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42 lines
1.3 KiB
ArmAsm
42 lines
1.3 KiB
ArmAsm
/* bzero -- set a block of memory to zero. 64 bit S/390 version.
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This file is part of the GNU C Library.
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Copyright (C) 2001-2016 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* INPUT PARAMETERS
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%r2 = address of memory area
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%r3 = number of bytes to fill. */
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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(__bzero)
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ltgr %r3,%r3
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jz .L1
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sgr %r1,%r1 # set pad byte to zero
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sgr %r4,%r4 # no source for MVCLE, only a pad byte
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sgr %r5,%r5
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.L0: mvcle %r2,%r4,0(%r1) # thats it, MVCLE is your friend
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jo .L0
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.L1: br %r14
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END(__bzero)
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#ifndef NO_WEAK_ALIAS
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weak_alias (__bzero, bzero)
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#endif
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