LXR linux/arch/mips/include/asm/string.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (c) 1994, 95, 96, 97, 98, 2000, 01 Ralf Baechle
   7 * Copyright (c) 2000 by Silicon Graphics, Inc.
   8 * Copyright (c) 2001 MIPS Technologies, Inc.
   9 */
  10#ifndef _ASM_STRING_H
  11#define _ASM_STRING_H
  12
  13
  14/*
  15 * Most of the inline functions are rather naive implementations so I just
  16 * didn't bother updating them for 64-bit ...
  17 */
  18#ifdef CONFIG_32BIT
  19
  20#ifndef IN_STRING_C
  21
  22#define __HAVE_ARCH_STRCPY
  23static __inline__ char *strcpy(char *__dest, __const__ char *__src)
  24{
  25  char *__xdest = __dest;
  26
  27  __asm__ __volatile__(
  28        ".set\tnoreorder\n\t"
  29        ".set\tnoat\n"
  30        "1:\tlbu\t$1,(%1)\n\t"
  31        "addiu\t%1,1\n\t"
  32        "sb\t$1,(%0)\n\t"
  33        "bnez\t$1,1b\n\t"
  34        "addiu\t%0,1\n\t"
  35        ".set\tat\n\t"
  36        ".set\treorder"
  37        : "=r" (__dest), "=r" (__src)
  38        : "0" (__dest), "1" (__src)
  39        : "memory");
  40
  41  return __xdest;
  42}
  43
  44#define __HAVE_ARCH_STRNCPY
  45static __inline__ char *strncpy(char *__dest, __const__ char *__src, size_t __n)
  46{
  47  char *__xdest = __dest;
  48
  49  if (__n == 0)
  50    return __xdest;
  51
  52  __asm__ __volatile__(
  53        ".set\tnoreorder\n\t"
  54        ".set\tnoat\n"
  55        "1:\tlbu\t$1,(%1)\n\t"
  56        "subu\t%2,1\n\t"
  57        "sb\t$1,(%0)\n\t"
  58        "beqz\t$1,2f\n\t"
  59        "addiu\t%0,1\n\t"
  60        "bnez\t%2,1b\n\t"
  61        "addiu\t%1,1\n"
  62        "2:\n\t"
  63        ".set\tat\n\t"
  64        ".set\treorder"
  65        : "=r" (__dest), "=r" (__src), "=r" (__n)
  66        : "0" (__dest), "1" (__src), "2" (__n)
  67        : "memory");
  68
  69  return __xdest;
  70}
  71
  72#define __HAVE_ARCH_STRCMP
  73static __inline__ int strcmp(__const__ char *__cs, __const__ char *__ct)
  74{
  75  int __res;
  76
  77  __asm__ __volatile__(
  78        ".set\tnoreorder\n\t"
  79        ".set\tnoat\n\t"
  80        "lbu\t%2,(%0)\n"
  81        "1:\tlbu\t$1,(%1)\n\t"
  82        "addiu\t%0,1\n\t"
  83        "bne\t$1,%2,2f\n\t"
  84        "addiu\t%1,1\n\t"
  85        "bnez\t%2,1b\n\t"
  86        "lbu\t%2,(%0)\n\t"
  87#if defined(CONFIG_CPU_R3000)
  88        "nop\n\t"
  89#endif
  90        "move\t%2,$1\n"
  91        "2:\tsubu\t%2,$1\n"
  92        "3:\t.set\tat\n\t"
  93        ".set\treorder"
  94        : "=r" (__cs), "=r" (__ct), "=r" (__res)
  95        : "0" (__cs), "1" (__ct));
  96
  97  return __res;
  98}
  99
 100#endif /* !defined(IN_STRING_C) */
 101
 102#define __HAVE_ARCH_STRNCMP
 103static __inline__ int
 104strncmp(__const__ char *__cs, __const__ char *__ct, size_t __count)
 105{
 106        int __res;
 107
 108        __asm__ __volatile__(
 109        ".set\tnoreorder\n\t"
 110        ".set\tnoat\n"
 111        "1:\tlbu\t%3,(%0)\n\t"
 112        "beqz\t%2,2f\n\t"
 113        "lbu\t$1,(%1)\n\t"
 114        "subu\t%2,1\n\t"
 115        "bne\t$1,%3,3f\n\t"
 116        "addiu\t%0,1\n\t"
 117        "bnez\t%3,1b\n\t"
 118        "addiu\t%1,1\n"
 119        "2:\n\t"
 120#if defined(CONFIG_CPU_R3000)
 121        "nop\n\t"
 122#endif
 123        "move\t%3,$1\n"
 124        "3:\tsubu\t%3,$1\n\t"
 125        ".set\tat\n\t"
 126        ".set\treorder"
 127        : "=r" (__cs), "=r" (__ct), "=r" (__count), "=r" (__res)
 128        : "0" (__cs), "1" (__ct), "2" (__count));
 129
 130        return __res;
 131}
 132#endif /* CONFIG_32BIT */
 133
 134#define __HAVE_ARCH_MEMSET
 135extern void *memset(void *__s, int __c, size_t __count);
 136
 137#define __HAVE_ARCH_MEMCPY
 138extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
 139
 140#define __HAVE_ARCH_MEMMOVE
 141extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
 142
 143#endif /* _ASM_STRING_H */
 144