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Fixed WDEB386 fielding of V86-mode exceptions

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This commit is contained in:
Jeff Parsons 2015-10-20 19:23:45 -07:00
commit 7babb15868
3 changed files with 34 additions and 10 deletions
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24
modules/pcjs/lib/x86func.js
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@ -1506,19 +1506,23 @@ X86.fnIRET = function()
}
else {
if (newPS & X86.PS.VM) {
this.assert(!!(this.regCR0 & X86.CR0.MSW.PE));
/*
* As noted in loadDesc8(), where the V86-mode frame we're about to pop was originally pushed,
* these frames ALWAYS contain 32-bit values, so make sure that sizeData reflects that.
*/
this.assert(!!(this.regCR0 & X86.CR0.MSW.PE) && this.sizeData == 4);
/*
* We have to assume that a full V86-mode interrupt frame was on the protected-mode stack; namely:
*
* GS
* FS
* DS
* ES
* SS
* ESP
* EFLAGS
* CS
* EIP
* low: EIP
* CS (padded to 32 bits)
* EFLAGS
* ESP
* SS (padded to 32 bits)
* ES (padded to 32 bits)
* DS (padded to 32 bits)
* FS (padded to 32 bits)
* high: GS (padded to 32 bits)
*
* We've already popped EIP, CS, and EFLAGS into newIP, newCS and newPS, respectively, so we must now
* pop the rest, while we're still in protected-mode, before the switch to V86-mode alters the current