61 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */3 4#include <test_progs.h>5#include "pro_epilogue.skel.h"6#include "epilogue_tailcall.skel.h"7#include "pro_epilogue_goto_start.skel.h"8#include "epilogue_exit.skel.h"9 10struct st_ops_args {11 __u64 a;12};13 14static void test_tailcall(void)15{16 LIBBPF_OPTS(bpf_test_run_opts, topts);17 struct epilogue_tailcall *skel;18 struct st_ops_args args;19 int err, prog_fd;20 21 skel = epilogue_tailcall__open_and_load();22 if (!ASSERT_OK_PTR(skel, "epilogue_tailcall__open_and_load"))23 return;24 25 topts.ctx_in = &args;26 topts.ctx_size_in = sizeof(args);27 28 skel->links.epilogue_tailcall =29 bpf_map__attach_struct_ops(skel->maps.epilogue_tailcall);30 if (!ASSERT_OK_PTR(skel->links.epilogue_tailcall, "attach_struct_ops"))31 goto done;32 33 /* Both test_epilogue_tailcall and test_epilogue_subprog are34 * patched with epilogue. When syscall_epilogue_tailcall()35 * is run, test_epilogue_tailcall() is triggered.36 * It executes a tail call and control is transferred to37 * test_epilogue_subprog(). Only test_epilogue_subprog()38 * does args->a += 1, thus final args.a value of 1000139 * guarantees that only the epilogue of the40 * test_epilogue_subprog is executed.41 */42 memset(&args, 0, sizeof(args));43 prog_fd = bpf_program__fd(skel->progs.syscall_epilogue_tailcall);44 err = bpf_prog_test_run_opts(prog_fd, &topts);45 ASSERT_OK(err, "bpf_prog_test_run_opts");46 ASSERT_EQ(args.a, 10001, "args.a");47 ASSERT_EQ(topts.retval, 10001 * 2, "topts.retval");48 49done:50 epilogue_tailcall__destroy(skel);51}52 53void test_pro_epilogue(void)54{55 RUN_TESTS(pro_epilogue);56 RUN_TESTS(pro_epilogue_goto_start);57 RUN_TESTS(epilogue_exit);58 if (test__start_subtest("tailcall"))59 test_tailcall();60}61