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/* memcpy - copy a block from source to destination. S/390 version.
Copyright (C) 2012-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<http://www.gnu.org/licenses/>. */
#include "sysdep.h"
#include "asm-syntax.h"
/* INPUT PARAMETERS
%r2 = address of destination memory area
%r3 = address of source memory area
%r4 = number of bytes to copy. */
#ifdef USE_MULTIARCH
ENTRY(__memcpy_default)
#else
ENTRY(memcpy)
#endif
.machine "g5"
st %r13,52(%r15)
.cfi_offset 13, -44
basr %r13,0
.L_G5_16:
ltr %r4,%r4
je .L_G5_4
ahi %r4,-1
lr %r5,%r4
srl %r5,8
ltr %r5,%r5
lr %r1,%r2
jne .L_G5_12
ex %r4,.L_G5_17-.L_G5_16(%r13)
.L_G5_4:
l %r13,52(%r15)
br %r14
.L_G5_13:
chi %r5,4096 # Switch to mvcle for copies >1MB
jh __memcpy_mvcle
.L_G5_12:
mvc 0(256,%r1),0(%r3)
la %r1,256(%r1)
la %r3,256(%r3)
brct %r5,.L_G5_12
ex %r4,.L_G5_17-.L_G5_16(%r13)
j .L_G5_4
.L_G5_17:
mvc 0(1,%r1),0(%r3)
#ifdef USE_MULTIARCH
END(__memcpy_default)
#else
END(memcpy)
libc_hidden_builtin_def (memcpy)
#endif
ENTRY(__memcpy_mvcle)
# Using as standalone function will result in unexpected
# results since the length field is incremented by 1 in order to
# compensate the changes already done in the functions above.
ahi %r4,1 # length + 1
lr %r5,%r4 # source length
lr %r4,%r3 # source address
lr %r3,%r5 # destination length = source length
.L_MVCLE_1:
mvcle %r2,%r4,0 # thats it, MVCLE is your friend
jo .L_MVCLE_1
lr %r2,%r1 # return destination address
br %r14
END(__memcpy_mvcle)
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