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processor.js
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// 68000 cpu emulator code for EstyJs
// adapted from SAE - Scripted Amiga Emulator by Darren Coles
"use strict";
/**************************************************************************
* SAE - Scripted Amiga Emulator
*
* https://github.com/naTmeg/ScriptedAmigaEmulator
*
* ©2012 Rupert Hausberger
* Commercial use is prohibited.
*
***************************************************************************
*
* TODO:
* - Faster versions of ASx/LSx/ROx/ROXx and xBCD
*
* Notes:
* - Based on M68000PRM.pdf
* - Written from scratch.
*
**************************************************************************/
EstyJs.Processor = function (opts) {
var self = {};
var memory = opts.memory;
var mfp = opts.mfp;
var BUG = opts.bug;
var tot_cycles = 0;
var pendingInterrupts = new Uint8Array(8);
var ldeaTable = new Array(null, ldEA_T_RD, ldEA_T_RA, ldEA_T_AD, ldEA_T_IM);
var steaTable = new Array(null, stEA_T_RD, stEA_T_RA, stEA_T_AD);
var exeaTable = new Array(null, exEA_M_rdd, exEA_M_rda, exEA_M_ria, exEA_M_ripo, exEA_M_ripr, exEA_M_rid, exEA_M_rii, exEA_M_pcid, exEA_M_pcii, exEA_M_absw, exEA_M_absl, exEA_M_imm, null, null, null, null);
var frameRowCycles = 512;
var SPCFLAG_TRACE = false;
var SPCFLAG_DOTRACE = false;
var prefetch1 = 0;
var prefetch2 = 0;
var M_rdd = 1; /* Register Direct Data */
var M_rda = 2; /* Register Direct Address */
var M_ria = 3; /* Register Indirect Address */
var M_ripo = 4; /* Register Indirect Address with Postincrement */
var M_ripr = 5; /* Register Indirect Address with Predecrement */
var M_rid = 6; /* Register Indirect Address with Displacement */
var M_rii = 7; /* Address Register Indirect, with Index (8-Bit Displacement) */
var M_pcid = 8; /* Program Counter Indirect with Displacement */
var M_pcii = 9; /* Program Counter Indirect with Index (8-Bit Displacement) */
var M_absw = 10; /* Absolute Data Addressing */
var M_absl = 11; /* Absolute Data Addressing */
var M_imm = 12; /* Immediate Data */
var M_list = 16; /* Ax,Dx-list for easy MOVEM debug */
var T_RD = 1; /* Register Data */
var T_RA = 2; /* Register Address */
var T_AD = 3; /* Address */
var T_IM = 4; /* Immediate */
var SAEE_CPU_Internal = 1;
var ccNames = ['T', 'F', 'HI', 'LS', 'CC', 'CS', 'NE', 'EQ', 'VC', 'VS', 'PL', 'MI', 'GE', 'LT', 'GT', 'LE'];
/* Effective Address */
function effAddr(m, r) {
this.m = m; /* Mode M_ */
this.t = 0; /* Type T_ */
this.r = r; /* Register An/Dn */
this.a = 0; /* Address */
this.c = 0; /* Cycles */
}
/* Instruction Condition */
function iCon(cc, dp, dr) {
this.cc = cc; /* Condition Code */
this.dp = dp; /* Displacement */
this.dr = dr; /* Data Register for DBcc */
