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1da177e4 LT |
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 | */ | |
1da177e4 LT |
22 | #include <linux/sched.h> |
23 | #include <asm/processor.h> | |
24 | #include <asm/signal.h> | |
25 | #include <asm/uaccess.h> | |
26 | ||
f028b860 | 27 | #include <asm/fpu.h> |
1da177e4 LT |
28 | #include <asm/fpu_emulator.h> |
29 | ||
1da177e4 LT |
30 | #define SIGNALLING_NAN 0x7ff800007ff80000LL |
31 | ||
32 | void 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 | ||
eae89076 | 42 | current->thread.fpu.fcr31 = 0; |
1da177e4 | 43 | for (i = 0; i < 32; i++) { |
eae89076 | 44 | current->thread.fpu.fpr[i] = SIGNALLING_NAN; |
1da177e4 LT |
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 | ||
53dc8028 | 55 | int fpu_emulator_save_context(struct sigcontext __user *sc) |
1da177e4 LT |
56 | { |
57 | int i; | |
58 | int err = 0; | |
59 | ||
60 | for (i = 0; i < 32; i++) { | |
61 | err |= | |
eae89076 | 62 | __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 63 | } |
eae89076 | 64 | err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
65 | |
66 | return err; | |
67 | } | |
68 | ||
53dc8028 | 69 | int fpu_emulator_restore_context(struct sigcontext __user *sc) |
1da177e4 LT |
70 | { |
71 | int i; | |
72 | int err = 0; | |
73 | ||
74 | for (i = 0; i < 32; i++) { | |
75 | err |= | |
eae89076 | 76 | __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 77 | } |
eae89076 | 78 | err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
79 | |
80 | return err; | |
81 | } | |
82 | ||
875d43e7 | 83 | #ifdef CONFIG_64BIT |
1da177e4 LT |
84 | /* |
85 | * This is the o32 version | |
86 | */ | |
87 | ||
53dc8028 | 88 | int fpu_emulator_save_context32(struct sigcontext32 __user *sc) |
1da177e4 LT |
89 | { |
90 | int i; | |
91 | int err = 0; | |
92 | ||
93 | for (i = 0; i < 32; i+=2) { | |
94 | err |= | |
eae89076 | 95 | __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 96 | } |
eae89076 | 97 | err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
98 | |
99 | return err; | |
100 | } | |
101 | ||
53dc8028 | 102 | int fpu_emulator_restore_context32(struct sigcontext32 __user *sc) |
1da177e4 LT |
103 | { |
104 | int i; | |
105 | int err = 0; | |
106 | ||
107 | for (i = 0; i < 32; i+=2) { | |
108 | err |= | |
eae89076 | 109 | __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]); |
1da177e4 | 110 | } |
eae89076 | 111 | err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); |
1da177e4 LT |
112 | |
113 | return err; | |
114 | } | |
115 | #endif |