1  /*
       2   * Check decoding of prctl PR_GET_UNALIGN/PR_SET_UNALIGN operations.
       3   *
       4   * Copyright (c) 2021 The strace developers.
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: GPL-2.0-or-later
       8   */
       9  
      10  #include "tests.h"
      11  #include "scno.h"
      12  #include <stdio.h>
      13  #include <unistd.h>
      14  #include <linux/prctl.h>
      15  
      16  int
      17  main(void)
      18  {
      19  	TAIL_ALLOC_OBJECT_CONST_PTR(unsigned int, unalign);
      20  	long rc;
      21  
      22  	prctl_marker();
      23  
      24  	rc = syscall(__NR_prctl, PR_SET_UNALIGN, PR_UNALIGN_NOPRINT | PR_UNALIGN_SIGBUS);
      25  	printf("prctl(PR_SET_UNALIGN, PR_UNALIGN_NOPRINT|PR_UNALIGN_SIGBUS) = %s\n",
      26  		   sprintrc(rc));
      27  
      28  	rc = syscall(__NR_prctl, PR_SET_UNALIGN, 0xff00);
      29  	printf("prctl(PR_SET_UNALIGN, %#llx /* PR_UNALIGN_??? */) = %s\n",
      30  		   (unsigned long long) 0xff00, sprintrc(rc));
      31  
      32  	rc = syscall(__NR_prctl, PR_SET_UNALIGN, PR_UNALIGN_SIGBUS);
      33  	printf("prctl(PR_SET_UNALIGN, PR_UNALIGN_SIGBUS) = %s\n", sprintrc(rc));
      34  
      35  	rc = syscall(__NR_prctl, PR_GET_UNALIGN, unalign + 1);
      36  	printf("prctl(PR_GET_UNALIGN, %p) = %s\n", unalign + 1, sprintrc(rc));
      37  
      38  	rc = syscall(__NR_prctl, PR_GET_UNALIGN, NULL);
      39  	printf("prctl(PR_GET_UNALIGN, NULL) = %s\n", sprintrc(rc));
      40  
      41  	rc = syscall(__NR_prctl, PR_GET_UNALIGN, unalign);
      42  	if (rc)
      43  		printf("prctl(PR_GET_UNALIGN, %p) = %s\n", unalign, sprintrc(rc));
      44  	else
      45  		printf("prctl(PR_GET_UNALIGN, [PR_UNALIGN_SIGBUS]) = %s\n",
      46  			   sprintrc(rc));
      47  
      48  	puts("+++ exited with 0 +++");
      49  	return 0;
      50  }