}
/* Instruction Paramenter */
function iPar() {
this.z; /* size B,W,L */
/* Filled on demand
this.s = new effAddr();
this.d = new effAddr();
this.c = new iCon();
this.ms = 0;
this.mz = 0;
this.cyc = 0;*/
}
/* Instruction Definition */
function iDef() {
this.op; /* OP-code */
this.pr; /* Privileged */
this.mn; /* Mnemonic */
this.f; /* Function */
this.p = new iPar();
}
/* Exception 2/3 error */
function Exception23(num) {
this.num = num;
}
Exception23.prototype = new Error;
function FatalError(err, msg) {
this.error = err;
this.message = msg;
}
FatalError.prototype = new Error;
function Fatal(err, msg) {
//alert(str);
throw new FatalError(err, msg);
}
/*-----------------------------------------------------------------------*/
var undef = false; /* use undef */
var regs = {
//d: [0, 0, 0, 0, 0, 0, 0, 0], /* Dn */
//a: [0, 0, 0, 0, 0, 0, 0, 0], /* An */
d: new Int32Array(8),
a: new Int32Array(8),
/* Status Register (SR) */
t: false,
s: false,
intmask: 0,
/* Condition Code Register (CCR) */
x: false,
n: false,
z: false,
v: false,
c: false,
usp: 0, /* User Stack Ptr (USP) */
isp: 0, /* Interrupt Stack Ptr (ISP) */
pc: 0, /* Program Counter (PC) */
stopped: true
};
var fault = {
op: 0,
pc: 0,
ad: 0,
ia: false
};
var iTab = null;
var cpu_cycles = 4;
/*-----------------------------------------------------------------------*/
function szChr(z) {
switch (z) {
case 0: return 'S';
case 1: return 'B';
case 2: return 'W';
case 4: return 'L';
default:
Fatal(SAEE_CPU_Internal, 'cpu.szChr() invalid size');
}
}
function regsStr(v, inv) {
var out = '';
for (var i = 0; i < 16; i++) {
if (v & (1 << (inv ? 15 - i : i))) {
if (i < 8) {
out += 'D' + i + ' ';
} else {
out += 'A' + (i - 8) + ' ';
}
}
}
return out;
}
function castByte(v) {
return (v & 0x80) ? (v - 0x100) : v;
}
function castWord(v) {
return (v & 0x8000) ? (v - 0x10000) : v;
}
function castUWord(v) {
return (v < 0) ? (0x10000 + v) : v;
}
function castLong(v) {
return (v & 0x80000000) ? (v - 0x100000000) : v;
}
function castULong(v) {
return (v < 0) ? (0x100000000 + v) : v;
}
function extByteToWord(v) {
return (v & 0x80) ? (0xff00 | v) : v;
}
function extByte(v) {
return (v & 0x80) ? ((0xffffff00 | v) >>> 0) : v;
}
function extWord(v) {
return (v & 0x8000) ? ((0xffff0000 | v) >>> 0) : v;
}
function add32(a, b) {
return (a + b) & 0xffffffff;
}
/*function addAuto(a, b, z) {
switch (z) {
case 1: return (a + b) & 0xff;;
case 2: return (a + b) & 0xffff;
case 4: return (a + b) & 0xffffffff;
default:
Fatal(SAEE_CPU_Internal, 'cpu.addAuto() invalid size');
}
}*/
function addAuto(a, b, z) {
var r = (a + b) & 0xffffffff;
switch (z) {
case 1: return r > 0xff ? r - 0x100 : r;
case 2: return r > 0xffff ? r - 0x10000 : r;
case 4: return r > 0xffffffff ? r - 0x100000000 : r;
