1 files changed, 60 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/pro_epilogue.c b/tools/testing/selftests/bpf/prog_tests/pro_epilogue.c
new file mode 100644
index 000000000000..509883e6823a
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/pro_epilogue.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
+
+#include <test_progs.h>
+#include "pro_epilogue.skel.h"
+#include "epilogue_tailcall.skel.h"
+#include "pro_epilogue_goto_start.skel.h"
+#include "epilogue_exit.skel.h"
+
+struct st_ops_args {
+	__u64 a;
+};
+
+static void test_tailcall(void)
+{
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+	struct epilogue_tailcall *skel;
+	struct st_ops_args args;
+	int err, prog_fd;
+
+	skel = epilogue_tailcall__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "epilogue_tailcall__open_and_load"))
+		return;
+
+	topts.ctx_in = &args;
+	topts.ctx_size_in = sizeof(args);
+
+	skel->links.epilogue_tailcall =
+		bpf_map__attach_struct_ops(skel->maps.epilogue_tailcall);
+	if (!ASSERT_OK_PTR(skel->links.epilogue_tailcall, "attach_struct_ops"))
+		goto done;
+
+	/* Both test_epilogue_tailcall and test_epilogue_subprog are
+	 * patched with epilogue. When syscall_epilogue_tailcall()
+	 * is run, test_epilogue_tailcall() is triggered.
+	 * It executes a tail call and control is transferred to
+	 * test_epilogue_subprog(). Only test_epilogue_subprog()
+	 * does args->a += 1, thus final args.a value of 10001
+	 * guarantees that only the epilogue of the
+	 * test_epilogue_subprog is executed.
+	 */
+	memset(&args, 0, sizeof(args));
+	prog_fd = bpf_program__fd(skel->progs.syscall_epilogue_tailcall);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "bpf_prog_test_run_opts");
+	ASSERT_EQ(args.a, 10001, "args.a");
+	ASSERT_EQ(topts.retval, 10001 * 2, "topts.retval");
+
+done:
+	epilogue_tailcall__destroy(skel);
+}
+
+void test_pro_epilogue(void)
+{
+	RUN_TESTS(pro_epilogue);
+	RUN_TESTS(pro_epilogue_goto_start);
+	RUN_TESTS(epilogue_exit);
+	if (test__start_subtest("tailcall"))
+		test_tailcall();
+}