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Commit | Line | Data |
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40c85557 WD |
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 | */ | |
11 | #include <ppc_asm.tmpl> | |
12 | #include <asm/errno.h> | |
13 | ||
14 | .globl strcpy | |
15 | strcpy: | |
16 | addi r5,r3,-1 | |
17 | addi r4,r4,-1 | |
18 | 1: lbzu r0,1(r4) | |
19 | cmpwi 0,r0,0 | |
20 | stbu r0,1(r5) | |
21 | bne 1b | |
22 | blr | |
23 | ||
24 | .globl strncpy | |
25 | strncpy: | |
26 | cmpwi 0,r5,0 | |
27 | beqlr | |
28 | mtctr r5 | |
29 | addi r6,r3,-1 | |
30 | addi r4,r4,-1 | |
31 | 1: lbzu r0,1(r4) | |
32 | cmpwi 0,r0,0 | |
33 | stbu r0,1(r6) | |
34 | bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ | |
35 | blr | |
36 | ||
37 | .globl strcat | |
38 | strcat: | |
39 | addi r5,r3,-1 | |
40 | addi r4,r4,-1 | |
41 | 1: lbzu r0,1(r5) | |
42 | cmpwi 0,r0,0 | |
43 | bne 1b | |
44 | addi r5,r5,-1 | |
45 | 1: lbzu r0,1(r4) | |
46 | cmpwi 0,r0,0 | |
47 | stbu r0,1(r5) | |
48 | bne 1b | |
49 | blr | |
50 | ||
51 | .globl strcmp | |
52 | strcmp: | |
53 | addi r5,r3,-1 | |
54 | addi r4,r4,-1 | |
55 | 1: lbzu r3,1(r5) | |
56 | cmpwi 1,r3,0 | |
57 | lbzu r0,1(r4) | |
58 | subf. r3,r0,r3 | |
59 | beqlr 1 | |
60 | beq 1b | |
61 | blr | |
62 | ||
63 | .globl strlen | |
64 | strlen: | |
65 | addi r4,r3,-1 | |
66 | 1: lbzu r0,1(r4) | |
67 | cmpwi 0,r0,0 | |
68 | bne 1b | |
69 | subf r3,r3,r4 | |
70 | blr | |
71 | ||
72 | .globl memset | |
73 | memset: | |
74 | rlwimi r4,r4,8,16,23 | |
75 | rlwimi r4,r4,16,0,15 | |
76 | addi r6,r3,-4 | |
77 | cmplwi 0,r5,4 | |
78 | blt 7f | |
79 | stwu r4,4(r6) | |
80 | beqlr | |
81 | andi. r0,r6,3 | |
82 | add r5,r0,r5 | |
83 | subf r6,r0,r6 | |
84 | rlwinm r0,r5,32-2,2,31 | |
85 | mtctr r0 | |
86 | bdz 6f | |
87 | 1: stwu r4,4(r6) | |
88 | bdnz 1b | |
89 | 6: andi. r5,r5,3 | |
90 | 7: cmpwi 0,r5,0 | |
91 | beqlr | |
92 | mtctr r5 | |
93 | addi r6,r6,3 | |
94 | 8: stbu r4,1(r6) | |
95 | bdnz 8b | |
96 | blr | |
97 | ||
98 | .globl bcopy | |
99 | bcopy: | |
100 | mr r6,r3 | |
101 | mr r3,r4 | |
102 | mr r4,r6 | |
103 | b memcpy | |
104 | ||
105 | .globl memmove | |
106 | memmove: | |
107 | cmplw 0,r3,r4 | |
108 | bgt backwards_memcpy | |
109 | /* fall through */ | |
110 | ||
111 | .globl memcpy | |
112 | memcpy: | |
113 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ | |
114 | addi r6,r3,-4 | |
115 | addi r4,r4,-4 | |
116 | beq 2f /* if less than 8 bytes to do */ | |
117 | andi. r0,r6,3 /* get dest word aligned */ | |
118 | mtctr r7 | |
119 | bne 5f | |
120 | 1: lwz r7,4(r4) | |
121 | lwzu r8,8(r4) | |
122 | stw r7,4(r6) | |
123 | stwu r8,8(r6) | |
124 | bdnz 1b | |
125 | andi. r5,r5,7 | |
126 | 2: cmplwi 0,r5,4 | |
127 | blt 3f | |
128 | lwzu r0,4(r4) | |
129 | addi r5,r5,-4 | |
130 | stwu r0,4(r6) | |
131 | 3: cmpwi 0,r5,0 | |
132 | beqlr | |
133 | mtctr r5 | |
134 | addi r4,r4,3 | |
135 | addi r6,r6,3 | |
136 | 4: lbzu r0,1(r4) | |
137 | stbu r0,1(r6) | |
138 | bdnz 4b | |
139 | blr | |
140 | 5: subfic r0,r0,4 | |
141 | mtctr r0 | |
142 | 6: lbz r7,4(r4) | |
143 | addi r4,r4,1 | |
144 | stb r7,4(r6) | |
145 | addi r6,r6,1 | |
146 | bdnz 6b | |
147 | subf r5,r0,r5 | |
148 | rlwinm. r7,r5,32-3,3,31 | |
149 | beq 2b | |
150 | mtctr r7 | |
151 | b 1b | |
152 | ||
153 | .globl backwards_memcpy | |
154 | backwards_memcpy: | |
155 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ | |
156 | add r6,r3,r5 | |
157 | add r4,r4,r5 | |
158 | beq 2f | |
159 | andi. r0,r6,3 | |
160 | mtctr r7 | |
161 | bne 5f | |
162 | 1: lwz r7,-4(r4) | |
163 | lwzu r8,-8(r4) | |
164 | stw r7,-4(r6) | |
165 | stwu r8,-8(r6) | |
166 | bdnz 1b | |
167 | andi. r5,r5,7 | |
168 | 2: cmplwi 0,r5,4 | |
169 | blt 3f | |
170 | lwzu r0,-4(r4) | |
171 | subi r5,r5,4 | |
172 | stwu r0,-4(r6) | |
173 | 3: cmpwi 0,r5,0 | |
174 | beqlr | |
175 | mtctr r5 | |
176 | 4: lbzu r0,-1(r4) | |
177 | stbu r0,-1(r6) | |
178 | bdnz 4b | |
179 | blr | |
180 | 5: mtctr r0 | |
181 | 6: lbzu r7,-1(r4) | |
182 | stbu r7,-1(r6) | |
183 | bdnz 6b | |
184 | subf r5,r0,r5 | |
185 | rlwinm. r7,r5,32-3,3,31 | |
186 | beq 2b | |
187 | mtctr r7 | |
188 | b 1b | |
189 | ||
190 | .globl memcmp | |
191 | memcmp: | |
192 | cmpwi 0,r5,0 | |
193 | ble- 2f | |
194 | mtctr r5 | |
195 | addi r6,r3,-1 | |
196 | addi r4,r4,-1 | |
197 | 1: lbzu r3,1(r6) | |
198 | lbzu r0,1(r4) | |
199 | subf. r3,r0,r3 | |
200 | bdnzt 2,1b | |
201 | blr | |
202 | 2: li r3,0 | |
203 | blr | |
204 | ||
205 | .global memchr | |
206 | memchr: | |
207 | cmpwi 0,r5,0 | |
208 | ble- 2f | |
209 | mtctr r5 | |
210 | addi r3,r3,-1 | |
211 | 1: lbzu r0,1(r3) | |
212 | cmpw 0,r0,r4 | |
213 | bdnzf 2,1b | |
214 | beqlr | |
215 | 2: li r3,0 | |
216 | blr |