default:
Fatal(SAEE_CPU_Internal, 'cpu.addAuto() invalid size');
}
}
function sub32(a, b) {
return (a - b) & 0xffffffff;
}
/* function subAuto(a, b, z) {
switch (z) {
case 1: return (a - b) & 0xff;
case 2: return (a - b) & 0xffff;
case 4: return (a - b) & 0xffffffff;
default:
Fatal(SAEE_CPU_Internal, 'cpu.subAuto() invalid size');
}
}*/
function subAuto(a, b, z) {
var r = (a - b) & 0xffffffff;
switch (z) {
case 1: return r < 0 ? r + 0x100 : r;
case 2: return r < 0 ? r + 0x10000 : r;
case 4: return r < 0 ? r + 0x100000000 : r;
default:
Fatal(SAEE_CPU_Internal, 'cpu.subAuto() invalid size');
}
}
function nextOPCode() {
var op = prefetch1;
prefetch1 = prefetch2;
fault.pc = regs.pc;
fault.op = op;
regs.pc += 2;
prefetch2 = memory.readWord(regs.pc + 2);
return op;
}
function nextIByte() {
var r = prefetch1 & 0xff;
prefetch1 = prefetch2;
regs.pc += 2;
prefetch2 = memory.readWord(regs.pc + 2);
return r;
}
function nextIWord() {
var r = prefetch1;
prefetch1 = prefetch2;
regs.pc += 2;
prefetch2 = memory.readWord(regs.pc + 2);
return r;
}
function nextILong() {
var r = memory.readLong(regs.pc);
regs.pc += 4;
prefetch1 = memory.readWord(regs.pc);
prefetch2 = memory.readWord(regs.pc + 2);
return r;
}
//var scale = 1 << ((ext & 0x600) >> 9); if (scale != 1) alert('exII() scale '+scale);
function exII(base) {
var ext = nextIWord();
if (ext & 0x100)
Fatal(SAEE_CPU_68020_Required, 'cpu.exII() Full extension index (not a 68000 program)');
else {
var disp = extByte(ext & 0xff);
var r = (ext & 0x7000) >> 12;
var reg = (ext & 0x8000) ? regs.a[r] : regs.d[r];
if (!(ext & 0x800)) reg = extWord(reg & 0xffff);
return add32(add32(base, disp), reg);
}
}
function exEA_M_rdd(ea, z) {
ea.a = ea.r;
ea.t = T_RD;
return ea;
}
function exEA_M_rda(ea, z) {
ea.a = ea.r;
ea.t = T_RA;
return ea;
}
function exEA_M_ria(ea, z) {
ea.a = regs.a[ea.r];
ea.t = T_AD;
return ea;
}
function exEA_M_ripo(ea, z) {
ea.a = regs.a[ea.r];
ea.t = T_AD;
regs.a[ea.r] += z;
return ea;
}
function exEA_M_ripr(ea, z) {
regs.a[ea.r] -= z;
/*if (regs.a[ea.r] < 0) {
BUG.say(sprintf('exEA() M_ripr A%d < 0 ($%x)', ea.r, regs.a[ea.r]));
regs.a[ea.r] += 0x100000000;
//AMIGA.cpu.diss(fault.pc, 1);
//AMIGA.cpu.dump();
//exception2(regs.a[ea.r], 0);
}*/
ea.a = regs.a[ea.r];
ea.t = T_AD;
return ea;
}
function exEA_M_rid(ea, z) {
var dp = (nextIWord());
ea.a = add32(regs.a[ea.r], extWord(dp));
ea.t = T_AD;
return ea;
}
function exEA_M_rii(ea, z) {
ea.a = exII(regs.a[ea.r]);
ea.t = T_AD;
return ea;
}
function exEA_M_pcid(ea, z) {
var dp = extWord(nextIWord());
ea.a = add32(regs.pc - 2, dp);
ea.t = T_AD;
return ea;
}
function exEA_M_pcii(ea, z) {
ea.a = exII(regs.pc);
ea.t = T_AD;
return ea;
}
function exEA_M_absw(ea, z) {
ea.a = extWord(nextIWord());
ea.t = T_AD;
return ea;
