LXR qemu/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
   8int 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}
  46