linux-kernel - [tip: objtool/core] objtool/x86: Add UDB support

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Message-ID: <176044247750.709179.8482885603845997240.tip-bot2@tip-bot2>
Date: Tue, 14 Oct 2025 11:47:57 -0000
From: "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Alexandre Chartre <alexandre.chartre@...cle.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] objtool/x86: Add UDB support

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     76e1851a1bc28e760d6acc7a54ec9dce05717028
Gitweb:        https://git.kernel.org/tip/76e1851a1bc28e760d6acc7a54ec9dce05717028
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Wed, 24 Sep 2025 15:25:27 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 14 Oct 2025 13:43:11 +02:00

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>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
---
 tools/objtool/arch/x86/decode.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index ce16fb2..ef6e96d 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -683,6 +683,10 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
 		insn->type = INSN_SYSRET;
 		break;
 
+	case 0xd6: /* udb */
+		insn->type = INSN_BUG;
+		break;
+
 	case 0xe0: /* loopne */
 	case 0xe1: /* loope */
 	case 0xe2: /* loop */