}
function exEA_M_absl(ea, z) {
ea.a = nextILong();
ea.t = T_AD;
return ea;
}
function exEA_M_imm(ea, z) {
if (ea.r == -1) {
switch (z) {
case 1: ea.a = nextIByte(); break;
case 2: ea.a = nextIWord(); break;
case 4: ea.a = nextILong(); break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.exEA() invalid size');
}
} else
ea.a = ea.r;
ea.t = T_IM;
return ea;
}
function exEA(ea, z) {
return exeaTable[ea.m](ea, z);
var dp;
switch (ea.m) {
case M_rdd:
ea.a = ea.r;
ea.t = T_RD;
break;
case M_rda:
ea.a = ea.r;
ea.t = T_RA;
break;
case M_ria:
ea.a = regs.a[ea.r];
ea.t = T_AD;
break;
case M_ripo:
ea.a = regs.a[ea.r];
ea.t = T_AD;
regs.a[ea.r] += z;
/*if (regs.a[ea.r] > 0xffffffff) {
BUG.say(sprintf('exEA() M_ripo A%d > 2^32 ($%x)', ea.r, regs.a[ea.r]));
regs.a[ea.r] -= 0x100000000;
//AMIGA.cpu.diss(fault.pc, 1);
//AMIGA.cpu.dump();
//exception2(regs.a[ea.r], 0);
}*/
break;
case M_ripr:
regs.a[ea.r] -= z;
/*if (regs.a[ea.r] < 0) {
BUG.say(sprintf('exEA() M_ripr A%d < 0 ($%x)', ea.r, regs.a[ea.r]));
regs.a[ea.r] += 0x100000000;
//AMIGA.cpu.diss(fault.pc, 1);
//AMIGA.cpu.dump();
//exception2(regs.a[ea.r], 0);
}*/
ea.a = regs.a[ea.r];
ea.t = T_AD;
break;
case M_rid:
dp = (nextIWord());
ea.a = add32(regs.a[ea.r], extWord(dp));
ea.t = T_AD;
break;
case M_rii:
ea.a = exII(regs.a[ea.r]);
ea.t = T_AD;
break;
case M_pcid:
dp = extWord(nextIWord());
ea.a = add32(regs.pc - 2, dp);
ea.t = T_AD;
break;
case M_pcii:
ea.a = exII(regs.pc);
ea.t = T_AD;
break;
case M_absw:
ea.a = extWord(nextIWord());
ea.t = T_AD;
break;
case M_absl:
ea.a = nextILong();
ea.t = T_AD;
break;
case M_imm:
{
if (ea.r == -1) {
switch (z) {
case 1: ea.a = nextIByte(); break;
case 2: ea.a = nextIWord(); break;
case 4: ea.a = nextILong(); break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.exEA() invalid size');
}
} else
ea.a = ea.r;
ea.t = T_IM;
break;
}
default:
Fatal(SAEE_CPU_Internal, 'cpu.exEA() invalid mode (' + ea.m + ')');
}
return ea;
}
function exEAM(ea) { /* MOVEM */
var dp;
switch (ea.m) {
case M_ria:
case M_ripo:
case M_ripr:
ea.a = regs.a[ea.r];
ea.t = T_AD;
break;
case M_rid:
dp = extWord(nextIWord());
ea.a = add32(regs.a[ea.r], dp);
ea.t = T_AD;
break;
case M_rii:
ea.a = exII(regs.a[ea.r]);
ea.t = T_AD;
break;
case M_pcid:
dp = extWord(nextIWord());
ea.a = add32(regs.pc - 2, dp);
ea.t = T_AD;
break;
case M_pcii:
ea.a = exII(regs.pc);
ea.t = T_AD;
break;
case M_absw:
ea.a = extWord(nextIWord());
ea.t = T_AD;
break;
case M_absl:
ea.a = nextILong();
ea.t = T_AD;
break;
case M_list: /* M_imm */
ea.a = nextIWord();
ea.t = T_IM;
break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.exEAM() invalid mode (' + ea.m + ')');
}
ea.c = 0;
return ea;
}
function ldEA_T_RD(ea, z) {
switch (z) {
case 1: return regs.d[ea.a] & 0xff;
