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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 | * | |
1a459660 | 6 | * SPDX-License-Identifier: GPL-2.0+ |
40c85557 WD |
7 | */ |
8 | #include <ppc_asm.tmpl> | |
1221ce45 | 9 | #include <linux/errno.h> |
40c85557 WD |
10 | |
11 | .globl strcpy | |
12 | strcpy: | |
13 | addi r5,r3,-1 | |
14 | addi r4,r4,-1 | |
15 | 1: lbzu r0,1(r4) | |
16 | cmpwi 0,r0,0 | |
17 | stbu r0,1(r5) | |
18 | bne 1b | |
19 | blr | |
20 | ||
21 | .globl strncpy | |
22 | strncpy: | |
23 | cmpwi 0,r5,0 | |
24 | beqlr | |
25 | mtctr r5 | |
26 | addi r6,r3,-1 | |
27 | addi r4,r4,-1 | |
28 | 1: lbzu r0,1(r4) | |
29 | cmpwi 0,r0,0 | |
30 | stbu r0,1(r6) | |
31 | bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ | |
32 | blr | |
33 | ||
34 | .globl strcat | |
35 | strcat: | |
36 | addi r5,r3,-1 | |
37 | addi r4,r4,-1 | |
38 | 1: lbzu r0,1(r5) | |
39 | cmpwi 0,r0,0 | |
40 | bne 1b | |
41 | addi r5,r5,-1 | |
42 | 1: lbzu r0,1(r4) | |
43 | cmpwi 0,r0,0 | |
44 | stbu r0,1(r5) | |
45 | bne 1b | |
46 | blr | |
47 | ||
48 | .globl strcmp | |
49 | strcmp: | |
50 | addi r5,r3,-1 | |
51 | addi r4,r4,-1 | |
52 | 1: lbzu r3,1(r5) | |
53 | cmpwi 1,r3,0 | |
54 | lbzu r0,1(r4) | |
55 | subf. r3,r0,r3 | |
56 | beqlr 1 | |
57 | beq 1b | |
58 | blr | |
59 | ||
60 | .globl strlen | |
61 | strlen: | |
62 | addi r4,r3,-1 | |
63 | 1: lbzu r0,1(r4) | |
64 | cmpwi 0,r0,0 | |
65 | bne 1b | |
66 | subf r3,r3,r4 | |
67 | blr | |
68 | ||
69 | .globl memset | |
70 | memset: | |
71 | rlwimi r4,r4,8,16,23 | |
72 | rlwimi r4,r4,16,0,15 | |
73 | addi r6,r3,-4 | |
74 | cmplwi 0,r5,4 | |
75 | blt 7f | |
76 | stwu r4,4(r6) | |
77 | beqlr | |
78 | andi. r0,r6,3 | |
79 | add r5,r0,r5 | |
80 | subf r6,r0,r6 | |
81 | rlwinm r0,r5,32-2,2,31 | |
82 | mtctr r0 | |
83 | bdz 6f | |
84 | 1: stwu r4,4(r6) | |
85 | bdnz 1b | |
86 | 6: andi. r5,r5,3 | |
87 | 7: cmpwi 0,r5,0 | |
88 | beqlr | |
89 | mtctr r5 | |
90 | addi r6,r6,3 | |
91 | 8: stbu r4,1(r6) | |
92 | bdnz 8b | |
93 | blr | |
94 | ||
40c85557 WD |
95 | .globl memmove |
96 | memmove: | |
97 | cmplw 0,r3,r4 | |
98 | bgt backwards_memcpy | |
99 | /* fall through */ | |
100 | ||
101 | .globl memcpy | |
102 | memcpy: | |
103 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ | |
104 | addi r6,r3,-4 | |
105 | addi r4,r4,-4 | |
106 | beq 2f /* if less than 8 bytes to do */ | |
107 | andi. r0,r6,3 /* get dest word aligned */ | |
108 | mtctr r7 | |
109 | bne 5f | |
110 | 1: lwz r7,4(r4) | |
111 | lwzu r8,8(r4) | |
112 | stw r7,4(r6) | |
113 | stwu r8,8(r6) | |
114 | bdnz 1b | |
115 | andi. r5,r5,7 | |
116 | 2: cmplwi 0,r5,4 | |
117 | blt 3f | |
118 | lwzu r0,4(r4) | |
119 | addi r5,r5,-4 | |
120 | stwu r0,4(r6) | |
121 | 3: cmpwi 0,r5,0 | |
122 | beqlr | |
123 | mtctr r5 | |
124 | addi r4,r4,3 | |
125 | addi r6,r6,3 | |
126 | 4: lbzu r0,1(r4) | |
127 | stbu r0,1(r6) | |
128 | bdnz 4b | |
129 | blr | |
130 | 5: subfic r0,r0,4 | |
131 | mtctr r0 | |
132 | 6: lbz r7,4(r4) | |
133 | addi r4,r4,1 | |
134 | stb r7,4(r6) | |
135 | addi r6,r6,1 | |
136 | bdnz 6b | |
137 | subf r5,r0,r5 | |
138 | rlwinm. r7,r5,32-3,3,31 | |
139 | beq 2b | |
140 | mtctr r7 | |
141 | b 1b | |
142 | ||
143 | .globl backwards_memcpy | |
144 | backwards_memcpy: | |
145 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ | |
146 | add r6,r3,r5 | |
147 | add r4,r4,r5 | |
148 | beq 2f | |
149 | andi. r0,r6,3 | |
150 | mtctr r7 | |
151 | bne 5f | |
152 | 1: lwz r7,-4(r4) | |
153 | lwzu r8,-8(r4) | |
154 | stw r7,-4(r6) | |
155 | stwu r8,-8(r6) | |
156 | bdnz 1b | |
157 | andi. r5,r5,7 | |
158 | 2: cmplwi 0,r5,4 | |
159 | blt 3f | |
160 | lwzu r0,-4(r4) | |
161 | subi r5,r5,4 | |
162 | stwu r0,-4(r6) | |
163 | 3: cmpwi 0,r5,0 | |
164 | beqlr | |
165 | mtctr r5 | |
166 | 4: lbzu r0,-1(r4) | |
167 | stbu r0,-1(r6) | |
168 | bdnz 4b | |
169 | blr | |
170 | 5: mtctr r0 | |
171 | 6: lbzu r7,-1(r4) | |
172 | stbu r7,-1(r6) | |
173 | bdnz 6b | |
174 | subf r5,r0,r5 | |
175 | rlwinm. r7,r5,32-3,3,31 | |
176 | beq 2b | |
177 | mtctr r7 | |
178 | b 1b | |
179 | ||
180 | .globl memcmp | |
181 | memcmp: | |
182 | cmpwi 0,r5,0 | |
183 | ble- 2f | |
184 | mtctr r5 | |
185 | addi r6,r3,-1 | |
186 | addi r4,r4,-1 | |
187 | 1: lbzu r3,1(r6) | |
188 | lbzu r0,1(r4) | |
189 | subf. r3,r0,r3 | |
190 | bdnzt 2,1b | |
191 | blr | |
192 | 2: li r3,0 | |
193 | blr | |
194 | ||
195 | .global memchr | |
196 | memchr: | |
197 | cmpwi 0,r5,0 | |
198 | ble- 2f | |
199 | mtctr r5 | |
200 | addi r3,r3,-1 | |
201 | 1: lbzu r0,1(r3) | |
202 | cmpw 0,r0,r4 | |
203 | bdnzf 2,1b | |
204 | beqlr | |
205 | 2: li r3,0 | |
206 | blr |