93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/* $NetBSD: userret.h,v 1.13 2006/02/16 20:17:14 perry Exp $ */
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/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opt_altivec.h"
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#include <sys/userret.h>
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#include <powerpc/fpu.h>
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/*
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* Define the code needed before returning to user mode, for
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* trap and syscall.
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*/
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static __inline void
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userret(struct lwp *l, struct trapframe *frame)
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{
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struct cpu_info * const ci = curcpu();
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#ifdef PPC_HAVE_FPU
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struct pcb * const pcb = &l->l_addr->u_pcb;
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#endif
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/* Invoke MI userret code */
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mi_userret(l);
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frame->srr1 &= PSL_USERSRR1; /* clear SRR1 status bits */
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/*
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* If someone stole the fp or vector unit while we were away,
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* disable it. Note that if the PSL FP/VEC bits aren't set, then
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* we don't own it.
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*/
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#ifdef PPC_HAVE_FPU
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if ((frame->srr1 & PSL_FP) &&
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(l != ci->ci_fpulwp || pcb->pcb_fpcpu != ci)) {
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frame->srr1 &= ~(PSL_FP|PSL_FE0|PSL_FE1);
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}
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#endif
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#ifdef ALTIVEC
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/*
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* We need to manually restore PSL_VEC each time we return
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* to user mode since PSL_VEC is not preserved in SRR1.
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*/
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if (frame->srr1 & PSL_VEC) {
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if (l != ci->ci_veclwp)
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frame->srr1 &= ~PSL_VEC;
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} else {
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if (l == ci->ci_veclwp)
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frame->srr1 |= PSL_VEC;
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}
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/*
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* If the new process isn't the current AltiVec process on this
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* CPU, we need to stop any data streams that are active (since
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* it will be a different address space).
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*/
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if (ci->ci_veclwp != NULL && ci->ci_veclwp != l) {
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__asm volatile("dssall;sync");
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}
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#endif
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ci->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri;
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}
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