From: Alexandre Chartre <alexandre.chartre@oracle.com>
To: Peter Zijlstra <peterz@infradead.org>,
jpoimboe@kernel.org, x86@kernel.org
Cc: alexandre.chartre@oracle.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] objtool/x86: Add UDB support
Date: Thu, 25 Sep 2025 11:56:15 +0200 [thread overview]
Message-ID: <96fa4e52-6d38-49e0-b298-0d824ec9aacf@oracle.com> (raw)
In-Reply-To: <20250924134644.027686159@infradead.org>
On 9/24/25 15:45, Peter Zijlstra wrote:
> 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>
> ---
> 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 */
>
>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
alex.
next prev parent reply other threads:[~2025-09-25 9:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-24 13:45 [PATCH 0/3] objtool: Few x86 decoder updates Peter Zijlstra
2025-09-24 13:45 ` [PATCH 1/3] objtool/x86: Remove 0xea hack Peter Zijlstra
2025-09-25 9:55 ` Alexandre Chartre
2025-10-14 11:47 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2025-09-24 13:45 ` [PATCH 2/3] objtool/x86: Add UDB support Peter Zijlstra
2025-09-25 9:56 ` Alexandre Chartre [this message]
2025-10-14 11:47 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2025-09-24 13:45 ` [PATCH 3/3] objtool/x86: Fix NOP decode Peter Zijlstra
2025-09-24 17:34 ` Alexandre Chartre
2025-09-24 18:41 ` Peter Zijlstra
2025-09-25 9:55 ` Alexandre Chartre
2025-09-25 10:03 ` Peter Zijlstra
2025-09-25 10:42 ` Peter Zijlstra
2025-09-25 11:29 ` Andrew Cooper
2025-09-25 12:43 ` Peter Zijlstra
2025-09-25 13:04 ` Alexandre Chartre
2025-09-25 14:11 ` Peter Zijlstra
2025-09-25 13:05 ` Alexandre Chartre
2025-10-14 11:47 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
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