summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/arm64/fp/fpsimd-test.S
blob: 1c5556bdd11d16e599677f661a6997cdd7f27538 (plain)
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
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2015-2019 ARM Limited.
// Original author: Dave Martin <Dave.Martin@arm.com>
//
// Simple FPSIMD context switch test
// Repeatedly writes unique test patterns into each FPSIMD register
// and reads them back to verify integrity.
//
// for x in `seq 1 NR_CPUS`; do fpsimd-test & pids=$pids\ $! ; done
// (leave it running for as long as you want...)
// kill $pids

#include <asm/unistd.h>
#include "assembler.h"
#include "asm-offsets.h"

#define NVR	32
#define MAXVL_B	(128 / 8)

.macro _vldr Vn:req, Xt:req
	ld1	{v\Vn\().2d}, [x\Xt]
.endm

.macro _vstr Vn:req, Xt:req
	st1	{v\Vn\().2d}, [x\Xt]
.endm

// Generate accessor functions to read/write programmatically selected
// FPSIMD registers.
// x0 is the register index to access
// x1 is the memory address to read from (getv,setp) or store to (setv,setp)
// All clobber x0-x2
define_accessor setv, NVR, _vldr
define_accessor getv, NVR, _vstr

// Print a single character x0 to stdout
// Clobbers x0-x2,x8
function putc
	str	x0, [sp, #-16]!

	mov	x0, #1			// STDOUT_FILENO
	mov	x1, sp
	mov	x2, #1
	mov	x8, #__NR_write
	svc	#0

	add	sp, sp, #16
	ret
endfunction

// Print a NUL-terminated string starting at address x0 to stdout
// Clobbers x0-x3,x8
function puts
	mov	x1, x0

	mov	x2, #0
0:	ldrb	w3, [x0], #1
	cbz	w3, 1f
	add	x2, x2, #1
	b	0b

1:	mov	w0, #1			// STDOUT_FILENO
	mov	x8, #__NR_write
	svc	#0

	ret
endfunction

// Utility macro to print a literal string
// Clobbers x0-x4,x8
.macro puts string
	.pushsection .rodata.str1.1, "aMS", 1
.L__puts_literal\@: .string "\string"
	.popsection

	ldr	x0, =.L__puts_literal\@
	bl	puts
.endm

// Print an unsigned decimal number x0 to stdout
// Clobbers x0-x4,x8
function putdec
	mov	x1, sp
	str	x30, [sp, #-32]!	// Result can't be > 20 digits

	mov	x2, #0
	strb	w2, [x1, #-1]!		// Write the NUL terminator

	mov	x2, #10
0:	udiv	x3, x0, x2		// div-mod loop to generate the digits
	msub	x0, x3, x2, x0
	add	w0, w0, #'0'
	strb	w0, [x1, #-1]!
	mov	x0, x3
	cbnz	x3, 0b

	ldrb	w0, [x1]
	cbnz	w0, 1f
	mov	w0, #'0'		// Print "0" for 0, not ""
	strb	w0, [x1, #-1]!

1:	mov	x0, x1
	bl	puts

	ldr	x30, [sp], #32
	ret
endfunction

// Print an unsigned decimal number x0 to stdout, followed by a newline
// Clobbers x0-x5,x8
function putdecn
	mov	x5, x30

	bl	putdec
	mov	x0, #'\n'
	bl	putc

	ret	x5
endfunction


// Clobbers x0-x3,x8
function puthexb
	str	x30, [sp, #-0x10]!

	mov	w3, w0
	lsr	w0, w0, #4
	bl	puthexnibble
	mov	w0, w3

	ldr	x30, [sp], #0x10
	// fall through to puthexnibble
endfunction
// Clobbers x0-x2,x8
function puthexnibble
	and	w0, w0, #0xf
	cmp	w0, #10
	blo	1f
	add	w0, w0, #'a' - ('9' + 1)
1:	add	w0, w0, #'0'
	b	putc
endfunction

// x0=data in, x1=size in, clobbers x0-x5,x8
function dumphex
	str	x30, [sp, #-0x10]!

