102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
/* $NetBSD: userret.h,v 1.8 2007/11/05 20:37:48 ad Exp $ */
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/*
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* Copyright (c) 1996
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* The President and Fellows of Harvard College. All rights reserved.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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* This product includes software developed by Harvard University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* This product includes software developed by Harvard University.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)trap.c 8.4 (Berkeley) 9/23/93
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*/
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#include <sys/userret.h>
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static __inline void userret(struct lwp *, int, u_quad_t);
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static __inline void share_fpu(struct lwp *, struct trapframe *);
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/*
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* Define the code needed before returning to user mode, for
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* trap, mem_access_fault, and syscall.
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*/
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static __inline void
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userret(struct lwp *l, int pc, u_quad_t oticks)
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{
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struct proc *p = l->l_proc;
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again:
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mi_userret(l);
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if (cpuinfo.ci_want_ast) {
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cpuinfo.ci_want_ast = 0;
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if (l->l_pflag & LP_OWEUPC) {
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l->l_pflag &= ~LP_OWEUPC;
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ADDUPROF(l);
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}
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}
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if (cpuinfo.ci_want_resched) {
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/*
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* We are being preempted.
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*/
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preempt();
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goto again;
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}
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/*
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* If profiling, charge recent system time to the trapped pc.
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*/
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if (p->p_stflag & PST_PROFIL)
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addupc_task(l, pc, (int)(p->p_sticks - oticks));
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}
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/*
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* If someone stole the FPU while we were away, do not enable it
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* on return. This is not done in userret() above as it must follow
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* the ktrsysret() in syscall(). Actually, it is likely that the
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* ktrsysret should occur before the call to userret.
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*/
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static __inline void share_fpu(struct lwp *l, struct trapframe *tf)
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{
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if ((tf->tf_psr & PSR_EF) != 0 && cpuinfo.fplwp != l)
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tf->tf_psr &= ~PSR_EF;
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}
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