1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/*
* Copyright (C) Paul Mackerras 1997.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* NOTE: this code runs in 32 bit mode and is packaged as ELF32.
*/
#include "ppc_asm.h"
.text
.globl strcpy
strcpy:
addi r5,r3,-1
addi r4,r4,-1
1: lbzu r0,1(r4)
cmpwi 0,r0,0
stbu r0,1(r5)
bne 1b
blr
.globl strncpy
strncpy:
cmpwi 0,r5,0
beqlr
mtctr r5
addi r6,r3,-1
addi r4,r4,-1
1: lbzu r0,1(r4)
cmpwi 0,r0,0
stbu r0,1(r6)
bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
blr
.globl strcat
strcat:
addi r5,r3,-1
addi r4,r4,-1
1: lbzu r0,1(r5)
cmpwi 0,r0,0
bne 1b
addi r5,r5,-1
1: lbzu r0,1(r4)
cmpwi 0,r0,0
stbu r0,1(r5)
bne 1b
blr
.globl strchr
strchr:
addi r3,r3,-1
1: lbzu r0,1(r3)
cmpw 0,r0,r4
beqlr
cmpwi 0,r0,0
bne 1b
li r3,0
blr
.globl strcmp
strcmp:
addi r5,r3,-1
addi r4,r4,-1
1: lbzu r3,1(r5)
cmpwi 1,r3,0
lbzu r0,1(r4)
subf. r3,r0,r3
beqlr 1
beq 1b
blr
.globl strncmp
strncmp:
mtctr r5
addi r5,r3,-1
addi r4,r4,-1
1: lbzu r3,1(r5)
cmpwi 1,r3,0
lbzu r0,1(r4)
subf. r3,r0,r3
beqlr 1
bdnzt eq,1b
blr
.globl strlen
strlen:
addi r4,r3,-1
1: lbzu r0,1(r4)
cmpwi 0,r0,0
bne 1b
subf r3,r3,r4
blr
.globl memset
memset:
rlwimi r4,r4,8,16,23
rlwimi r4,r4,16,0,15
addi r6,r3,-4
cmplwi 0,r5,4
blt 7f
stwu r4,4(r6)
beqlr
andi. r0,r6,3
add r5,r0,r5
subf r6,r0,r6
rlwinm r0,r5,32-2,2,31
mtctr r0
bdz 6f
1: stwu r4,4(r6)
bdnz 1b
6: andi. r5,r5,3
7: cmpwi 0,r5,0
beqlr
mtctr r5
addi r6,r6,3
8: stbu r4,1(r6)
bdnz 8b
blr
.globl memmove
memmove:
cmplw 0,r3,r4
bgt backwards_memcpy
/* fall through */
.globl memcpy
memcpy:
rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */
addi r6,r3,-4
addi r4,r4,-4
beq 3f /* if less than 8 bytes to do */
andi. r0,r6,3 /* get dest word aligned */
mtctr r7
bne 5f
andi. r0,r4,3 /* check src word aligned too */
bne 3f
1: lwz r7,4(r4)
lwzu r8,8(r4)
stw r7,4(r6)
stwu r8,8(r6)
bdnz 1b
andi. r5,r5,7
2: cmplwi 0,r5,4
blt 3f
lwzu r0,4(r4)
addi r5,r5,-4
stwu r0,4(r6)
3: cmpwi 0,r5,0
beqlr
mtctr r5
addi r4,r4,3
addi r6,r6,3
4: lbzu r0,1(r4)
stbu r0,1(r6)
bdnz 4b
blr
5: subfic r0,r0,4
cmpw cr1,r0,r5
add r7,r0,r4
andi. r7,r7,3 /* will source be word-aligned too? */
ble cr1,3b
bne 3b /* do byte-by-byte if not */
mtctr r0
6: lbz r7,4(r4)
addi r4,r4,1
stb r7,4(r6)
addi r6,r6,1
bdnz 6b
subf r5,r0,r5
rlwinm. r7,r5,32-3,3,31
beq 2b
mtctr r7
b 1b
.globl backwards_memcpy
backwards_memcpy:
rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */
add r6,r3,r5
add r4,r4,r5
beq 3f
andi. r0,r6,3
mtctr r7
bne 5f
andi. r0,r4,3
bne 3f
1: lwz r7,-4(r4)
lwzu r8,-8(r4)
stw r7,-4(r6)
stwu r8,-8(r6)
bdnz 1b
andi. r5,r5,7
2: cmplwi 0,r5,4
blt 3f
lwzu r0,-4(r4)
subi r5,r5,4
stwu r0,-4(r6)
3: cmpwi 0,r5,0
beqlr
mtctr r5
4: lbzu r0,-1(r4)
stbu r0,-1(r6)
bdnz 4b
blr
5: cmpw cr1,r0,r5
subf r7,r0,r4
andi. r7,r7,3
ble cr1,3b
bne 3b
mtctr r0
6: lbzu r7,-1(r4)
stbu r7,-1(r6)
bdnz 6b
subf r5,r0,r5
rlwinm. r7,r5,32-3,3,31
beq 2b
mtctr r7
b 1b
.globl memcmp
memcmp:
cmpwi 0,r5,0
blelr
mtctr r5
addi r6,r3,-1
addi r4,r4,-1
1: lbzu r3,1(r6)
lbzu r0,1(r4)
subf. r3,r0,r3
bdnzt 2,1b
blr
/*
* Flush the dcache and invalidate the icache for a range of addresses.
*
* flush_cache(addr, len)
*/
.global flush_cache
flush_cache:
addi 4,4,0x1f /* len = (len + 0x1f) / 0x20 */
rlwinm. 4,4,27,5,31
mtctr 4
beqlr
1: dcbf 0,3
icbi 0,3
addi 3,3,0x20
bdnz 1b
sync
isync
blr
|
