155 lines
4.3 KiB
JavaScript
155 lines
4.3 KiB
JavaScript
/**
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* @fileoverview Implements PDP11 opcode handlers.
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* @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
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* @version 1.0
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* Created 2016-Sep-03
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*
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* This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
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*
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* It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
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* (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html. This code
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* may be used freely provided the original author name is acknowledged in any modified source code.
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*
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* PCjs is free software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation, either version 3
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* of the License, or (at your option) any later version.
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*
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* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCjs. If not,
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* see <http://www.gnu.org/licenses/gpl.html>.
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*
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* You are required to include the above copyright notice in every source code file of every
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* copy or modified version of this work, and to display that copyright notice on every screen
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* that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).
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*
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* Some PCjs files also attempt to load external resource files, such as character-image files,
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* ROM files, and disk image files. Those external resource files are not considered part of PCjs
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* for purposes of the GNU General Public License, and the author does not claim any copyright
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* as to their contents.
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*/
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"use strict";
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if (NODE) {
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var str = require("../../shared/lib/strlib");
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var PDP11 = require("./defines");
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var MessagesPDP11 = require("./messages");
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}
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/**
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* fnBIC(dst, src)
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*
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* @param {number} src
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* @param {number} dst
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* @return {number} (~src & dst)
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*/
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PDP11.fnBIC = function(src, dst)
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{
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return ~src & dst;
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};
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/**
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* op1170(opCode)
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*
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* @this {CPUStatePDP11}
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* @param {number} opCode
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*/
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PDP11.op1170 = function(opCode)
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{
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PDP11.aOpsF000_1170[opCode >> 12].call(this, opCode);
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};
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/**
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* op0XXX_1170(opCode)
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*
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* @this {CPUStatePDP11}
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* @param {number} opCode
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*/
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PDP11.op0XXX_1170 = function(opCode)
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{
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// PDP11.aOpsF000_1170[opCode >> 12].call(this, opCode);
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};
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/**
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* opMOV(opCode)
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*
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* @this {CPUStatePDP11}
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* @param {number} opCode
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*/
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PDP11.opMOV = function(opCode)
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{
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this.updateNZFlags(this.writeWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT)));
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this.nStepCycles -= 1;
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};
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/**
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* opCMP(opCode)
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*
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* @this {CPUStatePDP11}
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* @param {number} opCode
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*/
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PDP11.opCMP = function(opCode)
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{
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var src = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
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var dst = this.readWordByMode(opCode);
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var result = src - dst;
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this.updateAllFlags(result, src, dst);
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this.nStepCycles -= 1;
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};
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/**
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* opBIT(opCode)
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*
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* @this {CPUStatePDP11}
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* @param {number} opCode
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*/
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PDP11.opBIT = function(opCode)
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{
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this.updateNZFlags(this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT) & this.readWordByMode(opCode));
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this.nStepCycles -= 1;
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};
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/**
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* opBIC(opCode)
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*
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* @this {CPUStatePDP11}
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* @param {number} opCode
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*/
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PDP11.opBIC = function(opCode)
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{
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this.updateNZFlags(this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBIC));
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this.nStepCycles -= 1;
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};
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/**
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* opNOP(opCode)
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*
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* @this {CPUStatePDP11}
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* @param {number} opCode
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*/
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PDP11.opNOP = function(opCode)
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{
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this.nStepCycles -= 1;
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};
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PDP11.aOpsF000_1170 = [
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PDP11.op0XXX_1170,
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PDP11.opMOV, // MOV 01SSDD
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PDP11.opCMP, // CMP 02SSDD
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PDP11.opBIT, // BIT 03SSDD
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PDP11.opBIC, // BIC 04SSDD
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PDP11.opNOP, // 0x5XXX
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PDP11.opNOP, // 0x6XXX
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PDP11.opNOP, // 0x7XXX
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PDP11.opNOP, // 0x8XXX
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PDP11.opNOP, // 0x9XXX
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PDP11.opNOP, // 0xAXXX
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PDP11.opNOP, // 0xBXXX
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PDP11.opNOP, // 0xCXXX
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PDP11.opNOP, // 0xDXXX
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PDP11.opNOP, // 0xEXXX
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PDP11.opNOP // 0xFXXX
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];
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