int32_t NaClSysExceptionHandler(struct NaClAppThread *natp,
uint32_t handler_addr,
uint32_t old_handler) {
struct NaClApp *nap = natp->nap;
int32_t rv = -NACL_ABI_EINVAL;
if (!nap->enable_exception_handling) {
rv = -NACL_ABI_ENOSYS;
goto no_lock_exit;
}
if (!NaClIsValidJumpTarget(nap, handler_addr)) {
rv = -NACL_ABI_EFAULT;
goto no_lock_exit;
}
NaClXMutexLock(&nap->exception_mu);
/*
* This needs to be done while holding the lock so that we don't
* start two Windows debug exception handlers.
*/
if (handler_addr != 0) {
if (!NaClDebugExceptionHandlerEnsureAttached(nap)) {
rv = -NACL_ABI_ENOSYS;
goto unlock_exit;
}
}
if (0 != old_handler &&
!NaClCopyOutToUser(nap, (uintptr_t) old_handler,
&nap->exception_handler,
sizeof nap->exception_handler)) {
rv = -NACL_ABI_EFAULT;
goto unlock_exit;
}
nap->exception_handler = handler_addr;
rv = 0;
unlock_exit:
NaClXMutexUnlock(&nap->exception_mu);
no_lock_exit:
return rv;
}
int NaClFaultedThreadQueueEnable(struct NaClApp *nap) {
nap->enable_faulted_thread_queue = 1;
return NaClDebugExceptionHandlerEnsureAttached(nap);
}
