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Halt (for now) on any 80386 GP fault, and prevent SPACE from scrolling the page

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This commit is contained in:
Jeff Parsons 2015-08-07 00:15:29 -07:00
commit c2d9d6b25f
3 changed files with 37 additions and 24 deletions
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14
modules/pcjs/lib/x86func.js
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@ -3831,14 +3831,14 @@ X86.fnFaultMessage = function(nFault, nError, fHalt)
/*
* There are a number of V86-mode exceptions we don't need to know about. For starters, Windows 3.00
* (and other versions of enhanced-mode Windows) use an ARPL in V86-mode to switch out of V86-mode, so
* we can ignore those UD_FAULTs.
* (and other versions of enhanced-mode Windows) use an ARPL to switch out of V86-mode, so we can ignore
* those UD_FAULTs.
*
* Ditto for software interrupts, which will generate a GP_FAULT when the interrupt number (eg, 0x6D)
* exceeds the protected-mode IDT's limit (eg, a limit of 0x2FF yields a maximum interrupt number of 0x5F).
* Windows doesn't really care if its IDT is too small, because no matter what, it has to simulate all
* software interrupts in V86-mode (they will also generate a GP_FAULT if IOPL < 3, and even if IOPL == 3,
* only the protected-mode IDT handler gets to run).
* exceeds the protected-mode IDT's limit (eg, a limit of 0x2FF corresponds to a maximum interrupt number
* of 0x5F). Windows doesn't really care if its IDT is too small, because it has to simulate all software
* interrupts in V86-mode regardless (they generate a GP_FAULT if IOPL < 3, and even when IOPL == 3, only
* the protected-mode IDT handler gets to run).
*/
if ((this.regPS & X86.PS.VM)) {
if (nFault == X86.EXCEPTION.UD_FAULT && bOpcode == X86.OPCODE.ARPL ||
@ -3846,7 +3846,7 @@ X86.fnFaultMessage = function(nFault, nError, fHalt)
fHalt = false;
}
} else {
if (MAXDEBUG && nFault == X86.EXCEPTION.NP_FAULT && bOpcode == 0x8E) {
if (nFault == X86.EXCEPTION.GP_FAULT && this.model == X86.MODEL_80386 /* || nFault == X86.EXCEPTION.NP_FAULT && bOpcode == 0x8E */) {
fHalt = true;
}
}