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kernel/linux-imx6_3.14.28/arch/avr32/lib/io-readsw.S 789 Bytes
6b13f685e   김민수   BSP 최초 추가
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  /*
   * Copyright (C) 2004-2006 Atmel Corporation
   *
   * 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.
   */
  
  .Lnot_word_aligned:
  	/*
  	 * Bad alignment will cause a hardware exception, which is as
  	 * good as anything. No need for us to check for proper alignment.
  	 */
  	ld.uh	r8, r12[0]
  	sub	r10, 1
  	st.h	r11++, r8
  
  	/* fall through */
  
  	.global	__raw_readsw
  	.type	__raw_readsw,@function
  __raw_readsw:
  	cp.w	r10, 0
  	reteq	r12
  	mov	r9, 3
  	tst	r11, r9
  	brne	.Lnot_word_aligned
  
  	sub	r10, 2
  	brlt	2f
  
  1:	ldins.h	r8:t, r12[0]
  	ldins.h	r8:b, r12[0]
  	st.w	r11++, r8
  	sub	r10, 2
  	brge	1b
  
  2:	sub	r10, -2
  	reteq	r12
  
  	ld.uh	r8, r12[0]
  	st.h	r11++, r8
  	retal	r12