| /* 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, 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) |
| libc_hidden_builtin_def (memset) |
