cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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test_r5900_multu.c (1559B)

      1/*
      2 * Test R5900-specific three-operand MULTU and MULTU1.
      3 */
      4
      5#include <stdio.h>
      6#include <inttypes.h>
      7#include <assert.h>
      8
      9static uint64_t multu(uint32_t rs, uint32_t rt)
     10{
     11    uint32_t rd, lo, hi;
     12    uint64_t r;
     13
     14    __asm__ __volatile__ (
     15            "    multu %0, %3, %4\n"
     16            "    mflo %1\n"
     17            "    mfhi %2\n"
     18            : "=r" (rd), "=r" (lo), "=r" (hi)
     19            : "r" (rs), "r" (rt));
     20    r = ((uint64_t)hi << 32) | (uint32_t)lo;
     21
     22    assert((uint64_t)rs * rt == r);
     23    assert(rd == lo);
     24
     25    return r;
     26}
     27
     28static uint64_t multu1(uint32_t rs, uint32_t rt)
     29{
     30    uint32_t rd, lo, hi;
     31    uint64_t r;
     32
     33    __asm__ __volatile__ (
     34            "    multu1 %0, %3, %4\n"
     35            "    mflo1 %1\n"
     36            "    mfhi1 %2\n"
     37            : "=r" (rd), "=r" (lo), "=r" (hi)
     38            : "r" (rs), "r" (rt));
     39    r = ((uint64_t)hi << 32) | (uint32_t)lo;
     40
     41    assert((uint64_t)rs * rt == r);
     42    assert(rd == lo);
     43
     44    return r;
     45}
     46
     47static uint64_t multu_variants(uint32_t rs, uint32_t rt)
     48{
     49    uint64_t rd  = multu(rs, rt);
     50    uint64_t rd1 = multu1(rs, rt);
     51
     52    assert(rd == rd1);
     53
     54    return rd;
     55}
     56
     57int main()
     58{
     59    assert(multu_variants(17, 19) == 323);
     60    assert(multu_variants(77773, 99991) == 7776600043);
     61    assert(multu_variants(12207031, 305175781) == 3725290219116211);
     62
     63    assert(multu_variants(0x80000000U, 0x7FFFFFFF) == 0x3FFFFFFF80000000);
     64    assert(multu_variants(0x80000000U, 0x80000000U) ==  0x4000000000000000);
     65    assert(multu_variants(0xFFFFFFFFU, 0xFFFFFFFFU) ==  0xFFFFFFFE00000001U);
     66
     67    return 0;
     68}