1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2012, 2013 SAP AG. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/assembler.hpp" 28 #include "asm/macroAssembler.inline.hpp" 29 #include "interpreter/interpreter.hpp" 30 #include "nativeInst_ppc.hpp" 31 #include "oops/instanceOop.hpp" 32 #include "oops/method.hpp" 33 #include "oops/objArrayKlass.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "prims/methodHandles.hpp" 36 #include "runtime/frame.inline.hpp" 37 #include "runtime/handles.inline.hpp" 38 #include "runtime/sharedRuntime.hpp" 39 #include "runtime/stubCodeGenerator.hpp" 40 #include "runtime/stubRoutines.hpp" 41 #include "utilities/top.hpp" 42 #ifdef TARGET_OS_FAMILY_aix 43 # include "thread_aix.inline.hpp" 44 #endif 45 #ifdef TARGET_OS_FAMILY_linux 46 # include "thread_linux.inline.hpp" 47 #endif 48 #ifdef COMPILER2 49 #include "opto/runtime.hpp" 50 #endif 51 52 #define __ _masm-> 53 54 #ifdef PRODUCT 55 #define BLOCK_COMMENT(str) // nothing 56 #else 57 #define BLOCK_COMMENT(str) __ block_comment(str) 58 #endif 59 60 class StubGenerator: public StubCodeGenerator { 61 private: 62 63 // Call stubs are used to call Java from C 64 // 65 // Arguments: 66 // 67 // R3 - call wrapper address : address 68 // R4 - result : intptr_t* 69 // R5 - result type : BasicType 70 // R6 - method : Method 71 // R7 - frame mgr entry point : address 72 // R8 - parameter block : intptr_t* 73 // R9 - parameter count in words : int 74 // R10 - thread : Thread* 75 // 76 address generate_call_stub(address& return_address) { 77 // Setup a new c frame, copy java arguments, call frame manager or 78 // native_entry, and process result. 79 80 StubCodeMark mark(this, "StubRoutines", "call_stub"); 81 82 address start = __ emit_fd(); 83 84 // some sanity checks 85 assert((sizeof(frame::abi_48) % 16) == 0, "unaligned"); 86 assert((sizeof(frame::abi_112) % 16) == 0, "unaligned"); 87 assert((sizeof(frame::spill_nonvolatiles) % 16) == 0, "unaligned"); 88 assert((sizeof(frame::parent_ijava_frame_abi) % 16) == 0, "unaligned"); 89 assert((sizeof(frame::entry_frame_locals) % 16) == 0, "unaligned"); 90 91 Register r_arg_call_wrapper_addr = R3; 92 Register r_arg_result_addr = R4; 93 Register r_arg_result_type = R5; 94 Register r_arg_method = R6; 95 Register r_arg_entry = R7; 96 Register r_arg_thread = R10; 97 98 Register r_temp = R24; 99 Register r_top_of_arguments_addr = R25; 100 Register r_entryframe_fp = R26; 101 102 { 103 // Stack on entry to call_stub: 104 // 105 // F1 [C_FRAME] 106 // ... 107 108 Register r_arg_argument_addr = R8; 109 Register r_arg_argument_count = R9; 110 Register r_frame_alignment_in_bytes = R27; 111 Register r_argument_addr = R28; 112 Register r_argumentcopy_addr = R29; 113 Register r_argument_size_in_bytes = R30; 114 Register r_frame_size = R23; 115 116 Label arguments_copied; 117 118 // Save LR/CR to caller's C_FRAME. 119 __ save_LR_CR(R0); 120 121 // Zero extend arg_argument_count. 122 __ clrldi(r_arg_argument_count, r_arg_argument_count, 32); 123 124 // Save non-volatiles GPRs to ENTRY_FRAME (not yet pushed, but it's safe). 125 __ save_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14)); 126 127 // Keep copy of our frame pointer (caller's SP). 128 __ mr(r_entryframe_fp, R1_SP); 129 130 BLOCK_COMMENT("Push ENTRY_FRAME including arguments"); 131 // Push ENTRY_FRAME including arguments: 132 // 133 // F0 [TOP_IJAVA_FRAME_ABI] 134 // alignment (optional) 135 // [outgoing Java arguments] 136 // [ENTRY_FRAME_LOCALS] 137 // F1 [C_FRAME] 138 // ... 139 140 // calculate frame size 141 142 // unaligned size of arguments 143 __ sldi(r_argument_size_in_bytes, 144 r_arg_argument_count, Interpreter::logStackElementSize); 145 // arguments alignment (max 1 slot) 146 // FIXME: use round_to() here 147 __ andi_(r_frame_alignment_in_bytes, r_arg_argument_count, 1); 148 __ sldi(r_frame_alignment_in_bytes, 149 r_frame_alignment_in_bytes, Interpreter::logStackElementSize); 150 151 // size = unaligned size of arguments + top abi's size 152 __ addi(r_frame_size, r_argument_size_in_bytes, 153 frame::top_ijava_frame_abi_size); 154 // size += arguments alignment 155 __ add(r_frame_size, 156 r_frame_size, r_frame_alignment_in_bytes); 157 // size += size of call_stub locals 158 __ addi(r_frame_size, 159 r_frame_size, frame::entry_frame_locals_size); 160 161 // push ENTRY_FRAME 162 __ push_frame(r_frame_size, r_temp); 163 164 // initialize call_stub locals (step 1) 165 __ std(r_arg_call_wrapper_addr, 166 _entry_frame_locals_neg(call_wrapper_address), r_entryframe_fp); 167 __ std(r_arg_result_addr, 168 _entry_frame_locals_neg(result_address), r_entryframe_fp); 169 __ std(r_arg_result_type, 170 _entry_frame_locals_neg(result_type), r_entryframe_fp); 171 // we will save arguments_tos_address later 172 173 174 BLOCK_COMMENT("Copy Java arguments"); 175 // copy Java arguments 176 177 // Calculate top_of_arguments_addr which will be R17_tos (not prepushed) later. 