1 /* $NetBSD: userret.h,v 1.20 2011/05/02 02:01:33 matt 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_ppcarch.h" 35 #include "opt_altivec.h" 36 37 #include <sys/userret.h> 38 39 #include <powerpc/fpu.h> 40 41 #ifdef PPC_BOOKE 42 #include <powerpc/spr.h> 43 #include <powerpc/booke/spr.h> 44 #endif 45 46 /* 47 * Define the code needed before returning to user mode, for 48 * trap and syscall. 49 */ 50 static __inline void 51 userret(struct lwp *l, struct trapframe *tf) 52 { 53 KASSERTMSG((tf == trapframe(curlwp)), 54 ("tf=%p, trapframe(curlwp)=%p\n", tf, trapframe(curlwp))); 55 56 /* Invoke MI userret code */ 57 mi_userret(l); 58 59 tf->tf_srr1 &= PSL_USERSRR1; /* clear SRR1 status bits */ 60 61 #ifdef ALTIVEC 62 /* 63 * We need to manually restore PSL_VEC each time we return 64 * to user mode since PSL_VEC isn't always preserved in SRR1. 65 * We keep a copy of it in md_flags to make restoring easier. 66 */ 67 tf->tf_srr1 |= l->l_md.md_flags & PSL_VEC; 68 #endif 69 #ifdef PPC_BOOKE 70 /* 71 * BookE doesn't PSL_SE but it does have a debug instruction completion 72 * exception but it needs PSL_DE to fire. Since we don't want it to 73 * happen in the kernel, we must disable PSL_DE and let it get 74 * restored by rfi/rfci. 75 */ 76 if (__predict_false(tf->tf_srr1 & PSL_SE)) { 77 extern void booke_sstep(struct trapframe *); /* ugly */ 78 booke_sstep(tf); 79 } 80 #endif 81 } 82