1/* memmove.S: Simple memmove implementation. 2 * 3 * Copyright (C) 1997, 2004 David S. Miller (davem@redhat.com) 4 * Copyright (C) 1996, 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz) 5 */ 6 7#include <linux/linkage.h> 8#include <asm/export.h> 9 10 .text 11ENTRY(memmove) /* o0=dst o1=src o2=len */ 12 brz,pn %o2, 99f 13 mov %o0, %g1 14 15 cmp %o0, %o1 16 bleu,pt %xcc, 2f 17 add %o1, %o2, %g7 18 cmp %g7, %o0 19 bleu,pt %xcc, memcpy 20 add %o0, %o2, %o5 21 sub %g7, 1, %o1 22 23 sub %o5, 1, %o0 241: ldub [%o1], %g7 25 subcc %o2, 1, %o2 26 sub %o1, 1, %o1 27 stb %g7, [%o0] 28 bne,pt %icc, 1b 29 sub %o0, 1, %o0 3099: 31 retl 32 mov %g1, %o0 33 34 /* We can't just call memcpy for these memmove cases. On some 35 * chips the memcpy uses cache initializing stores and when dst 36 * and src are close enough, those can clobber the source data 37 * before we've loaded it in. 38 */ 392: or %o0, %o1, %g7 40 or %o2, %g7, %g7 41 andcc %g7, 0x7, %g0 42 bne,pn %xcc, 4f 43 nop 44 453: ldx [%o1], %g7 46 add %o1, 8, %o1 47 subcc %o2, 8, %o2 48 add %o0, 8, %o0 49 bne,pt %icc, 3b 50 stx %g7, [%o0 - 0x8] 51 ba,a,pt %xcc, 99b 52 534: ldub [%o1], %g7 54 add %o1, 1, %o1 55 subcc %o2, 1, %o2 56 add %o0, 1, %o0 57 bne,pt %icc, 4b 58 stb %g7, [%o0 - 0x1] 59 ba,a,pt %xcc, 99b 60ENDPROC(memmove) 61EXPORT_SYMBOL(memmove) 62