Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Limited Debug register support

Browse source
This commit is contained in:
Jeff Parsons 2015-08-02 21:11:19 -07:00
commit 9fa2941394
7 changed files with 168 additions and 85 deletions
Download patch file Download diff file Expand all files Collapse all files

56
modules/pcjs/lib/x86op0f.js
View file

@ -338,7 +338,7 @@ X86.opMOVrc = function MOVrc()
*/
if (this.nCPL) {
/*
* You're not allowed to read control registers if the current privilege level is not zero
* You're not allowed to read control registers if the current privilege level is not zero.
*/
X86.fnFault.call(this, X86.EXCEPTION.GP_FAULT, 0);
return;
@ -366,7 +366,7 @@ X86.opMOVrc = function MOVrc()
this.nStepCycles -= 6;
/*
* TODO: Implement BACKTRACK for this instruction (although Control registers are not likely to be a conduit for much interesting data).
* TODO: Implement BACKTRACK for this instruction (although Control registers are not likely to be a conduit for interesting data).
*/
};
@ -387,7 +387,7 @@ X86.opMOVrd = function MOVrd()
*/
if (this.nCPL) {
/*
* You're not allowed to read control registers if the current privilege level is not zero
* You're not allowed to read control registers if the current privilege level is not zero.
*/
X86.fnFault.call(this, X86.EXCEPTION.GP_FAULT, 0);
return;
@ -406,7 +406,7 @@ X86.opMOVrd = function MOVrd()
this.nStepCycles -= 22;
/*
* TODO: Implement BACKTRACK for this instruction (although Debug registers are not likely to be a conduit for much interesting data).
* TODO: Implement BACKTRACK for this instruction (although Debug registers are not likely to be a conduit for interesting data).
*/
};
@ -436,7 +436,7 @@ X86.opMOVcr = function MOVcr()
*/
if (this.nCPL) {
/*
* You're not allowed to write control registers if the current privilege level is not zero
* You're not allowed to write control registers if the current privilege level is not zero.
*/
X86.fnFault.call(this, X86.EXCEPTION.GP_FAULT, 0);
return;
@ -464,7 +464,7 @@ X86.opMOVcr = function MOVcr()
}
/*
* TODO: Implement BACKTRACK for this instruction (although Control registers are not likely to be a conduit for much interesting data).
* TODO: Implement BACKTRACK for this instruction (although Control registers are not likely to be a conduit for interesting data).
*/
};
@ -485,7 +485,7 @@ X86.opMOVdr = function MOVdr()
*/
if (this.nCPL) {
/*
* You're not allowed to write control registers if the current privilege level is not zero
* You're not allowed to write control registers if the current privilege level is not zero.
*/
X86.fnFault.call(this, X86.EXCEPTION.GP_FAULT, 0);
return;
@ -498,38 +498,18 @@ X86.opMOVdr = function MOVdr()
X86.opUndefined.call(this);
return;
}
var regDR = this.getReg(bModRM & 0x7);
if (iDst == 7) {
var regDR7 = this.regDR[7];
if ((regDR ^ regDR7) & X86.DR7.ENABLE) {
/*
* We need to check changes to the Debug Control Register (DR7); specifically, if any of
* DR0-DR3 are transitioning from disabled to enabled, or vice versa, then we need to call
* addMemCheck(), or removeMemCheck(), as appropriate.
*/
var bitsEnabled = X86.DR7.L0 | X86.DR7.G0;
var bitsRWMask = 0x00030000;
for (var i = 0; i < 4; i++) {
var fEnabled = (regDR & bitsEnabled);
if (!fEnabled != !(regDR7 & bitsEnabled)) {
var bitsRW = (regDR & bitsRWMask) >> (i << 1);
var fWrite = !!(bitsRW & 0x00010000);
if (fEnabled) {
this.addMemCheck(this.regDR[i], fWrite);
} else {
this.removeMemCheck(this.regDR[i], fWrite);
}
}
bitsEnabled <<= 2;
bitsRWMask <<= 2;
}
}
if (regDR != this.regDR[iDst]) {
this.checkDebugRegisters(false);
this.regDR[iDst] = regDR;
this.checkDebugRegisters(true);
}
this.regDR[iDst] = regDR;
this.nStepCycles -= (iDst < 4? 22 : 14);
/*
* TODO: Implement BACKTRACK for this instruction (although Debug registers are not likely to be a conduit for much interesting data).
* TODO: Implement BACKTRACK for this instruction (although Debug registers are not likely to be a conduit for interesting data).
*/
};
@ -550,7 +530,7 @@ X86.opMOVrt = function MOVrt()
*/
if (this.nCPL) {
/*
* You're not allowed to read control registers if the current privilege level is not zero
* You're not allowed to read control registers if the current privilege level is not zero.
*/
X86.fnFault.call(this, X86.EXCEPTION.GP_FAULT, 0);
return;
@ -567,7 +547,7 @@ X86.opMOVrt = function MOVrt()
this.nStepCycles -= 12;
/*
* TODO: Implement BACKTRACK for this instruction (although Test registers are not likely to be a conduit for much interesting data).
* TODO: Implement BACKTRACK for this instruction (although Test registers are not likely to be a conduit for interesting data).
*/
};
@ -588,7 +568,7 @@ X86.opMOVtr = function MOVtr()
*/
if (this.nCPL) {
/*
* You're not allowed to write control registers if the current privilege level is not zero
* You're not allowed to write control registers if the current privilege level is not zero.
*/
X86.fnFault.call(this, X86.EXCEPTION.GP_FAULT, 0);
return;
@ -610,7 +590,7 @@ X86.opMOVtr = function MOVtr()
this.nStepCycles -= 12;
/*
* TODO: Implement BACKTRACK for this instruction (although Test registers are not likely to be a conduit for much interesting data).
* TODO: Implement BACKTRACK for this instruction (although Test registers are not likely to be a conduit for interesting data).
*/
};