| /* | |
| * This file is subject to the terms and conditions of the GNU General Public | |
| * License. See the file "COPYING" in the main directory of this archive | |
| * for more details. | |
| * | |
| * Copyright (c) 1996, 1998, 1999, 2004 by Ralf Baechle | |
| * Copyright (c) 1999 Silicon Graphics, Inc. | |
| */ | |
| #include <asm/asm.h> | |
| #include <asm/asm-offsets.h> | |
| #include <asm/regdef.h> | |
| #define EX(insn,reg,addr,handler) \ | |
| 9: insn reg, addr; \ | |
| .section __ex_table,"a"; \ | |
| PTR 9b, handler; \ | |
| .previous | |
| /* | |
| * Return the size of a string including the ending NUL character upto a | |
| * maximum of a1 or 0 in case of error. | |
| * | |
| * Note: for performance reasons we deliberately accept that a user may | |
| * make strlen_user and strnlen_user access the first few KSEG0 | |
| * bytes. There's nothing secret there. On 64-bit accessing beyond | |
| * the maximum is a tad hairier ... | |
| */ | |
| LEAF(__strnlen_user_asm) | |
| LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? | |
| and v0, a0 | |
| bnez v0, fault | |
| FEXPORT(__strnlen_user_nocheck_asm) | |
| move v0, a0 | |
| PTR_ADDU a1, a0 # stop pointer | |
| 1: beq v0, a1, 1f # limit reached? | |
| EX(lb, t0, (v0), fault) | |
| PTR_ADDU v0, 1 | |
| bnez t0, 1b | |
| 1: PTR_SUBU v0, a0 | |
| jr ra | |
| END(__strnlen_user_asm) | |
| fault: move v0, zero | |
| jr ra |