projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public | |
| 3 | * License. See the file "COPYING" in the main directory of this archive | |
| 4 | * for more details. | |
| 5 | * | |
| 6 | * Copyright (c) 1996, 1998, 1999, 2004 by Ralf Baechle | |
| 7 | * Copyright (c) 1999 Silicon Graphics, Inc. | |
| 8 | */ | |
| 9 | #include <asm/asm.h> | |
| 048eb582 | 10 | #include <asm/asm-offsets.h> |
| d6cb6715 | 11 | #include <asm/export.h> |
| 1da177e4 LT |
12 | #include <asm/regdef.h> |
| 13 | ||
| 14 | #define EX(insn,reg,addr,handler) \ | |
| 15 | 9: insn reg, addr; \ | |
| 16 | .section __ex_table,"a"; \ | |
| fa62f39d | 17 | PTR_WD 9b, handler; \ |
| 1da177e4 LT |
18 | .previous |
| 19 | ||
| 20 | /* | |
| 25985edc | 21 | * Return the size of a string including the ending NUL character up to a |
| 1da177e4 LT |
22 | * maximum of a1 or 0 in case of error. |
| 23 | * | |
| 24 | * Note: for performance reasons we deliberately accept that a user may | |
| 70342287 RB |
25 | * make strlen_user and strnlen_user access the first few KSEG0 |
| 26 | * bytes. There's nothing secret there. On 64-bit accessing beyond | |
| 27 | * the maximum is a tad hairier ... | |
| 1da177e4 | 28 | */ |
| 04324f44 | 29 | LEAF(__strnlen_user_asm) |
| 1da177e4 LT |
30 | move v0, a0 |
| 31 | PTR_ADDU a1, a0 # stop pointer | |
| c4fca4fd MR |
32 | 1: |
| 33 | #ifdef CONFIG_CPU_DADDI_WORKAROUNDS | |
| 34 | .set noat | |
| 35 | li AT, 1 | |
| 36 | #endif | |
| 37 | beq v0, a1, 1f # limit reached? | |
| 04324f44 TB |
38 | #ifdef CONFIG_EVA |
| 39 | .set push | |
| 40 | .set eva | |
| 41 | EX(lbe, t0, (v0), .Lfault) | |
| 42 | .set pop | |
| 43 | #else | |
| 44 | EX(lb, t0, (v0), .Lfault) | |
| 45 | #endif | |
| 00977610 | 46 | .set noreorder |
| 1da177e4 | 47 | bnez t0, 1b |
| c4fca4fd MR |
48 | 1: |
| 49 | #ifndef CONFIG_CPU_DADDI_WORKAROUNDS | |
| 50 | PTR_ADDIU v0, 1 | |
| 51 | #else | |
| 52 | PTR_ADDU v0, AT | |
| 53 | .set at | |
| 54 | #endif | |
| 00977610 RB |
55 | .set reorder |
| 56 | PTR_SUBU v0, a0 | |
| 1da177e4 | 57 | jr ra |
| 04324f44 | 58 | END(__strnlen_user_asm) |
| 1da177e4 | 59 | |
| 04324f44 | 60 | .Lfault: |
| c5ec1983 | 61 | move v0, zero |
| 1da177e4 | 62 | jr ra |
| 4968db4b | 63 | |
| 04324f44 | 64 | EXPORT_SYMBOL(__strnlen_user_asm) |