1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "compiler/disassembler.hpp"
29 #include "gc/shared/collectedHeap.inline.hpp"
30 #include "gc/shared/barrierSet.hpp"
31 #include "gc/shared/barrierSetAssembler.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "memory/universe.hpp"
35 #include "oops/accessDecorators.hpp"
36 #include "oops/compressedOops.hpp"
37 #include "oops/klass.inline.hpp"
38 #include "prims/methodHandles.hpp"
39 #include "runtime/biasedLocking.hpp"
40 #include "runtime/flags/flagSetting.hpp"
41 #include "runtime/interfaceSupport.inline.hpp"
42 #include "runtime/jniHandles.inline.hpp"
43 #include "runtime/objectMonitor.hpp"
44 #include "runtime/os.inline.hpp"
45 #include "runtime/safepoint.hpp"
46 #include "runtime/safepointMechanism.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/stubRoutines.hpp"
49 #include "utilities/align.hpp"
50 #include "utilities/macros.hpp"
51 #ifdef COMPILER2
52 #include "opto/intrinsicnode.hpp"
53 #endif
54
55 #ifdef PRODUCT
56 #define BLOCK_COMMENT(str) /* nothing */
57 #define STOP(error) stop(error)
58 #else
59 #define BLOCK_COMMENT(str) block_comment(str)
60 #define STOP(error) block_comment(error); stop(error)
61 #endif
62
63 // Convert the raw encoding form into the form expected by the
64 // constructor for Address.
65 Address Address::make_raw(int base, int index, int scale, int disp, relocInfo::relocType disp_reloc) {
66 assert(scale == 0, "not supported");
67 RelocationHolder rspec;
68 if (disp_reloc != relocInfo::none) {
69 rspec = Relocation::spec_simple(disp_reloc);
70 }
71
72 Register rindex = as_Register(index);
73 if (rindex != G0) {
74 Address madr(as_Register(base), rindex);
75 madr._rspec = rspec;
76 return madr;
77 } else {
78 Address madr(as_Register(base), disp);
79 madr._rspec = rspec;
80 return madr;
81 }
82 }
83
84 Address Argument::address_in_frame() const {
85 // Warning: In LP64 mode disp will occupy more than 10 bits, but
86 // op codes such as ld or ldx, only access disp() to get
87 // their simm13 argument.
88 int disp = ((_number - Argument::n_register_parameters + frame::memory_parameter_word_sp_offset) * BytesPerWord) + STACK_BIAS;
89 if (is_in())
90 return Address(FP, disp); // In argument.
91 else
92 return Address(SP, disp); // Out argument.
93 }
94
95 static const char* argumentNames[][2] = {
96 {"A0","P0"}, {"A1","P1"}, {"A2","P2"}, {"A3","P3"}, {"A4","P4"},
97 {"A5","P5"}, {"A6","P6"}, {"A7","P7"}, {"A8","P8"}, {"A9","P9"},
98 {"A(n>9)","P(n>9)"}
99 };
100
101 const char* Argument::name() const {
102 int nofArgs = sizeof argumentNames / sizeof argumentNames[0];
103 int num = number();
104 if (num >= nofArgs) num = nofArgs - 1;
105 return argumentNames[num][is_in() ? 1 : 0];
106 }
107
108 #ifdef ASSERT
109 // On RISC, there's no benefit to verifying instruction boundaries.
110 bool AbstractAssembler::pd_check_instruction_mark() { return false; }
111 #endif
112
113 // Patch instruction inst at offset inst_pos to refer to dest_pos
114 // and return the resulting instruction.
115 // We should have pcs, not offsets, but since all is relative, it will work out
116 // OK.
117 int MacroAssembler::patched_branch(int dest_pos, int inst, int inst_pos) {
118 int m; // mask for displacement field
119 int v; // new value for displacement field
120 const int word_aligned_ones = -4;
121 switch (inv_op(inst)) {
122 default: ShouldNotReachHere();
123 case call_op: m = wdisp(word_aligned_ones, 0, 30); v = wdisp(dest_pos, inst_pos, 30); break;
124 case branch_op:
125 switch (inv_op2(inst)) {
126 case fbp_op2: m = wdisp( word_aligned_ones, 0, 19); v = wdisp( dest_pos, inst_pos, 19); break;
127 case bp_op2: m = wdisp( word_aligned_ones, 0, 19); v = wdisp( dest_pos, inst_pos, 19); break;
128 case fb_op2: m = wdisp( word_aligned_ones, 0, 22); v = wdisp( dest_pos, inst_pos, 22); break;
129 case br_op2: m = wdisp( word_aligned_ones, 0, 22); v = wdisp( dest_pos, inst_pos, 22); break;
130 case bpr_op2: {
131 if (is_cbcond(inst)) {
132 m = wdisp10(word_aligned_ones, 0);
133 v = wdisp10(dest_pos, inst_pos);
134 } else {
135 m = wdisp16(word_aligned_ones, 0);
136 v = wdisp16(dest_pos, inst_pos);
137 }
138 break;
139 }
140 default: ShouldNotReachHere();
141 }
142 }
143 return inst & ~m | v;
144 }
145
146 // Return the offset of the branch destionation of instruction inst
147 // at offset pos.
148 // Should have pcs, but since all is relative, it works out.
149 int MacroAssembler::branch_destination(int inst, int pos) {
150 int r;
151 switch (inv_op(inst)) {
152 default: ShouldNotReachHere();
153 case call_op: r = inv_wdisp(inst, pos, 30); break;
154 case branch_op:
155 switch (inv_op2(inst)) {
156 case fbp_op2: r = inv_wdisp( inst, pos, 19); break;
157 case bp_op2: r = inv_wdisp( inst, pos, 19); break;
158 case fb_op2: r = inv_wdisp( inst, pos, 22); break;
159 case br_op2: r = inv_wdisp( inst, pos, 22); break;
160 case bpr_op2: {
161 if (is_cbcond(inst)) {
162 r = inv_wdisp10(inst, pos);
163 } else {
164 r = inv_wdisp16(inst, pos);
165 }
166 break;
167 }
168 default: ShouldNotReachHere();
169 }
170 }
171 return r;
172 }
173
174 void MacroAssembler::resolve_jobject(Register value, Register tmp) {
175 Label done, not_weak;
176 br_null(value, false, Assembler::pn, done); // Use NULL as-is.
177 delayed()->andcc(value, JNIHandles::weak_tag_mask, G0); // Test for jweak
178 brx(Assembler::zero, true, Assembler::pt, not_weak);
179 delayed()->nop();
180 access_load_at(T_OBJECT, IN_NATIVE | ON_PHANTOM_OOP_REF,
181 Address(value, -JNIHandles::weak_tag_value), value, tmp);
182 verify_oop(value);
183 br (Assembler::always, true, Assembler::pt, done);
184 delayed()->nop();
185 bind(not_weak);
186 access_load_at(T_OBJECT, IN_NATIVE, Address(value, 0), value, tmp);
187 verify_oop(value);
188 bind(done);
189 }
190
191 void MacroAssembler::null_check(Register reg, int offset) {
192 if (needs_explicit_null_check((intptr_t)offset)) {
193 // provoke OS NULL exception if reg = NULL by
194 // accessing M[reg] w/o changing any registers
195 ld_ptr(reg, 0, G0);
196 }
197 else {
198 // nothing to do, (later) access of M[reg + offset]
199 // will provoke OS NULL exception if reg = NULL
200 }
201 }
202
203 // Ring buffer jumps
204
205
206 void MacroAssembler::jmp2(Register r1, Register r2, const char* file, int line ) {
207 assert_not_delayed();
208 jmpl(r1, r2, G0);
209 }
210 void MacroAssembler::jmp(Register r1, int offset, const char* file, int line ) {
211 assert_not_delayed();
212 jmp(r1, offset);
213 }
214
215 // This code sequence is relocatable to any address, even on LP64.
216 void MacroAssembler::jumpl(const AddressLiteral& addrlit, Register temp, Register d, int offset, const char* file, int line) {
217 assert_not_delayed();
218 // Force fixed length sethi because NativeJump and NativeFarCall don't handle
219 // variable length instruction streams.
220 patchable_sethi(addrlit, temp);
221 Address a(temp, addrlit.low10() + offset); // Add the offset to the displacement.
222 jmpl(a.base(), a.disp(), d);
223 }
224
225 void MacroAssembler::jump(const AddressLiteral& addrlit, Register temp, int offset, const char* file, int line) {
226 jumpl(addrlit, temp, G0, offset, file, line);
227 }
228
229
230 // Conditional breakpoint (for assertion checks in assembly code)
231 void MacroAssembler::breakpoint_trap(Condition c, CC cc) {
232 trap(c, cc, G0, ST_RESERVED_FOR_USER_0);
233 }
234
235 // We want to use ST_BREAKPOINT here, but the debugger is confused by it.
236 void MacroAssembler::breakpoint_trap() {
237 trap(ST_RESERVED_FOR_USER_0);
238 }
239
240 void MacroAssembler::safepoint_poll(Label& slow_path, bool a, Register thread_reg, Register temp_reg) {
241 if (SafepointMechanism::uses_thread_local_poll()) {
242 ldx(Address(thread_reg, Thread::polling_page_offset()), temp_reg, 0);
243 // Armed page has poll bit set.
244 and3(temp_reg, SafepointMechanism::poll_bit(), temp_reg);
245 br_notnull(temp_reg, a, Assembler::pn, slow_path);
246 } else {
247 AddressLiteral sync_state(SafepointSynchronize::address_of_state());
248
249 load_contents(sync_state, temp_reg);
250 cmp(temp_reg, SafepointSynchronize::_not_synchronized);
251 br(Assembler::notEqual, a, Assembler::pn, slow_path);
252 }
253 }
254
255 void MacroAssembler::enter() {
256 Unimplemented();
257 }
258
259 void MacroAssembler::leave() {
260 Unimplemented();
261 }
262
263 // Calls to C land
264
265 #ifdef ASSERT
266 // a hook for debugging
267 static Thread* reinitialize_thread() {
268 return Thread::current();
269 }
270 #else
271 #define reinitialize_thread Thread::current
272 #endif
273
274 #ifdef ASSERT
275 address last_get_thread = NULL;
276 #endif
277
278 // call this when G2_thread is not known to be valid
279 void MacroAssembler::get_thread() {
280 save_frame(0); // to avoid clobbering O0
281 mov(G1, L0); // avoid clobbering G1
282 mov(G5_method, L1); // avoid clobbering G5
283 mov(G3, L2); // avoid clobbering G3 also
284 mov(G4, L5); // avoid clobbering G4
285 #ifdef ASSERT
286 AddressLiteral last_get_thread_addrlit(&last_get_thread);
287 set(last_get_thread_addrlit, L3);
288 rdpc(L4);
289 inc(L4, 3 * BytesPerInstWord); // skip rdpc + inc + st_ptr to point L4 at call st_ptr(L4, L3, 0);
290 #endif
291 call(CAST_FROM_FN_PTR(address, reinitialize_thread), relocInfo::runtime_call_type);
292 delayed()->nop();
293 mov(L0, G1);
294 mov(L1, G5_method);
295 mov(L2, G3);
296 mov(L5, G4);
297 restore(O0, 0, G2_thread);
298 }
299
300 static Thread* verify_thread_subroutine(Thread* gthread_value) {
301 Thread* correct_value = Thread::current();
302 guarantee(gthread_value == correct_value, "G2_thread value must be the thread");
303 return correct_value;
304 }
305
306 void MacroAssembler::verify_thread() {
307 if (VerifyThread) {
308 // NOTE: this chops off the heads of the 64-bit O registers.
309 // make sure G2_thread contains the right value
310 save_frame_and_mov(0, Lmethod, Lmethod); // to avoid clobbering O0 (and propagate Lmethod)
311 mov(G1, L1); // avoid clobbering G1
312 // G2 saved below
313 mov(G3, L3); // avoid clobbering G3
314 mov(G4, L4); // avoid clobbering G4
315 mov(G5_method, L5); // avoid clobbering G5_method
316 call(CAST_FROM_FN_PTR(address,verify_thread_subroutine), relocInfo::runtime_call_type);
317 delayed()->mov(G2_thread, O0);
318
319 mov(L1, G1); // Restore G1
320 // G2 restored below
321 mov(L3, G3); // restore G3
322 mov(L4, G4); // restore G4
323 mov(L5, G5_method); // restore G5_method
324 restore(O0, 0, G2_thread);
325 }
326 }
327
328
329 void MacroAssembler::save_thread(const Register thread_cache) {
330 verify_thread();
331 if (thread_cache->is_valid()) {
332 assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
333 mov(G2_thread, thread_cache);
334 }
335 if (VerifyThread) {
336 // smash G2_thread, as if the VM were about to anyway
337 set(0x67676767, G2_thread);
338 }
339 }
340
341
342 void MacroAssembler::restore_thread(const Register thread_cache) {
343 if (thread_cache->is_valid()) {
344 assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
345 mov(thread_cache, G2_thread);
346 verify_thread();
347 } else {
348 // do it the slow way
349 get_thread();
350 }
351 }
352
353
354 // %%% maybe get rid of [re]set_last_Java_frame
355 void MacroAssembler::set_last_Java_frame(Register last_java_sp, Register last_Java_pc) {
356 assert_not_delayed();
357 Address flags(G2_thread, JavaThread::frame_anchor_offset() +
358 JavaFrameAnchor::flags_offset());
359 Address pc_addr(G2_thread, JavaThread::last_Java_pc_offset());
360
361 // Always set last_Java_pc and flags first because once last_Java_sp is visible
362 // has_last_Java_frame is true and users will look at the rest of the fields.
363 // (Note: flags should always be zero before we get here so doesn't need to be set.)
364
365 #ifdef ASSERT
366 // Verify that flags was zeroed on return to Java
367 Label PcOk;
368 save_frame(0); // to avoid clobbering O0
369 ld_ptr(pc_addr, L0);
370 br_null_short(L0, Assembler::pt, PcOk);
371 STOP("last_Java_pc not zeroed before leaving Java");
372 bind(PcOk);
373
374 // Verify that flags was zeroed on return to Java
375 Label FlagsOk;
376 ld(flags, L0);
377 tst(L0);
378 br(Assembler::zero, false, Assembler::pt, FlagsOk);
379 delayed() -> restore();
380 STOP("flags not zeroed before leaving Java");
381 bind(FlagsOk);
382 #endif /* ASSERT */
383 //
384 // When returning from calling out from Java mode the frame anchor's last_Java_pc
385 // will always be set to NULL. It is set here so that if we are doing a call to
386 // native (not VM) that we capture the known pc and don't have to rely on the
387 // native call having a standard frame linkage where we can find the pc.
388
389 if (last_Java_pc->is_valid()) {
390 st_ptr(last_Java_pc, pc_addr);
391 }
392
393 #ifdef ASSERT
394 // Make sure that we have an odd stack
395 Label StackOk;
396 andcc(last_java_sp, 0x01, G0);
397 br(Assembler::notZero, false, Assembler::pt, StackOk);
398 delayed()->nop();
399 STOP("Stack Not Biased in set_last_Java_frame");
400 bind(StackOk);
401 #endif // ASSERT
402 assert( last_java_sp != G4_scratch, "bad register usage in set_last_Java_frame");
403 add( last_java_sp, STACK_BIAS, G4_scratch );
404 st_ptr(G4_scratch, G2_thread, JavaThread::last_Java_sp_offset());
405 }
406
407 void MacroAssembler::reset_last_Java_frame(void) {
408 assert_not_delayed();
409
410 Address sp_addr(G2_thread, JavaThread::last_Java_sp_offset());
411 Address pc_addr(G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::last_Java_pc_offset());
412 Address flags (G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::flags_offset());
413
414 #ifdef ASSERT
415 // check that it WAS previously set
416 save_frame_and_mov(0, Lmethod, Lmethod); // Propagate Lmethod to helper frame
417 ld_ptr(sp_addr, L0);
418 tst(L0);
419 breakpoint_trap(Assembler::zero, Assembler::ptr_cc);
420 restore();
421 #endif // ASSERT
422
423 st_ptr(G0, sp_addr);
424 // Always return last_Java_pc to zero
425 st_ptr(G0, pc_addr);
426 // Always null flags after return to Java
427 st(G0, flags);
428 }
429
430
431 void MacroAssembler::call_VM_base(
432 Register oop_result,
433 Register thread_cache,
434 Register last_java_sp,
435 address entry_point,
436 int number_of_arguments,
437 bool check_exceptions)
438 {
439 assert_not_delayed();
440
441 // determine last_java_sp register
442 if (!last_java_sp->is_valid()) {
443 last_java_sp = SP;
444 }
445 // debugging support
446 assert(number_of_arguments >= 0 , "cannot have negative number of arguments");
447
448 // 64-bit last_java_sp is biased!
449 set_last_Java_frame(last_java_sp, noreg);
450 if (VerifyThread) mov(G2_thread, O0); // about to be smashed; pass early
451 save_thread(thread_cache);
452 // do the call
453 call(entry_point, relocInfo::runtime_call_type);
454 if (!VerifyThread)
455 delayed()->mov(G2_thread, O0); // pass thread as first argument
456 else
457 delayed()->nop(); // (thread already passed)
458 restore_thread(thread_cache);
459 reset_last_Java_frame();
460
461 // check for pending exceptions. use Gtemp as scratch register.
462 if (check_exceptions) {
463 check_and_forward_exception(Gtemp);
464 }
465
466 #ifdef ASSERT
467 set(badHeapWordVal, G3);
468 set(badHeapWordVal, G4);
469 set(badHeapWordVal, G5);
470 #endif
471
472 // get oop result if there is one and reset the value in the thread
473 if (oop_result->is_valid()) {
474 get_vm_result(oop_result);
475 }
476 }
477
478 void MacroAssembler::check_and_forward_exception(Register scratch_reg)
479 {
480 Label L;
481
482 check_and_handle_popframe(scratch_reg);
483 check_and_handle_earlyret(scratch_reg);
484
485 Address exception_addr(G2_thread, Thread::pending_exception_offset());
486 ld_ptr(exception_addr, scratch_reg);
487 br_null_short(scratch_reg, pt, L);
488 // we use O7 linkage so that forward_exception_entry has the issuing PC
489 call(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);
490 delayed()->nop();
491 bind(L);
492 }
493
494
495 void MacroAssembler::check_and_handle_popframe(Register scratch_reg) {
496 }
497
498
499 void MacroAssembler::check_and_handle_earlyret(Register scratch_reg) {
500 }
501
502
503 void MacroAssembler::call_VM(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) {
504 call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions);
505 }
506
507
508 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions) {
509 // O0 is reserved for the thread
510 mov(arg_1, O1);
511 call_VM(oop_result, entry_point, 1, check_exceptions);
512 }
513
514
515 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
516 // O0 is reserved for the thread
517 mov(arg_1, O1);
518 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
519 call_VM(oop_result, entry_point, 2, check_exceptions);
520 }
521
522
523 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions) {
524 // O0 is reserved for the thread
525 mov(arg_1, O1);
526 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
527 mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
528 call_VM(oop_result, entry_point, 3, check_exceptions);
529 }
530
531
532
533 // Note: The following call_VM overloadings are useful when a "save"
534 // has already been performed by a stub, and the last Java frame is
535 // the previous one. In that case, last_java_sp must be passed as FP
536 // instead of SP.
537
538
539 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, int number_of_arguments, bool check_exceptions) {
540 call_VM_base(oop_result, noreg, last_java_sp, entry_point, number_of_arguments, check_exceptions);
541 }
542
543
544 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions) {
545 // O0 is reserved for the thread
546 mov(arg_1, O1);
547 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions);
548 }
549
550
551 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
552 // O0 is reserved for the thread
553 mov(arg_1, O1);
554 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
555 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions);
556 }
557
558
559 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions) {
560 // O0 is reserved for the thread
561 mov(arg_1, O1);
562 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
563 mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
564 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions);
565 }
566
567
568
569 void MacroAssembler::call_VM_leaf_base(Register thread_cache, address entry_point, int number_of_arguments) {
570 assert_not_delayed();
571 save_thread(thread_cache);
572 // do the call
573 call(entry_point, relocInfo::runtime_call_type);
574 delayed()->nop();
575 restore_thread(thread_cache);
576 #ifdef ASSERT
577 set(badHeapWordVal, G3);
578 set(badHeapWordVal, G4);
579 set(badHeapWordVal, G5);
580 #endif
581 }
582
583
584 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, int number_of_arguments) {
585 call_VM_leaf_base(thread_cache, entry_point, number_of_arguments);
586 }
587
588
589 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1) {
590 mov(arg_1, O0);
591 call_VM_leaf(thread_cache, entry_point, 1);
592 }
593
594
595 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2) {
596 mov(arg_1, O0);
597 mov(arg_2, O1); assert(arg_2 != O0, "smashed argument");
598 call_VM_leaf(thread_cache, entry_point, 2);
599 }
600
601
602 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2, Register arg_3) {
603 mov(arg_1, O0);
604 mov(arg_2, O1); assert(arg_2 != O0, "smashed argument");
605 mov(arg_3, O2); assert(arg_3 != O0 && arg_3 != O1, "smashed argument");
606 call_VM_leaf(thread_cache, entry_point, 3);
607 }
608
609
610 void MacroAssembler::get_vm_result(Register oop_result) {
611 verify_thread();
612 Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
613 ld_ptr( vm_result_addr, oop_result);
614 st_ptr(G0, vm_result_addr);
615 verify_oop(oop_result);
616 }
617
618
619 void MacroAssembler::get_vm_result_2(Register metadata_result) {
620 verify_thread();
621 Address vm_result_addr_2(G2_thread, JavaThread::vm_result_2_offset());
622 ld_ptr(vm_result_addr_2, metadata_result);
623 st_ptr(G0, vm_result_addr_2);
624 }
625
626
627 // We require that C code which does not return a value in vm_result will
628 // leave it undisturbed.
629 void MacroAssembler::set_vm_result(Register oop_result) {
630 verify_thread();
631 Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
632 verify_oop(oop_result);
633
634 # ifdef ASSERT
635 // Check that we are not overwriting any other oop.
636 save_frame_and_mov(0, Lmethod, Lmethod); // Propagate Lmethod
637 ld_ptr(vm_result_addr, L0);
638 tst(L0);
639 restore();
640 breakpoint_trap(notZero, Assembler::ptr_cc);
641 // }
642 # endif
643
644 st_ptr(oop_result, vm_result_addr);
645 }
646
647
648 void MacroAssembler::ic_call(address entry, bool emit_delay, jint method_index) {
649 RelocationHolder rspec = virtual_call_Relocation::spec(pc(), method_index);
650 patchable_set((intptr_t)Universe::non_oop_word(), G5_inline_cache_reg);
651 relocate(rspec);
652 call(entry, relocInfo::none);
653 if (emit_delay) {
654 delayed()->nop();
655 }
656 }
657
658
659 void MacroAssembler::internal_sethi(const AddressLiteral& addrlit, Register d, bool ForceRelocatable) {
660 address save_pc;
661 int shiftcnt;
662 #ifdef VALIDATE_PIPELINE
663 assert_no_delay("Cannot put two instructions in delay-slot.");
664 #endif
665 v9_dep();
666 save_pc = pc();
667
668 int msb32 = (int) (addrlit.value() >> 32);
669 int lsb32 = (int) (addrlit.value());
670
671 if (msb32 == 0 && lsb32 >= 0) {
672 Assembler::sethi(lsb32, d, addrlit.rspec());
673 }
674 else if (msb32 == -1) {
675 Assembler::sethi(~lsb32, d, addrlit.rspec());
676 xor3(d, ~low10(~0), d);
677 }
678 else {
679 Assembler::sethi(msb32, d, addrlit.rspec()); // msb 22-bits
680 if (msb32 & 0x3ff) // Any bits?