178 // FIXME: why not simply use SP+frame::top_ijava_frame_size? 179 __ addi(r_top_of_arguments_addr, 180 R1_SP, frame::top_ijava_frame_abi_size); 181 __ add(r_top_of_arguments_addr, 182 r_top_of_arguments_addr, r_frame_alignment_in_bytes); 183 184 // any arguments to copy? 185 __ cmpdi(CCR0, r_arg_argument_count, 0); 186 __ beq(CCR0, arguments_copied); 187 188 // prepare loop and copy arguments in reverse order 189 { 190 // init CTR with arg_argument_count 191 __ mtctr(r_arg_argument_count); 192 193 // let r_argumentcopy_addr point to last outgoing Java arguments P 194 __ mr(r_argumentcopy_addr, r_top_of_arguments_addr); 195 196 // let r_argument_addr point to last incoming java argument 197 __ add(r_argument_addr, 198 r_arg_argument_addr, r_argument_size_in_bytes); 199 __ addi(r_argument_addr, r_argument_addr, -BytesPerWord); 200 201 // now loop while CTR > 0 and copy arguments 202 { 203 Label next_argument; 204 __ bind(next_argument); 205 206 __ ld(r_temp, 0, r_argument_addr); 207 // argument_addr--; 208 __ addi(r_argument_addr, r_argument_addr, -BytesPerWord); 209 __ std(r_temp, 0, r_argumentcopy_addr); 210 // argumentcopy_addr++; 211 __ addi(r_argumentcopy_addr, r_argumentcopy_addr, BytesPerWord); 212 213 __ bdnz(next_argument); 214 } 215 } 216 217 // Arguments copied, continue. 218 __ bind(arguments_copied); 219 } 220 221 { 222 BLOCK_COMMENT("Call frame manager or native entry."); 223 // Call frame manager or native entry. 224 Register r_new_arg_entry = R14_state; 225 assert_different_registers(r_new_arg_entry, r_top_of_arguments_addr, 226 r_arg_method, r_arg_thread); 227 228 __ mr(r_new_arg_entry, r_arg_entry); 229 230 // Register state on entry to frame manager / native entry: 231 // 232 // R17_tos - intptr_t* sender tos (prepushed) Lesp = (SP) + copied_arguments_offset - 8 233 // R19_method - Method 234 // R16_thread - JavaThread* 235 236 // R17_tos must point to last argument - element_size. 237 __ addi(R17_tos, r_top_of_arguments_addr, -Interpreter::stackElementSize); 238 239 // initialize call_stub locals (step 2) 240 // now save R17_tos as arguments_tos_address 241 __ std(R17_tos, _entry_frame_locals_neg(arguments_tos_address), r_entryframe_fp); 242 243 // load argument registers for call 244 __ mr(R19_method, r_arg_method); 245 __ mr(R16_thread, r_arg_thread); 246 assert(R17_tos != r_arg_method, "trashed r_arg_method"); 247 assert(R17_tos != r_arg_thread && R19_method != r_arg_thread, "trashed r_arg_thread"); 248 249 // Set R15_prev_state to 0 for simplifying checks in callee. 250 __ li(R15_prev_state, 0); 251 252 // Stack on entry to frame manager / native entry: 253 // 254 // F0 [TOP_IJAVA_FRAME_ABI] 255 // alignment (optional) 256 // [outgoing Java arguments] 257 // [ENTRY_FRAME_LOCALS] 258 // F1 [C_FRAME] 259 // ... 260 // 261 262 // global toc register 263 __ load_const(R29, MacroAssembler::global_toc(), R11_scratch1); 264 265 // Load narrow oop base. 266 __ reinit_heapbase(R30, R11_scratch1); 267 268 // Remember the senderSP so we interpreter can pop c2i arguments off of the stack 269 // when called via a c2i. 270 271 // Pass initial_caller_sp to framemanager. 272 __ mr(R21_tmp1, R1_SP); 273 274 // Do a light-weight C-call here, r_new_arg_entry holds the address 275 // of the interpreter entry point (frame manager or native entry) 276 // and save runtime-value of LR in return_address. 277 assert(r_new_arg_entry != R17_tos && r_new_arg_entry != R19_method && r_new_arg_entry != R16_thread, 278 "trashed r_new_arg_entry"); 279 return_address = __ call_stub(r_new_arg_entry); 280 } 281 282 { 283 BLOCK_COMMENT("Returned from frame manager or native entry."); 284 // Returned from frame manager or native entry. 285 // Now pop frame, process result, and return to caller. 286 287 // Stack on exit from frame manager / native entry: 288 // 289 // F0 [ABI] 290 // ... 291 // [ENTRY_FRAME_LOCALS] 292 // F1 [C_FRAME] 293 // ... 294 // 295 // Just pop the topmost frame ... 296 // 297 298 Label ret_is_object; 299 Label ret_is_long; 300 Label ret_is_float; 301 Label ret_is_double; 302 303 Register r_entryframe_fp = R30; 304 Register r_lr = R7_ARG5; 305 Register r_cr = R8_ARG6; 306 307 // Reload some volatile registers which we've spilled before the call 308 // to frame manager / native entry. 309 // Access all locals via frame pointer, because we know nothing about 310 // the topmost frame's size. 311 __ ld(r_entryframe_fp, _abi(callers_sp), R1_SP); 312 assert_different_registers(r_entryframe_fp, R3_RET, r_arg_result_addr, r_arg_result_type, r_cr, r_lr); 313 __ ld(r_arg_result_addr, 314 _entry_frame_locals_neg(result_address), r_entryframe_fp); 315 __ ld(r_arg_result_type, 316 _entry_frame_locals_neg(result_type), r_entryframe_fp); 317 __ ld(r_cr, _abi(cr), r_entryframe_fp); 318 __ ld(r_lr, _abi(lr), r_entryframe_fp); 319 320 // pop frame and restore non-volatiles, LR and CR 321 __ mr(R1_SP, r_entryframe_fp); 322 __ mtcr(r_cr); 323 __ mtlr(r_lr); 324 325 // Store result depending on type. Everything that is not 326 // T_OBJECT, T_LONG, T_FLOAT, or T_DOUBLE is treated as T_INT. 327 __ cmpwi(CCR0, r_arg_result_type, T_OBJECT); 328 __ cmpwi(CCR1, r_arg_result_type, T_LONG); 329 __ cmpwi(CCR5, r_arg_result_type, T_FLOAT); 330 __ cmpwi(CCR6, r_arg_result_type, T_DOUBLE); 331 332 // restore non-volatile registers 333 __ restore_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14)); 334 335 336 // Stack on exit from call_stub: 337 // 338 // 0 [C_FRAME] 339 // ... 340 // 341 // no call_stub frames left. 342 343 // All non-volatiles have been restored at this point!! 