1/* 2 * Copyright (c) 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * This code is derived from software contributed to Berkeley by 18 * Computer Consoles Inc. 19 */ 20 21#if defined(LIBC_SCCS) && !defined(lint) 22 .asciz "@(#)bcopy.s 1.3 (Berkeley) 06/27/88" 23#endif /* LIBC_SCCS and not lint */ 24 25/* bcopy(from, to, size) */ 26#include "DEFS.h" 27 28ENTRY(bcopy, 0) 29 movl 4(fp),r0 30 movl 8(fp),r1 31 movl 12(fp),r2 32 cmpl r0,r1 33 bgtru 1f # normal forward case 34 beql 2f # equal, nothing to do 35 addl2 r2,r0 # may be overlapping 36 cmpl r0,r1 37 bgtru 3f 38 subl2 r2,r0 # normal forward case 391: 40 movblk 412: 42 ret 433: 44 addl2 r2,r1 # overlapping, must do backwards 45 subl3 r0,r1,r3 46 movl r2,r4 47 jbr 5f 484: 49 subl2 r3,r0 50 subl2 r3,r1 51 movl r3,r2 52 movblk 53 subl2 r3,r0 54 subl2 r3,r1 55 subl2 r3,r4 565: 57 cmpl r4,r3 58 jgtr 4b 59 movl r4,r2 60 subl2 r2,r0 61 subl2 r2,r1 62 movblk 63 ret 64