681 or3(d, msb32 & 0x3ff, d); // msb 32-bits are now in lsb 32
682 if (lsb32 & 0xFFFFFC00) { // done?
683 if ((lsb32 >> 20) & 0xfff) { // Any bits set?
684 sllx(d, 12, d); // Make room for next 12 bits
685 or3(d, (lsb32 >> 20) & 0xfff, d); // Or in next 12
686 shiftcnt = 0; // We already shifted
687 }
688 else
689 shiftcnt = 12;
690 if ((lsb32 >> 10) & 0x3ff) {
691 sllx(d, shiftcnt + 10, d); // Make room for last 10 bits
692 or3(d, (lsb32 >> 10) & 0x3ff, d); // Or in next 10
693 shiftcnt = 0;
694 }
695 else
696 shiftcnt = 10;
697 sllx(d, shiftcnt + 10, d); // Shift leaving disp field 0'd
698 }
699 else
700 sllx(d, 32, d);
701 }
702 // Pad out the instruction sequence so it can be patched later.
703 if (ForceRelocatable || (addrlit.rtype() != relocInfo::none &&
704 addrlit.rtype() != relocInfo::runtime_call_type)) {
705 while (pc() < (save_pc + (7 * BytesPerInstWord)))
706 nop();
707 }
708 }
709
710
711 void MacroAssembler::sethi(const AddressLiteral& addrlit, Register d) {
712 internal_sethi(addrlit, d, false);
713 }
714
715
716 void MacroAssembler::patchable_sethi(const AddressLiteral& addrlit, Register d) {
717 internal_sethi(addrlit, d, true);
718 }
719
720
721 int MacroAssembler::insts_for_sethi(address a, bool worst_case) {
722 if (worst_case) return 7;
723 intptr_t iaddr = (intptr_t) a;
724 int msb32 = (int) (iaddr >> 32);
725 int lsb32 = (int) (iaddr);
726 int count;
727 if (msb32 == 0 && lsb32 >= 0)
728 count = 1;
729 else if (msb32 == -1)
730 count = 2;
731 else {
732 count = 2;
733 if (msb32 & 0x3ff)
734 count++;
735 if (lsb32 & 0xFFFFFC00 ) {
736 if ((lsb32 >> 20) & 0xfff) count += 2;
737 if ((lsb32 >> 10) & 0x3ff) count += 2;
738 }
739 }
740 return count;
741 }
742
743 int MacroAssembler::worst_case_insts_for_set() {
744 return insts_for_sethi(NULL, true) + 1;
745 }
746
747
748 // Keep in sync with MacroAssembler::insts_for_internal_set
749 void MacroAssembler::internal_set(const AddressLiteral& addrlit, Register d, bool ForceRelocatable) {
750 intptr_t value = addrlit.value();
751
752 if (!ForceRelocatable && addrlit.rspec().type() == relocInfo::none) {
753 // can optimize
754 if (-4096 <= value && value <= 4095) {
755 or3(G0, value, d); // setsw (this leaves upper 32 bits sign-extended)
756 return;
757 }
758 if (inv_hi22(hi22(value)) == value) {
759 sethi(addrlit, d);
760 return;
761 }
762 }
763 assert_no_delay("Cannot put two instructions in delay-slot.");
764 internal_sethi(addrlit, d, ForceRelocatable);
765 if (ForceRelocatable || addrlit.rspec().type() != relocInfo::none || addrlit.low10() != 0) {
766 add(d, addrlit.low10(), d, addrlit.rspec());
767 }
768 }
769
770 // Keep in sync with MacroAssembler::internal_set
771 int MacroAssembler::insts_for_internal_set(intptr_t value) {
772 // can optimize
773 if (-4096 <= value && value <= 4095) {
774 return 1;
775 }
776 if (inv_hi22(hi22(value)) == value) {
777 return insts_for_sethi((address) value);
778 }
779 int count = insts_for_sethi((address) value);
780 AddressLiteral al(value);
781 if (al.low10() != 0) {
782 count++;
783 }
784 return count;
785 }
786
787 void MacroAssembler::set(const AddressLiteral& al, Register d) {
788 internal_set(al, d, false);
789 }
790
791 void MacroAssembler::set(intptr_t value, Register d) {
792 AddressLiteral al(value);
793 internal_set(al, d, false);
794 }
795
796 void MacroAssembler::set(address addr, Register d, RelocationHolder const& rspec) {
797 AddressLiteral al(addr, rspec);
798 internal_set(al, d, false);
799 }
800
801 void MacroAssembler::patchable_set(const AddressLiteral& al, Register d) {
802 internal_set(al, d, true);
803 }
804
805 void MacroAssembler::patchable_set(intptr_t value, Register d) {
806 AddressLiteral al(value);
807 internal_set(al, d, true);
808 }
809
810
811 void MacroAssembler::set64(jlong value, Register d, Register tmp) {
812 assert_not_delayed();
813 v9_dep();
814
815 int hi = (int)(value >> 32);
816 int lo = (int)(value & ~0);
817 int bits_33to2 = (int)((value >> 2) & ~0);
818 // (Matcher::isSimpleConstant64 knows about the following optimizations.)
819 if (Assembler::is_simm13(lo) && value == lo) {
820 or3(G0, lo, d);
821 } else if (hi == 0) {
822 Assembler::sethi(lo, d); // hardware version zero-extends to upper 32
823 if (low10(lo) != 0)
824 or3(d, low10(lo), d);
825 }
826 else if ((hi >> 2) == 0) {
827 Assembler::sethi(bits_33to2, d); // hardware version zero-extends to upper 32
828 sllx(d, 2, d);
829 if (low12(lo) != 0)
830 or3(d, low12(lo), d);
831 }
832 else if (hi == -1) {
833 Assembler::sethi(~lo, d); // hardware version zero-extends to upper 32
834 xor3(d, low10(lo) ^ ~low10(~0), d);
835 }
836 else if (lo == 0) {
837 if (Assembler::is_simm13(hi)) {
838 or3(G0, hi, d);
839 } else {
840 Assembler::sethi(hi, d); // hardware version zero-extends to upper 32
841 if (low10(hi) != 0)
842 or3(d, low10(hi), d);
843 }
844 sllx(d, 32, d);
845 }
846 else {
847 Assembler::sethi(hi, tmp);
848 Assembler::sethi(lo, d); // macro assembler version sign-extends
849 if (low10(hi) != 0)
850 or3 (tmp, low10(hi), tmp);
851 if (low10(lo) != 0)
852 or3 ( d, low10(lo), d);
853 sllx(tmp, 32, tmp);
854 or3 (d, tmp, d);
855 }
856 }
857
858 int MacroAssembler::insts_for_set64(jlong value) {
859 v9_dep();
860
861 int hi = (int) (value >> 32);
862 int lo = (int) (value & ~0);
863 int count = 0;
864
865 // (Matcher::isSimpleConstant64 knows about the following optimizations.)
866 if (Assembler::is_simm13(lo) && value == lo) {
867 count++;
868 } else if (hi == 0) {
869 count++;
870 if (low10(lo) != 0)
871 count++;
872 }
873 else if (hi == -1) {
874 count += 2;
875 }
876 else if (lo == 0) {
877 if (Assembler::is_simm13(hi)) {
878 count++;
879 } else {
880 count++;
881 if (low10(hi) != 0)
882 count++;
883 }
884 count++;
885 }
886 else {
887 count += 2;
888 if (low10(hi) != 0)
889 count++;
890 if (low10(lo) != 0)
891 count++;
892 count += 2;
893 }
894 return count;
895 }
896
897 // compute size in bytes of sparc frame, given
898 // number of extraWords
899 int MacroAssembler::total_frame_size_in_bytes(int extraWords) {
900
901 int nWords = frame::memory_parameter_word_sp_offset;
902
903 nWords += extraWords;
904
905 if (nWords & 1) ++nWords; // round up to double-word
906
907 return nWords * BytesPerWord;
908 }
909
910
911 // save_frame: given number of "extra" words in frame,
912 // issue approp. save instruction (p 200, v8 manual)
913
914 void MacroAssembler::save_frame(int extraWords) {
915 int delta = -total_frame_size_in_bytes(extraWords);
916 if (is_simm13(delta)) {
917 save(SP, delta, SP);
918 } else {
919 set(delta, G3_scratch);
920 save(SP, G3_scratch, SP);
921 }
922 }
923
924
925 void MacroAssembler::save_frame_c1(int size_in_bytes) {
926 if (is_simm13(-size_in_bytes)) {
927 save(SP, -size_in_bytes, SP);
928 } else {
929 set(-size_in_bytes, G3_scratch);
930 save(SP, G3_scratch, SP);
931 }
932 }
933
934
935 void MacroAssembler::save_frame_and_mov(int extraWords,
936 Register s1, Register d1,
937 Register s2, Register d2) {
938 assert_not_delayed();
939
940 // The trick here is to use precisely the same memory word
941 // that trap handlers also use to save the register.
942 // This word cannot be used for any other purpose, but
943 // it works fine to save the register's value, whether or not
944 // an interrupt flushes register windows at any given moment!
945 Address s1_addr;
946 if (s1->is_valid() && (s1->is_in() || s1->is_local())) {
947 s1_addr = s1->address_in_saved_window();
948 st_ptr(s1, s1_addr);
949 }
950
951 Address s2_addr;
952 if (s2->is_valid() && (s2->is_in() || s2->is_local())) {
953 s2_addr = s2->address_in_saved_window();
954 st_ptr(s2, s2_addr);
955 }
956
957 save_frame(extraWords);
958
959 if (s1_addr.base() == SP) {
960 ld_ptr(s1_addr.after_save(), d1);
961 } else if (s1->is_valid()) {
962 mov(s1->after_save(), d1);
963 }
964
965 if (s2_addr.base() == SP) {
966 ld_ptr(s2_addr.after_save(), d2);
967 } else if (s2->is_valid()) {
968 mov(s2->after_save(), d2);
969 }
970 }
971
972
973 AddressLiteral MacroAssembler::allocate_metadata_address(Metadata* obj) {
974 assert(oop_recorder() != NULL, "this assembler needs a Recorder");
975 int index = oop_recorder()->allocate_metadata_index(obj);
976 RelocationHolder rspec = metadata_Relocation::spec(index);
977 return AddressLiteral((address)obj, rspec);
978 }
979
980 AddressLiteral MacroAssembler::constant_metadata_address(Metadata* obj) {
981 assert(oop_recorder() != NULL, "this assembler needs a Recorder");
982 int index = oop_recorder()->find_index(obj);
983 RelocationHolder rspec = metadata_Relocation::spec(index);
984 return AddressLiteral((address)obj, rspec);
985 }
986
987
988 AddressLiteral MacroAssembler::constant_oop_address(jobject obj) {
989 #ifdef ASSERT
990 {
991 ThreadInVMfromUnknown tiv;
992 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
993 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "not an oop");
994 }
995 #endif
996 int oop_index = oop_recorder()->find_index(obj);
997 return AddressLiteral(obj, oop_Relocation::spec(oop_index));
998 }
999
1000 void MacroAssembler::set_narrow_oop(jobject obj, Register d) {
1001 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1002 int oop_index = oop_recorder()->find_index(obj);
1003 RelocationHolder rspec = oop_Relocation::spec(oop_index);
1004
1005 assert_not_delayed();
1006 // Relocation with special format (see relocInfo_sparc.hpp).
1007 relocate(rspec, 1);
1008 // Assembler::sethi(0x3fffff, d);
1009 emit_int32( op(branch_op) | rd(d) | op2(sethi_op2) | hi22(0x3fffff) );
1010 // Don't add relocation for 'add'. Do patching during 'sethi' processing.
1011 add(d, 0x3ff, d);
1012
1013 }
1014
1015 void MacroAssembler::set_narrow_klass(Klass* k, Register d) {
1016 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1017 int klass_index = oop_recorder()->find_index(k);
1018 RelocationHolder rspec = metadata_Relocation::spec(klass_index);
1019 narrowOop encoded_k = CompressedKlassPointers::encode(k);
1020
1021 assert_not_delayed();
1022 // Relocation with special format (see relocInfo_sparc.hpp).
1023 relocate(rspec, 1);
1024 // Assembler::sethi(encoded_k, d);
1025 emit_int32( op(branch_op) | rd(d) | op2(sethi_op2) | hi22(encoded_k) );
1026 // Don't add relocation for 'add'. Do patching during 'sethi' processing.
1027 add(d, low10(encoded_k), d);
1028
1029 }
1030
1031 void MacroAssembler::align(int modulus) {
1032 while (offset() % modulus != 0) nop();
1033 }
1034
1035 void RegistersForDebugging::print(outputStream* s) {
1036 FlagSetting fs(Debugging, true);
1037 int j;
1038 for (j = 0; j < 8; ++j) {
1039 if (j != 6) { s->print("i%d = ", j); os::print_location(s, i[j]); }
1040 else { s->print( "fp = " ); os::print_location(s, i[j]); }
1041 }
1042 s->cr();
1043
1044 for (j = 0; j < 8; ++j) {
1045 s->print("l%d = ", j); os::print_location(s, l[j]);
1046 }
1047 s->cr();
1048
1049 for (j = 0; j < 8; ++j) {
1050 if (j != 6) { s->print("o%d = ", j); os::print_location(s, o[j]); }
1051 else { s->print( "sp = " ); os::print_location(s, o[j]); }
1052 }
1053 s->cr();
1054
1055 for (j = 0; j < 8; ++j) {
1056 s->print("g%d = ", j); os::print_location(s, g[j]);
1057 }
1058 s->cr();
1059
1060 // print out floats with compression
1061 for (j = 0; j < 32; ) {
1062 jfloat val = f[j];
1063 int last = j;
1064 for ( ; last+1 < 32; ++last ) {
1065 char b1[1024], b2[1024];
1066 sprintf(b1, "%f", val);
1067 sprintf(b2, "%f", f[last+1]);
1068 if (strcmp(b1, b2))
1069 break;
1070 }
1071 s->print("f%d", j);
1072 if ( j != last ) s->print(" - f%d", last);
1073 s->print(" = %f", val);
1074 s->fill_to(25);
1075 s->print_cr(" (0x%x)", *(int*)&val);
1076 j = last + 1;
1077 }
1078 s->cr();
1079
1080 // and doubles (evens only)
1081 for (j = 0; j < 32; ) {
1082 jdouble val = d[j];
1083 int last = j;
1084 for ( ; last+1 < 32; ++last ) {
1085 char b1[1024], b2[1024];
1086 sprintf(b1, "%f", val);
1087 sprintf(b2, "%f", d[last+1]);
1088 if (strcmp(b1, b2))
1089 break;
1090 }
1091 s->print("d%d", 2 * j);
1092 if ( j != last ) s->print(" - d%d", last);
1093 s->print(" = %f", val);
1094 s->fill_to(30);
1095 s->print("(0x%x)", *(int*)&val);
1096 s->fill_to(42);
1097 s->print_cr("(0x%x)", *(1 + (int*)&val));
1098 j = last + 1;
1099 }
1100 s->cr();
1101 }
1102
1103 void RegistersForDebugging::save_registers(MacroAssembler* a) {
1104 a->sub(FP, align_up(sizeof(RegistersForDebugging), sizeof(jdouble)) - STACK_BIAS, O0);
1105 a->flushw();
1106 int i;
1107 for (i = 0; i < 8; ++i) {
1108 a->ld_ptr(as_iRegister(i)->address_in_saved_window().after_save(), L1); a->st_ptr( L1, O0, i_offset(i));
1109 a->ld_ptr(as_lRegister(i)->address_in_saved_window().after_save(), L1); a->st_ptr( L1, O0, l_offset(i));
1110 a->st_ptr(as_oRegister(i)->after_save(), O0, o_offset(i));
1111 a->st_ptr(as_gRegister(i)->after_save(), O0, g_offset(i));
1112 }
1113 for (i = 0; i < 32; ++i) {
1114 a->stf(FloatRegisterImpl::S, as_FloatRegister(i), O0, f_offset(i));
1115 }
1116 for (i = 0; i < 64; i += 2) {
1117 a->stf(FloatRegisterImpl::D, as_FloatRegister(i), O0, d_offset(i));
1118 }
1119 }
1120
1121 void RegistersForDebugging::restore_registers(MacroAssembler* a, Register r) {
1122 for (int i = 1; i < 8; ++i) {
1123 a->ld_ptr(r, g_offset(i), as_gRegister(i));
1124 }
1125 for (int j = 0; j < 32; ++j) {
1126 a->ldf(FloatRegisterImpl::S, O0, f_offset(j), as_FloatRegister(j));
1127 }
1128 for (int k = 0; k < 64; k += 2) {
1129 a->ldf(FloatRegisterImpl::D, O0, d_offset(k), as_FloatRegister(k));
1130 }
1131 }
1132
1133
1134 // pushes double TOS element of FPU stack on CPU stack; pops from FPU stack
1135 void MacroAssembler::push_fTOS() {
1136 // %%%%%% need to implement this
1137 }
1138
1139 // pops double TOS element from CPU stack and pushes on FPU stack
1140 void MacroAssembler::pop_fTOS() {
1141 // %%%%%% need to implement this
1142 }
1143
1144 void MacroAssembler::empty_FPU_stack() {
1145 // %%%%%% need to implement this
1146 }
1147
1148 void MacroAssembler::_verify_oop(Register reg, const char* msg, const char * file, int line) {
1149 // plausibility check for oops
1150 if (!VerifyOops) return;
1151
1152 if (reg == G0) return; // always NULL, which is always an oop
1153
1154 BLOCK_COMMENT("verify_oop {");
1155 char buffer[64];
1156 #ifdef COMPILER1
1157 if (CommentedAssembly) {
1158 snprintf(buffer, sizeof(buffer), "verify_oop at %d", offset());
1159 block_comment(buffer);
1160 }
1161 #endif
1162
1163 const char* real_msg = NULL;
1164 {
1165 ResourceMark rm;
1166 stringStream ss;
1167 ss.print("%s at offset %d (%s:%d)", msg, offset(), file, line);
1168 real_msg = code_string(ss.as_string());
1169 }
1170
1171 // Call indirectly to solve generation ordering problem
1172 AddressLiteral a(StubRoutines::verify_oop_subroutine_entry_address());
1173
1174 // Make some space on stack above the current register window.
1175 // Enough to hold 8 64-bit registers.
1176 add(SP,-8*8,SP);
1177
1178 // Save some 64-bit registers; a normal 'save' chops the heads off
1179 // of 64-bit longs in the 32-bit build.
1180 stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
1181 stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
1182 mov(reg,O0); // Move arg into O0; arg might be in O7 which is about to be crushed
1183 stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
1184
1185 // Size of set() should stay the same
1186 patchable_set((intptr_t)real_msg, O1);
1187 // Load address to call to into O7
1188 load_ptr_contents(a, O7);
1189 // Register call to verify_oop_subroutine
1190 callr(O7, G0);
1191 delayed()->nop();
1192 // recover frame size
1193 add(SP, 8*8,SP);
1194 BLOCK_COMMENT("} verify_oop");
1195 }
1196
1197 void MacroAssembler::_verify_oop_addr(Address addr, const char* msg, const char * file, int line) {
1198 // plausibility check for oops
1199 if (!VerifyOops) return;
1200
1201 const char* real_msg = NULL;
1202 {
1203 ResourceMark rm;
1204 stringStream ss;
1205 ss.print("%s at SP+%d (%s:%d)", msg, addr.disp(), file, line);
1206 real_msg = code_string(ss.as_string());
1207 }
1208
1209 // Call indirectly to solve generation ordering problem
1210 AddressLiteral a(StubRoutines::verify_oop_subroutine_entry_address());
1211
1212 // Make some space on stack above the current register window.
1213 // Enough to hold 8 64-bit registers.
1214 add(SP,-8*8,SP);
1215
1216 // Save some 64-bit registers; a normal 'save' chops the heads off
1217 // of 64-bit longs in the 32-bit build.
1218 stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
1219 stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
1220 ld_ptr(addr.base(), addr.disp() + 8*8, O0); // Load arg into O0; arg might be in O7 which is about to be crushed
1221 stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
1222
1223 // Size of set() should stay the same
1224 patchable_set((intptr_t)real_msg, O1);
1225 // Load address to call to into O7
1226 load_ptr_contents(a, O7);
1227 // Register call to verify_oop_subroutine
1228 callr(O7, G0);
1229 delayed()->nop();
1230 // recover frame size
1231 add(SP, 8*8,SP);
1232 }
1233
1234 // side-door communication with signalHandler in os_solaris.cpp
1235 address MacroAssembler::_verify_oop_implicit_branch[3] = { NULL };
1236
1237 // This macro is expanded just once; it creates shared code. Contract:
1238 // receives an oop in O0. Must restore O0 & O7 from TLS. Must not smash ANY
1239 // registers, including flags. May not use a register 'save', as this blows
1240 // the high bits of the O-regs if they contain Long values. Acts as a 'leaf'
1241 // call.
1242 void MacroAssembler::verify_oop_subroutine() {
1243 // Leaf call; no frame.
1244 Label succeed, fail, null_or_fail;
1245
1246 // O0 and O7 were saved already (O0 in O0's TLS home, O7 in O5's TLS home).
1247 // O0 is now the oop to be checked. O7 is the return address.
1248 Register O0_obj = O0;
1249
1250 // Save some more registers for temps.
1251 stx(O2,SP,frame::register_save_words*wordSize+STACK_BIAS+2*8);
1252 stx(O3,SP,frame::register_save_words*wordSize+STACK_BIAS+3*8);
1253 stx(O4,SP,frame::register_save_words*wordSize+STACK_BIAS+4*8);
1254 stx(O5,SP,frame::register_save_words*wordSize+STACK_BIAS+5*8);
1255
1256 // Save flags
1257 Register O5_save_flags = O5;
1258 rdccr( O5_save_flags );
1259
1260 { // count number of verifies
1261 Register O2_adr = O2;
1262 Register O3_accum = O3;
1263 inc_counter(StubRoutines::verify_oop_count_addr(), O2_adr, O3_accum);
1264 }
1265
1266 Register O2_mask = O2;
1267 Register O3_bits = O3;
1268 Register O4_temp = O4;
1269
1270 // mark lower end of faulting range
1271 assert(_verify_oop_implicit_branch[0] == NULL, "set once");
1272 _verify_oop_implicit_branch[0] = pc();
1273
1274 // We can't check the mark oop because it could be in the process of
1275 // locking or unlocking while this is running.
