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feat(cpu): properly implement STR STRH and STRB

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-01-03 17:48:43 -06:00
parent dee0e113d8
commit 44d52d8137
2 changed files with 4 additions and 15 deletions
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5
src/cpu/half_signed_data_transfer.zig
View File

@ -51,10 +51,7 @@ pub fn comptimeHalfSignedDataTransfer(comptime P: bool, comptime U: bool, compti
} else {
if (opcode >> 5 & 0x01 == 0x01) {
// STRH
const src = @truncate(u16, cpu.r[rd]);
bus.write16(address + 2, src);
bus.write16(address, src);
bus.write16(address, @truncate(u16, cpu.r[rd]));
} else {
std.debug.panic("[CPU] TODO: Figure out if this is also SWP", .{});
}

14
src/cpu/single_data_transfer.zig
View File

@ -31,19 +31,11 @@ pub fn comptimeSingleDataTransfer(comptime I: bool, comptime P: bool, comptime U
} else {
if (B) {
// STRB
const src = @truncate(u8, cpu.r[rd]);
bus.write8(address + 3, src);
bus.write8(address + 2, src);
bus.write8(address + 1, src);
bus.write8(address, src);
bus.write8(address, @truncate(u8, cpu.r[rd]));
} else {
// STR
// FIXME: Is this right?
const src = cpu.r[rd];
const aligned_addr = address - (address % 4);
bus.write32(aligned_addr, src);
const force_aligned = address & 0xFFFF_FFFC;
bus.write32(force_aligned, cpu.r[rd]);
}
}