From patchwork Tue Sep 26 11:04:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikhail Abakumov X-Patchwork-Id: 818541 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3y1dXv39pdz9tXP for ; Tue, 26 Sep 2017 21:10:37 +1000 (AEST) Received: from localhost ([::1]:46710 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dwnl4-0007iQ-OE for incoming@patchwork.ozlabs.org; Tue, 26 Sep 2017 07:10:34 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59039) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dwnfg-0003Tk-5y for qemu-devel@nongnu.org; Tue, 26 Sep 2017 07:05:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dwnff-0000Ly-96 for qemu-devel@nongnu.org; Tue, 26 Sep 2017 07:05:00 -0400 Received: from mail.ispras.ru ([83.149.199.45]:51786) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dwnff-0000Lp-2L for qemu-devel@nongnu.org; Tue, 26 Sep 2017 07:04:59 -0400 Received: from Misha-PC.lan02.inno (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 515F054009A; Tue, 26 Sep 2017 14:04:58 +0300 (MSK) From: Mihail Abakumov To: qemu-devel@nongnu.org Date: Tue, 26 Sep 2017 14:04:57 +0300 Message-ID: <150642389679.3900.2803313967054050497.stgit@Misha-PC.lan02.inno> In-Reply-To: <150642384156.3900.3326424823772221077.stgit@Misha-PC.lan02.inno> References: <150642384156.3900.3326424823772221077.stgit@Misha-PC.lan02.inno> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH 09/43] windbg: handler of fs/gs register X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sw@weilnetz.de, lprosek@redhat.com, dovgaluk@ispras.ru, rkagan@virtuozzo.com, pbonzini@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Added handler of fs/gs register. It tries to find and check KPCR and version address. Signed-off-by: Mihail Abakumov Signed-off-by: Pavel Dovgalyuk Signed-off-by: Dmitriy Koltunov --- include/exec/windbgstub-utils.h | 5 +++ windbgstub-utils.c | 63 ++++++++++++++++++++++++++++++++++++++- 2 files changed, 66 insertions(+), 2 deletions(-) diff --git a/include/exec/windbgstub-utils.h b/include/exec/windbgstub-utils.h index 90fb766839..f2402ebb34 100755 --- a/include/exec/windbgstub-utils.h +++ b/include/exec/windbgstub-utils.h @@ -62,6 +62,11 @@ _t; \ }) +typedef struct InitedAddr { + target_ulong addr; + bool is_init; +} InitedAddr; + bool windbg_on_load(void); void windbg_on_exit(void); diff --git a/windbgstub-utils.c b/windbgstub-utils.c index b5fb6db3f2..662096647e 100755 --- a/windbgstub-utils.c +++ b/windbgstub-utils.c @@ -11,10 +11,69 @@ #include "exec/windbgstub-utils.h" +#ifdef TARGET_X86_64 +# define OFFSET_SELF_PCR 0x18 +# define OFFSET_VERS 0x108 +#else +# define OFFSET_SELF_PCR 0x1C +# define OFFSET_VERS 0x34 +#endif + +typedef struct KDData { + InitedAddr KPCR; + InitedAddr version; +} KDData; + +static KDData *kd; + bool windbg_on_load(void) { - return false; + CPUState *cpu = qemu_get_cpu(0); + CPUArchState *env = cpu->env_ptr; + + if (!kd) { + kd = g_new0(KDData, 1); + } + + if (!kd->KPCR.is_init) { + + #ifdef TARGET_X86_64 + kd->KPCR.addr = env->segs[R_GS].base; + #else + kd->KPCR.addr = env->segs[R_FS].base; + #endif + + static target_ulong prev_KPCR; + if (!kd->KPCR.addr || prev_KPCR == kd->KPCR.addr) { + return false; + } + prev_KPCR = kd->KPCR.addr; + + if (kd->KPCR.addr != READ_VMEM(cpu, kd->KPCR.addr + OFFSET_SELF_PCR, + target_ulong)) { + return false; + } + + kd->KPCR.is_init = true; + } + + if (!kd->version.is_init && kd->KPCR.is_init) { + kd->version.addr = READ_VMEM(cpu, kd->KPCR.addr + OFFSET_VERS, + target_ulong); + if (!kd->version.addr) { + return false; + } + kd->version.is_init = true; + } + + WINDBG_DEBUG("windbg_on_load: KPCR " FMT_ADDR, kd->KPCR.addr); + WINDBG_DEBUG("windbg_on_load: version " FMT_ADDR, kd->version.addr); + + return true; } void windbg_on_exit(void) -{} +{ + g_free(kd); + kd = NULL; +}