Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
8695c37d | 7 | #include <linux/linkage.h> |
d3867f04 | 8 | #include <asm/export.h> |
8695c37d | 9 | |
1da177e4 | 10 | .text |
8695c37d | 11 | ENTRY(memmove) /* o0=dst o1=src o2=len */ |
2077cef4 DM |
12 | brz,pn %o2, 99f |
13 | mov %o0, %g1 | |
14 | ||
1da177e4 | 15 | cmp %o0, %o1 |
2077cef4 | 16 | bleu,pt %xcc, 2f |
1da177e4 LT |
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 | |
24 | 1: 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 | |
2077cef4 | 30 | 99: |
1da177e4 LT |
31 | retl |
32 | mov %g1, %o0 | |
2077cef4 DM |
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 | */ | |
39 | 2: or %o0, %o1, %g7 | |
40 | or %o2, %g7, %g7 | |
41 | andcc %g7, 0x7, %g0 | |
42 | bne,pn %xcc, 4f | |
43 | nop | |
44 | ||
45 | 3: 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 | ||
53 | 4: 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 | |
8695c37d | 60 | ENDPROC(memmove) |
d3867f04 | 61 | EXPORT_SYMBOL(memmove) |