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/* Low-level siginfo manipulation for amd64.
Copyright (C) 2016-2022 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef NAT_AMD64_LINUX_SIGINFO_H
#define NAT_AMD64_LINUX_SIGINFO_H
#include <signal.h> /* For siginfo_t. */
/* When GDB is built as a 64-bit application on Linux, the
PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
debugging a 32-bit inferior with a 64-bit GDB should look the same
as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
conversion in-place ourselves.
In other to make this conversion independent of the system where gdb
is compiled the most complete version of the siginfo, named as native
siginfo, is used internally as an intermediate step.
Conversion using nat_siginfo is exemplified below:
compat_siginfo_from_siginfo or compat_x32_siginfo_from_siginfo
buffer (from the kernel) -> nat_siginfo -> 32 / X32 siginfo
siginfo_from_compat_x32_siginfo or siginfo_from_compat_siginfo
32 / X32 siginfo -> nat_siginfo -> buffer (to the kernel) */
/* Kind of siginfo fixup to be performed. */
enum amd64_siginfo_fixup_mode
{
FIXUP_32 = 1, /* Fixup for 32bit. */
FIXUP_X32 = 2 /* Fixup for x32. */
};
/* Common code for performing the fixup of the siginfo. */
int amd64_linux_siginfo_fixup_common (siginfo_t *native, gdb_byte *inf,
int direction,
enum amd64_siginfo_fixup_mode mode);
#endif /* NAT_AMD64_LINUX_SIGINFO_H */
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