arch/.unmaintained/dummy/userstate.c

   1 |*****************************************************************************
   2 |
   3 |   NAME
   4 |
   5 |       __AROS_LH1(void, UserState,
   6 |
   7 |   SYNOPSIS
   8 |       __AROS_LA(APTR, sysStack, D0),
   9 |
  10 |   LOCATION
  11 |       struct ExecBase *, SysBase, 26, Exec)
  12 |
  13 |   FUNCTION
  14 |       Return to user mode after a call to SuperState().
  15 |
  16 |   INPUTS
  17 |       sysStack - The returncode from SuperState().
  18 |
  19 |   RESULT
  20 |
  21 |   NOTES
  22 |
  23 |   EXAMPLE
  24 |
  25 |   BUGS
  26 |
  27 |   SEE ALSO
  28 |       SuperState(), Supervisor()
  29 |
  30 |   INTERNALS
  31 |
  32 |   HISTORY
  33 |
  34 |******************************************************************************
  35
  36         .globl  _Exec_UserState
  37 _Exec_UserState:
  38         | simply return if argument is NULL
  39         tstl    d0
  40         jne     nonzero
  41         rts
  42 nonzero:
  43         | Transfer sp
  44         movel   sp,usp
  45
  46         | Set old supervisor sp
  47         movel   d0,sp
  48
  49         | And return. This jumps directly to a rts.
  50         rte
  51