paoda/zba
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

feat(cpu): implement SWI

Browse Source
This commit is contained in:
Rekai Nyangadzayi Musuka
2022-01-25 10:33:16 -04:00
parent 1456d0f317
commit 997dc1314c
2 changed files with 34 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/cpu.zig
View File

@@ -15,6 +15,7 @@ const halfAndSignedDataTransfer = @import("cpu/arm/half_signed_data_transfer.zig
const blockDataTransfer = @import("cpu/arm/block_data_transfer.zig").blockDataTransfer;
const branch = @import("cpu/arm/branch.zig").branch;
const branchAndExchange = @import("cpu/arm/branch.zig").branchAndExchange;
const softwareInterrupt = @import("cpu/arm/software_interrupt.zig").softwareInterrupt;
// THUMB Instruction Groups
const format3 = @import("cpu/thumb/format3.zig").format3;
@@ -95,12 +96,15 @@ pub const Arm7tdmi = struct {
}
pub fn setCpsr(self: *Self, value: u32) void {
if (value & 0x1F != self.cpsr.raw & 0x1F) self.changeMode(@truncate(u5, value & 0x1F));
if (value & 0x1F != self.cpsr.raw & 0x1F) self.changeModeFromIdx(@truncate(u5, value & 0x1F));
self.cpsr.raw = value;
}
fn changeMode(self: *Self, next_idx: u5) void {
const next = getMode(next_idx);
fn changeModeFromIdx(self: *Self, next: u5) void {
self.changeMode(getMode(next));
}
pub fn changeMode(self: *Self, next: Mode) void {
const now = getMode(self.cpsr.mode.read());
// Bank R8 -> r12
@@ -142,7 +146,7 @@ pub const Arm7tdmi = struct {
},
}
self.cpsr.mode.write(next_idx);
self.cpsr.mode.write(@enumToInt(next));
}
pub fn skipBios(self: *Self) void {
@@ -348,6 +352,8 @@ fn armPopulate() [0x1000]ArmInstrFn {
const L = i >> 8 & 1 == 1;
lut[i] = branch(L);
}
if (i >> 8 & 0xF == 0b1111) lut[i] = softwareInterrupt();
}
return lut;