Fri, 20 Mar 2009 23:19:36 -0700
6814659: separable cleanups and subroutines for 6655638
Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_assembler_sparc.cpp.incl"
28 // Implementation of Address
30 Address::Address( addr_type t, int which ) {
31 switch (t) {
32 case extra_in_argument:
33 case extra_out_argument:
34 _base = t == extra_in_argument ? FP : SP;
35 _hi = 0;
36 // Warning: In LP64 mode, _disp will occupy more than 10 bits.
37 // This is inconsistent with the other constructors but op
38 // codes such as ld or ldx, only access disp() to get their
39 // simm13 argument.
40 _disp = ((which - Argument::n_register_parameters + frame::memory_parameter_word_sp_offset) * BytesPerWord) + STACK_BIAS;
41 break;
42 default:
43 ShouldNotReachHere();
44 break;
45 }
46 }
48 static const char* argumentNames[][2] = {
49 {"A0","P0"}, {"A1","P1"}, {"A2","P2"}, {"A3","P3"}, {"A4","P4"},
50 {"A5","P5"}, {"A6","P6"}, {"A7","P7"}, {"A8","P8"}, {"A9","P9"},
51 {"A(n>9)","P(n>9)"}
52 };
54 const char* Argument::name() const {
55 int nofArgs = sizeof argumentNames / sizeof argumentNames[0];
56 int num = number();
57 if (num >= nofArgs) num = nofArgs - 1;
58 return argumentNames[num][is_in() ? 1 : 0];
59 }
61 void Assembler::print_instruction(int inst) {
62 const char* s;
63 switch (inv_op(inst)) {
64 default: s = "????"; break;
65 case call_op: s = "call"; break;
66 case branch_op:
67 switch (inv_op2(inst)) {
68 case bpr_op2: s = "bpr"; break;
69 case fb_op2: s = "fb"; break;
70 case fbp_op2: s = "fbp"; break;
71 case br_op2: s = "br"; break;
72 case bp_op2: s = "bp"; break;
73 case cb_op2: s = "cb"; break;
74 default: s = "????"; break;
75 }
76 }
77 ::tty->print("%s", s);
78 }
81 // Patch instruction inst at offset inst_pos to refer to dest_pos
82 // and return the resulting instruction.
83 // We should have pcs, not offsets, but since all is relative, it will work out
84 // OK.
85 int Assembler::patched_branch(int dest_pos, int inst, int inst_pos) {
87 int m; // mask for displacement field
88 int v; // new value for displacement field
89 const int word_aligned_ones = -4;
90 switch (inv_op(inst)) {
91 default: ShouldNotReachHere();
92 case call_op: m = wdisp(word_aligned_ones, 0, 30); v = wdisp(dest_pos, inst_pos, 30); break;
93 case branch_op:
94 switch (inv_op2(inst)) {
95 case bpr_op2: m = wdisp16(word_aligned_ones, 0); v = wdisp16(dest_pos, inst_pos); break;
96 case fbp_op2: m = wdisp( word_aligned_ones, 0, 19); v = wdisp( dest_pos, inst_pos, 19); break;
97 case bp_op2: m = wdisp( word_aligned_ones, 0, 19); v = wdisp( dest_pos, inst_pos, 19); break;
98 case fb_op2: m = wdisp( word_aligned_ones, 0, 22); v = wdisp( dest_pos, inst_pos, 22); break;
99 case br_op2: m = wdisp( word_aligned_ones, 0, 22); v = wdisp( dest_pos, inst_pos, 22); break;
100 case cb_op2: m = wdisp( word_aligned_ones, 0, 22); v = wdisp( dest_pos, inst_pos, 22); break;
101 default: ShouldNotReachHere();
102 }
103 }
104 return inst & ~m | v;
105 }
107 // Return the offset of the branch destionation of instruction inst
108 // at offset pos.
109 // Should have pcs, but since all is relative, it works out.
110 int Assembler::branch_destination(int inst, int pos) {
111 int r;
112 switch (inv_op(inst)) {
113 default: ShouldNotReachHere();
114 case call_op: r = inv_wdisp(inst, pos, 30); break;
115 case branch_op:
116 switch (inv_op2(inst)) {
117 case bpr_op2: r = inv_wdisp16(inst, pos); break;
118 case fbp_op2: r = inv_wdisp( inst, pos, 19); break;
119 case bp_op2: r = inv_wdisp( inst, pos, 19); break;
120 case fb_op2: r = inv_wdisp( inst, pos, 22); break;
121 case br_op2: r = inv_wdisp( inst, pos, 22); break;
122 case cb_op2: r = inv_wdisp( inst, pos, 22); break;
123 default: ShouldNotReachHere();
124 }
125 }
126 return r;
127 }
129 int AbstractAssembler::code_fill_byte() {
130 return 0x00; // illegal instruction 0x00000000
131 }
133 Assembler::Condition Assembler::reg_cond_to_cc_cond(Assembler::RCondition in) {
134 switch (in) {
135 case rc_z: return equal;
136 case rc_lez: return lessEqual;
137 case rc_lz: return less;
138 case rc_nz: return notEqual;
139 case rc_gz: return greater;
140 case rc_gez: return greaterEqual;
141 default:
142 ShouldNotReachHere();
143 }
144 return equal;
145 }
147 // Generate a bunch 'o stuff (including v9's
148 #ifndef PRODUCT
149 void Assembler::test_v9() {
150 add( G0, G1, G2 );
151 add( G3, 0, G4 );
153 addcc( G5, G6, G7 );
154 addcc( I0, 1, I1 );
155 addc( I2, I3, I4 );
156 addc( I5, -1, I6 );
157 addccc( I7, L0, L1 );
158 addccc( L2, (1 << 12) - 2, L3 );
160 Label lbl1, lbl2, lbl3;
162 bind(lbl1);
164 bpr( rc_z, true, pn, L4, pc(), relocInfo::oop_type );
165 delayed()->nop();
166 bpr( rc_lez, false, pt, L5, lbl1);
167 delayed()->nop();
169 fb( f_never, true, pc() + 4, relocInfo::none);
170 delayed()->nop();
171 fb( f_notEqual, false, lbl2 );
172 delayed()->nop();
174 fbp( f_notZero, true, fcc0, pn, pc() - 4, relocInfo::none);
175 delayed()->nop();
176 fbp( f_lessOrGreater, false, fcc1, pt, lbl3 );
177 delayed()->nop();
179 br( equal, true, pc() + 1024, relocInfo::none);
180 delayed()->nop();
181 br( lessEqual, false, lbl1 );
182 delayed()->nop();
183 br( never, false, lbl1 );
184 delayed()->nop();
186 bp( less, true, icc, pn, pc(), relocInfo::none);
187 delayed()->nop();
188 bp( lessEqualUnsigned, false, xcc, pt, lbl2 );
189 delayed()->nop();
191 call( pc(), relocInfo::none);
192 delayed()->nop();
193 call( lbl3 );
194 delayed()->nop();
197 casa( L6, L7, O0 );
198 casxa( O1, O2, O3, 0 );
200 udiv( O4, O5, O7 );
201 udiv( G0, (1 << 12) - 1, G1 );
202 sdiv( G1, G2, G3 );
203 sdiv( G4, -((1 << 12) - 1), G5 );
204 udivcc( G6, G7, I0 );
205 udivcc( I1, -((1 << 12) - 2), I2 );
206 sdivcc( I3, I4, I5 );
207 sdivcc( I6, -((1 << 12) - 0), I7 );
209 done();
210 retry();
212 fadd( FloatRegisterImpl::S, F0, F1, F2 );
213 fsub( FloatRegisterImpl::D, F34, F0, F62 );
215 fcmp( FloatRegisterImpl::Q, fcc0, F0, F60);
216 fcmpe( FloatRegisterImpl::S, fcc1, F31, F30);
218 ftox( FloatRegisterImpl::D, F2, F4 );
219 ftoi( FloatRegisterImpl::Q, F4, F8 );
221 ftof( FloatRegisterImpl::S, FloatRegisterImpl::Q, F3, F12 );
223 fxtof( FloatRegisterImpl::S, F4, F5 );
224 fitof( FloatRegisterImpl::D, F6, F8 );
226 fmov( FloatRegisterImpl::Q, F16, F20 );
227 fneg( FloatRegisterImpl::S, F6, F7 );
228 fabs( FloatRegisterImpl::D, F10, F12 );
230 fmul( FloatRegisterImpl::Q, F24, F28, F32 );
231 fmul( FloatRegisterImpl::S, FloatRegisterImpl::D, F8, F9, F14 );
232 fdiv( FloatRegisterImpl::S, F10, F11, F12 );
234 fsqrt( FloatRegisterImpl::S, F13, F14 );
236 flush( L0, L1 );
237 flush( L2, -1 );
239 flushw();
241 illtrap( (1 << 22) - 2);
243 impdep1( 17, (1 << 19) - 1 );
244 impdep2( 3, 0 );
246 jmpl( L3, L4, L5 );
247 delayed()->nop();
248 jmpl( L6, -1, L7, Relocation::spec_simple(relocInfo::none));
249 delayed()->nop();
252 ldf( FloatRegisterImpl::S, O0, O1, F15 );
253 ldf( FloatRegisterImpl::D, O2, -1, F14 );
256 ldfsr( O3, O4 );
257 ldfsr( O5, -1 );
258 ldxfsr( O6, O7 );
259 ldxfsr( I0, -1 );
261 ldfa( FloatRegisterImpl::D, I1, I2, 1, F16 );
262 ldfa( FloatRegisterImpl::Q, I3, -1, F36 );
264 ldsb( I4, I5, I6 );
265 ldsb( I7, -1, G0 );
266 ldsh( G1, G3, G4 );
267 ldsh( G5, -1, G6 );
268 ldsw( G7, L0, L1 );
269 ldsw( L2, -1, L3 );
270 ldub( L4, L5, L6 );
271 ldub( L7, -1, O0 );
272 lduh( O1, O2, O3 );
273 lduh( O4, -1, O5 );
274 lduw( O6, O7, G0 );
275 lduw( G1, -1, G2 );
276 ldx( G3, G4, G5 );
277 ldx( G6, -1, G7 );
278 ldd( I0, I1, I2 );
279 ldd( I3, -1, I4 );
281 ldsba( I5, I6, 2, I7 );
282 ldsba( L0, -1, L1 );
283 ldsha( L2, L3, 3, L4 );
284 ldsha( L5, -1, L6 );
285 ldswa( L7, O0, (1 << 8) - 1, O1 );
286 ldswa( O2, -1, O3 );
287 lduba( O4, O5, 0, O6 );
288 lduba( O7, -1, I0 );
289 lduha( I1, I2, 1, I3 );
290 lduha( I4, -1, I5 );
291 lduwa( I6, I7, 2, L0 );
292 lduwa( L1, -1, L2 );
293 ldxa( L3, L4, 3, L5 );
294 ldxa( L6, -1, L7 );
295 ldda( G0, G1, 4, G2 );
296 ldda( G3, -1, G4 );
298 ldstub( G5, G6, G7 );
299 ldstub( O0, -1, O1 );
301 ldstuba( O2, O3, 5, O4 );
302 ldstuba( O5, -1, O6 );
304 and3( I0, L0, O0 );
305 and3( G7, -1, O7 );
306 andcc( L2, I2, G2 );
307 andcc( L4, -1, G4 );
308 andn( I5, I6, I7 );
309 andn( I6, -1, I7 );
310 andncc( I5, I6, I7 );
311 andncc( I7, -1, I6 );
312 or3( I5, I6, I7 );
313 or3( I7, -1, I6 );
314 orcc( I5, I6, I7 );
315 orcc( I7, -1, I6 );
316 orn( I5, I6, I7 );
317 orn( I7, -1, I6 );
318 orncc( I5, I6, I7 );
319 orncc( I7, -1, I6 );
320 xor3( I5, I6, I7 );
321 xor3( I7, -1, I6 );
322 xorcc( I5, I6, I7 );
323 xorcc( I7, -1, I6 );
324 xnor( I5, I6, I7 );
325 xnor( I7, -1, I6 );
326 xnorcc( I5, I6, I7 );
327 xnorcc( I7, -1, I6 );
329 membar( Membar_mask_bits(StoreStore | LoadStore | StoreLoad | LoadLoad | Sync | MemIssue | Lookaside ) );
330 membar( StoreStore );
331 membar( LoadStore );
332 membar( StoreLoad );
333 membar( LoadLoad );
334 membar( Sync );
335 membar( MemIssue );
336 membar( Lookaside );
338 fmov( FloatRegisterImpl::S, f_ordered, true, fcc2, F16, F17 );
339 fmov( FloatRegisterImpl::D, rc_lz, L5, F18, F20 );
341 movcc( overflowClear, false, icc, I6, L4 );
342 movcc( f_unorderedOrEqual, true, fcc2, (1 << 10) - 1, O0 );
344 movr( rc_nz, I5, I6, I7 );
345 movr( rc_gz, L1, -1, L2 );
347 mulx( I5, I6, I7 );
348 mulx( I7, -1, I6 );
349 sdivx( I5, I6, I7 );
350 sdivx( I7, -1, I6 );
351 udivx( I5, I6, I7 );
352 udivx( I7, -1, I6 );
354 umul( I5, I6, I7 );
355 umul( I7, -1, I6 );
356 smul( I5, I6, I7 );
357 smul( I7, -1, I6 );
358 umulcc( I5, I6, I7 );
359 umulcc( I7, -1, I6 );
360 smulcc( I5, I6, I7 );
361 smulcc( I7, -1, I6 );
363 mulscc( I5, I6, I7 );
364 mulscc( I7, -1, I6 );
366 nop();
369 popc( G0, G1);
370 popc( -1, G2);
372 prefetch( L1, L2, severalReads );
373 prefetch( L3, -1, oneRead );
374 prefetcha( O3, O2, 6, severalWritesAndPossiblyReads );
375 prefetcha( G2, -1, oneWrite );
377 rett( I7, I7);
378 delayed()->nop();
379 rett( G0, -1, relocInfo::none);
380 delayed()->nop();
382 save( I5, I6, I7 );
383 save( I7, -1, I6 );
384 restore( I5, I6, I7 );
385 restore( I7, -1, I6 );
387 saved();
388 restored();
390 sethi( 0xaaaaaaaa, I3, Relocation::spec_simple(relocInfo::none));
392 sll( I5, I6, I7 );
393 sll( I7, 31, I6 );
394 srl( I5, I6, I7 );
395 srl( I7, 0, I6 );
396 sra( I5, I6, I7 );
397 sra( I7, 30, I6 );
398 sllx( I5, I6, I7 );
399 sllx( I7, 63, I6 );
400 srlx( I5, I6, I7 );
401 srlx( I7, 0, I6 );
402 srax( I5, I6, I7 );
403 srax( I7, 62, I6 );
405 sir( -1 );
407 stbar();
409 stf( FloatRegisterImpl::Q, F40, G0, I7 );
410 stf( FloatRegisterImpl::S, F18, I3, -1 );
412 stfsr( L1, L2 );
413 stfsr( I7, -1 );
414 stxfsr( I6, I5 );
415 stxfsr( L4, -1 );
417 stfa( FloatRegisterImpl::D, F22, I6, I7, 7 );
418 stfa( FloatRegisterImpl::Q, F44, G0, -1 );
420 stb( L5, O2, I7 );
421 stb( I7, I6, -1 );
422 sth( L5, O2, I7 );
423 sth( I7, I6, -1 );
424 stw( L5, O2, I7 );
425 stw( I7, I6, -1 );
426 stx( L5, O2, I7 );
427 stx( I7, I6, -1 );
428 std( L5, O2, I7 );
429 std( I7, I6, -1 );
431 stba( L5, O2, I7, 8 );
432 stba( I7, I6, -1 );
433 stha( L5, O2, I7, 9 );
434 stha( I7, I6, -1 );
435 stwa( L5, O2, I7, 0 );
436 stwa( I7, I6, -1 );
437 stxa( L5, O2, I7, 11 );
438 stxa( I7, I6, -1 );
439 stda( L5, O2, I7, 12 );
440 stda( I7, I6, -1 );
442 sub( I5, I6, I7 );
443 sub( I7, -1, I6 );
444 subcc( I5, I6, I7 );
445 subcc( I7, -1, I6 );
446 subc( I5, I6, I7 );
447 subc( I7, -1, I6 );
448 subccc( I5, I6, I7 );
449 subccc( I7, -1, I6 );
451 swap( I5, I6, I7 );
452 swap( I7, -1, I6 );
454 swapa( G0, G1, 13, G2 );
455 swapa( I7, -1, I6 );
457 taddcc( I5, I6, I7 );
458 taddcc( I7, -1, I6 );
459 taddcctv( I5, I6, I7 );
460 taddcctv( I7, -1, I6 );
462 tsubcc( I5, I6, I7 );
463 tsubcc( I7, -1, I6 );
464 tsubcctv( I5, I6, I7 );
465 tsubcctv( I7, -1, I6 );
467 trap( overflowClear, xcc, G0, G1 );
468 trap( lessEqual, icc, I7, 17 );
470 bind(lbl2);
471 bind(lbl3);
473 code()->decode();
474 }
476 // Generate a bunch 'o stuff unique to V8
477 void Assembler::test_v8_onlys() {
478 Label lbl1;
480 cb( cp_0or1or2, false, pc() - 4, relocInfo::none);
481 delayed()->nop();
482 cb( cp_never, true, lbl1);
483 delayed()->nop();
485 cpop1(1, 2, 3, 4);
486 cpop2(5, 6, 7, 8);
488 ldc( I0, I1, 31);
489 ldc( I2, -1, 0);
491 lddc( I4, I4, 30);
492 lddc( I6, 0, 1 );
494 ldcsr( L0, L1, 0);
495 ldcsr( L1, (1 << 12) - 1, 17 );
497 stc( 31, L4, L5);
498 stc( 30, L6, -(1 << 12) );
500 stdc( 0, L7, G0);
501 stdc( 1, G1, 0 );
503 stcsr( 16, G2, G3);
504 stcsr( 17, G4, 1 );
506 stdcq( 4, G5, G6);
507 stdcq( 5, G7, -1 );
509 bind(lbl1);
511 code()->decode();
512 }
513 #endif
515 // Implementation of MacroAssembler
517 void MacroAssembler::null_check(Register reg, int offset) {
518 if (needs_explicit_null_check((intptr_t)offset)) {
519 // provoke OS NULL exception if reg = NULL by
520 // accessing M[reg] w/o changing any registers
521 ld_ptr(reg, 0, G0);
522 }
523 else {
524 // nothing to do, (later) access of M[reg + offset]
525 // will provoke OS NULL exception if reg = NULL
526 }
527 }
529 // Ring buffer jumps
531 #ifndef PRODUCT
532 void MacroAssembler::ret( bool trace ) { if (trace) {
533 mov(I7, O7); // traceable register
534 JMP(O7, 2 * BytesPerInstWord);
535 } else {
536 jmpl( I7, 2 * BytesPerInstWord, G0 );
537 }
538 }
540 void MacroAssembler::retl( bool trace ) { if (trace) JMP(O7, 2 * BytesPerInstWord);
541 else jmpl( O7, 2 * BytesPerInstWord, G0 ); }
542 #endif /* PRODUCT */
545 void MacroAssembler::jmp2(Register r1, Register r2, const char* file, int line ) {
546 assert_not_delayed();
547 // This can only be traceable if r1 & r2 are visible after a window save
548 if (TraceJumps) {
549 #ifndef PRODUCT
550 save_frame(0);
551 verify_thread();
552 ld(G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()), O0);
553 add(G2_thread, in_bytes(JavaThread::jmp_ring_offset()), O1);
554 sll(O0, exact_log2(4*sizeof(intptr_t)), O2);
555 add(O2, O1, O1);
557 add(r1->after_save(), r2->after_save(), O2);
558 set((intptr_t)file, O3);
559 set(line, O4);
560 Label L;
561 // get nearby pc, store jmp target
562 call(L, relocInfo::none); // No relocation for call to pc+0x8
563 delayed()->st(O2, O1, 0);
564 bind(L);
566 // store nearby pc
567 st(O7, O1, sizeof(intptr_t));
568 // store file
569 st(O3, O1, 2*sizeof(intptr_t));
570 // store line
571 st(O4, O1, 3*sizeof(intptr_t));
572 add(O0, 1, O0);
573 and3(O0, JavaThread::jump_ring_buffer_size - 1, O0);
574 st(O0, G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()));
575 restore();
576 #endif /* PRODUCT */
577 }
578 jmpl(r1, r2, G0);
579 }
580 void MacroAssembler::jmp(Register r1, int offset, const char* file, int line ) {
581 assert_not_delayed();
582 // This can only be traceable if r1 is visible after a window save
583 if (TraceJumps) {
584 #ifndef PRODUCT
585 save_frame(0);
586 verify_thread();
587 ld(G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()), O0);
588 add(G2_thread, in_bytes(JavaThread::jmp_ring_offset()), O1);
589 sll(O0, exact_log2(4*sizeof(intptr_t)), O2);
590 add(O2, O1, O1);
592 add(r1->after_save(), offset, O2);
593 set((intptr_t)file, O3);
594 set(line, O4);
595 Label L;
596 // get nearby pc, store jmp target
597 call(L, relocInfo::none); // No relocation for call to pc+0x8
598 delayed()->st(O2, O1, 0);
599 bind(L);
601 // store nearby pc
602 st(O7, O1, sizeof(intptr_t));
603 // store file
604 st(O3, O1, 2*sizeof(intptr_t));
605 // store line
606 st(O4, O1, 3*sizeof(intptr_t));
607 add(O0, 1, O0);
608 and3(O0, JavaThread::jump_ring_buffer_size - 1, O0);
609 st(O0, G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()));
610 restore();
611 #endif /* PRODUCT */
612 }
613 jmp(r1, offset);
614 }
616 // This code sequence is relocatable to any address, even on LP64.
617 void MacroAssembler::jumpl( Address& a, Register d, int offset, const char* file, int line ) {
618 assert_not_delayed();
619 // Force fixed length sethi because NativeJump and NativeFarCall don't handle
620 // variable length instruction streams.
621 sethi(a, /*ForceRelocatable=*/ true);
622 if (TraceJumps) {
623 #ifndef PRODUCT
624 // Must do the add here so relocation can find the remainder of the
625 // value to be relocated.
