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/*
Copyright 2021-2023 Gabriel Jensen.
This file is part of Luma.
Luma is free software: you can redistribute it
and/or modify it under the terms of the GNU
Affero General Public License as published by
the Free Software Foundation, either version 3
of the License, or (at your option) any later
version.
Luma 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
Affero General Public License for more details.
You should have received a copy of the GNU
Affero General Public License along with Luma.
If not, see <https://www.gnu.org/licenses/>.
*/
use crate::cpu::{Cpu, exchange, take_state_mut};
use crate::cpu_mode::CpuMode;
impl Cpu {
pub(super) fn exit_exception(&mut self) {
take_state_mut!(state, self);
let cpsr = state.read_cpsr();
let old_mode = CpuMode::from_raw((cpsr & 0b00000000000000000000000000011111) as u8);
let spsr = state.read_spsr(old_mode);
let new_mode = CpuMode::from_raw((spsr & 0b00000000000000000000000000011111) as u8);
let t = spsr & 0b00000000000000000000000000100000 != 0x0;
state.write_cpsr(spsr);
state.bank(new_mode);
exchange!(self, t);
}
}
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