From patchwork Fri Apr 16 15:49:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 1467094 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=Z2aQmGE6; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4FMLP40njxz9sWK for ; Sat, 17 Apr 2021 01:54:16 +1000 (AEST) Received: from localhost ([::1]:59620 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lXQnO-0006OH-2y for incoming@patchwork.ozlabs.org; Fri, 16 Apr 2021 11:54:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36738) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQjC-00039S-Tu; Fri, 16 Apr 2021 11:49:54 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:64480) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQj8-000087-Rg; Fri, 16 Apr 2021 11:49:54 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13GFY8YY089936; Fri, 16 Apr 2021 11:49:48 -0400 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=s+xocQN6xiHTQK3frx/YTOYIPSoAczd3F8sE78d4gjE=; b=Z2aQmGE6togKSwKC1E5MzwWyx35igdTQvyyi3PBrVf2s6BX7CzEl/etFyKWCDgKKHeHF d5yF0aiTK3J2jmLBTvpb2r59yoUBYtQxCw+Fa3Su9FW+OooRGnErqHiJMTu8BdLtLNPa mdYKxKDRDGdpWhmLWQBri8LNCkKEVjRZc/bLEzdDPN+GbI5iK9OI9xZQ7KMwhO2kDNR0 iRD+E4L1RdHJjnwsyNDzC4BV/aAmhopekYQOrOEgSu/739aRnkfUthCOcelKx+wwWUKC 9uFkrOXTiOYlJdIEGSownQudT/7mG04ibG8QCt9lOm1Xaq2NHknXx3gcWpTILfNCrXBb 8Q== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 37y7babrnq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:48 -0400 Received: from m0098409.ppops.net (m0098409.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 13GFYhCB091628; Fri, 16 Apr 2021 11:49:47 -0400 Received: from ppma05fra.de.ibm.com (6c.4a.5195.ip4.static.sl-reverse.com [149.81.74.108]) by mx0a-001b2d01.pphosted.com with ESMTP id 37y7babrmy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:47 -0400 Received: from pps.filterd (ppma05fra.de.ibm.com [127.0.0.1]) by ppma05fra.de.ibm.com (8.16.0.43/8.16.0.43) with SMTP id 13GFf6kr013259; Fri, 16 Apr 2021 15:49:45 GMT Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by ppma05fra.de.ibm.com with ESMTP id 37u3n8af9f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 15:49:45 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 13GFng4h35717400 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Apr 2021 15:49:42 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0ACBE11C04A; Fri, 16 Apr 2021 15:49:42 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 74B9A11C04C; Fri, 16 Apr 2021 15:49:41 +0000 (GMT) Received: from vm.lan (unknown [9.145.157.105]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 16 Apr 2021 15:49:41 +0000 (GMT) From: Ilya Leoshkevich To: Cornelia Huck , Thomas Huth , Richard Henderson , David Hildenbrand , Paolo Bonzini , Peter Maydell , Max Filippov Subject: [PATCH v5 1/4] target/s390x: Fix translation exception on illegal instruction Date: Fri, 16 Apr 2021 17:49:36 +0200 Message-Id: <20210416154939.32404-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210416154939.32404-1-iii@linux.ibm.com> References: <20210416154939.32404-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 87dxqVT9DS7zwBacRqnfZf9O_8-n7WJF X-Proofpoint-GUID: HRz2lxJcTEQUMQLkKGkFScSUER62jKm- X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-04-16_08:2021-04-16, 2021-04-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104160113 Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christian Borntraeger , qemu-s390x@nongnu.org, qemu-arm@nongnu.org, qemu-devel@nongnu.org, Ilya Leoshkevich Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Hitting an uretprobe in a s390x TCG guest causes a SIGSEGV. What happens is: * uretprobe maps a userspace page containing an invalid instruction. * uretprobe replaces the target function's return address with the address of that page. * When tb_gen_code() is called on that page, tb->size ends up being 0 (because the page starts with the invalid instruction), which causes virt_page2 to point to the previous page. * The previous page is not mapped, so this causes a spurious translation exception. tb->size must never be 0: even if there is an illegal instruction, the instruction bytes that have been looked at must count towards tb->size. So adjust s390x's translate_one() to act this way for both illegal instructions and instructions that are known to generate exceptions. Signed-off-by: Ilya Leoshkevich Reviewed-by: David Hildenbrand --- target/s390x/translate.