626 add(a.base(), a.disp() + offset, a.base(), a.rspec(offset));
627 save_frame(0);
628 verify_thread();
629 ld(G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()), O0);
630 add(G2_thread, in_bytes(JavaThread::jmp_ring_offset()), O1);
631 sll(O0, exact_log2(4*sizeof(intptr_t)), O2);
632 add(O2, O1, O1);
634 set((intptr_t)file, O3);
635 set(line, O4);
636 Label L;
638 // get nearby pc, store jmp target
639 call(L, relocInfo::none); // No relocation for call to pc+0x8
640 delayed()->st(a.base()->after_save(), O1, 0);
641 bind(L);
643 // store nearby pc
644 st(O7, O1, sizeof(intptr_t));
645 // store file
646 st(O3, O1, 2*sizeof(intptr_t));
647 // store line
648 st(O4, O1, 3*sizeof(intptr_t));
649 add(O0, 1, O0);
650 and3(O0, JavaThread::jump_ring_buffer_size - 1, O0);
651 st(O0, G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()));
652 restore();
653 jmpl(a.base(), G0, d);
654 #else
655 jmpl(a, d, offset);
656 #endif /* PRODUCT */
657 } else {
658 jmpl(a, d, offset);
659 }
660 }
662 void MacroAssembler::jump( Address& a, int offset, const char* file, int line ) {
663 jumpl( a, G0, offset, file, line );
664 }
667 // Convert to C varargs format
668 void MacroAssembler::set_varargs( Argument inArg, Register d ) {
669 // spill register-resident args to their memory slots
670 // (SPARC calling convention requires callers to have already preallocated these)
671 // Note that the inArg might in fact be an outgoing argument,
672 // if a leaf routine or stub does some tricky argument shuffling.
673 // This routine must work even though one of the saved arguments
674 // is in the d register (e.g., set_varargs(Argument(0, false), O0)).
675 for (Argument savePtr = inArg;
676 savePtr.is_register();
677 savePtr = savePtr.successor()) {
678 st_ptr(savePtr.as_register(), savePtr.address_in_frame());
679 }
680 // return the address of the first memory slot
681 add(inArg.address_in_frame(), d);
682 }
684 // Conditional breakpoint (for assertion checks in assembly code)
685 void MacroAssembler::breakpoint_trap(Condition c, CC cc) {
686 trap(c, cc, G0, ST_RESERVED_FOR_USER_0);
687 }
689 // We want to use ST_BREAKPOINT here, but the debugger is confused by it.
690 void MacroAssembler::breakpoint_trap() {
691 trap(ST_RESERVED_FOR_USER_0);
692 }
694 // flush windows (except current) using flushw instruction if avail.
695 void MacroAssembler::flush_windows() {
696 if (VM_Version::v9_instructions_work()) flushw();
697 else flush_windows_trap();
698 }
700 // Write serialization page so VM thread can do a pseudo remote membar
701 // We use the current thread pointer to calculate a thread specific
702 // offset to write to within the page. This minimizes bus traffic
703 // due to cache line collision.
704 void MacroAssembler::serialize_memory(Register thread, Register tmp1, Register tmp2) {
705 Address mem_serialize_page(tmp1, os::get_memory_serialize_page());
706 srl(thread, os::get_serialize_page_shift_count(), tmp2);
707 if (Assembler::is_simm13(os::vm_page_size())) {
708 and3(tmp2, (os::vm_page_size() - sizeof(int)), tmp2);
709 }
710 else {
711 set((os::vm_page_size() - sizeof(int)), tmp1);
712 and3(tmp2, tmp1, tmp2);
713 }
714 load_address(mem_serialize_page);
715 st(G0, tmp1, tmp2);
716 }
720 void MacroAssembler::enter() {
721 Unimplemented();
722 }
724 void MacroAssembler::leave() {
725 Unimplemented();
726 }
728 void MacroAssembler::mult(Register s1, Register s2, Register d) {
729 if(VM_Version::v9_instructions_work()) {
730 mulx (s1, s2, d);
731 } else {
732 smul (s1, s2, d);
733 }
734 }
736 void MacroAssembler::mult(Register s1, int simm13a, Register d) {
737 if(VM_Version::v9_instructions_work()) {
738 mulx (s1, simm13a, d);
739 } else {
740 smul (s1, simm13a, d);
741 }
742 }
745 #ifdef ASSERT
746 void MacroAssembler::read_ccr_v8_assert(Register ccr_save) {
747 const Register s1 = G3_scratch;
748 const Register s2 = G4_scratch;
749 Label get_psr_test;
750 // Get the condition codes the V8 way.
751 read_ccr_trap(s1);
752 mov(ccr_save, s2);
753 // This is a test of V8 which has icc but not xcc
754 // so mask off the xcc bits
755 and3(s2, 0xf, s2);
756 // Compare condition codes from the V8 and V9 ways.
757 subcc(s2, s1, G0);
758 br(Assembler::notEqual, true, Assembler::pt, get_psr_test);
759 delayed()->breakpoint_trap();
760 bind(get_psr_test);
761 }
763 void MacroAssembler::write_ccr_v8_assert(Register ccr_save) {
764 const Register s1 = G3_scratch;
765 const Register s2 = G4_scratch;
766 Label set_psr_test;
767 // Write out the saved condition codes the V8 way
768 write_ccr_trap(ccr_save, s1, s2);
769 // Read back the condition codes using the V9 instruction
770 rdccr(s1);
771 mov(ccr_save, s2);
772 // This is a test of V8 which has icc but not xcc
773 // so mask off the xcc bits
774 and3(s2, 0xf, s2);
775 and3(s1, 0xf, s1);
776 // Compare the V8 way with the V9 way.
777 subcc(s2, s1, G0);
778 br(Assembler::notEqual, true, Assembler::pt, set_psr_test);
779 delayed()->breakpoint_trap();
780 bind(set_psr_test);
781 }
782 #else
783 #define read_ccr_v8_assert(x)
784 #define write_ccr_v8_assert(x)
785 #endif // ASSERT
787 void MacroAssembler::read_ccr(Register ccr_save) {
788 if (VM_Version::v9_instructions_work()) {
789 rdccr(ccr_save);
790 // Test code sequence used on V8. Do not move above rdccr.
791 read_ccr_v8_assert(ccr_save);
792 } else {
793 read_ccr_trap(ccr_save);
794 }
795 }
797 void MacroAssembler::write_ccr(Register ccr_save) {
798 if (VM_Version::v9_instructions_work()) {
799 // Test code sequence used on V8. Do not move below wrccr.
800 write_ccr_v8_assert(ccr_save);
801 wrccr(ccr_save);
802 } else {
803 const Register temp_reg1 = G3_scratch;
804 const Register temp_reg2 = G4_scratch;
805 write_ccr_trap(ccr_save, temp_reg1, temp_reg2);
806 }
807 }
810 // Calls to C land
812 #ifdef ASSERT
813 // a hook for debugging
814 static Thread* reinitialize_thread() {
815 return ThreadLocalStorage::thread();
816 }
817 #else
818 #define reinitialize_thread ThreadLocalStorage::thread
819 #endif
821 #ifdef ASSERT
822 address last_get_thread = NULL;
823 #endif
825 // call this when G2_thread is not known to be valid
826 void MacroAssembler::get_thread() {
827 save_frame(0); // to avoid clobbering O0
828 mov(G1, L0); // avoid clobbering G1
829 mov(G5_method, L1); // avoid clobbering G5
830 mov(G3, L2); // avoid clobbering G3 also
831 mov(G4, L5); // avoid clobbering G4
832 #ifdef ASSERT
833 Address last_get_thread_addr(L3, (address)&last_get_thread);
834 sethi(last_get_thread_addr);
835 inc(L4, get_pc(L4) + 2 * BytesPerInstWord); // skip getpc() code + inc + st_ptr to point L4 at call
836 st_ptr(L4, last_get_thread_addr);
837 #endif
838 call(CAST_FROM_FN_PTR(address, reinitialize_thread), relocInfo::runtime_call_type);
839 delayed()->nop();
840 mov(L0, G1);
841 mov(L1, G5_method);
842 mov(L2, G3);
843 mov(L5, G4);
844 restore(O0, 0, G2_thread);
845 }
847 static Thread* verify_thread_subroutine(Thread* gthread_value) {
848 Thread* correct_value = ThreadLocalStorage::thread();
849 guarantee(gthread_value == correct_value, "G2_thread value must be the thread");
850 return correct_value;
851 }
853 void MacroAssembler::verify_thread() {
854 if (VerifyThread) {
855 // NOTE: this chops off the heads of the 64-bit O registers.
856 #ifdef CC_INTERP
857 save_frame(0);
858 #else
859 // make sure G2_thread contains the right value
860 save_frame_and_mov(0, Lmethod, Lmethod); // to avoid clobbering O0 (and propagate Lmethod for -Xprof)
861 mov(G1, L1); // avoid clobbering G1
862 // G2 saved below
863 mov(G3, L3); // avoid clobbering G3
864 mov(G4, L4); // avoid clobbering G4
865 mov(G5_method, L5); // avoid clobbering G5_method
866 #endif /* CC_INTERP */
867 #if defined(COMPILER2) && !defined(_LP64)
868 // Save & restore possible 64-bit Long arguments in G-regs
869 srlx(G1,32,L0);
870 srlx(G4,32,L6);
871 #endif
872 call(CAST_FROM_FN_PTR(address,verify_thread_subroutine), relocInfo::runtime_call_type);
873 delayed()->mov(G2_thread, O0);
875 mov(L1, G1); // Restore G1
876 // G2 restored below
877 mov(L3, G3); // restore G3
878 mov(L4, G4); // restore G4
879 mov(L5, G5_method); // restore G5_method
880 #if defined(COMPILER2) && !defined(_LP64)
881 // Save & restore possible 64-bit Long arguments in G-regs
882 sllx(L0,32,G2); // Move old high G1 bits high in G2
883 sllx(G1, 0,G1); // Clear current high G1 bits
884 or3 (G1,G2,G1); // Recover 64-bit G1
885 sllx(L6,32,G2); // Move old high G4 bits high in G2
886 sllx(G4, 0,G4); // Clear current high G4 bits
887 or3 (G4,G2,G4); // Recover 64-bit G4
888 #endif
889 restore(O0, 0, G2_thread);
890 }
891 }
894 void MacroAssembler::save_thread(const Register thread_cache) {
895 verify_thread();
896 if (thread_cache->is_valid()) {
897 assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
898 mov(G2_thread, thread_cache);
899 }
900 if (VerifyThread) {
901 // smash G2_thread, as if the VM were about to anyway
902 set(0x67676767, G2_thread);
903 }
904 }
907 void MacroAssembler::restore_thread(const Register thread_cache) {
908 if (thread_cache->is_valid()) {
909 assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
910 mov(thread_cache, G2_thread);
911 verify_thread();
912 } else {
913 // do it the slow way
914 get_thread();
915 }
916 }
919 // %%% maybe get rid of [re]set_last_Java_frame
920 void MacroAssembler::set_last_Java_frame(Register last_java_sp, Register last_Java_pc) {
921 assert_not_delayed();
922 Address flags(G2_thread,
923 0,
924 in_bytes(JavaThread::frame_anchor_offset()) +
925 in_bytes(JavaFrameAnchor::flags_offset()));
926 Address pc_addr(G2_thread,
927 0,
928 in_bytes(JavaThread::last_Java_pc_offset()));
930 // Always set last_Java_pc and flags first because once last_Java_sp is visible
931 // has_last_Java_frame is true and users will look at the rest of the fields.
932 // (Note: flags should always be zero before we get here so doesn't need to be set.)
934 #ifdef ASSERT
935 // Verify that flags was zeroed on return to Java
936 Label PcOk;
937 save_frame(0); // to avoid clobbering O0
938 ld_ptr(pc_addr, L0);
939 tst(L0);
940 #ifdef _LP64
941 brx(Assembler::zero, false, Assembler::pt, PcOk);
942 #else
943 br(Assembler::zero, false, Assembler::pt, PcOk);
944 #endif // _LP64
945 delayed() -> nop();
946 stop("last_Java_pc not zeroed before leaving Java");
947 bind(PcOk);
949 // Verify that flags was zeroed on return to Java
950 Label FlagsOk;
951 ld(flags, L0);
952 tst(L0);
953 br(Assembler::zero, false, Assembler::pt, FlagsOk);
954 delayed() -> restore();
955 stop("flags not zeroed before leaving Java");
956 bind(FlagsOk);
957 #endif /* ASSERT */
958 //
959 // When returning from calling out from Java mode the frame anchor's last_Java_pc
960 // will always be set to NULL. It is set here so that if we are doing a call to
961 // native (not VM) that we capture the known pc and don't have to rely on the
962 // native call having a standard frame linkage where we can find the pc.
964 if (last_Java_pc->is_valid()) {
965 st_ptr(last_Java_pc, pc_addr);
966 }
968 #ifdef _LP64
969 #ifdef ASSERT
970 // Make sure that we have an odd stack
971 Label StackOk;
972 andcc(last_java_sp, 0x01, G0);
973 br(Assembler::notZero, false, Assembler::pt, StackOk);
974 delayed() -> nop();
975 stop("Stack Not Biased in set_last_Java_frame");
976 bind(StackOk);
977 #endif // ASSERT
978 assert( last_java_sp != G4_scratch, "bad register usage in set_last_Java_frame");
979 add( last_java_sp, STACK_BIAS, G4_scratch );
980 st_ptr(G4_scratch, Address(G2_thread, 0, in_bytes(JavaThread::last_Java_sp_offset())));
981 #else
982 st_ptr(last_java_sp, Address(G2_thread, 0, in_bytes(JavaThread::last_Java_sp_offset())));
983 #endif // _LP64
984 }
986 void MacroAssembler::reset_last_Java_frame(void) {
987 assert_not_delayed();
989 Address sp_addr(G2_thread, 0, in_bytes(JavaThread::last_Java_sp_offset()));
990 Address pc_addr(G2_thread,
991 0,
992 in_bytes(JavaThread::frame_anchor_offset()) + in_bytes(JavaFrameAnchor::last_Java_pc_offset()));
993 Address flags(G2_thread,
994 0,
995 in_bytes(JavaThread::frame_anchor_offset()) + in_bytes(JavaFrameAnchor::flags_offset()));
997 #ifdef ASSERT
998 // check that it WAS previously set
999 #ifdef CC_INTERP
1000 save_frame(0);
1001 #else
1002 save_frame_and_mov(0, Lmethod, Lmethod); // Propagate Lmethod to helper frame for -Xprof
1003 #endif /* CC_INTERP */
1004 ld_ptr(sp_addr, L0);
1005 tst(L0);
1006 breakpoint_trap(Assembler::zero, Assembler::ptr_cc);
1007 restore();
1008 #endif // ASSERT
1010 st_ptr(G0, sp_addr);
1011 // Always return last_Java_pc to zero
1012 st_ptr(G0, pc_addr);
1013 // Always null flags after return to Java
1014 st(G0, flags);
1015 }
1018 void MacroAssembler::call_VM_base(
1019 Register oop_result,
1020 Register thread_cache,
1021 Register last_java_sp,
1022 address entry_point,
1023 int number_of_arguments,
1024 bool check_exceptions)
1025 {
1026 assert_not_delayed();
1028 // determine last_java_sp register
1029 if (!last_java_sp->is_valid()) {
1030 last_java_sp = SP;
1031 }
1032 // debugging support
1033 assert(number_of_arguments >= 0 , "cannot have negative number of arguments");
1035 // 64-bit last_java_sp is biased!
1036 set_last_Java_frame(last_java_sp, noreg);
1037 if (VerifyThread) mov(G2_thread, O0); // about to be smashed; pass early
1038 save_thread(thread_cache);
1039 // do the call
1040 call(entry_point, relocInfo::runtime_call_type);
1041 if (!VerifyThread)
1042 delayed()->mov(G2_thread, O0); // pass thread as first argument
1043 else
1044 delayed()->nop(); // (thread already passed)
1045 restore_thread(thread_cache);
1046 reset_last_Java_frame();
1048 // check for pending exceptions. use Gtemp as scratch register.
1049 if (check_exceptions) {
1050 check_and_forward_exception(Gtemp);
1051 }
1053 // get oop result if there is one and reset the value in the thread
1054 if (oop_result->is_valid()) {
1055 get_vm_result(oop_result);
1056 }
1057 }
1059 void MacroAssembler::check_and_forward_exception(Register scratch_reg)
1060 {
1061 Label L;
1063 check_and_handle_popframe(scratch_reg);
1064 check_and_handle_earlyret(scratch_reg);
1066 Address exception_addr(G2_thread, 0, in_bytes(Thread::pending_exception_offset()));
1067 ld_ptr(exception_addr, scratch_reg);
1068 br_null(scratch_reg,false,pt,L);
1069 delayed()->nop();
1070 // we use O7 linkage so that forward_exception_entry has the issuing PC
1071 call(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);
1072 delayed()->nop();
1073 bind(L);
1074 }
1077 void MacroAssembler::check_and_handle_popframe(Register scratch_reg) {
1078 }
1081 void MacroAssembler::check_and_handle_earlyret(Register scratch_reg) {
1082 }
1085 void MacroAssembler::call_VM(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) {
1086 call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions);
1087 }
1090 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions) {
1091 // O0 is reserved for the thread
1092 mov(arg_1, O1);
1093 call_VM(oop_result, entry_point, 1, check_exceptions);
1094 }
1097 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
1098 // O0 is reserved for the thread
1099 mov(arg_1, O1);
1100 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
1101 call_VM(oop_result, entry_point, 2, check_exceptions);
1102 }
1105 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions) {
1106 // O0 is reserved for the thread
1107 mov(arg_1, O1);
1108 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
1109 mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
1110 call_VM(oop_result, entry_point, 3, check_exceptions);
1111 }
1115 // Note: The following call_VM overloadings are useful when a "save"
1116 // has already been performed by a stub, and the last Java frame is
1117 // the previous one. In that case, last_java_sp must be passed as FP
1118 // instead of SP.
1121 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, int number_of_arguments, bool check_exceptions) {
1122 call_VM_base(oop_result, noreg, last_java_sp, entry_point, number_of_arguments, check_exceptions);
1123 }
1126 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions) {
1127 // O0 is reserved for the thread
1128 mov(arg_1, O1);
1129 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions);
1130 }
1133 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
1134 // O0 is reserved for the thread
1135 mov(arg_1, O1);
1136 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
1137 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions);
1138 }
1141 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) {
1142 // O0 is reserved for the thread
1143 mov(arg_1, O1);
1144 mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
1145 mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
1146 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions);
1147 }
1151 void MacroAssembler::call_VM_leaf_base(Register thread_cache, address entry_point, int number_of_arguments) {
1152 assert_not_delayed();
1153 save_thread(thread_cache);
1154 // do the call
1155 call(entry_point, relocInfo::runtime_call_type);
1156 delayed()->nop();
1157 restore_thread(thread_cache);
1158 }
1161 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, int number_of_arguments) {
1162 call_VM_leaf_base(thread_cache, entry_point, number_of_arguments);
1163 }
1166 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1) {
1167 mov(arg_1, O0);
1168 call_VM_leaf(thread_cache, entry_point, 1);
1169 }
1172 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2) {
1173 mov(arg_1, O0);
1174 mov(arg_2, O1); assert(arg_2 != O0, "smashed argument");
1175 call_VM_leaf(thread_cache, entry_point, 2);
1176 }
1179 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2, Register arg_3) {
1180 mov(arg_1, O0);
1181 mov(arg_2, O1); assert(arg_2 != O0, "smashed argument");
1182 mov(arg_3, O2); assert(arg_3 != O0 && arg_3 != O1, "smashed argument");
1183 call_VM_leaf(thread_cache, entry_point, 3);
1184 }
1187 void MacroAssembler::get_vm_result(Register oop_result) {
1188 verify_thread();
1189 Address vm_result_addr(G2_thread, 0, in_bytes(JavaThread::vm_result_offset()));
1190 ld_ptr( vm_result_addr, oop_result);
1191 st_ptr(G0, vm_result_addr);
1192 verify_oop(oop_result);
1193 }
1196 void MacroAssembler::get_vm_result_2(Register oop_result) {
1197 verify_thread();
1198 Address vm_result_addr_2(G2_thread, 0, in_bytes(JavaThread::vm_result_2_offset()));
1199 ld_ptr(vm_result_addr_2, oop_result);
1200 st_ptr(G0, vm_result_addr_2);
1201 verify_oop(oop_result);
1202 }
1205 // We require that C code which does not return a value in vm_result will
1206 // leave it undisturbed.
1207 void MacroAssembler::set_vm_result(Register oop_result) {
1208 verify_thread();
1209 Address vm_result_addr(G2_thread, 0, in_bytes(JavaThread::vm_result_offset()));
1210 verify_oop(oop_result);
1212 # ifdef ASSERT
1213 // Check that we are not overwriting any other oop.
1214 #ifdef CC_INTERP
1215 save_frame(0);
1216 #else
1217 save_frame_and_mov(0, Lmethod, Lmethod); // Propagate Lmethod for -Xprof
1218 #endif /* CC_INTERP */
1219 ld_ptr(vm_result_addr, L0);
1220 tst(L0);
1221 restore();
1222 breakpoint_trap(notZero, Assembler::ptr_cc);
1223 // }
1224 # endif
1226 st_ptr(oop_result, vm_result_addr);
1227 }
1230 void MacroAssembler::card_table_write(jbyte* byte_map_base,
1231 Register tmp, Register obj) {
1232 #ifdef _LP64
1233 srlx(obj, CardTableModRefBS::card_shift, obj);
1234 #else
1235 srl(obj, CardTableModRefBS::card_shift, obj);
1236 #endif
1237 assert( tmp != obj, "need separate temp reg");
1238 Address rs(tmp, (address)byte_map_base);
1239 load_address(rs);
1240 stb(G0, rs.base(), obj);
1241 }
1243 // %%% Note: The following six instructions have been moved,
1244 // unchanged, from assembler_sparc.inline.hpp.
1245 // They will be refactored at a later date.
1247 void MacroAssembler::sethi(intptr_t imm22a,
1248 Register d,
1249 bool ForceRelocatable,
1250 RelocationHolder const& rspec) {
1251 Address adr( d, (address)imm22a, rspec );
1252 MacroAssembler::sethi( adr, ForceRelocatable );
1253 }
1256 void MacroAssembler::sethi(Address& a, bool ForceRelocatable) {
1257 address save_pc;
1258 int shiftcnt;
1259 // if addr of local, do not need to load it
1260 assert(a.base() != FP && a.base() != SP, "just use ld or st for locals");
1261 #ifdef _LP64
1262 # ifdef CHECK_DELAY
1263 assert_not_delayed( (char *)"cannot put two instructions in delay slot" );
1264 # endif
1265 v9_dep();
1266 // ForceRelocatable = 1;
1267 save_pc = pc();
1268 if (a.hi32() == 0 && a.low32() >= 0) {
1269 Assembler::sethi(a.low32(), a.base(), a.rspec());
1270 }
1271 else if (a.hi32() == -1) {
1272 Assembler::sethi(~a.low32(), a.base(), a.rspec());
1273 xor3(a.base(), ~low10(~0), a.base());
1274 }
1275 else {
1276 Assembler::sethi(a.hi32(), a.base(), a.rspec() ); // 22
1277 if ( a.hi32() & 0x3ff ) // Any bits?
1278 or3( a.base(), a.hi32() & 0x3ff ,a.base() ); // High 32 bits are now in low 32
1279 if ( a.low32() & 0xFFFFFC00 ) { // done?
1280 if( (a.low32() >> 20) & 0xfff ) { // Any bits set?
