1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2014 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/assembler.inline.hpp"
28 #include "asm/macroAssembler.inline.hpp"
29 #include "compiler/disassembler.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "runtime/java.hpp"
32 #include "runtime/stubCodeGenerator.hpp"
33 #include "utilities/defaultStream.hpp"
34 #include "vm_version_ppc.hpp"
35 #ifdef TARGET_OS_FAMILY_aix
36 # include "os_aix.inline.hpp"
37 #endif
38 #ifdef TARGET_OS_FAMILY_linux
39 # include "os_linux.inline.hpp"
40 #endif
41
42 # include <sys/sysinfo.h>
43
44 int VM_Version::_features = VM_Version::unknown_m;
45 int VM_Version::_measured_cache_line_size = 128; // default value
46 const char* VM_Version::_features_str = "";
47 bool VM_Version::_is_determine_features_test_running = false;
48
49
50 #define MSG(flag) \
51 if (flag && !FLAG_IS_DEFAULT(flag)) \
52 jio_fprintf(defaultStream::error_stream(), \
53 "warning: -XX:+" #flag " requires -XX:+UseSIGTRAP\n" \
54 " -XX:+" #flag " will be disabled!\n");
55
56 void VM_Version::initialize() {
57
58 // Test which instructions are supported and measure cache line size.
59 determine_features();
60
61 // If PowerArchitecturePPC64 hasn't been specified explicitly determine from features.
62 if (FLAG_IS_DEFAULT(PowerArchitecturePPC64)) {
63 if (VM_Version::has_popcntw()) {
64 FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 7);
65 } else if (VM_Version::has_cmpb()) {
66 FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 6);
67 } else if (VM_Version::has_popcntb()) {
68 FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 5);
69 } else {
70 FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 0);
71 }
72 }
73 guarantee(PowerArchitecturePPC64 == 0 || PowerArchitecturePPC64 == 5 ||
74 PowerArchitecturePPC64 == 6 || PowerArchitecturePPC64 == 7,
75 "PowerArchitecturePPC64 should be 0, 5, 6 or 7");
76
77 if (!UseSIGTRAP) {
78 MSG(TrapBasedICMissChecks);
79 MSG(TrapBasedNotEntrantChecks);
80 MSG(TrapBasedNullChecks);
81 FLAG_SET_ERGO(bool, TrapBasedNotEntrantChecks, false);
82 FLAG_SET_ERGO(bool, TrapBasedNullChecks, false);
83 FLAG_SET_ERGO(bool, TrapBasedICMissChecks, false);
84 }
85
86 #ifdef COMPILER2
87 if (!UseSIGTRAP) {
88 MSG(TrapBasedRangeChecks);
89 FLAG_SET_ERGO(bool, TrapBasedRangeChecks, false);
90 }
91
92 // On Power6 test for section size.
93 if (PowerArchitecturePPC64 == 6) {
94 determine_section_size();
95 // TODO: PPC port } else {
96 // TODO: PPC port PdScheduling::power6SectorSize = 0x20;
97 }
98
99 MaxVectorSize = 8;
100 #endif
101
102 // Create and print feature-string.
103 char buf[(num_features+1) * 16]; // Max 16 chars per feature.
104 jio_snprintf(buf, sizeof(buf),
105 "ppc64%s%s%s%s%s%s%s%s%s",
106 (has_fsqrt() ? " fsqrt" : ""),
107 (has_isel() ? " isel" : ""),
108 (has_lxarxeh() ? " lxarxeh" : ""),
109 (has_cmpb() ? " cmpb" : ""),
110 //(has_mftgpr()? " mftgpr" : ""),
111 (has_popcntb() ? " popcntb" : ""),
112 (has_popcntw() ? " popcntw" : ""),
113 (has_fcfids() ? " fcfids" : ""),
114 (has_vand() ? " vand" : ""),
115 (has_vcipher() ? " aes" : "")
116 // Make sure number of %s matches num_features!
117 );
118 _features_str = strdup(buf);
119 NOT_PRODUCT(if (Verbose) print_features(););
120
121 // PPC64 supports 8-byte compare-exchange operations (see
122 // Atomic::cmpxchg and StubGenerator::generate_atomic_cmpxchg_ptr)
123 // and 'atomic long memory ops' (see Unsafe_GetLongVolatile).
