stack_put
if (stack_put(st, state->registers[PC]) == -1)
if (stack_put(st, frame->pc) == -1)
if (stack_put(st, callpc) == -1)
if (stack_put(st, frame->pc) == -1)
int stack_put(struct stack *, vm_offset_t);
if (stack_put(st, callpc) == -1)