65 lines
1.7 KiB
ArmAsm
65 lines
1.7 KiB
ArmAsm
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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.asciz "@(#)bcopy.s 5.6 (Berkeley) 6/1/90"
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#endif /* LIBC_SCCS and not lint */
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/* bcopy(from, to, size) */
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#include "DEFS.h"
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ENTRY(bcopy, R6)
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movl 4(ap),r1
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movl 8(ap),r3
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movl 12(ap),r6
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cmpl r1,r3
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bgtr 2f # normal forward case
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blss 3f # overlapping, must do backwards
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ret # equal, nothing to do
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1:
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subl2 r0,r6
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movc3 r0,(r1),(r3)
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2:
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movzwl $65535,r0
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cmpl r6,r0
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jgtr 1b
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movc3 r6,(r1),(r3)
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ret
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3:
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addl2 r6,r1
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addl2 r6,r3
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movzwl $65535,r0
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jbr 5f
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4:
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subl2 r0,r6
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subl2 r0,r1
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subl2 r0,r3
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movc3 r0,(r1),(r3)
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movzwl $65535,r0
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subl2 r0,r1
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subl2 r0,r3
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5:
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cmpl r6,r0
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jgtr 4b
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subl2 r6,r1
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subl2 r6,r3
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movc3 r6,(r1),(r3)
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ret
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