1281 sllx(a.base(), 12, a.base()); // Make room for next 12 bits
1282 or3( a.base(), (a.low32() >> 20) & 0xfff,a.base() ); // Or in next 12
1283 shiftcnt = 0; // We already shifted
1284 }
1285 else
1286 shiftcnt = 12;
1287 if( (a.low32() >> 10) & 0x3ff ) {
1288 sllx(a.base(), shiftcnt+10, a.base());// Make room for last 10 bits
1289 or3( a.base(), (a.low32() >> 10) & 0x3ff,a.base() ); // Or in next 10
1290 shiftcnt = 0;
1291 }
1292 else
1293 shiftcnt = 10;
1294 sllx(a.base(), shiftcnt+10 , a.base()); // Shift leaving disp field 0'd
1295 }
1296 else
1297 sllx( a.base(), 32, a.base() );
1298 }
1299 // Pad out the instruction sequence so it can be
1300 // patched later.
1301 if ( ForceRelocatable || (a.rtype() != relocInfo::none &&
1302 a.rtype() != relocInfo::runtime_call_type) ) {
1303 while ( pc() < (save_pc + (7 * BytesPerInstWord )) )
1304 nop();
1305 }
1306 #else
1307 Assembler::sethi(a.hi(), a.base(), a.rspec());
1308 #endif
1310 }
1312 int MacroAssembler::size_of_sethi(address a, bool worst_case) {
1313 #ifdef _LP64
1314 if (worst_case) return 7;
1315 intptr_t iaddr = (intptr_t)a;
1316 int hi32 = (int)(iaddr >> 32);
1317 int lo32 = (int)(iaddr);
1318 int inst_count;
1319 if (hi32 == 0 && lo32 >= 0)
1320 inst_count = 1;
1321 else if (hi32 == -1)
1322 inst_count = 2;
1323 else {
1324 inst_count = 2;
1325 if ( hi32 & 0x3ff )
1326 inst_count++;
1327 if ( lo32 & 0xFFFFFC00 ) {
1328 if( (lo32 >> 20) & 0xfff ) inst_count += 2;
1329 if( (lo32 >> 10) & 0x3ff ) inst_count += 2;
1330 }
1331 }
1332 return BytesPerInstWord * inst_count;
1333 #else
1334 return BytesPerInstWord;
1335 #endif
1336 }
1338 int MacroAssembler::worst_case_size_of_set() {
1339 return size_of_sethi(NULL, true) + 1;
1340 }
1342 void MacroAssembler::set(intptr_t value, Register d,
1343 RelocationHolder const& rspec) {
1344 Address val( d, (address)value, rspec);
1346 if ( rspec.type() == relocInfo::none ) {
1347 // can optimize
1348 if (-4096 <= value && value <= 4095) {
1349 or3(G0, value, d); // setsw (this leaves upper 32 bits sign-extended)
1350 return;
1351 }
1352 if (inv_hi22(hi22(value)) == value) {
1353 sethi(val);
1354 return;
1355 }
1356 }
1357 assert_not_delayed( (char *)"cannot put two instructions in delay slot" );
1358 sethi( val );
1359 if (rspec.type() != relocInfo::none || (value & 0x3ff) != 0) {
1360 add( d, value & 0x3ff, d, rspec);
1361 }
1362 }
1364 void MacroAssembler::setsw(int value, Register d,
1365 RelocationHolder const& rspec) {
1366 Address val( d, (address)value, rspec);
1367 if ( rspec.type() == relocInfo::none ) {
1368 // can optimize
1369 if (-4096 <= value && value <= 4095) {
1370 or3(G0, value, d);
1371 return;
1372 }
1373 if (inv_hi22(hi22(value)) == value) {
1374 sethi( val );
1375 #ifndef _LP64
1376 if ( value < 0 ) {
1377 assert_not_delayed();
1378 sra (d, G0, d);
1379 }
1380 #endif
1381 return;
1382 }
1383 }
1384 assert_not_delayed();
1385 sethi( val );
1386 add( d, value & 0x3ff, d, rspec);
1388 // (A negative value could be loaded in 2 insns with sethi/xor,
1389 // but it would take a more complex relocation.)
1390 #ifndef _LP64
1391 if ( value < 0)
1392 sra(d, G0, d);
1393 #endif
1394 }
1396 // %%% End of moved six set instructions.
1399 void MacroAssembler::set64(jlong value, Register d, Register tmp) {
1400 assert_not_delayed();
1401 v9_dep();
1403 int hi = (int)(value >> 32);
1404 int lo = (int)(value & ~0);
1405 // (Matcher::isSimpleConstant64 knows about the following optimizations.)
1406 if (Assembler::is_simm13(lo) && value == lo) {
1407 or3(G0, lo, d);
1408 } else if (hi == 0) {
1409 Assembler::sethi(lo, d); // hardware version zero-extends to upper 32
1410 if (low10(lo) != 0)
1411 or3(d, low10(lo), d);
1412 }
1413 else if (hi == -1) {
1414 Assembler::sethi(~lo, d); // hardware version zero-extends to upper 32
1415 xor3(d, low10(lo) ^ ~low10(~0), d);
1416 }
1417 else if (lo == 0) {
1418 if (Assembler::is_simm13(hi)) {
1419 or3(G0, hi, d);
1420 } else {
1421 Assembler::sethi(hi, d); // hardware version zero-extends to upper 32
1422 if (low10(hi) != 0)
1423 or3(d, low10(hi), d);
1424 }
1425 sllx(d, 32, d);
1426 }
1427 else {
1428 Assembler::sethi(hi, tmp);
1429 Assembler::sethi(lo, d); // macro assembler version sign-extends
1430 if (low10(hi) != 0)
1431 or3 (tmp, low10(hi), tmp);
1432 if (low10(lo) != 0)
1433 or3 ( d, low10(lo), d);
1434 sllx(tmp, 32, tmp);
1435 or3 (d, tmp, d);
1436 }
1437 }
1439 // compute size in bytes of sparc frame, given
1440 // number of extraWords
1441 int MacroAssembler::total_frame_size_in_bytes(int extraWords) {
1443 int nWords = frame::memory_parameter_word_sp_offset;
1445 nWords += extraWords;
1447 if (nWords & 1) ++nWords; // round up to double-word
1449 return nWords * BytesPerWord;
1450 }
1453 // save_frame: given number of "extra" words in frame,
1454 // issue approp. save instruction (p 200, v8 manual)
1456 void MacroAssembler::save_frame(int extraWords = 0) {
1457 int delta = -total_frame_size_in_bytes(extraWords);
1458 if (is_simm13(delta)) {
1459 save(SP, delta, SP);
1460 } else {
1461 set(delta, G3_scratch);
1462 save(SP, G3_scratch, SP);
1463 }
1464 }
1467 void MacroAssembler::save_frame_c1(int size_in_bytes) {
1468 if (is_simm13(-size_in_bytes)) {
1469 save(SP, -size_in_bytes, SP);
1470 } else {
1471 set(-size_in_bytes, G3_scratch);
1472 save(SP, G3_scratch, SP);
1473 }
1474 }
1477 void MacroAssembler::save_frame_and_mov(int extraWords,
1478 Register s1, Register d1,
1479 Register s2, Register d2) {
1480 assert_not_delayed();
1482 // The trick here is to use precisely the same memory word
1483 // that trap handlers also use to save the register.
1484 // This word cannot be used for any other purpose, but
1485 // it works fine to save the register's value, whether or not
1486 // an interrupt flushes register windows at any given moment!
1487 Address s1_addr;
1488 if (s1->is_valid() && (s1->is_in() || s1->is_local())) {
1489 s1_addr = s1->address_in_saved_window();
1490 st_ptr(s1, s1_addr);
1491 }
1493 Address s2_addr;
1494 if (s2->is_valid() && (s2->is_in() || s2->is_local())) {
1495 s2_addr = s2->address_in_saved_window();
1496 st_ptr(s2, s2_addr);
1497 }
1499 save_frame(extraWords);
1501 if (s1_addr.base() == SP) {
1502 ld_ptr(s1_addr.after_save(), d1);
1503 } else if (s1->is_valid()) {
1504 mov(s1->after_save(), d1);
1505 }
1507 if (s2_addr.base() == SP) {
1508 ld_ptr(s2_addr.after_save(), d2);
1509 } else if (s2->is_valid()) {
1510 mov(s2->after_save(), d2);
1511 }
1512 }
1515 Address MacroAssembler::allocate_oop_address(jobject obj, Register d) {
1516 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1517 int oop_index = oop_recorder()->allocate_index(obj);
1518 return Address(d, address(obj), oop_Relocation::spec(oop_index));
1519 }
1522 Address MacroAssembler::constant_oop_address(jobject obj, Register d) {
1523 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1524 int oop_index = oop_recorder()->find_index(obj);
1525 return Address(d, address(obj), oop_Relocation::spec(oop_index));
1526 }
1528 void MacroAssembler::set_narrow_oop(jobject obj, Register d) {
1529 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1530 int oop_index = oop_recorder()->find_index(obj);
1531 RelocationHolder rspec = oop_Relocation::spec(oop_index);
1533 assert_not_delayed();
1534 // Relocation with special format (see relocInfo_sparc.hpp).
1535 relocate(rspec, 1);
1536 // Assembler::sethi(0x3fffff, d);
1537 emit_long( op(branch_op) | rd(d) | op2(sethi_op2) | hi22(0x3fffff) );
1538 // Don't add relocation for 'add'. Do patching during 'sethi' processing.
1539 add(d, 0x3ff, d);
1541 }
1544 void MacroAssembler::align(int modulus) {
1545 while (offset() % modulus != 0) nop();
1546 }
1549 void MacroAssembler::safepoint() {
1550 relocate(breakpoint_Relocation::spec(breakpoint_Relocation::safepoint));
1551 }
1554 void RegistersForDebugging::print(outputStream* s) {
1555 int j;
1556 for ( j = 0; j < 8; ++j )
1557 if ( j != 6 ) s->print_cr("i%d = 0x%.16lx", j, i[j]);
1558 else s->print_cr( "fp = 0x%.16lx", i[j]);
1559 s->cr();
1561 for ( j = 0; j < 8; ++j )
1562 s->print_cr("l%d = 0x%.16lx", j, l[j]);
1563 s->cr();
1565 for ( j = 0; j < 8; ++j )
1566 if ( j != 6 ) s->print_cr("o%d = 0x%.16lx", j, o[j]);
1567 else s->print_cr( "sp = 0x%.16lx", o[j]);
1568 s->cr();
1570 for ( j = 0; j < 8; ++j )
1571 s->print_cr("g%d = 0x%.16lx", j, g[j]);
1572 s->cr();
1574 // print out floats with compression
1575 for (j = 0; j < 32; ) {
1576 jfloat val = f[j];
1577 int last = j;
1578 for ( ; last+1 < 32; ++last ) {
1579 char b1[1024], b2[1024];
1580 sprintf(b1, "%f", val);
1581 sprintf(b2, "%f", f[last+1]);
1582 if (strcmp(b1, b2))
1583 break;
1584 }
1585 s->print("f%d", j);
1586 if ( j != last ) s->print(" - f%d", last);
1587 s->print(" = %f", val);
1588 s->fill_to(25);
1589 s->print_cr(" (0x%x)", val);
1590 j = last + 1;
1591 }
1592 s->cr();
1594 // and doubles (evens only)
1595 for (j = 0; j < 32; ) {
1596 jdouble val = d[j];
1597 int last = j;
1598 for ( ; last+1 < 32; ++last ) {
1599 char b1[1024], b2[1024];
1600 sprintf(b1, "%f", val);
1601 sprintf(b2, "%f", d[last+1]);
1602 if (strcmp(b1, b2))
1603 break;
1604 }
1605 s->print("d%d", 2 * j);
1606 if ( j != last ) s->print(" - d%d", last);
1607 s->print(" = %f", val);
1608 s->fill_to(30);
1609 s->print("(0x%x)", *(int*)&val);
1610 s->fill_to(42);
1611 s->print_cr("(0x%x)", *(1 + (int*)&val));
1612 j = last + 1;
1613 }
1614 s->cr();
1615 }
1617 void RegistersForDebugging::save_registers(MacroAssembler* a) {
1618 a->sub(FP, round_to(sizeof(RegistersForDebugging), sizeof(jdouble)) - STACK_BIAS, O0);
1619 a->flush_windows();
1620 int i;
1621 for (i = 0; i < 8; ++i) {
1622 a->ld_ptr(as_iRegister(i)->address_in_saved_window().after_save(), L1); a->st_ptr( L1, O0, i_offset(i));
1623 a->ld_ptr(as_lRegister(i)->address_in_saved_window().after_save(), L1); a->st_ptr( L1, O0, l_offset(i));
1624 a->st_ptr(as_oRegister(i)->after_save(), O0, o_offset(i));
1625 a->st_ptr(as_gRegister(i)->after_save(), O0, g_offset(i));
1626 }
1627 for (i = 0; i < 32; ++i) {
1628 a->stf(FloatRegisterImpl::S, as_FloatRegister(i), O0, f_offset(i));
1629 }
1630 for (i = 0; i < (VM_Version::v9_instructions_work() ? 64 : 32); i += 2) {
1631 a->stf(FloatRegisterImpl::D, as_FloatRegister(i), O0, d_offset(i));
1632 }
1633 }
1635 void RegistersForDebugging::restore_registers(MacroAssembler* a, Register r) {
1636 for (int i = 1; i < 8; ++i) {
1637 a->ld_ptr(r, g_offset(i), as_gRegister(i));
1638 }
1639 for (int j = 0; j < 32; ++j) {
1640 a->ldf(FloatRegisterImpl::S, O0, f_offset(j), as_FloatRegister(j));
1641 }
1642 for (int k = 0; k < (VM_Version::v9_instructions_work() ? 64 : 32); k += 2) {
1643 a->ldf(FloatRegisterImpl::D, O0, d_offset(k), as_FloatRegister(k));
1644 }
1645 }
1648 // pushes double TOS element of FPU stack on CPU stack; pops from FPU stack
1649 void MacroAssembler::push_fTOS() {
1650 // %%%%%% need to implement this
1651 }
1653 // pops double TOS element from CPU stack and pushes on FPU stack
1654 void MacroAssembler::pop_fTOS() {
1655 // %%%%%% need to implement this
1656 }
1658 void MacroAssembler::empty_FPU_stack() {
1659 // %%%%%% need to implement this
1660 }
1662 void MacroAssembler::_verify_oop(Register reg, const char* msg, const char * file, int line) {
1663 // plausibility check for oops
1664 if (!VerifyOops) return;
1666 if (reg == G0) return; // always NULL, which is always an oop
1668 char buffer[64];
1669 #ifdef COMPILER1
1670 if (CommentedAssembly) {
1671 snprintf(buffer, sizeof(buffer), "verify_oop at %d", offset());
1672 block_comment(buffer);
1673 }
1674 #endif
1676 int len = strlen(file) + strlen(msg) + 1 + 4;
1677 sprintf(buffer, "%d", line);
1678 len += strlen(buffer);
1679 sprintf(buffer, " at offset %d ", offset());
1680 len += strlen(buffer);
1681 char * real_msg = new char[len];
1682 sprintf(real_msg, "%s%s(%s:%d)", msg, buffer, file, line);
1684 // Call indirectly to solve generation ordering problem
1685 Address a(O7, (address)StubRoutines::verify_oop_subroutine_entry_address());
1687 // Make some space on stack above the current register window.
1688 // Enough to hold 8 64-bit registers.
1689 add(SP,-8*8,SP);
1691 // Save some 64-bit registers; a normal 'save' chops the heads off
1692 // of 64-bit longs in the 32-bit build.
1693 stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
1694 stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
1695 mov(reg,O0); // Move arg into O0; arg might be in O7 which is about to be crushed
1696 stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
1698 set((intptr_t)real_msg, O1);
1699 // Load address to call to into O7
1700 load_ptr_contents(a, O7);
1701 // Register call to verify_oop_subroutine
1702 callr(O7, G0);
1703 delayed()->nop();
1704 // recover frame size
1705 add(SP, 8*8,SP);
1706 }
1708 void MacroAssembler::_verify_oop_addr(Address addr, const char* msg, const char * file, int line) {
1709 // plausibility check for oops
1710 if (!VerifyOops) return;
1712 char buffer[64];
1713 sprintf(buffer, "%d", line);
1714 int len = strlen(file) + strlen(msg) + 1 + 4 + strlen(buffer);
1715 sprintf(buffer, " at SP+%d ", addr.disp());
1716 len += strlen(buffer);
1717 char * real_msg = new char[len];
1718 sprintf(real_msg, "%s at SP+%d (%s:%d)", msg, addr.disp(), file, line);
1720 // Call indirectly to solve generation ordering problem
1721 Address a(O7, (address)StubRoutines::verify_oop_subroutine_entry_address());
1723 // Make some space on stack above the current register window.
1724 // Enough to hold 8 64-bit registers.
1725 add(SP,-8*8,SP);
1727 // Save some 64-bit registers; a normal 'save' chops the heads off
1728 // of 64-bit longs in the 32-bit build.
1729 stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
1730 stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
1731 ld_ptr(addr.base(), addr.disp() + 8*8, O0); // Load arg into O0; arg might be in O7 which is about to be crushed
1732 stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
1734 set((intptr_t)real_msg, O1);
1735 // Load address to call to into O7
1736 load_ptr_contents(a, O7);
1737 // Register call to verify_oop_subroutine
1738 callr(O7, G0);
1739 delayed()->nop();
1740 // recover frame size
1741 add(SP, 8*8,SP);
1742 }
1744 // side-door communication with signalHandler in os_solaris.cpp
1745 address MacroAssembler::_verify_oop_implicit_branch[3] = { NULL };
1747 // This macro is expanded just once; it creates shared code. Contract:
1748 // receives an oop in O0. Must restore O0 & O7 from TLS. Must not smash ANY
1749 // registers, including flags. May not use a register 'save', as this blows
1750 // the high bits of the O-regs if they contain Long values. Acts as a 'leaf'
1751 // call.
1752 void MacroAssembler::verify_oop_subroutine() {
1753 assert( VM_Version::v9_instructions_work(), "VerifyOops not supported for V8" );
1755 // Leaf call; no frame.
1756 Label succeed, fail, null_or_fail;
1758 // O0 and O7 were saved already (O0 in O0's TLS home, O7 in O5's TLS home).
1759 // O0 is now the oop to be checked. O7 is the return address.
1760 Register O0_obj = O0;
1762 // Save some more registers for temps.
1763 stx(O2,SP,frame::register_save_words*wordSize+STACK_BIAS+2*8);
1764 stx(O3,SP,frame::register_save_words*wordSize+STACK_BIAS+3*8);
1765 stx(O4,SP,frame::register_save_words*wordSize+STACK_BIAS+4*8);
1766 stx(O5,SP,frame::register_save_words*wordSize+STACK_BIAS+5*8);
1768 // Save flags
1769 Register O5_save_flags = O5;
1770 rdccr( O5_save_flags );
1772 { // count number of verifies
1773 Register O2_adr = O2;
1774 Register O3_accum = O3;
1775 Address count_addr( O2_adr, (address) StubRoutines::verify_oop_count_addr() );
1776 sethi(count_addr);
1777 ld(count_addr, O3_accum);
1778 inc(O3_accum);
1779 st(O3_accum, count_addr);
1780 }
1782 Register O2_mask = O2;
1783 Register O3_bits = O3;
1784 Register O4_temp = O4;
1786 // mark lower end of faulting range
1787 assert(_verify_oop_implicit_branch[0] == NULL, "set once");
1788 _verify_oop_implicit_branch[0] = pc();
1790 // We can't check the mark oop because it could be in the process of
1791 // locking or unlocking while this is running.
1792 set(Universe::verify_oop_mask (), O2_mask);
1793 set(Universe::verify_oop_bits (), O3_bits);
1795 // assert((obj & oop_mask) == oop_bits);
1796 and3(O0_obj, O2_mask, O4_temp);
1797 cmp(O4_temp, O3_bits);
1798 brx(notEqual, false, pn, null_or_fail);
1799 delayed()->nop();
1801 if ((NULL_WORD & Universe::verify_oop_mask()) == Universe::verify_oop_bits()) {
1802 // the null_or_fail case is useless; must test for null separately
1803 br_null(O0_obj, false, pn, succeed);
1804 delayed()->nop();
1805 }
1807 // Check the klassOop of this object for being in the right area of memory.
1808 // Cannot do the load in the delay above slot in case O0 is null
1809 load_klass(O0_obj, O0_obj);
1810 // assert((klass & klass_mask) == klass_bits);
1811 if( Universe::verify_klass_mask() != Universe::verify_oop_mask() )
1812 set(Universe::verify_klass_mask(), O2_mask);
1813 if( Universe::verify_klass_bits() != Universe::verify_oop_bits() )
1814 set(Universe::verify_klass_bits(), O3_bits);
1815 and3(O0_obj, O2_mask, O4_temp);
1816 cmp(O4_temp, O3_bits);
1817 brx(notEqual, false, pn, fail);
1818 delayed()->nop();
1819 // Check the klass's klass
1820 load_klass(O0_obj, O0_obj);
1821 and3(O0_obj, O2_mask, O4_temp);
1822 cmp(O4_temp, O3_bits);
1823 brx(notEqual, false, pn, fail);
1824 delayed()->wrccr( O5_save_flags ); // Restore CCR's
1826 // mark upper end of faulting range
1827 _verify_oop_implicit_branch[1] = pc();
1829 //-----------------------
1830 // all tests pass
1831 bind(succeed);
1833 // Restore prior 64-bit registers
1834 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+0*8,O0);
1835 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+1*8,O1);
1836 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+2*8,O2);
1837 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+3*8,O3);
1838 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+4*8,O4);
1839 ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+5*8,O5);
1841 retl(); // Leaf return; restore prior O7 in delay slot
1842 delayed()->ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+7*8,O7);
1844 //-----------------------
1845 bind(null_or_fail); // nulls are less common but OK
1846 br_null(O0_obj, false, pt, succeed);
1847 delayed()->wrccr( O5_save_flags ); // Restore CCR's
1849 //-----------------------
1850 // report failure:
1851 bind(fail);
1852 _verify_oop_implicit_branch[2] = pc();
1854 wrccr( O5_save_flags ); // Restore CCR's
1856 save_frame(::round_to(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1858 // stop_subroutine expects message pointer in I1.
1859 mov(I1, O1);
1861 // Restore prior 64-bit registers
1862 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+0*8,I0);
1863 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+1*8,I1);
1864 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+2*8,I2);
1865 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+3*8,I3);
1866 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+4*8,I4);
1867 ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+5*8,I5);
1869 // factor long stop-sequence into subroutine to save space
1870 assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
1872 // call indirectly to solve generation ordering problem
1873 Address a(O5, (address)StubRoutines::Sparc::stop_subroutine_entry_address());
1874 load_ptr_contents(a, O5);
1875 jmpl(O5, 0, O7);
1876 delayed()->nop();
1877 }
1880 void MacroAssembler::stop(const char* msg) {
1881 // save frame first to get O7 for return address
1882 // add one word to size in case struct is odd number of words long
1883 // It must be doubleword-aligned for storing doubles into it.
