| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* memmove.S: Simple memmove implementation. |
| * |
| * Copyright (C) 1997, 2004 David S. Miller (davem@redhat.com) |
| * Copyright (C) 1996, 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz) |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/export.h> |
| |
| .text |
| ENTRY(memmove) /* o0=dst o1=src o2=len */ |
| brz,pn %o2, 99f |
| mov %o0, %g1 |
| |
| cmp %o0, %o1 |
| bleu,pt %xcc, 2f |
| add %o1, %o2, %g7 |
| cmp %g7, %o0 |
| bleu,pt %xcc, memcpy |
| add %o0, %o2, %o5 |
| sub %g7, 1, %o1 |
| |
| sub %o5, 1, %o0 |
| 1: ldub [%o1], %g7 |
| subcc %o2, 1, %o2 |
| sub %o1, 1, %o1 |
| stb %g7, [%o0] |
| bne,pt %icc, 1b |
| sub %o0, 1, %o0 |
| 99: |
| retl |
| mov %g1, %o0 |
| |
| /* We can't just call memcpy for these memmove cases. On some |
| * chips the memcpy uses cache initializing stores and when dst |
| * and src are close enough, those can clobber the source data |
| * before we've loaded it in. |
| */ |
| 2: or %o0, %o1, %g7 |
| or %o2, %g7, %g7 |
| andcc %g7, 0x7, %g0 |
| bne,pn %xcc, 4f |
| nop |
| |
| 3: ldx [%o1], %g7 |
| add %o1, 8, %o1 |
| subcc %o2, 8, %o2 |
| add %o0, 8, %o0 |
| bne,pt %icc, 3b |
| stx %g7, [%o0 - 0x8] |
| ba,a,pt %xcc, 99b |
| |
| 4: ldub [%o1], %g7 |
| add %o1, 1, %o1 |
| subcc %o2, 1, %o2 |
| add %o0, 1, %o0 |
| bne,pt %icc, 4b |
| stb %g7, [%o0 - 0x1] |
| ba,a,pt %xcc, 99b |
| ENDPROC(memmove) |
| EXPORT_SYMBOL(memmove) |