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1da177e4 LT |
1 | /* |
2 | * Copyright (C) Paul Mackerras 1997. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * NOTE: this code runs in 32 bit mode and is packaged as ELF32. | |
10 | */ | |
11 | ||
decd300b | 12 | #include "ppc_asm.h" |
1da177e4 LT |
13 | |
14 | .text | |
15 | .globl strcpy | |
16 | strcpy: | |
17 | addi r5,r3,-1 | |
18 | addi r4,r4,-1 | |
19 | 1: lbzu r0,1(r4) | |
20 | cmpwi 0,r0,0 | |
21 | stbu r0,1(r5) | |
22 | bne 1b | |
23 | blr | |
24 | ||
25 | .globl strncpy | |
26 | strncpy: | |
27 | cmpwi 0,r5,0 | |
28 | beqlr | |
29 | mtctr r5 | |
30 | addi r6,r3,-1 | |
31 | addi r4,r4,-1 | |
32 | 1: lbzu r0,1(r4) | |
33 | cmpwi 0,r0,0 | |
34 | stbu r0,1(r6) | |
35 | bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ | |
36 | blr | |
37 | ||
38 | .globl strcat | |
39 | strcat: | |
40 | addi r5,r3,-1 | |
41 | addi r4,r4,-1 | |
42 | 1: lbzu r0,1(r5) | |
43 | cmpwi 0,r0,0 | |
44 | bne 1b | |
45 | addi r5,r5,-1 | |
46 | 1: lbzu r0,1(r4) | |
47 | cmpwi 0,r0,0 | |
48 | stbu r0,1(r5) | |
49 | bne 1b | |
50 | blr | |
51 | ||
52 | .globl strcmp | |
53 | strcmp: | |
54 | addi r5,r3,-1 | |
55 | addi r4,r4,-1 | |
56 | 1: lbzu r3,1(r5) | |
57 | cmpwi 1,r3,0 | |
58 | lbzu r0,1(r4) | |
59 | subf. r3,r0,r3 | |
60 | beqlr 1 | |
61 | beq 1b | |
62 | blr | |
63 | ||
64 | .globl strlen | |
65 | strlen: | |
66 | addi r4,r3,-1 | |
67 | 1: lbzu r0,1(r4) | |
68 | cmpwi 0,r0,0 | |
69 | bne 1b | |
70 | subf r3,r3,r4 | |
71 | blr | |
72 | ||
73 | .globl memset | |
74 | memset: | |
75 | rlwimi r4,r4,8,16,23 | |
76 | rlwimi r4,r4,16,0,15 | |
77 | addi r6,r3,-4 | |
78 | cmplwi 0,r5,4 | |
79 | blt 7f | |
80 | stwu r4,4(r6) | |
81 | beqlr | |
82 | andi. r0,r6,3 | |
83 | add r5,r0,r5 | |
84 | subf r6,r0,r6 | |
85 | rlwinm r0,r5,32-2,2,31 | |
86 | mtctr r0 | |
87 | bdz 6f | |
88 | 1: stwu r4,4(r6) | |
89 | bdnz 1b | |
90 | 6: andi. r5,r5,3 | |
91 | 7: cmpwi 0,r5,0 | |
92 | beqlr | |
93 | mtctr r5 | |
94 | addi r6,r6,3 | |
95 | 8: stbu r4,1(r6) | |
96 | bdnz 8b | |
97 | blr | |
98 | ||
99 | .globl memmove | |
100 | memmove: | |
101 | cmplw 0,r3,r4 | |
102 | bgt backwards_memcpy | |
103 | /* fall through */ | |
104 | ||
105 | .globl memcpy | |
106 | memcpy: | |
844ae3a0 | 107 | rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ |
1da177e4 LT |
108 | addi r6,r3,-4 |
109 | addi r4,r4,-4 | |
110 | beq 2f /* if less than 8 bytes to do */ | |