1276 set(Universe::verify_oop_mask (), O2_mask);
1277 set(Universe::verify_oop_bits (), O3_bits);
1278
1279 // assert((obj & oop_mask) == oop_bits);
1280 and3(O0_obj, O2_mask, O4_temp);
1281 cmp_and_brx_short(O4_temp, O3_bits, notEqual, pn, null_or_fail);
1282
1283 if ((NULL_WORD & Universe::verify_oop_mask()) == Universe::verify_oop_bits()) {
1284 // the null_or_fail case is useless; must test for null separately
1285 br_null_short(O0_obj, pn, succeed);
1286 }
1287
1288 // Check the Klass* of this object for being in the right area of memory.
1289 // Cannot do the load in the delay above slot in case O0 is null
1290 load_klass(O0_obj, O0_obj);
1291 // assert((klass != NULL)
1292 br_null_short(O0_obj, pn, fail);
1293
1294 wrccr( O5_save_flags ); // Restore CCR's
1295
1296 // mark upper end of faulting range
1297 _verify_oop_implicit_branch[1] = pc();
1298
1299 //-----------------------
1300 // all tests pass
1301 bind(succeed);
1302
1303 // Restore prior 64-bit registers
1304 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+0*8,O0);
1305 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+1*8,O1);
1306 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+2*8,O2);
1307 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+3*8,O3);
1308 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+4*8,O4);
1309 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+5*8,O5);
1310
1311 retl(); // Leaf return; restore prior O7 in delay slot
1312 delayed()->ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+7*8,O7);
1313
1314 //-----------------------
1315 bind(null_or_fail); // nulls are less common but OK
1316 br_null(O0_obj, false, pt, succeed);
1317 delayed()->wrccr( O5_save_flags ); // Restore CCR's
1318
1319 //-----------------------
1320 // report failure:
1321 bind(fail);
1322 _verify_oop_implicit_branch[2] = pc();
1323
1324 wrccr( O5_save_flags ); // Restore CCR's
1325
1326 save_frame(align_up(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1327
1328 // stop_subroutine expects message pointer in I1.
1329 mov(I1, O1);
1330
1331 // Restore prior 64-bit registers
1332 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+0*8,I0);
1333 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+1*8,I1);
1334 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+2*8,I2);
1335 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+3*8,I3);
1336 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+4*8,I4);
1337 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+5*8,I5);
1338
1339 // factor long stop-sequence into subroutine to save space
1340 assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
1341
1342 // call indirectly to solve generation ordering problem
1343 AddressLiteral al(StubRoutines::Sparc::stop_subroutine_entry_address());
1344 load_ptr_contents(al, O5);
1345 jmpl(O5, 0, O7);
1346 delayed()->nop();
1347 }
1348
1349
1350 void MacroAssembler::stop(const char* msg) {
1351 // save frame first to get O7 for return address
1352 // add one word to size in case struct is odd number of words long
1353 // It must be doubleword-aligned for storing doubles into it.
1354
1355 save_frame(align_up(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1356
1357 // stop_subroutine expects message pointer in I1.
1358 // Size of set() should stay the same
1359 patchable_set((intptr_t)msg, O1);
1360
1361 // factor long stop-sequence into subroutine to save space
1362 assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
1363
1364 // call indirectly to solve generation ordering problem
1365 AddressLiteral a(StubRoutines::Sparc::stop_subroutine_entry_address());
1366 load_ptr_contents(a, O5);
1367 jmpl(O5, 0, O7);
1368 delayed()->nop();
1369
1370 breakpoint_trap(); // make stop actually stop rather than writing
1371 // unnoticeable results in the output files.
1372
1373 // restore(); done in callee to save space!
1374 }
1375
1376
1377 void MacroAssembler::warn(const char* msg) {
1378 save_frame(align_up(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1379 RegistersForDebugging::save_registers(this);
1380 mov(O0, L0);
1381 // Size of set() should stay the same
1382 patchable_set((intptr_t)msg, O0);
1383 call( CAST_FROM_FN_PTR(address, warning) );
1384 delayed()->nop();
1385 // ret();
1386 // delayed()->restore();
1387 RegistersForDebugging::restore_registers(this, L0);
1388 restore();
1389 }
1390
1391
1392 void MacroAssembler::untested(const char* what) {
1393 // We must be able to turn interactive prompting off
1394 // in order to run automated test scripts on the VM
1395 // Use the flag ShowMessageBoxOnError
1396
1397 const char* b = NULL;
1398 {
1399 ResourceMark rm;
1400 stringStream ss;
1401 ss.print("untested: %s", what);
1402 b = code_string(ss.as_string());
1403 }
1404 if (ShowMessageBoxOnError) { STOP(b); }
1405 else { warn(b); }
1406 }
1407
1408
1409 void MacroAssembler::unimplemented(const char* what) {
1410 const char* buf = NULL;
1411 {
1412 ResourceMark rm;
1413 stringStream ss;
1414 ss.print("unimplemented: %s", what);
1415 buf = code_string(ss.as_string());
1416 }
1417 stop(buf);
1418 }
1419
1420
1421 void MacroAssembler::stop_subroutine() {
1422 RegistersForDebugging::save_registers(this);
1423
1424 // for the sake of the debugger, stick a PC on the current frame
1425 // (this assumes that the caller has performed an extra "save")
1426 mov(I7, L7);
1427 add(O7, -7 * BytesPerInt, I7);
1428
1429 save_frame(); // one more save to free up another O7 register
1430 mov(I0, O1); // addr of reg save area
1431
1432 // We expect pointer to message in I1. Caller must set it up in O1
1433 mov(I1, O0); // get msg
1434 call (CAST_FROM_FN_PTR(address, MacroAssembler::debug), relocInfo::runtime_call_type);
1435 delayed()->nop();
1436
1437 restore();
1438
1439 RegistersForDebugging::restore_registers(this, O0);
1440
1441 save_frame(0);
1442 call(CAST_FROM_FN_PTR(address,breakpoint));
1443 delayed()->nop();
1444 restore();
1445
1446 mov(L7, I7);
1447 retl();
1448 delayed()->restore(); // see stop above
1449 }
1450
1451
1452 void MacroAssembler::debug(char* msg, RegistersForDebugging* regs) {
1453 if ( ShowMessageBoxOnError ) {
1454 JavaThread* thread = JavaThread::current();
1455 JavaThreadState saved_state = thread->thread_state();
1456 thread->set_thread_state(_thread_in_vm);
1457 {
1458 // In order to get locks work, we need to fake a in_VM state
1459 ttyLocker ttyl;
1460 ::tty->print_cr("EXECUTION STOPPED: %s\n", msg);
1461 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
1462 BytecodeCounter::print();
1463 }
1464 if (os::message_box(msg, "Execution stopped, print registers?"))
1465 regs->print(::tty);
1466 }
1467 BREAKPOINT;
1468 ThreadStateTransition::transition(JavaThread::current(), _thread_in_vm, saved_state);
1469 }
1470 else {
1471 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", msg);
1472 }
1473 assert(false, "DEBUG MESSAGE: %s", msg);
1474 }
1475
1476
1477 void MacroAssembler::calc_mem_param_words(Register Rparam_words, Register Rresult) {
1478 subcc( Rparam_words, Argument::n_register_parameters, Rresult); // how many mem words?
1479 Label no_extras;
1480 br( negative, true, pt, no_extras ); // if neg, clear reg
1481 delayed()->set(0, Rresult); // annuled, so only if taken
1482 bind( no_extras );
1483 }
1484
1485
1486 void MacroAssembler::calc_frame_size(Register Rextra_words, Register Rresult) {
1487 add(Rextra_words, frame::memory_parameter_word_sp_offset, Rresult);
1488 bclr(1, Rresult);
1489 sll(Rresult, LogBytesPerWord, Rresult); // Rresult has total frame bytes
1490 }
1491
1492
1493 void MacroAssembler::calc_frame_size_and_save(Register Rextra_words, Register Rresult) {
1494 calc_frame_size(Rextra_words, Rresult);
1495 neg(Rresult);
1496 save(SP, Rresult, SP);
1497 }
1498
1499
1500 // ---------------------------------------------------------
1501 Assembler::RCondition cond2rcond(Assembler::Condition c) {
1502 switch (c) {
1503 /*case zero: */
1504 case Assembler::equal: return Assembler::rc_z;
1505 case Assembler::lessEqual: return Assembler::rc_lez;
1506 case Assembler::less: return Assembler::rc_lz;
1507 /*case notZero:*/
1508 case Assembler::notEqual: return Assembler::rc_nz;
1509 case Assembler::greater: return Assembler::rc_gz;
1510 case Assembler::greaterEqual: return Assembler::rc_gez;
1511 }
1512 ShouldNotReachHere();
1513 return Assembler::rc_z;
1514 }
1515
1516 // compares (32 bit) register with zero and branches. NOT FOR USE WITH 64-bit POINTERS
1517 void MacroAssembler::cmp_zero_and_br(Condition c, Register s1, Label& L, bool a, Predict p) {
1518 tst(s1);
1519 br (c, a, p, L);
1520 }
1521
1522 // Compares a pointer register with zero and branches on null.
1523 // Does a test & branch on 32-bit systems and a register-branch on 64-bit.
1524 void MacroAssembler::br_null( Register s1, bool a, Predict p, Label& L ) {
1525 assert_not_delayed();
1526 bpr( rc_z, a, p, s1, L );
1527 }
1528
1529 void MacroAssembler::br_notnull( Register s1, bool a, Predict p, Label& L ) {
1530 assert_not_delayed();
1531 bpr( rc_nz, a, p, s1, L );
1532 }
1533
1534 // Compare registers and branch with nop in delay slot or cbcond without delay slot.
1535
1536 // Compare integer (32 bit) values (icc only).
1537 void MacroAssembler::cmp_and_br_short(Register s1, Register s2, Condition c,
1538 Predict p, Label& L) {
1539 assert_not_delayed();
1540 if (use_cbcond(L)) {
1541 Assembler::cbcond(c, icc, s1, s2, L);
1542 } else {
1543 cmp(s1, s2);
1544 br(c, false, p, L);
1545 delayed()->nop();
1546 }
1547 }
1548
1549 // Compare integer (32 bit) values (icc only).
1550 void MacroAssembler::cmp_and_br_short(Register s1, int simm13a, Condition c,
1551 Predict p, Label& L) {
1552 assert_not_delayed();
1553 if (is_simm(simm13a,5) && use_cbcond(L)) {
1554 Assembler::cbcond(c, icc, s1, simm13a, L);
1555 } else {
1556 cmp(s1, simm13a);
1557 br(c, false, p, L);
1558 delayed()->nop();
1559 }
1560 }
1561
1562 // Branch that tests xcc in LP64 and icc in !LP64
1563 void MacroAssembler::cmp_and_brx_short(Register s1, Register s2, Condition c,
1564 Predict p, Label& L) {
1565 assert_not_delayed();
1566 if (use_cbcond(L)) {
1567 Assembler::cbcond(c, ptr_cc, s1, s2, L);
1568 } else {
1569 cmp(s1, s2);
1570 brx(c, false, p, L);
1571 delayed()->nop();
1572 }
1573 }
1574
1575 // Branch that tests xcc in LP64 and icc in !LP64
1576 void MacroAssembler::cmp_and_brx_short(Register s1, int simm13a, Condition c,
1577 Predict p, Label& L) {
1578 assert_not_delayed();
1579 if (is_simm(simm13a,5) && use_cbcond(L)) {
1580 Assembler::cbcond(c, ptr_cc, s1, simm13a, L);
1581 } else {
1582 cmp(s1, simm13a);
1583 brx(c, false, p, L);
1584 delayed()->nop();
1585 }
1586 }
1587
1588 // Short branch version for compares a pointer with zero.
1589
1590 void MacroAssembler::br_null_short(Register s1, Predict p, Label& L) {
1591 assert_not_delayed();
1592 if (use_cbcond(L)) {
1593 Assembler::cbcond(zero, ptr_cc, s1, 0, L);
1594 } else {
1595 br_null(s1, false, p, L);
1596 delayed()->nop();
1597 }
1598 }
1599
1600 void MacroAssembler::br_notnull_short(Register s1, Predict p, Label& L) {
1601 assert_not_delayed();
1602 if (use_cbcond(L)) {
1603 Assembler::cbcond(notZero, ptr_cc, s1, 0, L);
1604 } else {
1605 br_notnull(s1, false, p, L);
1606 delayed()->nop();
1607 }
1608 }
1609
1610 // Unconditional short branch
1611 void MacroAssembler::ba_short(Label& L) {
1612 assert_not_delayed();
1613 if (use_cbcond(L)) {
1614 Assembler::cbcond(equal, icc, G0, G0, L);
1615 } else {
1616 br(always, false, pt, L);
1617 delayed()->nop();
1618 }
1619 }
1620
1621 // Branch if 'icc' says zero or not (i.e. icc.z == 1|0).
1622
1623 void MacroAssembler::br_icc_zero(bool iszero, Predict p, Label &L) {
1624 assert_not_delayed();
1625 Condition cf = (iszero ? Assembler::zero : Assembler::notZero);
1626 br(cf, false, p, L);
1627 delayed()->nop();
1628 }
1629
1630 // instruction sequences factored across compiler & interpreter
1631
1632
1633 void MacroAssembler::lcmp( Register Ra_hi, Register Ra_low,
1634 Register Rb_hi, Register Rb_low,
1635 Register Rresult) {
1636
1637 Label check_low_parts, done;
1638
1639 cmp(Ra_hi, Rb_hi ); // compare hi parts
1640 br(equal, true, pt, check_low_parts);
1641 delayed()->cmp(Ra_low, Rb_low); // test low parts
1642
1643 // And, with an unsigned comparison, it does not matter if the numbers
1644 // are negative or not.
1645 // E.g., -2 cmp -1: the low parts are 0xfffffffe and 0xffffffff.
1646 // The second one is bigger (unsignedly).
1647
1648 // Other notes: The first move in each triplet can be unconditional
1649 // (and therefore probably prefetchable).
1650 // And the equals case for the high part does not need testing,
1651 // since that triplet is reached only after finding the high halves differ.
1652
1653 mov(-1, Rresult);
1654 ba(done);
1655 delayed()->movcc(greater, false, icc, 1, Rresult);
1656
1657 bind(check_low_parts);
1658
1659 mov( -1, Rresult);
1660 movcc(equal, false, icc, 0, Rresult);
1661 movcc(greaterUnsigned, false, icc, 1, Rresult);
1662
1663 bind(done);
1664 }
1665
1666 void MacroAssembler::lneg( Register Rhi, Register Rlow ) {
1667 subcc( G0, Rlow, Rlow );
1668 subc( G0, Rhi, Rhi );
1669 }
1670
1671 void MacroAssembler::lshl( Register Rin_high, Register Rin_low,
1672 Register Rcount,
1673 Register Rout_high, Register Rout_low,
1674 Register Rtemp ) {
1675
1676
1677 Register Ralt_count = Rtemp;
1678 Register Rxfer_bits = Rtemp;
1679
1680 assert( Ralt_count != Rin_high
1681 && Ralt_count != Rin_low
1682 && Ralt_count != Rcount
1683 && Rxfer_bits != Rin_low
1684 && Rxfer_bits != Rin_high
1685 && Rxfer_bits != Rcount
1686 && Rxfer_bits != Rout_low
1687 && Rout_low != Rin_high,
1688 "register alias checks");
1689
1690 Label big_shift, done;
1691
1692 // This code can be optimized to use the 64 bit shifts in V9.
1693 // Here we use the 32 bit shifts.
1694
1695 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
1696 subcc(Rcount, 31, Ralt_count);
1697 br(greater, true, pn, big_shift);
1698 delayed()->dec(Ralt_count);
1699
1700 // shift < 32 bits, Ralt_count = Rcount-31
1701
1702 // We get the transfer bits by shifting right by 32-count the low
1703 // register. This is done by shifting right by 31-count and then by one
1704 // more to take care of the special (rare) case where count is zero
1705 // (shifting by 32 would not work).
1706
1707 neg(Ralt_count);
1708
1709 // The order of the next two instructions is critical in the case where
1710 // Rin and Rout are the same and should not be reversed.
1711
1712 srl(Rin_low, Ralt_count, Rxfer_bits); // shift right by 31-count
1713 if (Rcount != Rout_low) {
1714 sll(Rin_low, Rcount, Rout_low); // low half
1715 }
1716 sll(Rin_high, Rcount, Rout_high);
1717 if (Rcount == Rout_low) {
1718 sll(Rin_low, Rcount, Rout_low); // low half
1719 }
1720 srl(Rxfer_bits, 1, Rxfer_bits ); // shift right by one more
1721 ba(done);
1722 delayed()->or3(Rout_high, Rxfer_bits, Rout_high); // new hi value: or in shifted old hi part and xfer from low
1723
1724 // shift >= 32 bits, Ralt_count = Rcount-32
1725 bind(big_shift);
1726 sll(Rin_low, Ralt_count, Rout_high );
1727 clr(Rout_low);
1728
1729 bind(done);
1730 }
1731
1732
1733 void MacroAssembler::lshr( Register Rin_high, Register Rin_low,
1734 Register Rcount,
1735 Register Rout_high, Register Rout_low,
1736 Register Rtemp ) {
1737
1738 Register Ralt_count = Rtemp;
1739 Register Rxfer_bits = Rtemp;
1740
1741 assert( Ralt_count != Rin_high
1742 && Ralt_count != Rin_low
1743 && Ralt_count != Rcount
1744 && Rxfer_bits != Rin_low
1745 && Rxfer_bits != Rin_high
1746 && Rxfer_bits != Rcount
1747 && Rxfer_bits != Rout_high
1748 && Rout_high != Rin_low,
1749 "register alias checks");
1750
1751 Label big_shift, done;
1752
1753 // This code can be optimized to use the 64 bit shifts in V9.
1754 // Here we use the 32 bit shifts.
1755
1756 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
1757 subcc(Rcount, 31, Ralt_count);
1758 br(greater, true, pn, big_shift);
1759 delayed()->dec(Ralt_count);
1760
1761 // shift < 32 bits, Ralt_count = Rcount-31
1762
1763 // We get the transfer bits by shifting left by 32-count the high
1764 // register. This is done by shifting left by 31-count and then by one
1765 // more to take care of the special (rare) case where count is zero
1766 // (shifting by 32 would not work).
1767
1768 neg(Ralt_count);
1769 if (Rcount != Rout_low) {
1770 srl(Rin_low, Rcount, Rout_low);
1771 }
1772
1773 // The order of the next two instructions is critical in the case where
1774 // Rin and Rout are the same and should not be reversed.
1775
1776 sll(Rin_high, Ralt_count, Rxfer_bits); // shift left by 31-count
1777 sra(Rin_high, Rcount, Rout_high ); // high half
1778 sll(Rxfer_bits, 1, Rxfer_bits); // shift left by one more
1779 if (Rcount == Rout_low) {
1780 srl(Rin_low, Rcount, Rout_low);
1781 }
1782 ba(done);
1783 delayed()->or3(Rout_low, Rxfer_bits, Rout_low); // new low value: or shifted old low part and xfer from high
1784
1785 // shift >= 32 bits, Ralt_count = Rcount-32
1786 bind(big_shift);
1787
1788 sra(Rin_high, Ralt_count, Rout_low);
1789 sra(Rin_high, 31, Rout_high); // sign into hi
1790
1791 bind( done );
1792 }
1793
1794
1795
1796 void MacroAssembler::lushr( Register Rin_high, Register Rin_low,
1797 Register Rcount,
1798 Register Rout_high, Register Rout_low,
1799 Register Rtemp ) {
1800
1801 Register Ralt_count = Rtemp;
1802 Register Rxfer_bits = Rtemp;
1803
1804 assert( Ralt_count != Rin_high
1805 && Ralt_count != Rin_low
1806 && Ralt_count != Rcount
1807 && Rxfer_bits != Rin_low
1808 && Rxfer_bits != Rin_high
1809 && Rxfer_bits != Rcount
1810 && Rxfer_bits != Rout_high
1811 && Rout_high != Rin_low,
1812 "register alias checks");
1813
1814 Label big_shift, done;
1815
1816 // This code can be optimized to use the 64 bit shifts in V9.
1817 // Here we use the 32 bit shifts.
1818
1819 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
1820 subcc(Rcount, 31, Ralt_count);
1821 br(greater, true, pn, big_shift);
1822 delayed()->dec(Ralt_count);
1823
1824 // shift < 32 bits, Ralt_count = Rcount-31
1825
1826 // We get the transfer bits by shifting left by 32-count the high
1827 // register. This is done by shifting left by 31-count and then by one
1828 // more to take care of the special (rare) case where count is zero
1829 // (shifting by 32 would not work).
1830
1831 neg(Ralt_count);
1832 if (Rcount != Rout_low) {
1833 srl(Rin_low, Rcount, Rout_low);
1834 }
1835
1836 // The order of the next two instructions is critical in the case where
1837 // Rin and Rout are the same and should not be reversed.
