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fix: improper condition check and initialization of register

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-02-06 18:41:16 -04:00
parent bbd4447734
commit 7441dd151c
1 changed files with 2 additions and 2 deletions
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4
src/cpu.zig
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@ -81,7 +81,7 @@ pub const Arm7tdmi = struct {
.r = [_]u32{0x00} ** 16,
.sched = sched,
.bus = bus,
.cpsr = .{ .raw = 0x0000_00DF },
.cpsr = .{ .raw = 0x0000_001F },
.spsr = .{ .raw = 0x0000_0000 },
.banked_fiq = [_]u32{0x00} ** 10,
.banked_r = [_]u32{0x00} ** 12,
@ -429,7 +429,7 @@ pub fn checkCond(cpsr: PSR, cond: u4) bool {
0x6 => cpsr.v.read(), // VS - Overflow
0x7 => !cpsr.v.read(), // VC - No overflow
0x8 => cpsr.c.read() and !cpsr.z.read(), // HI - unsigned higher
0x9 => !cpsr.c.read() and cpsr.z.read(), // LS - unsigned lower or same
0x9 => !cpsr.c.read() or cpsr.z.read(), // LS - unsigned lower or same
0xA => cpsr.n.read() == cpsr.v.read(), // GE - Greater or equal
0xB => cpsr.n.read() != cpsr.v.read(), // LT - Less than
0xC => !cpsr.z.read() and (cpsr.n.read() == cpsr.v.read()), // GT - Greater than