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=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 419CCC4BA06 for ; Tue, 25 Feb 2020 23:27:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1FA9124680 for ; Tue, 25 Feb 2020 23:27:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730696AbgBYX1V (ORCPT ); Tue, 25 Feb 2020 18:27:21 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:56039 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730530AbgBYX1D (ORCPT ); Tue, 25 Feb 2020 18:27:03 -0500 Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1j6jai-0004wQ-3M; Wed, 26 Feb 2020 00:26:16 +0100 Received: from nanos.tec.linutronix.de (localhost [IPv6:::1]) by nanos.tec.linutronix.de (Postfix) with ESMTP id 345E91040B2; Wed, 26 Feb 2020 00:25:46 +0100 (CET) Message-Id: <20200225224145.020876774@linutronix.de> User-Agent: quilt/0.65 Date: Tue, 25 Feb 2020 23:33:30 +0100 From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Steven Rostedt , Brian Gerst , Juergen Gross , Paolo Bonzini , Arnd Bergmann Subject: [patch 09/16] x86/entry: Provide IDTENTRY_DF References: <20200225223321.231477305@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provide a separate macro for #DF as this needs to emit paranoid only code and has also a special ASM stub in 32bit. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/idtentry.h | 82 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -160,10 +160,85 @@ static __always_inline void __##func(str #define DEFINE_IDTENTRY_NOIST(func) \ DEFINE_IDTENTRY(noist_##func) +/** + * DECLARE_IDTENTRY_DF - Declare functions for double fault + * @vector: Vector number (ignored for C) + * @func: Function name of the entry point + * + * Maps to DECLARE_IDTENTRY_ERRORCODE + */ +#define DECLARE_IDTENTRY_DF(vector, func) \ + DECLARE_IDTENTRY_ERRORCODE(vector, func) + +/** + * DEFINE_IDTENTRY_DF - Emit code for double fault + * @func: Function name of the entry point + * + * @func is called from ASM entry code with interrupts disabled. + */ +#define DEFINE_IDTENTRY_DF(func) \ +static __always_inline void __##func(struct pt_regs *regs, \ + unsigned long error_code, \ + unsigned long address); \ + \ +__visible notrace void func(struct pt_regs *regs, \ + unsigned long error_code) \ +{ \ + unsigned long address = read_cr2(); \ + \ + trace_hardirqs_off(); \ + __##func (regs, error_code, address); \ +} \ +NOKPROBE_SYMBOL(func); \ + \ +static __always_inline void __##func(struct pt_regs *regs, \ + unsigned long error_code, \ + unsigned long address) + #else /* CONFIG_X86_64 */ /* Maps to a regular IDTENTRY on 32bit for now */ # define DECLARE_IDTENTRY_IST DECLARE_IDTENTRY # define DEFINE_IDTENTRY_IST DEFINE_IDTENTRY + +/** + * DECLARE_IDTENTRY_DF - Declare functions for double fault 32bit variant + * @vector: Vector number (ignored for C) + * @func: Function name of the entry point + * + * Declares three functions: + * - The ASM entry point: asm_##func + * - The C handler called from the C shim + */ +#define DECLARE_IDTENTRY_DF(vector, func) \ + asmlinkage void asm_##func(void); \ + __visible void func(struct pt_regs *regs, \ + unsigned long error_code, \ + unsigned long address) + +/** + * DEFINE_IDTENTRY_DF - Emit code for double fault on 32bit + * @func: Function name of the entry point + * + * This is called through the doublefault shim which already provides + * cr2 in the address argument. + */ +#define DEFINE_IDTENTRY_DF(func) \ +static __always_inline void __##func(struct pt_regs *regs, \ + unsigned long error_code, \ + unsigned long address); \ + \ +__visible notrace void func(struct pt_regs *regs, \ + unsigned long error_code, \ + unsigned long address) \ +{ \ + __##func (regs, error_code, address); \ +} \ +NOKPROBE_SYMBOL(func); \ + \ +static __always_inline void __##func(struct pt_regs *regs, \ + unsigned long error_code, \ + unsigned long address) + #endif /* !CONFIG_X86_64 */ /* C-Code mapping */ @@ -209,12 +284,19 @@ static __always_inline void __##func(str # define DECLARE_IDTENTRY_DEBUG(vector, func) \ idtentry_mce_db vector asm_##func func +# define DECLARE_IDTENTRY_DF(vector, func) \ + idtentry_df vector asm_##func func + #else # define DECLARE_IDTENTRY_MCE(vector, func) \ DECLARE_IDTENTRY(vector, func) # define DECLARE_IDTENTRY_DEBUG(vector, func) \ DECLARE_IDTENTRY(vector, func) + +/* No ASM emitted for DF as this goes through a C shim */ +# define DECLARE_IDTENTRY_DF(vector, func) + #endif /* No ASM code emitted for NMI */