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x86mods.js
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/**
* @fileoverview Implements PCx86 ModRegRM decoders
* @author <a href="mailto:[email protected]">Jeff Parsons</a>
* @copyright © 2012-2020 Jeff Parsons
*
* This file is part of PCjs, a computer emulation software project at <https://www.pcjs.org>.
*
* PCjs is free software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCjs. If not,
* see <http://www.gnu.org/licenses/gpl.html>.
*
* You are required to include the above copyright notice in every modified copy of this work
* and to display that copyright notice when the software starts running; see COPYRIGHT in
* <https://www.pcjs.org/modules/shared/lib/defines.js>.
*
* Some PCjs files also attempt to load external resource files, such as character-image files,
* ROM files, and disk image files. Those external resource files are not considered part of PCjs
* for purposes of the GNU General Public License, and the author does not claim any copyright
* as to their contents.
*/
"use strict";
if (typeof module !== "undefined") {
var Str = require("../../shared/lib/strlib");
var X86 = require("./x86");
}
/*
* Before 80386 support was added to PCx86, the approach to decoding ModRegRM bytes (which I usually
* just call ModRM bytes) used one generated function per ModRM value. This was optimal for 16-bit processors,
* because the functions were small, and it was maximally efficient, turning the entire ModRM decoding operation
* into one table lookup and function call.
*
* However, that approach didn't scale well for 32-bit processors, which had extended ModRM capabilities in both
* the addressing mode dimension and the operand size dimension. So I've rewritten ModRM decoding as 18 functions.
* The first 9 are for 16-bit addressing modes, and the second 9 are for 32-bit addressing modes. Within each
* group of 9, there are 3 for 8-bit operands, 3 for 16-bit operands, and 3 for 32-bit operands. And each group of 3
* contains functions for register-source, memory-source, and group-source.
*
* Each of the 18 functions must do additional work to examine the ModRM bits, which makes decoding slightly slower,
* but it's not really noticeable, and the speed difference didn't justify the additional generated code. So one much
* smaller file (x86mods.js) replaces a host of older files (x86modb.js, x86modw.js, x86modb16.js, x86modw16.js,
* x86modb32.js, x86modw32.js, and x86modsib.js).
*
* You can dig up the older files from the repository if you're curious, or you can run /modules/pcx86/bin/x86gen.js to
* get a sense of what they contained (x86gen.js created most of the code, but it still had to be massaged afterward).
*/
/**
* modRegByte16(fn)
*
* @this {CPUx86}
* @param {function(number,number)} fn (dst,src)
*/
X86.modRegByte16 = function(fn)
{
let dst, src;
let bModRM = (this.bModRM = this.getIPByte()) & 0xC7;
switch(bModRM) {
case 0x00:
src = this.getEAByteData(this.regEBX + this.regESI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndex;
break;
case 0x01:
src = this.getEAByteData(this.regEBX + this.regEDI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexExtra;
break;
case 0x02:
src = this.getEAByteStack(this.regEBP + this.regESI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexExtra;
break;
case 0x03:
src = this.getEAByteStack(this.regEBP + this.regEDI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndex;
break;
case 0x04:
src = this.getEAByteData(this.regESI);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x05:
src = this.getEAByteData(this.regEDI);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x06:
src = this.getEAByteData(this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesDisp;
break;
case 0x07:
src = this.getEAByteData(this.regEBX);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x40:
src = this.getEAByteData(this.regEBX + this.regESI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x41:
src = this.getEAByteData(this.regEBX + this.regEDI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x42:
src = this.getEAByteStack(this.regEBP + this.regESI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x43:
src = this.getEAByteStack(this.regEBP + this.regEDI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x44:
src = this.getEAByteData(this.regESI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x45:
src = this.getEAByteData(this.regEDI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x46:
src = this.getEAByteStack(this.regEBP + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x47:
src = this.getEAByteData(this.regEBX + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x80:
src = this.getEAByteData(this.regEBX + this.regESI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x81:
src = this.getEAByteData(this.regEBX + this.regEDI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x82:
src = this.getEAByteStack(this.regEBP + this.regESI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x83:
src = this.getEAByteStack(this.regEBP + this.regEDI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x84:
src = this.getEAByteData(this.regESI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x85:
src = this.getEAByteData(this.regEDI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x86:
src = this.getEAByteStack(this.regEBP + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x87:
src = this.getEAByteData(this.regEBX + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0xC0:
src = this.regEAX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiAL;
break;
case 0xC1:
src = this.regECX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiCL;
break;
case 0xC2:
src = this.regEDX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiDL;
break;
case 0xC3:
src = this.regEBX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiBL;
break;
case 0xC4:
src = (this.regEAX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiAH;
break;
case 0xC5:
src = (this.regECX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiCH;
break;
case 0xC6:
src = (this.regEDX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiDH;
break;
case 0xC7:
src = (this.regEBX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiBH;
break;
default:
src = 0;
this.assert(false, "modRegByte16(): unrecognized modrm byte " + Str.toHexByte(bModRM));
break;
}
let reg = (this.bModRM >> 3) & 0x7;
switch(reg) {
case 0x0:
dst = this.regEAX & 0xff;
break;
case 0x1:
dst = this.regECX & 0xff;
break;
case 0x2:
dst = this.regEDX & 0xff;
break;
case 0x3:
dst = this.regEBX & 0xff;
break;
case 0x4:
dst = (this.regEAX >> 8) & 0xff;
break;
case 0x5:
dst = (this.regECX >> 8) & 0xff;
break;
case 0x6:
dst = (this.regEDX >> 8) & 0xff;
break;
case 0x7:
dst = (this.regEBX >> 8) & 0xff;
break;
default:
dst = 0;
break;
}
let b = fn.call(this, dst, src);
switch(reg) {
case 0x0:
this.regEAX = (this.regEAX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiAL = this.backTrack.btiEALo;
break;
case 0x1:
this.regECX = (this.regECX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiCL = this.backTrack.btiEALo;
break;
case 0x2:
this.regEDX = (this.regEDX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiDL = this.backTrack.btiEALo;
break;
case 0x3:
this.regEBX = (this.regEBX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiBL = this.backTrack.btiEALo;
break;
case 0x4:
this.regEAX = (this.regEAX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiAH = this.backTrack.btiEALo;
break;
case 0x5:
this.regECX = (this.regECX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiCH = this.backTrack.btiEALo;
break;
case 0x6:
this.regEDX = (this.regEDX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiDH = this.backTrack.btiEALo;
break;
case 0x7:
this.regEBX = (this.regEBX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiBH = this.backTrack.btiEALo;
break;
}
};
/**
* modMemByte16(fn)
*
* @this {CPUx86}
* @param {function(number,number)} fn (dst,src)
*/
X86.modMemByte16 = function(fn)
{
let dst, src;
let bModRM = (this.bModRM = this.getIPByte()) & 0xC7;
switch(bModRM) {
