arch/unicore32/lib/copy_to_user.S

   1 /*
   2  * linux/arch/unicore32/lib/copy_to_user.S
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/linkage.h>
  14 #include <asm/assembler.h>
  15
  16 /*
  17  * Prototype:
  18  *
  19  *      size_t raw_copy_to_user(void *to, const void *from, size_t n)
  20  *
  21  * Purpose:
  22  *
  23  *      copy a block to user memory from kernel memory
  24  *
  25  * Params:
  26  *
  27  *      to = user memory
  28  *      from = kernel memory
  29  *      n = number of bytes to copy
  30  *
  31  * Return value:
  32  *
  33  *      Number of bytes NOT copied.
  34  */
  35
  36         .macro ldr1w ptr reg abort
  37         ldw.w \reg, [\ptr]+, #4
  38         .endm
  39
  40         .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
  41         ldm.w   (\reg1, \reg2, \reg3, \reg4), [\ptr]+
  42         .endm
  43
  44         .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
  45         ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
  46         .endm
  47
  48         .macro ldr1b ptr reg cond=al abort
  49         notcond \cond, .+8
  50         ldb.w \reg, [\ptr]+, #1
  51         .endm
  52
  53         .macro str1w ptr reg abort
  54         strusr  \reg, \ptr, 4, abort=\abort
  55         .endm
  56
  57         .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
  58 100:    stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
  59
  60         .pushsection __ex_table, "a"
  61         .long 100b, \abort
  62         .popsection
  63         .endm
  64
  65         .macro str1b ptr reg cond=al abort
  66         strusr  \reg, \ptr, 1, \cond, abort=\abort
  67         .endm
  68
  69         .macro enter
  70         mov     r3, #0
  71         stm.w   (r0, r2, r3), [sp-]
  72         .endm
  73
  74         .macro exit
  75         add     sp, sp, #8
  76         ldm.w   (r0), [sp]+
  77         mov     pc, lr
  78         .endm
  79
  80         .text
  81
  82 WEAK(raw_copy_to_user)
  83
  84 #include "copy_template.S"
  85
  86 ENDPROC(raw_copy_to_user)
  87
  88         .pushsection .fixup,"ax"
  89         .align 0
  90         copy_abort_preamble
  91         ldm.w   (r1, r2, r3), [sp]+
  92         sub     r0, r0, r1
  93         rsub    r0, r0, r2
  94         copy_abort_end
  95         .popsection
  96