Bochs/bochs/cpu/arith8.cc
Stanislav Shwartsman c026a90779 Unify coding style in CPU methods
NO AFFECT ON EMULATION RESULTS
2005-05-20 20:06:50 +00:00

550 lines
13 KiB
C++

/////////////////////////////////////////////////////////////////////////
// $Id: arith8.cc,v 1.36 2005-05-20 20:06:50 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#define LOG_THIS BX_CPU_THIS_PTR
void BX_CPU_C::ADD_EbGb(bxInstruction_c *i)
{
Bit8u op2, op1, sum;
op2 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op1 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
sum = op1 + op2;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), sum);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1);
sum = op1 + op2;
Write_RMW_virtual_byte(sum);
}
SET_FLAGS_OSZAPC_8(op1, op2, sum, BX_INSTR_ADD8);
}
void BX_CPU_C::ADD_GbEb(bxInstruction_c *i)
{
Bit8u op1, op2, sum;
op1 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op2 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
sum = op1 + op2;
}
else {
read_virtual_byte(i->seg(), RMAddr(i), &op2);
sum = op1 + op2;
}
BX_WRITE_8BIT_REGx(i->nnn(), i->extend8bitL(), sum);
SET_FLAGS_OSZAPC_8(op1, op2, sum, BX_INSTR_ADD8);
}
void BX_CPU_C::ADD_ALIb(bxInstruction_c *i)
{
Bit8u op1, op2, sum;
op1 = AL;
op2 = i->Ib();
sum = op1 + op2;
AL = sum;
SET_FLAGS_OSZAPC_8(op1, op2, sum, BX_INSTR_ADD8);
}
void BX_CPU_C::ADC_EbGb(bxInstruction_c *i)
{
Bit8u op2, op1, sum;
bx_bool temp_CF = getB_CF();
op2 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op1 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
sum = op1 + op2 + temp_CF;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), sum);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1);
sum = op1 + op2 + temp_CF;
Write_RMW_virtual_byte(sum);
}
SET_FLAGS_OSZAPC_8(op1, op2, sum,
(temp_CF) ? BX_INSTR_ADC8 : BX_INSTR_ADD8);
}
void BX_CPU_C::ADC_GbEb(bxInstruction_c *i)
{
Bit8u op1, op2, sum;
bx_bool temp_CF = getB_CF();
op1 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op2 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
}
else {
read_virtual_byte(i->seg(), RMAddr(i), &op2);
}
sum = op1 + op2 + temp_CF;
SET_FLAGS_OSZAPC_8(op1, op2, sum,
(temp_CF) ? BX_INSTR_ADC8 : BX_INSTR_ADD8);
BX_WRITE_8BIT_REGx(i->nnn(), i->extend8bitL(), sum);
}
void BX_CPU_C::ADC_ALIb(bxInstruction_c *i)
{
Bit8u op1, op2, sum;
bx_bool temp_CF = getB_CF();
op1 = AL;
op2 = i->Ib();
sum = op1 + op2 + temp_CF;
AL = sum;
SET_FLAGS_OSZAPC_8(op1, op2, sum,
(temp_CF) ? BX_INSTR_ADC8 : BX_INSTR_ADD8);
}
void BX_CPU_C::SBB_EbGb(bxInstruction_c *i)
{
Bit8u op2_8, op1_8, diff_8;
bx_bool temp_CF = getB_CF();
op2_8 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
diff_8 = op1_8 - (op2_8 + temp_CF);
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), diff_8);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1_8);
diff_8 = op1_8 - (op2_8 + temp_CF);
Write_RMW_virtual_byte(diff_8);
}
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8,
(temp_CF) ? BX_INSTR_SBB8 : BX_INSTR_SUB8);
}
void BX_CPU_C::SBB_GbEb(bxInstruction_c *i)
{
Bit8u op1_8, op2_8, diff_8;
bx_bool temp_CF = getB_CF();
op1_8 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op2_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
}
else {
read_virtual_byte(i->seg(), RMAddr(i), &op2_8);
}
diff_8 = op1_8 - (op2_8 + temp_CF);
BX_WRITE_8BIT_REGx(i->nnn(), i->extend8bitL(), diff_8);
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8,
(temp_CF) ? BX_INSTR_SBB8 : BX_INSTR_SUB8);
}
