#| -*-Scheme-*-

$Id: instr1.scm,v 1.70 2003/02/14 18:28:02 cph Exp $

Copyright (c) 1988, 1989, 1999 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

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it under the terms of the GNU General Public License as published by
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WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with MIT/GNU Scheme; if not, write to the Free Software
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|#

;;;; 68000 Instruction Set Description
;;; Originally from GJS (who did the hard part).

(declare (usual-integrations))

;;; Effective Address description database

(define-ea-database
  ((D (? r)) (DATA ALTERABLE) #b000 r)

  ((A (? r)) (ALTERABLE) #b001 r)

  ((@A (? r)) (DATA MEMORY CONTROL ALTERABLE) #b010 r)

  ((@A+ (? r)) (DATA MEMORY ALTERABLE) #b011 r)

  ((@-A (? r)) (DATA MEMORY ALTERABLE) #b100 r)

  ((@AO (? r) (? o))
   (DATA MEMORY CONTROL ALTERABLE) #b101 r
   (output-16bit-offset o))

  ((@AR (? r) (? l))
   (DATA MEMORY CONTROL ALTERABLE) #b101 r
   (output-16bit-relative l))

  ((@AOX (? r) (? o) (? xtype da) (? xr) (? s wl))
   (DATA MEMORY CONTROL ALTERABLE) #b110 r
   (output-offset-index-register xtype xr s o))

  ((@ARX (? r) (? l) (? xtype da) (? xr) (? s wl))
   (DATA MEMORY CONTROL ALTERABLE) #b110 r
   (output-relative-index-register xtype xr s l))

  ((W (? a))
   (DATA MEMORY CONTROL ALTERABLE) #b111 #b000
   (output-16bit-address a))

  ((L (? a))
   (DATA MEMORY CONTROL ALTERABLE) #b111 #b001
   (output-32bit-address a))

  ((@PCO (? o))
   (DATA MEMORY CONTROL) #b111 #b010
   (output-16bit-offset o))

  ((@PCR.W (? l))
   (DATA MEMORY CONTROL) #b111 #b010
   (output-16bit-relative l))

  ((@PCOX (? o) (? xtype da) (? xr) (? s wl))
   (DATA MEMORY CONTROL) #b111 #b011
   (output-offset-index-register xtype xr s o))

  ((@PCRX (? l) (? xtype da) (? xr) (? s wl))
   (DATA MEMORY CONTROL) #b111 #b011
   (output-relative-index-register xtype xr s l))

  ((& (? i))
   (DATA MEMORY) #b111 #b100
   (output-immediate-data immediate-size i))

;;; 68020 only

  ;; These are common special cases of the full extension word forms below

  ((@D (? r))
   (DATA MEMORY CONTROL ALTERABLE) #b110 #b000
   (output-@D-indirect r))

  ((@DO (? r) (? o))
   (DATA MEMORY CONTROL ALTERABLE) #b110 #b000
   (output-@DO-indirect r o))

  ;; Brief format extension word addressing modes

  ;; These 2 are like @AOX and @ARX but accept a scale factor.
  ;; The index register is collected into a spec like ((D 4) L 2).

  ((@AOXS (? r) (? l) (((? xtype da) (? xr)) (? s wl) (? factor)))
   (DATA MEMORY CONTROL ALTERABLE) #b110 r
   (output-brief-format-extension-word xtype xr s factor l))

  ((@ARXS (? r) (? l) (((? xtype da) (? xr)) (? s wl) (? factor)))
   (DATA MEMORY CONTROL ALTERABLE) #b110 r
   (output-brief-format-extension-word xtype xr s factor `(- ,l *PC*)))

  ;; Similarly for @PCOX and @PCRX.

  ((@PCOXS (? o) (((? xtype da) (? xr)) (? s wl) (? factor)))
   (DATA MEMORY CONTROL) #b111 #b011
   (output-brief-format-extension-word xtype xr s factor o))

  ((@PCRXS (? l) (((? xtype da) (? xr)) (? s wl) (? factor)))
   (DATA MEMORY CONTROL) #b111 #b011
   (output-brief-format-extension-word xtype xr s factor `(- ,l *PC*)))

;;; Full format extension word addressing modes

  ((@AOF (? r) (? brs ze)
	 ((? bd) (? bdtype nwl)) (? memtype)
	 (((? xtype da) (? xr)) (? xsz wl) (? factor)) (? irs ze)
	 ((? od) (? odtype nwl)))
   (DATA MEMORY CONTROL ALTERABLE) #b110 r
   (output-full-format-extension-word xtype xr xsz factor
				      brs irs bdtype bd
				      memtype odtype od))

  ((@ARF (? r) (? brs ze)
	 ((? bd) (? bdtype nwl)) (? memtype)
	 (((? xtype da) (? xr)) (? xsz wl) (? factor)) (? irs ze)
	 ((? od) (? odtype nwl)))
   (DATA MEMORY CONTROL ALTERABLE) #b110 r
   (output-full-format-extension-word xtype xr xsz factor
				      brs irs bdtype `(- ,bd *PC*)
				      memtype odtype od))

