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/klass.inline.hpp"
37 #include "prims/methodHandles.hpp"
38 #include "runtime/biasedLocking.hpp"
39 #include "runtime/flags/flagSetting.hpp"
40 #include "runtime/interfaceSupport.inline.hpp"
41 #include "runtime/jniHandles.inline.hpp"
42 #include "runtime/objectMonitor.hpp"
43 #include "runtime/os.inline.hpp"
44 #include "runtime/safepoint.hpp"
45 #include "runtime/safepointMechanism.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "runtime/stubRoutines.hpp"
48 #include "utilities/align.hpp"
49 #include "utilities/macros.hpp"
50 #ifdef COMPILER2
51 #include "opto/intrinsicnode.hpp"
52 #endif
53
54 #ifdef PRODUCT
55 #define BLOCK_COMMENT(str) /* nothing */
56 #define STOP(error) stop(error)
57 #else
58 #define BLOCK_COMMENT(str) block_comment(str)
59 #define STOP(error) block_comment(error); stop(error)
60 #endif
61
62 // Convert the raw encoding form into the form expected by the
63 // constructor for Address.
64 Address Address::make_raw(int base, int index, int scale, int disp, relocInfo::relocType disp_reloc) {
65 assert(scale == 0, "not supported");
66 RelocationHolder rspec;
67 if (disp_reloc != relocInfo::none) {
68 rspec = Relocation::spec_simple(disp_reloc);
69 }
70
71 Register rindex = as_Register(index);
72 if (rindex != G0) {
73 Address madr(as_Register(base), rindex);
74 madr._rspec = rspec;
75 return madr;
76 } else {
77 Address madr(as_Register(base), disp);
78 madr._rspec = rspec;
79 return madr;
80 }
81 }
82
83 Address Argument::address_in_frame() const {
84 // Warning: In LP64 mode disp will occupy more than 10 bits, but
85 // op codes such as ld or ldx, only access disp() to get
86 // their simm13 argument.
87 int disp = ((_number - Argument::n_register_parameters + frame::memory_parameter_word_sp_offset) * BytesPerWord) + STACK_BIAS;
88 if (is_in())
89 return Address(FP, disp); // In argument.
90 else
91 return Address(SP, disp); // Out argument.
92 }
93
94 static const char* argumentNames[][2] = {
95 {"A0","P0"}, {"A1","P1"}, {"A2","P2"}, {"A3","P3"}, {"A4","P4"},
96 {"A5","P5"}, {"A6","P6"}, {"A7","P7"}, {"A8","P8"}, {"A9","P9"},
97 {"A(n>9)","P(n>9)"}
98 };
99
100 const char* Argument::name() const {
101 int nofArgs = sizeof argumentNames / sizeof argumentNames[0];
102 int num = number();
103 if (num >= nofArgs) num = nofArgs - 1;
104 return argumentNames[num][is_in() ? 1 : 0];
105 }
106
107 #ifdef ASSERT
108 // On RISC, there's no benefit to verifying instruction boundaries.
109 bool AbstractAssembler::pd_check_instruction_mark() { return false; }
110 #endif
111
112 // Patch instruction inst at offset inst_pos to refer to dest_pos
113 // and return the resulting instruction.
114 // We should have pcs, not offsets, but since all is relative, it will work out
115 // OK.
116 int MacroAssembler::patched_branch(int dest_pos, int inst, int inst_pos) {
117 int m; // mask for displacement field
118 int v; // new value for displacement field
119 const int word_aligned_ones = -4;
120 switch (inv_op(inst)) {
121 default: ShouldNotReachHere();
122 case call_op: m = wdisp(word_aligned_ones, 0, 30); v = wdisp(dest_pos, inst_pos, 30); break;
123 case branch_op:
124 switch (inv_op2(inst)) {
125 case fbp_op2: m = wdisp( word_aligned_ones, 0, 19); v = wdisp( dest_pos, inst_pos, 19); break;
126 case bp_op2: m = wdisp( word_aligned_ones, 0, 19); v = wdisp( dest_pos, inst_pos, 19); break;
127 case fb_op2: m = wdisp( word_aligned_ones, 0, 22); v = wdisp( dest_pos, inst_pos, 22); break;
128 case br_op2: m = wdisp( word_aligned_ones, 0, 22); v = wdisp( dest_pos, inst_pos, 22); break;
129 case bpr_op2: {
130 if (is_cbcond(inst)) {
131 m = wdisp10(word_aligned_ones, 0);
132 v = wdisp10(dest_pos, inst_pos);
133 } else {
134 m = wdisp16(word_aligned_ones, 0);
135 v = wdisp16(dest_pos, inst_pos);
136 }
137 break;
138 }
139 default: ShouldNotReachHere();
140 }
141 }
142 return inst & ~m | v;
143 }
144
145 // Return the offset of the branch destionation of instruction inst
146 // at offset pos.
147 // Should have pcs, but since all is relative, it works out.
148 int MacroAssembler::branch_destination(int inst, int pos) {
149 int r;
150 switch (inv_op(inst)) {
151 default: ShouldNotReachHere();
152 case call_op: r = inv_wdisp(inst, pos, 30); break;
153 case branch_op:
154 switch (inv_op2(inst)) {
155 case fbp_op2: r = inv_wdisp( inst, pos, 19); break;
156 case bp_op2: r = inv_wdisp( inst, pos, 19); break;
157 case fb_op2: r = inv_wdisp( inst, pos, 22); break;
158 case br_op2: r = inv_wdisp( inst, pos, 22); break;
159 case bpr_op2: {
160 if (is_cbcond(inst)) {
161 r = inv_wdisp10(inst, pos);
162 } else {
163 r = inv_wdisp16(inst, pos);
164 }
165 break;
166 }
167 default: ShouldNotReachHere();
168 }
169 }
170 return r;
171 }
172
173 void MacroAssembler::resolve_jobject(Register value, Register tmp) {
174 Label done, not_weak;
175 br_null(value, false, Assembler::pn, done); // Use NULL as-is.
176 delayed()->andcc(value, JNIHandles::weak_tag_mask, G0); // Test for jweak
177 brx(Assembler::zero, true, Assembler::pt, not_weak);
178 delayed()->nop();
179 access_load_at(T_OBJECT, IN_NATIVE | ON_PHANTOM_OOP_REF,
180 Address(value, -JNIHandles::weak_tag_value), value, tmp);
181 verify_oop(value);
182 br (Assembler::always, true, Assembler::pt, done);
183 delayed()->nop();
184 bind(not_weak);
185 access_load_at(T_OBJECT, IN_NATIVE, Address(value, 0), value, tmp);
186 verify_oop(value);
187 bind(done);
188 }
189
190 void MacroAssembler::null_check(Register reg, int offset) {
191 if (needs_explicit_null_check((intptr_t)offset)) {
192 // provoke OS NULL exception if reg = NULL by
193 // accessing M[reg] w/o changing any registers
194 ld_ptr(reg, 0, G0);
195 }
196 else {
197 // nothing to do, (later) access of M[reg + offset]
198 // will provoke OS NULL exception if reg = NULL
199 }
200 }
201
202 // Ring buffer jumps
203
204
205 void MacroAssembler::jmp2(Register r1, Register r2, const char* file, int line ) {
206 assert_not_delayed();
207 jmpl(r1, r2, G0);
208 }
209 void MacroAssembler::jmp(Register r1, int offset, const char* file, int line ) {
210 assert_not_delayed();
211 jmp(r1, offset);
212 }
213
214 // This code sequence is relocatable to any address, even on LP64.
215 void MacroAssembler::jumpl(const AddressLiteral& addrlit, Register temp, Register d, int offset, const char* file, int line) {
216 assert_not_delayed();
217 // Force fixed length sethi because NativeJump and NativeFarCall don't handle
218 // variable length instruction streams.
219 patchable_sethi(addrlit, temp);
220 Address a(temp, addrlit.low10() + offset); // Add the offset to the displacement.
221 jmpl(a.base(), a.disp(), d);
222 }
223
224 void MacroAssembler::jump(const AddressLiteral& addrlit, Register temp, int offset, const char* file, int line) {
225 jumpl(addrlit, temp, G0, offset, file, line);
226 }
227
228
229 // Conditional breakpoint (for assertion checks in assembly code)
230 void MacroAssembler::breakpoint_trap(Condition c, CC cc) {
231 trap(c, cc, G0, ST_RESERVED_FOR_USER_0);
232 }
233
234 // We want to use ST_BREAKPOINT here, but the debugger is confused by it.
235 void MacroAssembler::breakpoint_trap() {
236 trap(ST_RESERVED_FOR_USER_0);
237 }
238
239 // Write serialization page so VM thread can do a pseudo remote membar
240 // We use the current thread pointer to calculate a thread specific
241 // offset to write to within the page. This minimizes bus traffic
242 // due to cache line collision.
243 void MacroAssembler::serialize_memory(Register thread, Register tmp1, Register tmp2) {
244 srl(thread, os::get_serialize_page_shift_count(), tmp2);
245 if (Assembler::is_simm13(os::vm_page_size())) {
246 and3(tmp2, (os::vm_page_size() - sizeof(int)), tmp2);
247 }
248 else {
249 set((os::vm_page_size() - sizeof(int)), tmp1);
250 and3(tmp2, tmp1, tmp2);
251 }
252 set(os::get_memory_serialize_page(), tmp1);
253 st(G0, tmp1, tmp2);
254 }
255
256
257 void MacroAssembler::safepoint_poll(Label& slow_path, bool a, Register thread_reg, Register temp_reg) {
258 if (SafepointMechanism::uses_thread_local_poll()) {
259 ldx(Address(thread_reg, Thread::polling_page_offset()), temp_reg, 0);
260 // Armed page has poll bit set.
261 and3(temp_reg, SafepointMechanism::poll_bit(), temp_reg);
262 br_notnull(temp_reg, a, Assembler::pn, slow_path);
263 } else {
264 AddressLiteral sync_state(SafepointSynchronize::address_of_state());
265
266 load_contents(sync_state, temp_reg);
267 cmp(temp_reg, SafepointSynchronize::_not_synchronized);
268 br(Assembler::notEqual, a, Assembler::pn, slow_path);
269 }
270 }
271
272 void MacroAssembler::enter() {
273 Unimplemented();
274 }
275
276 void MacroAssembler::leave() {
277 Unimplemented();
278 }
279
280 // Calls to C land
281
282 #ifdef ASSERT
283 // a hook for debugging
284 static Thread* reinitialize_thread() {
285 return Thread::current();
286 }
287 #else
288 #define reinitialize_thread Thread::current
289 #endif
290
291 #ifdef ASSERT
292 address last_get_thread = NULL;
293 #endif
294
295 // call this when G2_thread is not known to be valid
296 void MacroAssembler::get_thread() {
297 save_frame(0); // to avoid clobbering O0
298 mov(G1, L0); // avoid clobbering G1
299 mov(G5_method, L1); // avoid clobbering G5
300 mov(G3, L2); // avoid clobbering G3 also
301 mov(G4, L5); // avoid clobbering G4
302 #ifdef ASSERT
303 AddressLiteral last_get_thread_addrlit(&last_get_thread);
304 set(last_get_thread_addrlit, L3);
305 rdpc(L4);
306 inc(L4, 3 * BytesPerInstWord); // skip rdpc + inc + st_ptr to point L4 at call st_ptr(L4, L3, 0);
307 #endif
308 call(CAST_FROM_FN_PTR(address, reinitialize_thread), relocInfo::runtime_call_type);
309 delayed()->nop();
310 mov(L0, G1);
311 mov(L1, G5_method);
312 mov(L2, G3);
313 mov(L5, G4);
314 restore(O0, 0, G2_thread);
315 }
316
317 static Thread* verify_thread_subroutine(Thread* gthread_value) {
318 Thread* correct_value = Thread::current();
319 guarantee(gthread_value == correct_value, "G2_thread value must be the thread");
320 return correct_value;
321 }
322
323 void MacroAssembler::verify_thread() {
324 if (VerifyThread) {
325 // NOTE: this chops off the heads of the 64-bit O registers.
326 // make sure G2_thread contains the right value
327 save_frame_and_mov(0, Lmethod, Lmethod); // to avoid clobbering O0 (and propagate Lmethod)
328 mov(G1, L1); // avoid clobbering G1
329 // G2 saved below
330 mov(G3, L3); // avoid clobbering G3
331 mov(G4, L4); // avoid clobbering G4
332 mov(G5_method, L5); // avoid clobbering G5_method
333 call(CAST_FROM_FN_PTR(address,verify_thread_subroutine), relocInfo::runtime_call_type);
334 delayed()->mov(G2_thread, O0);
335
336 mov(L1, G1); // Restore G1
337 // G2 restored below
338 mov(L3, G3); // restore G3
339 mov(L4, G4); // restore G4
340 mov(L5, G5_method); // restore G5_method
341 restore(O0, 0, G2_thread);
342 }
343 }
344
345
346 void MacroAssembler::save_thread(const Register thread_cache) {
347 verify_thread();
348 if (thread_cache->is_valid()) {
349 assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
350 mov(G2_thread, thread_cache);
351 }
352 if (VerifyThread) {
353 // smash G2_thread, as if the VM were about to anyway
354 set(0x67676767, G2_thread);
355 }
356 }
357
358
359 void MacroAssembler::restore_thread(const Register thread_cache) {
360 if (thread_cache->is_valid()) {
361 assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
362 mov(thread_cache, G2_thread);
363 verify_thread();
364 } else {
365 // do it the slow way
366 get_thread();
367 }
368 }
369
370
371 // %%% maybe get rid of [re]set_last_Java_frame
372 void MacroAssembler::set_last_Java_frame(Register last_java_sp, Register last_Java_pc) {
373 assert_not_delayed();
374 Address flags(G2_thread, JavaThread::frame_anchor_offset() +
375 JavaFrameAnchor::flags_offset());
376 Address pc_addr(G2_thread, JavaThread::last_Java_pc_offset());
377
378 // Always set last_Java_pc and flags first because once last_Java_sp is visible
379 // has_last_Java_frame is true and users will look at the rest of the fields.
380 // (Note: flags should always be zero before we get here so doesn't need to be set.)
381
382 #ifdef ASSERT
383 // Verify that flags was zeroed on return to Java
384 Label PcOk;
385 save_frame(0); // to avoid clobbering O0
386 ld_ptr(pc_addr, L0);
387 br_null_short(L0, Assembler::pt, PcOk);
388 STOP("last_Java_pc not zeroed before leaving Java");
389 bind(PcOk);
390
391 // Verify that flags was zeroed on return to Java
392 Label FlagsOk;
393 ld(flags, L0);
394 tst(L0);
395 br(Assembler::zero, false, Assembler::pt, FlagsOk);
396 delayed() -> restore();
397 STOP("flags not zeroed before leaving Java");
398 bind(FlagsOk);
399 #endif /* ASSERT */
400 //
401 // When returning from calling out from Java mode the frame anchor's last_Java_pc
402 // will always be set to NULL. It is set here so that if we are doing a call to
403 // native (not VM) that we capture the known pc and don't have to rely on the
404 // native call having a standard frame linkage where we can find the pc.
405
406 if (last_Java_pc->is_valid()) {
407 st_ptr(last_Java_pc, pc_addr);
408 }
409
410 #ifdef ASSERT
411 // Make sure that we have an odd stack
412 Label StackOk;
413 andcc(last_java_sp, 0x01, G0);
414 br(Assembler::notZero, false, Assembler::pt, StackOk);
415 delayed()->nop();
416 STOP("Stack Not Biased in set_last_Java_frame");
417 bind(StackOk);
418 #endif // ASSERT
419 assert( last_java_sp != G4_scratch, "bad register usage in set_last_Java_frame");
420 add( last_java_sp, STACK_BIAS, G4_scratch );
421 st_ptr(G4_scratch, G2_thread, JavaThread::last_Java_sp_offset());
422 }
423
424 void MacroAssembler::reset_last_Java_frame(void) {
425 assert_not_delayed();
426
427 Address sp_addr(G2_thread, JavaThread::last_Java_sp_offset());
428 Address pc_addr(G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::last_Java_pc_offset());
429 Address flags (G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::flags_offset());
430
431 #ifdef ASSERT
432 // check that it WAS previously set
433 save_frame_and_mov(0, Lmethod, Lmethod); // Propagate Lmethod to helper frame
434 ld_ptr(sp_addr, L0);
435 tst(L0);
436 breakpoint_trap(Assembler::zero, Assembler::ptr_cc);
437 restore();
438 #endif // ASSERT
439
440 st_ptr(G0, sp_addr);
441 // Always return last_Java_pc to zero
442 st_ptr(G0, pc_addr);
443 // Always null flags after return to Java
444 st(G0, flags);
445 }
446
447
448 void MacroAssembler::call_VM_base(
449 Register oop_result,
450 Register thread_cache,
451 Register last_java_sp,
452 address entry_point,
453 int number_of_arguments,
454 bool check_exceptions)
455 {
456 assert_not_delayed();
457
458 // determine last_java_sp register
459 if (!last_java_sp->is_valid()) {
460 last_java_sp = SP;
461 }
462 // debugging support
463 assert(number_of_arguments >= 0 , "cannot have negative number of arguments");
464
465 // 64-bit last_java_sp is biased!
466 set_last_Java_frame(last_java_sp, noreg);
467 if (VerifyThread) mov(G2_thread, O0); // about to be smashed; pass early
468 save_thread(thread_cache);
469 // do the call
470 call(entry_point, relocInfo::runtime_call_type);
471 if (!VerifyThread)
472 delayed()->mov(G2_thread, O0); // pass thread as first argument
473 else
474 delayed()->nop(); // (thread already passed)
475 restore_thread(thread_cache);
476 reset_last_Java_frame();
477
478 // check for pending exceptions. use Gtemp as scratch register.
479 if (check_exceptions) {
480 check_and_forward_exception(Gtemp);
481 }
482
483 #ifdef ASSERT
484 set(badHeapWordVal, G3);
485 set(badHeapWordVal, G4);
486 set(badHeapWordVal, G5);
487 #endif
488
489 // get oop result if there is one and reset the value in the thread
490 if (oop_result->is_valid()) {
491 get_vm_result(oop_result);
492 }
493 }
494
495 void MacroAssembler::check_and_forward_exception(Register scratch_reg)
496 {
497 Label L;
498
499 check_and_handle_popframe(scratch_reg);
500 check_and_handle_earlyret(scratch_reg);
501
502 Address exception_addr(G2_thread, Thread::pending_exception_offset());
503 ld_ptr(exception_addr, scratch_reg);
504 br_null_short(scratch_reg, pt, L);
505 // we use O7 linkage so that forward_exception_entry has the issuing PC
506 call(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);
507 delayed()->nop();
508 bind(L);
509 }
510
511
512 void MacroAssembler::check_and_handle_popframe(Register scratch_reg) {
513 }
514
515
516 void MacroAssembler::check_and_handle_earlyret(Register scratch_reg) {
517 }
518
519
520 void MacroAssembler::call_VM(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) {
521 call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions);
522 }
523
524
525 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions) {
526 // O0 is reserved for the thread
527 mov(arg_1, O1);
528 call_VM(oop_result, entry_point, 1, check_exceptions);
529 }
530
531
532 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
533 // O0 is reserved for the thread
534 mov(arg_1, O1);
535 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
536 call_VM(oop_result, entry_point, 2, check_exceptions);
537 }
538
539
540 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions) {
541 // O0 is reserved for the thread
542 mov(arg_1, O1);
543 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
544 mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
545 call_VM(oop_result, entry_point, 3, check_exceptions);
546 }
547
548
549
550 // Note: The following call_VM overloadings are useful when a "save"
551 // has already been performed by a stub, and the last Java frame is
552 // the previous one. In that case, last_java_sp must be passed as FP
553 // instead of SP.
554
555
556 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, int number_of_arguments, bool check_exceptions) {
557 call_VM_base(oop_result, noreg, last_java_sp, entry_point, number_of_arguments, check_exceptions);
558 }
559
560
561 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions) {
562 // O0 is reserved for the thread
563 mov(arg_1, O1);
564 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions);
565 }
566
567
568 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
569 // O0 is reserved for the thread
570 mov(arg_1, O1);
571 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
572 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions);
573 }
574
575
576 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) {
577 // O0 is reserved for the thread
578 mov(arg_1, O1);
579 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
580 mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
581 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions);
582 }
583
584
585
586 void MacroAssembler::call_VM_leaf_base(Register thread_cache, address entry_point, int number_of_arguments) {
587 assert_not_delayed();
588 save_thread(thread_cache);
589 // do the call
590 call(entry_point, relocInfo::runtime_call_type);
591 delayed()->nop();
592 restore_thread(thread_cache);
593 #ifdef ASSERT
594 set(badHeapWordVal, G3);
595 set(badHeapWordVal, G4);
596 set(badHeapWordVal, G5);
597 #endif
598 }
599
600
601 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, int number_of_arguments) {
602 call_VM_leaf_base(thread_cache, entry_point, number_of_arguments);
603 }
604
605
606 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1) {
607 mov(arg_1, O0);
608 call_VM_leaf(thread_cache, entry_point, 1);
609 }
610
611
612 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2) {
613 mov(arg_1, O0);
614 mov(arg_2, O1); assert(arg_2 != O0, "smashed argument");
615 call_VM_leaf(thread_cache, entry_point, 2);
616 }
617
618
619 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2, Register arg_3) {
620 mov(arg_1, O0);
621 mov(arg_2, O1); assert(arg_2 != O0, "smashed argument");
622 mov(arg_3, O2); assert(arg_3 != O0 && arg_3 != O1, "smashed argument");
623 call_VM_leaf(thread_cache, entry_point, 3);
624 }
625
626
627 void MacroAssembler::get_vm_result(Register oop_result) {
628 verify_thread();
629 Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
630 ld_ptr( vm_result_addr, oop_result);
631 st_ptr(G0, vm_result_addr);
632 verify_oop(oop_result);
633 }
634
635
636 void MacroAssembler::get_vm_result_2(Register metadata_result) {
637 verify_thread();
638 Address vm_result_addr_2(G2_thread, JavaThread::vm_result_2_offset());
639 ld_ptr(vm_result_addr_2, metadata_result);
640 st_ptr(G0, vm_result_addr_2);
641 }
642
643
644 // We require that C code which does not return a value in vm_result will
645 // leave it undisturbed.
646 void MacroAssembler::set_vm_result(Register oop_result) {
647 verify_thread();
648 Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
649 verify_oop(oop_result);
650
651 # ifdef ASSERT
652 // Check that we are not overwriting any other oop.
