Eric Lee / smarc-ti-linux-kernel

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arch/unicore32/lib/copy_from_user.S 1.95 KB
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77c93b2f2   GuanXuetao   unicore32 additio... 
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  /*
   * linux/arch/unicore32/lib/copy_from_user.S
   *
   * Code specific to PKUnity SoC and UniCore ISA
   *
   * Copyright (C) 2001-2010 GUAN Xue-tao
   *
   * 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.
   */
  
  #include <linux/linkage.h>
  #include <asm/assembler.h>
  
  /*
   * Prototype:
   *
   *	size_t __copy_from_user(void *to, const void *from, size_t n)
   *
   * Purpose:
   *
   *	copy a block to kernel memory from user memory
   *
   * Params:
   *
   *	to = kernel memory
   *	from = user memory
   *	n = number of bytes to copy
   *
   * Return value:
   *
   *	Number of bytes NOT copied.
   */
  
  	.macro ldr1w ptr reg abort
  	ldrusr	\reg, \ptr, 4, abort=\abort
  	.endm
  
  	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
  100:	ldm.w	(\reg1, \reg2, \reg3, \reg4), [\ptr]+
  	.pushsection __ex_table, "a"
  	.align	3
  	.long 100b, \abort
  	.popsection
  	.endm
  
  	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
  100:	ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
  	.pushsection __ex_table, "a"
  	.align	3
  	.long 100b, \abort
  	.popsection
  	.endm
  
  	.macro ldr1b ptr reg cond=al abort
  	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
  	.endm
  
  	.macro str1w ptr reg abort
  	stw.w \reg, [\ptr]+, #4
  	.endm
  
  	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
  	stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
  	.endm
  
  	.macro str1b ptr reg cond=al abort
  	.ifnc	\cond, al
  	b\cond	201f
  	b	202f
  	.endif
  201:	stb.w \reg, [\ptr]+, #1
  202:
  	.endm
  
  	.macro enter
  	mov	r3, #0
  	stm.w	(r0, r2, r3), [sp-]
  	.endm
  
  	.macro exit
  	add	sp, sp, #8
  	ldm.w	(r0), [sp]+
  	mov	pc, lr
  	.endm
  
  	.text
  
  ENTRY(__copy_from_user)
  
  #include "copy_template.S"
  
  ENDPROC(__copy_from_user)
  
  	.pushsection .fixup,"ax"
  	.align 0
  	copy_abort_preamble
  	ldm.w	(r1, r2), [sp]+
  	sub	r3, r0, r1
  	rsub	r2, r3, r2
  	stw	r2, [sp]
  	mov	r1, #0
  	b.l	memset
  	ldw.w	r0, [sp]+, #4
  	copy_abort_end
  	.popsection