344 assert(R3_RET == R3, "R3_RET should be R3"); 345 346 __ beq(CCR0, ret_is_object); 347 __ beq(CCR1, ret_is_long); 348 __ beq(CCR5, ret_is_float); 349 __ beq(CCR6, ret_is_double); 350 351 // default: 352 __ stw(R3_RET, 0, r_arg_result_addr); 353 __ blr(); // return to caller 354 355 // case T_OBJECT: 356 __ bind(ret_is_object); 357 __ std(R3_RET, 0, r_arg_result_addr); 358 __ blr(); // return to caller 359 360 // case T_LONG: 361 __ bind(ret_is_long); 362 __ std(R3_RET, 0, r_arg_result_addr); 363 __ blr(); // return to caller 364 365 // case T_FLOAT: 366 __ bind(ret_is_float); 367 __ stfs(F1_RET, 0, r_arg_result_addr); 368 __ blr(); // return to caller 369 370 // case T_DOUBLE: 371 __ bind(ret_is_double); 372 __ stfd(F1_RET, 0, r_arg_result_addr); 373 __ blr(); // return to caller 374 } 375 376 return start; 377 } 378 379 // Return point for a Java call if there's an exception thrown in 380 // Java code. The exception is caught and transformed into a 381 // pending exception stored in JavaThread that can be tested from 382 // within the VM. 383 // 384 address generate_catch_exception() { 385 StubCodeMark mark(this, "StubRoutines", "catch_exception"); 386 387 address start = __ pc(); 388 389 // Registers alive 390 // 391 // R16_thread 392 // R3_ARG1 - address of pending exception 393 // R4_ARG2 - return address in call stub 394 395 const Register exception_file = R21_tmp1; 396 const Register exception_line = R22_tmp2; 397 398 __ load_const(exception_file, (void*)__FILE__); 399 __ load_const(exception_line, (void*)__LINE__); 400 401 __ std(R3_ARG1, thread_(pending_exception)); 402 // store into `char *' 403 __ std(exception_file, thread_(exception_file)); 404 // store into `int' 405 __ stw(exception_line, thread_(exception_line)); 406 407 // complete return to VM 408 assert(StubRoutines::_call_stub_return_address != NULL, "must have been generated before"); 409 410 __ mtlr(R4_ARG2); 411 // continue in call stub 412 __ blr(); 413 414 return start; 415 } 416 417 // Continuation point for runtime calls returning with a pending 418 // exception. The pending exception check happened in the runtime 419 // or native call stub. The pending exception in Thread is 420 // converted into a Java-level exception. 421 // 422 address generate_forward_exception() { 423 StubCodeMark mark(this, "StubRoutines", "forward_exception"); 424 address start = __ pc(); 425 426 #if !defined(PRODUCT) 427 if (VerifyOops) { 428 // Get pending exception oop. 429 __ ld(R3_ARG1, 430 in_bytes(Thread::pending_exception_offset()), 431 R16_thread); 432 // Make sure that this code is only executed if there is a pending exception. 433 { 434 Label L; 435 __ cmpdi(CCR0, R3_ARG1, 0); 436 __ bne(CCR0, L); 437 __ stop("StubRoutines::forward exception: no pending exception (1)"); 438 __ bind(L); 439 } 440 __ verify_oop(R3_ARG1, "StubRoutines::forward exception: not an oop"); 441 } 442 #endif 443 444 // Save LR/CR and copy exception pc (LR) into R4_ARG2. 445 __ save_LR_CR(R4_ARG2); 446 __ push_frame_abi112(0, R0); 447 // Find exception handler. 448 __ call_VM_leaf(CAST_FROM_FN_PTR(address, 449 SharedRuntime::exception_handler_for_return_address), 450 R16_thread, 451 R4_ARG2); 452 // Copy handler's address. 453 __ mtctr(R3_RET); 454 __ pop_frame(); 455 __ restore_LR_CR(R0); 456 457 // Set up the arguments for the exception handler: 458 // - R3_ARG1: exception oop 459 // - R4_ARG2: exception pc. 460 461 // Load pending exception oop. 462 __ ld(R3_ARG1, 463 in_bytes(Thread::pending_exception_offset()), 464 R16_thread); 465 466 // The exception pc is the return address in the caller. 467 // Must load it into R4_ARG2. 468 __ mflr(R4_ARG2); 469 470 #ifdef ASSERT 471 // Make sure exception is set. 472 { 473 Label L; 474 __ cmpdi(CCR0, R3_ARG1, 0); 475 __ bne(CCR0, L); 476 __ stop("StubRoutines::forward exception: no pending exception (2)"); 477 __ bind(L); 478 } 479 #endif 480 481 // Clear the pending exception. 482 __ li(R0, 0); 483 __ std(R0, 484 in_bytes(Thread::pending_exception_offset()), 485 R16_thread); 486 // Jump to exception handler. 487 __ bctr(); 488 489 return start; 490 } 491 492 #undef __ 493 #define __ masm-> 494 // Continuation point for throwing of implicit exceptions that are 495 // not handled in the current activation. Fabricates an exception 496 // oop and initiates normal exception dispatching in this 497 // frame. Only callee-saved registers are preserved (through the 498 // normal register window / RegisterMap handling). If the compiler 499 // needs all registers to be preserved between the fault point and 500 // the exception handler then it must assume responsibility for that 501 // in AbstractCompiler::continuation_for_implicit_null_exception or 502 // continuation_for_implicit_division_by_zero_exception. All other 503 // implicit exceptions (e.g., NullPointerException or 504 // AbstractMethodError on entry) are either at call sites or 505 // otherwise assume that stack unwinding will be initiated, so 506 // caller saved registers were assumed volatile in the compiler. 507 // 508 // Note that we generate only this stub into a RuntimeStub, because 509 // it needs to be properly traversed and ignored during GC, so we 510 // change the meaning of the "__" macro within this method. 511 // 512 // Note: the routine set_pc_not_at_call_for_caller in 513 // SharedRuntime.cpp requires that this code be generated into a 514 // RuntimeStub. 515 address generate_throw_exception(const char* name, address runtime_entry, bool restore_saved_exception_pc, 516 Register arg1 = noreg, Register arg2 = noreg) { 517 CodeBuffer code(name, 1024 DEBUG_ONLY(+ 512), 0); 518 MacroAssembler* masm = new MacroAssembler(&code); 519 520 OopMapSet* oop_maps = new OopMapSet(); 521 int frame_size_in_bytes = frame::abi_112_size; 522 OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0); 523 524 StubCodeMark mark(this, "StubRoutines", "throw_exception"); 525 526 address start = __ pc(); 527 528 __ save_LR_CR(R11_scratch1); 529 530 // Push a frame. 