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 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/*
* 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)
|
GitWeb
