xref: /OK3568_Linux_fs/kernel/samples/bpf/trace_output_kern.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun #include <linux/ptrace.h>
2*4882a593Smuzhiyun #include <linux/version.h>
3*4882a593Smuzhiyun #include <uapi/linux/bpf.h>
4*4882a593Smuzhiyun #include <bpf/bpf_helpers.h>
5*4882a593Smuzhiyun #include "trace_common.h"
6*4882a593Smuzhiyun 
7*4882a593Smuzhiyun struct {
8*4882a593Smuzhiyun 	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
9*4882a593Smuzhiyun 	__uint(key_size, sizeof(int));
10*4882a593Smuzhiyun 	__uint(value_size, sizeof(u32));
11*4882a593Smuzhiyun 	__uint(max_entries, 2);
12*4882a593Smuzhiyun } my_map SEC(".maps");
13*4882a593Smuzhiyun 
SYSCALL(sys_write)14*4882a593Smuzhiyun SEC("kprobe/" SYSCALL(sys_write))
15*4882a593Smuzhiyun int bpf_prog1(struct pt_regs *ctx)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun 	struct S {
18*4882a593Smuzhiyun 		u64 pid;
19*4882a593Smuzhiyun 		u64 cookie;
20*4882a593Smuzhiyun 	} data;
21*4882a593Smuzhiyun 
22*4882a593Smuzhiyun 	data.pid = bpf_get_current_pid_tgid();
23*4882a593Smuzhiyun 	data.cookie = 0x12345678;
24*4882a593Smuzhiyun 
25*4882a593Smuzhiyun 	bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
26*4882a593Smuzhiyun 
27*4882a593Smuzhiyun 	return 0;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun 
30*4882a593Smuzhiyun char _license[] SEC("license") = "GPL";
31*4882a593Smuzhiyun u32 _version SEC("version") = LINUX_VERSION_CODE;
32