1838
1839 sll(Rin_high, Ralt_count, Rxfer_bits); // shift left by 31-count
1840 srl(Rin_high, Rcount, Rout_high ); // high half
1841 sll(Rxfer_bits, 1, Rxfer_bits); // shift left by one more
1842 if (Rcount == Rout_low) {
1843 srl(Rin_low, Rcount, Rout_low);
1844 }
1845 ba(done);
1846 delayed()->or3(Rout_low, Rxfer_bits, Rout_low); // new low value: or shifted old low part and xfer from high
1847
1848 // shift >= 32 bits, Ralt_count = Rcount-32
1849 bind(big_shift);
1850
1851 srl(Rin_high, Ralt_count, Rout_low);
1852 clr(Rout_high);
1853
1854 bind( done );
1855 }
1856
1857 void MacroAssembler::lcmp( Register Ra, Register Rb, Register Rresult) {
1858 cmp(Ra, Rb);
1859 mov(-1, Rresult);
1860 movcc(equal, false, xcc, 0, Rresult);
1861 movcc(greater, false, xcc, 1, Rresult);
1862 }
1863
1864
1865 void MacroAssembler::load_sized_value(Address src, Register dst, size_t size_in_bytes, bool is_signed) {
1866 switch (size_in_bytes) {
1867 case 8: ld_long(src, dst); break;
1868 case 4: ld( src, dst); break;
1869 case 2: is_signed ? ldsh(src, dst) : lduh(src, dst); break;
1870 case 1: is_signed ? ldsb(src, dst) : ldub(src, dst); break;
1871 default: ShouldNotReachHere();
1872 }
1873 }
1874
1875 void MacroAssembler::store_sized_value(Register src, Address dst, size_t size_in_bytes) {
1876 switch (size_in_bytes) {
1877 case 8: st_long(src, dst); break;
1878 case 4: st( src, dst); break;
1879 case 2: sth( src, dst); break;
1880 case 1: stb( src, dst); break;
1881 default: ShouldNotReachHere();
1882 }
1883 }
1884
1885
1886 void MacroAssembler::float_cmp( bool is_float, int unordered_result,
1887 FloatRegister Fa, FloatRegister Fb,
1888 Register Rresult) {
1889 if (is_float) {
1890 fcmp(FloatRegisterImpl::S, fcc0, Fa, Fb);
1891 } else {
1892 fcmp(FloatRegisterImpl::D, fcc0, Fa, Fb);
1893 }
1894
1895 if (unordered_result == 1) {
1896 mov( -1, Rresult);
1897 movcc(f_equal, true, fcc0, 0, Rresult);
1898 movcc(f_unorderedOrGreater, true, fcc0, 1, Rresult);
1899 } else {
1900 mov( -1, Rresult);
1901 movcc(f_equal, true, fcc0, 0, Rresult);
1902 movcc(f_greater, true, fcc0, 1, Rresult);
1903 }
1904 }
1905
1906
1907 void MacroAssembler::save_all_globals_into_locals() {
1908 mov(G1,L1);
1909 mov(G2,L2);
1910 mov(G3,L3);
1911 mov(G4,L4);
1912 mov(G5,L5);
1913 mov(G6,L6);
1914 mov(G7,L7);
1915 }
1916
1917 void MacroAssembler::restore_globals_from_locals() {
1918 mov(L1,G1);
1919 mov(L2,G2);
1920 mov(L3,G3);
1921 mov(L4,G4);
1922 mov(L5,G5);
1923 mov(L6,G6);
1924 mov(L7,G7);
1925 }
1926
1927 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr,
1928 Register tmp,
1929 int offset) {
1930 intptr_t value = *delayed_value_addr;
1931 if (value != 0)
1932 return RegisterOrConstant(value + offset);
1933
1934 // load indirectly to solve generation ordering problem
1935 AddressLiteral a(delayed_value_addr);
1936 load_ptr_contents(a, tmp);
1937
1938 #ifdef ASSERT
1939 tst(tmp);
1940 breakpoint_trap(zero, xcc);
1941 #endif
1942
1943 if (offset != 0)
1944 add(tmp, offset, tmp);
1945
1946 return RegisterOrConstant(tmp);
1947 }
1948
1949
1950 RegisterOrConstant MacroAssembler::regcon_andn_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
1951 assert(d.register_or_noreg() != G0, "lost side effect");
1952 if ((s2.is_constant() && s2.as_constant() == 0) ||
1953 (s2.is_register() && s2.as_register() == G0)) {
1954 // Do nothing, just move value.
1955 if (s1.is_register()) {
1956 if (d.is_constant()) d = temp;
1957 mov(s1.as_register(), d.as_register());
1958 return d;
1959 } else {
1960 return s1;
1961 }
1962 }
1963
1964 if (s1.is_register()) {
1965 assert_different_registers(s1.as_register(), temp);
1966 if (d.is_constant()) d = temp;
1967 andn(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
1968 return d;
1969 } else {
1970 if (s2.is_register()) {
1971 assert_different_registers(s2.as_register(), temp);
1972 if (d.is_constant()) d = temp;
1973 set(s1.as_constant(), temp);
1974 andn(temp, s2.as_register(), d.as_register());
1975 return d;
1976 } else {
1977 intptr_t res = s1.as_constant() & ~s2.as_constant();
1978 return res;
1979 }
1980 }
1981 }
1982
1983 RegisterOrConstant MacroAssembler::regcon_inc_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
1984 assert(d.register_or_noreg() != G0, "lost side effect");
1985 if ((s2.is_constant() && s2.as_constant() == 0) ||
1986 (s2.is_register() && s2.as_register() == G0)) {
1987 // Do nothing, just move value.
1988 if (s1.is_register()) {
1989 if (d.is_constant()) d = temp;
1990 mov(s1.as_register(), d.as_register());
1991 return d;
1992 } else {
1993 return s1;
1994 }
1995 }
1996
1997 if (s1.is_register()) {
1998 assert_different_registers(s1.as_register(), temp);
1999 if (d.is_constant()) d = temp;
2000 add(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
2001 return d;
2002 } else {
2003 if (s2.is_register()) {
2004 assert_different_registers(s2.as_register(), temp);
2005 if (d.is_constant()) d = temp;
2006 add(s2.as_register(), ensure_simm13_or_reg(s1, temp), d.as_register());
2007 return d;
2008 } else {
2009 intptr_t res = s1.as_constant() + s2.as_constant();
2010 return res;
2011 }
2012 }
2013 }
2014
2015 RegisterOrConstant MacroAssembler::regcon_sll_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
2016 assert(d.register_or_noreg() != G0, "lost side effect");
2017 if (!is_simm13(s2.constant_or_zero()))
2018 s2 = (s2.as_constant() & 0xFF);
2019 if ((s2.is_constant() && s2.as_constant() == 0) ||
2020 (s2.is_register() && s2.as_register() == G0)) {
2021 // Do nothing, just move value.
2022 if (s1.is_register()) {
2023 if (d.is_constant()) d = temp;
2024 mov(s1.as_register(), d.as_register());
2025 return d;
2026 } else {
2027 return s1;
2028 }
2029 }
2030
2031 if (s1.is_register()) {
2032 assert_different_registers(s1.as_register(), temp);
2033 if (d.is_constant()) d = temp;
2034 sll_ptr(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
2035 return d;
2036 } else {
2037 if (s2.is_register()) {
2038 assert_different_registers(s2.as_register(), temp);
2039 if (d.is_constant()) d = temp;
2040 set(s1.as_constant(), temp);
2041 sll_ptr(temp, s2.as_register(), d.as_register());
2042 return d;
2043 } else {
2044 intptr_t res = s1.as_constant() << s2.as_constant();
2045 return res;
2046 }
2047 }
2048 }
2049
2050
2051 // Look up the method for a megamorphic invokeinterface call.
2052 // The target method is determined by <intf_klass, itable_index>.
2053 // The receiver klass is in recv_klass.
2054 // On success, the result will be in method_result, and execution falls through.
2055 // On failure, execution transfers to the given label.
2056 void MacroAssembler::lookup_interface_method(Register recv_klass,
2057 Register intf_klass,
2058 RegisterOrConstant itable_index,
2059 Register method_result,
2060 Register scan_temp,
2061 Register sethi_temp,
2062 Label& L_no_such_interface,
2063 bool return_method) {
2064 assert_different_registers(recv_klass, intf_klass, method_result, scan_temp);
2065 assert(!return_method || itable_index.is_constant() || itable_index.as_register() == method_result,
2066 "caller must use same register for non-constant itable index as for method");
2067
2068 Label L_no_such_interface_restore;
2069 bool did_save = false;
2070 if (scan_temp == noreg || sethi_temp == noreg) {
2071 Register recv_2 = recv_klass->is_global() ? recv_klass : L0;
2072 Register intf_2 = intf_klass->is_global() ? intf_klass : L1;
2073 assert(method_result->is_global(), "must be able to return value");
2074 scan_temp = L2;
2075 sethi_temp = L3;
2076 save_frame_and_mov(0, recv_klass, recv_2, intf_klass, intf_2);
2077 recv_klass = recv_2;
2078 intf_klass = intf_2;
2079 did_save = true;
2080 }
2081
2082 // Compute start of first itableOffsetEntry (which is at the end of the vtable)
2083 int vtable_base = in_bytes(Klass::vtable_start_offset());
2084 int scan_step = itableOffsetEntry::size() * wordSize;
2085 int vte_size = vtableEntry::size_in_bytes();
2086
2087 lduw(recv_klass, in_bytes(Klass::vtable_length_offset()), scan_temp);
2088 // %%% We should store the aligned, prescaled offset in the klassoop.
2089 // Then the next several instructions would fold away.
2090
2091 int itb_offset = vtable_base;
2092 int itb_scale = exact_log2(vtableEntry::size_in_bytes());
2093 sll(scan_temp, itb_scale, scan_temp);
2094 add(scan_temp, itb_offset, scan_temp);
2095 add(recv_klass, scan_temp, scan_temp);
2096
2097 if (return_method) {
2098 // Adjust recv_klass by scaled itable_index, so we can free itable_index.
2099 RegisterOrConstant itable_offset = itable_index;
2100 itable_offset = regcon_sll_ptr(itable_index, exact_log2(itableMethodEntry::size() * wordSize), itable_offset);
2101 itable_offset = regcon_inc_ptr(itable_offset, itableMethodEntry::method_offset_in_bytes(), itable_offset);
2102 add(recv_klass, ensure_simm13_or_reg(itable_offset, sethi_temp), recv_klass);
2103 }
2104
2105 // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) {
2106 // if (scan->interface() == intf) {
2107 // result = (klass + scan->offset() + itable_index);
2108 // }
2109 // }
2110 Label L_search, L_found_method;
2111
2112 for (int peel = 1; peel >= 0; peel--) {
2113 // %%%% Could load both offset and interface in one ldx, if they were
2114 // in the opposite order. This would save a load.
2115 ld_ptr(scan_temp, itableOffsetEntry::interface_offset_in_bytes(), method_result);
2116
2117 // Check that this entry is non-null. A null entry means that
2118 // the receiver class doesn't implement the interface, and wasn't the
2119 // same as when the caller was compiled.
2120 bpr(Assembler::rc_z, false, Assembler::pn, method_result, did_save ? L_no_such_interface_restore : L_no_such_interface);
2121 delayed()->cmp(method_result, intf_klass);
2122
2123 if (peel) {
2124 brx(Assembler::equal, false, Assembler::pt, L_found_method);
2125 } else {
2126 brx(Assembler::notEqual, false, Assembler::pn, L_search);
2127 // (invert the test to fall through to found_method...)
2128 }
2129 delayed()->add(scan_temp, scan_step, scan_temp);
2130
2131 if (!peel) break;
2132
2133 bind(L_search);
2134 }
2135
2136 bind(L_found_method);
2137
2138 if (return_method) {
2139 // Got a hit.
2140 int ito_offset = itableOffsetEntry::offset_offset_in_bytes();
2141 // scan_temp[-scan_step] points to the vtable offset we need
2142 ito_offset -= scan_step;
2143 lduw(scan_temp, ito_offset, scan_temp);
2144 ld_ptr(recv_klass, scan_temp, method_result);
2145 }
2146
2147 if (did_save) {
2148 Label L_done;
2149 ba(L_done);
2150 delayed()->restore();
2151
2152 bind(L_no_such_interface_restore);
2153 ba(L_no_such_interface);
2154 delayed()->restore();
2155
2156 bind(L_done);
2157 }
2158 }
2159
2160
2161 // virtual method calling
2162 void MacroAssembler::lookup_virtual_method(Register recv_klass,
2163 RegisterOrConstant vtable_index,
2164 Register method_result) {
2165 assert_different_registers(recv_klass, method_result, vtable_index.register_or_noreg());
2166 Register sethi_temp = method_result;
2167 const int base = in_bytes(Klass::vtable_start_offset()) +
2168 // method pointer offset within the vtable entry:
2169 vtableEntry::method_offset_in_bytes();
2170 RegisterOrConstant vtable_offset = vtable_index;
2171 // Each of the following three lines potentially generates an instruction.
2172 // But the total number of address formation instructions will always be
2173 // at most two, and will often be zero. In any case, it will be optimal.
2174 // If vtable_index is a register, we will have (sll_ptr N,x; inc_ptr B,x; ld_ptr k,x).
2175 // If vtable_index is a constant, we will have at most (set B+X<<N,t; ld_ptr k,t).
2176 vtable_offset = regcon_sll_ptr(vtable_index, exact_log2(vtableEntry::size_in_bytes()), vtable_offset);
2177 vtable_offset = regcon_inc_ptr(vtable_offset, base, vtable_offset, sethi_temp);
2178 Address vtable_entry_addr(recv_klass, ensure_simm13_or_reg(vtable_offset, sethi_temp));
2179 ld_ptr(vtable_entry_addr, method_result);
2180 }
2181
2182
2183 void MacroAssembler::check_klass_subtype(Register sub_klass,
2184 Register super_klass,
2185 Register temp_reg,
2186 Register temp2_reg,
2187 Label& L_success) {
2188 Register sub_2 = sub_klass;
2189 Register sup_2 = super_klass;
2190 if (!sub_2->is_global()) sub_2 = L0;
2191 if (!sup_2->is_global()) sup_2 = L1;
2192 bool did_save = false;
2193 if (temp_reg == noreg || temp2_reg == noreg) {
2194 temp_reg = L2;
2195 temp2_reg = L3;
2196 save_frame_and_mov(0, sub_klass, sub_2, super_klass, sup_2);
2197 sub_klass = sub_2;
2198 super_klass = sup_2;
2199 did_save = true;
2200 }
2201 Label L_failure, L_pop_to_failure, L_pop_to_success;
2202 check_klass_subtype_fast_path(sub_klass, super_klass,
2203 temp_reg, temp2_reg,
2204 (did_save ? &L_pop_to_success : &L_success),
2205 (did_save ? &L_pop_to_failure : &L_failure), NULL);
2206
2207 if (!did_save)
2208 save_frame_and_mov(0, sub_klass, sub_2, super_klass, sup_2);
2209 check_klass_subtype_slow_path(sub_2, sup_2,
2210 L2, L3, L4, L5,
2211 NULL, &L_pop_to_failure);
2212
2213 // on success:
2214 bind(L_pop_to_success);
2215 restore();
2216 ba_short(L_success);
2217
2218 // on failure:
2219 bind(L_pop_to_failure);
2220 restore();
2221 bind(L_failure);
2222 }
2223
2224
2225 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass,
2226 Register super_klass,
2227 Register temp_reg,
2228 Register temp2_reg,
2229 Label* L_success,
2230 Label* L_failure,
2231 Label* L_slow_path,
2232 RegisterOrConstant super_check_offset) {
2233 int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
2234 int sco_offset = in_bytes(Klass::super_check_offset_offset());
2235
2236 bool must_load_sco = (super_check_offset.constant_or_zero() == -1);
2237 bool need_slow_path = (must_load_sco ||
2238 super_check_offset.constant_or_zero() == sco_offset);
2239
2240 assert_different_registers(sub_klass, super_klass, temp_reg);
2241 if (super_check_offset.is_register()) {
2242 assert_different_registers(sub_klass, super_klass, temp_reg,
2243 super_check_offset.as_register());
2244 } else if (must_load_sco) {
2245 assert(temp2_reg != noreg, "supply either a temp or a register offset");
2246 }
2247
2248 Label L_fallthrough;
2249 int label_nulls = 0;
2250 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
2251 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
2252 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; }
2253 assert(label_nulls <= 1 ||
2254 (L_slow_path == &L_fallthrough && label_nulls <= 2 && !need_slow_path),
2255 "at most one NULL in the batch, usually");
2256
2257 // If the pointers are equal, we are done (e.g., String[] elements).
2258 // This self-check enables sharing of secondary supertype arrays among
2259 // non-primary types such as array-of-interface. Otherwise, each such
2260 // type would need its own customized SSA.
2261 // We move this check to the front of the fast path because many
2262 // type checks are in fact trivially successful in this manner,
2263 // so we get a nicely predicted branch right at the start of the check.
2264 cmp(super_klass, sub_klass);
2265 brx(Assembler::equal, false, Assembler::pn, *L_success);
2266 delayed()->nop();
2267
2268 // Check the supertype display:
2269 if (must_load_sco) {
2270 // The super check offset is always positive...
2271 lduw(super_klass, sco_offset, temp2_reg);
2272 super_check_offset = RegisterOrConstant(temp2_reg);
2273 // super_check_offset is register.
2274 assert_different_registers(sub_klass, super_klass, temp_reg, super_check_offset.as_register());
2275 }
2276 ld_ptr(sub_klass, super_check_offset, temp_reg);
2277 cmp(super_klass, temp_reg);
2278
2279 // This check has worked decisively for primary supers.
2280 // Secondary supers are sought in the super_cache ('super_cache_addr').
2281 // (Secondary supers are interfaces and very deeply nested subtypes.)
2282 // This works in the same check above because of a tricky aliasing
2283 // between the super_cache and the primary super display elements.
2284 // (The 'super_check_addr' can address either, as the case requires.)
2285 // Note that the cache is updated below if it does not help us find
2286 // what we need immediately.
2287 // So if it was a primary super, we can just fail immediately.
2288 // Otherwise, it's the slow path for us (no success at this point).
2289
2290 // Hacked ba(), which may only be used just before L_fallthrough.
2291 #define FINAL_JUMP(label) \
2292 if (&(label) != &L_fallthrough) { \
2293 ba(label); delayed()->nop(); \
2294 }
2295
2296 if (super_check_offset.is_register()) {
2297 brx(Assembler::equal, false, Assembler::pn, *L_success);
2298 delayed()->cmp(super_check_offset.as_register(), sc_offset);
2299
2300 if (L_failure == &L_fallthrough) {
2301 brx(Assembler::equal, false, Assembler::pt, *L_slow_path);
2302 delayed()->nop();
2303 } else {
2304 brx(Assembler::notEqual, false, Assembler::pn, *L_failure);
2305 delayed()->nop();
2306 FINAL_JUMP(*L_slow_path);
2307 }
2308 } else if (super_check_offset.as_constant() == sc_offset) {
2309 // Need a slow path; fast failure is impossible.
2310 if (L_slow_path == &L_fallthrough) {
2311 brx(Assembler::equal, false, Assembler::pt, *L_success);
2312 delayed()->nop();
2313 } else {
2314 brx(Assembler::notEqual, false, Assembler::pn, *L_slow_path);
2315 delayed()->nop();
2316 FINAL_JUMP(*L_success);
2317 }
2318 } else {
2319 // No slow path; it's a fast decision.
2320 if (L_failure == &L_fallthrough) {
2321 brx(Assembler::equal, false, Assembler::pt, *L_success);
2322 delayed()->nop();
2323 } else {
2324 brx(Assembler::notEqual, false, Assembler::pn, *L_failure);
2325 delayed()->nop();
2326 FINAL_JUMP(*L_success);
2327 }
2328 }
2329
2330 bind(L_fallthrough);
2331
2332 #undef FINAL_JUMP
2333 }
2334
2335
2336 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass,
2337 Register super_klass,
2338 Register count_temp,
2339 Register scan_temp,
2340 Register scratch_reg,
2341 Register coop_reg,
2342 Label* L_success,
2343 Label* L_failure) {
2344 assert_different_registers(sub_klass, super_klass,
2345 count_temp, scan_temp, scratch_reg, coop_reg);
2346
2347 Label L_fallthrough, L_loop;
2348 int label_nulls = 0;
2349 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
2350 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
2351 assert(label_nulls <= 1, "at most one NULL in the batch");
2352
2353 // a couple of useful fields in sub_klass:
2354 int ss_offset = in_bytes(Klass::secondary_supers_offset());
2355 int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
2356
2357 // Do a linear scan of the secondary super-klass chain.
2358 // This code is rarely used, so simplicity is a virtue here.
2359
2360 #ifndef PRODUCT
2361 int* pst_counter = &SharedRuntime::_partial_subtype_ctr;
2362 inc_counter((address) pst_counter, count_temp, scan_temp);
2363 #endif
2364
2365 // We will consult the secondary-super array.
2366 ld_ptr(sub_klass, ss_offset, scan_temp);
2367
2368 Register search_key = super_klass;
2369
2370 // Load the array length. (Positive movl does right thing on LP64.)
2371 lduw(scan_temp, Array<Klass*>::length_offset_in_bytes(), count_temp);
2372
2373 // Check for empty secondary super list
2374 tst(count_temp);
2375
2376 // In the array of super classes elements are pointer sized.
2377 int element_size = wordSize;
2378
2379 // Top of search loop
2380 bind(L_loop);
2381 br(Assembler::equal, false, Assembler::pn, *L_failure);
2382 delayed()->add(scan_temp, element_size, scan_temp);
2383
2384 // Skip the array header in all array accesses.
2385 int elem_offset = Array<Klass*>::base_offset_in_bytes();
2386 elem_offset -= element_size; // the scan pointer was pre-incremented also
2387
2388 // Load next super to check
2389 ld_ptr( scan_temp, elem_offset, scratch_reg );
2390
2391 // Look for Rsuper_klass on Rsub_klass's secondary super-class-overflow list
2392 cmp(scratch_reg, search_key);
2393
2394 // A miss means we are NOT a subtype and need to keep looping
2395 brx(Assembler::notEqual, false, Assembler::pn, L_loop);
2396 delayed()->deccc(count_temp); // decrement trip counter in delay slot
2397
2398 // Success. Cache the super we found and proceed in triumph.
2399 st_ptr(super_klass, sub_klass, sc_offset);
2400
2401 if (L_success != &L_fallthrough) {
2402 ba(*L_success);
2403 delayed()->nop();
2404 }
2405
2406 bind(L_fallthrough);
2407 }
2408
2409
2410 RegisterOrConstant MacroAssembler::argument_offset(RegisterOrConstant arg_slot,
2411 Register temp_reg,
2412 int extra_slot_offset) {
2413 // cf. TemplateTable::prepare_invoke(), if (load_receiver).
2414 int stackElementSize = Interpreter::stackElementSize;
2415 int offset = extra_slot_offset * stackElementSize;
2416 if (arg_slot.is_constant()) {
2417 offset += arg_slot.as_constant() * stackElementSize;
2418 return offset;
2419 } else {
2420 assert(temp_reg != noreg, "must specify");
2421 sll_ptr(arg_slot.as_register(), exact_log2(stackElementSize), temp_reg);
2422 if (offset != 0)
2423 add(temp_reg, offset, temp_reg);
2424 return temp_reg;
2425 }
2426 }
2427
2428
2429 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
2430 Register temp_reg,
2431 int extra_slot_offset) {
2432 return Address(Gargs, argument_offset(arg_slot, temp_reg, extra_slot_offset));
2433 }
2434
2435
2436 void MacroAssembler::biased_locking_enter(Register obj_reg, Register mark_reg,
2437 Register temp_reg,
2438 Label& done, Label* slow_case,
2439 BiasedLockingCounters* counters) {
2440 assert(UseBiasedLocking, "why call this otherwise?");
2441
2442 if (PrintBiasedLockingStatistics) {
2443 assert_different_registers(obj_reg, mark_reg, temp_reg, O7);
2444 if (counters == NULL)
2445 counters = BiasedLocking::counters();
2446 }
2447
2448 Label cas_label;
2449
2450 // Biased locking
2451 // See whether the lock is currently biased toward our thread and
2452 // whether the epoch is still valid
2453 // Note that the runtime guarantees sufficient alignment of JavaThread
2454 // pointers to allow age to be placed into low bits
2455 assert(markWord::age_shift == markWord::lock_bits + markWord::biased_lock_bits, "biased locking makes assumptions about bit layout");
2456 and3(mark_reg, markWord::biased_lock_mask_in_place, temp_reg);
2457 cmp_and_brx_short(temp_reg, markWord::biased_lock_pattern, Assembler::notEqual, Assembler::pn, cas_label);
2458
2459 load_klass(obj_reg, temp_reg);
2460 ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
2461 or3(G2_thread, temp_reg, temp_reg);
2462 xor3(mark_reg, temp_reg, temp_reg);
2463 andcc(temp_reg, ~((int) markWord::age_mask_in_place), temp_reg);
2464 if (counters != NULL) {
2465 cond_inc(Assembler::equal, (address) counters->biased_lock_entry_count_addr(), mark_reg, temp_reg);
2466 // Reload mark_reg as we may need it later
2467 ld_ptr(Address(obj_reg, oopDesc::mark_offset_in_bytes()), mark_reg);
2468 }
2469 brx(Assembler::equal, true, Assembler::pt, done);
2470 delayed()->nop();
2471
2472 Label try_revoke_bias;
2473 Label try_rebias;
2474 Address mark_addr = Address(obj_reg, oopDesc::mark_offset_in_bytes());
2475 assert(mark_addr.disp() == 0, "cas must take a zero displacement");
2476
2477 // At this point we know that the header has the bias pattern and
2478 // that we are not the bias owner in the current epoch. We need to
2479 // figure out more details about the state of the header in order to
2480 // know what operations can be legally performed on the object's
2481 // header.
