1 /*
2 * include/asm-xtensa/string.h
3 *
4 * These trivial string functions are considered part of the public domain.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 *
10 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 */
12
13 /* We should optimize these. See arch/xtensa/lib/strncpy_user.S */
14
15 #ifndef _XTENSA_STRING_H
16 #define _XTENSA_STRING_H
17
18 #define __HAVE_ARCH_STRCPY
19 static inline char *strcpy(char *__dest, const char *__src)
20 {
21 register char *__xdest = __dest;
22 unsigned long __dummy;
23
24 __asm__ __volatile__("1:\n\t"
25 "l8ui %2, %1, 0\n\t"
26 "s8i %2, %0, 0\n\t"
27 "addi %1, %1, 1\n\t"
28 "addi %0, %0, 1\n\t"
29 "bnez %2, 1b\n\t"
30 : "=r" (__dest), "=r" (__src), "=&r" (__dummy)
31 : "" (__dest), "1" (__src)
32 : "memory");
33
34 return __xdest;
35 }
36
37 #define __HAVE_ARCH_STRNCPY
38 static inline char *strncpy(char *__dest, const char *__src, size_t __n)
39 {
40 register char *__xdest = __dest;
41 unsigned long __dummy;
42
43 if (__n == 0)
44 return __xdest;
45
46 __asm__ __volatile__(
47 "1:\n\t"
48 "l8ui %2, %1, 0\n\t"
49 "s8i %2, %0, 0\n\t"
50 "addi %1, %1, 1\n\t"
51 "addi %0, %0, 1\n\t"
52 "beqz %2, 2f\n\t"
53 "bne %1, %5, 1b\n"
54 "2:"
55 : "=r" (__dest), "=r" (__src), "=&r" (__dummy)
56 : "" (__dest), "1" (__src), "r" ((uintptr_t)__src+__n)
57 : "memory");
58
59 return __xdest;
60 }
61
62 #define __HAVE_ARCH_STRCMP
63 static inline int strcmp(const char *__cs, const char *__ct)
64 {
65 register int __res;
66 unsigned long __dummy;
67
68 __asm__ __volatile__(
69 "1:\n\t"
70 "l8ui %3, %1, 0\n\t"
71 "addi %1, %1, 1\n\t"
72 "l8ui %2, %0, 0\n\t"
73 "addi %0, %0, 1\n\t"
74 "beqz %2, 2f\n\t"
75 "beq %2, %3, 1b\n"
76 "2:\n\t"
77 "sub %2, %2, %3"
78 : "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
79 : "" (__cs), "1" (__ct));
80
81 return __res;
82 }
83
84 #define __HAVE_ARCH_STRNCMP
85 static inline int strncmp(const char *__cs, const char *__ct, size_t __n)
86 {
87 register int __res;
88 unsigned long __dummy;
89
90 __asm__ __volatile__(
91 "mov %2, %3\n"
92 "1:\n\t"
93 "beq %0, %6, 2f\n\t"
94 "l8ui %3, %1, 0\n\t"
95 "addi %1, %1, 1\n\t"
96 "l8ui %2, %0, 0\n\t"
97 "addi %0, %0, 1\n\t"
98 "beqz %2, 2f\n\t"
99 "beqz %3, 2f\n\t"
100 "beq %2, %3, 1b\n"
101 "2:\n\t"
102 "sub %2, %2, %3"
103 : "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
104 : "" (__cs), "1" (__ct), "r" ((uintptr_t)__cs+__n));
105
106 return __res;
107 }
108
109 #define __HAVE_ARCH_MEMSET
110 extern void *memset(void *__s, int __c, size_t __count);
111 extern void *__memset(void *__s, int __c, size_t __count);
112
113 #define __HAVE_ARCH_MEMCPY
114 extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
115 extern void *__memcpy(void *__to, __const__ void *__from, size_t __n);
116
117 #define __HAVE_ARCH_MEMMOVE
118 extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
119 extern void *__memmove(void *__dest, __const__ void *__src, size_t __n);
120
121 #if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
122
123 /*
124 * For files that are not instrumented (e.g. mm/slub.c) we
125 * should use not instrumented version of mem* functions.
126 */
127
128 #define memcpy(dst, src, len) __memcpy(dst, src, len)
129 #define memmove(dst, src, len) __memmove(dst, src, len)
130 #define memset(s, c, n) __memset(s, c, n)
131
132 #ifndef __NO_FORTIFY
133 #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
134 #endif
135 #endif
136
137 #endif /* _XTENSA_STRING_H */
138
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