case 2: return regs.d[ea.a] & 0xffff;
case 4: return regs.d[ea.a];
default:
Fatal(SAEE_CPU_Internal, 'cpu.ldEA() T_RD invalid size');
}
}
function ldEA_T_RA(ea, z) {
switch (z) {
case 1: return regs.a[ea.a] & 0xff;
case 2: return regs.a[ea.a] & 0xffff;
case 4: return regs.a[ea.a];
default:
Fatal(SAEE_CPU_Internal, 'cpu.ldEA() T_RA invalid size');
}
}
function ldEA_T_AD(ea, z) {
/* The USP must not be byte-aligned */
if (ea.m == M_ripo && ea.r == 7 && z == 1) {
//BUG.say(sprintf('ldEA() USP ADDRESS ERROR A7 $%08x', regs.a[7]));
regs.a[7]++;
return memory.readWord(regs.a[7] - 2) >>> 8;
}
if (ea.a > 0xffffff) { //&& ea.m != M_absl) {
//BUG.say(sprintf('ldEA() BUS ERROR, $%08x > 24bit, reducing address to $%08x', ea.a, ea.a & 0xffffff));
ea.a &= 0xffffff;
}
if ((ea.a & 1) && z != 1) {
//BUG.say(sprintf('ldEA() ADDRESS ERROR $%08x, pc $%08x', ea.a, fault.pc));
//AMIGA.cpu.diss(fault.pc-8, 20);
//AMIGA.cpu.dump();
exception3(ea.a, 1);
}
switch (z) {
case 1: return memory.readByte(ea.a);
case 2: return memory.readWord(ea.a);
case 4: return memory.readLong(ea.a);
default:
Fatal(SAEE_CPU_Internal, 'cpu.ldEA() T_AD invalid size');
}
}
function ldEA_T_IM(ea, z) {
return ea.a;
}
function ldEA(ea, z) {
return ldeaTable[ea.t](ea, z);
switch (ea.t) {
case T_RD:
{
switch (z) {
case 1: return regs.d[ea.a] & 0xff;
case 2: return regs.d[ea.a] & 0xffff;
case 4: return regs.d[ea.a];
default:
Fatal(SAEE_CPU_Internal, 'cpu.ldEA() T_RD invalid size');
}
}
case T_RA:
{
switch (z) {
case 2: return regs.a[ea.a] & 0xffff;
case 4: return regs.a[ea.a];
default:
Fatal(SAEE_CPU_Internal, 'cpu.ldEA() T_RA invalid size');
}
}
case T_AD:
{
/* The USP must not be byte-aligned */
if (ea.m == M_ripo && ea.r == 7 && z == 1) {
//BUG.say(sprintf('ldEA() USP ADDRESS ERROR A7 $%08x', regs.a[7]));
regs.a[7]++;
return memory.readWord(regs.a[7] - 2) >>> 8;
}
if (ea.a > 0xffffff) { //&& ea.m != M_absl) {
//BUG.say(sprintf('ldEA() BUSERROR, $%08x > 24bit, reducing address to $%08x', ea.a, ea.a & 0xffffff));
ea.a &= 0xffffff;
}
if ((ea.a & 1) && z != 1) {
//BUG.say(sprintf('ldEA() ADDRESS ERROR $%08x, pc $%08x', ea.a, fault.pc));
//AMIGA.cpu.diss(fault.pc-8, 20);
//AMIGA.cpu.dump();
exception3(ea.a, 1);
}
switch (z) {
case 1: return memory.readByte(ea.a);
case 2: return memory.readWord(ea.a);
case 4: return memory.readLong(ea.a);
default:
Fatal(SAEE_CPU_Internal, 'cpu.ldEA() T_AD invalid size');
}
}
case T_IM:
return ea.a;
default:
Fatal(SAEE_CPU_Internal, 'cpu.ldEA() invalid type (' + ea.t + ')');
}
}
function stEA_T_RD(ea, z, v) {
switch (z) {
case 1: regs.d[ea.a] = ((regs.d[ea.a] & 0xffffff00) | v) >>> 0; break;
case 2: regs.d[ea.a] = ((regs.d[ea.a] & 0xffff0000) | v) >>> 0; break;
case 4: regs.d[ea.a] = v; break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.stEA() invalid size');
