Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
4 *
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17 *
18 * Routines corresponding to Linux kernel FP context
19 * manipulation primitives for the Algorithmics MIPS
20 * FPU Emulator
21 */
22#include <linux/sched.h>
23#include <asm/processor.h>
24#include <asm/signal.h>
25#include <asm/uaccess.h>
26
27#include <asm/fpu_emulator.h>
28
29#define SIGNALLING_NAN 0x7ff800007ff80000LL
30
31void fpu_emulator_init_fpu(void)
32{
33 static int first = 1;
34 int i;
35
36 if (first) {
37 first = 0;
38 printk("Algorithmics/MIPS FPU Emulator v1.5\n");
39 }
40
41 current->thread.fpu.fcr31 = 0;
42 for (i = 0; i < 32; i++) {
43 current->thread.fpu.fpr[i] = SIGNALLING_NAN;
44 }
45}
46
47
48/*
49 * Emulator context save/restore to/from a signal context
50 * presumed to be on the user stack, and therefore accessed
51 * with appropriate macros from uaccess.h
52 */
53
54int fpu_emulator_save_context(struct sigcontext __user *sc)
55{
56 int i;
57 int err = 0;
58
59 for (i = 0; i < 32; i++) {
60 err |=
61 __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
62 }
63 err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
64
65 return err;
66}
67
68int fpu_emulator_restore_context(struct sigcontext __user *sc)
69{
70 int i;
71 int err = 0;
72
73 for (i = 0; i < 32; i++) {
74 err |=
75 __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
76 }
77 err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
78
79 return err;
80}
81
82#ifdef CONFIG_64BIT
83/*
84 * This is the o32 version
85 */
86
87int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
88{
89 int i;
90 int err = 0;
91
92 for (i = 0; i < 32; i+=2) {
93 err |=
94 __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
95 }
96 err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
97
98 return err;
99}
100
101int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
102{
103 int i;
104 int err = 0;
105
106 for (i = 0; i < 32; i+=2) {
107 err |=
108 __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
109 }
110 err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
111
112 return err;
113}
114#endif