531 __ push_frame_abi112(0, R11_scratch1); 532 533 address frame_complete_pc = __ pc(); 534 535 if (restore_saved_exception_pc) { 536 __ unimplemented("StubGenerator::throw_exception with restore_saved_exception_pc", 74); 537 } 538 539 // Note that we always have a runtime stub frame on the top of 540 // stack by this point. Remember the offset of the instruction 541 // whose address will be moved to R11_scratch1. 542 address gc_map_pc = __ get_PC_trash_LR(R11_scratch1); 543 544 __ set_last_Java_frame(/*sp*/R1_SP, /*pc*/R11_scratch1); 545 546 __ mr(R3_ARG1, R16_thread); 547 if (arg1 != noreg) { 548 __ mr(R4_ARG2, arg1); 549 } 550 if (arg2 != noreg) { 551 __ mr(R5_ARG3, arg2); 552 } 553 __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, runtime_entry), 554 relocInfo::none); 555 556 // Set an oopmap for the call site. 557 oop_maps->add_gc_map((int)(gc_map_pc - start), map); 558 559 __ reset_last_Java_frame(); 560 561 #ifdef ASSERT 562 // Make sure that this code is only executed if there is a pending 563 // exception. 564 { 565 Label L; 566 __ ld(R0, 567 in_bytes(Thread::pending_exception_offset()), 568 R16_thread); 569 __ cmpdi(CCR0, R0, 0); 570 __ bne(CCR0, L); 571 __ stop("StubRoutines::throw_exception: no pending exception"); 572 __ bind(L); 573 } 574 #endif 575 576 // Pop frame. 577 __ pop_frame(); 578 579 __ restore_LR_CR(R11_scratch1); 580 581 __ load_const(R11_scratch1, StubRoutines::forward_exception_entry()); 582 __ mtctr(R11_scratch1); 583 __ bctr(); 584 585 // Create runtime stub with OopMap. 586 RuntimeStub* stub = 587 RuntimeStub::new_runtime_stub(name, &code, 588 /*frame_complete=*/ (int)(frame_complete_pc - start), 589 frame_size_in_bytes/wordSize, 590 oop_maps, 591 false); 592 return stub->entry_point(); 593 } 594 #undef __ 595 #define __ _masm-> 596 597 // Generate G1 pre-write barrier for array. 598 // 599 // Input: 600 // from - register containing src address (only needed for spilling) 601 // to - register containing starting address 602 // count - register containing element count 603 // tmp - scratch register 604 // 605 // Kills: 606 // nothing 607 // 608 void gen_write_ref_array_pre_barrier(Register from, Register to, Register count, bool dest_uninitialized, Register Rtmp1) { 609 BarrierSet* const bs = Universe::heap()->barrier_set(); 610 switch (bs->kind()) { 611 case BarrierSet::G1SATBCT: 612 case BarrierSet::G1SATBCTLogging: 613 // With G1, don't generate the call if we statically know that the target in uninitialized 614 if (!dest_uninitialized) { 615 const int spill_slots = 4 * wordSize; 616 const int frame_size = frame::abi_112_size + spill_slots; 617 618 __ save_LR_CR(R0); 619 __ push_frame_abi112(spill_slots, R0); 620 __ std(from, frame_size - 1 * wordSize, R1_SP); 621 __ std(to, frame_size - 2 * wordSize, R1_SP); 622 __ std(count, frame_size - 3 * wordSize, R1_SP); 623 624 __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_pre), to, count); 625 626 __ ld(from, frame_size - 1 * wordSize, R1_SP); 627 __ ld(to, frame_size - 2 * wordSize, R1_SP); 628 __ ld(count, frame_size - 3 * wordSize, R1_SP); 629 __ pop_frame(); 630 __ restore_LR_CR(R0); 631 } 632 break; 633 case BarrierSet::CardTableModRef: 634 case BarrierSet::CardTableExtension: 635 case BarrierSet::ModRef: 636 break; 637 default: 638 ShouldNotReachHere(); 639 } 640 } 641 642 // Generate CMS/G1 post-write barrier for array. 643 // 644 // Input: 645 // addr - register containing starting address 646 // count - register containing element count 647 // tmp - scratch register 648 // 649 // The input registers and R0 are overwritten. 650 // 651 void gen_write_ref_array_post_barrier(Register addr, Register count, Register tmp) { 652 BarrierSet* const bs = Universe::heap()->barrier_set(); 653 654 switch (bs->kind()) { 655 case BarrierSet::G1SATBCT: 656 case BarrierSet::G1SATBCTLogging: 657 { 658 __ save_LR_CR(R0); 659 // We need this frame only that the callee can spill LR/CR. 660 __ push_frame_abi112(0, R0); 661 662 __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_post), addr, count); 663 664 __ pop_frame(); 665 __ restore_LR_CR(R0); 666 } 667 break; 668 case BarrierSet::CardTableModRef: 669 case BarrierSet::CardTableExtension: 670 { 671 Label Lskip_loop, Lstore_loop; 672 if (UseConcMarkSweepGC) { 673 // TODO PPC port: contribute optimization / requires shared changes 674 __ release(); 675 } 676 677 CardTableModRefBS* const ct = (CardTableModRefBS*)bs; 678 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 679 assert_different_registers(addr, count, tmp); 680 681 __ sldi(count, count, LogBytesPerHeapOop); 682 __ addi(count, count, -BytesPerHeapOop); 683 __ add(count, addr, count); 684 // Use two shifts to clear out those low order two bits! (Cannot opt. into 1.) 685 __ srdi(addr, addr, CardTableModRefBS::card_shift); 686 __ srdi(count, count, CardTableModRefBS::card_shift); 687 __ subf(count, addr, count); 688 assert_different_registers(R0, addr, count, tmp); 689 __ load_const(tmp, (address)ct->byte_map_base); 690 __ addic_(count, count, 1); 691 __ beq(CCR0, Lskip_loop); 692 __ li(R0, 0); 693 __ mtctr(count); 694 // Byte store loop 695 __ bind(Lstore_loop); 696 __ stbx(R0, tmp, addr); 697 __ addi(addr, addr, 1); 698 __ bdnz(Lstore_loop); 699 __ bind(Lskip_loop); 700 } 701 break; 702 case BarrierSet::ModRef: 703 break; 704 default: 705 ShouldNotReachHere(); 706 } 707 } 708 709 // Support for void zero_words_aligned8(HeapWord* to, size_t count) 710 // 711 // Arguments: 712 // to: 713 // count: 714 // 715 // Destroys: 716 // 717 address generate_zero_words_aligned8() { 718 StubCodeMark mark(this, "StubRoutines", "zero_words_aligned8"); 719 720 // Implemented as in ClearArray. 