778 lines
12 KiB
C
778 lines
12 KiB
C
/*
|
|
* fetch.c
|
|
*
|
|
* This file is part of Emu48
|
|
*
|
|
* Copyright (C) 1999 Christoph Gießelink
|
|
*
|
|
*/
|
|
#include "pch.h"
|
|
#include "Opcodes.h"
|
|
|
|
#define F 0xFF // F = function
|
|
|
|
typedef struct
|
|
{
|
|
const VOID *pLnk;
|
|
const DWORD dwTyp;
|
|
} JMPTAB;
|
|
|
|
// jump tables
|
|
static const JMPTAB oF_[] =
|
|
{
|
|
oF0, F,
|
|
oF1, F,
|
|
oF2, F,
|
|
oF3, F,
|
|
oF4, F,
|
|
oF5, F,
|
|
oF6, F,
|
|
oF7, F,
|
|
oF8, F,
|
|
oF9, F,
|
|
oFA, F,
|
|
oFB, F,
|
|
oFC, F,
|
|
oFD, F,
|
|
oFE, F,
|
|
oFF, F
|
|
};
|
|
|
|
static const JMPTAB oE_[] =
|
|
{
|
|
oE0, F,
|
|
oE1, F,
|
|
oE2, F,
|
|
oE3, F,
|
|
oE4, F,
|
|
oE5, F,
|
|
oE6, F,
|
|
oE7, F,
|
|
oE8, F,
|
|
oE9, F,
|
|
oEA, F,
|
|
oEB, F,
|
|
oEC, F,
|
|
oED, F,
|
|
oEE, F,
|
|
oEF, F
|
|
};
|
|
|
|
static const JMPTAB oD_[] =
|
|
{
|
|
oD0, F,
|
|
oD1, F,
|
|
oD2, F,
|
|
oD3, F,
|
|
oD4, F,
|
|
oD5, F,
|
|
oD6, F,
|
|
oD7, F,
|
|
oD8, F,
|
|
oD9, F,
|
|
oDA, F,
|
|
oDB, F,
|
|
oDC, F,
|
|
oDD, F,
|
|
oDE, F,
|
|
oDF, F
|
|
};
|
|
|
|
static const JMPTAB oC_[] =
|
|
{
|
|
oC0, F,
|
|
oC1, F,
|
|
oC2, F,
|
|
oC3, F,
|
|
oC4, F,
|
|
oC5, F,
|
|
oC6, F,
|
|
oC7, F,
|
|
oC8, F,
|
|
oC9, F,
|
|
oCA, F,
|
|
oCB, F,
|
|
oCC, F,
|
|
oCD, F,
|
|
oCE, F,
|
|
oCF, F
|
|
};
|
|
|
|
static const JMPTAB oBb_[] =
|
|
{
|
|
oBb0, F,
|
|
oBb1, F,
|
|
oBb2, F,
|
|
oBb3, F,
|
|
oBb4, F,
|
|
oBb5, F,
|
|
oBb6, F,
|
|
oBb7, F,
|
|
oBb8, F,
|
|
oBb9, F,
|
|
oBbA, F,
|
|
oBbB, F,
|
|
oBbC, F,
|
|
oBbD, F,
|
|
oBbE, F,
|
|
oBbF, F
|
|
};
|
|
|
|
static const JMPTAB oBa_[] =
|
|
{
|
|
oBa0, F,
|
|
oBa1, F,
|
|
oBa2, F,
|
|
oBa3, F,
|
|
oBa4, F,
|
|
oBa5, F,
|
|
oBa6, F,
|
|
oBa7, F,
|
|
oBa8, F,
|
|
oBa9, F,
|
|
oBaA, F,
|
|
oBaB, F,
|
|
oBaC, F,
|
|
oBaD, F,
|
|
oBaE, F,
|
|
oBaF, F
|
|
};
|
|
|
|
static const JMPTAB oB_[] =
|
|
{
|
|
oBa_, 2,
|
|
oBa_, 2,
|
|
oBa_, 2,
|
|
oBa_, 2,
|
|
oBa_, 2,
|
|
oBa_, 2,
|
|
oBa_, 2,
|
|
oBa_, 2,
|
|
oBb_, 2,
|
|
oBb_, 2,
|
|
oBb_, 2,
|
|
oBb_, 2,
|
|
oBb_, 2,
|
|
oBb_, 2,
|
|
oBb_, 2,
|
|
oBb_, 2
|
|
