96 lines
1.8 KiB
ArmAsm
96 lines
1.8 KiB
ArmAsm
/* strlen_user.S: Sparc64 optimized strlen_user code
|
|
*
|
|
* Return length of string in userspace including terminating 0
|
|
* or 0 for error
|
|
*
|
|
* Copyright (C) 1991,1996 Free Software Foundation
|
|
* Copyright (C) 1996,1999 David S. Miller (davem@redhat.com)
|
|
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
*/
|
|
|
|
#include <asm/asi.h>
|
|
|
|
#define LO_MAGIC 0x01010101
|
|
#define HI_MAGIC 0x80808080
|
|
|
|
.align 4
|
|
.global __strlen_user, __strnlen_user
|
|
__strlen_user:
|
|
sethi %hi(32768), %o1
|
|
__strnlen_user:
|
|
mov %o1, %g1
|
|
mov %o0, %o1
|
|
andcc %o0, 3, %g0
|
|
be,pt %icc, 9f
|
|
sethi %hi(HI_MAGIC), %o4
|
|
10: lduba [%o0] %asi, %o5
|
|
brz,pn %o5, 21f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be,pn %icc, 4f
|
|
or %o4, %lo(HI_MAGIC), %o3
|
|
11: lduba [%o0] %asi, %o5
|
|
brz,pn %o5, 22f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be,pt %icc, 13f
|
|
srl %o3, 7, %o2
|
|
12: lduba [%o0] %asi, %o5
|
|
brz,pn %o5, 23f
|
|
add %o0, 1, %o0
|
|
ba,pt %icc, 2f
|
|
15: lda [%o0] %asi, %o5
|
|
9: or %o4, %lo(HI_MAGIC), %o3
|
|
4: srl %o3, 7, %o2
|
|
13: lda [%o0] %asi, %o5
|
|
2: sub %o5, %o2, %o4
|
|
andcc %o4, %o3, %g0
|
|
bne,pn %icc, 82f
|
|
add %o0, 4, %o0
|
|
sub %o0, %o1, %g2
|
|
81: cmp %g2, %g1
|
|
blu,pt %icc, 13b
|
|
mov %o0, %o4
|
|
ba,a,pt %xcc, 1f
|
|
|
|
/* Check every byte. */
|
|
82: srl %o5, 24, %g7
|
|
andcc %g7, 0xff, %g0
|
|
be,pn %icc, 1f
|
|
add %o0, -3, %o4
|
|
srl %o5, 16, %g7
|
|
andcc %g7, 0xff, %g0
|
|
be,pn %icc, 1f
|
|
add %o4, 1, %o4
|
|
srl %o5, 8, %g7
|
|
andcc %g7, 0xff, %g0
|
|
be,pn %icc, 1f
|
|
add %o4, 1, %o4
|
|
andcc %o5, 0xff, %g0
|
|
bne,pt %icc, 81b
|
|
sub %o0, %o1, %g2
|
|
add %o4, 1, %o4
|
|
1: retl
|
|
sub %o4, %o1, %o0
|
|
21: retl
|
|
mov 1, %o0
|
|
22: retl
|
|
mov 2, %o0
|
|
23: retl
|
|
mov 3, %o0
|
|
|
|
.section .fixup,#alloc,#execinstr
|
|
.align 4
|
|
30:
|
|
retl
|
|
clr %o0
|
|
|
|
.section __ex_table,"a"
|
|
.align 4
|
|
|
|
.word 10b, 30b
|
|
.word 11b, 30b
|
|
.word 12b, 30b
|
|
.word 15b, 30b
|
|
.word 13b, 30b
|