1 /* Target-dependent code for i386 BSD's.
2
3 Copyright (C) 2001-2013 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 THIS_FRAME is for a BSD sigtramp routine, return the
34 address of the associated sigcontext structure. */
35
36 static CORE_ADDR
i386bsd_sigcontext_addr(struct frame_info * this_frame)37 i386bsd_sigcontext_addr (struct frame_info *this_frame)
38 {
39 struct gdbarch *gdbarch = get_frame_arch (this_frame);
40 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
41 gdb_byte buf[4];
42 CORE_ADDR sp;
43
44 get_frame_register (this_frame, I386_ESP_REGNUM, buf);
45 sp = extract_unsigned_integer (buf, 4, byte_order);
46
47 return read_memory_unsigned_integer (sp + 8, 4, byte_order);
48 }
49
50
51 /* Support for shared libraries. */
52
53 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
54
55 /* From <machine/signal.h>. */
56 int i386bsd_sc_reg_offset[] =
57 {
58 -1, /* %eax */
59 -1, /* %ecx */
60 -1, /* %edx */
61 -1, /* %ebx */
62 8 + 0 * 4, /* %esp */
63 8 + 1 * 4, /* %ebp */
64 -1, /* %esi */
65 -1, /* %edi */
66 8 + 3 * 4, /* %eip */
67 8 + 4 * 4, /* %eflags */
68 -1, /* %cs */
69 -1, /* %ss */
70 -1, /* %ds */
71 -1, /* %es */
72 -1, /* %fs */
73 -1 /* %gs */
74 };
75
76 void
i386bsd_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)77 i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
78 {
79 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
80
81 tdep->jb_pc_offset = 0;
82
83 tdep->sigtramp_start = 0xfdbfdfc0;
84 tdep->sigtramp_end = 0xfdbfe000;
85 tdep->sigcontext_addr = i386bsd_sigcontext_addr;
86 tdep->sc_reg_offset = i386bsd_sc_reg_offset;
87 tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
88 }
89
90
91 static enum gdb_osabi
i386bsd_aout_osabi_sniffer(bfd * abfd)92 i386bsd_aout_osabi_sniffer (bfd *abfd)
93 {
94 if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
95 return GDB_OSABI_NETBSD_AOUT;
96
97 if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
98 return GDB_OSABI_FREEBSD_AOUT;
99
100 return GDB_OSABI_UNKNOWN;
101 }
102
103 static enum gdb_osabi
i386bsd_core_osabi_sniffer(bfd * abfd)104 i386bsd_core_osabi_sniffer (bfd *abfd)
105 {
106 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
107 return GDB_OSABI_NETBSD_AOUT;
108
109 return GDB_OSABI_UNKNOWN;
110 }
111
112
113 /* Provide a prototype to silence -Wmissing-prototypes. */
114 void _initialize_i386bsd_tdep (void);
115
116 void
_initialize_i386bsd_tdep(void)117 _initialize_i386bsd_tdep (void)
118 {
119 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
120 i386bsd_aout_osabi_sniffer);
121
122 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
123 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
124 i386bsd_core_osabi_sniffer);
125 }
126