Merge remote-tracking branch 'vfio/next'
[deliverable/linux.git] / arch / blackfin / lib / strncmp.S
1 /*
2 * Copyright 2005-2010 Analog Devices Inc.
3 *
4 * Licensed under the Clear BSD license or the GPL-2 (or later)
5 */
6
7 #include <linux/linkage.h>
8
9 /* void *strncpy(char *s1, const char *s2, size_t n);
10 * R0 = address (dest)
11 * R1 = address (src)
12 * R2 = size (n)
13 * Returns a pointer to the destination string dest
14 */
15
16 #ifdef CONFIG_STRNCMP_L1
17 .section .l1.text
18 #else
19 .text
20 #endif
21
22 .align 2
23
24 ENTRY(_strncmp)
25 CC = R2 == 0;
26 if CC JUMP 5f;
27
28 P0 = R0 ; /* s1 */
29 P1 = R1 ; /* s2 */
30 1:
31 R0 = B[P0++] (Z); /* get *s1 */
32 R1 = B[P1++] (Z); /* get *s2 */
33 CC = R0 == R1; /* compare a byte */
34 if ! cc jump 3f; /* not equal, break out */
35 CC = R0; /* at end of s1? */
36 if ! cc jump 4f; /* yes, all done */
37 R2 += -1; /* no, adjust count */
38 CC = R2 == 0;
39 if ! cc jump 1b (bp); /* more to do, keep going */
40 2:
41 R0 = 0; /* strings are equal */
42 jump.s 4f;
43 3:
44 R0 = R0 - R1; /* *s1 - *s2 */
45 4:
46 RTS;
47
48 5:
49 R0 = 0;
50 RTS;
51
52 ENDPROC(_strncmp)
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