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feat: implement basic pipeline

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passes arm.gba, thumb.gb and armwrestler, fails in actual games
TODO: run FuzzARM debug specific titles
This commit is contained in:
Rekai Nyangadzayi Musuka
2022-06-29 06:33:17 -03:00
parent 62162ba492
commit b3ada64e64
13 changed files with 158 additions and 99 deletions
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8
src/core/cpu/barrel_shifter.zig
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@@ -18,11 +18,9 @@ pub fn execute(comptime S: bool, cpu: *Arm7tdmi, opcode: u32) u32 {
fn registerShift(comptime S: bool, cpu: *Arm7tdmi, opcode: u32) u32 {
const rs_idx = opcode >> 8 & 0xF;
const rm = cpu.r[opcode & 0xF];
const rs = @truncate(u8, cpu.r[rs_idx]);
const rm_idx = opcode & 0xF;
const rm = if (rm_idx == 0xF) cpu.fakePC() else cpu.r[rm_idx];
return switch (@truncate(u2, opcode >> 5)) {
0b00 => logicalLeft(S, &cpu.cpsr, rm, rs),
0b01 => logicalRight(S, &cpu.cpsr, rm, rs),
@@ -33,9 +31,7 @@ fn registerShift(comptime S: bool, cpu: *Arm7tdmi, opcode: u32) u32 {
pub fn immShift(comptime S: bool, cpu: *Arm7tdmi, opcode: u32) u32 {
const amount = @truncate(u8, opcode >> 7 & 0x1F);
const rm_idx = opcode & 0xF;
const rm = if (rm_idx == 0xF) cpu.fakePC() else cpu.r[rm_idx];
const rm = cpu.r[opcode & 0xF];
var result: u32 = undefined;
if (amount == 0) {