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Scaffolding for 32-bit ModRM decoding

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This commit is contained in:
Jeff Parsons 2015-01-20 22:13:40 -08:00 • committed by jeffpar
commit 7cdf097c8d
9 changed files with 22819 additions and 2522 deletions
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41
modules/pcjs/bin/x86gen.js
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@ -75,6 +75,9 @@ var w, sError = "";
var fGenMods = true;
var sEAFuncs = "";
var aBase = ["EAX", "ECX", "EDX", "EBX", "ESP", "EBP", "ESI", "EDI"];
var aIndex = ["EAX", "ECX", "EDX", "EBX", "none", "EBP", "ESI", "EDI"];
if (!fGenMods) {
var sOps = "", cOps = 0;
@ -256,11 +259,37 @@ else {
}
}
sContainer = "X86ModSIB" + ".aOpModSIB";
print(sContainer + " = [");
for (var sib = 0x00; sib <= 0xff && !sError; sib++) {
genSIB(sib);
}
print("];\n");
if (sEAFuncs) {
print("var X86Mods = {\n" + sEAFuncs + "};\n");
}
}
function genSIB(sib) {
var scale = (sib >> 6);
var index = (sib >> 3) & 0x7;
var base = (sib & 0x7);
var sFunc = "opModSIB" + toHex(sib, 2);
print(" /**");
print(" * " + sFunc + "(): scale=" + toBin(scale, 2) + " (" + toHex(1 << scale, 1) + ") index=" + toBin(index, 3) + " (" + aIndex[index] + ") base=" + toBin(base, 3) + " (" + (base == 5? "mod? EBP : disp32)" : aBase[base] + ")"));
print(" *");
print(" * @this {X86CPU}");
print(" * @param {number} mod");
print(" */");
print(" function " + sFunc + "(mod) {");
var sBase = (base == 5? "(mod? this.reg" + aBase[base] + " : this.getIPWord())" : "this.reg" + aBase[base]);
if (index != 4) sBase += " + (this.reg" + (aIndex[index] + " << " + scale) + ")";
print(" return " + sBase + ";");
print(" }" + (sib < 255? "," : ""));
}
function genMode(a, d, w, mrm, sGroup, sRO) {
var mod = (mrm >> 6);
var reg = (mrm >> 3) & 0x7;
@ -680,7 +709,7 @@ function genMode(a, d, w, mrm, sGroup, sRO) {
nCycles = "this.CYCLES.nEACyclesBase";
break;
case 4:
sModAddr = "this.getSIB()";
sModAddr = "this.getSIB(0)";
sModFunc = "SIB";
nCycles = "this.CYCLES.nEACyclesBase";
break;
@ -727,7 +756,7 @@ function genMode(a, d, w, mrm, sGroup, sRO) {
nCycles = "this.CYCLES.nEACyclesBaseDisp";
break;
case 4:
sModAddr = "this.getSIB() + this.getIPDisp()";
sModAddr = "this.getSIB(1) + this.getIPDisp()";
sModFunc = "SIBD8";
nCycles = "this.CYCLES.nEACyclesBaseDisp";
break;
@ -774,7 +803,7 @@ function genMode(a, d, w, mrm, sGroup, sRO) {
nCycles = "this.CYCLES.nEACyclesBaseDisp";
break;
case 4:
sModAddr = "this.getSIB() + this.getIPWord()";
sModAddr = "this.getSIB(2) + this.getIPWord()";
sModFunc = "SIBD32";
nCycles = "this.CYCLES.nEACyclesBaseDisp";
break;
@ -917,7 +946,7 @@ function genMode(a, d, w, mrm, sGroup, sRO) {
return null;
}
sOpMod = "opMod" + aOpPrefix[w] + aAddrPrefix[a] + (sGroup? sGroup + (sRO? sRO : "") : aDst[d]) + toHex(mrm, 2);
sOpMod = "opMod" + aAddrPrefix[a] + (sGroup? sGroup + (sRO? sRO : "") : aDst[d]) + aSize[w] + toHex(mrm, 2);
var sTemp = aSize[w].charAt(0).toLowerCase();
@ -926,7 +955,7 @@ function genMode(a, d, w, mrm, sGroup, sRO) {
* Use this to generate ModRM decoders that accept an array (ie, "group") of functions, and pass along an implied argument as well
*/
if (sRO && reg != 7) {
sOpMod = "opMod" + aSize[w] + aAddrPrefix[a] + (sGroup? sGroup : aDst[d]) + toHex(mrm, 2);
sOpMod = "opMod" + aAddrPrefix[a] + (sGroup? sGroup : aDst[d]) + aSize[w] + toHex(mrm, 2);
return sOpMod;
}
@ -1023,7 +1052,7 @@ function genMode(a, d, w, mrm, sGroup, sRO) {
if (mod == 3 && !d) {
var mrmPrime = (mod << 6) | (r_m << 3) | reg;
print(" X86Mod" + aOpPrefix[w] + aAddrPrefix[a] + ".aOpModReg[0x" + toHex(mrmPrime, 2) + "],");
sOpMod = "opMod" + aOpPrefix[w] + aAddrPrefix[a] + aDst[1] + toHex(mrmPrime, 2);
sOpMod = "opMod" + aAddrPrefix[a] + aDst[1] + aSize[w] + toHex(mrmPrime, 2);
return sOpMod;
}

