/*
   * 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

  .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
  	.global __strlen_user_nocheck_asm
  	.set __strlen_user_asm, __strlen_kernel_asm
  	.set __strlen_user_nocheck_asm, __strlen_kernel_nocheck_asm
  #endif
  
  __BUILD_STRLEN_ASM kernel
  
  #ifdef CONFIG_EVA
  
  	.set push
  	.set eva

  __BUILD_STRLEN_ASM user

  	.set pop
  #endif