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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * String handling functions for PowerPC.
4 *
5 * Copyright (C) 1996 Paul Mackerras.
6 */
7#include <linux/export.h>
8#include <asm/ppc_asm.h>
9#include <asm/cache.h>
10
11 .text
12
13/* This clears out any unused part of the destination buffer,
14 just as the libc version does. -- paulus */
15_GLOBAL(strncpy)
16 PPC_LCMPI 0,r5,0
17 beqlr
18 mtctr r5
19 addi r6,r3,-1
20 addi r4,r4,-1
21 .balign IFETCH_ALIGN_BYTES
221: lbzu r0,1(r4)
23 cmpwi 0,r0,0
24 stbu r0,1(r6)
25 bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
26 bnelr /* if we didn't hit a null char, we're done */
27 mfctr r5
28 PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */
29 beqlr /* we know r0 == 0 here */
302: stbu r0,1(r6) /* clear it out if so */
31 bdnz 2b
32 blr
33EXPORT_SYMBOL(strncpy)
34
35_GLOBAL(strncmp)
36 PPC_LCMPI 0,r5,0
37 beq- 2f
38 mtctr r5
39 addi r5,r3,-1
40 addi r4,r4,-1
41 .balign IFETCH_ALIGN_BYTES
421: lbzu r3,1(r5)
43 cmpwi 1,r3,0
44 lbzu r0,1(r4)
45 subf. r3,r0,r3
46 beqlr 1
47 bdnzt eq,1b
48 blr
492: li r3,0
50 blr
51EXPORT_SYMBOL(strncmp)
52
53_GLOBAL(memchr)
54 PPC_LCMPI 0,r5,0
55 beq- 2f
56 mtctr r5
57 addi r3,r3,-1
58 .balign IFETCH_ALIGN_BYTES
591: lbzu r0,1(r3)
60 cmpw 0,r0,r4
61 bdnzf 2,1b
62 beqlr
632: li r3,0
64 blr
65EXPORT_SYMBOL(memchr)
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 <asm/processor.h>
12#include <asm/errno.h>
13#include <asm/ppc_asm.h>
14
15 .section __ex_table,"a"
16 PPC_LONG_ALIGN
17 .text
18
19_GLOBAL(strcpy)
20 addi r5,r3,-1
21 addi r4,r4,-1
221: lbzu r0,1(r4)
23 cmpwi 0,r0,0
24 stbu r0,1(r5)
25 bne 1b
26 blr
27
28/* This clears out any unused part of the destination buffer,
29 just as the libc version does. -- paulus */
30_GLOBAL(strncpy)
31 PPC_LCMPI 0,r5,0
32 beqlr
33 mtctr r5
34 addi r6,r3,-1
35 addi r4,r4,-1
361: lbzu r0,1(r4)
37 cmpwi 0,r0,0
38 stbu r0,1(r6)
39 bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
40 bnelr /* if we didn't hit a null char, we're done */
41 mfctr r5
42 PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */
43 beqlr /* we know r0 == 0 here */
442: stbu r0,1(r6) /* clear it out if so */
45 bdnz 2b
46 blr
47
48_GLOBAL(strcat)
49 addi r5,r3,-1
50 addi r4,r4,-1
511: lbzu r0,1(r5)
52 cmpwi 0,r0,0
53 bne 1b
54 addi r5,r5,-1
551: lbzu r0,1(r4)
56 cmpwi 0,r0,0
57 stbu r0,1(r5)
58 bne 1b
59 blr
60
61_GLOBAL(strcmp)
62 addi r5,r3,-1
63 addi r4,r4,-1
641: lbzu r3,1(r5)
65 cmpwi 1,r3,0
66 lbzu r0,1(r4)
67 subf. r3,r0,r3
