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83d290c5 | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
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2 | /* |
3 | * String handling functions for PowerPC. | |
4 | * | |
5 | * Copyright (C) 1996 Paul Mackerras. | |
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6 | */ |
7 | #include <ppc_asm.tmpl> | |
1221ce45 | 8 | #include <linux/errno.h> |
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9 | |
10 | .globl strcpy | |
11 | strcpy: | |
12 | addi r5,r3,-1 | |
13 | addi r4,r4,-1 | |
14 | 1: lbzu r0,1(r4) | |
15 | cmpwi 0,r0,0 | |
16 | stbu r0,1(r5) | |
17 | bne 1b | |
18 | blr | |
19 | ||
20 | .globl strncpy | |
21 | strncpy: | |
22 | cmpwi 0,r5,0 | |
23 | beqlr | |
24 | mtctr r5 | |
25 | addi r6,r3,-1 | |
26 | addi r4,r4,-1 | |
27 | 1: lbzu r0,1(r4) | |
28 | cmpwi 0,r0,0 | |
29 | stbu r0,1(r6) | |
30 | bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ | |
31 | blr | |
32 | ||
33 | .globl strcat | |
34 | strcat: | |
35 | addi r5,r3,-1 | |
36 | addi r4,r4,-1 | |
37 | 1: lbzu r0,1(r5) | |
38 | cmpwi 0,r0,0 | |
39 | bne 1b | |
40 | addi r5,r5,-1 | |
41 | 1: lbzu r0,1(r4) | |
42 | cmpwi 0,r0,0 | |
43 | stbu r0,1(r5) | |
44 | bne 1b | |
45 | blr | |
46 | ||
47 | .globl strcmp | |
48 | strcmp: | |
49 | addi r5,r3,-1 | |
50 | addi r4,r4,-1 | |
51 | 1: lbzu r3,1(r5) | |
52 | cmpwi 1,r3,0 | |
53 | lbzu r0,1(r4) | |
54 | subf. r3,r0,r3 | |
55 | beqlr 1 | |
56 | beq 1b | |
57 | blr | |
58 | ||
59 | .globl strlen | |
60 | strlen: | |
61 | addi r4,r3,-1 | |
62 | 1: lbzu r0,1(r4) | |
63 | cmpwi 0,r0,0 | |
64 | bne 1b | |
65 | subf r3,r3,r4 | |
66 | blr | |
67 | ||
68 | .globl memset | |
69 | memset: | |
70 | rlwimi r4,r4,8,16,23 | |
71 | rlwimi r4,r4,16,0,15 | |
72 | addi r6,r3,-4 | |
73 | cmplwi 0,r5,4 | |
74 | blt 7f | |
75 | stwu r4,4(r6) | |
76 | beqlr | |
77 | andi. r0,r6,3 | |
78 | add r5,r0,r5 | |
79 | subf r6,r0,r6 | |
80 | rlwinm r0,r5,32-2,2,31 | |
81 | mtctr r0 | |
82 | bdz 6f | |
83 | 1: stwu r4,4(r6) | |
84 | bdnz 1b | |
85 | 6: andi. r5,r5,3 | |
86 | 7: cmpwi 0,r5,0 | |
87 | beqlr | |
88 | mtctr r5 | |
89 | addi r6,r6,3 | |
90 | 8: stbu r4,1(r6) | |
91 | bdnz 8b | |
92 | blr | |
93 | ||
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94 | .globl memmove |
95 | memmove: | |
96 | cmplw 0,r3,r4 | |
97 | bgt backwards_memcpy | |
98 | /* fall through */ | |
99 | ||
100 | .globl memcpy | |
101 | memcpy: | |
102 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ | |
103 | addi r6,r3,-4 | |
104 | addi r4,r4,-4 | |
105 | beq 2f /* if less than 8 bytes to do */ | |
106 | andi. r0,r6,3 /* get dest word aligned */ | |
107 | mtctr r7 | |
108 | bne 5f | |
109 | 1: lwz r7,4(r4) | |
110 | lwzu r8,8(r4) | |
111 | stw r7,4(r6) | |
112 | stwu r8,8(r6) | |
113 | bdnz 1b | |
114 | andi. r5,r5,7 | |
115 | 2: cmplwi 0,r5,4 | |
116 | blt 3f | |
117 | lwzu r0,4(r4) | |
118 | addi r5,r5,-4 | |
119 | stwu r0,4(r6) | |
120 | 3: cmpwi 0,r5,0 | |
121 | beqlr | |
122 | mtctr r5 | |
123 | addi r4,r4,3 | |
124 | addi r6,r6,3 | |
125 | 4: lbzu r0,1(r4) | |
126 | stbu r0,1(r6) | |
127 | bdnz 4b | |
128 | blr | |
129 | 5: subfic r0,r0,4 | |
130 | mtctr r0 | |
131 | 6: lbz r7,4(r4) | |
132 | addi r4,r4,1 | |
133 | stb r7,4(r6) | |
134 | addi r6,r6,1 | |
135 | bdnz 6b | |
136 | subf r5,r0,r5 | |
137 | rlwinm. r7,r5,32-3,3,31 | |
138 | beq 2b | |
139 | mtctr r7 | |
140 | b 1b | |
141 | ||
142 | .globl backwards_memcpy | |
143 | backwards_memcpy: | |
144 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ | |
145 | add r6,r3,r5 | |
146 | add r4,r4,r5 | |
147 | beq 2f | |
148 | andi. r0,r6,3 | |
149 | mtctr r7 | |
150 | bne 5f | |
151 | 1: lwz r7,-4(r4) | |
152 | lwzu r8,-8(r4) | |
153 | stw r7,-4(r6) | |
154 | stwu r8,-8(r6) | |
155 | bdnz 1b | |
156 | andi. r5,r5,7 | |
157 | 2: cmplwi 0,r5,4 | |
158 | blt 3f | |
159 | lwzu r0,-4(r4) | |
160 | subi r5,r5,4 | |
161 | stwu r0,-4(r6) | |
162 | 3: cmpwi 0,r5,0 | |
163 | beqlr | |
164 | mtctr r5 | |
165 | 4: lbzu r0,-1(r4) | |
166 | stbu r0,-1(r6) | |
167 | bdnz 4b | |
168 | blr | |
169 | 5: mtctr r0 | |
170 | 6: lbzu r7,-1(r4) | |
171 | stbu r7,-1(r6) | |
172 | bdnz 6b | |
173 | subf r5,r0,r5 | |
174 | rlwinm. r7,r5,32-3,3,31 | |
175 | beq 2b | |
176 | mtctr r7 | |
177 | b 1b | |
178 | ||
179 | .globl memcmp | |
180 | memcmp: | |
181 | cmpwi 0,r5,0 | |
182 | ble- 2f | |
183 | mtctr r5 | |
184 | addi r6,r3,-1 | |
185 | addi r4,r4,-1 | |
186 | 1: lbzu r3,1(r6) | |
187 | lbzu r0,1(r4) | |
188 | subf. r3,r0,r3 | |
189 | bdnzt 2,1b | |
190 | blr | |
191 | 2: li r3,0 | |
192 | blr | |
193 | ||
194 | .global memchr | |
195 | memchr: | |
196 | cmpwi 0,r5,0 | |
197 | ble- 2f | |
198 | mtctr r5 | |
199 | addi r3,r3,-1 | |
200 | 1: lbzu r0,1(r3) | |
201 | cmpw 0,r0,r4 | |
202 | bdnzf 2,1b | |
203 | beqlr | |
204 | 2: li r3,0 | |
205 | blr |