1/* $NetBSD: userret.h,v 1.31 2020/07/06 09:34:17 rin 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#ifdef _KERNEL_OPT 35#include "opt_altivec.h" 36#include "opt_ppcarch.h" 37#endif 38 39#include <sys/userret.h> 40#include <sys/ras.h> 41 42#include <powerpc/fpu.h> 43#include <powerpc/psl.h> 44 45#ifdef PPC_BOOKE 46#include <powerpc/spr.h> 47#include <powerpc/booke/spr.h> 48#endif 49 50/* 51 * Define the code needed before returning to user mode, for 52 * trap and syscall. 53 */ 54static __inline void 55userret(struct lwp *l, struct trapframe *tf) 56{ 57 KASSERTMSG((tf == trapframe(curlwp)), 58 "tf=%p, trapframe(curlwp)=%p\n", tf, trapframe(curlwp)); 59 60 /* Invoke MI userret code */ 61 mi_userret(l); 62 63 KASSERTMSG((tf->tf_srr1 & PSL_PR) != 0, 64 "tf=%p: srr1 (%#lx): PSL_PR isn't set!", 65 tf, tf->tf_srr1); 66 KASSERTMSG((tf->tf_srr1 & PSL_FP) == 0 67 || l->l_cpu->ci_data.cpu_pcu_curlwp[PCU_FPU] == l, 68 "tf=%p: srr1 (%#lx): PSL_FP set but FPU curlwp %p is not curlwp %p!", 69 tf, tf->tf_srr1, l->l_cpu->ci_data.cpu_pcu_curlwp[PCU_FPU], l); 70 71 /* clear SRR1 status bits */ 72 tf->tf_srr1 &= (PSL_USERSRR1|PSL_FP|PSL_VEC); 73 74#ifdef ALTIVEC 75 /* 76 * We need to manually restore PSL_VEC each time we return 77 * to user mode since PSL_VEC isn't always preserved in SRR1. 78 * We keep a copy of it in md_flags to make restoring easier. 79 */ 80 tf->tf_srr1 |= l->l_md.md_flags & PSL_VEC; 81#endif 82#ifdef PPC_BOOKE 83 /* 84 * BookE doesn't have PSL_SE but it does have a debug instruction 85 * completion exception but it needs PSL_DE to fire. Instead we 86 * use IAC1/IAC2 to match the next PC. 87 */ 88 if (__predict_false(tf->tf_srr1 & PSL_SE)) { 89 tf->tf_srr1 &= ~PSL_SE; 90 extern void booke_sstep(struct trapframe *); /* ugly */ 91 booke_sstep(tf); 92 } 93#endif 94 95#ifdef __HAVE_RAS 96 /* 97 * Check to see if a RAS was interrupted and restart it if it was. 98 */ 99 struct proc * const p = l->l_proc; 100 if (__predict_false(p->p_raslist != NULL)) { 101 void * const ras_pc = ras_lookup(p, (void *) tf->tf_srr0); 102 if (ras_pc != (void *) -1) 103 tf->tf_srr0 = (vaddr_t) ras_pc; 104 } 105#endif 106} 107