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Started work on new decoding functions

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Jeff 2016-09-22 18:47:32 -07:00 • committed by Jeff Parsons
commit 7f0b6a091d
8 changed files with 852 additions and 732 deletions
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179
modules/pdp11/lib/cpuops.js
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@ -40,85 +40,116 @@ if (NODE) {
}
/**
* op=0x00 (NOP)
* fnBIC(dst, src)
*
* @this {CPUStatePDP11}
* @param {number} src
* @param {number} dst
* @return {number} (~src & dst)
*/
PDP11.opNOP = function()
PDP11.fnBIC = function(src, dst)
{
this.nStepCycles -= 4;
return ~src & dst;
};
/*
* This 256-entry array of opcode functions is at the heart of the CPU engine: stepCPU(n).
/**
* op1170(opCode)
*
* It might be worth trying a switch() statement instead, to see how the performance compares,
* but I suspect that would vary quite a bit across JavaScript engines; for now, I'm putting my
* money on array lookup.
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.aOpsPDP1170 = [
/* 0x00-0x03 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x04-0x07 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x08-0x0B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x0C-0x0F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x10-0x13 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x14-0x17 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x18-0x1B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x1C-0x1F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x20-0x23 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x24-0x27 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x28-0x2B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x2C-0x2F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x30-0x33 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x34-0x37 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x38-0x3B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x3C-0x3F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x40-0x43 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x44-0x47 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x48-0x4B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x4C-0x4F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x50-0x53 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x54-0x57 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x58-0x5B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x5C-0x5F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x60-0x63 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x64-0x67 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x68-0x6B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x6C-0x6F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x70-0x73 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x74-0x77 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x78-0x7B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x7C-0x7F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x80-0x83 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x84-0x87 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x88-0x8B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x8C-0x8F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x90-0x93 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x94-0x97 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x98-0x9B */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0x9C-0x9F */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xA0-0xA3 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xA4-0xA7 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xA8-0xAB */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xAC-0xAF */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xB0-0xB3 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xB4-0xB7 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xB8-0xBB */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xBC-0xBF */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xC0-0xC3 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xC4-0xC7 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xC8-0xCB */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xCC-0xCF */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xD0-0xD3 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xD4-0xD7 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xD8-0xDB */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xDC-0xDF */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xE0-0xE3 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xE4-0xE7 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xE8-0xEB */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xEC-0xEF */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xF0-0xF3 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xF4-0xF7 */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xF8-0xFB */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP,
/* 0xFC-0xFF */ PDP11.opNOP, PDP11.opNOP, PDP11.opNOP, PDP11.opNOP
PDP11.op1170 = function(opCode)
{
PDP11.aOpsF000_1170[opCode >> 12].call(this, opCode);
};
/**
* op0XXX_1170(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.op0XXX_1170 = function(opCode)
{
// PDP11.aOpsF000_1170[opCode >> 12].call(this, opCode);
};
/**
* opMOV(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.opMOV = function(opCode)
{
this.updateNZFlags(this.writeWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT)));
this.nStepCycles -= 1;
};
/**
* opCMP(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.opCMP = function(opCode)
{
var src = this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT);
var dst = this.readWordByMode(opCode);
var result = src - dst;
this.updateAllFlags(result, src, dst);
this.nStepCycles -= 1;
};
/**
* opBIT(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.opBIT = function(opCode)
{
this.updateNZFlags(this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT) & this.readWordByMode(opCode));
this.nStepCycles -= 1;
};
/**
* opBIC(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.opBIC = function(opCode)
{
this.updateNZFlags(this.updateWordByMode(opCode, this.readWordByMode(opCode >> PDP11.SRCMODE.SHIFT), PDP11.fnBIC));
this.nStepCycles -= 1;
};
/**
* opNOP(opCode)
*
* @this {CPUStatePDP11}
* @param {number} opCode
*/
PDP11.opNOP = function(opCode)
{
this.nStepCycles -= 1;
};
PDP11.aOpsF000_1170 = [
PDP11.op0XXX_1170,
PDP11.opMOV, // MOV 01SSDD
PDP11.opCMP, // CMP 02SSDD
PDP11.opBIT, // BIT 03SSDD
PDP11.opBIC, // BIC 04SSDD
PDP11.opNOP, // 0x5XXX
PDP11.opNOP, // 0x6XXX
PDP11.opNOP, // 0x7XXX
PDP11.opNOP, // 0x8XXX
PDP11.opNOP, // 0x9XXX
PDP11.opNOP, // 0xAXXX
PDP11.opNOP, // 0xBXXX
PDP11.opNOP, // 0xCXXX
PDP11.opNOP, // 0xDXXX
PDP11.opNOP, // 0xEXXX
PDP11.opNOP // 0xFXXX
];