;;; -*- Mode:LISP; Package:NEW-MATH; Base:10; Readtable:CL -*-

;***************************************************************************
;  Main handler for datatype and overflow traps
;***************************************************************************

(defun trap:dt-and-ovf-trap-handler-1 ()
  (let* ((save-sstep   (vinc:disable-single-step-trap))
	 (save-async   (vinc:disable-asynchronous-traps))
	 (save-pc      gr::*save-trap-pc*)
	 (save-pc+     gr::*save-trap-pc+*)
	 (save-oreg    gr::*save-oreg*)
	 (save-jcond   gr::*save-jcond*)
	 (save-status  gr::*save-status*)
	 (save-left    gr::*save-left*)
	 (save-right   gr::*save-right*)
	 (save-q       (hw:read-q-register))
	 (memstat      (hw:read-memory-status))
	 (vma          (hw:read-vma))
	 (md (progn
	       (when (= hw:$$wmd-valid (hw:ldb memstat hw:%%memory-status-md-written-lately 0))
		 (hw:vma-start-write-no-gc-trap-unboxed trap:*magic-garbage-location*)
		 (hw:memory-wait)
		 (hw:vma-start-read-no-transport-vma-unboxed-md-unboxed trap:*magic-garbage-location*)
		 (hw:read-md))
	       (trap:trap-on)
	       (hw:read-md))))
    (if (k2:this-is-a-breakpoint? save-pc)
	(progn
;	  (nubus-stuff:acknowledge-debugger-trap)
;	  (hw:read-md)				;force ack
	  (restore-asynchronous-traps save-async)
	  (k2:kbug-trap-handler-2 save-pc save-left save-right save-status vma md memstat)
	  (hw:read-md)
	  (hw:nop)
	  (hw:trap-off)
	  (vinc:restore-single-step-trap
	    (hw:ldb (k2:kbug-vm-read k2:kbug-flag-addr) k2:%%kbug-trace-flag 0))
	  (setq gr:*kbug-trap* 1))
      (progn
	(restore-asynchronous-traps save-async)
	(multiple-value-bind (answer result-status)
	    (trap:dt-and-ovf-trap-handler-2 save-pc save-left save-right save-status)
	  (hw:read-md)
	  (hw:nop)
	  (hw:trap-off)
	  (vinc:restore-single-step-trap save-sstep)
	  (setq gr:*kbug-trap* nil)
	  (setq gr::*save-right* answer)
	  (setq gr::*trap-temp3* answer)
	  (setq gr::*trap-temp4* gr:*save-right*)
	  (setq gr::*save-status*  result-status))))
    (setq gr::*save-trap-pc*      save-pc)
    (setq gr::*save-trap-pc+*     save-pc+)
    (setq gr::*save-oreg*    save-oreg)
    (setq gr::*save-jcond*   save-jcond)
    (hw:load-q-register save-q)
    (hw:write-md-unboxed md)
    (hw:vma-start-write-no-gc-trap-unboxed trap:*magic-garbage-location*)
    (vmem:write-md-generic md
			   (hw:ldb-not memstat hw:%%memory-status-md-not-boxed-bit 0))
    (vmem:write-vma-generic vma
			    (hw:ldb-not memstat hw:%%memory-status-vma-not-boxed-bit 0))))



;; This is just for convenience till the real datatype trap handler get warm loaded.
;;
(defun trap:dt-and-ovf-trap-handler-2 (save-pc save-left save-right save-status)
  (li:error "Datatype trap handling not loaded yet!" save-pc save-left save-right))