653 save_frame_and_mov(0, Lmethod, Lmethod); // Propagate Lmethod
654 ld_ptr(vm_result_addr, L0);
655 tst(L0);
656 restore();
657 breakpoint_trap(notZero, Assembler::ptr_cc);
658 // }
659 # endif
660
661 st_ptr(oop_result, vm_result_addr);
662 }
663
664
665 void MacroAssembler::ic_call(address entry, bool emit_delay, jint method_index) {
666 RelocationHolder rspec = virtual_call_Relocation::spec(pc(), method_index);
667 patchable_set((intptr_t)Universe::non_oop_word(), G5_inline_cache_reg);
668 relocate(rspec);
669 call(entry, relocInfo::none);
670 if (emit_delay) {
671 delayed()->nop();
672 }
673 }
674
675
676 void MacroAssembler::internal_sethi(const AddressLiteral& addrlit, Register d, bool ForceRelocatable) {
677 address save_pc;
678 int shiftcnt;
679 #ifdef VALIDATE_PIPELINE
680 assert_no_delay("Cannot put two instructions in delay-slot.");
681 #endif
682 v9_dep();
683 save_pc = pc();
684
685 int msb32 = (int) (addrlit.value() >> 32);
686 int lsb32 = (int) (addrlit.value());
687
688 if (msb32 == 0 && lsb32 >= 0) {
689 Assembler::sethi(lsb32, d, addrlit.rspec());
690 }
691 else if (msb32 == -1) {
692 Assembler::sethi(~lsb32, d, addrlit.rspec());
693 xor3(d, ~low10(~0), d);
694 }
695 else {
696 Assembler::sethi(msb32, d, addrlit.rspec()); // msb 22-bits
697 if (msb32 & 0x3ff) // Any bits?
698 or3(d, msb32 & 0x3ff, d); // msb 32-bits are now in lsb 32
699 if (lsb32 & 0xFFFFFC00) { // done?
700 if ((lsb32 >> 20) & 0xfff) { // Any bits set?
701 sllx(d, 12, d); // Make room for next 12 bits
702 or3(d, (lsb32 >> 20) & 0xfff, d); // Or in next 12
703 shiftcnt = 0; // We already shifted
704 }
705 else
706 shiftcnt = 12;
707 if ((lsb32 >> 10) & 0x3ff) {
708 sllx(d, shiftcnt + 10, d); // Make room for last 10 bits
709 or3(d, (lsb32 >> 10) & 0x3ff, d); // Or in next 10
710 shiftcnt = 0;
711 }
712 else
713 shiftcnt = 10;
714 sllx(d, shiftcnt + 10, d); // Shift leaving disp field 0'd
715 }
716 else
717 sllx(d, 32, d);
718 }
719 // Pad out the instruction sequence so it can be patched later.
720 if (ForceRelocatable || (addrlit.rtype() != relocInfo::none &&
721 addrlit.rtype() != relocInfo::runtime_call_type)) {
722 while (pc() < (save_pc + (7 * BytesPerInstWord)))
723 nop();
724 }
725 }
726
727
728 void MacroAssembler::sethi(const AddressLiteral& addrlit, Register d) {
729 internal_sethi(addrlit, d, false);
730 }
731
732
733 void MacroAssembler::patchable_sethi(const AddressLiteral& addrlit, Register d) {
734 internal_sethi(addrlit, d, true);
735 }
736
737
738 int MacroAssembler::insts_for_sethi(address a, bool worst_case) {
739 if (worst_case) return 7;
740 intptr_t iaddr = (intptr_t) a;
741 int msb32 = (int) (iaddr >> 32);
742 int lsb32 = (int) (iaddr);
743 int count;
744 if (msb32 == 0 && lsb32 >= 0)
745 count = 1;
746 else if (msb32 == -1)
747 count = 2;
748 else {
749 count = 2;
750 if (msb32 & 0x3ff)
751 count++;
752 if (lsb32 & 0xFFFFFC00 ) {
753 if ((lsb32 >> 20) & 0xfff) count += 2;
754 if ((lsb32 >> 10) & 0x3ff) count += 2;
755 }
756 }
757 return count;
758 }
759
760 int MacroAssembler::worst_case_insts_for_set() {
761 return insts_for_sethi(NULL, true) + 1;
762 }
763
764
765 // Keep in sync with MacroAssembler::insts_for_internal_set
766 void MacroAssembler::internal_set(const AddressLiteral& addrlit, Register d, bool ForceRelocatable) {
767 intptr_t value = addrlit.value();
768
769 if (!ForceRelocatable && addrlit.rspec().type() == relocInfo::none) {
770 // can optimize
771 if (-4096 <= value && value <= 4095) {
772 or3(G0, value, d); // setsw (this leaves upper 32 bits sign-extended)
773 return;
774 }
775 if (inv_hi22(hi22(value)) == value) {
776 sethi(addrlit, d);
777 return;
778 }
779 }
780 assert_no_delay("Cannot put two instructions in delay-slot.");
781 internal_sethi(addrlit, d, ForceRelocatable);
782 if (ForceRelocatable || addrlit.rspec().type() != relocInfo::none || addrlit.low10() != 0) {
783 add(d, addrlit.low10(), d, addrlit.rspec());
784 }
785 }
786
787 // Keep in sync with MacroAssembler::internal_set
788 int MacroAssembler::insts_for_internal_set(intptr_t value) {
789 // can optimize
790 if (-4096 <= value && value <= 4095) {
791 return 1;
792 }
793 if (inv_hi22(hi22(value)) == value) {
794 return insts_for_sethi((address) value);
795 }
796 int count = insts_for_sethi((address) value);
797 AddressLiteral al(value);
798 if (al.low10() != 0) {
799 count++;
800 }
801 return count;
802 }
803
804 void MacroAssembler::set(const AddressLiteral& al, Register d) {
805 internal_set(al, d, false);
806 }
807
808 void MacroAssembler::set(intptr_t value, Register d) {
809 AddressLiteral al(value);
810 internal_set(al, d, false);
811 }
812
813 void MacroAssembler::set(address addr, Register d, RelocationHolder const& rspec) {
814 AddressLiteral al(addr, rspec);
815 internal_set(al, d, false);
816 }
817
818 void MacroAssembler::patchable_set(const AddressLiteral& al, Register d) {
819 internal_set(al, d, true);
820 }
821
822 void MacroAssembler::patchable_set(intptr_t value, Register d) {
823 AddressLiteral al(value);
824 internal_set(al, d, true);
825 }
826
827
828 void MacroAssembler::set64(jlong value, Register d, Register tmp) {
829 assert_not_delayed();
830 v9_dep();
831
832 int hi = (int)(value >> 32);
833 int lo = (int)(value & ~0);
834 int bits_33to2 = (int)((value >> 2) & ~0);
835 // (Matcher::isSimpleConstant64 knows about the following optimizations.)
836 if (Assembler::is_simm13(lo) && value == lo) {
837 or3(G0, lo, d);
838 } else if (hi == 0) {
839 Assembler::sethi(lo, d); // hardware version zero-extends to upper 32
840 if (low10(lo) != 0)
841 or3(d, low10(lo), d);
842 }
843 else if ((hi >> 2) == 0) {
844 Assembler::sethi(bits_33to2, d); // hardware version zero-extends to upper 32
845 sllx(d, 2, d);
846 if (low12(lo) != 0)
847 or3(d, low12(lo), d);
848 }
849 else if (hi == -1) {
850 Assembler::sethi(~lo, d); // hardware version zero-extends to upper 32
851 xor3(d, low10(lo) ^ ~low10(~0), d);
852 }
853 else if (lo == 0) {
854 if (Assembler::is_simm13(hi)) {
855 or3(G0, hi, d);
856 } else {
857 Assembler::sethi(hi, d); // hardware version zero-extends to upper 32
858 if (low10(hi) != 0)
859 or3(d, low10(hi), d);
860 }
861 sllx(d, 32, d);
862 }
863 else {
864 Assembler::sethi(hi, tmp);
865 Assembler::sethi(lo, d); // macro assembler version sign-extends
866 if (low10(hi) != 0)
867 or3 (tmp, low10(hi), tmp);
868 if (low10(lo) != 0)
869 or3 ( d, low10(lo), d);
870 sllx(tmp, 32, tmp);
871 or3 (d, tmp, d);
872 }
873 }
874
875 int MacroAssembler::insts_for_set64(jlong value) {
876 v9_dep();
877
878 int hi = (int) (value >> 32);
879 int lo = (int) (value & ~0);
880 int count = 0;
881
882 // (Matcher::isSimpleConstant64 knows about the following optimizations.)
883 if (Assembler::is_simm13(lo) && value == lo) {
884 count++;
885 } else if (hi == 0) {
886 count++;
887 if (low10(lo) != 0)
888 count++;
889 }
890 else if (hi == -1) {
891 count += 2;
892 }
893 else if (lo == 0) {
894 if (Assembler::is_simm13(hi)) {
895 count++;
896 } else {
897 count++;
898 if (low10(hi) != 0)
899 count++;
900 }
901 count++;
902 }
903 else {
904 count += 2;
905 if (low10(hi) != 0)
906 count++;
907 if (low10(lo) != 0)
908 count++;
909 count += 2;
910 }
911 return count;
912 }
913
914 // compute size in bytes of sparc frame, given
915 // number of extraWords
916 int MacroAssembler::total_frame_size_in_bytes(int extraWords) {
917
918 int nWords = frame::memory_parameter_word_sp_offset;
919
920 nWords += extraWords;
921
922 if (nWords & 1) ++nWords; // round up to double-word
923
924 return nWords * BytesPerWord;
925 }
926
927
928 // save_frame: given number of "extra" words in frame,
929 // issue approp. save instruction (p 200, v8 manual)
930
931 void MacroAssembler::save_frame(int extraWords) {
932 int delta = -total_frame_size_in_bytes(extraWords);
933 if (is_simm13(delta)) {
934 save(SP, delta, SP);
935 } else {
936 set(delta, G3_scratch);
937 save(SP, G3_scratch, SP);
938 }
939 }
940
941
942 void MacroAssembler::save_frame_c1(int size_in_bytes) {
943 if (is_simm13(-size_in_bytes)) {
944 save(SP, -size_in_bytes, SP);
945 } else {
946 set(-size_in_bytes, G3_scratch);
947 save(SP, G3_scratch, SP);
948 }
949 }
950
951
952 void MacroAssembler::save_frame_and_mov(int extraWords,
953 Register s1, Register d1,
954 Register s2, Register d2) {
955 assert_not_delayed();
956
957 // The trick here is to use precisely the same memory word
958 // that trap handlers also use to save the register.
959 // This word cannot be used for any other purpose, but
960 // it works fine to save the register's value, whether or not
961 // an interrupt flushes register windows at any given moment!
962 Address s1_addr;
963 if (s1->is_valid() && (s1->is_in() || s1->is_local())) {
964 s1_addr = s1->address_in_saved_window();
965 st_ptr(s1, s1_addr);
966 }
967
968 Address s2_addr;
969 if (s2->is_valid() && (s2->is_in() || s2->is_local())) {
970 s2_addr = s2->address_in_saved_window();
971 st_ptr(s2, s2_addr);
972 }
973
974 save_frame(extraWords);
975
976 if (s1_addr.base() == SP) {
977 ld_ptr(s1_addr.after_save(), d1);
978 } else if (s1->is_valid()) {
979 mov(s1->after_save(), d1);
980 }
981
982 if (s2_addr.base() == SP) {
983 ld_ptr(s2_addr.after_save(), d2);
984 } else if (s2->is_valid()) {
985 mov(s2->after_save(), d2);
986 }
987 }
988
989
990 AddressLiteral MacroAssembler::allocate_metadata_address(Metadata* obj) {
991 assert(oop_recorder() != NULL, "this assembler needs a Recorder");
992 int index = oop_recorder()->allocate_metadata_index(obj);
993 RelocationHolder rspec = metadata_Relocation::spec(index);
994 return AddressLiteral((address)obj, rspec);
995 }
996
997 AddressLiteral MacroAssembler::constant_metadata_address(Metadata* obj) {
998 assert(oop_recorder() != NULL, "this assembler needs a Recorder");
999 int index = oop_recorder()->find_index(obj);
1000 RelocationHolder rspec = metadata_Relocation::spec(index);
1001 return AddressLiteral((address)obj, rspec);
1002 }
1003
1004
1005 AddressLiteral MacroAssembler::constant_oop_address(jobject obj) {
1006 #ifdef ASSERT
1007 {
1008 ThreadInVMfromUnknown tiv;
1009 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1010 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "not an oop");
1011 }
1012 #endif
1013 int oop_index = oop_recorder()->find_index(obj);
1014 return AddressLiteral(obj, oop_Relocation::spec(oop_index));
1015 }
1016
1017 void MacroAssembler::set_narrow_oop(jobject obj, Register d) {
1018 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1019 int oop_index = oop_recorder()->find_index(obj);
1020 RelocationHolder rspec = oop_Relocation::spec(oop_index);
1021
1022 assert_not_delayed();
1023 // Relocation with special format (see relocInfo_sparc.hpp).
1024 relocate(rspec, 1);
1025 // Assembler::sethi(0x3fffff, d);
1026 emit_int32( op(branch_op) | rd(d) | op2(sethi_op2) | hi22(0x3fffff) );
1027 // Don't add relocation for 'add'. Do patching during 'sethi' processing.
1028 add(d, 0x3ff, d);
1029
1030 }
1031
1032 void MacroAssembler::set_narrow_klass(Klass* k, Register d) {
1033 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1034 int klass_index = oop_recorder()->find_index(k);
1035 RelocationHolder rspec = metadata_Relocation::spec(klass_index);
1036 narrowOop encoded_k = Klass::encode_klass(k);
1037
1038 assert_not_delayed();
1039 // Relocation with special format (see relocInfo_sparc.hpp).
1040 relocate(rspec, 1);
1041 // Assembler::sethi(encoded_k, d);
1042 emit_int32( op(branch_op) | rd(d) | op2(sethi_op2) | hi22(encoded_k) );
1043 // Don't add relocation for 'add'. Do patching during 'sethi' processing.
1044 add(d, low10(encoded_k), d);
1045
1046 }
1047
1048 void MacroAssembler::align(int modulus) {
1049 while (offset() % modulus != 0) nop();
1050 }
1051
1052 void RegistersForDebugging::print(outputStream* s) {
1053 FlagSetting fs(Debugging, true);
1054 int j;
1055 for (j = 0; j < 8; ++j) {
1056 if (j != 6) { s->print("i%d = ", j); os::print_location(s, i[j]); }
1057 else { s->print( "fp = " ); os::print_location(s, i[j]); }
1058 }
1059 s->cr();
1060
1061 for (j = 0; j < 8; ++j) {
1062 s->print("l%d = ", j); os::print_location(s, l[j]);
1063 }
1064 s->cr();
1065
1066 for (j = 0; j < 8; ++j) {
1067 if (j != 6) { s->print("o%d = ", j); os::print_location(s, o[j]); }
1068 else { s->print( "sp = " ); os::print_location(s, o[j]); }
1069 }
1070 s->cr();
1071
1072 for (j = 0; j < 8; ++j) {
1073 s->print("g%d = ", j); os::print_location(s, g[j]);
1074 }
1075 s->cr();
1076
1077 // print out floats with compression
1078 for (j = 0; j < 32; ) {
1079 jfloat val = f[j];
1080 int last = j;
1081 for ( ; last+1 < 32; ++last ) {
1082 char b1[1024], b2[1024];
1083 sprintf(b1, "%f", val);
1084 sprintf(b2, "%f", f[last+1]);
1085 if (strcmp(b1, b2))
1086 break;
1087 }
1088 s->print("f%d", j);
1089 if ( j != last ) s->print(" - f%d", last);
1090 s->print(" = %f", val);
1091 s->fill_to(25);
1092 s->print_cr(" (0x%x)", *(int*)&val);
1093 j = last + 1;
1094 }
1095 s->cr();
1096
1097 // and doubles (evens only)
1098 for (j = 0; j < 32; ) {
1099 jdouble val = d[j];
1100 int last = j;
1101 for ( ; last+1 < 32; ++last ) {
1102 char b1[1024], b2[1024];
1103 sprintf(b1, "%f", val);
1104 sprintf(b2, "%f", d[last+1]);
1105 if (strcmp(b1, b2))
1106 break;
1107 }
1108 s->print("d%d", 2 * j);
1109 if ( j != last ) s->print(" - d%d", last);
1110 s->print(" = %f", val);
1111 s->fill_to(30);
1112 s->print("(0x%x)", *(int*)&val);
1113 s->fill_to(42);
1114 s->print_cr("(0x%x)", *(1 + (int*)&val));
1115 j = last + 1;
1116 }
1117 s->cr();
1118 }
1119
1120 void RegistersForDebugging::save_registers(MacroAssembler* a) {
1121 a->sub(FP, align_up(sizeof(RegistersForDebugging), sizeof(jdouble)) - STACK_BIAS, O0);
1122 a->flushw();
1123 int i;
1124 for (i = 0; i < 8; ++i) {
1125 a->ld_ptr(as_iRegister(i)->address_in_saved_window().after_save(), L1); a->st_ptr( L1, O0, i_offset(i));
1126 a->ld_ptr(as_lRegister(i)->address_in_saved_window().after_save(), L1); a->st_ptr( L1, O0, l_offset(i));
1127 a->st_ptr(as_oRegister(i)->after_save(), O0, o_offset(i));
1128 a->st_ptr(as_gRegister(i)->after_save(), O0, g_offset(i));
1129 }
1130 for (i = 0; i < 32; ++i) {
1131 a->stf(FloatRegisterImpl::S, as_FloatRegister(i), O0, f_offset(i));
1132 }
1133 for (i = 0; i < 64; i += 2) {
1134 a->stf(FloatRegisterImpl::D, as_FloatRegister(i), O0, d_offset(i));
1135 }
1136 }
1137
1138 void RegistersForDebugging::restore_registers(MacroAssembler* a, Register r) {
1139 for (int i = 1; i < 8; ++i) {
1140 a->ld_ptr(r, g_offset(i), as_gRegister(i));
1141 }
1142 for (int j = 0; j < 32; ++j) {
1143 a->ldf(FloatRegisterImpl::S, O0, f_offset(j), as_FloatRegister(j));
1144 }
1145 for (int k = 0; k < 64; k += 2) {
1146 a->ldf(FloatRegisterImpl::D, O0, d_offset(k), as_FloatRegister(k));
1147 }
1148 }
1149
1150
1151 // pushes double TOS element of FPU stack on CPU stack; pops from FPU stack
1152 void MacroAssembler::push_fTOS() {
1153 // %%%%%% need to implement this
1154 }
1155
1156 // pops double TOS element from CPU stack and pushes on FPU stack
1157 void MacroAssembler::pop_fTOS() {
1158 // %%%%%% need to implement this
1159 }
1160
1161 void MacroAssembler::empty_FPU_stack() {
1162 // %%%%%% need to implement this
1163 }
1164
1165 void MacroAssembler::_verify_oop(Register reg, const char* msg, const char * file, int line) {
1166 // plausibility check for oops
1167 if (!VerifyOops) return;
1168
1169 if (reg == G0) return; // always NULL, which is always an oop
1170
1171 BLOCK_COMMENT("verify_oop {");
1172 char buffer[64];
1173 #ifdef COMPILER1
1174 if (CommentedAssembly) {
1175 snprintf(buffer, sizeof(buffer), "verify_oop at %d", offset());
1176 block_comment(buffer);
1177 }
1178 #endif
1179
1180 const char* real_msg = NULL;
1181 {
1182 ResourceMark rm;
1183 stringStream ss;
1184 ss.print("%s at offset %d (%s:%d)", msg, offset(), file, line);
1185 real_msg = code_string(ss.as_string());
1186 }
1187
1188 // Call indirectly to solve generation ordering problem
1189 AddressLiteral a(StubRoutines::verify_oop_subroutine_entry_address());
1190
1191 // Make some space on stack above the current register window.
1192 // Enough to hold 8 64-bit registers.
1193 add(SP,-8*8,SP);
1194
1195 // Save some 64-bit registers; a normal 'save' chops the heads off
1196 // of 64-bit longs in the 32-bit build.
1197 stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
1198 stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
1199 mov(reg,O0); // Move arg into O0; arg might be in O7 which is about to be crushed
1200 stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
1201
1202 // Size of set() should stay the same
1203 patchable_set((intptr_t)real_msg, O1);
1204 // Load address to call to into O7
1205 load_ptr_contents(a, O7);
1206 // Register call to verify_oop_subroutine
1207 callr(O7, G0);
1208 delayed()->nop();
1209 // recover frame size
1210 add(SP, 8*8,SP);
1211 BLOCK_COMMENT("} verify_oop");
1212 }
1213
1214 void MacroAssembler::_verify_oop_addr(Address addr, const char* msg, const char * file, int line) {
1215 // plausibility check for oops
1216 if (!VerifyOops) return;
1217
1218 const char* real_msg = NULL;
1219 {
1220 ResourceMark rm;
1221 stringStream ss;
1222 ss.print("%s at SP+%d (%s:%d)", msg, addr.disp(), file, line);
1223 real_msg = code_string(ss.as_string());
1224 }
1225
1226 // Call indirectly to solve generation ordering problem
1227 AddressLiteral a(StubRoutines::verify_oop_subroutine_entry_address());
1228
1229 // Make some space on stack above the current register window.
1230 // Enough to hold 8 64-bit registers.
1231 add(SP,-8*8,SP);
1232
1233 // Save some 64-bit registers; a normal 'save' chops the heads off
1234 // of 64-bit longs in the 32-bit build.
1235 stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
1236 stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
1237 ld_ptr(addr.base(), addr.disp() + 8*8, O0); // Load arg into O0; arg might be in O7 which is about to be crushed
1238 stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
1239
1240 // Size of set() should stay the same
1241 patchable_set((intptr_t)real_msg, O1);
1242 // Load address to call to into O7
1243 load_ptr_contents(a, O7);
1244 // Register call to verify_oop_subroutine
1245 callr(O7, G0);
1246 delayed()->nop();
1247 // recover frame size
1248 add(SP, 8*8,SP);
1249 }
1250
1251 // side-door communication with signalHandler in os_solaris.cpp
1252 address MacroAssembler::_verify_oop_implicit_branch[3] = { NULL };
1253
1254 // This macro is expanded just once; it creates shared code. Contract:
1255 // receives an oop in O0. Must restore O0 & O7 from TLS. Must not smash ANY
1256 // registers, including flags. May not use a register 'save', as this blows
1257 // the high bits of the O-regs if they contain Long values. Acts as a 'leaf'
1258 // call.
1259 void MacroAssembler::verify_oop_subroutine() {
1260 // Leaf call; no frame.
1261 Label succeed, fail, null_or_fail;
1262
1263 // O0 and O7 were saved already (O0 in O0's TLS home, O7 in O5's TLS home).
1264 // O0 is now the oop to be checked. O7 is the return address.
1265 Register O0_obj = O0;
1266
1267 // Save some more registers for temps.
