1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh5/fpu.c
4 *
5 * Copyright (C) 2001 Manuela Cirronis, Paolo Alberelli
6 * Copyright (C) 2002 STMicroelectronics Limited
7 * Author : Stuart Menefy
8 *
9 * Started from SH4 version:
10 * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
11 */
12 #include <linux/sched.h>
13 #include <linux/signal.h>
14 #include <asm/processor.h>
15
save_fpu(struct task_struct * tsk)16 void save_fpu(struct task_struct *tsk)
17 {
18 asm volatile("fst.p %0, (0*8), fp0\n\t"
19 "fst.p %0, (1*8), fp2\n\t"
20 "fst.p %0, (2*8), fp4\n\t"
21 "fst.p %0, (3*8), fp6\n\t"
22 "fst.p %0, (4*8), fp8\n\t"
23 "fst.p %0, (5*8), fp10\n\t"
24 "fst.p %0, (6*8), fp12\n\t"
25 "fst.p %0, (7*8), fp14\n\t"
26 "fst.p %0, (8*8), fp16\n\t"
27 "fst.p %0, (9*8), fp18\n\t"
28 "fst.p %0, (10*8), fp20\n\t"
29 "fst.p %0, (11*8), fp22\n\t"
30 "fst.p %0, (12*8), fp24\n\t"
31 "fst.p %0, (13*8), fp26\n\t"
32 "fst.p %0, (14*8), fp28\n\t"
33 "fst.p %0, (15*8), fp30\n\t"
34 "fst.p %0, (16*8), fp32\n\t"
35 "fst.p %0, (17*8), fp34\n\t"
36 "fst.p %0, (18*8), fp36\n\t"
37 "fst.p %0, (19*8), fp38\n\t"
38 "fst.p %0, (20*8), fp40\n\t"
39 "fst.p %0, (21*8), fp42\n\t"
40 "fst.p %0, (22*8), fp44\n\t"
41 "fst.p %0, (23*8), fp46\n\t"
42 "fst.p %0, (24*8), fp48\n\t"
43 "fst.p %0, (25*8), fp50\n\t"
44 "fst.p %0, (26*8), fp52\n\t"
45 "fst.p %0, (27*8), fp54\n\t"
46 "fst.p %0, (28*8), fp56\n\t"
47 "fst.p %0, (29*8), fp58\n\t"
48 "fst.p %0, (30*8), fp60\n\t"
49 "fst.p %0, (31*8), fp62\n\t"
50
51 "fgetscr fr63\n\t"
52 "fst.s %0, (32*8), fr63\n\t"
53 : /* no output */
54 : "r" (&tsk->thread.xstate->hardfpu)
55 : "memory");
56 }
57
restore_fpu(struct task_struct * tsk)58 void restore_fpu(struct task_struct *tsk)
59 {
60 asm volatile("fld.p %0, (0*8), fp0\n\t"
61 "fld.p %0, (1*8), fp2\n\t"
62 "fld.p %0, (2*8), fp4\n\t"
63 "fld.p %0, (3*8), fp6\n\t"
64 "fld.p %0, (4*8), fp8\n\t"
65 "fld.p %0, (5*8), fp10\n\t"
66 "fld.p %0, (6*8), fp12\n\t"
67 "fld.p %0, (7*8), fp14\n\t"
68 "fld.p %0, (8*8), fp16\n\t"
69 "fld.p %0, (9*8), fp18\n\t"
70 "fld.p %0, (10*8), fp20\n\t"
71 "fld.p %0, (11*8), fp22\n\t"
72 "fld.p %0, (12*8), fp24\n\t"
73 "fld.p %0, (13*8), fp26\n\t"
74 "fld.p %0, (14*8), fp28\n\t"
75 "fld.p %0, (15*8), fp30\n\t"
76 "fld.p %0, (16*8), fp32\n\t"
77 "fld.p %0, (17*8), fp34\n\t"
78 "fld.p %0, (18*8), fp36\n\t"
79 "fld.p %0, (19*8), fp38\n\t"
80 "fld.p %0, (20*8), fp40\n\t"
81 "fld.p %0, (21*8), fp42\n\t"
82 "fld.p %0, (22*8), fp44\n\t"
83 "fld.p %0, (23*8), fp46\n\t"
84 "fld.p %0, (24*8), fp48\n\t"
85 "fld.p %0, (25*8), fp50\n\t"
86 "fld.p %0, (26*8), fp52\n\t"
87 "fld.p %0, (27*8), fp54\n\t"
88 "fld.p %0, (28*8), fp56\n\t"
89 "fld.p %0, (29*8), fp58\n\t"
90 "fld.p %0, (30*8), fp60\n\t"
91
92 "fld.s %0, (32*8), fr63\n\t"
93 "fputscr fr63\n\t"
94
95 "fld.p %0, (31*8), fp62\n\t"
96 : /* no output */
97 : "r" (&tsk->thread.xstate->hardfpu)
98 : "memory");
99 }
100
do_fpu_error(unsigned long ex,struct pt_regs * regs)101 asmlinkage void do_fpu_error(unsigned long ex, struct pt_regs *regs)
102 {
103 regs->pc += 4;
104
105 force_sig(SIGFPE);
106 }
107
