53 lines
1023 B
ArmAsm
53 lines
1023 B
ArmAsm
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/*
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* Copyright 2005-2010 Analog Devices Inc.
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*
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* Licensed under the Clear BSD license or the GPL-2 (or later)
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*/
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#include <linux/linkage.h>
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/* void *strncpy(char *s1, const char *s2, size_t n);
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* R0 = address (dest)
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* R1 = address (src)
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* R2 = size (n)
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* Returns a pointer to the destination string dest
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*/
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#ifdef CONFIG_STRNCMP_L1
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.section .l1.text
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#else
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.text
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#endif
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.align 2
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ENTRY(_strncmp)
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CC = R2 == 0;
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if CC JUMP 5f;
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P0 = R0 ; /* s1 */
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P1 = R1 ; /* s2 */
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1:
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R0 = B[P0++] (Z); /* get *s1 */
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R1 = B[P1++] (Z); /* get *s2 */
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CC = R0 == R1; /* compare a byte */
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if ! cc jump 3f; /* not equal, break out */
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CC = R0; /* at end of s1? */
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if ! cc jump 4f; /* yes, all done */
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R2 += -1; /* no, adjust count */
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CC = R2 == 0;
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if ! cc jump 1b (bp); /* more to do, keep going */
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2:
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R0 = 0; /* strings are equal */
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jump.s 4f;
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3:
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R0 = R0 - R1; /* *s1 - *s2 */
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4:
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RTS;
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5:
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R0 = 0;
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RTS;
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ENDPROC(_strncmp)
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