summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/powerpc/alignment/alignment_handler.c
blob: 0453c50c949cb4575f050b3142891c2c61deb159 (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
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Test the powerpc alignment handler on POWER8/POWER9
 *
 * Copyright (C) 2017 IBM Corporation (Michael Neuling, Andrew Donnellan)
 */

/*
 * This selftest exercises the powerpc alignment fault handler.
 *
 * We create two sets of source and destination buffers, one in regular memory,
 * the other cache-inhibited (we use /dev/fb0 for this).
 *
 * We initialise the source buffers, then use whichever set of load/store
 * instructions is under test to copy bytes from the source buffers to the
 * destination buffers. For the regular buffers, these instructions will
 * execute normally. For the cache-inhibited buffers, these instructions
 * will trap and cause an alignment fault, and the alignment fault handler
 * will emulate the particular instruction under test. We then compare the
 * destination buffers to ensure that the native and emulated cases give the
 * same result.
 *
 * TODO:
 *   - Any FIXMEs below
 *   - Test VSX regs < 32 and > 32
 *   - Test all loads and stores
 *   - Check update forms do update register
 *   - Test alignment faults over page boundary
 *
 * Some old binutils may not support all the instructions.
 */


#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <getopt.h>
#include <setjmp.h>
#include <signal.h>

#include <asm/cputable.h>

#include "utils.h"

int bufsize;
int debug;
int testing;
volatile int gotsig;

void sighandler(int sig, siginfo_t *info, void *ctx)
{
	ucontext_t *ucp = ctx;

	if (!testing) {
		signal(sig, SIG_DFL);
		kill(0, sig);
	}
	gotsig = sig;
#ifdef __powerpc64__
	ucp->uc_mcontext.gp_regs[PT_NIP] += 4;
#else
	ucp->uc_mcontext.uc_regs->gregs[PT_NIP] += 4;
#endif
}

#define XFORM(reg, n)  " " #reg " ,%"#n",%2 ;"
#define DFORM(reg, n)  " " #reg " ,0(%"#n") ;"

#define TEST(name, ld_op, st_op, form, ld_reg, st_reg)		\
	void test_##name(char *s, char *d)			\
	{							\
		asm volatile(					\
			#ld_op form(ld_reg, 0)			\
			#st_op form(st_reg, 1)			\
			:: "r"(s), "r"(d), "r"(0)		\
			: "memory", "vs0", "vs32", "r31");	\
	}							\
	rc |= do_test(#name, test_##name)

#define LOAD_VSX_XFORM_TEST(op) TEST(op, op, stxvd2x, XFORM, 32, 32)
#define STORE_VSX_XFORM_TEST(op) TEST(op, lxvd2x, op, XFORM, 32, 32)
#define LOAD_VSX_DFORM_TEST(op) TEST(op, op, stxv, DFORM, 32, 32)
#define STORE_VSX_DFORM_TEST(op) TEST(op, lxv, op, DFORM, 32, 32)
#define LOAD_VMX_XFORM_TEST(op) TEST(op, op, stxvd2x, XFORM, 0, 32)
#define STORE_VMX_XFORM_TEST(op) TEST(op, lxvd2x, op, XFORM, 32, 0)
#define LOAD_VMX_DFORM_TEST(op) TEST(op, op, stxv, DFORM, 0, 32)
#define STORE_VMX_DFORM_TEST(op) TEST(op, lxv, op, DFORM, 32, 0)

#define LOAD_XFORM_TEST(op) TEST(op, op, stdx, XFORM, 31, 31)
#define STORE_XFORM_TEST(op) TEST(op, ldx, op, XFORM, 31, 31)
#define LOAD_DFORM_TEST(op) TEST(op, op, std, DFORM, 31, 31)
#define STORE_DFORM_TEST(op) TEST(op, ld, op, DFORM, 31, 31)

#define LOAD_FLOAT_DFORM_TEST(op)  TEST(op, op, stfd, DFORM, 0, 0)
#define STORE_FLOAT_DFORM_TEST(op) TEST(op, lfd, op, DFORM, 0, 0)
#define LOAD_FLOAT_XFORM_TEST(op)  TEST(op, op, stfdx, XFORM, 0, 0)
#define STORE_FLOAT_XFORM_TEST(op) TEST(op, lfdx, op, XFORM, 0, 0)


/* FIXME: Unimplemented tests: */
// STORE_DFORM_TEST(stq)   /* FIXME: need two registers for quad */
// STORE_DFORM_TEST(stswi) /* FIXME: string instruction */

// STORE_XFORM_TEST(stwat) /* AMO can't emulate or run on CI */
// STORE_XFORM_TEST(stdat) /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */


