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/* Return whether PC is in a BSD sigtramp routine.  */
36
37int
38i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
39{
40  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
41
42  return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
43}
44
45/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
46   routine, return the address of the associated sigcontext structure.  */
47
48static CORE_ADDR
49i386bsd_sigcontext_addr (struct frame_info *next_frame)
50{
51  char buf[4];
52  CORE_ADDR sp;
53
54  frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
55  sp = extract_unsigned_integer (buf, 4);
56
57  return read_memory_unsigned_integer (sp + 8, 4);
58}
59
60/* Return the start address of the sigtramp routine.  */
61
62CORE_ADDR
63i386bsd_sigtramp_start (CORE_ADDR pc)
64{
65  return gdbarch_tdep (current_gdbarch)->sigtramp_start;
66}
67
68/* Return the end address of the sigtramp routine.  */
69
70CORE_ADDR
71i386bsd_sigtramp_end (CORE_ADDR pc)
72{
73  return gdbarch_tdep (current_gdbarch)->sigtramp_end;
74}
75
76
77/* Support for shared libraries.  */
78
79/* Return non-zero if we are in a shared library trampoline code stub.  */
80
81int
82i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
83{
84  return (name && !strcmp (name, "_DYNAMIC"));
85}
86
87/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD).  */
88
89/* From <machine/signal.h>.  */
90int i386bsd_sc_reg_offset[] =
91{
92  -1,				/* %eax */
93  -1,				/* %ecx */
94  -1,				/* %edx */
95  -1,				/* %ebx */
96  8 + 0 * 4,			/* %esp */
97  8 + 1 * 4,			/* %ebp */
98  -1,				/* %esi */
99  -1,				/* %edi */
100  8 + 3 * 4,			/* %eip */
101  8 + 4 * 4,			/* %eflags */
102  -1,				/* %cs */
103  -1,				/* %ss */
104  -1,				/* %ds */
105  -1,				/* %es */
106  -1,				/* %fs */
107  -1				/* %gs */
108};
109
110void
111i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
112{
113  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
114
115  set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);
116
117  /* Allow the recognition of sigtramps as a function named <sigtramp>.  */
118  set_gdbarch_sigtramp_start (gdbarch, i386bsd_sigtramp_start);
119  set_gdbarch_sigtramp_end (gdbarch, i386bsd_sigtramp_end);
120
121  /* Assume SunOS-style shared libraries.  */
122  set_gdbarch_in_solib_call_trampoline (gdbarch,
123					i386bsd_aout_in_solib_call_trampoline);
124
125  tdep->jb_pc_offset = 0;
126
127  tdep->sigtramp_start = 0xfdbfdfc0;
128  tdep->sigtramp_end = 0xfdbfe000;
129  tdep->sigcontext_addr = i386bsd_sigcontext_addr;
130  tdep->sc_reg_offset = i386bsd_sc_reg_offset;
131  tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
132}
133
134
135static enum gdb_osabi
136i386bsd_aout_osabi_sniffer (bfd *abfd)
137{
138  if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
139    return GDB_OSABI_NETBSD_AOUT;
140
141  if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
142    return GDB_OSABI_FREEBSD_AOUT;
143
144  return GDB_OSABI_UNKNOWN;
145}
146
147static enum gdb_osabi
148i386bsd_core_osabi_sniffer (bfd *abfd)
149{
150  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
151    return GDB_OSABI_NETBSD_AOUT;
152
153  return GDB_OSABI_UNKNOWN;
154}
155
156
157/* Provide a prototype to silence -Wmissing-prototypes.  */
158void _initialize_i386bsd_tdep (void);
159
160void
161_initialize_i386bsd_tdep (void)
162{
163  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
164				  i386bsd_aout_osabi_sniffer);
165
166  /* BFD doesn't set the architecture for NetBSD style a.out core
167     files.  */
168  gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_unknown_flavour,
169				  i386bsd_core_osabi_sniffer);
170}
171