608 lines
15 KiB
C++
608 lines
15 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2012 The Bochs Project
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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., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
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/////////////////////////////////////////////////////////////////////////
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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#include "cpu.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::INC_RX(bxInstruction_c *i)
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{
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Bit32u rx = ++BX_READ_16BIT_REG(i->rm());
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SET_FLAGS_OSZAP_ADD_16(rx - 1, 0, rx);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DEC_RX(bxInstruction_c *i)
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{
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Bit32u rx = --BX_READ_16BIT_REG(i->rm());
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SET_FLAGS_OSZAP_SUB_16(rx + 1, 0, rx);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_EwGwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u sum_16 = op1_16 + op2_16;
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write_RMW_virtual_word(sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_GwEwR(bxInstruction_c *i)
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{
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u sum_16 = op1_16 + op2_16;
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BX_WRITE_16BIT_REG(i->nnn(), sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_GwEwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = read_virtual_word(i->seg(), eaddr);
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Bit32u sum_16 = op1_16 + op2_16;
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BX_WRITE_16BIT_REG(i->nnn(), sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_AXIw(bxInstruction_c *i)
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{
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Bit32u op1_16 = AX;
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Bit32u op2_16 = i->Iw();
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Bit32u sum_16 = op1_16 + op2_16;
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AX = sum_16;
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EwGwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u sum_16 = op1_16 + op2_16 + getB_CF();
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write_RMW_virtual_word(sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_GwEwR(bxInstruction_c *i)
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{
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u sum_16 = op1_16 + op2_16 + getB_CF();
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BX_WRITE_16BIT_REG(i->nnn(), sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_GwEwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = read_virtual_word(i->seg(), eaddr);
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Bit32u sum_16 = op1_16 + op2_16 + getB_CF();
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BX_WRITE_16BIT_REG(i->nnn(), sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_AXIw(bxInstruction_c *i)
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{
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Bit32u op1_16 = AX;
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Bit32u op2_16 = i->Iw();
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Bit32u sum_16 = op1_16 + op2_16 + getB_CF();
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AX = sum_16;
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_EwGwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u diff_16 = op1_16 - (op2_16 + getB_CF());
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write_RMW_virtual_word(diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_GwEwR(bxInstruction_c *i)
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{
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u diff_16 = op1_16 - (op2_16 + getB_CF());
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BX_WRITE_16BIT_REG(i->nnn(), diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_GwEwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = read_virtual_word(i->seg(), eaddr);
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Bit32u diff_16 = op1_16 - (op2_16 + getB_CF());
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BX_WRITE_16BIT_REG(i->nnn(), diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_AXIw(bxInstruction_c *i)
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{
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Bit32u op1_16 = AX;
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Bit32u op2_16 = i->Iw();
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Bit32u diff_16 = op1_16 - (op2_16 + getB_CF());
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AX = diff_16;
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_EwIwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = i->Iw();
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Bit32u diff_16 = op1_16 - (op2_16 + getB_CF());
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write_RMW_virtual_word(diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SBB_EwIwR(bxInstruction_c *i)
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{
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Bit32u op1_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u op2_16 = i->Iw();
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Bit32u diff_16 = op1_16 - (op2_16 + getB_CF());
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BX_WRITE_16BIT_REG(i->rm(), diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EwGwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u diff_16 = op1_16 - op2_16;
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write_RMW_virtual_word(diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_GwEwR(bxInstruction_c *i)
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{
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u diff_16 = op1_16 - op2_16;
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BX_WRITE_16BIT_REG(i->nnn(), diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_GwEwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = read_virtual_word(i->seg(), eaddr);
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Bit32u diff_16 = op1_16 - op2_16;
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BX_WRITE_16BIT_REG(i->nnn(), diff_16);
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_AXIw(bxInstruction_c *i)
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{
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Bit32u op1_16 = AX;
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Bit32u op2_16 = i->Iw();
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Bit32u diff_16 = op1_16 - op2_16;
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AX = diff_16;
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_EwGwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u diff_16 = op1_16 - op2_16;
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_GwEwR(bxInstruction_c *i)
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{
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u diff_16 = op1_16 - op2_16;
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_GwEwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u op2_16 = read_virtual_word(i->seg(), eaddr);
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Bit32u diff_16 = op1_16 - op2_16;
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_AXIw(bxInstruction_c *i)
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{
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Bit32u op1_16 = AX;
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Bit32u op2_16 = i->Iw();
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Bit32u diff_16 = op1_16 - op2_16;
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SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CBW(bxInstruction_c *i)
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{
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/* CBW: no flags are effected */
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AX = (Bit8s) AL;
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CWD(bxInstruction_c *i)
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{
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/* CWD: no flags are affected */
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if (AX & 0x8000) {
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DX = 0xFFFF;
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}
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else {
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DX = 0x0000;
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::XADD_EwGwM(bxInstruction_c *i)
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{
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/* XADD dst(r/m), src(r)
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* temp <-- src + dst | sum = op2 + op1
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* src <-- dst | op2 = op1
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* dst <-- tmp | op1 = sum
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*/
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u sum_16 = op1_16 + op2_16;
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write_RMW_virtual_word(sum_16);
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/* and write destination into source */
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BX_WRITE_16BIT_REG(i->nnn(), op1_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::XADD_EwGwR(bxInstruction_c *i)
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{
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/* XADD dst(r/m), src(r)
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* temp <-- src + dst | sum = op2 + op1
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* src <-- dst | op2 = op1
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* dst <-- tmp | op1 = sum
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*/
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Bit32u op1_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u op2_16 = BX_READ_16BIT_REG(i->nnn());
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Bit32u sum_16 = op1_16 + op2_16;
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// and write destination into source
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// Note: if both op1 & op2 are registers, the last one written
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// should be the sum, as op1 & op2 may be the same register.
