100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/* $NetBSD: userret.h,v 1.28 2014/03/10 00:04:04 matt 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_ppcarch.h"
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#include "opt_altivec.h"
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#include <sys/userret.h>
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#include <sys/ras.h>
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#include <powerpc/fpu.h>
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#include <powerpc/psl.h>
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#ifdef PPC_BOOKE
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#include <powerpc/spr.h>
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#include <powerpc/booke/spr.h>
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#endif
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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 *tf)
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{
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KASSERTMSG((tf == trapframe(curlwp)),
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"tf=%p, trapframe(curlwp)=%p\n", tf, trapframe(curlwp));
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/* Invoke MI userret code */
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mi_userret(l);
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KASSERTMSG((tf->tf_srr1 & PSL_PR) != 0,
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"tf=%p: srr1 (%#lx): PSL_PR isn't set!",
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tf, tf->tf_srr1);
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tf->tf_srr1 &= PSL_USERSRR1; /* clear SRR1 status bits */
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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 isn't always preserved in SRR1.
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* We keep a copy of it in md_flags to make restoring easier.
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*/
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tf->tf_srr1 |= l->l_md.md_flags & PSL_VEC;
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#endif
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#ifdef PPC_BOOKE
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/*
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* BookE doesn't have PSL_SE but it does have a debug instruction
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* completion exception but it needs PSL_DE to fire. Instead we
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* use IAC1/IAC2 to match the next PC.
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*/
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if (__predict_false(tf->tf_srr1 & PSL_SE)) {
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tf->tf_srr1 &= ~PSL_SE;
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extern void booke_sstep(struct trapframe *); /* ugly */
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booke_sstep(tf);
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}
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#endif
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#ifdef __HAVE_RAS
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/*
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* Check to see if a RAS was interrupted and restart it if it was.
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*/
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struct proc * const p = l->l_proc;
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if (__predict_false(p->p_raslist != NULL)) {
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void * const ras_pc = ras_lookup(p, (void *) tf->tf_srr0);
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if (ras_pc != (void *) -1)
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tf->tf_srr0 = (vaddr_t) ras_pc;
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}
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#endif
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}
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