721 address start = __ emit_fd(); 722 723 Register base_ptr_reg = R3_ARG1; // tohw (needs to be 8b aligned) 724 Register cnt_dwords_reg = R4_ARG2; // count (in dwords) 725 Register tmp1_reg = R5_ARG3; 726 Register tmp2_reg = R6_ARG4; 727 Register zero_reg = R7_ARG5; 728 729 // Procedure for large arrays (uses data cache block zero instruction). 730 Label dwloop, fast, fastloop, restloop, lastdword, done; 731 int cl_size=VM_Version::get_cache_line_size(), cl_dwords=cl_size>>3, cl_dwordaddr_bits=exact_log2(cl_dwords); 732 int min_dcbz=2; // Needs to be positive, apply dcbz only to at least min_dcbz cache lines. 733 734 // Clear up to 128byte boundary if long enough, dword_cnt=(16-(base>>3))%16. 735 __ dcbtst(base_ptr_reg); // Indicate write access to first cache line ... 736 __ andi(tmp2_reg, cnt_dwords_reg, 1); // to check if number of dwords is even. 737 __ srdi_(tmp1_reg, cnt_dwords_reg, 1); // number of double dwords 738 __ load_const_optimized(zero_reg, 0L); // Use as zero register. 739 740 __ cmpdi(CCR1, tmp2_reg, 0); // cnt_dwords even? 741 __ beq(CCR0, lastdword); // size <= 1 742 __ mtctr(tmp1_reg); // Speculatively preload counter for rest loop (>0). 743 __ cmpdi(CCR0, cnt_dwords_reg, (min_dcbz+1)*cl_dwords-1); // Big enough to ensure >=min_dcbz cache lines are included? 744 __ neg(tmp1_reg, base_ptr_reg); // bit 0..58: bogus, bit 57..60: (16-(base>>3))%16, bit 61..63: 000 745 746 __ blt(CCR0, restloop); // Too small. (<31=(2*cl_dwords)-1 is sufficient, but bigger performs better.) 747 __ rldicl_(tmp1_reg, tmp1_reg, 64-3, 64-cl_dwordaddr_bits); // Extract number of dwords to 128byte boundary=(16-(base>>3))%16. 748 749 __ beq(CCR0, fast); // already 128byte aligned 750 __ mtctr(tmp1_reg); // Set ctr to hit 128byte boundary (0<ctr<cnt). 751 __ subf(cnt_dwords_reg, tmp1_reg, cnt_dwords_reg); // rest (>0 since size>=256-8) 752 753 // Clear in first cache line dword-by-dword if not already 128byte aligned. 754 __ bind(dwloop); 755 __ std(zero_reg, 0, base_ptr_reg); // Clear 8byte aligned block. 756 __ addi(base_ptr_reg, base_ptr_reg, 8); 757 __ bdnz(dwloop); 758 759 // clear 128byte blocks 760 __ bind(fast); 761 __ srdi(tmp1_reg, cnt_dwords_reg, cl_dwordaddr_bits); // loop count for 128byte loop (>0 since size>=256-8) 762 __ andi(tmp2_reg, cnt_dwords_reg, 1); // to check if rest even 763 764 __ mtctr(tmp1_reg); // load counter 765 __ cmpdi(CCR1, tmp2_reg, 0); // rest even? 766 __ rldicl_(tmp1_reg, cnt_dwords_reg, 63, 65-cl_dwordaddr_bits); // rest in double dwords 767 768 __ bind(fastloop); 769 __ dcbz(base_ptr_reg); // Clear 128byte aligned block. 770 __ addi(base_ptr_reg, base_ptr_reg, cl_size); 771 __ bdnz(fastloop); 772 773 //__ dcbtst(base_ptr_reg); // Indicate write access to last cache line. 774 __ beq(CCR0, lastdword); // rest<=1 775 __ mtctr(tmp1_reg); // load counter 776 777 // Clear rest. 778 __ bind(restloop); 779 __ std(zero_reg, 0, base_ptr_reg); // Clear 8byte aligned block. 780 __ std(zero_reg, 8, base_ptr_reg); // Clear 8byte aligned block. 781 __ addi(base_ptr_reg, base_ptr_reg, 16); 782 __ bdnz(restloop); 783 784 __ bind(lastdword); 785 __ beq(CCR1, done); 786 __ std(zero_reg, 0, base_ptr_reg); 787 __ bind(done); 788 __ blr(); // return 789 790 return start; 791 } 792 793 // The following routine generates a subroutine to throw an asynchronous 794 // UnknownError when an unsafe access gets a fault that could not be 795 // reasonably prevented by the programmer. (Example: SIGBUS/OBJERR.) 796 // 797 address generate_handler_for_unsafe_access() { 798 StubCodeMark mark(this, "StubRoutines", "handler_for_unsafe_access"); 799 address start = __ emit_fd(); 800 __ unimplemented("StubRoutines::handler_for_unsafe_access", 93); 801 return start; 802 } 803 804 #if !defined(PRODUCT) 805 // Wrapper which calls oopDesc::is_oop_or_null() 806 // Only called by MacroAssembler::verify_oop 807 static void verify_oop_helper(const char* message, oop o) { 808 if (!o->is_oop_or_null()) { 809 fatal(message); 810 } 811 ++ StubRoutines::_verify_oop_count; 812 } 813 #endif 814 815 // Return address of code to be called from code generated by 816 // MacroAssembler::verify_oop. 817 // 818 // Don't generate, rather use C++ code. 819 address generate_verify_oop() { 820 StubCodeMark mark(this, "StubRoutines", "verify_oop"); 821 822 // this is actually a `FunctionDescriptor*'. 823 address start = 0; 824 825 #if !defined(PRODUCT) 826 start = CAST_FROM_FN_PTR(address, verify_oop_helper); 827 #endif 828 829 return start; 830 } 831 832 // Fairer handling of safepoints for native methods. 833 // 834 // Generate code which reads from the polling page. This special handling is needed as the 835 // linux-ppc64 kernel before 2.6.6 doesn't set si_addr on some segfaults in 64bit mode 836 // (cf. http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.6), especially when we try 837 // to read from the safepoint polling page. 838 address generate_load_from_poll() { 839 StubCodeMark mark(this, "StubRoutines", "generate_load_from_poll"); 840 address start = __ emit_fd(); 841 __ unimplemented("StubRoutines::verify_oop", 95); // TODO PPC port 842 return start; 843 } 844 845 // -XX:+OptimizeFill : convert fill/copy loops into intrinsic 846 // 847 // The code is implemented(ported from sparc) as we believe it benefits JVM98, however 848 // tracing(-XX:+TraceOptimizeFill) shows the intrinsic replacement doesn't happen at all! 849 // 850 // Source code in function is_range_check_if() shows OptimizeFill relaxed the condition 851 // for turning on loop predication optimization, and hence the behavior of "array range check" 852 // and "loop invariant check" could be influenced, which potentially boosted JVM98. 