};
|
|
|
|
static const JMPTAB oAb_[] =
|
|
{
|
|
oAb0, F,
|
|
oAb1, F,
|
|
oAb2, F,
|
|
oAb3, F,
|
|
oAb4, F,
|
|
oAb5, F,
|
|
oAb6, F,
|
|
oAb7, F,
|
|
oAb8, F,
|
|
oAb9, F,
|
|
oAbA, F,
|
|
oAbB, F,
|
|
oAbC, F,
|
|
oAbD, F,
|
|
oAbE, F,
|
|
oAbF, F
|
|
};
|
|
|
|
static const JMPTAB oAa_[] =
|
|
{
|
|
oAa0, F,
|
|
oAa1, F,
|
|
oAa2, F,
|
|
oAa3, F,
|
|
oAa4, F,
|
|
oAa5, F,
|
|
oAa6, F,
|
|
oAa7, F,
|
|
oAa8, F,
|
|
oAa9, F,
|
|
oAaA, F,
|
|
oAaB, F,
|
|
oAaC, F,
|
|
oAaD, F,
|
|
oAaE, F,
|
|
oAaF, F
|
|
};
|
|
|
|
static const JMPTAB oA_[] =
|
|
{
|
|
oAa_, 2,
|
|
oAa_, 2,
|
|
oAa_, 2,
|
|
oAa_, 2,
|
|
oAa_, 2,
|
|
oAa_, 2,
|
|
oAa_, 2,
|
|
oAa_, 2,
|
|
oAb_, 2,
|
|
oAb_, 2,
|
|
oAb_, 2,
|
|
oAb_, 2,
|
|
oAb_, 2,
|
|
oAb_, 2,
|
|
oAb_, 2,
|
|
oAb_, 2
|
|
};
|
|
|
|
static const JMPTAB o9b_[] =
|
|
{
|
|
o9b0, F,
|
|
o9b1, F,
|
|
o9b2, F,
|
|
o9b3, F,
|
|
o9b4, F,
|
|
o9b5, F,
|
|
o9b6, F,
|
|
o9b7, F,
|
|
o9b8, F,
|
|
o9b9, F,
|
|
o9bA, F,
|
|
o9bB, F,
|
|
o9bC, F,
|
|
o9bD, F,
|
|
o9bE, F,
|
|
o9bF, F
|
|
};
|
|
|
|
static const JMPTAB o9a_[] =
|
|
{
|
|
o9a0, F,
|
|
o9a1, F,
|
|
o9a2, F,
|
|
o9a3, F,
|
|
o9a4, F,
|
|
o9a5, F,
|
|
o9a6, F,
|
|
o9a7, F,
|
|
o9a8, F,
|
|
o9a9, F,
|
|
o9aA, F,
|
|
o9aB, F,
|
|
o9aC, F,
|
|
o9aD, F,
|
|
o9aE, F,
|
|
o9aF, F
|
|
};
|
|
|
|
static const JMPTAB o9_[] =
|
|
{
|
|
o9a_, 2,
|
|
o9a_, 2,
|
|
o9a_, 2,
|
|
o9a_, 2,
|
|
o9a_, 2,
|
|
o9a_, 2,
|
|
o9a_, 2,
|
|
o9a_, 2,
|
|
o9b_, 2,
|
|
o9b_, 2,
|
|
o9b_, 2,
|
|
o9b_, 2,
|
|
o9b_, 2,
|
|
o9b_, 2,
|
|
o9b_, 2,
|
|
o9b_, 2
|
|
};
|
|
|
|
static const JMPTAB o8B_[] =
|
|
{
|
|
o8B0, F,
|
|
o8B1, F,
|
|
o8B2, F,
|
|
o8B3, F,
|
|
o8B4, F,
|
|
o8B5, F,
|
|
o8B6, F,
|
|
o8B7, F,
|
|
o8B8, F,
|
|
o8B9, F,
|
|
o8BA, F,
|
|
o8BB, F,
|
|
o8BC, F,
|
|
o8BD, F,
|
|
o8BE, F,
|
|
o8BF, F
|
|
};
|
|
|
|
static const JMPTAB o8A_[] =
|
|
{
|
|
o8A0, F,
|
|
o8A1, F,
|
|
o8A2, F,
|
|
o8A3, F,
|
|
o8A4, F,
|
|
o8A5, F,
|
|
o8A6, F,
|
|
o8A7, F,
|
|
o8A8, F,
|
|
o8A9, F,
|
|
o8AA, F,
|
|
o8AB, F,
|
|
o8AC, F,
|
|
o8AD, F,
|
|
o8AE, F,
|
|
o8AF, F
|
|
};
|
|
|
|
