1 /* Low-level siginfo manipulation for amd64.
3 Copyright (C) 2016 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #ifndef AMD64_LINUX_SIGINFO_H
21 #define AMD64_LINUX_SIGINFO_H 1
23 /* When GDB is built as a 64-bit application on Linux, the
24 PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
25 debugging a 32-bit inferior with a 64-bit GDB should look the same
26 as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
27 conversion in-place ourselves.
28 In other to make this conversion independent of the system where gdb
29 is compiled the most complete version of the siginfo, named as native
30 siginfo, is used internally as an intermediate step.
32 Conversion using nat_siginfo is exemplified below:
33 compat_siginfo_from_siginfo or compat_x32_siginfo_from_siginfo
35 buffer (from the kernel) -> nat_siginfo -> 32 / X32 siginfo
37 siginfo_from_compat_x32_siginfo or siginfo_from_compat_siginfo
39 32 / X32 siginfo -> nat_siginfo -> buffer (to the kernel) */
42 /* Kind of siginfo fixup to be performed. */
44 enum amd64_siginfo_fixup_mode
46 FIXUP_32
= 1, /* Fixup for 32bit. */
47 FIXUP_X32
= 2 /* Fixup for x32. */
50 /* Common code for performing the fixup of the siginfo. */
52 int amd64_linux_siginfo_fixup_common (siginfo_t
*native
, gdb_byte
*inf
,
54 enum amd64_siginfo_fixup_mode mode
);