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/>.

void EmulatorPimpl::scasbae()

{

    auto scas = [&]() {

        auto v = mem->read<uint8_t>(

            get_phys_addr(registers->get(ES), registers->get(DI)));

        uint8_t result;

        uint16_t flags;

        std::tie(flags, result) = do_sub<uint8_t>(registers->get(AL), v);

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

        if (registers->get_flag(DF))

            registers->set(DI, registers->get(DI) - 1);

        else

            registers->set(DI, registers->get(DI) + 1);

    };

    do_rep(scas, [&]() { return string_rep_complete(); });

}

void EmulatorPimpl::scasbaf()

{

    auto scas = [&]() {

        auto v = mem->read<uint16_t>(

            get_phys_addr(registers->get(ES), registers->get(DI)));

        uint16_t result;

        uint16_t flags;

        std::tie(flags, result) = do_sub<uint16_t>(registers->get(AX), v);

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

        if (registers->get_flag(DF))

            registers->set(DI, registers->get(DI) - 2);

        else

            registers->set(DI, registers->get(DI) + 2);

    };

    do_rep(scas, [&]() { return string_rep_complete(); });

}