^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Optimized string functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * S390 version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright IBM Corp. 2004
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define IN_ARCH_STRING_C 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Helper functions to find the end of a string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static inline char *__strend(const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) register unsigned long r0 asm("0") = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) asm volatile ("0: srst %0,%1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) " jo 0b"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) : "+d" (r0), "+a" (s) : : "cc", "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) return (char *) r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static inline char *__strnend(const char *s, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) register unsigned long r0 asm("0") = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) const char *p = s + n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) asm volatile ("0: srst %0,%1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) " jo 0b"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) : "+d" (p), "+a" (s) : "d" (r0) : "cc", "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return (char *) p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * strlen - Find the length of a string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * @s: The string to be sized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * returns the length of @s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #ifdef __HAVE_ARCH_STRLEN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) size_t strlen(const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return __strend(s) - s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) EXPORT_SYMBOL(strlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * strnlen - Find the length of a length-limited string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * @s: The string to be sized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * @n: The maximum number of bytes to search
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * returns the minimum of the length of @s and @n
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #ifdef __HAVE_ARCH_STRNLEN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) size_t strnlen(const char *s, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return __strnend(s, n) - s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) EXPORT_SYMBOL(strnlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * strcpy - Copy a %NUL terminated string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * @dest: Where to copy the string to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * @src: Where to copy the string from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * returns a pointer to @dest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #ifdef __HAVE_ARCH_STRCPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) char *strcpy(char *dest, const char *src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) register int r0 asm("0") = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) char *ret = dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) asm volatile ("0: mvst %0,%1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) " jo 0b"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) : "+&a" (dest), "+&a" (src) : "d" (r0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) : "cc", "memory" );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) EXPORT_SYMBOL(strcpy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * strlcpy - Copy a %NUL terminated string into a sized buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * @dest: Where to copy the string to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * @src: Where to copy the string from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * @size: size of destination buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * Compatible with *BSD: the result is always a valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * NUL-terminated string that fits in the buffer (unless,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * of course, the buffer size is zero). It does not pad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * out the result like strncpy() does.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #ifdef __HAVE_ARCH_STRLCPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) size_t strlcpy(char *dest, const char *src, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) size_t ret = __strend(src) - src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) size_t len = (ret >= size) ? size-1 : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) dest[len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) memcpy(dest, src, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) EXPORT_SYMBOL(strlcpy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * strncpy - Copy a length-limited, %NUL-terminated string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * @dest: Where to copy the string to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * @src: Where to copy the string from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * @n: The maximum number of bytes to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * The result is not %NUL-terminated if the source exceeds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * @n bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #ifdef __HAVE_ARCH_STRNCPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) char *strncpy(char *dest, const char *src, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) size_t len = __strnend(src, n) - src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) memset(dest + len, 0, n - len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) memcpy(dest, src, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) EXPORT_SYMBOL(strncpy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * strcat - Append one %NUL-terminated string to another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * @dest: The string to be appended to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * @src: The string to append to it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * returns a pointer to @dest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #ifdef __HAVE_ARCH_STRCAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) char *strcat(char *dest, const char *src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) register int r0 asm("0") = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) unsigned long dummy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) char *ret = dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) asm volatile ("0: srst %0,%1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) " jo 0b\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) "1: mvst %0,%2\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) " jo 1b"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) : "=&a" (dummy), "+a" (dest), "+a" (src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) : "d" (r0), "0" (0UL) : "cc", "memory" );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) EXPORT_SYMBOL(strcat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * strlcat - Append a length-limited, %NUL-terminated string to another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * @dest: The string to be appended to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * @src: The string to append to it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * @n: The size of the destination buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) #ifdef __HAVE_ARCH_STRLCAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) size_t strlcat(char *dest, const char *src, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) size_t dsize = __strend(dest) - dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) size_t len = __strend(src) - src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) size_t res = dsize + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (dsize < n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) dest += dsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) n -= dsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (len >= n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) len = n - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) dest[len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) memcpy(dest, src, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) EXPORT_SYMBOL(strlcat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * strncat - Append a length-limited, %NUL-terminated string to another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * @dest: The string to be appended to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * @src: The string to append to it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * @n: The maximum numbers of bytes to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * returns a pointer to @dest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * Note that in contrast to strncpy, strncat ensures the result is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * terminated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #ifdef __HAVE_ARCH_STRNCAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) char *strncat(char *dest, const char *src, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) size_t len = __strnend(src, n) - src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) char *p = __strend(dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) p[len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) memcpy(p, src, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) EXPORT_SYMBOL(strncat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * strcmp - Compare two strings
