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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2F37C06511 for ; Wed, 3 Jul 2019 10:28:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CBDBA218A6 for ; Wed, 3 Jul 2019 10:28:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="tUwrWvnL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727110AbfGCK2u (ORCPT ); Wed, 3 Jul 2019 06:28:50 -0400 Received: from merlin.infradead.org ([205.233.59.134]:33224 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725820AbfGCK2s (ORCPT ); Wed, 3 Jul 2019 06:28:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=From:Content-Type:MIME-Version: References:Subject:Cc:To:Date:Message-Id:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner: List-Archive; bh=iVBwZmLYwKyzqu2qXp0eR/vORHeEgKn3hMY8ooPCZtM=; b=tUwrWvnL8bDP Kk5cmTh6C1IhEomhcUmf/5EKZy+Rsn2/C91qIQs1SMKtuP5jlwMj/LXZJsVYA63HaH6vqrJ/X+E/k V1LRPz9fka2Wy+u8zo07qN8DVlE4lIH/8GxQAyT+VaYz62gse6b43qg5HUS3c3fXdl1eScDAAXwk6 6XdKSliIhiYjSE4KVA6yim/ZRFodjYIr3l2LwAHn3C7GB+QdzzApWJeO+xX3iJLxlvf3fHnB+N7hz sYR9ec/KSn9UJ/nqTnIA9XUVMwvuPO1GAzSrYzE0iTE5ee4f/af9HYzdm+yF6jgMAaeRkltQY/4RL oxpdVpeXApvszwJPQ2wWWw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hicV2-0006Fb-A7; Wed, 03 Jul 2019 10:28:28 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id C3FF5202173E0; Wed, 3 Jul 2019 12:28:25 +0200 (CEST) Message-Id: <20190703102807.532454315@infradead.org> User-Agent: quilt/0.65 Date: Wed, 03 Jul 2019 12:27:33 +0200 To: tglx@linutronix.de, bp@alien8.de, mingo@kernel.org, rostedt@goodmis.org, luto@kernel.org, torvalds@linux-foundation.org Cc: hpa@zytor.com, dave.hansen@linux.intel.com, jgross@suse.com, linux-kernel@vger.kernel.org, zhe.he@windriver.com, joel@joelfernandes.org, devel@etsukata.com, peterz@infradead.org Subject: [PATCH 2/3] x86/entry/32: Simplify common_exception References: <20190703102731.236024951@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 From: root Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org By adding one more option to SAVE_ALL we can make use of it in common_exception and simplify things. This saves duplication later where page_fault will no longer use common_exception. Signed-off-by: Peter Zijlstra (Intel) --- arch/x86/entry/entry_32.S | 36 +++++++++++++----------------------- 1 file changed, 13 insertions(+), 23 deletions(-) --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -294,9 +294,11 @@ .Lfinished_frame_\@: .endm -.macro SAVE_ALL pt_regs_ax=%eax switch_stacks=0 +.macro SAVE_ALL pt_regs_ax=%eax switch_stacks=0 skip_gs=0 cld +.if \skip_gs == 0 PUSH_GS +.endif FIXUP_FRAME pushl %fs pushl %es @@ -313,13 +315,13 @@ movl %edx, %es movl $(__KERNEL_PERCPU), %edx movl %edx, %fs +.if \skip_gs == 0 SET_KERNEL_GS %edx - +.endif /* Switch to kernel stack if necessary */ .if \switch_stacks > 0 SWITCH_TO_KERNEL_STACK .endif - .endm .macro SAVE_ALL_NMI cr3_reg:req @@ -1448,32 +1450,20 @@ END(page_fault) common_exception: /* the function address is in %gs's slot on the stack */ - FIXUP_FRAME - pushl %fs - pushl %es - pushl %ds - pushl %eax - movl $(__USER_DS), %eax - movl %eax, %ds - movl %eax, %es - movl $(__KERNEL_PERCPU), %eax - movl %eax, %fs - pushl %ebp - pushl %edi - pushl %esi - pushl %edx - pushl %ecx - pushl %ebx - SWITCH_TO_KERNEL_STACK + SAVE_ALL switch_stacks=1 skip_gs=1 ENCODE_FRAME_POINTER - cld UNWIND_ESPFIX_STACK + + /* fixup %gs */ GS_TO_REG %ecx movl PT_GS(%esp), %edi # get the function address - movl PT_ORIG_EAX(%esp), %edx # get the error code - movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart REG_TO_PTGS %ecx SET_KERNEL_GS %ecx + + /* fixup orig %eax */ + movl PT_ORIG_EAX(%esp), %edx # get the error code + movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart + TRACE_IRQS_OFF movl %esp, %eax # pt_regs pointer CALL_NOSPEC %edi