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review.evervolv.com / android_kernel_htc_msm8960 / 0bd5d2e9ec8cc04a0225c590d35dd097e6b3a3f6 / . / arch / mips / math-emu / kernel_linkage.c
blob: 03d9a55600042282e530ab85023bf271618432d0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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/config.h>
23#include <linux/sched.h>
24#include <asm/processor.h>
25#include <asm/signal.h>
26#include <asm/uaccess.h>
27
28#include <asm/fpu_emulator.h>
29
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]30#define SIGNALLING_NAN 0x7ff800007ff80000LL
31
32void fpu_emulator_init_fpu(void)
33{
34 static int first = 1;
35 int i;
36
37 if (first) {
38 first = 0;
39 printk("Algorithmics/MIPS FPU Emulator v1.5\n");
40 }
41
42 current->thread.fpu.soft.fcr31 = 0;
43 for (i = 0; i < 32; i++) {
44 current->thread.fpu.soft.fpr[i] = SIGNALLING_NAN;
45 }
46}
47
48
49/*
50 * Emulator context save/restore to/from a signal context
51 * presumed to be on the user stack, and therefore accessed
52 * with appropriate macros from uaccess.h
53 */
54
55int fpu_emulator_save_context(struct sigcontext *sc)
56{
57 int i;
58 int err = 0;
59
60 for (i = 0; i < 32; i++) {
61 err |=
62 __put_user(current->thread.fpu.soft.fpr[i],
63 &sc->sc_fpregs[i]);
64 }
65 err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
66 err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
67
68 return err;
69}
70
71int fpu_emulator_restore_context(struct sigcontext *sc)
72{
73 int i;
74 int err = 0;
75
76 for (i = 0; i < 32; i++) {
77 err |=
78 __get_user(current->thread.fpu.soft.fpr[i],
79 &sc->sc_fpregs[i]);
80 }
81 err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
82 err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
83
84 return err;
85}
86
Ralf Baechle875d43e2005-09-03 15:56:16 -0700[diff] [blame]87#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]88/*
89 * This is the o32 version
90 */
91
92int fpu_emulator_save_context32(struct sigcontext32 *sc)
93{
94 int i;
95 int err = 0;
96
97 for (i = 0; i < 32; i+=2) {
98 err |=
99 __put_user(current->thread.fpu.soft.fpr[i],
100 &sc->sc_fpregs[i]);
101 }
102 err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
103 err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
104
105 return err;
106}
107
108int fpu_emulator_restore_context32(struct sigcontext32 *sc)
109{
110 int i;
111 int err = 0;
112
113 for (i = 0; i < 32; i+=2) {
114 err |=
115 __get_user(current->thread.fpu.soft.fpr[i],
116 &sc->sc_fpregs[i]);
117 }
118 err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
119 err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
120
121 return err;
122}
123#endif