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Diffstat (limited to 'arch/mips/lib/strlen_user.S')
| -rw-r--r-- | arch/mips/lib/strlen_user.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/mips/lib/strlen_user.S b/arch/mips/lib/strlen_user.S new file mode 100644 index 0000000..07660e8 --- /dev/null +++ b/arch/mips/lib/strlen_user.S @@ -0,0 +1,39 @@ +/* + * 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/offset.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 + */ +LEAF(__strlen_user_asm) + LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? + and v0, a0 + bnez v0, fault + +FEXPORT(__strlen_user_nocheck_asm) + move v0, a0 +1: EX(lb, t0, (v0), fault) + PTR_ADDIU v0, 1 + bnez t0, 1b + PTR_SUBU v0, a0 + jr ra + END(__strlen_user_asm) + +fault: move v0, zero + jr ra |