2482
2483 // If the low three bits in the xor result aren't clear, that means
2484 // the prototype header is no longer biased and we have to revoke
2485 // the bias on this object.
2486 btst(markWord::biased_lock_mask_in_place, temp_reg);
2487 brx(Assembler::notZero, false, Assembler::pn, try_revoke_bias);
2488
2489 // Biasing is still enabled for this data type. See whether the
2490 // epoch of the current bias is still valid, meaning that the epoch
2491 // bits of the mark word are equal to the epoch bits of the
2492 // prototype header. (Note that the prototype header's epoch bits
2493 // only change at a safepoint.) If not, attempt to rebias the object
2494 // toward the current thread. Note that we must be absolutely sure
2495 // that the current epoch is invalid in order to do this because
2496 // otherwise the manipulations it performs on the mark word are
2497 // illegal.
2498 delayed()->btst(markWord::epoch_mask_in_place, temp_reg);
2499 brx(Assembler::notZero, false, Assembler::pn, try_rebias);
2500
2501 // The epoch of the current bias is still valid but we know nothing
2502 // about the owner; it might be set or it might be clear. Try to
2503 // acquire the bias of the object using an atomic operation. If this
2504 // fails we will go in to the runtime to revoke the object's bias.
2505 // Note that we first construct the presumed unbiased header so we
2506 // don't accidentally blow away another thread's valid bias.
2507 delayed()->and3(mark_reg,
2508 markWord::biased_lock_mask_in_place | markWord::age_mask_in_place | markWord::epoch_mask_in_place,
2509 mark_reg);
2510 or3(G2_thread, mark_reg, temp_reg);
2511 cas_ptr(mark_addr.base(), mark_reg, temp_reg);
2512 // If the biasing toward our thread failed, this means that
2513 // another thread succeeded in biasing it toward itself and we
2514 // need to revoke that bias. The revocation will occur in the
2515 // interpreter runtime in the slow case.
2516 cmp(mark_reg, temp_reg);
2517 if (counters != NULL) {
2518 cond_inc(Assembler::zero, (address) counters->anonymously_biased_lock_entry_count_addr(), mark_reg, temp_reg);
2519 }
2520 if (slow_case != NULL) {
2521 brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
2522 delayed()->nop();
2523 }
2524 ba_short(done);
2525
2526 bind(try_rebias);
2527 // At this point we know the epoch has expired, meaning that the
2528 // current "bias owner", if any, is actually invalid. Under these
2529 // circumstances _only_, we are allowed to use the current header's
2530 // value as the comparison value when doing the cas to acquire the
2531 // bias in the current epoch. In other words, we allow transfer of
2532 // the bias from one thread to another directly in this situation.
2533 //
2534 // FIXME: due to a lack of registers we currently blow away the age
2535 // bits in this situation. Should attempt to preserve them.
2536 load_klass(obj_reg, temp_reg);
2537 ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
2538 or3(G2_thread, temp_reg, temp_reg);
2539 cas_ptr(mark_addr.base(), mark_reg, temp_reg);
2540 // If the biasing toward our thread failed, this means that
2541 // another thread succeeded in biasing it toward itself and we
2542 // need to revoke that bias. The revocation will occur in the
2543 // interpreter runtime in the slow case.
2544 cmp(mark_reg, temp_reg);
2545 if (counters != NULL) {
2546 cond_inc(Assembler::zero, (address) counters->rebiased_lock_entry_count_addr(), mark_reg, temp_reg);
2547 }
2548 if (slow_case != NULL) {
2549 brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
2550 delayed()->nop();
2551 }
2552 ba_short(done);
2553
2554 bind(try_revoke_bias);
2555 // The prototype mark in the klass doesn't have the bias bit set any
2556 // more, indicating that objects of this data type are not supposed
2557 // to be biased any more. We are going to try to reset the mark of
2558 // this object to the prototype value and fall through to the
2559 // CAS-based locking scheme. Note that if our CAS fails, it means
2560 // that another thread raced us for the privilege of revoking the
2561 // bias of this particular object, so it's okay to continue in the
2562 // normal locking code.
2563 //
2564 // FIXME: due to a lack of registers we currently blow away the age
2565 // bits in this situation. Should attempt to preserve them.
2566 load_klass(obj_reg, temp_reg);
2567 ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
2568 cas_ptr(mark_addr.base(), mark_reg, temp_reg);
2569 // Fall through to the normal CAS-based lock, because no matter what
2570 // the result of the above CAS, some thread must have succeeded in
2571 // removing the bias bit from the object's header.
2572 if (counters != NULL) {
2573 cmp(mark_reg, temp_reg);
2574 cond_inc(Assembler::zero, (address) counters->revoked_lock_entry_count_addr(), mark_reg, temp_reg);
2575 }
2576
2577 bind(cas_label);
2578 }
2579
2580 void MacroAssembler::biased_locking_exit (Address mark_addr, Register temp_reg, Label& done,
2581 bool allow_delay_slot_filling) {
2582 // Check for biased locking unlock case, which is a no-op
2583 // Note: we do not have to check the thread ID for two reasons.
2584 // First, the interpreter checks for IllegalMonitorStateException at
2585 // a higher level. Second, if the bias was revoked while we held the
2586 // lock, the object could not be rebiased toward another thread, so
2587 // the bias bit would be clear.
2588 ld_ptr(mark_addr, temp_reg);
2589 and3(temp_reg, markWord::biased_lock_mask_in_place, temp_reg);
2590 cmp(temp_reg, markWord::biased_lock_pattern);
2591 brx(Assembler::equal, allow_delay_slot_filling, Assembler::pt, done);
2592 delayed();
2593 if (!allow_delay_slot_filling) {
2594 nop();
2595 }
2596 }
2597
2598
2599 // compiler_lock_object() and compiler_unlock_object() are direct transliterations
2600 // of i486.ad fast_lock() and fast_unlock(). See those methods for detailed comments.
2601 // The code could be tightened up considerably.
2602 //
2603 // box->dhw disposition - post-conditions at DONE_LABEL.
2604 // - Successful inflated lock: box->dhw != 0.
2605 // Any non-zero value suffices.
2606 // Consider G2_thread, rsp, boxReg, or markWord::unused_mark()
2607 // - Successful Stack-lock: box->dhw == mark.
2608 // box->dhw must contain the displaced mark word value
2609 // - Failure -- icc.ZFlag == 0 and box->dhw is undefined.
2610 // The slow-path enter() is responsible for setting
2611 // box->dhw = NonZero (typically markWord::unused_mark()).
2612 // - Biased: box->dhw is undefined
2613 //
2614 // SPARC refworkload performance - specifically jetstream and scimark - are
2615 // extremely sensitive to the size of the code emitted by compiler_lock_object
2616 // and compiler_unlock_object. Critically, the key factor is code size, not path
2617 // length. (Simply experiments to pad CLO with unexecuted NOPs demonstrte the
2618 // effect).
2619
2620
2621 void MacroAssembler::compiler_lock_object(Register Roop, Register Rmark,
2622 Register Rbox, Register Rscratch,
2623 BiasedLockingCounters* counters,
2624 bool try_bias) {
2625 Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
2626
2627 verify_oop(Roop);
2628 Label done ;
2629
2630 if (counters != NULL) {
2631 inc_counter((address) counters->total_entry_count_addr(), Rmark, Rscratch);
2632 }
2633
2634 // Aggressively avoid the Store-before-CAS penalty
2635 // Defer the store into box->dhw until after the CAS
2636 Label IsInflated, Recursive ;
2637
2638 // Anticipate CAS -- Avoid RTS->RTO upgrade
2639 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads);
2640
2641 ld_ptr(mark_addr, Rmark); // fetch obj->mark
2642 // Triage: biased, stack-locked, neutral, inflated
2643
2644 if (try_bias) {
2645 biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
2646 // Invariant: if control reaches this point in the emitted stream
2647 // then Rmark has not been modified.
2648 }
2649 andcc(Rmark, 2, G0);
2650 brx(Assembler::notZero, false, Assembler::pn, IsInflated);
2651 delayed()-> // Beware - dangling delay-slot
2652
2653 // Try stack-lock acquisition.
2654 // Transiently install BUSY (0) encoding in the mark word.
2655 // if the CAS of 0 into the mark was successful then we execute:
2656 // ST box->dhw = mark -- save fetched mark in on-stack basiclock box
2657 // ST obj->mark = box -- overwrite transient 0 value
2658 // This presumes TSO, of course.
2659
2660 mov(0, Rscratch);
2661 or3(Rmark, markWord::unlocked_value, Rmark);
2662 assert(mark_addr.disp() == 0, "cas must take a zero displacement");
2663 cas_ptr(mark_addr.base(), Rmark, Rscratch);
2664 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads);
2665 cmp(Rscratch, Rmark);
2666 brx(Assembler::notZero, false, Assembler::pn, Recursive);
2667 delayed()->st_ptr(Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
2668 if (counters != NULL) {
2669 cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
2670 }
2671 ba(done);
2672 delayed()->st_ptr(Rbox, mark_addr);
2673
2674 bind(Recursive);
2675 // Stack-lock attempt failed - check for recursive stack-lock.
2676 // Tests show that we can remove the recursive case with no impact
2677 // on refworkload 0.83. If we need to reduce the size of the code
2678 // emitted by compiler_lock_object() the recursive case is perfect
2679 // candidate.
2680 //
2681 // A more extreme idea is to always inflate on stack-lock recursion.
2682 // This lets us eliminate the recursive checks in compiler_lock_object
2683 // and compiler_unlock_object and the (box->dhw == 0) encoding.
2684 // A brief experiment - requiring changes to synchronizer.cpp, interpreter,
2685 // and showed a performance *increase*. In the same experiment I eliminated
2686 // the fast-path stack-lock code from the interpreter and always passed
2687 // control to the "slow" operators in synchronizer.cpp.
2688
2689 // RScratch contains the fetched obj->mark value from the failed CAS.
2690 sub(Rscratch, STACK_BIAS, Rscratch);
2691 sub(Rscratch, SP, Rscratch);
2692 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
2693 andcc(Rscratch, 0xfffff003, Rscratch);
2694 if (counters != NULL) {
2695 // Accounting needs the Rscratch register
2696 st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
2697 cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
2698 ba_short(done);
2699 } else {
2700 ba(done);
2701 delayed()->st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
2702 }
2703
2704 bind (IsInflated);
2705
2706 // Try to CAS m->owner from null to Self
2707 // Invariant: if we acquire the lock then _recursions should be 0.
2708 add(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), Rmark);
2709 mov(G2_thread, Rscratch);
2710 cas_ptr(Rmark, G0, Rscratch);
2711 andcc(Rscratch, Rscratch, G0); // set ICCs for done: icc.zf iff success
2712 // set icc.zf : 1=success 0=failure
2713 // ST box->displaced_header = NonZero.
2714 // Any non-zero value suffices:
2715 // markWord::unused_mark(), G2_thread, RBox, RScratch, rsp, etc.
2716 st_ptr(Rbox, Rbox, BasicLock::displaced_header_offset_in_bytes());
2717 // Intentional fall-through into done
2718
2719 bind (done);
2720 }
2721
2722 void MacroAssembler::compiler_unlock_object(Register Roop, Register Rmark,
2723 Register Rbox, Register Rscratch,
2724 bool try_bias) {
2725 Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
2726
2727 Label done ;
2728
2729 // Beware ... If the aggregate size of the code emitted by CLO and CUO is
2730 // is too large performance rolls abruptly off a cliff.
2731 // This could be related to inlining policies, code cache management, or
2732 // I$ effects.
2733 Label LStacked ;
2734
2735 if (try_bias) {
2736 // TODO: eliminate redundant LDs of obj->mark
2737 biased_locking_exit(mark_addr, Rscratch, done);
2738 }
2739
2740 ld_ptr(Roop, oopDesc::mark_offset_in_bytes(), Rmark);
2741 ld_ptr(Rbox, BasicLock::displaced_header_offset_in_bytes(), Rscratch);
2742 andcc(Rscratch, Rscratch, G0);
2743 brx(Assembler::zero, false, Assembler::pn, done);
2744 delayed()->nop(); // consider: relocate fetch of mark, above, into this DS
2745 andcc(Rmark, 2, G0);
2746 brx(Assembler::zero, false, Assembler::pt, LStacked);
2747 delayed()->nop();
2748
2749 // It's inflated
2750 // Conceptually we need a #loadstore|#storestore "release" MEMBAR before
2751 // the ST of 0 into _owner which releases the lock. This prevents loads
2752 // and stores within the critical section from reordering (floating)
2753 // past the store that releases the lock. But TSO is a strong memory model
2754 // and that particular flavor of barrier is a noop, so we can safely elide it.
2755 // Note that we use 1-0 locking by default for the inflated case. We
2756 // close the resultant (and rare) race by having contended threads in
2757 // monitorenter periodically poll _owner.
2758
2759 // 1-0 form : avoids CAS and MEMBAR in the common case
2760 // Do not bother to ratify that m->Owner == Self.
2761 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions)), Rbox);
2762 orcc(Rbox, G0, G0);
2763 brx(Assembler::notZero, false, Assembler::pn, done);
2764 delayed()->
2765 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(EntryList)), Rscratch);
2766 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(cxq)), Rbox);
2767 orcc(Rbox, Rscratch, G0);
2768 brx(Assembler::zero, false, Assembler::pt, done);
2769 delayed()->
2770 st_ptr(G0, Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)));
2771
2772 membar(StoreLoad);
2773 // Check that _succ is (or remains) non-zero
2774 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(succ)), Rscratch);
2775 andcc(Rscratch, Rscratch, G0);
2776 brx(Assembler::notZero, false, Assembler::pt, done);
2777 delayed()->andcc(G0, G0, G0);
2778 add(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), Rmark);
2779 mov(G2_thread, Rscratch);
2780 cas_ptr(Rmark, G0, Rscratch);
2781 cmp(Rscratch, G0);
2782 // invert icc.zf and goto done
2783 // A slightly better v8+/v9 idiom would be the following:
2784 // movrnz Rscratch,1,Rscratch
2785 // ba done
2786 // xorcc Rscratch,1,G0
2787 // In v8+ mode the idiom would be valid IFF Rscratch was a G or O register
2788 brx(Assembler::notZero, false, Assembler::pt, done);
2789 delayed()->cmp(G0, G0);
2790 br(Assembler::always, false, Assembler::pt, done);
2791 delayed()->cmp(G0, 1);
2792
2793 bind (LStacked);
2794 // Consider: we could replace the expensive CAS in the exit
2795 // path with a simple ST of the displaced mark value fetched from
2796 // the on-stack basiclock box. That admits a race where a thread T2
2797 // in the slow lock path -- inflating with monitor M -- could race a
2798 // thread T1 in the fast unlock path, resulting in a missed wakeup for T2.
2799 // More precisely T1 in the stack-lock unlock path could "stomp" the
2800 // inflated mark value M installed by T2, resulting in an orphan
2801 // object monitor M and T2 becoming stranded. We can remedy that situation
2802 // by having T2 periodically poll the object's mark word using timed wait
2803 // operations. If T2 discovers that a stomp has occurred it vacates
2804 // the monitor M and wakes any other threads stranded on the now-orphan M.
2805 // In addition the monitor scavenger, which performs deflation,
2806 // would also need to check for orpan monitors and stranded threads.
2807 //
2808 // Finally, inflation is also used when T2 needs to assign a hashCode
2809 // to O and O is stack-locked by T1. The "stomp" race could cause
2810 // an assigned hashCode value to be lost. We can avoid that condition
2811 // and provide the necessary hashCode stability invariants by ensuring
2812 // that hashCode generation is idempotent between copying GCs.
2813 // For example we could compute the hashCode of an object O as
2814 // O's heap address XOR some high quality RNG value that is refreshed
2815 // at GC-time. The monitor scavenger would install the hashCode
2816 // found in any orphan monitors. Again, the mechanism admits a
2817 // lost-update "stomp" WAW race but detects and recovers as needed.
2818 //
2819 // A prototype implementation showed excellent results, although
2820 // the scavenger and timeout code was rather involved.
2821
2822 cas_ptr(mark_addr.base(), Rbox, Rscratch);
2823 cmp(Rbox, Rscratch);
2824 // Intentional fall through into done ...
2825
2826 bind(done);
2827 }
2828
2829
2830
2831 void MacroAssembler::print_CPU_state() {
2832 // %%%%% need to implement this
2833 }
2834
2835 void MacroAssembler::verify_FPU(int stack_depth, const char* s) {
2836 // %%%%% need to implement this
2837 }
2838
2839 void MacroAssembler::push_IU_state() {
2840 // %%%%% need to implement this
2841 }
2842
2843
2844 void MacroAssembler::pop_IU_state() {
2845 // %%%%% need to implement this
2846 }
2847
2848
2849 void MacroAssembler::push_FPU_state() {
2850 // %%%%% need to implement this
2851 }
2852
2853
2854 void MacroAssembler::pop_FPU_state() {
2855 // %%%%% need to implement this
2856 }
2857
2858
2859 void MacroAssembler::push_CPU_state() {
2860 // %%%%% need to implement this
2861 }
2862
2863
2864 void MacroAssembler::pop_CPU_state() {
2865 // %%%%% need to implement this
2866 }
2867
2868
2869
2870 void MacroAssembler::verify_tlab() {
2871 #ifdef ASSERT
2872 if (UseTLAB && VerifyOops) {
2873 Label next, next2, ok;
2874 Register t1 = L0;
2875 Register t2 = L1;
2876 Register t3 = L2;
2877
2878 save_frame(0);
2879 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
2880 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_start_offset()), t2);
2881 or3(t1, t2, t3);
2882 cmp_and_br_short(t1, t2, Assembler::greaterEqual, Assembler::pn, next);
2883 STOP("assert(top >= start)");
2884 should_not_reach_here();
2885
2886 bind(next);
2887 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
2888 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), t2);
2889 or3(t3, t2, t3);
2890 cmp_and_br_short(t1, t2, Assembler::lessEqual, Assembler::pn, next2);
2891 STOP("assert(top <= end)");
2892 should_not_reach_here();
2893
2894 bind(next2);
2895 and3(t3, MinObjAlignmentInBytesMask, t3);
2896 cmp_and_br_short(t3, 0, Assembler::lessEqual, Assembler::pn, ok);
2897 STOP("assert(aligned)");
2898 should_not_reach_here();
2899
2900 bind(ok);
2901 restore();
2902 }
2903 #endif
2904 }
2905
2906
2907 void MacroAssembler::eden_allocate(
2908 Register obj, // result: pointer to object after successful allocation
2909 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise
2910 int con_size_in_bytes, // object size in bytes if known at compile time
2911 Register t1, // temp register
2912 Register t2, // temp register
2913 Label& slow_case // continuation point if fast allocation fails
2914 ){
2915 // make sure arguments make sense
2916 assert_different_registers(obj, var_size_in_bytes, t1, t2);
2917 assert(0 <= con_size_in_bytes && Assembler::is_simm13(con_size_in_bytes), "illegal object size");
2918 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
2919
2920 if (!Universe::heap()->supports_inline_contig_alloc()) {
2921 // No allocation in the shared eden.
2922 ba(slow_case);
2923 delayed()->nop();
2924 } else {
2925 // get eden boundaries
2926 // note: we need both top & top_addr!
2927 const Register top_addr = t1;
2928 const Register end = t2;
2929
2930 CollectedHeap* ch = Universe::heap();
2931 set((intx)ch->top_addr(), top_addr);
2932 intx delta = (intx)ch->end_addr() - (intx)ch->top_addr();
2933 ld_ptr(top_addr, delta, end);
2934 ld_ptr(top_addr, 0, obj);
2935
2936 // try to allocate
2937 Label retry;
2938 bind(retry);
2939 #ifdef ASSERT
2940 // make sure eden top is properly aligned
2941 {
2942 Label L;
2943 btst(MinObjAlignmentInBytesMask, obj);
2944 br(Assembler::zero, false, Assembler::pt, L);
2945 delayed()->nop();
2946 STOP("eden top is not properly aligned");
2947 bind(L);
2948 }
2949 #endif // ASSERT
2950 const Register free = end;
2951 sub(end, obj, free); // compute amount of free space
2952 if (var_size_in_bytes->is_valid()) {
2953 // size is unknown at compile time
2954 cmp(free, var_size_in_bytes);
2955 brx(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
2956 delayed()->add(obj, var_size_in_bytes, end);
2957 } else {
2958 // size is known at compile time
2959 cmp(free, con_size_in_bytes);
2960 brx(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
2961 delayed()->add(obj, con_size_in_bytes, end);
2962 }
2963 // Compare obj with the value at top_addr; if still equal, swap the value of
2964 // end with the value at top_addr. If not equal, read the value at top_addr
2965 // into end.
