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i386-bsd-tdep.c
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1/* Target-dependent code for i386 BSD's.
2
3 Copyright (C) 2001-2023 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 "i386-tdep.h"
28
29/* Support for signal handlers. */
30
31/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
32 address of the associated sigcontext structure. */
33
34static CORE_ADDR
36{
37 struct gdbarch *gdbarch = get_frame_arch (this_frame);
38 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
39 gdb_byte buf[4];
40 CORE_ADDR sp;
41
42 get_frame_register (this_frame, I386_ESP_REGNUM, buf);
43 sp = extract_unsigned_integer (buf, 4, byte_order);
44
45 return read_memory_unsigned_integer (sp + 8, 4, byte_order);
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>. */
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
76{
77 i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
78
79 tdep->jb_pc_offset = 0;
80
81 tdep->sigtramp_start = 0xfdbfdfc0;
82 tdep->sigtramp_end = 0xfdbfe000;
85 tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
86}
87
88
ULONGEST read_memory_unsigned_integer(CORE_ADDR memaddr, int len, enum bfd_endian byte_order)
Definition corefile.c:306
static ULONGEST extract_unsigned_integer(gdb::array_view< const gdb_byte > buf, enum bfd_endian byte_order)
Definition defs.h:480
void get_frame_register(frame_info_ptr frame, int regnum, gdb_byte *buf)
Definition frame.c:1263
struct gdbarch * get_frame_arch(frame_info_ptr this_frame)
Definition frame.c:3027
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition gdbarch.c:1396
int i386bsd_sc_reg_offset[]
static CORE_ADDR i386bsd_sigcontext_addr(frame_info_ptr this_frame)
void i386bsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
@ I386_ESP_REGNUM
Definition i386-tdep.h:285
info(Component c)
Definition gdbarch.py:41
CORE_ADDR sigtramp_end
Definition i386-tdep.h:227
CORE_ADDR sigtramp_start
Definition i386-tdep.h:226
CORE_ADDR(* sigcontext_addr)(frame_info_ptr)
Definition i386-tdep.h:233