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/* Target-dependent code for OSF/1 on Alpha.

   Copyright (C) 2002, 2003, 2007, 2008 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 "frame.h"

#include "gdbcore.h"

#include "value.h"

#include "osabi.h"

#include "gdb_string.h"

#include "objfiles.h"

#include "alpha-tdep.h"

static int

alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name)

{

  return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0);

}

static CORE_ADDR

alpha_osf1_sigcontext_addr (struct frame_info *next_frame)

{

  const struct frame_id next_id = get_frame_id (next_frame);

  return (read_memory_integer (next_id.stack_addr, 8));

}

static void

alpha_osf1_init_abi (struct gdbarch_info info,

                     struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Hook into the MDEBUG frame unwinder.  */

  alpha_mdebug_init_abi (info, gdbarch);

  /* The next/step support via procfs on OSF1 is broken when running

     on multi-processor machines. We need to use software single stepping

     instead.  */

  set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);

  tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;

  tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp;

  tdep->jb_pc = 2;

  tdep->jb_elt_size = 8;

}

void

_initialize_alpha_osf1_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,

                          alpha_osf1_init_abi);

}