From nobody Tue Feb 10 20:14:26 2026 Delivered-To: importer@patchew.org Received-SPF: temperror (zoho.com: Error in retrieving data from DNS) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=temperror (zoho.com: Error in retrieving data from DNS) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1508245935645540.9829805433618; Tue, 17 Oct 2017 06:12:15 -0700 (PDT) Received: from localhost ([::1]:39142 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e4Rf5-0004XU-QO for importer@patchew.org; Tue, 17 Oct 2017 09:11:59 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33079) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e4Rd0-00038f-2Q for qemu-devel@nongnu.org; Tue, 17 Oct 2017 09:09:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e4Rcv-0004ws-Ea for qemu-devel@nongnu.org; Tue, 17 Oct 2017 09:09:50 -0400 Received: from mail.ispras.ru ([83.149.199.45]:56612) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e4Rcv-0004w8-1L for qemu-devel@nongnu.org; Tue, 17 Oct 2017 09:09:45 -0400 Received: from Misha-PC.lan02.inno (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id E523054006B; Tue, 17 Oct 2017 16:09:43 +0300 (MSK) From: Mihail Abakumov To: qemu-devel@nongnu.org Date: Tue, 17 Oct 2017 16:09:41 +0300 Message-ID: <150824578138.6816.8943744353407171634.stgit@Misha-PC.lan02.inno> In-Reply-To: <150824572545.6816.5099701189660002212.stgit@Misha-PC.lan02.inno> References: <150824572545.6816.5099701189660002212.stgit@Misha-PC.lan02.inno> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v2 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_6 Z_629925259 SPT_0 Added handler of fs/gs register. It tries to find and check KPCR and versio= n address. Signed-off-by: Mihail Abakumov Signed-off-by: Pavel Dovgalyuk Signed-off-by: Dmitriy Koltunov --- include/exec/windbgstub-utils.h | 8 ++++++ target/i386/windbgstub.c | 49 +++++++++++++++++++++++++++++++++++= +++- windbgstub-utils.c | 13 ++++++++++ windbgstub.c | 10 ++++++++ 4 files changed, 79 insertions(+), 1 deletion(-) diff --git a/include/exec/windbgstub-utils.h b/include/exec/windbgstub-util= s.h index 825d58b76b..ff260287dc 100755 --- a/include/exec/windbgstub-utils.h +++ b/include/exec/windbgstub-utils.h @@ -50,6 +50,14 @@ _t; \ }) =20 +typedef struct InitedAddr { + target_ulong addr; + bool is_init; +} InitedAddr; + +InitedAddr *windbg_get_KPCR(void); +InitedAddr *windbg_get_version(void); + bool windbg_on_load(void); =20 #endif diff --git a/target/i386/windbgstub.c b/target/i386/windbgstub.c index f2f83423a0..83e80bdfc8 100755 --- a/target/i386/windbgstub.c +++ b/target/i386/windbgstub.c @@ -12,7 +12,54 @@ #include "qemu/osdep.h" #include "exec/windbgstub-utils.h" =20 +#ifdef TARGET_X86_64 +# define OFFSET_SELF_PCR 0x18 +# define OFFSET_VERS 0x108 +#else +# define OFFSET_SELF_PCR 0x1C +# define OFFSET_VERS 0x34 +#endif + bool windbg_on_load(void) { - return false; + CPUState *cpu =3D qemu_get_cpu(0); + CPUArchState *env =3D cpu->env_ptr; + InitedAddr *KPCR =3D windbg_get_KPCR(); + InitedAddr *version =3D windbg_get_version(); + + if (!KPCR->is_init) { + + #ifdef TARGET_X86_64 + KPCR->addr =3D env->segs[R_GS].base; + #else + KPCR->addr =3D env->segs[R_FS].base; + #endif + + static target_ulong prev_KPCR; + if (!KPCR->addr || prev_KPCR =3D=3D KPCR->addr) { + return false; + } + prev_KPCR =3D KPCR->addr; + + if (KPCR->addr !=3D READ_VMEM(cpu, KPCR->addr + OFFSET_SELF_PCR, + target_ulong)) { + return false; + } + + KPCR->is_init =3D true; + } + + if (!version->is_init && KPCR->is_init) { + version->addr =3D READ_VMEM(cpu, KPCR->addr + OFFSET_VERS, + target_ulong); + if (!version->addr) { + return false; + } + version->is_init =3D true; + } + + WINDBG_DEBUG("windbg_on_load: KPCR " FMT_ADDR, KPCR->addr); + WINDBG_DEBUG("windbg_on_load: version " FMT_ADDR, version->addr); + + return true; } diff --git a/windbgstub-utils.c b/windbgstub-utils.c index dc5e505c63..347c61553a 100755 --- a/windbgstub-utils.c +++ b/windbgstub-utils.c @@ -10,3 +10,16 @@ */ =20 #include "exec/windbgstub-utils.h" + +static InitedAddr KPCR; +static InitedAddr version; + +InitedAddr *windbg_get_KPCR(void) +{ + return &KPCR; +} + +InitedAddr *windbg_get_version(void) +{ + return &version; +} diff --git a/windbgstub.c b/windbgstub.c index a2a6eb81b4..e9aabd807b 100755 --- a/windbgstub.c +++ b/windbgstub.c @@ -17,6 +17,7 @@ #include "exec/windbgstub.h" #include "exec/windbgstub-utils.h" #include "sysemu/kvm.h" +#include "sysemu/reset.h" =20 typedef struct WindbgState { bool is_loaded; @@ -46,6 +47,13 @@ static void windbg_exit(void) g_free(windbg_state); } =20 +static void windbg_handle_reset(void *opaque) +{ + windbg_state->is_loaded =3D false; + windbg_get_KPCR()->is_init =3D false; + windbg_get_version()->is_init =3D false; +} + void windbg_try_load(void) { if (windbg_state && !windbg_state->is_loaded) { @@ -85,6 +93,8 @@ int windbg_server_start(const char *device) qemu_chr_fe_set_handlers(&windbg_state->chr, windbg_chr_can_receive, windbg_chr_receive, NULL, NULL, NULL, NULL, t= rue); =20 + qemu_register_reset(windbg_handle_reset, NULL); + atexit(windbg_exit); return 0; }