  ((@PCOF (? pcs ze)
	 ((? bd) (? bdtype nwl)) (? memtype)
	 (((? xtype da) (? xr)) (? xsz wl) (? factor)) (? irs ze)
	 ((? od) (? odtype nwl)))
   (DATA MEMORY CONTROL) #b111 #b011
   (output-full-format-extension-word xtype xr xsz factor
				      pcs irs bdtype bd
				      memtype odtype od))

  ((@PCRF (? pcs ze)
	  ((? bd) (? bdtype nwl)) (? memtype)
	  (((? xtype da) (? xr)) (? xsz wl) (? factor)) (? irs ze)
	  ((? od) (? odtype nwl)))
   (DATA MEMORY CONTROL) #b111 #b011
   (output-full-format-extension-word xtype xr xsz factor
				      pcs irs bdtype `(- ,bd *PC*)
				      memtype odtype od))

;;; Optimized addressing modes.
;;; Only a subset of those that can be optimized.

  ((@PCR (? l))
   (DATA MEMORY CONTROL)
   (POSITION-DEPENDENT label
    #b111
    (FIELD (offset `(- ,l ,label))
	   ((-32768 32767) #b010)
	   ((() ()) #b011))
    (VARIABLE-EXTENSION (offset `(- ,l ,label))
			((-32768 32767)
			 16
			 (EXTENSION-WORD (16 offset SIGNED)))
			((() ())
			 48
			 (output-32bit-offset offset))))))

;;;; Effective address transformers (restrictions)

(define-ea-transformer ea-all)

(define-ea-transformer ea-d (DATA))
(define-ea-transformer ea-a (ALTERABLE))
(define-ea-transformer ea-c (CONTROL))

(define-ea-transformer ea-d&a (DATA ALTERABLE))
(define-ea-transformer ea-c&a (CONTROL ALTERABLE))
(define-ea-transformer ea-m&a (MEMORY ALTERABLE))

(define-ea-transformer ea-d&-& (DATA) (&))
(define-ea-transformer ea-all-A () (A))

(define-ea-transformer ea-d/c () (A @A+ @-A &))
(define-ea-transformer ea-d/c&a (ALTERABLE) (A @A+ @-A &))

;;;; Special purpose transformers

(define-symbol-transformer da    (D . 0) (A . 1))
(define-symbol-transformer nwl   (N . 1) (W . 2) (L . 3))
(define-symbol-transformer bwlq  (B . 0) (W . 1) (L . 2) (Q . 3))
(define-symbol-transformer bwl-b (W . 1) (L . 2))
(define-symbol-transformer bwl
  (B . 0) (W . 1) (L . 2) (UB . 0) (UW . 1) (UL . 2))
(define-symbol-transformer bw    (B . 0) (W . 1))
(define-symbol-transformer wl    (W . 0) (L . 1))
(define-symbol-transformer lw    (W . 1) (L . 0) (UW . 1) (UL . 0))
(define-symbol-transformer rl    (R . 0) (L . 1))
(define-symbol-transformer us    (U . 0) (S . 1))
(define-symbol-transformer chkwl (W . 6) (L . 4))
(define-symbol-transformer bwl+1 (B . 1) (W . 2) (L . 3))
(define-symbol-transformer wl+2  (W . 2) (L . 3))
(define-symbol-transformer ze    (Z . 1) (E . 0))

(define-symbol-transformer cc
  (T . 0) (F . 1) (HI . 2) (LS . 3) (HS . 4) (LO . 5)
  (CC . 4) (CS . 5) (NE . 6) (EQ . 7) (VC . 8) (VS . 9)
  (PL . 10) (MI . 11) (GE . 12) (LT . 13) (GT . 14) (LE . 15))

(define-reg-list-transformer @+reg-list
  (A7 . 0) (A6 . 1) (A5 . 2) (A4 . 3) (A3 . 4) (A2 . 5) (A1 . 6) (A0 . 7)
  (D7 . 8) (D6 . 9) (D5 . 10) (D4 . 11) (D3 . 12) (D2 . 13)
  (D1 . 14) (D0 . 15))

(define-reg-list-transformer @-reg-list
  (D0 . 0) (D1 . 1) (D2 . 2) (D3 . 3) (D4 . 4) (D5 . 5) (D6 . 6) (D7 . 7)
  (A0 . 8) (A1 . 9) (A2 . 10) (A3 . 11) (A4 . 12) (A5 . 13)
  (A6 . 14) (A7 . 15))

;; Control registers for 68010 and 68020

(define-symbol-transformer cont-reg
  (SFC . #x000) (DFC . #x001) (USP . #x800) (VBR . #x801)
  ;; The ones below are for the 68020 only.
  (CACR . #x002) (CAAR . #x802) (MSP . #x803) (ISP . #x804))

