From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id DC1212882A7 for ; Thu, 27 Nov 2025 02:53:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764212007; cv=none; b=HDROrGSznuJoKKAj+77Rvs+za4inBEkZonVor7hUHgw+EgNpbAJGFWkIw5K43Oas4yQUin7Q3cpI7PjL8Vs7PS7wjWgdKq6Bd/rJLYdc1mB27p7JZcZdyUNPi2eRycwo7hCLR/MCMwsdJu/u+CxqoengiXTMT3kZeymefSUa0y8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764212007; c=relaxed/simple; bh=BHKUu2/FF8uRuGMPhZ8wlaVWl/4U/bUGNlKoXGKKpXU=; h=Subject:To:Cc:References:From:Message-ID:Date:MIME-Version: In-Reply-To:Content-Type; b=GyRdKAX2D1Ino6ER64ANTbFY2P3AUFvYiN/RmHLpmp5UD1Cf8A9twctD+kyK481xAMFf2eb90yN68dddaD1aGI9nW99wu3y7J2ZECFc4qIl5c7ucwz23cQ59L+dhSOxsk6EnhcRMSx6qy5Vp58ZE5dxOXDgqJGEsXG3wu9ebekA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [111.9.175.10]) by gateway (Coremail) with SMTP id _____8CxaNEivSdpNJYoAA--.22400S3; Thu, 27 Nov 2025 10:53:22 +0800 (CST) Received: from [10.136.12.26] (unknown [111.9.175.10]) by front1 (Coremail) with SMTP id qMiowJAxfcEfvSdpjZtAAQ--.53223S3; Thu, 27 Nov 2025 10:53:21 +0800 (CST) Subject: Re: [PATCH v1] LoongArch: Handle special PC in unwind_next_frame() To: Bibo Mao , Tiezhu Yang Cc: Huacai Chen , Xi Zhang , Xianglai Li , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org References: <20251125063327.31586-1-yangtiezhu@loongson.cn> <658bb477-b3f1-97c1-ab37-5dafcb6215f5@loongson.cn> <6cc59312-7cdc-19a5-4d18-e120ea9c7563@loongson.cn> <3c0602aa-a8bc-25b9-7d7a-467e04dbc519@loongson.cn> <45cf4a09-8895-73fb-c019-1b1f88501eed@loongson.cn> <87730f18-4ad7-2a21-f1bd-483074748b37@loongson.cn> <7ddd6efc-e7ad-b2f8-9a4d-5ca1cad9e74d@loongson.cn> From: Jinyang He Message-ID: <226cffcb-2302-8afb-8be6-9cab2176d15b@loongson.cn> Date: Thu, 27 Nov 2025 10:53:19 +0800 User-Agent: Mozilla/5.0 (X11; Linux loongarch64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <7ddd6efc-e7ad-b2f8-9a4d-5ca1cad9e74d@loongson.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-CM-TRANSID:qMiowJAxfcEfvSdpjZtAAQ--.53223S3 X-CM-SenderInfo: pkhmx0p1dqwqxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29K BjDU0xBIdaVrnRJUUU92b4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26c xKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1Y6r17M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vE j48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_JFI_Gr1l84ACjcxK6xIIjxv20xvEc7CjxV AFwI0_Jr0_Gr1l84ACjcxK6I8E87Iv67AKxVWxJVW8Jr1l84ACjcxK6I8E87Iv6xkF7I0E 14v26r4j6r4UJwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI 0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUXVWUAwAv7VC2z280 aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcVAKI48JMxk0xIA0c2IEe2 xFo4CEbIxvr21l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxYO2xF xVAFwI0_GFv_Wrylx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWw C2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_ JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJV WUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r1j6r4UYxBI daVFxhVjvjDU0xZFpf9x07j1WlkUUUUU= On 2025-11-27 09:53, Bibo Mao wrote: > > Just be curious, it is the same orc unwind method. why is clean with > file arch/x86/kernel/unwind_orc.c, however there is special handling > bt_address() in file arch/loongarch/kernel/unwind_orc.c ? > I'm not familiar with x86. Does it also copies exception handler to other address like LoongArch? When backtrace to the copied exception handler, its ORC info is not collected. The bt_address finds a shadow PC to get the right ORC info and go on. Thanks, Jinyang