61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
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#include <test_progs.h>
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#include "pro_epilogue.skel.h"
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#include "epilogue_tailcall.skel.h"
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#include "pro_epilogue_goto_start.skel.h"
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#include "epilogue_exit.skel.h"
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struct st_ops_args {
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__u64 a;
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};
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static void test_tailcall(void)
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{
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LIBBPF_OPTS(bpf_test_run_opts, topts);
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struct epilogue_tailcall *skel;
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struct st_ops_args args;
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int err, prog_fd;
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skel = epilogue_tailcall__open_and_load();
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if (!ASSERT_OK_PTR(skel, "epilogue_tailcall__open_and_load"))
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return;
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topts.ctx_in = &args;
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topts.ctx_size_in = sizeof(args);
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skel->links.epilogue_tailcall =
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bpf_map__attach_struct_ops(skel->maps.epilogue_tailcall);
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if (!ASSERT_OK_PTR(skel->links.epilogue_tailcall, "attach_struct_ops"))
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goto done;
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/* Both test_epilogue_tailcall and test_epilogue_subprog are
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* patched with epilogue. When syscall_epilogue_tailcall()
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* is run, test_epilogue_tailcall() is triggered.
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* It executes a tail call and control is transferred to
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* test_epilogue_subprog(). Only test_epilogue_subprog()
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* does args->a += 1, thus final args.a value of 10001
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* guarantees that only the epilogue of the
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* test_epilogue_subprog is executed.
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*/
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memset(&args, 0, sizeof(args));
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prog_fd = bpf_program__fd(skel->progs.syscall_epilogue_tailcall);
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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ASSERT_OK(err, "bpf_prog_test_run_opts");
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ASSERT_EQ(args.a, 10001, "args.a");
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ASSERT_EQ(topts.retval, 10001 * 2, "topts.retval");
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done:
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epilogue_tailcall__destroy(skel);
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}
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void test_pro_epilogue(void)
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{
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RUN_TESTS(pro_epilogue);
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RUN_TESTS(pro_epilogue_goto_start);
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RUN_TESTS(epilogue_exit);
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if (test__start_subtest("tailcall"))
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test_tailcall();
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}
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