1/* Copyright (C) 2010-2021 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library.  If not, see
16   <https://www.gnu.org/licenses/>.  */
17
18/* When this file is built for inclusion in nscd, _FORTIFY_SOURCE is
19   defined but -O is not used, resulting in a warning from features.h.  */
20#undef _FORTIFY_SOURCE
21#include <sysdep.h>
22
23/* Out-of-line syscall stub.  We expect the system call number in ip
24   and return the raw result in r0.  No registers are clobbered.
25   We could avoid using the stack for this, but the goal is accurate
26   unwind information - and while there is a reserved prefix in the
27   ARM unwind tables for register to register moves, the actual opcodes
28   are not defined.  */
29
30#if defined(__thumb__)
31	.thumb
32	.syntax unified
33	.hidden __libc_do_syscall
34
35#undef CALL_MCOUNT
36#define CALL_MCOUNT
37
38ENTRY (__libc_do_syscall)
39	.fnstart
40	push	{r7, lr}
41	.save	{r7, lr}
42	cfi_adjust_cfa_offset (8)
43	cfi_rel_offset (r7, 0)
44	cfi_rel_offset (lr, 4)
45	mov	r7, ip
46	swi	0x0
47	pop	{r7, pc}
48	.fnend
49END (__libc_do_syscall)
50
51#endif /* __thumb__ */
52