}
}
function stEA_T_RA(ea, z, v) {
regs.a[ea.a] = v;
}
function stEA_T_AD(ea, z, v) {
/* The USP must not be byte-aligned */
if (ea.m == M_ripr && ea.r == 7 && z == 1) {
//BUG.say(sprintf('stEA() USP ADDRESS ERROR A7 $%08x', regs.a[7]));
memory.writeWord(--regs.a[7], v << 8);
return;
}
if (ea.a > 0xffffff) { //&& ea.m != M_absl) {
//BUG.say(sprintf('stEA() BUS ERROR, $%08x > 24bit, reducing address to $%08x', ea.a, ea.a & 0xffffff));
ea.a &= 0xffffff;
}
if ((ea.a & 1) && z != 1) {
//BUG.say(sprintf('stEA() ADDRESS ERROR $%08x, pc $%08x', ea.a, fault.pc));
//AMIGA.cpu.diss(fault.pc-8, 20);
//AMIGA.cpu.dump();
exception3(ea.a, 1);
}
switch (z) {
case 1: memory.writeByte(ea.a, v); break;
case 2: memory.writeWord(ea.a, v); break;
case 4: memory.writeLong(ea.a, v); break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.stEA() invalid size');
}
}
function stEA(ea, z, v) {
steaTable[ea.t](ea, z, v);
return;
switch (ea.t) {
case T_RD:
switch (z) {
case 1: regs.d[ea.a] = ((regs.d[ea.a] & 0xffffff00) | v) >>> 0; break;
case 2: regs.d[ea.a] = ((regs.d[ea.a] & 0xffff0000) | v) >>> 0; break;
case 4: regs.d[ea.a] = v; break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.stEA() invalid size');
}
break;
case T_RA:
regs.a[ea.a] = v;
break;
case T_AD:
{
/* The USP must not be byte-aligned */
if (ea.m == M_ripr && ea.r == 7 && z == 1) {
//BUG.say(sprintf('stEA() USP ADDRESS ERROR A7 $%08x', regs.a[7]));
memory.writeWord(--regs.a[7], v << 8);
return;
}
if (ea.a > 0xffffff) { //&& ea.m != M_absl) {
//BUG.say(sprintf('stEA() BUS ERROR, $%08x > 24bit, reducing address to $%08x', ea.a, ea.a & 0xffffff));
ea.a &= 0xffffff;
}
if ((ea.a & 1) && z != 1) {
//BUG.say(sprintf('stEA() ADDRESS ERROR $%08x, pc $%08x', ea.a, fault.pc));
//AMIGA.cpu.diss(fault.pc-8, 20);
//AMIGA.cpu.dump();
exception3(ea.a, 1);
}
switch (z) {
case 1: memory.writeByte(ea.a, v); break;
case 2: memory.writeWord(ea.a, v); break;
case 4: memory.writeLong(ea.a, v); break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.stEA() invalid size');
}
break;
}
default:
Fatal(SAEE_CPU_Internal, 'cpu.stEA() invalid type (' + ea.t + ')');
}
}
function ccTrue(cc) {
switch (cc) {
case 0: return true; //T
case 1: return false; //F
case 2: return !regs.c && !regs.z; //HI
case 3: return regs.c || regs.z; //LS
case 4: return !regs.c; //CC
case 5: return regs.c; //CS
case 6: return !regs.z; //NE
case 7: return regs.z; //EQ
case 8: return !regs.v; //VC
case 9: return regs.v; //VV
case 10: return !regs.n; //PL
case 11: return regs.n; //MI
case 12: return regs.n == regs.v; //GE
case 13: return regs.n != regs.v; //LT
case 14: return !regs.z && (regs.n == regs.v); //GT
case 15: return regs.z || (regs.n != regs.v); //LE
