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; Copyright (C) 2023, ForrestHunt, Inc.
; Written by Matt Kaufmann
; License: A 3-clause BSD license. See the LICENSE file distributed with ACL2.
; This file assumes that events in mem.lisp have been evaluated up to the point
; where this file is loaded with include-raw.
(in-package "ACL2")
(defg *special-address-list* '(10 30 50))
; We won't use the following two, but we could avoid having to look up the old
; definitions if we use them with funcall. I can explain further if asked.
(defvar *old-ari* (symbol-function 'ari))
(defvar *old-update-ari* (symbol-function 'update-ari))
; Implementation note:
; Here are the original raw Lisp definitions, obtained by evaluating
; (trace$ defstobj-raw-defs)
; before evaluating the defstobj for in mem.lisp
#|
(defun ari (i mem)
(declare (type (and fixnum (integer 0 *)) i))
(the$ (unsigned-byte 8)
(aref (the (simple-array (unsigned-byte 8) (*))
mem)
(the (and fixnum (integer 0 *)) i))))
(defun update-ari (i v mem)
(declare (type (and fixnum (integer 0 *)) i)
(type (unsigned-byte 8) v))
(progn (memoize-flush nil)
(setf (aref (the (simple-array (unsigned-byte 8) (*))
mem)
(the (and fixnum (integer 0 *)) i))
(the$ (unsigned-byte 8) v))
mem))
|#
; Now we modify the definitions above to account for special behavior for
; addresses in the list *special-address-list*.
(defun ari (i mem)
(declare (type (and fixnum (integer 0 *)) i))
(cond
((member i *special-address-list*)
(cw "~|NOTE: Returning result for read at special address ~x0.~|~%"
i)
(the$ (unsigned-byte 8)
(mod (1+ i) 256)))
(t (the$ (unsigned-byte 8)
(aref (the (simple-array (unsigned-byte 8) (*))
mem)
(the (and fixnum (integer 0 *)) i))))))
(defun update-ari (i v mem)
; Cause a side effect based on i. Note that this function isn't intended to
; affect what is returned by write-mem -- it's only for side effect.
(declare (type (and fixnum (integer 0 *)) i)
(type (unsigned-byte 8) v))
(when (member i *special-address-list*)
(cw "~|NOTE: Calling update-ari on special address ~x0.~|~%"
i))
(progn (memoize-flush nil)
(setf (aref (the (simple-array (unsigned-byte 8) (*))
mem)
(the (and fixnum (integer 0 *)) i))
(the$ (unsigned-byte 8) v))
mem))
|
