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When halting on faults in the Debugger, interrupt the instruction in the same manner as the actual fault would

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This commit is contained in:
Jeff Parsons 2016-01-27 13:04:52 -08:00
commit 763b02794b
2 changed files with 53 additions and 65 deletions
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20
modules/pcjs/lib/x86func.js
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@ -360,7 +360,6 @@ X86.fnBTMem = function(dst, src)
if (this.regEA === X86.ADDR_INVALID) {
return X86.fnBT.call(this, dst, src);
}
/*
* TODO: Consider a worker function that performs the following block of code for: BT, BTC, BTR, and BTS.
* It's somewhat inconvenient, because it needs to provide two results: an updated src AND an updated dst.
@ -409,7 +408,6 @@ X86.fnBTCMem = function(dst, src)
if (this.regEA === X86.ADDR_INVALID) {
return X86.fnBTC.call(this, dst, src);
}
/*
* src is usually positive BUT can also be negative (as the IA32 spec says: "The offset operand then selects
* a bit position within the range −231 to 231 − 1 for a register offset and 0 to 31 for an immediate offset.")
@ -451,7 +449,6 @@ X86.fnBTRMem = function(dst, src)
if (this.regEA === X86.ADDR_INVALID) {
return X86.fnBTR.call(this, dst, src);
}
/*
* src is usually positive BUT can also be negative (as the IA32 spec says: "The offset operand then selects
* a bit position within the range −231 to 231 − 1 for a register offset and 0 to 31 for an immediate offset.")
@ -493,7 +490,6 @@ X86.fnBTSMem = function(dst, src)
if (this.regEA === X86.ADDR_INVALID) {
return X86.fnBTS.call(this, dst, src);
}
/*
* src is usually positive BUT can also be negative (as the IA32 spec says: "The offset operand then selects
* a bit position within the range −231 to 231 − 1 for a register offset and 0 to 31 for an immediate offset.")
@ -3939,7 +3935,7 @@ X86.fnTrap = function(nIDT, nCycles)
*/
X86.fnFault = function(nFault, nError, nCycles, fHalt)
{
var fDispatch = null;
var fDispatch = false;
if (!this.aFlags.fComplete) {
/*
@ -3950,6 +3946,9 @@ X86.fnFault = function(nFault, nError, nCycles, fHalt)
this.setIP(this.opLIP - this.segCS.base);
}
else if (this.model >= X86.MODEL_80186) {
fDispatch = true;
if (this.nFault < 0) {
/*
* Single-fault (error code is passed through, and the responsible instruction is restartable;
@ -3966,14 +3965,12 @@ X86.fnFault = function(nFault, nError, nCycles, fHalt)
this.setSP((this.regESP & ~this.segSS.maskAddr) | (this.opLSP - this.segSS.base));
this.opLSP = X86.ADDR_INVALID;
}
fDispatch = true;
}
else if (this.nFault != X86.EXCEPTION.DF_FAULT) {
/*
* Double-fault (error code is always zero, and the responsible instruction is not restartable)
*/
nError = 0; nFault = X86.EXCEPTION.DF_FAULT;
fDispatch = true;
}
else {
/*
@ -3982,12 +3979,17 @@ X86.fnFault = function(nFault, nError, nCycles, fHalt)
*/
nFault = -1; nError = 0;
this.resetRegs();
fHalt = false;
fDispatch = fHalt = false;
}
}
if (X86.fnFaultMessage.call(this, nFault, nError, fHalt)) {
fDispatch = false;
/*
* If this is a fault that would normally be dispatched BUT fnFaultMessage() wants us to halt,
* then we throw a bogus fault number (-1), simply to interrupt the current instruction in exactly
* the same way that a dispatched fault would interrupt it.
*/
if (fDispatch) throw -1;
}
if (fDispatch) {