/* preload byte by byte */
void preload_data(void *dst, int offset, int width)
{
	char *c = dst;
	int i;

	c += offset;

	for (i = 0 ; i < width ; i++)
		c[i] = i;
}

int test_memcpy(void *dst, void *src, int size, int offset,
		void (*test_func)(char *, char *))
{
	char *s, *d;

	s = src;
	s += offset;
	d = dst;
	d += offset;

	assert(size == 16);
	gotsig = 0;
	testing = 1;

	test_func(s, d); /* run the actual test */

	testing = 0;
	if (gotsig) {
		if (debug)
			printf("  Got signal %i\n", gotsig);
		return 1;
	}
	return 0;
}

void dumpdata(char *s1, char *s2, int n, char *test_name)
{
	int i;

	printf("  %s: unexpected result:\n", test_name);
	printf("    mem:");
	for (i = 0; i < n; i++)
		printf(" %02x", s1[i]);
	printf("\n");
	printf("    ci: ");
	for (i = 0; i < n; i++)
		printf(" %02x", s2[i]);
	printf("\n");
}

int test_memcmp(void *s1, void *s2, int n, int offset, char *test_name)
{
	char *s1c, *s2c;

	s1c = s1;
	s1c += offset;
	s2c = s2;
	s2c += offset;

	if (memcmp(s1c, s2c, n)) {
		if (debug) {
			printf("\n  Compare failed. Offset:%i length:%i\n",
			       offset, n);
			dumpdata(s1c, s2c, n, test_name);
		}
		return 1;
	}
	return 0;
}

/*
 * Do two memcpy tests using the same instructions. One cachable
 * memory and the other doesn't.
 */
int do_test(char *test_name, void (*test_func)(char *, char *))
{
	int offset, width, fd, rc, r;
	void *mem0, *mem1, *ci0, *ci1;

	printf("\tDoing %s:\t", test_name);

	fd = open("/dev/fb0", O_RDWR);
	if (fd < 0) {
		printf("\n");
		perror("Can't open /dev/fb0 now?");
		return 1;
	}

	ci0 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,
		   fd, 0x0);
	ci1 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,
		   fd, bufsize);
	if ((ci0 == MAP_FAILED) || (ci1 == MAP_FAILED)) {
		printf("\n");
		perror("mmap failed");
		SKIP_IF(1);
	}

	rc = posix_memalign(&mem0, bufsize, bufsize);
	if (rc) {
		printf("\n");
		return rc;
	}

	rc = posix_memalign(&mem1, bufsize, bufsize);
	if (rc) {
		printf("\n");
		free(mem0);
		return rc;
	}

	rc = 0;
	/* offset = 0 no alignment fault, so skip */
	for (offset = 1; offset < 16; offset++) {
		width = 16; /* vsx == 16 bytes */
		r = 0;

		/* load pattern into memory byte by byte */
		preload_data(ci0, offset, width);
		preload_data(mem0, offset, width); // FIXME: remove??
		memcpy(ci0, mem0, bufsize);
		memcpy(ci1, mem1, bufsize); /* initialise output to the same */

		/* sanity check */
		test_memcmp(mem0, ci0, width, offset, test_name);

		r |= test_memcpy(ci1,  ci0,  width, offset, test_func);
		r |= test_memcpy(mem1, mem0, width, offset, test_func);
		if (r && !debug) {
			printf("FAILED: Got signal");
			rc = 1;
			break;
		}

		r |= test_memcmp(mem1, ci1, width, offset, test_name);
		if (r && !debug) {
			printf("FAILED: Wrong Data");
			rc = 1;
			break;
		}
	}

	if (rc == 0)
		printf("PASSED");

	printf("\n");

	munmap(ci0, bufsize);
	munmap(ci1, bufsize);
	free(mem0);
	free(mem1);
	close(fd);

	return rc;
}

static bool can_open_fb0(void)
{
	int fd;

	fd = open("/dev/fb0", O_RDWR);
	if (fd < 0)
		return false;

	close(fd);
	return true;
}

int test_alignment_handler_vsx_206(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());
	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));

	printf("VSX: 2.06B\n");
	LOAD_VSX_XFORM_TEST(lxvd2x);
	LOAD_VSX_XFORM_TEST(lxvw4x);
	LOAD_VSX_XFORM_TEST(lxsdx);
	LOAD_VSX_XFORM_TEST(lxvdsx);
	STORE_VSX_XFORM_TEST(stxvd2x);
	STORE_VSX_XFORM_TEST(stxvw4x);
	STORE_VSX_XFORM_TEST(stxsdx);
	return rc;
}

int test_alignment_handler_vsx_207(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());
	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));

	printf("VSX: 2.07B\n");
	LOAD_VSX_XFORM_TEST(lxsspx);
	LOAD_VSX_XFORM_TEST(lxsiwax);
	LOAD_VSX_XFORM_TEST(lxsiwzx);
	STORE_VSX_XFORM_TEST(stxsspx);
	STORE_VSX_XFORM_TEST(stxsiwx);
	return rc;
}

int test_alignment_handler_vsx_300(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());