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// For example: XADD AL, AL
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BX_WRITE_16BIT_REG(i->nnn(), op1_16);
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BX_WRITE_16BIT_REG(i->rm(), sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_EwIwM(bxInstruction_c *i)
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{
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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Bit32u op2_16 = i->Iw();
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Bit32u sum_16 = op1_16 + op2_16;
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write_RMW_virtual_word(sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADD_EwIwR(bxInstruction_c *i)
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{
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Bit32u op1_16 = BX_READ_16BIT_REG(i->rm());
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Bit32u op2_16 = i->Iw();
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Bit32u sum_16 = op1_16 + op2_16;
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BX_WRITE_16BIT_REG(i->rm(), sum_16);
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SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EwIwM(bxInstruction_c *i)
|
|
{
|
|
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
|
|
|
|
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
Bit32u op2_16 = i->Iw();
|
|
Bit32u sum_16 = op1_16 + op2_16 + getB_CF();
|
|
|
|
write_RMW_virtual_word(sum_16);
|
|
|
|
SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ADC_EwIwR(bxInstruction_c *i)
|
|
{
|
|
Bit32u op1_16 = BX_READ_16BIT_REG(i->rm());
|
|
Bit32u op2_16 = i->Iw();
|
|
Bit32u sum_16 = op1_16 + op2_16 + getB_CF();
|
|
|
|
BX_WRITE_16BIT_REG(i->rm(), sum_16);
|
|
|
|
SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EwIwM(bxInstruction_c *i)
|
|
{
|
|
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
|
|
|
|
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
Bit32u op2_16 = i->Iw();
|
|
Bit32u diff_16 = op1_16 - op2_16;
|
|
|
|
write_RMW_virtual_word(diff_16);
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SUB_EwIwR(bxInstruction_c *i)
|
|
{
|
|
Bit32u op1_16 = BX_READ_16BIT_REG(i->rm());
|
|
Bit32u op2_16 = i->Iw();
|
|
Bit32u diff_16 = op1_16 - op2_16;
|
|
|
|
BX_WRITE_16BIT_REG(i->rm(), diff_16);
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_EwIwM(bxInstruction_c *i)
|
|
{
|
|
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
|
|
|
|
Bit32u op1_16 = read_virtual_word(i->seg(), eaddr);
|
|
Bit32u op2_16 = i->Iw();
|
|
Bit32u diff_16 = op1_16 - op2_16;
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMP_EwIwR(bxInstruction_c *i)
|
|
{
|
|
Bit32u op1_16 = BX_READ_16BIT_REG(i->rm());
|
|
Bit32u op2_16 = i->Iw();
|
|
Bit32u diff_16 = op1_16 - op2_16;
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::NEG_EwM(bxInstruction_c *i)
|
|
{
|
|
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
|
|
|
|
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
op1_16 = 0 - (Bit32s)(Bit16s)(op1_16);
|
|
write_RMW_virtual_word(op1_16);
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(0, 0 - op1_16, op1_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::NEG_EwR(bxInstruction_c *i)
|
|
{
|
|
Bit32u op1_16 = BX_READ_16BIT_REG(i->rm());
|
|
op1_16 = 0 - (Bit32s)(Bit16s)(op1_16);
|
|
BX_WRITE_16BIT_REG(i->rm(), op1_16);
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(0, 0 - op1_16, op1_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::INC_EwM(bxInstruction_c *i)
|
|
{
|
|
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
|
|
|
|
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
op1_16++;
|
|
write_RMW_virtual_word(op1_16);
|
|
|
|
SET_FLAGS_OSZAP_ADD_16(op1_16 - 1, 0, op1_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DEC_EwM(bxInstruction_c *i)
|
|
{
|
|
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
|
|
|
|
Bit32u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
op1_16--;
|
|
write_RMW_virtual_word(op1_16);
|
|
|
|
SET_FLAGS_OSZAP_SUB_16(op1_16 + 1, 0, op1_16);
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMPXCHG_EwGwM(bxInstruction_c *i)
|
|
{
|
|
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
|
|
|
|
Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
Bit16u diff_16 = AX - op1_16;
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(AX, op1_16, diff_16);
|
|
|
|
if (diff_16 == 0) { // if accumulator == dest
|
|
// dest <-- src
|
|
write_RMW_virtual_word(BX_READ_16BIT_REG(i->nnn()));
|
|
}
|
|
else {
|
|
// accumulator <-- dest
|
|
AX = op1_16;
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::CMPXCHG_EwGwR(bxInstruction_c *i)
|
|
{
|
|
Bit16u op1_16 = BX_READ_16BIT_REG(i->rm());
|
|
Bit16u diff_16 = AX - op1_16;
|
|
|
|
SET_FLAGS_OSZAPC_SUB_16(AX, op1_16, diff_16);
|
|
|
|
if (diff_16 == 0) { // if accumulator == dest
|
|
// dest <-- src
|
|
BX_WRITE_16BIT_REG(i->rm(), BX_READ_16BIT_REG(i->nnn()));
|
|
}
|
|
else {
|
|
// accumulator <-- dest
|
|
AX = op1_16;
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|