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fix(cpu): properly decode multiply instructions

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-01-30 02:16:12 -04:00
parent a459d4b433
commit dd632975f8
2 changed files with 8 additions and 8 deletions
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14
src/cpu.zig
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@ -449,13 +449,6 @@ fn armPopulate() [0x1000]ArmInstrFn {
lut[i] = psrTransfer(I, R, kind);
}
if (i >> 6 & 0x3F == 0b000000 and i & 0xF == 0b1001) {
const A = i >> 5 & 1 == 1;
const S = i >> 4 & 1 == 1;
lut[i] = multiply(A, S);
}
if (i == 0x121) {
lut[i] = branchAndExchange;
}
@ -470,6 +463,13 @@ fn armPopulate() [0x1000]ArmInstrFn {
lut[i] = halfAndSignedDataTransfer(P, U, I, W, L);
}
if (i >> 6 & 0x3F == 0b000000 and i & 0xF == 0b1001) {
const A = i >> 5 & 1 == 1;
const S = i >> 4 & 1 == 1;
lut[i] = multiply(A, S);
}
if (i >> 10 & 0x3 == 0b01) {
const I = i >> 9 & 1 == 1;
const P = i >> 8 & 1 == 1;

2
src/cpu/arm/half_signed_data_transfer.zig
View File

@ -58,7 +58,7 @@ pub fn halfAndSignedDataTransfer(comptime P: bool, comptime U: bool, comptime I:
// STRH
bus.write16(address, @truncate(u16, cpu.r[rd]));
} else {
std.debug.panic("[CPU] TODO: Figure out if this is also SWP", .{});
std.debug.print("[CPU|ARM|SignedDataTransfer] {X:0>8} was improperly decoded", .{opcode});
}
}