0] = CTL_KERN;

  mib[1] = KERN_PROC;

  mib[2] = KERN_PROC_PATHNAME;

  mib[3] = pid;

  if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)

    return buf;

#endif

  path = xstrprintf ("/proc/%d/file", pid);

  if (readlink (path, buf, MAXPATHLEN) == -1)

    {

      xfree (buf);

      buf = NULL;

    }

  xfree (path);

  return buf;

}

static int

fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,

                   char *protection)

{

  /* FreeBSD 5.1-RELEASE uses a 256-byte buffer.  */

  char buf[256];

  int resident, privateresident;

  unsigned long obj;

  int ret = EOF;

  /* As of FreeBSD 5.0-RELEASE, the layout is described in

     /usr/src/sys/fs/procfs/procfs_map.c.  Somewhere in 5.1-CURRENT a

     new column was added to the procfs map.  Therefore we can't use

     fscanf since we need to support older releases too.  */

  if (fgets (buf, sizeof buf, mapfile) != NULL)

    ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end,

                  &resident, &privateresident, &obj, protection);

  return (ret != 0 && ret != EOF);

}

/* Iterate over all the memory regions in the current inferior,

   calling FUNC for each memory region.  OBFD is passed as the last

   argument to FUNC.  */

int

fbsd_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,

                                       int, int, int, void *),

                          void *obfd)

{

  pid_t pid = ptid_get_pid (inferior_ptid);

  char *mapfilename;

  FILE *mapfile;

  unsigned long start, end, size;

  char protection[4];

  int read, write, exec;

  struct cleanup *cleanup;

  mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);

  cleanup = make_cleanup (xfree, mapfilename);

  mapfile = fopen (mapfilename, "r");

  if (mapfile == NULL)

    error (_("Couldn't open %s."), mapfilename);

  make_cleanup_fclose (mapfile);

  if (info_verbose)

    fprintf_filtered (gdb_stdout,

                      "Reading memory regions from %s\n", mapfilename);

  /* Now iterate until end-of-file.  */

  while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))

    {

      size = end - start;

      read = (strchr (protection, 'r') != 0);

      write = (strchr (protection, 'w') != 0);

      exec = (strchr (protection, 'x') != 0);

      if (info_verbose)

        {

          fprintf_filtered (gdb_stdout,

                            "Save segment, %ld bytes at %s (%c%c%c)\n",

                            size, paddress (target_gdbarch, start),

                            read ? 'r' : '-',

                            write ? 'w' : '-',

                            exec ? 'x' : '-');

        }

      /* Invoke the callback function to create the corefile segment. */

      func (start, size, read, write, exec, obfd);

    }

  do_cleanups (cleanup);

  return 0;

}

static int

find_signalled_thread (struct thread_info *info, void *data)

{

  if (info->stop_signal != TARGET_SIGNAL_0

      && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))

    return 1;

  return 0;

}

static enum target_signal

find_stop_signal (void)

{

  struct thread_info *info =

    iterate_over_threads (find_signalled_thread, NULL);

  if (info)

    return info->stop_signal;

  else

    return TARGET_SIGNAL_0;

}

/* Create appropriate note sections for a corefile, returning them in

   allocated memory.  */

char *

fbsd_make_corefile_notes (bfd *obfd, int *note_size)

{

  const struct regcache *regcache = get_current_regcache ();

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  gregset_t gregs;

  fpregset_t fpregs;

  char *note_data = NULL;

  Elf_Internal_Ehdr *i_ehdrp;

  const struct regset *regset;

  size_t size;

  /* Put a "FreeBSD" label in the ELF header.  */

  i_ehdrp = elf_elfheader (obfd);

  i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;

  gdb_assert (gdbarch_regset_from_core_section_p (gdbarch));

  size = sizeof gregs;

  regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size);

  gdb_assert (regset && regset->collect_regset);

  regset->collect_regset (regset, regcache, -1, &gregs, size);

  note_data = elfcore_write_prstatus (obfd, note_data, note_size,

                                      ptid_get_pid (inferior_ptid),

                                      find_stop_signal (), &gregs);

  size = sizeof fpregs;

  regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size);

  gdb_assert (regset && regset->collect_regset);

  regset->collect_regset (regset, regcache, -1, &fpregs, size);

  note_data = elfcore_write_prfpreg (obfd, note_data, note_size,

                                     &fpregs, sizeof (fpregs));

  if (get_exec_file (0))

    {

      char *fname = strrchr (get_exec_file (0), '/') + 1;

      char *psargs = xstrdup (fname);

      if (get_inferior_args ())

        psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL);

      note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,

                                          fname, psargs);

    }

  make_cleanup (xfree, note_data);

  return note_data;

}