tests/tcg/aarch64/pauth-4.c

   1 #include <stdint.h>
   2 #include <assert.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5
   6 #define TESTS 1000
   7
   8 int main()
   9 {
  10     int i, count = 0;
  11     float perc;
  12     void *base = malloc(TESTS);
  13
  14     for (i = 0; i < TESTS; i++) {
  15         uintptr_t in, x, y;
  16
  17         in = i + (uintptr_t) base;
  18
  19         asm("mov %0, %[in]\n\t"
  20             "pacia %0, sp\n\t"        /* sigill if pauth not supported */
  21             "eor %0, %0, #4\n\t"      /* corrupt single bit */
  22             "mov %1, %0\n\t"
  23             "autia %1, sp\n\t"        /* validate corrupted pointer */
  24             "xpaci %0\n\t"            /* strip pac from corrupted pointer */
  25             : /* out */ "=r"(x), "=r"(y)
  26             : /* in */ [in] "r" (in)
  27             : /* clobbers */);
  28
  29         /*
  30          * Once stripped, the corrupted pointer is of the form 0x0000...wxyz.
  31          * We expect the autia to indicate failure, producing a pointer of the
  32          * form 0x000e....wxyz.  Use xpaci and != for the test, rather than
  33          * extracting explicit bits from the top, because the location of the
  34          * error code "e" depends on the configuration of virtual memory.
  35          */
  36         if (x != y) {
  37             count++;
  38         }
  39
  40     }
  41     perc = (float) count / (float) TESTS;
  42     printf("Checks Passed: %0.2f%%", perc * 100.0);
  43     assert(perc > 0.95);
  44     return 0;
  45 }