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b82bb1ffbb
Enhance linked_funcs selftest with two tricky features that might not
obviously work correctly together. We add CO-RE relocations to entry BPF
programs and mark those programs as non-autoloadable with SEC("?...")
annotation. This makes sure that libbpf itself handles .BTF.ext CO-RE
relocation data matching correctly for SEC("?...") programs, as well as
ensures that BPF static linker handles this correctly (this was the case
before, no changes are necessary, but it wasn't explicitly tested).
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220426004511.2691730-6-andrii@kernel.org
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include <test_progs.h>
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#include <sys/syscall.h>
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#include "linked_funcs.skel.h"
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void test_linked_funcs(void)
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{
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int err;
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struct linked_funcs *skel;
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skel = linked_funcs__open();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return;
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/* handler1 and handler2 are marked as SEC("?raw_tp/sys_enter") and
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* are set to not autoload by default
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*/
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bpf_program__set_autoload(skel->progs.handler1, true);
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bpf_program__set_autoload(skel->progs.handler2, true);
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skel->rodata->my_tid = syscall(SYS_gettid);
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skel->bss->syscall_id = SYS_getpgid;
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err = linked_funcs__load(skel);
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if (!ASSERT_OK(err, "skel_load"))
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goto cleanup;
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err = linked_funcs__attach(skel);
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if (!ASSERT_OK(err, "skel_attach"))
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goto cleanup;
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/* trigger */
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syscall(SYS_getpgid);
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ASSERT_EQ(skel->bss->output_val1, 2000 + 2000, "output_val1");
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ASSERT_EQ(skel->bss->output_ctx1, SYS_getpgid, "output_ctx1");
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ASSERT_EQ(skel->bss->output_weak1, 42, "output_weak1");
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ASSERT_EQ(skel->bss->output_val2, 2 * 1000 + 2 * (2 * 1000), "output_val2");
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ASSERT_EQ(skel->bss->output_ctx2, SYS_getpgid, "output_ctx2");
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/* output_weak2 should never be updated */
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ASSERT_EQ(skel->bss->output_weak2, 0, "output_weak2");
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cleanup:
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linked_funcs__destroy(skel);
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}
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