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/>.

// mul r/m, 8-bit

void EmulatorPimpl::mulf6()

{

    auto v1 = read_data<uint8_t>();

    auto v2 = registers->get(AL);

    uint16_t result, flags;

    std::tie(flags, result) = do_mul<uint16_t>(v1, v2);

    flags &= ~(CF | OF | ZF);

    if (result & 0xff00)

        flags |= CF | OF;

    registers->set(AX, result);

    registers->set_flags(flags, OF | CF | ZF);

}

// mul r/m, 16-bit

void EmulatorPimpl::mulf7()

{

    auto v1 = read_data<uint16_t>();

    auto v2 = registers->get(AX);

    uint32_t result;

    uint16_t flags;

    std::tie(flags, result) = do_mul<uint32_t>(v1, v2);

    flags &= ~(CF | OF | ZF);

    if (result & 0xffff0000)

        flags |= CF | OF;

    registers->set(AX, result & 0xffff);

    registers->set(DX, (result >> 16) & 0xffff);

    registers->set_flags(flags, OF | CF | ZF);

}