+ restore_registers(pid, ¤t->thread.regs.regs);
+ break;
+ case ARCH_GET_FS:
+ case ARCH_GET_GS:
+ /*
+ * With these two, we read to a local pointer and
+ * put_user it to the userspace pointer that we were
+ * given. If addr isn't valid (because it hasn't been
+ * faulted in or is just bogus), we want put_user to
+ * fault it in (or return -EFAULT) instead of having
+ * the host return -EFAULT.
+ */
+ ptr = &tmp;
+ }
+
+ ret = os_arch_prctl(pid, code, ptr);
+ if(ret)
+ return ret;
+
+ switch(code){
+ case ARCH_SET_FS:
+ case ARCH_SET_GS:
+ save_registers(pid, ¤t->thread.regs.regs);