279 lines
7.2 KiB
C++
279 lines
7.2 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: data_xfer16.cc,v 1.35 2005-09-23 16:45:41 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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void BX_CPU_C::MOV_RXIw(bxInstruction_c *i)
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{
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BX_WRITE_16BIT_REG(i->opcodeReg(), i->Iw());
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}
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void BX_CPU_C::XCHG_RXAX(bxInstruction_c *i)
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{
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Bit16u temp16 = AX;
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AX = BX_READ_16BIT_REG(i->opcodeReg());
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BX_WRITE_16BIT_REG(i->opcodeReg(), temp16);
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}
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void BX_CPU_C::MOV_EEwGw(bxInstruction_c *i)
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{
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write_virtual_word(i->seg(), RMAddr(i), &BX_READ_16BIT_REG(i->nnn()));
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}
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void BX_CPU_C::MOV_EGwGw(bxInstruction_c *i)
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{
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Bit16u op2_16 = BX_READ_16BIT_REG(i->nnn());
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BX_WRITE_16BIT_REG(i->rm(), op2_16);
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}
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void BX_CPU_C::MOV_GwEGw(bxInstruction_c *i)
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{
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// 2nd modRM operand Ex, is known to be a general register Gw.
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Bit16u op2_16 = BX_READ_16BIT_REG(i->rm());
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BX_WRITE_16BIT_REG(i->nnn(), op2_16);
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}
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void BX_CPU_C::MOV_GwEEw(bxInstruction_c *i)
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{
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// 2nd modRM operand Ex, is known to be a memory operand, Ew.
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read_virtual_word(i->seg(), RMAddr(i), &BX_READ_16BIT_REG(i->nnn()));
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}
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void BX_CPU_C::MOV_EwSw(bxInstruction_c *i)
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{
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#if BX_CPU_LEVEL < 3
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BX_PANIC(("MOV_EwSw: incomplete for CPU < 3"));
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#endif
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/* Illegal to use nonexisting segments */
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if (i->nnn() >= 6) {
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BX_INFO(("MOV_EwSw: using of nonexisting segment register"));
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UndefinedOpcode(i);
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}
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Bit16u seg_reg = BX_CPU_THIS_PTR sregs[i->nnn()].selector.value;
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if (i->modC0()) {
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if ( i->os32L() ) {
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BX_WRITE_32BIT_REGZ(i->rm(), seg_reg);
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}
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else {
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BX_WRITE_16BIT_REG(i->rm(), seg_reg);
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}
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}
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else {
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write_virtual_word(i->seg(), RMAddr(i), &seg_reg);
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}
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}
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void BX_CPU_C::MOV_SwEw(bxInstruction_c *i)
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{
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#if BX_CPU_LEVEL < 3
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BX_PANIC(("MOV_SwEw: incomplete for CPU < 3"));
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#endif
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Bit16u op2_16;
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/* If attempt is made to load the CS register ... */
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if (i->nnn() == BX_SEG_REG_CS) {
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UndefinedOpcode(i);
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}
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/* Illegal to use nonexisting segments */
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if (i->nnn() >= 6) {
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BX_INFO(("MOV_EwSw: using of nonexisting segment register"));
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UndefinedOpcode(i);
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}
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if (i->modC0()) {
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op2_16 = BX_READ_16BIT_REG(i->rm());
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}
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else {
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read_virtual_word(i->seg(), RMAddr(i), &op2_16);
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}
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load_seg_reg(&BX_CPU_THIS_PTR sregs[i->nnn()], op2_16);
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if (i->nnn() == BX_SEG_REG_SS) {
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// MOV SS inhibits interrupts, debug exceptions and single-step
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// trap exceptions until the execution boundary following the
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// next instruction is reached.
