1 /* $NetBSD: userret.h,v 1.6 2004/02/13 11:36:17 wiz Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 5 * Copyright (C) 1995, 1996 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "opt_altivec.h" 35 36 #include <sys/userret.h> 37 38 #include <powerpc/fpu.h> 39 40 /* 41 * Define the code needed before returning to user mode, for 42 * trap and syscall. 43 */ 44 static __inline void 45 userret(struct lwp *l, struct trapframe *frame) 46 { 47 struct cpu_info *ci = curcpu(); 48 struct pcb *pcb; 49 50 /* Invoke MI userret code */ 51 mi_userret(l); 52 53 pcb = &l->l_addr->u_pcb; 54 55 /* 56 * If someone stole the fp or vector unit while we were away, 57 * disable it 58 */ 59 #ifdef PPC_HAVE_FPU 60 if ((pcb->pcb_flags & PCB_FPU) && 61 (l != ci->ci_fpulwp || pcb->pcb_fpcpu != ci)) { 62 frame->srr1 &= ~PSL_FP; 63 } 64 #endif 65 #ifdef ALTIVEC 66 if ((pcb->pcb_flags & PCB_ALTIVEC) && 67 (l != ci->ci_veclwp || pcb->pcb_veccpu != ci)) { 68 frame->srr1 &= ~PSL_VEC; 69 } 70 71 /* 72 * If the new process isn't the current AltiVec process on this 73 * CPU, we need to stop any data streams that are active (since 74 * it will be a different address space). 75 */ 76 if (ci->ci_veclwp != NULL && ci->ci_veclwp != l) { 77 __asm __volatile("dssall;sync"); 78 } 79 #endif 80 81 ci->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 82 } 83