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=-12.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=unavailable 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 20756C2D0A3 for ; Mon, 9 Nov 2020 11:22:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 99DBD206ED for ; Mon, 9 Nov 2020 11:22:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="v85qIcin" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729559AbgKILWI (ORCPT ); Mon, 9 Nov 2020 06:22:08 -0500 Received: from aserp2120.oracle.com ([141.146.126.78]:56462 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729146AbgKILWH (ORCPT ); Mon, 9 Nov 2020 06:22:07 -0500 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0A9BETlu023354; Mon, 9 Nov 2020 11:21:19 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=moHBvZsazE1U6yuvOGkS2t8B1QK80Cp4bKlBuUCXKfI=; b=v85qIcineTcrAg+DWee3BRlHJdX2P5HNQPtFwX7edVsG5+0CnSJ25uf+WJIgMkG7JSX1 r1gTGy1fcGrSoD6le0eokRRaImrCCvFcEtpwJp49Ds1Y+bIJbgkZk2wwubAeSnpyT3/C MxjcUISO6qgR3J5YWV/QET+8kiyQ7ssLm5DclxhAhSJe6U8JQIXcqpVqOOkrPvWCqr7j kcATSTPxcdV8nHobJt8czvHNe7OXEQPpe0305d1uju3+P+bVsje+Vah7KWxAejY5Pg36 p82qUtXXWRdl6xbxHkPiNCH1pIwcl5pqIdseWKDPc4jRqOhmOOWWu867ekRF7y1cTzi0 QQ== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2120.oracle.com with ESMTP id 34nkhknd1d-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 09 Nov 2020 11:21:19 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0A9BL90u177805; Mon, 9 Nov 2020 11:21:18 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 34p55ku18p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 09 Nov 2020 11:21:18 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0A9BLC91014684; Mon, 9 Nov 2020 11:21:14 GMT Received: from linux.home (/92.157.91.83) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 09 Nov 2020 03:21:12 -0800 From: Alexandre Chartre To: "tglx@linutronix.de"@aserv0122.oracle.com, "mingo@redhat.com"@aserv0122.oracle.com, "bp@alien8.de"@aserv0122.oracle.com, "hpa@zytor.com"@aserv0122.oracle.com, "x86@kernel.org"@aserv0122.oracle.com, "dave.hansen@linux.intel.com"@aserv0122.oracle.com, "luto@kernel.org"@aserv0122.oracle.com, "peterz@infradead.org"@aserv0122.oracle.com, "linux-kernel@vger.kernel.org"@aserv0122.oracle.com, "thomas.lendacky@amd.com"@aserv0122.oracle.com, "jroedel@suse.de"@aserv0122.oracle.com Cc: "konrad.wilk@oracle.com"@aserv0122.oracle.com, "jan.setjeeilers@oracle.com"@aserv0122.oracle.com, "junaids@google.com"@aserv0122.oracle.com, "oweisse@google.com"@aserv0122.oracle.com, "rppt@linux.vnet.ibm.com"@aserv0122.oracle.com, "graf@amazon.de"@aserv0122.oracle.com, "mgross@linux.intel.com"@aserv0122.oracle.com, "kuzuno@gmail.com"@aserv0122.oracle.com, "alexandre.chartre@oracle.com"@aserv0122.oracle.com Subject: [RFC][PATCH 01/24] x86/syscall: Add wrapper for invoking syscall function Date: Mon, 9 Nov 2020 12:22:56 +0100 Message-Id: <20201109112319.264511-2-alexandre.chartre@oracle.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20201109112319.264511-1-alexandre.chartre@oracle.com> References: <20201109112319.264511-1-alexandre.chartre@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9799 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 spamscore=0 phishscore=0 mlxlogscore=999 mlxscore=0 malwarescore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011090075 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9799 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 priorityscore=1501 mlxscore=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 spamscore=0 malwarescore=0 adultscore=0 clxscore=1011 bulkscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011090074 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a wrapper function for invoking a syscall function. Signed-off-by: Alexandre Chartre --- arch/x86/entry/common.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 870efeec8bda..d222212908ad 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -35,6 +35,15 @@ #include #include +static __always_inline void run_syscall(sys_call_ptr_t sysfunc, + struct pt_regs *regs) +{ + if (!sysfunc) + return; + + regs->ax = sysfunc(regs); +} + #ifdef CONFIG_X86_64 __visible noinstr void do_syscall_64(unsigned long nr, struct pt_regs *regs) { @@ -43,15 +52,16 @@ __visible noinstr void do_syscall_64(unsigned long nr, struct pt_regs *regs) instrumentation_begin(); if (likely(nr < NR_syscalls)) { nr = array_index_nospec(nr, NR_syscalls); - regs->ax = sys_call_table[nr](regs); + run_syscall(sys_call_table[nr], regs); #ifdef CONFIG_X86_X32_ABI } else if (likely((nr & __X32_SYSCALL_BIT) && (nr & ~__X32_SYSCALL_BIT) < X32_NR_syscalls)) { nr = array_index_nospec(nr & ~__X32_SYSCALL_BIT, X32_NR_syscalls); - regs->ax = x32_sys_call_table[nr](regs); + run_syscall(x32_sys_call_table[nr], regs); #endif } + instrumentation_end(); syscall_exit_to_user_mode(regs); } @@ -75,7 +85,7 @@ static __always_inline void do_syscall_32_irqs_on(struct pt_regs *regs, if (likely(nr < IA32_NR_syscalls)) { instrumentation_begin(); nr = array_index_nospec(nr, IA32_NR_syscalls); - regs->ax = ia32_sys_call_table[nr](regs); + run_syscall(ia32_sys_call_table[nr], regs); instrumentation_end(); } } -- 2.18.4