Subversion Repositories s80186

// Copyright Jamie Iles, 2017

//

// This file is part of s80x86.

//

// s80x86 is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// s80x86 is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with s80x86.  If not, see <http://www.gnu.org/licenses/>.

// xchg r, r/m, 8-bit

void EmulatorPimpl::xchg86()

{

    modrm_decoder->set_width(OP_WIDTH_8);

    modrm_decoder->decode();

    auto v1 = read_data<uint8_t>();

    auto v2 = registers->get(modrm_decoder->reg());

    write_data<uint8_t>(v2);

    registers->set(modrm_decoder->reg(), v1);

}

// xchg r, r/m, 16-bit

void EmulatorPimpl::xchg87()

{

    modrm_decoder->set_width(OP_WIDTH_16);

    modrm_decoder->decode();

    auto v1 = read_data<uint16_t>();

    auto v2 = registers->get(modrm_decoder->reg());

    write_data<uint16_t>(v2);

    registers->set(modrm_decoder->reg(), v1);

}

// xchg accumulator, r

void EmulatorPimpl::xchg90_97()

{

    auto reg = static_cast<GPR>(static_cast<int>(AX) + (opcode & 0x7));

    auto v1 = registers->get(AX);

    auto v2 = registers->get(reg);

    registers->set(AX, v2);

    registers->set(reg, v1);

}