case 0x00:
dst = this.getEAByteData(this.regEBX + this.regESI);
this.regEAWrite = this.regEA;
break;
case 0x01:
dst = this.getEAByteData(this.regEBX + this.regEDI);
this.regEAWrite = this.regEA;
break;
case 0x02:
dst = this.getEAByteStack(this.regEBP + this.regESI);
this.regEAWrite = this.regEA;
break;
case 0x03:
dst = this.getEAByteStack(this.regEBP + this.regEDI);
this.regEAWrite = this.regEA;
break;
case 0x04:
dst = this.getEAByteData(this.regESI);
this.regEAWrite = this.regEA;
break;
case 0x05:
dst = this.getEAByteData(this.regEDI);
this.regEAWrite = this.regEA;
break;
case 0x06:
dst = this.getEAByteData(this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x07:
dst = this.getEAByteData(this.regEBX);
this.regEAWrite = this.regEA;
break;
case 0x40:
dst = this.getEAByteData(this.regEBX + this.regESI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x41:
dst = this.getEAByteData(this.regEBX + this.regEDI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x42:
dst = this.getEAByteStack(this.regEBP + this.regESI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x43:
dst = this.getEAByteStack(this.regEBP + this.regEDI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x44:
dst = this.getEAByteData(this.regESI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x45:
dst = this.getEAByteData(this.regEDI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x46:
dst = this.getEAByteStack(this.regEBP + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x47:
dst = this.getEAByteData(this.regEBX + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x80:
dst = this.getEAByteData(this.regEBX + this.regESI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x81:
dst = this.getEAByteData(this.regEBX + this.regEDI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x82:
dst = this.getEAByteStack(this.regEBP + this.regESI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x83:
dst = this.getEAByteStack(this.regEBP + this.regEDI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x84:
dst = this.getEAByteData(this.regESI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x85:
dst = this.getEAByteData(this.regEDI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x86:
dst = this.getEAByteStack(this.regEBP + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x87:
dst = this.getEAByteData(this.regEBX + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0xC0:
dst = this.regEAX & 0xff;
break;
case 0xC1:
dst = this.regECX & 0xff;
break;
case 0xC2:
dst = this.regEDX & 0xff;
break;
case 0xC3:
dst = this.regEBX & 0xff;
break;
case 0xC4:
dst = (this.regEAX >> 8) & 0xff;
break;
case 0xC5:
dst = (this.regECX >> 8) & 0xff;
break;
case 0xC6:
dst = (this.regEDX >> 8) & 0xff;
break;
case 0xC7:
dst = (this.regEBX >> 8) & 0xff;
break;
default:
dst = 0;
this.assert(false, "modMemByte16(): unrecognized modrm byte " + Str.toHexByte(bModRM));
break;
}
let reg = (this.bModRM >> 3) & 0x7;
switch(reg) {
case 0x0:
src = this.regEAX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiAL;
break;
case 0x1:
src = this.regECX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiCL;
break;
case 0x2:
src = this.regEDX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiDL;
break;
case 0x3:
src = this.regEBX & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiBL;
break;
case 0x4:
src = (this.regEAX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiAH;
break;
case 0x5:
src = (this.regECX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiCH;
break;
case 0x6:
src = (this.regEDX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiDH;
break;
case 0x7:
src = (this.regEBX >> 8) & 0xff;
if (BACKTRACK) this.backTrack.btiEALo = this.backTrack.btiBH;
break;
default:
src = 0;
break;
}
let b = fn.call(this, dst, src);
switch(bModRM) {
case 0x00:
case 0x03:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndex;
break;
case 0x01:
case 0x02:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexExtra;
break;
case 0x04:
case 0x05:
case 0x07:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x06:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesDisp;
break;
case 0x40:
case 0x43:
case 0x80:
case 0x83:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x41:
case 0x42:
case 0x81:
case 0x82:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x44:
case 0x45:
case 0x46:
case 0x47:
case 0x84:
case 0x85:
case 0x86:
case 0x87:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0xC0:
this.regEAX = (this.regEAX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiAL = this.backTrack.btiEALo;
break;
case 0xC1:
this.regECX = (this.regECX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiCL = this.backTrack.btiEALo;
break;
case 0xC2:
this.regEDX = (this.regEDX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiDL = this.backTrack.btiEALo;
break;
case 0xC3:
this.regEBX = (this.regEBX & ~0xff) | b;
if (BACKTRACK) this.backTrack.btiBL = this.backTrack.btiEALo;
break;
case 0xC4:
this.regEAX = (this.regEAX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiAH = this.backTrack.btiEALo;
break;
case 0xC5:
this.regECX = (this.regECX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiCH = this.backTrack.btiEALo;
break;
case 0xC6:
this.regEDX = (this.regEDX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiDH = this.backTrack.btiEALo;
break;
case 0xC7:
this.regEBX = (this.regEBX & ~0xff00) | (b << 8);
if (BACKTRACK) this.backTrack.btiBH = this.backTrack.btiEALo;
break;
default:
this.assert(false, "modMemByte16(): unrecognized modrm byte " + Str.toHexByte(bModRM));
break;
}
};
/**
* modGrpByte16(afnGrp, fnSrc)
*
* @this {CPUx86}
* @param {Array.<function(number,number)>} afnGrp
* @param {function()} fnSrc
*/
X86.modGrpByte16 = function(afnGrp, fnSrc)
{
let dst;
let bModRM = (this.bModRM = this.getIPByte()) & 0xC7;
switch(bModRM) {
case 0x00:
dst = this.getEAByteData(this.regEBX + this.regESI);
this.regEAWrite = this.regEA;
break;
case 0x01:
dst = this.getEAByteData(this.regEBX + this.regEDI);
this.regEAWrite = this.regEA;
break;
case 0x02:
dst = this.getEAByteStack(this.regEBP + this.regESI);
this.regEAWrite = this.regEA;
break;
case 0x03:
dst = this.getEAByteStack(this.regEBP + this.regEDI);
this.regEAWrite = this.regEA;
break;
case 0x04:
dst = this.getEAByteData(this.regESI);
this.regEAWrite = this.regEA;
break;
case 0x05:
dst = this.getEAByteData(this.regEDI);
this.regEAWrite = this.regEA;
break;
case 0x06:
dst = this.getEAByteData(this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x07:
dst = this.getEAByteData(this.regEBX);
this.regEAWrite = this.regEA;
break;
case 0x40:
dst = this.getEAByteData(this.regEBX + this.regESI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x41:
dst = this.getEAByteData(this.regEBX + this.regEDI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x42:
dst = this.getEAByteStack(this.regEBP + this.regESI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x43:
dst = this.getEAByteStack(this.regEBP + this.regEDI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x44:
dst = this.getEAByteData(this.regESI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x45:
dst = this.getEAByteData(this.regEDI + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x46:
dst = this.getEAByteStack(this.regEBP + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x47:
dst = this.getEAByteData(this.regEBX + this.getIPDisp());
this.regEAWrite = this.regEA;
break;
case 0x80:
dst = this.getEAByteData(this.regEBX + this.regESI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x81:
dst = this.getEAByteData(this.regEBX + this.regEDI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x82:
dst = this.getEAByteStack(this.regEBP + this.regESI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x83:
dst = this.getEAByteStack(this.regEBP + this.regEDI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x84:
dst = this.getEAByteData(this.regESI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x85:
dst = this.getEAByteData(this.regEDI + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x86:
dst = this.getEAByteStack(this.regEBP + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0x87:
dst = this.getEAByteData(this.regEBX + this.getIPAddr());
this.regEAWrite = this.regEA;
break;
case 0xC0:
dst = this.regEAX & 0xff;
break;
case 0xC1:
dst = this.regECX & 0xff;
break;
case 0xC2:
dst = this.regEDX & 0xff;
break;
case 0xC3:
dst = this.regEBX & 0xff;
break;
case 0xC4:
dst = (this.regEAX >> 8) & 0xff;
break;
case 0xC5:
dst = (this.regECX >> 8) & 0xff;
break;
case 0xC6:
dst = (this.regEDX >> 8) & 0xff;
break;
case 0xC7:
dst = (this.regEBX >> 8) & 0xff;
break;
default:
dst = 0;
this.assert(false, "modGrpByte16(): unrecognized modrm byte " + Str.toHexByte(bModRM));
break;
}
let reg = (this.bModRM >> 3) & 0x7;
let b = afnGrp[reg].call(this, dst, fnSrc.call(this));
switch(bModRM) {
case 0x00:
case 0x03:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndex;
break;
case 0x01:
case 0x02:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexExtra;
break;
case 0x04:
case 0x05:
case 0x07:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x06:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesDisp;
break;
case 0x40:
case 0x43:
case 0x80:
case 0x83:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x41:
case 0x42:
case 0x81:
case 0x82:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x44:
case 0x45:
case 0x46:
case 0x47:
case 0x84:
case 0x85:
case 0x86:
case 0x87:
this.setEAByte(b);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0xC0:
this.regEAX = (this.regEAX & ~0xff) | b;
break;
case 0xC1:
this.regECX = (this.regECX & ~0xff) | b;
break;
case 0xC2:
this.regEDX = (this.regEDX & ~0xff) | b;
break;
case 0xC3:
this.regEBX = (this.regEBX & ~0xff) | b;
break;
case 0xC4:
this.regEAX = (this.regEAX & ~0xff00) | (b << 8);
break;
case 0xC5:
this.regECX = (this.regECX & ~0xff00) | (b << 8);
break;
case 0xC6:
this.regEDX = (this.regEDX & ~0xff00) | (b << 8);
break;
case 0xC7:
this.regEBX = (this.regEBX & ~0xff00) | (b << 8);
break;
}
};
/**
* modRegShort16(fn)
*
* @this {CPUx86}
* @param {function(number,number)} fn (dst,src)
*/
X86.modRegShort16 = function(fn)
{
let dst, src;
let bModRM = (this.bModRM = this.getIPByte()) & 0xC7;
switch(bModRM) {
case 0x00:
src = this.getEAShortData(this.regEBX + this.regESI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndex;
break;
case 0x01:
src = this.getEAShortData(this.regEBX + this.regEDI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexExtra;
break;
case 0x02:
src = this.getEAShortStack(this.regEBP + this.regESI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexExtra;
break;
case 0x03:
src = this.getEAShortStack(this.regEBP + this.regEDI);
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndex;
break;
case 0x04:
src = this.getEAShortData(this.regESI);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x05:
src = this.getEAShortData(this.regEDI);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x06:
src = this.getEAShortData(this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesDisp;
break;
case 0x07:
src = this.getEAShortData(this.regEBX);
this.nStepCycles -= this.cycleCounts.nEACyclesBase;
break;
case 0x40:
src = this.getEAShortData(this.regEBX + this.regESI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x41:
src = this.getEAShortData(this.regEBX + this.regEDI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x42:
src = this.getEAShortStack(this.regEBP + this.regESI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x43:
src = this.getEAShortStack(this.regEBP + this.regEDI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x44:
src = this.getEAShortData(this.regESI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x45:
src = this.getEAShortData(this.regEDI + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x46:
src = this.getEAShortStack(this.regEBP + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x47:
src = this.getEAShortData(this.regEBX + this.getIPDisp());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x80:
src = this.getEAShortData(this.regEBX + this.regESI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x81:
src = this.getEAShortData(this.regEBX + this.regEDI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x82:
src = this.getEAShortStack(this.regEBP + this.regESI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDispExtra;
break;
case 0x83:
src = this.getEAShortStack(this.regEBP + this.regEDI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseIndexDisp;
break;
case 0x84:
src = this.getEAShortData(this.regESI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x85:
src = this.getEAShortData(this.regEDI + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x86:
src = this.getEAShortStack(this.regEBP + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0x87:
src = this.getEAShortData(this.regEBX + this.getIPAddr());
this.nStepCycles -= this.cycleCounts.nEACyclesBaseDisp;
break;
case 0xC0:
src = this.regEAX & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = this.backTrack.btiAL; this.backTrack.btiEAHi = this.backTrack.btiAH;
}
break;
case 0xC1:
src = this.regECX & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = this.backTrack.btiCL; this.backTrack.btiEAHi = this.backTrack.btiCH;
}
break;
case 0xC2:
src = this.regEDX & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = this.backTrack.btiDL; this.backTrack.btiEAHi = this.backTrack.btiDH;
}
break;
case 0xC3:
src = this.regEBX & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = this.backTrack.btiBL; this.backTrack.btiEAHi = this.backTrack.btiBH;
}
break;
case 0xC4:
src = this.getSP() & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = X86.BTINFO.SP_LO; this.backTrack.btiEAHi = X86.BTINFO.SP_HI;
}
break;
case 0xC5:
src = this.regEBP & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = this.backTrack.btiBPLo; this.backTrack.btiEAHi = this.backTrack.btiBPHi;
}
break;
case 0xC6:
src = this.regESI & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = this.backTrack.btiSILo; this.backTrack.btiEAHi = this.backTrack.btiSIHi;
}
break;
case 0xC7:
src = this.regEDI & 0xffff;
if (BACKTRACK) {
this.backTrack.btiEALo = this.backTrack.btiDILo; this.backTrack.btiEAHi = this.backTrack.btiDIHi;
}
break;
default:
src = 0;
this.assert(false, "modRegShort16(): unrecognized modrm byte " + Str.toHexByte(bModRM));
break;
}
let reg = (this.bModRM >> 3) & 0x7;
switch(reg) {
case 0x0:
dst = this.regEAX & 0xffff;
break;
case 0x1:
dst = this.regECX & 0xffff;
break;
case 0x2:
dst = this.regEDX & 0xffff;
break;
case 0x3:
dst = this.regEBX & 0xffff;
break;
case 0x4:
dst = this.getSP() & 0xffff;
break;
case 0x5:
dst = this.regEBP & 0xffff;
break;
case 0x6:
dst = this.regESI & 0xffff;
break;
case 0x7:
dst = this.regEDI & 0xffff;
break;
default:
dst = 0;
break;
}
let w = fn.call(this, dst, src);
switch(reg) {
case 0x0:
this.regEAX = (this.regEAX & ~0xffff) | w;
if (BACKTRACK) {
this.backTrack.btiAL = this.backTrack.btiEALo; this.backTrack.btiAH = this.backTrack.btiEAHi;
}
break;
case 0x1:
this.regECX = (this.regECX & ~0xffff) | w;
if (BACKTRACK) {
this.backTrack.btiCL = this.backTrack.btiEALo; this.backTrack.btiCH = this.backTrack.btiEAHi;
}
break;
case 0x2:
this.regEDX = (this.regEDX & ~0xffff) | w;
if (BACKTRACK) {
this.backTrack.btiDL = this.backTrack.btiEALo; this.backTrack.btiDH = this.backTrack.btiEAHi;
}
break;
case 0x3:
this.regEBX = (this.regEBX & ~0xffff) | w;
if (BACKTRACK) {
this.backTrack.btiBL = this.backTrack.btiEALo; this.backTrack.btiBH = this.backTrack.btiEAHi;
}
break;
case 0x4:
this.setSP((this.getSP() & ~0xffff) | w);
break;
case 0x5:
this.regEBP = (this.regEBP & ~0xffff) | w;
if (BACKTRACK) {
this.backTrack.btiBPLo = this.backTrack.btiEALo; this.backTrack.btiBPHi = this.backTrack.btiEAHi;
}
break;
case 0x6:
this.regESI = (this.regESI & ~0xffff) | w;
if (BACKTRACK) {
this.backTrack.btiSILo = this.backTrack.btiEALo; this.backTrack.btiSIHi = this.backTrack.btiEAHi;
}
break;
case 0x7:
this.regEDI = (this.regEDI & ~0xffff) | w;
if (BACKTRACK) {
this.backTrack.btiDILo = this.backTrack.btiEALo; this.backTrack.btiDIHi = this.backTrack.btiEAHi;
}
break;
}
};
/**
* modMemShort16(fn)
*