1885 save_frame(::round_to(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1887 // stop_subroutine expects message pointer in I1.
1888 set((intptr_t)msg, O1);
1890 // factor long stop-sequence into subroutine to save space
1891 assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
1893 // call indirectly to solve generation ordering problem
1894 Address a(O5, (address)StubRoutines::Sparc::stop_subroutine_entry_address());
1895 load_ptr_contents(a, O5);
1896 jmpl(O5, 0, O7);
1897 delayed()->nop();
1899 breakpoint_trap(); // make stop actually stop rather than writing
1900 // unnoticeable results in the output files.
1902 // restore(); done in callee to save space!
1903 }
1906 void MacroAssembler::warn(const char* msg) {
1907 save_frame(::round_to(sizeof(RegistersForDebugging) / BytesPerWord, 2));
1908 RegistersForDebugging::save_registers(this);
1909 mov(O0, L0);
1910 set((intptr_t)msg, O0);
1911 call( CAST_FROM_FN_PTR(address, warning) );
1912 delayed()->nop();
1913 // ret();
1914 // delayed()->restore();
1915 RegistersForDebugging::restore_registers(this, L0);
1916 restore();
1917 }
1920 void MacroAssembler::untested(const char* what) {
1921 // We must be able to turn interactive prompting off
1922 // in order to run automated test scripts on the VM
1923 // Use the flag ShowMessageBoxOnError
1925 char* b = new char[1024];
1926 sprintf(b, "untested: %s", what);
1928 if ( ShowMessageBoxOnError ) stop(b);
1929 else warn(b);
1930 }
1933 void MacroAssembler::stop_subroutine() {
1934 RegistersForDebugging::save_registers(this);
1936 // for the sake of the debugger, stick a PC on the current frame
1937 // (this assumes that the caller has performed an extra "save")
1938 mov(I7, L7);
1939 add(O7, -7 * BytesPerInt, I7);
1941 save_frame(); // one more save to free up another O7 register
1942 mov(I0, O1); // addr of reg save area
1944 // We expect pointer to message in I1. Caller must set it up in O1
1945 mov(I1, O0); // get msg
1946 call (CAST_FROM_FN_PTR(address, MacroAssembler::debug), relocInfo::runtime_call_type);
1947 delayed()->nop();
1949 restore();
1951 RegistersForDebugging::restore_registers(this, O0);
1953 save_frame(0);
1954 call(CAST_FROM_FN_PTR(address,breakpoint));
1955 delayed()->nop();
1956 restore();
1958 mov(L7, I7);
1959 retl();
1960 delayed()->restore(); // see stop above
1961 }
1964 void MacroAssembler::debug(char* msg, RegistersForDebugging* regs) {
1965 if ( ShowMessageBoxOnError ) {
1966 JavaThreadState saved_state = JavaThread::current()->thread_state();
1967 JavaThread::current()->set_thread_state(_thread_in_vm);
1968 {
1969 // In order to get locks work, we need to fake a in_VM state
1970 ttyLocker ttyl;
1971 ::tty->print_cr("EXECUTION STOPPED: %s\n", msg);
1972 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
1973 ::tty->print_cr("Interpreter::bytecode_counter = %d", BytecodeCounter::counter_value());
1974 }
1975 if (os::message_box(msg, "Execution stopped, print registers?"))
1976 regs->print(::tty);
1977 }
1978 ThreadStateTransition::transition(JavaThread::current(), _thread_in_vm, saved_state);
1979 }
1980 else
1981 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", msg);
1982 assert(false, "error");
1983 }
1986 #ifndef PRODUCT
1987 void MacroAssembler::test() {
1988 ResourceMark rm;
1990 CodeBuffer cb("test", 10000, 10000);
1991 MacroAssembler* a = new MacroAssembler(&cb);
1992 VM_Version::allow_all();
1993 a->test_v9();
1994 a->test_v8_onlys();
1995 VM_Version::revert();
1997 StubRoutines::Sparc::test_stop_entry()();
1998 }
1999 #endif
2002 void MacroAssembler::calc_mem_param_words(Register Rparam_words, Register Rresult) {
2003 subcc( Rparam_words, Argument::n_register_parameters, Rresult); // how many mem words?
2004 Label no_extras;
2005 br( negative, true, pt, no_extras ); // if neg, clear reg
2006 delayed()->set( 0, Rresult); // annuled, so only if taken
2007 bind( no_extras );
2008 }
2011 void MacroAssembler::calc_frame_size(Register Rextra_words, Register Rresult) {
2012 #ifdef _LP64
2013 add(Rextra_words, frame::memory_parameter_word_sp_offset, Rresult);
2014 #else
2015 add(Rextra_words, frame::memory_parameter_word_sp_offset + 1, Rresult);
2016 #endif
2017 bclr(1, Rresult);
2018 sll(Rresult, LogBytesPerWord, Rresult); // Rresult has total frame bytes
2019 }
2022 void MacroAssembler::calc_frame_size_and_save(Register Rextra_words, Register Rresult) {
2023 calc_frame_size(Rextra_words, Rresult);
2024 neg(Rresult);
2025 save(SP, Rresult, SP);
2026 }
2029 // ---------------------------------------------------------
2030 Assembler::RCondition cond2rcond(Assembler::Condition c) {
2031 switch (c) {
2032 /*case zero: */
2033 case Assembler::equal: return Assembler::rc_z;
2034 case Assembler::lessEqual: return Assembler::rc_lez;
2035 case Assembler::less: return Assembler::rc_lz;
2036 /*case notZero:*/
2037 case Assembler::notEqual: return Assembler::rc_nz;
2038 case Assembler::greater: return Assembler::rc_gz;
2039 case Assembler::greaterEqual: return Assembler::rc_gez;
2040 }
2041 ShouldNotReachHere();
2042 return Assembler::rc_z;
2043 }
2045 // compares register with zero and branches. NOT FOR USE WITH 64-bit POINTERS
2046 void MacroAssembler::br_zero( Condition c, bool a, Predict p, Register s1, Label& L) {
2047 tst(s1);
2048 br (c, a, p, L);
2049 }
2052 // Compares a pointer register with zero and branches on null.
2053 // Does a test & branch on 32-bit systems and a register-branch on 64-bit.
2054 void MacroAssembler::br_null( Register s1, bool a, Predict p, Label& L ) {
2055 assert_not_delayed();
2056 #ifdef _LP64
2057 bpr( rc_z, a, p, s1, L );
2058 #else
2059 tst(s1);
2060 br ( zero, a, p, L );
2061 #endif
2062 }
2064 void MacroAssembler::br_notnull( Register s1, bool a, Predict p, Label& L ) {
2065 assert_not_delayed();
2066 #ifdef _LP64
2067 bpr( rc_nz, a, p, s1, L );
2068 #else
2069 tst(s1);
2070 br ( notZero, a, p, L );
2071 #endif
2072 }
2074 void MacroAssembler::br_on_reg_cond( RCondition rc, bool a, Predict p,
2075 Register s1, address d,
2076 relocInfo::relocType rt ) {
2077 if (VM_Version::v9_instructions_work()) {
2078 bpr(rc, a, p, s1, d, rt);
2079 } else {
2080 tst(s1);
2081 br(reg_cond_to_cc_cond(rc), a, p, d, rt);
2082 }
2083 }
2085 void MacroAssembler::br_on_reg_cond( RCondition rc, bool a, Predict p,
2086 Register s1, Label& L ) {
2087 if (VM_Version::v9_instructions_work()) {
2088 bpr(rc, a, p, s1, L);
2089 } else {
2090 tst(s1);
2091 br(reg_cond_to_cc_cond(rc), a, p, L);
2092 }
2093 }
2096 // instruction sequences factored across compiler & interpreter
2099 void MacroAssembler::lcmp( Register Ra_hi, Register Ra_low,
2100 Register Rb_hi, Register Rb_low,
2101 Register Rresult) {
2103 Label check_low_parts, done;
2105 cmp(Ra_hi, Rb_hi ); // compare hi parts
2106 br(equal, true, pt, check_low_parts);
2107 delayed()->cmp(Ra_low, Rb_low); // test low parts
2109 // And, with an unsigned comparison, it does not matter if the numbers
2110 // are negative or not.
2111 // E.g., -2 cmp -1: the low parts are 0xfffffffe and 0xffffffff.
2112 // The second one is bigger (unsignedly).
2114 // Other notes: The first move in each triplet can be unconditional
2115 // (and therefore probably prefetchable).
2116 // And the equals case for the high part does not need testing,
2117 // since that triplet is reached only after finding the high halves differ.
2119 if (VM_Version::v9_instructions_work()) {
2121 mov ( -1, Rresult);
2122 ba( false, done ); delayed()-> movcc(greater, false, icc, 1, Rresult);
2123 }
2124 else {
2125 br(less, true, pt, done); delayed()-> set(-1, Rresult);
2126 br(greater, true, pt, done); delayed()-> set( 1, Rresult);
2127 }
2129 bind( check_low_parts );
2131 if (VM_Version::v9_instructions_work()) {
2132 mov( -1, Rresult);
2133 movcc(equal, false, icc, 0, Rresult);
2134 movcc(greaterUnsigned, false, icc, 1, Rresult);
2135 }
2136 else {
2137 set(-1, Rresult);
2138 br(equal, true, pt, done); delayed()->set( 0, Rresult);
2139 br(greaterUnsigned, true, pt, done); delayed()->set( 1, Rresult);
2140 }
2141 bind( done );
2142 }
2144 void MacroAssembler::lneg( Register Rhi, Register Rlow ) {
2145 subcc( G0, Rlow, Rlow );
2146 subc( G0, Rhi, Rhi );
2147 }
2149 void MacroAssembler::lshl( Register Rin_high, Register Rin_low,
2150 Register Rcount,
2151 Register Rout_high, Register Rout_low,
2152 Register Rtemp ) {
2155 Register Ralt_count = Rtemp;
2156 Register Rxfer_bits = Rtemp;
2158 assert( Ralt_count != Rin_high
2159 && Ralt_count != Rin_low
2160 && Ralt_count != Rcount
2161 && Rxfer_bits != Rin_low
2162 && Rxfer_bits != Rin_high
2163 && Rxfer_bits != Rcount
2164 && Rxfer_bits != Rout_low
2165 && Rout_low != Rin_high,
2166 "register alias checks");
2168 Label big_shift, done;
2170 // This code can be optimized to use the 64 bit shifts in V9.
2171 // Here we use the 32 bit shifts.
2173 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
2174 subcc(Rcount, 31, Ralt_count);
2175 br(greater, true, pn, big_shift);
2176 delayed()->
2177 dec(Ralt_count);
2179 // shift < 32 bits, Ralt_count = Rcount-31
2181 // We get the transfer bits by shifting right by 32-count the low
2182 // register. This is done by shifting right by 31-count and then by one
2183 // more to take care of the special (rare) case where count is zero
2184 // (shifting by 32 would not work).
2186 neg( Ralt_count );
2188 // The order of the next two instructions is critical in the case where
2189 // Rin and Rout are the same and should not be reversed.
2191 srl( Rin_low, Ralt_count, Rxfer_bits ); // shift right by 31-count
2192 if (Rcount != Rout_low) {
2193 sll( Rin_low, Rcount, Rout_low ); // low half
2194 }
2195 sll( Rin_high, Rcount, Rout_high );
2196 if (Rcount == Rout_low) {
2197 sll( Rin_low, Rcount, Rout_low ); // low half
2198 }
2199 srl( Rxfer_bits, 1, Rxfer_bits ); // shift right by one more
2200 ba (false, done);
2201 delayed()->
2202 or3( Rout_high, Rxfer_bits, Rout_high); // new hi value: or in shifted old hi part and xfer from low
2204 // shift >= 32 bits, Ralt_count = Rcount-32
2205 bind(big_shift);
2206 sll( Rin_low, Ralt_count, Rout_high );
2207 clr( Rout_low );
2209 bind(done);
2210 }
2213 void MacroAssembler::lshr( Register Rin_high, Register Rin_low,
2214 Register Rcount,
2215 Register Rout_high, Register Rout_low,
2216 Register Rtemp ) {
2218 Register Ralt_count = Rtemp;
2219 Register Rxfer_bits = Rtemp;
2221 assert( Ralt_count != Rin_high
2222 && Ralt_count != Rin_low
2223 && Ralt_count != Rcount
2224 && Rxfer_bits != Rin_low
2225 && Rxfer_bits != Rin_high
2226 && Rxfer_bits != Rcount
2227 && Rxfer_bits != Rout_high
2228 && Rout_high != Rin_low,
2229 "register alias checks");
2231 Label big_shift, done;
2233 // This code can be optimized to use the 64 bit shifts in V9.
2234 // Here we use the 32 bit shifts.
2236 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
2237 subcc(Rcount, 31, Ralt_count);
2238 br(greater, true, pn, big_shift);
2239 delayed()->dec(Ralt_count);
2241 // shift < 32 bits, Ralt_count = Rcount-31
2243 // We get the transfer bits by shifting left by 32-count the high
2244 // register. This is done by shifting left by 31-count and then by one
2245 // more to take care of the special (rare) case where count is zero
2246 // (shifting by 32 would not work).
2248 neg( Ralt_count );
2249 if (Rcount != Rout_low) {
2250 srl( Rin_low, Rcount, Rout_low );
2251 }
2253 // The order of the next two instructions is critical in the case where
2254 // Rin and Rout are the same and should not be reversed.
2256 sll( Rin_high, Ralt_count, Rxfer_bits ); // shift left by 31-count
2257 sra( Rin_high, Rcount, Rout_high ); // high half
2258 sll( Rxfer_bits, 1, Rxfer_bits ); // shift left by one more
2259 if (Rcount == Rout_low) {
2260 srl( Rin_low, Rcount, Rout_low );
2261 }
2262 ba (false, done);
2263 delayed()->
2264 or3( Rout_low, Rxfer_bits, Rout_low ); // new low value: or shifted old low part and xfer from high
2266 // shift >= 32 bits, Ralt_count = Rcount-32
2267 bind(big_shift);
2269 sra( Rin_high, Ralt_count, Rout_low );
2270 sra( Rin_high, 31, Rout_high ); // sign into hi
2272 bind( done );
2273 }
2277 void MacroAssembler::lushr( Register Rin_high, Register Rin_low,
2278 Register Rcount,
2279 Register Rout_high, Register Rout_low,
2280 Register Rtemp ) {
2282 Register Ralt_count = Rtemp;
2283 Register Rxfer_bits = Rtemp;
2285 assert( Ralt_count != Rin_high
2286 && Ralt_count != Rin_low
2287 && Ralt_count != Rcount
2288 && Rxfer_bits != Rin_low
2289 && Rxfer_bits != Rin_high
2290 && Rxfer_bits != Rcount
2291 && Rxfer_bits != Rout_high
2292 && Rout_high != Rin_low,
2293 "register alias checks");
2295 Label big_shift, done;
2297 // This code can be optimized to use the 64 bit shifts in V9.
2298 // Here we use the 32 bit shifts.
2300 and3( Rcount, 0x3f, Rcount); // take least significant 6 bits
2301 subcc(Rcount, 31, Ralt_count);
2302 br(greater, true, pn, big_shift);
2303 delayed()->dec(Ralt_count);
2305 // shift < 32 bits, Ralt_count = Rcount-31
2307 // We get the transfer bits by shifting left by 32-count the high
2308 // register. This is done by shifting left by 31-count and then by one
2309 // more to take care of the special (rare) case where count is zero
2310 // (shifting by 32 would not work).
2312 neg( Ralt_count );
2313 if (Rcount != Rout_low) {
2314 srl( Rin_low, Rcount, Rout_low );
2315 }
2317 // The order of the next two instructions is critical in the case where
2318 // Rin and Rout are the same and should not be reversed.
2320 sll( Rin_high, Ralt_count, Rxfer_bits ); // shift left by 31-count
2321 srl( Rin_high, Rcount, Rout_high ); // high half
2322 sll( Rxfer_bits, 1, Rxfer_bits ); // shift left by one more
2323 if (Rcount == Rout_low) {
2324 srl( Rin_low, Rcount, Rout_low );
2325 }
2326 ba (false, done);
2327 delayed()->
2328 or3( Rout_low, Rxfer_bits, Rout_low ); // new low value: or shifted old low part and xfer from high
2330 // shift >= 32 bits, Ralt_count = Rcount-32
2331 bind(big_shift);
2333 srl( Rin_high, Ralt_count, Rout_low );
2334 clr( Rout_high );
2336 bind( done );
2337 }
2339 #ifdef _LP64
2340 void MacroAssembler::lcmp( Register Ra, Register Rb, Register Rresult) {
2341 cmp(Ra, Rb);
2342 mov( -1, Rresult);
2343 movcc(equal, false, xcc, 0, Rresult);
2344 movcc(greater, false, xcc, 1, Rresult);
2345 }
2346 #endif
2349 void MacroAssembler::float_cmp( bool is_float, int unordered_result,
2350 FloatRegister Fa, FloatRegister Fb,
2351 Register Rresult) {
2353 fcmp(is_float ? FloatRegisterImpl::S : FloatRegisterImpl::D, fcc0, Fa, Fb);
2355 Condition lt = unordered_result == -1 ? f_unorderedOrLess : f_less;
2356 Condition eq = f_equal;
2357 Condition gt = unordered_result == 1 ? f_unorderedOrGreater : f_greater;
2359 if (VM_Version::v9_instructions_work()) {
2361 mov( -1, Rresult );
2362 movcc( eq, true, fcc0, 0, Rresult );
2363 movcc( gt, true, fcc0, 1, Rresult );
2365 } else {
2366 Label done;
2368 set( -1, Rresult );
2369 //fb(lt, true, pn, done); delayed()->set( -1, Rresult );
2370 fb( eq, true, pn, done); delayed()->set( 0, Rresult );
2371 fb( gt, true, pn, done); delayed()->set( 1, Rresult );
2373 bind (done);
2374 }
2375 }
2378 void MacroAssembler::fneg( FloatRegisterImpl::Width w, FloatRegister s, FloatRegister d)
2379 {
2380 if (VM_Version::v9_instructions_work()) {
2381 Assembler::fneg(w, s, d);
2382 } else {
2383 if (w == FloatRegisterImpl::S) {
2384 Assembler::fneg(w, s, d);
2385 } else if (w == FloatRegisterImpl::D) {
2386 // number() does a sanity check on the alignment.
2387 assert(((s->encoding(FloatRegisterImpl::D) & 1) == 0) &&
2388 ((d->encoding(FloatRegisterImpl::D) & 1) == 0), "float register alignment check");
2390 Assembler::fneg(FloatRegisterImpl::S, s, d);
2391 Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
2392 } else {
2393 assert(w == FloatRegisterImpl::Q, "Invalid float register width");
2395 // number() does a sanity check on the alignment.
2396 assert(((s->encoding(FloatRegisterImpl::D) & 3) == 0) &&
2397 ((d->encoding(FloatRegisterImpl::D) & 3) == 0), "float register alignment check");
2399 Assembler::fneg(FloatRegisterImpl::S, s, d);
2400 Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
2401 Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor(), d->successor()->successor());
2402 Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor()->successor(), d->successor()->successor()->successor());
2403 }
2404 }
2405 }
2407 void MacroAssembler::fmov( FloatRegisterImpl::Width w, FloatRegister s, FloatRegister d)
2408 {
2409 if (VM_Version::v9_instructions_work()) {
2410 Assembler::fmov(w, s, d);
2411 } else {
2412 if (w == FloatRegisterImpl::S) {
2413 Assembler::fmov(w, s, d);
2414 } else if (w == FloatRegisterImpl::D) {
2415 // number() does a sanity check on the alignment.
2416 assert(((s->encoding(FloatRegisterImpl::D) & 1) == 0) &&
2417 ((d->encoding(FloatRegisterImpl::D) & 1) == 0), "float register alignment check");
2419 Assembler::fmov(FloatRegisterImpl::S, s, d);
2420 Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
2421 } else {
2422 assert(w == FloatRegisterImpl::Q, "Invalid float register width");
2424 // number() does a sanity check on the alignment.
2425 assert(((s->encoding(FloatRegisterImpl::D) & 3) == 0) &&
2426 ((d->encoding(FloatRegisterImpl::D) & 3) == 0), "float register alignment check");
2428 Assembler::fmov(FloatRegisterImpl::S, s, d);
2429 Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
2430 Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor(), d->successor()->successor());
2431 Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor()->successor(), d->successor()->successor()->successor());
2432 }
2433 }
2434 }
2436 void MacroAssembler::fabs( FloatRegisterImpl::Width w, FloatRegister s, FloatRegister d)
2437 {
2438 if (VM_Version::v9_instructions_work()) {
2439 Assembler::fabs(w, s, d);
2440 } else {
2441 if (w == FloatRegisterImpl::S) {
2442 Assembler::fabs(w, s, d);
2443 } else if (w == FloatRegisterImpl::D) {
2444 // number() does a sanity check on the alignment.
2445 assert(((s->encoding(FloatRegisterImpl::D) & 1) == 0) &&
2446 ((d->encoding(FloatRegisterImpl::D) & 1) == 0), "float register alignment check");
2448 Assembler::fabs(FloatRegisterImpl::S, s, d);
2449 Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
2450 } else {
2451 assert(w == FloatRegisterImpl::Q, "Invalid float register width");
2453 // number() does a sanity check on the alignment.
2454 assert(((s->encoding(FloatRegisterImpl::D) & 3) == 0) &&
2455 ((d->encoding(FloatRegisterImpl::D) & 3) == 0), "float register alignment check");
2457 Assembler::fabs(FloatRegisterImpl::S, s, d);
2458 Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
2459 Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor(), d->successor()->successor());
2460 Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor()->successor(), d->successor()->successor()->successor());
2461 }
2462 }
2463 }
2465 void MacroAssembler::save_all_globals_into_locals() {
2466 mov(G1,L1);
2467 mov(G2,L2);
2468 mov(G3,L3);
2469 mov(G4,L4);
2470 mov(G5,L5);
2471 mov(G6,L6);
2472 mov(G7,L7);
2473 }
2475 void MacroAssembler::restore_globals_from_locals() {
2476 mov(L1,G1);
2477 mov(L2,G2);
2478 mov(L3,G3);
2479 mov(L4,G4);
2480 mov(L5,G5);
2481 mov(L6,G6);
2482 mov(L7,G7);
2483 }
2485 // Use for 64 bit operation.
2486 void MacroAssembler::casx_under_lock(Register top_ptr_reg, Register top_reg, Register ptr_reg, address lock_addr, bool use_call_vm)
2487 {
2488 // store ptr_reg as the new top value
2489 #ifdef _LP64
2490 casx(top_ptr_reg, top_reg, ptr_reg);
2491 #else
2492 cas_under_lock(top_ptr_reg, top_reg, ptr_reg, lock_addr, use_call_vm);
2493 #endif // _LP64
2494 }
2496 // [RGV] This routine does not handle 64 bit operations.