2966 cas_ptr(top_addr, obj, end);
2967 // if someone beat us on the allocation, try again, otherwise continue
2968 cmp(obj, end);
2969 brx(Assembler::notEqual, false, Assembler::pn, retry);
2970 delayed()->mov(end, obj); // nop if successfull since obj == end
2971
2972 #ifdef ASSERT
2973 // make sure eden top is properly aligned
2974 {
2975 Label L;
2976 const Register top_addr = t1;
2977
2978 set((intx)ch->top_addr(), top_addr);
2979 ld_ptr(top_addr, 0, top_addr);
2980 btst(MinObjAlignmentInBytesMask, top_addr);
2981 br(Assembler::zero, false, Assembler::pt, L);
2982 delayed()->nop();
2983 STOP("eden top is not properly aligned");
2984 bind(L);
2985 }
2986 #endif // ASSERT
2987 }
2988 }
2989
2990
2991 void MacroAssembler::tlab_allocate(
2992 Register obj, // result: pointer to object after successful allocation
2993 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise
2994 int con_size_in_bytes, // object size in bytes if known at compile time
2995 Register t1, // temp register
2996 Label& slow_case // continuation point if fast allocation fails
2997 ){
2998 // make sure arguments make sense
2999 assert_different_registers(obj, var_size_in_bytes, t1);
3000 assert(0 <= con_size_in_bytes && is_simm13(con_size_in_bytes), "illegal object size");
3001 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
3002
3003 const Register free = t1;
3004
3005 verify_tlab();
3006
3007 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), obj);
3008
3009 // calculate amount of free space
3010 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), free);
3011 sub(free, obj, free);
3012
3013 Label done;
3014 if (var_size_in_bytes == noreg) {
3015 cmp(free, con_size_in_bytes);
3016 } else {
3017 cmp(free, var_size_in_bytes);
3018 }
3019 br(Assembler::less, false, Assembler::pn, slow_case);
3020 // calculate the new top pointer
3021 if (var_size_in_bytes == noreg) {
3022 delayed()->add(obj, con_size_in_bytes, free);
3023 } else {
3024 delayed()->add(obj, var_size_in_bytes, free);
3025 }
3026
3027 bind(done);
3028
3029 #ifdef ASSERT
3030 // make sure new free pointer is properly aligned
3031 {
3032 Label L;
3033 btst(MinObjAlignmentInBytesMask, free);
3034 br(Assembler::zero, false, Assembler::pt, L);
3035 delayed()->nop();
3036 STOP("updated TLAB free is not properly aligned");
3037 bind(L);
3038 }
3039 #endif // ASSERT
3040
3041 // update the tlab top pointer
3042 st_ptr(free, G2_thread, in_bytes(JavaThread::tlab_top_offset()));
3043 verify_tlab();
3044 }
3045
3046 void MacroAssembler::zero_memory(Register base, Register index) {
3047 assert_different_registers(base, index);
3048 Label loop;
3049 bind(loop);
3050 subcc(index, HeapWordSize, index);
3051 brx(Assembler::greaterEqual, true, Assembler::pt, loop);
3052 delayed()->st_ptr(G0, base, index);
3053 }
3054
3055 void MacroAssembler::incr_allocated_bytes(RegisterOrConstant size_in_bytes,
3056 Register t1, Register t2) {
3057 // Bump total bytes allocated by this thread
3058 assert(t1->is_global(), "must be global reg"); // so all 64 bits are saved on a context switch
3059 assert_different_registers(size_in_bytes.register_or_noreg(), t1, t2);
3060 // v8 support has gone the way of the dodo
3061 ldx(G2_thread, in_bytes(JavaThread::allocated_bytes_offset()), t1);
3062 add(t1, ensure_simm13_or_reg(size_in_bytes, t2), t1);
3063 stx(t1, G2_thread, in_bytes(JavaThread::allocated_bytes_offset()));
3064 }
3065
3066 Assembler::Condition MacroAssembler::negate_condition(Assembler::Condition cond) {
3067 switch (cond) {
3068 // Note some conditions are synonyms for others
3069 case Assembler::never: return Assembler::always;
3070 case Assembler::zero: return Assembler::notZero;
3071 case Assembler::lessEqual: return Assembler::greater;
3072 case Assembler::less: return Assembler::greaterEqual;
3073 case Assembler::lessEqualUnsigned: return Assembler::greaterUnsigned;
3074 case Assembler::lessUnsigned: return Assembler::greaterEqualUnsigned;
3075 case Assembler::negative: return Assembler::positive;
3076 case Assembler::overflowSet: return Assembler::overflowClear;
3077 case Assembler::always: return Assembler::never;
3078 case Assembler::notZero: return Assembler::zero;
3079 case Assembler::greater: return Assembler::lessEqual;
3080 case Assembler::greaterEqual: return Assembler::less;
3081 case Assembler::greaterUnsigned: return Assembler::lessEqualUnsigned;
3082 case Assembler::greaterEqualUnsigned: return Assembler::lessUnsigned;
3083 case Assembler::positive: return Assembler::negative;
3084 case Assembler::overflowClear: return Assembler::overflowSet;
3085 }
3086
3087 ShouldNotReachHere(); return Assembler::overflowClear;
3088 }
3089
3090 void MacroAssembler::cond_inc(Assembler::Condition cond, address counter_ptr,
3091 Register Rtmp1, Register Rtmp2 /*, Register Rtmp3, Register Rtmp4 */) {
3092 Condition negated_cond = negate_condition(cond);
3093 Label L;
3094 brx(negated_cond, false, Assembler::pt, L);
3095 delayed()->nop();
3096 inc_counter(counter_ptr, Rtmp1, Rtmp2);
3097 bind(L);
3098 }
3099
3100 void MacroAssembler::inc_counter(address counter_addr, Register Rtmp1, Register Rtmp2) {
3101 AddressLiteral addrlit(counter_addr);
3102 sethi(addrlit, Rtmp1); // Move hi22 bits into temporary register.
3103 Address addr(Rtmp1, addrlit.low10()); // Build an address with low10 bits.
3104 ld(addr, Rtmp2);
3105 inc(Rtmp2);
3106 st(Rtmp2, addr);
3107 }
3108
3109 void MacroAssembler::inc_counter(int* counter_addr, Register Rtmp1, Register Rtmp2) {
3110 inc_counter((address) counter_addr, Rtmp1, Rtmp2);
3111 }
3112
3113 SkipIfEqual::SkipIfEqual(
3114 MacroAssembler* masm, Register temp, const bool* flag_addr,
3115 Assembler::Condition condition) {
3116 _masm = masm;
3117 AddressLiteral flag(flag_addr);
3118 _masm->sethi(flag, temp);
3119 _masm->ldub(temp, flag.low10(), temp);
3120 _masm->tst(temp);
3121 _masm->br(condition, false, Assembler::pt, _label);
3122 _masm->delayed()->nop();
3123 }
3124
3125 SkipIfEqual::~SkipIfEqual() {
3126 _masm->bind(_label);
3127 }
3128
3129 void MacroAssembler::bang_stack_with_offset(int offset) {
3130 // stack grows down, caller passes positive offset
3131 assert(offset > 0, "must bang with negative offset");
3132 set((-offset)+STACK_BIAS, G3_scratch);
3133 st(G0, SP, G3_scratch);
3134 }
3135
3136 // Writes to stack successive pages until offset reached to check for
3137 // stack overflow + shadow pages. This clobbers tsp and scratch.
3138 void MacroAssembler::bang_stack_size(Register Rsize, Register Rtsp,
3139 Register Rscratch) {
3140 // Use stack pointer in temp stack pointer
3141 mov(SP, Rtsp);
3142
3143 // Bang stack for total size given plus stack shadow page size.
3144 // Bang one page at a time because a large size can overflow yellow and
3145 // red zones (the bang will fail but stack overflow handling can't tell that
3146 // it was a stack overflow bang vs a regular segv).
3147 int offset = os::vm_page_size();
3148 Register Roffset = Rscratch;
3149
3150 Label loop;
3151 bind(loop);
3152 set((-offset)+STACK_BIAS, Rscratch);
3153 st(G0, Rtsp, Rscratch);
3154 set(offset, Roffset);
3155 sub(Rsize, Roffset, Rsize);
3156 cmp(Rsize, G0);
3157 br(Assembler::greater, false, Assembler::pn, loop);
3158 delayed()->sub(Rtsp, Roffset, Rtsp);
3159
3160 // Bang down shadow pages too.
3161 // At this point, (tmp-0) is the last address touched, so don't
3162 // touch it again. (It was touched as (tmp-pagesize) but then tmp
3163 // was post-decremented.) Skip this address by starting at i=1, and
3164 // touch a few more pages below. N.B. It is important to touch all
3165 // the way down to and including i=StackShadowPages.
3166 for (int i = 1; i < JavaThread::stack_shadow_zone_size() / os::vm_page_size(); i++) {
3167 set((-i*offset)+STACK_BIAS, Rscratch);
3168 st(G0, Rtsp, Rscratch);
3169 }
3170 }
3171
3172 void MacroAssembler::reserved_stack_check() {
3173 // testing if reserved zone needs to be enabled
3174 Label no_reserved_zone_enabling;
3175
3176 ld_ptr(G2_thread, JavaThread::reserved_stack_activation_offset(), G4_scratch);
3177 cmp_and_brx_short(SP, G4_scratch, Assembler::lessUnsigned, Assembler::pt, no_reserved_zone_enabling);
3178
3179 call_VM_leaf(L0, CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), G2_thread);
3180
3181 AddressLiteral stub(StubRoutines::throw_delayed_StackOverflowError_entry());
3182 jump_to(stub, G4_scratch);
3183 delayed()->restore();
3184
3185 should_not_reach_here();
3186
3187 bind(no_reserved_zone_enabling);
3188 }
3189 // ((OopHandle)result).resolve();
3190 void MacroAssembler::resolve_oop_handle(Register result, Register tmp) {
3191 // OopHandle::resolve is an indirection.
3192 access_load_at(T_OBJECT, IN_NATIVE, Address(result, 0), result, tmp);
3193 }
3194
3195 void MacroAssembler::load_mirror(Register mirror, Register method, Register tmp) {
3196 const int mirror_offset = in_bytes(Klass::java_mirror_offset());
3197 ld_ptr(method, in_bytes(Method::const_offset()), mirror);
3198 ld_ptr(mirror, in_bytes(ConstMethod::constants_offset()), mirror);
3199 ld_ptr(mirror, ConstantPool::pool_holder_offset_in_bytes(), mirror);
3200 ld_ptr(mirror, mirror_offset, mirror);
3201 resolve_oop_handle(mirror, tmp);
3202 }
3203
3204 void MacroAssembler::load_klass(Register src_oop, Register klass) {
3205 // The number of bytes in this code is used by
3206 // MachCallDynamicJavaNode::ret_addr_offset()
3207 // if this changes, change that.
3208 if (UseCompressedClassPointers) {
3209 lduw(src_oop, oopDesc::klass_offset_in_bytes(), klass);
3210 decode_klass_not_null(klass);
3211 } else {
3212 ld_ptr(src_oop, oopDesc::klass_offset_in_bytes(), klass);
3213 }
3214 }
3215
3216 void MacroAssembler::store_klass(Register klass, Register dst_oop) {
3217 if (UseCompressedClassPointers) {
3218 assert(dst_oop != klass, "not enough registers");
3219 encode_klass_not_null(klass);
3220 st(klass, dst_oop, oopDesc::klass_offset_in_bytes());
3221 } else {
3222 st_ptr(klass, dst_oop, oopDesc::klass_offset_in_bytes());
3223 }
3224 }
3225
3226 void MacroAssembler::store_klass_gap(Register s, Register d) {
3227 if (UseCompressedClassPointers) {
3228 assert(s != d, "not enough registers");
3229 st(s, d, oopDesc::klass_gap_offset_in_bytes());
3230 }
3231 }
3232
3233 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators,
3234 Register src, Address dst, Register tmp) {
3235 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3236 decorators = AccessInternal::decorator_fixup(decorators);
3237 bool as_raw = (decorators & AS_RAW) != 0;
3238 if (as_raw) {
3239 bs->BarrierSetAssembler::store_at(this, decorators, type, src, dst, tmp);
3240 } else {
3241 bs->store_at(this, decorators, type, src, dst, tmp);
3242 }
3243 }
3244
3245 void MacroAssembler::access_load_at(BasicType type, DecoratorSet decorators,
3246 Address src, Register dst, Register tmp) {
3247 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3248 decorators = AccessInternal::decorator_fixup(decorators);
3249 bool as_raw = (decorators & AS_RAW) != 0;
3250 if (as_raw) {
3251 bs->BarrierSetAssembler::load_at(this, decorators, type, src, dst, tmp);
3252 } else {
3253 bs->load_at(this, decorators, type, src, dst, tmp);
3254 }
3255 }
3256
3257 void MacroAssembler::load_heap_oop(const Address& s, Register d, Register tmp, DecoratorSet decorators) {
3258 access_load_at(T_OBJECT, IN_HEAP | decorators, s, d, tmp);
3259 }
3260
3261 void MacroAssembler::load_heap_oop(Register s1, Register s2, Register d, Register tmp, DecoratorSet decorators) {
3262 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, s2), d, tmp);
3263 }
3264
3265 void MacroAssembler::load_heap_oop(Register s1, int simm13a, Register d, Register tmp, DecoratorSet decorators) {
3266 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, simm13a), d, tmp);
3267 }
3268
3269 void MacroAssembler::load_heap_oop(Register s1, RegisterOrConstant s2, Register d, Register tmp, DecoratorSet decorators) {
3270 if (s2.is_constant()) {
3271 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, s2.as_constant()), d, tmp);
3272 } else {
3273 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, s2.as_register()), d, tmp);
3274 }
3275 }
3276
3277 void MacroAssembler::store_heap_oop(Register d, Register s1, Register s2, Register tmp, DecoratorSet decorators) {
3278 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(s1, s2), tmp);
3279 }
3280
3281 void MacroAssembler::store_heap_oop(Register d, Register s1, int simm13a, Register tmp, DecoratorSet decorators) {
3282 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(s1, simm13a), tmp);
3283 }
3284
3285 void MacroAssembler::store_heap_oop(Register d, const Address& a, int offset, Register tmp, DecoratorSet decorators) {
3286 if (a.has_index()) {
3287 assert(!a.has_disp(), "not supported yet");
3288 assert(offset == 0, "not supported yet");
3289 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(a.base(), a.index()), tmp);
3290 } else {
3291 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(a.base(), a.disp() + offset), tmp);
3292 }
3293 }
3294
3295
3296 void MacroAssembler::encode_heap_oop(Register src, Register dst) {
3297 assert (UseCompressedOops, "must be compressed");
3298 assert (Universe::heap() != NULL, "java heap should be initialized");
3299 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
3300 verify_oop(src);
3301 if (CompressedOops::base() == NULL) {
3302 srlx(src, LogMinObjAlignmentInBytes, dst);
3303 return;
3304 }
3305 Label done;
3306 if (src == dst) {
3307 // optimize for frequent case src == dst
3308 bpr(rc_nz, true, Assembler::pt, src, done);
3309 delayed() -> sub(src, G6_heapbase, dst); // annuled if not taken
3310 bind(done);
3311 srlx(src, LogMinObjAlignmentInBytes, dst);
3312 } else {
3313 bpr(rc_z, false, Assembler::pn, src, done);
3314 delayed() -> mov(G0, dst);
3315 // could be moved before branch, and annulate delay,
3316 // but may add some unneeded work decoding null
3317 sub(src, G6_heapbase, dst);
3318 srlx(dst, LogMinObjAlignmentInBytes, dst);
3319 bind(done);
3320 }
3321 }
3322
3323
3324 void MacroAssembler::encode_heap_oop_not_null(Register r) {
3325 assert (UseCompressedOops, "must be compressed");
3326 assert (Universe::heap() != NULL, "java heap should be initialized");
3327 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
3328 verify_oop(r);
3329 if (CompressedOops::base() != NULL)
3330 sub(r, G6_heapbase, r);
3331 srlx(r, LogMinObjAlignmentInBytes, r);
3332 }
3333
3334 void MacroAssembler::encode_heap_oop_not_null(Register src, Register dst) {
3335 assert (UseCompressedOops, "must be compressed");
3336 assert (Universe::heap() != NULL, "java heap should be initialized");
3337 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
3338 verify_oop(src);
3339 if (CompressedOops::base() == NULL) {
3340 srlx(src, LogMinObjAlignmentInBytes, dst);
3341 } else {
3342 sub(src, G6_heapbase, dst);
3343 srlx(dst, LogMinObjAlignmentInBytes, dst);
3344 }
3345 }
3346
3347 // Same algorithm as oops.inline.hpp decode_heap_oop.
3348 void MacroAssembler::decode_heap_oop(Register src, Register dst) {
3349 assert (UseCompressedOops, "must be compressed");
3350 assert (Universe::heap() != NULL, "java heap should be initialized");
3351 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
3352 sllx(src, LogMinObjAlignmentInBytes, dst);
3353 if (CompressedOops::base() != NULL) {
3354 Label done;
3355 bpr(rc_nz, true, Assembler::pt, dst, done);
3356 delayed() -> add(dst, G6_heapbase, dst); // annuled if not taken
3357 bind(done);
3358 }
3359 verify_oop(dst);
3360 }
3361
3362 void MacroAssembler::decode_heap_oop_not_null(Register r) {
3363 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3364 // pd_code_size_limit.
3365 // Also do not verify_oop as this is called by verify_oop.
3366 assert (UseCompressedOops, "must be compressed");
3367 assert (Universe::heap() != NULL, "java heap should be initialized");
3368 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
3369 sllx(r, LogMinObjAlignmentInBytes, r);
3370 if (CompressedOops::base() != NULL)
3371 add(r, G6_heapbase, r);
3372 }
3373
3374 void MacroAssembler::decode_heap_oop_not_null(Register src, Register dst) {
3375 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3376 // pd_code_size_limit.
3377 // Also do not verify_oop as this is called by verify_oop.
3378 assert (UseCompressedOops, "must be compressed");
3379 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
3380 sllx(src, LogMinObjAlignmentInBytes, dst);
3381 if (CompressedOops::base() != NULL)
3382 add(dst, G6_heapbase, dst);
3383 }
3384
3385 void MacroAssembler::encode_klass_not_null(Register r) {
3386 assert (UseCompressedClassPointers, "must be compressed");
3387 if (CompressedKlassPointers::base() != NULL) {
3388 assert(r != G6_heapbase, "bad register choice");
3389 set((intptr_t)CompressedKlassPointers::base(), G6_heapbase);
3390 sub(r, G6_heapbase, r);
3391 if (CompressedKlassPointers::shift() != 0) {
3392 assert (LogKlassAlignmentInBytes == CompressedKlassPointers::shift(), "decode alg wrong");
3393 srlx(r, LogKlassAlignmentInBytes, r);
3394 }
3395 reinit_heapbase();
3396 } else {
3397 assert (LogKlassAlignmentInBytes == CompressedKlassPointers::shift() || CompressedKlassPointers::shift() == 0, "decode alg wrong");
3398 srlx(r, CompressedKlassPointers::shift(), r);
3399 }
3400 }
3401
3402 void MacroAssembler::encode_klass_not_null(Register src, Register dst) {
3403 if (src == dst) {
3404 encode_klass_not_null(src);
3405 } else {
3406 assert (UseCompressedClassPointers, "must be compressed");
3407 if (CompressedKlassPointers::base() != NULL) {
3408 set((intptr_t)CompressedKlassPointers::base(), dst);
3409 sub(src, dst, dst);
3410 if (CompressedKlassPointers::shift() != 0) {
3411 srlx(dst, LogKlassAlignmentInBytes, dst);
3412 }
3413 } else {
3414 // shift src into dst
3415 assert (LogKlassAlignmentInBytes == CompressedKlassPointers::shift() || CompressedKlassPointers::shift() == 0, "decode alg wrong");
3416 srlx(src, CompressedKlassPointers::shift(), dst);
3417 }
3418 }
3419 }
3420
3421 // Function instr_size_for_decode_klass_not_null() counts the instructions
3422 // generated by decode_klass_not_null() and reinit_heapbase(). Hence, if
3423 // the instructions they generate change, then this method needs to be updated.
3424 int MacroAssembler::instr_size_for_decode_klass_not_null() {
3425 assert (UseCompressedClassPointers, "only for compressed klass ptrs");
3426 int num_instrs = 1; // shift src,dst or add
3427 if (CompressedKlassPointers::base() != NULL) {
3428 // set + add + set
3429 num_instrs += insts_for_internal_set((intptr_t)CompressedKlassPointers::base()) +
3430 insts_for_internal_set((intptr_t)CompressedOops::ptrs_base());
3431 if (CompressedKlassPointers::shift() != 0) {
3432 num_instrs += 1; // sllx
3433 }
3434 }
3435 return num_instrs * BytesPerInstWord;
3436 }
3437
3438 // !!! If the instructions that get generated here change then function
3439 // instr_size_for_decode_klass_not_null() needs to get updated.
3440 void MacroAssembler::decode_klass_not_null(Register r) {
3441 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3442 // pd_code_size_limit.
3443 assert (UseCompressedClassPointers, "must be compressed");
3444 if (CompressedKlassPointers::base() != NULL) {
3445 assert(r != G6_heapbase, "bad register choice");
3446 set((intptr_t)CompressedKlassPointers::base(), G6_heapbase);
3447 if (CompressedKlassPointers::shift() != 0)
3448 sllx(r, LogKlassAlignmentInBytes, r);
3449 add(r, G6_heapbase, r);
3450 reinit_heapbase();
3451 } else {
3452 assert (LogKlassAlignmentInBytes == CompressedKlassPointers::shift() || CompressedKlassPointers::shift() == 0, "decode alg wrong");
3453 sllx(r, CompressedKlassPointers::shift(), r);
3454 }
3455 }
3456
3457 void MacroAssembler::decode_klass_not_null(Register src, Register dst) {
3458 if (src == dst) {
3459 decode_klass_not_null(src);
3460 } else {
3461 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3462 // pd_code_size_limit.
3463 assert (UseCompressedClassPointers, "must be compressed");
3464 if (CompressedKlassPointers::base() != NULL) {
3465 if (CompressedKlassPointers::shift() != 0) {
3466 assert((src != G6_heapbase) && (dst != G6_heapbase), "bad register choice");
3467 set((intptr_t)CompressedKlassPointers::base(), G6_heapbase);
3468 sllx(src, LogKlassAlignmentInBytes, dst);
3469 add(dst, G6_heapbase, dst);
3470 reinit_heapbase();
3471 } else {
3472 set((intptr_t)CompressedKlassPointers::base(), dst);
3473 add(src, dst, dst);
3474 }
3475 } else {
3476 // shift/mov src into dst.
3477 assert (LogKlassAlignmentInBytes == CompressedKlassPointers::shift() || CompressedKlassPointers::shift() == 0, "decode alg wrong");
3478 sllx(src, CompressedKlassPointers::shift(), dst);
3479 }
3480 }
3481 }
3482
3483 void MacroAssembler::reinit_heapbase() {
3484 if (UseCompressedOops || UseCompressedClassPointers) {
3485 if (Universe::heap() != NULL) {
3486 set((intptr_t)CompressedOops::ptrs_base(), G6_heapbase);
3487 } else {
3488 AddressLiteral base(CompressedOops::ptrs_base_addr());
3489 load_ptr_contents(base, G6_heapbase);
3490 }
3491 }
3492 }
3493
3494 #ifdef COMPILER2
3495
3496 // Compress char[] to byte[] by compressing 16 bytes at once. Return 0 on failure.
