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Some debugging improvements

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This commit is contained in:
Jeff Parsons 2014-11-22 09:31:15 -08:00 • committed by jeffpar
commit a72d824548
7 changed files with 81 additions and 25 deletions
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49
modules/pcjs/lib/x86cpu.js
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@ -158,6 +158,20 @@ function X86CPU(parmsCPU) {
*/
this.setMemoryEnabled();
if (SAMPLER) {
/*
* For now, we're just going to sample EIP values
*/
this.nSamples = 50000;
this.nSampleFreq = 1;
this.nSampleSkip = 3183300;
this.aSamples = new Array(this.nSamples);
for (var i = 0; i < this.nSamples; i++) this.aSamples[i] = -1;
this.iSampleNext = 0;
this.iSampleFreq = 0;
this.iSampleSkip = 0;
}
/*
* This initial resetRegs() call is important to create all the registers (eg, the X86Seg registers),
* so that if/when we call restore(), it will have something to fill in.
@ -741,6 +755,12 @@ X86CPU.prototype.reset = function()
this.resetRegs();
this.resetCycles();
this.clearError(); // clear any fatal error/exception that setError() may have flagged
if (SAMPLER) {
this.iSampleNext = 0;
this.iSampleFreq = 0;
this.iSampleSkip = 0;
}
};
/**
@ -2526,6 +2546,35 @@ X86CPU.prototype.stepCPU = function(nMinCycles)
fDebugSkip = false;
}
if (SAMPLER) {
if (++this.iSampleFreq >= this.nSampleFreq) {
this.iSampleFreq = 0;
if (this.iSampleSkip < this.nSampleSkip) {
this.iSampleSkip++
} else {
if (this.iSampleNext == this.nSamples) {
this.println("sample buffer full");
this.stopCPU();
break;
}
var n = this.aSamples[this.iSampleNext];
if (n !== -1) {
if (n !== this.regEIP) {
this.println("sample deviation at index " + this.iSampleNext + ": current EIP=" + str.toHex(this.regEIP) + ", target EIP=" + str.toHex(n));
this.stopCPU();
break;
}
} else {
this.aSamples[this.iSampleNext] = this.regEIP;
}
if (this.iSampleNext == 112) {
fDebugSkip = false; // just some no-op statement we can set a breakpoint on
}
this.iSampleNext++;
}
}
}
this.opFlags = 0;
if (DEBUG || PREFETCH) {