2 * Check decoding of prctl PR_GET_TSC/PR_SET_TSC operations.
4 * Copyright (c) 2016 JingPiao Chen <chenjingpiao@foxmail.com>
5 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include <asm/unistd.h>
33 #include <linux/prctl.h>
35 #if defined __NR_prctl && defined PR_GET_TSC && defined PR_SET_TSC
43 static const kernel_ulong_t bogus_tsc =
44 (kernel_ulong_t) 0xdeadc0defacebeefULL;
46 TAIL_ALLOC_OBJECT_CONST_PTR(int, tsc);
49 rc = syscall(__NR_prctl, PR_SET_TSC, 0);
50 printf("prctl(PR_SET_TSC, 0 /* PR_TSC_??? */) = %s\n", sprintrc(rc));
52 rc = syscall(__NR_prctl, PR_SET_TSC, bogus_tsc);
53 printf("prctl(PR_SET_TSC, %#x /* PR_TSC_??? */) = %s\n",
54 (unsigned int) bogus_tsc, sprintrc(rc));
56 rc = syscall(__NR_prctl, PR_SET_TSC, PR_TSC_SIGSEGV);
57 printf("prctl(PR_SET_TSC, PR_TSC_SIGSEGV) = %s\n", sprintrc(rc));
59 rc = syscall(__NR_prctl, PR_GET_TSC, NULL);
60 printf("prctl(PR_GET_TSC, NULL) = %s\n", sprintrc(rc));
62 rc = syscall(__NR_prctl, PR_GET_TSC, tsc + 1);
63 printf("prctl(PR_GET_TSC, %p) = %s\n", tsc + 1, sprintrc(rc));
65 rc = syscall(__NR_prctl, PR_GET_TSC, tsc);
67 printf("prctl(PR_GET_TSC, %p) = %s\n", tsc, sprintrc(rc));
69 printf("prctl(PR_GET_TSC, [PR_TSC_SIGSEGV]) = %s\n",
72 puts("+++ exited with 0 +++");
78 SKIP_MAIN_UNDEFINED("__NR_prctl && PR_GET_TSC && PR_SET_TSC")