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Tue, 3 May 2022 22:52:03 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D385AA4054; Tue, 3 May 2022 22:52:02 +0000 (GMT) Received: from heavy.ibmuc.com (unknown [9.171.50.79]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 3 May 2022 22:52:02 +0000 (GMT) From: Ilya Leoshkevich To: Richard Henderson , David Hildenbrand , Laurent Vivier Cc: qemu-s390x@nongnu.org, qemu-devel@nongnu.org, Christian Borntraeger , Ulrich Weigand , Ilya Leoshkevich Subject: [PATCH 2/2] tests/tcg/s390x: Test unwinding from signal handlers Date: Wed, 4 May 2022 00:51:57 +0200 Message-Id: <20220503225157.1696774-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220503225157.1696774-1-iii@linux.ibm.com> References: <20220503225157.1696774-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: s3sGEsFwoa7iM6w6DvmWaFybHBlwItJZ X-Proofpoint-GUID: 2fyxJPmNPDjjl9ZpQJv5zt0vdzxY3z-k X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-03_09,2022-05-02_03,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1011 bulkscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 mlxscore=0 phishscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2205030136 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" Add a small test to prevent regressions. Signed-off-by: Ilya Leoshkevich Acked-by: Thomas Huth --- tests/tcg/s390x/signals-s390x.c | 69 ++++++++++++++++++++++++++------- 1 file changed, 55 insertions(+), 14 deletions(-) diff --git a/tests/tcg/s390x/signals-s390x.c b/tests/tcg/s390x/signals-s390x.c index dc2f8ee59a..48c3b6cdfd 100644 --- a/tests/tcg/s390x/signals-s390x.c +++ b/tests/tcg/s390x/signals-s390x.c @@ -1,4 +1,5 @@ #include +#include #include #include #include @@ -11,22 +12,28 @@ * inline asm is used instead. */ +#define DEFINE_ASM_FUNCTION(name, body) \ + asm(".globl " #name "\n" \ + #name ":\n" \ + ".cfi_startproc\n" \ + body "\n" \ + "br %r14\n" \ + ".cfi_endproc"); + 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"); +extern const char after_illegal_op; +DEFINE_ASM_FUNCTION(illegal_op, + ".byte 0x00,0x00\n" + ".globl after_illegal_op\n" + "after_illegal_op:") void stg(void *dst, unsigned long src); -asm(".globl\tstg\n" - "stg:\tstg\t%r3,0(%r2)\n" - "\tbr\t%r14"); +DEFINE_ASM_FUNCTION(stg, "stg %r3,0(%r2)") void mvc_8(void *dst, void *src); -asm(".globl\tmvc_8\n" - "mvc_8:\tmvc\t0(8,%r2),0(%r3)\n" - "\tbr\t%r14"); +DEFINE_ASM_FUNCTION(mvc_8, "mvc 0(8,%r2),0(%r3)") + +extern const char return_from_main_1; static void safe_puts(const char *s) { @@ -49,8 +56,9 @@ static struct { static void handle_signal(int sig, siginfo_t *info, void *ucontext) { + int err, i, n_frames; + void *frames[16]; void *page; - int err; if (sig != expected.sig) { safe_puts("[ FAILED ] wrong signal"); @@ -86,6 +94,17 @@ static void handle_signal(int sig, siginfo_t *info, void *ucontext) default: break; } + + n_frames = backtrace(frames, sizeof(frames) / sizeof(frames[0])); + for (i = 0; i < n_frames; i++) { + if (frames[i] == &return_from_main_1) { + break; + } + } + if (i == n_frames) { + safe_puts("[ FAILED ] backtrace() is broken"); + _exit(1); + } } static void check_sigsegv(void *func, enum exception exception, @@ -122,7 +141,7 @@ static void check_sigsegv(void *func, enum exception exception, assert(err == 0); } -int main(void) +int main_1(void) { struct sigaction act; int err; @@ -138,7 +157,7 @@ int main(void) safe_puts("[ RUN ] Operation exception"); expected.sig = SIGILL; expected.addr = illegal_op; - expected.psw_addr = (unsigned long)after_illegal_op; + expected.psw_addr = (unsigned long)&after_illegal_op; expected.exception = exception_operation; illegal_op(); safe_puts("[ OK ]"); @@ -163,3 +182,25 @@ int main(void) _exit(0); } + +/* + * Define main() in assembly in order to test that unwinding from signal + * handlers until main() works. This way we can define a specific point that + * the unwinder should reach. This is also better than defining main() in C + * and using inline assembly to call main_1(), since it's not easy to get all + * the clobbers right. + */ + +DEFINE_ASM_FUNCTION(main, + "stmg %r14,%r15,112(%r15)\n" + ".cfi_offset 14,-48\n" + ".cfi_offset 15,-40\n" + "lay %r15,-160(%r15)\n" + ".cfi_def_cfa_offset 320\n" + "brasl %r14,main_1\n" + ".globl return_from_main_1\n" + "return_from_main_1:\n" + "lmg %r14,%r15,272(%r15)\n" + ".cfi_restore 15\n" + ".cfi_restore 14\n" + ".cfi_def_cfa_offset 160");