1 /* $NetBSD: userret.h,v 1.24 2012/05/26 00:31:07 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 #include <sys/ras.h> 39 40 #include <powerpc/fpu.h> 41 #include <powerpc/psl.h> 42 43 #ifdef PPC_BOOKE 44 #include <powerpc/spr.h> 45 #include <powerpc/booke/spr.h> 46 #endif 47 48 /* 49 * Define the code needed before returning to user mode, for 50 * trap and syscall. 51 */ 52 static __inline void 53 userret(struct lwp *l, struct trapframe *tf) 54 { 55 KASSERTMSG((tf == trapframe(curlwp)), 56 "tf=%p, trapframe(curlwp)=%p\n", tf, trapframe(curlwp)); 57 58 /* Invoke MI userret code */ 59 mi_userret(l); 60 61 KASSERTMSG((tf->tf_srr1 & PSL_PR) != 0, 62 "tf=%p: srr1 (%#lx): PSL_PR isn't set!", 63 tf, tf->tf_srr1); 64 65 tf->tf_srr1 &= PSL_USERSRR1; /* clear SRR1 status bits */ 66 67 #ifdef ALTIVEC 68 /* 69 * We need to manually restore PSL_VEC each time we return 70 * to user mode since PSL_VEC isn't always preserved in SRR1. 71 * We keep a copy of it in md_flags to make restoring easier. 72 */ 73 tf->tf_srr1 |= l->l_md.md_flags & PSL_VEC; 74 #endif 75 #ifdef PPC_BOOKE 76 /* 77 * BookE doesn't PSL_SE but it does have a debug instruction completion 78 * exception but it needs PSL_DE to fire. Since we don't want it to 79 * happen in the kernel, we must disable PSL_DE and let it get 80 * restored by rfi/rfci. 81 */ 82 if (__predict_false(tf->tf_srr1 & PSL_SE)) { 83 extern void booke_sstep(struct trapframe *); /* ugly */ 84 booke_sstep(tf); 85 } 86 #endif 87 88 #ifdef __HAVE_RAS 89 /* 90 * Check to see if a RAS was interrupted and restart it if it was. 91 */ 92 struct proc * const p = l->l_proc; 93 if (__predict_false(p->p_raslist != NULL)) { 94 void * const ras_pc = ras_lookup(p, (void *) tf->tf_srr0); 95 if (ras_pc != (void *) -1) 96 tf->tf_srr0 = (vaddr_t) ras_pc; 97 } 98 #endif 99 } 100