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/* Target-dependent code for GNU/Linux, architecture independent.

   Copyright (C) 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 "gdbtypes.h"

#include "linux-tdep.h"

#include "auxv.h"

#include "target.h"

#include "elf/common.h"

/* This function is suitable for architectures that don't

   extend/override the standard siginfo structure.  */

struct type *

linux_get_siginfo_type (struct gdbarch *gdbarch)

{

  struct type *int_type, *uint_type, *long_type, *void_ptr_type;

  struct type *uid_type, *pid_type;

  struct type *sigval_type, *clock_type;

  struct type *siginfo_type, *sifields_type;

  struct type *type;

  int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),

                                0, "int");

  uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),

                                 1, "unsigned int");

  long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch),

                                 0, "long");

  void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);

  /* sival_t */

  sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);

  TYPE_NAME (sigval_type) = xstrdup ("sigval_t");

  append_composite_type_field (sigval_type, "sival_int", int_type);

  append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type);

  /* __pid_t */

  pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (int_type),

                        xstrdup ("__pid_t"));

  TYPE_TARGET_TYPE (pid_type) = int_type;

  TYPE_TARGET_STUB (pid_type) = 1;

  /* __uid_t */

  uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (uint_type),

                        xstrdup ("__uid_t"));

  TYPE_TARGET_TYPE (uid_type) = uint_type;

  TYPE_TARGET_STUB (uid_type) = 1;

  /* __clock_t */

  clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, TYPE_LENGTH (long_type),

                          xstrdup ("__clock_t"));

  TYPE_TARGET_TYPE (clock_type) = long_type;

  TYPE_TARGET_STUB (clock_type) = 1;

  /* _sifields */

  sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);

  {

    const int si_max_size = 128;

    int si_pad_size;

    int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT;

    /* _pad */

    if (gdbarch_ptr_bit (gdbarch) == 64)

      si_pad_size = (si_max_size / size_of_int) - 4;

    else

      si_pad_size = (si_max_size / size_of_int) - 3;

    append_composite_type_field (sifields_type, "_pad",

                                 init_vector_type (int_type, si_pad_size));

  }

  /* _kill */

  type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  append_composite_type_field (type, "si_pid", pid_type);

  append_composite_type_field (type, "si_uid", uid_type);

  append_composite_type_field (sifields_type, "_kill", type);

  /* _timer */

  type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  append_composite_type_field (type, "si_tid", int_type);

  append_composite_type_field (type, "si_overrun", int_type);

  append_composite_type_field (type, "si_sigval", sigval_type);

  append_composite_type_field (sifields_type, "_timer", type);

  /* _rt */

  type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  append_composite_type_field (type, "si_pid", pid_type);

  append_composite_type_field (type, "si_uid", uid_type);

  append_composite_type_field (type, "si_sigval", sigval_type);

  append_composite_type_field (sifields_type, "_rt", type);

  /* _sigchld */

  type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  append_composite_type_field (type, "si_pid", pid_type);

  append_composite_type_field (type, "si_uid", uid_type);

  append_composite_type_field (type, "si_status", int_type);

  append_composite_type_field (type, "si_utime", clock_type);

  append_composite_type_field (type, "si_stime", clock_type);

  append_composite_type_field (sifields_type, "_sigchld", type);

  /* _sigfault */

  type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  append_composite_type_field (type, "si_addr", void_ptr_type);

  append_composite_type_field (sifields_type, "_sigfault", type);

  /* _sigpoll */

  type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  append_composite_type_field (type, "si_band", long_type);

  append_composite_type_field (type, "si_fd", int_type);

  append_composite_type_field (sifields_type, "_sigpoll", type);

  /* struct siginfo */

  siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  TYPE_NAME (siginfo_type) = xstrdup ("siginfo");

  append_composite_type_field (siginfo_type, "si_signo", int_type);

  append_composite_type_field (siginfo_type, "si_errno", int_type);

  append_composite_type_field (siginfo_type, "si_code", int_type);

  append_composite_type_field_aligned (siginfo_type,

                                       "_sifields", sifields_type,

                                       TYPE_LENGTH (long_type));

  return siginfo_type;

}

int

linux_has_shared_address_space (void)

{

  /* Determine whether we are running on uClinux or normal Linux

     kernel.  */

  CORE_ADDR dummy;

  int target_is_uclinux;

  target_is_uclinux

    = (target_auxv_search (&current_target, AT_NULL, &dummy) > 0

       && target_auxv_search (&current_target, AT_PAGESZ, &dummy) == 0);

  return target_is_uclinux;

}