x86Lib - I\'ve ported my library x86Lib to mbed. It fully …

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I\'ve ported my library x86Lib to mbed. It fully emulates the 8086 processor, but a few things I\'m still working on. Notable missing things are interrupts. Previously I used exceptions for interrupts, but exceptions aren\'t supported with the mbed compiler. It is also quite slow

Dependents: x86Lib_Tester

ops/etc.cpp@0:217a7931b41f, 2012-03-04 (annotated)

Committer:: earlz
Date:: Sun Mar 04 08:15:47 2012 +0000
Revision:: 0:217a7931b41f

Who changed what in which revision?

User	Revision	Line number	New contents of line
earlz	0:217a7931b41f	1	/**
earlz	0:217a7931b41f	2	Copyright (c) 2007 - 2009 Jordan "Earlz/hckr83" Earls <http://www.Earlz.biz.tm>
earlz	0:217a7931b41f	3	All rights reserved.
earlz	0:217a7931b41f	4
earlz	0:217a7931b41f	5	Redistribution and use in source and binary forms, with or without
earlz	0:217a7931b41f	6	modification, are permitted provided that the following conditions
earlz	0:217a7931b41f	7	are met:
earlz	0:217a7931b41f	8
earlz	0:217a7931b41f	9	1. Redistributions of source code must retain the above copyright
earlz	0:217a7931b41f	10	notice, this list of conditions and the following disclaimer.
earlz	0:217a7931b41f	11	2. Redistributions in binary form must reproduce the above copyright
earlz	0:217a7931b41f	12	notice, this list of conditions and the following disclaimer in the
earlz	0:217a7931b41f	13	documentation and/or other materials provided with the distribution.
earlz	0:217a7931b41f	14	3. The name of the author may not be used to endorse or promote products
earlz	0:217a7931b41f	15	derived from this software without specific prior written permission.
earlz	0:217a7931b41f	16
earlz	0:217a7931b41f	17	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
earlz	0:217a7931b41f	18	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
earlz	0:217a7931b41f	19	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
earlz	0:217a7931b41f	20	THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
earlz	0:217a7931b41f	21	EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
earlz	0:217a7931b41f	22	PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
earlz	0:217a7931b41f	23	OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
earlz	0:217a7931b41f	24	WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
earlz	0:217a7931b41f	25	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
earlz	0:217a7931b41f	26	ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
earlz	0:217a7931b41f	27
earlz	0:217a7931b41f	28	This file is part of the x86Lib project.
earlz	0:217a7931b41f	29	**/
earlz	0:217a7931b41f	30	#define X86LIB_BUILD
earlz	0:217a7931b41f	31	#include <x86Lib.h>
earlz	0:217a7931b41f	32
earlz	0:217a7931b41f	33
earlz	0:217a7931b41f	34	namespace x86Lib{
earlz	0:217a7931b41f	35
earlz	0:217a7931b41f	36	void x86CPU::op16_nop(){ //0x90
earlz	0:217a7931b41f	37	//do nothing
earlz	0:217a7931b41f	38	}
earlz	0:217a7931b41f	39
earlz	0:217a7931b41f	40	void x86CPU::op16_hlt(){ //0xF4
earlz	0:217a7931b41f	41	if(freg._if==0){
earlz	0:217a7931b41f	42	Onx86LibError();
earlz	0:217a7931b41f	43	//throw CpuPanic_excp("HLT With IF=0; Nothing to do",CLIHLT_EXCP);
earlz	0:217a7931b41f	44	}
earlz	0:217a7931b41f	45	}
earlz	0:217a7931b41f	46
earlz	0:217a7931b41f	47	void x86CPU::op16_unknown(){
earlz	0:217a7931b41f	48	Onx86LibError();
