/* $NetBSD: userret.h,v 1.15 2007/11/06 02:52:53 simonb Exp $ */ /* * Copyright (C) 1995, 1996 Wolfgang Solfrank. * Copyright (C) 1995, 1996 TooLs GmbH. * All rights reserved. * * 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 TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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. */ #include "opt_altivec.h" #include <sys/userret.h> #include <powerpc/fpu.h> /* * Define the code needed before returning to user mode, for * trap and syscall. */ static __inline void userret(struct lwp *l, struct trapframe *frame) { #if defined(PPC_HAVE_FPU) || defined(ALTIVEC) struct cpu_info * const ci = curcpu(); #endif #ifdef PPC_HAVE_FPU struct pcb * const pcb = &l->l_addr->u_pcb; #endif /* Invoke MI userret code */ mi_userret(l); frame->srr1 &= PSL_USERSRR1; /* clear SRR1 status bits */ /* * If someone stole the fp or vector unit while we were away, * disable it. Note that if the PSL FP/VEC bits aren't set, then * we don't own it. */ #ifdef PPC_HAVE_FPU if ((frame->srr1 & PSL_FP) && (l != ci->ci_fpulwp || pcb->pcb_fpcpu != ci)) { frame->srr1 &= ~(PSL_FP|PSL_FE0|PSL_FE1); } #endif #ifdef ALTIVEC /* * We need to manually restore PSL_VEC each time we return * to user mode since PSL_VEC is not preserved in SRR1. */ if (frame->srr1 & PSL_VEC) { if (l != ci->ci_veclwp) frame->srr1 &= ~PSL_VEC; } else { if (l == ci->ci_veclwp) frame->srr1 |= PSL_VEC; } /* * If the new process isn't the current AltiVec process on this * CPU, we need to stop any data streams that are active (since * it will be a different address space). */ if (ci->ci_veclwp != NULL && ci->ci_veclwp != l) { __asm volatile("dssall;sync"); } #endif }