linux-kernel - [PATCH 2/3] objtool/x86: Add UDB support

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Message-ID: <20250924134644.027686159@infradead.org>
Date: Wed, 24 Sep 2025 15:45:09 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: jpoimboe@...nel.org,
 x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
 peterz@...radead.org,
 alexandre.chartre@...cle.com
Subject: [PATCH 2/3] objtool/x86: Add UDB support

Per commit 85a2d4a890dc ("x86,ibt: Use UDB instead of 0xEA"), make
sure objtool also recognises UDB as a #UD instruction.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 tools/objtool/arch/x86/decode.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -683,6 +683,10 @@ int arch_decode_instruction(struct objto
 		insn->type = INSN_SYSRET;
 		break;
 
+	case 0xd6: /* udb */
+		insn->type = INSN_BUG;
+		break;
+
 	case 0xe0: /* loopne */
 	case 0xe1: /* loope */
 	case 0xe2: /* loop */