1/* 2 * Copyright (c) 1983 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 18#if defined(LIBC_SCCS) && !defined(lint) 19 .asciz "@(#)bcopy.s 5.5 (Berkeley) 06/27/88" 20#endif /* LIBC_SCCS and not lint */ 21 22/* bcopy(from, to, size) */ 23 24#include "DEFS.h" 25 26ENTRY(bcopy, R6) 27 movl 4(ap),r1 28 movl 8(ap),r3 29 movl 12(ap),r6 30 cmpl r1,r3 31 bgtr 2f # normal forward case 32 blss 3f # overlapping, must do backwards 33 ret # equal, nothing to do 341: 35 subl2 r0,r6 36 movc3 r0,(r1),(r3) 372: 38 movzwl $65535,r0 39 cmpl r6,r0 40 jgtr 1b 41 movc3 r6,(r1),(r3) 42 ret 433: 44 addl2 r6,r1 45 addl2 r6,r3 46 movzwl $65535,r0 47 jbr 5f 484: 49 subl2 r0,r6 50 subl2 r0,r1 51 subl2 r0,r3 52 movc3 r0,(r1),(r3) 53 movzwl $65535,r0 54 subl2 r0,r1 55 subl2 r0,r3 565: 57 cmpl r6,r0 58 jgtr 4b 59 subl2 r6,r1 60 subl2 r6,r3 61 movc3 r6,(r1),(r3) 62 ret 63