767 lines
16 KiB
C++
767 lines
16 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: arith32.cc,v 1.44 2005-04-02 18:49:44 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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#if BX_SUPPORT_X86_64==0
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// Make life easier for merging cpu64 and cpu code.
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#define RAX EAX
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#define RDX EDX
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#endif
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void
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BX_CPU_C::INC_ERX(bxInstruction_c *i)
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{
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unsigned opcodeReg = i->opcodeReg();
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#if defined(BX_HostAsm_Inc32)
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Bit32u flags32;
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asmInc32(BX_CPU_THIS_PTR gen_reg[opcodeReg].dword.erx, flags32);
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setEFlagsOSZAP(flags32);
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#else
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Bit32u erx = ++ BX_CPU_THIS_PTR gen_reg[opcodeReg].dword.erx;
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SET_FLAGS_OSZAP_RESULT_32(erx, BX_INSTR_INC32);
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#endif
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BX_CLEAR_64BIT_HIGH(opcodeReg);
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}
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void
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BX_CPU_C::DEC_ERX(bxInstruction_c *i)
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{
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unsigned opcodeReg = i->opcodeReg();
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#if defined(BX_HostAsm_Dec32)
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Bit32u flags32;
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asmDec32(BX_CPU_THIS_PTR gen_reg[opcodeReg].dword.erx, flags32);
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setEFlagsOSZAP(flags32);
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#else
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Bit32u erx = -- BX_CPU_THIS_PTR gen_reg[opcodeReg].dword.erx;
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SET_FLAGS_OSZAP_RESULT_32(erx, BX_INSTR_DEC32);
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#endif
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BX_CLEAR_64BIT_HIGH(opcodeReg);
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}
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void
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BX_CPU_C::ADD_EdGd(bxInstruction_c *i)
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{
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Bit32u op2_32, op1_32, sum_32;
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op2_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op1_32 = BX_READ_32BIT_REG(i->rm());
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sum_32 = op1_32 + op2_32;
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BX_WRITE_32BIT_REGZ(i->rm(), sum_32);
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}
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else {
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read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
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sum_32 = op1_32 + op2_32;
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Write_RMW_virtual_dword(sum_32);
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}
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32, BX_INSTR_ADD32);
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}
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void
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BX_CPU_C::ADD_GdEEd(bxInstruction_c *i)
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{
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Bit32u op1_32, op2_32, sum_32;
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unsigned nnn = i->nnn();
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op1_32 = BX_READ_32BIT_REG(nnn);
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read_virtual_dword(i->seg(), RMAddr(i), &op2_32);
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#if defined(BX_HostAsm_Add32)
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Bit32u flags32;
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asmAdd32(sum_32, op1_32, op2_32, flags32);
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setEFlagsOSZAPC(flags32);
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#else
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sum_32 = op1_32 + op2_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32, BX_INSTR_ADD32);
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#endif
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BX_WRITE_32BIT_REGZ(nnn, sum_32);
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}
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void
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BX_CPU_C::ADD_GdEGd(bxInstruction_c *i)
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{
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Bit32u op1_32, op2_32, sum_32;
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unsigned nnn = i->nnn();
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op1_32 = BX_READ_32BIT_REG(nnn);
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op2_32 = BX_READ_32BIT_REG(i->rm());
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#if defined(BX_HostAsm_Add32)
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Bit32u flags32;
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asmAdd32(sum_32, op1_32, op2_32, flags32);
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setEFlagsOSZAPC(flags32);
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#else
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sum_32 = op1_32 + op2_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32, BX_INSTR_ADD32);
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#endif
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BX_WRITE_32BIT_REGZ(nnn, sum_32);
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}
