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

bti-1.c (1432B)

      1/*
      2 * Branch target identification, basic notskip cases.
      3 */
      4
      5#include "bti-crt.inc.c"
      6
      7static void skip2_sigill(int sig, siginfo_t *info, ucontext_t *uc)
      8{
      9    uc->uc_mcontext.pc += 8;
     10    uc->uc_mcontext.pstate = 1;
     11}
     12
     13#define NOP       "nop"
     14#define BTI_N     "hint #32"
     15#define BTI_C     "hint #34"
     16#define BTI_J     "hint #36"
     17#define BTI_JC    "hint #38"
     18
     19#define BTYPE_1(DEST) \
     20    asm("mov %0,#1; adr x16, 1f; br x16; 1: " DEST "; mov %0,#0" \
     21        : "=r"(skipped) : : "x16")
     22
     23#define BTYPE_2(DEST) \
     24    asm("mov %0,#1; adr x16, 1f; blr x16; 1: " DEST "; mov %0,#0" \
     25        : "=r"(skipped) : : "x16", "x30")
     26
     27#define BTYPE_3(DEST) \
     28    asm("mov %0,#1; adr x15, 1f; br x15; 1: " DEST "; mov %0,#0" \
     29        : "=r"(skipped) : : "x15")
     30
     31#define TEST(WHICH, DEST, EXPECT) \
     32    do { WHICH(DEST); fail += skipped ^ EXPECT; } while (0)
     33
     34
     35int main()
     36{
     37    int fail = 0;
     38    int skipped;
     39
     40    /* Signal-like with SA_SIGINFO.  */
     41    signal_info(SIGILL, skip2_sigill);
     42
     43    TEST(BTYPE_1, NOP, 1);
     44    TEST(BTYPE_1, BTI_N, 1);
     45    TEST(BTYPE_1, BTI_C, 0);
     46    TEST(BTYPE_1, BTI_J, 0);
     47    TEST(BTYPE_1, BTI_JC, 0);
     48
     49    TEST(BTYPE_2, NOP, 1);
     50    TEST(BTYPE_2, BTI_N, 1);
     51    TEST(BTYPE_2, BTI_C, 0);
     52    TEST(BTYPE_2, BTI_J, 1);
     53    TEST(BTYPE_2, BTI_JC, 0);
     54
     55    TEST(BTYPE_3, NOP, 1);
     56    TEST(BTYPE_3, BTI_N, 1);
     57    TEST(BTYPE_3, BTI_C, 1);
     58    TEST(BTYPE_3, BTI_J, 0);
     59    TEST(BTYPE_3, BTI_JC, 0);
     60
     61    return fail;
     62}