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/flow.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	namespace x86Lib{
earlz	0:217a7931b41f	33	using namespace std;
earlz	0:217a7931b41f	34
earlz	0:217a7931b41f	35
earlz	0:217a7931b41f	36
earlz	0:217a7931b41f	37
earlz	0:217a7931b41f	38
earlz	0:217a7931b41f	39
earlz	0:217a7931b41f	40
earlz	0:217a7931b41f	41
earlz	0:217a7931b41f	42
earlz	0:217a7931b41f	43
earlz	0:217a7931b41f	44	void x86CPU::op16_jmp_rel8(){
earlz	0:217a7931b41f	45	eip++;
earlz	0:217a7931b41f	46	Jmp16_near8(op_cache[1]);
earlz	0:217a7931b41f	47	}
earlz	0:217a7931b41f	48
earlz	0:217a7931b41f	49	void x86CPU::op16_jmp_rel16(){
earlz	0:217a7931b41f	50	eip+=2; //get to last byte of address so jmp works right
earlz	0:217a7931b41f	51	Jmp16_near16((uint16_t)&op_cache[1]);
earlz	0:217a7931b41f	52	}
earlz	0:217a7931b41f	53
earlz	0:217a7931b41f	54	void x86CPU::op16_jmp_imm16_imm16(){ //far jmp
earlz	0:217a7931b41f	55	(uint32_t)&op_cache=ReadDword(cCS,eip+1);
earlz	0:217a7931b41f	56	seg[cCS]=(uint16_t)&op_cache[2]; //I always forget that they are reversed...
earlz	0:217a7931b41f	57	eip=(uint16_t)&op_cache[0];
earlz	0:217a7931b41f	58	eip--; //eip will be incremented in Cycle
earlz	0:217a7931b41f	59	}
earlz	0:217a7931b41f	60
earlz	0:217a7931b41f	61	void x86CPU::op16_jmp_rm16(ModRM16 &rm){
earlz	0:217a7931b41f	62	eip=rm.ReadWordr(); //absolute address...
earlz	0:217a7931b41f	63	eip--;
earlz	0:217a7931b41f	64	}
earlz	0:217a7931b41f	65
earlz	0:217a7931b41f	66	void x86CPU::op16_jmp_m16_m16(ModRM16 &rm){
earlz	0:217a7931b41f	67	(uint32_t)&op_cache=rm.ReadDword(); //quicker to use op_cache, than dynamic variables...
earlz	0:217a7931b41f	68	seg[cCS]=(uint16_t)&op_cache[2];
earlz	0:217a7931b41f	69	eip=(uint16_t)&op_cache[0];
earlz	0:217a7931b41f	70	eip--;
earlz	0:217a7931b41f	71	}
earlz	0:217a7931b41f	72
earlz	0:217a7931b41f	73
earlz	0:217a7931b41f	74
earlz	0:217a7931b41f	75	void x86CPU::op16_jcxz_rel8(){
earlz	0:217a7931b41f	76	if(*regs16[CX]==0){
earlz	0:217a7931b41f	77	Jmp16_near8(op_cache[1]);
earlz	0:217a7931b41f	78	}
earlz	0:217a7931b41f	79	}
earlz	0:217a7931b41f	80
earlz	0:217a7931b41f	81
earlz	0:217a7931b41f	82
earlz	0:217a7931b41f	83
earlz	0:217a7931b41f	84
earlz	0:217a7931b41f	85
earlz	0:217a7931b41f	86	void x86CPU::op16_call_rel16(){
earlz	0:217a7931b41f	87
earlz	0:217a7931b41f	88	Push16(eip+2);
earlz	0:217a7931b41f	89	if((uint16_t)&op_cache[1]<0x8000){
earlz	0:217a7931b41f	90	//eip++;
earlz	0:217a7931b41f	91	}
earlz	0:217a7931b41f	92	eip+=2;
earlz	0:217a7931b41f	93	Jmp16_near16((uint16_t)&op_cache[1]);
earlz	0:217a7931b41f	94	}
earlz	0:217a7931b41f	95	void x86CPU::op16_retn(){
earlz	0:217a7931b41f	96	eip=Pop16();
earlz	0:217a7931b41f	97	//eip--; //because in Cycle, we increment..
earlz	0:217a7931b41f	98	}
earlz	0:217a7931b41f	99
earlz	0:217a7931b41f	100	void x86CPU::op16_loop_rel8(){
earlz	0:217a7931b41f	101	(*regs16[CX])--;
earlz	0:217a7931b41f	102	eip++;
earlz	0:217a7931b41f	103	if(*regs16[CX]!=0){
earlz	0:217a7931b41f	104	Jmp16_near8(op_cache[1]);
earlz	0:217a7931b41f	105	}
earlz	0:217a7931b41f	106	}
earlz	0:217a7931b41f	107
earlz	0:217a7931b41f	108	void x86CPU::op16_loope_rel8(){
