arch/arm-raspi/exec/userstate.c

   1 /*
   2     Copyright © 2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: UserState() - Return to normal mode after changing things.
   6     Lang: english
   7 */
   8
   9 #include <proto/exec.h>
  10
  11 /* See rom/exec/userstate.c for documentation */
  12
  13 AROS_LH1(void, UserState,
  14     AROS_LHA(APTR, superSP, D0),
  15     struct ExecBase *, SysBase, 26, Exec)
  16 {
  17     AROS_LIBFUNC_INIT
  18
  19     if (superSP)
  20     {
  21         asm volatile (
  22             "       stmfd   sp!, {lr}               \n"
  23             "       mov     r1, sp                  \n"
  24             "       mov     sp, %[superSP]          \n"
  25             "       cpsie   i, %[mode_user]         \n"
  26             "       mov     sp, r1                  \n"
  27             "       ldmfd   sp!, {lr}               \n"
  28             : : [superSP] "r" (superSP), [mode_user] "I" (CPUMODE_USER) : "r1" );
  29     }
  30     AROS_LIBFUNC_EXIT
  31 } /* UserState() */