Service Manuals, User Guides, Schematic Diagrams or docs for : xerox mesa 4.0_1978 listing Mesa_4_System TrapDefs.mesa_Sep78

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TrapDefs.mosa                     2-Sep-78 18:05:56                      Page   1



-- TrapDefs.Mesa    Edited by Sandman on April 10, 1978   11:03 AM
DIRECTORY
  ControlDefs: FROM "controldefs";
DEFINITIONS FROM ControlDefs;
TrapDefs: DEFINITIONS   = BEGIN
  -- Faults
  StartFault: SIGNAL [dest: GlobalframeHandle];
  StackError: ERROR [FrameHandleJ;
  PortFault: ERROR;
  LinkageFault: ERROR;
  ControlFault: SIGNAL [source: FrameHandleJ RETURNS [ControlLinkJ;
  UnboundProcedure: SIGNAL [dest: Control Link] RETURNS [ControlLink];
  ParityError: SIGNAL [address: POINTER];
  PhantomParityError: SIGNAL;
  -- Signal Stuff
  SendMsgSignal: SIGNAL RETURNS [UNSPECIFIED, UNSPECIFIEDJ;
  ResumeError: SIGNAL;
  -- Xfer Trap Stuff
  TrapReason: TYPE = {other, localCall, return};
  TrapState: TYPE = {off, on, pending};
  TrapStatus: TYPE = MACHINE DEPENDENT RECORD [
    fill1: [O .. l77B],
    reason: TrapReason,
    fi112: [0 .. 37BJ,
    state: TrapStateJ;
  TrapParameter: TYPE = RECORD [
    SELECT OVERLAID * FROM
      other =) [
        link: ControlLink],
      localCall =) [
        ep: CARDINALJ,                Actually 2*ep+2
      return =) [
        frame: FrameHandleJ,          Actually frame+6
      ENDCASE];

  NullReason: TrapReason   = LOOPHOLE[O];
  TraceOff: TrapStatus = [0, NullReason, 0, off];
  TraceNext: TrapStatus = [0, NullReason, 0, pendingJ;
  END ...

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