88 lines
3.6 KiB
C
88 lines
3.6 KiB
C
/* $NetBSD: userret.h,v 1.9 2009/10/17 08:50:49 nakayama Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1996-2002 Eduardo Horvath. All rights reserved.
|
|
* Copyright (c) 1996
|
|
* The President and Fellows of Harvard College. All rights reserved.
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This software was developed by the Computer Systems Engineering group
|
|
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
|
|
* contributed to Berkeley.
|
|
*
|
|
* All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Lawrence Berkeley Laboratory.
|
|
* This product includes software developed by Harvard University.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* This product includes software developed by Harvard University.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)trap.c 8.4 (Berkeley) 9/23/93
|
|
*/
|
|
|
|
#include <sys/userret.h>
|
|
|
|
static __inline void userret(struct lwp *, int, u_quad_t);
|
|
/*
|
|
* Define the code needed before returning to user mode, for
|
|
* trap, mem_access_fault, and syscall.
|
|
*/
|
|
static __inline void
|
|
userret(struct lwp *l, int pc, u_quad_t oticks)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
|
|
mi_userret(l);
|
|
|
|
/*
|
|
* If profiling, charge recent system time to the trapped pc.
|
|
*/
|
|
if (p->p_stflag & PST_PROFIL)
|
|
addupc_task(l, pc, (int)(p->p_sticks - oticks));
|
|
}
|
|
|
|
static __inline void share_fpu(struct lwp *, struct trapframe64 *);
|
|
/*
|
|
* If someone stole the FPU while we were away, do not enable it
|
|
* on return. This is not done in userret() above as it must follow
|
|
* the ktrsysret() in syscall(). Actually, it is likely that the
|
|
* ktrsysret should occur before the call to userret.
|
|
*
|
|
* Oh, and don't touch the FPU bit if we're returning to the kernel.
|
|
*/
|
|
static __inline void
|
|
share_fpu(struct lwp *l, struct trapframe64 *tf)
|
|
{
|
|
if (!(tf->tf_tstate & TSTATE_PRIV) && fplwp != l)
|
|
tf->tf_tstate &= ~TSTATE_PEF;
|
|
}
|