1  /* Check compatibility of legacy executable with a JIT engine.
       2     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stdio.h>
      20  #include <sys/mman.h>
      21  #include <support/xunistd.h>
      22  
      23  /* Check that mmapped legacy code works with -fcf-protection=none.  */
      24  
      25  static int
      26  do_test (void)
      27  {
      28    void (*funcp) (void);
      29    funcp = xmmap (NULL, 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE,
      30  		 MAP_ANONYMOUS | MAP_PRIVATE, -1);
      31    printf ("mmap = %p\n", funcp);
      32    /* Write RET instruction.  */
      33    *(char *) funcp = 0xc3;
      34    funcp ();
      35    return 0;
      36  }
      37  
      38  #include <support/test-driver.c>