void BX_CPU_C::SBB_ALIb(bxInstruction_c *i)
{
Bit8u op1_8, op2_8, diff_8;
bx_bool temp_CF = getB_CF();
op1_8 = AL;
op2_8 = i->Ib();
diff_8 = op1_8 - (op2_8 + temp_CF);
AL = diff_8;
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8,
(temp_CF) ? BX_INSTR_SBB8 : BX_INSTR_SUB8);
}
void BX_CPU_C::SBB_EbIb(bxInstruction_c *i)
{
Bit8u op2_8, op1_8, diff_8;
bx_bool temp_CF = getB_CF();
op2_8 = i->Ib();
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
diff_8 = op1_8 - (op2_8 + temp_CF);
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), diff_8);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1_8);
diff_8 = op1_8 - (op2_8 + temp_CF);
Write_RMW_virtual_byte(diff_8);
}
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8,
(temp_CF) ? BX_INSTR_SBB8 : BX_INSTR_SUB8);
}
void BX_CPU_C::SUB_EbGb(bxInstruction_c *i)
{
Bit8u op2_8, op1_8, diff_8;
op2_8 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
diff_8 = op1_8 - op2_8;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), diff_8);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1_8);
diff_8 = op1_8 - op2_8;
Write_RMW_virtual_byte(diff_8);
}
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_SUB8);
}
void BX_CPU_C::SUB_GbEb(bxInstruction_c *i)
{
Bit8u op1_8, op2_8, diff_8;
op1_8 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op2_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
}
else {
read_virtual_byte(i->seg(), RMAddr(i), &op2_8);
}
diff_8 = op1_8 - op2_8;
BX_WRITE_8BIT_REGx(i->nnn(), i->extend8bitL(), diff_8);
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_SUB8);
}
void BX_CPU_C::SUB_ALIb(bxInstruction_c *i)
{
Bit8u op1_8, op2_8, diff_8;
op1_8 = AL;
op2_8 = i->Ib();
diff_8 = op1_8 - op2_8;
AL = diff_8;
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_SUB8);
}
void BX_CPU_C::CMP_EbGb(bxInstruction_c *i)
{
Bit8u op2_8, op1_8;
op2_8 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
}
else {
read_virtual_byte(i->seg(), RMAddr(i), &op1_8);
}
#if defined(BX_HostAsm_Cmp8)
Bit32u flags32;
asmCmp8(op1_8, op2_8, flags32);
setEFlagsOSZAPC(flags32);
#else
Bit8u diff_8 = op1_8 - op2_8;
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_COMPARE8);
#endif
}
void BX_CPU_C::CMP_GbEb(bxInstruction_c *i)
{
Bit8u op1_8, op2_8;
op1_8 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op2_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
}
else {
read_virtual_byte(i->seg(), RMAddr(i), &op2_8);
}
#if defined(BX_HostAsm_Cmp8)
Bit32u flags32;
asmCmp8(op1_8, op2_8, flags32);
setEFlagsOSZAPC(flags32);
#else
Bit8u diff_8 = op1_8 - op2_8;
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_COMPARE8);
#endif
}
void BX_CPU_C::CMP_ALIb(bxInstruction_c *i)
{
Bit8u op1_8 = AL;
Bit8u op2_8 = i->Ib();
#if defined(BX_HostAsm_Cmp8)
Bit32u flags32;
asmCmp8(op1_8, op2_8, flags32);
setEFlagsOSZAPC(flags32);
#else
Bit8u diff_8 = op1_8 - op2_8;
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_COMPARE8);
#endif
}
void BX_CPU_C::XADD_EbGb(bxInstruction_c *i)
{
#if (BX_CPU_LEVEL >= 4) || (BX_CPU_LEVEL_HACKED >= 4)
Bit8u op2, op1, sum;
/* XADD dst(r/m8), src(r8)
* temp <-- src + dst | sum = op2 + op1
* src <-- dst | op2 = op1
* dst <-- tmp | op1 = sum
*/
op2 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
op1 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
sum = op1 + op2;
// and write destination into source
// Note: if both op1 & op2 are registers, the last one written
// should be the sum, as op1 & op2 may be the same register.
