mirror of https://gitee.com/openkylin/linux.git
53 lines
794 B
ArmAsm
53 lines
794 B
ArmAsm
/*
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* Copyright 2005-2010 Analog Devices Inc.
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*
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* Licensed under the ADI 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 *dest, const char *src, size_t n);
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* R0 = address (dest)
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* R1 = address (src)
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* R2 = size
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* Returns a pointer to the destination string dest
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*/
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#ifdef CONFIG_STRNCPY_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(_strncpy)
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CC = R2 == 0;
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if CC JUMP 4f;
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P0 = R0 ; /* dst*/
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P1 = R1 ; /* src*/
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1:
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R1 = B [P1++] (Z);
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B [P0++] = R1;
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CC = R1;
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if ! cc jump 2f;
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R2 += -1;
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CC = R2 == 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 in dest */
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R1 = 0;
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3:
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R2 += -1;
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CC = R2 == 0;
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if cc jump 4f;
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B [P0++] = R1;
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jump 3b;
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4:
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RTS;
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ENDPROC(_strncpy)
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