From patchwork Fri Aug 2 09:59:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13751375 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 87772C3DA4A for ; Fri, 2 Aug 2024 10:03:07 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sZp7B-0007ES-Tn; Fri, 02 Aug 2024 06:02:25 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sZp78-00078y-Py for qemu-devel@nongnu.org; Fri, 02 Aug 2024 06:02:22 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sZp76-0004dU-R5 for qemu-devel@nongnu.org; Fri, 02 Aug 2024 06:02:22 -0400 Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4729HIZM018789; Fri, 2 Aug 2024 10:02:18 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=pp1; bh=xgiNEOZec+cTa 1XyCOikEGB8SlWebH4QPlQyjtj1wUE=; b=oh/SvruPCSevgRBiLtsM1Q8v/phPD pHG8NitNA1x5TQd4vV6f3svYfUiDeJwamegV4osgspxfbLMsCfxkb7HCPImPaHnh Z+bHQ7bOlnofW7CfOsTux9+rMwJwhBLysTt8l9KIf4kcBk3JTuqevs2N6Vv1ydF+ A+5BkCV+xFUsACHUMyy0p4FD7e2weOqVfNg3aw7l9ACyTC/wVAJ3SnnUeqtsZmmO uLSM/u2PGeLRpo9A+bvyaapQdr0+uuhXFMtqKjk6rqVzROt+1J4pWIFByork6j9l IYHZNEegEjcm7zRseOHcJ+ds6S3mck53xhMmCGxPU31h2tndMmL8fctbA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 40ruypg6mq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 02 Aug 2024 10:02:17 +0000 (GMT) Received: from m0356516.ppops.net (m0356516.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 472A2HFQ006523; Fri, 2 Aug 2024 10:02:17 GMT Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 40ruypg6mk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 02 Aug 2024 10:02:17 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 4728orcN009205; Fri, 2 Aug 2024 10:02:16 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 40ndx3eatf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 02 Aug 2024 10:02:16 +0000 Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 472A2CS851446106 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 2 Aug 2024 10:02:14 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A4B4920067; Fri, 2 Aug 2024 10:02:11 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4C91D2004F; Fri, 2 Aug 2024 10:02:11 +0000 (GMT) Received: from heavy.ibm.com (unknown [9.171.14.120]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 2 Aug 2024 10:02:11 +0000 (GMT) From: Ilya Leoshkevich To: Laurent Vivier , =?utf-8?q?Alex_Benn=C3=A9e?= , =?utf-8?q?Philippe_M?= =?utf-8?q?athieu-Daud=C3=A9?= , Paolo Bonzini , Richard Henderson Cc: qemu-devel@nongnu.org, Ilya Leoshkevich Subject: [PATCH 2/5] linux-user/i386: Emulate orig_ax Date: Fri, 2 Aug 2024 11:59:15 +0200 Message-ID: <20240802095942.34565-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240802095942.34565-1-iii@linux.ibm.com> References: <20240802095942.34565-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: rwiB53lT8I59F_9Rj7dfo6_S53MLMD9b X-Proofpoint-ORIG-GUID: xQoDlqG88Gie9iMIojC94aZjD5as5CaC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-02_06,2024-08-01_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 suspectscore=0 mlxlogscore=913 phishscore=0 priorityscore=1501 malwarescore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408020066 Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The kernel uses orig_rax/orig_eax to store the syscall number before a syscall. One can see this value in core dumps and ptrace. Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson --- linux-user/elfload.c | 4 ++-- linux-user/i386/cpu_loop.c | 3 +++ linux-user/qemu.h | 5 +++++ 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 05292c27776..2d73382ae6b 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -203,7 +203,7 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *en (*regs)[12] = tswapreg(env->regs[R_EDX]); (*regs)[13] = tswapreg(env->regs[R_ESI]); (*regs)[14] = tswapreg(env->regs[R_EDI]); - (*regs)[15] = tswapreg(env->regs[R_EAX]); /* XXX */ + (*regs)[15] = tswapreg(get_task_state(env_cpu_const(env))->orig_ax); (*regs)[16] = tswapreg(env->eip); (*regs)[17] = tswapreg(env->segs[R_CS].selector & 0xffff); (*regs)[18] = tswapreg(env->eflags); @@ -306,7 +306,7 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *en (*regs)[8] = tswapreg(env->segs[R_ES].selector & 0xffff); (*regs)[9] = tswapreg(env->segs[R_FS].selector & 0xffff); (*regs)[10] = tswapreg(env->segs[R_GS].selector & 0xffff); - (*regs)[11] = tswapreg(env->regs[R_EAX]); /* XXX */ + (*regs)[11] = tswapreg(get_task_state(env_cpu_const(env))->orig_ax); (*regs)[12] = tswapreg(env->eip); (*regs)[13] = tswapreg(env->segs[R_CS].selector & 0xffff); (*regs)[14] = tswapreg(env->eflags); diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c index 92beb6830cc..7a35215278a 100644 --- a/linux-user/i386/cpu_loop.c +++ b/linux-user/i386/cpu_loop.c @@ -172,6 +172,7 @@ static void emulate_vsyscall(CPUX86State *env) /* * Perform the syscall. None of the vsyscalls should need restarting. */ + get_task_state(env_cpu(env))->orig_ax = syscall; ret = do_syscall(env, syscall, env->regs[R_EDI], env->regs[R_ESI], env->regs[R_EDX], env->regs[10], env->regs[8], env->regs[9], 0, 0); @@ -221,6 +222,7 @@ void cpu_loop(CPUX86State *env) case EXCP_SYSCALL: #endif /* linux syscall from int $0x80 */ + get_task_state(cs)->orig_ax = env->regs[R_EAX]; ret = do_syscall(env, env->regs[R_EAX], env->regs[R_EBX], @@ -239,6 +241,7 @@ void cpu_loop(CPUX86State *env) #ifdef TARGET_X86_64 case EXCP_SYSCALL: /* linux syscall from syscall instruction. */ + get_task_state(cs)->orig_ax = env->regs[R_EAX]; ret = do_syscall(env, env->regs[R_EAX], env->regs[R_EDI], diff --git a/linux-user/qemu.h b/linux-user/qemu.h index a2961f503f4..85ba5a53869 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -159,6 +159,11 @@ struct TaskState { /* Start time of task after system boot in clock ticks */ uint64_t start_boottime; + +#if defined(TARGET_I386) + /* Last syscall number. */ + target_ulong orig_ax; +#endif }; abi_long do_brk(abi_ulong new_brk);