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f2644fb44d
Add selftest validating various aspects of statically linking functions:
- no conflicts and correct resolution for name-conflicting static funcs;
- correct resolution of extern functions;
- correct handling of weak functions, both resolution itself and libbpf's
handling of unused weak function that "lost" (it leaves gaps in code with
no ELF symbols);
- correct handling of hidden visibility to turn global function into
"static" for the purpose of BPF verification.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210423181348.1801389-16-andrii@kernel.org
42 lines
1 KiB
C
42 lines
1 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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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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