	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00));
	printf("VSX: 3.00B\n");
	LOAD_VMX_DFORM_TEST(lxsd);
	LOAD_VSX_XFORM_TEST(lxsibzx);
	LOAD_VSX_XFORM_TEST(lxsihzx);
	LOAD_VMX_DFORM_TEST(lxssp);
	LOAD_VSX_DFORM_TEST(lxv);
	LOAD_VSX_XFORM_TEST(lxvb16x);
	LOAD_VSX_XFORM_TEST(lxvh8x);
	LOAD_VSX_XFORM_TEST(lxvx);
	LOAD_VSX_XFORM_TEST(lxvwsx);
	LOAD_VSX_XFORM_TEST(lxvl);
	LOAD_VSX_XFORM_TEST(lxvll);
	STORE_VMX_DFORM_TEST(stxsd);
	STORE_VSX_XFORM_TEST(stxsibx);
	STORE_VSX_XFORM_TEST(stxsihx);
	STORE_VMX_DFORM_TEST(stxssp);
	STORE_VSX_DFORM_TEST(stxv);
	STORE_VSX_XFORM_TEST(stxvb16x);
	STORE_VSX_XFORM_TEST(stxvh8x);
	STORE_VSX_XFORM_TEST(stxvx);
	STORE_VSX_XFORM_TEST(stxvl);
	STORE_VSX_XFORM_TEST(stxvll);
	return rc;
}

int test_alignment_handler_integer(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());

	printf("Integer\n");
	LOAD_DFORM_TEST(lbz);
	LOAD_DFORM_TEST(lbzu);
	LOAD_XFORM_TEST(lbzx);
	LOAD_XFORM_TEST(lbzux);
	LOAD_DFORM_TEST(lhz);
	LOAD_DFORM_TEST(lhzu);
	LOAD_XFORM_TEST(lhzx);
	LOAD_XFORM_TEST(lhzux);
	LOAD_DFORM_TEST(lha);
	LOAD_DFORM_TEST(lhau);
	LOAD_XFORM_TEST(lhax);
	LOAD_XFORM_TEST(lhaux);
	LOAD_XFORM_TEST(lhbrx);
	LOAD_DFORM_TEST(lwz);
	LOAD_DFORM_TEST(lwzu);
	LOAD_XFORM_TEST(lwzx);
	LOAD_XFORM_TEST(lwzux);
	LOAD_DFORM_TEST(lwa);
	LOAD_XFORM_TEST(lwax);
	LOAD_XFORM_TEST(lwaux);
	LOAD_XFORM_TEST(lwbrx);
	LOAD_DFORM_TEST(ld);
	LOAD_DFORM_TEST(ldu);
	LOAD_XFORM_TEST(ldx);
	LOAD_XFORM_TEST(ldux);
	LOAD_DFORM_TEST(lmw);
	STORE_DFORM_TEST(stb);
	STORE_XFORM_TEST(stbx);
	STORE_DFORM_TEST(stbu);
	STORE_XFORM_TEST(stbux);
	STORE_DFORM_TEST(sth);
	STORE_XFORM_TEST(sthx);
	STORE_DFORM_TEST(sthu);
	STORE_XFORM_TEST(sthux);
	STORE_XFORM_TEST(sthbrx);
	STORE_DFORM_TEST(stw);
	STORE_XFORM_TEST(stwx);
	STORE_DFORM_TEST(stwu);
	STORE_XFORM_TEST(stwux);
	STORE_XFORM_TEST(stwbrx);
	STORE_DFORM_TEST(std);
	STORE_XFORM_TEST(stdx);
	STORE_DFORM_TEST(stdu);
	STORE_XFORM_TEST(stdux);
	STORE_DFORM_TEST(stmw);

	return rc;
}

int test_alignment_handler_integer_206(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());
	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));

	printf("Integer: 2.06\n");

	LOAD_XFORM_TEST(ldbrx);
	STORE_XFORM_TEST(stdbrx);

	return rc;
}

int test_alignment_handler_vmx(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());
	SKIP_IF(!have_hwcap(PPC_FEATURE_HAS_ALTIVEC));

	printf("VMX\n");
	LOAD_VMX_XFORM_TEST(lvx);