3497 void MacroAssembler::string_compress_16(Register src, Register dst, Register cnt, Register result,
3498 Register tmp1, Register tmp2, Register tmp3, Register tmp4,
3499 FloatRegister ftmp1, FloatRegister ftmp2, FloatRegister ftmp3, Label& Ldone) {
3500 Label Lloop, Lslow;
3501 assert(UseVIS >= 3, "VIS3 is required");
3502 assert_different_registers(src, dst, cnt, tmp1, tmp2, tmp3, tmp4, result);
3503 assert_different_registers(ftmp1, ftmp2, ftmp3);
3504
3505 // Check if cnt >= 8 (= 16 bytes)
3506 cmp(cnt, 8);
3507 br(Assembler::less, false, Assembler::pn, Lslow);
3508 delayed()->mov(cnt, result); // copy count
3509
3510 // Check for 8-byte alignment of src and dst
3511 or3(src, dst, tmp1);
3512 andcc(tmp1, 7, G0);
3513 br(Assembler::notZero, false, Assembler::pn, Lslow);
3514 delayed()->nop();
3515
3516 // Set mask for bshuffle instruction
3517 Register mask = tmp4;
3518 set(0x13579bdf, mask);
3519 bmask(mask, G0, G0);
3520
3521 // Set mask to 0xff00 ff00 ff00 ff00 to check for non-latin1 characters
3522 Assembler::sethi(0xff00fc00, mask); // mask = 0x0000 0000 ff00 fc00
3523 add(mask, 0x300, mask); // mask = 0x0000 0000 ff00 ff00
3524 sllx(mask, 32, tmp1); // tmp1 = 0xff00 ff00 0000 0000
3525 or3(mask, tmp1, mask); // mask = 0xff00 ff00 ff00 ff00
3526
3527 // Load first 8 bytes
3528 ldx(src, 0, tmp1);
3529
3530 bind(Lloop);
3531 // Load next 8 bytes
3532 ldx(src, 8, tmp2);
3533
3534 // Check for non-latin1 character by testing if the most significant byte of a char is set.
3535 // Although we have to move the data between integer and floating point registers, this is
3536 // still faster than the corresponding VIS instructions (ford/fand/fcmpd).
3537 or3(tmp1, tmp2, tmp3);
3538 btst(tmp3, mask);
3539 // annul zeroing if branch is not taken to preserve original count
3540 brx(Assembler::notZero, true, Assembler::pn, Ldone);
3541 delayed()->mov(G0, result); // 0 - failed
3542
3543 // Move bytes into float register
3544 movxtod(tmp1, ftmp1);
3545 movxtod(tmp2, ftmp2);
3546
3547 // Compress by copying one byte per char from ftmp1 and ftmp2 to ftmp3
3548 bshuffle(ftmp1, ftmp2, ftmp3);
3549 stf(FloatRegisterImpl::D, ftmp3, dst, 0);
3550
3551 // Increment addresses and decrement count
3552 inc(src, 16);
3553 inc(dst, 8);
3554 dec(cnt, 8);
3555
3556 cmp(cnt, 8);
3557 // annul LDX if branch is not taken to prevent access past end of string
3558 br(Assembler::greaterEqual, true, Assembler::pt, Lloop);
3559 delayed()->ldx(src, 0, tmp1);
3560
3561 // Fallback to slow version
3562 bind(Lslow);
3563 }
3564
3565 // Compress char[] to byte[]. Return 0 on failure.
3566 void MacroAssembler::string_compress(Register src, Register dst, Register cnt, Register result, Register tmp, Label& Ldone) {
3567 Label Lloop;
3568 assert_different_registers(src, dst, cnt, tmp, result);
3569
3570 lduh(src, 0, tmp);
3571
3572 bind(Lloop);
3573 inc(src, sizeof(jchar));
3574 cmp(tmp, 0xff);
3575 // annul zeroing if branch is not taken to preserve original count
3576 br(Assembler::greater, true, Assembler::pn, Ldone); // don't check xcc
3577 delayed()->mov(G0, result); // 0 - failed
3578 deccc(cnt);
3579 stb(tmp, dst, 0);
3580 inc(dst);
3581 // annul LDUH if branch is not taken to prevent access past end of string
3582 br(Assembler::notZero, true, Assembler::pt, Lloop);
3583 delayed()->lduh(src, 0, tmp); // hoisted
3584 }
3585
3586 // Inflate byte[] to char[] by inflating 16 bytes at once.
3587 void MacroAssembler::string_inflate_16(Register src, Register dst, Register cnt, Register tmp,
3588 FloatRegister ftmp1, FloatRegister ftmp2, FloatRegister ftmp3, FloatRegister ftmp4, Label& Ldone) {
3589 Label Lloop, Lslow;
3590 assert(UseVIS >= 3, "VIS3 is required");
3591 assert_different_registers(src, dst, cnt, tmp);
3592 assert_different_registers(ftmp1, ftmp2, ftmp3, ftmp4);
3593
3594 // Check if cnt >= 8 (= 16 bytes)
3595 cmp(cnt, 8);
3596 br(Assembler::less, false, Assembler::pn, Lslow);
3597 delayed()->nop();
3598
3599 // Check for 8-byte alignment of src and dst
3600 or3(src, dst, tmp);
3601 andcc(tmp, 7, G0);
3602 br(Assembler::notZero, false, Assembler::pn, Lslow);
3603 // Initialize float register to zero
3604 FloatRegister zerof = ftmp4;
3605 delayed()->fzero(FloatRegisterImpl::D, zerof);
3606
3607 // Load first 8 bytes
3608 ldf(FloatRegisterImpl::D, src, 0, ftmp1);
3609
3610 bind(Lloop);
3611 inc(src, 8);
3612 dec(cnt, 8);
3613
3614 // Inflate the string by interleaving each byte from the source array
3615 // with a zero byte and storing the result in the destination array.
3616 fpmerge(zerof, ftmp1->successor(), ftmp2);
3617 stf(FloatRegisterImpl::D, ftmp2, dst, 8);
3618 fpmerge(zerof, ftmp1, ftmp3);
3619 stf(FloatRegisterImpl::D, ftmp3, dst, 0);
3620
3621 inc(dst, 16);
3622
3623 cmp(cnt, 8);
3624 // annul LDX if branch is not taken to prevent access past end of string
3625 br(Assembler::greaterEqual, true, Assembler::pt, Lloop);
3626 delayed()->ldf(FloatRegisterImpl::D, src, 0, ftmp1);
3627
3628 // Fallback to slow version
3629 bind(Lslow);
3630 }
3631
3632 // Inflate byte[] to char[].
3633 void MacroAssembler::string_inflate(Register src, Register dst, Register cnt, Register tmp, Label& Ldone) {
3634 Label Loop;
3635 assert_different_registers(src, dst, cnt, tmp);
3636
3637 ldub(src, 0, tmp);
3638 bind(Loop);
3639 inc(src);
3640 deccc(cnt);
3641 sth(tmp, dst, 0);
3642 inc(dst, sizeof(jchar));
3643 // annul LDUB if branch is not taken to prevent access past end of string
3644 br(Assembler::notZero, true, Assembler::pt, Loop);
3645 delayed()->ldub(src, 0, tmp); // hoisted
3646 }
3647
3648 void MacroAssembler::string_compare(Register str1, Register str2,
3649 Register cnt1, Register cnt2,
3650 Register tmp1, Register tmp2,
3651 Register result, int ae) {
3652 Label Ldone, Lloop;
3653 assert_different_registers(str1, str2, cnt1, cnt2, tmp1, result);
3654 int stride1, stride2;
3655
3656 // Note: Making use of the fact that compareTo(a, b) == -compareTo(b, a)
3657 // we interchange str1 and str2 in the UL case and negate the result.
3658 // Like this, str1 is always latin1 encoded, expect for the UU case.
3659
3660 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3661 srl(cnt2, 1, cnt2);
3662 }
3663
3664 // See if the lengths are different, and calculate min in cnt1.
3665 // Save diff in case we need it for a tie-breaker.
3666 Label Lskip;
3667 Register diff = tmp1;
3668 subcc(cnt1, cnt2, diff);
3669 br(Assembler::greater, true, Assembler::pt, Lskip);
3670 // cnt2 is shorter, so use its count:
3671 delayed()->mov(cnt2, cnt1);
3672 bind(Lskip);
3673
3674 // Rename registers
3675 Register limit1 = cnt1;
3676 Register limit2 = limit1;
3677 Register chr1 = result;
3678 Register chr2 = cnt2;
3679 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3680 // We need an additional register to keep track of two limits
3681 assert_different_registers(str1, str2, cnt1, cnt2, tmp1, tmp2, result);
3682 limit2 = tmp2;
3683 }
3684
3685 // Is the minimum length zero?
3686 cmp(limit1, (int)0); // use cast to resolve overloading ambiguity
3687 br(Assembler::equal, true, Assembler::pn, Ldone);
3688 // result is difference in lengths
3689 if (ae == StrIntrinsicNode::UU) {
3690 delayed()->sra(diff, 1, result); // Divide by 2 to get number of chars
3691 } else {
3692 delayed()->mov(diff, result);
3693 }
3694
3695 // Load first characters
3696 if (ae == StrIntrinsicNode::LL) {
3697 stride1 = stride2 = sizeof(jbyte);
3698 ldub(str1, 0, chr1);
3699 ldub(str2, 0, chr2);
3700 } else if (ae == StrIntrinsicNode::UU) {
3701 stride1 = stride2 = sizeof(jchar);
3702 lduh(str1, 0, chr1);
3703 lduh(str2, 0, chr2);
3704 } else {
3705 stride1 = sizeof(jbyte);
3706 stride2 = sizeof(jchar);
3707 ldub(str1, 0, chr1);
3708 lduh(str2, 0, chr2);
3709 }
3710
3711 // Compare first characters
3712 subcc(chr1, chr2, chr1);
3713 br(Assembler::notZero, false, Assembler::pt, Ldone);
3714 assert(chr1 == result, "result must be pre-placed");
3715 delayed()->nop();
3716
3717 // Check if the strings start at same location
3718 cmp(str1, str2);
3719 brx(Assembler::equal, true, Assembler::pn, Ldone);
3720 delayed()->mov(G0, result); // result is zero
3721
3722 // We have no guarantee that on 64 bit the higher half of limit is 0
3723 signx(limit1);
3724
3725 // Get limit
3726 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3727 sll(limit1, 1, limit2);
3728 subcc(limit2, stride2, chr2);
3729 }
3730 subcc(limit1, stride1, chr1);
3731 br(Assembler::zero, true, Assembler::pn, Ldone);
3732 // result is difference in lengths
3733 if (ae == StrIntrinsicNode::UU) {
3734 delayed()->sra(diff, 1, result); // Divide by 2 to get number of chars
3735 } else {
3736 delayed()->mov(diff, result);
3737 }
3738
3739 // Shift str1 and str2 to the end of the arrays, negate limit
3740 add(str1, limit1, str1);
3741 add(str2, limit2, str2);
3742 neg(chr1, limit1); // limit1 = -(limit1-stride1)
3743 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3744 neg(chr2, limit2); // limit2 = -(limit2-stride2)
3745 }
3746
3747 // Compare the rest of the characters
3748 load_sized_value(Address(str1, limit1), chr1, (ae == StrIntrinsicNode::UU) ? 2 : 1, false);
3749
3750 bind(Lloop);
3751 load_sized_value(Address(str2, limit2), chr2, (ae == StrIntrinsicNode::LL) ? 1 : 2, false);
3752
3753 subcc(chr1, chr2, chr1);
3754 br(Assembler::notZero, false, Assembler::pt, Ldone);
3755 assert(chr1 == result, "result must be pre-placed");
3756 delayed()->inccc(limit1, stride1);
3757 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3758 inccc(limit2, stride2);
3759 }
3760
3761 // annul LDUB if branch is not taken to prevent access past end of string
3762 br(Assembler::notZero, true, Assembler::pt, Lloop);
3763 delayed()->load_sized_value(Address(str1, limit1), chr1, (ae == StrIntrinsicNode::UU) ? 2 : 1, false);
3764
3765 // If strings are equal up to min length, return the length difference.
3766 if (ae == StrIntrinsicNode::UU) {
3767 // Divide by 2 to get number of chars
3768 sra(diff, 1, result);
3769 } else {
3770 mov(diff, result);
3771 }
3772
3773 // Otherwise, return the difference between the first mismatched chars.
3774 bind(Ldone);
3775 if(ae == StrIntrinsicNode::UL) {
3776 // Negate result (see note above)
3777 neg(result);
3778 }
3779 }
3780
3781 void MacroAssembler::array_equals(bool is_array_equ, Register ary1, Register ary2,
3782 Register limit, Register tmp, Register result, bool is_byte) {
3783 Label Ldone, Lloop, Lremaining;
3784 assert_different_registers(ary1, ary2, limit, tmp, result);
3785
3786 int length_offset = arrayOopDesc::length_offset_in_bytes();
3787 int base_offset = arrayOopDesc::base_offset_in_bytes(is_byte ? T_BYTE : T_CHAR);
3788 assert(base_offset % 8 == 0, "Base offset must be 8-byte aligned");
3789
3790 if (is_array_equ) {
3791 // return true if the same array
3792 cmp(ary1, ary2);
3793 brx(Assembler::equal, true, Assembler::pn, Ldone);
3794 delayed()->mov(1, result); // equal
3795
3796 br_null(ary1, true, Assembler::pn, Ldone);
3797 delayed()->clr(result); // not equal
3798
3799 br_null(ary2, true, Assembler::pn, Ldone);
3800 delayed()->clr(result); // not equal
3801
3802 // load the lengths of arrays
3803 ld(Address(ary1, length_offset), limit);
3804 ld(Address(ary2, length_offset), tmp);
3805
3806 // return false if the two arrays are not equal length
3807 cmp(limit, tmp);
3808 br(Assembler::notEqual, true, Assembler::pn, Ldone);
3809 delayed()->clr(result); // not equal
3810 }
3811
3812 cmp_zero_and_br(Assembler::zero, limit, Ldone, true, Assembler::pn);
3813 delayed()->mov(1, result); // zero-length arrays are equal
3814
3815 if (is_array_equ) {
3816 // load array addresses
3817 add(ary1, base_offset, ary1);
3818 add(ary2, base_offset, ary2);
3819 // set byte count
3820 if (!is_byte) {
3821 sll(limit, exact_log2(sizeof(jchar)), limit);
3822 }
3823 } else {
3824 // We have no guarantee that on 64 bit the higher half of limit is 0
3825 signx(limit);
3826 }
3827
3828 #ifdef ASSERT
3829 // Sanity check for doubleword (8-byte) alignment of ary1 and ary2.
3830 // Guaranteed on 64-bit systems (see arrayOopDesc::header_size_in_bytes()).
3831 Label Laligned;
3832 or3(ary1, ary2, tmp);
3833 andcc(tmp, 7, tmp);
3834 br_null_short(tmp, Assembler::pn, Laligned);
3835 STOP("First array element is not 8-byte aligned.");
3836 should_not_reach_here();
3837 bind(Laligned);
3838 #endif
3839
3840 // Shift ary1 and ary2 to the end of the arrays, negate limit
3841 add(ary1, limit, ary1);
3842 add(ary2, limit, ary2);
3843 neg(limit, limit);
3844
3845 // MAIN LOOP
3846 // Load and compare array elements of size 'byte_width' until the elements are not
3847 // equal or we reached the end of the arrays. If the size of the arrays is not a
3848 // multiple of 'byte_width', we simply read over the end of the array, bail out and
3849 // compare the remaining bytes below by skipping the garbage bytes.
3850 ldx(ary1, limit, result);
3851 bind(Lloop);
3852 ldx(ary2, limit, tmp);
3853 inccc(limit, 8);
3854 // Bail out if we reached the end (but still do the comparison)
3855 br(Assembler::positive, false, Assembler::pn, Lremaining);
3856 delayed()->cmp(result, tmp);
3857 // Check equality of elements
3858 brx(Assembler::equal, false, Assembler::pt, target(Lloop));
3859 delayed()->ldx(ary1, limit, result);
3860
3861 ba(Ldone);
3862 delayed()->clr(result); // not equal
3863
3864 // TAIL COMPARISON
3865 // We got here because we reached the end of the arrays. 'limit' is the number of
3866 // garbage bytes we may have compared by reading over the end of the arrays. Shift
3867 // out the garbage and compare the remaining elements.
3868 bind(Lremaining);
3869 // Optimistic shortcut: elements potentially including garbage are equal
3870 brx(Assembler::equal, true, Assembler::pt, target(Ldone));
3871 delayed()->mov(1, result); // equal
3872 // Shift 'limit' bytes to the right and compare
3873 sll(limit, 3, limit); // bytes to bits
3874 srlx(result, limit, result);
3875 srlx(tmp, limit, tmp);
3876 cmp(result, tmp);
3877 clr(result);
3878 movcc(Assembler::equal, false, xcc, 1, result);
3879
3880 bind(Ldone);
3881 }
3882
3883 void MacroAssembler::has_negatives(Register inp, Register size, Register result, Register t2, Register t3, Register t4, Register t5) {
3884
3885 // test for negative bytes in input string of a given size
3886 // result 1 if found, 0 otherwise.
3887
3888 Label Lcore, Ltail, Lreturn, Lcore_rpt;
3889
3890 assert_different_registers(inp, size, t2, t3, t4, t5, result);
3891
3892 Register i = result; // result used as integer index i until very end
3893 Register lmask = t2; // t2 is aliased to lmask
3894
3895 // INITIALIZATION
3896 // ===========================================================
3897 // initialize highbits mask -> lmask = 0x8080808080808080 (8B/64b)
3898 // compute unaligned offset -> i
3899 // compute core end index -> t5
3900 Assembler::sethi(0x80808000, t2); //! sethi macro fails to emit optimal
3901 add(t2, 0x80, t2);
3902 sllx(t2, 32, t3);
3903 or3(t3, t2, lmask); // 0x8080808080808080 -> lmask
3904 sra(size,0,size);
3905 andcc(inp, 0x7, i); // unaligned offset -> i
3906 br(Assembler::zero, true, Assembler::pn, Lcore); // starts 8B aligned?
3907 delayed()->add(size, -8, t5); // (annuled) core end index -> t5
3908
3909 // ===========================================================
3910
3911 // UNALIGNED HEAD
3912 // ===========================================================
3913 // * unaligned head handling: grab aligned 8B containing unaligned inp(ut)
3914 // * obliterate (ignore) bytes outside string by shifting off reg ends
3915 // * compare with bitmask, short circuit return true if one or more high
3916 // bits set.
3917 cmp(size, 0);
3918 br(Assembler::zero, true, Assembler::pn, Lreturn); // short-circuit?
3919 delayed()->mov(0,result); // annuled so i not clobbered for following
3920 neg(i, t4);
3921 add(i, size, t5);
3922 ldx(inp, t4, t3); // raw aligned 8B containing unaligned head -> t3
3923 mov(8, t4);
3924 sub(t4, t5, t4);
3925 sra(t4, 31, t5);
3926 andn(t4, t5, t5);
3927 add(i, t5, t4);
3928 sll(t5, 3, t5);
3929 sll(t4, 3, t4); // # bits to shift right, left -> t5,t4
3930 srlx(t3, t5, t3);
3931 sllx(t3, t4, t3); // bytes outside string in 8B header obliterated -> t3
3932 andcc(lmask, t3, G0);
3933 brx(Assembler::notZero, true, Assembler::pn, Lreturn); // short circuit?
3934 delayed()->mov(1,result); // annuled so i not clobbered for following
3935 add(size, -8, t5); // core end index -> t5
3936 mov(8, t4);
3937 sub(t4, i, i); // # bytes examined in unalgn head (<8) -> i
3938 // ===========================================================
3939
3940 // ALIGNED CORE
3941 // ===========================================================
3942 // * iterate index i over aligned 8B sections of core, comparing with
3943 // bitmask, short circuit return true if one or more high bits set
3944 // t5 contains core end index/loop limit which is the index
3945 // of the MSB of last (unaligned) 8B fully contained in the string.
3946 // inp contains address of first byte in string/array
3947 // lmask contains 8B high bit mask for comparison
3948 // i contains next index to be processed (adr. inp+i is on 8B boundary)
3949 bind(Lcore);
3950 cmp_and_br_short(i, t5, Assembler::greater, Assembler::pn, Ltail);
3951 bind(Lcore_rpt);
3952 ldx(inp, i, t3);
3953 andcc(t3, lmask, G0);
3954 brx(Assembler::notZero, true, Assembler::pn, Lreturn);
3955 delayed()->mov(1, result); // annuled so i not clobbered for following
3956 add(i, 8, i);
3957 cmp_and_br_short(i, t5, Assembler::lessEqual, Assembler::pn, Lcore_rpt);
3958 // ===========================================================
3959
3960 // ALIGNED TAIL (<8B)
3961 // ===========================================================
3962 // handle aligned tail of 7B or less as complete 8B, obliterating end of
3963 // string bytes by shifting them off end, compare what's left with bitmask
3964 // inp contains address of first byte in string/array
3965 // lmask contains 8B high bit mask for comparison
3966 // i contains next index to be processed (adr. inp+i is on 8B boundary)
3967 bind(Ltail);
3968 subcc(size, i, t4); // # of remaining bytes in string -> t4
3969 // return 0 if no more remaining bytes
3970 br(Assembler::lessEqual, true, Assembler::pn, Lreturn);
3971 delayed()->mov(0, result); // annuled so i not clobbered for following
3972 ldx(inp, i, t3); // load final 8B (aligned) containing tail -> t3
3973 mov(8, t5);
3974 sub(t5, t4, t4);
3975 mov(0, result); // ** i clobbered at this point
3976 sll(t4, 3, t4); // bits beyond end of string -> t4
3977 srlx(t3, t4, t3); // bytes beyond end now obliterated -> t3
3978 andcc(lmask, t3, G0);
3979 movcc(Assembler::notZero, false, xcc, 1, result);
3980 bind(Lreturn);
3981 }
3982
3983 #endif
3984
3985
3986 // Use BIS for zeroing (count is in bytes).
3987 void MacroAssembler::bis_zeroing(Register to, Register count, Register temp, Label& Ldone) {
3988 assert(UseBlockZeroing && VM_Version::has_blk_zeroing(), "only works with BIS zeroing");
3989 Register end = count;
3990 int cache_line_size = VM_Version::prefetch_data_size();
3991 assert(cache_line_size > 0, "cache line size should be known for this code");
3992 // Minimum count when BIS zeroing can be used since
3993 // it needs membar which is expensive.
3994 int block_zero_size = MAX2(cache_line_size*3, (int)BlockZeroingLowLimit);
3995
3996 Label small_loop;
3997 // Check if count is negative (dead code) or zero.
3998 // Note, count uses 64bit in 64 bit VM.
3999 cmp_and_brx_short(count, 0, Assembler::lessEqual, Assembler::pn, Ldone);
4000
4001 // Use BIS zeroing only for big arrays since it requires membar.
4002 if (Assembler::is_simm13(block_zero_size)) { // < 4096
4003 cmp(count, block_zero_size);
4004 } else {
4005 set(block_zero_size, temp);
4006 cmp(count, temp);
4007 }
4008 br(Assembler::lessUnsigned, false, Assembler::pt, small_loop);
4009 delayed()->add(to, count, end);
4010
4011 // Note: size is >= three (32 bytes) cache lines.
4012
4013 // Clean the beginning of space up to next cache line.
4014 for (int offs = 0; offs < cache_line_size; offs += 8) {
4015 stx(G0, to, offs);
4016 }
4017
4018 // align to next cache line
4019 add(to, cache_line_size, to);
4020 and3(to, -cache_line_size, to);
4021
4022 // Note: size left >= two (32 bytes) cache lines.
4023
4024 // BIS should not be used to zero tail (64 bytes)
4025 // to avoid zeroing a header of the following object.
