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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sparc/] [lib/] [strlen_user.S] - Blame information for rev 3

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/* strlen_user.S: Sparc 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 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */
 
#define LO_MAGIC 0x01010101
#define HI_MAGIC 0x80808080
 
10:
        ldub    [%o0], %o5
        cmp     %o5, 0
        be      1f
         add    %o0, 1, %o0
        andcc   %o0, 3, %g0
        be      4f
         or     %o4, %lo(HI_MAGIC), %o3
11:
        ldub    [%o0], %o5
        cmp     %o5, 0
        be      2f
         add    %o0, 1, %o0
        andcc   %o0, 3, %g0
        be      5f
         sethi  %hi(LO_MAGIC), %o4
12:
        ldub    [%o0], %o5
        cmp     %o5, 0
        be      3f
         add    %o0, 1, %o0
        b       13f
         or     %o4, %lo(LO_MAGIC), %o2
1:
        retl
         mov    1, %o0
2:
        retl
         mov    2, %o0
3:
        retl
         mov    3, %o0
 
        .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
        bne     10b
         sethi  %hi(HI_MAGIC), %o4
        or      %o4, %lo(HI_MAGIC), %o3
4:
        sethi   %hi(LO_MAGIC), %o4
5:
        or      %o4, %lo(LO_MAGIC), %o2
13:
        ld      [%o0], %o5
2:
        sub     %o5, %o2, %o4
        andcc   %o4, %o3, %g0
        bne     82f
         add    %o0, 4, %o0
        sub     %o0, %o1, %g2
81:     cmp     %g2, %g1
        blu     13b
         mov    %o0, %o4
        ba,a    1f
 
        /* Check every byte. */
82:     srl     %o5, 24, %g5
        andcc   %g5, 0xff, %g0
        be      1f
         add    %o0, -3, %o4
        srl     %o5, 16, %g5
        andcc   %g5, 0xff, %g0
        be      1f
         add    %o4, 1, %o4
        srl     %o5, 8, %g5
        andcc   %g5, 0xff, %g0
        be      1f
         add    %o4, 1, %o4
        andcc   %o5, 0xff, %g0
        bne     81b
         sub    %o0, %o1, %g2
 
        add     %o4, 1, %o4
1:
        retl
         sub    %o4, %o1, %o0
 
        .section .fixup,#alloc,#execinstr
        .align  4
9:
        retl
         clr    %o0
 
        .section __ex_table,#alloc
        .align  4
 
        .word   10b, 9b
        .word   11b, 9b
        .word   12b, 9b
        .word   13b, 9b

Line No.	Rev	Author	Line
1	3	xianfeng	`/* strlen_user.S: Sparc optimized strlen_user code`
2			`*`
3			`* Return length of string in userspace including terminating 0`
4			`* or 0 for error`
5			`*`
6			`* Copyright (C) 1991,1996 Free Software Foundation`
7			`* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)`
8			`* Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)`
9			`*/`
10
11			`#define LO_MAGIC 0x01010101`
12			`#define HI_MAGIC 0x80808080`
13
14			`10:`
15			`ldub [%o0], %o5`
16			`cmp %o5, 0`
17			`be 1f`
18			`add %o0, 1, %o0`
19			`andcc %o0, 3, %g0`
20			`be 4f`
21			`or %o4, %lo(HI_MAGIC), %o3`
22			`11:`
23			`ldub [%o0], %o5`
24			`cmp %o5, 0`
25			`be 2f`
26			`add %o0, 1, %o0`
27			`andcc %o0, 3, %g0`
28			`be 5f`
29			`sethi %hi(LO_MAGIC), %o4`
30			`12:`
31			`ldub [%o0], %o5`
32			`cmp %o5, 0`
33			`be 3f`
34			`add %o0, 1, %o0`
35			`b 13f`
36			`or %o4, %lo(LO_MAGIC), %o2`
37			`1:`
38			`retl`
39			`mov 1, %o0`
40			`2:`
41			`retl`
42			`mov 2, %o0`
43			`3:`
44			`retl`
45			`mov 3, %o0`
46
47			`.align 4`
48			`.global __strlen_user, __strnlen_user`
49			`__strlen_user:`
50			`sethi %hi(32768), %o1`
51			`__strnlen_user:`
52			`mov %o1, %g1`
53			`mov %o0, %o1`
54			`andcc %o0, 3, %g0`
55			`bne 10b`
56			`sethi %hi(HI_MAGIC), %o4`
57			`or %o4, %lo(HI_MAGIC), %o3`
58			`4:`
59			`sethi %hi(LO_MAGIC), %o4`
60			`5:`
61			`or %o4, %lo(LO_MAGIC), %o2`
62			`13:`
63			`ld [%o0], %o5`
64			`2:`
65			`sub %o5, %o2, %o4`
66			`andcc %o4, %o3, %g0`
67			`bne 82f`
68			`add %o0, 4, %o0`
69			`sub %o0, %o1, %g2`
70			`81: cmp %g2, %g1`
71			`blu 13b`
72			`mov %o0, %o4`
73			`ba,a 1f`
74
75			`/* Check every byte. */`
76			`82: srl %o5, 24, %g5`
77			`andcc %g5, 0xff, %g0`
78			`be 1f`
79			`add %o0, -3, %o4`
80			`srl %o5, 16, %g5`
81			`andcc %g5, 0xff, %g0`
82			`be 1f`
83			`add %o4, 1, %o4`
84			`srl %o5, 8, %g5`
85			`andcc %g5, 0xff, %g0`
86			`be 1f`
87			`add %o4, 1, %o4`
88			`andcc %o5, 0xff, %g0`
89			`bne 81b`
90			`sub %o0, %o1, %g2`
91
92			`add %o4, 1, %o4`
93			`1:`
94			`retl`
95			`sub %o4, %o1, %o0`
96
97			`.section .fixup,#alloc,#execinstr`
98			`.align 4`
99			`9:`
100			`retl`
101			`clr %o0`
102
103			`.section __ex_table,#alloc`
104			`.align 4`
105
106			`.word 10b, 9b`
107			`.word 11b, 9b`
108			`.word 12b, 9b`
109			`.word 13b, 9b`

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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sparc/] [lib/] [strlen_user.S] - Blame information for rev 3