Commit | Line | Data |
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b00dc837 | 1 | /* |
1da177e4 LT |
2 | * strncpy_from_user.S: Sparc64 strncpy from userspace. |
3 | * | |
4 | * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz) | |
5 | */ | |
6 | ||
8695c37d | 7 | #include <linux/linkage.h> |
1da177e4 LT |
8 | #include <asm/asi.h> |
9 | #include <asm/errno.h> | |
10 | ||
11 | .data | |
12 | .align 8 | |
13 | 0: .xword 0x0101010101010101 | |
14 | ||
15 | .text | |
1da177e4 LT |
16 | |
17 | /* Must return: | |
18 | * | |
19 | * -EFAULT for an exception | |
20 | * count if we hit the buffer limit | |
21 | * bytes copied if we hit a null byte | |
22 | * (without the null byte) | |
23 | * | |
24 | * This implementation assumes: | |
25 | * %o1 is 8 aligned => !(%o2 & 7) | |
26 | * %o0 is 8 aligned (if not, it will be slooooow, but will work) | |
27 | * | |
28 | * This is optimized for the common case: | |
29 | * in my stats, 90% of src are 8 aligned (even on sparc32) | |
30 | * and average length is 18 or so. | |
31 | */ | |
32 | ||
8695c37d | 33 | ENTRY(__strncpy_from_user) |
1da177e4 LT |
34 | /* %o0=dest, %o1=src, %o2=count */ |
35 | andcc %o1, 7, %g0 ! IEU1 Group | |
36 | bne,pn %icc, 30f ! CTI | |
37 | add %o0, %o2, %g3 ! IEU0 | |
38 | 60: ldxa [%o1] %asi, %g1 ! Load Group | |
39 | brlez,pn %o2, 10f ! CTI | |
40 | mov %o0, %o3 ! IEU0 | |
41 | 50: sethi %hi(0b), %o4 ! IEU0 Group | |
42 | ldx [%o4 + %lo(0b)], %o4 ! Load | |
43 | sllx %o4, 7, %o5 ! IEU1 Group | |
44 | 1: sub %g1, %o4, %g2 ! IEU0 Group | |
45 | stx %g1, [%o0] ! Store | |
46 | add %o0, 8, %o0 ! IEU1 | |
47 | andcc %g2, %o5, %g0 ! IEU1 Group | |
48 | bne,pn %xcc, 5f ! CTI | |
49 | add %o1, 8, %o1 ! IEU0 | |
50 | cmp %o0, %g3 ! IEU1 Group | |
51 | bl,a,pt %xcc, 1b ! CTI | |
52 | 61: ldxa [%o1] %asi, %g1 ! Load | |
53 | 10: retl ! CTI Group | |
54 | mov %o2, %o0 ! IEU0 | |
55 | 5: srlx %g2, 32, %g7 ! IEU0 Group | |
56 | sethi %hi(0xff00), %o4 ! IEU1 | |
57 | andcc %g7, %o5, %g0 ! IEU1 Group | |
58 | be,pn %icc, 2f ! CTI | |
59 | or %o4, %lo(0xff00), %o4 ! IEU0 | |
60 | srlx %g1, 48, %g7 ! IEU0 Group | |
61 | andcc %g7, %o4, %g0 ! IEU1 Group | |
62 | be,pn %icc, 50f ! CTI | |
63 | andcc %g7, 0xff, %g0 ! IEU1 Group | |
64 | be,pn %icc, 51f ! CTI | |
65 | srlx %g1, 32, %g7 ! IEU0 | |
66 | andcc %g7, %o4, %g0 ! IEU1 Group | |
67 | be,pn %icc, 52f ! CTI | |
68 | andcc %g7, 0xff, %g0 ! IEU1 Group | |
69 | be,pn %icc, 53f ! CTI | |
70 | 2: andcc %g2, %o5, %g0 ! IEU1 Group | |
71 | be,pn %icc, 2f ! CTI | |
72 | srl %g1, 16, %g7 ! IEU0 | |
73 | andcc %g7, %o4, %g0 ! IEU1 Group | |
74 | be,pn %icc, 54f ! CTI | |
75 | andcc %g7, 0xff, %g0 ! IEU1 Group | |
76 | be,pn %icc, 55f ! CTI | |
77 | andcc %g1, %o4, %g0 ! IEU1 Group | |
78 | be,pn %icc, 56f ! CTI | |
79 | andcc %g1, 0xff, %g0 ! IEU1 Group | |
80 | be,a,pn %icc, 57f ! CTI | |
81 | sub %o0, %o3, %o0 ! IEU0 | |
82 | 2: cmp %o0, %g3 ! IEU1 Group | |
83 | bl,a,pt %xcc, 50b ! CTI | |
84 | 62: ldxa [%o1] %asi, %g1 ! Load | |
85 | retl ! CTI Group | |
86 | mov %o2, %o0 ! IEU0 | |
87 | 50: sub %o0, %o3, %o0 | |
88 | retl | |
89 | sub %o0, 8, %o0 | |
90 | 51: sub %o0, %o3, %o0 | |
91 | retl | |
92 | sub %o0, 7, %o0 | |
93 | 52: sub %o0, %o3, %o0 | |
94 | retl | |
95 | sub %o0, 6, %o0 | |
96 | 53: sub %o0, %o3, %o0 | |
97 | retl | |
98 | sub %o0, 5, %o0 | |
99 | 54: sub %o0, %o3, %o0 | |
100 | retl | |
101 | sub %o0, 4, %o0 | |
102 | 55: sub %o0, %o3, %o0 | |
103 | retl | |
104 | sub %o0, 3, %o0 | |
105 | 56: sub %o0, %o3, %o0 | |
106 | retl | |
107 | sub %o0, 2, %o0 | |
108 | 57: retl | |
109 | sub %o0, 1, %o0 | |
110 | 30: brlez,pn %o2, 3f | |
111 | sub %g0, %o2, %o3 | |
112 | add %o0, %o2, %o0 | |
113 | 63: lduba [%o1] %asi, %o4 | |
114 | 1: add %o1, 1, %o1 | |
115 | brz,pn %o4, 2f | |
116 | stb %o4, [%o0 + %o3] | |
117 | addcc %o3, 1, %o3 | |
118 | bne,pt %xcc, 1b | |
119 | 64: lduba [%o1] %asi, %o4 | |
120 | 3: retl | |
121 | mov %o2, %o0 | |
122 | 2: retl | |
123 | add %o2, %o3, %o0 | |
8695c37d | 124 | ENDPROC(__strncpy_from_user) |
1da177e4 | 125 | |
4d000d5b | 126 | .section __ex_table,"a" |
1da177e4 | 127 | .align 4 |
5fd29752 DM |
128 | .word 60b, __retl_efault |
129 | .word 61b, __retl_efault | |
130 | .word 62b, __retl_efault | |
131 | .word 63b, __retl_efault | |
132 | .word 64b, __retl_efault | |
133 | .previous |