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_mult.c (1795B)

      1/*
      2 * Test R5900-specific three-operand MULT and MULT1.
      3 */
      4
      5#include <stdio.h>
      6#include <inttypes.h>
      7#include <assert.h>
      8
      9static int64_t mult(int32_t rs, int32_t rt)
     10{
     11    int32_t rd, lo, hi;
     12    int64_t r;
     13
     14    __asm__ __volatile__ (
     15            "    mult %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 = ((int64_t)hi << 32) | (uint32_t)lo;
     21
     22    assert((int64_t)rs * rt == r);
     23    assert(rd == lo);
     24
     25    return r;
     26}
     27
     28static int64_t mult1(int32_t rs, int32_t rt)
     29{
     30    int32_t rd, lo, hi;
     31    int64_t r;
     32
     33    __asm__ __volatile__ (
     34            "    mult1 %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 = ((int64_t)hi << 32) | (uint32_t)lo;
     40
     41    assert((int64_t)rs * rt == r);
     42    assert(rd == lo);
     43
     44    return r;
     45}
     46
     47static int64_t mult_variants(int32_t rs, int32_t rt)
     48{
     49    int64_t rd  = mult(rs, rt);
     50    int64_t rd1 = mult1(rs, rt);
     51
     52    assert(rd == rd1);
     53
     54    return rd;
     55}
     56
     57static void verify_mult_negations(int32_t rs, int32_t rt, int64_t expected)
     58{
     59    assert(mult_variants(rs, rt) == expected);
     60    assert(mult_variants(-rs, rt) == -expected);
     61    assert(mult_variants(rs, -rt) == -expected);
     62    assert(mult_variants(-rs, -rt) == expected);
     63}
     64
     65int main()
     66{
     67    verify_mult_negations(17, 19, 323);
     68    verify_mult_negations(77773, 99991, 7776600043);
     69    verify_mult_negations(12207031, 305175781, 3725290219116211);
     70
     71    assert(mult_variants(-0x80000000,  0x7FFFFFFF) == -0x3FFFFFFF80000000);
     72    assert(mult_variants(-0x80000000, -0x7FFFFFFF) ==  0x3FFFFFFF80000000);
     73    assert(mult_variants(-0x80000000, -0x80000000) ==  0x4000000000000000);
     74
     75    return 0;
     76}