| Robin Getz | 479ba60 | 2010-05-03 17:23:20 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2005-2010 Analog Devices Inc. |
| 3 | * |
| 4 | * Licensed under the ADI 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) |