124 _supports_cx8 = true;
125
126 UseSSE = 0; // Only on x86 and x64
127
128 intx cache_line_size = _measured_cache_line_size;
129
130 if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) AllocatePrefetchStyle = 1;
131
132 if (AllocatePrefetchStyle == 4) {
133 AllocatePrefetchStepSize = cache_line_size; // Need exact value.
134 if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 12; // Use larger blocks by default.
135 if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 2*cache_line_size; // Default is not defined?
136 } else {
137 if (cache_line_size > AllocatePrefetchStepSize) AllocatePrefetchStepSize = cache_line_size;
138 if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 3; // Optimistic value.
139 if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 3*cache_line_size; // Default is not defined?
140 }
141
142 assert(AllocatePrefetchLines > 0, "invalid value");
143 if (AllocatePrefetchLines < 1) { // Set valid value in product VM.
144 AllocatePrefetchLines = 1; // Conservative value.
145 }
146
147 if (AllocatePrefetchStyle == 3 && AllocatePrefetchDistance < cache_line_size) {
148 AllocatePrefetchStyle = 1; // Fall back if inappropriate.
149 }
150
151 assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive");
152
153 // Implementation does not use any of the vector instructions
154 // available with Power8. Their exploitation is still pending.
155 if (!UseCRC32Intrinsics) {
156 if (FLAG_IS_DEFAULT(UseCRC32Intrinsics)) {
157 FLAG_SET_DEFAULT(UseCRC32Intrinsics, true);
158 }
159 }
160
161 // The AES intrinsic stubs require AES instruction support.
162 #if defined(VM_LITTLE_ENDIAN)
163 if (has_vcipher()) {
164 if (FLAG_IS_DEFAULT(UseAES)) {
165 UseAES = true;
166 }
167 } else if (UseAES) {
168 if (!FLAG_IS_DEFAULT(UseAES))
169 warning("AES instructions are not available on this CPU");
170 FLAG_SET_DEFAULT(UseAES, false);
171 }
172
173 if (UseAES && has_vcipher()) {
174 if (FLAG_IS_DEFAULT(UseAESIntrinsics)) {
175 UseAESIntrinsics = true;
176 }
177 } else if (UseAESIntrinsics) {
178 if (!FLAG_IS_DEFAULT(UseAESIntrinsics))
179 warning("AES intrinsics are not available on this CPU");
180 FLAG_SET_DEFAULT(UseAESIntrinsics, false);
181 }
182
183 #else
184 if (UseAES) {
185 warning("AES instructions are not available on this CPU");
186 FLAG_SET_DEFAULT(UseAES, false);
187 }
188 if (UseAESIntrinsics) {
189 if (!FLAG_IS_DEFAULT(UseAESIntrinsics))
190 warning("AES intrinsics are not available on this CPU");
191 FLAG_SET_DEFAULT(UseAESIntrinsics, false);
192 }
193 #endif
194
195 if (UseSHA) {
196 warning("SHA instructions are not available on this CPU");
197 FLAG_SET_DEFAULT(UseSHA, false);
198 }
199 if (UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics) {
200 warning("SHA intrinsics are not available on this CPU");
201 FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);
202 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);
203 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);
204 }
205
206 if (FLAG_IS_DEFAULT(UseMontgomeryMultiplyIntrinsic)) {
207 UseMontgomeryMultiplyIntrinsic = true;
208 }
209 if (FLAG_IS_DEFAULT(UseMontgomerySquareIntrinsic)) {
210 UseMontgomerySquareIntrinsic = true;
211 }
212 }
213
214 void VM_Version::print_features() {
215 tty->print_cr("Version: %s cache_line_size = %d", cpu_features(), (int) get_cache_line_size());
216 }
217
218 #ifdef COMPILER2
219 // Determine section size on power6: If section size is 8 instructions,
220 // there should be a difference between the two testloops of ~15 %. If
221 // no difference is detected the section is assumed to be 32 instructions.
