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SRC operands must be fetched before DST operands

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Jeff 2016-10-03 16:50:39 -07:00 • committed by Jeff Parsons
commit a254abc7dc
6 changed files with 382 additions and 372 deletions
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66
modules/pdp11/lib/cpuops.js
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@ -499,7 +499,7 @@ PDP11.opASH = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties will be updated instead of the dstMode and dstReg properties.
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var src = this.readWordByMode(opCode);
var reg = (opCode >> 6) & 7;
@ -538,7 +538,7 @@ PDP11.opASHC = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties will be updated instead of the dstMode and dstReg properties.
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var src = this.readWordByMode(opCode);
var reg = (opCode >> 6) & 7;
@ -702,13 +702,18 @@ PDP11.opBIT = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before we READ the SRCMODE field of opCode.
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readWordByMode(opCode);
var dstMode = this.srcMode;
var dstReg = this.srcReg;
this.updateNZVFlags(this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT) & dst);
this.nStepCycles -= (dstMode? (3 + 1) + (this.srcReg && dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (dstReg == 7? 2 : 0));
this.updateNZVFlags(src & dst);
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
};
/**
@ -721,13 +726,18 @@ PDP11.opBITB = function(opCode)
{
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before we READ the SRCMODE field of opCode.
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT);
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readByteByMode(opCode);
var dstMode = this.srcMode;
var dstReg = this.srcReg;
this.updateNZVFlags((this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT) & dst) << 8);
this.nStepCycles -= (dstMode? (3 + 1) + (this.srcReg && dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (dstReg == 7? 2 : 0));
this.updateNZVFlags((src & dst) << 8);
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
};
/**
@ -985,19 +995,23 @@ PDP11.opCMP = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before we READ the SRCMODE field of opCode.
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readWordByMode(opCode);
var dstMode = this.srcMode;
var dstReg = this.srcReg;
var src = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
var result = src - dst;
/*
* NOTE: CMP calculates (src - dst) rather than (dst - src), so when we call updateSubFlags(),
* we must reverse the order of the src and dst parameters.
*/
this.updateSubFlags(result, dst, src);
this.nStepCycles -= (dstMode? (3 + 1) + (this.srcReg && dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (dstReg == 7? 2 : 0));
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
};
/**
@ -1010,19 +1024,23 @@ PDP11.opCMPB = function(opCode)
{
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties need to be copied before we READ the SRCMODE field of opCode.
* the srcMode and srcReg properties need to be copied before they get overwritten.
*/
var src = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT) << 8;
var srcMode = this.srcMode;
var srcReg = this.srcReg;
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var dst = this.readByteByMode(opCode) << 8;
var dstMode = this.srcMode;
var dstReg = this.srcReg;
var src = this.readByteByMode(opCode >> PDP11.SRCMODE.SHIFT) << 8;
var result = src - dst;
/*
* NOTE: CMP calculates (src - dst) rather than (dst - src), so when we call updateSubFlags(),
* we must reverse the order of the src and dst parameters.
*/
this.updateSubFlags(result, dst, src);
this.nStepCycles -= (dstMode? (3 + 1) + (this.srcReg && dstReg >= 6? 1 : 0) : (this.srcMode? (3 + 1) : (2 + 1)) + (dstReg == 7? 2 : 0));
this.nStepCycles -= (this.srcMode? (3 + 1) + (srcReg && this.srcReg >= 6? 1 : 0) : (srcMode? (3 + 1) : (2 + 1)) + (this.srcReg == 7? 2 : 0));
};
/**
@ -1698,7 +1716,7 @@ PDP11.opTST = function(opCode)
{
/*
* NOTE: Because readWordByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties will be updated instead of the dstMode and dstReg properties.
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var result = this.readWordByMode(opCode);
this.assert(!(result & ~0xffff)); // assert that C flag will be clear
@ -1716,7 +1734,7 @@ PDP11.opTSTB = function(opCode)
{
/*
* NOTE: Because readByteByMode() is being used to READ (not WRITE) the DSTMODE field of opCode,
* the srcMode and srcReg properties will be updated instead of the dstMode and dstReg properties.
* this.srcMode and this.srcReg must be used instead of this.dstMode and this.dstReg.
*/
var result = this.readByteByMode(opCode);
this.assert(!(result & ~0xff)); // assert that C flag will be clear