	mov	x4, x0
	mov	x5, x1

0:	subs	x5, x5, #1
	b.lo	1f
	ldrb	w0, [x4], #1
	bl	puthexb
	b	0b

1:	ldr	x30, [sp], #0x10
	ret
endfunction

// Declare some storate space to shadow the SVE register contents:
.pushsection .text
.data
.align 4
vref:
	.space	MAXVL_B * NVR
scratch:
	.space	MAXVL_B
.popsection

// Trivial memory copy: copy x2 bytes, starting at address x1, to address x0.
// Clobbers x0-x3
function memcpy
	cmp	x2, #0
	b.eq	1f
0:	ldrb	w3, [x1], #1
	strb	w3, [x0], #1
	subs	x2, x2, #1
	b.ne	0b
1:	ret
endfunction

// Generate a test pattern for storage in SVE registers
// x0: pid	(16 bits)
// x1: register number (6 bits)
// x2: generation (4 bits)
function pattern
	orr	w1, w0, w1, lsl #16
	orr	w2, w1, w2, lsl #28

	ldr	x0, =scratch
	mov	w1, #MAXVL_B / 4

0:	str	w2, [x0], #4
	add	w2, w2, #(1 << 22)
	subs	w1, w1, #1
	bne	0b

	ret
endfunction

// Get the address of shadow data for FPSIMD V-register V<xn>
.macro _adrv xd, xn, nrtmp
	ldr	\xd, =vref
	mov	x\nrtmp, #16
	madd	\xd, x\nrtmp, \xn, \xd
.endm

// Set up test pattern in a FPSIMD V-register
// x0: pid
// x1: register number
// x2: generation
function setup_vreg
	mov	x4, x30

	mov	x6, x1
	bl	pattern
	_adrv	x0, x6, 2
	mov	x5, x0
	ldr	x1, =scratch
	bl	memcpy

	mov	x0, x6
	mov	x1, x5
	bl	setv

	ret	x4
endfunction

// Fill x1 bytes starting at x0 with 0xae (for canary purposes)
// Clobbers x1, x2.
function memfill_ae
	mov	w2, #0xae
	b	memfill
endfunction

// Fill x1 bytes starting at x0 with 0.
// Clobbers x1, x2.
function memclr
	mov	w2, #0
endfunction
	// fall through to memfill

// Trivial memory fill: fill x1 bytes starting at address x0 with byte w2
// Clobbers x1
function memfill
	cmp	x1, #0
	b.eq	1f

0:	strb	w2, [x0], #1
	subs	x1, x1, #1
	b.ne	0b

1:	ret
endfunction

// Trivial memory compare: compare x2 bytes starting at address x0 with
// bytes starting at address x1.
// Returns only if all bytes match; otherwise, the program is aborted.
// Clobbers x0-x5.
function memcmp
	cbz	x2, 1f

	mov	x5, #0
0:	ldrb	w3, [x0, x5]
	ldrb	w4, [x1, x5]
	add	x5, x5, #1
	cmp	w3, w4
	b.ne	barf
	subs	x2, x2, #1
	b.ne	0b

1:	ret
endfunction

// Verify that a FPSIMD V-register matches its shadow in memory, else abort
// x0: reg number
// Clobbers x0-x5.
function check_vreg
	mov	x3, x30

	_adrv	x5, x0, 6
	mov	x4, x0
	ldr	x7, =scratch

	mov	x0, x7
	mov	x1, x6
	bl	memfill_ae

	mov	x0, x4
	mov	x1, x7
	bl	getv

	mov	x0, x5
	mov	x1, x7
	mov	x2, x6
	mov	x30, x3
	b	memcmp
endfunction

// Any SVE register modified here can cause corruption in the main
// thread -- but *only* the registers modified here.
function irritator_handler
	// Increment the irritation signal count (x23):
	ldr	x0, [x2, #ucontext_regs + 8 * 23]
	add	x0, x0, #1
	str	x0, [x2, #ucontext_regs + 8 * 23]

