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envelope-from=farman@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_H4=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: 2.1.29 Precedence: list List-Id: qemu development 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 From: Ilya Leoshkevich Check that DR with a non-representable quotient raises SIGFPE rather than crashing the emulator. Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson Link: https://lore.kernel.org/qemu-devel/20260714190351.337923-3-iii@linux.ibm.com Signed-off-by: Eric Farman --- 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 6ad9900e08..124c9ecc33 100644 --- a/tests/tcg/s390x/div.c +++ b/tests/tcg/s390x/div.c @@ -1,6 +1,15 @@ #include +#include #include +/* Set asynchronously by the signal handler. */ +static volatile int signum; + +static void signal_handler(int n) +{ + signum = n; +} + static void test_dr(void) { register int32_t r0 asm("r0") = -1; @@ -65,11 +74,39 @@ static void test_dlgr(void) assert(r == 1); } +/* + * 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 = { .sa_handler = signal_handler }; + register int32_t r0 asm("r0"); + register int32_t r1 asm("r1"); + int32_t b = -1; + int err; + + err = sigaction(SIGFPE, &act, NULL); + assert(err == 0); + signum = -1; + + r0 = 0x80000000; + r1 = 0; + asm volatile("dr %[r0],%[b]" + : [r0] "+r" (r0), [r1] "+r" (r1) + : [b] "r" (b) + : "cc"); + assert(signum == SIGFPE); + + signal(SIGFPE, SIG_DFL); +} + int main(void) { test_dr(); test_dlr(); test_dsgr(); test_dlgr(); + test_dr_overflow(); return 0; } -- 2.55.0