2497 // use casx_under_lock() or casx directly!!!
2498 void MacroAssembler::cas_under_lock(Register top_ptr_reg, Register top_reg, Register ptr_reg, address lock_addr, bool use_call_vm)
2499 {
2500 // store ptr_reg as the new top value
2501 if (VM_Version::v9_instructions_work()) {
2502 cas(top_ptr_reg, top_reg, ptr_reg);
2503 } else {
2505 // If the register is not an out nor global, it is not visible
2506 // after the save. Allocate a register for it, save its
2507 // value in the register save area (the save may not flush
2508 // registers to the save area).
2510 Register top_ptr_reg_after_save;
2511 Register top_reg_after_save;
2512 Register ptr_reg_after_save;
2514 if (top_ptr_reg->is_out() || top_ptr_reg->is_global()) {
2515 top_ptr_reg_after_save = top_ptr_reg->after_save();
2516 } else {
2517 Address reg_save_addr = top_ptr_reg->address_in_saved_window();
2518 top_ptr_reg_after_save = L0;
2519 st(top_ptr_reg, reg_save_addr);
2520 }
2522 if (top_reg->is_out() || top_reg->is_global()) {
2523 top_reg_after_save = top_reg->after_save();
2524 } else {
2525 Address reg_save_addr = top_reg->address_in_saved_window();
2526 top_reg_after_save = L1;
2527 st(top_reg, reg_save_addr);
2528 }
2530 if (ptr_reg->is_out() || ptr_reg->is_global()) {
2531 ptr_reg_after_save = ptr_reg->after_save();
2532 } else {
2533 Address reg_save_addr = ptr_reg->address_in_saved_window();
2534 ptr_reg_after_save = L2;
2535 st(ptr_reg, reg_save_addr);
2536 }
2538 const Register& lock_reg = L3;
2539 const Register& lock_ptr_reg = L4;
2540 const Register& value_reg = L5;
2541 const Register& yield_reg = L6;
2542 const Register& yieldall_reg = L7;
2544 save_frame();
2546 if (top_ptr_reg_after_save == L0) {
2547 ld(top_ptr_reg->address_in_saved_window().after_save(), top_ptr_reg_after_save);
2548 }
2550 if (top_reg_after_save == L1) {
2551 ld(top_reg->address_in_saved_window().after_save(), top_reg_after_save);
2552 }
2554 if (ptr_reg_after_save == L2) {
2555 ld(ptr_reg->address_in_saved_window().after_save(), ptr_reg_after_save);
2556 }
2558 Label(retry_get_lock);
2559 Label(not_same);
2560 Label(dont_yield);
2562 assert(lock_addr, "lock_address should be non null for v8");
2563 set((intptr_t)lock_addr, lock_ptr_reg);
2564 // Initialize yield counter
2565 mov(G0,yield_reg);
2566 mov(G0, yieldall_reg);
2567 set(StubRoutines::Sparc::locked, lock_reg);
2569 bind(retry_get_lock);
2570 cmp(yield_reg, V8AtomicOperationUnderLockSpinCount);
2571 br(Assembler::less, false, Assembler::pt, dont_yield);
2572 delayed()->nop();
2574 if(use_call_vm) {
2575 Untested("Need to verify global reg consistancy");
2576 call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::yield_all), yieldall_reg);
2577 } else {
2578 // Save the regs and make space for a C call
2579 save(SP, -96, SP);
2580 save_all_globals_into_locals();
2581 call(CAST_FROM_FN_PTR(address,os::yield_all));
2582 delayed()->mov(yieldall_reg, O0);
2583 restore_globals_from_locals();
2584 restore();
2585 }
2587 // reset the counter
2588 mov(G0,yield_reg);
2589 add(yieldall_reg, 1, yieldall_reg);
2591 bind(dont_yield);
2592 // try to get lock
2593 swap(lock_ptr_reg, 0, lock_reg);
2595 // did we get the lock?
2596 cmp(lock_reg, StubRoutines::Sparc::unlocked);
2597 br(Assembler::notEqual, true, Assembler::pn, retry_get_lock);
2598 delayed()->add(yield_reg,1,yield_reg);
2600 // yes, got lock. do we have the same top?
2601 ld(top_ptr_reg_after_save, 0, value_reg);
2602 cmp(value_reg, top_reg_after_save);
2603 br(Assembler::notEqual, false, Assembler::pn, not_same);
2604 delayed()->nop();
2606 // yes, same top.
2607 st(ptr_reg_after_save, top_ptr_reg_after_save, 0);
2608 membar(Assembler::StoreStore);
2610 bind(not_same);
2611 mov(value_reg, ptr_reg_after_save);
2612 st(lock_reg, lock_ptr_reg, 0); // unlock
2614 restore();
2615 }
2616 }
2618 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr,
2619 Register tmp,
2620 int offset) {
2621 intptr_t value = *delayed_value_addr;
2622 if (value != 0)
2623 return RegisterOrConstant(value + offset);
2625 // load indirectly to solve generation ordering problem
2626 Address a(tmp, (address) delayed_value_addr);
2627 load_ptr_contents(a, tmp);
2629 #ifdef ASSERT
2630 tst(tmp);
2631 breakpoint_trap(zero, xcc);
2632 #endif
2634 if (offset != 0)
2635 add(tmp, offset, tmp);
2637 return RegisterOrConstant(tmp);
2638 }
2641 void MacroAssembler::regcon_inc_ptr( RegisterOrConstant& dest, RegisterOrConstant src, Register temp ) {
2642 assert(dest.register_or_noreg() != G0, "lost side effect");
2643 if ((src.is_constant() && src.as_constant() == 0) ||
2644 (src.is_register() && src.as_register() == G0)) {
2645 // do nothing
2646 } else if (dest.is_register()) {
2647 add(dest.as_register(), ensure_rs2(src, temp), dest.as_register());
2648 } else if (src.is_constant()) {
2649 intptr_t res = dest.as_constant() + src.as_constant();
2650 dest = RegisterOrConstant(res); // side effect seen by caller
2651 } else {
2652 assert(temp != noreg, "cannot handle constant += register");
2653 add(src.as_register(), ensure_rs2(dest, temp), temp);
2654 dest = RegisterOrConstant(temp); // side effect seen by caller
2655 }
2656 }
2658 void MacroAssembler::regcon_sll_ptr( RegisterOrConstant& dest, RegisterOrConstant src, Register temp ) {
2659 assert(dest.register_or_noreg() != G0, "lost side effect");
2660 if (!is_simm13(src.constant_or_zero()))
2661 src = (src.as_constant() & 0xFF);
2662 if ((src.is_constant() && src.as_constant() == 0) ||
2663 (src.is_register() && src.as_register() == G0)) {
2664 // do nothing
2665 } else if (dest.is_register()) {
2666 sll_ptr(dest.as_register(), src, dest.as_register());
2667 } else if (src.is_constant()) {
2668 intptr_t res = dest.as_constant() << src.as_constant();
2669 dest = RegisterOrConstant(res); // side effect seen by caller
2670 } else {
2671 assert(temp != noreg, "cannot handle constant <<= register");
2672 set(dest.as_constant(), temp);
2673 sll_ptr(temp, src, temp);
2674 dest = RegisterOrConstant(temp); // side effect seen by caller
2675 }
2676 }
2679 // Look up the method for a megamorphic invokeinterface call.
2680 // The target method is determined by <intf_klass, itable_index>.
2681 // The receiver klass is in recv_klass.
2682 // On success, the result will be in method_result, and execution falls through.
2683 // On failure, execution transfers to the given label.
2684 void MacroAssembler::lookup_interface_method(Register recv_klass,
2685 Register intf_klass,
2686 RegisterOrConstant itable_index,
2687 Register method_result,
2688 Register scan_temp,
2689 Register sethi_temp,
2690 Label& L_no_such_interface) {
2691 assert_different_registers(recv_klass, intf_klass, method_result, scan_temp);
2692 assert(itable_index.is_constant() || itable_index.as_register() == method_result,
2693 "caller must use same register for non-constant itable index as for method");
2695 // Compute start of first itableOffsetEntry (which is at the end of the vtable)
2696 int vtable_base = instanceKlass::vtable_start_offset() * wordSize;
2697 int scan_step = itableOffsetEntry::size() * wordSize;
2698 int vte_size = vtableEntry::size() * wordSize;
2700 lduw(recv_klass, instanceKlass::vtable_length_offset() * wordSize, scan_temp);
2701 // %%% We should store the aligned, prescaled offset in the klassoop.
2702 // Then the next several instructions would fold away.
2704 int round_to_unit = ((HeapWordsPerLong > 1) ? BytesPerLong : 0);
2705 int itb_offset = vtable_base;
2706 if (round_to_unit != 0) {
2707 // hoist first instruction of round_to(scan_temp, BytesPerLong):
2708 itb_offset += round_to_unit - wordSize;
2709 }
2710 int itb_scale = exact_log2(vtableEntry::size() * wordSize);
2711 sll(scan_temp, itb_scale, scan_temp);
2712 add(scan_temp, itb_offset, scan_temp);
2713 if (round_to_unit != 0) {
2714 // Round up to align_object_offset boundary
2715 // see code for instanceKlass::start_of_itable!
2716 // Was: round_to(scan_temp, BytesPerLong);
2717 // Hoisted: add(scan_temp, BytesPerLong-1, scan_temp);
2718 and3(scan_temp, -round_to_unit, scan_temp);
2719 }
2720 add(recv_klass, scan_temp, scan_temp);
2722 // Adjust recv_klass by scaled itable_index, so we can free itable_index.
2723 RegisterOrConstant itable_offset = itable_index;
2724 regcon_sll_ptr(itable_offset, exact_log2(itableMethodEntry::size() * wordSize));
2725 regcon_inc_ptr(itable_offset, itableMethodEntry::method_offset_in_bytes());
2726 add(recv_klass, ensure_rs2(itable_offset, sethi_temp), recv_klass);
2728 // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) {
2729 // if (scan->interface() == intf) {
2730 // result = (klass + scan->offset() + itable_index);
2731 // }
2732 // }
2733 Label search, found_method;
2735 for (int peel = 1; peel >= 0; peel--) {
2736 // %%%% Could load both offset and interface in one ldx, if they were
2737 // in the opposite order. This would save a load.
2738 ld_ptr(scan_temp, itableOffsetEntry::interface_offset_in_bytes(), method_result);
2740 // Check that this entry is non-null. A null entry means that
2741 // the receiver class doesn't implement the interface, and wasn't the
2742 // same as when the caller was compiled.
2743 bpr(Assembler::rc_z, false, Assembler::pn, method_result, L_no_such_interface);
2744 delayed()->cmp(method_result, intf_klass);
2746 if (peel) {
2747 brx(Assembler::equal, false, Assembler::pt, found_method);
2748 } else {
2749 brx(Assembler::notEqual, false, Assembler::pn, search);
2750 // (invert the test to fall through to found_method...)
2751 }
2752 delayed()->add(scan_temp, scan_step, scan_temp);
2754 if (!peel) break;
2756 bind(search);
2757 }
2759 bind(found_method);
2761 // Got a hit.
2762 int ito_offset = itableOffsetEntry::offset_offset_in_bytes();
2763 // scan_temp[-scan_step] points to the vtable offset we need
2764 ito_offset -= scan_step;
2765 lduw(scan_temp, ito_offset, scan_temp);
2766 ld_ptr(recv_klass, scan_temp, method_result);
2767 }
2770 void MacroAssembler::check_klass_subtype(Register sub_klass,
2771 Register super_klass,
2772 Register temp_reg,
2773 Register temp2_reg,
2774 Label& L_success) {
2775 Label L_failure, L_pop_to_failure;
2776 check_klass_subtype_fast_path(sub_klass, super_klass,
2777 temp_reg, temp2_reg,
2778 &L_success, &L_failure, NULL);
2779 Register sub_2 = sub_klass;
2780 Register sup_2 = super_klass;
2781 if (!sub_2->is_global()) sub_2 = L0;
2782 if (!sup_2->is_global()) sup_2 = L1;
2784 save_frame_and_mov(0, sub_klass, sub_2, super_klass, sup_2);
2785 check_klass_subtype_slow_path(sub_2, sup_2,
2786 L2, L3, L4, L5,
2787 NULL, &L_pop_to_failure);
2789 // on success:
2790 restore();
2791 ba(false, L_success);
2792 delayed()->nop();
2794 // on failure:
2795 bind(L_pop_to_failure);
2796 restore();
2797 bind(L_failure);
2798 }
2801 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass,
2802 Register super_klass,
2803 Register temp_reg,
2804 Register temp2_reg,
2805 Label* L_success,
2806 Label* L_failure,
2807 Label* L_slow_path,
2808 RegisterOrConstant super_check_offset,
2809 Register instanceof_hack) {
2810 int sc_offset = (klassOopDesc::header_size() * HeapWordSize +
2811 Klass::secondary_super_cache_offset_in_bytes());
2812 int sco_offset = (klassOopDesc::header_size() * HeapWordSize +
2813 Klass::super_check_offset_offset_in_bytes());
2815 bool must_load_sco = (super_check_offset.constant_or_zero() == -1);
2816 bool need_slow_path = (must_load_sco ||
2817 super_check_offset.constant_or_zero() == sco_offset);
2819 assert_different_registers(sub_klass, super_klass, temp_reg);
2820 if (super_check_offset.is_register()) {
2821 assert_different_registers(sub_klass, super_klass,
2822 super_check_offset.as_register());
2823 } else if (must_load_sco) {
2824 assert(temp2_reg != noreg, "supply either a temp or a register offset");
2825 }
2827 Label L_fallthrough;
2828 int label_nulls = 0;
2829 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
2830 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
2831 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; }
2832 assert(label_nulls <= 1 || instanceof_hack != noreg ||
2833 (L_slow_path == &L_fallthrough && label_nulls <= 2 && !need_slow_path),
2834 "at most one NULL in the batch, usually");
2836 // Support for the instanceof hack, which uses delay slots to
2837 // set a destination register to zero or one.
2838 bool do_bool_sets = (instanceof_hack != noreg);
2839 #define BOOL_SET(bool_value) \
2840 if (do_bool_sets && bool_value >= 0) \
2841 set(bool_value, instanceof_hack)
2842 #define DELAYED_BOOL_SET(bool_value) \
2843 if (do_bool_sets && bool_value >= 0) \
2844 delayed()->set(bool_value, instanceof_hack); \
2845 else delayed()->nop()
2846 // Hacked ba(), which may only be used just before L_fallthrough.
2847 #define FINAL_JUMP(label, bool_value) \
2848 if (&(label) == &L_fallthrough) { \
2849 BOOL_SET(bool_value); \
2850 } else { \
2851 ba((do_bool_sets && bool_value >= 0), label); \
2852 DELAYED_BOOL_SET(bool_value); \
2853 }
2855 // If the pointers are equal, we are done (e.g., String[] elements).
2856 // This self-check enables sharing of secondary supertype arrays among
2857 // non-primary types such as array-of-interface. Otherwise, each such
2858 // type would need its own customized SSA.
2859 // We move this check to the front of the fast path because many
2860 // type checks are in fact trivially successful in this manner,
2861 // so we get a nicely predicted branch right at the start of the check.
2862 cmp(super_klass, sub_klass);
2863 brx(Assembler::equal, do_bool_sets, Assembler::pn, *L_success);
2864 DELAYED_BOOL_SET(1);
2866 // Check the supertype display:
2867 if (must_load_sco) {
2868 // The super check offset is always positive...
2869 lduw(super_klass, sco_offset, temp2_reg);
2870 super_check_offset = RegisterOrConstant(temp2_reg);
2871 }
2872 ld_ptr(sub_klass, super_check_offset, temp_reg);
2873 cmp(super_klass, temp_reg);
2875 // This check has worked decisively for primary supers.
2876 // Secondary supers are sought in the super_cache ('super_cache_addr').
2877 // (Secondary supers are interfaces and very deeply nested subtypes.)
2878 // This works in the same check above because of a tricky aliasing
2879 // between the super_cache and the primary super display elements.
2880 // (The 'super_check_addr' can address either, as the case requires.)
2881 // Note that the cache is updated below if it does not help us find
2882 // what we need immediately.
2883 // So if it was a primary super, we can just fail immediately.
2884 // Otherwise, it's the slow path for us (no success at this point).
2886 if (super_check_offset.is_register()) {
2887 brx(Assembler::equal, do_bool_sets, Assembler::pn, *L_success);
2888 delayed(); if (do_bool_sets) BOOL_SET(1);
2889 // if !do_bool_sets, sneak the next cmp into the delay slot:
2890 cmp(super_check_offset.as_register(), sc_offset);
2892 if (L_failure == &L_fallthrough) {
2893 brx(Assembler::equal, do_bool_sets, Assembler::pt, *L_slow_path);
2894 delayed()->nop();
2895 BOOL_SET(0); // fallthrough on failure
2896 } else {
2897 brx(Assembler::notEqual, do_bool_sets, Assembler::pn, *L_failure);
2898 DELAYED_BOOL_SET(0);
2899 FINAL_JUMP(*L_slow_path, -1); // -1 => vanilla delay slot
2900 }
2901 } else if (super_check_offset.as_constant() == sc_offset) {
2902 // Need a slow path; fast failure is impossible.
2903 if (L_slow_path == &L_fallthrough) {
2904 brx(Assembler::equal, do_bool_sets, Assembler::pt, *L_success);
2905 DELAYED_BOOL_SET(1);
2906 } else {
2907 brx(Assembler::notEqual, false, Assembler::pn, *L_slow_path);
2908 delayed()->nop();
2909 FINAL_JUMP(*L_success, 1);
2910 }
2911 } else {
2912 // No slow path; it's a fast decision.
2913 if (L_failure == &L_fallthrough) {
2914 brx(Assembler::equal, do_bool_sets, Assembler::pt, *L_success);
2915 DELAYED_BOOL_SET(1);
2916 BOOL_SET(0);
2917 } else {
2918 brx(Assembler::notEqual, do_bool_sets, Assembler::pn, *L_failure);
2919 DELAYED_BOOL_SET(0);
2920 FINAL_JUMP(*L_success, 1);
2921 }
2922 }
2924 bind(L_fallthrough);
2926 #undef final_jump
2927 #undef bool_set
2928 #undef DELAYED_BOOL_SET
2929 #undef final_jump
2930 }
2933 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass,
2934 Register super_klass,
2935 Register count_temp,
2936 Register scan_temp,
2937 Register scratch_reg,
2938 Register coop_reg,
2939 Label* L_success,
2940 Label* L_failure) {
2941 assert_different_registers(sub_klass, super_klass,
2942 count_temp, scan_temp, scratch_reg, coop_reg);
2944 Label L_fallthrough, L_loop;
2945 int label_nulls = 0;
2946 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
2947 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
2948 assert(label_nulls <= 1, "at most one NULL in the batch");
2950 // a couple of useful fields in sub_klass:
2951 int ss_offset = (klassOopDesc::header_size() * HeapWordSize +
2952 Klass::secondary_supers_offset_in_bytes());
2953 int sc_offset = (klassOopDesc::header_size() * HeapWordSize +
2954 Klass::secondary_super_cache_offset_in_bytes());
2956 // Do a linear scan of the secondary super-klass chain.
2957 // This code is rarely used, so simplicity is a virtue here.
2959 #ifndef PRODUCT
2960 int* pst_counter = &SharedRuntime::_partial_subtype_ctr;
2961 inc_counter((address) pst_counter, count_temp, scan_temp);
2962 #endif
2964 // We will consult the secondary-super array.
2965 ld_ptr(sub_klass, ss_offset, scan_temp);
2967 // Compress superclass if necessary.
2968 Register search_key = super_klass;
2969 bool decode_super_klass = false;
2970 if (UseCompressedOops) {
2971 if (coop_reg != noreg) {
2972 encode_heap_oop_not_null(super_klass, coop_reg);
2973 search_key = coop_reg;
2974 } else {
2975 encode_heap_oop_not_null(super_klass);
2976 decode_super_klass = true; // scarce temps!
2977 }
2978 // The superclass is never null; it would be a basic system error if a null
2979 // pointer were to sneak in here. Note that we have already loaded the
2980 // Klass::super_check_offset from the super_klass in the fast path,
2981 // so if there is a null in that register, we are already in the afterlife.
2982 }
2984 // Load the array length. (Positive movl does right thing on LP64.)
2985 lduw(scan_temp, arrayOopDesc::length_offset_in_bytes(), count_temp);
2987 // Check for empty secondary super list
2988 tst(count_temp);
2990 // Top of search loop
2991 bind(L_loop);
2992 br(Assembler::equal, false, Assembler::pn, *L_failure);
2993 delayed()->add(scan_temp, heapOopSize, scan_temp);
2994 assert(heapOopSize != 0, "heapOopSize should be initialized");
2996 // Skip the array header in all array accesses.
2997 int elem_offset = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
2998 elem_offset -= heapOopSize; // the scan pointer was pre-incremented also
3000 // Load next super to check
3001 if (UseCompressedOops) {
3002 // Don't use load_heap_oop; we don't want to decode the element.
3003 lduw( scan_temp, elem_offset, scratch_reg );
3004 } else {
3005 ld_ptr( scan_temp, elem_offset, scratch_reg );
3006 }
3008 // Look for Rsuper_klass on Rsub_klass's secondary super-class-overflow list
3009 cmp(scratch_reg, search_key);
3011 // A miss means we are NOT a subtype and need to keep looping
3012 brx(Assembler::notEqual, false, Assembler::pn, L_loop);
3013 delayed()->deccc(count_temp); // decrement trip counter in delay slot
3015 // Falling out the bottom means we found a hit; we ARE a subtype
3016 if (decode_super_klass) decode_heap_oop(super_klass);
3018 // Success. Cache the super we found and proceed in triumph.
3019 st_ptr(super_klass, sub_klass, sc_offset);
3021 if (L_success != &L_fallthrough) {
3022 ba(false, *L_success);
3023 delayed()->nop();
3024 }
3026 bind(L_fallthrough);
3027 }
3032 void MacroAssembler::biased_locking_enter(Register obj_reg, Register mark_reg,
3033 Register temp_reg,
3034 Label& done, Label* slow_case,
3035 BiasedLockingCounters* counters) {
3036 assert(UseBiasedLocking, "why call this otherwise?");
3038 if (PrintBiasedLockingStatistics) {
3039 assert_different_registers(obj_reg, mark_reg, temp_reg, O7);
3040 if (counters == NULL)
3041 counters = BiasedLocking::counters();
3042 }
3044 Label cas_label;
3046 // Biased locking
3047 // See whether the lock is currently biased toward our thread and
3048 // whether the epoch is still valid
3049 // Note that the runtime guarantees sufficient alignment of JavaThread
3050 // pointers to allow age to be placed into low bits
3051 assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout");
3052 and3(mark_reg, markOopDesc::biased_lock_mask_in_place, temp_reg);
3053 cmp(temp_reg, markOopDesc::biased_lock_pattern);
3054 brx(Assembler::notEqual, false, Assembler::pn, cas_label);
3055 delayed()->nop();
3057 load_klass(obj_reg, temp_reg);
3058 ld_ptr(Address(temp_reg, 0, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes()), temp_reg);
3059 or3(G2_thread, temp_reg, temp_reg);
3060 xor3(mark_reg, temp_reg, temp_reg);
3061 andcc(temp_reg, ~((int) markOopDesc::age_mask_in_place), temp_reg);
3062 if (counters != NULL) {
3063 cond_inc(Assembler::equal, (address) counters->biased_lock_entry_count_addr(), mark_reg, temp_reg);
3064 // Reload mark_reg as we may need it later
3065 ld_ptr(Address(obj_reg, 0, oopDesc::mark_offset_in_bytes()), mark_reg);
3066 }
3067 brx(Assembler::equal, true, Assembler::pt, done);
3068 delayed()->nop();
3070 Label try_revoke_bias;
3071 Label try_rebias;
3072 Address mark_addr = Address(obj_reg, 0, oopDesc::mark_offset_in_bytes());
3073 assert(mark_addr.disp() == 0, "cas must take a zero displacement");
3075 // At this point we know that the header has the bias pattern and
3076 // that we are not the bias owner in the current epoch. We need to
3077 // figure out more details about the state of the header in order to
3078 // know what operations can be legally performed on the object's
3079 // header.