68 beqlr 1
69 beq 1b
70 blr
71
72_GLOBAL(strncmp)
73 PPC_LCMPI 0,r5,0
74 beq- 2f
75 mtctr r5
76 addi r5,r3,-1
77 addi r4,r4,-1
781: lbzu r3,1(r5)
79 cmpwi 1,r3,0
80 lbzu r0,1(r4)
81 subf. r3,r0,r3
82 beqlr 1
83 bdnzt eq,1b
84 blr
852: li r3,0
86 blr
87
88_GLOBAL(strlen)
89 addi r4,r3,-1
901: lbzu r0,1(r4)
91 cmpwi 0,r0,0
92 bne 1b
93 subf r3,r3,r4
94 blr
95
96_GLOBAL(memcmp)
97 PPC_LCMPI 0,r5,0
98 beq- 2f
99 mtctr r5
100 addi r6,r3,-1
101 addi r4,r4,-1
1021: lbzu r3,1(r6)
103 lbzu r0,1(r4)
104 subf. r3,r0,r3
105 bdnzt 2,1b
106 blr
1072: li r3,0
108 blr
109
110_GLOBAL(memchr)
111 PPC_LCMPI 0,r5,0
112 beq- 2f
113 mtctr r5
114 addi r3,r3,-1
1151: lbzu r0,1(r3)
116 cmpw 0,r0,r4
117 bdnzf 2,1b
118 beqlr
1192: li r3,0
120 blr
121
122_GLOBAL(__clear_user)
123 addi r6,r3,-4
124 li r3,0
125 li r5,0
126 cmplwi 0,r4,4
127 blt 7f
128 /* clear a single word */
12911: stwu r5,4(r6)
130 beqlr
131 /* clear word sized chunks */
132 andi. r0,r6,3
133 add r4,r0,r4
134 subf r6,r0,r6
135 srwi r0,r4,2
136 andi. r4,r4,3
137 mtctr r0
138 bdz 7f
1391: stwu r5,4(r6)
140 bdnz 1b
141 /* clear byte sized chunks */
1427: cmpwi 0,r4,0
143 beqlr
144 mtctr r4
145 addi r6,r6,3
1468: stbu r5,1(r6)
147 bdnz 8b
148 blr
14990: mr r3,r4
150 blr
15191: mfctr r3
152 slwi r3,r3,2
153 add r3,r3,r4
154 blr
15592: mfctr r3
156 blr
157
158 .section __ex_table,"a"
159 PPC_LONG 11b,90b
160 PPC_LONG 1b,91b
161 PPC_LONG 8b,92b
162 .text
163
164_GLOBAL(__strncpy_from_user)
165 addi r6,r3,-1
166 addi r4,r4,-1
167 cmpwi 0,r5,0
168 beq 2f
169 mtctr r5
1701: lbzu r0,1(r4)
171 cmpwi 0,r0,0
172 stbu r0,1(r6)
173 bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
174 beq 3f
1752: addi r6,r6,1
1763: subf r3,r3,r6
177 blr
17899: li r3,-EFAULT
179 blr
180
181 .section __ex_table,"a"
182 PPC_LONG 1b,99b
183 .text
184
185/* r3 = str, r4 = len (> 0), r5 = top (highest addr) */
186_GLOBAL(__strnlen_user)
187 addi r7,r3,-1
188 subf r6,r7,r5 /* top+1 - str */
189 cmplw 0,r4,r6
190 bge 0f
191 mr r6,r4
1920: mtctr r6 /* ctr = min(len, top - str) */
1931: lbzu r0,1(r7) /* get next byte */
194 cmpwi 0,r0,0
195 bdnzf 2,1b /* loop if --ctr != 0 && byte != 0 */
196 addi r7,r7,1
197 subf r3,r3,r7 /* number of bytes we have looked at */
198 beqlr /* return if we found a 0 byte */
199 cmpw 0,r3,r4 /* did we look at all len bytes? */
200 blt 99f /* if not, must have hit top */
201 addi r3,r4,1 /* return len + 1 to indicate no null found */
202 blr
20399: li r3,0 /* bad address, return 0 */
204 blr
205
206 .section __ex_table,"a"
207 PPC_LONG 1b,99b