static const JMPTAB o81B_[] =
|
|
{
|
|
o_invalid4, F,
|
|
o81B1, F, // normally o_invalid4, beep patch
|
|
o81B2, F,
|
|
o81B3, F,
|
|
o81B4, F,
|
|
o81B5, F,
|
|
o81B6, F,
|
|
o81B7, F,
|
|
o_invalid4, F,
|
|
o_invalid4, F,
|
|
o_invalid4, F,
|
|
o_invalid4, F,
|
|
o_invalid4, F,
|
|
o_invalid4, F,
|
|
o_invalid4, F,
|
|
o_invalid4, F
|
|
};
|
|
|
|
static const JMPTAB o81Af2_[] =
|
|
{
|
|
o81Af20, F,
|
|
o81Af21, F,
|
|
o81Af22, F,
|
|
o81Af23, F,
|
|
o81Af24, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o81Af28, F,
|
|
o81Af29, F,
|
|
o81Af2A, F,
|
|
o81Af2B, F,
|
|
o81Af2C, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F
|
|
};
|
|
|
|
static const JMPTAB o81Af1_[] =
|
|
{
|
|
o81Af10, F,
|
|
o81Af11, F,
|
|
o81Af12, F,
|
|
o81Af13, F,
|
|
o81Af14, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o81Af18, F,
|
|
o81Af19, F,
|
|
o81Af1A, F,
|
|
o81Af1B, F,
|
|
o81Af1C, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F
|
|
};
|
|
|
|
static const JMPTAB o81Af0_[] =
|
|
{
|
|
o81Af00, F,
|
|
o81Af01, F,
|
|
o81Af02, F,
|
|
o81Af03, F,
|
|
o81Af04, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o81Af08, F,
|
|
o81Af09, F,
|
|
o81Af0A, F,
|
|
o81Af0B, F,
|
|
o81Af0C, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F
|
|
};
|
|
|
|
static const JMPTAB o81A_[] =
|
|
{
|
|
o81Af0_, 5,
|
|
o81Af1_, 5,
|
|
o81Af2_, 5,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F
|
|
};
|
|
|
|
static const JMPTAB o819_[] =
|
|
{
|
|
o819f0, F,
|
|
o819f1, F,
|
|
o819f2, F,
|
|
o819f3, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F
|
|
};
|
|
|
|
static const JMPTAB o818_[] =
|
|
{
|
|
o818f0x, F,
|
|
o818f1x, F,
|
|
o818f2x, F,
|
|
o818f3x, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o818f8x, F,
|
|
o818f9x, F,
|
|
o818fAx, F,
|
|
o818fBx, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F,
|
|
o_invalid6, F
|
|
};
|
|
|
|
static const JMPTAB o81_[] =
|
|
{
|
|
o810, F,
|
|
o811, F,
|
|
o812, F,
|
|
o813, F,
|
|
o814, F,
|
|
o815, F,
|
|
o816, F,
|
|
o817, F,
|
|
o818_, 4,
|
|
o819_, 4,
|
|
o81A_, 4,
|
|
o81B_, 3,
|
