86 lines
1.4 KiB
ArmAsm
86 lines
1.4 KiB
ArmAsm
/*
|
|
* Copyright 2005-2010 Analog Devices Inc.
|
|
*
|
|
* Licensed under the ADI BSD license or the GPL-2 (or later)
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/context.S>
|
|
|
|
/* void *strncpy(char *dest, const char *src, size_t n);
|
|
* R0 = address (dest)
|
|
* R1 = address (src)
|
|
* R2 = size
|
|
* Returns a pointer (R0) to the destination string dest
|
|
* we do this by not changing R0
|
|
*/
|
|
|
|
#ifdef CONFIG_STRNCPY_L1
|
|
.section .l1.text
|
|
#else
|
|
.text
|
|
#endif
|
|
|
|
.align 2
|
|
|
|
ENTRY(_strncpy)
|
|
CC = R2 == 0;
|
|
if CC JUMP 6f;
|
|
|
|
P2 = R2 ; /* size */
|
|
P0 = R0 ; /* dst*/
|
|
P1 = R1 ; /* src*/
|
|
|
|
LSETUP (1f, 2f) LC0 = P2;
|
|
1:
|
|
R1 = B [P1++] (Z);
|
|
B [P0++] = R1;
|
|
CC = R1 == 0;
|
|
2:
|
|
if CC jump 3f;
|
|
|
|
RTS;
|
|
|
|
/* if src is shorter than n, we need to null pad bytes in dest
|
|
* but, we can get here when the last byte is zero, and we don't
|
|
* want to copy an extra byte at the end, so we need to check
|
|
*/
|
|
3:
|
|
R2 = LC0;
|
|
CC = R2
|
|
if ! CC jump 6f;
|
|
|
|
/* if the required null padded portion is small, do it here, rather than
|
|
* handling the overhead of memset (which is OK when things are big).
|
|
*/
|
|
R3 = 0x20;
|
|
CC = R2 < R3;
|
|
IF CC jump 4f;
|
|
|
|
R2 += -1;
|
|
|
|
/* Set things up for memset
|
|
* R0 = address
|
|
* R1 = filler byte (this case it's zero, set above)
|
|
* R2 = count (set above)
|
|
*/
|
|
|
|
I1 = R0;
|
|
R0 = RETS;
|
|
I0 = R0;
|
|
R0 = P0;
|
|
pseudo_long_call _memset, p0;
|
|
R0 = I0;
|
|
RETS = R0;
|
|
R0 = I1;
|
|
RTS;
|
|
|
|
4:
|
|
LSETUP(5f, 5f) LC0;
|
|
5:
|
|
B [P0++] = R1;
|
|
6:
|
|
RTS;
|
|
|
|
ENDPROC(_strncpy)
|