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/target/s390x/translate.c b/target/s390x/translate.c index 4f953ddfba..e243624d2a 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -6412,7 +6412,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s) qemu_log_mask(LOG_UNIMP, "unimplemented opcode 0x%02x%02x\n", s->fields.op, s->fields.op2); gen_illegal_opcode(s); - return DISAS_NORETURN; + ret = DISAS_NORETURN; + goto out; } #ifndef CONFIG_USER_ONLY @@ -6428,7 +6429,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s) /* privileged instruction */ if ((s->base.tb->flags & FLAG_MASK_PSTATE) && (insn->flags & IF_PRIV)) { gen_program_exception(s, PGM_PRIVILEGED); - return DISAS_NORETURN; + ret = DISAS_NORETURN; + goto out; } /* if AFP is not enabled, instructions and registers are forbidden */ @@ -6455,7 +6457,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s) } if (dxc) { gen_data_exception(dxc); - return DISAS_NORETURN; + ret = DISAS_NORETURN; + goto out; } } @@ -6463,7 +6466,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s) if (insn->flags & IF_VEC) { if (!((s->base.tb->flags & FLAG_MASK_VECTOR))) { gen_data_exception(0xfe); - return DISAS_NORETURN; + ret = DISAS_NORETURN; + goto out; } } @@ -6484,7 +6488,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s) (insn->spec & SPEC_r1_f128 && !is_fp_pair(get_field(s, r1))) || (insn->spec & SPEC_r2_f128 && !is_fp_pair(get_field(s, r2)))) { gen_program_exception(s, PGM_SPECIFICATION); - return DISAS_NORETURN; + ret = DISAS_NORETURN; + goto out; } } @@ -6544,6 +6549,7 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s) } #endif +out: /* Advance to the next instruction. */ s->base.pc_next = s->pc_tmp; return ret; From patchwork Fri Apr 16 15:49:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 1467092 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=cg8F/jys; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4FMLKH35vtz9sVb for ; Sat, 17 Apr 2021 01:50:59 +1000 (AEST) Received: from localhost ([::1]:52122 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lXQkD-000388-E9 for incoming@patchwork.ozlabs.org; Fri, 16 Apr 2021 11:50:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36694) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQjA-00033s-8O; Fri, 16 Apr 2021 11:49:52 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:64850 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQj8-000085-GT; Fri, 16 Apr 2021 11:49:51 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13GFY0ia065465; Fri, 16 Apr 2021 11:49:48 -0400 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=noW5sQQCRmg+yeWGQnejM9mslGtD7xpsjveru2Pctc0=; b=cg8F/jysqjSbb7PeucDArGIptbmlBdPtiYacJHiGdbWcrii1qyricN9B+iszb47TJ8+j HUPRtTo+hqI3E0mxTbqxkWMiopaxW1rk5OatWaR6QiuvJ154K3IbX/ccbIpIjretUkbA gqYvbFTpA7i++fapDAmqheuxTjfGZu5Ok1OWtBCXi5ZllB9fUyDPXWUzbv8MSgzk3xDN F/MNkejimUHMD/FvG/FmLUA01SbFctYYS8teEKU6vlTM29xR1uYQyUygFFrk7v8ttYR4 9tffG3VdQX7nQQZL9P2LevtPSlVk8g8W05fg5gSAp4mnCTNhSG2+qoqYC1zQgTa9mRDs Qg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 37xxnpq9rc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:48 -0400 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 13GFYUHM067985; Fri, 16 Apr 2021 11:49:48 -0400 Received: from ppma01fra.de.ibm.com (46.49.7a9f.ip4.static.sl-reverse.com [159.122.73.70]) by mx0b-001b2d01.pphosted.com with ESMTP id 37xxnpq9qv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:48 -0400 Received: from pps.filterd (ppma01fra.de.ibm.com [127.0.0.1]) by ppma01fra.de.ibm.com (8.16.0.43/8.16.0.43) with SMTP id 13GFcoDE014255; Fri, 16 Apr 