Commit | Line | Data |
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1da177e4 LT |
1 | /* 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 <asm/asi.h> | |
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, %g7 | |
58 | andcc %g7, 0xff, %g0 | |
59 | be,pn %icc, 1f | |
60 | add %o0, -3, %o4 | |
61 | srl %o5, 16, %g7 | |
62 | andcc %g7, 0xff, %g0 | |
63 | be,pn %icc, 1f | |
64 | add %o4, 1, %o4 | |
65 | srl %o5, 8, %g7 | |
66 | andcc %g7, 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 | ||
4d000d5b | 88 | .section __ex_table,"a" |
1da177e4 LT |
89 | .align 4 |
90 | ||
91 | .word 10b, 30b | |
92 | .word 11b, 30b | |
93 | .word 12b, 30b | |
94 | .word 15b, 30b | |
95 | .word 13b, 30b |