default:
Fatal(SAEE_CPU_Internal, 'cpu.ccTrue() invalid condition code (' + cc + ')');
}
}
/*switch (z) {
case 1: if (S > 0xff || D > 0xff || R > 0xff) alert('fadd 8'); break;
case 2: if (S > 0xffff || D > 0xffff || R > 0xffff) alert('fadd 16'); break;
}*/
function flgAdd(S, D, R, z, isADDX) /* ADD, ADDI, ADDQ, ADDX */
{
var Sm, Dm, Rm;
switch (z) {
case 1:
Sm = (S & 0x80) != 0;
Dm = (D & 0x80) != 0;
Rm = (R & 0x80) != 0;
break;
case 2:
Sm = (S & 0x8000) != 0;
Dm = (D & 0x8000) != 0;
Rm = (R & 0x8000) != 0;
break;
case 4:
Sm = (S & 0x80000000) != 0;
Dm = (D & 0x80000000) != 0;
Rm = (R & 0x80000000) != 0;
break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.flgAdd() invalid size');
}
regs.v = (Sm && Dm && !Rm) || (!Sm && !Dm && Rm);
regs.c = (Sm && Dm) || (!Rm && Dm) || (Sm && !Rm);
regs.x = regs.c;
regs.n = Rm;
if (isADDX) {
if (R != 0)
regs.z = false;
} else
regs.z = R == 0;
}
/*switch (z) {
case 1: if (S > 0xff || D > 0xff || R > 0xff) alert('fsub 8'); break;
case 2: if (S > 0xffff || D > 0xffff || R > 0xffff) alert('fsub 16'); break;
}*/
function flgSub(S, D, R, z, isSUBX) /* SUB, SUBI, SUBQ, SUBX */
{
var Sm, Dm, Rm;
switch (z) {
case 1:
Sm = (S & 0x80) != 0;
Dm = (D & 0x80) != 0;
Rm = (R & 0x80) != 0;
break;
case 2:
Sm = (S & 0x8000) != 0;
Dm = (D & 0x8000) != 0;
Rm = (R & 0x8000) != 0;
break;
case 4:
Sm = (S & 0x80000000) != 0;
Dm = (D & 0x80000000) != 0;
Rm = (R & 0x80000000) != 0;
break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.flgSub() invalid size');
}
regs.v = (!Sm && Dm && !Rm) || (Sm && !Dm && Rm);
regs.c = (Sm && !Dm) || (Rm && !Dm) || (Sm && Rm);
regs.x = regs.c;
regs.n = Rm;
if (isSUBX) {
if (R != 0)
regs.z = false;
} else
regs.z = R == 0;
}
/*switch (z) {
case 1: if (S > 0xff || D > 0xff || R > 0xff) alert('fcmp 8'); break;
case 2: if (S > 0xffff || D > 0xffff || R > 0xffff) alert('fcmp 16'); break;
}*/
function flgCmp(S, D, R, z) /* CMP, CMPA, CMPI, CMPM */
{
var Sm, Dm, Rm;
switch (z) {
case 1:
Sm = (S & 0x80) != 0;
Dm = (D & 0x80) != 0;
Rm = (R & 0x80) != 0;
break;
case 2:
Sm = (S & 0x8000) != 0;
Dm = (D & 0x8000) != 0;
Rm = (R & 0x8000) != 0;
break;
case 4:
Sm = (S & 0x80000000) != 0;
Dm = (D & 0x80000000) != 0;
Rm = (R & 0x80000000) != 0;
break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.flgCmp() invalid size');
}
regs.v = (!Sm && Dm && !Rm) || (Sm && !Dm && Rm);
regs.c = (Sm && !Dm) || (Rm && !Dm) || (Sm && Rm);
regs.n = Rm;
regs.z = R == 0;
}
/*switch (z) {
case 1: if (D > 0xff || R > 0xff) alert('fneg 8'); break;
case 2: if (D > 0xffff || R > 0xffff) alert('fneg 16'); break;
}*/
function flgNeg(D, R, z, isNEGX) /* NEG, NEGX */
{
var Dm, Rm;
switch (z) {
case 1:
Dm = (D & 0x80) != 0;
Rm = (R & 0x80) != 0;
break;
case 2:
Dm = (D & 0x8000) != 0;
