glibc/sysdeps/mach/i386/syscall.S
Samuel Thibault 444eacba82 hurd: Fix stack pointer corruption in syscall
Thanks Justus Winter for the report.

	* sysdeps/mach/i386/syscall.S (syscall): Push back syscall number.
2016-09-22 02:43:39 +02:00

30 lines
1.2 KiB
ArmAsm

/* Copyright (C) 1993-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
ENTRY (syscall)
popl %ecx /* Pop return address into %ecx. */
popl %eax /* Pop syscall number into %eax. */
pushl %ecx /* Push back return address. */
.byte 0x9a, 0, 0, 0, 0, 7, 0 /* lcall $7, $0 -- gas bug */
popl %ecx /* Pop return address into %ecx. */
pushl $0 /* Push back dumb syscall number. */
pushl %ecx /* Push back return address. */
ret
END (syscall)