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jamieiles |
// Copyright Jamie Iles, 2017
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//
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// This file is part of s80x86.
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//
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// s80x86 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// s80x86 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with s80x86. If not, see <http://www.gnu.org/licenses/>.
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void EmulatorPimpl::cmpsba6()
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{
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auto cmps = [&]() {
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auto s = mem->read<uint8_t>(get_phys_addr(
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registers->get(get_segment(false)), registers->get(SI)));
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auto d = mem->read<uint8_t>(
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get_phys_addr(registers->get(ES), registers->get(DI)));
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uint8_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint8_t>(s, d);
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registers->set_flags(flags, OF | SF | ZF | AF | CF | PF);
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if (registers->get_flag(DF)) {
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registers->set(DI, registers->get(DI) - 1);
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registers->set(SI, registers->get(SI) - 1);
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} else {
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registers->set(DI, registers->get(DI) + 1);
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registers->set(SI, registers->get(SI) + 1);
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}
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};
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do_rep(cmps, [&]() { return string_rep_complete(); });
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}
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void EmulatorPimpl::cmpswa7()
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{
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auto cmps = [&]() {
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auto s = mem->read<uint16_t>(get_phys_addr(
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registers->get(get_segment(false)), registers->get(SI)));
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auto d = mem->read<uint16_t>(
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get_phys_addr(registers->get(ES), registers->get(DI)));
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uint16_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint16_t>(s, d);
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registers->set_flags(flags, OF | SF | ZF | AF | CF | PF);
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if (registers->get_flag(DF)) {
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registers->set(DI, registers->get(DI) - 2);
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registers->set(SI, registers->get(SI) - 2);
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} else {
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registers->set(DI, registers->get(DI) + 2);
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registers->set(SI, registers->get(SI) + 2);
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}
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};
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do_rep(cmps, [&]() { return string_rep_complete(); });
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}
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