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A little more meat on the X86FPU bones

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This commit is contained in:
Jeff Parsons 2015-11-15 11:13:59 -08:00
commit a1556df5a5
14 changed files with 801 additions and 81 deletions
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38
modules/pcjs/lib/debugger.js
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@ -432,6 +432,8 @@ if (DEBUGGER) {
"FINCSTP","FDECSTP","FFREE", "FNOP", "FWAIT"
];
Debugger.FPU_TAGS = ["VALID", "ZERO", "SPECIAL", "EMPTY"];
Debugger.CPU_8086 = 0;
Debugger.CPU_80186 = 1;
Debugger.CPU_80286 = 2;
@ -1404,6 +1406,7 @@ if (DEBUGGER) {
this.cmp = cmp;
this.fdc = cmp.getMachineComponent("FDC");
this.hdc = cmp.getMachineComponent("HDC");
this.fpu = cmp.getMachineComponent("FPU");
this.mouse = cmp.getMachineComponent("Mouse");
if (MAXDEBUG) this.chipset = cmp.getMachineComponent("ChipSet");
@ -3962,7 +3965,7 @@ if (DEBUGGER) {
Debugger.prototype.powerDown = function(fSave, fShutdown)
{
if (fShutdown) this.println(fSave? "suspending" : "shutting down");
return fSave && this.save? this.save() : true;
return fSave? this.save() : true;
};
/**
@ -4904,14 +4907,15 @@ if (DEBUGGER) {
var r_m = (bModRM & 0x7);
/*
* Similar to how fnFPU() decodes FPU instructions, we combine mod and reg into one
* Similar to how opFPU() decodes FPU instructions, we combine mod and reg into one
* decodable value: put mod in the high nibble and reg in the low nibble, after first
* collapsing all mod values < 3 to zero.
*/
var modReg = (mod < 3? 0 : 0x30) + reg;
/*
* Use values >= 0x40 to indicate mod == 0x3, with reg in the high nibble and r_m in the low.
* All values >= 0x34 imply mod == 3 and reg >= 4, so now we shift reg into the high
* nibble and r_m into the low.
*/
if ((bOpcode == X86.OPCODE.ESC1 || bOpcode == X86.OPCODE.ESC3) && modReg >= 0x34) {
modReg = (reg << 4) | r_m;
@ -7021,6 +7025,7 @@ if (DEBUGGER) {
if (asArgs && asArgs[1] == '?') {
this.println("register commands:");
this.println("\tr\tdump registers");
if (this.fpu) this.println("\trfp\tdump floating-point registers");
this.println("\trp\tdump all registers");
this.println("\trx [#]\tset flag or register x to [#]");
return;
@ -7031,9 +7036,14 @@ if (DEBUGGER) {
if (asArgs != null && asArgs.length > 1) {
var sReg = asArgs[1];
if (this.fpu && sReg == "fp") {
this.doFPURegisters(asArgs);
return;
}
if (sReg == 'p') {
fProt = (this.cpu.model >= X86.MODEL_80286);
} else {
}
else {
// fInstruction = false;
var sValue = null;
var i = sReg.indexOf('=');
@ -7269,6 +7279,26 @@ if (DEBUGGER) {
}
};
/**
* doFPURegisters(asArgs)
*
* NOTE: If we're called, the existence of an FPU has already been verified.
*
* @this {Debugger}
* @param {Array.<string>} [asArgs]
*/
Debugger.prototype.doFPURegisters = function(asArgs)
{
this.assert(this.fpu);
for (var i = 0; i < 8; i++) {
var a = this.fpu.readFPUStack(i);
if (!a) break;
var sValue = str.pad(a[2].toFixed(15), 24, true);
this.println("ST" + i + ": " + sValue + " " + str.toHex(a[4]) + "," + str.toHex(a[3]) + " [" + Debugger.FPU_TAGS[a[1]] + "]");
// this.println(" REG" + a[0] + " " + str.toBin(a[7], 16) + str.toBin(a[6]) + str.toBin(a[5]));
}
};
/**
* doRun(sCmd, sAddr, sOptions, fQuiet)
*