From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/mips/lib/strlen_user.S | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 arch/mips/lib/strlen_user.S (limited to 'arch/mips/lib/strlen_user.S') diff --git a/arch/mips/lib/strlen_user.S b/arch/mips/lib/strlen_user.S new file mode 100644 index 00000000..e362dcdc --- /dev/null +++ b/arch/mips/lib/strlen_user.S @@ -0,0 +1,40 @@ +/* + * 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 +#include +#include + +#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, .Lfault + +FEXPORT(__strlen_user_nocheck_asm) + move v0, a0 +1: EX(lbu, v1, (v0), .Lfault) + PTR_ADDIU v0, 1 + bnez v1, 1b + PTR_SUBU v0, a0 + jr ra + END(__strlen_user_asm) + +.Lfault: move v0, zero + jr ra -- cgit v1.3.1