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[/] [s80186/] [trunk/] [sim/] [cppmodel/] [instructions/] [scas.cpp] - Rev 2
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// 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(); }); }