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; Copyright (C) 2000 Panagiotis Manolios
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
; This program is distributed in the hope that it will be useful,
; but 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 this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
; Written by Panagiotis Manolios who can be reached as follows.
; Email: pete@cs.utexas.edu
; Postal Mail:
; Department of Computer Science
; The University of Texas at Austin
; Austin, TX 78701 USA
#|
The ISA specification of Sawada's machine.
|#
(in-package "ACL2")
(include-book "../../top/alist-thms")
(include-book "../top/inst")
(defun ISA-state (pc regs mem)
(list 'ISA pc regs mem))
(defun ISA-p (x)
(equal (car x) 'ISA))
(defmacro ISA-pc () 1)
(defmacro ISA-regs () 2)
(defmacro ISA-mem () 3)
(defun add-rc (ra rb rc regs)
(update-valuation rc
(+ (value-of ra regs)
(value-of rb regs))
regs))
(defun sub-rc (ra rb rc regs)
(update-valuation rc
(- (value-of ra regs)
(value-of rb regs))
regs))
(defun ISA-add (rc ra rb ISA)
(ISA-state (1+ (nth (ISA-pc) ISA))
(add-rc ra rb rc (nth (ISA-regs) ISA))
(nth (ISA-mem) ISA)))
(defun ISA-sub (rc ra rb ISA)
(ISA-state (1+ (nth (ISA-pc) ISA))
(sub-rc ra rb rc (nth (ISA-regs) ISA))
(nth (ISA-mem) ISA)))
(defun ISA-default (ISA)
(ISA-state (1+ (nth (ISA-pc) ISA))
(nth (ISA-regs) ISA)
(nth (ISA-mem) ISA)))
(defun ISA-step (ISA)
(let ((inst (value-of (nth (ISA-pc) ISA) (nth (ISA-mem) ISA))))
(let ((op (nth (Inst-opcode) inst))
(rc (nth (Inst-rc) inst))
(ra (nth (Inst-ra) inst))
(rb (nth (Inst-rb) inst)))
(cond ((equal op 0) ; add
(ISA-add rc ra rb ISA))
((equal op 1) ; sub
(ISA-sub rc ra rb ISA))
(t (ISA-default ISA))))))
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