105 строки
2.8 KiB
C
105 строки
2.8 KiB
C
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#ifndef _BLACKFIN_STRING_H_
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#define _BLACKFIN_STRING_H_
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#ifdef __KERNEL__ /* only set these up for kernel code */
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#define __HAVE_ARCH_STRCPY
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extern inline char *strcpy(char *dest, const char *src)
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{
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char *xdest = dest;
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char temp = 0;
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__asm__ __volatile__
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("1:\t%2 = B [%1++] (Z);\n\t"
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"B [%0++] = %2;\n\t"
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"CC = %2;\n\t"
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"if cc jump 1b (bp);\n"
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: "+&a" (dest), "+&a" (src), "=&d" (temp)
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::"memory", "CC");
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return xdest;
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}
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#define __HAVE_ARCH_STRNCPY
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extern inline char *strncpy(char *dest, const char *src, size_t n)
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{
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char *xdest = dest;
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char temp = 0;
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if (n == 0)
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return xdest;
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__asm__ __volatile__
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("1:\t%3 = B [%1++] (Z);\n\t"
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"B [%0++] = %3;\n\t"
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"CC = %3;\n\t"
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"if ! cc jump 2f;\n\t"
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"%2 += -1;\n\t"
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"CC = %2 == 0;\n\t"
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"if ! cc jump 1b (bp);\n"
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"2:\n"
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: "+&a" (dest), "+&a" (src), "+&da" (n), "=&d" (temp)
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::"memory", "CC");
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return xdest;
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}
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#define __HAVE_ARCH_STRCMP
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extern inline int strcmp(const char *cs, const char *ct)
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{
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char __res1, __res2;
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__asm__
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("1:\t%2 = B[%0++] (Z);\n\t" /* get *cs */
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"%3 = B[%1++] (Z);\n\t" /* get *ct */
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"CC = %2 == %3;\n\t" /* compare a byte */
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"if ! cc jump 2f;\n\t" /* not equal, break out */
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"CC = %2;\n\t" /* at end of cs? */
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"if cc jump 1b (bp);\n\t" /* no, keep going */
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"jump.s 3f;\n" /* strings are equal */
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"2:\t%2 = %2 - %3;\n" /* *cs - *ct */
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"3:\n"
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: "+&a" (cs), "+&a" (ct), "=&d" (__res1), "=&d" (__res2)
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: : "CC");
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return __res1;
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}
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#define __HAVE_ARCH_STRNCMP
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extern inline int strncmp(const char *cs, const char *ct, size_t count)
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{
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char __res1, __res2;
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if (!count)
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return 0;
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__asm__
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("1:\t%3 = B[%0++] (Z);\n\t" /* get *cs */
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"%4 = B[%1++] (Z);\n\t" /* get *ct */
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"CC = %3 == %4;\n\t" /* compare a byte */
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"if ! cc jump 3f;\n\t" /* not equal, break out */
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"CC = %3;\n\t" /* at end of cs? */
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"if ! cc jump 4f;\n\t" /* yes, all done */
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"%2 += -1;\n\t" /* no, adjust count */
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"CC = %2 == 0;\n\t"
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"if ! cc jump 1b;\n" /* more to do, keep going */
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"2:\t%3 = 0;\n\t" /* strings are equal */
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"jump.s 4f;\n"
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"3:\t%3 = %3 - %4;\n" /* *cs - *ct */
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"4:"
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: "+&a" (cs), "+&a" (ct), "+&da" (count), "=&d" (__res1), "=&d" (__res2)
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: : "CC");
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return __res1;
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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 *d, const void *s, size_t count);
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#define __HAVE_ARCH_MEMCMP
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extern int memcmp(const void *, const void *, __kernel_size_t);
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#define __HAVE_ARCH_MEMCHR
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extern void *memchr(const void *s, int c, 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 count);
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#endif /*__KERNEL__*/
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#endif /* _BLACKFIN_STRING_H_ */
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