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

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Message-ID: <96fa4e52-6d38-49e0-b298-0d824ec9aacf@oracle.com>
Date: Thu, 25 Sep 2025 11:56:15 +0200
From: Alexandre Chartre <alexandre.chartre@...cle.com>
To: Peter Zijlstra <peterz@...radead.org>, jpoimboe@...nel.org, x86@...nel.org
Cc: alexandre.chartre@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] objtool/x86: Add UDB support


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@...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 */
> 
> 

Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>

alex.