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userret.h revision 1.20
      1  1.20     matt /*	$NetBSD: userret.h,v 1.20 2011/05/02 02:01:33 matt Exp $	*/
      2   1.1      chs 
      3   1.1      chs /*
      4   1.1      chs  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
      5   1.1      chs  * Copyright (C) 1995, 1996 TooLs GmbH.
      6   1.1      chs  * All rights reserved.
      7   1.1      chs  *
      8   1.1      chs  * Redistribution and use in source and binary forms, with or without
      9   1.1      chs  * modification, are permitted provided that the following conditions
     10   1.1      chs  * are met:
     11   1.1      chs  * 1. Redistributions of source code must retain the above copyright
     12   1.1      chs  *    notice, this list of conditions and the following disclaimer.
     13   1.1      chs  * 2. Redistributions in binary form must reproduce the above copyright
     14   1.1      chs  *    notice, this list of conditions and the following disclaimer in the
     15   1.1      chs  *    documentation and/or other materials provided with the distribution.
     16   1.1      chs  * 3. All advertising materials mentioning features or use of this software
     17   1.1      chs  *    must display the following acknowledgement:
     18   1.1      chs  *	This product includes software developed by TooLs GmbH.
     19   1.1      chs  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     20   1.1      chs  *    derived from this software without specific prior written permission.
     21   1.1      chs  *
     22   1.1      chs  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     23   1.1      chs  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24   1.1      chs  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25   1.1      chs  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     26   1.1      chs  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     27   1.1      chs  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     28   1.1      chs  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29   1.1      chs  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     30   1.1      chs  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     31   1.1      chs  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32   1.1      chs  */
     33   1.1      chs 
     34  1.18     matt #include "opt_ppcarch.h"
     35   1.3      chs #include "opt_altivec.h"
     36   1.3      chs 
     37   1.5       cl #include <sys/userret.h>
     38   1.5       cl 
     39   1.3      chs #include <powerpc/fpu.h>
     40   1.3      chs 
     41  1.18     matt #ifdef PPC_BOOKE
     42  1.18     matt #include <powerpc/spr.h>
     43  1.18     matt #include <powerpc/booke/spr.h>
     44  1.18     matt #endif
     45  1.18     matt 
     46   1.1      chs /*
     47   1.1      chs  * Define the code needed before returning to user mode, for
     48   1.1      chs  * trap and syscall.
     49   1.1      chs  */
     50  1.13    perry static __inline void
     51  1.17     matt userret(struct lwp *l, struct trapframe *tf)
     52   1.1      chs {
     53  1.17     matt 	KASSERTMSG((tf == trapframe(curlwp)),
     54  1.20     matt 	   ("tf=%p, trapframe(curlwp)=%p\n", tf, trapframe(curlwp)));
     55   1.1      chs 
     56   1.5       cl 	/* Invoke MI userret code */
     57   1.5       cl 	mi_userret(l);
     58   1.4  thorpej 
     59  1.17     matt 	tf->tf_srr1 &= PSL_USERSRR1;	/* clear SRR1 status bits */
     60   1.1      chs 
     61   1.1      chs #ifdef ALTIVEC
     62   1.9     matt 	/*
     63   1.9     matt 	 * We need to manually restore PSL_VEC each time we return
     64  1.20     matt 	 * to user mode since PSL_VEC isn't always preserved in SRR1.
     65  1.20     matt 	 * We keep a copy of it in md_flags to make restoring easier.
     66   1.9     matt 	 */
     67  1.20     matt 	tf->tf_srr1 |= l->l_md.md_flags & PSL_VEC;
     68   1.1      chs #endif
     69  1.18     matt #ifdef PPC_BOOKE
     70  1.18     matt 	/*
     71  1.18     matt 	 * BookE doesn't PSL_SE but it does have a debug instruction completion
     72  1.18     matt 	 * exception but it needs PSL_DE to fire.  Since we don't want it to
     73  1.18     matt 	 * happen in the kernel, we must disable PSL_DE and let it get
     74  1.18     matt 	 * restored by rfi/rfci.
     75  1.18     matt 	 */
     76  1.18     matt 	if (__predict_false(tf->tf_srr1 & PSL_SE)) {
     77  1.18     matt 		extern void booke_sstep(struct trapframe *); /* ugly */
     78  1.18     matt 		booke_sstep(tf);
     79  1.18     matt 	}
     80  1.18     matt #endif
     81   1.1      chs }
     82