222 void VM_Version::determine_section_size() {
223
224 int unroll = 80;
225
226 const int code_size = (2* unroll * 32 + 100)*BytesPerInstWord;
227
228 // Allocate space for the code.
229 ResourceMark rm;
230 CodeBuffer cb("detect_section_size", code_size, 0);
231 MacroAssembler* a = new MacroAssembler(&cb);
232
233 uint32_t *code = (uint32_t *)a->pc();
234 // Emit code.
235 void (*test1)() = (void(*)())(void *)a->function_entry();
236
237 Label l1;
238
239 a->li(R4, 1);
240 a->sldi(R4, R4, 28);
241 a->b(l1);
242 a->align(CodeEntryAlignment);
243
244 a->bind(l1);
245
246 for (int i = 0; i < unroll; i++) {
247 // Schleife 1
248 // ------- sector 0 ------------
249 // ;; 0
250 a->nop(); // 1
251 a->fpnop0(); // 2
252 a->fpnop1(); // 3
253 a->addi(R4,R4, -1); // 4
254
255 // ;; 1
256 a->nop(); // 5
257 a->fmr(F6, F6); // 6
258 a->fmr(F7, F7); // 7
259 a->endgroup(); // 8
260 // ------- sector 8 ------------
261
262 // ;; 2
263 a->nop(); // 9
264 a->nop(); // 10
265 a->fmr(F8, F8); // 11
266 a->fmr(F9, F9); // 12
267
268 // ;; 3
269 a->nop(); // 13
270 a->fmr(F10, F10); // 14
271 a->fmr(F11, F11); // 15
272 a->endgroup(); // 16
273 // -------- sector 16 -------------
274
275 // ;; 4
276 a->nop(); // 17
277 a->nop(); // 18
278 a->fmr(F15, F15); // 19
279 a->fmr(F16, F16); // 20
280
281 // ;; 5
282 a->nop(); // 21
283 a->fmr(F17, F17); // 22
284 a->fmr(F18, F18); // 23
285 a->endgroup(); // 24
286 // ------- sector 24 ------------
287
288 // ;; 6
289 a->nop(); // 25
290 a->nop(); // 26
291 a->fmr(F19, F19); // 27
292 a->fmr(F20, F20); // 28
293
294 // ;; 7
295 a->nop(); // 29
296 a->fmr(F21, F21); // 30
297 a->fmr(F22, F22); // 31
298 a->brnop0(); // 32
299
300 // ------- sector 32 ------------
301 }
302
303 // ;; 8
304 a->cmpdi(CCR0, R4, unroll); // 33
305 a->bge(CCR0, l1); // 34
306 a->blr();
307
308 // Emit code.
309 void (*test2)() = (void(*)())(void *)a->function_entry();
310 // uint32_t *code = (uint32_t *)a->pc();
311
312 Label l2;
313
314 a->li(R4, 1);
315 a->sldi(R4, R4, 28);
316 a->b(l2);
317 a->align(CodeEntryAlignment);
318
319 a->bind(l2);
320
321 for (int i = 0; i < unroll; i++) {
322 // Schleife 2
323 // ------- sector 0 ------------
324 // ;; 0
325 a->brnop0(); // 1
326 a->nop(); // 2
327 //a->cmpdi(CCR0, R4, unroll);
328 a->fpnop0(); // 3
329 a->fpnop1(); // 4
330 a->addi(R4,R4, -1); // 5
331
332 // ;; 1
333
334 a->nop(); // 6
335 a->fmr(F6, F6); // 7
336 a->fmr(F7, F7); // 8
337 // ------- sector 8 ---------------
338
339 // ;; 2
340 a->endgroup(); // 9
341
342 // ;; 3
343 a->nop(); // 10
344 a->nop(); // 11
345 a->fmr(F8, F8); // 12
346
347 // ;; 4
348 a->fmr(F9, F9); // 13
349 a->nop(); // 14
350 a->fmr(F10, F10); // 15
351
352 // ;; 5
353 a->fmr(F11, F11); // 16
354 // -------- sector 16 -------------
355
356 // ;; 6
357 a->endgroup(); // 17
358
359 // ;; 7
360 a->nop(); // 18
361 a->nop(); // 19
362 a->fmr(F15, F15); // 20
363
364 // ;; 8
365 a->fmr(F16, F16); // 21
366 a->nop(); // 22
367 a->fmr(F17, F17); // 23
368
369 // ;; 9
