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fix: implement the same LDRSH logic as THUMB LDRSH

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-02-05 23:08:47 -04:00
parent c52dc5adb1
commit 1b9ab1f1d7
1 changed files with 7 additions and 1 deletions
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8
src/cpu/arm/half_signed_data_transfer.zig
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@ -45,7 +45,13 @@ pub fn halfAndSignedDataTransfer(comptime P: bool, comptime U: bool, comptime I:
},
0b11 => {
// LDRSH
result = util.u32SignExtend(16, bus.read16(address & 0xFFFF_FFFE));
const value = if (address & 1 == 1) blk: {
break :blk util.u32SignExtend(8, bus.read8(address));
} else blk: {
break :blk util.u32SignExtend(16, bus.read16(address));
};
result = std.math.rotr(u32, value, 8 * (address & 1));
},
0b00 => unreachable, // SWP
}