3081 // If the low three bits in the xor result aren't clear, that means
3082 // the prototype header is no longer biased and we have to revoke
3083 // the bias on this object.
3084 btst(markOopDesc::biased_lock_mask_in_place, temp_reg);
3085 brx(Assembler::notZero, false, Assembler::pn, try_revoke_bias);
3087 // Biasing is still enabled for this data type. See whether the
3088 // epoch of the current bias is still valid, meaning that the epoch
3089 // bits of the mark word are equal to the epoch bits of the
3090 // prototype header. (Note that the prototype header's epoch bits
3091 // only change at a safepoint.) If not, attempt to rebias the object
3092 // toward the current thread. Note that we must be absolutely sure
3093 // that the current epoch is invalid in order to do this because
3094 // otherwise the manipulations it performs on the mark word are
3095 // illegal.
3096 delayed()->btst(markOopDesc::epoch_mask_in_place, temp_reg);
3097 brx(Assembler::notZero, false, Assembler::pn, try_rebias);
3099 // The epoch of the current bias is still valid but we know nothing
3100 // about the owner; it might be set or it might be clear. Try to
3101 // acquire the bias of the object using an atomic operation. If this
3102 // fails we will go in to the runtime to revoke the object's bias.
3103 // Note that we first construct the presumed unbiased header so we
3104 // don't accidentally blow away another thread's valid bias.
3105 delayed()->and3(mark_reg,
3106 markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place,
3107 mark_reg);
3108 or3(G2_thread, mark_reg, temp_reg);
3109 casn(mark_addr.base(), mark_reg, temp_reg);
3110 // If the biasing toward our thread failed, this means that
3111 // another thread succeeded in biasing it toward itself and we
3112 // need to revoke that bias. The revocation will occur in the
3113 // interpreter runtime in the slow case.
3114 cmp(mark_reg, temp_reg);
3115 if (counters != NULL) {
3116 cond_inc(Assembler::zero, (address) counters->anonymously_biased_lock_entry_count_addr(), mark_reg, temp_reg);
3117 }
3118 if (slow_case != NULL) {
3119 brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
3120 delayed()->nop();
3121 }
3122 br(Assembler::always, false, Assembler::pt, done);
3123 delayed()->nop();
3125 bind(try_rebias);
3126 // At this point we know the epoch has expired, meaning that the
3127 // current "bias owner", if any, is actually invalid. Under these
3128 // circumstances _only_, we are allowed to use the current header's
3129 // value as the comparison value when doing the cas to acquire the
3130 // bias in the current epoch. In other words, we allow transfer of
3131 // the bias from one thread to another directly in this situation.
3132 //
3133 // FIXME: due to a lack of registers we currently blow away the age
3134 // bits in this situation. Should attempt to preserve them.
3135 load_klass(obj_reg, temp_reg);
3136 ld_ptr(Address(temp_reg, 0, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes()), temp_reg);
3137 or3(G2_thread, temp_reg, temp_reg);
3138 casn(mark_addr.base(), mark_reg, temp_reg);
3139 // If the biasing toward our thread failed, this means that
3140 // another thread succeeded in biasing it toward itself and we
3141 // need to revoke that bias. The revocation will occur in the
3142 // interpreter runtime in the slow case.
3143 cmp(mark_reg, temp_reg);
3144 if (counters != NULL) {
3145 cond_inc(Assembler::zero, (address) counters->rebiased_lock_entry_count_addr(), mark_reg, temp_reg);
3146 }
3147 if (slow_case != NULL) {
3148 brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
3149 delayed()->nop();
3150 }
3151 br(Assembler::always, false, Assembler::pt, done);
3152 delayed()->nop();
3154 bind(try_revoke_bias);
3155 // The prototype mark in the klass doesn't have the bias bit set any
3156 // more, indicating that objects of this data type are not supposed
3157 // to be biased any more. We are going to try to reset the mark of
3158 // this object to the prototype value and fall through to the
3159 // CAS-based locking scheme. Note that if our CAS fails, it means
3160 // that another thread raced us for the privilege of revoking the
3161 // bias of this particular object, so it's okay to continue in the
3162 // normal locking code.
3163 //
3164 // FIXME: due to a lack of registers we currently blow away the age
3165 // bits in this situation. Should attempt to preserve them.
3166 load_klass(obj_reg, temp_reg);
3167 ld_ptr(Address(temp_reg, 0, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes()), temp_reg);
3168 casn(mark_addr.base(), mark_reg, temp_reg);
3169 // Fall through to the normal CAS-based lock, because no matter what
3170 // the result of the above CAS, some thread must have succeeded in
3171 // removing the bias bit from the object's header.
3172 if (counters != NULL) {
3173 cmp(mark_reg, temp_reg);
3174 cond_inc(Assembler::zero, (address) counters->revoked_lock_entry_count_addr(), mark_reg, temp_reg);
3175 }
3177 bind(cas_label);
3178 }
3180 void MacroAssembler::biased_locking_exit (Address mark_addr, Register temp_reg, Label& done,
3181 bool allow_delay_slot_filling) {
3182 // Check for biased locking unlock case, which is a no-op
3183 // Note: we do not have to check the thread ID for two reasons.
3184 // First, the interpreter checks for IllegalMonitorStateException at
3185 // a higher level. Second, if the bias was revoked while we held the
3186 // lock, the object could not be rebiased toward another thread, so
3187 // the bias bit would be clear.
3188 ld_ptr(mark_addr, temp_reg);
3189 and3(temp_reg, markOopDesc::biased_lock_mask_in_place, temp_reg);
3190 cmp(temp_reg, markOopDesc::biased_lock_pattern);
3191 brx(Assembler::equal, allow_delay_slot_filling, Assembler::pt, done);
3192 delayed();
3193 if (!allow_delay_slot_filling) {
3194 nop();
3195 }
3196 }
3199 // CASN -- 32-64 bit switch hitter similar to the synthetic CASN provided by
3200 // Solaris/SPARC's "as". Another apt name would be cas_ptr()
3202 void MacroAssembler::casn (Register addr_reg, Register cmp_reg, Register set_reg ) {
3203 casx_under_lock (addr_reg, cmp_reg, set_reg, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr()) ;
3204 }
3208 // compiler_lock_object() and compiler_unlock_object() are direct transliterations
3209 // of i486.ad fast_lock() and fast_unlock(). See those methods for detailed comments.
3210 // The code could be tightened up considerably.
3211 //
3212 // box->dhw disposition - post-conditions at DONE_LABEL.
3213 // - Successful inflated lock: box->dhw != 0.
3214 // Any non-zero value suffices.
3215 // Consider G2_thread, rsp, boxReg, or unused_mark()
3216 // - Successful Stack-lock: box->dhw == mark.
3217 // box->dhw must contain the displaced mark word value
3218 // - Failure -- icc.ZFlag == 0 and box->dhw is undefined.
3219 // The slow-path fast_enter() and slow_enter() operators
3220 // are responsible for setting box->dhw = NonZero (typically ::unused_mark).
3221 // - Biased: box->dhw is undefined
3222 //
3223 // SPARC refworkload performance - specifically jetstream and scimark - are
3224 // extremely sensitive to the size of the code emitted by compiler_lock_object
3225 // and compiler_unlock_object. Critically, the key factor is code size, not path
3226 // length. (Simply experiments to pad CLO with unexecuted NOPs demonstrte the
3227 // effect).
3230 void MacroAssembler::compiler_lock_object(Register Roop, Register Rmark,
3231 Register Rbox, Register Rscratch,
3232 BiasedLockingCounters* counters,
3233 bool try_bias) {
3234 Address mark_addr(Roop, 0, oopDesc::mark_offset_in_bytes());
3236 verify_oop(Roop);
3237 Label done ;
3239 if (counters != NULL) {
3240 inc_counter((address) counters->total_entry_count_addr(), Rmark, Rscratch);
3241 }
3243 if (EmitSync & 1) {
3244 mov (3, Rscratch) ;
3245 st_ptr (Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
3246 cmp (SP, G0) ;
3247 return ;
3248 }
3250 if (EmitSync & 2) {
3252 // Fetch object's markword
3253 ld_ptr(mark_addr, Rmark);
3255 if (try_bias) {
3256 biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
3257 }
3259 // Save Rbox in Rscratch to be used for the cas operation
3260 mov(Rbox, Rscratch);
3262 // set Rmark to markOop | markOopDesc::unlocked_value
3263 or3(Rmark, markOopDesc::unlocked_value, Rmark);
3265 // Initialize the box. (Must happen before we update the object mark!)
3266 st_ptr(Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
3268 // compare object markOop with Rmark and if equal exchange Rscratch with object markOop
3269 assert(mark_addr.disp() == 0, "cas must take a zero displacement");
3270 casx_under_lock(mark_addr.base(), Rmark, Rscratch,
3271 (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
3273 // if compare/exchange succeeded we found an unlocked object and we now have locked it
3274 // hence we are done
3275 cmp(Rmark, Rscratch);
3276 #ifdef _LP64
3277 sub(Rscratch, STACK_BIAS, Rscratch);
3278 #endif
3279 brx(Assembler::equal, false, Assembler::pt, done);
3280 delayed()->sub(Rscratch, SP, Rscratch); //pull next instruction into delay slot
3282 // we did not find an unlocked object so see if this is a recursive case
3283 // sub(Rscratch, SP, Rscratch);
3284 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
3285 andcc(Rscratch, 0xfffff003, Rscratch);
3286 st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
3287 bind (done) ;
3288 return ;
3289 }
3291 Label Egress ;
3293 if (EmitSync & 256) {
3294 Label IsInflated ;
3296 ld_ptr (mark_addr, Rmark); // fetch obj->mark
3297 // Triage: biased, stack-locked, neutral, inflated
3298 if (try_bias) {
3299 biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
3300 // Invariant: if control reaches this point in the emitted stream
3301 // then Rmark has not been modified.
3302 }
3304 // Store mark into displaced mark field in the on-stack basic-lock "box"
3305 // Critically, this must happen before the CAS
3306 // Maximize the ST-CAS distance to minimize the ST-before-CAS penalty.
3307 st_ptr (Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
3308 andcc (Rmark, 2, G0) ;
3309 brx (Assembler::notZero, false, Assembler::pn, IsInflated) ;
3310 delayed() ->
3312 // Try stack-lock acquisition.
3313 // Beware: the 1st instruction is in a delay slot
3314 mov (Rbox, Rscratch);
3315 or3 (Rmark, markOopDesc::unlocked_value, Rmark);
3316 assert (mark_addr.disp() == 0, "cas must take a zero displacement");
3317 casn (mark_addr.base(), Rmark, Rscratch) ;
3318 cmp (Rmark, Rscratch);
3319 brx (Assembler::equal, false, Assembler::pt, done);
3320 delayed()->sub(Rscratch, SP, Rscratch);
3322 // Stack-lock attempt failed - check for recursive stack-lock.
3323 // See the comments below about how we might remove this case.
3324 #ifdef _LP64
3325 sub (Rscratch, STACK_BIAS, Rscratch);
3326 #endif
3327 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
3328 andcc (Rscratch, 0xfffff003, Rscratch);
3329 br (Assembler::always, false, Assembler::pt, done) ;
3330 delayed()-> st_ptr (Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
3332 bind (IsInflated) ;
3333 if (EmitSync & 64) {
3334 // If m->owner != null goto IsLocked
3335 // Pessimistic form: Test-and-CAS vs CAS
3336 // The optimistic form avoids RTS->RTO cache line upgrades.
3337 ld_ptr (Address (Rmark, 0, ObjectMonitor::owner_offset_in_bytes()-2), Rscratch) ;
3338 andcc (Rscratch, Rscratch, G0) ;
3339 brx (Assembler::notZero, false, Assembler::pn, done) ;
3340 delayed()->nop() ;
3341 // m->owner == null : it's unlocked.
3342 }
3344 // Try to CAS m->owner from null to Self
3345 // Invariant: if we acquire the lock then _recursions should be 0.
3346 add (Rmark, ObjectMonitor::owner_offset_in_bytes()-2, Rmark) ;
3347 mov (G2_thread, Rscratch) ;
3348 casn (Rmark, G0, Rscratch) ;
3349 cmp (Rscratch, G0) ;
3350 // Intentional fall-through into done
3351 } else {
3352 // Aggressively avoid the Store-before-CAS penalty
3353 // Defer the store into box->dhw until after the CAS
3354 Label IsInflated, Recursive ;
3356 // Anticipate CAS -- Avoid RTS->RTO upgrade
3357 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads) ;
3359 ld_ptr (mark_addr, Rmark); // fetch obj->mark
3360 // Triage: biased, stack-locked, neutral, inflated
3362 if (try_bias) {
3363 biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
3364 // Invariant: if control reaches this point in the emitted stream
3365 // then Rmark has not been modified.
3366 }
3367 andcc (Rmark, 2, G0) ;
3368 brx (Assembler::notZero, false, Assembler::pn, IsInflated) ;
3369 delayed()-> // Beware - dangling delay-slot
3371 // Try stack-lock acquisition.
3372 // Transiently install BUSY (0) encoding in the mark word.
3373 // if the CAS of 0 into the mark was successful then we execute:
3374 // ST box->dhw = mark -- save fetched mark in on-stack basiclock box
3375 // ST obj->mark = box -- overwrite transient 0 value
3376 // This presumes TSO, of course.
3378 mov (0, Rscratch) ;
3379 or3 (Rmark, markOopDesc::unlocked_value, Rmark);
3380 assert (mark_addr.disp() == 0, "cas must take a zero displacement");
3381 casn (mark_addr.base(), Rmark, Rscratch) ;
3382 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads) ;
3383 cmp (Rscratch, Rmark) ;
3384 brx (Assembler::notZero, false, Assembler::pn, Recursive) ;
3385 delayed() ->
3386 st_ptr (Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
3387 if (counters != NULL) {
3388 cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
3389 }
3390 br (Assembler::always, false, Assembler::pt, done);
3391 delayed() ->
3392 st_ptr (Rbox, mark_addr) ;
3394 bind (Recursive) ;
3395 // Stack-lock attempt failed - check for recursive stack-lock.
3396 // Tests show that we can remove the recursive case with no impact
3397 // on refworkload 0.83. If we need to reduce the size of the code
3398 // emitted by compiler_lock_object() the recursive case is perfect
3399 // candidate.
3400 //
3401 // A more extreme idea is to always inflate on stack-lock recursion.
3402 // This lets us eliminate the recursive checks in compiler_lock_object
3403 // and compiler_unlock_object and the (box->dhw == 0) encoding.
3404 // A brief experiment - requiring changes to synchronizer.cpp, interpreter,
3405 // and showed a performance *increase*. In the same experiment I eliminated
3406 // the fast-path stack-lock code from the interpreter and always passed
3407 // control to the "slow" operators in synchronizer.cpp.
3409 // RScratch contains the fetched obj->mark value from the failed CASN.
3410 #ifdef _LP64
3411 sub (Rscratch, STACK_BIAS, Rscratch);
3412 #endif
3413 sub(Rscratch, SP, Rscratch);
3414 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
3415 andcc (Rscratch, 0xfffff003, Rscratch);
3416 if (counters != NULL) {
3417 // Accounting needs the Rscratch register
3418 st_ptr (Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
3419 cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
3420 br (Assembler::always, false, Assembler::pt, done) ;
3421 delayed()->nop() ;
3422 } else {
3423 br (Assembler::always, false, Assembler::pt, done) ;
3424 delayed()-> st_ptr (Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
3425 }
3427 bind (IsInflated) ;
3428 if (EmitSync & 64) {
3429 // If m->owner != null goto IsLocked
3430 // Test-and-CAS vs CAS
3431 // Pessimistic form avoids futile (doomed) CAS attempts
3432 // The optimistic form avoids RTS->RTO cache line upgrades.
3433 ld_ptr (Address (Rmark, 0, ObjectMonitor::owner_offset_in_bytes()-2), Rscratch) ;
3434 andcc (Rscratch, Rscratch, G0) ;
3435 brx (Assembler::notZero, false, Assembler::pn, done) ;
3436 delayed()->nop() ;
3437 // m->owner == null : it's unlocked.
3438 }
3440 // Try to CAS m->owner from null to Self
3441 // Invariant: if we acquire the lock then _recursions should be 0.
3442 add (Rmark, ObjectMonitor::owner_offset_in_bytes()-2, Rmark) ;
3443 mov (G2_thread, Rscratch) ;
3444 casn (Rmark, G0, Rscratch) ;
3445 cmp (Rscratch, G0) ;
3446 // ST box->displaced_header = NonZero.
3447 // Any non-zero value suffices:
3448 // unused_mark(), G2_thread, RBox, RScratch, rsp, etc.
3449 st_ptr (Rbox, Rbox, BasicLock::displaced_header_offset_in_bytes());
3450 // Intentional fall-through into done
3451 }
3453 bind (done) ;
3454 }
3456 void MacroAssembler::compiler_unlock_object(Register Roop, Register Rmark,
3457 Register Rbox, Register Rscratch,
3458 bool try_bias) {
3459 Address mark_addr(Roop, 0, oopDesc::mark_offset_in_bytes());
3461 Label done ;
3463 if (EmitSync & 4) {
3464 cmp (SP, G0) ;
3465 return ;
3466 }
3468 if (EmitSync & 8) {
3469 if (try_bias) {
3470 biased_locking_exit(mark_addr, Rscratch, done);
3471 }
3473 // Test first if it is a fast recursive unlock
3474 ld_ptr(Rbox, BasicLock::displaced_header_offset_in_bytes(), Rmark);
3475 cmp(Rmark, G0);
3476 brx(Assembler::equal, false, Assembler::pt, done);
3477 delayed()->nop();
3479 // Check if it is still a light weight lock, this is is true if we see
3480 // the stack address of the basicLock in the markOop of the object
3481 assert(mark_addr.disp() == 0, "cas must take a zero displacement");
3482 casx_under_lock(mark_addr.base(), Rbox, Rmark,
3483 (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
3484 br (Assembler::always, false, Assembler::pt, done);
3485 delayed()->cmp(Rbox, Rmark);
3486 bind (done) ;
3487 return ;
3488 }
3490 // Beware ... If the aggregate size of the code emitted by CLO and CUO is
3491 // is too large performance rolls abruptly off a cliff.
3492 // This could be related to inlining policies, code cache management, or
3493 // I$ effects.
3494 Label LStacked ;
3496 if (try_bias) {
3497 // TODO: eliminate redundant LDs of obj->mark
3498 biased_locking_exit(mark_addr, Rscratch, done);
3499 }
3501 ld_ptr (Roop, oopDesc::mark_offset_in_bytes(), Rmark) ;
3502 ld_ptr (Rbox, BasicLock::displaced_header_offset_in_bytes(), Rscratch);
3503 andcc (Rscratch, Rscratch, G0);
3504 brx (Assembler::zero, false, Assembler::pn, done);
3505 delayed()-> nop() ; // consider: relocate fetch of mark, above, into this DS
3506 andcc (Rmark, 2, G0) ;
3507 brx (Assembler::zero, false, Assembler::pt, LStacked) ;
3508 delayed()-> nop() ;
3510 // It's inflated
3511 // Conceptually we need a #loadstore|#storestore "release" MEMBAR before
3512 // the ST of 0 into _owner which releases the lock. This prevents loads
3513 // and stores within the critical section from reordering (floating)
3514 // past the store that releases the lock. But TSO is a strong memory model
3515 // and that particular flavor of barrier is a noop, so we can safely elide it.
3516 // Note that we use 1-0 locking by default for the inflated case. We
3517 // close the resultant (and rare) race by having contented threads in
3518 // monitorenter periodically poll _owner.
3519 ld_ptr (Address(Rmark, 0, ObjectMonitor::owner_offset_in_bytes()-2), Rscratch) ;
3520 ld_ptr (Address(Rmark, 0, ObjectMonitor::recursions_offset_in_bytes()-2), Rbox) ;
3521 xor3 (Rscratch, G2_thread, Rscratch) ;
3522 orcc (Rbox, Rscratch, Rbox) ;
3523 brx (Assembler::notZero, false, Assembler::pn, done) ;
3524 delayed()->
3525 ld_ptr (Address (Rmark, 0, ObjectMonitor::EntryList_offset_in_bytes()-2), Rscratch) ;
3526 ld_ptr (Address (Rmark, 0, ObjectMonitor::cxq_offset_in_bytes()-2), Rbox) ;
3527 orcc (Rbox, Rscratch, G0) ;
3528 if (EmitSync & 65536) {
3529 Label LSucc ;
3530 brx (Assembler::notZero, false, Assembler::pn, LSucc) ;
3531 delayed()->nop() ;
3532 br (Assembler::always, false, Assembler::pt, done) ;
3533 delayed()->
3534 st_ptr (G0, Address (Rmark, 0, ObjectMonitor::owner_offset_in_bytes()-2)) ;
3536 bind (LSucc) ;
3537 st_ptr (G0, Address (Rmark, 0, ObjectMonitor::owner_offset_in_bytes()-2)) ;
3538 if (os::is_MP()) { membar (StoreLoad) ; }
3539 ld_ptr (Address (Rmark, 0, ObjectMonitor::succ_offset_in_bytes()-2), Rscratch) ;
3540 andcc (Rscratch, Rscratch, G0) ;
3541 brx (Assembler::notZero, false, Assembler::pt, done) ;
3542 delayed()-> andcc (G0, G0, G0) ;
3543 add (Rmark, ObjectMonitor::owner_offset_in_bytes()-2, Rmark) ;
3544 mov (G2_thread, Rscratch) ;
3545 casn (Rmark, G0, Rscratch) ;
3546 cmp (Rscratch, G0) ;
3547 // invert icc.zf and goto done
3548 brx (Assembler::notZero, false, Assembler::pt, done) ;
3549 delayed() -> cmp (G0, G0) ;
3550 br (Assembler::always, false, Assembler::pt, done);
3551 delayed() -> cmp (G0, 1) ;
3552 } else {
3553 brx (Assembler::notZero, false, Assembler::pn, done) ;
3554 delayed()->nop() ;
3555 br (Assembler::always, false, Assembler::pt, done) ;
3556 delayed()->
3557 st_ptr (G0, Address (Rmark, 0, ObjectMonitor::owner_offset_in_bytes()-2)) ;
3558 }
3560 bind (LStacked) ;
3561 // Consider: we could replace the expensive CAS in the exit
3562 // path with a simple ST of the displaced mark value fetched from
3563 // the on-stack basiclock box. That admits a race where a thread T2
3564 // in the slow lock path -- inflating with monitor M -- could race a
3565 // thread T1 in the fast unlock path, resulting in a missed wakeup for T2.
