projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/arm/lib/strncpy_from_user.S | |
| 3 | * | |
| 4 | * Copyright (C) 1995-2000 Russell King | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | */ | |
| 10 | #include <linux/linkage.h> | |
| 11 | #include <asm/assembler.h> | |
| 12 | #include <asm/errno.h> | |
| 13 | ||
| 14 | .text | |
| 15 | .align 5 | |
| 16 | ||
| 17 | /* | |
| 18 | * Copy a string from user space to kernel space. | |
| 19 | * r0 = dst, r1 = src, r2 = byte length | |
| 20 | * returns the number of characters copied (strlen of copied string), | |
| 21 | * -EFAULT on exception, or "len" if we fill the whole buffer | |
| 22 | */ | |
| 02fcb974 | 23 | ENTRY(__strncpy_from_user) |
| 1da177e4 LT |
24 | mov ip, r1 |
| 25 | 1: subs r2, r2, #1 | |
| 8b592783 | 26 | ldrusr r3, r1, 1, pl |
| 1da177e4 LT |
27 | bmi 2f |
| 28 | strb r3, [r0], #1 | |
| 29 | teq r3, #0 | |
| 30 | bne 1b | |
| 31 | sub r1, r1, #1 @ take NUL character out of count | |
| 32 | 2: sub r0, r1, ip | |
| 405040a7 | 33 | mov pc, lr |
| 93ed3970 | 34 | ENDPROC(__strncpy_from_user) |
| 1da177e4 | 35 | |
| 4260415f | 36 | .pushsection .fixup,"ax" |
| 1da177e4 LT |
37 | .align 0 |
| 38 | 9001: mov r3, #0 | |
| 39 | strb r3, [r0, #0] @ null terminate | |
| 40 | mov r0, #-EFAULT | |
| 405040a7 | 41 | mov pc, lr |
| 4260415f | 42 | .popsection |
| 1da177e4 | 43 |