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selftests/bpf: add CO-RE relocs struct flavors tests

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Add tests verifying that BPF program can use various struct/union
"flavors" to extract data from the same target struct/union.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2019-08-07 14:39:54 -07:00
committed by Alexei Starovoitov
parent df36e62141
commit 002d3afce6
5 changed files with 117 additions and 0 deletions
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3
tools/testing/selftests/bpf/progs/btf__core_reloc_flavors.c Normal file
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#include "core_reloc_types.h"
void f(struct core_reloc_flavors x) {}

3
tools/testing/selftests/bpf/progs/btf__core_reloc_flavors__err_wrong_name.c Normal file
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#include "core_reloc_types.h"
void f(struct core_reloc_flavors__err_wrong_name x) {}

15
tools/testing/selftests/bpf/progs/core_reloc_types.h Normal file
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@@ -0,0 +1,15 @@
/*
* FLAVORS
*/
struct core_reloc_flavors {
int a;
int b;
int c;
};
/* this is not a flavor, as it doesn't have triple underscore */
struct core_reloc_flavors__err_wrong_name {
int a;
int b;
int c;
};

62
tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c Normal file
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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include <linux/bpf.h>
#include <stdint.h>
#include "bpf_helpers.h"
char _license[] SEC("license") = "GPL";
static volatile struct data {
char in[256];
char out[256];
} data;
struct core_reloc_flavors {
int a;
int b;
int c;
};
/* local flavor with reversed layout */
struct core_reloc_flavors___reversed {
int c;
int b;
int a;
};
/* local flavor with nested/overlapping layout */
struct core_reloc_flavors___weird {
struct {
int b;
};
/* a and c overlap in local flavor, but this should still work
* correctly with target original flavor
*/
union {
int a;
int c;
};
};
SEC("raw_tracepoint/sys_enter")
int test_core_flavors(void *ctx)
{
struct core_reloc_flavors *in_orig = (void *)&data.in;
struct core_reloc_flavors___reversed *in_rev = (void *)&data.in;
struct core_reloc_flavors___weird *in_weird = (void *)&data.in;
struct core_reloc_flavors *out = (void *)&data.out;
/* read a using weird layout */
if (BPF_CORE_READ(&out->a, &in_weird->a))
return 1;
/* read b using reversed layout */
if (BPF_CORE_READ(&out->b, &in_rev->b))
return 1;
/* read c using original layout */
if (BPF_CORE_READ(&out->c, &in_orig->c))
return 1;
return 0;
}