diff options
Diffstat (limited to 'arch/sparc64/lib/strncpy_from_user.S')
| -rw-r--r-- | arch/sparc64/lib/strncpy_from_user.S | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/arch/sparc64/lib/strncpy_from_user.S b/arch/sparc64/lib/strncpy_from_user.S new file mode 100644 index 00000000000..09cbbaa0ebf --- /dev/null +++ b/arch/sparc64/lib/strncpy_from_user.S @@ -0,0 +1,139 @@ +/* $Id: strncpy_from_user.S,v 1.6 1999/05/25 16:53:05 jj Exp $ + * strncpy_from_user.S: Sparc64 strncpy from userspace. + * + * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz) + */ + +#include <asm/asi.h> +#include <asm/errno.h> + + .data + .align 8 +0: .xword 0x0101010101010101 + + .text + .align 32 + + /* Must return: + * + * -EFAULT for an exception + * count if we hit the buffer limit + * bytes copied if we hit a null byte + * (without the null byte) + * + * This implementation assumes: + * %o1 is 8 aligned => !(%o2 & 7) + * %o0 is 8 aligned (if not, it will be slooooow, but will work) + * + * This is optimized for the common case: + * in my stats, 90% of src are 8 aligned (even on sparc32) + * and average length is 18 or so. + */ + + .globl __strncpy_from_user + .type __strncpy_from_user,#function +__strncpy_from_user: + /* %o0=dest, %o1=src, %o2=count */ + andcc %o1, 7, %g0 ! IEU1 Group + bne,pn %icc, 30f ! CTI + add %o0, %o2, %g3 ! IEU0 +60: ldxa [%o1] %asi, %g1 ! Load Group + brlez,pn %o2, 10f ! CTI + mov %o0, %o3 ! IEU0 +50: sethi %hi(0b), %o4 ! IEU0 Group + ldx [%o4 + %lo(0b)], %o4 ! Load + sllx %o4, 7, %o5 ! IEU1 Group +1: sub %g1, %o4, %g2 ! IEU0 Group + stx %g1, [%o0] ! Store + add %o0, 8, %o0 ! IEU1 + andcc %g2, %o5, %g0 ! IEU1 Group + bne,pn %xcc, 5f ! CTI + add %o1, 8, %o1 ! IEU0 + cmp %o0, %g3 ! IEU1 Group + bl,a,pt %xcc, 1b ! CTI +61: ldxa [%o1] %asi, %g1 ! Load +10: retl ! CTI Group + mov %o2, %o0 ! IEU0 +5: srlx %g2, 32, %g7 ! IEU0 Group + sethi %hi(0xff00), %o4 ! IEU1 + andcc %g7, %o5, %g0 ! IEU1 Group + be,pn %icc, 2f ! CTI + or %o4, %lo(0xff00), %o4 ! IEU0 + srlx %g1, 48, %g7 ! IEU0 Group + andcc %g7, %o4, %g0 ! IEU1 Group + be,pn %icc, 50f ! CTI + andcc %g7, 0xff, %g0 ! IEU1 Group + be,pn %icc, 51f ! CTI + srlx %g1, 32, %g7 ! IEU0 + andcc %g7, %o4, %g0 ! IEU1 Group + be,pn %icc, 52f ! CTI + andcc %g7, 0xff, %g0 ! IEU1 Group + be,pn %icc, 53f ! CTI +2: andcc %g2, %o5, %g0 ! IEU1 Group + be,pn %icc, 2f ! CTI + srl %g1, 16, %g7 ! IEU0 + andcc %g7, %o4, %g0 ! IEU1 Group + be,pn %icc, 54f ! CTI + andcc %g7, 0xff, %g0 ! IEU1 Group + be,pn %icc, 55f ! CTI + andcc %g1, %o4, %g0 ! IEU1 Group + be,pn %icc, 56f ! CTI + andcc %g1, 0xff, %g0 ! IEU1 Group + be,a,pn %icc, 57f ! CTI + sub %o0, %o3, %o0 ! IEU0 +2: cmp %o0, %g3 ! IEU1 Group + bl,a,pt %xcc, 50b ! CTI +62: ldxa [%o1] %asi, %g1 ! Load + retl ! CTI Group + mov %o2, %o0 ! IEU0 +50: sub %o0, %o3, %o0 + retl + sub %o0, 8, %o0 +51: sub %o0, %o3, %o0 + retl + sub %o0, 7, %o0 +52: sub %o0, %o3, %o0 + retl + sub %o0, 6, %o0 +53: sub %o0, %o3, %o0 + retl + sub %o0, 5, %o0 +54: sub %o0, %o3, %o0 + retl + sub %o0, 4, %o0 +55: sub %o0, %o3, %o0 + retl + sub %o0, 3, %o0 +56: sub %o0, %o3, %o0 + retl + sub %o0, 2, %o0 +57: retl + sub %o0, 1, %o0 +30: brlez,pn %o2, 3f + sub %g0, %o2, %o3 + add %o0, %o2, %o0 +63: lduba [%o1] %asi, %o4 +1: add %o1, 1, %o1 + brz,pn %o4, 2f + stb %o4, [%o0 + %o3] + addcc %o3, 1, %o3 + bne,pt %xcc, 1b +64: lduba [%o1] %asi, %o4 +3: retl + mov %o2, %o0 +2: retl + add %o2, %o3, %o0 + .size __strncpy_from_user, .-__strncpy_from_user + + .section .fixup,#alloc,#execinstr + .align 4 +4: retl + mov -EFAULT, %o0 + + .section __ex_table,#alloc + .align 4 + .word 60b, 4b + .word 61b, 4b + .word 62b, 4b + .word 63b, 4b + .word 64b, 4b |