1/* Target-dependent code for NetBSD/arm.
2
3   Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
20#include "defs.h"
21#include "osabi.h"
22
23#include "gdb_string.h"
24
25#include "arm-tdep.h"
26#include "solib-svr4.h"
27
28/* Description of the longjmp buffer.  */
29#define ARM_NBSD_JB_PC 24
30#define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
31
32/* For compatibility with previous implemenations of GDB on arm/NetBSD,
33   override the default little-endian breakpoint.  */
34static const char arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
35static const char arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
36static const char arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
37static const char arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
38
39static void
40arm_netbsd_init_abi_common (struct gdbarch_info info,
41			    struct gdbarch *gdbarch)
42{
43  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
44
45  tdep->lowest_pc = 0x8000;
46  switch (info.byte_order)
47    {
48    case BFD_ENDIAN_LITTLE:
49      tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
50      tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
51      tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
52      tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
53      break;
54
55    case BFD_ENDIAN_BIG:
56      tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
57      tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
58      tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
59      tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
60      break;
61
62    default:
63      internal_error (__FILE__, __LINE__,
64		      _("arm_gdbarch_init: bad byte order for float format"));
65    }
66
67  tdep->jb_pc = ARM_NBSD_JB_PC;
68  tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
69
70  /* Single stepping.  */
71  set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
72}
73
74static void
75arm_netbsd_aout_init_abi (struct gdbarch_info info,
76			  struct gdbarch *gdbarch)
77{
78  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
79
80  arm_netbsd_init_abi_common (info, gdbarch);
81  if (tdep->fp_model == ARM_FLOAT_AUTO)
82    tdep->fp_model = ARM_FLOAT_SOFT_FPA;
83}
84
85static void
86arm_netbsd_elf_init_abi (struct gdbarch_info info,
87			 struct gdbarch *gdbarch)
88{
89  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
90
91  arm_netbsd_init_abi_common (info, gdbarch);
92  if (tdep->fp_model == ARM_FLOAT_AUTO)
93    tdep->fp_model = ARM_FLOAT_SOFT_VFP;
94
95  /* NetBSD ELF uses SVR4-style shared libraries.  */
96  set_solib_svr4_fetch_link_map_offsets
97    (gdbarch, svr4_ilp32_fetch_link_map_offsets);
98}
99
100static enum gdb_osabi
101arm_netbsd_aout_osabi_sniffer (bfd *abfd)
102{
103  if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
104    return GDB_OSABI_NETBSD_AOUT;
105
106  return GDB_OSABI_UNKNOWN;
107}
108
109void
110_initialize_arm_netbsd_tdep (void)
111{
112  gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_aout_flavour,
113				  arm_netbsd_aout_osabi_sniffer);
114
115  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_AOUT,
116                          arm_netbsd_aout_init_abi);
117  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_ELF,
118                          arm_netbsd_elf_init_abi);
119}
120