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| author | Daniel T. Lee <danieltimlee@gmail.com> | 2020-05-16 06:06:05 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-05-19 17:12:53 +0200 |
| commit | 63841bc0833623ecd4f758ec055b543cf1bc56ba (patch) | |
| tree | c1a534f8aaa1f3ce52712e752fdfd425d77a1eb7 /samples/bpf/trace_common.h | |
| parent | samples, bpf: Refactor pointer error check with libbpf (diff) | |
| download | linux-63841bc0833623ecd4f758ec055b543cf1bc56ba.tar.xz linux-63841bc0833623ecd4f758ec055b543cf1bc56ba.zip | |
samples, bpf: Refactor kprobe tracing user progs with libbpf
Currently, the kprobe BPF program attachment method for bpf_load is
quite old. The implementation of bpf_load "directly" controls and
manages(create, delete) the kprobe events of DEBUGFS. On the other hand,
using using the libbpf automatically manages the kprobe event.
(under bpf_link interface)
By calling bpf_program__attach(_kprobe) in libbpf, the corresponding
kprobe is created and the BPF program will be attached to this kprobe.
To remove this, by simply invoking bpf_link__destroy will clean up the
event.
This commit refactors kprobe tracing programs (tracex{1~7}_user.c) with
libbpf using bpf_link interface and bpf_program__attach.
tracex2_kern.c, which tracks system calls (sys_*), has been modified to
append prefix depending on architecture.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200516040608.1377876-3-danieltimlee@gmail.com
Diffstat (limited to 'samples/bpf/trace_common.h')
| -rw-r--r-- | samples/bpf/trace_common.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/samples/bpf/trace_common.h b/samples/bpf/trace_common.h new file mode 100644 index 000000000000..8cb5400aed1f --- /dev/null +++ b/samples/bpf/trace_common.h @@ -0,0 +1,13 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef __TRACE_COMMON_H +#define __TRACE_COMMON_H + +#ifdef __x86_64__ +#define SYSCALL(SYS) "__x64_" __stringify(SYS) +#elif defined(__s390x__) +#define SYSCALL(SYS) "__s390x_" __stringify(SYS) +#else +#define SYSCALL(SYS) __stringify(SYS) +#endif + +#endif |