strncmp.S
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/*
* Copyright 2005-2010 Analog Devices Inc.
*
* Licensed under the Clear BSD license or the GPL-2 (or later)
*/
#include <linux/linkage.h>
/* void *strncpy(char *s1, const char *s2, size_t n);
* R0 = address (dest)
* R1 = address (src)
* R2 = size (n)
* Returns a pointer to the destination string dest
*/
#ifdef CONFIG_STRNCMP_L1
.section .l1.text
#else
.text
#endif
.align 2
ENTRY(_strncmp)
CC = R2 == 0;
if CC JUMP 5f;
P0 = R0 ; /* s1 */
P1 = R1 ; /* s2 */
1:
R0 = B[P0++] (Z); /* get *s1 */
R1 = B[P1++] (Z); /* get *s2 */
CC = R0 == R1; /* compare a byte */
if ! cc jump 3f; /* not equal, break out */
CC = R0; /* at end of s1? */
if ! cc jump 4f; /* yes, all done */
R2 += -1; /* no, adjust count */
CC = R2 == 0;
if ! cc jump 1b (bp); /* more to do, keep going */
2:
R0 = 0; /* strings are equal */
jump.s 4f;
3:
R0 = R0 - R1; /* *s1 - *s2 */
4:
RTS;
5:
R0 = 0;
RTS;
ENDPROC(_strncmp)