1/* Target-dependent code for OSF/1 on Alpha.
2   Copyright 2002, 2003 Free Software Foundation, Inc.
3
4   This file is part of GDB.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software
18   Foundation, Inc., 59 Temple Place - Suite 330,
19   Boston, MA 02111-1307, USA.  */
20
21#include "defs.h"
22#include "frame.h"
23#include "gdbcore.h"
24#include "value.h"
25#include "osabi.h"
26#include "gdb_string.h"
27#include "objfiles.h"
28
29#include "alpha-tdep.h"
30
31static int
32alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
33{
34  return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0);
35}
36
37static CORE_ADDR
38alpha_osf1_sigcontext_addr (struct frame_info *frame)
39{
40  struct frame_info *next_frame = get_next_frame (frame);
41
42  if (next_frame != NULL)
43    return (read_memory_integer (get_frame_base (next_frame), 8));
44  else
45    return (read_memory_integer (get_frame_base (frame), 8));
46}
47
48static void
49alpha_osf1_init_abi (struct gdbarch_info info,
50                     struct gdbarch *gdbarch)
51{
52  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
53
54  /* Hook into the MDEBUG frame unwinder.  */
55  alpha_mdebug_init_abi (info, gdbarch);
56
57  /* The next/step support via procfs on OSF1 is broken when running
58     on multi-processor machines. We need to use software single stepping
59     instead.  */
60  set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
61
62  tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
63  tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp;
64
65  tdep->jb_pc = 2;
66  tdep->jb_elt_size = 8;
67}
68
69void
70_initialize_alpha_osf1_tdep (void)
71{
72  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,
73			  alpha_osf1_init_abi);
74}
75