LXR linux-old/include/asm-mips/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, 1995, 1996, 1997, 1998, 2001 Ralf Baechle
   7 * Copyright (c) 2001 MIPS Technologies, Inc.
   8 */
   9#ifndef __ASM_STRING_H
  10#define __ASM_STRING_H
  11
  12#include <linux/config.h>
  13
  14#define __HAVE_ARCH_STRCPY
  15static __inline__ char *strcpy(char *__dest, __const__ char *__src)
  16{
  17  char *__xdest = __dest;
  18
  19  __asm__ __volatile__(
  20        ".set\tnoreorder\n\t"
  21        ".set\tnoat\n"
  22        "1:\tlbu\t$1,(%1)\n\t"
  23        "addiu\t%1,1\n\t"
  24        "sb\t$1,(%0)\n\t"
  25        "bnez\t$1,1b\n\t"
  26        "addiu\t%0,1\n\t"
  27        ".set\tat\n\t"
  28        ".set\treorder"
  29        : "=r" (__dest), "=r" (__src)
  30        : "0" (__dest), "1" (__src)
  31        : "memory");
  32
  33  return __xdest;
  34}
  35
  36#define __HAVE_ARCH_STRNCPY
  37static __inline__ char *strncpy(char *__dest, __const__ char *__src, size_t __n)
  38{
  39  char *__xdest = __dest;
  40
  41  if (__n == 0)
  42    return __xdest;
  43
  44  __asm__ __volatile__(
  45        ".set\tnoreorder\n\t"
  46        ".set\tnoat\n"
  47        "1:\tlbu\t$1,(%1)\n\t"
  48        "subu\t%2,1\n\t"
  49        "sb\t$1,(%0)\n\t"
  50        "beqz\t$1,2f\n\t"
  51        "addiu\t%0,1\n\t"
  52        "bnez\t%2,1b\n\t"
  53        "addiu\t%1,1\n"
  54        "2:\n\t"
  55        ".set\tat\n\t"
  56        ".set\treorder"
  57        : "=r" (__dest), "=r" (__src), "=r" (__n)
  58        : "0" (__dest), "1" (__src), "2" (__n)
  59        : "memory");
  60
  61  return __xdest;
  62}
  63
  64#define __HAVE_ARCH_STRCMP
  65static __inline__ int strcmp(__const__ char *__cs, __const__ char *__ct)
  66{
  67  int __res;
  68
  69  __asm__ __volatile__(
  70        ".set\tnoreorder\n\t"
  71        ".set\tnoat\n\t"
  72        "lbu\t%2,(%0)\n"
  73        "1:\tlbu\t$1,(%1)\n\t"
  74        "addiu\t%0,1\n\t"
  75        "bne\t$1,%2,2f\n\t"
  76        "addiu\t%1,1\n\t"
  77        "bnez\t%2,1b\n\t"
  78        "lbu\t%2,(%0)\n\t"
  79#if defined(CONFIG_CPU_R3000)
  80        "nop\n\t"
  81#endif
  82        "move\t%2,$1\n"
  83        "2:\tsubu\t%2,$1\n"
  84        "3:\t.set\tat\n\t"
  85        ".set\treorder"
  86        : "=r" (__cs), "=r" (__ct), "=r" (__res)
  87        : "0" (__cs), "1" (__ct));
  88
  89  return __res;
  90}
  91
  92#define __HAVE_ARCH_STRNCMP
  93static __inline__ int
  94strncmp(__const__ char *__cs, __const__ char *__ct, size_t __count)
  95{
  96        int __res;
  97
  98        __asm__ __volatile__(
  99        ".set\tnoreorder\n\t"
 100        ".set\tnoat\n"
 101        "1:\tlbu\t%3,(%0)\n\t"
 102        "beqz\t%2,2f\n\t"
 103        "lbu\t$1,(%1)\n\t"
 104        "subu\t%2,1\n\t"
 105        "bne\t$1,%3,3f\n\t"
 106        "addiu\t%0,1\n\t"
 107        "bnez\t%3,1b\n\t"
 108        "addiu\t%1,1\n"
 109        "2:\n\t"
 110#if defined(CONFIG_CPU_R3000)
 111        "nop\n\t"
 112#endif
 113        "move\t%3,$1\n"
 114        "3:\tsubu\t%3,$1\n\t"
 115        ".set\tat\n\t"
 116        ".set\treorder"
 117        : "=r" (__cs), "=r" (__ct), "=r" (__count), "=r" (__res)
 118        : "0" (__cs), "1" (__ct), "2" (__count));
 119
 120        return __res;
 121}
 122
 123#define __HAVE_ARCH_MEMSET
 124extern void *memset(void *__s, int __c, size_t __count);
 125
 126#define __HAVE_ARCH_MEMCPY
 127extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
 128
 129#define __HAVE_ARCH_MEMMOVE
 130extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
 131
 132/* Don't build bcopy at all ...  */
 133#define __HAVE_ARCH_BCOPY
 134
 135#define __HAVE_ARCH_MEMSCAN
 136static __inline__ void *memscan(void *__addr, int __c, size_t __size)
 137{
 138        char *__end = (char *)__addr + __size;
 139        unsigned char __uc = (unsigned char) __c;
 140
 141        __asm__(".set\tpush\n\t"
 142                ".set\tnoat\n\t"
 143                ".set\treorder\n\t"
 144                "1:\tbeq\t%0,%1,2f\n\t"
 145                "addiu\t%0,1\n\t"
 146                "lbu\t$1,-1(%0)\n\t"
 147                "bne\t$1,%z4,1b\n"
 148                "2:\t.set\tpop"
 149                : "=r" (__addr), "=r" (__end)
 150                : "0" (__addr), "1" (__end), "Jr" (__uc));
 151
 152        return __addr;
 153}
 154
 155#endif /* __ASM_STRING_H */
 156