	// Corrupt some random V-regs
	adr	x0, .text + (irritator_handler - .text) / 16 * 16
	movi	v0.8b, #7
	movi	v9.16b, #9
	movi	v31.8b, #31

	ret
endfunction

function terminate_handler
	mov	w21, w0
	mov	x20, x2

	puts	"Terminated by signal "
	mov	w0, w21
	bl	putdec
	puts	", no error, iterations="
	ldr	x0, [x20, #ucontext_regs + 8 * 22]
	bl	putdec
	puts	", signals="
	ldr	x0, [x20, #ucontext_regs + 8 * 23]
	bl	putdecn

	mov	x0, #0
	mov	x8, #__NR_exit
	svc	#0
endfunction

// w0: signal number
// x1: sa_action
// w2: sa_flags
// Clobbers x0-x6,x8
function setsignal
	str	x30, [sp, #-((sa_sz + 15) / 16 * 16 + 16)]!

	mov	w4, w0
	mov	x5, x1
	mov	w6, w2

	add	x0, sp, #16
	mov	x1, #sa_sz
	bl	memclr

	mov	w0, w4
	add	x1, sp, #16
	str	w6, [x1, #sa_flags]
	str	x5, [x1, #sa_handler]
	mov	x2, #0
	mov	x3, #sa_mask_sz
	mov	x8, #__NR_rt_sigaction
	svc	#0

	cbz	w0, 1f

	puts	"sigaction failure\n"
	b	.Labort

1:	ldr	x30, [sp], #((sa_sz + 15) / 16 * 16 + 16)
	ret
endfunction

// Main program entry point
.globl _start
function _start
_start:
	// Sanity-check and report the vector length

	mov	x19, #128
	cmp	x19, #128
	b.lo	1f
	cmp	x19, #2048
	b.hi	1f
	tst	x19, #(8 - 1)
	b.eq	2f

1:	puts	"Bad vector length: "
	mov	x0, x19
	bl	putdecn
	b	.Labort

2:	puts	"Vector length:\t"
	mov	x0, x19
	bl	putdec
	puts	" bits\n"

	// Obtain our PID, to ensure test pattern uniqueness between processes

	mov	x8, #__NR_getpid
	svc	#0
	mov	x20, x0

	puts	"PID:\t"
	mov	x0, x20
	bl	putdecn

	mov	x23, #0		// Irritation signal count

	mov	w0, #SIGINT
	adr	x1, terminate_handler
	mov	w2, #SA_SIGINFO
	bl	setsignal

	mov	w0, #SIGTERM
	adr	x1, terminate_handler
	mov	w2, #SA_SIGINFO
	bl	setsignal

	mov	w0, #SIGUSR1
	adr	x1, irritator_handler
	mov	w2, #SA_SIGINFO
	orr	w2, w2, #SA_NODEFER
	bl	setsignal

	mov	x22, #0		// generation number, increments per iteration
.Ltest_loop:

	mov	x21, #0		// Set up V-regs & shadow with test pattern
0:	mov	x0, x20
	mov	x1, x21
	and	x2, x22, #0xf
	bl	setup_vreg
	add	x21, x21, #1
	cmp	x21, #NVR
	b.lo	0b

// Can't do this when SVE state is volatile across SVC:
	mov	x8, #__NR_sched_yield	// Encourage preemption
	svc	#0

	mov	x21, #0
0:	mov	x0, x21
	bl	check_vreg
	add	x21, x21, #1
	cmp	x21, #NVR
	b.lo	0b

	add	x22, x22, #1
	b	.Ltest_loop

.Labort:
	mov	x0, #0
	mov	x1, #SIGABRT
	mov	x8, #__NR_kill
	svc	#0
endfunction

function barf
	mov	x10, x0	// expected data
	mov	x11, x1	// actual data
	mov	x12, x2	// data size

	puts	"Mistatch: PID="
	mov	x0, x20
	bl	putdec
	puts	", iteration="
	mov	x0, x22
	bl	putdec
	puts	", reg="
	mov	x0, x21
	bl	putdecn
	puts	"\tExpected ["
	mov	x0, x10
	mov	x1, x12
	bl	dumphex
	puts	"]\n\tGot      ["
	mov	x0, x11
	mov	x1, x12
	bl	dumphex
	puts	"]\n"

	mov	x8, #__NR_exit
	mov	x1, #1
	svc	#0
endfunction