From patchwork Mon Jan 16 07:38:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= X-Patchwork-Id: 13102700 X-Patchwork-Delegate: palmer@dabbelt.com 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 339B5C67871 for ; Mon, 16 Jan 2023 07:39:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cH29CeFPGCZe4mtlPCg0mEooeQmThHwDVcHdc1jwCyA=; b=1lo/d9FZOaVTBb LZL4ezSPnBy6S/Z4bmuUpLldqAY/ppgKcbwFUtruqG9Lhh6BxYDN5WjWuUcvUa5gk1Osw3TUMJme8 p8jRzfy2MEa4plSVkasdQ5OEUNM6G2LBoZcx6ovzGX+IMm00brlSPCgMmw7zgUzkR+yO1mbGktTeo h5EnJwGJcmj50r+F+vnlZ+gaezCkKotgVDPMR4wM6HdFW2iPkHb+pZO4FAakILYIFaupsyKZJIGk4 Q3enbt+hs4Q7F7TWTCHZpAgdr5850Zg4Vnn3fqHeIRpkFFvCaAuFhGD5TNSHxuRtsl+0tVL2XMAtk L9nqjUiL9wqPvi6Oe1qg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pHK5B-0090l2-BC; Mon, 16 Jan 2023 07:39:05 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pHK57-0090jE-1a for linux-riscv@lists.infradead.org; Mon, 16 Jan 2023 07:39:03 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id D62C6B80D59; Mon, 16 Jan 2023 07:38:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB0CAC433F0; Mon, 16 Jan 2023 07:38:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1673854737; bh=GRifVG8QQU3bI8YFwJPVwBl3vn/mY1G/0lBs8bIH0oI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=em9uypzzHGPvaNWOz7teN9KlBmzxP3upD3xcgjrQ7YYhMhdRamJWXJHaM/kQ0spLe MLY9n7CUhvc/zwYxxk2uktB+paiXu/SAyOH0m1OE1eCU0ObNQBjaXbu594R0P1lbby xZ1SLHwcK1gmlf5re16DScRSe8cJLKZLeelsCA9/ao6OcPVBf5hfsWnvf0Kgz/H/4K hWNGBn+HGpsWiV3EroSE1cA7s0rxjaokTnCdpnYagBZ/1WWqSuStoNwH3FwSu6oR6z c+gC2WCXU5eqFQR0Ru8zPEWq1hrDJVsVbZjK+QGZC1VPApdZ31XxYlos24ihjler2s V5/BK0vsMKPOA== From: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= To: Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Cc: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Andreas Schwab , linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] riscv: Add instruction dump to RISC-V splats Date: Mon, 16 Jan 2023 08:38:33 +0100 Message-Id: <20230116073834.333129-2-bjorn@kernel.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230116073834.333129-1-bjorn@kernel.org> References: <20230116073834.333129-1-bjorn@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230115_233901_416584_A9AB119A X-CRM114-Status: GOOD ( 15.18 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Björn Töpel Add instruction dump (Code:) output to RISC-V splats. Dump 16b parcels. An example: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Oops [#1] Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.2.0-rc3-00302-g840ff44c571d-dirty #27 Hardware name: riscv-virtio,qemu (DT) epc : kernel_init+0xc8/0x10e ra : kernel_init+0x70/0x10e epc : ffffffff80bd9a40 ra : ffffffff80bd99e8 sp : ff2000000060bec0 gp : ffffffff81730b28 tp : ff6000007ff00000 t0 : 7974697275636573 t1 : 0000000000000000 t2 : 3030303270393d6e s0 : ff2000000060bee0 s1 : ffffffff81732028 a0 : 0000000000000000 a1 : ff60000080dd1780 a2 : 0000000000000002 a3 : ffffffff8176a470 a4 : 0000000000000000 a5 : 000000000000000a a6 : 0000000000000081 a7 : ff60000080dd1780 s2 : 0000000000000000 s3 : 0000000000000000 s4 : 0000000000000000 s5 : 0000000000000000 s6 : 0000000000000000 s7 : 0000000000000000 s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000000000000000 s11: 0000000000000000 t3 : ffffffff81186018 t4 : 0000000000000022 t5 : 000000000000003d t6 : 0000000000000000 status: 0000000200000120 badaddr: 0000000000000000 cause: 000000000000000f [] ret_from_exception+0x0/0x16 Code: 862a d179 608c a517 0069 0513 2be5 d0ef db2e 47a9 (c11c) a517 ---[ end trace 0000000000000000 ]--- Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b SMP: stopping secondary CPUs ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]--- Signed-off-by: Björn Töpel --- arch/riscv/kernel/traps.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 549bde5c970a..b8f0ea8a9568 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -29,6 +29,27 @@ int show_unhandled_signals = 1; static DEFINE_SPINLOCK(die_lock); +static void dump_kernel_instr(const char *loglvl, struct pt_regs *regs) +{ + char str[sizeof("0000 ") * 12 + 2 + 1], *p = str; + unsigned long addr = regs->epc; + long bad; + u16 val; + int i; + + for (i = -10; i < 2; i++) { + bad = get_kernel_nofault(val, &((u16 *)addr)[i]); + if (!bad) { + p += sprintf(p, i == 0 ? "(%04hx) " : "%04hx ", val); + } else { + printk("%sCode: Unable to access instruction at 0x%lx.\n", + loglvl, (long)&((u16 *)addr)[i]); + return; + } + } + printk("%sCode: %s\n", loglvl, str); +} + void die(struct pt_regs *regs, const char *str) { static int die_counter; @@ -43,8 +64,10 @@ void die(struct pt_regs *regs, const char *str) pr_emerg("%s [#%d]\n", str, ++die_counter); print_modules(); - if (regs) + if (regs) { show_regs(regs); + dump_kernel_instr(KERN_EMERG, regs); + } cause = regs ? regs->cause : -1; ret = notify_die(DIE_OOPS, str, regs, 0, cause, SIGSEGV);