From 6232e8b1daf7067cb2e8065687530d5f88ecb46d Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Fri, 15 Jan 2021 18:40:31 -0800
Subject: support xchg AX/reg

---
 src/long_mode/mod.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/long_mode/mod.rs')

diff --git a/src/long_mode/mod.rs b/src/long_mode/mod.rs
index f9be9ab..909157b 100644
--- a/src/long_mode/mod.rs
+++ b/src/long_mode/mod.rs
@@ -6079,6 +6079,20 @@ fn read_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter: T,
                     }
                     1 => {
                         // Zv_AX
+                        let opwidth = imm_width_from_prefixes_64(SizeCode::vqp, instruction.prefixes);
+                        let bank = if opwidth == 4 {
+                            RegisterBank::D
+                        } else if opwidth == 2 {
+                            RegisterBank::W
+                        } else {
+                            RegisterBank::Q
+                        };
+                        instruction.modrm_rrr =
+                            RegSpec::from_parts(0, instruction.prefixes.rex().b(), bank);
+                        instruction.operands[1] = OperandSpec::RegMMM;
+                        instruction.modrm_mmm =
+                            RegSpec::from_parts(reg, instruction.prefixes.rex().b(), bank);
+                        instruction.operand_count = 2;
                     }
                     2 => {
                         // these are Zb_Ib_R
-- 
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