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847b055c | 1 | /* Set a block of memory to some byte value. For IBM S390 |
85dd1003 | 2 | Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc. |
41bdb6e2 | 3 | This file is part of the GNU C Library. |
847b055c AJ |
4 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
847b055c AJ |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
847b055c | 15 | |
41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
847b055c AJ |
20 | |
21 | /* | |
22 | * R2 = address to memory area | |
23 | * R3 = byte to fill memory with | |
24 | * R4 = number of bytes to fill | |
25 | */ | |
26 | ||
27 | #include "sysdep.h" | |
28 | #include "asm-syntax.h" | |
29 | ||
30 | .text | |
31 | ENTRY(memset) | |
32 | ltr %r4,%r4 | |
33 | jz .L1 | |
34 | lr %r0,%r2 # save source address | |
35 | lr %r1,%r3 # move pad byte to R1 | |
36 | lr %r3,%r4 | |
37 | sr %r4,%r4 # no source for MVCLE, only a pad byte | |
38 | sr %r5,%r5 | |
39 | .L0: mvcle %r2,%r4,0(%r1) # thats it, MVCLE is your friend | |
40 | jo .L0 | |
41 | lr %r2,%r0 # return value is source address | |
42 | .L1: | |
43 | br %r14 | |
44 | END(memset) | |
85dd1003 | 45 | libc_hidden_builtin_def (memset) |