mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-01 17:30:07 +00:00
82 lines
2.3 KiB
ArmAsm
82 lines
2.3 KiB
ArmAsm
/* memcpy - copy a block from source to destination. 64 bit S/390 version.
|
|
Copyright (C) 2012-2016 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. */
|
|
|
|
|
|
.text
|
|
|
|
#ifdef USE_MULTIARCH
|
|
ENTRY(__memcpy_default)
|
|
#else
|
|
ENTRY(memcpy)
|
|
#endif
|
|
.machine "z900"
|
|
ltgr %r4,%r4
|
|
je .L_Z900_4
|
|
aghi %r4,-1
|
|
srlg %r5,%r4,8
|
|
ltgr %r5,%r5
|
|
lgr %r1,%r2
|
|
jne .L_Z900_13
|
|
.L_Z900_3:
|
|
larl %r5,.L_Z900_15
|
|
ex %r4,0(%r5)
|
|
.L_Z900_4:
|
|
br %r14
|
|
.L_Z900_13:
|
|
chi %r5,4096 # Switch to mvcle for copies >1MB
|
|
jh __memcpy_mvcle
|
|
.L_Z900_12:
|
|
mvc 0(256,%r1),0(%r3)
|
|
la %r1,256(%r1)
|
|
la %r3,256(%r3)
|
|
brctg %r5,.L_Z900_12
|
|
j .L_Z900_3
|
|
.L_Z900_15:
|
|
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.
|
|
aghi %r4,1 # length + 1
|
|
lgr %r5,%r4 # source length
|
|
lgr %r4,%r3 # source address
|
|
lgr %r3,%r5 # destination length = source length
|
|
.L_MVCLE_1:
|
|
mvcle %r2,%r4,0 # thats it, MVCLE is your friend
|
|
jo .L_MVCLE_1
|
|
lgr %r2,%r1 # return destination address
|
|
br %r14
|
|
END(__memcpy_mvcle)
|