| 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 | } |