// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */

#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include "../test_kmods/bpf_testmod.h"

__u32 sz = 0;

SEC("?raw_tp/bpf_testmod_test_read")
int BPF_PROG(handle_raw_tp,
             struct task_struct *task, struct bpf_testmod_test_read_ctx *read_ctx)
{
        sz = BPF_CORE_READ(read_ctx, len);
        return 0;
}

SEC("?raw_tp/bpf_testmod_test_write_bare_tp")
int BPF_PROG(handle_raw_tp_bare,
             struct task_struct *task, struct bpf_testmod_test_write_ctx *write_ctx)
{
        sz = BPF_CORE_READ(write_ctx, len);
        return 0;
}

int raw_tp_writable_bare_in_val = 0;
int raw_tp_writable_bare_early_ret = 0;
int raw_tp_writable_bare_out_val = 0;

SEC("?raw_tp.w/bpf_testmod_test_writable_bare_tp")
int BPF_PROG(handle_raw_tp_writable_bare,
             struct bpf_testmod_test_writable_ctx *writable)
{
        raw_tp_writable_bare_in_val = writable->val;
        writable->early_ret = raw_tp_writable_bare_early_ret;
        writable->val = raw_tp_writable_bare_out_val;
        return 0;
}

SEC("?tp_btf/bpf_testmod_test_read")
int BPF_PROG(handle_tp_btf,
             struct task_struct *task, struct bpf_testmod_test_read_ctx *read_ctx)
{
        sz = read_ctx->len;
        return 0;
}

SEC("?fentry/bpf_testmod_test_read")
int BPF_PROG(handle_fentry,
             struct file *file, struct kobject *kobj,
             struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)
{
        sz = len;
        return 0;
}

SEC("?fentry")
int BPF_PROG(handle_fentry_manual,
             struct file *file, struct kobject *kobj,
             struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)
{
        sz = len;
        return 0;
}

SEC("?fentry/bpf_testmod:bpf_testmod_test_read")
int BPF_PROG(handle_fentry_explicit,
             struct file *file, struct kobject *kobj,
             struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)
{
        sz = len;
        return 0;
}


SEC("?fentry")
int BPF_PROG(handle_fentry_explicit_manual,
             struct file *file, struct kobject *kobj,
             struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)
{
        sz = len;
        return 0;
}

int retval = 0;

SEC("?fexit/bpf_testmod_test_read")
int BPF_PROG(handle_fexit,
             struct file *file, struct kobject *kobj,
             struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len,
             int ret)
{
        sz = len;
        retval = ret;
        return 0;
}

SEC("?fexit/bpf_testmod_return_ptr")
int BPF_PROG(handle_fexit_ret, int arg, struct file *ret)
{
        long buf = 0;

        bpf_probe_read_kernel(&buf, 8, ret);
        bpf_probe_read_kernel(&buf, 8, (char *)ret + 256);
        *(volatile int *)ret;
        *(volatile int *)&ret->f_mode;
        return 0;
}

SEC("?fmod_ret/bpf_testmod_test_read")
int BPF_PROG(handle_fmod_ret,
             struct file *file, struct kobject *kobj,
             struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)
{
        sz = len;
        return 0; /* don't override the exit code */
}

SEC("?kprobe.multi/bpf_testmod_test_read")
int BPF_PROG(kprobe_multi)
{
        return 0;
}

char _license[] SEC("license") = "GPL";