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/arch/xtensa/include/asm/string.h

http://github.com/mirrors/linux
C Header | 140 lines | 99 code | 24 blank | 17 comment | 3 complexity | 3c1ea291baabedde3c5e925167f12733 MD5 | raw file
  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/* Don't build bcopy at all ...  */
122#define __HAVE_ARCH_BCOPY
123
124#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
125
126/*
127 * For files that are not instrumented (e.g. mm/slub.c) we
128 * should use not instrumented version of mem* functions.
129 */
130
131#define memcpy(dst, src, len) __memcpy(dst, src, len)
132#define memmove(dst, src, len) __memmove(dst, src, len)
133#define memset(s, c, n) __memset(s, c, n)
134
135#ifndef __NO_FORTIFY
136#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
137#endif
138#endif
139
140#endif	/* _XTENSA_STRING_H */