earlz	0:217a7931b41f	49	//throw CpuInt_excp(UNK_IEXCP);
earlz	0:217a7931b41f	50	}
earlz	0:217a7931b41f	51
earlz	0:217a7931b41f	52
earlz	0:217a7931b41f	53
earlz	0:217a7931b41f	54
earlz	0:217a7931b41f	55	//Segment overrides...
earlz	0:217a7931b41f	56	void x86CPU::op16_pre_es_override(){ //0x26
earlz	0:217a7931b41f	57	SetSegments(cES);
earlz	0:217a7931b41f	58	eip++;
earlz	0:217a7931b41f	59	(uint32_t)&op_cache=ReadDword(cCS,eip);
earlz	0:217a7931b41f	60	(this->*Opcodes[op_cache[0]])();
earlz	0:217a7931b41f	61
earlz	0:217a7931b41f	62	ResetSegments();
earlz	0:217a7931b41f	63	}
earlz	0:217a7931b41f	64
earlz	0:217a7931b41f	65	void x86CPU::op16_pre_ds_override(){ //0x3E
earlz	0:217a7931b41f	66	SetSegments(cDS);
earlz	0:217a7931b41f	67	eip++;
earlz	0:217a7931b41f	68	(uint32_t)&op_cache=ReadDword(cCS,eip);
earlz	0:217a7931b41f	69	(this->*Opcodes[op_cache[0]])();
earlz	0:217a7931b41f	70
earlz	0:217a7931b41f	71	ResetSegments();
earlz	0:217a7931b41f	72	}
earlz	0:217a7931b41f	73
earlz	0:217a7931b41f	74	void x86CPU::op16_pre_ss_override(){ //0x36
earlz	0:217a7931b41f	75	SetSegments(cSS);
earlz	0:217a7931b41f	76	eip++;
earlz	0:217a7931b41f	77	(uint32_t)&op_cache=ReadDword(cCS,eip);
earlz	0:217a7931b41f	78	(this->*Opcodes[op_cache[0]])();
earlz	0:217a7931b41f	79
earlz	0:217a7931b41f	80	ResetSegments();
earlz	0:217a7931b41f	81	}
earlz	0:217a7931b41f	82
earlz	0:217a7931b41f	83	void x86CPU::op16_pre_cs_override(){ //0x2E
earlz	0:217a7931b41f	84	SetSegments(cCS);
earlz	0:217a7931b41f	85	eip++;
earlz	0:217a7931b41f	86	(uint32_t)&op_cache=ReadDword(cCS,eip);
earlz	0:217a7931b41f	87	(this->*Opcodes[op_cache[0]])();
earlz	0:217a7931b41f	88
earlz	0:217a7931b41f	89	ResetSegments();
earlz	0:217a7931b41f	90	}
earlz	0:217a7931b41f	91
earlz	0:217a7931b41f	92	void x86CPU::op16_rep(){ //repe and repne..(different opcodes, but I make them possible to use the same function)
earlz	0:217a7931b41f	93	//use a string_compares variable...
earlz	0:217a7931b41f	94	if(*regs16[CX]==0){ //for this, not executing the instruction is almost as expensive...
earlz	0:217a7931b41f	95	(uint16_t)&op_cache=ReadWord(cCS,eip+1);
earlz	0:217a7931b41f	96	int i=0;
earlz	0:217a7931b41f	97	//get size of opcode and prefixes....
earlz	0:217a7931b41f	98	for(i=0;i<4;i++){
earlz	0:217a7931b41f	99	switch(op_cache[i]){
earlz	0:217a7931b41f	100	case 0x67:
earlz	0:217a7931b41f	101	case 0x66:
earlz	0:217a7931b41f	102	case 0x2E:
earlz	0:217a7931b41f	103	case 0x36:
earlz	0:217a7931b41f	104	case 0x3E:
earlz	0:217a7931b41f	105	case 0x26:
earlz	0:217a7931b41f	106	case 0x64:
earlz	0:217a7931b41f	107	case 0x65:
earlz	0:217a7931b41f	108	eip++;
earlz	0:217a7931b41f	109	break;
earlz	0:217a7931b41f	110	default:
earlz	0:217a7931b41f	111	eip++;
earlz	0:217a7931b41f	112	return;
earlz	0:217a7931b41f	113	}
earlz	0:217a7931b41f	114	}
earlz	0:217a7931b41f	115	return;
earlz	0:217a7931b41f	116	}else{
earlz	0:217a7931b41f	117	uint32_t tmp=eip;
earlz	0:217a7931b41f	118	uint8_t t2=op_cache[0];
earlz	0:217a7931b41f	119	eip++;
earlz	0:217a7931b41f	120	(uint32_t)&op_cache=ReadDword(cCS,eip);
earlz	0:217a7931b41f	121	(this->*Opcodes[op_cache[0]])();
earlz	0:217a7931b41f	122	(*regs16[CX])--;
earlz	0:217a7931b41f	123	eip=tmp-1;
earlz	0:217a7931b41f	124	if(string_compares==1){
earlz	0:217a7931b41f	125	string_compares=0;
earlz	0:217a7931b41f	126	if(t2==0xF2){ //repNE
earlz	0:217a7931b41f	127	if(freg.zf==1){ //exit...
earlz	0:217a7931b41f	128	eip+=2;
earlz	0:217a7931b41f	129	return;