1268 stx(O2,SP,frame::register_save_words*wordSize+STACK_BIAS+2*8);
1269 stx(O3,SP,frame::register_save_words*wordSize+STACK_BIAS+3*8);
1270 stx(O4,SP,frame::register_save_words*wordSize+STACK_BIAS+4*8);
1271 stx(O5,SP,frame::register_save_words*wordSize+STACK_BIAS+5*8);
1272
1273 // Save flags
1274 Register O5_save_flags = O5;
1275 rdccr( O5_save_flags );
1276
1277 { // count number of verifies
1278 Register O2_adr = O2;
1279 Register O3_accum = O3;
1280 inc_counter(StubRoutines::verify_oop_count_addr(), O2_adr, O3_accum);
1281 }
1282
1283 Register O2_mask = O2;
1284 Register O3_bits = O3;
1285 Register O4_temp = O4;
1286
1287 // mark lower end of faulting range
1288 assert(_verify_oop_implicit_branch[0] == NULL, "set once");
1289 _verify_oop_implicit_branch[0] = pc();
1290
1291 // We can't check the mark oop because it could be in the process of
1292 // locking or unlocking while this is running.
1293 set(Universe::verify_oop_mask (), O2_mask);
1294 set(Universe::verify_oop_bits (), O3_bits);
1295
1296 // assert((obj & oop_mask) == oop_bits);
1297 and3(O0_obj, O2_mask, O4_temp);
1298 cmp_and_brx_short(O4_temp, O3_bits, notEqual, pn, null_or_fail);
1299
1300 if ((NULL_WORD & Universe::verify_oop_mask()) == Universe::verify_oop_bits()) {
1301 // the null_or_fail case is useless; must test for null separately
1302 br_null_short(O0_obj, pn, succeed);
1303 }
1304
1305 // Check the Klass* of this object for being in the right area of memory.
1306 // Cannot do the load in the delay above slot in case O0 is null
1307 load_klass(O0_obj, O0_obj);
1308 // assert((klass != NULL)
1309 br_null_short(O0_obj, pn, fail);
1310
1311 wrccr( O5_save_flags ); // Restore CCR's
1312
1313 // mark upper end of faulting range
1314 _verify_oop_implicit_branch[1] = pc();
1315
1316 //-----------------------
1317 // all tests pass
1318 bind(succeed);
1319
1320 // Restore prior 64-bit registers
1321 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+0*8,O0);
1322 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+1*8,O1);
1323 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+2*8,O2);
1324 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+3*8,O3);
1325 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+4*8,O4);
1326 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+5*8,O5);
1327
1328 retl(); // Leaf return; restore prior O7 in delay slot
1329 delayed()->ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+7*8,O7);
1330
1331 //-----------------------
1332 bind(null_or_fail); // nulls are less common but OK
1333 br_null(O0_obj, false, pt, succeed);
1334 delayed()->wrccr( O5_save_flags ); // Restore CCR's
1335
1336 //-----------------------
1337 // report failure:
1338 bind(fail);
1339 _verify_oop_implicit_branch[2] = pc();
1340
1341 wrccr( O5_save_flags ); // Restore CCR's
1342
1343 save_frame(align_up(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1344
1345 // stop_subroutine expects message pointer in I1.
1346 mov(I1, O1);
1347
1348 // Restore prior 64-bit registers
1349 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+0*8,I0);
1350 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+1*8,I1);
1351 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+2*8,I2);
1352 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+3*8,I3);
1353 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+4*8,I4);
1354 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+5*8,I5);
1355
1356 // factor long stop-sequence into subroutine to save space
1357 assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
1358
1359 // call indirectly to solve generation ordering problem
1360 AddressLiteral al(StubRoutines::Sparc::stop_subroutine_entry_address());
1361 load_ptr_contents(al, O5);
1362 jmpl(O5, 0, O7);
1363 delayed()->nop();
1364 }
1365
1366
1367 void MacroAssembler::stop(const char* msg) {
1368 // save frame first to get O7 for return address
1369 // add one word to size in case struct is odd number of words long
1370 // It must be doubleword-aligned for storing doubles into it.
1371
1372 save_frame(align_up(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1373
1374 // stop_subroutine expects message pointer in I1.
1375 // Size of set() should stay the same
1376 patchable_set((intptr_t)msg, O1);
1377
1378 // factor long stop-sequence into subroutine to save space
1379 assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
1380
1381 // call indirectly to solve generation ordering problem
1382 AddressLiteral a(StubRoutines::Sparc::stop_subroutine_entry_address());
1383 load_ptr_contents(a, O5);
1384 jmpl(O5, 0, O7);
1385 delayed()->nop();
1386
1387 breakpoint_trap(); // make stop actually stop rather than writing
1388 // unnoticeable results in the output files.
1389
1390 // restore(); done in callee to save space!
1391 }
1392
1393
1394 void MacroAssembler::warn(const char* msg) {
1395 save_frame(align_up(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1396 RegistersForDebugging::save_registers(this);
1397 mov(O0, L0);
1398 // Size of set() should stay the same
1399 patchable_set((intptr_t)msg, O0);
1400 call( CAST_FROM_FN_PTR(address, warning) );
1401 delayed()->nop();
1402 // ret();
1403 // delayed()->restore();
1404 RegistersForDebugging::restore_registers(this, L0);
1405 restore();
1406 }
1407
1408
1409 void MacroAssembler::untested(const char* what) {
1410 // We must be able to turn interactive prompting off
1411 // in order to run automated test scripts on the VM
1412 // Use the flag ShowMessageBoxOnError
1413
1414 const char* b = NULL;
1415 {
1416 ResourceMark rm;
1417 stringStream ss;
1418 ss.print("untested: %s", what);
1419 b = code_string(ss.as_string());
1420 }
1421 if (ShowMessageBoxOnError) { STOP(b); }
1422 else { warn(b); }
1423 }
1424
1425
1426 void MacroAssembler::unimplemented(const char* what) {
1427 const char* buf = NULL;
1428 {
1429 ResourceMark rm;
1430 stringStream ss;
1431 ss.print("unimplemented: %s", what);
1432 buf = code_string(ss.as_string());
1433 }
1434 stop(buf);
1435 }
1436
1437
1438 void MacroAssembler::stop_subroutine() {
1439 RegistersForDebugging::save_registers(this);
1440
1441 // for the sake of the debugger, stick a PC on the current frame
1442 // (this assumes that the caller has performed an extra "save")
1443 mov(I7, L7);
1444 add(O7, -7 * BytesPerInt, I7);
1445
1446 save_frame(); // one more save to free up another O7 register
1447 mov(I0, O1); // addr of reg save area
1448
1449 // We expect pointer to message in I1. Caller must set it up in O1
1450 mov(I1, O0); // get msg
1451 call (CAST_FROM_FN_PTR(address, MacroAssembler::debug), relocInfo::runtime_call_type);
1452 delayed()->nop();
1453
1454 restore();
1455
1456 RegistersForDebugging::restore_registers(this, O0);
1457
1458 save_frame(0);
1459 call(CAST_FROM_FN_PTR(address,breakpoint));
1460 delayed()->nop();
1461 restore();
1462
1463 mov(L7, I7);
1464 retl();
1465 delayed()->restore(); // see stop above
1466 }
1467
1468
1469 void MacroAssembler::debug(char* msg, RegistersForDebugging* regs) {
1470 if ( ShowMessageBoxOnError ) {
1471 JavaThread* thread = JavaThread::current();
1472 JavaThreadState saved_state = thread->thread_state();
1473 thread->set_thread_state(_thread_in_vm);
1474 {
1475 // In order to get locks work, we need to fake a in_VM state
1476 ttyLocker ttyl;
1477 ::tty->print_cr("EXECUTION STOPPED: %s\n", msg);
1478 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
1479 BytecodeCounter::print();
1480 }
1481 if (os::message_box(msg, "Execution stopped, print registers?"))
1482 regs->print(::tty);
1483 }
1484 BREAKPOINT;
1485 ThreadStateTransition::transition(JavaThread::current(), _thread_in_vm, saved_state);
1486 }
1487 else {
1488 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", msg);
1489 }
1490 assert(false, "DEBUG MESSAGE: %s", msg);
1491 }
1492
1493
1494 void MacroAssembler::calc_mem_param_words(Register Rparam_words, Register Rresult) {
1495 subcc( Rparam_words, Argument::n_register_parameters, Rresult); // how many mem words?
1496 Label no_extras;
1497 br( negative, true, pt, no_extras ); // if neg, clear reg
1498 delayed()->set(0, Rresult); // annuled, so only if taken
1499 bind( no_extras );
1500 }
1501
1502
1503 void MacroAssembler::calc_frame_size(Register Rextra_words, Register Rresult) {
1504 add(Rextra_words, frame::memory_parameter_word_sp_offset, Rresult);
1505 bclr(1, Rresult);
1506 sll(Rresult, LogBytesPerWord, Rresult); // Rresult has total frame bytes
1507 }
1508
1509
1510 void MacroAssembler::calc_frame_size_and_save(Register Rextra_words, Register Rresult) {
1511 calc_frame_size(Rextra_words, Rresult);
1512 neg(Rresult);
1513 save(SP, Rresult, SP);
1514 }
1515
1516
1517 // ---------------------------------------------------------
1518 Assembler::RCondition cond2rcond(Assembler::Condition c) {
1519 switch (c) {
1520 /*case zero: */
1521 case Assembler::equal: return Assembler::rc_z;
1522 case Assembler::lessEqual: return Assembler::rc_lez;
1523 case Assembler::less: return Assembler::rc_lz;
1524 /*case notZero:*/
1525 case Assembler::notEqual: return Assembler::rc_nz;
1526 case Assembler::greater: return Assembler::rc_gz;
1527 case Assembler::greaterEqual: return Assembler::rc_gez;
1528 }
1529 ShouldNotReachHere();
1530 return Assembler::rc_z;
1531 }
1532
1533 // compares (32 bit) register with zero and branches. NOT FOR USE WITH 64-bit POINTERS
1534 void MacroAssembler::cmp_zero_and_br(Condition c, Register s1, Label& L, bool a, Predict p) {
1535 tst(s1);
1536 br (c, a, p, L);
1537 }
1538
1539 // Compares a pointer register with zero and branches on null.
1540 // Does a test & branch on 32-bit systems and a register-branch on 64-bit.
1541 void MacroAssembler::br_null( Register s1, bool a, Predict p, Label& L ) {
1542 assert_not_delayed();
1543 bpr( rc_z, a, p, s1, L );
1544 }
1545
1546 void MacroAssembler::br_notnull( Register s1, bool a, Predict p, Label& L ) {
1547 assert_not_delayed();
1548 bpr( rc_nz, a, p, s1, L );
1549 }
1550
1551 // Compare registers and branch with nop in delay slot or cbcond without delay slot.
1552
1553 // Compare integer (32 bit) values (icc only).
1554 void MacroAssembler::cmp_and_br_short(Register s1, Register s2, Condition c,
1555 Predict p, Label& L) {
1556 assert_not_delayed();
1557 if (use_cbcond(L)) {
1558 Assembler::cbcond(c, icc, s1, s2, L);
1559 } else {
1560 cmp(s1, s2);
1561 br(c, false, p, L);
1562 delayed()->nop();
1563 }
1564 }
1565
1566 // Compare integer (32 bit) values (icc only).
1567 void MacroAssembler::cmp_and_br_short(Register s1, int simm13a, Condition c,
1568 Predict p, Label& L) {
1569 assert_not_delayed();
1570 if (is_simm(simm13a,5) && use_cbcond(L)) {
1571 Assembler::cbcond(c, icc, s1, simm13a, L);
1572 } else {
1573 cmp(s1, simm13a);
1574 br(c, false, p, L);
1575 delayed()->nop();
1576 }
1577 }
1578
1579 // Branch that tests xcc in LP64 and icc in !LP64
1580 void MacroAssembler::cmp_and_brx_short(Register s1, Register s2, Condition c,
1581 Predict p, Label& L) {
1582 assert_not_delayed();
1583 if (use_cbcond(L)) {
1584 Assembler::cbcond(c, ptr_cc, s1, s2, L);
1585 } else {
1586 cmp(s1, s2);
1587 brx(c, false, p, L);
1588 delayed()->nop();
1589 }
1590 }
1591
1592 // Branch that tests xcc in LP64 and icc in !LP64
1593 void MacroAssembler::cmp_and_brx_short(Register s1, int simm13a, Condition c,
1594 Predict p, Label& L) {
1595 assert_not_delayed();
1596 if (is_simm(simm13a,5) && use_cbcond(L)) {
1597 Assembler::cbcond(c, ptr_cc, s1, simm13a, L);
1598 } else {
1599 cmp(s1, simm13a);
1600 brx(c, false, p, L);
1601 delayed()->nop();
1602 }
1603 }
1604
1605 // Short branch version for compares a pointer with zero.
1606
1607 void MacroAssembler::br_null_short(Register s1, Predict p, Label& L) {
1608 assert_not_delayed();
1609 if (use_cbcond(L)) {
1610 Assembler::cbcond(zero, ptr_cc, s1, 0, L);
1611 } else {
1612 br_null(s1, false, p, L);
1613 delayed()->nop();
1614 }
1615 }
1616
1617 void MacroAssembler::br_notnull_short(Register s1, Predict p, Label& L) {
1618 assert_not_delayed();
1619 if (use_cbcond(L)) {
1620 Assembler::cbcond(notZero, ptr_cc, s1, 0, L);
1621 } else {
1622 br_notnull(s1, false, p, L);
1623 delayed()->nop();
1624 }
1625 }
1626
1627 // Unconditional short branch
1628 void MacroAssembler::ba_short(Label& L) {
1629 assert_not_delayed();
1630 if (use_cbcond(L)) {
1631 Assembler::cbcond(equal, icc, G0, G0, L);
1632 } else {
1633 br(always, false, pt, L);
1634 delayed()->nop();
1635 }
1636 }
1637
1638 // Branch if 'icc' says zero or not (i.e. icc.z == 1|0).
1639
1640 void MacroAssembler::br_icc_zero(bool iszero, Predict p, Label &L) {
1641 assert_not_delayed();
1642 Condition cf = (iszero ? Assembler::zero : Assembler::notZero);
1643 br(cf, false, p, L);
1644 delayed()->nop();
1645 }
1646
1647 // instruction sequences factored across compiler & interpreter
1648
1649
1650 void MacroAssembler::lcmp( Register Ra_hi, Register Ra_low,
1651 Register Rb_hi, Register Rb_low,
1652 Register Rresult) {
1653
1654 Label check_low_parts, done;
1655
1656 cmp(Ra_hi, Rb_hi ); // compare hi parts
1657 br(equal, true, pt, check_low_parts);
1658 delayed()->cmp(Ra_low, Rb_low); // test low parts
1659
1660 // And, with an unsigned comparison, it does not matter if the numbers
1661 // are negative or not.
1662 // E.g., -2 cmp -1: the low parts are 0xfffffffe and 0xffffffff.
1663 // The second one is bigger (unsignedly).
1664
1665 // Other notes: The first move in each triplet can be unconditional
1666 // (and therefore probably prefetchable).
1667 // And the equals case for the high part does not need testing,
1668 // since that triplet is reached only after finding the high halves differ.
1669
1670 mov(-1, Rresult);
1671 ba(done);
1672 delayed()->movcc(greater, false, icc, 1, Rresult);
1673
1674 bind(check_low_parts);
1675
1676 mov( -1, Rresult);
1677 movcc(equal, false, icc, 0, Rresult);
1678 movcc(greaterUnsigned, false, icc, 1, Rresult);
1679
1680 bind(done);
1681 }
1682
1683 void MacroAssembler::lneg( Register Rhi, Register Rlow ) {
1684 subcc( G0, Rlow, Rlow );
1685 subc( G0, Rhi, Rhi );
1686 }
1687
1688 void MacroAssembler::lshl( Register Rin_high, Register Rin_low,
1689 Register Rcount,
1690 Register Rout_high, Register Rout_low,
1691 Register Rtemp ) {
1692
1693
1694 Register Ralt_count = Rtemp;
1695 Register Rxfer_bits = Rtemp;
1696
1697 assert( Ralt_count != Rin_high
1698 && Ralt_count != Rin_low
1699 && Ralt_count != Rcount
1700 && Rxfer_bits != Rin_low
1701 && Rxfer_bits != Rin_high
1702 && Rxfer_bits != Rcount
1703 && Rxfer_bits != Rout_low
1704 && Rout_low != Rin_high,
1705 "register alias checks");
1706
1707 Label big_shift, done;
1708
1709 // This code can be optimized to use the 64 bit shifts in V9.
1710 // Here we use the 32 bit shifts.
1711
1712 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
1713 subcc(Rcount, 31, Ralt_count);
1714 br(greater, true, pn, big_shift);
1715 delayed()->dec(Ralt_count);
1716
1717 // shift < 32 bits, Ralt_count = Rcount-31
1718
1719 // We get the transfer bits by shifting right by 32-count the low
1720 // register. This is done by shifting right by 31-count and then by one
1721 // more to take care of the special (rare) case where count is zero
1722 // (shifting by 32 would not work).
1723
1724 neg(Ralt_count);
1725
1726 // The order of the next two instructions is critical in the case where
1727 // Rin and Rout are the same and should not be reversed.
1728
1729 srl(Rin_low, Ralt_count, Rxfer_bits); // shift right by 31-count
1730 if (Rcount != Rout_low) {
1731 sll(Rin_low, Rcount, Rout_low); // low half
1732 }
1733 sll(Rin_high, Rcount, Rout_high);
1734 if (Rcount == Rout_low) {
1735 sll(Rin_low, Rcount, Rout_low); // low half
1736 }
1737 srl(Rxfer_bits, 1, Rxfer_bits ); // shift right by one more
1738 ba(done);
1739 delayed()->or3(Rout_high, Rxfer_bits, Rout_high); // new hi value: or in shifted old hi part and xfer from low
1740
1741 // shift >= 32 bits, Ralt_count = Rcount-32
1742 bind(big_shift);
1743 sll(Rin_low, Ralt_count, Rout_high );
1744 clr(Rout_low);
1745
1746 bind(done);
1747 }
1748
1749
1750 void MacroAssembler::lshr( Register Rin_high, Register Rin_low,
1751 Register Rcount,
1752 Register Rout_high, Register Rout_low,
1753 Register Rtemp ) {
1754
1755 Register Ralt_count = Rtemp;
1756 Register Rxfer_bits = Rtemp;
1757
1758 assert( Ralt_count != Rin_high
1759 && Ralt_count != Rin_low
1760 && Ralt_count != Rcount
1761 && Rxfer_bits != Rin_low
1762 && Rxfer_bits != Rin_high
1763 && Rxfer_bits != Rcount
1764 && Rxfer_bits != Rout_high
1765 && Rout_high != Rin_low,
1766 "register alias checks");
1767
1768 Label big_shift, done;
1769
1770 // This code can be optimized to use the 64 bit shifts in V9.
1771 // Here we use the 32 bit shifts.
1772
1773 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
1774 subcc(Rcount, 31, Ralt_count);
1775 br(greater, true, pn, big_shift);
1776 delayed()->dec(Ralt_count);
1777
1778 // shift < 32 bits, Ralt_count = Rcount-31
1779
1780 // We get the transfer bits by shifting left by 32-count the high
1781 // register. This is done by shifting left by 31-count and then by one
1782 // more to take care of the special (rare) case where count is zero
1783 // (shifting by 32 would not work).
1784
1785 neg(Ralt_count);
1786 if (Rcount != Rout_low) {
1787 srl(Rin_low, Rcount, Rout_low);
1788 }
1789
1790 // The order of the next two instructions is critical in the case where
1791 // Rin and Rout are the same and should not be reversed.
1792
1793 sll(Rin_high, Ralt_count, Rxfer_bits); // shift left by 31-count
1794 sra(Rin_high, Rcount, Rout_high ); // high half
1795 sll(Rxfer_bits, 1, Rxfer_bits); // shift left by one more
1796 if (Rcount == Rout_low) {
1797 srl(Rin_low, Rcount, Rout_low);
1798 }
1799 ba(done);
1800 delayed()->or3(Rout_low, Rxfer_bits, Rout_low); // new low value: or shifted old low part and xfer from high
1801
1802 // shift >= 32 bits, Ralt_count = Rcount-32
1803 bind(big_shift);
1804
1805 sra(Rin_high, Ralt_count, Rout_low);
1806 sra(Rin_high, 31, Rout_high); // sign into hi
1807
1808 bind( done );
1809 }
1810
1811
1812
1813 void MacroAssembler::lushr( Register Rin_high, Register Rin_low,
1814 Register Rcount,
1815 Register Rout_high, Register Rout_low,
1816 Register Rtemp ) {
1817
1818 Register Ralt_count = Rtemp;
1819 Register Rxfer_bits = Rtemp;
1820
1821 assert( Ralt_count != Rin_high
1822 && Ralt_count != Rin_low
1823 && Ralt_count != Rcount
1824 && Rxfer_bits != Rin_low
1825 && Rxfer_bits != Rin_high
1826 && Rxfer_bits != Rcount
1827 && Rxfer_bits != Rout_high
1828 && Rout_high != Rin_low,
1829 "register alias checks");
1830
1831 Label big_shift, done;
1832
1833 // This code can be optimized to use the 64 bit shifts in V9.
1834 // Here we use the 32 bit shifts.
1835
1836 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
1837 subcc(Rcount, 31, Ralt_count);
1838 br(greater, true, pn, big_shift);
1839 delayed()->dec(Ralt_count);
1840
1841 // shift < 32 bits, Ralt_count = Rcount-31
1842
1843 // We get the transfer bits by shifting left by 32-count the high
1844 // register. This is done by shifting left by 31-count and then by one
1845 // more to take care of the special (rare) case where count is zero
1846 // (shifting by 32 would not work).
1847
1848 neg(Ralt_count);
1849 if (Rcount != Rout_low) {
1850 srl(Rin_low, Rcount, Rout_low);
1851 }
1852
1853 // The order of the next two instructions is critical in the case where
1854 // Rin and Rout are the same and should not be reversed.
