1/* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Computer Consoles Inc. 9 */ 10 11#if defined(LIBC_SCCS) && !defined(lint) 12 .asciz "@(#)memmove.s 8.1 (Berkeley) 06/04/93" 13#endif /* LIBC_SCCS and not lint */ 14 15/* void *memmove(to, from, size) */ 16#include "DEFS.h" 17 18ENTRY(memmove, 0) 19 movl 4(fp),r1 20 movl 8(fp),r0 21 movl 12(fp),r2 22 cmpl r0,r1 23 bgtru 1f /* normal forward case */ 24 beql 2f /* equal, nothing to do */ 25 addl2 r2,r0 /* may be overlapping */ 26 cmpl r0,r1 27 bgtru 3f 28 subl2 r2,r0 /* normal forward case */ 291: 30 movblk 312: 32 movl 4(fp),r0 /* this can probably be optimised */ 33 ret 343: 35 addl2 r2,r1 /* overlapping, must do backwards */ 36 subl3 r0,r1,r3 37 movl r2,r4 38 jbr 5f 394: 40 subl2 r3,r0 41 subl2 r3,r1 42 movl r3,r2 43 movblk 44 subl2 r3,r0 45 subl2 r3,r1 46 subl2 r3,r4 475: 48 cmpl r4,r3 49 jgtr 4b 50 movl r4,r2 51 subl2 r2,r0 52 subl2 r2,r1 53 movblk 54 movl 4(fp),r0 55 ret 56