136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
#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:"
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"%2 = B [%1++] (Z);"
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"B [%0++] = %2;"
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"CC = %2;"
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"if cc jump 1b (bp);"
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: "+&a" (dest), "+&a" (src), "=&d" (temp)
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:
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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:"
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"%3 = B [%1++] (Z);"
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"B [%0++] = %3;"
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"CC = %3;"
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"if ! cc jump 2f;"
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"%2 += -1;"
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"CC = %2 == 0;"
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"if ! cc jump 1b (bp);"
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"jump 4f;"
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"2:"
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/* if src is shorter than n, we need to null pad bytes now */
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"%3 = 0;"
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"3:"
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"%2 += -1;"
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"CC = %2 == 0;"
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"if cc jump 4f;"
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"B [%0++] = %3;"
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"jump 3b;"
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"4:"
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: "+&a" (dest), "+&a" (src), "+&da" (n), "=&d" (temp)
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:
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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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/* need to use int's here so the char's in the assembly don't get
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* sign extended incorrectly when we don't want them to be
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*/
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int __res1, __res2;
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__asm__ __volatile__ (
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"1:"
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"%2 = B[%0++] (Z);" /* get *cs */
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"%3 = B[%1++] (Z);" /* get *ct */
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"CC = %2 == %3;" /* compare a byte */
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"if ! cc jump 2f;" /* not equal, break out */
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"CC = %2;" /* at end of cs? */
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"if cc jump 1b (bp);" /* no, keep going */
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"jump.s 3f;" /* strings are equal */
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"2:"
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"%2 = %2 - %3;" /* *cs - *ct */
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"3:"
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: "+&a" (cs), "+&a" (ct), "=&d" (__res1), "=&d" (__res2)
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:
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: "memory", "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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/* need to use int's here so the char's in the assembly don't get
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* sign extended incorrectly when we don't want them to be
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*/
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int __res1, __res2;
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if (!count)
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return 0;
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__asm__ __volatile__ (
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"1:"
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"%3 = B[%0++] (Z);" /* get *cs */
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"%4 = B[%1++] (Z);" /* get *ct */
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"CC = %3 == %4;" /* compare a byte */
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"if ! cc jump 3f;" /* not equal, break out */
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"CC = %3;" /* at end of cs? */
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"if ! cc jump 4f;" /* yes, all done */
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"%2 += -1;" /* no, adjust count */
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"CC = %2 == 0;"
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"if ! cc jump 1b;" /* more to do, keep going */
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"2:"
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"%3 = 0;" /* strings are equal */
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"jump.s 4f;"
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"3:"
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"%3 = %3 - %4;" /* *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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:
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: "memory", "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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