| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| Sam Ravnborg | 048eb58 | 2005-09-09 22:32:31 +0200 | [diff] [blame] | 10 | #include <asm/asm-offsets.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <asm/regdef.h> |
| 12 | |
| 13 | #define EX(insn,reg,addr,handler) \ |
| 14 | 9: insn reg, addr; \ |
| 15 | .section __ex_table,"a"; \ |
| 16 | PTR 9b, handler; \ |
| 17 | .previous |
| 18 | |
| 19 | /* |
| 20 | * Return the size of a string (including the ending 0) |
| 21 | * |
| 22 | * Return 0 for error |
| 23 | */ |
| 24 | LEAF(__strlen_user_asm) |
| 25 | LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? |
| 26 | and v0, a0 |
| Ralf Baechle | c5ec198 | 2008-01-29 10:14:59 +0000 | [diff] [blame] | 27 | bnez v0, .Lfault |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | FEXPORT(__strlen_user_nocheck_asm) |
| 30 | move v0, a0 |
| Ralf Baechle | c5ec198 | 2008-01-29 10:14:59 +0000 | [diff] [blame] | 31 | 1: EX(lb, t0, (v0), .Lfault) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | PTR_ADDIU v0, 1 |
| 33 | bnez t0, 1b |
| 34 | PTR_SUBU v0, a0 |
| 35 | jr ra |
| 36 | END(__strlen_user_asm) |
| 37 | |
| Ralf Baechle | c5ec198 | 2008-01-29 10:14:59 +0000 | [diff] [blame] | 38 | .Lfault: move v0, zero |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | jr ra |