XXX AVX procfs

*** 182,191 ****
--- 182,193 ----
  {
          ucontext_t uc;
          ucontext_t *ucp;
          klwp_t *lwp = ttolwp(curthread);
          stack_t dummy_stk;
+         caddr_t xregs = NULL;
+         int xregs_size = 0;
  
          /*
           * In future releases, when the ucontext structure grows,
           * getcontext should be modified to only return the fields
           * specified in the uc_flags.  That way, the structure can grow
*** 226,240 ****
--- 228,254 ----
                      copyin(&ucp->uc_mcontext.fpregs, &uc.uc_mcontext.fpregs,
                      sizeof (uc.uc_mcontext.fpregs))) {
                          return (set_errno(EFAULT));
                  }
  
+                 /*
+                  * Get extra register state.
+                  */
+                 xregs_clrptr(lwp, &uc);
+ 
                  restorecontext(&uc);
  
                  if ((uc.uc_flags & UC_STACK) && (lwp->lwp_ustack != 0))
                          (void) copyout(&uc.uc_stack, (stack_t *)lwp->lwp_ustack,
                              sizeof (uc.uc_stack));
+ 
+                 /*
+                  * Free extra register state.
+                  */
+                 if (xregs_size)
+                         kmem_free(xregs, xregs_size);
+ 
                  return (0);
  
          case GETUSTACK:
                  if (copyout(&lwp->lwp_ustack, arg, sizeof (caddr_t)))
                          return (set_errno(EFAULT));