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Tue, 3 Aug 2021 19:48:26 +0000 (GMT) From: Ilya Leoshkevich To: Richard Henderson , David Hildenbrand , Laurent Vivier , Cornelia Huck Subject: [PATCH v7] tests/tcg/s390x: Test SIGILL and SIGSEGV handling Date: Tue, 3 Aug 2021 21:48:25 +0200 Message-Id: <20210803194825.149084-1-iii@linux.ibm.com> X-Mailer: git-send-email 2.31.1 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: JiqKnraPSBDjit_Irtpn5O7YAKrs4dab X-Proofpoint-GUID: fCf-Ba9JXL-gYwwAvVganNIO3iYPaNGH X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-08-03_05:2021-08-03, 2021-08-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxscore=0 malwarescore=0 clxscore=1015 mlxlogscore=999 phishscore=0 adultscore=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108030124 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_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: "jonathan . albrecht" , Ilya Leoshkevich , Ulrich Weigand , qemu-devel@nongnu.org, Christian Borntraeger , qemu-s390x@nongnu.org, Andreas Krebbel Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Verify that s390x-specific uc_mcontext.psw.addr is reported correctly and that signal handling interacts properly with debugging. Signed-off-by: Ilya Leoshkevich --- v6: https://lists.nongnu.org/archive/html/qemu-devel/2021-07/msg00873.html v6 -> v7: Rebased. tests/tcg/s390x/Makefile.target | 16 +- tests/tcg/s390x/gdbstub/test-signals-s390x.py | 76 ++++++++ tests/tcg/s390x/signals-s390x.c | 165 ++++++++++++++++++ 3 files changed, 256 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/s390x/gdbstub/test-signals-s390x.py create mode 100644 tests/tcg/s390x/signals-s390x.c diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target index 5d3de1b27a..5d984294f6 100644 --- a/tests/tcg/s390x/Makefile.target +++ b/tests/tcg/s390x/Makefile.target @@ -1,4 +1,5 @@ -VPATH+=$(SRC_PATH)/tests/tcg/s390x +S390X_SRC=$(SRC_PATH)/tests/tcg/s390x +VPATH+=$(S390X_SRC) CFLAGS+=-march=zEC12 -m64 TESTS+=hello-s390x TESTS+=csst @@ -8,4 +9,17 @@ TESTS+=exrl-trtr TESTS+=pack TESTS+=mvo TESTS+=mvc +TESTS+=signals-s390x +ifneq ($(HAVE_GDB_BIN),) +GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py + +run-gdbstub-signals-s390x: signals-s390x + $(call run-test, $@, $(GDB_SCRIPT) \ + --gdb $(HAVE_GDB_BIN) \ + --qemu $(QEMU) --qargs "$(QEMU_OPTS)" \ + --bin $< --test $(S390X_SRC)/gdbstub/test-signals-s390x.py, \ + "mixing signals and debugging on s390x") + +EXTRA_RUNS += run-gdbstub-signals-s390x +endif diff --git a/tests/tcg/s390x/gdbstub/test-signals-s390x.py b/tests/tcg/s390x/gdbstub/test-signals-s390x.py new file mode 100644 index 0000000000..80a284b475 --- /dev/null +++ b/tests/tcg/s390x/gdbstub/test-signals-s390x.py @@ -0,0 +1,76 @@ +from __future__ import print_function + +# +# Test that signals and debugging mix well together on s390x. +# +# This is launched via tests/guest-debug/run-test.py +# + +import gdb +import sys + +failcount = 0 + + +def report(cond, msg): + """Report success/fail of test""" + if cond: + print("PASS: %s" % (msg)) + else: + print("FAIL: %s" % (msg)) + global failcount + failcount += 1 + + +def run_test(): + """Run through the tests one by one""" + illegal_op = gdb.Breakpoint("illegal_op") + stg = gdb.Breakpoint("stg") + mvc_8 = gdb.Breakpoint("mvc_8") + + # Expect the following events: + # 1x illegal_op breakpoint + # 2x stg breakpoint, segv, breakpoint + # 2x mvc_8 breakpoint, segv, breakpoint + for _ in range(14): + gdb.execute("c") + report(illegal_op.hit_count == 1, "illegal_op.hit_count == 1") + report(stg.hit_count == 4, "stg.hit_count == 4") + report(mvc_8.hit_count == 4, "mvc_8.hit_count == 4") + + # The test must succeed. + gdb.Breakpoint("_exit") + gdb.execute("c") + status = int(gdb.parse_and_eval("$r2")) + report(status == 0, "status == 0"); + + +# +# This runs as the script it sourced (via -x, via run-test.py) +# +try: + inferior = gdb.selected_inferior() + arch = inferior.architecture() + print("ATTACHED: %s" % arch.name()) +except (gdb.error, AttributeError): + print("SKIPPING (not connected)", file=sys.stderr) + exit(0) + +if gdb.parse_and_eval("$pc") == 0: + print("SKIP: PC not set") + exit(0) + +try: + # These are not very useful in scripts + gdb.execute("set pagination off") + gdb.execute("set confirm off") + + # Run the actual tests + run_test() +except (gdb.error): + print("GDB Exception: %s" % (sys.exc_info()[0])) + failcount += 1 + pass + +print("All tests complete: %d failures" % failcount) +exit(failcount) diff --git a/tests/tcg/s390x/signals-s390x.c b/tests/tcg/s390x/signals-s390x.c new file mode 100644 index 0000000000..dc2f8ee59a --- /dev/null +++ b/tests/tcg/s390x/signals-s390x.c @@ -0,0 +1,165 @@ +#include +#include +#include +#include +#include +#include + +/* + * Various instructions that generate SIGILL and SIGSEGV. They could have been + * defined in a separate .s file, but this would complicate the build, so the + * inline asm is used instead. + */ + +void illegal_op(void); +void after_illegal_op(void); +asm(".globl\tillegal_op\n" + "illegal_op:\t.byte\t0x00,0x00\n" + "\t.globl\tafter_illegal_op\n" + "after_illegal_op:\tbr\t%r14"); + +void stg(void *dst, unsigned long src); +asm(".globl\tstg\n" + "stg:\tstg\t%r3,0(%r2)\n" + "\tbr\t%r14"); + +void mvc_8(void *dst, void *src); +asm(".globl\tmvc_8\n" + "mvc_8:\tmvc\t0(8,%r2),0(%r3)\n" + "\tbr\t%r14"); + +static void safe_puts(const char *s) +{ + write(0, s, strlen(s)); + write(0, "\n", 1); +} + +enum exception { + exception_operation, + exception_translation, + exception_protection, +}; + +static struct { + int sig; + void *addr; + unsigned long psw_addr; + enum exception exception; +} expected; + +static void handle_signal(int sig, siginfo_t *info, void *ucontext) +{ + void *page; + int err; + + if (sig != expected.sig) { + safe_puts("[ FAILED ] wrong signal"); + _exit(1); + } + + if (info->si_addr != expected.addr) { + safe_puts("[ FAILED ] wrong si_addr"); + _exit(1); + } + + if (((ucontext_t *)ucontext)->uc_mcontext.psw.addr != expected.psw_addr) { + safe_puts("[ FAILED ] wrong psw.addr"); + _exit(1); + } + + switch (expected.exception) { + case exception_translation: + page = mmap(expected.addr, 4096, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + if (page != expected.addr) { + safe_puts("[ FAILED ] mmap() failed"); + _exit(1); + } + break; + case exception_protection: + err = mprotect(expected.addr, 4096, PROT_READ | PROT_WRITE); + if (err != 0) { + safe_puts("[ FAILED ] mprotect() failed"); + _exit(1); + } + break; + default: + break; + } +} + +static void check_sigsegv(void *func, enum exception exception, + unsigned long val) +{ + int prot; + unsigned long *page; + unsigned long *addr; + int err; + + prot = exception == exception_translation ? PROT_NONE : PROT_READ; + page = mmap(NULL, 4096, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + assert(page != MAP_FAILED); + if (exception == exception_translation) { + /* Hopefully nothing will be mapped at this address. */ + err = munmap(page, 4096); + assert(err == 0); + } + addr = page + (val & 0x1ff); + + expected.sig = SIGSEGV; + expected.addr = page; + expected.psw_addr = (unsigned long)func; + expected.exception = exception; + if (func == stg) { + stg(addr, val); + } else { + assert(func == mvc_8); + mvc_8(addr, &val); + } + assert(*addr == val); + + err = munmap(page, 4096); + assert(err == 0); +} + +int main(void) +{ + struct sigaction act; + int err; + + memset(&act, 0, sizeof(act)); + act.sa_sigaction = handle_signal; + act.sa_flags = SA_SIGINFO; + err = sigaction(SIGILL, &act, NULL); + assert(err == 0); + err = sigaction(SIGSEGV, &act, NULL); + assert(err == 0); + + safe_puts("[ RUN ] Operation exception"); + expected.sig = SIGILL; + expected.addr = illegal_op; + expected.psw_addr = (unsigned long)after_illegal_op; + expected.exception = exception_operation; + illegal_op(); + safe_puts("[ OK ]"); + + safe_puts("[ RUN ] Translation exception from stg"); + check_sigsegv(stg, exception_translation, 42); + safe_puts("[ OK ]"); + + safe_puts("[ RUN ] Translation exception from mvc"); + check_sigsegv(mvc_8, exception_translation, 4242); + safe_puts("[ OK ]"); + + safe_puts("[ RUN ] Protection exception from stg"); + check_sigsegv(stg, exception_protection, 424242); + safe_puts("[ OK ]"); + + safe_puts("[ RUN ] Protection exception from mvc"); + check_sigsegv(mvc_8, exception_protection, 42424242); + safe_puts("[ OK ]"); + + safe_puts("[ PASSED ]"); + + _exit(0); +}