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * @s1: One string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * @s2: Another string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * returns 0 if @s1 and @s2 are equal,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * < 0 if @s1 is less than @s2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * > 0 if @s1 is greater than @s2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) #ifdef __HAVE_ARCH_STRCMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) int strcmp(const char *s1, const char *s2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) register int r0 asm("0") = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) asm volatile ("0: clst %2,%3\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) " jo 0b\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) " je 1f\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) " ic %0,0(%2)\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) " ic %1,0(%3)\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) " sr %0,%1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) "1:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) : "+d" (ret), "+d" (r0), "+a" (s1), "+a" (s2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) : : "cc", "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) EXPORT_SYMBOL(strcmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * strrchr - Find the last occurrence of a character in a string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * @s: The string to be searched
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * @c: The character to search for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) #ifdef __HAVE_ARCH_STRRCHR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) char *strrchr(const char *s, int c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) ssize_t len = __strend(s) - s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (s[len] == (char)c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return (char *)s + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) } while (--len >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) EXPORT_SYMBOL(strrchr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static inline int clcle(const char *s1, unsigned long l1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) const char *s2, unsigned long l2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) register unsigned long r2 asm("2") = (unsigned long) s1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) register unsigned long r3 asm("3") = (unsigned long) l1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) register unsigned long r4 asm("4") = (unsigned long) s2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) register unsigned long r5 asm("5") = (unsigned long) l2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) asm volatile ("0: clcle %1,%3,0\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) " jo 0b\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) " ipm %0\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) " srl %0,28"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) : "=&d" (cc), "+a" (r2), "+a" (r3),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) "+a" (r4), "+a" (r5) : : "cc", "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) * strstr - Find the first substring in a %NUL terminated string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * @s1: The string to be searched
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * @s2: The string to search for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) #ifdef __HAVE_ARCH_STRSTR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) char *strstr(const char *s1, const char *s2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) int l1, l2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) l2 = __strend(s2) - s2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (!l2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return (char *) s1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) l1 = __strend(s1) - s1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) while (l1-- >= l2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) cc = clcle(s1, l2, s2, l2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (!cc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return (char *) s1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) s1++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) EXPORT_SYMBOL(strstr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * memchr - Find a character in an area of memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * @s: The memory area
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * @c: The byte to search for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * @n: The size of the area.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * returns the address of the first occurrence of @c, or %NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * if @c is not found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) #ifdef __HAVE_ARCH_MEMCHR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) void *memchr(const void *s, int c, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) register int r0 asm("0") = (char) c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) const void *ret = s + n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) asm volatile ("0: srst %0,%1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) " jo 0b\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) " jl 1f\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) " la %0,0\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) "1:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) return (void *) ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) EXPORT_SYMBOL(memchr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * memcmp - Compare two areas of memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * @s1: One area of memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * @s2: Another area of memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * @n: The size of the area.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) #ifdef __HAVE_ARCH_MEMCMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int memcmp(const void *s1, const void *s2, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) ret = clcle(s1, n, s2, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) ret = ret == 1 ? -1 : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) EXPORT_SYMBOL(memcmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * memscan - Find a character in an area of memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * @s: The memory area
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * @c: The byte to search for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * @n: The size of the area.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * returns the address of the first occurrence of @c, or 1 byte past
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * the area if @c is not found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) #ifdef __HAVE_ARCH_MEMSCAN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) void *memscan(void *s, int c, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) register int r0 asm("0") = (char) c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) const void *ret = s + n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) asm volatile ("0: srst %0,%1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) " jo 0b\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return (void *) ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) EXPORT_SYMBOL(memscan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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