From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752688AbdF1PNV (ORCPT ); Wed, 28 Jun 2017 11:13:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50014 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752755AbdF1PMK (ORCPT ); Wed, 28 Jun 2017 11:12:10 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 18A667A17F Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=jpoimboe@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 18A667A17F From: Josh Poimboeuf To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, Linus Torvalds , Andy Lutomirski , Jiri Slaby , Ingo Molnar , "H. Peter Anvin" , Peter Zijlstra Subject: [PATCH v2 7/8] x86/asm: add unwind hint annotations to sync_core() Date: Wed, 28 Jun 2017 10:11:11 -0500 Message-Id: <7edc88410886572b552dc863e2bed9aa068cf991.1498659915.git.jpoimboe@redhat.com> In-Reply-To: References: X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Wed, 28 Jun 2017 15:12:04 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This enables the undwarf unwinder to grok the iret in the middle of a C function. Signed-off-by: Josh Poimboeuf --- arch/x86/include/asm/processor.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index f3b1b27..465e5e2 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -22,6 +22,7 @@ struct vm86; #include #include #include +#include #include #include @@ -684,6 +685,7 @@ static inline void sync_core(void) unsigned int tmp; asm volatile ( + UNWIND_HINT_SAVE "mov %%ss, %0\n\t" "pushq %q0\n\t" "pushq %%rsp\n\t" @@ -693,6 +695,7 @@ static inline void sync_core(void) "pushq %q0\n\t" "pushq $1f\n\t" "iretq\n\t" + UNWIND_HINT_RESTORE "1:" : "=&r" (tmp), "+r" (__sp) : : "cc", "memory"); #endif -- 2.7.5