| /* |
| * 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 4f; |
| |
| 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) |
