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Improvements to code and stack limit checks (still not perfect, but better)

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This commit is contained in:
Jeff Parsons 2015-05-21 15:45:26 -07:00 • committed by jeffpar
commit cfd02bb4ae
4 changed files with 138 additions and 74 deletions
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11
modules/pcjs/lib/x86func.js
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@ -1197,8 +1197,9 @@ X86.fnINCw = function INCw(dst, src)
* only knows how to load GDT and LDT descriptors, whereas interrupts must use setCS.loadIDT(), which
* deals exclusively with IDT descriptors.
*
* This means we must take care to replicate critical features of setCSIP(); eg, setting segCS.fCall
* before calling loadIDT(), updating LIP, and flushing the prefetch queue.
* This means we must take care to replicate critical features of setCSIP(); ie, setting segCS.fCall
* BEFORE calling loadIDT(), and updating regLIP and regLIPLimit, resetting default operand and address sizes,
* and flushing the prefetch queue AFTER calling loadIDT().
*
* @this {X86CPU}
* @param {number} nIDT
@ -1217,13 +1218,15 @@ X86.fnINT = function INT(nIDT, nError, nCycles)
var oldIP = this.getIP();
var addr = this.segCS.loadIDT(nIDT);
if (addr !== X86.ADDR_INVALID) {
this.regLIP = addr;
if (PREFETCH) this.flushPrefetch(this.regLIP);
this.pushWord(oldPS);
this.pushWord(oldCS);
this.pushWord(oldIP);
if (nError != null) this.pushWord(nError);
this.nFault = -1;
this.regLIP = addr;
this.regLIPLimit = (this.segCS.base + this.segCS.limit)|0;
if (I386) this.resetSizes();
if (PREFETCH) this.flushPrefetch(this.regLIP);
}
};