1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2022, Oracle and/or its affiliates. */ 3 4 #include "vmlinux.h" 5 6 #include <bpf/bpf_helpers.h> 7 #include <bpf/bpf_tracing.h> 8 #include "bpf_misc.h" 9 10 __u32 perfbuf_val = 0; 11 __u32 ringbuf_val = 0; 12 13 int test_pid; 14 15 struct { 16 __uint(type, BPF_MAP_TYPE_ARRAY); 17 __uint(max_entries, 1); 18 __type(key, __u32); 19 __type(value, __u32); 20 } array SEC(".maps"); 21 22 struct { 23 __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); 24 __uint(max_entries, 1); 25 __type(key, __u32); 26 __type(value, __u32); 27 } percpu_array SEC(".maps"); 28 29 struct { 30 __uint(type, BPF_MAP_TYPE_HASH); 31 __uint(max_entries, 1); 32 __type(key, __u32); 33 __type(value, __u32); 34 } hash SEC(".maps"); 35 36 struct { 37 __uint(type, BPF_MAP_TYPE_PERCPU_HASH); 38 __uint(max_entries, 1); 39 __type(key, __u32); 40 __type(value, __u32); 41 } percpu_hash SEC(".maps"); 42 43 struct { 44 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); 45 __type(key, __u32); 46 __type(value, __u32); 47 } perfbuf SEC(".maps"); 48 49 struct { 50 __uint(type, BPF_MAP_TYPE_RINGBUF); 51 __uint(max_entries, 1 << 12); 52 } ringbuf SEC(".maps"); 53 54 struct { 55 __uint(type, BPF_MAP_TYPE_PROG_ARRAY); 56 __uint(max_entries, 1); 57 __uint(key_size, sizeof(__u32)); 58 __uint(value_size, sizeof(__u32)); 59 } prog_array SEC(".maps"); 60 61 SEC("fentry/" SYS_PREFIX "sys_nanosleep") 62 int sys_nanosleep_enter(void *ctx) 63 { 64 int cur_pid; 65 66 cur_pid = bpf_get_current_pid_tgid() >> 32; 67 68 if (cur_pid != test_pid) 69 return 0; 70 71 bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU, &perfbuf_val, sizeof(perfbuf_val)); 72 bpf_ringbuf_output(&ringbuf, &ringbuf_val, sizeof(ringbuf_val), 0); 73 74 return 0; 75 } 76 77 SEC("perf_event") 78 int handle_perf_event(void *ctx) 79 { 80 return 0; 81 } 82 83 char _license[] SEC("license") = "GPL"; 84