arch/xtensa/include/asm/string.h

   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                 : "0" (__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                 : "0" (__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                 : "0" (__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                 : "0" (__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 /* 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 */