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; X86ISA Library
; Note: The license below is based on the template at:
; http://opensource.org/licenses/BSD-3-Clause
; Copyright (C) 2015, Regents of the University of Texas
; All rights reserved.
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions are
; met:
; o Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
; o Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
; o Neither the name of the copyright holders nor the names of its
; contributors may be used to endorse or promote products derived
; from this software without specific prior written permission.
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
; HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
; Original Author(s):
; Shilpi Goel <shigoel@cs.utexas.edu>
(in-package "X86ISA")
(include-book "../../../codewalker/codewalker")
(include-book "app-view/user-level-memory-utils" :dir :proof-utils :ttags :all)
(local (include-book "centaur/bitops/ihs-extensions" :dir :system))
(local (include-book "centaur/bitops/signed-byte-p" :dir :system))
;; ----------------------------------------------------------------------
;; Codewalker requires the run function to have x86 as the 0th formal.
;; Our old run function, x86-run, has x86 as the 1st formal, so we
;; define x86-run-alt below for use with Codewalker.
(define x86-run-alt
(x86 (n :type (unsigned-byte 59)))
:parents (x86-decoder)
:enabled t
:returns (x86 x86p :hyp (x86p x86))
:measure (nfix n)
(cond ((fault x86) x86)
((ms x86) x86)
((mbe :logic (zp n) :exec (equal 0 n))
x86)
(t (let* ((x86 (x86-fetch-decode-execute x86))
(n (the (unsigned-byte 59) (1- n))))
(x86-run-alt x86 n))))
///
(local (in-theory (e/d* (binary-clk+) ())))
(defthm x86-run-alt-halted
(implies (or (ms x86) (fault x86))
(equal (x86-run-alt x86 n) x86)))
(defthm x86-run-alt-opener-not-ms-not-fault-zp-n
(implies (and (syntaxp (quotep n))
(zp n))
(equal (x86-run-alt x86 n) x86)))
(defthm x86-run-alt-opener-not-ms-not-zp-n
(implies (and (not (ms x86))
(not (fault x86))
(syntaxp (quotep n))
(not (zp n)))
(equal (x86-run-alt x86 n)
(x86-run-alt (x86-fetch-decode-execute x86) (1- n)))))
;; To enable compositional reasoning, we prove the following two
;; theorems:
(defthm x86-run-alt-plus
(implies (and (natp n1)
(natp n2)
(syntaxp (quotep n1)))
(equal (x86-run-alt x86 (clk+ n1 n2))
(x86-run-alt (x86-run-alt x86 n1) n2)))))
;; ----------------------------------------------------------------------
;; Sanity check: Small working example of x86isa+Codewalker
(local
(encapsulate
()
(defconst *program*
'(#xf8 ;; CLC
#xf9 ;; STC
))
(defun-nx clc-stc-hyps (x86)
(and
;; The x86 state is well-formed.
(x86p x86)
(64-bit-modep x86)
;; The model is operating in the application-level view.
(app-view x86)
(equal (rip x86) 0) ;; Added for codewalker
;; The program is located at linear addresses ranging from (rip
;; x86) to (+ -1 (len *program*) (rip x86)).
(program-at (rip x86) *program* x86)
;; The addresses where the program is located are canonical.
(canonical-address-p (rip x86))
(canonical-address-p (+ (len *program*) (rip x86)))
;; The initial state is error-free.
(equal (ms x86) nil)
(equal (fault x86) nil)))
(acl2::def-model-api
;; Codewalker requires the run function to have x86 as the 0th
;; formal...
:run x86-run-alt ;; the run function of the model
:svar x86 ;; name of state variable
:stobjp T ;; and whether it's a stobj
:hyps ((clc-stc-hyps x86)) ;; invariant to assume about state
:step x86-fetch-decode-execute ;; name of step function
:get-pc (lambda (x86) (xr :rip nil x86)) ;; how to fetch the pc
:put-pc (lambda (v x86) (xw :rip nil v x86)) ;; how to set the pc
;; the ``drivers'' below specify how to dive through updaters (and
;; constructors) and their accessors
;; The variables of the updater term should be a superset of those of
;; the accessor term.
:updater-drivers (((XW FLD I :VALUE :BASE)
(XR FLD I :BASE))
((WB N ADDR R-W-X :VALUE :BASE)
(RB N ADDR R-W-X :BASE)))
:constructor-drivers nil
:state-comps-and-types nil
:callp nil ;; recognizer fn for states with pc on call instruction
:ret-pc nil ;; how to fetch the return pc after a call
:returnp nil ;; recognizer for states with pc on return instruction
:clk+ binary-clk+ ; how to add two clocks
:name-print-base nil ; base to use for pcs appearing in names
; (2, 8, 10, or 16)
; how to generate variable names from state comps
:var-names nil
)
(local (in-theory (e/d* (x86-cmc/clc/stc/cld/std
x86-operation-mode)
(create-canonical-address-list
(create-canonical-address-list)))))
(acl2::def-semantics
:init-pc 0
:focus-regionp (lambda (pc) (and (<= 0 pc) (<= pc 1)))
:root-name nil ; optional - to change the fn names chosen
;; :hyps+ ((program1p s)) ; optional - to strengthen the :hyps of API
:annotations nil ; optional - to modify output generated
)))
;; ----------------------------------------------------------------------
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