From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754606AbcJUHwm (ORCPT ); Fri, 21 Oct 2016 03:52:42 -0400 Received: from terminus.zytor.com ([198.137.202.10]:35380 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932332AbcJUHwi (ORCPT ); Fri, 21 Oct 2016 03:52:38 -0400 Date: Fri, 21 Oct 2016 00:51:48 -0700 From: tip-bot for Josh Poimboeuf Message-ID: Cc: peterz@infradead.org, hpa@zytor.com, torvalds@linux-foundation.org, bp@alien8.de, jpoimboe@redhat.com, luto@kernel.org, linux-kernel@vger.kernel.org, dvlasenk@redhat.com, tglx@linutronix.de, mingo@kernel.org, luto@amacapital.net, brgerst@gmail.com Reply-To: jpoimboe@redhat.com, luto@kernel.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, dvlasenk@redhat.com, luto@amacapital.net, brgerst@gmail.com, mingo@kernel.org, peterz@infradead.org, torvalds@linux-foundation.org, hpa@zytor.com, bp@alien8.de In-Reply-To: <93f0fe0307a4af884d3fca00edabcc8cff236002.1476973742.git.jpoimboe@redhat.com> References: <93f0fe0307a4af884d3fca00edabcc8cff236002.1476973742.git.jpoimboe@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/asm] x86/dumpstack: Print orig_ax in __show_regs() Git-Commit-ID: 6fa81a12b3f1834a22167aa2d7b24dcc4bf884e3 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 6fa81a12b3f1834a22167aa2d7b24dcc4bf884e3 Gitweb: http://git.kernel.org/tip/6fa81a12b3f1834a22167aa2d7b24dcc4bf884e3 Author: Josh Poimboeuf AuthorDate: Thu, 20 Oct 2016 11:34:45 -0500 Committer: Ingo Molnar CommitDate: Fri, 21 Oct 2016 09:26:05 +0200 x86/dumpstack: Print orig_ax in __show_regs() The value of regs->orig_ax contains potentially useful debugging data: For syscalls it contains the syscall number. For interrupts it contains the (negated) vector number. To reduce noise, print it only if it has a useful value (i.e., something other than -1). Here's what it looks like for a write syscall: RIP: 0033:[<00007f53ad7b1940>] 0x7f53ad7b1940 RSP: 002b:00007fff8de66558 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000046 RCX: 00007f53ad7b1940 RDX: 0000000000000002 RSI: 00007f53ae0ca000 RDI: 0000000000000001 ... Suggested-by: Andy Lutomirski Signed-off-by: Josh Poimboeuf Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/93f0fe0307a4af884d3fca00edabcc8cff236002.1476973742.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/process_64.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index b3b50ac..f1c36da 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -63,8 +63,13 @@ void __show_regs(struct pt_regs *regs, int all) printk(KERN_DEFAULT "RIP: %04lx:[<%016lx>] %pS\n", regs->cs & 0xffff, regs->ip, (void *)regs->ip); - printk(KERN_DEFAULT "RSP: %04lx:%016lx EFLAGS: %08lx\n", regs->ss, + printk(KERN_DEFAULT "RSP: %04lx:%016lx EFLAGS: %08lx", regs->ss, regs->sp, regs->flags); + if (regs->orig_ax != -1) + pr_cont(" ORIG_RAX: %016lx\n", regs->orig_ax); + else + pr_cont("\n"); + printk(KERN_DEFAULT "RAX: %016lx RBX: %016lx RCX: %016lx\n", regs->ax, regs->bx, regs->cx); printk(KERN_DEFAULT "RDX: %016lx RSI: %016lx RDI: %016lx\n",