1 /* $NetBSD: userret.h,v 1.3 2002/08/08 01:27:35 chs 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 <powerpc/fpu.h> 37 38 /* 39 * Define the code needed before returning to user mode, for 40 * trap and syscall. 41 */ 42 static __inline void 43 userret(struct proc *p, struct trapframe *frame) 44 { 45 struct cpu_info *ci = curcpu(); 46 struct pcb *pcb; 47 int sig; 48 49 /* Take pending signals. */ 50 while ((sig = CURSIG(p)) != 0) { 51 postsig(sig); 52 } 53 54 pcb = &p->p_addr->u_pcb; 55 56 /* 57 * If someone stole the fp or vector unit while we were away, 58 * disable it 59 */ 60 #ifdef PPC_HAVE_FPU 61 if ((pcb->pcb_flags & PCB_FPU) && 62 (p != ci->ci_fpuproc || pcb->pcb_fpcpu != ci)) { 63 frame->srr1 &= ~PSL_FP; 64 } 65 #endif 66 #ifdef ALTIVEC 67 if ((pcb->pcb_flags & PCB_ALTIVEC) && 68 (p != ci->ci_vecproc || pcb->pcb_veccpu != ci)) { 69 frame->srr1 &= ~PSL_VEC; 70 } 71 72 /* 73 * If the new process isn't the current AltiVec process on this 74 * cpu, we need to stop any data streams that are active (since 75 * it will be a different address space). 76 */ 77 if (ci->ci_vecproc != NULL && ci->ci_vecproc != p) { 78 __asm __volatile("dssall;sync"); 79 } 80 #endif 81 82 ci->ci_schedstate.spc_curpriority = p->p_priority = p->p_usrpri; 83 } 84