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14cf11af PM |
1 | /* |
2 | * String handling functions for PowerPC. | |
3 | * | |
4 | * Copyright (C) 1996 Paul Mackerras. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
14cf11af PM |
11 | #include <asm/processor.h> |
12 | #include <asm/errno.h> | |
13 | #include <asm/ppc_asm.h> | |
14 | ||
14cf11af | 15 | .section __ex_table,"a" |
76bfdcf7 | 16 | PPC_LONG_ALIGN |
14cf11af PM |
17 | .text |
18 | ||
19 | _GLOBAL(strcpy) | |
20 | addi r5,r3,-1 | |
21 | addi r4,r4,-1 | |
22 | 1: lbzu r0,1(r4) | |
23 | cmpwi 0,r0,0 | |
24 | stbu r0,1(r5) | |
25 | bne 1b | |
26 | blr | |
27 | ||
28 | /* This clears out any unused part of the destination buffer, | |
29 | just as the libc version does. -- paulus */ | |
30 | _GLOBAL(strncpy) | |
ca5d0674 | 31 | PPC_LCMPI 0,r5,0 |
14cf11af PM |
32 | beqlr |
33 | mtctr r5 | |
34 | addi r6,r3,-1 | |
35 | addi r4,r4,-1 | |
36 | 1: lbzu r0,1(r4) | |
37 | cmpwi 0,r0,0 | |
38 | stbu r0,1(r6) | |
39 | bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ | |
40 | bnelr /* if we didn't hit a null char, we're done */ | |
41 | mfctr r5 | |
ca5d0674 | 42 | PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */ |
14cf11af PM |
43 | beqlr /* we know r0 == 0 here */ |
44 | 2: stbu r0,1(r6) /* clear it out if so */ | |
45 | bdnz 2b | |
46 | blr | |
47 | ||
48 | _GLOBAL(strcat) | |
49 | addi r5,r3,-1 | |
50 | addi r4,r4,-1 | |
51 | 1: lbzu r0,1(r5) | |
52 | cmpwi 0,r0,0 | |
53 | bne 1b | |
54 | addi r5,r5,-1 | |
55 | 1: lbzu r0,1(r4) | |
56 | cmpwi 0,r0,0 | |
57 | stbu r0,1(r5) | |
58 | bne 1b | |
59 | blr | |
60 | ||
61 | _GLOBAL(strcmp) | |
62 | addi r5,r3,-1 | |
63 | addi r4,r4,-1 | |
64 | 1: lbzu r3,1(r5) | |
65 | cmpwi 1,r3,0 | |
66 | lbzu r0,1(r4) | |
67 | subf. r3,r0,r3 | |
68 | beqlr 1 | |
69 | beq 1b | |
70 | blr | |
71 | ||
0119536c | 72 | _GLOBAL(strncmp) |
ca5d0674 AS |
73 | PPC_LCMPI 0,r5,0 |
74 | beq- 2f | |
0119536c SR |
75 | mtctr r5 |
76 | addi r5,r3,-1 | |
77 | addi r4,r4,-1 | |
78 | 1: lbzu r3,1(r5) | |
79 | cmpwi 1,r3,0 | |
80 | lbzu r0,1(r4) | |
81 | subf. r3,r0,r3 | |
82 | beqlr 1 | |
83 | bdnzt eq,1b | |
84 | blr | |
637a9902 JM |
85 | 2: li r3,0 |
86 | blr | |
0119536c | 87 | |
14cf11af PM |
88 | _GLOBAL(strlen) |
89 | addi r4,r3,-1 | |
90 | 1: lbzu r0,1(r4) | |
91 | cmpwi 0,r0,0 | |
92 | bne 1b | |
93 | subf r3,r3,r4 | |
94 | blr | |
95 | ||
15c2d45d | 96 | #ifdef CONFIG_PPC32 |
14cf11af | 97 | _GLOBAL(memcmp) |
ca5d0674 AS |
98 | PPC_LCMPI 0,r5,0 |
99 | beq- 2f | |
14cf11af PM |
100 | mtctr r5 |
101 | addi r6,r3,-1 | |
102 | addi r4,r4,-1 | |
103 | 1: lbzu r3,1(r6) | |
104 | lbzu r0,1(r4) | |
105 | subf. r3,r0,r3 | |
106 | bdnzt 2,1b | |
107 | blr | |
108 | 2: li r3,0 | |
109 | blr | |
15c2d45d | 110 | #endif |
14cf11af PM |
111 | |
112 | _GLOBAL(memchr) | |
ca5d0674 AS |
113 | PPC_LCMPI 0,r5,0 |
114 | beq- 2f | |
14cf11af PM |
115 | mtctr r5 |
116 | addi r3,r3,-1 | |
117 | 1: lbzu r0,1(r3) | |
118 | cmpw 0,r0,r4 | |
119 | bdnzf 2,1b | |
120 | beqlr | |
121 | 2: li r3,0 | |
122 | blr | |
123 | ||
17968fbb | 124 | #ifdef CONFIG_PPC32 |
14cf11af PM |
125 | _GLOBAL(__clear_user) |
126 | addi r6,r3,-4 | |
127 | li r3,0 | |
128 | li r5,0 | |
129 | cmplwi 0,r4,4 | |
130 | blt 7f | |
131 | /* clear a single word */ | |
132 | 11: stwu r5,4(r6) | |
133 | beqlr | |
134 | /* clear word sized chunks */ | |
135 | andi. r0,r6,3 | |
136 | add r4,r0,r4 | |
137 | subf r6,r0,r6 | |
138 | srwi r0,r4,2 | |
139 | andi. r4,r4,3 | |
140 | mtctr r0 | |
141 | bdz 7f | |
142 | 1: stwu r5,4(r6) | |
143 | bdnz 1b | |
144 | /* clear byte sized chunks */ | |
145 | 7: cmpwi 0,r4,0 | |
146 | beqlr | |
147 | mtctr r4 | |
148 | addi r6,r6,3 | |
149 | 8: stbu r5,1(r6) | |
150 | bdnz 8b | |
151 | blr | |
152 | 90: mr r3,r4 | |
153 | blr | |
154 | 91: mfctr r3 | |
155 | slwi r3,r3,2 | |
156 | add r3,r3,r4 | |
157 | blr | |
158 | 92: mfctr r3 | |
159 | blr | |
160 | ||
161 | .section __ex_table,"a" | |
76bfdcf7 ME |
162 | PPC_LONG 11b,90b |
163 | PPC_LONG 1b,91b | |
164 | PPC_LONG 8b,92b | |
14cf11af | 165 | .text |
17968fbb | 166 | #endif |