1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* FP/SIMD state saving and restoring macros
*
* Copyright (C) 2012 ARM Ltd.
* Author: Catalin Marinas <catalin.marinas@arm.com>
*/
#include <asm/assembler.h>
.macro fpsimd_save state, tmpnr
stp q0, q1, [\state, #16 * 0]
stp q2, q3, [\state, #16 * 2]
stp q4, q5, [\state, #16 * 4]
stp q6, q7, [\state, #16 * 6]
stp q8, q9, [\state, #16 * 8]
stp q10, q11, [\state, #16 * 10]
stp q12, q13, [\state, #16 * 12]
stp q14, q15, [\state, #16 * 14]
stp q16, q17, [\state, #16 * 16]
stp q18, q19, [\state, #16 * 18]
stp q20, q21, [\state, #16 * 20]
stp q22, q23, [\state, #16 * 22]
stp q24, q25, [\state, #16 * 24]
stp q26, q27, [\state, #16 * 26]
stp q28, q29, [\state, #16 * 28]
stp q30, q31, [\state, #16 * 30]!
mrs x\tmpnr, fpsr
str w\tmpnr, [\state, #16 * 2]
mrs x\tmpnr, fpcr
str w\tmpnr, [\state, #16 * 2 + 4]
.endm
.macro fpsimd_restore_fpcr state, tmp
/*
* Writes to fpcr may be self-synchronising, so avoid restoring
* the register if it hasn't changed.
*/
mrs \tmp, fpcr
cmp \tmp, \state
b.eq 9999f
msr fpcr, \state
9999:
.endm
/* Clobbers \state */
.macro fpsimd_restore state, tmpnr
ldp q0, q1, [\state, #16 * 0]
ldp q2, q3, [\state, #16 * 2]
ldp q4, q5, [\state, #16 * 4]
ldp q6, q7, [\state, #16 * 6]
ldp q8, q9, [\state, #16 * 8]
ldp q10, q11, [\state, #16 * 10]
ldp q12, q13, [\state, #16 * 12]
ldp q14, q15, [\state, #16 * 14]
ldp q16, q17, [\state, #16 * 16]
ldp q18, q19, [\state, #16 * 18]
ldp q20, q21, [\state, #16 * 20]
ldp q22, q23, [\state, #16 * 22]
ldp q24, q25, [\state, #16 * 24]
ldp q26, q27, [\state, #16 * 26]
ldp q28, q29, [\state, #16 * 28]
ldp q30, q31, [\state, #16 * 30]!
ldr w\tmpnr, [\state, #16 * 2]
msr fpsr, x\tmpnr
ldr w\tmpnr, [\state, #16 * 2 + 4]
fpsimd_restore_fpcr x\tmpnr, \state
.endm
/* Sanity-check macros to help avoid encoding garbage instructions */
.macro _check_general_reg nr
.if (\nr) < 0 || (\nr) > 30
.error "Bad register number \nr."
.endif
.endm
.macro _sve_check_zreg znr
.if (\znr) < 0 || (\znr) > 31
.error "Bad Scalable Vector Extension vector register number \znr."
.endif
.endm
.macro _sve_check_preg pnr
.if (\pnr) < 0 || (\pnr) > 15
.error "Bad Scalable Vector Extension predicate register number \pnr."
