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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [sparc64/] [lib/] [strlen_user.S] - Blame information for rev 1765

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Line No.	Rev	Author	Line
1	1275	phoenix	`/* strlen_user.S: Sparc64 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) 1996,1999 David S. Miller (davem@redhat.com)`
8			`* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)`
9			`*/`
10
11			`#include`
12
13			`#define LO_MAGIC 0x01010101`
14			`#define HI_MAGIC 0x80808080`
15
16			`.align 4`
17			`.global __strlen_user, __strnlen_user`
18			`__strlen_user:`
19			`sethi %hi(32768), %o1`
20			`__strnlen_user:`
21			`mov %o1, %g1`
22			`mov %o0, %o1`
23			`andcc %o0, 3, %g0`
24			`be,pt %icc, 9f`
25			`sethi %hi(HI_MAGIC), %o4`
26			`10: lduba [%o0] %asi, %o5`
27			`brz,pn %o5, 21f`
28			`add %o0, 1, %o0`
29			`andcc %o0, 3, %g0`
30			`be,pn %icc, 4f`
31			`or %o4, %lo(HI_MAGIC), %o3`
32			`11: lduba [%o0] %asi, %o5`
33			`brz,pn %o5, 22f`
34			`add %o0, 1, %o0`
35			`andcc %o0, 3, %g0`
36			`be,pt %icc, 13f`
37			`srl %o3, 7, %o2`
38			`12: lduba [%o0] %asi, %o5`
39			`brz,pn %o5, 23f`
40			`add %o0, 1, %o0`
41			`ba,pt %icc, 2f`
42			`15: lda [%o0] %asi, %o5`
43			`9: or %o4, %lo(HI_MAGIC), %o3`
44			`4: srl %o3, 7, %o2`
45			`13: lda [%o0] %asi, %o5`
46			`2: sub %o5, %o2, %o4`
47			`andcc %o4, %o3, %g0`
48			`bne,pn %icc, 82f`
49			`add %o0, 4, %o0`
50			`sub %o0, %o1, %g2`
51			`81: cmp %g2, %g1`
52			`blu,pt %icc, 13b`
53			`mov %o0, %o4`
54			`ba,a,pt %xcc, 1f`
55
56			`/* Check every byte. */`
57			`82: srl %o5, 24, %g5`
58			`andcc %g5, 0xff, %g0`
59			`be,pn %icc, 1f`
60			`add %o0, -3, %o4`
61			`srl %o5, 16, %g5`
62			`andcc %g5, 0xff, %g0`
63			`be,pn %icc, 1f`
64			`add %o4, 1, %o4`
65			`srl %o5, 8, %g5`
66			`andcc %g5, 0xff, %g0`
67			`be,pn %icc, 1f`
68			`add %o4, 1, %o4`
69			`andcc %o5, 0xff, %g0`
70			`bne,pt %icc, 81b`
71			`sub %o0, %o1, %g2`
72			`add %o4, 1, %o4`
73			`1: retl`
74			`sub %o4, %o1, %o0`
75			`21: retl`
76			`mov 1, %o0`
77			`22: retl`
78			`mov 2, %o0`
79			`23: retl`
80			`mov 3, %o0`
81
82			`.section .fixup,#alloc,#execinstr`
83			`.align 4`
84			`30:`
85			`retl`
86			`clr %o0`
87
88			`.section __ex_table,#alloc`
89			`.align 4`
90
91			`.word 10b, 30b`
92			`.word 11b, 30b`
93			`.word 12b, 30b`
94			`.word 15b, 30b`
95			`.word 13b, 30b`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [sparc64/] [lib/] [strlen_user.S] - Blame information for rev 1765