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Linux/Documentation/prctl/disable-tsc-test.c

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  1 /*
  2  * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...)
  3  *
  4  * Basic test to test behaviour of PR_GET_TSC and PR_SET_TSC
  5  */
  6 
  7 #include <stdio.h>
  8 #include <stdlib.h>
  9 #include <unistd.h>
 10 #include <signal.h>
 11 #include <inttypes.h>
 12 
 13 
 14 #include <sys/prctl.h>
 15 #include <linux/prctl.h>
 16 
 17 /* Get/set the process' ability to use the timestamp counter instruction */
 18 #ifndef PR_GET_TSC
 19 #define PR_GET_TSC 25
 20 #define PR_SET_TSC 26
 21 # define PR_TSC_ENABLE          1   /* allow the use of the timestamp counter */
 22 # define PR_TSC_SIGSEGV         2   /* throw a SIGSEGV instead of reading the TSC */
 23 #endif
 24 
 25 const char *tsc_names[] =
 26 {
 27         [0] = "[not set]",
 28         [PR_TSC_ENABLE] = "PR_TSC_ENABLE",
 29         [PR_TSC_SIGSEGV] = "PR_TSC_SIGSEGV",
 30 };
 31 
 32 uint64_t rdtsc() {
 33 uint32_t lo, hi;
 34 /* We cannot use "=A", since this would use %rax on x86_64 */
 35 __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
 36 return (uint64_t)hi << 32 | lo;
 37 }
 38 
 39 void sigsegv_cb(int sig)
 40 {
 41         int tsc_val = 0;
 42 
 43         printf("[ SIG_SEGV ]\n");
 44         printf("prctl(PR_GET_TSC, &tsc_val); ");
 45         fflush(stdout);
 46 
 47         if ( prctl(PR_GET_TSC, &tsc_val) == -1)
 48                 perror("prctl");
 49 
 50         printf("tsc_val == %s\n", tsc_names[tsc_val]);
 51         printf("prctl(PR_SET_TSC, PR_TSC_ENABLE)\n");
 52         fflush(stdout);
 53         if ( prctl(PR_SET_TSC, PR_TSC_ENABLE) == -1)
 54                 perror("prctl");
 55 
 56         printf("rdtsc() == ");
 57 }
 58 
 59 int main(int argc, char **argv)
 60 {
 61         int tsc_val = 0;
 62 
 63         signal(SIGSEGV, sigsegv_cb);
 64 
 65         printf("rdtsc() == %llu\n", (unsigned long long)rdtsc());
 66         printf("prctl(PR_GET_TSC, &tsc_val); ");
 67         fflush(stdout);
 68 
 69         if ( prctl(PR_GET_TSC, &tsc_val) == -1)
 70                 perror("prctl");
 71 
 72         printf("tsc_val == %s\n", tsc_names[tsc_val]);
 73         printf("rdtsc() == %llu\n", (unsigned long long)rdtsc());
 74         printf("prctl(PR_SET_TSC, PR_TSC_ENABLE)\n");
 75         fflush(stdout);
 76 
 77         if ( prctl(PR_SET_TSC, PR_TSC_ENABLE) == -1)
 78                 perror("prctl");
 79 
 80         printf("rdtsc() == %llu\n", (unsigned long long)rdtsc());
 81         printf("prctl(PR_SET_TSC, PR_TSC_SIGSEGV)\n");
 82         fflush(stdout);
 83 
 84         if ( prctl(PR_SET_TSC, PR_TSC_SIGSEGV) == -1)
 85                 perror("prctl");
 86 
 87         printf("rdtsc() == ");
 88         fflush(stdout);
 89         printf("%llu\n", (unsigned long long)rdtsc());
 90         fflush(stdout);
 91 
 92         exit(EXIT_SUCCESS);
 93 }
 94 
 95 

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