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chore: implement THUMB format 4 instructions

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-01-29 20:42:13 -04:00
parent ae4023e51c
commit 2dde47318c
2 changed files with 119 additions and 0 deletions
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7
src/cpu.zig
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@@ -21,6 +21,7 @@ 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 format4 = @import("cpu/thumb/format4.zig").format4;
const format2 = @import("cpu/thumb/format2.zig").format2;
const format5 = @import("cpu/thumb/format5.zig").format5;
const format6 = @import("cpu/thumb/format6.zig").format6;
@@ -347,6 +348,12 @@ fn thumbPopulate() [0x400]ThumbInstrFn {
lut[i] = format3(op, rd);
}
if (i >> 4 & 0x3F == 0b010000) {
const op = i & 0xF;
lut[i] = format4(op);
}
if (i >> 4 & 0x3F == 0b010001) {
const op = i >> 2 & 0x3;
const h1 = i >> 1 & 1;