From 67b5b7a615feb8aaaca93ea5cae543370ae9c11a Mon Sep 17 00:00:00 2001
From: Jared Burce <jaredr@gmail.com>
Date: Sat, 3 Apr 2021 01:14:51 -0700
Subject: [PATCH] emu: modrm8 r8 decode had HI/LO registers backwards

---
 src/emu/i8088.rs | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/emu/i8088.rs b/src/emu/i8088.rs
index cf0865f..62dd8da 100644
--- a/src/emu/i8088.rs
+++ b/src/emu/i8088.rs
@@ -271,14 +271,14 @@ macro_rules! step {
   (@r8 $cookie:tt, $cpu:expr, $bus:expr, $prefix:tt, ($modrm_val:ident, $modrm:tt, $modrm16:tt, $modrm8:tt)) => {
     // TODO: Should these also be passed into the macro like the modrm specs?
     match $modrm_val >> 3 & 0x7 {
-      0 => step!(@arg $cookie, RegHi { reg: &$cpu.a } ),
-      1 => step!(@arg $cookie, RegHi { reg: &$cpu.c } ),
-      2 => step!(@arg $cookie, RegHi { reg: &$cpu.d } ),
-      3 => step!(@arg $cookie, RegHi { reg: &$cpu.b } ),
-      4 => step!(@arg $cookie, RegLo { reg: &$cpu.a } ),
-      5 => step!(@arg $cookie, RegLo { reg: &$cpu.c } ),
-      6 => step!(@arg $cookie, RegLo { reg: &$cpu.d } ),
-      7 => step!(@arg $cookie, RegLo { reg: &$cpu.b } ),
+      0 => step!(@arg $cookie, RegLo { reg: &$cpu.a } ),
+      1 => step!(@arg $cookie, RegLo { reg: &$cpu.c } ),
+      2 => step!(@arg $cookie, RegLo { reg: &$cpu.d } ),
+      3 => step!(@arg $cookie, RegLo { reg: &$cpu.b } ),
+      4 => step!(@arg $cookie, RegHi { reg: &$cpu.a } ),
+      5 => step!(@arg $cookie, RegHi { reg: &$cpu.c } ),
+      6 => step!(@arg $cookie, RegHi { reg: &$cpu.d } ),
+      7 => step!(@arg $cookie, RegHi { reg: &$cpu.b } ),
       _ => unreachable!()
     };
   };