From 66f3a50f36b70c001244f846f9cd3bc848809aea Mon Sep 17 00:00:00 2001
From: James <49045138+ghidracadabra@users.noreply.github.com>
Date: Tue, 21 May 2024 16:36:38 +0000
Subject: [PATCH] GP-2630 added comment

---
 Ghidra/Processors/x86/data/languages/ia.sinc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Ghidra/Processors/x86/data/languages/ia.sinc b/Ghidra/Processors/x86/data/languages/ia.sinc
index 51ddeae37d..9693a5252a 100644
--- a/Ghidra/Processors/x86/data/languages/ia.sinc
+++ b/Ghidra/Processors/x86/data/languages/ia.sinc
@@ -773,6 +773,9 @@ define pcodeop vmxon;    # Enter VMX operation; opcode f3 0f C7 /6
 @define LONGMODE_OFF "opsize=opsize" # NOP
 @endif
 
+#when not in 64-bit mode, opcode 0x82 results in the same instruction as opcode 0x80
+#in 64-bit mode, opcode 0x82 results in #UD
+#see 22.15 "Undefined Opcodes" of the intel manual
 @ifdef IA64
 @define BYTE_80_82 "(byte=0x80 | (longMode=0 & byte=0x82))"
 @else