[tip: objtool/core] objtool/x86: Add UDB support

tip-bot2 for Peter Zijlstra
2025-10-14T11:48:00Z

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@infradead.org>
AuthorDate: Wed, 24 Sep 2025 15:25:27 +02:00
Committer: Peter Zijlstra <peterz@infradead.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@infradead.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.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 */