More decoding functions
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Jeff
Jeff Parsons
parent
7f0b6a091d
commit
9d045008a3
6 changed files with 672 additions and 512 deletions
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@ -39,16 +39,64 @@ if (NODE) {
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var MessagesPDP11 = require("./messages");
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}
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/**
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* fnADD(dst, src)
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*
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* @this {CPUStatePDP11}
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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.fnADD = function(src, dst)
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{
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var result = src + dst;
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this.updateAddFlags(result, src, dst);
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return result & 0xffff;
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};
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/**
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* fnBIC(dst, src)
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*
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* @this {CPUStatePDP11}
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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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var result = ~src & dst;
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this.updateNZFlags(result);
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return result;
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};
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/**
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* fnBIS(dst, src)
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*
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* @this {CPUStatePDP11}
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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.fnBIS = function(src, dst)
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{
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var result = src | dst;
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this.updateNZFlags(result);
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return result;
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};
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/**
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* fnSUB(dst, src)
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*
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* @this {CPUStatePDP11}
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* @param {number} src
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* @param {number} dst
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* @return {number} (dst - src)
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*/
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PDP11.fnSUB = function(src, dst)
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{
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var result = dst - src;
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this.updateSubFlags(result, src, dst);
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return result & 0xffff;
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};
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/**
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@ -74,29 +122,38 @@ PDP11.op0XXX_1170 = function(opCode)
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};
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/**
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* opMOV(opCode)
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* opADD(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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PDP11.opADD = 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.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnADD);
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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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* 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.opCMP = function(opCode)
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PDP11.opBIC = 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.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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* opBIS(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.opBIS = function(opCode)
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{
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this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBIS);
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this.nStepCycles -= 1;
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};
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@ -113,14 +170,49 @@ PDP11.opBIT = function(opCode)
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};
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/**
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* opBIC(opCode)
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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.opBIC = function(opCode)
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PDP11.opCMP = 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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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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/*
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* NOTE: CMP calculates (src - dst) rather than (dst - src), so when we call updateSubFlags(),
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* we must reverse the order of the src and dst parameters.
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*/
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this.updateSubFlags(result, dst, src);
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this.nStepCycles -= 1;
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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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* opMOVB(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.opMOVB = function(opCode)
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{
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var data = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT);
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/*
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* When dst is a register, data must be sign-extended; otherwise, sign-extension is unnecessary (but harmless).
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*/
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this.updateNZFlags(this.writeByteByMode(opCode, (data & 0x80)? data | 0xff00 : data));
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this.nStepCycles -= 1;
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};
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@ -135,21 +227,33 @@ PDP11.opNOP = function(opCode)
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this.nStepCycles -= 1;
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};
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/**
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* opSUB(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.opSUB = function(opCode)
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{
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this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnSUB);
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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.opBIS, // BIS 05SSDD
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PDP11.opADD, // ADD 06SSDD
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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.opMOVB, // MOVB 11SSDD
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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.opSUB, // SUB 16SSDD
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PDP11.opNOP // 0xFXXX
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];
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