|
o81C, F,
|
|
o81D, F,
|
|
o81E, F,
|
|
o81F, F
|
|
};
|
|
|
|
static const JMPTAB o8081_[] =
|
|
{
|
|
o80810, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F,
|
|
o_invalid5, F
|
|
};
|
|
|
|
static const JMPTAB o808_[] =
|
|
{
|
|
o8080, F,
|
|
o8081_, 4,
|
|
o8082X, F,
|
|
o8083, F,
|
|
o8084n, F,
|
|
o8085n, F,
|
|
o8086n, F,
|
|
o8087n, F,
|
|
o8088n, F,
|
|
o8089n, F,
|
|
o808An, F,
|
|
o808Bn, F,
|
|
o808C, F,
|
|
o808D, F,
|
|
o808E, F,
|
|
o808F, F
|
|
};
|
|
|
|
static const JMPTAB o80_[] =
|
|
{
|
|
o800, F,
|
|
o801, F,
|
|
o802, F,
|
|
o803, F,
|
|
o804, F,
|
|
o805, F,
|
|
o806, F,
|
|
o807, F,
|
|
o808_, 3,
|
|
o809, F,
|
|
o80A, F,
|
|
o80B, F,
|
|
o80Cn, F,
|
|
o80Dn, F,
|
|
o80E, F,
|
|
o80Fn, F
|
|
};
|
|
|
|
static const JMPTAB o8_[] =
|
|
{
|
|
o80_, 2,
|
|
o81_, 2,
|
|
o82n, F,
|
|
o83n, F,
|
|
o84n, F,
|
|
o85n, F,
|
|
o86n, F,
|
|
o87n, F,
|
|
o88n, F,
|
|
o89n, F,
|
|
o8A_, 2,
|
|
o8B_, 2,
|
|
o8Cd4, F,
|
|
o8Dd5, F,
|
|
o8Ed4, F,
|
|
o8Fd5, F
|
|
};
|
|
|
|
static const JMPTAB o15_[] =
|
|
{
|
|
o150a, F,
|
|
o151a, F,
|
|
o152a, F,
|
|
o153a, F,
|
|
o154a, F,
|
|
o155a, F,
|
|
o156a, F,
|
|
o157a, F,
|
|
o158x, F,
|
|
o159x, F,
|
|
o15Ax, F,
|
|
o15Bx, F,
|
|
o15Cx, F,
|
|
o15Dx, F,
|
|
o15Ex, F,
|
|
o15Fx, F
|
|
};
|
|
|
|
static const JMPTAB o14_[] =
|
|
{
|
|
o140, F,
|
|
o141, F,
|
|
o142, F,
|
|
o143, F,
|
|
o144, F,
|
|
o145, F,
|
|
o146, F,
|
|
o147, F,
|
|
o148, F,
|
|
o149, F,
|
|
o14A, F,
|
|
o14B, F,
|
|
o14C, F,
|
|
o14D, F,
|
|
o14E, F,
|
|
o14F, F
|
|
};
|
|
|
|
static const JMPTAB o13_[] =
|
|
{
|
|
o130, F,
|
|
o131, F,
|
|
o132, F,
|
|
o133, F,
|
|
o134, F,
|
|
o135, F,
|
|
o136, F,
|
|
o137, F,
|
|
o138, F,
|
|
o139, F,
|
|
o13A, F,
|
|
o13B, F,
|
|
o13C, F,
|
|
o13D, F,
|
|
o13E, F,
|
|
o13F, F
|
|
};
|
|
|
|
static const JMPTAB o12_[] =
|
|
{
|
|
o120, F,
|
|
o121, F,
|
|
o122, F,
|
|
o123, F,
|
|
o124, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o128, F,
|
|
o129, F,
|
|
o12A, F,
|
|
o12B, F,
|
|
o12C, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F
|
|
};
|
|
|
|
