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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Facebook
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h>
char _license[] SEC("license") = "GPL";
/* shuffled layout for relocatable (CO-RE) reads */
struct callback_head___shuffled {
void (*func)(struct callback_head___shuffled *head);
struct callback_head___shuffled *next;
};
struct callback_head k_probe_in = {};
struct callback_head___shuffled k_core_in = {};
struct callback_head *u_probe_in = 0;
struct callback_head___shuffled *u_core_in = 0;
long k_probe_out = 0;
long u_probe_out = 0;
long k_core_out = 0;
long u_core_out = 0;
int my_pid = 0;
SEC("raw_tracepoint/sys_enter")
int handler(void *ctx)
{
int pid = bpf_get_current_pid_tgid() >> 32;
if (my_pid != pid)
return 0;
/* next pointers for kernel address space have to be initialized from
* BPF side, user-space mmaped addresses are stil user-space addresses
*/
k_probe_in.next = &k_probe_in;
__builtin_preserve_access_index(({k_core_in.next = &k_core_in;}));
k_probe_out = (long)BPF_PROBE_READ(&k_probe_in, next, next, func);
k_core_out = (long)BPF_CORE_READ(&k_core_in, next, next, func);
u_probe_out = (long)BPF_PROBE_READ_USER(u_probe_in, next, next, func);
u_core_out = (long)BPF_CORE_READ_USER(u_core_in, next, next, func);
return 0;
}
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