blob: 3307dbfa7845b120d23e4fd5f6395d4ed29b794d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
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/>.
*/
use crate::log;
use crate::cpu::{Cpu, exchange, take_state_mut};
impl Cpu {
pub(super) fn isa_bx(&mut self, rm: u8) {
take_state_mut!(state, self);
log!("bx r{rm}");
let mut target = state.read_register(rm);
let t = target & 0b00000000000000000000000000000001 != 0x0;
exchange!(self, t);
let cpsr = state.read_cpsr() & 0b11111111111111111111111111011111 | (t as u32) << 0x5;
state.write_cpsr(cpsr);
target &= 0b11111111111111111111111111111110;
target = target.wrapping_add(self.instruction_size);
state.write_register(0xF, target);
}
}
|
