1/* Target-specific functions for ARM running under NetBSD.
2
3   Copyright 2002, 2003, 2004 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 2 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, write to the Free Software
19   Foundation, Inc., 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22#include "defs.h"
23#include "osabi.h"
24
25#include "gdb_string.h"
26
27#include "arm-tdep.h"
28#include "nbsd-tdep.h"
29#include "solib-svr4.h"
30
31/* Description of the longjmp buffer.  */
32#define ARM_NBSD_JB_PC 24
33#define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
34
35/* For compatibility with previous implemenations of GDB on arm/NetBSD,
36   override the default little-endian breakpoint.  */
37static const char arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
38static const char arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
39static const char arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
40static const char arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
41
42static int
43arm_netbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
44{
45  if (strcmp (name, "_PROCEDURE_LINKAGE_TABLE_") == 0)
46    return 1;
47
48  return 0;
49}
50
51static void
52arm_netbsd_init_abi_common (struct gdbarch_info info,
53			    struct gdbarch *gdbarch)
54{
55  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
56
57  tdep->lowest_pc = 0x8000;
58  switch (info.byte_order)
59    {
60    case BFD_ENDIAN_LITTLE:
61      tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
62      tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
63      tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
64      tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
65      break;
66
67    case BFD_ENDIAN_BIG:
68      tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
69      tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
70      tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
71      tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
72      break;
73
74    default:
75      internal_error (__FILE__, __LINE__,
76		      "arm_gdbarch_init: bad byte order for float format");
77    }
78
79  tdep->jb_pc = ARM_NBSD_JB_PC;
80  tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
81}
82
83static void
84arm_netbsd_aout_init_abi (struct gdbarch_info info,
85			  struct gdbarch *gdbarch)
86{
87  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
88
89  arm_netbsd_init_abi_common (info, gdbarch);
90
91  set_gdbarch_in_solib_call_trampoline
92    (gdbarch, arm_netbsd_aout_in_solib_call_trampoline);
93  tdep->fp_model = ARM_FLOAT_SOFT_FPA;
94}
95
96static void
97arm_netbsd_elf_init_abi (struct gdbarch_info info,
98			 struct gdbarch *gdbarch)
99{
100  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
101
102  arm_netbsd_init_abi_common (info, gdbarch);
103
104  set_solib_svr4_fetch_link_map_offsets (gdbarch,
105                                nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
106
107  tdep->fp_model = ARM_FLOAT_SOFT_VFP;
108}
109
110static enum gdb_osabi
111arm_netbsd_aout_osabi_sniffer (bfd *abfd)
112{
113  if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
114    return GDB_OSABI_NETBSD_AOUT;
115
116  return GDB_OSABI_UNKNOWN;
117}
118
119void
120_initialize_arm_netbsd_tdep (void)
121{
122  gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_aout_flavour,
123				  arm_netbsd_aout_osabi_sniffer);
124
125  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_AOUT,
126                          arm_netbsd_aout_init_abi);
127  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_ELF,
128                          arm_netbsd_elf_init_abi);
129}
130