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chore: account for empty rlist in THUMB LDM/STM

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-02-05 18:03:39 -04:00
parent 0a22730479
commit 3ae24d6977
1 changed files with 9 additions and 3 deletions
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12
src/cpu/thumb/block_data_transfer.zig
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@ -51,12 +51,18 @@ pub fn format15(comptime L: bool, comptime rb: u3) InstrFn {
return struct {
fn inner(cpu: *Arm7tdmi, bus: *Bus, opcode: u16) void {
const base = cpu.r[rb];
var address = base;
var address: u32 = base;
if (opcode & 0xFF == 0) {
// List is Empty
if (L) cpu.r[15] = bus.read32(address) else bus.write32(address, cpu.r[15]);
cpu.r[rb] += 0x40;
return;
}
var i: usize = 0;
var i: u4 = 0;
while (i < 8) : (i += 1) {
if ((opcode >> @truncate(u3, i)) & 1 == 1) {
if (opcode >> i & 1 == 1) {
if (L) {
cpu.r[i] = bus.read32(address);
} else {