about summary refs log tree commit diff
path: root/sysdeps/s390/s390-32/memset.S
blob: 00e908278e443295ca94f042b3159ebb2d001681 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
/* Set a block of memory to some byte value.  For IBM S390
   Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).

   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/>.  */

/*
 * R2 = address to memory area
 * R3 = byte to fill memory with
 * R4 = number of bytes to fill
 */

#include "sysdep.h"
#include "asm-syntax.h"

	.text
ENTRY(memset)
	ltr     %r4,%r4
	jz      .L1
	lr      %r0,%r2             # save source address
	lr      %r1,%r3             # move pad byte to R1
	lr      %r3,%r4
	sr      %r4,%r4             # no source for MVCLE, only a pad byte
	sr      %r5,%r5
.L0:    mvcle   %r2,%r4,0(%r1)      # thats it, MVCLE is your friend
	jo      .L0
	lr      %r2,%r0             # return value is source address
.L1:
	br      %r14
END(memset)
libc_hidden_builtin_def (memset)