42 lines
1.5 KiB
ArmAsm
42 lines
1.5 KiB
ArmAsm
/* Set a block of memory to some byte value. For IBM S390
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/*
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* R2 = address to destination memory area
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* R3 = address to source memory area
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* R4 = number of bytes to copy
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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.text
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ENTRY(memcpy)
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ltr %r5,%r4
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jz .L1
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lr %r4,%r3 # %r4/%r5 = source ptr/len
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lr %r3,%r5 # %r2/%r3 = dest ptr/len
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lr %r0,%r2 # save source address
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.L0: mvcle %r2,%r4,0 # thats it, MVCLE is your friend
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jo .L0
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lr %r2,%r0 # return value is source address
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.L1:
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br %r14
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END(memset)
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