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/* FreeBSD-specific methods for using the /proc file system.

   Copyright 2002 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "gdbcore.h"

#include "inferior.h"

#include "gdb_string.h"

#include <sys/procfs.h>

#include <sys/types.h>

#include "elf-bfd.h"

#include "gregset.h"

char *

child_pid_to_exec_file (int pid)

{

  char *path;

  char *buf;

  xasprintf (&path, "/proc/%d/file", pid);

  buf = xcalloc (MAXPATHLEN, sizeof (char));

  make_cleanup (xfree, path);

  make_cleanup (xfree, buf);

  if (readlink (path, buf, MAXPATHLEN) > 0)

    return buf;

  return NULL;

}

static int

read_mapping (FILE *mapfile,

              unsigned long *start,

              unsigned long *end,

              char *protection)

{

  int resident, privateresident;

  unsigned long obj;

  int ref_count, shadow_count;

  unsigned flags;

  char cow[5], access[4];

  char type[8];

  int ret;

  /* The layout is described in /usr/src/miscfs/procfs/procfs_map.c.  */

  ret = fscanf (mapfile, "%lx %lx %d %d %lx %s %d %d %x %s %s %s\n",

                start, end,

                &resident, &privateresident, &obj,

                protection,

                &ref_count, &shadow_count, &flags, cow, access, type);

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

}

static 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;

  xasprintf (&mapfilename, "/proc/%ld/map", (long) pid);

  mapfile = fopen (mapfilename, "r");

  if (mapfile == NULL)

    error ("Couldn't open %s\n", mapfilename);

  if (info_verbose)

    fprintf_filtered (gdb_stdout,

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

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

  while (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 0x%s (%c%c%c)\n",

                            size, paddr_nz (start),

                            read ? 'r' : '-',

                            write ? 'w' : '-',

                            exec ? 'x' : '-');

        }

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

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

    }

  fclose (mapfile);

  return 0;

}

static char *

fbsd_make_corefile_notes (bfd *obfd, int *note_size)

{

  gregset_t gregs;

  fpregset_t fpregs;

  char *note_data = NULL;

  fill_gregset (&gregs, -1);

  note_data = (char *) elfcore_write_prstatus (obfd,

                                               note_data,

                                               note_size,

                                               ptid_get_pid (inferior_ptid),

                                               stop_signal,

                                               &gregs);

  fill_fpregset (&fpregs, -1);

  note_data = (char *) 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 = (char *) elfcore_write_prpsinfo (obfd,

                                                   note_data,

                                                   note_size,

                                                   fname,

                                                   psargs);

    }

  make_cleanup (xfree, note_data);

  return note_data;

}

void

_initialize_fbsd_proc (void)

{

  extern void inftarg_set_find_memory_regions ();

  extern void inftarg_set_make_corefile_notes ();

  inftarg_set_find_memory_regions (fbsd_find_memory_regions);

  inftarg_set_make_corefile_notes (fbsd_make_corefile_notes);

}