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void
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BX_CPU_C::ADD_EAXId(bxInstruction_c *i)
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{
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Bit32u op1_32, op2_32, sum_32;
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op1_32 = EAX;
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op2_32 = i->Id();
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sum_32 = op1_32 + op2_32;
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RAX = sum_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32, BX_INSTR_ADD32);
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}
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void
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BX_CPU_C::ADC_EdGd(bxInstruction_c *i)
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{
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bx_bool temp_CF = getB_CF();
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Bit32u op2_32, op1_32, sum_32;
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op2_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op1_32 = BX_READ_32BIT_REG(i->rm());
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sum_32 = op1_32 + op2_32 + temp_CF;
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BX_WRITE_32BIT_REGZ(i->rm(), sum_32);
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}
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else {
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read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
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sum_32 = op1_32 + op2_32 + temp_CF;
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Write_RMW_virtual_dword(sum_32);
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}
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32,
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(temp_CF) ? BX_INSTR_ADC32 : BX_INSTR_ADD32);
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}
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void
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BX_CPU_C::ADC_GdEd(bxInstruction_c *i)
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{
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bx_bool temp_CF = getB_CF();
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Bit32u op1_32, op2_32, sum_32;
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op1_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op2_32 = BX_READ_32BIT_REG(i->rm());
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}
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else {
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read_virtual_dword(i->seg(), RMAddr(i), &op2_32);
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}
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sum_32 = op1_32 + op2_32 + temp_CF;
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BX_WRITE_32BIT_REGZ(i->nnn(), sum_32);
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32,
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(temp_CF) ? BX_INSTR_ADC32 : BX_INSTR_ADD32);
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}
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void
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BX_CPU_C::ADC_EAXId(bxInstruction_c *i)
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{
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bx_bool temp_CF = getB_CF();
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Bit32u op1_32, op2_32, sum_32;
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op1_32 = EAX;
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op2_32 = i->Id();
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sum_32 = op1_32 + op2_32 + temp_CF;
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RAX = sum_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32,
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(temp_CF) ? BX_INSTR_ADC32 : BX_INSTR_ADD32);
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}
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void
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BX_CPU_C::SBB_EdGd(bxInstruction_c *i)
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{
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bx_bool temp_CF = getB_CF();
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Bit32u op2_32, op1_32, diff_32;
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op2_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op1_32 = BX_READ_32BIT_REG(i->rm());
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diff_32 = op1_32 - (op2_32 + temp_CF);
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BX_WRITE_32BIT_REGZ(i->rm(), diff_32);
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}
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else {
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read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
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diff_32 = op1_32 - (op2_32 + temp_CF);
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Write_RMW_virtual_dword(diff_32);
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}
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32,
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(temp_CF) ? BX_INSTR_SBB32 : BX_INSTR_SUB32);
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}
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void
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BX_CPU_C::SBB_GdEd(bxInstruction_c *i)
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{
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bx_bool temp_CF = getB_CF();
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Bit32u op1_32, op2_32, diff_32;
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op1_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op2_32 = BX_READ_32BIT_REG(i->rm());
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}
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else {
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read_virtual_dword(i->seg(), RMAddr(i), &op2_32);
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}
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diff_32 = op1_32 - (op2_32 + temp_CF);
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BX_WRITE_32BIT_REGZ(i->nnn(), diff_32);
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32,
