forked from Minki/linux
3677d0a131
For the problem of increasing fragmentation of the bpf loader programs,
instead of using bpf_loader.o, which is used in samples/bpf, this
commit refactors the existing kprobe tracing programs with libbbpf
bpf loader.
- For kprobe events pointing to system calls, the SYSCALL() macro in
trace_common.h was used.
- Adding a kprobe event and attaching a bpf program to it was done
through bpf_program_attach().
- Instead of using the existing BPF MAP definition, MAP definition
has been refactored with the new BTF-defined MAP format.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200823085334.9413-3-danieltimlee@gmail.com
32 lines
660 B
C
32 lines
660 B
C
#include <linux/ptrace.h>
|
|
#include <linux/version.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include "trace_common.h"
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
|
|
__uint(key_size, sizeof(int));
|
|
__uint(value_size, sizeof(u32));
|
|
__uint(max_entries, 2);
|
|
} my_map SEC(".maps");
|
|
|
|
SEC("kprobe/" SYSCALL(sys_write))
|
|
int bpf_prog1(struct pt_regs *ctx)
|
|
{
|
|
struct S {
|
|
u64 pid;
|
|
u64 cookie;
|
|
} data;
|
|
|
|
data.pid = bpf_get_current_pid_tgid();
|
|
data.cookie = 0x12345678;
|
|
|
|
bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
|
|
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|