/*
* 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;
}
