diff options
Diffstat (limited to 'kernel/arch/sparc/lib/memmove.S')
| -rw-r--r-- | kernel/arch/sparc/lib/memmove.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/arch/sparc/lib/memmove.S b/kernel/arch/sparc/lib/memmove.S new file mode 100644 index 000000000..857ad4f89 --- /dev/null +++ b/kernel/arch/sparc/lib/memmove.S @@ -0,0 +1,59 @@ +/* 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> + + .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) |