1/* Out-of-line syscall stub for six-argument syscalls from C.
2   Copyright (C) 2015-2021 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#include <sysdep.h>
20
21#ifndef OPTIMIZE_FOR_GCC_5
22
23/* %eax, %ecx, %edx and %esi contain the values expected by the kernel.
24   %edi points to a structure with the values of %ebx, %edi and %ebp.  */
25
26	.hidden __libc_do_syscall
27
28ENTRY (__libc_do_syscall)
29	pushl	%ebx
30	cfi_adjust_cfa_offset (4)
31	cfi_rel_offset (ebx, 0)
32	pushl	%edi
33	cfi_adjust_cfa_offset (4)
34	cfi_rel_offset (edi, 0)
35	pushl	%ebp
36	cfi_adjust_cfa_offset (4)
37	cfi_rel_offset (ebp, 0)
38	movl	0(%edi), %ebx
39	movl	8(%edi), %ebp
40	movl	4(%edi), %edi
41	ENTER_KERNEL
42	popl	%ebp
43	cfi_adjust_cfa_offset (-4)
44	cfi_restore (ebp)
45	popl	%edi
46	cfi_adjust_cfa_offset (-4)
47	cfi_restore (edi)
48	popl	%ebx
49	cfi_adjust_cfa_offset (-4)
50	cfi_restore (ebx)
51	ret
52END (__libc_do_syscall)
53#endif
54