linux-stable/tools/testing/selftests/bpf/prog_tests/static_linked.c
Andrii Nakryiko a0964f526d selftests/bpf: Add multi-file statically linked BPF object file test
Add Makefile infra to specify multi-file BPF object files (and derivative
skeletons). Add first selftest validating BPF static linker can merge together
successfully two independent BPF object files and resulting object and
skeleton are correct and usable.

Use the same F(F(F(X))) = F(F(X)) identity test on linked object files as for
the case of single BPF object files.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210318194036.3521577-13-andrii@kernel.org
2021-03-18 16:14:23 -07:00

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C

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
#include "test_static_linked.skel.h"
void test_static_linked(void)
{
int err;
struct test_static_linked* skel;
skel = test_static_linked__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
skel->rodata->rovar1 = 1;
skel->bss->static_var1 = 2;
skel->bss->static_var11 = 3;
skel->rodata->rovar2 = 4;
skel->bss->static_var2 = 5;
skel->bss->static_var22 = 6;
err = test_static_linked__load(skel);
if (!ASSERT_OK(err, "skel_load"))
goto cleanup;
err = test_static_linked__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto cleanup;
/* trigger */
usleep(1);
ASSERT_EQ(skel->bss->var1, 1 * 2 + 2 + 3, "var1");
ASSERT_EQ(skel->bss->var2, 4 * 3 + 5 + 6, "var2");
cleanup:
test_static_linked__destroy(skel);
}