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/* Test PC misalignment exception */
#ifdef __thumb__
#error "This test must be compiled for ARM"
#endif
#include <assert.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
static void *expected;
static void sigbus(int sig, siginfo_t *info, void *vuc)
{
assert(info->si_code == BUS_ADRALN);
assert(info->si_addr == expected);
exit(EXIT_SUCCESS);
}
int main()
{
void *tmp;
struct sigaction sa = {
.sa_sigaction = sigbus,
.sa_flags = SA_SIGINFO
};
if (sigaction(SIGBUS, &sa, NULL) < 0) {
perror("sigaction");
return EXIT_FAILURE;
}
asm volatile("adr %0, 1f + 2\n\t"
"str %0, %1\n\t"
"bx %0\n"
"1:"
: "=&r"(tmp), "=m"(expected));
/*
* From v8, it is CONSTRAINED UNPREDICTABLE whether BXWritePC aligns
* the address or not. If so, we can legitimately fall through.
*/
return EXIT_SUCCESS;
}
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