From mboxrd@z Thu Jan 1 00:00:00 1970 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 9C697C433F5 for ; Fri, 13 May 2022 15:42:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234924AbiEMPmJ (ORCPT ); Fri, 13 May 2022 11:42:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234792AbiEMPmF (ORCPT ); Fri, 13 May 2022 11:42:05 -0400 Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [IPv6:2a00:1450:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A22FD2409F for ; Fri, 13 May 2022 08:42:03 -0700 (PDT) Received: by mail-ej1-x632.google.com with SMTP id dk23so16993103ejb.8 for ; Fri, 13 May 2022 08:42:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=gTvT1Njz7DvJoj6oJmGxwAJ3l74LLHxTpiRWi5YeMEs=; b=EcALLeSkYxkKn0Wiet+U+DUHYshlagRqJJCh+HvzSZcVLz7z8IA4NP2fUQJSYnCJpy M08vs5nu1mQftUPSfuHwVIfiSCia13X+PqKtF3OGygz4THbwXXcwlJjD6iPSELy1WDu8 5DG6v7UPYsfAWejFbDvJ1PUR5NPRrK5suSR48G0TGRUU8qNwQ82eMoWHMN8XAS8MDjDo Odc7x8+n2I4JW2juGndQuKmBrWFccLzYQUDBn5ii3DDZM0LdvvfF4gMYr0PXOBBPYe0P 5pf9JeGFRHon5uGvyTVgXJ7V8dvQSLT0cq9NkD3MX5lBljd/fPZpSCzdV4YfhHCR9JQC gbEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=gTvT1Njz7DvJoj6oJmGxwAJ3l74LLHxTpiRWi5YeMEs=; b=ZM/htv0PHeSapQv8j7+jtw7hkjC5WBrwmVQuFcTqY2lmGH4k3tEpinZwb0Hy7pwfVa 8i7tks4yxVtkf4zL1UpBx4tmYhdEHi2Ki5uC3yZG0q9ZaRQFdJ51JwQAiR2QeDAlTm6D EDzY/NNV7V/I9nyoT3Dkck9WrJt2ErNHxiY/zIkDhNEvP996uW6zuMrDDNh1oviK+lht h5Kb1oe0Wud0il+QTGFa827wMzlmtXQ48Ox0uVV5BDJVPd2Cx4F/japAL7wyYVrpMzLL RWIru+FFOG1dWOE2Pk4405dFM2nC8QbnU1TuW9bs8DTbMa9yic9mTz8vmGK7+TFYq11s gwwg== X-Gm-Message-State: AOAM533PR8GN8WZNjGhM+QKR2pMwHLnPn1tFRWJTC4ZiK+gOEZPT/RtH m5Sd8fvxHMzOzumy8stkJKM= X-Google-Smtp-Source: ABdhPJz0Ht2W3NN/AnII61buYrRZgbAx8k4/SwrpaTpWaYlVv8nPqV9cCvl9HmYHcJwCOKWl/JjIKw== X-Received: by 2002:a17:906:6a16:b0:6f4:63ae:76c with SMTP id qw22-20020a1709066a1600b006f463ae076cmr4690738ejc.705.1652456522218; Fri, 13 May 2022 08:42:02 -0700 (PDT) Received: from octofox.metropolis ([178.134.103.46]) by smtp.gmail.com with ESMTPSA id h16-20020a1709066d9000b006f3ef214e73sm848313ejt.217.2022.05.13.08.42.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 May 2022 08:42:01 -0700 (PDT) From: Max Filippov To: linux-xtensa@linux-xtensa.org Cc: Chris Zankel , linux-kernel@vger.kernel.org, Max Filippov Subject: [PATCH 1/2] xtensa: add trap handler for division by zero Date: Fri, 13 May 2022 08:41:50 -0700 Message-Id: <20220513154151.4135905-2-jcmvbkbc@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220513154151.4135905-1-jcmvbkbc@gmail.com> References: <20220513154151.4135905-1-jcmvbkbc@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add c-level handler for the division by zero exception and kill the task if it was thrown from the kernel space or send SIGFPE otherwise. Signed-off-by: Max Filippov --- arch/xtensa/kernel/traps.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index d3e91ceb0775..7c7c4c7b33bb 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -49,6 +49,7 @@ */ static void do_illegal_instruction(struct pt_regs *regs); +static void do_div0(struct pt_regs *regs); static void do_interrupt(struct pt_regs *regs); #if XTENSA_FAKE_NMI static void do_nmi(struct pt_regs *regs); @@ -95,7 +96,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = { #ifdef SUPPORT_WINDOWED { EXCCAUSE_ALLOCA, USER|KRNL, fast_alloca }, #endif -/* EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */ +{ EXCCAUSE_INTEGER_DIVIDE_BY_ZERO, 0, do_div0 }, /* EXCCAUSE_PRIVILEGED unhandled */ #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION #ifdef CONFIG_XTENSA_UNALIGNED_USER @@ -307,6 +308,11 @@ static void do_illegal_instruction(struct pt_regs *regs) force_sig(SIGILL); } +static void do_div0(struct pt_regs *regs) +{ + __die_if_kernel("Unhandled division by 0 in kernel", regs, SIGKILL); + force_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)regs->pc); +} /* * Handle unaligned memory accesses from user space. Kill task. -- 2.30.2