125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
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/*
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* include/asm-xtensa/string.h
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*
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* These trivial string functions are considered part of the public domain.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*/
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/* We should optimize these. See arch/xtensa/lib/strncpy_user.S */
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#ifndef _XTENSA_STRING_H
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#define _XTENSA_STRING_H
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#define __HAVE_ARCH_STRCPY
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static inline char *strcpy(char *__dest, const char *__src)
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{
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register char *__xdest = __dest;
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unsigned long __dummy;
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__asm__ __volatile__("1:\n\t"
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"l8ui %2, %1, 0\n\t"
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"s8i %2, %0, 0\n\t"
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"addi %1, %1, 1\n\t"
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"addi %0, %0, 1\n\t"
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"bnez %2, 1b\n\t"
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: "=r" (__dest), "=r" (__src), "=&r" (__dummy)
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: "0" (__dest), "1" (__src)
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: "memory");
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return __xdest;
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}
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#define __HAVE_ARCH_STRNCPY
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static inline char *strncpy(char *__dest, const char *__src, size_t __n)
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{
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register char *__xdest = __dest;
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unsigned long __dummy;
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if (__n == 0)
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return __xdest;
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__asm__ __volatile__(
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"1:\n\t"
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"l8ui %2, %1, 0\n\t"
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"s8i %2, %0, 0\n\t"
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"addi %1, %1, 1\n\t"
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"addi %0, %0, 1\n\t"
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"beqz %2, 2f\n\t"
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"bne %1, %5, 1b\n"
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"2:"
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: "=r" (__dest), "=r" (__src), "=&r" (__dummy)
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: "0" (__dest), "1" (__src), "r" (__src+__n)
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: "memory");
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return __xdest;
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}
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#define __HAVE_ARCH_STRCMP
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static inline int strcmp(const char *__cs, const char *__ct)
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{
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register int __res;
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unsigned long __dummy;
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__asm__ __volatile__(
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"1:\n\t"
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"l8ui %3, %1, 0\n\t"
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"addi %1, %1, 1\n\t"
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"l8ui %2, %0, 0\n\t"
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"addi %0, %0, 1\n\t"
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"beqz %2, 2f\n\t"
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"beq %2, %3, 1b\n"
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"2:\n\t"
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"sub %2, %3, %2"
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: "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
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: "0" (__cs), "1" (__ct));
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return __res;
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}
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#define __HAVE_ARCH_STRNCMP
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static inline int strncmp(const char *__cs, const char *__ct, size_t __n)
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{
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register int __res;
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unsigned long __dummy;
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__asm__ __volatile__(
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"mov %2, %3\n"
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"1:\n\t"
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"beq %0, %6, 2f\n\t"
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"l8ui %3, %1, 0\n\t"
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"addi %1, %1, 1\n\t"
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"l8ui %2, %0, 0\n\t"
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"addi %0, %0, 1\n\t"
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"beqz %2, 2f\n\t"
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"beqz %3, 2f\n\t"
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"beq %2, %3, 1b\n"
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"2:\n\t"
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"sub %2, %3, %2"
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: "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
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: "0" (__cs), "1" (__ct), "r" (__cs+__n));
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return __res;
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}
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *__s, int __c, size_t __count);
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
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/* Don't build bcopy at all ... */
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#define __HAVE_ARCH_BCOPY
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#define __HAVE_ARCH_MEMSCAN
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#define memscan memchr
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#endif /* _XTENSA_STRING_H */
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