370 a->fmr(F18, F18); // 24
371 // -------- sector 24 -------------
372
373 // ;; 10
374 a->endgroup(); // 25
375
376 // ;; 11
377 a->nop(); // 26
378 a->nop(); // 27
379 a->fmr(F19, F19); // 28
380
381 // ;; 12
382 a->fmr(F20, F20); // 29
383 a->nop(); // 30
384 a->fmr(F21, F21); // 31
385
386 // ;; 13
387 a->fmr(F22, F22); // 32
388 }
389
390 // -------- sector 32 -------------
391 // ;; 14
392 a->cmpdi(CCR0, R4, unroll); // 33
393 a->bge(CCR0, l2); // 34
394
395 a->blr();
396 uint32_t *code_end = (uint32_t *)a->pc();
397 a->flush();
398
399 double loop1_seconds,loop2_seconds, rel_diff;
400 uint64_t start1, stop1;
401
402 start1 = os::current_thread_cpu_time(false);
403 (*test1)();
404 stop1 = os::current_thread_cpu_time(false);
405 loop1_seconds = (stop1- start1) / (1000 *1000 *1000.0);
406
407
408 start1 = os::current_thread_cpu_time(false);
409 (*test2)();
410 stop1 = os::current_thread_cpu_time(false);
411
412 loop2_seconds = (stop1 - start1) / (1000 *1000 *1000.0);
413
414 rel_diff = (loop2_seconds - loop1_seconds) / loop1_seconds *100;
415
416 if (PrintAssembly) {
417 ttyLocker ttyl;
418 tty->print_cr("Decoding section size detection stub at " INTPTR_FORMAT " before execution:", p2i(code));
419 Disassembler::decode((u_char*)code, (u_char*)code_end, tty);
420 tty->print_cr("Time loop1 :%f", loop1_seconds);
421 tty->print_cr("Time loop2 :%f", loop2_seconds);
422 tty->print_cr("(time2 - time1) / time1 = %f %%", rel_diff);
423
424 if (rel_diff > 12.0) {
425 tty->print_cr("Section Size 8 Instructions");
426 } else{
427 tty->print_cr("Section Size 32 Instructions or Power5");
428 }
429 }
430
431 #if 0 // TODO: PPC port
432 // Set sector size (if not set explicitly).
433 if (FLAG_IS_DEFAULT(Power6SectorSize128PPC64)) {
434 if (rel_diff > 12.0) {
435 PdScheduling::power6SectorSize = 0x20;
436 } else {
437 PdScheduling::power6SectorSize = 0x80;
438 }
439 } else if (Power6SectorSize128PPC64) {
440 PdScheduling::power6SectorSize = 0x80;
441 } else {
442 PdScheduling::power6SectorSize = 0x20;
443 }
444 #endif
445 if (UsePower6SchedulerPPC64) Unimplemented();
446 }
447 #endif // COMPILER2
448
449 void VM_Version::determine_features() {
450 #if defined(ABI_ELFv2)
451 const int code_size = (num_features+1+2*7)*BytesPerInstWord; // TODO(asmundak): calculation is incorrect.
452 #else
453 // 7 InstWords for each call (function descriptor + blr instruction).
454 const int code_size = (num_features+1+2*7)*BytesPerInstWord;
455 #endif
456 int features = 0;
457
458 // create test area
459 enum { BUFFER_SIZE = 2*4*K }; // Needs to be >=2* max cache line size (cache line size can't exceed min page size).
460 char test_area[BUFFER_SIZE];
461 char *mid_of_test_area = &test_area[BUFFER_SIZE>>1];
462
463 // Allocate space for the code.
464 ResourceMark rm;
465 CodeBuffer cb("detect_cpu_features", code_size, 0);
466 MacroAssembler* a = new MacroAssembler(&cb);
467
468 // Must be set to true so we can generate the test code.
469 _features = VM_Version::all_features_m;
470
471 // Emit code.
