From patchwork Tue Sep 1 08:50:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roman Bolshakov X-Patchwork-Id: 11747677 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BB8D81575 for ; Tue, 1 Sep 2020 08:51:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C09620866 for ; Tue, 1 Sep 2020 08:51:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="YWiBE6Vx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727962AbgIAIvO (ORCPT ); Tue, 1 Sep 2020 04:51:14 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:55040 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727929AbgIAIvK (ORCPT ); Tue, 1 Sep 2020 04:51:10 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 8BCC5574F5; Tue, 1 Sep 2020 08:51:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1598950267; x=1600764668; bh=Ae7UJwA1NRF9KGinIXmBf8CXArSPiyN6yGl /zL36On4=; b=YWiBE6Vx1wu4nENeYSvVRVRzY/PH2abm0F7O8T7cQnEBCHUkol9 +jzaFQafRRRyI4WNRctSBl/A88xBZdo5pjlGOUwG1vPdrFGa88Hmb3iYRXiRVD8C X4dsWvSR4yg+3s7nDIkNavbIg88iWZVK6b+U853uwNaFfYl2004XqytA= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HFe4r6d0F_Wc; Tue, 1 Sep 2020 11:51:07 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 0C17852215; Tue, 1 Sep 2020 11:51:06 +0300 (MSK) Received: from localhost (172.17.204.212) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Tue, 1 Sep 2020 11:51:06 +0300 From: Roman Bolshakov To: CC: Thomas Huth , Paolo Bonzini , Roman Bolshakov , Jim Mattson , Peter Shier , Cameron Esfahani Subject: [kvm-unit-tests PATCH v2 04/10] lib: Bundle debugreg.h from the kernel Date: Tue, 1 Sep 2020 11:50:50 +0300 Message-ID: <20200901085056.33391-5-r.bolshakov@yadro.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901085056.33391-1-r.bolshakov@yadro.com> References: <20200901085056.33391-1-r.bolshakov@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.204.212] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org x86/vmx_tests.c depends on the kernel header and can't be compiled otherwise on x86_64-elf gcc on macOS. Cc: Jim Mattson Cc: Peter Shier Cc: Paolo Bonzini Cc: Cameron Esfahani Reviewed-by: Thomas Huth Signed-off-by: Roman Bolshakov --- lib/x86/asm/debugreg.h | 81 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 lib/x86/asm/debugreg.h diff --git a/lib/x86/asm/debugreg.h b/lib/x86/asm/debugreg.h new file mode 100644 index 0000000..d95d080 --- /dev/null +++ b/lib/x86/asm/debugreg.h @@ -0,0 +1,81 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_ASM_X86_DEBUGREG_H +#define _UAPI_ASM_X86_DEBUGREG_H + + +/* Indicate the register numbers for a number of the specific + debug registers. Registers 0-3 contain the addresses we wish to trap on */ +#define DR_FIRSTADDR 0 /* u_debugreg[DR_FIRSTADDR] */ +#define DR_LASTADDR 3 /* u_debugreg[DR_LASTADDR] */ + +#define DR_STATUS 6 /* u_debugreg[DR_STATUS] */ +#define DR_CONTROL 7 /* u_debugreg[DR_CONTROL] */ + +/* Define a few things for the status register. We can use this to determine + which debugging register was responsible for the trap. The other bits + are either reserved or not of interest to us. */ + +/* Define reserved bits in DR6 which are always set to 1 */ +#define DR6_RESERVED (0xFFFF0FF0) + +#define DR_TRAP0 (0x1) /* db0 */ +#define DR_TRAP1 (0x2) /* db1 */ +#define DR_TRAP2 (0x4) /* db2 */ +#define DR_TRAP3 (0x8) /* db3 */ +#define DR_TRAP_BITS (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3) + +#define DR_STEP (0x4000) /* single-step */ +#define DR_SWITCH (0x8000) /* task switch */ + +/* Now define a bunch of things for manipulating the control register. + The top two bytes of the control register consist of 4 fields of 4 + bits - each field corresponds to one of the four debug registers, + and indicates what types of access we trap on, and how large the data + field is that we are looking at */ + +#define DR_CONTROL_SHIFT 16 /* Skip this many bits in ctl register */ +#define DR_CONTROL_SIZE 4 /* 4 control bits per register */ + +#define DR_RW_EXECUTE (0x0) /* Settings for the access types to trap on */ +#define DR_RW_WRITE (0x1) +#define DR_RW_READ (0x3) + +#define DR_LEN_1 (0x0) /* Settings for data length to trap on */ +#define DR_LEN_2 (0x4) +#define DR_LEN_4 (0xC) +#define DR_LEN_8 (0x8) + +/* The low byte to the control register determine which registers are + enabled. There are 4 fields of two bits. One bit is "local", meaning + that the processor will reset the bit after a task switch and the other + is global meaning that we have to explicitly reset the bit. With linux, + you can use either one, since we explicitly zero the register when we enter + kernel mode. */ + +#define DR_LOCAL_ENABLE_SHIFT 0 /* Extra shift to the local enable bit */ +#define DR_GLOBAL_ENABLE_SHIFT 1 /* Extra shift to the global enable bit */ +#define DR_LOCAL_ENABLE (0x1) /* Local enable for reg 0 */ +#define DR_GLOBAL_ENABLE (0x2) /* Global enable for reg 0 */ +#define DR_ENABLE_SIZE 2 /* 2 enable bits per register */ + +#define DR_LOCAL_ENABLE_MASK (0x55) /* Set local bits for all 4 regs */ +#define DR_GLOBAL_ENABLE_MASK (0xAA) /* Set global bits for all 4 regs */ + +/* The second byte to the control register has a few special things. + We can slow the instruction pipeline for instructions coming via the + gdt or the ldt if we want to. I am not sure why this is an advantage */ + +#ifdef __i386__ +#define DR_CONTROL_RESERVED (0xFC00) /* Reserved by Intel */ +#else +#define DR_CONTROL_RESERVED (0xFFFFFFFF0000FC00UL) /* Reserved */ +#endif + +#define DR_LOCAL_SLOWDOWN (0x100) /* Local slow the pipeline */ +#define DR_GLOBAL_SLOWDOWN (0x200) /* Global slow the pipeline */ + +/* + * HW breakpoint additions + */ + +#endif /* _UAPI_ASM_X86_DEBUGREG_H */