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fix: properly decode format 11 instructions

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-02-12 03:13:38 -04:00
parent b93bd53529
commit 783706193b
2 changed files with 5 additions and 5 deletions
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2
src/cpu.zig
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@@ -496,7 +496,7 @@ fn thumbPopulate() [0x400]ThumbInstrFn {
}, },
0b001 => blk: { 0b001 => blk: {
const L = i >> 5 & 1 == 1; const L = i >> 5 & 1 == 1;
const rd = i >> 2 & 0x3; const rd = i >> 2 & 0x7;
break :blk format11(L, rd); break :blk format11(L, rd);
}, },
0b010 => blk: { 0b010 => blk: {

8
src/cpu/thumb/block_data_transfer.zig
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@@ -5,12 +5,12 @@ const InstrFn = @import("../../cpu.zig").ThumbInstrFn;
pub fn format14(comptime L: bool, comptime R: bool) InstrFn { pub fn format14(comptime L: bool, comptime R: bool) InstrFn {
return struct { return struct {
fn inner(cpu: *Arm7tdmi, bus: *Bus, opcode: u16) void { fn inner(cpu: *Arm7tdmi, bus: *Bus, opcode: u16) void {
const count = countRlist(opcode); const count = @boolToInt(R) + countRlist(opcode);
const start = cpu.r[13] - if (!L) 4 * (@boolToInt(R) + count) else 0; const start = cpu.r[13] - if (!L) count * 4 else 0;
var end = cpu.r[13]; var end = cpu.r[13];
if (L) { if (L) {
end += 4 * (@boolToInt(R) + count); end += count * 4;
} else { } else {
end -= 4; end -= 4;
} }
@@ -40,7 +40,7 @@ pub fn format14(comptime L: bool, comptime R: bool) InstrFn {
address += 4; address += 4;
} }
cpu.r[13] = if (L) end else cpu.r[13] - 4 * (@boolToInt(R) + count); cpu.r[13] = if (L) end else start;
} }
}.inner; }.inner;
} }