userret.h revision 1.22.8.2 1 /* $NetBSD: userret.h,v 1.22.8.2 2015/11/15 16:36:57 bouyer 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 /* clear SRR1 status bits */
62 tf->tf_srr1 &= (PSL_USERSRR1|PSL_FP|PSL_VEC);
63
64 #ifdef ALTIVEC
65 /*
66 * We need to manually restore PSL_VEC each time we return
67 * to user mode since PSL_VEC isn't always preserved in SRR1.
68 * We keep a copy of it in md_flags to make restoring easier.
69 */
70 tf->tf_srr1 |= l->l_md.md_flags & PSL_VEC;
71 #endif
72 #ifdef PPC_BOOKE
73 /*
74 * BookE doesn't PSL_SE but it does have a debug instruction completion
75 * exception but it needs PSL_DE to fire. Since we don't want it to
76 * happen in the kernel, we must disable PSL_DE and let it get
77 * restored by rfi/rfci.
78 */
79 if (__predict_false(tf->tf_srr1 & PSL_SE)) {
80 extern void booke_sstep(struct trapframe *); /* ugly */
81 booke_sstep(tf);
82 }
83 #endif
84
85 #ifdef __HAVE_RAS
86 /*
87 * Check to see if a RAS was interrupted and restart it if it was.
88 */
89 struct proc * const p = l->l_proc;
90 if (__predict_false(p->p_raslist != NULL)) {
91 void * const ras_pc = ras_lookup(p, (void *) tf->tf_srr0);
92 if (ras_pc != (void *) -1)
93 tf->tf_srr0 = (vaddr_t) ras_pc;
94 }
95 #endif
96 }
97