1  /*
       2   * Check decoding of prctl PR_GET_TSC/PR_SET_TSC operations.
       3   *
       4   * Copyright (c) 2016 JingPiao Chen <chenjingpiao@foxmail.com>
       5   * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
       6   * Copyright (c) 2016-2021 The strace developers.
       7   * All rights reserved.
       8   *
       9   * SPDX-License-Identifier: GPL-2.0-or-later
      10   */
      11  
      12  #include "tests.h"
      13  #include "scno.h"
      14  #include <stdio.h>
      15  #include <unistd.h>
      16  #include <linux/prctl.h>
      17  
      18  int
      19  main(void)
      20  {
      21  	static const kernel_ulong_t bogus_tsc =
      22  		(kernel_ulong_t) 0xdeadc0defacebeefULL;
      23  
      24  	TAIL_ALLOC_OBJECT_CONST_PTR(int, tsc);
      25  	long rc;
      26  
      27  	prctl_marker();
      28  
      29  	rc = syscall(__NR_prctl, PR_SET_TSC, 0);
      30  	printf("prctl(PR_SET_TSC, 0 /* PR_TSC_??? */) = %s\n", sprintrc(rc));
      31  
      32  	rc = syscall(__NR_prctl, PR_SET_TSC, bogus_tsc);
      33  	printf("prctl(PR_SET_TSC, %#x /* PR_TSC_??? */) = %s\n",
      34  	       (unsigned int) bogus_tsc, sprintrc(rc));
      35  
      36  	rc = syscall(__NR_prctl, PR_SET_TSC, PR_TSC_SIGSEGV);
      37  	printf("prctl(PR_SET_TSC, PR_TSC_SIGSEGV) = %s\n", sprintrc(rc));
      38  
      39  	rc = syscall(__NR_prctl, PR_GET_TSC, NULL);
      40  	printf("prctl(PR_GET_TSC, NULL) = %s\n", sprintrc(rc));
      41  
      42  	rc = syscall(__NR_prctl, PR_GET_TSC, tsc + 1);
      43  	printf("prctl(PR_GET_TSC, %p) = %s\n", tsc + 1, sprintrc(rc));
      44  
      45  	rc = syscall(__NR_prctl, PR_GET_TSC, tsc);
      46  	if (rc)
      47  		printf("prctl(PR_GET_TSC, %p) = %s\n", tsc, sprintrc(rc));
      48  	else
      49  		printf("prctl(PR_GET_TSC, [PR_TSC_SIGSEGV]) = %s\n",
      50  		       sprintrc(rc));
      51  
      52  	puts("+++ exited with 0 +++");
      53  	return 0;
      54  }