3566 // More precisely T1 in the stack-lock unlock path could "stomp" the
3567 // inflated mark value M installed by T2, resulting in an orphan
3568 // object monitor M and T2 becoming stranded. We can remedy that situation
3569 // by having T2 periodically poll the object's mark word using timed wait
3570 // operations. If T2 discovers that a stomp has occurred it vacates
3571 // the monitor M and wakes any other threads stranded on the now-orphan M.
3572 // In addition the monitor scavenger, which performs deflation,
3573 // would also need to check for orpan monitors and stranded threads.
3574 //
3575 // Finally, inflation is also used when T2 needs to assign a hashCode
3576 // to O and O is stack-locked by T1. The "stomp" race could cause
3577 // an assigned hashCode value to be lost. We can avoid that condition
3578 // and provide the necessary hashCode stability invariants by ensuring
3579 // that hashCode generation is idempotent between copying GCs.
3580 // For example we could compute the hashCode of an object O as
3581 // O's heap address XOR some high quality RNG value that is refreshed
3582 // at GC-time. The monitor scavenger would install the hashCode
3583 // found in any orphan monitors. Again, the mechanism admits a
3584 // lost-update "stomp" WAW race but detects and recovers as needed.
3585 //
3586 // A prototype implementation showed excellent results, although
3587 // the scavenger and timeout code was rather involved.
3589 casn (mark_addr.base(), Rbox, Rscratch) ;
3590 cmp (Rbox, Rscratch);
3591 // Intentional fall through into done ...
3593 bind (done) ;
3594 }
3598 void MacroAssembler::print_CPU_state() {
3599 // %%%%% need to implement this
3600 }
3602 void MacroAssembler::verify_FPU(int stack_depth, const char* s) {
3603 // %%%%% need to implement this
3604 }
3606 void MacroAssembler::push_IU_state() {
3607 // %%%%% need to implement this
3608 }
3611 void MacroAssembler::pop_IU_state() {
3612 // %%%%% need to implement this
3613 }
3616 void MacroAssembler::push_FPU_state() {
3617 // %%%%% need to implement this
3618 }
3621 void MacroAssembler::pop_FPU_state() {
3622 // %%%%% need to implement this
3623 }
3626 void MacroAssembler::push_CPU_state() {
3627 // %%%%% need to implement this
3628 }
3631 void MacroAssembler::pop_CPU_state() {
3632 // %%%%% need to implement this
3633 }
3637 void MacroAssembler::verify_tlab() {
3638 #ifdef ASSERT
3639 if (UseTLAB && VerifyOops) {
3640 Label next, next2, ok;
3641 Register t1 = L0;
3642 Register t2 = L1;
3643 Register t3 = L2;
3645 save_frame(0);
3646 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
3647 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_start_offset()), t2);
3648 or3(t1, t2, t3);
3649 cmp(t1, t2);
3650 br(Assembler::greaterEqual, false, Assembler::pn, next);
3651 delayed()->nop();
3652 stop("assert(top >= start)");
3653 should_not_reach_here();
3655 bind(next);
3656 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
3657 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), t2);
3658 or3(t3, t2, t3);
3659 cmp(t1, t2);
3660 br(Assembler::lessEqual, false, Assembler::pn, next2);
3661 delayed()->nop();
3662 stop("assert(top <= end)");
3663 should_not_reach_here();
3665 bind(next2);
3666 and3(t3, MinObjAlignmentInBytesMask, t3);
3667 cmp(t3, 0);
3668 br(Assembler::lessEqual, false, Assembler::pn, ok);
3669 delayed()->nop();
3670 stop("assert(aligned)");
3671 should_not_reach_here();
3673 bind(ok);
3674 restore();
3675 }
3676 #endif
3677 }
3680 void MacroAssembler::eden_allocate(
3681 Register obj, // result: pointer to object after successful allocation
3682 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise
3683 int con_size_in_bytes, // object size in bytes if known at compile time
3684 Register t1, // temp register
3685 Register t2, // temp register
3686 Label& slow_case // continuation point if fast allocation fails
3687 ){
3688 // make sure arguments make sense
3689 assert_different_registers(obj, var_size_in_bytes, t1, t2);
3690 assert(0 <= con_size_in_bytes && Assembler::is_simm13(con_size_in_bytes), "illegal object size");
3691 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
3693 if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
3694 // No allocation in the shared eden.
3695 br(Assembler::always, false, Assembler::pt, slow_case);
3696 delayed()->nop();
3697 } else {
3698 // get eden boundaries
3699 // note: we need both top & top_addr!
3700 const Register top_addr = t1;
3701 const Register end = t2;
3703 CollectedHeap* ch = Universe::heap();
3704 set((intx)ch->top_addr(), top_addr);
3705 intx delta = (intx)ch->end_addr() - (intx)ch->top_addr();
3706 ld_ptr(top_addr, delta, end);
3707 ld_ptr(top_addr, 0, obj);
3709 // try to allocate
3710 Label retry;
3711 bind(retry);
3712 #ifdef ASSERT
3713 // make sure eden top is properly aligned
3714 {
3715 Label L;
3716 btst(MinObjAlignmentInBytesMask, obj);
3717 br(Assembler::zero, false, Assembler::pt, L);
3718 delayed()->nop();
3719 stop("eden top is not properly aligned");
3720 bind(L);
3721 }
3722 #endif // ASSERT
3723 const Register free = end;
3724 sub(end, obj, free); // compute amount of free space
3725 if (var_size_in_bytes->is_valid()) {
3726 // size is unknown at compile time
3727 cmp(free, var_size_in_bytes);
3728 br(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
3729 delayed()->add(obj, var_size_in_bytes, end);
3730 } else {
3731 // size is known at compile time
3732 cmp(free, con_size_in_bytes);
3733 br(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
3734 delayed()->add(obj, con_size_in_bytes, end);
3735 }
3736 // Compare obj with the value at top_addr; if still equal, swap the value of
3737 // end with the value at top_addr. If not equal, read the value at top_addr
3738 // into end.
3739 casx_under_lock(top_addr, obj, end, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
3740 // if someone beat us on the allocation, try again, otherwise continue
3741 cmp(obj, end);
3742 brx(Assembler::notEqual, false, Assembler::pn, retry);
3743 delayed()->mov(end, obj); // nop if successfull since obj == end
3745 #ifdef ASSERT
3746 // make sure eden top is properly aligned
3747 {
3748 Label L;
3749 const Register top_addr = t1;
3751 set((intx)ch->top_addr(), top_addr);
3752 ld_ptr(top_addr, 0, top_addr);
3753 btst(MinObjAlignmentInBytesMask, top_addr);
3754 br(Assembler::zero, false, Assembler::pt, L);
3755 delayed()->nop();
3756 stop("eden top is not properly aligned");
3757 bind(L);
3758 }
3759 #endif // ASSERT
3760 }
3761 }
3764 void MacroAssembler::tlab_allocate(
3765 Register obj, // result: pointer to object after successful allocation
3766 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise
3767 int con_size_in_bytes, // object size in bytes if known at compile time
3768 Register t1, // temp register
3769 Label& slow_case // continuation point if fast allocation fails
3770 ){
3771 // make sure arguments make sense
3772 assert_different_registers(obj, var_size_in_bytes, t1);
3773 assert(0 <= con_size_in_bytes && is_simm13(con_size_in_bytes), "illegal object size");
3774 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
3776 const Register free = t1;
3778 verify_tlab();
3780 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), obj);
3782 // calculate amount of free space
3783 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), free);
3784 sub(free, obj, free);
3786 Label done;
3787 if (var_size_in_bytes == noreg) {
3788 cmp(free, con_size_in_bytes);
3789 } else {
3790 cmp(free, var_size_in_bytes);
3791 }
3792 br(Assembler::less, false, Assembler::pn, slow_case);
3793 // calculate the new top pointer
3794 if (var_size_in_bytes == noreg) {
3795 delayed()->add(obj, con_size_in_bytes, free);
3796 } else {
3797 delayed()->add(obj, var_size_in_bytes, free);
3798 }
3800 bind(done);
3802 #ifdef ASSERT
3803 // make sure new free pointer is properly aligned
3804 {
3805 Label L;
3806 btst(MinObjAlignmentInBytesMask, free);
3807 br(Assembler::zero, false, Assembler::pt, L);
3808 delayed()->nop();
3809 stop("updated TLAB free is not properly aligned");
3810 bind(L);
3811 }
3812 #endif // ASSERT
3814 // update the tlab top pointer
3815 st_ptr(free, G2_thread, in_bytes(JavaThread::tlab_top_offset()));
3816 verify_tlab();
3817 }
3820 void MacroAssembler::tlab_refill(Label& retry, Label& try_eden, Label& slow_case) {
3821 Register top = O0;
3822 Register t1 = G1;
3823 Register t2 = G3;
3824 Register t3 = O1;
3825 assert_different_registers(top, t1, t2, t3, G4, G5 /* preserve G4 and G5 */);
3826 Label do_refill, discard_tlab;
3828 if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
3829 // No allocation in the shared eden.
3830 br(Assembler::always, false, Assembler::pt, slow_case);
3831 delayed()->nop();
3832 }
3834 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), top);
3835 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), t1);
3836 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()), t2);
3838 // calculate amount of free space
3839 sub(t1, top, t1);
3840 srl_ptr(t1, LogHeapWordSize, t1);
3842 // Retain tlab and allocate object in shared space if
3843 // the amount free in the tlab is too large to discard.
3844 cmp(t1, t2);
3845 brx(Assembler::lessEqual, false, Assembler::pt, discard_tlab);
3847 // increment waste limit to prevent getting stuck on this slow path
3848 delayed()->add(t2, ThreadLocalAllocBuffer::refill_waste_limit_increment(), t2);
3849 st_ptr(t2, G2_thread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()));
3850 if (TLABStats) {
3851 // increment number of slow_allocations
3852 ld(G2_thread, in_bytes(JavaThread::tlab_slow_allocations_offset()), t2);
3853 add(t2, 1, t2);
3854 stw(t2, G2_thread, in_bytes(JavaThread::tlab_slow_allocations_offset()));
3855 }
3856 br(Assembler::always, false, Assembler::pt, try_eden);
3857 delayed()->nop();
3859 bind(discard_tlab);
3860 if (TLABStats) {
3861 // increment number of refills
3862 ld(G2_thread, in_bytes(JavaThread::tlab_number_of_refills_offset()), t2);
3863 add(t2, 1, t2);
3864 stw(t2, G2_thread, in_bytes(JavaThread::tlab_number_of_refills_offset()));
3865 // accumulate wastage
3866 ld(G2_thread, in_bytes(JavaThread::tlab_fast_refill_waste_offset()), t2);
3867 add(t2, t1, t2);
3868 stw(t2, G2_thread, in_bytes(JavaThread::tlab_fast_refill_waste_offset()));
3869 }
3871 // if tlab is currently allocated (top or end != null) then
3872 // fill [top, end + alignment_reserve) with array object
3873 br_null(top, false, Assembler::pn, do_refill);
3874 delayed()->nop();
3876 set((intptr_t)markOopDesc::prototype()->copy_set_hash(0x2), t2);
3877 st_ptr(t2, top, oopDesc::mark_offset_in_bytes()); // set up the mark word
3878 // set klass to intArrayKlass
3879 sub(t1, typeArrayOopDesc::header_size(T_INT), t1);
3880 add(t1, ThreadLocalAllocBuffer::alignment_reserve(), t1);
3881 sll_ptr(t1, log2_intptr(HeapWordSize/sizeof(jint)), t1);
3882 st(t1, top, arrayOopDesc::length_offset_in_bytes());
3883 set((intptr_t)Universe::intArrayKlassObj_addr(), t2);
3884 ld_ptr(t2, 0, t2);
3885 // store klass last. concurrent gcs assumes klass length is valid if
3886 // klass field is not null.
3887 store_klass(t2, top);
3888 verify_oop(top);
3890 // refill the tlab with an eden allocation
3891 bind(do_refill);
3892 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_size_offset()), t1);
3893 sll_ptr(t1, LogHeapWordSize, t1);
3894 // add object_size ??
3895 eden_allocate(top, t1, 0, t2, t3, slow_case);
3897 st_ptr(top, G2_thread, in_bytes(JavaThread::tlab_start_offset()));
3898 st_ptr(top, G2_thread, in_bytes(JavaThread::tlab_top_offset()));
3899 #ifdef ASSERT
3900 // check that tlab_size (t1) is still valid
3901 {
3902 Label ok;
3903 ld_ptr(G2_thread, in_bytes(JavaThread::tlab_size_offset()), t2);
3904 sll_ptr(t2, LogHeapWordSize, t2);
3905 cmp(t1, t2);
3906 br(Assembler::equal, false, Assembler::pt, ok);
3907 delayed()->nop();
3908 stop("assert(t1 == tlab_size)");
3909 should_not_reach_here();
3911 bind(ok);
3912 }
3913 #endif // ASSERT
3914 add(top, t1, top); // t1 is tlab_size
3915 sub(top, ThreadLocalAllocBuffer::alignment_reserve_in_bytes(), top);
3916 st_ptr(top, G2_thread, in_bytes(JavaThread::tlab_end_offset()));
3917 verify_tlab();
3918 br(Assembler::always, false, Assembler::pt, retry);
3919 delayed()->nop();
3920 }
3922 Assembler::Condition MacroAssembler::negate_condition(Assembler::Condition cond) {
3923 switch (cond) {
3924 // Note some conditions are synonyms for others
3925 case Assembler::never: return Assembler::always;
3926 case Assembler::zero: return Assembler::notZero;
3927 case Assembler::lessEqual: return Assembler::greater;
3928 case Assembler::less: return Assembler::greaterEqual;
3929 case Assembler::lessEqualUnsigned: return Assembler::greaterUnsigned;
3930 case Assembler::lessUnsigned: return Assembler::greaterEqualUnsigned;
3931 case Assembler::negative: return Assembler::positive;
3932 case Assembler::overflowSet: return Assembler::overflowClear;
3933 case Assembler::always: return Assembler::never;
3934 case Assembler::notZero: return Assembler::zero;
3935 case Assembler::greater: return Assembler::lessEqual;
3936 case Assembler::greaterEqual: return Assembler::less;
3937 case Assembler::greaterUnsigned: return Assembler::lessEqualUnsigned;
3938 case Assembler::greaterEqualUnsigned: return Assembler::lessUnsigned;
3939 case Assembler::positive: return Assembler::negative;
3940 case Assembler::overflowClear: return Assembler::overflowSet;
3941 }
3943 ShouldNotReachHere(); return Assembler::overflowClear;
3944 }
3946 void MacroAssembler::cond_inc(Assembler::Condition cond, address counter_ptr,
3947 Register Rtmp1, Register Rtmp2 /*, Register Rtmp3, Register Rtmp4 */) {
3948 Condition negated_cond = negate_condition(cond);
3949 Label L;
3950 brx(negated_cond, false, Assembler::pt, L);
3951 delayed()->nop();
3952 inc_counter(counter_ptr, Rtmp1, Rtmp2);
3953 bind(L);
3954 }
3956 void MacroAssembler::inc_counter(address counter_ptr, Register Rtmp1, Register Rtmp2) {
3957 Address counter_addr(Rtmp1, counter_ptr);
3958 load_contents(counter_addr, Rtmp2);
3959 inc(Rtmp2);
3960 store_contents(Rtmp2, counter_addr);
3961 }
3963 SkipIfEqual::SkipIfEqual(
3964 MacroAssembler* masm, Register temp, const bool* flag_addr,
3965 Assembler::Condition condition) {
3966 _masm = masm;
3967 Address flag(temp, (address)flag_addr, relocInfo::none);
3968 _masm->sethi(flag);
3969 _masm->ldub(flag, temp);
3970 _masm->tst(temp);
3971 _masm->br(condition, false, Assembler::pt, _label);
3972 _masm->delayed()->nop();
3973 }
3975 SkipIfEqual::~SkipIfEqual() {
3976 _masm->bind(_label);
3977 }
3980 // Writes to stack successive pages until offset reached to check for
3981 // stack overflow + shadow pages. This clobbers tsp and scratch.
3982 void MacroAssembler::bang_stack_size(Register Rsize, Register Rtsp,
3983 Register Rscratch) {
3984 // Use stack pointer in temp stack pointer
3985 mov(SP, Rtsp);
3987 // Bang stack for total size given plus stack shadow page size.
3988 // Bang one page at a time because a large size can overflow yellow and
3989 // red zones (the bang will fail but stack overflow handling can't tell that
3990 // it was a stack overflow bang vs a regular segv).
3991 int offset = os::vm_page_size();
3992 Register Roffset = Rscratch;
3994 Label loop;
3995 bind(loop);
3996 set((-offset)+STACK_BIAS, Rscratch);
3997 st(G0, Rtsp, Rscratch);
3998 set(offset, Roffset);
3999 sub(Rsize, Roffset, Rsize);
4000 cmp(Rsize, G0);
4001 br(Assembler::greater, false, Assembler::pn, loop);
4002 delayed()->sub(Rtsp, Roffset, Rtsp);
4004 // Bang down shadow pages too.
4005 // The -1 because we already subtracted 1 page.
4006 for (int i = 0; i< StackShadowPages-1; i++) {
4007 set((-i*offset)+STACK_BIAS, Rscratch);
4008 st(G0, Rtsp, Rscratch);
4009 }
4010 }
4012 ///////////////////////////////////////////////////////////////////////////////////
4013 #ifndef SERIALGC
4015 static uint num_stores = 0;
4016 static uint num_null_pre_stores = 0;
4018 static void count_null_pre_vals(void* pre_val) {
4019 num_stores++;
4020 if (pre_val == NULL) num_null_pre_stores++;
4021 if ((num_stores % 1000000) == 0) {
4022 tty->print_cr(UINT32_FORMAT " stores, " UINT32_FORMAT " (%5.2f%%) with null pre-vals.",
4023 num_stores, num_null_pre_stores,
4024 100.0*(float)num_null_pre_stores/(float)num_stores);
4025 }
4026 }
4028 static address satb_log_enqueue_with_frame = 0;
4029 static u_char* satb_log_enqueue_with_frame_end = 0;
4031 static address satb_log_enqueue_frameless = 0;
4032 static u_char* satb_log_enqueue_frameless_end = 0;
4034 static int EnqueueCodeSize = 128 DEBUG_ONLY( + 256); // Instructions?
4036 // The calls to this don't work. We'd need to do a fair amount of work to
4037 // make it work.
4038 static void check_index(int ind) {
4039 assert(0 <= ind && ind <= 64*K && ((ind % oopSize) == 0),
4040 "Invariants.")
4041 }
4043 static void generate_satb_log_enqueue(bool with_frame) {
4044 BufferBlob* bb = BufferBlob::create("enqueue_with_frame", EnqueueCodeSize);
4045 CodeBuffer buf(bb->instructions_begin(), bb->instructions_size());
4046 MacroAssembler masm(&buf);
4047 address start = masm.pc();
4048 Register pre_val;
4050 Label refill, restart;
4051 if (with_frame) {
4052 masm.save_frame(0);
4053 pre_val = I0; // Was O0 before the save.
4054 } else {
4055 pre_val = O0;
4056 }
4057 int satb_q_index_byte_offset =
4058 in_bytes(JavaThread::satb_mark_queue_offset() +
4059 PtrQueue::byte_offset_of_index());
4060 int satb_q_buf_byte_offset =
4061 in_bytes(JavaThread::satb_mark_queue_offset() +
4062 PtrQueue::byte_offset_of_buf());
4063 assert(in_bytes(PtrQueue::byte_width_of_index()) == sizeof(intptr_t) &&
4064 in_bytes(PtrQueue::byte_width_of_buf()) == sizeof(intptr_t),
4065 "check sizes in assembly below");
4067 masm.bind(restart);
4068 masm.ld_ptr(G2_thread, satb_q_index_byte_offset, L0);
4070 masm.br_on_reg_cond(Assembler::rc_z, /*annul*/false, Assembler::pn, L0, refill);
4071 // If the branch is taken, no harm in executing this in the delay slot.
4072 masm.delayed()->ld_ptr(G2_thread, satb_q_buf_byte_offset, L1);
4073 masm.sub(L0, oopSize, L0);
4075 masm.st_ptr(pre_val, L1, L0); // [_buf + index] := I0
4076 if (!with_frame) {
4077 // Use return-from-leaf
4078 masm.retl();
4079 masm.delayed()->st_ptr(L0, G2_thread, satb_q_index_byte_offset);
4080 } else {
4081 // Not delayed.
4082 masm.st_ptr(L0, G2_thread, satb_q_index_byte_offset);
4083 }
4084 if (with_frame) {
4085 masm.ret();
4086 masm.delayed()->restore();
4087 }
4088 masm.bind(refill);
4090 address handle_zero =
4091 CAST_FROM_FN_PTR(address,
4092 &SATBMarkQueueSet::handle_zero_index_for_thread);
4093 // This should be rare enough that we can afford to save all the
4094 // scratch registers that the calling context might be using.
4095 masm.mov(G1_scratch, L0);
4096 masm.mov(G3_scratch, L1);
4097 masm.mov(G4, L2);
4098 // We need the value of O0 above (for the write into the buffer), so we
4099 // save and restore it.
4100 masm.mov(O0, L3);
4101 // Since the call will overwrite O7, we save and restore that, as well.
