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bpftool: Apply preserve_access_index attribute to all types in BTF dump

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This patch makes structs and unions, emitted through BTF dump, automatically
CO-RE-relocatable (unless disabled with `#define BPF_NO_PRESERVE_ACCESS_INDEX`,
specified before including generated header file).

This effectivaly turns usual bpf_probe_read() call into equivalent of
bpf_core_read(), by automatically applying builtin_preserve_access_index to
any field accesses of types in generated C types header.

This is especially useful for tp_btf/fentry/fexit BPF program types. They
allow direct memory access, so BPF C code just uses straightfoward a->b->c
access pattern to read data from kernel. But without kernel structs marked as
CO-RE relocatable through preserve_access_index attribute, one has to enclose
all the data reads into a special __builtin_preserve_access_index code block,
like so:

__builtin_preserve_access_index(({
    x = p->pid; /* where p is struct task_struct *, for example */
}));

This is very inconvenient and obscures the logic quite a bit. By marking all
auto-generated types with preserve_access_index attribute the above code is
reduced to just a clean and natural `x = p->pid;`.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200113073143.1779940-5-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-01-12 23:31:41 -08:00 committed by Alexei Starovoitov
parent 2cc51d34d9
commit 1cf5b23988
1 changed files with 8 additions and 0 deletions
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8
tools/bpf/bpftool/btf.c
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@ -370,6 +370,10 @@ static int dump_btf_c(const struct btf *btf,
if (IS_ERR(d)) if (IS_ERR(d))
return PTR_ERR(d); return PTR_ERR(d);
printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n");
printf("#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)\n");
printf("#endif\n\n");
if (root_type_cnt) { if (root_type_cnt) {
for (i = 0; i < root_type_cnt; i++) { for (i = 0; i < root_type_cnt; i++) {
err = btf_dump__dump_type(d, root_type_ids[i]); err = btf_dump__dump_type(d, root_type_ids[i]);
@ -386,6 +390,10 @@ static int dump_btf_c(const struct btf *btf,
} }
} }
printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n");
printf("#pragma clang attribute pop\n");
printf("#endif\n");
done: done:
btf_dump__free(d); btf_dump__free(d);
return err; return err;