1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Author: Lu Zeng <zenglu@loongson.cn>
4 * Pei Huang <huangpei@loongson.cn>
5 * Huacai Chen <chenhuacai@loongson.cn>
7 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
10 #include <asm/asmmacro.h>
11 #include <asm/asm-offsets.h>
12 #include <asm/errno.h>
13 #include <asm/export.h>
14 #include <asm/fpregdef.h>
15 #include <asm/loongarch.h>
16 #include <asm/regdef.h>
18 #define FPU_REG_WIDTH 8
19 #define LSX_REG_WIDTH 16
20 #define LASX_REG_WIDTH 32
22 .macro EX insn, reg, src, offs
23 .ex\@: \insn \reg, \src, \offs
24 .section __ex_table,"a"
29 .macro sc_save_fp base
30 EX fst.d $f0, \base, (0 * FPU_REG_WIDTH)
31 EX fst.d $f1, \base, (1 * FPU_REG_WIDTH)
32 EX fst.d $f2, \base, (2 * FPU_REG_WIDTH)
33 EX fst.d $f3, \base, (3 * FPU_REG_WIDTH)
34 EX fst.d $f4, \base, (4 * FPU_REG_WIDTH)
35 EX fst.d $f5, \base, (5 * FPU_REG_WIDTH)
36 EX fst.d $f6, \base, (6 * FPU_REG_WIDTH)
37 EX fst.d $f7, \base, (7 * FPU_REG_WIDTH)
38 EX fst.d $f8, \base, (8 * FPU_REG_WIDTH)
39 EX fst.d $f9, \base, (9 * FPU_REG_WIDTH)
40 EX fst.d $f10, \base, (10 * FPU_REG_WIDTH)
41 EX fst.d $f11, \base, (11 * FPU_REG_WIDTH)
42 EX fst.d $f12, \base, (12 * FPU_REG_WIDTH)
43 EX fst.d $f13, \base, (13 * FPU_REG_WIDTH)
44 EX fst.d $f14, \base, (14 * FPU_REG_WIDTH)
45 EX fst.d $f15, \base, (15 * FPU_REG_WIDTH)
46 EX fst.d $f16, \base, (16 * FPU_REG_WIDTH)
47 EX fst.d $f17, \base, (17 * FPU_REG_WIDTH)
48 EX fst.d $f18, \base, (18 * FPU_REG_WIDTH)
49 EX fst.d $f19, \base, (19 * FPU_REG_WIDTH)
50 EX fst.d $f20, \base, (20 * FPU_REG_WIDTH)
51 EX fst.d $f21, \base, (21 * FPU_REG_WIDTH)
52 EX fst.d $f22, \base, (22 * FPU_REG_WIDTH)
53 EX fst.d $f23, \base, (23 * FPU_REG_WIDTH)
54 EX fst.d $f24, \base, (24 * FPU_REG_WIDTH)
55 EX fst.d $f25, \base, (25 * FPU_REG_WIDTH)
56 EX fst.d $f26, \base, (26 * FPU_REG_WIDTH)
57 EX fst.d $f27, \base, (27 * FPU_REG_WIDTH)
58 EX fst.d $f28, \base, (28 * FPU_REG_WIDTH)
59 EX fst.d $f29, \base, (29 * FPU_REG_WIDTH)
60 EX fst.d $f30, \base, (30 * FPU_REG_WIDTH)
61 EX fst.d $f31, \base, (31 * FPU_REG_WIDTH)
64 .macro sc_restore_fp base
65 EX fld.d $f0, \base, (0 * FPU_REG_WIDTH)
66 EX fld.d $f1, \base, (1 * FPU_REG_WIDTH)
67 EX fld.d $f2, \base, (2 * FPU_REG_WIDTH)
68 EX fld.d $f3, \base, (3 * FPU_REG_WIDTH)
69 EX fld.d $f4, \base, (4 * FPU_REG_WIDTH)
70 EX fld.d $f5, \base, (5 * FPU_REG_WIDTH)
71 EX fld.d $f6, \base, (6 * FPU_REG_WIDTH)
72 EX fld.d $f7, \base, (7 * FPU_REG_WIDTH)
73 EX fld.d $f8, \base, (8 * FPU_REG_WIDTH)
74 EX fld.d $f9, \base, (9 * FPU_REG_WIDTH)
75 EX fld.d $f10, \base, (10 * FPU_REG_WIDTH)
76 EX fld.d $f11, \base, (11 * FPU_REG_WIDTH)
77 EX fld.d $f12, \base, (12 * FPU_REG_WIDTH)
78 EX fld.d $f13, \base, (13 * FPU_REG_WIDTH)
79 EX fld.d $f14, \base, (14 * FPU_REG_WIDTH)
80 EX fld.d $f15, \base, (15 * FPU_REG_WIDTH)
81 EX fld.d $f16, \base, (16 * FPU_REG_WIDTH)
82 EX fld.d $f17, \base, (17 * FPU_REG_WIDTH)
