From nobody Wed Sep 17 23:51:34 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D1C24C4332F for ; Thu, 15 Dec 2022 04:03:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229658AbiLOEDV (ORCPT ); Wed, 14 Dec 2022 23:03:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54610 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229708AbiLOECR (ORCPT ); Wed, 14 Dec 2022 23:02:17 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BAD721FF94 for ; Wed, 14 Dec 2022 20:02:16 -0800 (PST) Received: from loongson.cn (unknown [111.9.175.10]) by gateway (Coremail) with SMTP id _____8Bx1vBHnJpj7LkFAA--.12962S3; Thu, 15 Dec 2022 12:02:15 +0800 (CST) Received: from localhost.localdomain (unknown [111.9.175.10]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxtOVDnJpjVBkAAA--.887S5; Thu, 15 Dec 2022 12:02:15 +0800 (CST) From: Jinyang He To: Huacai Chen , WANG Xuerui , Qing Zhang Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Mark Rutland Subject: [PATCH 3/6] LoongArch: Adjust PC value when unwind next frame in prologue unwinder Date: Thu, 15 Dec 2022 12:01:38 +0800 Message-Id: <20221215040141.18610-4-hejinyang@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221215040141.18610-1-hejinyang@loongson.cn> References: <20221215040141.18610-1-hejinyang@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8BxtOVDnJpjVBkAAA--.887S5 X-CM-SenderInfo: pkhmx0p1dqwqxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7ZryUAFyftFyrGr4kGrykZrb_yoW8JFy8p3 93AFZ5Gr4jqr13G39rtr4Dur95CrykGr42gFWDtry8u3Z0qFn7urnI9ryqvanYq34kJr10 qw1Fg3ya9F4UJwUanT9S1TB71UUUUjUqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bSxYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4 x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1l n4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6x ACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5McIj6I8E 87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxV Aaw2AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxY O2xFxVAFwI0_Jrv_JF1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGV WUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_ Xr0_Ar1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rV WUJVWUCwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4U JbIYCTnIWIevJa73UjIFyTuYvjxUxhiSDUUUU Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When state->first is not set, the PC is a return address in the previous frame. We need to adjust it value in case overflow to the next symbol. Signed-off-by: Jinyang He --- arch/loongarch/kernel/unwind_prologue.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kerne= l/unwind_prologue.c index 35cab7f77c6b..d464c533c64f 100644 --- a/arch/loongarch/kernel/unwind_prologue.c +++ b/arch/loongarch/kernel/unwind_prologue.c @@ -48,7 +48,7 @@ static bool unwind_by_prologue(struct unwind_state *state) { long frame_ra =3D -1; unsigned long frame_size =3D 0; - unsigned long size, offset, pc =3D state->pc; + unsigned long size, offset, pc; struct pt_regs *regs; struct stack_info *info =3D &state->stack_info; union loongarch_instruction *ip, *ip_end; @@ -70,6 +70,10 @@ static bool unwind_by_prologue(struct unwind_state *stat= e) return true; } =20 + /* When first is not set, the PC is a return address in the previous fram= e. + * We need to adjust it value in case overflow to the next symbol. + */ + pc =3D state->pc - (state->first ? 0 : LOONGARCH_INSN_SIZE); if (!kallsyms_lookup_size_offset(pc, &size, &offset)) return false; =20 --=20 2.34.3