1/* Target-dependent code for i386 BSD's.
2
3   Copyright (C) 2001, 2002, 2003, 2004, 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 "arch-utils.h"
22#include "frame.h"
23#include "gdbcore.h"
24#include "regcache.h"
25#include "osabi.h"
26
27#include "gdb_string.h"
28
29#include "i386-tdep.h"
30
31/* Support for signal handlers.  */
32
33/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
34   routine, return the address of the associated sigcontext structure.  */
35
36static CORE_ADDR
37i386bsd_sigcontext_addr (struct frame_info *next_frame)
38{
39  gdb_byte buf[4];
40  CORE_ADDR sp;
41
42  frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
43  sp = extract_unsigned_integer (buf, 4);
44
45  return read_memory_unsigned_integer (sp + 8, 4);
46}
47
48
49/* Support for shared libraries.  */
50
51/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD).  */
52
53/* From <machine/signal.h>.  */
54int i386bsd_sc_reg_offset[] =
55{
56  -1,				/* %eax */
57  -1,				/* %ecx */
58  -1,				/* %edx */
59  -1,				/* %ebx */
60  8 + 0 * 4,			/* %esp */
61  8 + 1 * 4,			/* %ebp */
62  -1,				/* %esi */
63  -1,				/* %edi */
64  8 + 3 * 4,			/* %eip */
65  8 + 4 * 4,			/* %eflags */
66  -1,				/* %cs */
67  -1,				/* %ss */
68  -1,				/* %ds */
69  -1,				/* %es */
70  -1,				/* %fs */
71  -1				/* %gs */
72};
73
74void
75i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
76{
77  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
78
79  tdep->jb_pc_offset = 0;
80
81  tdep->sigtramp_start = 0xfdbfdfc0;
82  tdep->sigtramp_end = 0xfdbfe000;
83  tdep->sigcontext_addr = i386bsd_sigcontext_addr;
84  tdep->sc_reg_offset = i386bsd_sc_reg_offset;
85  tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
86}
87
88
89static enum gdb_osabi
90i386bsd_aout_osabi_sniffer (bfd *abfd)
91{
92  if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
93    return GDB_OSABI_NETBSD_AOUT;
94
95  if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
96    return GDB_OSABI_FREEBSD_AOUT;
97
98  return GDB_OSABI_UNKNOWN;
99}
100
101static enum gdb_osabi
102i386bsd_core_osabi_sniffer (bfd *abfd)
103{
104  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
105    return GDB_OSABI_NETBSD_AOUT;
106
107  return GDB_OSABI_UNKNOWN;
108}
109
110
111/* Provide a prototype to silence -Wmissing-prototypes.  */
112void _initialize_i386bsd_tdep (void);
113
114void
115_initialize_i386bsd_tdep (void)
116{
117  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
118				  i386bsd_aout_osabi_sniffer);
119
120  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
121  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
122				  i386bsd_core_osabi_sniffer);
123}
124