// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
 * Copyright (C) 2023 The Falco Authors.
 *
 * This file is dual licensed under either the MIT or GPL 2. See MIT.txt
 * or GPL2.txt for full copies of the license.
 */

#include <helpers/interfaces/fixed_size_event.h>
#include <helpers/interfaces/variable_size_event.h>

/*=============================== ENTER EVENT ===========================*/

SEC("tp_btf/sys_enter")
int BPF_PROG(init_module_e, struct pt_regs *regs, long id) {
	struct ringbuf_struct ringbuf;
	if(!ringbuf__reserve_space(&ringbuf, INIT_MODULE_E_SIZE, PPME_SYSCALL_INIT_MODULE_E)) {
		return 0;
	}

	ringbuf__store_event_header(&ringbuf);

	/*=============================== COLLECT PARAMETERS  ===========================*/

	// Here we have no parameters to collect.

	/*=============================== COLLECT PARAMETERS  ===========================*/

	ringbuf__submit_event(&ringbuf);

	return 0;
}

/*=============================== ENTER EVENT ===========================*/

/*=============================== EXIT EVENT ===========================*/

SEC("tp_btf/sys_exit")
int BPF_PROG(init_module_x, struct pt_regs *regs, long ret) {
	struct auxiliary_map *auxmap = auxmap__get();
	if(!auxmap) {
		return 0;
	}

	auxmap__preload_event_header(auxmap, PPME_SYSCALL_INIT_MODULE_X);

	/*=============================== COLLECT PARAMETERS  ===========================*/

	/* Parameter 1: ret (type: PT_ERRNO) */
	auxmap__store_s64_param(auxmap, ret);

	uint64_t len = extract__syscall_argument(regs, 1);

	/* Parameter 2: img (type: PT_BYTEBUF) */
	unsigned long img_ptr = extract__syscall_argument(regs, 0);
	auxmap__store_bytebuf_param(auxmap, img_ptr, len, USER);

	/* Parameter 3: length (type: PT_UINT64) */
	auxmap__store_u64_param(auxmap, (uint64_t)len);

	/* Parameter 4: uargs (type: PT_CHARBUF) */
	unsigned long uargs_ptr = extract__syscall_argument(regs, 2);
	auxmap__store_charbuf_param(auxmap, uargs_ptr, MAX_PROC_ARG_ENV, USER);

	/*=============================== COLLECT PARAMETERS  ===========================*/

	auxmap__finalize_event_header(auxmap);

	auxmap__submit_event(auxmap);

	return 0;
}

/*=============================== EXIT EVENT ===========================*/
