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Wed, 10 May 2023 23:02:20 +0000 (GMT) From: Ilya Leoshkevich To: Laurent Vivier , Richard Henderson , David Hildenbrand , Thomas Huth Cc: qemu-devel@nongnu.org, qemu-s390x@nongnu.org, Ilya Leoshkevich Subject: [PATCH 0/2] linux-user/s390x: Fix single-stepping SVC Date: Thu, 11 May 2023 01:02:11 +0200 Message-Id: <20230510230213.330134-1-iii@linux.ibm.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: -0NQgeEhOWeiJBLv1tmDxXMpXaIznOTb X-Proofpoint-GUID: VPIpuKl8-QZvdHuEOCHAxjQxiu4Rlq3T X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-10_04,2023-05-05_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 mlxscore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 mlxlogscore=518 priorityscore=1501 clxscore=1015 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305100191 Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 Hi, I noticed that single-stepping SVC runs two instructions instead of one. The reason is that EXCP_SVC masks EXCP_DEBUG. Patch 1 fixes this problem, patch 2 adds a test. Btw, there is at least one more problem in that area, namely single-stepping instructions that cause e.g. SIGILL. Using the existing signals-s390x test as an example: (gdb) x/i $pc => 0x1001740 : .long 0x000007fe (gdb) si Program received signal SIGILL, Illegal instruction. (gdb) x/i $pc => 0x1001742 : br %r14 # So far so good. (gdb) si (gdb) x/i $pc => 0x10017b6 : lay %r15,-344(%r15) # Missed the first signal handler instruction! I'm not sure what to do about it - the trivial fix to add gdb_handlesig(cpu, 0) to the end of handle_pending_signal() caused GDB to hang, and I haven't looked further yet. Best regards, Ilya Ilya Leoshkevich (2): linux-user/s390x: Fix single-stepping SVC tests/tcg/s390x: Test single-stepping SVC linux-user/s390x/cpu_loop.c | 9 ++++ tests/tcg/s390x/Makefile.target | 11 ++++- tests/tcg/s390x/gdbstub/test-svc.py | 64 +++++++++++++++++++++++++++++ tests/tcg/s390x/hello-s390x-asm.S | 20 +++++++++ 4 files changed, 103 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/s390x/gdbstub/test-svc.py create mode 100644 tests/tcg/s390x/hello-s390x-asm.S -- 2.40.1