472 void (*test)(address addr, uint64_t offset)=(void(*)(address addr, uint64_t offset))(void *)a->function_entry();
473 uint32_t *code = (uint32_t *)a->pc();
474 // Don't use R0 in ldarx.
475 // Keep R3_ARG1 unmodified, it contains &field (see below).
476 // Keep R4_ARG2 unmodified, it contains offset = 0 (see below).
477 a->fsqrt(F3, F4); // code[0] -> fsqrt_m
478 a->fsqrts(F3, F4); // code[1] -> fsqrts_m
479 a->isel(R7, R5, R6, 0); // code[2] -> isel_m
480 a->ldarx_unchecked(R7, R3_ARG1, R4_ARG2, 1); // code[3] -> lxarx_m
481 a->cmpb(R7, R5, R6); // code[4] -> bcmp
482 //a->mftgpr(R7, F3); // code[5] -> mftgpr
483 a->popcntb(R7, R5); // code[6] -> popcntb
484 a->popcntw(R7, R5); // code[7] -> popcntw
485 a->fcfids(F3, F4); // code[8] -> fcfids
486 a->vand(VR0, VR0, VR0); // code[9] -> vand
487 a->vcipher(VR0, VR1, VR2); // code[10] -> vcipher
488 a->blr();
489
490 // Emit function to set one cache line to zero. Emit function descriptor and get pointer to it.
491 void (*zero_cacheline_func_ptr)(char*) = (void(*)(char*))(void *)a->function_entry();
492 a->dcbz(R3_ARG1); // R3_ARG1 = addr
493 a->blr();
494
495 uint32_t *code_end = (uint32_t *)a->pc();
496 a->flush();
497 _features = VM_Version::unknown_m;
498
499 // Print the detection code.
500 if (PrintAssembly) {
501 ttyLocker ttyl;
502 tty->print_cr("Decoding cpu-feature detection stub at " INTPTR_FORMAT " before execution:", p2i(code));
503 Disassembler::decode((u_char*)code, (u_char*)code_end, tty);
504 }
505
506 // Measure cache line size.
507 memset(test_area, 0xFF, BUFFER_SIZE); // Fill test area with 0xFF.
508 (*zero_cacheline_func_ptr)(mid_of_test_area); // Call function which executes dcbz to the middle.
509 int count = 0; // count zeroed bytes
510 for (int i = 0; i < BUFFER_SIZE; i++) if (test_area[i] == 0) count++;
511 guarantee(is_power_of_2(count), "cache line size needs to be a power of 2");
512 _measured_cache_line_size = count;
513
514 // Execute code. Illegal instructions will be replaced by 0 in the signal handler.
515 VM_Version::_is_determine_features_test_running = true;
516 (*test)((address)mid_of_test_area, (uint64_t)0);
517 VM_Version::_is_determine_features_test_running = false;
518
519 // determine which instructions are legal.
520 int feature_cntr = 0;
521 if (code[feature_cntr++]) features |= fsqrt_m;
522 if (code[feature_cntr++]) features |= fsqrts_m;
523 if (code[feature_cntr++]) features |= isel_m;
524 if (code[feature_cntr++]) features |= lxarxeh_m;
525 if (code[feature_cntr++]) features |= cmpb_m;
526 //if(code[feature_cntr++])features |= mftgpr_m;
527 if (code[feature_cntr++]) features |= popcntb_m;
528 if (code[feature_cntr++]) features |= popcntw_m;
529 if (code[feature_cntr++]) features |= fcfids_m;
530 if (code[feature_cntr++]) features |= vand_m;
531 if (code[feature_cntr++]) features |= vcipher_m;
532
533 // Print the detection code.
534 if (PrintAssembly) {
535 ttyLocker ttyl;
536 tty->print_cr("Decoding cpu-feature detection stub at " INTPTR_FORMAT " after execution:", p2i(code));
537 Disassembler::decode((u_char*)code, (u_char*)code_end, tty);
538 }
539
540 _features = features;
541 }
542
543
544 static int saved_features = 0;
545
546 void VM_Version::allow_all() {
547 saved_features = _features;
548 _features = all_features_m;
549 }
550
551 void VM_Version::revert() {
552 _features = saved_features;
553 }