arch/m32r/lib/getuser.S

   1 /*
   2  * __get_user functions.
   3  *
   4  * (C) Copyright 2001 Hirokazu Takata
   5  *
   6  * These functions have a non-standard call interface
   7  * to make them more efficient, especially as they
   8  * return an error value in addition to the "real"
   9  * return value.
  10  */
  11
  12 #include <linux/config.h>
  13
  14 /*
  15  * __get_user_X
  16  *
  17  * Inputs:      r0 contains the address
  18  *
  19  * Outputs:     r0 is error code (0 or -EFAULT)
  20  *              r1 contains zero-extended value
  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 __get_user_1
  31 __get_user_1:
  32 1:      ldub    r1, @r0             ||  ldi     r0, #0
  33         jmp     r14
  34
  35         .balign 4
  36         .globl __get_user_2
  37 __get_user_2:
  38 2:      lduh    r1, @r0             ||  ldi     r0, #0
  39         jmp     r14
  40
  41         .balign 4
  42         .globl __get_user_4
  43 __get_user_4:
  44 3:      ld      r1, @r0             ||  ldi     r0, #0
  45         jmp     r14
  46
  47 bad_get_user:
  48         ldi     r1, #0              ||  ldi     r0, #-14
  49         jmp     r14
  50
  51 #else /* not CONFIG_ISA_DUAL_ISSUE */
  52
  53         .text
  54         .balign 4
  55         .globl __get_user_1
  56 __get_user_1:
  57 1:      ldub    r1, @r0
  58         ldi     r0, #0
  59         jmp     r14
  60
  61         .balign 4
  62         .globl __get_user_2
  63 __get_user_2:
  64 2:      lduh    r1, @r0
  65         ldi     r0, #0
  66         jmp     r14
  67
  68         .balign 4
  69         .globl __get_user_4
  70 __get_user_4:
  71 3:      ld      r1, @r0
  72         ldi     r0, #0
  73         jmp     r14
  74
  75 bad_get_user:
  76         ldi     r1, #0
  77         ldi     r0, #-14
  78         jmp     r14
  79
  80 #endif /* not CONFIG_ISA_DUAL_ISSUE */
  81
  82 .section __ex_table,"a"
  83         .long 1b,bad_get_user
  84         .long 2b,bad_get_user
  85         .long 3b,bad_get_user
  86 .previous
  87
  88         .end