undefined4 rareg(int param_1,uint param_2,undefined4 param_3)

{

  int __fd;

  int *piVar1;

  char *pcVar2;

  void *__addr;

  uint __offset;

  int iVar3;

  undefined4 uVar4;

  undefined4 *puVar5;

  __fd = open("/dev/mem",0x12)   //possible issue identified - semgrep

  if (__fd < 0) {

    piVar1 = __errno_location();

    pcVar2 = strerror(*piVar1);

    printf("open file /dev/mem error. %s\n",pcVar2);

  }

  else {

    __offset = param_2 & 0xfffff000;

    __addr = mmap((void *)0x0,0x1000,3,1,__fd,__offset);

    if (__addr != (void *)0xffffffff) {

      puVar5 = (undefined4 *)((int)__addr + (param_2 - __offset));

      iVar3 = (param_2 - __offset) + __offset;

      verbose("rareg--0x%08x: 0x%08x\n",iVar3,*puVar5);

      if (param_1 == 1) {

        *puVar5 = param_3;

        usleep(100000);

        verbose("rareg write 0x%08x: 0x%08x\n",iVar3,*puVar5);

      }

      uVar4 = *puVar5;

      munmap(__addr,0x1000);

      close(__fd);

      return uVar4;

    }

    piVar1 = __errno_location();

    pcVar2 = strerror(*piVar1);

    printf("mmap() failed at phsical address:%d %s\n",__offset,pcVar2);

    close(__fd);

  }

                    /* WARNING: Subroutine does not return */

  exit(-1);

}