earlz	0:217a7931b41f	109	(*regs16[CX])--;
earlz	0:217a7931b41f	110	eip++;
earlz	0:217a7931b41f	111	if((*regs16[CX]!=0) && (freg.zf==1)){
earlz	0:217a7931b41f	112	Jmp16_near8(op_cache[1]);
earlz	0:217a7931b41f	113	}
earlz	0:217a7931b41f	114	}
earlz	0:217a7931b41f	115
earlz	0:217a7931b41f	116	void x86CPU::op16_loopne_rel8(){
earlz	0:217a7931b41f	117	(*regs16[CX])--;
earlz	0:217a7931b41f	118	eip++;
earlz	0:217a7931b41f	119	if((*regs16[CX]!=0) && (freg.zf==0)){
earlz	0:217a7931b41f	120	Jmp16_near8(op_cache[1]);
earlz	0:217a7931b41f	121	}
earlz	0:217a7931b41f	122	}
earlz	0:217a7931b41f	123
earlz	0:217a7931b41f	124
earlz	0:217a7931b41f	125	void x86CPU::op16_call_imm16_imm16(){ //far call
earlz	0:217a7931b41f	126	Push16(seg[cCS]);
earlz	0:217a7931b41f	127	Push16(eip+4);
earlz	0:217a7931b41f	128	(uint32_t)&op_cache=ReadDword(cCS,eip+1);
earlz	0:217a7931b41f	129	seg[cCS]=(uint16_t)&op_cache[2]; //I always forget that they are reversed...
earlz	0:217a7931b41f	130	eip=(uint16_t)&op_cache[0];
earlz	0:217a7931b41f	131	eip--; //eip will be incremented in Cycle
earlz	0:217a7931b41f	132	}
earlz	0:217a7931b41f	133
earlz	0:217a7931b41f	134	void x86CPU::op16_retf(){
earlz	0:217a7931b41f	135	eip=Pop16();
earlz	0:217a7931b41f	136	seg[cCS]=Pop16();
earlz	0:217a7931b41f	137	}
earlz	0:217a7931b41f	138
earlz	0:217a7931b41f	139	void x86CPU::op16_int_imm8(){
earlz	0:217a7931b41f	140	eip++;
earlz	0:217a7931b41f	141	Int16(op_cache[1]);
earlz	0:217a7931b41f	142	}
earlz	0:217a7931b41f	143
earlz	0:217a7931b41f	144	void x86CPU::op16_iret(){
earlz	0:217a7931b41f	145	eip=Pop16();
earlz	0:217a7931b41f	146	seg[cCS]=Pop16();
earlz	0:217a7931b41f	147	(uint16_t)&freg=Pop16();
earlz	0:217a7931b41f	148	}
earlz	0:217a7931b41f	149
earlz	0:217a7931b41f	150	void x86CPU::op16_int3(){
earlz	0:217a7931b41f	151	Int16(3);
earlz	0:217a7931b41f	152	}
earlz	0:217a7931b41f	153
earlz	0:217a7931b41f	154	void x86CPU::op16_into(){
earlz	0:217a7931b41f	155	if(freg.of==1){
earlz	0:217a7931b41f	156	Int16(4);
earlz	0:217a7931b41f	157	}
earlz	0:217a7931b41f	158	}
earlz	0:217a7931b41f	159	void x86CPU::op16_call_rm16(ModRM16 &rm){ //far call
earlz	0:217a7931b41f	160	Push16(eip+rm.GetLength()+1);
earlz	0:217a7931b41f	161	eip=rm.ReadWordr();
earlz	0:217a7931b41f	162	eip--; //eip will be incremented in Cycle
earlz	0:217a7931b41f	163	}
earlz	0:217a7931b41f	164
earlz	0:217a7931b41f	165	void x86CPU::op16_call_rm16_rm16(ModRM16 &rm){ //far call
earlz	0:217a7931b41f	166	Push16(seg[cCS]);
earlz	0:217a7931b41f	167	Push16(eip+rm.GetLength()+1);
earlz	0:217a7931b41f	168	(uint32_t)&op_cache=ReadDword(DS,rm.ReadDword());
earlz	0:217a7931b41f	169	seg[cCS]=(uint16_t)&op_cache[2]; //I always forget that they are reversed...
earlz	0:217a7931b41f	170	eip=(uint16_t)&op_cache[0];
earlz	0:217a7931b41f	171	eip--; //eip will be incremented in Cycle
earlz	0:217a7931b41f	172	}
earlz	0:217a7931b41f	173
earlz	0:217a7931b41f	174
earlz	0:217a7931b41f	175
earlz	0:217a7931b41f	176	};
earlz	0:217a7931b41f	177
earlz	0:217a7931b41f	178

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

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

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