853 // 854 // We leave the code here and see if Oracle has updates in later releases(later than HS20). 855 // 856 // Generate stub for disjoint short fill. If "aligned" is true, the 857 // "to" address is assumed to be heapword aligned. 858 // 859 // Arguments for generated stub: 860 // to: R3_ARG1 861 // value: R4_ARG2 862 // count: R5_ARG3 treated as signed 863 // 864 address generate_fill(BasicType t, bool aligned, const char* name) { 865 StubCodeMark mark(this, "StubRoutines", name); 866 address start = __ emit_fd(); 867 868 const Register to = R3_ARG1; // source array address 869 const Register value = R4_ARG2; // fill value 870 const Register count = R5_ARG3; // elements count 871 const Register temp = R6_ARG4; // temp register 872 873 //assert_clean_int(count, O3); // Make sure 'count' is clean int. 874 875 Label L_exit, L_skip_align1, L_skip_align2, L_fill_byte; 876 Label L_fill_2_bytes, L_fill_4_bytes, L_fill_elements, L_fill_32_bytes; 877 878 int shift = -1; 879 switch (t) { 880 case T_BYTE: 881 shift = 2; 882 // clone bytes (zero extend not needed because store instructions below ignore high order bytes) 883 __ rldimi(value, value, 8, 48); // 8 bit -> 16 bit 884 __ cmpdi(CCR0, count, 2<<shift); // Short arrays (< 8 bytes) fill by element 885 __ blt(CCR0, L_fill_elements); 886 __ rldimi(value, value, 16, 32); // 16 bit -> 32 bit 887 break; 888 case T_SHORT: 889 shift = 1; 890 // clone bytes (zero extend not needed because store instructions below ignore high order bytes) 891 __ rldimi(value, value, 16, 32); // 16 bit -> 32 bit 892 __ cmpdi(CCR0, count, 2<<shift); // Short arrays (< 8 bytes) fill by element 893 __ blt(CCR0, L_fill_elements); 894 break; 895 case T_INT: 896 shift = 0; 897 __ cmpdi(CCR0, count, 2<<shift); // Short arrays (< 8 bytes) fill by element 898 __ blt(CCR0, L_fill_4_bytes); 899 break; 900 default: ShouldNotReachHere(); 901 } 902 903 if (!aligned && (t == T_BYTE || t == T_SHORT)) { 904 // align source address at 4 bytes address boundary 905 if (t == T_BYTE) { 906 // One byte misalignment happens only for byte arrays 907 __ andi_(temp, to, 1); 908 __ beq(CCR0, L_skip_align1); 909 __ stb(value, 0, to); 910 __ addi(to, to, 1); 911 __ addi(count, count, -1); 912 __ bind(L_skip_align1); 913 } 914 // Two bytes misalignment happens only for byte and short (char) arrays. 915 __ andi_(temp, to, 2); 916 __ beq(CCR0, L_skip_align2); 917 __ sth(value, 0, to); 918 __ addi(to, to, 2); 919 __ addi(count, count, -(1 << (shift - 1))); 920 __ bind(L_skip_align2); 921 } 922 923 if (!aligned) { 924 // Align to 8 bytes, we know we are 4 byte aligned to start. 925 __ andi_(temp, to, 7); 926 __ beq(CCR0, L_fill_32_bytes); 927 __ stw(value, 0, to); 928 __ addi(to, to, 4); 929 __ addi(count, count, -(1 << shift)); 930 __ bind(L_fill_32_bytes); 931 } 932 933 __ li(temp, 8<<shift); // prepare for 32 byte loop 934 // clone bytes int->long as above 935 __ rldimi(value, value, 32, 0); // 32 bit -> 64 bit 936 937 Label L_check_fill_8_bytes; 938 // Fill 32-byte chunks 939 __ subf_(count, temp, count); 940 __ blt(CCR0, L_check_fill_8_bytes); 941 942 Label L_fill_32_bytes_loop; 943 __ align(32); 944 __ bind(L_fill_32_bytes_loop); 945 946 __ std(value, 0, to); 947 __ std(value, 8, to); 948 __ subf_(count, temp, count); // update count 949 __ std(value, 16, to); 950 __ std(value, 24, to); 951 952 __ addi(to, to, 32); 953 __ bge(CCR0, L_fill_32_bytes_loop); 954 955 __ bind(L_check_fill_8_bytes); 956 __ add_(count, temp, count); 957 __ beq(CCR0, L_exit); 958 __ addic_(count, count, -(2 << shift)); 959 __ blt(CCR0, L_fill_4_bytes); 960 961 // 962 // Length is too short, just fill 8 bytes at a time. 963 // 964 Label L_fill_8_bytes_loop; 965 __ bind(L_fill_8_bytes_loop); 966 __ std(value, 0, to); 967 __ addic_(count, count, -(2 << shift)); 968 __ addi(to, to, 8); 969 __ bge(CCR0, L_fill_8_bytes_loop); 970 971 // fill trailing 4 bytes 972 __ bind(L_fill_4_bytes); 973 __ andi_(temp, count, 1<<shift); 974 __ beq(CCR0, L_fill_2_bytes); 975 976 __ stw(value, 0, to); 977 if (t == T_BYTE || t == T_SHORT) { 978 __ addi(to, to, 4); 979 // fill trailing 2 bytes 980 __ bind(L_fill_2_bytes); 981 __ andi_(temp, count, 1<<(shift-1)); 982 __ beq(CCR0, L_fill_byte); 983 __ sth(value, 0, to); 984 if (t == T_BYTE) { 985 __ addi(to, to, 2); 986 // fill trailing byte 987 __ bind(L_fill_byte); 988 __ andi_(count, count, 1); 989 __ beq(CCR0, L_exit); 990 __ stb(value, 0, to); 991 } else { 992 __ bind(L_fill_byte); 993 } 994 } else { 995 __ bind(L_fill_2_bytes); 996 } 997 __ bind(L_exit); 998 __ blr(); 999 1000 // Handle copies less than 8 bytes. Int is handled elsewhere. 