// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */

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

#if (defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \
     (defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64) ||       \
     defined(__TARGET_ARCH_s390) || defined(__TARGET_ARCH_loongarch)) && \
     __clang_major__ >= 18
const volatile int skip = 0;
#else
const volatile int skip = 1;
#endif

volatile const short val1 = -1;
volatile const int val2 = -1;
short val3 = -1;
int val4 = -1;
int done1, done2, ret1, ret2;

SEC("?raw_tp/sys_enter")
int rdonly_map_prog(const void *ctx)
{
        if (done1)
                return 0;

        done1 = 1;
        /* val1/val2 readonly map */
        if (val1 == val2)
                ret1 = 1;
        return 0;

}

SEC("?raw_tp/sys_enter")
int map_val_prog(const void *ctx)
{
        if (done2)
                return 0;

        done2 = 1;
        /* val1/val2 regular read/write map */
        if (val3 == val4)
                ret2 = 1;
        return 0;

}

struct bpf_testmod_struct_arg_1 {
        int a;
};

long long int_member;

SEC("?fentry/bpf_testmod_test_arg_ptr_to_struct")
int BPF_PROG2(test_ptr_struct_arg, struct bpf_testmod_struct_arg_1 *, p)
{
        /* probed memory access */
        int_member = p->a;
        return 0;
}

long long set_optlen, set_retval;

SEC("?cgroup/getsockopt")
int _getsockopt(volatile struct bpf_sockopt *ctx)
{
        int old_optlen, old_retval;

        old_optlen = ctx->optlen;
        old_retval = ctx->retval;

        ctx->optlen = -1;
        ctx->retval = -1;

        /* sign extension for ctx member */
        set_optlen = ctx->optlen;
        set_retval = ctx->retval;

        ctx->optlen = old_optlen;
        ctx->retval = old_retval;

        return 0;
}

long long set_mark;

SEC("?tc")
int _tc(volatile struct __sk_buff *skb)
{
        long long tmp_mark;
        int old_mark;

        old_mark = skb->mark;

        skb->mark = 0xf6fe;

        /* narrowed sign extension for ctx member */
#if __clang_major__ >= 18
        /* force narrow one-byte signed load. Otherwise, compiler may
         * generate a 32-bit unsigned load followed by an s8 movsx.
         */
        asm volatile ("r1 = *(s8 *)(%[ctx] + %[off_mark])\n\t"
                      "%[tmp_mark] = r1"
                      : [tmp_mark]"=r"(tmp_mark)
                      : [ctx]"r"(skb),
                        [off_mark]"i"(offsetof(struct __sk_buff, mark)
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
                        + sizeof(skb->mark) - 1
#endif
                        )
                      : "r1");
#else
        tmp_mark = (char)skb->mark;
#endif
        set_mark = tmp_mark;

        skb->mark = old_mark;

        return 0;
}

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