| /* | |
| * 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. | |
| * Copyright (C) 2011 MIPS Technologies, 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 0) | |
| * | |
| * Return 0 for error | |
| */ | |
| .macro __BUILD_STRLEN_ASM func | |
| LEAF(__strlen_\func\()_asm) | |
| LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? | |
| and v0, a0 | |
| bnez v0, .Lfault\@ | |
| move v0, a0 | |
| .ifeqs "\func", "kernel" | |
| 1: EX(lbu, v1, (v0), .Lfault\@) | |
| .else | |
| 1: EX(lbue, v1, (v0), .Lfault\@) | |
| .endif | |
| PTR_ADDIU v0, 1 | |
| bnez v1, 1b | |
| PTR_SUBU v0, a0 | |
| jr ra | |
| END(__strlen_\func\()_asm) | |
| .Lfault\@: move v0, zero | |
| jr ra | |
| .endm | |
| #ifndef CONFIG_EVA | |
| /* Set aliases */ | |
| .global __strlen_user_asm | |
| .set __strlen_user_asm, __strlen_kernel_asm | |
| #endif | |
| __BUILD_STRLEN_ASM kernel | |
| #ifdef CONFIG_EVA | |
| .set push | |
| .set eva | |
| __BUILD_STRLEN_ASM user | |
| .set pop | |
| #endif |