1001 if (t == T_BYTE) { 1002 __ bind(L_fill_elements); 1003 Label L_fill_2, L_fill_4; 1004 __ andi_(temp, count, 1); 1005 __ beq(CCR0, L_fill_2); 1006 __ stb(value, 0, to); 1007 __ addi(to, to, 1); 1008 __ bind(L_fill_2); 1009 __ andi_(temp, count, 2); 1010 __ beq(CCR0, L_fill_4); 1011 __ stb(value, 0, to); 1012 __ stb(value, 0, to); 1013 __ addi(to, to, 2); 1014 __ bind(L_fill_4); 1015 __ andi_(temp, count, 4); 1016 __ beq(CCR0, L_exit); 1017 __ stb(value, 0, to); 1018 __ stb(value, 1, to); 1019 __ stb(value, 2, to); 1020 __ stb(value, 3, to); 1021 __ blr(); 1022 } 1023 1024 if (t == T_SHORT) { 1025 Label L_fill_2; 1026 __ bind(L_fill_elements); 1027 __ andi_(temp, count, 1); 1028 __ beq(CCR0, L_fill_2); 1029 __ sth(value, 0, to); 1030 __ addi(to, to, 2); 1031 __ bind(L_fill_2); 1032 __ andi_(temp, count, 2); 1033 __ beq(CCR0, L_exit); 1034 __ sth(value, 0, to); 1035 __ sth(value, 2, to); 1036 __ blr(); 1037 } 1038 return start; 1039 } 1040 1041 1042 // Generate overlap test for array copy stubs 1043 // 1044 // Input: 1045 // R3_ARG1 - from 1046 // R4_ARG2 - to 1047 // R5_ARG3 - element count 1048 // 1049 void array_overlap_test(address no_overlap_target, int log2_elem_size) { 1050 Register tmp1 = R6_ARG4; 1051 Register tmp2 = R7_ARG5; 1052 1053 Label l_overlap; 1054 #ifdef ASSERT 1055 __ srdi_(tmp2, R5_ARG3, 31); 1056 __ asm_assert_eq("missing zero extend", 0xAFFE); 1057 #endif 1058 1059 __ subf(tmp1, R3_ARG1, R4_ARG2); // distance in bytes 1060 __ sldi(tmp2, R5_ARG3, log2_elem_size); // size in bytes 1061 __ cmpld(CCR0, R3_ARG1, R4_ARG2); // Use unsigned comparison! 1062 __ cmpld(CCR1, tmp1, tmp2); 1063 __ crand(/*CCR0 lt*/0, /*CCR1 lt*/4+0, /*CCR0 lt*/0); 1064 __ blt(CCR0, l_overlap); // Src before dst and distance smaller than size. 1065 1066 // need to copy forwards 1067 if (__ is_within_range_of_b(no_overlap_target, __ pc())) { 1068 __ b(no_overlap_target); 1069 } else { 1070 __ load_const(tmp1, no_overlap_target, tmp2); 1071 __ mtctr(tmp1); 1072 __ bctr(); 1073 } 1074 1075 __ bind(l_overlap); 1076 // need to copy backwards 1077 } 1078 1079 // The guideline in the implementations of generate_disjoint_xxx_copy 1080 // (xxx=byte,short,int,long,oop) is to copy as many elements as possible with 1081 // single instructions, but to avoid alignment interrupts (see subsequent 1082 // comment). Furthermore, we try to minimize misaligned access, even 1083 // though they cause no alignment interrupt. 1084 // 1085 // In Big-Endian mode, the PowerPC architecture requires implementations to 1086 // handle automatically misaligned integer halfword and word accesses, 1087 // word-aligned integer doubleword accesses, and word-aligned floating-point 1088 // accesses. Other accesses may or may not generate an Alignment interrupt 1089 // depending on the implementation. 1090 // Alignment interrupt handling may require on the order of hundreds of cycles, 1091 // so every effort should be made to avoid misaligned memory values. 1092 // 1093 // 1094 // Generate stub for disjoint byte copy. If "aligned" is true, the 1095 // "from" and "to" addresses are assumed to be heapword aligned. 1096 // 1097 // Arguments for generated stub: 1098 // from: R3_ARG1 1099 // to: R4_ARG2 1100 // count: R5_ARG3 treated as signed 1101 // 1102 address generate_disjoint_byte_copy(bool aligned, const char * name) { 1103 StubCodeMark mark(this, "StubRoutines", name); 1104 address start = __ emit_fd(); 1105 1106 Register tmp1 = R6_ARG4; 1107 Register tmp2 = R7_ARG5; 1108 Register tmp3 = R8_ARG6; 1109 Register tmp4 = R9_ARG7; 1110 1111 1112 Label l_1, l_2, l_3, l_4, l_5, l_6, l_7, l_8, l_9; 1113 // Don't try anything fancy if arrays don't have many elements. 1114 __ li(tmp3, 0); 1115 __ cmpwi(CCR0, R5_ARG3, 17); 1116 __ ble(CCR0, l_6); // copy 4 at a time 1117 1118 if (!aligned) { 1119 __ xorr(tmp1, R3_ARG1, R4_ARG2); 1120 __ andi_(tmp1, tmp1, 3); 1121 __ bne(CCR0, l_6); // If arrays don't have the same alignment mod 4, do 4 element copy. 1122 1123 // Copy elements if necessary to align to 4 bytes. 1124 __ neg(tmp1, R3_ARG1); // Compute distance to alignment boundary. 1125 __ andi_(tmp1, tmp1, 3); 1126 __ beq(CCR0, l_2); 1127 1128 __ subf(R5_ARG3, tmp1, R5_ARG3); 1129 __ bind(l_9); 1130 __ lbz(tmp2, 0, R3_ARG1); 1131 __ addic_(tmp1, tmp1, -1); 1132 __ stb(tmp2, 0, R4_ARG2); 1133 __ addi(R3_ARG1, R3_ARG1, 1); 1134 __ addi(R4_ARG2, R4_ARG2, 1); 1135 __ bne(CCR0, l_9); 1136 1137 __ bind(l_2); 1138 } 1139 1140 // copy 8 elements at a time 1141 __ xorr(tmp2, R3_ARG1, R4_ARG2); // skip if src & dest have differing alignment mod 8 1142 __ andi_(tmp1, tmp2, 7); 1143 __ bne(CCR0, l_7); // not same alignment -> to or from is aligned -> copy 8 1144 1145 // copy a 2-element word if necessary to align to 8 bytes 1146 __ andi_(R0, R3_ARG1, 7); 1147 __ beq(CCR0, l_7); 1148 1149 __ lwzx(tmp2, R3_ARG1, tmp3); 1150 __ addi(R5_ARG3, R5_ARG3, -4); 1151 __ stwx(tmp2, R4_ARG2, tmp3); 1152 { // FasterArrayCopy 1153 __ addi(R3_ARG1, R3_ARG1, 4); 1154 __ addi(R4_ARG2, R4_ARG2, 4); 1155 } 1156 __ bind(l_7); 1157 1158 { // FasterArrayCopy 1159 __ cmpwi(CCR0, R5_ARG3, 31); 1160 __ ble(CCR0, l_6); // copy 2 at a time if less than 32 elements remain 1161 1162 __ srdi(tmp1, R5_ARG3, 5); 1163 __ andi_(R5_ARG3, R5_ARG3, 31); 1164 __ mtctr(tmp1); 1165 1166 __ bind(l_8); 1167 // Use unrolled version for mass copying (copy 32 elements a time) 1168 // Load feeding store gets zero latency on Power6, however not on Power5. 