1855
1856 sll(Rin_high, Ralt_count, Rxfer_bits); // shift left by 31-count
1857 srl(Rin_high, Rcount, Rout_high ); // high half
1858 sll(Rxfer_bits, 1, Rxfer_bits); // shift left by one more
1859 if (Rcount == Rout_low) {
1860 srl(Rin_low, Rcount, Rout_low);
1861 }
1862 ba(done);
1863 delayed()->or3(Rout_low, Rxfer_bits, Rout_low); // new low value: or shifted old low part and xfer from high
1864
1865 // shift >= 32 bits, Ralt_count = Rcount-32
1866 bind(big_shift);
1867
1868 srl(Rin_high, Ralt_count, Rout_low);
1869 clr(Rout_high);
1870
1871 bind( done );
1872 }
1873
1874 void MacroAssembler::lcmp( Register Ra, Register Rb, Register Rresult) {
1875 cmp(Ra, Rb);
1876 mov(-1, Rresult);
1877 movcc(equal, false, xcc, 0, Rresult);
1878 movcc(greater, false, xcc, 1, Rresult);
1879 }
1880
1881
1882 void MacroAssembler::load_sized_value(Address src, Register dst, size_t size_in_bytes, bool is_signed) {
1883 switch (size_in_bytes) {
1884 case 8: ld_long(src, dst); break;
1885 case 4: ld( src, dst); break;
1886 case 2: is_signed ? ldsh(src, dst) : lduh(src, dst); break;
1887 case 1: is_signed ? ldsb(src, dst) : ldub(src, dst); break;
1888 default: ShouldNotReachHere();
1889 }
1890 }
1891
1892 void MacroAssembler::store_sized_value(Register src, Address dst, size_t size_in_bytes) {
1893 switch (size_in_bytes) {
1894 case 8: st_long(src, dst); break;
1895 case 4: st( src, dst); break;
1896 case 2: sth( src, dst); break;
1897 case 1: stb( src, dst); break;
1898 default: ShouldNotReachHere();
1899 }
1900 }
1901
1902
1903 void MacroAssembler::float_cmp( bool is_float, int unordered_result,
1904 FloatRegister Fa, FloatRegister Fb,
1905 Register Rresult) {
1906 if (is_float) {
1907 fcmp(FloatRegisterImpl::S, fcc0, Fa, Fb);
1908 } else {
1909 fcmp(FloatRegisterImpl::D, fcc0, Fa, Fb);
1910 }
1911
1912 if (unordered_result == 1) {
1913 mov( -1, Rresult);
1914 movcc(f_equal, true, fcc0, 0, Rresult);
1915 movcc(f_unorderedOrGreater, true, fcc0, 1, Rresult);
1916 } else {
1917 mov( -1, Rresult);
1918 movcc(f_equal, true, fcc0, 0, Rresult);
1919 movcc(f_greater, true, fcc0, 1, Rresult);
1920 }
1921 }
1922
1923
1924 void MacroAssembler::save_all_globals_into_locals() {
1925 mov(G1,L1);
1926 mov(G2,L2);
1927 mov(G3,L3);
1928 mov(G4,L4);
1929 mov(G5,L5);
1930 mov(G6,L6);
1931 mov(G7,L7);
1932 }
1933
1934 void MacroAssembler::restore_globals_from_locals() {
1935 mov(L1,G1);
1936 mov(L2,G2);
1937 mov(L3,G3);
1938 mov(L4,G4);
1939 mov(L5,G5);
1940 mov(L6,G6);
1941 mov(L7,G7);
1942 }
1943
1944 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr,
1945 Register tmp,
1946 int offset) {
1947 intptr_t value = *delayed_value_addr;
1948 if (value != 0)
1949 return RegisterOrConstant(value + offset);
1950
1951 // load indirectly to solve generation ordering problem
1952 AddressLiteral a(delayed_value_addr);
1953 load_ptr_contents(a, tmp);
1954
1955 #ifdef ASSERT
1956 tst(tmp);
1957 breakpoint_trap(zero, xcc);
1958 #endif
1959
1960 if (offset != 0)
1961 add(tmp, offset, tmp);
1962
1963 return RegisterOrConstant(tmp);
1964 }
1965
1966
1967 RegisterOrConstant MacroAssembler::regcon_andn_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
1968 assert(d.register_or_noreg() != G0, "lost side effect");
1969 if ((s2.is_constant() && s2.as_constant() == 0) ||
1970 (s2.is_register() && s2.as_register() == G0)) {
1971 // Do nothing, just move value.
1972 if (s1.is_register()) {
1973 if (d.is_constant()) d = temp;
1974 mov(s1.as_register(), d.as_register());
1975 return d;
1976 } else {
1977 return s1;
1978 }
1979 }
1980
1981 if (s1.is_register()) {
1982 assert_different_registers(s1.as_register(), temp);
1983 if (d.is_constant()) d = temp;
1984 andn(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
1985 return d;
1986 } else {
1987 if (s2.is_register()) {
1988 assert_different_registers(s2.as_register(), temp);
1989 if (d.is_constant()) d = temp;
1990 set(s1.as_constant(), temp);
1991 andn(temp, s2.as_register(), d.as_register());
1992 return d;
1993 } else {
1994 intptr_t res = s1.as_constant() & ~s2.as_constant();
1995 return res;
1996 }
1997 }
1998 }
1999
2000 RegisterOrConstant MacroAssembler::regcon_inc_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
2001 assert(d.register_or_noreg() != G0, "lost side effect");
2002 if ((s2.is_constant() && s2.as_constant() == 0) ||
2003 (s2.is_register() && s2.as_register() == G0)) {
2004 // Do nothing, just move value.
2005 if (s1.is_register()) {
2006 if (d.is_constant()) d = temp;
2007 mov(s1.as_register(), d.as_register());
2008 return d;
2009 } else {
2010 return s1;
2011 }
2012 }
2013
2014 if (s1.is_register()) {
2015 assert_different_registers(s1.as_register(), temp);
2016 if (d.is_constant()) d = temp;
2017 add(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
2018 return d;
2019 } else {
2020 if (s2.is_register()) {
2021 assert_different_registers(s2.as_register(), temp);
2022 if (d.is_constant()) d = temp;
2023 add(s2.as_register(), ensure_simm13_or_reg(s1, temp), d.as_register());
2024 return d;
2025 } else {
2026 intptr_t res = s1.as_constant() + s2.as_constant();
2027 return res;
2028 }
2029 }
2030 }
2031
2032 RegisterOrConstant MacroAssembler::regcon_sll_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
2033 assert(d.register_or_noreg() != G0, "lost side effect");
2034 if (!is_simm13(s2.constant_or_zero()))
2035 s2 = (s2.as_constant() & 0xFF);
2036 if ((s2.is_constant() && s2.as_constant() == 0) ||
2037 (s2.is_register() && s2.as_register() == G0)) {
2038 // Do nothing, just move value.
2039 if (s1.is_register()) {
2040 if (d.is_constant()) d = temp;
2041 mov(s1.as_register(), d.as_register());
2042 return d;
2043 } else {
2044 return s1;
2045 }
2046 }
2047
2048 if (s1.is_register()) {
2049 assert_different_registers(s1.as_register(), temp);
2050 if (d.is_constant()) d = temp;
2051 sll_ptr(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
2052 return d;
2053 } else {
2054 if (s2.is_register()) {
2055 assert_different_registers(s2.as_register(), temp);
2056 if (d.is_constant()) d = temp;
2057 set(s1.as_constant(), temp);
2058 sll_ptr(temp, s2.as_register(), d.as_register());
2059 return d;
2060 } else {
2061 intptr_t res = s1.as_constant() << s2.as_constant();
2062 return res;
2063 }
2064 }
2065 }
2066
2067
2068 // Look up the method for a megamorphic invokeinterface call.
2069 // The target method is determined by <intf_klass, itable_index>.
2070 // The receiver klass is in recv_klass.
2071 // On success, the result will be in method_result, and execution falls through.
2072 // On failure, execution transfers to the given label.
2073 void MacroAssembler::lookup_interface_method(Register recv_klass,
2074 Register intf_klass,
2075 RegisterOrConstant itable_index,
2076 Register method_result,
2077 Register scan_temp,
2078 Register sethi_temp,
2079 Label& L_no_such_interface,
2080 bool return_method) {
2081 assert_different_registers(recv_klass, intf_klass, method_result, scan_temp);
2082 assert(!return_method || itable_index.is_constant() || itable_index.as_register() == method_result,
2083 "caller must use same register for non-constant itable index as for method");
2084
2085 Label L_no_such_interface_restore;
2086 bool did_save = false;
2087 if (scan_temp == noreg || sethi_temp == noreg) {
2088 Register recv_2 = recv_klass->is_global() ? recv_klass : L0;
2089 Register intf_2 = intf_klass->is_global() ? intf_klass : L1;
2090 assert(method_result->is_global(), "must be able to return value");
2091 scan_temp = L2;
2092 sethi_temp = L3;
2093 save_frame_and_mov(0, recv_klass, recv_2, intf_klass, intf_2);
2094 recv_klass = recv_2;
2095 intf_klass = intf_2;
2096 did_save = true;
2097 }
2098
2099 // Compute start of first itableOffsetEntry (which is at the end of the vtable)
2100 int vtable_base = in_bytes(Klass::vtable_start_offset());
2101 int scan_step = itableOffsetEntry::size() * wordSize;
2102 int vte_size = vtableEntry::size_in_bytes();
2103
2104 lduw(recv_klass, in_bytes(Klass::vtable_length_offset()), scan_temp);
2105 // %%% We should store the aligned, prescaled offset in the klassoop.
2106 // Then the next several instructions would fold away.
2107
2108 int itb_offset = vtable_base;
2109 int itb_scale = exact_log2(vtableEntry::size_in_bytes());
2110 sll(scan_temp, itb_scale, scan_temp);
2111 add(scan_temp, itb_offset, scan_temp);
2112 add(recv_klass, scan_temp, scan_temp);
2113
2114 if (return_method) {
2115 // Adjust recv_klass by scaled itable_index, so we can free itable_index.
2116 RegisterOrConstant itable_offset = itable_index;
2117 itable_offset = regcon_sll_ptr(itable_index, exact_log2(itableMethodEntry::size() * wordSize), itable_offset);
2118 itable_offset = regcon_inc_ptr(itable_offset, itableMethodEntry::method_offset_in_bytes(), itable_offset);
2119 add(recv_klass, ensure_simm13_or_reg(itable_offset, sethi_temp), recv_klass);
2120 }
2121
2122 // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) {
2123 // if (scan->interface() == intf) {
2124 // result = (klass + scan->offset() + itable_index);
2125 // }
2126 // }
2127 Label L_search, L_found_method;
2128
2129 for (int peel = 1; peel >= 0; peel--) {
2130 // %%%% Could load both offset and interface in one ldx, if they were
2131 // in the opposite order. This would save a load.
2132 ld_ptr(scan_temp, itableOffsetEntry::interface_offset_in_bytes(), method_result);
2133
2134 // Check that this entry is non-null. A null entry means that
2135 // the receiver class doesn't implement the interface, and wasn't the
2136 // same as when the caller was compiled.
2137 bpr(Assembler::rc_z, false, Assembler::pn, method_result, did_save ? L_no_such_interface_restore : L_no_such_interface);
2138 delayed()->cmp(method_result, intf_klass);
2139
2140 if (peel) {
2141 brx(Assembler::equal, false, Assembler::pt, L_found_method);
2142 } else {
2143 brx(Assembler::notEqual, false, Assembler::pn, L_search);
2144 // (invert the test to fall through to found_method...)
2145 }
2146 delayed()->add(scan_temp, scan_step, scan_temp);
2147
2148 if (!peel) break;
2149
2150 bind(L_search);
2151 }
2152
2153 bind(L_found_method);
2154
2155 if (return_method) {
2156 // Got a hit.
2157 int ito_offset = itableOffsetEntry::offset_offset_in_bytes();
2158 // scan_temp[-scan_step] points to the vtable offset we need
2159 ito_offset -= scan_step;
2160 lduw(scan_temp, ito_offset, scan_temp);
2161 ld_ptr(recv_klass, scan_temp, method_result);
2162 }
2163
2164 if (did_save) {
2165 Label L_done;
2166 ba(L_done);
2167 delayed()->restore();
2168
2169 bind(L_no_such_interface_restore);
2170 ba(L_no_such_interface);
2171 delayed()->restore();
2172
2173 bind(L_done);
2174 }
2175 }
2176
2177
2178 // virtual method calling
2179 void MacroAssembler::lookup_virtual_method(Register recv_klass,
2180 RegisterOrConstant vtable_index,
2181 Register method_result) {
2182 assert_different_registers(recv_klass, method_result, vtable_index.register_or_noreg());
2183 Register sethi_temp = method_result;
2184 const int base = in_bytes(Klass::vtable_start_offset()) +
2185 // method pointer offset within the vtable entry:
2186 vtableEntry::method_offset_in_bytes();
2187 RegisterOrConstant vtable_offset = vtable_index;
2188 // Each of the following three lines potentially generates an instruction.
2189 // But the total number of address formation instructions will always be
2190 // at most two, and will often be zero. In any case, it will be optimal.
2191 // If vtable_index is a register, we will have (sll_ptr N,x; inc_ptr B,x; ld_ptr k,x).
2192 // If vtable_index is a constant, we will have at most (set B+X<<N,t; ld_ptr k,t).
2193 vtable_offset = regcon_sll_ptr(vtable_index, exact_log2(vtableEntry::size_in_bytes()), vtable_offset);
2194 vtable_offset = regcon_inc_ptr(vtable_offset, base, vtable_offset, sethi_temp);
2195 Address vtable_entry_addr(recv_klass, ensure_simm13_or_reg(vtable_offset, sethi_temp));
2196 ld_ptr(vtable_entry_addr, method_result);
2197 }
2198
2199
2200 void MacroAssembler::check_klass_subtype(Register sub_klass,
2201 Register super_klass,
2202 Register temp_reg,
2203 Register temp2_reg,
2204 Label& L_success) {
2205 Register sub_2 = sub_klass;
2206 Register sup_2 = super_klass;
2207 if (!sub_2->is_global()) sub_2 = L0;
2208 if (!sup_2->is_global()) sup_2 = L1;
2209 bool did_save = false;
2210 if (temp_reg == noreg || temp2_reg == noreg) {
2211 temp_reg = L2;
2212 temp2_reg = L3;
2213 save_frame_and_mov(0, sub_klass, sub_2, super_klass, sup_2);
2214 sub_klass = sub_2;
2215 super_klass = sup_2;
2216 did_save = true;
2217 }
2218 Label L_failure, L_pop_to_failure, L_pop_to_success;
2219 check_klass_subtype_fast_path(sub_klass, super_klass,
2220 temp_reg, temp2_reg,
2221 (did_save ? &L_pop_to_success : &L_success),
2222 (did_save ? &L_pop_to_failure : &L_failure), NULL);
2223
2224 if (!did_save)
2225 save_frame_and_mov(0, sub_klass, sub_2, super_klass, sup_2);
2226 check_klass_subtype_slow_path(sub_2, sup_2,
2227 L2, L3, L4, L5,
2228 NULL, &L_pop_to_failure);
2229
2230 // on success:
2231 bind(L_pop_to_success);
2232 restore();
2233 ba_short(L_success);
2234
2235 // on failure:
2236 bind(L_pop_to_failure);
2237 restore();
2238 bind(L_failure);
2239 }
2240
2241
2242 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass,
2243 Register super_klass,
2244 Register temp_reg,
2245 Register temp2_reg,
2246 Label* L_success,
2247 Label* L_failure,
2248 Label* L_slow_path,
2249 RegisterOrConstant super_check_offset) {
2250 int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
2251 int sco_offset = in_bytes(Klass::super_check_offset_offset());
2252
2253 bool must_load_sco = (super_check_offset.constant_or_zero() == -1);
2254 bool need_slow_path = (must_load_sco ||
2255 super_check_offset.constant_or_zero() == sco_offset);
2256
2257 assert_different_registers(sub_klass, super_klass, temp_reg);
2258 if (super_check_offset.is_register()) {
2259 assert_different_registers(sub_klass, super_klass, temp_reg,
2260 super_check_offset.as_register());
2261 } else if (must_load_sco) {
2262 assert(temp2_reg != noreg, "supply either a temp or a register offset");
2263 }
2264
2265 Label L_fallthrough;
2266 int label_nulls = 0;
2267 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
2268 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
2269 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; }
2270 assert(label_nulls <= 1 ||
2271 (L_slow_path == &L_fallthrough && label_nulls <= 2 && !need_slow_path),
2272 "at most one NULL in the batch, usually");
2273
2274 // If the pointers are equal, we are done (e.g., String[] elements).
2275 // This self-check enables sharing of secondary supertype arrays among
2276 // non-primary types such as array-of-interface. Otherwise, each such
2277 // type would need its own customized SSA.
2278 // We move this check to the front of the fast path because many
2279 // type checks are in fact trivially successful in this manner,
2280 // so we get a nicely predicted branch right at the start of the check.
2281 cmp(super_klass, sub_klass);
2282 brx(Assembler::equal, false, Assembler::pn, *L_success);
2283 delayed()->nop();
2284
2285 // Check the supertype display:
2286 if (must_load_sco) {
2287 // The super check offset is always positive...
2288 lduw(super_klass, sco_offset, temp2_reg);
2289 super_check_offset = RegisterOrConstant(temp2_reg);
2290 // super_check_offset is register.
2291 assert_different_registers(sub_klass, super_klass, temp_reg, super_check_offset.as_register());
2292 }
2293 ld_ptr(sub_klass, super_check_offset, temp_reg);
2294 cmp(super_klass, temp_reg);
2295
2296 // This check has worked decisively for primary supers.
2297 // Secondary supers are sought in the super_cache ('super_cache_addr').
2298 // (Secondary supers are interfaces and very deeply nested subtypes.)
2299 // This works in the same check above because of a tricky aliasing
2300 // between the super_cache and the primary super display elements.
2301 // (The 'super_check_addr' can address either, as the case requires.)
2302 // Note that the cache is updated below if it does not help us find
2303 // what we need immediately.
2304 // So if it was a primary super, we can just fail immediately.
2305 // Otherwise, it's the slow path for us (no success at this point).
2306
2307 // Hacked ba(), which may only be used just before L_fallthrough.
2308 #define FINAL_JUMP(label) \
2309 if (&(label) != &L_fallthrough) { \
2310 ba(label); delayed()->nop(); \
2311 }
2312
2313 if (super_check_offset.is_register()) {
2314 brx(Assembler::equal, false, Assembler::pn, *L_success);
2315 delayed()->cmp(super_check_offset.as_register(), sc_offset);
2316
2317 if (L_failure == &L_fallthrough) {
2318 brx(Assembler::equal, false, Assembler::pt, *L_slow_path);
2319 delayed()->nop();
2320 } else {
2321 brx(Assembler::notEqual, false, Assembler::pn, *L_failure);
2322 delayed()->nop();
2323 FINAL_JUMP(*L_slow_path);
2324 }
2325 } else if (super_check_offset.as_constant() == sc_offset) {
2326 // Need a slow path; fast failure is impossible.
2327 if (L_slow_path == &L_fallthrough) {
2328 brx(Assembler::equal, false, Assembler::pt, *L_success);
2329 delayed()->nop();
2330 } else {
2331 brx(Assembler::notEqual, false, Assembler::pn, *L_slow_path);
2332 delayed()->nop();
2333 FINAL_JUMP(*L_success);
2334 }
2335 } else {
2336 // No slow path; it's a fast decision.
2337 if (L_failure == &L_fallthrough) {
2338 brx(Assembler::equal, false, Assembler::pt, *L_success);
2339 delayed()->nop();
2340 } else {
2341 brx(Assembler::notEqual, false, Assembler::pn, *L_failure);
2342 delayed()->nop();
2343 FINAL_JUMP(*L_success);
2344 }
2345 }
2346
2347 bind(L_fallthrough);
2348
2349 #undef FINAL_JUMP
2350 }
2351
2352
2353 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass,
2354 Register super_klass,
2355 Register count_temp,
2356 Register scan_temp,
2357 Register scratch_reg,
2358 Register coop_reg,
2359 Label* L_success,
2360 Label* L_failure) {
2361 assert_different_registers(sub_klass, super_klass,
2362 count_temp, scan_temp, scratch_reg, coop_reg);
2363
2364 Label L_fallthrough, L_loop;
2365 int label_nulls = 0;
2366 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
2367 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
2368 assert(label_nulls <= 1, "at most one NULL in the batch");
2369
2370 // a couple of useful fields in sub_klass:
2371 int ss_offset = in_bytes(Klass::secondary_supers_offset());
2372 int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
2373
2374 // Do a linear scan of the secondary super-klass chain.
2375 // This code is rarely used, so simplicity is a virtue here.
2376
2377 #ifndef PRODUCT
2378 int* pst_counter = &SharedRuntime::_partial_subtype_ctr;
2379 inc_counter((address) pst_counter, count_temp, scan_temp);
2380 #endif
2381
2382 // We will consult the secondary-super array.
2383 ld_ptr(sub_klass, ss_offset, scan_temp);
2384
2385 Register search_key = super_klass;
2386
2387 // Load the array length. (Positive movl does right thing on LP64.)
2388 lduw(scan_temp, Array<Klass*>::length_offset_in_bytes(), count_temp);
2389
2390 // Check for empty secondary super list
2391 tst(count_temp);
2392
2393 // In the array of super classes elements are pointer sized.
2394 int element_size = wordSize;
2395
2396 // Top of search loop
2397 bind(L_loop);
2398 br(Assembler::equal, false, Assembler::pn, *L_failure);
2399 delayed()->add(scan_temp, element_size, scan_temp);
2400
2401 // Skip the array header in all array accesses.
2402 int elem_offset = Array<Klass*>::base_offset_in_bytes();
2403 elem_offset -= element_size; // the scan pointer was pre-incremented also
2404
2405 // Load next super to check
2406 ld_ptr( scan_temp, elem_offset, scratch_reg );
2407
2408 // Look for Rsuper_klass on Rsub_klass's secondary super-class-overflow list
2409 cmp(scratch_reg, search_key);
2410
2411 // A miss means we are NOT a subtype and need to keep looping
2412 brx(Assembler::notEqual, false, Assembler::pn, L_loop);
2413 delayed()->deccc(count_temp); // decrement trip counter in delay slot
2414
2415 // Success. Cache the super we found and proceed in triumph.
2416 st_ptr(super_klass, sub_klass, sc_offset);
2417
2418 if (L_success != &L_fallthrough) {
2419 ba(*L_success);
2420 delayed()->nop();
2421 }
2422
2423 bind(L_fallthrough);
2424 }
2425
2426
2427 RegisterOrConstant MacroAssembler::argument_offset(RegisterOrConstant arg_slot,
2428 Register temp_reg,
2429 int extra_slot_offset) {
2430 // cf. TemplateTable::prepare_invoke(), if (load_receiver).
