1 /* $NetBSD: userret.h,v 1.10 2004/04/16 08:52:41 hannken 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 * const ci = curcpu(); 48 #ifdef PPC_HAVE_FPU 49 struct pcb * const pcb = &l->l_addr->u_pcb; 50 #endif 51 52 /* Invoke MI userret code */ 53 mi_userret(l); 54 55 frame->srr1 &= PSL_USERSRR1; /* clear SRR1 status bits */ 56 57 /* 58 * If someone stole the fp or vector unit while we were away, 59 * disable it. Note that if the PSL FP/VEC bits aren't set, then 60 * we don't own it. 61 */ 62 #ifdef PPC_HAVE_FPU 63 if ((frame->srr1 & PSL_FP) && 64 (l != ci->ci_fpulwp || pcb->pcb_fpcpu != ci)) { 65 frame->srr1 &= ~(PSL_FP|PSL_FE0|PSL_FE1); 66 } 67 #endif 68 #ifdef ALTIVEC 69 /* 70 * We need to manually restore PSL_VEC each time we return 71 * to user mode since PSL_VEC is not preserved in SRR1. 72 */ 73 if (frame->srr1 & PSL_VEC) { 74 if (l != ci->ci_veclwp) 75 frame->srr1 &= ~PSL_VEC; 76 } else { 77 if (l == ci->ci_veclwp) 78 frame->srr1 |= PSL_VEC; 79 } 80 81 /* 82 * If the new process isn't the current AltiVec process on this 83 * CPU, we need to stop any data streams that are active (since 84 * it will be a different address space). 85 */ 86 if (ci->ci_veclwp != NULL && ci->ci_veclwp != l) { 87 __asm __volatile("dssall;sync"); 88 } 89 #endif 90 91 ci->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 92 } 93