| /* |
| * 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 |