2431 int stackElementSize = Interpreter::stackElementSize;
2432 int offset = extra_slot_offset * stackElementSize;
2433 if (arg_slot.is_constant()) {
2434 offset += arg_slot.as_constant() * stackElementSize;
2435 return offset;
2436 } else {
2437 assert(temp_reg != noreg, "must specify");
2438 sll_ptr(arg_slot.as_register(), exact_log2(stackElementSize), temp_reg);
2439 if (offset != 0)
2440 add(temp_reg, offset, temp_reg);
2441 return temp_reg;
2442 }
2443 }
2444
2445
2446 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
2447 Register temp_reg,
2448 int extra_slot_offset) {
2449 return Address(Gargs, argument_offset(arg_slot, temp_reg, extra_slot_offset));
2450 }
2451
2452
2453 void MacroAssembler::biased_locking_enter(Register obj_reg, Register mark_reg,
2454 Register temp_reg,
2455 Label& done, Label* slow_case,
2456 BiasedLockingCounters* counters) {
2457 assert(UseBiasedLocking, "why call this otherwise?");
2458
2459 if (PrintBiasedLockingStatistics) {
2460 assert_different_registers(obj_reg, mark_reg, temp_reg, O7);
2461 if (counters == NULL)
2462 counters = BiasedLocking::counters();
2463 }
2464
2465 Label cas_label;
2466
2467 // Biased locking
2468 // See whether the lock is currently biased toward our thread and
2469 // whether the epoch is still valid
2470 // Note that the runtime guarantees sufficient alignment of JavaThread
2471 // pointers to allow age to be placed into low bits
2472 assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout");
2473 and3(mark_reg, markOopDesc::biased_lock_mask_in_place, temp_reg);
2474 cmp_and_brx_short(temp_reg, markOopDesc::biased_lock_pattern, Assembler::notEqual, Assembler::pn, cas_label);
2475
2476 load_klass(obj_reg, temp_reg);
2477 ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
2478 or3(G2_thread, temp_reg, temp_reg);
2479 xor3(mark_reg, temp_reg, temp_reg);
2480 andcc(temp_reg, ~((int) markOopDesc::age_mask_in_place), temp_reg);
2481 if (counters != NULL) {
2482 cond_inc(Assembler::equal, (address) counters->biased_lock_entry_count_addr(), mark_reg, temp_reg);
2483 // Reload mark_reg as we may need it later
2484 ld_ptr(Address(obj_reg, oopDesc::mark_offset_in_bytes()), mark_reg);
2485 }
2486 brx(Assembler::equal, true, Assembler::pt, done);
2487 delayed()->nop();
2488
2489 Label try_revoke_bias;
2490 Label try_rebias;
2491 Address mark_addr = Address(obj_reg, oopDesc::mark_offset_in_bytes());
2492 assert(mark_addr.disp() == 0, "cas must take a zero displacement");
2493
2494 // At this point we know that the header has the bias pattern and
2495 // that we are not the bias owner in the current epoch. We need to
2496 // figure out more details about the state of the header in order to
2497 // know what operations can be legally performed on the object's
2498 // header.
2499
2500 // If the low three bits in the xor result aren't clear, that means
2501 // the prototype header is no longer biased and we have to revoke
2502 // the bias on this object.
2503 btst(markOopDesc::biased_lock_mask_in_place, temp_reg);
2504 brx(Assembler::notZero, false, Assembler::pn, try_revoke_bias);
2505
2506 // Biasing is still enabled for this data type. See whether the
2507 // epoch of the current bias is still valid, meaning that the epoch
2508 // bits of the mark word are equal to the epoch bits of the
2509 // prototype header. (Note that the prototype header's epoch bits
2510 // only change at a safepoint.) If not, attempt to rebias the object
2511 // toward the current thread. Note that we must be absolutely sure
2512 // that the current epoch is invalid in order to do this because
2513 // otherwise the manipulations it performs on the mark word are
2514 // illegal.
2515 delayed()->btst(markOopDesc::epoch_mask_in_place, temp_reg);
2516 brx(Assembler::notZero, false, Assembler::pn, try_rebias);
2517
2518 // The epoch of the current bias is still valid but we know nothing
2519 // about the owner; it might be set or it might be clear. Try to
2520 // acquire the bias of the object using an atomic operation. If this
2521 // fails we will go in to the runtime to revoke the object's bias.
2522 // Note that we first construct the presumed unbiased header so we
2523 // don't accidentally blow away another thread's valid bias.
2524 delayed()->and3(mark_reg,
2525 markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place,
2526 mark_reg);
2527 or3(G2_thread, mark_reg, temp_reg);
2528 cas_ptr(mark_addr.base(), mark_reg, temp_reg);
2529 // If the biasing toward our thread failed, this means that
2530 // another thread succeeded in biasing it toward itself and we
2531 // need to revoke that bias. The revocation will occur in the
2532 // interpreter runtime in the slow case.
2533 cmp(mark_reg, temp_reg);
2534 if (counters != NULL) {
2535 cond_inc(Assembler::zero, (address) counters->anonymously_biased_lock_entry_count_addr(), mark_reg, temp_reg);
2536 }
2537 if (slow_case != NULL) {
2538 brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
2539 delayed()->nop();
2540 }
2541 ba_short(done);
2542
2543 bind(try_rebias);
2544 // At this point we know the epoch has expired, meaning that the
2545 // current "bias owner", if any, is actually invalid. Under these
2546 // circumstances _only_, we are allowed to use the current header's
2547 // value as the comparison value when doing the cas to acquire the
2548 // bias in the current epoch. In other words, we allow transfer of
2549 // the bias from one thread to another directly in this situation.
2550 //
2551 // FIXME: due to a lack of registers we currently blow away the age
2552 // bits in this situation. Should attempt to preserve them.
2553 load_klass(obj_reg, temp_reg);
2554 ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
2555 or3(G2_thread, temp_reg, temp_reg);
2556 cas_ptr(mark_addr.base(), mark_reg, temp_reg);
2557 // If the biasing toward our thread failed, this means that
2558 // another thread succeeded in biasing it toward itself and we
2559 // need to revoke that bias. The revocation will occur in the
2560 // interpreter runtime in the slow case.
2561 cmp(mark_reg, temp_reg);
2562 if (counters != NULL) {
2563 cond_inc(Assembler::zero, (address) counters->rebiased_lock_entry_count_addr(), mark_reg, temp_reg);
2564 }
2565 if (slow_case != NULL) {
2566 brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
2567 delayed()->nop();
2568 }
2569 ba_short(done);
2570
2571 bind(try_revoke_bias);
2572 // The prototype mark in the klass doesn't have the bias bit set any
2573 // more, indicating that objects of this data type are not supposed
2574 // to be biased any more. We are going to try to reset the mark of
2575 // this object to the prototype value and fall through to the
2576 // CAS-based locking scheme. Note that if our CAS fails, it means
2577 // that another thread raced us for the privilege of revoking the
2578 // bias of this particular object, so it's okay to continue in the
2579 // normal locking code.
2580 //
2581 // FIXME: due to a lack of registers we currently blow away the age
2582 // bits in this situation. Should attempt to preserve them.
2583 load_klass(obj_reg, temp_reg);
2584 ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
2585 cas_ptr(mark_addr.base(), mark_reg, temp_reg);
2586 // Fall through to the normal CAS-based lock, because no matter what
2587 // the result of the above CAS, some thread must have succeeded in
2588 // removing the bias bit from the object's header.
2589 if (counters != NULL) {
2590 cmp(mark_reg, temp_reg);
2591 cond_inc(Assembler::zero, (address) counters->revoked_lock_entry_count_addr(), mark_reg, temp_reg);
2592 }
2593
2594 bind(cas_label);
2595 }
2596
2597 void MacroAssembler::biased_locking_exit (Address mark_addr, Register temp_reg, Label& done,
2598 bool allow_delay_slot_filling) {
2599 // Check for biased locking unlock case, which is a no-op
2600 // Note: we do not have to check the thread ID for two reasons.
2601 // First, the interpreter checks for IllegalMonitorStateException at
2602 // a higher level. Second, if the bias was revoked while we held the
2603 // lock, the object could not be rebiased toward another thread, so
2604 // the bias bit would be clear.
2605 ld_ptr(mark_addr, temp_reg);
2606 and3(temp_reg, markOopDesc::biased_lock_mask_in_place, temp_reg);
2607 cmp(temp_reg, markOopDesc::biased_lock_pattern);
2608 brx(Assembler::equal, allow_delay_slot_filling, Assembler::pt, done);
2609 delayed();
2610 if (!allow_delay_slot_filling) {
2611 nop();
2612 }
2613 }
2614
2615
2616 // compiler_lock_object() and compiler_unlock_object() are direct transliterations
2617 // of i486.ad fast_lock() and fast_unlock(). See those methods for detailed comments.
2618 // The code could be tightened up considerably.
2619 //
2620 // box->dhw disposition - post-conditions at DONE_LABEL.
2621 // - Successful inflated lock: box->dhw != 0.
2622 // Any non-zero value suffices.
2623 // Consider G2_thread, rsp, boxReg, or markOopDesc::unused_mark()
2624 // - Successful Stack-lock: box->dhw == mark.
2625 // box->dhw must contain the displaced mark word value
2626 // - Failure -- icc.ZFlag == 0 and box->dhw is undefined.
2627 // The slow-path fast_enter() and slow_enter() operators
2628 // are responsible for setting box->dhw = NonZero (typically markOopDesc::unused_mark()).
2629 // - Biased: box->dhw is undefined
2630 //
2631 // SPARC refworkload performance - specifically jetstream and scimark - are
2632 // extremely sensitive to the size of the code emitted by compiler_lock_object
2633 // and compiler_unlock_object. Critically, the key factor is code size, not path
2634 // length. (Simply experiments to pad CLO with unexecuted NOPs demonstrte the
2635 // effect).
2636
2637
2638 void MacroAssembler::compiler_lock_object(Register Roop, Register Rmark,
2639 Register Rbox, Register Rscratch,
2640 BiasedLockingCounters* counters,
2641 bool try_bias) {
2642 Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
2643
2644 verify_oop(Roop);
2645 Label done ;
2646
2647 if (counters != NULL) {
2648 inc_counter((address) counters->total_entry_count_addr(), Rmark, Rscratch);
2649 }
2650
2651 // Aggressively avoid the Store-before-CAS penalty
2652 // Defer the store into box->dhw until after the CAS
2653 Label IsInflated, Recursive ;
2654
2655 // Anticipate CAS -- Avoid RTS->RTO upgrade
2656 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads);
2657
2658 ld_ptr(mark_addr, Rmark); // fetch obj->mark
2659 // Triage: biased, stack-locked, neutral, inflated
2660
2661 if (try_bias) {
2662 biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
2663 // Invariant: if control reaches this point in the emitted stream
2664 // then Rmark has not been modified.
2665 }
2666 andcc(Rmark, 2, G0);
2667 brx(Assembler::notZero, false, Assembler::pn, IsInflated);
2668 delayed()-> // Beware - dangling delay-slot
2669
2670 // Try stack-lock acquisition.
2671 // Transiently install BUSY (0) encoding in the mark word.
2672 // if the CAS of 0 into the mark was successful then we execute:
2673 // ST box->dhw = mark -- save fetched mark in on-stack basiclock box
2674 // ST obj->mark = box -- overwrite transient 0 value
2675 // This presumes TSO, of course.
2676
2677 mov(0, Rscratch);
2678 or3(Rmark, markOopDesc::unlocked_value, Rmark);
2679 assert(mark_addr.disp() == 0, "cas must take a zero displacement");
2680 cas_ptr(mark_addr.base(), Rmark, Rscratch);
2681 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads);
2682 cmp(Rscratch, Rmark);
2683 brx(Assembler::notZero, false, Assembler::pn, Recursive);
2684 delayed()->st_ptr(Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
2685 if (counters != NULL) {
2686 cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
2687 }
2688 ba(done);
2689 delayed()->st_ptr(Rbox, mark_addr);
2690
2691 bind(Recursive);
2692 // Stack-lock attempt failed - check for recursive stack-lock.
2693 // Tests show that we can remove the recursive case with no impact
2694 // on refworkload 0.83. If we need to reduce the size of the code
2695 // emitted by compiler_lock_object() the recursive case is perfect
2696 // candidate.
2697 //
2698 // A more extreme idea is to always inflate on stack-lock recursion.
2699 // This lets us eliminate the recursive checks in compiler_lock_object
2700 // and compiler_unlock_object and the (box->dhw == 0) encoding.
2701 // A brief experiment - requiring changes to synchronizer.cpp, interpreter,
2702 // and showed a performance *increase*. In the same experiment I eliminated
2703 // the fast-path stack-lock code from the interpreter and always passed
2704 // control to the "slow" operators in synchronizer.cpp.
2705
2706 // RScratch contains the fetched obj->mark value from the failed CAS.
2707 sub(Rscratch, STACK_BIAS, Rscratch);
2708 sub(Rscratch, SP, Rscratch);
2709 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
2710 andcc(Rscratch, 0xfffff003, Rscratch);
2711 if (counters != NULL) {
2712 // Accounting needs the Rscratch register
2713 st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
2714 cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
2715 ba_short(done);
2716 } else {
2717 ba(done);
2718 delayed()->st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
2719 }
2720
2721 bind (IsInflated);
2722
2723 // Try to CAS m->owner from null to Self
2724 // Invariant: if we acquire the lock then _recursions should be 0.
2725 add(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), Rmark);
2726 mov(G2_thread, Rscratch);
2727 cas_ptr(Rmark, G0, Rscratch);
2728 andcc(Rscratch, Rscratch, G0); // set ICCs for done: icc.zf iff success
2729 // set icc.zf : 1=success 0=failure
2730 // ST box->displaced_header = NonZero.
2731 // Any non-zero value suffices:
2732 // markOopDesc::unused_mark(), G2_thread, RBox, RScratch, rsp, etc.
2733 st_ptr(Rbox, Rbox, BasicLock::displaced_header_offset_in_bytes());
2734 // Intentional fall-through into done
2735
2736 bind (done);
2737 }
2738
2739 void MacroAssembler::compiler_unlock_object(Register Roop, Register Rmark,
2740 Register Rbox, Register Rscratch,
2741 bool try_bias) {
2742 Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
2743
2744 Label done ;
2745
2746 // Beware ... If the aggregate size of the code emitted by CLO and CUO is
2747 // is too large performance rolls abruptly off a cliff.
2748 // This could be related to inlining policies, code cache management, or
2749 // I$ effects.
2750 Label LStacked ;
2751
2752 if (try_bias) {
2753 // TODO: eliminate redundant LDs of obj->mark
2754 biased_locking_exit(mark_addr, Rscratch, done);
2755 }
2756
2757 ld_ptr(Roop, oopDesc::mark_offset_in_bytes(), Rmark);
2758 ld_ptr(Rbox, BasicLock::displaced_header_offset_in_bytes(), Rscratch);
2759 andcc(Rscratch, Rscratch, G0);
2760 brx(Assembler::zero, false, Assembler::pn, done);
2761 delayed()->nop(); // consider: relocate fetch of mark, above, into this DS
2762 andcc(Rmark, 2, G0);
2763 brx(Assembler::zero, false, Assembler::pt, LStacked);
2764 delayed()->nop();
2765
2766 // It's inflated
2767 // Conceptually we need a #loadstore|#storestore "release" MEMBAR before
2768 // the ST of 0 into _owner which releases the lock. This prevents loads
2769 // and stores within the critical section from reordering (floating)
2770 // past the store that releases the lock. But TSO is a strong memory model
2771 // and that particular flavor of barrier is a noop, so we can safely elide it.
2772 // Note that we use 1-0 locking by default for the inflated case. We
2773 // close the resultant (and rare) race by having contended threads in
2774 // monitorenter periodically poll _owner.
2775
2776 // 1-0 form : avoids CAS and MEMBAR in the common case
2777 // Do not bother to ratify that m->Owner == Self.
2778 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions)), Rbox);
2779 orcc(Rbox, G0, G0);
2780 brx(Assembler::notZero, false, Assembler::pn, done);
2781 delayed()->
2782 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(EntryList)), Rscratch);
2783 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(cxq)), Rbox);
2784 orcc(Rbox, Rscratch, G0);
2785 brx(Assembler::zero, false, Assembler::pt, done);
2786 delayed()->
2787 st_ptr(G0, Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)));
2788
2789 if (os::is_MP()) { membar(StoreLoad); }
2790 // Check that _succ is (or remains) non-zero
2791 ld_ptr(Address(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(succ)), Rscratch);
2792 andcc(Rscratch, Rscratch, G0);
2793 brx(Assembler::notZero, false, Assembler::pt, done);
2794 delayed()->andcc(G0, G0, G0);
2795 add(Rmark, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), Rmark);
2796 mov(G2_thread, Rscratch);
2797 cas_ptr(Rmark, G0, Rscratch);
2798 cmp(Rscratch, G0);
2799 // invert icc.zf and goto done
2800 // A slightly better v8+/v9 idiom would be the following:
2801 // movrnz Rscratch,1,Rscratch
2802 // ba done
2803 // xorcc Rscratch,1,G0
2804 // In v8+ mode the idiom would be valid IFF Rscratch was a G or O register
2805 brx(Assembler::notZero, false, Assembler::pt, done);
2806 delayed()->cmp(G0, G0);
2807 br(Assembler::always, false, Assembler::pt, done);
2808 delayed()->cmp(G0, 1);
2809
2810 bind (LStacked);
2811 // Consider: we could replace the expensive CAS in the exit
2812 // path with a simple ST of the displaced mark value fetched from
2813 // the on-stack basiclock box. That admits a race where a thread T2
2814 // in the slow lock path -- inflating with monitor M -- could race a
2815 // thread T1 in the fast unlock path, resulting in a missed wakeup for T2.
2816 // More precisely T1 in the stack-lock unlock path could "stomp" the
2817 // inflated mark value M installed by T2, resulting in an orphan
2818 // object monitor M and T2 becoming stranded. We can remedy that situation
2819 // by having T2 periodically poll the object's mark word using timed wait
2820 // operations. If T2 discovers that a stomp has occurred it vacates
2821 // the monitor M and wakes any other threads stranded on the now-orphan M.
2822 // In addition the monitor scavenger, which performs deflation,
2823 // would also need to check for orpan monitors and stranded threads.
2824 //
2825 // Finally, inflation is also used when T2 needs to assign a hashCode
2826 // to O and O is stack-locked by T1. The "stomp" race could cause
2827 // an assigned hashCode value to be lost. We can avoid that condition
2828 // and provide the necessary hashCode stability invariants by ensuring
2829 // that hashCode generation is idempotent between copying GCs.
2830 // For example we could compute the hashCode of an object O as
2831 // O's heap address XOR some high quality RNG value that is refreshed
2832 // at GC-time. The monitor scavenger would install the hashCode
2833 // found in any orphan monitors. Again, the mechanism admits a
2834 // lost-update "stomp" WAW race but detects and recovers as needed.
2835 //
2836 // A prototype implementation showed excellent results, although
2837 // the scavenger and timeout code was rather involved.
2838
2839 cas_ptr(mark_addr.base(), Rbox, Rscratch);
2840 cmp(Rbox, Rscratch);
2841 // Intentional fall through into done ...
2842
2843 bind(done);
2844 }
2845
2846
2847
2848 void MacroAssembler::print_CPU_state() {
2849 // %%%%% need to implement this
2850 }
2851
2852 void MacroAssembler::verify_FPU(int stack_depth, const char* s) {
2853 // %%%%% need to implement this
2854 }
2855
2856 void MacroAssembler::push_IU_state() {
2857 // %%%%% need to implement this
2858 }
2859
2860
2861 void MacroAssembler::pop_IU_state() {
2862 // %%%%% need to implement this
2863 }
2864
2865
2866 void MacroAssembler::push_FPU_state() {
2867 // %%%%% need to implement this
2868 }
2869
2870
2871 void MacroAssembler::pop_FPU_state() {
2872 // %%%%% need to implement this
2873 }
2874
2875
2876 void MacroAssembler::push_CPU_state() {
2877 // %%%%% need to implement this
2878 }
2879
2880
2881 void MacroAssembler::pop_CPU_state() {
2882 // %%%%% need to implement this
2883 }
2884
2885
2886
2887 void MacroAssembler::verify_tlab() {
2888 #ifdef ASSERT
2889 if (UseTLAB && VerifyOops) {
2890 Label next, next2, ok;
2891 Register t1 = L0;
2892 Register t2 = L1;
2893 Register t3 = L2;
2894
2895 save_frame(0);
2896 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
2897 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_start_offset()), t2);
2898 or3(t1, t2, t3);
2899 cmp_and_br_short(t1, t2, Assembler::greaterEqual, Assembler::pn, next);
2900 STOP("assert(top >= start)");
2901 should_not_reach_here();
2902
2903 bind(next);
2904 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
2905 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), t2);
2906 or3(t3, t2, t3);
2907 cmp_and_br_short(t1, t2, Assembler::lessEqual, Assembler::pn, next2);
2908 STOP("assert(top <= end)");
2909 should_not_reach_here();
2910
2911 bind(next2);
2912 and3(t3, MinObjAlignmentInBytesMask, t3);
2913 cmp_and_br_short(t3, 0, Assembler::lessEqual, Assembler::pn, ok);
2914 STOP("assert(aligned)");
2915 should_not_reach_here();
2916
2917 bind(ok);
2918 restore();
2919 }
2920 #endif
2921 }
2922
2923
2924 void MacroAssembler::eden_allocate(
2925 Register obj, // result: pointer to object after successful allocation
2926 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise
2927 int con_size_in_bytes, // object size in bytes if known at compile time
2928 Register t1, // temp register
2929 Register t2, // temp register
2930 Label& slow_case // continuation point if fast allocation fails
2931 ){
2932 // make sure arguments make sense
2933 assert_different_registers(obj, var_size_in_bytes, t1, t2);
2934 assert(0 <= con_size_in_bytes && Assembler::is_simm13(con_size_in_bytes), "illegal object size");
2935 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
2936
2937 if (!Universe::heap()->supports_inline_contig_alloc()) {
2938 // No allocation in the shared eden.
2939 ba(slow_case);
2940 delayed()->nop();
2941 } else {
2942 // get eden boundaries
2943 // note: we need both top & top_addr!
2944 const Register top_addr = t1;
2945 const Register end = t2;
2946
2947 CollectedHeap* ch = Universe::heap();
2948 set((intx)ch->top_addr(), top_addr);
2949 intx delta = (intx)ch->end_addr() - (intx)ch->top_addr();
2950 ld_ptr(top_addr, delta, end);
2951 ld_ptr(top_addr, 0, obj);
2952
2953 // try to allocate
2954 Label retry;
2955 bind(retry);
2956 #ifdef ASSERT
2957 // make sure eden top is properly aligned
2958 {
2959 Label L;
2960 btst(MinObjAlignmentInBytesMask, obj);
2961 br(Assembler::zero, false, Assembler::pt, L);
2962 delayed()->nop();
2963 STOP("eden top is not properly aligned");
2964 bind(L);
2965 }
2966 #endif // ASSERT
2967 const Register free = end;
2968 sub(end, obj, free); // compute amount of free space
2969 if (var_size_in_bytes->is_valid()) {
2970 // size is unknown at compile time
2971 cmp(free, var_size_in_bytes);
2972 brx(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
2973 delayed()->add(obj, var_size_in_bytes, end);
2974 } else {
2975 // size is known at compile time
2976 cmp(free, con_size_in_bytes);
2977 brx(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
2978 delayed()->add(obj, con_size_in_bytes, end);
2979 }
2980 // Compare obj with the value at top_addr; if still equal, swap the value of
2981 // end with the value at top_addr. If not equal, read the value at top_addr
2982 // into end.