2021 15:49:46 GMT Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by ppma01fra.de.ibm.com with ESMTP id 37u3n8af7q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 15:49:46 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 13GFnhiW23462286 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Apr 2021 15:49:43 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1B4E711C04C; Fri, 16 Apr 2021 15:49:43 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C00111C050; Fri, 16 Apr 2021 15:49:42 +0000 (GMT) Received: from vm.lan (unknown [9.145.157.105]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 16 Apr 2021 15:49:42 +0000 (GMT) From: Ilya Leoshkevich To: Cornelia Huck , Thomas Huth , Richard Henderson , David Hildenbrand , Paolo Bonzini , Peter Maydell , Max Filippov Subject: [PATCH v5 2/4] target/arm: Make sure that commpage's tb->size != 0 Date: Fri, 16 Apr 2021 17:49:37 +0200 Message-Id: <20210416154939.32404-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210416154939.32404-1-iii@linux.ibm.com> References: <20210416154939.32404-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: vmJfguCAx6tIG_ESjfhEJnw66f8i9uXT X-Proofpoint-ORIG-GUID: QpSuOqeBSt0GW49ex5au31BXOt4bM06M X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-04-16_08:2021-04-16, 2021-04-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 mlxscore=0 impostorscore=0 spamscore=0 malwarescore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104160113 Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christian Borntraeger , qemu-s390x@nongnu.org, qemu-arm@nongnu.org, qemu-devel@nongnu.org, Ilya Leoshkevich Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" tb_gen_code() assumes that tb->size must never be zero, otherwise it may produce spurious exceptions. For ARM this may happen when creating a translation block for the commpage. Fix by pretending that commpage translation blocks have at least one instruction. Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson --- target/arm/translate.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/target/arm/translate.c b/target/arm/translate.c index 62b1c2081b..cb9e30c341 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -9060,6 +9060,7 @@ static void arm_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu) unsigned int insn; if (arm_pre_translate_insn(dc)) { + dc->base.pc_next += 4; return; } @@ -9129,6 +9130,7 @@ static void thumb_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu) bool is_16bit; if (arm_pre_translate_insn(dc)) { + dc->base.pc_next += 2; return; } From patchwork Fri Apr 16 15:49:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 1467100 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=f81oEnCU; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4FMLT52dhFz9sRK for ; Sat, 17 Apr 2021 01:57:45 +1000 (AEST) Received: from localhost ([::1]:41528 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lXQql-0002KQ-Bz for incoming@patchwork.ozlabs.org; Fri, 16 Apr 2021 11:57:43 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36734) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQjB-000375-TH; Fri, 16 Apr 2021 11:49:53 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:5010 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQj9-00008C-4z; Fri, 16 Apr 2021 11:49:53 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13GFY0Xj065507; Fri, 16 Apr 2021 11:49:49 -0400 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=aIH+K6nY0M5Tr83uVAnya+jMs4dVBoGuCziova4IDT0=; b=f81oEnCU39RArElfgWZnBeKMkN/JTy6hEsrI4pLcJ9oVBMjfGHraPXnrXrMNkIWSc9an KtIUSqga3oq79PA8YRxmWZJjkcIQIfiwYoQi3kyQfZ9GpDzD4eh5JIaGqOmbZ7OWCKMb 63ktaHL5mAlKHGXaNXLAaKoZ0AiZJ/nBpOzxhPGdvTwxeuMZWgb0+W8wEkpDUb7u58Kn aAx+a9aEarT3+070QWeuhNFvB0+I+200rwOs92j3Ouhs6rfBr1MbxL1ztiYkzVk8ZtKm 7MeTfEkxp1mQT5UmKHIOWooi2CM6rNFlqvUEvME4lPxBSr+NCWbFCG5tHpVv4VzSJuM5 rw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 37xxnpq9rr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:49 -0400 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 13GFaD7n073332; Fri, 16 Apr 2021 11:49:48 -0400 Received: from ppma05fra.de.ibm.com (6c.4a.5195.ip4.static.sl-reverse.com [149.81.74.108]) by mx0b-001b2d01.pphosted.com with ESMTP id 37xxnpq9r2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:48 -0400 Received: from pps.filterd (ppma05fra.de.ibm.com [127.0.0.1]) by ppma05fra.de.ibm.com (8.16.0.43/8.16.0.43) with SMTP id 13GFdZpm011719; Fri, 16 Apr 2021 15:49:47 GMT Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by ppma05fra.de.ibm.com with ESMTP id 37u3n8af9g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 15:49:46 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 13GFniKx51577332 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Apr 2021 15:49:44 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 15B1E11C050; Fri, 16 Apr 2021 15:49:44 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7878811C04C; Fri, 16 Apr 2021 15:49:43 +0000 (GMT) Received: from vm.lan (unknown [9.145.157.105]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 16 Apr 2021 15:49:43 +0000 (GMT) From: Ilya Leoshkevich To: Cornelia Huck , Thomas Huth , Richard Henderson , David Hildenbrand , Paolo Bonzini , Peter Maydell , Max Filippov Subject: [PATCH v5 3/4] target/xtensa: Make sure that tb->size != 0 Date: Fri, 16 Apr 2021 17:49:38 +0200 Message-Id: <20210416154939.32404-4-iii@linux.ibm.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210416154939.32404-1-iii@linux.ibm.com> References: <20210416154939.32404-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: lGGMW3XrmXZ0P2quwYlERV-qi7_veL5d X-Proofpoint-ORIG-GUID: i6OE4pETpKl-BvmMDWhilPH0zVbdCxJV X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-04-16_08:2021-04-16, 2021-04-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 mlxscore=0 impostorscore=0 spamscore=0 malwarescore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104160113 Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christian Borntraeger , qemu-s390x@nongnu.org, qemu-arm@nongnu.org, qemu-devel@nongnu.org, Ilya Leoshkevich Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" tb_gen_code() assumes that tb->size must never be zero, otherwise it may produce spurious exceptions. For xtensa this may happen when decoding an unknown instruction, when handling a write into the CCOUNT or CCOMPARE special register and when single-stepping the first instruction of an exception handler. Fix by pretending that the size of the respective translation block is 1 in all these cases. Signed-off-by: Ilya Leoshkevich Tested-by: Max Filippov Acked-by: Max Filippov --- target/xtensa/translate.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/target/xtensa/translate.c b/target/xtensa/translate.c index 0ae4efc48a..73584d9d60 100644 --- a/target/xtensa/translate.c +++ b/target/xtensa/translate.c @@ -917,6 +917,7 @@ static void disas_xtensa_insn(CPUXtensaState *env, DisasContext *dc) "unknown instruction length (pc = %08x)\n", dc->pc); gen_exception_cause(dc, ILLEGAL_INSTRUCTION_CAUSE); + dc->base.pc_next = dc->pc + 1; return; } @@ -1274,11 +1275,13 @@ static void xtensa_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu) if ((tb_cflags(dc->base.tb) & CF_USE_ICOUNT) && (dc->base.tb->flags & XTENSA_TBFLAG_YIELD)) { gen_exception(dc, EXCP_YIELD); + dc->base.pc_next = dc->pc + 1; dc->base.is_jmp = DISAS_NORETURN; return; } if (dc->base.tb->flags & XTENSA_TBFLAG_EXCEPTION) { gen_exception(dc, EXCP_DEBUG); + dc->base.pc_next = dc->pc + 1; dc->base.is_jmp = DISAS_NORETURN; return; } From patchwork Fri Apr 16 15:49:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 1467101 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=rhmZSRad; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4FMLTt1kr7z9sRK for ; Sat, 17 Apr 2021 01:58:26 +1000 (AEST) Received: from localhost ([::1]:42618 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lXQrQ-0002me-9A for incoming@patchwork.ozlabs.org; Fri, 