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kernel/linux-imx6_3.14.28/arch/arm/lib/putuser.S 2.26 KB
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  /*
   *  linux/arch/arm/lib/putuser.S
   *
   *  Copyright (C) 2001 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.
   *
   *  Idea from x86 version, (C) Copyright 1998 Linus Torvalds
   *
   * These functions have a non-standard call interface to make
   * them more efficient, especially as they return an error
   * value in addition to the "real" return value.
   *
   * __put_user_X
   *
   * Inputs:	r0 contains the address
   *		r1 contains the address limit, which must be preserved
   *		r2, r3 contains the value
   * Outputs:	r0 is the error code
   *		lr corrupted
   *
   * No other registers must be altered.  (see <asm/uaccess.h>
   * for specific ASM register usage).
   *
   * Note that ADDR_LIMIT is either 0 or 0xc0000000
   * Note also that it is intended that __put_user_bad is not global.
   */
  #include <linux/linkage.h>
  #include <asm/assembler.h>
  #include <asm/errno.h>
  #include <asm/domain.h>
  
  ENTRY(__put_user_1)
  	check_uaccess r0, 1, r1, ip, __put_user_bad
  1: TUSER(strb)	r2, [r0]
  	mov	r0, #0
  	mov	pc, lr
  ENDPROC(__put_user_1)
  
  ENTRY(__put_user_2)
  	check_uaccess r0, 2, r1, ip, __put_user_bad
  	mov	ip, r2, lsr #8
  #ifdef CONFIG_THUMB2_KERNEL
  #ifndef __ARMEB__
  2: TUSER(strb)	r2, [r0]
  3: TUSER(strb)	ip, [r0, #1]
  #else
  2: TUSER(strb)	ip, [r0]
  3: TUSER(strb)	r2, [r0, #1]
  #endif
  #else	/* !CONFIG_THUMB2_KERNEL */
  #ifndef __ARMEB__
  2: TUSER(strb)	r2, [r0], #1
  3: TUSER(strb)	ip, [r0]
  #else
  2: TUSER(strb)	ip, [r0], #1
  3: TUSER(strb)	r2, [r0]
  #endif
  #endif	/* CONFIG_THUMB2_KERNEL */
  	mov	r0, #0
  	mov	pc, lr
  ENDPROC(__put_user_2)
  
  ENTRY(__put_user_4)
  	check_uaccess r0, 4, r1, ip, __put_user_bad
  4: TUSER(str)	r2, [r0]
  	mov	r0, #0
  	mov	pc, lr
  ENDPROC(__put_user_4)
  
  ENTRY(__put_user_8)
  	check_uaccess r0, 8, r1, ip, __put_user_bad
  #ifdef CONFIG_THUMB2_KERNEL
  5: TUSER(str)	r2, [r0]
  6: TUSER(str)	r3, [r0, #4]
  #else
  5: TUSER(str)	r2, [r0], #4
  6: TUSER(str)	r3, [r0]
  #endif
  	mov	r0, #0
  	mov	pc, lr
  ENDPROC(__put_user_8)
  
  __put_user_bad:
  	mov	r0, #-EFAULT
  	mov	pc, lr
  ENDPROC(__put_user_bad)
  
  .pushsection __ex_table, "a"
  	.long	1b, __put_user_bad
  	.long	2b, __put_user_bad
  	.long	3b, __put_user_bad
  	.long	4b, __put_user_bad
  	.long	5b, __put_user_bad
  	.long	6b, __put_user_bad
  .popsection