	/*
	 * FIXME: These loads only load part of the register, so our
	 * testing method doesn't work. Also they don't take alignment
	 * faults, so it's kinda pointless anyway
	 *
	 LOAD_VMX_XFORM_TEST(lvebx)
	 LOAD_VMX_XFORM_TEST(lvehx)
	 LOAD_VMX_XFORM_TEST(lvewx)
	 LOAD_VMX_XFORM_TEST(lvxl)
	*/
	STORE_VMX_XFORM_TEST(stvx);
	STORE_VMX_XFORM_TEST(stvebx);
	STORE_VMX_XFORM_TEST(stvehx);
	STORE_VMX_XFORM_TEST(stvewx);
	STORE_VMX_XFORM_TEST(stvxl);
	return rc;
}

int test_alignment_handler_fp(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());

	printf("Floating point\n");
	LOAD_FLOAT_DFORM_TEST(lfd);
	LOAD_FLOAT_XFORM_TEST(lfdx);
	LOAD_FLOAT_DFORM_TEST(lfdu);
	LOAD_FLOAT_XFORM_TEST(lfdux);
	LOAD_FLOAT_DFORM_TEST(lfs);
	LOAD_FLOAT_XFORM_TEST(lfsx);
	LOAD_FLOAT_DFORM_TEST(lfsu);
	LOAD_FLOAT_XFORM_TEST(lfsux);
	STORE_FLOAT_DFORM_TEST(stfd);
	STORE_FLOAT_XFORM_TEST(stfdx);
	STORE_FLOAT_DFORM_TEST(stfdu);
	STORE_FLOAT_XFORM_TEST(stfdux);
	STORE_FLOAT_DFORM_TEST(stfs);
	STORE_FLOAT_XFORM_TEST(stfsx);
	STORE_FLOAT_DFORM_TEST(stfsu);
	STORE_FLOAT_XFORM_TEST(stfsux);
	STORE_FLOAT_XFORM_TEST(stfiwx);

	return rc;
}

int test_alignment_handler_fp_205(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());
	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_05));

	printf("Floating point: 2.05\n");

	LOAD_FLOAT_DFORM_TEST(lfdp);
	LOAD_FLOAT_XFORM_TEST(lfdpx);
	LOAD_FLOAT_XFORM_TEST(lfiwax);
	STORE_FLOAT_DFORM_TEST(stfdp);
	STORE_FLOAT_XFORM_TEST(stfdpx);

	return rc;
}

int test_alignment_handler_fp_206(void)
{
	int rc = 0;

	SKIP_IF(!can_open_fb0());
	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));

	printf("Floating point: 2.06\n");

	LOAD_FLOAT_XFORM_TEST(lfiwzx);

	return rc;
}

void usage(char *prog)
{
	printf("Usage: %s [options]\n", prog);
	printf("  -d	Enable debug error output\n");
	printf("\n");
	printf("This test requires a POWER8 or POWER9 CPU and a usable ");
	printf("framebuffer at /dev/fb0.\n");
}

int main(int argc, char *argv[])
{

	struct sigaction sa;
	int rc = 0;
	int option = 0;

	while ((option = getopt(argc, argv, "d")) != -1) {
		switch (option) {
		case 'd':
			debug++;
			break;
		default:
			usage(argv[0]);
			exit(1);
		}
	}

	bufsize = getpagesize();

	sa.sa_sigaction = sighandler;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_SIGINFO;
	if (sigaction(SIGSEGV, &sa, NULL) == -1
	    || sigaction(SIGBUS, &sa, NULL) == -1
	    || sigaction(SIGILL, &sa, NULL) == -1) {
		perror("sigaction");
		exit(1);
	}

	rc |= test_harness(test_alignment_handler_vsx_206,
			   "test_alignment_handler_vsx_206");
	rc |= test_harness(test_alignment_handler_vsx_207,
			   "test_alignment_handler_vsx_207");
	rc |= test_harness(test_alignment_handler_vsx_300,
			   "test_alignment_handler_vsx_300");
	rc |= test_harness(test_alignment_handler_integer,
			   "test_alignment_handler_integer");
	rc |= test_harness(test_alignment_handler_integer_206,
			   "test_alignment_handler_integer_206");
	rc |= test_harness(test_alignment_handler_vmx,
			   "test_alignment_handler_vmx");
	rc |= test_harness(test_alignment_handler_fp,
			   "test_alignment_handler_fp");
	rc |= test_harness(test_alignment_handler_fp_205,
			   "test_alignment_handler_fp_205");
	rc |= test_harness(test_alignment_handler_fp_206,
			   "test_alignment_handler_fp_206");
	return rc;
}