arch/m32r/lib/putuser.S

   1 /*
   2  * __put_user functions.
   3  *
   4  * (C) Copyright 1998 Linus Torvalds
   5  * (C) Copyright 2001 Hirokazu Takata
   6  *
   7  * These functions have a non-standard call interface
   8  * to make them more efficient.
   9  */
  10
  11 #include <linux/config.h>
  12
  13 /*
  14  * __put_user_X
  15  *
  16  * Inputs:      r0 contains the address
  17  *              r1 contains the value
  18  *
  19  * Outputs:     r0 is error code (0 or -EFAULT)
  20  *              r1 is corrupted (will contain "current_task").
  21  *
  22  * These functions should not modify any other registers,
  23  * as they get called from within inline assembly.
  24  */
  25
  26 #ifdef CONFIG_ISA_DUAL_ISSUE
  27
  28         .text
  29         .balign 4
  30         .globl __put_user_1
  31 __put_user_1:
  32 1:      stb     r1, @r0             ||  ldi     r0, #0
  33         jmp     r14
  34
  35         .balign 4
  36         .globl __put_user_2
  37 __put_user_2:
  38 2:      sth     r1, @r0             ||  ldi     r0, #0
  39         jmp     r14
  40
  41         .balign 4
  42         .globl __put_user_4
  43 __put_user_4:
  44 3:      st      r1, @r0             ||  ldi     r0, #0
  45         jmp     r14
  46
  47 bad_put_user:
  48         ldi     r0, #-14            ||  jmp     r14
  49
  50 #else /* not CONFIG_ISA_DUAL_ISSUE */
  51
  52         .text
  53         .balign 4
  54         .globl __put_user_1
  55 __put_user_1:
  56 1:      stb     r1, @r0
  57         ldi     r0, #0
  58         jmp     r14
  59
  60         .balign 4
  61         .globl __put_user_2
  62 __put_user_2:
  63 2:      sth     r1, @r0
  64         ldi     r0, #0
  65         jmp     r14
  66
  67         .balign 4
  68         .globl __put_user_4
  69 __put_user_4:
  70 3:      st      r1, @r0
  71         ldi     r0, #0
  72         jmp     r14
  73
  74 bad_put_user:
  75         ldi     r0, #-14
  76         jmp     r14
  77
  78 #endif /* not CONFIG_ISA_DUAL_ISSUE */
  79
  80 .section __ex_table,"a"
  81         .long 1b,bad_put_user
  82         .long 2b,bad_put_user
  83         .long 3b,bad_put_user
  84 .previous