2983 cas_ptr(top_addr, obj, end);
2984 // if someone beat us on the allocation, try again, otherwise continue
2985 cmp(obj, end);
2986 brx(Assembler::notEqual, false, Assembler::pn, retry);
2987 delayed()->mov(end, obj); // nop if successfull since obj == end
2988
2989 #ifdef ASSERT
2990 // make sure eden top is properly aligned
2991 {
2992 Label L;
2993 const Register top_addr = t1;
2994
2995 set((intx)ch->top_addr(), top_addr);
2996 ld_ptr(top_addr, 0, top_addr);
2997 btst(MinObjAlignmentInBytesMask, top_addr);
2998 br(Assembler::zero, false, Assembler::pt, L);
2999 delayed()->nop();
3000 STOP("eden top is not properly aligned");
3001 bind(L);
3002 }
3003 #endif // ASSERT
3004 }
3005 }
3006
3007
3008 void MacroAssembler::tlab_allocate(
3009 Register obj, // result: pointer to object after successful allocation
3010 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise
3011 int con_size_in_bytes, // object size in bytes if known at compile time
3012 Register t1, // temp register
3013 Label& slow_case // continuation point if fast allocation fails
3014 ){
3015 // make sure arguments make sense
3016 assert_different_registers(obj, var_size_in_bytes, t1);
3017 assert(0 <= con_size_in_bytes && is_simm13(con_size_in_bytes), "illegal object size");
3018 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
3019
3020 const Register free = t1;
3021
3022 verify_tlab();
3023
3024 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), obj);
3025
3026 // calculate amount of free space
3027 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), free);
3028 sub(free, obj, free);
3029
3030 Label done;
3031 if (var_size_in_bytes == noreg) {
3032 cmp(free, con_size_in_bytes);
3033 } else {
3034 cmp(free, var_size_in_bytes);
3035 }
3036 br(Assembler::less, false, Assembler::pn, slow_case);
3037 // calculate the new top pointer
3038 if (var_size_in_bytes == noreg) {
3039 delayed()->add(obj, con_size_in_bytes, free);
3040 } else {
3041 delayed()->add(obj, var_size_in_bytes, free);
3042 }
3043
3044 bind(done);
3045
3046 #ifdef ASSERT
3047 // make sure new free pointer is properly aligned
3048 {
3049 Label L;
3050 btst(MinObjAlignmentInBytesMask, free);
3051 br(Assembler::zero, false, Assembler::pt, L);
3052 delayed()->nop();
3053 STOP("updated TLAB free is not properly aligned");
3054 bind(L);
3055 }
3056 #endif // ASSERT
3057
3058 // update the tlab top pointer
3059 st_ptr(free, G2_thread, in_bytes(JavaThread::tlab_top_offset()));
3060 verify_tlab();
3061 }
3062
3063 void MacroAssembler::zero_memory(Register base, Register index) {
3064 assert_different_registers(base, index);
3065 Label loop;
3066 bind(loop);
3067 subcc(index, HeapWordSize, index);
3068 brx(Assembler::greaterEqual, true, Assembler::pt, loop);
3069 delayed()->st_ptr(G0, base, index);
3070 }
3071
3072 void MacroAssembler::incr_allocated_bytes(RegisterOrConstant size_in_bytes,
3073 Register t1, Register t2) {
3074 // Bump total bytes allocated by this thread
3075 assert(t1->is_global(), "must be global reg"); // so all 64 bits are saved on a context switch
3076 assert_different_registers(size_in_bytes.register_or_noreg(), t1, t2);
3077 // v8 support has gone the way of the dodo
3078 ldx(G2_thread, in_bytes(JavaThread::allocated_bytes_offset()), t1);
3079 add(t1, ensure_simm13_or_reg(size_in_bytes, t2), t1);
3080 stx(t1, G2_thread, in_bytes(JavaThread::allocated_bytes_offset()));
3081 }
3082
3083 Assembler::Condition MacroAssembler::negate_condition(Assembler::Condition cond) {
3084 switch (cond) {
3085 // Note some conditions are synonyms for others
3086 case Assembler::never: return Assembler::always;
3087 case Assembler::zero: return Assembler::notZero;
3088 case Assembler::lessEqual: return Assembler::greater;
3089 case Assembler::less: return Assembler::greaterEqual;
3090 case Assembler::lessEqualUnsigned: return Assembler::greaterUnsigned;
3091 case Assembler::lessUnsigned: return Assembler::greaterEqualUnsigned;
3092 case Assembler::negative: return Assembler::positive;
3093 case Assembler::overflowSet: return Assembler::overflowClear;
3094 case Assembler::always: return Assembler::never;
3095 case Assembler::notZero: return Assembler::zero;
3096 case Assembler::greater: return Assembler::lessEqual;
3097 case Assembler::greaterEqual: return Assembler::less;
3098 case Assembler::greaterUnsigned: return Assembler::lessEqualUnsigned;
3099 case Assembler::greaterEqualUnsigned: return Assembler::lessUnsigned;
3100 case Assembler::positive: return Assembler::negative;
3101 case Assembler::overflowClear: return Assembler::overflowSet;
3102 }
3103
3104 ShouldNotReachHere(); return Assembler::overflowClear;
3105 }
3106
3107 void MacroAssembler::cond_inc(Assembler::Condition cond, address counter_ptr,
3108 Register Rtmp1, Register Rtmp2 /*, Register Rtmp3, Register Rtmp4 */) {
3109 Condition negated_cond = negate_condition(cond);
3110 Label L;
3111 brx(negated_cond, false, Assembler::pt, L);
3112 delayed()->nop();
3113 inc_counter(counter_ptr, Rtmp1, Rtmp2);
3114 bind(L);
3115 }
3116
3117 void MacroAssembler::inc_counter(address counter_addr, Register Rtmp1, Register Rtmp2) {
3118 AddressLiteral addrlit(counter_addr);
3119 sethi(addrlit, Rtmp1); // Move hi22 bits into temporary register.
3120 Address addr(Rtmp1, addrlit.low10()); // Build an address with low10 bits.
3121 ld(addr, Rtmp2);
3122 inc(Rtmp2);
3123 st(Rtmp2, addr);
3124 }
3125
3126 void MacroAssembler::inc_counter(int* counter_addr, Register Rtmp1, Register Rtmp2) {
3127 inc_counter((address) counter_addr, Rtmp1, Rtmp2);
3128 }
3129
3130 SkipIfEqual::SkipIfEqual(
3131 MacroAssembler* masm, Register temp, const bool* flag_addr,
3132 Assembler::Condition condition) {
3133 _masm = masm;
3134 AddressLiteral flag(flag_addr);
3135 _masm->sethi(flag, temp);
3136 _masm->ldub(temp, flag.low10(), temp);
3137 _masm->tst(temp);
3138 _masm->br(condition, false, Assembler::pt, _label);
3139 _masm->delayed()->nop();
3140 }
3141
3142 SkipIfEqual::~SkipIfEqual() {
3143 _masm->bind(_label);
3144 }
3145
3146 void MacroAssembler::bang_stack_with_offset(int offset) {
3147 // stack grows down, caller passes positive offset
3148 assert(offset > 0, "must bang with negative offset");
3149 set((-offset)+STACK_BIAS, G3_scratch);
3150 st(G0, SP, G3_scratch);
3151 }
3152
3153 // Writes to stack successive pages until offset reached to check for
3154 // stack overflow + shadow pages. This clobbers tsp and scratch.
3155 void MacroAssembler::bang_stack_size(Register Rsize, Register Rtsp,
3156 Register Rscratch) {
3157 // Use stack pointer in temp stack pointer
3158 mov(SP, Rtsp);
3159
3160 // Bang stack for total size given plus stack shadow page size.
3161 // Bang one page at a time because a large size can overflow yellow and
3162 // red zones (the bang will fail but stack overflow handling can't tell that
3163 // it was a stack overflow bang vs a regular segv).
3164 int offset = os::vm_page_size();
3165 Register Roffset = Rscratch;
3166
3167 Label loop;
3168 bind(loop);
3169 set((-offset)+STACK_BIAS, Rscratch);
3170 st(G0, Rtsp, Rscratch);
3171 set(offset, Roffset);
3172 sub(Rsize, Roffset, Rsize);
3173 cmp(Rsize, G0);
3174 br(Assembler::greater, false, Assembler::pn, loop);
3175 delayed()->sub(Rtsp, Roffset, Rtsp);
3176
3177 // Bang down shadow pages too.
3178 // At this point, (tmp-0) is the last address touched, so don't
3179 // touch it again. (It was touched as (tmp-pagesize) but then tmp
3180 // was post-decremented.) Skip this address by starting at i=1, and
3181 // touch a few more pages below. N.B. It is important to touch all
3182 // the way down to and including i=StackShadowPages.
3183 for (int i = 1; i < JavaThread::stack_shadow_zone_size() / os::vm_page_size(); i++) {
3184 set((-i*offset)+STACK_BIAS, Rscratch);
3185 st(G0, Rtsp, Rscratch);
3186 }
3187 }
3188
3189 void MacroAssembler::reserved_stack_check() {
3190 // testing if reserved zone needs to be enabled
3191 Label no_reserved_zone_enabling;
3192
3193 ld_ptr(G2_thread, JavaThread::reserved_stack_activation_offset(), G4_scratch);
3194 cmp_and_brx_short(SP, G4_scratch, Assembler::lessUnsigned, Assembler::pt, no_reserved_zone_enabling);
3195
3196 call_VM_leaf(L0, CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), G2_thread);
3197
3198 AddressLiteral stub(StubRoutines::throw_delayed_StackOverflowError_entry());
3199 jump_to(stub, G4_scratch);
3200 delayed()->restore();
3201
3202 should_not_reach_here();
3203
3204 bind(no_reserved_zone_enabling);
3205 }
3206 // ((OopHandle)result).resolve();
3207 void MacroAssembler::resolve_oop_handle(Register result, Register tmp) {
3208 // OopHandle::resolve is an indirection.
3209 access_load_at(T_OBJECT, IN_NATIVE, Address(result, 0), result, tmp);
3210 }
3211
3212 void MacroAssembler::load_mirror(Register mirror, Register method, Register tmp) {
3213 const int mirror_offset = in_bytes(Klass::java_mirror_offset());
3214 ld_ptr(method, in_bytes(Method::const_offset()), mirror);
3215 ld_ptr(mirror, in_bytes(ConstMethod::constants_offset()), mirror);
3216 ld_ptr(mirror, ConstantPool::pool_holder_offset_in_bytes(), mirror);
3217 ld_ptr(mirror, mirror_offset, mirror);
3218 resolve_oop_handle(mirror, tmp);
3219 }
3220
3221 void MacroAssembler::load_klass(Register src_oop, Register klass) {
3222 // The number of bytes in this code is used by
3223 // MachCallDynamicJavaNode::ret_addr_offset()
3224 // if this changes, change that.
3225 if (UseCompressedClassPointers) {
3226 lduw(src_oop, oopDesc::klass_offset_in_bytes(), klass);
3227 decode_klass_not_null(klass);
3228 } else {
3229 ld_ptr(src_oop, oopDesc::klass_offset_in_bytes(), klass);
3230 }
3231 }
3232
3233 void MacroAssembler::store_klass(Register klass, Register dst_oop) {
3234 if (UseCompressedClassPointers) {
3235 assert(dst_oop != klass, "not enough registers");
3236 encode_klass_not_null(klass);
3237 st(klass, dst_oop, oopDesc::klass_offset_in_bytes());
3238 } else {
3239 st_ptr(klass, dst_oop, oopDesc::klass_offset_in_bytes());
3240 }
3241 }
3242
3243 void MacroAssembler::store_klass_gap(Register s, Register d) {
3244 if (UseCompressedClassPointers) {
3245 assert(s != d, "not enough registers");
3246 st(s, d, oopDesc::klass_gap_offset_in_bytes());
3247 }
3248 }
3249
3250 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators,
3251 Register src, Address dst, Register tmp) {
3252 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3253 decorators = AccessInternal::decorator_fixup(decorators);
3254 bool as_raw = (decorators & AS_RAW) != 0;
3255 if (as_raw) {
3256 bs->BarrierSetAssembler::store_at(this, decorators, type, src, dst, tmp);
3257 } else {
3258 bs->store_at(this, decorators, type, src, dst, tmp);
3259 }
3260 }
3261
3262 void MacroAssembler::access_load_at(BasicType type, DecoratorSet decorators,
3263 Address src, Register dst, Register tmp) {
3264 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3265 decorators = AccessInternal::decorator_fixup(decorators);
3266 bool as_raw = (decorators & AS_RAW) != 0;
3267 if (as_raw) {
3268 bs->BarrierSetAssembler::load_at(this, decorators, type, src, dst, tmp);
3269 } else {
3270 bs->load_at(this, decorators, type, src, dst, tmp);
3271 }
3272 }
3273
3274 void MacroAssembler::load_heap_oop(const Address& s, Register d, Register tmp, DecoratorSet decorators) {
3275 access_load_at(T_OBJECT, IN_HEAP | decorators, s, d, tmp);
3276 }
3277
3278 void MacroAssembler::load_heap_oop(Register s1, Register s2, Register d, Register tmp, DecoratorSet decorators) {
3279 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, s2), d, tmp);
3280 }
3281
3282 void MacroAssembler::load_heap_oop(Register s1, int simm13a, Register d, Register tmp, DecoratorSet decorators) {
3283 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, simm13a), d, tmp);
3284 }
3285
3286 void MacroAssembler::load_heap_oop(Register s1, RegisterOrConstant s2, Register d, Register tmp, DecoratorSet decorators) {
3287 if (s2.is_constant()) {
3288 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, s2.as_constant()), d, tmp);
3289 } else {
3290 access_load_at(T_OBJECT, IN_HEAP | decorators, Address(s1, s2.as_register()), d, tmp);
3291 }
3292 }
3293
3294 void MacroAssembler::store_heap_oop(Register d, Register s1, Register s2, Register tmp, DecoratorSet decorators) {
3295 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(s1, s2), tmp);
3296 }
3297
3298 void MacroAssembler::store_heap_oop(Register d, Register s1, int simm13a, Register tmp, DecoratorSet decorators) {
3299 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(s1, simm13a), tmp);
3300 }
3301
3302 void MacroAssembler::store_heap_oop(Register d, const Address& a, int offset, Register tmp, DecoratorSet decorators) {
3303 if (a.has_index()) {
3304 assert(!a.has_disp(), "not supported yet");
3305 assert(offset == 0, "not supported yet");
3306 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(a.base(), a.index()), tmp);
3307 } else {
3308 access_store_at(T_OBJECT, IN_HEAP | decorators, d, Address(a.base(), a.disp() + offset), tmp);
3309 }
3310 }
3311
3312
3313 void MacroAssembler::encode_heap_oop(Register src, Register dst) {
3314 assert (UseCompressedOops, "must be compressed");
3315 assert (Universe::heap() != NULL, "java heap should be initialized");
3316 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
3317 verify_oop(src);
3318 if (Universe::narrow_oop_base() == NULL) {
3319 srlx(src, LogMinObjAlignmentInBytes, dst);
3320 return;
3321 }
3322 Label done;
3323 if (src == dst) {
3324 // optimize for frequent case src == dst
3325 bpr(rc_nz, true, Assembler::pt, src, done);
3326 delayed() -> sub(src, G6_heapbase, dst); // annuled if not taken
3327 bind(done);
3328 srlx(src, LogMinObjAlignmentInBytes, dst);
3329 } else {
3330 bpr(rc_z, false, Assembler::pn, src, done);
3331 delayed() -> mov(G0, dst);
3332 // could be moved before branch, and annulate delay,
3333 // but may add some unneeded work decoding null
3334 sub(src, G6_heapbase, dst);
3335 srlx(dst, LogMinObjAlignmentInBytes, dst);
3336 bind(done);
3337 }
3338 }
3339
3340
3341 void MacroAssembler::encode_heap_oop_not_null(Register r) {
3342 assert (UseCompressedOops, "must be compressed");
3343 assert (Universe::heap() != NULL, "java heap should be initialized");
3344 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
3345 verify_oop(r);
3346 if (Universe::narrow_oop_base() != NULL)
3347 sub(r, G6_heapbase, r);
3348 srlx(r, LogMinObjAlignmentInBytes, r);
3349 }
3350
3351 void MacroAssembler::encode_heap_oop_not_null(Register src, Register dst) {
3352 assert (UseCompressedOops, "must be compressed");
3353 assert (Universe::heap() != NULL, "java heap should be initialized");
3354 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
3355 verify_oop(src);
3356 if (Universe::narrow_oop_base() == NULL) {
3357 srlx(src, LogMinObjAlignmentInBytes, dst);
3358 } else {
3359 sub(src, G6_heapbase, dst);
3360 srlx(dst, LogMinObjAlignmentInBytes, dst);
3361 }
3362 }
3363
3364 // Same algorithm as oops.inline.hpp decode_heap_oop.
3365 void MacroAssembler::decode_heap_oop(Register src, Register dst) {
3366 assert (UseCompressedOops, "must be compressed");
3367 assert (Universe::heap() != NULL, "java heap should be initialized");
3368 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
3369 sllx(src, LogMinObjAlignmentInBytes, dst);
3370 if (Universe::narrow_oop_base() != NULL) {
3371 Label done;
3372 bpr(rc_nz, true, Assembler::pt, dst, done);
3373 delayed() -> add(dst, G6_heapbase, dst); // annuled if not taken
3374 bind(done);
3375 }
3376 verify_oop(dst);
3377 }
3378
3379 void MacroAssembler::decode_heap_oop_not_null(Register r) {
3380 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3381 // pd_code_size_limit.
3382 // Also do not verify_oop as this is called by verify_oop.
3383 assert (UseCompressedOops, "must be compressed");
3384 assert (Universe::heap() != NULL, "java heap should be initialized");
3385 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
3386 sllx(r, LogMinObjAlignmentInBytes, r);
3387 if (Universe::narrow_oop_base() != NULL)
3388 add(r, G6_heapbase, r);
3389 }
3390
3391 void MacroAssembler::decode_heap_oop_not_null(Register src, Register dst) {
3392 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3393 // pd_code_size_limit.
3394 // Also do not verify_oop as this is called by verify_oop.
3395 assert (UseCompressedOops, "must be compressed");
3396 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
3397 sllx(src, LogMinObjAlignmentInBytes, dst);
3398 if (Universe::narrow_oop_base() != NULL)
3399 add(dst, G6_heapbase, dst);
3400 }
3401
3402 void MacroAssembler::encode_klass_not_null(Register r) {
3403 assert (UseCompressedClassPointers, "must be compressed");
3404 if (Universe::narrow_klass_base() != NULL) {
3405 assert(r != G6_heapbase, "bad register choice");
3406 set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
3407 sub(r, G6_heapbase, r);
3408 if (Universe::narrow_klass_shift() != 0) {
3409 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
3410 srlx(r, LogKlassAlignmentInBytes, r);
3411 }
3412 reinit_heapbase();
3413 } else {
3414 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
3415 srlx(r, Universe::narrow_klass_shift(), r);
3416 }
3417 }
3418
3419 void MacroAssembler::encode_klass_not_null(Register src, Register dst) {
3420 if (src == dst) {
3421 encode_klass_not_null(src);
3422 } else {
3423 assert (UseCompressedClassPointers, "must be compressed");
3424 if (Universe::narrow_klass_base() != NULL) {
3425 set((intptr_t)Universe::narrow_klass_base(), dst);
3426 sub(src, dst, dst);
3427 if (Universe::narrow_klass_shift() != 0) {
3428 srlx(dst, LogKlassAlignmentInBytes, dst);
3429 }
3430 } else {
3431 // shift src into dst
3432 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
3433 srlx(src, Universe::narrow_klass_shift(), dst);
3434 }
3435 }
3436 }
3437
3438 // Function instr_size_for_decode_klass_not_null() counts the instructions
3439 // generated by decode_klass_not_null() and reinit_heapbase(). Hence, if
3440 // the instructions they generate change, then this method needs to be updated.
3441 int MacroAssembler::instr_size_for_decode_klass_not_null() {
3442 assert (UseCompressedClassPointers, "only for compressed klass ptrs");
3443 int num_instrs = 1; // shift src,dst or add
3444 if (Universe::narrow_klass_base() != NULL) {
3445 // set + add + set
3446 num_instrs += insts_for_internal_set((intptr_t)Universe::narrow_klass_base()) +
3447 insts_for_internal_set((intptr_t)Universe::narrow_ptrs_base());
3448 if (Universe::narrow_klass_shift() != 0) {
3449 num_instrs += 1; // sllx
3450 }
3451 }
3452 return num_instrs * BytesPerInstWord;
3453 }
3454
3455 // !!! If the instructions that get generated here change then function
3456 // instr_size_for_decode_klass_not_null() needs to get updated.
3457 void MacroAssembler::decode_klass_not_null(Register r) {
3458 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3459 // pd_code_size_limit.
3460 assert (UseCompressedClassPointers, "must be compressed");
3461 if (Universe::narrow_klass_base() != NULL) {
3462 assert(r != G6_heapbase, "bad register choice");
3463 set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
3464 if (Universe::narrow_klass_shift() != 0)
3465 sllx(r, LogKlassAlignmentInBytes, r);
3466 add(r, G6_heapbase, r);
3467 reinit_heapbase();
3468 } else {
3469 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
3470 sllx(r, Universe::narrow_klass_shift(), r);
3471 }
3472 }
3473
3474 void MacroAssembler::decode_klass_not_null(Register src, Register dst) {
3475 if (src == dst) {
3476 decode_klass_not_null(src);
3477 } else {
3478 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
3479 // pd_code_size_limit.
3480 assert (UseCompressedClassPointers, "must be compressed");
3481 if (Universe::narrow_klass_base() != NULL) {
3482 if (Universe::narrow_klass_shift() != 0) {
3483 assert((src != G6_heapbase) && (dst != G6_heapbase), "bad register choice");
3484 set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
3485 sllx(src, LogKlassAlignmentInBytes, dst);
3486 add(dst, G6_heapbase, dst);
3487 reinit_heapbase();
3488 } else {
3489 set((intptr_t)Universe::narrow_klass_base(), dst);
3490 add(src, dst, dst);
3491 }
3492 } else {
3493 // shift/mov src into dst.
3494 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
3495 sllx(src, Universe::narrow_klass_shift(), dst);
3496 }
3497 }
3498 }
3499
3500 void MacroAssembler::reinit_heapbase() {
3501 if (UseCompressedOops || UseCompressedClassPointers) {
3502 if (Universe::heap() != NULL) {
3503 set((intptr_t)Universe::narrow_ptrs_base(), G6_heapbase);
3504 } else {
3505 AddressLiteral base(Universe::narrow_ptrs_base_addr());
3506 load_ptr_contents(base, G6_heapbase);
3507 }
3508 }
3509 }
3510
3511 #ifdef COMPILER2
3512
3513 // Compress char[] to byte[] by compressing 16 bytes at once. Return 0 on failure.
