support.h

DOSBox emulates a full x86 pc with sound and dos. Its main use is to run old dosgames on platforms w

/*
 *  Copyright (C) 2002-2007  The DOSBox Team
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */


#define LoadMbs(off) (Bit8s)(LoadMb(off))
#define LoadMws(off) (Bit16s)(LoadMw(off))
#define LoadMds(off) (Bit32s)(LoadMd(off))

#define LoadRb(reg) reg
#define LoadRw(reg) reg
#define LoadRd(reg) reg

#define SaveRb(reg,val)	reg=val
#define SaveRw(reg,val)	reg=val
#define SaveRd(reg,val)	reg=val

static INLINE Bit8s Fetchbs() {
	return Fetchb();
}
static INLINE Bit16s Fetchws() {
	return Fetchw();
}

static INLINE Bit32s Fetchds() {
	return Fetchd();
}


#define RUNEXCEPTION() {										\
	FillFlags();												\
	CPU_Exception(cpu.exception.which,cpu.exception.error);		\
	continue;													\
}

#define EXCEPTION(blah)										\
	{														\
		CPU_Exception(blah);								\
		continue;											\
	}

//TODO Could probably make all byte operands fast?
#define JumpCond16_b(COND) {						\
	SAVEIP;											\
	if (COND) reg_ip+=Fetchbs();					\
	reg_ip+=1;										\
	continue;										\
}

#define JumpCond16_w(COND) {						\
	SAVEIP;											\
	if (COND) reg_ip+=Fetchws();					\
	reg_ip+=2;										\
	continue;										\
}

#define JumpCond32_b(COND) {						\
	SAVEIP;											\
	if (COND) reg_eip+=Fetchbs();					\
	reg_eip+=1;										\
	continue;										\
}

#define JumpCond32_d(COND) {						\
	SAVEIP;											\
	if (COND) reg_eip+=Fetchds();					\
	reg_eip+=4;										\
	continue;										\
}


#define SETcc(cc)											\
	{														\
		GetRM;												\
		if (rm >= 0xc0 ) {GetEArb;*earb=(cc) ? 1 : 0;}		\
		else {GetEAa;SaveMb(eaa,(cc) ? 1 : 0);}				\
	}

#include "helpers.h"
#include "table_ea.h"
#include "../modrm.h"