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83 lines
2.4 KiB
ArmAsm
83 lines
2.4 KiB
ArmAsm
/* memcpy - copy a block from source to destination. S/390 version.
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Copyright (C) 2012-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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#include "sysdep.h"
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#include "asm-syntax.h"
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/* INPUT PARAMETERS
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%r2 = address of destination memory area
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%r3 = address of source memory area
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%r4 = number of bytes to copy. */
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#ifdef USE_MULTIARCH
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ENTRY(__memcpy_default)
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#else
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ENTRY(memcpy)
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#endif
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.machine "g5"
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st %r13,52(%r15)
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.cfi_offset 13, -44
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basr %r13,0
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.L_G5_16:
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ltr %r4,%r4
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je .L_G5_4
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ahi %r4,-1
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lr %r5,%r4
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srl %r5,8
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ltr %r5,%r5
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lr %r1,%r2
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jne .L_G5_12
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ex %r4,.L_G5_17-.L_G5_16(%r13)
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.L_G5_4:
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l %r13,52(%r15)
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br %r14
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.L_G5_13:
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chi %r5,4096 # Switch to mvcle for copies >1MB
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jh __memcpy_mvcle
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.L_G5_12:
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mvc 0(256,%r1),0(%r3)
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la %r1,256(%r1)
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la %r3,256(%r3)
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brct %r5,.L_G5_12
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ex %r4,.L_G5_17-.L_G5_16(%r13)
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j .L_G5_4
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.L_G5_17:
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mvc 0(1,%r1),0(%r3)
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#ifdef USE_MULTIARCH
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END(__memcpy_default)
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#else
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END(memcpy)
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libc_hidden_builtin_def (memcpy)
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#endif
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ENTRY(__memcpy_mvcle)
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# Using as standalone function will result in unexpected
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# results since the length field is incremented by 1 in order to
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# compensate the changes already done in the functions above.
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ahi %r4,1 # length + 1
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lr %r5,%r4 # source length
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lr %r4,%r3 # source address
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lr %r3,%r5 # destination length = source length
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.L_MVCLE_1:
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mvcle %r2,%r4,0 # thats it, MVCLE is your friend
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jo .L_MVCLE_1
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lr %r2,%r1 # return destination address
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br %r14
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END(__memcpy_mvcle)
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