3514 void MacroAssembler::string_compress_16(Register src, Register dst, Register cnt, Register result,
3515 Register tmp1, Register tmp2, Register tmp3, Register tmp4,
3516 FloatRegister ftmp1, FloatRegister ftmp2, FloatRegister ftmp3, Label& Ldone) {
3517 Label Lloop, Lslow;
3518 assert(UseVIS >= 3, "VIS3 is required");
3519 assert_different_registers(src, dst, cnt, tmp1, tmp2, tmp3, tmp4, result);
3520 assert_different_registers(ftmp1, ftmp2, ftmp3);
3521
3522 // Check if cnt >= 8 (= 16 bytes)
3523 cmp(cnt, 8);
3524 br(Assembler::less, false, Assembler::pn, Lslow);
3525 delayed()->mov(cnt, result); // copy count
3526
3527 // Check for 8-byte alignment of src and dst
3528 or3(src, dst, tmp1);
3529 andcc(tmp1, 7, G0);
3530 br(Assembler::notZero, false, Assembler::pn, Lslow);
3531 delayed()->nop();
3532
3533 // Set mask for bshuffle instruction
3534 Register mask = tmp4;
3535 set(0x13579bdf, mask);
3536 bmask(mask, G0, G0);
3537
3538 // Set mask to 0xff00 ff00 ff00 ff00 to check for non-latin1 characters
3539 Assembler::sethi(0xff00fc00, mask); // mask = 0x0000 0000 ff00 fc00
3540 add(mask, 0x300, mask); // mask = 0x0000 0000 ff00 ff00
3541 sllx(mask, 32, tmp1); // tmp1 = 0xff00 ff00 0000 0000
3542 or3(mask, tmp1, mask); // mask = 0xff00 ff00 ff00 ff00
3543
3544 // Load first 8 bytes
3545 ldx(src, 0, tmp1);
3546
3547 bind(Lloop);
3548 // Load next 8 bytes
3549 ldx(src, 8, tmp2);
3550
3551 // Check for non-latin1 character by testing if the most significant byte of a char is set.
3552 // Although we have to move the data between integer and floating point registers, this is
3553 // still faster than the corresponding VIS instructions (ford/fand/fcmpd).
3554 or3(tmp1, tmp2, tmp3);
3555 btst(tmp3, mask);
3556 // annul zeroing if branch is not taken to preserve original count
3557 brx(Assembler::notZero, true, Assembler::pn, Ldone);
3558 delayed()->mov(G0, result); // 0 - failed
3559
3560 // Move bytes into float register
3561 movxtod(tmp1, ftmp1);
3562 movxtod(tmp2, ftmp2);
3563
3564 // Compress by copying one byte per char from ftmp1 and ftmp2 to ftmp3
3565 bshuffle(ftmp1, ftmp2, ftmp3);
3566 stf(FloatRegisterImpl::D, ftmp3, dst, 0);
3567
3568 // Increment addresses and decrement count
3569 inc(src, 16);
3570 inc(dst, 8);
3571 dec(cnt, 8);
3572
3573 cmp(cnt, 8);
3574 // annul LDX if branch is not taken to prevent access past end of string
3575 br(Assembler::greaterEqual, true, Assembler::pt, Lloop);
3576 delayed()->ldx(src, 0, tmp1);
3577
3578 // Fallback to slow version
3579 bind(Lslow);
3580 }
3581
3582 // Compress char[] to byte[]. Return 0 on failure.
3583 void MacroAssembler::string_compress(Register src, Register dst, Register cnt, Register result, Register tmp, Label& Ldone) {
3584 Label Lloop;
3585 assert_different_registers(src, dst, cnt, tmp, result);
3586
3587 lduh(src, 0, tmp);
3588
3589 bind(Lloop);
3590 inc(src, sizeof(jchar));
3591 cmp(tmp, 0xff);
3592 // annul zeroing if branch is not taken to preserve original count
3593 br(Assembler::greater, true, Assembler::pn, Ldone); // don't check xcc
3594 delayed()->mov(G0, result); // 0 - failed
3595 deccc(cnt);
3596 stb(tmp, dst, 0);
3597 inc(dst);
3598 // annul LDUH if branch is not taken to prevent access past end of string
3599 br(Assembler::notZero, true, Assembler::pt, Lloop);
3600 delayed()->lduh(src, 0, tmp); // hoisted
3601 }
3602
3603 // Inflate byte[] to char[] by inflating 16 bytes at once.
3604 void MacroAssembler::string_inflate_16(Register src, Register dst, Register cnt, Register tmp,
3605 FloatRegister ftmp1, FloatRegister ftmp2, FloatRegister ftmp3, FloatRegister ftmp4, Label& Ldone) {
3606 Label Lloop, Lslow;
3607 assert(UseVIS >= 3, "VIS3 is required");
3608 assert_different_registers(src, dst, cnt, tmp);
3609 assert_different_registers(ftmp1, ftmp2, ftmp3, ftmp4);
3610
3611 // Check if cnt >= 8 (= 16 bytes)
3612 cmp(cnt, 8);
3613 br(Assembler::less, false, Assembler::pn, Lslow);
3614 delayed()->nop();
3615
3616 // Check for 8-byte alignment of src and dst
3617 or3(src, dst, tmp);
3618 andcc(tmp, 7, G0);
3619 br(Assembler::notZero, false, Assembler::pn, Lslow);
3620 // Initialize float register to zero
3621 FloatRegister zerof = ftmp4;
3622 delayed()->fzero(FloatRegisterImpl::D, zerof);
3623
3624 // Load first 8 bytes
3625 ldf(FloatRegisterImpl::D, src, 0, ftmp1);
3626
3627 bind(Lloop);
3628 inc(src, 8);
3629 dec(cnt, 8);
3630
3631 // Inflate the string by interleaving each byte from the source array
3632 // with a zero byte and storing the result in the destination array.
3633 fpmerge(zerof, ftmp1->successor(), ftmp2);
3634 stf(FloatRegisterImpl::D, ftmp2, dst, 8);
3635 fpmerge(zerof, ftmp1, ftmp3);
3636 stf(FloatRegisterImpl::D, ftmp3, dst, 0);
3637
3638 inc(dst, 16);
3639
3640 cmp(cnt, 8);
3641 // annul LDX if branch is not taken to prevent access past end of string
3642 br(Assembler::greaterEqual, true, Assembler::pt, Lloop);
3643 delayed()->ldf(FloatRegisterImpl::D, src, 0, ftmp1);
3644
3645 // Fallback to slow version
3646 bind(Lslow);
3647 }
3648
3649 // Inflate byte[] to char[].
3650 void MacroAssembler::string_inflate(Register src, Register dst, Register cnt, Register tmp, Label& Ldone) {
3651 Label Loop;
3652 assert_different_registers(src, dst, cnt, tmp);
3653
3654 ldub(src, 0, tmp);
3655 bind(Loop);
3656 inc(src);
3657 deccc(cnt);
3658 sth(tmp, dst, 0);
3659 inc(dst, sizeof(jchar));
3660 // annul LDUB if branch is not taken to prevent access past end of string
3661 br(Assembler::notZero, true, Assembler::pt, Loop);
3662 delayed()->ldub(src, 0, tmp); // hoisted
3663 }
3664
3665 void MacroAssembler::string_compare(Register str1, Register str2,
3666 Register cnt1, Register cnt2,
3667 Register tmp1, Register tmp2,
3668 Register result, int ae) {
3669 Label Ldone, Lloop;
3670 assert_different_registers(str1, str2, cnt1, cnt2, tmp1, result);
3671 int stride1, stride2;
3672
3673 // Note: Making use of the fact that compareTo(a, b) == -compareTo(b, a)
3674 // we interchange str1 and str2 in the UL case and negate the result.
3675 // Like this, str1 is always latin1 encoded, expect for the UU case.
3676
3677 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3678 srl(cnt2, 1, cnt2);
3679 }
3680
3681 // See if the lengths are different, and calculate min in cnt1.
3682 // Save diff in case we need it for a tie-breaker.
3683 Label Lskip;
3684 Register diff = tmp1;
3685 subcc(cnt1, cnt2, diff);
3686 br(Assembler::greater, true, Assembler::pt, Lskip);
3687 // cnt2 is shorter, so use its count:
3688 delayed()->mov(cnt2, cnt1);
3689 bind(Lskip);
3690
3691 // Rename registers
3692 Register limit1 = cnt1;
3693 Register limit2 = limit1;
3694 Register chr1 = result;
3695 Register chr2 = cnt2;
3696 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3697 // We need an additional register to keep track of two limits
3698 assert_different_registers(str1, str2, cnt1, cnt2, tmp1, tmp2, result);
3699 limit2 = tmp2;
3700 }
3701
3702 // Is the minimum length zero?
3703 cmp(limit1, (int)0); // use cast to resolve overloading ambiguity
3704 br(Assembler::equal, true, Assembler::pn, Ldone);
3705 // result is difference in lengths
3706 if (ae == StrIntrinsicNode::UU) {
3707 delayed()->sra(diff, 1, result); // Divide by 2 to get number of chars
3708 } else {
3709 delayed()->mov(diff, result);
3710 }
3711
3712 // Load first characters
3713 if (ae == StrIntrinsicNode::LL) {
3714 stride1 = stride2 = sizeof(jbyte);
3715 ldub(str1, 0, chr1);
3716 ldub(str2, 0, chr2);
3717 } else if (ae == StrIntrinsicNode::UU) {
3718 stride1 = stride2 = sizeof(jchar);
3719 lduh(str1, 0, chr1);
3720 lduh(str2, 0, chr2);
3721 } else {
3722 stride1 = sizeof(jbyte);
3723 stride2 = sizeof(jchar);
3724 ldub(str1, 0, chr1);
3725 lduh(str2, 0, chr2);
3726 }
3727
3728 // Compare first characters
3729 subcc(chr1, chr2, chr1);
3730 br(Assembler::notZero, false, Assembler::pt, Ldone);
3731 assert(chr1 == result, "result must be pre-placed");
3732 delayed()->nop();
3733
3734 // Check if the strings start at same location
3735 cmp(str1, str2);
3736 brx(Assembler::equal, true, Assembler::pn, Ldone);
3737 delayed()->mov(G0, result); // result is zero
3738
3739 // We have no guarantee that on 64 bit the higher half of limit is 0
3740 signx(limit1);
3741
3742 // Get limit
3743 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3744 sll(limit1, 1, limit2);
3745 subcc(limit2, stride2, chr2);
3746 }
3747 subcc(limit1, stride1, chr1);
3748 br(Assembler::zero, true, Assembler::pn, Ldone);
3749 // result is difference in lengths
3750 if (ae == StrIntrinsicNode::UU) {
3751 delayed()->sra(diff, 1, result); // Divide by 2 to get number of chars
3752 } else {
3753 delayed()->mov(diff, result);
3754 }
3755
3756 // Shift str1 and str2 to the end of the arrays, negate limit
3757 add(str1, limit1, str1);
3758 add(str2, limit2, str2);
3759 neg(chr1, limit1); // limit1 = -(limit1-stride1)
3760 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3761 neg(chr2, limit2); // limit2 = -(limit2-stride2)
3762 }
3763
3764 // Compare the rest of the characters
3765 load_sized_value(Address(str1, limit1), chr1, (ae == StrIntrinsicNode::UU) ? 2 : 1, false);
3766
3767 bind(Lloop);
3768 load_sized_value(Address(str2, limit2), chr2, (ae == StrIntrinsicNode::LL) ? 1 : 2, false);
3769
3770 subcc(chr1, chr2, chr1);
3771 br(Assembler::notZero, false, Assembler::pt, Ldone);
3772 assert(chr1 == result, "result must be pre-placed");
3773 delayed()->inccc(limit1, stride1);
3774 if (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL) {
3775 inccc(limit2, stride2);
3776 }
3777
3778 // annul LDUB if branch is not taken to prevent access past end of string
3779 br(Assembler::notZero, true, Assembler::pt, Lloop);
3780 delayed()->load_sized_value(Address(str1, limit1), chr1, (ae == StrIntrinsicNode::UU) ? 2 : 1, false);
3781
3782 // If strings are equal up to min length, return the length difference.
3783 if (ae == StrIntrinsicNode::UU) {
3784 // Divide by 2 to get number of chars
3785 sra(diff, 1, result);
3786 } else {
3787 mov(diff, result);
3788 }
3789
3790 // Otherwise, return the difference between the first mismatched chars.
3791 bind(Ldone);
3792 if(ae == StrIntrinsicNode::UL) {
3793 // Negate result (see note above)
3794 neg(result);
3795 }
3796 }
3797
3798 void MacroAssembler::array_equals(bool is_array_equ, Register ary1, Register ary2,
3799 Register limit, Register tmp, Register result, bool is_byte) {
3800 Label Ldone, Lloop, Lremaining;
3801 assert_different_registers(ary1, ary2, limit, tmp, result);
3802
3803 int length_offset = arrayOopDesc::length_offset_in_bytes();
3804 int base_offset = arrayOopDesc::base_offset_in_bytes(is_byte ? T_BYTE : T_CHAR);
3805 assert(base_offset % 8 == 0, "Base offset must be 8-byte aligned");
3806
3807 if (is_array_equ) {
3808 // return true if the same array
3809 cmp(ary1, ary2);
3810 brx(Assembler::equal, true, Assembler::pn, Ldone);
3811 delayed()->mov(1, result); // equal
3812
3813 br_null(ary1, true, Assembler::pn, Ldone);
3814 delayed()->clr(result); // not equal
3815
3816 br_null(ary2, true, Assembler::pn, Ldone);
3817 delayed()->clr(result); // not equal
3818
3819 // load the lengths of arrays
3820 ld(Address(ary1, length_offset), limit);
3821 ld(Address(ary2, length_offset), tmp);
3822
3823 // return false if the two arrays are not equal length
3824 cmp(limit, tmp);
3825 br(Assembler::notEqual, true, Assembler::pn, Ldone);
3826 delayed()->clr(result); // not equal
3827 }
3828
3829 cmp_zero_and_br(Assembler::zero, limit, Ldone, true, Assembler::pn);
3830 delayed()->mov(1, result); // zero-length arrays are equal
3831
3832 if (is_array_equ) {
3833 // load array addresses
3834 add(ary1, base_offset, ary1);
3835 add(ary2, base_offset, ary2);
3836 // set byte count
3837 if (!is_byte) {
3838 sll(limit, exact_log2(sizeof(jchar)), limit);
3839 }
3840 } else {
3841 // We have no guarantee that on 64 bit the higher half of limit is 0
3842 signx(limit);
3843 }
3844
3845 #ifdef ASSERT
3846 // Sanity check for doubleword (8-byte) alignment of ary1 and ary2.
3847 // Guaranteed on 64-bit systems (see arrayOopDesc::header_size_in_bytes()).
3848 Label Laligned;
3849 or3(ary1, ary2, tmp);
3850 andcc(tmp, 7, tmp);
3851 br_null_short(tmp, Assembler::pn, Laligned);
3852 STOP("First array element is not 8-byte aligned.");
3853 should_not_reach_here();
3854 bind(Laligned);
3855 #endif
3856
3857 // Shift ary1 and ary2 to the end of the arrays, negate limit
3858 add(ary1, limit, ary1);
3859 add(ary2, limit, ary2);
3860 neg(limit, limit);
3861
3862 // MAIN LOOP
3863 // Load and compare array elements of size 'byte_width' until the elements are not
3864 // equal or we reached the end of the arrays. If the size of the arrays is not a
3865 // multiple of 'byte_width', we simply read over the end of the array, bail out and
3866 // compare the remaining bytes below by skipping the garbage bytes.
3867 ldx(ary1, limit, result);
3868 bind(Lloop);
3869 ldx(ary2, limit, tmp);
3870 inccc(limit, 8);
3871 // Bail out if we reached the end (but still do the comparison)
3872 br(Assembler::positive, false, Assembler::pn, Lremaining);
3873 delayed()->cmp(result, tmp);
3874 // Check equality of elements
3875 brx(Assembler::equal, false, Assembler::pt, target(Lloop));
3876 delayed()->ldx(ary1, limit, result);
3877
3878 ba(Ldone);
3879 delayed()->clr(result); // not equal
3880
3881 // TAIL COMPARISON
3882 // We got here because we reached the end of the arrays. 'limit' is the number of
3883 // garbage bytes we may have compared by reading over the end of the arrays. Shift
3884 // out the garbage and compare the remaining elements.
3885 bind(Lremaining);
3886 // Optimistic shortcut: elements potentially including garbage are equal
3887 brx(Assembler::equal, true, Assembler::pt, target(Ldone));
3888 delayed()->mov(1, result); // equal
3889 // Shift 'limit' bytes to the right and compare
3890 sll(limit, 3, limit); // bytes to bits
3891 srlx(result, limit, result);
3892 srlx(tmp, limit, tmp);
3893 cmp(result, tmp);
3894 clr(result);
3895 movcc(Assembler::equal, false, xcc, 1, result);
3896
3897 bind(Ldone);
3898 }
3899
3900 void MacroAssembler::has_negatives(Register inp, Register size, Register result, Register t2, Register t3, Register t4, Register t5) {
3901
3902 // test for negative bytes in input string of a given size
3903 // result 1 if found, 0 otherwise.
3904
3905 Label Lcore, Ltail, Lreturn, Lcore_rpt;
3906
3907 assert_different_registers(inp, size, t2, t3, t4, t5, result);
3908
3909 Register i = result; // result used as integer index i until very end
3910 Register lmask = t2; // t2 is aliased to lmask
3911
3912 // INITIALIZATION
3913 // ===========================================================
3914 // initialize highbits mask -> lmask = 0x8080808080808080 (8B/64b)
3915 // compute unaligned offset -> i
3916 // compute core end index -> t5
3917 Assembler::sethi(0x80808000, t2); //! sethi macro fails to emit optimal
3918 add(t2, 0x80, t2);
3919 sllx(t2, 32, t3);
3920 or3(t3, t2, lmask); // 0x8080808080808080 -> lmask
3921 sra(size,0,size);
3922 andcc(inp, 0x7, i); // unaligned offset -> i
3923 br(Assembler::zero, true, Assembler::pn, Lcore); // starts 8B aligned?
3924 delayed()->add(size, -8, t5); // (annuled) core end index -> t5
3925
3926 // ===========================================================
3927
3928 // UNALIGNED HEAD
3929 // ===========================================================
3930 // * unaligned head handling: grab aligned 8B containing unaligned inp(ut)
3931 // * obliterate (ignore) bytes outside string by shifting off reg ends
3932 // * compare with bitmask, short circuit return true if one or more high
3933 // bits set.
3934 cmp(size, 0);
3935 br(Assembler::zero, true, Assembler::pn, Lreturn); // short-circuit?
3936 delayed()->mov(0,result); // annuled so i not clobbered for following
3937 neg(i, t4);
3938 add(i, size, t5);
3939 ldx(inp, t4, t3); // raw aligned 8B containing unaligned head -> t3
3940 mov(8, t4);
3941 sub(t4, t5, t4);
3942 sra(t4, 31, t5);
3943 andn(t4, t5, t5);
3944 add(i, t5, t4);
3945 sll(t5, 3, t5);
3946 sll(t4, 3, t4); // # bits to shift right, left -> t5,t4
3947 srlx(t3, t5, t3);
3948 sllx(t3, t4, t3); // bytes outside string in 8B header obliterated -> t3
3949 andcc(lmask, t3, G0);
3950 brx(Assembler::notZero, true, Assembler::pn, Lreturn); // short circuit?
3951 delayed()->mov(1,result); // annuled so i not clobbered for following
3952 add(size, -8, t5); // core end index -> t5
3953 mov(8, t4);
3954 sub(t4, i, i); // # bytes examined in unalgn head (<8) -> i
3955 // ===========================================================
3956
3957 // ALIGNED CORE
3958 // ===========================================================
3959 // * iterate index i over aligned 8B sections of core, comparing with
3960 // bitmask, short circuit return true if one or more high bits set
3961 // t5 contains core end index/loop limit which is the index
3962 // of the MSB of last (unaligned) 8B fully contained in the string.
3963 // inp contains address of first byte in string/array
3964 // lmask contains 8B high bit mask for comparison
3965 // i contains next index to be processed (adr. inp+i is on 8B boundary)
3966 bind(Lcore);
3967 cmp_and_br_short(i, t5, Assembler::greater, Assembler::pn, Ltail);
3968 bind(Lcore_rpt);
3969 ldx(inp, i, t3);
3970 andcc(t3, lmask, G0);
3971 brx(Assembler::notZero, true, Assembler::pn, Lreturn);
3972 delayed()->mov(1, result); // annuled so i not clobbered for following
3973 add(i, 8, i);
3974 cmp_and_br_short(i, t5, Assembler::lessEqual, Assembler::pn, Lcore_rpt);
3975 // ===========================================================
3976
3977 // ALIGNED TAIL (<8B)
3978 // ===========================================================
3979 // handle aligned tail of 7B or less as complete 8B, obliterating end of
3980 // string bytes by shifting them off end, compare what's left with bitmask
3981 // inp contains address of first byte in string/array
3982 // lmask contains 8B high bit mask for comparison
3983 // i contains next index to be processed (adr. inp+i is on 8B boundary)
3984 bind(Ltail);
3985 subcc(size, i, t4); // # of remaining bytes in string -> t4
3986 // return 0 if no more remaining bytes
3987 br(Assembler::lessEqual, true, Assembler::pn, Lreturn);
3988 delayed()->mov(0, result); // annuled so i not clobbered for following
3989 ldx(inp, i, t3); // load final 8B (aligned) containing tail -> t3
3990 mov(8, t5);
3991 sub(t5, t4, t4);
3992 mov(0, result); // ** i clobbered at this point
3993 sll(t4, 3, t4); // bits beyond end of string -> t4
3994 srlx(t3, t4, t3); // bytes beyond end now obliterated -> t3
3995 andcc(lmask, t3, G0);
3996 movcc(Assembler::notZero, false, xcc, 1, result);
3997 bind(Lreturn);
3998 }
3999
4000 #endif
4001
4002
4003 // Use BIS for zeroing (count is in bytes).
4004 void MacroAssembler::bis_zeroing(Register to, Register count, Register temp, Label& Ldone) {
4005 assert(UseBlockZeroing && VM_Version::has_blk_zeroing(), "only works with BIS zeroing");
4006 Register end = count;
4007 int cache_line_size = VM_Version::prefetch_data_size();
4008 assert(cache_line_size > 0, "cache line size should be known for this code");
4009 // Minimum count when BIS zeroing can be used since
4010 // it needs membar which is expensive.
4011 int block_zero_size = MAX2(cache_line_size*3, (int)BlockZeroingLowLimit);
4012
4013 Label small_loop;
4014 // Check if count is negative (dead code) or zero.
4015 // Note, count uses 64bit in 64 bit VM.
4016 cmp_and_brx_short(count, 0, Assembler::lessEqual, Assembler::pn, Ldone);
4017
4018 // Use BIS zeroing only for big arrays since it requires membar.
4019 if (Assembler::is_simm13(block_zero_size)) { // < 4096
4020 cmp(count, block_zero_size);
4021 } else {
4022 set(block_zero_size, temp);
4023 cmp(count, temp);
4024 }
4025 br(Assembler::lessUnsigned, false, Assembler::pt, small_loop);
4026 delayed()->add(to, count, end);
4027
4028 // Note: size is >= three (32 bytes) cache lines.
4029
4030 // Clean the beginning of space up to next cache line.
