sys/arch/sparc64/include/userret.h

   1 /*      $NetBSD: userret.h,v 1.8 2008/06/30 14:12:20 nakayama Exp $ */
   2
   3 /*
   4  * Copyright (c) 1996-2002 Eduardo Horvath.  All rights reserved.
   5  * Copyright (c) 1996
   6  *      The President and Fellows of Harvard College. All rights reserved.
   7  * Copyright (c) 1992, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * This software was developed by the Computer Systems Engineering group
  11  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  12  * contributed to Berkeley.
  13  *
  14  * All advertising materials mentioning features or use of this software
  15  * must display the following acknowledgement:
  16  *      This product includes software developed by the University of
  17  *      California, Lawrence Berkeley Laboratory.
  18  *      This product includes software developed by Harvard University.
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  * 1. Redistributions of source code must retain the above copyright
  24  *    notice, this list of conditions and the following disclaimer.
  25  * 2. Redistributions in binary form must reproduce the above copyright
  26  *    notice, this list of conditions and the following disclaimer in the
  27  *    documentation and/or other materials provided with the distribution.
  28  * 3. All advertising materials mentioning features or use of this software
  29  *    must display the following acknowledgement:
  30  *      This product includes software developed by the University of
  31  *      California, Berkeley and its contributors.
  32  *      This product includes software developed by Harvard University.
  33  * 4. Neither the name of the University nor the names of its contributors
  34  *    may be used to endorse or promote products derived from this software
  35  *    without specific prior written permission.
  36  *
  37  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  38  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  39  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  40  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  41  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  42  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  43  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  45  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  46  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  47  * SUCH DAMAGE.
  48  *
  49  *      @(#)trap.c      8.4 (Berkeley) 9/23/93
  50  */
  51
  52 #include <sys/userret.h>
  53
  54 static __inline void userret(struct lwp *, int,  u_quad_t);
  55 /*
  56  * Define the code needed before returning to user mode, for
  57  * trap, mem_access_fault, and syscall.
  58  */
  59 static __inline void
  60 userret(struct lwp *l, int pc, u_quad_t oticks)
  61 {
  62         struct proc *p = l->l_proc;
  63
  64         mi_userret(l);
  65
  66         /*
  67          * If profiling, charge recent system time to the trapped pc.
  68          */
  69         if (p->p_stflag & PST_PROFIL)
  70                 addupc_task(l, pc, (int)(p->p_sticks - oticks));
  71 }
  72
  73 static __inline void share_fpu(struct lwp *, struct trapframe64 *);
  74 /*
  75  * If someone stole the FPU while we were away, do not enable it
  76  * on return.  This is not done in userret() above as it must follow
  77  * the ktrsysret() in syscall().  Actually, it is likely that the
  78  * ktrsysret should occur before the call to userret.
  79  *
  80  * Oh, and don't touch the FPU bit if we're returning to the kernel.
  81  */
  82 static __inline void
  83 share_fpu(struct lwp *l, struct trapframe64 *tf)
  84 {
  85         if (!(tf->tf_tstate & TSTATE_PRIV) && fplwp != l)
  86                 tf->tf_tstate &= ~TSTATE_PEF;
  87 }