#define _GNU_SOURCE

#include <endian.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef __NR_memfd_secret
#define __NR_memfd_secret 447
#endif

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

static long syz_memcpy_off(volatile long a0, volatile long a1, volatile long a2,
                           volatile long a3, volatile long a4)
{
  char* dest = (char*)a0;
  uint32_t dest_off = (uint32_t)a1;
  char* src = (char*)a2;
  uint32_t src_off = (uint32_t)a3;
  size_t n = (size_t)a4;
  return (long)memcpy(dest + dest_off, src + src_off, n);
}

uint64_t r[2] = {0xffffffffffffffff, 0x0};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  intptr_t res = 0;
  *(uint32_t*)0x20000d80 = 0;
  *(uint32_t*)0x20000d84 = 0x80;
  *(uint8_t*)0x20000d88 = 0;
  *(uint8_t*)0x20000d89 = 0;
  *(uint8_t*)0x20000d8a = 0;
  *(uint8_t*)0x20000d8b = 0;
  *(uint32_t*)0x20000d8c = 0;
  *(uint64_t*)0x20000d90 = 0;
  *(uint64_t*)0x20000d98 = 0;
  *(uint64_t*)0x20000da0 = 8;
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 0, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 1, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 2, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 3, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 4, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 5, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 6, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 7, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 8, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 9, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 10, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 11, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 12, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 13, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 14, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 15, 2);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 17, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 18, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 19, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 20, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 21, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 22, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 23, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 24, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 25, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 26, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 27, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 28, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 29, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 30, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 31, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 32, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 33, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 1, 34, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 35, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 36, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 37, 1);
  STORE_BY_BITMASK(uint64_t, , 0x20000da8, 0, 38, 26);
  *(uint32_t*)0x20000db0 = 0;
  *(uint32_t*)0x20000db4 = 0;
  *(uint64_t*)0x20000db8 = 0;
  *(uint64_t*)0x20000dc0 = 0;
  *(uint64_t*)0x20000dc8 = 0;
  *(uint64_t*)0x20000dd0 = 0;
  *(uint32_t*)0x20000dd8 = 0;
  *(uint32_t*)0x20000ddc = 0;
  *(uint64_t*)0x20000de0 = 0;
  *(uint32_t*)0x20000de8 = 0;
  *(uint16_t*)0x20000dec = 0x46e;
  *(uint16_t*)0x20000dee = 0;
  *(uint32_t*)0x20000df0 = 0;
  *(uint32_t*)0x20000df4 = 0;
  *(uint64_t*)0x20000df8 = 0;
  syscall(__NR_perf_event_open, /*attr=*/0x20000d80ul, /*fd=*/-1, /*cpu=*/0ul,
          /*group=*/-1, /*flags=*/0ul);
  res = syscall(__NR_memfd_secret, /*flags=*/0ul);
  if (res != -1)
    r[0] = res;
  syscall(__NR_ftruncate, /*fd=*/r[0], /*len=*/6ul);
  res = syscall(
      __NR_mmap, /*addr=*/0x20ffc000ul, /*len=*/0x3000ul,
      /*prot=PROT_GROWSUP|PROT_SEM|PROT_WRITE|PROT_READ|0x800000*/ 0x280000bul,
      /*flags=MAP_NORESERVE|MAP_FIXED|MAP_SHARED*/ 0x4011ul, /*fd=*/r[0],
      /*offset=*/0ul);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x20000040 = 0;
  syz_memcpy_off(/*ring_ptr=*/r[1], /*flag_off=*/0, /*src=*/0x20000040,
                 /*src_off=*/0, /*nbytes=*/4);
  syscall(__NR_mmap, /*addr=*/0x20ae4000ul, /*len=*/0x1000ul,
          /*prot=PROT_GROWSUP|PROT_GROWSDOWN|PROT_SEM|PROT_WRITE*/ 0x300000aul,
          /*flags=MAP_FIXED|MAP_SHARED*/ 0x11ul, /*fd=*/r[0], /*offset=*/0ul);
  return 0;
}