4031 for (int offs = 0; offs < cache_line_size; offs += 8) {
4032 stx(G0, to, offs);
4033 }
4034
4035 // align to next cache line
4036 add(to, cache_line_size, to);
4037 and3(to, -cache_line_size, to);
4038
4039 // Note: size left >= two (32 bytes) cache lines.
4040
4041 // BIS should not be used to zero tail (64 bytes)
4042 // to avoid zeroing a header of the following object.
4043 sub(end, (cache_line_size*2)-8, end);
4044
4045 Label bis_loop;
4046 bind(bis_loop);
4047 stxa(G0, to, G0, Assembler::ASI_ST_BLKINIT_PRIMARY);
4048 add(to, cache_line_size, to);
4049 cmp_and_brx_short(to, end, Assembler::lessUnsigned, Assembler::pt, bis_loop);
4050
4051 // BIS needs membar.
4052 membar(Assembler::StoreLoad);
4053
4054 add(end, (cache_line_size*2)-8, end); // restore end
4055 cmp_and_brx_short(to, end, Assembler::greaterEqualUnsigned, Assembler::pn, Ldone);
4056
4057 // Clean the tail.
4058 bind(small_loop);
4059 stx(G0, to, 0);
4060 add(to, 8, to);
4061 cmp_and_brx_short(to, end, Assembler::lessUnsigned, Assembler::pt, small_loop);
4062 nop(); // Separate short branches
4063 }
4064
4065 /**
4066 * Update CRC-32[C] with a byte value according to constants in table
4067 *
4068 * @param [in,out]crc Register containing the crc.
4069 * @param [in]val Register containing the byte to fold into the CRC.
4070 * @param [in]table Register containing the table of crc constants.
4071 *
4072 * uint32_t crc;
4073 * val = crc_table[(val ^ crc) & 0xFF];
4074 * crc = val ^ (crc >> 8);
4075 */
4076 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) {
4077 xor3(val, crc, val);
4078 and3(val, 0xFF, val);
4079 sllx(val, 2, val);
4080 lduw(table, val, val);
4081 srlx(crc, 8, crc);
4082 xor3(val, crc, crc);
4083 }
4084
4085 // Reverse byte order of lower 32 bits, assuming upper 32 bits all zeros
4086 void MacroAssembler::reverse_bytes_32(Register src, Register dst, Register tmp) {
4087 srlx(src, 24, dst);
4088
4089 sllx(src, 32+8, tmp);
4090 srlx(tmp, 32+24, tmp);
4091 sllx(tmp, 8, tmp);
4092 or3(dst, tmp, dst);
4093
4094 sllx(src, 32+16, tmp);
4095 srlx(tmp, 32+24, tmp);
4096 sllx(tmp, 16, tmp);
4097 or3(dst, tmp, dst);
4098
4099 sllx(src, 32+24, tmp);
4100 srlx(tmp, 32, tmp);
4101 or3(dst, tmp, dst);
4102 }
4103
4104 void MacroAssembler::movitof_revbytes(Register src, FloatRegister dst, Register tmp1, Register tmp2) {
4105 reverse_bytes_32(src, tmp1, tmp2);
4106 movxtod(tmp1, dst);
4107 }
4108
4109 void MacroAssembler::movftoi_revbytes(FloatRegister src, Register dst, Register tmp1, Register tmp2) {
4110 movdtox(src, tmp1);
4111 reverse_bytes_32(tmp1, dst, tmp2);
4112 }
4113
4114 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) {
4115 xmulx(xcrc_hi, xK_hi, xtmp_lo);
4116 xmulxhi(xcrc_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, xtmp_lo, xcrc_lo);
4120 xor3(xcrc_hi, xtmp_hi, xcrc_hi);
4121 ldxl(buf, G0, xtmp_lo);
4122 inc(buf, 8);
4123 ldxl(buf, G0, xtmp_hi);
4124 inc(buf, 8);
4125 xor3(xcrc_lo, xtmp_lo, xcrc_lo);
4126 xor3(xcrc_hi, xtmp_hi, xcrc_hi);
4127 }
4128
4129 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) {
4130 mov(xcrc_lo, xtmp_lo);
4131 mov(xcrc_hi, xtmp_hi);
4132 xmulx(xtmp_hi, xK_hi, xtmp_lo);
4133 xmulxhi(xtmp_hi, xK_hi, xtmp_hi);
4134 xmulxhi(xcrc_lo, xK_lo, xcrc_hi);
4135 xmulx(xcrc_lo, xK_lo, xcrc_lo);
4136 xor3(xcrc_lo, xbuf_lo, xcrc_lo);
4137 xor3(xcrc_hi, xbuf_hi, xcrc_hi);
4138 xor3(xcrc_lo, xtmp_lo, xcrc_lo);
4139 xor3(xcrc_hi, xtmp_hi, xcrc_hi);
4140 }
4141
4142 void MacroAssembler::fold_8bit_crc32(Register xcrc, Register table, Register xtmp, Register tmp) {
4143 and3(xcrc, 0xFF, tmp);
4144 sllx(tmp, 2, tmp);
4145 lduw(table, tmp, xtmp);
4146 srlx(xcrc, 8, xcrc);
4147 xor3(xtmp, xcrc, xcrc);
4148 }
4149
4150 void MacroAssembler::fold_8bit_crc32(Register crc, Register table, Register tmp) {
4151 and3(crc, 0xFF, tmp);
4152 srlx(crc, 8, crc);
4153 sllx(tmp, 2, tmp);
4154 lduw(table, tmp, tmp);
4155 xor3(tmp, crc, crc);
4156 }
4157
4158 #define CRC32_TMP_REG_NUM 18
4159
4160 #define CRC32_CONST_64 0x163cd6124
4161 #define CRC32_CONST_96 0x0ccaa009e
4162 #define CRC32_CONST_160 0x1751997d0
4163 #define CRC32_CONST_480 0x1c6e41596
4164 #define CRC32_CONST_544 0x154442bd4
4165
4166 void MacroAssembler::kernel_crc32(Register crc, Register buf, Register len, Register table) {
4167
4168 Label L_cleanup_loop, L_cleanup_check, L_align_loop, L_align_check;
4169 Label L_main_loop_prologue;
4170 Label L_fold_512b, L_fold_512b_loop, L_fold_128b;
4171 Label L_fold_tail, L_fold_tail_loop;
4172 Label L_8byte_fold_check;
4173
4174 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};
4175
4176 Register const_64 = tmp[CRC32_TMP_REG_NUM-1];
4177 Register const_96 = tmp[CRC32_TMP_REG_NUM-1];
4178 Register const_160 = tmp[CRC32_TMP_REG_NUM-2];
4179 Register const_480 = tmp[CRC32_TMP_REG_NUM-1];
4180 Register const_544 = tmp[CRC32_TMP_REG_NUM-2];
4181
4182 set(ExternalAddress(StubRoutines::crc_table_addr()), table);
4183
4184 not1(crc); // ~c
4185 clruwu(crc); // clear upper 32 bits of crc
4186
4187 // Check if below cutoff, proceed directly to cleanup code
4188 mov(31, G4);
4189 cmp_and_br_short(len, G4, Assembler::lessEqualUnsigned, Assembler::pt, L_cleanup_check);
4190
4191 // Align buffer to 8 byte boundry
4192 mov(8, O5);
4193 and3(buf, 0x7, O4);
4194 sub(O5, O4, O5);
4195 and3(O5, 0x7, O5);
4196 sub(len, O5, len);
4197 ba(L_align_check);
4198 delayed()->nop();
4199
4200 // Alignment loop, table look up method for up to 7 bytes
4201 bind(L_align_loop);
4202 ldub(buf, 0, O4);
4203 inc(buf);
4204 dec(O5);
4205 xor3(O4, crc, O4);
4206 and3(O4, 0xFF, O4);
4207 sllx(O4, 2, O4);
4208 lduw(table, O4, O4);
4209 srlx(crc, 8, crc);
4210 xor3(O4, crc, crc);
4211 bind(L_align_check);
4212 nop();
4213 cmp_and_br_short(O5, 0, Assembler::notEqual, Assembler::pt, L_align_loop);
4214
4215 // Aligned on 64-bit (8-byte) boundry at this point
4216 // Check if still above cutoff (31-bytes)
4217 mov(31, G4);
4218 cmp_and_br_short(len, G4, Assembler::lessEqualUnsigned, Assembler::pt, L_cleanup_check);
4219 // At least 32 bytes left to process
4220
4221 // Free up registers by storing them to FP registers
4222 for (int i = 0; i < CRC32_TMP_REG_NUM; i++) {
4223 movxtod(tmp[i], as_FloatRegister(2*i));
4224 }
4225
4226 // Determine which loop to enter
4227 // Shared prologue
4228 ldxl(buf, G0, tmp[0]);
4229 inc(buf, 8);
4230 ldxl(buf, G0, tmp[1]);
4231 inc(buf, 8);
4232 xor3(tmp[0], crc, tmp[0]); // Fold CRC into first few bytes
4233 and3(crc, 0, crc); // Clear out the crc register
4234 // Main loop needs 128-bytes at least
4235 mov(128, G4);
4236 mov(64, tmp[2]);
4237 cmp_and_br_short(len, G4, Assembler::greaterEqualUnsigned, Assembler::pt, L_main_loop_prologue);
4238 // Less than 64 bytes
4239 nop();
4240 cmp_and_br_short(len, tmp[2], Assembler::lessUnsigned, Assembler::pt, L_fold_tail);
4241 // Between 64 and 127 bytes
4242 set64(CRC32_CONST_96, const_96, tmp[8]);
4243 set64(CRC32_CONST_160, const_160, tmp[9]);
4244 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[2], tmp[3], buf, 0);
4245 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[4], tmp[5], buf, 16);
4246 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[6], tmp[7], buf, 32);
4247 dec(len, 48);
4248 ba(L_fold_tail);
4249 delayed()->nop();
4250
4251 bind(L_main_loop_prologue);
4252 for (int i = 2; i < 8; i++) {
4253 ldxl(buf, G0, tmp[i]);
4254 inc(buf, 8);
4255 }
4256
4257 // Fold total 512 bits of polynomial on each iteration,
4258 // 128 bits per each of 4 parallel streams
4259 set64(CRC32_CONST_480, const_480, tmp[8]);
4260 set64(CRC32_CONST_544, const_544, tmp[9]);
4261
4262 mov(128, G4);
4263 bind(L_fold_512b_loop);
4264 fold_128bit_crc32(tmp[1], tmp[0], const_480, const_544, tmp[9], tmp[8], buf, 0);
4265 fold_128bit_crc32(tmp[3], tmp[2], const_480, const_544, tmp[11], tmp[10], buf, 16);
4266 fold_128bit_crc32(tmp[5], tmp[4], const_480, const_544, tmp[13], tmp[12], buf, 32);
4267 fold_128bit_crc32(tmp[7], tmp[6], const_480, const_544, tmp[15], tmp[14], buf, 64);
4268 dec(len, 64);
4269 cmp_and_br_short(len, G4, Assembler::greaterEqualUnsigned, Assembler::pt, L_fold_512b_loop);
4270
4271 // Fold 512 bits to 128 bits
4272 bind(L_fold_512b);
4273 set64(CRC32_CONST_96, const_96, tmp[8]);
4274 set64(CRC32_CONST_160, const_160, tmp[9]);
4275
4276 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[8], tmp[9], tmp[3], tmp[2]);
4277 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[8], tmp[9], tmp[5], tmp[4]);
4278 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[8], tmp[9], tmp[7], tmp[6]);
4279 dec(len, 48);
4280
4281 // Fold the rest of 128 bits data chunks
4282 bind(L_fold_tail);
4283 mov(32, G4);
4284 cmp_and_br_short(len, G4, Assembler::lessEqualUnsigned, Assembler::pt, L_fold_128b);
4285
4286 set64(CRC32_CONST_96, const_96, tmp[8]);
4287 set64(CRC32_CONST_160, const_160, tmp[9]);
4288
4289 bind(L_fold_tail_loop);
4290 fold_128bit_crc32(tmp[1], tmp[0], const_96, const_160, tmp[2], tmp[3], buf, 0);
4291 sub(len, 16, len);
4292 cmp_and_br_short(len, G4, Assembler::greaterEqualUnsigned, Assembler::pt, L_fold_tail_loop);
4293
4294 // Fold the 128 bits in tmps 0 - 1 into tmp 1
4295 bind(L_fold_128b);
4296
4297 set64(CRC32_CONST_64, const_64, tmp[4]);
4298
4299 xmulx(const_64, tmp[0], tmp[2]);
4300 xmulxhi(const_64, tmp[0], tmp[3]);
4301
4302 srl(tmp[2], G0, tmp[4]);
4303 xmulx(const_64, tmp[4], tmp[4]);
4304
4305 srlx(tmp[2], 32, tmp[2]);
4306 sllx(tmp[3], 32, tmp[3]);
4307 or3(tmp[2], tmp[3], tmp[2]);
4308
4309 xor3(tmp[4], tmp[1], tmp[4]);
4310 xor3(tmp[4], tmp[2], tmp[1]);
4311 dec(len, 8);
4312
4313 // Use table lookup for the 8 bytes left in tmp[1]
4314 dec(len, 8);
4315
4316 // 8 8-bit folds to compute 32-bit CRC.
4317 for (int j = 0; j < 4; j++) {
4318 fold_8bit_crc32(tmp[1], table, tmp[2], tmp[3]);
4319 }
4320 srl(tmp[1], G0, crc); // move 32 bits to general register
4321 for (int j = 0; j < 4; j++) {
4322 fold_8bit_crc32(crc, table, tmp[3]);
4323 }
4324
4325 bind(L_8byte_fold_check);
4326
4327 // Restore int registers saved in FP registers
4328 for (int i = 0; i < CRC32_TMP_REG_NUM; i++) {
4329 movdtox(as_FloatRegister(2*i), tmp[i]);
4330 }
4331
4332 ba(L_cleanup_check);
4333 delayed()->nop();
4334
4335 // Table look-up method for the remaining few bytes
4336 bind(L_cleanup_loop);
4337 ldub(buf, 0, O4);
4338 inc(buf);
4339 dec(len);
4340 xor3(O4, crc, O4);
4341 and3(O4, 0xFF, O4);
4342 sllx(O4, 2, O4);
4343 lduw(table, O4, O4);
4344 srlx(crc, 8, crc);
4345 xor3(O4, crc, crc);
4346 bind(L_cleanup_check);
4347 nop();
4348 cmp_and_br_short(len, 0, Assembler::greaterUnsigned, Assembler::pt, L_cleanup_loop);
4349
4350 not1(crc);
4351 }
4352
4353 #define CHUNK_LEN 128 /* 128 x 8B = 1KB */
4354 #define CHUNK_K1 0x1307a0206 /* reverseBits(pow(x, CHUNK_LEN*8*8*3 - 32) mod P(x)) << 1 */
4355 #define CHUNK_K2 0x1a0f717c4 /* reverseBits(pow(x, CHUNK_LEN*8*8*2 - 32) mod P(x)) << 1 */
4356 #define CHUNK_K3 0x0170076fa /* reverseBits(pow(x, CHUNK_LEN*8*8*1 - 32) mod P(x)) << 1 */
4357
4358 void MacroAssembler::kernel_crc32c(Register crc, Register buf, Register len, Register table) {
4359
4360 Label L_crc32c_head, L_crc32c_aligned;
4361 Label L_crc32c_parallel, L_crc32c_parallel_loop;
4362 Label L_crc32c_serial, L_crc32c_x32_loop, L_crc32c_x8, L_crc32c_x8_loop;
4363 Label L_crc32c_done, L_crc32c_tail, L_crc32c_return;
4364
4365 set(ExternalAddress(StubRoutines::crc32c_table_addr()), table);
4366
4367 cmp_and_br_short(len, 0, Assembler::lessEqual, Assembler::pn, L_crc32c_return);
4368
4369 // clear upper 32 bits of crc
4370 clruwu(crc);
4371
4372 and3(buf, 7, G4);
4373 cmp_and_brx_short(G4, 0, Assembler::equal, Assembler::pt, L_crc32c_aligned);
4374
4375 mov(8, G1);
4376 sub(G1, G4, G4);
4377
4378 // ------ process the misaligned head (7 bytes or less) ------
4379 bind(L_crc32c_head);
4380
4381 // crc = (crc >>> 8) ^ byteTable[(crc ^ b) & 0xFF];
4382 ldub(buf, 0, G1);
4383 update_byte_crc32(crc, G1, table);
4384
4385 inc(buf);
4386 dec(len);
4387 cmp_and_br_short(len, 0, Assembler::equal, Assembler::pn, L_crc32c_return);
4388 dec(G4);
4389 cmp_and_br_short(G4, 0, Assembler::greater, Assembler::pt, L_crc32c_head);
4390
4391 // ------ process the 8-byte-aligned body ------
4392 bind(L_crc32c_aligned);
4393 nop();
4394 cmp_and_br_short(len, 8, Assembler::less, Assembler::pn, L_crc32c_tail);
4395
4396 // reverse the byte order of lower 32 bits to big endian, and move to FP side
4397 movitof_revbytes(crc, F0, G1, G3);
4398
4399 set(CHUNK_LEN*8*4, G4);
4400 cmp_and_br_short(len, G4, Assembler::less, Assembler::pt, L_crc32c_serial);
4401
4402 // ------ process four 1KB chunks in parallel ------
4403 bind(L_crc32c_parallel);
4404
4405 fzero(FloatRegisterImpl::D, F2);
4406 fzero(FloatRegisterImpl::D, F4);
4407 fzero(FloatRegisterImpl::D, F6);
4408
4409 mov(CHUNK_LEN - 1, G4);
4410 bind(L_crc32c_parallel_loop);
4411 // schedule ldf's ahead of crc32c's to hide the load-use latency
4412 ldf(FloatRegisterImpl::D, buf, 0, F8);
4413 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*8, F10);
4414 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*16, F12);
4415 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*24, F14);
4416 crc32c(F0, F8, F0);
4417 crc32c(F2, F10, F2);
4418 crc32c(F4, F12, F4);
4419 crc32c(F6, F14, F6);
4420 inc(buf, 8);
4421 dec(G4);
4422 cmp_and_br_short(G4, 0, Assembler::greater, Assembler::pt, L_crc32c_parallel_loop);
4423
4424 ldf(FloatRegisterImpl::D, buf, 0, F8);
4425 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*8, F10);
4426 ldf(FloatRegisterImpl::D, buf, CHUNK_LEN*16, F12);
4427 crc32c(F0, F8, F0);
4428 crc32c(F2, F10, F2);
4429 crc32c(F4, F12, F4);
4430
4431 inc(buf, CHUNK_LEN*24);
4432 ldfl(FloatRegisterImpl::D, buf, G0, F14); // load in little endian
4433 inc(buf, 8);
4434
4435 prefetch(buf, 0, Assembler::severalReads);
4436 prefetch(buf, CHUNK_LEN*8, Assembler::severalReads);
4437 prefetch(buf, CHUNK_LEN*16, Assembler::severalReads);
4438 prefetch(buf, CHUNK_LEN*24, Assembler::severalReads);
4439
4440 // move to INT side, and reverse the byte order of lower 32 bits to little endian
4441 movftoi_revbytes(F0, O4, G1, G4);
4442 movftoi_revbytes(F2, O5, G1, G4);
4443 movftoi_revbytes(F4, G5, G1, G4);
4444
4445 // combine the results of 4 chunks
4446 set64(CHUNK_K1, G3, G1);
4447 xmulx(O4, G3, O4);
4448 set64(CHUNK_K2, G3, G1);
4449 xmulx(O5, G3, O5);
4450 set64(CHUNK_K3, G3, G1);
4451 xmulx(G5, G3, G5);
4452
4453 movdtox(F14, G4);
4454 xor3(O4, O5, O5);
4455 xor3(G5, O5, O5);
4456 xor3(G4, O5, O5);
4457
4458 // reverse the byte order to big endian, via stack, and move to FP side
4459 // TODO: use new revb instruction
4460 add(SP, -8, G1);
4461 srlx(G1, 3, G1);
4462 sllx(G1, 3, G1);
4463 stx(O5, G1, G0);
4464 ldfl(FloatRegisterImpl::D, G1, G0, F2); // load in little endian
4465
4466 crc32c(F6, F2, F0);
4467
4468 set(CHUNK_LEN*8*4, G4);
4469 sub(len, G4, len);
4470 cmp_and_br_short(len, G4, Assembler::greaterEqual, Assembler::pt, L_crc32c_parallel);
4471 nop();
4472 cmp_and_br_short(len, 0, Assembler::equal, Assembler::pt, L_crc32c_done);
4473
4474 bind(L_crc32c_serial);
4475
4476 mov(32, G4);
4477 cmp_and_br_short(len, G4, Assembler::less, Assembler::pn, L_crc32c_x8);
4478
4479 // ------ process 32B chunks ------
4480 bind(L_crc32c_x32_loop);
4481 ldf(FloatRegisterImpl::D, buf, 0, F2);
4482 crc32c(F0, F2, F0);
4483 ldf(FloatRegisterImpl::D, buf, 8, F2);
4484 crc32c(F0, F2, F0);
4485 ldf(FloatRegisterImpl::D, buf, 16, F2);
4486 crc32c(F0, F2, F0);
4487 ldf(FloatRegisterImpl::D, buf, 24, F2);
4488 inc(buf, 32);
4489 crc32c(F0, F2, F0);
4490 dec(len, 32);
4491 cmp_and_br_short(len, G4, Assembler::greaterEqual, Assembler::pt, L_crc32c_x32_loop);
4492
4493 bind(L_crc32c_x8);
4494 nop();
4495 cmp_and_br_short(len, 8, Assembler::less, Assembler::pt, L_crc32c_done);
4496
4497 // ------ process 8B chunks ------
4498 bind(L_crc32c_x8_loop);
4499 ldf(FloatRegisterImpl::D, buf, 0, F2);
4500 inc(buf, 8);
4501 crc32c(F0, F2, F0);
4502 dec(len, 8);
4503 cmp_and_br_short(len, 8, Assembler::greaterEqual, Assembler::pt, L_crc32c_x8_loop);
4504
4505 bind(L_crc32c_done);
4506
4507 // move to INT side, and reverse the byte order of lower 32 bits to little endian
4508 movftoi_revbytes(F0, crc, G1, G3);
4509
4510 cmp_and_br_short(len, 0, Assembler::equal, Assembler::pt, L_crc32c_return);
4511
4512 // ------ process the misaligned tail (7 bytes or less) ------
4513 bind(L_crc32c_tail);
4514
4515 // crc = (crc >>> 8) ^ byteTable[(crc ^ b) & 0xFF];
4516 ldub(buf, 0, G1);
4517 update_byte_crc32(crc, G1, table);
4518
4519 inc(buf);
4520 dec(len);
4521 cmp_and_br_short(len, 0, Assembler::greater, Assembler::pt, L_crc32c_tail);
4522
4523 bind(L_crc32c_return);
4524 nop();
4525 }