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// Same code as POP_SS()
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BX_CPU_THIS_PTR inhibit_mask |=
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BX_INHIBIT_INTERRUPTS | BX_INHIBIT_DEBUG;
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BX_CPU_THIS_PTR async_event = 1;
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}
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}
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void BX_CPU_C::LEA_GwM(bxInstruction_c *i)
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{
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if (i->modC0()) {
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BX_INFO(("LEA_GwM: op2 is a register"));
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UndefinedOpcode(i);
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}
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BX_WRITE_16BIT_REG(i->nnn(), (Bit16u) RMAddr(i));
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}
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void BX_CPU_C::MOV_AXOw(bxInstruction_c *i)
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{
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read_virtual_word(i->seg(), i->Id(), &AX);
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}
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void BX_CPU_C::MOV_OwAX(bxInstruction_c *i)
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{
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write_virtual_word(i->seg(), i->Id(), &AX);
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}
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void BX_CPU_C::MOV_EwIw(bxInstruction_c *i)
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{
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Bit16u op2_16 = i->Iw();
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/* now write sum back to destination */
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if (i->modC0()) {
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BX_WRITE_16BIT_REG(i->rm(), op2_16);
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}
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else {
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write_virtual_word(i->seg(), RMAddr(i), &op2_16);
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}
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}
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#if BX_CPU_LEVEL >= 3
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void BX_CPU_C::MOVZX_GwEb(bxInstruction_c *i)
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{
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Bit8u op2_8;
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if (i->modC0()) {
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op2_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
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}
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else {
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/* pointer, segment address pair */
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read_virtual_byte(i->seg(), RMAddr(i), &op2_8);
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}
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/* zero extend byte op2 into word op1 */
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BX_WRITE_16BIT_REG(i->nnn(), (Bit16u) op2_8);
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}
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void BX_CPU_C::MOVSX_GwEb(bxInstruction_c *i)
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{
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Bit8u op2_8;
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if (i->modC0()) {
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op2_8 = BX_READ_8BIT_REGx(i->rm(),i->extend8bitL());
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}
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else {
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/* pointer, segment address pair */
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read_virtual_byte(i->seg(), RMAddr(i), &op2_8);
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}
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/* sign extend byte op2 into word op1 */
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BX_WRITE_16BIT_REG(i->nnn(), (Bit8s) op2_8);
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}
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#endif
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void BX_CPU_C::XCHG_EwGw(bxInstruction_c *i)
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{
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Bit16u op2_16, op1_16;
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#if BX_DEBUGGER && BX_MAGIC_BREAKPOINT
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// (mch) Magic break point
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// Note for mortals: the instruction to trigger this is "xchgw %bx,%bx"
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if (i->nnn() == 3 && i->modC0() && i->rm() == 3)
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{
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BX_CPU_THIS_PTR magic_break = 1;
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}
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#endif
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op2_16 = BX_READ_16BIT_REG(i->nnn());
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/* op1_16 is a register or memory reference */
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if (i->modC0()) {
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op1_16 = BX_READ_16BIT_REG(i->rm());
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BX_WRITE_16BIT_REG(i->rm(), op2_16);
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_word(i->seg(), RMAddr(i), &op1_16);
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Write_RMW_virtual_word(op2_16);
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}
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BX_WRITE_16BIT_REG(i->nnn(), op1_16);
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}
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void BX_CPU_C::CMOV_GwEw(bxInstruction_c *i)
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{
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#if (BX_CPU_LEVEL >= 6) || (BX_CPU_LEVEL_HACKED >= 6)
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// Note: CMOV accesses a memory source operand (read), regardless
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// of whether condition is true or not. Thus, exceptions may
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// occur even if the MOV does not take place.
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bx_bool condition = 0;
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Bit16u op2_16;
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switch (i->b1()) {
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// CMOV opcodes:
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case 0x140: condition = get_OF(); break;
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case 0x141: condition = !get_OF(); break;
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case 0x142: condition = get_CF(); break;
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case 0x143: condition = !get_CF(); break;
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case 0x144: condition = get_ZF(); break;
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case 0x145: condition = !get_ZF(); break;
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case 0x146: condition = get_CF() || get_ZF(); break;
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case 0x147: condition = !get_CF() && !get_ZF(); break;
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case 0x148: condition = get_SF(); break;
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case 0x149: condition = !get_SF(); break;
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case 0x14A: condition = get_PF(); break;
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case 0x14B: condition = !get_PF(); break;
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case 0x14C: condition = getB_SF() != getB_OF(); break;
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case 0x14D: condition = getB_SF() == getB_OF(); break;
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case 0x14E: condition = get_ZF() || (getB_SF() != getB_OF()); break;
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case 0x14F: condition = !get_ZF() && (getB_SF() == getB_OF()); break;
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default:
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BX_PANIC(("CMOV_GwEw: default case"));
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}
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if (i->modC0()) {
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op2_16 = BX_READ_16BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_virtual_word(i->seg(), RMAddr(i), &op2_16);
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}
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if (condition) {
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BX_WRITE_16BIT_REG(i->nnn(), op2_16);
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}
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#else
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BX_INFO(("CMOV_GwEw: required P6 support, use --enable-cpu-level=6 option"));
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UndefinedOpcode(i);
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#endif
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}
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