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More debugger paging improvements

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This commit is contained in:
Jeff Parsons 2015-05-08 12:58:53 -07:00 • committed by jeffpar
commit 83f2218e27
4 changed files with 24 additions and 15 deletions
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19
modules/pcjs/lib/x86cpu.js
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@ -737,9 +737,10 @@ X86CPU.prototype.enablePageBlocks = function()
* @this {X86CPU}
* @param {number} addr is a linear address
* @param {boolean} fWrite (true if called for a write, false if for a read)
* @param {boolean} [fSuppress] (true if any faults, remapping, etc should be suppressed)
* @return {Memory|null}
*/
X86CPU.prototype.mapPageBlock = function(addr, fWrite)
X86CPU.prototype.mapPageBlock = function(addr, fWrite, fSuppress)
{
var offPDE = (addr & X86.LADDR.PDE.MASK) >>> X86.LADDR.PDE.SHIFT;
var addrPDE = this.regCR3 + offPDE;
@ -752,12 +753,12 @@ X86CPU.prototype.mapPageBlock = function(addr, fWrite)
var pde = blockPDE.readLong(offPDE);
if (!(pde & X86.PTE.PRESENT)) {
X86.fnPageFault.call(this, addr, false, fWrite);
if (!fSuppress) X86.fnPageFault.call(this, addr, false, fWrite);
return null;
}
if (!(pde & X86.PTE.USER) && this.segCS.cpl == 3) {
X86.fnPageFault.call(this, addr, true, fWrite);
if (!fSuppress) X86.fnPageFault.call(this, addr, true, fWrite);
return null;
}
@ -771,13 +772,13 @@ X86CPU.prototype.mapPageBlock = function(addr, fWrite)
var blockPTE = this.aBusBlocks[(addrPTE & this.busMask) >>> this.blockShift];
var pte = blockPTE.readLong(offPTE);
if (!(pte & X86.PTE.PRESENT)) {
X86.fnPageFault.call(this, addr, false, fWrite);
if (!(pte & X86.PTE.PRESENT) && !fSuppress) {
if (!fSuppress) X86.fnPageFault.call(this, addr, false, fWrite);
return null;
}
if (!(pte & X86.PTE.USER) && this.segCS.cpl == 3) {
X86.fnPageFault.call(this, addr, true, fWrite);
if (!fSuppress) X86.fnPageFault.call(this, addr, true, fWrite);
return null;
}
@ -786,6 +787,7 @@ X86CPU.prototype.mapPageBlock = function(addr, fWrite)
* TODO: Since we're immediately shifting addrPhys by blockShift, we could also skip adding the addr's offset.
*/
var blockPhys = this.aBusBlocks[(addrPhys & this.busMask) >>> this.blockShift];
if (fSuppress) return blockPhys;
/*
* So we have the block containing the physical memory corresponding to the given linear address.
@ -2717,7 +2719,10 @@ X86CPU.prototype.setBinding = function(sHTMLType, sBinding, control)
X86CPU.prototype.probeAddr = function(addr)
{
var block = this.aMemBlocks[(addr & this.memMask) >>> this.blockShift];
if (block.type == Memory.TYPE.UNPAGED) return null;
if (block.type == Memory.TYPE.UNPAGED) {
block = this.mapPageBlock(addr, false, true);
if (!block) return null;
}
return block.readByteDirect(addr & this.blockLimit, addr);
};