4102 masm.mov(O7, L4);
4103 masm.call_VM_leaf(L5, handle_zero, G2_thread);
4104 masm.mov(L0, G1_scratch);
4105 masm.mov(L1, G3_scratch);
4106 masm.mov(L2, G4);
4107 masm.mov(L3, O0);
4108 masm.br(Assembler::always, /*annul*/false, Assembler::pt, restart);
4109 masm.delayed()->mov(L4, O7);
4111 if (with_frame) {
4112 satb_log_enqueue_with_frame = start;
4113 satb_log_enqueue_with_frame_end = masm.pc();
4114 } else {
4115 satb_log_enqueue_frameless = start;
4116 satb_log_enqueue_frameless_end = masm.pc();
4117 }
4118 }
4120 static inline void generate_satb_log_enqueue_if_necessary(bool with_frame) {
4121 if (with_frame) {
4122 if (satb_log_enqueue_with_frame == 0) {
4123 generate_satb_log_enqueue(with_frame);
4124 assert(satb_log_enqueue_with_frame != 0, "postcondition.");
4125 if (G1SATBPrintStubs) {
4126 tty->print_cr("Generated with-frame satb enqueue:");
4127 Disassembler::decode((u_char*)satb_log_enqueue_with_frame,
4128 satb_log_enqueue_with_frame_end,
4129 tty);
4130 }
4131 }
4132 } else {
4133 if (satb_log_enqueue_frameless == 0) {
4134 generate_satb_log_enqueue(with_frame);
4135 assert(satb_log_enqueue_frameless != 0, "postcondition.");
4136 if (G1SATBPrintStubs) {
4137 tty->print_cr("Generated frameless satb enqueue:");
4138 Disassembler::decode((u_char*)satb_log_enqueue_frameless,
4139 satb_log_enqueue_frameless_end,
4140 tty);
4141 }
4142 }
4143 }
4144 }
4146 void MacroAssembler::g1_write_barrier_pre(Register obj, Register index, int offset, Register tmp, bool preserve_o_regs) {
4147 assert(offset == 0 || index == noreg, "choose one");
4149 if (G1DisablePreBarrier) return;
4150 // satb_log_barrier(tmp, obj, offset, preserve_o_regs);
4151 Label filtered;
4152 // satb_log_barrier_work0(tmp, filtered);
4153 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) {
4154 ld(G2,
4155 in_bytes(JavaThread::satb_mark_queue_offset() +
4156 PtrQueue::byte_offset_of_active()),
4157 tmp);
4158 } else {
4159 guarantee(in_bytes(PtrQueue::byte_width_of_active()) == 1,
4160 "Assumption");
4161 ldsb(G2,
4162 in_bytes(JavaThread::satb_mark_queue_offset() +
4163 PtrQueue::byte_offset_of_active()),
4164 tmp);
4165 }
4166 // Check on whether to annul.
4167 br_on_reg_cond(rc_z, /*annul*/false, Assembler::pt, tmp, filtered);
4168 delayed() -> nop();
4170 // satb_log_barrier_work1(tmp, offset);
4171 if (index == noreg) {
4172 if (Assembler::is_simm13(offset)) {
4173 ld_ptr(obj, offset, tmp);
4174 } else {
4175 set(offset, tmp);
4176 ld_ptr(obj, tmp, tmp);
4177 }
4178 } else {
4179 ld_ptr(obj, index, tmp);
4180 }
4182 // satb_log_barrier_work2(obj, tmp, offset);
4184 // satb_log_barrier_work3(tmp, filtered, preserve_o_regs);
4186 const Register pre_val = tmp;
4188 if (G1SATBBarrierPrintNullPreVals) {
4189 save_frame(0);
4190 mov(pre_val, O0);
4191 // Save G-regs that target may use.
4192 mov(G1, L1);
4193 mov(G2, L2);
4194 mov(G3, L3);
4195 mov(G4, L4);
4196 mov(G5, L5);
4197 call(CAST_FROM_FN_PTR(address, &count_null_pre_vals));
4198 delayed()->nop();
4199 // Restore G-regs that target may have used.
4200 mov(L1, G1);
4201 mov(L2, G2);
4202 mov(L3, G3);
4203 mov(L4, G4);
4204 mov(L5, G5);
4205 restore(G0, G0, G0);
4206 }
4208 // Check on whether to annul.
4209 br_on_reg_cond(rc_z, /*annul*/false, Assembler::pt, pre_val, filtered);
4210 delayed() -> nop();
4212 // OK, it's not filtered, so we'll need to call enqueue. In the normal
4213 // case, pre_val will be a scratch G-reg, but there's some cases in which
4214 // it's an O-reg. In the first case, do a normal call. In the latter,
4215 // do a save here and call the frameless version.
4217 guarantee(pre_val->is_global() || pre_val->is_out(),
4218 "Or we need to think harder.");
4219 if (pre_val->is_global() && !preserve_o_regs) {
4220 generate_satb_log_enqueue_if_necessary(true); // with frame.
4221 call(satb_log_enqueue_with_frame);
4222 delayed()->mov(pre_val, O0);
4223 } else {
4224 generate_satb_log_enqueue_if_necessary(false); // with frameless.
4225 save_frame(0);
4226 call(satb_log_enqueue_frameless);
4227 delayed()->mov(pre_val->after_save(), O0);
4228 restore();
4229 }
4231 bind(filtered);
4232 }
4234 static jint num_ct_writes = 0;
4235 static jint num_ct_writes_filtered_in_hr = 0;
4236 static jint num_ct_writes_filtered_null = 0;
4237 static jint num_ct_writes_filtered_pop = 0;
4238 static G1CollectedHeap* g1 = NULL;
4240 static Thread* count_ct_writes(void* filter_val, void* new_val) {
4241 Atomic::inc(&num_ct_writes);
4242 if (filter_val == NULL) {
4243 Atomic::inc(&num_ct_writes_filtered_in_hr);
4244 } else if (new_val == NULL) {
4245 Atomic::inc(&num_ct_writes_filtered_null);
4246 } else {
4247 if (g1 == NULL) {
4248 g1 = G1CollectedHeap::heap();
4249 }
4250 if ((HeapWord*)new_val < g1->popular_object_boundary()) {
4251 Atomic::inc(&num_ct_writes_filtered_pop);
4252 }
4253 }
4254 if ((num_ct_writes % 1000000) == 0) {
4255 jint num_ct_writes_filtered =
4256 num_ct_writes_filtered_in_hr +
4257 num_ct_writes_filtered_null +
4258 num_ct_writes_filtered_pop;
4260 tty->print_cr("%d potential CT writes: %5.2f%% filtered\n"
4261 " (%5.2f%% intra-HR, %5.2f%% null, %5.2f%% popular).",
4262 num_ct_writes,
4263 100.0*(float)num_ct_writes_filtered/(float)num_ct_writes,
4264 100.0*(float)num_ct_writes_filtered_in_hr/
4265 (float)num_ct_writes,
4266 100.0*(float)num_ct_writes_filtered_null/
4267 (float)num_ct_writes,
4268 100.0*(float)num_ct_writes_filtered_pop/
4269 (float)num_ct_writes);
4270 }
4271 return Thread::current();
4272 }
4274 static address dirty_card_log_enqueue = 0;
4275 static u_char* dirty_card_log_enqueue_end = 0;
4277 // This gets to assume that o0 contains the object address.
4278 static void generate_dirty_card_log_enqueue(jbyte* byte_map_base) {
4279 BufferBlob* bb = BufferBlob::create("dirty_card_enqueue", EnqueueCodeSize*2);
4280 CodeBuffer buf(bb->instructions_begin(), bb->instructions_size());
4281 MacroAssembler masm(&buf);
4282 address start = masm.pc();
4284 Label not_already_dirty, restart, refill;
4286 #ifdef _LP64
4287 masm.srlx(O0, CardTableModRefBS::card_shift, O0);
4288 #else
4289 masm.srl(O0, CardTableModRefBS::card_shift, O0);
4290 #endif
4291 Address rs(O1, (address)byte_map_base);
4292 masm.load_address(rs); // O1 := <card table base>
4293 masm.ldub(O0, O1, O2); // O2 := [O0 + O1]
4295 masm.br_on_reg_cond(Assembler::rc_nz, /*annul*/false, Assembler::pt,
4296 O2, not_already_dirty);
4297 // Get O1 + O2 into a reg by itself -- useful in the take-the-branch
4298 // case, harmless if not.
4299 masm.delayed()->add(O0, O1, O3);
4301 // We didn't take the branch, so we're already dirty: return.
4302 // Use return-from-leaf
4303 masm.retl();
4304 masm.delayed()->nop();
4306 // Not dirty.
4307 masm.bind(not_already_dirty);
4308 // First, dirty it.
4309 masm.stb(G0, O3, G0); // [cardPtr] := 0 (i.e., dirty).
4310 int dirty_card_q_index_byte_offset =
4311 in_bytes(JavaThread::dirty_card_queue_offset() +
4312 PtrQueue::byte_offset_of_index());
4313 int dirty_card_q_buf_byte_offset =
4314 in_bytes(JavaThread::dirty_card_queue_offset() +
4315 PtrQueue::byte_offset_of_buf());
4316 masm.bind(restart);
4317 masm.ld_ptr(G2_thread, dirty_card_q_index_byte_offset, L0);
4319 masm.br_on_reg_cond(Assembler::rc_z, /*annul*/false, Assembler::pn,
4320 L0, refill);
4321 // If the branch is taken, no harm in executing this in the delay slot.
4322 masm.delayed()->ld_ptr(G2_thread, dirty_card_q_buf_byte_offset, L1);
4323 masm.sub(L0, oopSize, L0);
4325 masm.st_ptr(O3, L1, L0); // [_buf + index] := I0
4326 // Use return-from-leaf
4327 masm.retl();
4328 masm.delayed()->st_ptr(L0, G2_thread, dirty_card_q_index_byte_offset);
4330 masm.bind(refill);
4331 address handle_zero =
4332 CAST_FROM_FN_PTR(address,
4333 &DirtyCardQueueSet::handle_zero_index_for_thread);
4334 // This should be rare enough that we can afford to save all the
4335 // scratch registers that the calling context might be using.
4336 masm.mov(G1_scratch, L3);
4337 masm.mov(G3_scratch, L5);
4338 // We need the value of O3 above (for the write into the buffer), so we
4339 // save and restore it.
4340 masm.mov(O3, L6);
4341 // Since the call will overwrite O7, we save and restore that, as well.
4342 masm.mov(O7, L4);
4344 masm.call_VM_leaf(L7_thread_cache, handle_zero, G2_thread);
4345 masm.mov(L3, G1_scratch);
4346 masm.mov(L5, G3_scratch);
4347 masm.mov(L6, O3);
4348 masm.br(Assembler::always, /*annul*/false, Assembler::pt, restart);
4349 masm.delayed()->mov(L4, O7);
4351 dirty_card_log_enqueue = start;
4352 dirty_card_log_enqueue_end = masm.pc();
4353 // XXX Should have a guarantee here about not going off the end!
4354 // Does it already do so? Do an experiment...
4355 }
4357 static inline void
4358 generate_dirty_card_log_enqueue_if_necessary(jbyte* byte_map_base) {
4359 if (dirty_card_log_enqueue == 0) {
4360 generate_dirty_card_log_enqueue(byte_map_base);
4361 assert(dirty_card_log_enqueue != 0, "postcondition.");
4362 if (G1SATBPrintStubs) {
4363 tty->print_cr("Generated dirty_card enqueue:");
4364 Disassembler::decode((u_char*)dirty_card_log_enqueue,
4365 dirty_card_log_enqueue_end,
4366 tty);
4367 }
4368 }
4369 }
4372 void MacroAssembler::g1_write_barrier_post(Register store_addr, Register new_val, Register tmp) {
4374 Label filtered;
4375 MacroAssembler* post_filter_masm = this;
4377 if (new_val == G0) return;
4378 if (G1DisablePostBarrier) return;
4380 G1SATBCardTableModRefBS* bs = (G1SATBCardTableModRefBS*) Universe::heap()->barrier_set();
4381 assert(bs->kind() == BarrierSet::G1SATBCT ||
4382 bs->kind() == BarrierSet::G1SATBCTLogging, "wrong barrier");
4383 if (G1RSBarrierRegionFilter) {
4384 xor3(store_addr, new_val, tmp);
4385 #ifdef _LP64
4386 srlx(tmp, HeapRegion::LogOfHRGrainBytes, tmp);
4387 #else
4388 srl(tmp, HeapRegion::LogOfHRGrainBytes, tmp);
4389 #endif
4390 if (G1PrintCTFilterStats) {
4391 guarantee(tmp->is_global(), "Or stats won't work...");
4392 // This is a sleazy hack: I'm temporarily hijacking G2, which I
4393 // promise to restore.
4394 mov(new_val, G2);
4395 save_frame(0);
4396 mov(tmp, O0);
4397 mov(G2, O1);
4398 // Save G-regs that target may use.
4399 mov(G1, L1);
4400 mov(G2, L2);
4401 mov(G3, L3);
4402 mov(G4, L4);
4403 mov(G5, L5);
4404 call(CAST_FROM_FN_PTR(address, &count_ct_writes));
4405 delayed()->nop();
4406 mov(O0, G2);
4407 // Restore G-regs that target may have used.
4408 mov(L1, G1);
4409 mov(L3, G3);
4410 mov(L4, G4);
4411 mov(L5, G5);
4412 restore(G0, G0, G0);
4413 }
4414 // XXX Should I predict this taken or not? Does it mattern?
4415 br_on_reg_cond(rc_z, /*annul*/false, Assembler::pt, tmp, filtered);
4416 delayed()->nop();
4417 }
4419 // Now we decide how to generate the card table write. If we're
4420 // enqueueing, we call out to a generated function. Otherwise, we do it
4421 // inline here.
4423 if (G1RSBarrierUseQueue) {
4424 // If the "store_addr" register is an "in" or "local" register, move it to
4425 // a scratch reg so we can pass it as an argument.
4426 bool use_scr = !(store_addr->is_global() || store_addr->is_out());
4427 // Pick a scratch register different from "tmp".
4428 Register scr = (tmp == G1_scratch ? G3_scratch : G1_scratch);
4429 // Make sure we use up the delay slot!
4430 if (use_scr) {
4431 post_filter_masm->mov(store_addr, scr);
4432 } else {
4433 post_filter_masm->nop();
4434 }
4435 generate_dirty_card_log_enqueue_if_necessary(bs->byte_map_base);
4436 save_frame(0);
4437 call(dirty_card_log_enqueue);
4438 if (use_scr) {
4439 delayed()->mov(scr, O0);
4440 } else {
4441 delayed()->mov(store_addr->after_save(), O0);
4442 }
4443 restore();
4445 } else {
4447 #ifdef _LP64
4448 post_filter_masm->srlx(store_addr, CardTableModRefBS::card_shift, store_addr);
4449 #else
4450 post_filter_masm->srl(store_addr, CardTableModRefBS::card_shift, store_addr);
4451 #endif
4452 assert( tmp != store_addr, "need separate temp reg");
4453 Address rs(tmp, (address)bs->byte_map_base);
4454 load_address(rs);
4455 stb(G0, rs.base(), store_addr);
4456 }
4458 bind(filtered);
4460 }
4462 #endif // SERIALGC
4463 ///////////////////////////////////////////////////////////////////////////////////
4465 void MacroAssembler::card_write_barrier_post(Register store_addr, Register new_val, Register tmp) {
4466 // If we're writing constant NULL, we can skip the write barrier.
4467 if (new_val == G0) return;
4468 CardTableModRefBS* bs = (CardTableModRefBS*) Universe::heap()->barrier_set();
4469 assert(bs->kind() == BarrierSet::CardTableModRef ||
4470 bs->kind() == BarrierSet::CardTableExtension, "wrong barrier");
4471 card_table_write(bs->byte_map_base, tmp, store_addr);
4472 }
4474 // Loading values by size and signed-ness
4475 void MacroAssembler::load_sized_value(Register s1, RegisterOrConstant s2, Register d,
4476 int size_in_bytes, bool is_signed) {
4477 switch (size_in_bytes ^ (is_signed ? -1 : 0)) {
4478 case ~8: // fall through:
4479 case 8: ld_long( s1, s2, d ); break;
4480 case ~4: ldsw( s1, s2, d ); break;
4481 case 4: lduw( s1, s2, d ); break;
4482 case ~2: ldsh( s1, s2, d ); break;
4483 case 2: lduh( s1, s2, d ); break;
4484 case ~1: ldsb( s1, s2, d ); break;
4485 case 1: ldub( s1, s2, d ); break;
4486 default: ShouldNotReachHere();
4487 }
4488 }
4492 void MacroAssembler::load_klass(Register src_oop, Register klass) {
4493 // The number of bytes in this code is used by
4494 // MachCallDynamicJavaNode::ret_addr_offset()
4495 // if this changes, change that.
4496 if (UseCompressedOops) {
4497 lduw(src_oop, oopDesc::klass_offset_in_bytes(), klass);
4498 decode_heap_oop_not_null(klass);
4499 } else {
4500 ld_ptr(src_oop, oopDesc::klass_offset_in_bytes(), klass);
4501 }
4502 }
4504 void MacroAssembler::store_klass(Register klass, Register dst_oop) {
4505 if (UseCompressedOops) {
4506 assert(dst_oop != klass, "not enough registers");
4507 encode_heap_oop_not_null(klass);
4508 st(klass, dst_oop, oopDesc::klass_offset_in_bytes());
4509 } else {
4510 st_ptr(klass, dst_oop, oopDesc::klass_offset_in_bytes());
4511 }
4512 }
4514 void MacroAssembler::store_klass_gap(Register s, Register d) {
4515 if (UseCompressedOops) {
4516 assert(s != d, "not enough registers");
4517 st(s, d, oopDesc::klass_gap_offset_in_bytes());
4518 }
4519 }
4521 void MacroAssembler::load_heap_oop(const Address& s, Register d, int offset) {
4522 if (UseCompressedOops) {
4523 lduw(s, d, offset);
4524 decode_heap_oop(d);
4525 } else {
4526 ld_ptr(s, d, offset);
4527 }
4528 }
4530 void MacroAssembler::load_heap_oop(Register s1, Register s2, Register d) {
4531 if (UseCompressedOops) {
4532 lduw(s1, s2, d);
4533 decode_heap_oop(d, d);
4534 } else {
4535 ld_ptr(s1, s2, d);
4536 }
4537 }
4539 void MacroAssembler::load_heap_oop(Register s1, int simm13a, Register d) {
4540 if (UseCompressedOops) {
4541 lduw(s1, simm13a, d);
4542 decode_heap_oop(d, d);
4543 } else {
4544 ld_ptr(s1, simm13a, d);
4545 }
4546 }
4548 void MacroAssembler::store_heap_oop(Register d, Register s1, Register s2) {
4549 if (UseCompressedOops) {
4550 assert(s1 != d && s2 != d, "not enough registers");
4551 encode_heap_oop(d);
4552 st(d, s1, s2);
4553 } else {
4554 st_ptr(d, s1, s2);
4555 }
4556 }
4558 void MacroAssembler::store_heap_oop(Register d, Register s1, int simm13a) {
4559 if (UseCompressedOops) {
4560 assert(s1 != d, "not enough registers");
4561 encode_heap_oop(d);
4562 st(d, s1, simm13a);
4563 } else {
4564 st_ptr(d, s1, simm13a);
4565 }
4566 }
4568 void MacroAssembler::store_heap_oop(Register d, const Address& a, int offset) {
4569 if (UseCompressedOops) {
4570 assert(a.base() != d, "not enough registers");
4571 encode_heap_oop(d);
4572 st(d, a, offset);
4573 } else {
4574 st_ptr(d, a, offset);
4575 }
4576 }
4579 void MacroAssembler::encode_heap_oop(Register src, Register dst) {
4580 assert (UseCompressedOops, "must be compressed");
4581 assert (Universe::heap() != NULL, "java heap should be initialized");
4582 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
4583 verify_oop(src);
4584 if (Universe::narrow_oop_base() == NULL) {
4585 srlx(src, LogMinObjAlignmentInBytes, dst);
4586 return;
4587 }
4588 Label done;
4589 if (src == dst) {
4590 // optimize for frequent case src == dst
4591 bpr(rc_nz, true, Assembler::pt, src, done);
4592 delayed() -> sub(src, G6_heapbase, dst); // annuled if not taken
4593 bind(done);
4594 srlx(src, LogMinObjAlignmentInBytes, dst);
4595 } else {
4596 bpr(rc_z, false, Assembler::pn, src, done);
4597 delayed() -> mov(G0, dst);
4598 // could be moved before branch, and annulate delay,
4599 // but may add some unneeded work decoding null
4600 sub(src, G6_heapbase, dst);
4601 srlx(dst, LogMinObjAlignmentInBytes, dst);
4602 bind(done);
4603 }
4604 }
4607 void MacroAssembler::encode_heap_oop_not_null(Register r) {
4608 assert (UseCompressedOops, "must be compressed");
4609 assert (Universe::heap() != NULL, "java heap should be initialized");
4610 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
4611 verify_oop(r);
4612 if (Universe::narrow_oop_base() != NULL)
4613 sub(r, G6_heapbase, r);
4614 srlx(r, LogMinObjAlignmentInBytes, r);
4615 }
4617 void MacroAssembler::encode_heap_oop_not_null(Register src, Register dst) {
4618 assert (UseCompressedOops, "must be compressed");
4619 assert (Universe::heap() != NULL, "java heap should be initialized");
4620 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
4621 verify_oop(src);
4622 if (Universe::narrow_oop_base() == NULL) {
4623 srlx(src, LogMinObjAlignmentInBytes, dst);
4624 } else {
4625 sub(src, G6_heapbase, dst);
4626 srlx(dst, LogMinObjAlignmentInBytes, dst);
4627 }
4628 }
4630 // Same algorithm as oops.inline.hpp decode_heap_oop.
4631 void MacroAssembler::decode_heap_oop(Register src, Register dst) {
4632 assert (UseCompressedOops, "must be compressed");
4633 assert (Universe::heap() != NULL, "java heap should be initialized");
4634 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
4635 sllx(src, LogMinObjAlignmentInBytes, dst);
4636 if (Universe::narrow_oop_base() != NULL) {
4637 Label done;
4638 bpr(rc_nz, true, Assembler::pt, dst, done);
4639 delayed() -> add(dst, G6_heapbase, dst); // annuled if not taken
4640 bind(done);
4641 }
4642 verify_oop(dst);
4643 }
4645 void MacroAssembler::decode_heap_oop_not_null(Register r) {
4646 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
4647 // pd_code_size_limit.
4648 // Also do not verify_oop as this is called by verify_oop.
4649 assert (UseCompressedOops, "must be compressed");
4650 assert (Universe::heap() != NULL, "java heap should be initialized");
4651 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
4652 sllx(r, LogMinObjAlignmentInBytes, r);
4653 if (Universe::narrow_oop_base() != NULL)
4654 add(r, G6_heapbase, r);
4655 }
4657 void MacroAssembler::decode_heap_oop_not_null(Register src, Register dst) {
4658 // Do not add assert code to this unless you change vtableStubs_sparc.cpp
4659 // pd_code_size_limit.
4660 // Also do not verify_oop as this is called by verify_oop.
4661 assert (UseCompressedOops, "must be compressed");
4662 assert (Universe::heap() != NULL, "java heap should be initialized");
4663 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
4664 sllx(src, LogMinObjAlignmentInBytes, dst);
4665 if (Universe::narrow_oop_base() != NULL)
4666 add(dst, G6_heapbase, dst);
4667 }
4669 void MacroAssembler::reinit_heapbase() {
4670 if (UseCompressedOops) {
4671 // call indirectly to solve generation ordering problem
4672 Address base(G6_heapbase, (address)Universe::narrow_oop_base_addr());
4673 load_ptr_contents(base, G6_heapbase);
4674 }
4675 }