70 lines
2.5 KiB
ArmAsm
70 lines
2.5 KiB
ArmAsm
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/* bcopy -- copy a block from source to destination. For IBM S390
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This file is part of the GNU C Library.
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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 of source
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* R3 = address of destination
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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(__bcopy)
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clr %r2,%r3 # check against destructive overlap
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jnl .L0
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lr %r1,%r2
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alr %r1,%r4
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clr %r1,%r3
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jh .L2
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.L0:
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lr %r5,%r4 # source length
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lr %r4,%r2 # source address
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sr %r1,%r1 # set pad byte to zero
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lr %r2,%r3 # set destination
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lr %r3,%r5 # destination length = source length
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.L1: mvcle %r2,%r4,0(%r1) # thats it, MVCLE is your friend
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jo .L1
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br %r14
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.L2: # destructive overlay, can not use mvcle
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lr %r1,%r2 # bcopy is called with source,dest
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lr %r2,%r3 # memmove with dest,source! Oh, well...
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lr %r3,%r1
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basr %r1,0
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.L3:
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#ifdef PIC
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al %r1,.L4-.L3(%r1) # get address of global offset table
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# load address of memmove
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l %r1,memmove@GOT12(%r1)
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br %r1
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.L4: .long _GLOBAL_OFFSET_TABLE_-.L3
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#else
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al %r1,.L4-.L3(%r1) # load address of memmove
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br %r1 # jump to memmove
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.L4: .long memmove-.L3
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#endif
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END(__bcopy)
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#ifndef NO_WEAK_ALIAS
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weak_alias (__bcopy, bcopy)
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#endif
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