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feat(cpu): implement format2 THUMB instructions

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-01-29 18:46:27 -04:00
parent 4ca65caef0
commit 599e068c7e
3 changed files with 61 additions and 18 deletions
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8
src/cpu.zig
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@@ -22,6 +22,7 @@ const softwareInterrupt = @import("cpu/arm/software_interrupt.zig").softwareInte
// THUMB Instruction Groups
const format1 = @import("cpu/thumb/format1.zig").format1;
const format3 = @import("cpu/thumb/format3.zig").format3;
const format2 = @import("cpu/thumb/format2.zig").format2;
const format5 = @import("cpu/thumb/format5.zig").format5;
const format6 = @import("cpu/thumb/format6.zig").format6;
const format12 = @import("cpu/thumb/format12.zig").format12;
@@ -332,6 +333,13 @@ fn thumbPopulate() [0x400]ThumbInstrFn {
lut[i] = format1(op, offset);
}
if (i >> 5 & 0x1F == 0b00011) {
const I = i >> 4 & 1 == 1;
const is_sub = i >> 3 & 1 == 1;
const rn = i & 0x7;
lut[i] = format2(I, is_sub, rn);
}
if (i >> 7 & 0x7 == 0b001) {
const op = i >> 5 & 0x3;