[LTP] [PATCH v2] rseq01: basic test rseq

[Wei Gao]

Add basic check for the newly added glibc API in LTP.
This test references the glibc test case tst-rseq.c.

Signed-off-by: Wei Gao <wegao@suse.com>
---
 configure.ac                              |  1 +
 include/lapi/rseq.h                       | 57 +++++++++++++++++++++++
 runtest/syscalls                          |  2 +
 testcases/kernel/syscalls/rseq/.gitignore |  1 +
 testcases/kernel/syscalls/rseq/Makefile   |  7 +++
 testcases/kernel/syscalls/rseq/rseq01.c   | 28 +++++++++++
 6 files changed, 96 insertions(+)
 create mode 100644 include/lapi/rseq.h
 create mode 100644 testcases/kernel/syscalls/rseq/.gitignore
 create mode 100644 testcases/kernel/syscalls/rseq/Makefile
 create mode 100644 testcases/kernel/syscalls/rseq/rseq01.c

diff --git a/configure.ac b/configure.ac
index c2b0f48e7..43b9ca3ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,6 +80,7 @@ AC_CHECK_HEADERS_ONCE([ \
     sys/utsname.h \
     sys/xattr.h \
     xfs/xqm.h \
+    sys/rseq.h \
 ])
 AC_CHECK_HEADERS(fts.h, [have_fts=1])
 AC_SUBST(HAVE_FTS_H, $have_fts)
diff --git a/include/lapi/rseq.h b/include/lapi/rseq.h
new file mode 100644
index 000000000..7f4834f2c
--- /dev/null
+++ b/include/lapi/rseq.h
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021-2023 Free Software Foundation, Inc.
+ * Copyright (c) 2023 Wei Gao <wegao@suse.com>
+ */
+
+#ifndef LAPI_RSEQ_H__
+#define LAPI_RSEQ_H__
+
+#include <errno.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syscall.h>
+#include "config.h"
+#include "tst_test.h"
+
+
+#if defined(HAVE_SYS_RSEQ_H)
+# include <sys/rseq.h>
+#endif
+
+
+#if defined(HAVE_SYS_RSEQ_H) && defined(RSEQ_SIG)
+static int sys_rseq(struct rseq *rseq_abi, uint32_t rseq_len, int flags, uint32_t sig)
+{
+	return syscall(__NR_rseq, rseq_abi, rseq_len, flags, sig);
+}
+
+static void check_rseq_available(void)
+{
+	int rc;
+
+	rc = sys_rseq(NULL, 0, 0, 0);
+	if (rc != -1)
+		tst_brk(TFAIL | TTERRNO, "Unexpected rseq return value %d ", rc);
+	switch (errno) {
+	case ENOSYS:
+		tst_brk(TCONF,
+				"kernel does not support rseq, skipping test");
+	case EINVAL:
+		/* rseq is implemented, but detected an invalid rseq_len parameter.  */
+		break;
+	default:
+		tst_brk(TFAIL | TTERRNO, "Unexpected rseq error ");
+	}
+}
+#else /* HAVE_SYS_RSEQ_H && RSEQ_SIG */
+static void check_rseq_available(void)
+{
+	tst_brk(TCONF,
+		"glibc does not support rseq, skipping test");
+}
+#endif /* HAVE_SYS_RSEQ_H && RSEQ_SIG */
+
+#endif /* LAPI_RSEQ_H__ */
diff --git a/runtest/syscalls b/runtest/syscalls
index ae37a1192..f46950b27 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1752,6 +1752,8 @@ copy_file_range01 copy_file_range01
 copy_file_range02 copy_file_range02
 copy_file_range03 copy_file_range03
 
+rseq01 rseq01
+
 statx01 statx01
 statx02 statx02
 statx03 statx03
diff --git a/testcases/kernel/syscalls/rseq/.gitignore b/testcases/kernel/syscalls/rseq/.gitignore
new file mode 100644
index 000000000..8a6c7ee36
--- /dev/null
+++ b/testcases/kernel/syscalls/rseq/.gitignore
@@ -0,0 +1 @@
+/rseq01
diff --git a/testcases/kernel/syscalls/rseq/Makefile b/testcases/kernel/syscalls/rseq/Makefile
new file mode 100644
index 000000000..159d5651c
--- /dev/null
+++ b/testcases/kernel/syscalls/rseq/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#  Copyright (C) 2012 Linux Test Project, Inc.
+
+top_srcdir		?= ../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/syscalls/rseq/rseq01.c b/testcases/kernel/syscalls/rseq/rseq01.c
new file mode 100644
index 000000000..6f3e7ff97
--- /dev/null
+++ b/testcases/kernel/syscalls/rseq/rseq01.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021-2023 Free Software Foundation, Inc.
+ * Copyright (c) 2023 Wei Gao <wegao@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Restartable Sequences basic tests.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sched.h>
+#include "lapi/rseq.h"
+
+static void run(void)
+{
+	check_rseq_available();
+
+	TST_EXP_PASS(!(sched_getcpu() >= 0));
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.needs_root = 1,
+};
-- 
2.35.3