Rm = (R & 0x8000) != 0;
break;
case 4:
Dm = (D & 0x80000000) != 0;
Rm = (R & 0x80000000) != 0;
break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.flgNeg() invalid size');
}
regs.v = Dm && Rm;
regs.c = Dm || Rm;
regs.x = regs.c;
regs.n = Rm;
if (isNEGX) {
if (R != 0)
regs.z = false;
} else
regs.z = R == 0;
}
/*switch (z) {
case 1: if (R > 0xff) alert('flog 8'); break;
case 2: if (R > 0xffff) alert('flog 16'); break;
}*/
function flgLogical(R, z) { /* AND ANDI OR ORI EOR EORI MOVE MOVEQ EXT NOT TST */
switch (z) {
case 1:
regs.n = (R & 0x80) != 0;
break;
case 2:
regs.n = (R & 0x8000) != 0;
break;
case 4:
regs.n = (R & 0x80000000) != 0;
break;
default:
Fatal(SAEE_CPU_Internal, 'cpu.flgLogical() invalid size');
}
regs.z = R == 0;
regs.v = regs.c = false;
}
/*-----------------------------------------------------------------------*/
/*-----------------------------------------------------------------------*/
/*-----------------------------------------------------------------------*/
/* Data Movement */
function I_EXG(p) {
var sea = exeaTable[p.s.m](p.s, p.z);
var s = ldeaTable[sea.t](sea, p.z);
var dea = exeaTable[p.d.m](p.d, p.z);
var d = ldeaTable[dea.t](dea, p.z);
steaTable[sea.t](sea, p.z, d);
steaTable[dea.t](dea, p.z, s);
//ccna
//BUG.say(sprintf('I_EXG.%s s $%08x <-> d $%08x', szChr(p.z), s, d));
return p.cyc; //6;
}
function I_LEA(p) {
var sea = exeaTable[p.s.m](p.s, p.z);
var dea = exeaTable[p.d.m](p.d, p.z);
steaTable[dea.t](dea, p.z, sea.a);
//ccna
//BUG.say(sprintf('I_LEA.%s sea $%08x', szChr(p.z), sea.a));
return p.cyc;
}
function I_PEA(p) {
var sea = exeaTable[p.s.m](p.s, p.z);
var dea = exEA(new effAddr(M_ripr, 7), p.z);
steaTable[dea.t](dea, p.z, sea.a);
//ccna
return p.cyc;
}
function I_LINK(p) {
var sea = exeaTable[p.s.m](p.s, p.z);
var An = sea.a;
var dea = exeaTable[p.d.m](p.d, p.z);
var dp = ldeaTable[dea.t](dea, p.z); if (p.z == 2) dp = extWord(dp);
stEA(exEA(new effAddr(M_ripr, 7), 4), 4, regs.a[An]);
regs.a[An] = regs.a[7];
regs.a[7] = add32(regs.a[7], dp);
//ccna
return p.cyc;
/*debug
var newsp = add32(regs.a[7], dp);
BUG.say(sprintf('I_LINK.%s A%d, dp $%08x, oldsp $%08x, newsp $%08x', szChr(p.z), An, dp, regs.a[7], newsp));
regs.a[7] = newsp;*/
}
function I_UNLK(p) {
var sea = exeaTable[p.s.m](p.s, p.z);
var An = sea.a;
regs.a[7] = regs.a[An];
regs.a[An] = ldEA(exEA(new effAddr(M_ripo, 7), 4), 4);
//ccna
//BUG.say(sprintf('I_UNLK.%s A%d', szChr(p.z), An));
return p.cyc;
}
function I_MOVE(p) {
var sea = exeaTable[p.s.m](p.s, p.z);
var s = ldeaTable[sea.t](sea, p.z);
var dea = exeaTable[p.d.m](p.d, p.z);
steaTable[dea.t](dea, p.z, s);
flgLogical(s, p.z);
//BUG.say(sprintf('I_MOVE.%s sm %d dm %d sa $%08x da $%08x r $%08x', szChr(p.z), p.s.m, p.d.m, sea.a, dea.a, s));
return p.cyc;
}