qemu

FORK: QEMU emulator
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bti-3.c (951B)

      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 }