2005-04-16 15:20:36 -07:00
|
|
|
/* $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
|
|
|
|
|
|
2006-03-04 23:23:56 -08:00
|
|
|
.section __ex_table,"a"
|
2005-04-16 15:20:36 -07:00
|
|
|
.align 4
|
2005-09-28 20:41:45 -07:00
|
|
|
.word 60b, __retl_efault
|
|
|
|
|
.word 61b, __retl_efault
|
|
|
|
|
.word 62b, __retl_efault
|
|
|
|
|
.word 63b, __retl_efault
|
|
|
|
|
.word 64b, __retl_efault
|
|
|
|
|
.previous
|