83 EX fld.d $f18, \base, (18 * FPU_REG_WIDTH)
84 EX fld.d $f19, \base, (19 * FPU_REG_WIDTH)
85 EX fld.d $f20, \base, (20 * FPU_REG_WIDTH)
86 EX fld.d $f21, \base, (21 * FPU_REG_WIDTH)
87 EX fld.d $f22, \base, (22 * FPU_REG_WIDTH)
88 EX fld.d $f23, \base, (23 * FPU_REG_WIDTH)
89 EX fld.d $f24, \base, (24 * FPU_REG_WIDTH)
90 EX fld.d $f25, \base, (25 * FPU_REG_WIDTH)
91 EX fld.d $f26, \base, (26 * FPU_REG_WIDTH)
92 EX fld.d $f27, \base, (27 * FPU_REG_WIDTH)
93 EX fld.d $f28, \base, (28 * FPU_REG_WIDTH)
94 EX fld.d $f29, \base, (29 * FPU_REG_WIDTH)
95 EX fld.d $f30, \base, (30 * FPU_REG_WIDTH)
96 EX fld.d $f31, \base, (31 * FPU_REG_WIDTH)
99 .macro sc_save_fcc base, tmp0, tmp1
100 movcf2gr \tmp0, $fcc0
102 movcf2gr \tmp0, $fcc1
103 bstrins.d \tmp1, \tmp0, 15, 8
104 movcf2gr \tmp0, $fcc2
105 bstrins.d \tmp1, \tmp0, 23, 16
106 movcf2gr \tmp0, $fcc3
107 bstrins.d \tmp1, \tmp0, 31, 24
108 movcf2gr \tmp0, $fcc4
109 bstrins.d \tmp1, \tmp0, 39, 32
110 movcf2gr \tmp0, $fcc5
111 bstrins.d \tmp1, \tmp0, 47, 40
112 movcf2gr \tmp0, $fcc6
113 bstrins.d \tmp1, \tmp0, 55, 48
114 movcf2gr \tmp0, $fcc7
115 bstrins.d \tmp1, \tmp0, 63, 56
116 EX st.d \tmp1, \base, 0
119 .macro sc_restore_fcc base, tmp0, tmp1
120 EX ld.d \tmp0, \base, 0
121 bstrpick.d \tmp1, \tmp0, 7, 0
122 movgr2cf $fcc0, \tmp1
123 bstrpick.d \tmp1, \tmp0, 15, 8
124 movgr2cf $fcc1, \tmp1
125 bstrpick.d \tmp1, \tmp0, 23, 16
126 movgr2cf $fcc2, \tmp1
127 bstrpick.d \tmp1, \tmp0, 31, 24
128 movgr2cf $fcc3, \tmp1
129 bstrpick.d \tmp1, \tmp0, 39, 32
130 movgr2cf $fcc4, \tmp1
131 bstrpick.d \tmp1, \tmp0, 47, 40
132 movgr2cf $fcc5, \tmp1
133 bstrpick.d \tmp1, \tmp0, 55, 48
134 movgr2cf $fcc6, \tmp1
135 bstrpick.d \tmp1, \tmp0, 63, 56
136 movgr2cf $fcc7, \tmp1
139 .macro sc_save_fcsr base, tmp0
140 movfcsr2gr \tmp0, fcsr0
141 EX st.w \tmp0, \base, 0
144 .macro sc_restore_fcsr base, tmp0
145 EX ld.w \tmp0, \base, 0
146 movgr2fcsr fcsr0, \tmp0
150 * Save a thread's fp context.
152 SYM_FUNC_START(_save_fp)
154 fpu_save_double a0 t1 # clobbers t1
155 fpu_save_cc a0 t1 t2 # clobbers t1, t2
157 SYM_FUNC_END(_save_fp)
158 EXPORT_SYMBOL(_save_fp)
161 * Restore a thread's fp context.
163 SYM_FUNC_START(_restore_fp)
164 fpu_restore_double a0 t1 # clobbers t1
165 fpu_restore_csr a0 t1
166 fpu_restore_cc a0 t1 t2 # clobbers t1, t2
168 SYM_FUNC_END(_restore_fp)
171 * Load the FPU with signalling NANS. This bit pattern we're using has
172 * the property that no matter whether considered as single or as double
173 * precision represents signaling NANS.
175 * The value to initialize fcsr0 to comes in $a0.
178 SYM_FUNC_START(_init_fpu)
179 li.w t1, CSR_EUEN_FPEN
180 csrxchg t1, t1, LOONGARCH_CSR_EUEN
220 SYM_FUNC_END(_init_fpu)
227 SYM_FUNC_START(_save_fp_context)
233 SYM_FUNC_END(_save_fp_context)
240 SYM_FUNC_START(_restore_fp_context)
242 sc_restore_fcc a1 t1 t2
243 sc_restore_fcsr a2 t1
246 SYM_FUNC_END(_restore_fp_context)
248 SYM_FUNC_START(fault)
249 li.w a0, -EFAULT # failure