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
19static 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		: "0" (__dest), "1" (__src)
32		: "memory");
33
34	return __xdest;
35}
36
37#define __HAVE_ARCH_STRNCPY
38static 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		: "0" (__dest), "1" (__src), "r" ((uintptr_t)__src+__n)
57		: "memory");
58
59	return __xdest;
60}
61
62#define __HAVE_ARCH_STRCMP
63static 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		: "0" (__cs), "1" (__ct));
80
81	return __res;
82}
83
84#define __HAVE_ARCH_STRNCMP
85static 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		: "0" (__cs), "1" (__ct), "r" ((uintptr_t)__cs+__n));
105
106	return __res;
107}
108
109#define __HAVE_ARCH_MEMSET
110extern void *memset(void *__s, int __c, size_t __count);
111extern void *__memset(void *__s, int __c, size_t __count);
112
113#define __HAVE_ARCH_MEMCPY
114extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
115extern void *__memcpy(void *__to, __const__ void *__from, size_t __n);
116
117#define __HAVE_ARCH_MEMMOVE
118extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
119extern 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