tests/tcg/aarch64/bti-3.c

   1 /*
   2  * BTI vs PACIASP
   3  */
   4
   5 #include "bti-crt.inc.c"
   6
   7 static 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 BTYPE_1() \
  14     asm("mov %0,#1; adr x16, 1f; br x16; 1: hint #25; mov %0,#0" \
  15         : "=r"(skipped) : : "x16", "x30")
  16
  17 #define BTYPE_2() \
  18     asm("mov %0,#1; adr x16, 1f; blr x16; 1: hint #25; mov %0,#0" \
  19         : "=r"(skipped) : : "x16", "x30")
  20
  21 #define BTYPE_3() \
  22     asm("mov %0,#1; adr x15, 1f; br x15; 1: hint #25; mov %0,#0" \
  23         : "=r"(skipped) : : "x15", "x30")
  24
  25 #define TEST(WHICH, EXPECT) \
  26     do { WHICH(); fail += skipped ^ EXPECT; } while (0)
  27
  28 int main()
  29 {
  30     int fail = 0;
  31     int skipped;
  32
  33     /* Signal-like with SA_SIGINFO.  */
  34     signal_info(SIGILL, skip2_sigill);
  35
  36     /* With SCTLR_EL1.BT0 set, PACIASP is not compatible with type=3. */
  37     TEST(BTYPE_1, 0);
  38     TEST(BTYPE_2, 0);
  39     TEST(BTYPE_3, 1);
  40
  41     return fail;
  42 }