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Diffstat (limited to 'arch/mips/lib/strlen_user.S')
| -rw-r--r-- | arch/mips/lib/strlen_user.S | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/mips/lib/strlen_user.S b/arch/mips/lib/strlen_user.S new file mode 100644 index 000000000..929bbacd6 --- /dev/null +++ b/arch/mips/lib/strlen_user.S @@ -0,0 +1,61 @@ +/* + * 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 |