From nobody Sun May 10 06:04:21 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4DEC1187561 for ; Tue, 31 Dec 2024 07:54:05 +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=1735631649; cv=none; b=gUrZsBcjlniQkg2SNjVCfqA/em4KJxXJFzVa9lz8iUVoyclDx6znoUwKEt2a/6coPqtnz/rSGtYmQPpUP7hcCj1yC4hj7NzEanEZ2tT5i5AZcCPII9BOh0fBPc6iWPOTSS2/U72qQiN0GGeRL9AaNDgvm0CJ4MVl+dZJkh9YUwM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735631649; c=relaxed/simple; bh=b/pFC+Vx168E8dTmVUIHcsYU88BX3EgWB+w74JWFF14=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=QAJoXOn5nrhtEK1H9gBwcIj6FlwqwjsMXoZMDtg67dF7C79qvKq4y6gm6NO6ePZHj3XoG5EKh9ss0E7XxJ6srdcSxLttCaPBtYXECj3+oodFTFAwGOqKyBRvIBuANvpQEeKoU+Nz0KQ/1+GjLIAdJDSDGUwNVO9dgHp/4MVMTbI= 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 [223.64.68.63]) by gateway (Coremail) with SMTP id _____8AxquAco3NnUVJcAA--.51031S3; Tue, 31 Dec 2024 15:54:04 +0800 (CST) Received: from localhost.localdomain (unknown [223.64.68.63]) by front1 (Coremail) with SMTP id qMiowMAxvsUYo3Nnth8PAA--.8118S2; Tue, 31 Dec 2024 15:54:04 +0800 (CST) From: Huacai Chen To: Huacai Chen Cc: loongarch@lists.linux.dev, Xuefeng Li , Guo Ren , Xuerui Wang , Jiaxun Yang , linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn, Huacai Chen Subject: [PATCH] LoongArch: Refactor bug_handler() implementation Date: Tue, 31 Dec 2024 15:53:53 +0800 Message-ID: <20241231075353.1458674-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowMAxvsUYo3Nnth8PAA--.8118S2 X-CM-SenderInfo: hfkh0x5xdftxo6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj9xXoWrZFy8WFy7Aw13XryrGry5KFX_yoWkXrX_Wr 13Cw18WrW8AayF93WqqFs7XryDuay8tFnak3Z2qrZxtF93Wr1rGr4jvwn0yrnYqFW5Gr45 XrWkX3Zaka4aqosvyTuYvTs0mTUanT9S1TB71UUUUUJqnTZGkaVYY2UrUUUUj1kv1TuYvT s0mT0YCTnIWjqI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUI cSsGvfJTRUUUb3kYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20x vaj40_Wr0E3s1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWUJVWUCwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV WUJVW8JwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6r4UJVWxJr1ln4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12 xvs2x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1Y 6r17McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64 vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxYO2xFxVAFwI0_ Jrv_JF1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1V AY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAI cVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42 IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r1j6r4UYxBIdaVFxhVj vjDU0xZFpf9x07jepB-UUUUU= Content-Type: text/plain; charset="utf-8" 1. Early return for user mode triggered exception with all types. 2. Give a chance to call fixup_exception() for default types (like S390). Signed-off-by: Huacai Chen --- arch/loongarch/kernel/traps.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index c57b4134f3e8..2ec3106c0da3 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -597,17 +597,24 @@ int is_valid_bugaddr(unsigned long addr) =20 static void bug_handler(struct pt_regs *regs) { + if (user_mode(regs)) { + force_sig(SIGTRAP); + return; + } + switch (report_bug(regs->csr_era, regs)) { case BUG_TRAP_TYPE_BUG: - case BUG_TRAP_TYPE_NONE: - die_if_kernel("Oops - BUG", regs); - force_sig(SIGTRAP); + die("Oops - BUG", regs); break; =20 case BUG_TRAP_TYPE_WARN: /* Skip the BUG instruction and continue */ regs->csr_era +=3D LOONGARCH_INSN_SIZE; break; + + default: + if (!fixup_exception(regs)) + die("Oops - BUG", regs); } } =20 --=20 2.43.5