111 | andi. r0,r6,3 /* get dest word aligned */ | |
112 | mtctr r7 | |
113 | bne 5f | |
114 | 1: lwz r7,4(r4) | |
115 | lwzu r8,8(r4) | |
116 | stw r7,4(r6) | |
117 | stwu r8,8(r6) | |
118 | bdnz 1b | |
119 | andi. r5,r5,7 | |
120 | 2: cmplwi 0,r5,4 | |
121 | blt 3f | |
122 | lwzu r0,4(r4) | |
123 | addi r5,r5,-4 | |
124 | stwu r0,4(r6) | |
125 | 3: cmpwi 0,r5,0 | |
126 | beqlr | |
127 | mtctr r5 | |
128 | addi r4,r4,3 | |
129 | addi r6,r6,3 | |
130 | 4: lbzu r0,1(r4) | |
131 | stbu r0,1(r6) | |
132 | bdnz 4b | |
133 | blr | |
134 | 5: subfic r0,r0,4 | |
135 | mtctr r0 | |
136 | 6: lbz r7,4(r4) | |
137 | addi r4,r4,1 | |
138 | stb r7,4(r6) | |
139 | addi r6,r6,1 | |
140 | bdnz 6b | |
141 | subf r5,r0,r5 | |
142 | rlwinm. r7,r5,32-3,3,31 | |
143 | beq 2b | |
144 | mtctr r7 | |
145 | b 1b | |
146 | ||
147 | .globl backwards_memcpy | |
148 | backwards_memcpy: | |
844ae3a0 | 149 | rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ |
1da177e4 LT |
150 | add r6,r3,r5 |
151 | add r4,r4,r5 | |
152 | beq 2f | |
153 | andi. r0,r6,3 | |
154 | mtctr r7 | |
155 | bne 5f | |
156 | 1: lwz r7,-4(r4) | |
157 | lwzu r8,-8(r4) | |
158 | stw r7,-4(r6) | |
159 | stwu r8,-8(r6) | |
160 | bdnz 1b | |
161 | andi. r5,r5,7 | |
162 | 2: cmplwi 0,r5,4 | |
163 | blt 3f | |
164 | lwzu r0,-4(r4) | |
165 | subi r5,r5,4 | |
166 | stwu r0,-4(r6) | |
167 | 3: cmpwi 0,r5,0 | |
168 | beqlr | |
169 | mtctr r5 | |
170 | 4: lbzu r0,-1(r4) | |
171 | stbu r0,-1(r6) | |
172 | bdnz 4b | |
173 | blr | |
174 | 5: mtctr r0 | |
175 | 6: lbzu r7,-1(r4) | |
176 | stbu r7,-1(r6) | |
177 | bdnz 6b | |
178 | subf r5,r0,r5 | |
179 | rlwinm. r7,r5,32-3,3,31 | |
180 | beq 2b | |
181 | mtctr r7 | |
182 | b 1b | |
183 | ||
184 | .globl memcmp | |
185 | memcmp: | |
186 | cmpwi 0,r5,0 | |
187 | blelr | |
188 | mtctr r5 | |
189 | addi r6,r3,-1 | |
190 | addi r4,r4,-1 | |
191 | 1: lbzu r3,1(r6) | |
192 | lbzu r0,1(r4) | |
193 | subf. r3,r0,r3 | |
194 | bdnzt 2,1b | |
195 | blr | |
196 | ||
197 | ||
198 | /* | |
199 | * Flush the dcache and invalidate the icache for a range of addresses. | |
200 | * | |
201 | * flush_cache(addr, len) | |
202 | */ | |
203 | .global flush_cache | |
204 | flush_cache: | |
205 | addi 4,4,0x1f /* len = (len + 0x1f) / 0x20 */ | |
206 | rlwinm. 4,4,27,5,31 | |
207 | mtctr 4 | |
208 | beqlr | |
209 | 1: dcbf 0,3 | |
210 | icbi 0,3 | |
211 | addi 3,3,0x20 | |
212 | bdnz 1b | |
213 | sync | |
214 | isync | |
215 | blr | |
216 |