1 /* $NetBSD: userret.h,v 1.4 2003/01/18 06:23:30 thorpej 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 lwp *l, 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(l)) != 0) { 51 postsig(sig); 52 } 53 54 /* Invoke per-process kernel-exit handling, if any */ 55 if (l->l_proc->p_userret) 56 (l->l_proc->p_userret)(l, l->l_proc->p_userret_arg); 57 58 /* Invoke any pending upcalls */ 59 while (l->l_flag & L_SA_UPCALL) 60 sa_upcall_userret(l); 61 62 pcb = &l->l_addr->u_pcb; 63 64 /* 65 * If someone stole the fp or vector unit while we were away, 66 * disable it 67 */ 68 #ifdef PPC_HAVE_FPU 69 if ((pcb->pcb_flags & PCB_FPU) && 70 (l != ci->ci_fpulwp || pcb->pcb_fpcpu != ci)) { 71 frame->srr1 &= ~PSL_FP; 72 } 73 #endif 74 #ifdef ALTIVEC 75 if ((pcb->pcb_flags & PCB_ALTIVEC) && 76 (l != ci->ci_veclwp || pcb->pcb_veccpu != ci)) { 77 frame->srr1 &= ~PSL_VEC; 78 } 79 80 /* 81 * If the new process isn't the current AltiVec process on this 82 * cpu, we need to stop any data streams that are active (since 83 * it will be a different address space). 84 */ 85 if (ci->ci_veclwp != NULL && ci->ci_veclwp != l) { 86 __asm __volatile("dssall;sync"); 87 } 88 #endif 89 90 ci->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 91 } 92