1/* Target-dependent code for i386 BSD's.
2
3   Copyright 2001, 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 "arch-utils.h"
24#include "frame.h"
25#include "gdbcore.h"
26#include "regcache.h"
27#include "osabi.h"
28
29#include "gdb_string.h"
30
31#include "i386-tdep.h"
32
33/* Support for signal handlers.  */
34
35/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
36   routine, return the address of the associated sigcontext structure.  */
37
38static CORE_ADDR
39i386bsd_sigcontext_addr (struct frame_info *next_frame)
40{
41  char buf[4];
42  CORE_ADDR sp;
43
44  frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
45  sp = extract_unsigned_integer (buf, 4);
46
47  return read_memory_unsigned_integer (sp + 8, 4);
48}
49
50
51/* Support for shared libraries.  */
52
53/* Return non-zero if we are in a shared library trampoline code stub.  */
54
55int
56i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
57{
58  return (name && !strcmp (name, "_DYNAMIC"));
59}
60
61/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD).  */
62
63/* From <machine/signal.h>.  */
64int i386bsd_sc_reg_offset[] =
65{
66  -1,				/* %eax */
67  -1,				/* %ecx */
68  -1,				/* %edx */
69  -1,				/* %ebx */
70  8 + 0 * 4,			/* %esp */
71  8 + 1 * 4,			/* %ebp */
72  -1,				/* %esi */
73  -1,				/* %edi */
74  8 + 3 * 4,			/* %eip */
75  8 + 4 * 4,			/* %eflags */
76  -1,				/* %cs */
77  -1,				/* %ss */
78  -1,				/* %ds */
79  -1,				/* %es */
80  -1,				/* %fs */
81  -1				/* %gs */
82};
83
84void
85i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
86{
87  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
88
89  /* Assume SunOS-style shared libraries.  */
90  set_gdbarch_in_solib_call_trampoline (gdbarch,
91					i386bsd_aout_in_solib_call_trampoline);
92
93  tdep->jb_pc_offset = 0;
94
95  tdep->sigtramp_start = 0xfdbfdfc0;
96  tdep->sigtramp_end = 0xfdbfe000;
97  tdep->sigcontext_addr = i386bsd_sigcontext_addr;
98  tdep->sc_reg_offset = i386bsd_sc_reg_offset;
99  tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
100}
101
102
103static enum gdb_osabi
104i386bsd_aout_osabi_sniffer (bfd *abfd)
105{
106  if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
107    return GDB_OSABI_NETBSD_AOUT;
108
109  if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
110    return GDB_OSABI_FREEBSD_AOUT;
111
112  return GDB_OSABI_UNKNOWN;
113}
114
115static enum gdb_osabi
116i386bsd_core_osabi_sniffer (bfd *abfd)
117{
118  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
119    return GDB_OSABI_NETBSD_AOUT;
120
121  return GDB_OSABI_UNKNOWN;
122}
123
124
125/* Provide a prototype to silence -Wmissing-prototypes.  */
126void _initialize_i386bsd_tdep (void);
127
128void
129_initialize_i386bsd_tdep (void)
130{
131  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
132				  i386bsd_aout_osabi_sniffer);
133
134  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
135  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
136				  i386bsd_core_osabi_sniffer);
137}
138