From patchwork Tue Oct 19 19:14:36 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?Q?Llu=C3=ADs?= X-Patchwork-Id: 68958 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id CAC781007F6 for ; Sat, 23 Oct 2010 07:16:06 +1100 (EST) Received: from localhost ([127.0.0.1]:57559 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1P9O1y-0002zj-OS for incoming@patchwork.ozlabs.org; Fri, 22 Oct 2010 16:16:02 -0400 Received: from [140.186.70.92] (port=45310 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1P9Mt0-0001qD-Bc for qemu-devel@nongnu.org; Fri, 22 Oct 2010 15:02:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1P9MpI-0005XA-WD for qemu-devel@nongnu.org; Fri, 22 Oct 2010 14:58:54 -0400 Received: from mailout-de.gmx.net ([213.165.64.23]:60391 helo=mail.gmx.net) by eggs.gnu.org with smtp (Exim 4.71) (envelope-from ) id 1P9MpI-0005Wo-LA for qemu-devel@nongnu.org; Fri, 22 Oct 2010 14:58:52 -0400 Received: (qmail invoked by alias); 22 Oct 2010 18:58:50 -0000 Received: from unknown (EHLO localhost) [84.88.53.92] by mail.gmx.net (mp025) with SMTP; 22 Oct 2010 20:58:50 +0200 X-Authenticated: #12333383 X-Provags-ID: V01U2FsdGVkX18MND43UZsMJGTjvArRptvK0vsYnGdvabnCXXo0cU eeEOSm2LrYyM9x From: xscript@gmx.net (=?utf-8?Q?Llu=C3=ADs?=) To: qemu-devel@nongnu.org In-Reply-To: Date: Tue, 19 Oct 2010 21:14:36 +0200 References: Message-Id: <495cba98dfc4cc5c40cc1a572327729d8926c596.1287772676.git.vilanova@ac.upc.edu> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) MIME-Version: 1.0 X-Y-GMX-Trusted: 0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. Subject: [Qemu-devel] [PATCH 05/18] backdoor: [i386] Decode backdoor instructions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Decode backdoor instructions following "backdoor/guest.h" and call the user-defined backdoor helpers. Signed-off-by: Lluís Vilanova --- target-i386/translate.c | 30 ++++++++++++++++++++++++++++++ 1 files changed, 30 insertions(+), 0 deletions(-) diff --git a/target-i386/translate.c b/target-i386/translate.c index 7b6e3c2..b54a823 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -4105,6 +4105,31 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start) x86_64_hregs = 0; #endif s->rip_offset = 0; /* for relative ip address */ + +#if defined(CONFIG_BACKDOOR) + if (ldub_code(s->pc) == 0x0f && ldub_code(s->pc + 1) == 0x04) { + uint8_t type = ldub_code(s->pc + 2); + TCGv_i32 cmd; + /* TODO: should break TB, but gen_eob generates an infinite loop */ + switch (type) { + case 0x00: /* i8 */ + cmd = tcg_const_i32((uint32_t)ldub_code(s->pc + 3)); + gen_helper_backdoor_i8(cmd); + break; + case 0x01: /* i8 v */ + cmd = tcg_const_i32(ldub_code(s->pc + 3)); + gen_helper_backdoor_i8_v(cmd, cpu_regs[R_EAX]); + break; + default: + goto illegal_op; + } + s->pc += 4; + gen_jmp_im(s->pc); + gen_eob(s); + goto backdoor_done; + } +#endif + next_byte: b = ldub_code(s->pc); s->pc++; @@ -7636,6 +7661,11 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start) default: goto illegal_op; } + +#if defined(CONFIG_BACKDOOR) +backdoor_done: +#endif + /* lock generation */ if (s->prefix & PREFIX_LOCK) gen_helper_unlock();