src/cpu/core_normal/support.h

/*
 *  Copyright (C) 2002-2020  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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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=((Bit8u)(val))
#define SaveRw(reg,val) reg=((Bit16u)(val))
#define SaveRd(reg,val) reg=((Bit32u)(val))

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

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


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

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

/* NTS: At first glance, this looks like code that will only fetch the delta for conditional jumps
 *      if the condition is true. Further examination shows that DOSBox's core has two different
 *      CS:IP variables, reg_ip and core.cseip which Fetchb() modifies. */
//TODO Could probably make all byte operands fast?
#define JumpCond16_b(COND) {                                            \
        const Bit32u adj=(Bit32u)Fetchbs();                                             \
        SAVEIP;                                                         \
        if (COND) reg_ip+=adj;                                          \
        continue;                                                       \
}

#define JumpCond16_w(COND) {                                            \
        const Bit32u adj=(Bit32u)Fetchws();                                             \
        SAVEIP;                                                         \
        if (COND) reg_ip+=adj;                                          \
        continue;                                                       \
}

#define JumpCond32_b(COND) {                                            \
        const Bit32u adj=(Bit32u)Fetchbs();                                             \
        SAVEIP;                                                         \
        if (COND) reg_eip+=adj;                                         \
        continue;                                                       \
}

#define JumpCond32_d(COND) {                                            \
        const Bit32u adj=(Bit32u)Fetchds();                                             \
        SAVEIP;                                                         \
        if (COND) reg_eip+=adj;                                         \
        continue;                                                       \
}

#define MoveCond16(COND) {                                                      \
        GetRMrw;                                                                                \
        if (rm >= 0xc0 ) {GetEArw; if (COND) *rmrw=*earw;}\
        else {GetEAa; if (COND) *rmrw=LoadMw(eaa);}             \
}

#define MoveCond32(COND) {                                                      \
        GetRMrd;                                                                                \
        if (rm >= 0xc0 ) {GetEArd; if (COND) *rmrd=*eard;}\
        else {GetEAa; if (COND) *rmrd=LoadMd(eaa);}             \
}

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

#include "helpers.h"
#if CPU_CORE <= CPU_ARCHTYPE_8086
# include "table_ea_8086.h"
#else
# include "table_ea.h"
#endif
#include "../modrm.h"