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(temp_CF) ? BX_INSTR_SBB32 : BX_INSTR_SUB32);
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}
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void
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BX_CPU_C::SBB_EAXId(bxInstruction_c *i)
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{
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bx_bool temp_CF = getB_CF();
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Bit32u op1_32, op2_32, diff_32;
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op1_32 = EAX;
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op2_32 = i->Id();
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diff_32 = op1_32 - (op2_32 + temp_CF);
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RAX = diff_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32,
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(temp_CF) ? BX_INSTR_SBB32 : BX_INSTR_SUB32);
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}
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void
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BX_CPU_C::SBB_EdId(bxInstruction_c *i)
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{
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bx_bool temp_CF = getB_CF();
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Bit32u op2_32, op1_32, diff_32;
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op2_32 = i->Id();
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if (i->modC0()) {
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op1_32 = BX_READ_32BIT_REG(i->rm());
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diff_32 = op1_32 - (op2_32 + temp_CF);
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BX_WRITE_32BIT_REGZ(i->rm(), diff_32);
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}
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else {
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read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
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diff_32 = op1_32 - (op2_32 + temp_CF);
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Write_RMW_virtual_dword(diff_32);
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}
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32,
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(temp_CF) ? BX_INSTR_SBB32 : BX_INSTR_SUB32);
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}
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void
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BX_CPU_C::SUB_EdGd(bxInstruction_c *i)
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{
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Bit32u op2_32, op1_32, diff_32;
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op2_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op1_32 = BX_READ_32BIT_REG(i->rm());
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diff_32 = op1_32 - op2_32;
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BX_WRITE_32BIT_REGZ(i->rm(), diff_32);
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}
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else {
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read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
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diff_32 = op1_32 - op2_32;
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Write_RMW_virtual_dword(diff_32);
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}
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_SUB32);
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}
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void
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BX_CPU_C::SUB_GdEd(bxInstruction_c *i)
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{
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Bit32u op1_32, op2_32, diff_32;
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unsigned nnn = i->nnn();
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op1_32 = BX_READ_32BIT_REG(nnn);
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if (i->modC0()) {
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op2_32 = BX_READ_32BIT_REG(i->rm());
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}
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else {
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read_virtual_dword(i->seg(), RMAddr(i), &op2_32);
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}
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#if defined(BX_HostAsm_Sub32)
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Bit32u flags32;
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asmSub32(diff_32, op1_32, op2_32, flags32);
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setEFlagsOSZAPC(flags32);
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#else
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diff_32 = op1_32 - op2_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_SUB32);
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#endif
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BX_WRITE_32BIT_REGZ(nnn, diff_32);
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}
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void
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BX_CPU_C::SUB_EAXId(bxInstruction_c *i)
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{
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Bit32u op1_32, op2_32, diff_32;
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op1_32 = EAX;
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op2_32 = i->Id();
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diff_32 = op1_32 - op2_32;
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RAX = diff_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_SUB32);
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}
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void
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BX_CPU_C::CMP_EdGd(bxInstruction_c *i)
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{
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Bit32u op2_32, op1_32;
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op2_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op1_32 = BX_READ_32BIT_REG(i->rm());
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}
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else {
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read_virtual_dword(i->seg(), RMAddr(i), &op1_32);