earlz	0:217a7931b41f	130	}
earlz	0:217a7931b41f	131	}else{
earlz	0:217a7931b41f	132	if((volatile uint8_t)freg.zf==0){ //exit...
earlz	0:217a7931b41f	133	eip+=2;
earlz	0:217a7931b41f	134	return;
earlz	0:217a7931b41f	135	}
earlz	0:217a7931b41f	136	}
earlz	0:217a7931b41f	137	}
earlz	0:217a7931b41f	138	}
earlz	0:217a7931b41f	139	}
earlz	0:217a7931b41f	140
earlz	0:217a7931b41f	141	void x86CPU::op16_lock(){ //0xF0 prefix
earlz	0:217a7931b41f	142	#ifndef X86_MULTITHREADING
earlz	0:217a7931b41f	143	if(IsLocked()==1){
earlz	0:217a7931b41f	144	eip--;
earlz	0:217a7931b41f	145	return;
earlz	0:217a7931b41f	146	}
earlz	0:217a7931b41f	147	#endif
earlz	0:217a7931b41f	148	Lock();
earlz	0:217a7931b41f	149	eip++;
earlz	0:217a7931b41f	150	(uint32_t)&op_cache=ReadDword(cCS,eip);
earlz	0:217a7931b41f	151	//Add strict opcode testing for 386+
earlz	0:217a7931b41f	152	(this->*Opcodes[op_cache[0]])();
earlz	0:217a7931b41f	153	Unlock();
earlz	0:217a7931b41f	154	}
earlz	0:217a7931b41f	155
earlz	0:217a7931b41f	156
earlz	0:217a7931b41f	157
earlz	0:217a7931b41f	158	void x86CPU::op16_cbw(){
earlz	0:217a7931b41f	159	if((*regs8[AL]&0x80)==0){
earlz	0:217a7931b41f	160	*regs8[AH]=0;
earlz	0:217a7931b41f	161	}else{
earlz	0:217a7931b41f	162	*regs8[AH]=0xFF;
earlz	0:217a7931b41f	163	}
earlz	0:217a7931b41f	164	}
earlz	0:217a7931b41f	165
earlz	0:217a7931b41f	166
earlz	0:217a7931b41f	167
earlz	0:217a7931b41f	168	void x86CPU::op16_cwd(){
earlz	0:217a7931b41f	169	if(*regs16[AX]>=0x8000){
earlz	0:217a7931b41f	170	*regs16[DX]=0xFFFF;
earlz	0:217a7931b41f	171	}else{
earlz	0:217a7931b41f	172	*regs16[DX]=0;
earlz	0:217a7931b41f	173	}
earlz	0:217a7931b41f	174	}
earlz	0:217a7931b41f	175
earlz	0:217a7931b41f	176	void x86CPU::op16_escape(){
earlz	0:217a7931b41f	177	/**This is for FPU escape opcodes
earlz	0:217a7931b41f	178	this uses 0xD8 to 0xDF
earlz	0:217a7931b41f	179	**/
earlz	0:217a7931b41f	180	Onx86LibError();
earlz	0:217a7931b41f	181	//throw CpuInt_excp(UNDEV_IEXCP); //throw unknown device exception
earlz	0:217a7931b41f	182	}
earlz	0:217a7931b41f	183	void x86CPU::op16_wait(){
earlz	0:217a7931b41f	184	/Does nothing.../
earlz	0:217a7931b41f	185	Onx86LibError();
earlz	0:217a7931b41f	186	//throw CpuInt_excp(UNDEV_IEXCP);
earlz	0:217a7931b41f	187	}
earlz	0:217a7931b41f	188
earlz	0:217a7931b41f	189
earlz	0:217a7931b41f	190
earlz	0:217a7931b41f	191	/so-called undocumented opcodes:/
earlz	0:217a7931b41f	192
earlz	0:217a7931b41f	193	/**salc -0xD6- this is will set al on carry -no arguments
earlz	0:217a7931b41f	194	log: if cf=0 then al=0 else al=FF
earlz	0:217a7931b41f	195	**/
earlz	0:217a7931b41f	196	void x86CPU::op16_salc(){ //set al on carry
earlz	0:217a7931b41f	197	if(freg.cf==0){*regs8[AL]=0;
earlz	0:217a7931b41f	198	}else{*regs8[AL]=0xFF;
earlz	0:217a7931b41f	199	}
earlz	0:217a7931b41f	200
earlz	0:217a7931b41f	201	}
earlz	0:217a7931b41f	202
earlz	0:217a7931b41f	203
earlz	0:217a7931b41f	204
earlz	0:217a7931b41f	205
earlz	0:217a7931b41f	206
earlz	0:217a7931b41f	207
earlz	0:217a7931b41f	208
earlz	0:217a7931b41f	209
earlz	0:217a7931b41f	210	};
earlz	0:217a7931b41f	211
earlz	0:217a7931b41f	212
earlz	0:217a7931b41f	213
earlz	0:217a7931b41f	214

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Type:	Library
Created:	04 Mar 2012
Imports:	8
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	3

ops/etc.cpp@0:217a7931b41f, 2012-03-04 (annotated)

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