// For example: XADD AL, AL
BX_WRITE_8BIT_REGx(i->nnn(), i->extend8bitL(), op1);
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), sum);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1);
sum = op1 + op2;
Write_RMW_virtual_byte(sum);
/* and write destination into source */
BX_WRITE_8BIT_REGx(i->nnn(), i->extend8bitL(), op1);
}
SET_FLAGS_OSZAPC_8(op1, op2, sum, BX_INSTR_ADD8);
#else
BX_INFO(("XADD_EbGb: not supported on < 80486"));
UndefinedOpcode(i);
#endif
}
void BX_CPU_C::ADD_EbIb(bxInstruction_c *i)
{
Bit8u op2, op1, sum;
op2 = i->Ib();
if (i->modC0()) {
op1 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
sum = op1 + op2;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), sum);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1);
sum = op1 + op2;
Write_RMW_virtual_byte(sum);
}
SET_FLAGS_OSZAPC_8(op1, op2, sum, BX_INSTR_ADD8);
}
void BX_CPU_C::ADC_EbIb(bxInstruction_c *i)
{
Bit8u op2, op1, sum;
bx_bool temp_CF = getB_CF();
op2 = i->Ib();
if (i->modC0()) {
op1 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
sum = op1 + op2 + temp_CF;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), sum);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1);
sum = op1 + op2 + temp_CF;
Write_RMW_virtual_byte(sum);
}
SET_FLAGS_OSZAPC_8(op1, op2, sum,
(temp_CF) ? BX_INSTR_ADC8 : BX_INSTR_ADD8);
}
void BX_CPU_C::SUB_EbIb(bxInstruction_c *i)
{
Bit8u op2_8, op1_8, diff_8;
op2_8 = i->Ib();
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
diff_8 = op1_8 - op2_8;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), diff_8);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1_8);
diff_8 = op1_8 - op2_8;
Write_RMW_virtual_byte(diff_8);
}
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_SUB8);
}
void BX_CPU_C::CMP_EbIb(bxInstruction_c *i)
{
Bit8u op2_8, op1_8;
op2_8 = i->Ib();
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
}
else {
read_virtual_byte(i->seg(), RMAddr(i), &op1_8);
}
#if defined(BX_HostAsm_Cmp8)
Bit32u flags32;
asmCmp8(op1_8, op2_8, flags32);
setEFlagsOSZAPC(flags32);
#else
Bit8u diff_8 = op1_8 - op2_8;
SET_FLAGS_OSZAPC_8(op1_8, op2_8, diff_8, BX_INSTR_COMPARE8);
#endif
}
void BX_CPU_C::NEG_Eb(bxInstruction_c *i)
{
Bit8u op1_8, diff_8;
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
diff_8 = -op1_8;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), diff_8);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1_8);
diff_8 = -op1_8;
Write_RMW_virtual_byte(diff_8);
}
SET_FLAGS_OSZAPC_RESULT_8(diff_8, BX_INSTR_NEG8);
}
void BX_CPU_C::INC_Eb(bxInstruction_c *i)
{
Bit8u op1;
if (i->modC0()) {
op1 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
op1++;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), op1);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1);
op1++;
Write_RMW_virtual_byte(op1);
}
SET_FLAGS_OSZAP_RESULT_8(op1, BX_INSTR_INC8);
}
void BX_CPU_C::DEC_Eb(bxInstruction_c *i)
{
Bit8u op1_8;
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
op1_8--;
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), op1_8);
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1_8);
op1_8--;
Write_RMW_virtual_byte(op1_8);
}
SET_FLAGS_OSZAP_RESULT_8(op1_8, BX_INSTR_DEC8);
}
void BX_CPU_C::CMPXCHG_EbGb(bxInstruction_c *i)
{
#if (BX_CPU_LEVEL >= 4) || (BX_CPU_LEVEL_HACKED >= 4)
Bit8u op2_8, op1_8, diff_8;
if (i->modC0()) {
op1_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
}
else {
read_RMW_virtual_byte(i->seg(), RMAddr(i), &op1_8);
}
diff_8 = AL - op1_8;
SET_FLAGS_OSZAPC_8(AL, op1_8, diff_8, BX_INSTR_COMPARE8);
if (diff_8 == 0) { // if accumulator == dest
// dest <-- src
op2_8 = BX_READ_8BIT_REGx(i->nnn(),i->extend8bitL());
if (i->modC0()) {
BX_WRITE_8BIT_REGx(i->rm(), i->extend8bitL(), op2_8);
}
else {
Write_RMW_virtual_byte(op2_8);
}
}
else {
// accumulator <-- dest
AL = op1_8;
}
#else
BX_INFO(("CMPXCHG_EbGb: not supported for cpulevel <= 3"));
UndefinedOpcode(i);
#endif
}