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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#include <asm/export.h>
15
16 .text
17
18/* This clears out any unused part of the destination buffer,
19 just as the libc version does. -- paulus */
20_GLOBAL(strncpy)
21 PPC_LCMPI 0,r5,0
22 beqlr
23 mtctr r5
24 addi r6,r3,-1
25 addi r4,r4,-1
26 .balign 16
271: 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 bnelr /* if we didn't hit a null char, we're done */
32 mfctr r5
33 PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */
34 beqlr /* we know r0 == 0 here */
352: stbu r0,1(r6) /* clear it out if so */
36 bdnz 2b
37 blr
38EXPORT_SYMBOL(strncpy)
39
40_GLOBAL(strncmp)
41 PPC_LCMPI 0,r5,0
42 beq- 2f
43 mtctr r5
44 addi r5,r3,-1
45 addi r4,r4,-1
46 .balign 16
471: lbzu r3,1(r5)
48 cmpwi 1,r3,0
49 lbzu r0,1(r4)
50 subf. r3,r0,r3
51 beqlr 1
52 bdnzt eq,1b
53 blr
542: li r3,0
55 blr
56EXPORT_SYMBOL(strncmp)
57
58#ifdef CONFIG_PPC32
59_GLOBAL(memcmp)
60 PPC_LCMPI 0,r5,0
61 beq- 2f
62 mtctr r5
63 addi r6,r3,-1
64 addi r4,r4,-1
651: lbzu r3,1(r6)
66 lbzu r0,1(r4)
67 subf. r3,r0,r3
68 bdnzt 2,1b
69 blr
702: li r3,0
71 blr
72EXPORT_SYMBOL(memcmp)
73#endif
74
75_GLOBAL(memchr)
76 PPC_LCMPI 0,r5,0
77 beq- 2f
78 mtctr r5
79 addi r3,r3,-1
80 .balign 16
811: lbzu r0,1(r3)
82 cmpw 0,r0,r4
83 bdnzf 2,1b
84 beqlr
852: li r3,0
86 blr
87EXPORT_SYMBOL(memchr)
88
89#ifdef CONFIG_PPC32
90_GLOBAL(__clear_user)
91 addi r6,r3,-4
92 li r3,0
93 li r5,0
94 cmplwi 0,r4,4
95 blt 7f
96 /* clear a single word */
9711: stwu r5,4(r6)
98 beqlr
99 /* clear word sized chunks */
100 andi. r0,r6,3
101 add r4,r0,r4
102 subf r6,r0,r6
103 srwi r0,r4,2
104 andi. r4,r4,3
105 mtctr r0
106 bdz 7f
1071: stwu r5,4(r6)
108 bdnz 1b
109 /* clear byte sized chunks */
1107: cmpwi 0,r4,0
111 beqlr
112 mtctr r4
113 addi r6,r6,3
1148: stbu r5,1(r6)
115 bdnz 8b
116 blr
11790: mr r3,r4
118 blr
11991: mfctr r3
120 slwi r3,r3,2
121 add r3,r3,r4
122 blr
12392: mfctr r3
124 blr
125
126 EX_TABLE(11b, 90b)
127 EX_TABLE(1b, 91b)
128 EX_TABLE(8b, 92b)
129
130EXPORT_SYMBOL(__clear_user)
131#endif