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Diffstat (limited to 'src/cpu/exchange.rs')
-rw-r--r-- | src/cpu/exchange.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/cpu/exchange.rs b/src/cpu/exchange.rs new file mode 100644 index 0000000..1e74a75 --- /dev/null +++ b/src/cpu/exchange.rs @@ -0,0 +1,45 @@ +/* + 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/>. +*/ + +macro_rules! exchange { + ($cpu: ident, $t: expr) => {{ + use crate::log_status; + use crate::cpu::Fetcher; + + log_status!("exchanging to {}", match $t { + false => "ARM", + true => "Thumb", + }); + + const DATA: [(u32, Fetcher); 0x2] = [ + (0x4, Cpu::fetch_arm), + (0x2, Cpu::fetch_thumb), + ]; + + let index = $t as usize & 0b1; + + $cpu.instruction_size = unsafe { DATA.get_unchecked(index).0 }; + $cpu.fetcher = unsafe { DATA.get_unchecked(index).1 }; + }}; +} +pub(crate) use exchange; |