4026 sub(end, (cache_line_size*2)-8, end);
4027
4028 Label bis_loop;
4029 bind(bis_loop);
4030 stxa(G0, to, G0, Assembler::ASI_ST_BLKINIT_PRIMARY);
4031 add(to, cache_line_size, to);
4032 cmp_and_brx_short(to, end, Assembler::lessUnsigned, Assembler::pt, bis_loop);
4033
4034 // BIS needs membar.
4035 membar(Assembler::StoreLoad);
4036
4037 add(end, (cache_line_size*2)-8, end); // restore end
4038 cmp_and_brx_short(to, end, Assembler::greaterEqualUnsigned, Assembler::pn, Ldone);
4039
4040 // Clean the tail.
4041 bind(small_loop);
4042 stx(G0, to, 0);
4043 add(to, 8, to);
4044 cmp_and_brx_short(to, end, Assembler::lessUnsigned, Assembler::pt, small_loop);
4045 nop(); // Separate short branches
4046 }
4047
4048 /**
4049 * Update CRC-32[C] with a byte value according to constants in table
4050 *
4051 * @param [in,out]crc Register containing the crc.
4052 * @param [in]val Register containing the byte to fold into the CRC.
4053 * @param [in]table Register containing the table of crc constants.
4054 *
4055 * uint32_t crc;
4056 * val = crc_table[(val ^ crc) & 0xFF];
4057 * crc = val ^ (crc >> 8);
4058 */
4059 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) {
4060 xor3(val, crc, val);
4061 and3(val, 0xFF, val);
4062 sllx(val, 2, val);
4063 lduw(table, val, val);
4064 srlx(crc, 8, crc);
4065 xor3(val, crc, crc);
4066 }
4067
4068 // Reverse byte order of lower 32 bits, assuming upper 32 bits all zeros
4069 void MacroAssembler::reverse_bytes_32(Register src, Register dst, Register tmp) {
4070 srlx(src, 24, dst);
4071
4072 sllx(src, 32+8, tmp);
4073 srlx(tmp, 32+24, tmp);
4074 sllx(tmp, 8, tmp);
4075 or3(dst, tmp, dst);
4076
4077 sllx(src, 32+16, tmp);
4078 srlx(tmp, 32+24, tmp);
4079 sllx(tmp, 16, tmp);
4080 or3(dst, tmp, dst);
4081
4082 sllx(src, 32+24, tmp);
4083 srlx(tmp, 32, tmp);
4084 or3(dst, tmp, dst);
4085 }
4086
4087 void MacroAssembler::movitof_revbytes(Register src, FloatRegister dst, Register tmp1, Register tmp2) {
4088 reverse_bytes_32(src, tmp1, tmp2);
4089 movxtod(tmp1, dst);
4090 }
4091
4092 void MacroAssembler::movftoi_revbytes(FloatRegister src, Register dst, Register tmp1, Register tmp2) {
4093 movdtox(src, tmp1);
4094 reverse_bytes_32(tmp1, dst, tmp2);
4095 }
4096
4097 void MacroAssembler::fold_128bit_crc32(Register xcrc_hi, Register xcrc_lo, Register xK_hi, Register xK_lo, Register xtmp_hi, Register xtmp_lo, Register buf, int offset) {
4098 xmulx(xcrc_hi, xK_hi, xtmp_lo);
4099 xmulxhi(xcrc_hi, xK_hi, xtmp_hi);
4100 xmulxhi(xcrc_lo, xK_lo, xcrc_hi);
4101 xmulx(xcrc_lo, xK_lo, xcrc_lo);
4102 xor3(xcrc_lo, xtmp_lo, xcrc_lo);
4103 xor3(xcrc_hi, xtmp_hi, xcrc_hi);
4104 ldxl(buf, G0, xtmp_lo);
4105 inc(buf, 8);
4106 ldxl(buf, G0, xtmp_hi);
4107 inc(buf, 8);
4108 xor3(xcrc_lo, xtmp_lo, xcrc_lo);
4109 xor3(xcrc_hi, xtmp_hi, xcrc_hi);
4110 }
4111
4112 void MacroAssembler::fold_128bit_crc32(Register xcrc_hi, Register xcrc_lo, Register xK_hi, Register xK_lo, Register xtmp_hi, Register xtmp_lo, Register xbuf_hi, Register xbuf_lo) {
4113 mov(xcrc_lo, xtmp_lo);
4114 mov(xcrc_hi, xtmp_hi);
4115 xmulx(xtmp_hi, xK_hi, xtmp_lo);
4116 xmulxhi(xtmp_hi, xK_hi, xtmp_hi);
4117 xmulxhi(xcrc_lo, xK_lo, xcrc_hi);
4118 xmulx(xcrc_lo, xK_lo, xcrc_lo);
4119 xor3(xcrc_lo, xbuf_lo, xcrc_lo);
4120 xor3(xcrc_hi, xbuf_hi, xcrc_hi);
4121 xor3(xcrc_lo, xtmp_lo, xcrc_lo);
4122 xor3(xcrc_hi, xtmp_hi, xcrc_hi);
4123 }
4124
4125 void MacroAssembler::fold_8bit_crc32(Register xcrc, Register table, Register xtmp, Register tmp) {
4126 and3(xcrc, 0xFF, tmp);
4127 sllx(tmp, 2, tmp);
4128 lduw(table, tmp, xtmp);
4129 srlx(xcrc, 8, xcrc);
4130 xor3(xtmp, xcrc, xcrc);
4131 }
4132
4133 void MacroAssembler::fold_8bit_crc32(Register crc, Register table, Register tmp) {
4134 and3(crc, 0xFF, tmp);
4135 srlx(crc, 8, crc);
4136 sllx(tmp, 2, tmp);
4137 lduw(table, tmp, tmp);
4138 xor3(tmp, crc, crc);
4139 }
4140
4141 #define CRC32_TMP_REG_NUM 18
4142
4143 #define CRC32_CONST_64 0x163cd6124
4144 #define CRC32_CONST_96 0x0ccaa009e
4145 #define CRC32_CONST_160 0x1751997d0
4146 #define CRC32_CONST_480 0x1c6e41596
4147 #define CRC32_CONST_544 0x154442bd4
4148
4149 void MacroAssembler::kernel_crc32(Register crc, Register buf, Register len, Register table) {
4150
4151 Label L_cleanup_loop, L_cleanup_check, L_align_loop, L_align_check;
4152 Label L_main_loop_prologue;
4153 Label L_fold_512b, L_fold_512b_loop, L_fold_128b;
4154 Label L_fold_tail, L_fold_tail_loop;
4155 Label L_8byte_fold_check;
4156
4157 const Register tmp[CRC32_TMP_REG_NUM] = {L0, L1, L2, L3, L4, L5, L6, G1, I0, I1, I2, I3, I4, I5, I7, O4, O5, G3};
4158
4159 Register const_64 = tmp[CRC32_TMP_REG_NUM-1];
4160 Register const_96 = tmp[CRC32_TMP_REG_NUM-1];
4161 Register const_160 = tmp[CRC32_TMP_REG_NUM-2];
4162 Register const_480 = tmp[CRC32_TMP_REG_NUM-1];
4163 Register const_544 = tmp[CRC32_TMP_REG_NUM-2];
4164
4165 set(ExternalAddress(StubRoutines::crc_table_addr()), table);
4166
4167 not1(crc); // ~c
4168 clruwu(crc); // clear upper 32 bits of crc
4169
4170 // Check if below cutoff, proceed directly to cleanup code
4171 mov(31, G4);
4172 cmp_and_br_short(len, G4, Assembler::lessEqualUnsigned, Assembler::pt, L_cleanup_check);
4173
4174 // Align buffer to 8 byte boundry
4175 mov(8, O5);
4176 and3(buf, 0x7, O4);
4177 sub(O5, O4, O5);
4178 and3(O5, 0x7, O5);
4179 sub(len, O5, len);
4180 ba(L_align_check);
4181 delayed()->nop();
4182
4183 // Alignment loop, table look up method for up to 7 bytes
4184 bind(L_align_loop);
4185 ldub(buf, 0, O4);
4186 inc(buf);
4187 dec(O5);
4188 xor3(O4, crc, O4);
4189 and3(O4, 0xFF, O4);
4190 sllx(O4, 2, O4);
4191 lduw(table, O4, O4);
4192 srlx(crc, 8, crc);
4193 xor3(O4, crc, crc);
4194 bind(L_align_check);
4195 nop();
4196 cmp_and_br_short(O5, 0, Assembler::notEqual, Assembler::pt, L_align_loop);
4197
4198 // Aligned on 64-bit (8-byte) boundry at this point
4199 // Check if still above cutoff (31-bytes)
4200 mov(31, G4);
4201 cmp_and_br_short(len, G4, Assembler::lessEqualUnsigned, Assembler::pt, L_cleanup_check);
4202 // At least 32 bytes left to process
4203
4204 // Free up registers by storing them to FP registers
4205 for (int i = 0; i < CRC32_TMP_REG_NUM; i++) {
4206 movxtod(tmp[i], as_FloatRegister(2*i));
4207 }
4208
4209 // Determine which loop to enter
4210 // Shared prologue
4211 ldxl(buf, G0, tmp[0]);
4212 inc(buf, 8);
4213 ldxl(buf, G0, tmp[1]);
4214 inc(buf, 8);
4215 xor3(tmp[0], crc, tmp[0]); // Fold CRC into first few bytes
4216 and3(crc, 0, crc); // Clear out the crc register
4217 // Main loop needs 128-bytes at least
4218 mov(128, G4);
4219 mov(64, tmp[2]);
4220 cmp_and_br_short(len, G4, Assembler::greaterEqualUnsigned, Assembler::pt, L_main_loop_prologue);
4221 // Less than 64 bytes
4222 nop();
4223 cmp_and_br_short(len, tmp[2], Assembler::lessUnsigned, Assembler::pt, L_fold_tail);
4224 // Between 64 and 127 bytes
4225 set64(CRC32_CONST_96, const_96, tmp[8]);
4226 set64(CRC32_CONST_160, const_160, tmp[9]);
4227 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[2], tmp[3], buf, 0);
4228 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[4], tmp[5], buf, 16);
4229 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[6], tmp[7], buf, 32);
4230 dec(len, 48);
4231 ba(L_fold_tail);
4232 delayed()->nop();
4233
4234 bind(L_main_loop_prologue);
4235 for (int i = 2; i < 8; i++) {
4236 ldxl(buf, G0, tmp[i]);
4237 inc(buf, 8);
4238 }
4239
4240 // Fold total 512 bits of polynomial on each iteration,
4241 // 128 bits per each of 4 parallel streams
4242 set64(CRC32_CONST_480, const_480, tmp[8]);
4243 set64(CRC32_CONST_544, const_544, tmp[9]);
4244
4245 mov(128, G4);
4246 bind(L_fold_512b_loop);
4247 fold_128bit_crc32(tmp[1], tmp[0], const_480, const_544, tmp[9], tmp[8], buf, 0);
4248 fold_128bit_crc32(tmp[3], tmp[2], const_480, const_544, tmp[11], tmp[10], buf, 16);
4249 fold_128bit_crc32(tmp[5], tmp[4], const_480, const_544, tmp[13], tmp[12], buf, 32);
4250 fold_128bit_crc32(tmp[7], tmp[6], const_480, const_544, tmp[15], tmp[14], buf, 64);
4251 dec(len, 64);
4252 cmp_and_br_short(len, G4, Assembler::greaterEqualUnsigned, Assembler::pt, L_fold_512b_loop);
4253
4254 // Fold 512 bits to 128 bits
4255 bind(L_fold_512b);
4256 set64(CRC32_CONST_96, const_96, tmp[8]);
4257 set64(CRC32_CONST_160, const_160, tmp[9]);
4258
4259 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[8], tmp[9], tmp[3], tmp[2]);
4260 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[8], tmp[9], tmp[5], tmp[4]);
4261 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[8], tmp[9], tmp[7], tmp[6]);
4262 dec(len, 48);
4263
4264 // Fold the rest of 128 bits data chunks
4265 bind(L_fold_tail);
4266 mov(32, G4);
4267 cmp_and_br_short(len, G4, Assembler::lessEqualUnsigned, Assembler::pt, L_fold_128b);
4268
4269 set64(CRC32_CONST_96, const_96, tmp[8]);
4270 set64(CRC32_CONST_160, const_160, tmp[9]);
4271
4272 bind(L_fold_tail_loop);
4273 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[2], tmp[3], buf, 0);
4274 sub(len, 16, len);
4275 cmp_and_br_short(len, G4, Assembler::greaterEqualUnsigned, Assembler::pt, L_fold_tail_loop);
4276
4277 // Fold the 128 bits in tmps 0 - 1 into tmp 1
4278 bind(L_fold_128b);
4279
4280 set64(CRC32_CONST_64, const_64, tmp[4]);
4281
4282 xmulx(const_64, tmp[0], tmp[2]);
4283 xmulxhi(const_64, tmp[0], tmp[3]);
4284
4285 srl(tmp[2], G0, tmp[4]);
4286 xmulx(const_64, tmp[4], tmp[4]);
4287
4288 srlx(tmp[2], 32, tmp[2]);
4289 sllx(tmp[3], 32, tmp[3]);
4290 or3(tmp[2], tmp[3], tmp[2]);
4291
4292 xor3(tmp[4], tmp[1], tmp[4]);
4293 xor3(tmp[4], tmp[2], tmp[1]);
4294 dec(len, 8);
4295
4296 // Use table lookup for the 8 bytes left in tmp[1]
4297 dec(len, 8);
4298
4299 // 8 8-bit folds to compute 32-bit CRC.
4300 for (int j = 0; j < 4; j++) {
4301 fold_8bit_crc32(tmp[1], table, tmp[2], tmp[3]);
4302 }
4303 srl(tmp[1], G0, crc); // move 32 bits to general register
4304 for (int j = 0; j < 4; j++) {
4305 fold_8bit_crc32(crc, table, tmp[3]);
4306 }
4307
4308 bind(L_8byte_fold_check);
4309
4310 // Restore int registers saved in FP registers
4311 for (int i = 0; i < CRC32_TMP_REG_NUM; i++) {
4312 movdtox(as_FloatRegister(2*i), tmp[i]);
4313 }
4314
4315 ba(L_cleanup_check);
4316 delayed()->nop();
4317
4318 // Table look-up method for the remaining few bytes
4319 bind(L_cleanup_loop);
4320 ldub(buf, 0, O4);
4321 inc(buf);
4322 dec(len);
4323 xor3(O4, crc, O4);
4324 and3(O4, 0xFF, O4);
4325 sllx(O4, 2, O4);
4326 lduw(table, O4, O4);
4327 srlx(crc, 8, crc);
4328 xor3(O4, crc, crc);
4329 bind(L_cleanup_check);
4330 nop();
4331 cmp_and_br_short(len, 0, Assembler::greaterUnsigned, Assembler::pt, L_cleanup_loop);
4332
4333 not1(crc);
4334 }
4335
4336 #define CHUNK_LEN 128 /* 128 x 8B = 1KB */
4337 #define CHUNK_K1 0x1307a0206 /* reverseBits(pow(x, CHUNK_LEN*8*8*3 - 32) mod P(x)) << 1 */
4338 #define CHUNK_K2 0x1a0f717c4 /* reverseBits(pow(x, CHUNK_LEN*8*8*2 - 32) mod P(x)) << 1 */
4339 #define CHUNK_K3 0x0170076fa /* reverseBits(pow(x, CHUNK_LEN*8*8*1 - 32) mod P(x)) << 1 */
4340
4341 void MacroAssembler::kernel_crc32c(Register crc, Register buf, Register len, Register table) {
4342
4343 Label L_crc32c_head, L_crc32c_aligned;
4344 Label L_crc32c_parallel, L_crc32c_parallel_loop;
4345 Label L_crc32c_serial, L_crc32c_x32_loop, L_crc32c_x8, L_crc32c_x8_loop;
4346 Label L_crc32c_done, L_crc32c_tail, L_crc32c_return;
4347
4348 set(ExternalAddress(StubRoutines::crc32c_table_addr()), table);
4349
4350 cmp_and_br_short(len, 0, Assembler::lessEqual, Assembler::pn, L_crc32c_return);
4351
4352 // clear upper 32 bits of crc
4353 clruwu(crc);
4354
4355 and3(buf, 7, G4);
4356 cmp_and_brx_short(G4, 0, Assembler::equal, Assembler::pt, L_crc32c_aligned);
4357
4358 mov(8, G1);
4359 sub(G1, G4, G4);
4360
4361 // ------ process the misaligned head (7 bytes or less) ------
4362 bind(L_crc32c_head);
4363
4364 // crc = (crc >>> 8) ^ byteTable[(crc ^ b) & 0xFF];
4365 ldub(buf, 0, G1);
4366 update_byte_crc32(crc, G1, table);
4367
4368 inc(buf);
4369 dec(len);
4370 cmp_and_br_short(len, 0, Assembler::equal, Assembler::pn, L_crc32c_return);
4371 dec(G4);
4372 cmp_and_br_short(G4, 0, Assembler::greater, Assembler::pt, L_crc32c_head);
4373
4374 // ------ process the 8-byte-aligned body ------
4375 bind(L_crc32c_aligned);
4376 nop();
4377 cmp_and_br_short(len, 8, Assembler::less, Assembler::pn, L_crc32c_tail);
4378
4379 // reverse the byte order of lower 32 bits to big endian, and move to FP side
4380 movitof_revbytes(crc, F0, G1, G3);
4381
4382 set(CHUNK_LEN*8*4, G4);
4383 cmp_and_br_short(len, G4, Assembler::less, Assembler::pt, L_crc32c_serial);
4384
4385 // ------ process four 1KB chunks in parallel ------
4386 bind(L_crc32c_parallel);
4387
4388 fzero(FloatRegisterImpl::D, F2);
4389 fzero(FloatRegisterImpl::D, F4);
4390 fzero(FloatRegisterImpl::D, F6);
4391
4392 mov(CHUNK_LEN - 1, G4);
4393 bind(L_crc32c_parallel_loop);
4394 // schedule ldf's ahead of crc32c's to hide the load-use latency
4395 ldf(FloatRegisterImpl::D, buf, 0, F8);
4396 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*8, F10);
4397 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*16, F12);
4398 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*24, F14);
4399 crc32c(F0, F8, F0);
4400 crc32c(F2, F10, F2);
4401 crc32c(F4, F12, F4);
4402 crc32c(F6, F14, F6);
4403 inc(buf, 8);
4404 dec(G4);
4405 cmp_and_br_short(G4, 0, Assembler::greater, Assembler::pt, L_crc32c_parallel_loop);
4406
4407 ldf(FloatRegisterImpl::D, buf, 0, F8);
4408 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*8, F10);
4409 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*16, F12);
4410 crc32c(F0, F8, F0);
4411 crc32c(F2, F10, F2);
4412 crc32c(F4, F12, F4);
4413
4414 inc(buf, CHUNK_LEN*24);
4415 ldfl(FloatRegisterImpl::D, buf, G0, F14); // load in little endian
4416 inc(buf, 8);
4417
4418 prefetch(buf, 0, Assembler::severalReads);
4419 prefetch(buf, CHUNK_LEN*8, Assembler::severalReads);
4420 prefetch(buf, CHUNK_LEN*16, Assembler::severalReads);
4421 prefetch(buf, CHUNK_LEN*24, Assembler::severalReads);
4422
4423 // move to INT side, and reverse the byte order of lower 32 bits to little endian
4424 movftoi_revbytes(F0, O4, G1, G4);
4425 movftoi_revbytes(F2, O5, G1, G4);
4426 movftoi_revbytes(F4, G5, G1, G4);
4427
4428 // combine the results of 4 chunks
4429 set64(CHUNK_K1, G3, G1);
4430 xmulx(O4, G3, O4);
4431 set64(CHUNK_K2, G3, G1);
4432 xmulx(O5, G3, O5);
4433 set64(CHUNK_K3, G3, G1);
4434 xmulx(G5, G3, G5);
4435
4436 movdtox(F14, G4);
4437 xor3(O4, O5, O5);
4438 xor3(G5, O5, O5);
4439 xor3(G4, O5, O5);
4440
4441 // reverse the byte order to big endian, via stack, and move to FP side
4442 // TODO: use new revb instruction
4443 add(SP, -8, G1);
4444 srlx(G1, 3, G1);
4445 sllx(G1, 3, G1);
4446 stx(O5, G1, G0);
4447 ldfl(FloatRegisterImpl::D, G1, G0, F2); // load in little endian
4448
4449 crc32c(F6, F2, F0);
4450
4451 set(CHUNK_LEN*8*4, G4);
4452 sub(len, G4, len);
4453 cmp_and_br_short(len, G4, Assembler::greaterEqual, Assembler::pt, L_crc32c_parallel);
4454 nop();
4455 cmp_and_br_short(len, 0, Assembler::equal, Assembler::pt, L_crc32c_done);
4456
4457 bind(L_crc32c_serial);
4458
4459 mov(32, G4);
4460 cmp_and_br_short(len, G4, Assembler::less, Assembler::pn, L_crc32c_x8);
4461
4462 // ------ process 32B chunks ------
4463 bind(L_crc32c_x32_loop);
4464 ldf(FloatRegisterImpl::D, buf, 0, F2);
4465 crc32c(F0, F2, F0);
4466 ldf(FloatRegisterImpl::D, buf, 8, F2);
4467 crc32c(F0, F2, F0);
4468 ldf(FloatRegisterImpl::D, buf, 16, F2);
4469 crc32c(F0, F2, F0);
4470 ldf(FloatRegisterImpl::D, buf, 24, F2);
4471 inc(buf, 32);
4472 crc32c(F0, F2, F0);
4473 dec(len, 32);
4474 cmp_and_br_short(len, G4, Assembler::greaterEqual, Assembler::pt, L_crc32c_x32_loop);
4475
4476 bind(L_crc32c_x8);
4477 nop();
4478 cmp_and_br_short(len, 8, Assembler::less, Assembler::pt, L_crc32c_done);
4479
4480 // ------ process 8B chunks ------
4481 bind(L_crc32c_x8_loop);
4482 ldf(FloatRegisterImpl::D, buf, 0, F2);
4483 inc(buf, 8);
4484 crc32c(F0, F2, F0);
4485 dec(len, 8);
4486 cmp_and_br_short(len, 8, Assembler::greaterEqual, Assembler::pt, L_crc32c_x8_loop);
4487
4488 bind(L_crc32c_done);
4489
4490 // move to INT side, and reverse the byte order of lower 32 bits to little endian
4491 movftoi_revbytes(F0, crc, G1, G3);
4492
4493 cmp_and_br_short(len, 0, Assembler::equal, Assembler::pt, L_crc32c_return);
4494
4495 // ------ process the misaligned tail (7 bytes or less) ------
4496 bind(L_crc32c_tail);
4497
4498 // crc = (crc >>> 8) ^ byteTable[(crc ^ b) & 0xFF];
4499 ldub(buf, 0, G1);
4500 update_byte_crc32(crc, G1, table);
4501
4502 inc(buf);
4503 dec(len);
4504 cmp_and_br_short(len, 0, Assembler::greater, Assembler::pt, L_crc32c_tail);
4505
4506 bind(L_crc32c_return);
4507 nop();
4508 }