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 } 43