7
modules/pcjs/lib/.jshintrc
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@ -20,6 +20,7 @@
"FATARRAYS": true,
"TYPEDARRAYS": true,
"SAMPLER": true,
"BACKTRACK": true,
"Component": true,
"State": true,
"Bus": true,
@ -43,7 +44,11 @@
"X86CPU": true,
"X86Grps": true,
"X86Help": true,
"X86Mods": true,
"X86ModB": true,
"X86ModW": true,
"X86ModB32": true,
"X86ModW32": true,
"X86ModSIB": true,
"X86OpXX": true,
"X86Op0F": true,
"str": true,

23
modules/pcjs/lib/x86cpu.js
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@ -46,6 +46,9 @@ if (typeof module !== 'undefined') {
var X86Help = require("./x86help");
var X86ModB = require("./x86modb");
var X86ModW = require("./x86modw");
var X86ModB32 = require("./x86modb32");
var X86ModW32 = require("./x86modw32");
var X86ModSIB = require("./x86modsib");
var X86OpXX = require("./x86opxx");
var X86Op0F = require("./x86op0f");
}
@ -2318,7 +2321,7 @@ X86CPU.prototype.getIPByte = function()
{
var b = (PREFETCH? this.getBytePrefetch(this.regLIP) : this.getByte(this.regLIP));
if (BACKTRACK) this.bus.updateBackTrackCode(this.regLIP, this.backTrack.btiMemLo);
this.regLIP = this.segCS.base + (this.regEIP = (this.regEIP + 1) & 0xffff); // this.advanceIP(1)
this.regLIP = this.segCS.base + (this.regEIP = (this.regEIP + 1) & 0xffff); // this.advanceIP(1)
return b;
};
@ -2332,7 +2335,7 @@ X86CPU.prototype.getIPDisp = function()
{
var b = ((PREFETCH? this.getBytePrefetch(this.regLIP) : this.getByte(this.regLIP)) << 24) >> 24;
if (BACKTRACK) this.bus.updateBackTrackCode(this.regLIP, this.backTrack.btiMemLo);
this.regLIP = this.segCS.base + (this.regEIP = (this.regEIP + 1) & 0xffff); // this.advanceIP(1)
this.regLIP = this.segCS.base + (this.regEIP = (this.regEIP + 1) & 0xffff); // this.advanceIP(1)
return b & 0xffff;
};
@ -2349,10 +2352,24 @@ X86CPU.prototype.getIPWord = function()
this.bus.updateBackTrackCode(this.regLIP, this.backTrack.btiMemLo);
this.bus.updateBackTrackCode(this.regLIP + 1, this.backTrack.btiMemHi);
}
this.regLIP = this.segCS.base + (this.regEIP = (this.regEIP + 2) & 0xffff); // this.advanceIP(2)
this.regLIP = this.segCS.base + (this.regEIP = (this.regEIP + 2) & 0xffff); // this.advanceIP(2)
return w;
};
/**
* getSIB(mod)
*
* @this {X86CPU}
* @param {number} mod
* @return {number}
*/
X86CPU.prototype.getSIB = function(mod)
{
var b = PREFETCH? this.getBytePrefetch(this.regLIP) : this.getByte(this.regLIP);
if (BACKTRACK) this.bus.updateBackTrackCode(this.regLIP, this.backTrack.btiMemLo);
return X86ModSIB.aOpModSIB[b].call(this, mod);
};
/**
* popWord()
*

2512
modules/pcjs/lib/x86modb.js
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8490
modules/pcjs/lib/x86modb32.js Normal file
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2348
modules/pcjs/lib/x86modsib.js Normal file
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2512
modules/pcjs/lib/x86modw.js
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9405
modules/pcjs/lib/x86modw32.js Normal file
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3
package.json
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@ -110,6 +110,9 @@
"./modules/pcjs/lib/x86help.js",
"./modules/pcjs/lib/x86modb.js",
"./modules/pcjs/lib/x86modw.js",
"./modules/pcjs/lib/x86modb32.js",
"./modules/pcjs/lib/x86modw32.js",
"./modules/pcjs/lib/x86modsib.js",
"./modules/pcjs/lib/x86opxx.js",
"./modules/pcjs/lib/x86op0f.js",
"./modules/pcjs/lib/chipset.js",