static const JMPTAB o11_[] =
|
|
{
|
|
o110, F,
|
|
o111, F,
|
|
o112, F,
|
|
o113, F,
|
|
o114, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o118, F,
|
|
o119, F,
|
|
o11A, F,
|
|
o11B, F,
|
|
o11C, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F
|
|
};
|
|
|
|
static const JMPTAB o10_[] =
|
|
{
|
|
o100, F,
|
|
o101, F,
|
|
o102, F,
|
|
o103, F,
|
|
o104, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o108, F,
|
|
o109, F,
|
|
o10A, F,
|
|
o10B, F,
|
|
o10C, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F,
|
|
o_invalid3, F
|
|
};
|
|
|
|
static const JMPTAB o1_[] =
|
|
{
|
|
o10_, 2,
|
|
o11_, 2,
|
|
o12_, 2,
|
|
o13_, 2,
|
|
o14_, 2,
|
|
o15_, 2,
|
|
o16x, F,
|
|
o17x, F,
|
|
o18x, F,
|
|
o19d2, F,
|
|
o1Ad4, F,
|
|
o1Bd5, F,
|
|
o1Cx, F,
|
|
o1Dd2, F,
|
|
o1Ed4, F,
|
|
o1Fd5, F
|
|
};
|
|
|
|
static const JMPTAB o0E_[] =
|
|
{
|
|
o0Ef0, F,
|
|
o0Ef1, F,
|
|
o0Ef2, F,
|
|
o0Ef3, F,
|
|
o0Ef4, F,
|
|
o0Ef5, F,
|
|
o0Ef6, F,
|
|
o0Ef7, F,
|
|
o0Ef8, F,
|
|
o0Ef9, F,
|
|
o0EfA, F,
|
|
o0EfB, F,
|
|
o0EfC, F,
|
|
o0EfD, F,
|
|
o0EfE, F,
|
|
o0EfF, F
|
|
};
|
|
|
|
static const JMPTAB o0_[] =
|
|
{
|
|
o00, F,
|
|
o01, F,
|
|
o02, F,
|
|
o03, F,
|
|
o04, F,
|
|
o05, F,
|
|
o06, F,
|
|
o07, F,
|
|
o08, F,
|
|
o09, F,
|
|
o0A, F,
|
|
o0B, F,
|
|
o0C, F,
|
|
o0D, F,
|
|
o0E_, 3,
|
|
o0F, F
|
|
};
|
|
|
|
static const JMPTAB o_[] =
|
|
{
|
|
o0_, 1,
|
|
o1_, 1,
|
|
o2n, F,
|
|
o3X, F,
|
|
o4d2, F,
|
|
o5d2, F,
|
|
o6d3, F,
|
|
o7d3, F,
|
|
o8_, 1,
|
|
o9_, 1,
|
|
oA_, 1,
|
|
oB_, 1,
|
|
oC_, 1,
|
|
oD_, 1,
|
|
oE_, 1,
|
|
oF_, 1
|
|
};
|
|
|
|
// opcode dispatcher
|
|
VOID EvalOpcode(LPBYTE I)
|
|
{
|
|
DWORD dwTemp,dwIndex = 0;
|
|
JMPTAB const *pJmpTab = o_;
|
|
|
|
do
|
|
{
|
|
dwTemp = I[dwIndex]; // table entry
|
|
_ASSERT(dwTemp <= 0xf); // found packed data
|
|
dwIndex = pJmpTab[dwTemp].dwTyp; // next pointer type
|
|
pJmpTab = pJmpTab[dwTemp].pLnk; // next pointer to table/function
|
|
}
|
|
while (dwIndex != F); // reference to table? -> again
|
|
|
|
((VOID (*)(LPBYTE)) pJmpTab)(I); // call function
|
|
return;
|
|
}
|