16 Apr 2021 11:58:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36756) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQjE-0003Ci-D4; Fri, 16 Apr 2021 11:49:56 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:31264) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQjC-0000AL-L2; Fri, 16 Apr 2021 11:49:56 -0400 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13GFYH3J053283; Fri, 16 Apr 2021 11:49:51 -0400 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=BW7u4WcPkobkkMRidYkYfR+F2b4Woa8iJkWP89Rsaw0=; b=rhmZSRadD7SxyXstfcChiE0CWc8PebalfuVyct+eGWEFuzPREaK8B+pyVyN9/BAmTJp/ 4yoe7yDMT/EyNMZ4jnGQsoal+XinlDMjAHrIzpzbRiGp5f5aprr0Gl7ptrceknwSRQT+ oI4NMCrvHdrr4NcIi9Qw5GSkKb7cqf8VI+C7+hILkam8gPIllOHvBchQ5aEzCe7h09nI o+2l06UDYSrVyvMK/Qz5B2cBYVx3pv5L1P1YK9sH0aH2nV9E1j3BRl3ytsDPapJS0Nnt mCqAYUmMDgJL6pryrXn+lEyYmDqW6xni3OfvCTMLQzc9qoUkGvJhKJL0r/mgHmniI5+S Nw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 37xtt557v3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:51 -0400 Received: from m0098396.ppops.net (m0098396.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 13GFZrsN057861; Fri, 16 Apr 2021 11:49:50 -0400 Received: from ppma06ams.nl.ibm.com (66.31.33a9.ip4.static.sl-reverse.com [169.51.49.102]) by mx0a-001b2d01.pphosted.com with ESMTP id 37xtt557uc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 11:49:50 -0400 Received: from pps.filterd (ppma06ams.nl.ibm.com [127.0.0.1]) by ppma06ams.nl.ibm.com (8.16.0.43/8.16.0.43) with SMTP id 13GFbxE7006087; Fri, 16 Apr 2021 15:49:48 GMT Received: from b06cxnps4076.portsmouth.uk.ibm.com (d06relay13.portsmouth.uk.ibm.com [9.149.109.198]) by ppma06ams.nl.ibm.com with ESMTP id 37u39hmjcj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Apr 2021 15:49:48 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 13GFnjBL41156866 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Apr 2021 15:49:45 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4E96511C04A; Fri, 16 Apr 2021 15:49:45 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6F77311C04C; Fri, 16 Apr 2021 15:49:44 +0000 (GMT) Received: from vm.lan (unknown [9.145.157.105]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 16 Apr 2021 15:49:44 +0000 (GMT) From: Ilya Leoshkevich To: Cornelia Huck , Thomas Huth , Richard Henderson , David Hildenbrand , Paolo Bonzini , Peter Maydell , Max Filippov Subject: [PATCH v5 4/4] accel/tcg: Assert that tb->size != 0 after translation Date: Fri, 16 Apr 2021 17:49:39 +0200 Message-Id: <20210416154939.32404-5-iii@linux.ibm.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210416154939.32404-1-iii@linux.ibm.com> References: <20210416154939.32404-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: J43xLxcyno3JKawLUFbfMJnbOCA4Pm7t X-Proofpoint-GUID: A_0AMjkrKDxv1E7V4_Suz2htj5rdtSqp X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-04-16_08:2021-04-16, 2021-04-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 priorityscore=1501 mlxlogscore=999 malwarescore=0 phishscore=0 clxscore=1015 suspectscore=0 bulkscore=0 impostorscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104160113 Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christian Borntraeger , qemu-s390x@nongnu.org, qemu-arm@nongnu.org, qemu-devel@nongnu.org, Ilya Leoshkevich Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" If arch-specific code generates a translation block of size 0, tb_gen_code() may generate a spurious exception. Add an assertion in order to catch such situations early. Signed-off-by: Ilya Leoshkevich Reviewed-by: David Hildenbrand --- accel/tcg/translate-all.c | 1 + 1 file changed, 1 insertion(+) diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index ba6ab09790..93b2dae112 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -1913,6 +1913,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu, tcg_ctx->cpu = env_cpu(env); gen_intermediate_code(cpu, tb, max_insns); + assert(tb->size != 0); tcg_ctx->cpu = NULL; max_insns = tb->icount;