From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262110AbVDLTni (ORCPT ); Tue, 12 Apr 2005 15:43:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262610AbVDLTnK (ORCPT ); Tue, 12 Apr 2005 15:43:10 -0400 Received: from fire.osdl.org ([65.172.181.4]:65480 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S262110AbVDLKcD (ORCPT ); Tue, 12 Apr 2005 06:32:03 -0400 Message-Id: <200504121031.j3CAVs8E005443@shell0.pdx.osdl.net> Subject: [patch 079/198] x86_64: Fix interaction of single stepping with debuggers To: torvalds@osdl.org Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, ak@suse.de From: akpm@osdl.org Date: Tue, 12 Apr 2005 03:31:48 -0700 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: "Andi Kleen" Ported from i386/Linus Fix another TF corner case. Need to do the special TF handling for all signals to make debuggers happy Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton --- 25-akpm/arch/x86_64/kernel/signal.c | 12 ++++++++++++ 1 files changed, 12 insertions(+) diff -puN arch/x86_64/kernel/signal.c~x86_64-fix-interaction-of-single-stepping-with-debuggers arch/x86_64/kernel/signal.c --- 25/arch/x86_64/kernel/signal.c~x86_64-fix-interaction-of-single-stepping-with-debuggers 2005-04-12 03:21:22.220758832 -0700 +++ 25-akpm/arch/x86_64/kernel/signal.c 2005-04-12 03:21:22.223758376 -0700 @@ -368,6 +368,18 @@ handle_signal(unsigned long sig, siginfo } } + /* + * If TF is set due to a debugger (PT_DTRACE), clear the TF + * flag so that register information in the sigcontext is + * correct. + */ + if (unlikely(regs->eflags & TF_MASK)) { + if (likely(current->ptrace & PT_DTRACE)) { + current->ptrace &= ~PT_DTRACE; + regs->eflags &= ~TF_MASK; + } + } + #ifdef CONFIG_IA32_EMULATION if (test_thread_flag(TIF_IA32)) { if (ka->sa.sa_flags & SA_SIGINFO) _