root/arch/nds32/lib/copy_from_user.S

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2005-2017 Andes Technology Corporation
   3 
   4 #include <linux/linkage.h>
   5 #include <asm/assembler.h>
   6 #include <asm/errno.h>
   7 
   8 .macro  lbi1 dst, addr, adj
   9 USER( lbi.bi, \dst, [\addr], \adj)
  10 .endm
  11 
  12 .macro  sbi1 src, addr, adj
  13 sbi.bi  \src, [\addr], \adj
  14 .endm
  15 
  16 .macro  lmw1 start_reg, addr, end_reg
  17 USER( lmw.bim, \start_reg, [\addr], \end_reg)
  18 .endm
  19 
  20 .macro  smw1 start_reg, addr, end_reg
  21 smw.bim \start_reg, [\addr], \end_reg
  22 .endm
  23 
  24 
  25 /* Prototype: int __arch_copy_from_user(void *to, const char *from, size_t n)
  26  * Purpose  : copy a block from user memory to kernel memory
  27  * Params   : to   - kernel memory
  28  *          : from - user memory
  29  *          : n    - number of bytes to copy
  30  * Returns  : Number of bytes NOT copied.
  31  */
  32 
  33 .text
  34 ENTRY(__arch_copy_from_user)
  35         add     $r5, $r0, $r2
  36 #include "copy_template.S"
  37         move    $r0, $r2
  38         ret
  39 .section .fixup,"ax"
  40 .align  2
  41 9001:
  42         sub     $r0, $r5, $r0
  43         ret
  44 .previous
  45 ENDPROC(__arch_copy_from_user)