1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include "vmlinux.h"
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_tracing.h>
6 
7 #define PT_REGS_SIZE sizeof(struct pt_regs)
8 
9 /*
10  * The kernel struct pt_regs isn't exported in its entirety to userspace.
11  * Pass it as an array to task_pt_regs.c
12  */
13 char current_regs[PT_REGS_SIZE] = {};
14 char ctx_regs[PT_REGS_SIZE] = {};
15 int uprobe_res = 0;
16 
17 SEC("uprobe")
18 int handle_uprobe(struct pt_regs *ctx)
19 {
20 	struct task_struct *current;
21 	struct pt_regs *regs;
22 
23 	current = bpf_get_current_task_btf();
24 	regs = (struct pt_regs *) bpf_task_pt_regs(current);
25 	if (bpf_probe_read_kernel(current_regs, PT_REGS_SIZE, regs))
26 		return 0;
27 	if (bpf_probe_read_kernel(ctx_regs, PT_REGS_SIZE, ctx))
28 		return 0;
29 
30 	/* Prove that uprobe was run */
31 	uprobe_res = 1;
32 
33 	return 0;
34 }
35 
36 char _license[] SEC("license") = "GPL";
37