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}
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#if defined(BX_HostAsm_Cmp32)
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Bit32u flags32;
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asmCmp32(op1_32, op2_32, flags32);
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setEFlagsOSZAPC(flags32);
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#else
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Bit32u diff_32 = op1_32 - op2_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_COMPARE32);
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#endif
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}
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void
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BX_CPU_C::CMP_GdEd(bxInstruction_c *i)
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{
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Bit32u op1_32, op2_32;
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op1_32 = BX_READ_32BIT_REG(i->nnn());
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if (i->modC0()) {
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op2_32 = BX_READ_32BIT_REG(i->rm());
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}
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else {
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read_virtual_dword(i->seg(), RMAddr(i), &op2_32);
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}
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#if defined(BX_HostAsm_Cmp32)
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Bit32u flags32;
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asmCmp32(op1_32, op2_32, flags32);
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setEFlagsOSZAPC(flags32);
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#else
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Bit32u diff_32 = op1_32 - op2_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_COMPARE32);
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#endif
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}
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void
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BX_CPU_C::CMP_EAXId(bxInstruction_c *i)
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{
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Bit32u op1_32, op2_32;
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op1_32 = EAX;
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op2_32 = i->Id();
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#if defined(BX_HostAsm_Cmp32)
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Bit32u flags32;
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asmCmp32(op1_32, op2_32, flags32);
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setEFlagsOSZAPC(flags32);
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#else
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Bit32u diff_32 = op1_32 - op2_32;
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SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_COMPARE32);
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#endif
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}
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void
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BX_CPU_C::CWDE(bxInstruction_c *i)
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{
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/* CBW: no flags are effected */
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RAX = (Bit16s) AX;
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}
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void
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BX_CPU_C::CDQ(bxInstruction_c *i)
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{
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/* CDQ: no flags are affected */
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if (EAX & 0x80000000) {
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RDX = 0xFFFFFFFF;
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}
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else {
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RDX = 0x00000000;
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}
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}
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// Some info on the opcodes at {0F,A6} and {0F,A7}
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// On 386 steps A0-B0:
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// {OF,A6} = XBTS
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// {OF,A7} = IBTS
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// On 486 steps A0-B0:
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// {OF,A6} = CMPXCHG 8
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// {OF,A7} = CMPXCHG 16|32
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//
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// On 486 >= B steps, and further processors, the
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// CMPXCHG instructions were moved to opcodes:
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// {OF,B0} = CMPXCHG 8
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// {OF,B1} = CMPXCHG 16|32
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void
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BX_CPU_C::CMPXCHG_XBTS(bxInstruction_c *i)
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{
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BX_INFO(("CMPXCHG_XBTS:"));
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UndefinedOpcode(i);
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}
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void
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BX_CPU_C::CMPXCHG_IBTS(bxInstruction_c *i)
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{
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BX_INFO(("CMPXCHG_IBTS:"));
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UndefinedOpcode(i);
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}
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void
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BX_CPU_C::XADD_EdGd(bxInstruction_c *i)
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{
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#if (BX_CPU_LEVEL >= 4) || (BX_CPU_LEVEL_HACKED >= 4)
