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-rw-r--r--arch/sh/kernel/cpu/sh5/fpu.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh5/fpu.c b/arch/sh/kernel/cpu/sh5/fpu.c
new file mode 100644
index 000000000000..30b76a94abf2
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh5/fpu.c
@@ -0,0 +1,166 @@
1/*
2 * arch/sh/kernel/cpu/sh5/fpu.c
3 *
4 * Copyright (C) 2001 Manuela Cirronis, Paolo Alberelli
5 * Copyright (C) 2002 STMicroelectronics Limited
6 * Author : Stuart Menefy
7 *
8 * Started from SH4 version:
9 * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15#include <linux/sched.h>
16#include <linux/signal.h>
17#include <asm/processor.h>
18#include <asm/user.h>
19#include <asm/io.h>
20
21/*
22 * Initially load the FPU with signalling NANS. This bit pattern
23 * has the property that no matter whether considered as single or as
24 * double precision, it still represents a signalling NAN.
25 */
26#define sNAN64 0xFFFFFFFFFFFFFFFFULL
27#define sNAN32 0xFFFFFFFFUL
28
29static union sh_fpu_union init_fpuregs = {
30 .hard = {
31 .fp_regs = { [0 ... 63] = sNAN32 },
32 .fpscr = FPSCR_INIT
33 }
34};
35
36void save_fpu(struct task_struct *tsk, struct pt_regs *regs)
37{
38 asm volatile("fst.p %0, (0*8), fp0\n\t"
39 "fst.p %0, (1*8), fp2\n\t"
40 "fst.p %0, (2*8), fp4\n\t"
41 "fst.p %0, (3*8), fp6\n\t"
42 "fst.p %0, (4*8), fp8\n\t"
43 "fst.p %0, (5*8), fp10\n\t"
44 "fst.p %0, (6*8), fp12\n\t"
45 "fst.p %0, (7*8), fp14\n\t"
46 "fst.p %0, (8*8), fp16\n\t"
47 "fst.p %0, (9*8), fp18\n\t"
48 "fst.p %0, (10*8), fp20\n\t"
49 "fst.p %0, (11*8), fp22\n\t"
50 "fst.p %0, (12*8), fp24\n\t"
51 "fst.p %0, (13*8), fp26\n\t"
52 "fst.p %0, (14*8), fp28\n\t"
53 "fst.p %0, (15*8), fp30\n\t"
54 "fst.p %0, (16*8), fp32\n\t"
55 "fst.p %0, (17*8), fp34\n\t"
56 "fst.p %0, (18*8), fp36\n\t"
57 "fst.p %0, (19*8), fp38\n\t"
58 "fst.p %0, (20*8), fp40\n\t"
59 "fst.p %0, (21*8), fp42\n\t"
60 "fst.p %0, (22*8), fp44\n\t"
61 "fst.p %0, (23*8), fp46\n\t"
62 "fst.p %0, (24*8), fp48\n\t"
63 "fst.p %0, (25*8), fp50\n\t"
64 "fst.p %0, (26*8), fp52\n\t"
65 "fst.p %0, (27*8), fp54\n\t"
66 "fst.p %0, (28*8), fp56\n\t"
67 "fst.p %0, (29*8), fp58\n\t"
68 "fst.p %0, (30*8), fp60\n\t"
69 "fst.p %0, (31*8), fp62\n\t"
70
71 "fgetscr fr63\n\t"
72 "fst.s %0, (32*8), fr63\n\t"
73 : /* no output */
74 : "r" (&tsk->thread.fpu.hard)
75 : "memory");
76}
77
78static inline void
79fpload(struct sh_fpu_hard_struct *fpregs)
80{
81 asm volatile("fld.p %0, (0*8), fp0\n\t"
82 "fld.p %0, (1*8), fp2\n\t"
83 "fld.p %0, (2*8), fp4\n\t"
84 "fld.p %0, (3*8), fp6\n\t"
85 "fld.p %0, (4*8), fp8\n\t"
86 "fld.p %0, (5*8), fp10\n\t"
87 "fld.p %0, (6*8), fp12\n\t"
88 "fld.p %0, (7*8), fp14\n\t"
89 "fld.p %0, (8*8), fp16\n\t"
90 "fld.p %0, (9*8), fp18\n\t"
91 "fld.p %0, (10*8), fp20\n\t"
92 "fld.p %0, (11*8), fp22\n\t"
93 "fld.p %0, (12*8), fp24\n\t"
94 "fld.p %0, (13*8), fp26\n\t"
95 "fld.p %0, (14*8), fp28\n\t"
96 "fld.p %0, (15*8), fp30\n\t"
97 "fld.p %0, (16*8), fp32\n\t"
98 "fld.p %0, (17*8), fp34\n\t"
99 "fld.p %0, (18*8), fp36\n\t"
100 "fld.p %0, (19*8), fp38\n\t"
101 "fld.p %0, (20*8), fp40\n\t"
102 "fld.p %0, (21*8), fp42\n\t"
103 "fld.p %0, (22*8), fp44\n\t"
104 "fld.p %0, (23*8), fp46\n\t"
105 "fld.p %0, (24*8), fp48\n\t"
106 "fld.p %0, (25*8), fp50\n\t"
107 "fld.p %0, (26*8), fp52\n\t"
108 "fld.p %0, (27*8), fp54\n\t"
109 "fld.p %0, (28*8), fp56\n\t"
110 "fld.p %0, (29*8), fp58\n\t"
111 "fld.p %0, (30*8), fp60\n\t"
112
113 "fld.s %0, (32*8), fr63\n\t"
114 "fputscr fr63\n\t"
115
116 "fld.p %0, (31*8), fp62\n\t"
117 : /* no output */
118 : "r" (fpregs) );
119}
120
121void fpinit(struct sh_fpu_hard_struct *fpregs)
122{
123 *fpregs = init_fpuregs.hard;
124}
125
126asmlinkage void
127do_fpu_error(unsigned long ex, struct pt_regs *regs)
128{
129 struct task_struct *tsk = current;
130
131 regs->pc += 4;
132
133 tsk->thread.trap_no = 11;
134 tsk->thread.error_code = 0;
135 force_sig(SIGFPE, tsk);
136}
137
138
139asmlinkage void
140do_fpu_state_restore(unsigned long ex, struct pt_regs *regs)
141{
142 void die(const char *str, struct pt_regs *regs, long err);
143
144 if (! user_mode(regs))
145 die("FPU used in kernel", regs, ex);
146
147 regs->sr &= ~SR_FD;
148
149 if (last_task_used_math == current)
150 return;
151
152 enable_fpu();
153 if (last_task_used_math != NULL)
154 /* Other processes fpu state, save away */
155 save_fpu(last_task_used_math, regs);
156
157 last_task_used_math = current;
158 if (used_math()) {
159 fpload(&current->thread.fpu.hard);
160 } else {
161 /* First time FPU user. */
162 fpload(&init_fpuregs.hard);
163 set_used_math();
164 }
165 disable_fpu();
166}
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