pcalign-a32.c (968B)
1 /* Test PC misalignment exception */ 2 3 #ifdef __thumb__ 4 #error "This test must be compiled for ARM" 5 #endif 6 7 #include <assert.h> 8 #include <signal.h> 9 #include <stdlib.h> 10 #include <stdio.h> 11 12 static void *expected; 13 14 static void sigbus(int sig, siginfo_t *info, void *vuc) 15 { 16 assert(info->si_code == BUS_ADRALN); 17 assert(info->si_addr == expected); 18 exit(EXIT_SUCCESS); 19 } 20 21 int main() 22 { 23 void *tmp; 24 25 struct sigaction sa = { 26 .sa_sigaction = sigbus, 27 .sa_flags = SA_SIGINFO 28 }; 29 30 if (sigaction(SIGBUS, &sa, NULL) < 0) { 31 perror("sigaction"); 32 return EXIT_FAILURE; 33 } 34 35 asm volatile("adr %0, 1f + 2\n\t" 36 "str %0, %1\n\t" 37 "bx %0\n" 38 "1:" 39 : "=&r"(tmp), "=m"(expected)); 40 41 /* 42 * From v8, it is CONSTRAINED UNPREDICTABLE whether BXWritePC aligns 43 * the address or not. If so, we can legitimately fall through. 44 */ 45 return EXIT_SUCCESS; 46 }