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linux-next/arch/mips/lib/strlen_user.S
Markos Chandras 5cc494972a MIPS: lib: strlen_user: Use macro to build the strlen_user symbol
Build the __strlen_user symbol using a macro. In EVA mode we will
need to use similar code to do the userspace load operations so
it is better if we use a macro to avoid code duplications.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-03-26 23:09:13 +01:00

45 lines
997 B
ArmAsm

/*
* 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\@
FEXPORT(__strlen_\func\()_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_\func\()_asm)
.Lfault\@: move v0, zero
jr ra
.endm
__BUILD_STRLEN_ASM user