cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

test-div.c (1271B)

      1#include <assert.h>
      2#include <limits.h>
      3
      4struct TestS {
      5    long x, y, q, r;
      6};
      7
      8static struct TestS test_s[] = {
      9    { 4, 2, 2, 0 },                 /* normal cases */
     10    { 9, 7, 1, 2 },
     11    { 0, 0, -1, 0 },                /* div by zero cases */
     12    { 9, 0, -1, 9 },
     13    { LONG_MIN, -1, LONG_MIN, 0 },  /* overflow case */
     14};
     15
     16struct TestU {
     17    unsigned long x, y, q, r;
     18};
     19
     20static struct TestU test_u[] = {
     21    { 4, 2, 2, 0 },                 /* normal cases */
     22    { 9, 7, 1, 2 },
     23    { 0, 0, ULONG_MAX, 0 },         /* div by zero cases */
     24    { 9, 0, ULONG_MAX, 9 },
     25};
     26
     27#define ARRAY_SIZE(X)  (sizeof(X) / sizeof(*(X)))
     28
     29int main (void)
     30{
     31    int i;
     32
     33    for (i = 0; i < ARRAY_SIZE(test_s); i++) {
     34        long q, r;
     35
     36        asm("div %0, %2, %3\n\t"
     37            "rem %1, %2, %3"
     38            : "=&r" (q), "=r" (r)
     39            : "r" (test_s[i].x), "r" (test_s[i].y));
     40
     41        assert(q == test_s[i].q);
     42        assert(r == test_s[i].r);
     43    }
     44
     45    for (i = 0; i < ARRAY_SIZE(test_u); i++) {
     46        unsigned long q, r;
     47
     48        asm("divu %0, %2, %3\n\t"
     49            "remu %1, %2, %3"
     50            : "=&r" (q), "=r" (r)
     51            : "r" (test_u[i].x), "r" (test_u[i].y));
     52
     53        assert(q == test_u[i].q);
     54        assert(r == test_u[i].r);
     55    }
     56
     57    return 0;
     58}