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Tue, 14 Jul 2026 19:03:55 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9AF4920040; Tue, 14 Jul 2026 19:03:54 +0000 (GMT) Received: from li-d2cd37cc-2ca3-11b2-a85c-84ed3706e5a0.ibm.com (unknown [9.111.27.233]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 14 Jul 2026 19:03:54 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=MvHvSO9S9IcYJkzmp N7yHB9Y9M1L2bNieOVHwKTfdps=; b=cIuyrB/faWb154qzp8JZB9rPPLzFtfs2C qZL4fSHil8ZL7K0wHsB9/5av+MYbfeykI/aofvCCQGIlDseK+ph5YsgWNmSqm8Td OegxhDBEfN7f6xkuhT5UQ9CARZNBFS93cI4VUbMnFXoQMktjFwJxwEtYsY/I7v+O trj/0zVfBoWuTvvpp1ReDuPGd4w9AiRuOlzNHxyNNWtUUKq83Q5FlbhopjXEALJE iJUtosd/dfGDimnlg89me2KLtxwf1NPWjcR8O8G8ayCn9brVgX0JGkksAjOV73OY humH0vxTz/qE/BVzCSXn+cnS3OomXpLabqE7R8VYQqmRDUf+CMyjA== From: Ilya Leoshkevich To: Richard Henderson , Cornelia Huck , Eric Farman , Matthew Rosato Cc: David Hildenbrand , qemu-s390x@nongnu.org, qemu-devel@nongnu.org, Ilya Leoshkevich , Christian Borntraeger , qemu-stable@nongnu.org Subject: [PATCH 1/2] target/s390x: Fix DR/D INT64_MIN / -1 host crash Date: Tue, 14 Jul 2026 21:02:40 +0200 Message-ID: <20260714190351.337923-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260714190351.337923-1-iii@linux.ibm.com> References: <20260714190351.337923-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=fOcJG5ae c=1 sm=1 tr=0 ts=6a56881f cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=69wJf7TsAAAA:8 a=aSik7ZIpPfau7K45Dq0A:9 a=Fg1AiH1G6rFz08G2ETeA:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE0MDE5MyBTYWx0ZWRfXz873b9l/uqyu jJd8oLVcqDLIVTPI2AMkYTwYOxB1jkvLYTiGE7dM7RTq7WCWYx/6F+sofIM76mjd/eCrtZKt/1V 3BmJzSADHaMQbHaDidv7EVidhKbpjKUvyJDsaO03g46496iP6OWcjwC/adL73L00ti1w07ZzhlF pgdZc5sWbARTWTdgxI1fLkA4RJJA3bC1IUTwCCuttRe0vePomL3vPPHJe2t9mulAt6EwfBnCWBA QStRtmSS0A3FLSf8d7zkRwNvMByAapRV3iJiz7PI3LDPeb/Z9+0c0z9I0ML/rpO4TKiBTYaS1QH NYfSBACt1X48X15Ipsk80gCnMeo7LP+bcLjztjxSmuOPCs0VI9Qh+1a367aLouy/FhoLge9H9As wNbY83a1+aBO1G3B0Wuk9n+Vzo1ND9rRTPSrjloWChNNR9nRrY31SvKITcshRoZdIXOYJ+dIPZL Y1DqFE7eeWHu5GWVfhA== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE0MDE5MyBTYWx0ZWRfX6LtYdh7dQLLO 2OUGUnJllgiV9Rv/WpUYt2eCnG15Ik7O/OnwXleRzSp0BoCHIrFa0G45G6ddh32siEqtl603D2/ /ft9bSVUU3cdUy4UMTyRdzTv6vO2r9A= X-Proofpoint-GUID: AxPSijxeWBPZepytWOAyJshYH_P62V8v X-Proofpoint-ORIG-GUID: AxPSijxeWBPZepytWOAyJshYH_P62V8v X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-14_04,2026-07-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 impostorscore=0 suspectscore=0 adultscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607140193 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1784055883394158500 Content-Type: text/plain; charset="utf-8" helper_divs32() divides the 64-bit dividend by the 32-bit divisor as a 64-b= it host operation, guarding only against a zero divisor. INT64_MIN / -1 theref= ore overflows the host division before the representability check runs; on hosts that trap this, QEMU is killed with SIGFPE instead of raising the fixed-point-divide exception the guest expects: qemu-s390x: QEMU internal SIGFPE {code=3DINTDIV, addr=3D...} helper_divs64() already guards the same case; add the missing check to helper_divs32(). Reported-by: Christian Borntraeger Fixes: b4e2bd3563af ("target-s390: Send signals for divide") Cc: qemu-stable@nongnu.org Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson --- target/s390x/tcg/int_helper.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/s390x/tcg/int_helper.c b/target/s390x/tcg/int_helper.c index fbda396f5b4..5aedd1405bf 100644 --- a/target/s390x/tcg/int_helper.c +++ b/target/s390x/tcg/int_helper.c @@ -39,7 +39,8 @@ uint64_t HELPER(divs32)(CPUS390XState *env, int64_t a, in= t64_t b64) int32_t b =3D b64; int64_t q, r; =20 - if (b =3D=3D 0) { + /* Catch divide by zero, and non-representable quotient (MIN / -1). */ + if (b =3D=3D 0 || (b =3D=3D -1 && a =3D=3D (1ll << 63))) { tcg_s390_program_interrupt(env, PGM_FIXPT_DIVIDE, GETPC()); } =20 --=20 2.55.0 From nobody Sat Jul 25 18:53:57 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1784055869375158500 Content-Type: text/plain; charset="utf-8" Check that DR with a non-representable quotient raises SIGFPE rather than crashing the emulator. Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson --- tests/tcg/s390x/div.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/tests/tcg/s390x/div.c b/tests/tcg/s390x/div.c index 6ad9900e082..124c9ecc339 100644 --- a/tests/tcg/s390x/div.c +++ b/tests/tcg/s390x/div.c @@ -1,6 +1,15 @@ #include +#include #include =20 +/* Set asynchronously by the signal handler. */ +static volatile int signum; + +static void signal_handler(int n) +{ + signum =3D n; +} + static void test_dr(void) { register int32_t r0 asm("r0") =3D -1; @@ -65,11 +74,39 @@ static void test_dlgr(void) assert(r =3D=3D 1); } =20 +/* + * The most negative dividend divided by -1 yields a quotient that does not + * fit into 32 bits, so DR must raise a fixed-point-divide exception. + */ +static void test_dr_overflow(void) +{ + struct sigaction act =3D { .sa_handler =3D signal_handler }; + register int32_t r0 asm("r0"); + register int32_t r1 asm("r1"); + int32_t b =3D -1; + int err; + + err =3D sigaction(SIGFPE, &act, NULL); + assert(err =3D=3D 0); + signum =3D -1; + + r0 =3D 0x80000000; + r1 =3D 0; + asm volatile("dr %[r0],%[b]" + : [r0] "+r" (r0), [r1] "+r" (r1) + : [b] "r" (b) + : "cc"); + assert(signum =3D=3D SIGFPE); + + signal(SIGFPE, SIG_DFL); +} + int main(void) { test_dr(); test_dlr(); test_dsgr(); test_dlgr(); + test_dr_overflow(); return 0; } --=20 2.55.0