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Bit32u op2_32, op1_32, sum_32;
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/* XADD dst(r/m), src(r)
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* temp <-- src + dst | sum = op2 + op1
|
|
* src <-- dst | op2 = op1
|
|
* dst <-- tmp | op1 = sum
|
|
*/
|
|
|
|
op2_32 = BX_READ_32BIT_REG(i->nnn());
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
sum_32 = op1_32 + op2_32;
|
|
// 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_32BIT_REGZ(i->nnn(), op1_32);
|
|
BX_WRITE_32BIT_REGZ(i->rm(), sum_32);
|
|
}
|
|
else {
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
sum_32 = op1_32 + op2_32;
|
|
Write_RMW_virtual_dword(sum_32);
|
|
/* and write destination into source */
|
|
BX_WRITE_32BIT_REGZ(i->nnn(), op1_32);
|
|
}
|
|
|
|
SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32, BX_INSTR_ADD32);
|
|
#else
|
|
BX_INFO (("XADD_EdGd not supported for cpulevel <= 3"));
|
|
UndefinedOpcode(i);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::ADD_EEdId(bxInstruction_c *i)
|
|
{
|
|
Bit32u op2_32, op1_32, sum_32;
|
|
|
|
op2_32 = i->Id();
|
|
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
|
|
#if defined(BX_HostAsm_Add32)
|
|
Bit32u flags32;
|
|
asmAdd32(sum_32, op1_32, op2_32, flags32);
|
|
setEFlagsOSZAPC(flags32);
|
|
#else
|
|
sum_32 = op1_32 + op2_32;
|
|
SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32, BX_INSTR_ADD32);
|
|
#endif
|
|
|
|
Write_RMW_virtual_dword(sum_32);
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::ADD_EGdId(bxInstruction_c *i)
|
|
{
|
|
Bit32u op2_32, op1_32, sum_32;
|
|
|
|
op2_32 = i->Id();
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
|
|
#if defined(BX_HostAsm_Add32)
|
|
Bit32u flags32;
|
|
asmAdd32(sum_32, op1_32, op2_32, flags32);
|
|
setEFlagsOSZAPC(flags32);
|
|
#else
|
|
sum_32 = op1_32 + op2_32;
|
|
SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32, BX_INSTR_ADD32);
|
|
#endif
|
|
|
|
BX_WRITE_32BIT_REGZ(i->rm(), sum_32);
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::ADC_EdId(bxInstruction_c *i)
|
|
{
|
|
bx_bool temp_CF = getB_CF();
|
|
|
|
Bit32u op2_32, op1_32, sum_32;
|
|
|
|
op2_32 = i->Id();
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
sum_32 = op1_32 + op2_32 + temp_CF;
|
|
BX_WRITE_32BIT_REGZ(i->rm(), sum_32);
|
|
}
|
|
else {
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
sum_32 = op1_32 + op2_32 + temp_CF;
|
|
Write_RMW_virtual_dword(sum_32);
|
|
}
|
|
|
|
SET_FLAGS_OSZAPC_32(op1_32, op2_32, sum_32,
|
|
(temp_CF) ? BX_INSTR_ADC32 : BX_INSTR_ADD32);
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::SUB_EdId(bxInstruction_c *i)
|
|
{
|
|
Bit32u op2_32, op1_32, diff_32;
|
|
|
|
op2_32 = i->Id();
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
diff_32 = op1_32 - op2_32;
|
|
BX_WRITE_32BIT_REGZ(i->rm(), diff_32);
|
|
}
|
|
else {
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
diff_32 = op1_32 - op2_32;
|
|
Write_RMW_virtual_dword(diff_32);
|
|
}
|
|
|
|
SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_SUB32);
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::CMP_EdId(bxInstruction_c *i)
|
|
{
|
|
Bit32u op2_32, op1_32;
|
|
|
|
op2_32 = i->Id();
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
}
|
|
else {
|
|
read_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
}
|
|
|
|
#if defined(BX_HostAsm_Cmp32)
|
|
Bit32u flags32;
|
|
asmCmp32(op1_32, op2_32, flags32);
|
|
setEFlagsOSZAPC(flags32);
|
|
#else
|
|
Bit32u diff_32;
|
|
diff_32 = op1_32 - op2_32;
|
|
SET_FLAGS_OSZAPC_32(op1_32, op2_32, diff_32, BX_INSTR_COMPARE32);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::NEG_Ed(bxInstruction_c *i)
|
|
{
|
|
Bit32u op1_32, diff_32;
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
diff_32 = -op1_32;
|
|
BX_WRITE_32BIT_REGZ(i->rm(), diff_32);
|
|
}
|
|
else {
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
diff_32 = -op1_32;
|
|
Write_RMW_virtual_dword(diff_32);
|
|
}
|
|
|
|
SET_FLAGS_OSZAPC_RESULT_32(diff_32, BX_INSTR_NEG32);
|
|
}
|
|
|
|
|
|
void
|
|
BX_CPU_C::INC_Ed(bxInstruction_c *i)
|
|
{
|
|
Bit32u op1_32;
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
op1_32++;
|
|
BX_WRITE_32BIT_REGZ(i->rm(), op1_32);
|
|
}
|
|
else {
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
op1_32++;
|
|
Write_RMW_virtual_dword(op1_32);
|
|
}
|
|
|
|
SET_FLAGS_OSZAP_RESULT_32(op1_32, BX_INSTR_INC32);
|
|
}
|
|
|
|
|
|
void
|
|
BX_CPU_C::DEC_Ed(bxInstruction_c *i)
|
|
{
|
|
Bit32u op1_32;
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
op1_32--;
|
|
BX_WRITE_32BIT_REGZ(i->rm(), op1_32);
|
|
}
|
|
else {
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
op1_32--;
|
|
Write_RMW_virtual_dword(op1_32);
|
|
}
|
|
|
|
SET_FLAGS_OSZAP_RESULT_32(op1_32, BX_INSTR_DEC32);
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::CMPXCHG_EdGd(bxInstruction_c *i)
|
|
{
|
|
#if (BX_CPU_LEVEL >= 4) || (BX_CPU_LEVEL_HACKED >= 4)
|
|
Bit32u op2_32, op1_32, diff_32;
|
|
|
|
if (i->modC0()) {
|
|
op1_32 = BX_READ_32BIT_REG(i->rm());
|
|
}
|
|
else {
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i), &op1_32);
|
|
}
|
|
|
|
diff_32 = EAX - op1_32;
|
|
|
|
SET_FLAGS_OSZAPC_32(EAX, op1_32, diff_32, BX_INSTR_COMPARE32);
|
|
|
|
if (diff_32 == 0) { // if accumulator == dest
|
|
// dest <-- src
|
|
op2_32 = BX_READ_32BIT_REG(i->nnn());
|
|
|
|
if (i->modC0()) {
|
|
BX_WRITE_32BIT_REGZ(i->rm(), op2_32);
|
|
}
|
|
else {
|
|
Write_RMW_virtual_dword(op2_32);
|
|
}
|
|
}
|
|
else {
|
|
// accumulator <-- dest
|
|
RAX = op1_32;
|
|
}
|
|
#else
|
|
BX_INFO(("CMPXCHG_EdGd: not supported for cpulevel <= 3"));
|
|
UndefinedOpcode(i);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
BX_CPU_C::CMPXCHG8B(bxInstruction_c *i)
|
|
{
|
|
#if (BX_CPU_LEVEL >= 5) || (BX_CPU_LEVEL_HACKED >= 5)
|
|
Bit32u op1_64_lo, op1_64_hi, diff;
|
|
|
|
if (i->modC0()) {
|
|
BX_INFO(("CMPXCHG8B: dest is reg: #UD"));
|
|
UndefinedOpcode(i);
|
|
}
|
|
|
|
read_virtual_dword(i->seg(), RMAddr(i), &op1_64_lo);
|
|
read_RMW_virtual_dword(i->seg(), RMAddr(i) + 4, &op1_64_hi);
|
|
|
|
diff = EAX - op1_64_lo;
|
|
diff |= EDX - op1_64_hi;
|
|
|
|
if (diff == 0) { // if accumulator == dest
|
|
// ZF = 1
|
|
set_ZF(1);
|
|
// dest <-- src
|
|
Write_RMW_virtual_dword(ECX);
|
|
write_virtual_dword(i->seg(), RMAddr(i), &EBX);
|
|
}
|
|
else {
|
|
// ZF = 0
|
|
set_ZF(0);
|
|
// accumulator <-- dest
|
|
RAX = op1_64_lo;
|
|
RDX = op1_64_hi;
|
|
}
|
|
|
|
#else
|
|
BX_INFO(("CMPXCHG8B: not supported for cpulevel <= 4"));
|
|
UndefinedOpcode(i);
|
|
#endif
|
|
}
|