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fix(cpu): account for rn in rlist in block data transfer

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-10-21 05:12:10 -03:00
parent 85e0924669
commit 7dbd2fc556
1 changed files with 12 additions and 7 deletions
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19
src/cpu/arm/block_data_transfer.zig
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@ -11,34 +11,39 @@ pub fn blockDataTransfer(comptime P: bool, comptime U: bool, comptime S: bool, c
const rn = opcode >> 16 & 0xF;
const base = cpu.r[rn];
var address: u32 = undefined;
const in_list = opcode >> @truncate(u4, rn) & 1 == 1;
var address: u32 = base;
if (U) {
// Increment
address = if (P) base + 4 else base;
var i: u5 = 0;
while (i < 0x10) : (i += 1) {
if (opcode >> i & 1 == 1) {
if (P) address += 4;
transfer(cpu, bus, r15_present, i, address);
address += 4;
if (!P) address += 4;
}
}
} else {
// Decrement
address = if (P) base - 4 else base;
var i: u5 = 0x10;
while (i > 0) : (i -= 1) {
const j = i - 1;
if (opcode >> j & 1 == 1) {
if (P) address -= 4;
transfer(cpu, bus, r15_present, j, address);
address -= 4;
if (!P) address -= 4;
}
}
}
if (W and P or !P) cpu.r[rn] = if (U) address else address + 4;
if (W) {
if (!L or (L and !in_list)) {
cpu.r[rn] = address;
}
}
}
fn transfer(cpu: *Arm7tdmi, bus: *Bus, r15_present: bool, i: u5, address: u32) void {