/*
   *  linux/arch/arm/lib/csumpartialcopyuser.S
   *
   *  Copyright (C) 1995-1998 Russell King
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * 27/03/03 Ian Molton Clean up CONFIG_CPU
   *
   */
  #include <linux/linkage.h>
  #include <asm/assembler.h>
  #include <asm/errno.h>

  #include <asm/asm-offsets.h>

  
  		.text
  
  		.macro	save_regs

  		stmfd	sp!, {r1, r2, r4 - r8, lr}

  		.endm

  		.macro	load_regs

  		ldmfd	sp!, {r1, r2, r4 - r8, pc}

  		.endm
  
  		.macro	load1b,	reg1

  		ldrusr	\reg1, r0, 1

  		.endm
  
  		.macro	load2b, reg1, reg2

  		ldrusr	\reg1, r0, 1
  		ldrusr	\reg2, r0, 1

  		.endm
  
  		.macro	load1l, reg1

  		ldrusr	\reg1, r0, 4

  		.endm
  
  		.macro	load2l, reg1, reg2

  		ldrusr	\reg1, r0, 4
  		ldrusr	\reg2, r0, 4

  		.endm
  
  		.macro	load4l, reg1, reg2, reg3, reg4

  		ldrusr	\reg1, r0, 4
  		ldrusr	\reg2, r0, 4
  		ldrusr	\reg3, r0, 4
  		ldrusr	\reg4, r0, 4

  		.endm
  
  /*
   * unsigned int
   * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
   *  r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
   *  Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
   */
  
  #define FN_ENTRY	ENTRY(csum_partial_copy_from_user)

  #define FN_EXIT		ENDPROC(csum_partial_copy_from_user)

  
  #include "csumpartialcopygeneric.S"
  
  /*
   * FIXME: minor buglet here
   * We don't return the checksum for the data present in the buffer.  To do
   * so properly, we would have to add in whatever registers were loaded before
   * the fault, which, with the current asm above is not predictable.
   */

  		.pushsection .fixup,"ax"

  		.align	4

  9001:		mov	r4, #-EFAULT

  		ldr	r5, [sp, #8*4]		@ *err_ptr

  		str	r4, [r5]
  		ldmia	sp, {r1, r2}		@ retrieve dst, len
  		add	r2, r2, r1
  		mov	r0, #0			@ zero the buffer

  9002:		teq	r2, r1

  		strneb	r0, [r1], #1

  		bne	9002b

  		load_regs

  		.popsection