.endif
.endm
.macro _check_num n, min, max
.if (\n) < (\min) || (\n) > (\max)
.error "Number \n out of range [\min,\max]"
.endif
.endm
/* SVE instruction encodings for non-SVE-capable assemblers */
/* STR (vector): STR Z\nz, [X\nxbase, #\offset, MUL VL] */
.macro _sve_str_v nz, nxbase, offset=0
_sve_check_zreg \nz
_check_general_reg \nxbase
_check_num (\offset), -0x100, 0xff
.inst 0xe5804000 \
| (\nz) \
| ((\nxbase) << 5) \
| (((\offset) & 7) << 10) \
| (((\offset) & 0x1f8) << 13)
.endm
/* LDR (vector): LDR Z\nz, [X\nxbase, #\offset, MUL VL] */
.macro _sve_ldr_v nz, nxbase, offset=0
_sve_check_zreg \nz
_check_general_reg \nxbase
_check_num (\offset), -0x100, 0xff
.inst 0x85804000 \
| (\nz) \
| ((\nxbase) << 5) \
| (((\offset) & 7) << 10) \
| (((\offset) & 0x1f8) << 13)
.endm
/* STR (predicate): STR P\np, [X\nxbase, #\offset, MUL VL] */
.macro _sve_str_p np, nxbase, offset=0
_sve_check_preg \np
_check_general_reg \nxbase
_check_num (\offset), -0x100, 0xff
.inst 0xe5800000 \
| (\np) \
| ((\nxbase) << 5) \
| (((\offset) & 7) << 10) \
| (((\offset) & 0x1f8) << 13)
.endm
/* LDR (predicate): LDR P\np, [X\nxbase, #\offset, MUL VL] */
.macro _sve_ldr_p np, nxbase, offset=0
_sve_check_preg \np
_check_general_reg \nxbase
_check_num (\offset), -0x100, 0xff
.inst 0x85800000 \
| (\np) \
| ((\nxbase) << 5) \
| (((\offset) & 7) << 10) \
| (((\offset) & 0x1f8) << 13)
.endm
/* RDVL X\nx, #\imm */
.macro _sve_rdvl nx, imm
_check_general_reg \nx
_check_num (\imm), -0x20, 0x1f
.inst 0x04bf5000 \
| (\nx) \
| (((\imm) & 0x3f) << 5)
.endm
/* RDFFR (unpredicated): RDFFR P\np.B */
.macro _sve_rdffr np
_sve_check_preg \np
.inst 0x2519f000 \
| (\np)
.endm
/* WRFFR P\np.B */
.macro _sve_wrffr np
_sve_check_preg \np
.inst 0x25289000 \
| ((\np) << 5)
.endm
/* PFALSE P\np.B */
.macro _sve_pfalse np
_sve_check_preg \np
.inst 0x2518e400 \
| (\np)
.endm
.macro __for from:req, to:req
.if (\from) == (\to)
_for__body %\from
.else
__for %\from, %((\from) + ((\to) - (\from)) / 2)
__for %((\from) + ((\to) - (\from)) / 2 + 1), %\to
.endif
.endm
.macro _for var:req, from:req, to:req, insn:vararg
.macro _for__body \var:req
.noaltmacro
\insn
.altmacro
.endm
.altmacro
__for \from, \to
.noaltmacro
.purgem _for__body
.endm
/* Update ZCR_EL1.LEN with the new VQ */
.macro sve_load_vq xvqminus1, xtmp, xtmp2
mrs_s \xtmp, SYS_ZCR_EL1
bic \xtmp2, \xtmp, ZCR_ELx_LEN_MASK
orr \xtmp2, \xtmp2, \xvqminus1
cmp \xtmp2, \xtmp
b.eq 921f
msr_s SYS_ZCR_EL1, \xtmp2 //self-synchronising
921:
.endm
/* Preserve the first 128-bits of Znz and zero the rest. */
.macro _sve_flush_z nz
_sve_check_zreg \nz
mov v\nz\().16b, v\nz\().16b
.endm
.macro sve_flush_z
_for n, 0, 31, _sve_flush_z \n
.endm
.macro sve_flush_p_ffr
_for n, 0, 15, _sve_pfalse \n
_sve_wrffr 0
.endm
.macro sve_save nxbase, xpfpsr, nxtmp
_for n, 0, 31, _sve_str_v \n, \nxbase, \n - 34
_for n, 0, 15, _sve_str_p \n, \nxbase, \n - 16
_sve_rdffr 0
_sve_str_p 0, \nxbase
_sve_ldr_p 0, \nxbase, -16
mrs x\nxtmp, fpsr
str w\nxtmp, [\xpfpsr]
mrs x\nxtmp, fpcr
str w\nxtmp, [\xpfpsr, #4]
.endm
.macro __sve_load nxbase, xpfpsr, nxtmp
_for n, 0, 31, _sve_ldr_v \n, \nxbase, \n - 34
_sve_ldr_p 0, \nxbase
_sve_wrffr 0
_for n, 0, 15, _sve_ldr_p \n, \nxbase, \n - 16
ldr w\nxtmp, [\xpfpsr]
msr fpsr, x\nxtmp
ldr w\nxtmp, [\xpfpsr, #4]
msr fpcr, x\nxtmp
.endm
.macro sve_load nxbase, xpfpsr, xvqminus1, nxtmp, xtmp2
sve_load_vq \xvqminus1, x\nxtmp, \xtmp2
__sve_load \nxbase, \xpfpsr, \nxtmp
.endm
|