1169 // Therefore, the following sequence is made for the good of both. 1170 __ ld(tmp1, 0, R3_ARG1); 1171 __ ld(tmp2, 8, R3_ARG1); 1172 __ ld(tmp3, 16, R3_ARG1); 1173 __ ld(tmp4, 24, R3_ARG1); 1174 __ std(tmp1, 0, R4_ARG2); 1175 __ std(tmp2, 8, R4_ARG2); 1176 __ std(tmp3, 16, R4_ARG2); 1177 __ std(tmp4, 24, R4_ARG2); 1178 __ addi(R3_ARG1, R3_ARG1, 32); 1179 __ addi(R4_ARG2, R4_ARG2, 32); 1180 __ bdnz(l_8); 1181 } 1182 1183 __ bind(l_6); 1184 1185 // copy 4 elements at a time 1186 __ cmpwi(CCR0, R5_ARG3, 4); 1187 __ blt(CCR0, l_1); 1188 __ srdi(tmp1, R5_ARG3, 2); 1189 __ mtctr(tmp1); // is > 0 1190 __ andi_(R5_ARG3, R5_ARG3, 3); 1191 1192 { // FasterArrayCopy 1193 __ addi(R3_ARG1, R3_ARG1, -4); 1194 __ addi(R4_ARG2, R4_ARG2, -4); 1195 __ bind(l_3); 1196 __ lwzu(tmp2, 4, R3_ARG1); 1197 __ stwu(tmp2, 4, R4_ARG2); 1198 __ bdnz(l_3); 1199 __ addi(R3_ARG1, R3_ARG1, 4); 1200 __ addi(R4_ARG2, R4_ARG2, 4); 1201 } 1202 1203 // do single element copy 1204 __ bind(l_1); 1205 __ cmpwi(CCR0, R5_ARG3, 0); 1206 __ beq(CCR0, l_4); 1207 1208 { // FasterArrayCopy 1209 __ mtctr(R5_ARG3); 1210 __ addi(R3_ARG1, R3_ARG1, -1); 1211 __ addi(R4_ARG2, R4_ARG2, -1); 1212 1213 __ bind(l_5); 1214 __ lbzu(tmp2, 1, R3_ARG1); 1215 __ stbu(tmp2, 1, R4_ARG2); 1216 __ bdnz(l_5); 1217 } 1218 1219 __ bind(l_4); 1220 __ blr(); 1221 1222 return start; 1223 } 1224 1225 // Generate stub for conjoint byte copy. If "aligned" is true, the 1226 // "from" and "to" addresses are assumed to be heapword aligned. 1227 // 1228 // Arguments for generated stub: 1229 // from: R3_ARG1 1230 // to: R4_ARG2 1231 // count: R5_ARG3 treated as signed 1232 // 1233 address generate_conjoint_byte_copy(bool aligned, const char * name) { 1234 StubCodeMark mark(this, "StubRoutines", name); 1235 address start = __ emit_fd(); 1236 1237 Register tmp1 = R6_ARG4; 1238 Register tmp2 = R7_ARG5; 1239 Register tmp3 = R8_ARG6; 1240 1241 address nooverlap_target = aligned ? 1242 ((FunctionDescriptor*)StubRoutines::arrayof_jbyte_disjoint_arraycopy())->entry() : 1243 ((FunctionDescriptor*)StubRoutines::jbyte_disjoint_arraycopy())->entry(); 1244 1245 array_overlap_test(nooverlap_target, 0); 1246 // Do reverse copy. We assume the case of actual overlap is rare enough 1247 // that we don't have to optimize it. 1248 Label l_1, l_2; 1249 1250 __ b(l_2); 1251 __ bind(l_1); 1252 __ stbx(tmp1, R4_ARG2, R5_ARG3); 1253 __ bind(l_2); 1254 __ addic_(R5_ARG3, R5_ARG3, -1); 1255 __ lbzx(tmp1, R3_ARG1, R5_ARG3); 1256 __ bge(CCR0, l_1); 1257 1258 __ blr(); 1259 1260 return start; 1261 } 1262 1263 // Generate stub for disjoint short copy. If "aligned" is true, the 1264 // "from" and "to" addresses are assumed to be heapword aligned. 1265 // 1266 // Arguments for generated stub: 1267 // from: R3_ARG1 1268 // to: R4_ARG2 1269 // elm.count: R5_ARG3 treated as signed 1270 // 1271 // Strategy for aligned==true: 1272 // 1273 // If length <= 9: 1274 // 1. copy 2 elements at a time (l_6) 1275 // 2. copy last element if original element count was odd (l_1) 1276 // 1277 // If length > 9: 1278 // 1. copy 4 elements at a time until less than 4 elements are left (l_7) 1279 // 2. copy 2 elements at a time until less than 2 elements are left (l_6) 1280 // 3. copy last element if one was left in step 2. (l_1) 1281 // 1282 // 1283 // Strategy for aligned==false: 1284 // 1285 // If length <= 9: same as aligned==true case, but NOTE: load/stores 1286 // can be unaligned (see comment below) 1287 // 1288 // If length > 9: 1289 // 1. continue with step 6. if the alignment of from and to mod 4 1290 // is different. 1291 // 2. align from and to to 4 bytes by copying 1 element if necessary 1292 // 3. at l_2 from and to are 4 byte aligned; continue with 1293 // 5. if they cannot be aligned to 8 bytes because they have 1294 // got different alignment mod 8. 1295 // 4. at this point we know that both, from and to, have the same 1296 // alignment mod 8, now copy one element if necessary to get 1297 // 8 byte alignment of from and to. 1298 // 5. copy 4 elements at a time until less than 4 elements are 1299 // left; depending on step 3. all load/stores are aligned or 1300 // either all loads or all stores are unaligned. 1301 // 6. copy 2 elements at a time until less than 2 elements are 1302 // left (l_6); arriving here from step 1., there is a chance 1303 // that all accesses are unaligned. 1304 // 7. copy last element if one was left in step 6. (l_1) 1305 // 1306 // There are unaligned data accesses using integer load/store 1307 // instructions in this stub. POWER allows such accesses. 1308 // 1309 // According to the manuals (PowerISA_V2.06_PUBLIC, Book II, 1310 // Chapter 2: Effect of Operand Placement on Performance) unaligned 1311 // integer load/stores have good performance. Only unaligned 1312 // floating point load/stores can have poor performance. 1313 // 1314 // TODO: 1315 // 1316 // 1. check if aligning the backbranch target of loops is beneficial 1317 // 1318 address generate_disjoint_short_copy(bool aligned, const char * name) { 1319 StubCodeMark mark(this, "StubRoutines", name); 1320 1321 Register tmp1 = R6_ARG4; 1322 Register tmp2 = R7_ARG5; 1323 Register tmp3 = R8_ARG6; 1324 Register tmp4 = R9_ARG7; 1325 1326 address start = __ emit_fd(); 1327 1328 Label l_1, l_2, l_3, l_4, l_5, l_6, l_7, l_8; 1329 // don't try anything fancy if arrays don't have many elements 1330 __ li(tmp3, 0); 1331 __ cmpwi(CCR0, R5_ARG3, 9); 1332 __ ble(CCR0, l_6); // copy 2 at a time 1333 1334 if (!aligned) { 1335 __ xorr(tmp1, R3_ARG1, R4_ARG2); 1336 __ andi_(tmp1, tmp1, 3); 1337 __ bne(CCR0, l_6); // if arrays don't have the same alignment mod 4, do 2 element copy 1338 1339 // At this point it is guaranteed that both, from and to have the same alignment mod 4. 1340 1341 // Copy 1 element if necessary to align to 4 bytes. 1342 __ andi_(tmp1, R3_ARG1, 3); 1343 __ beq(CCR0, l_2); 1344 1345 __ lhz(tmp2, 0, R3_ARG1); 1346 __ addi(R3_ARG1, R3_ARG1, 2); 1347 __ sth(tmp2, 0, R4_ARG2); 1348 __ addi(R4_ARG2, R4_ARG2, 2); 1349 __ addi(R5_ARG3, R5_ARG3, -1); 1350 __ bind(l_2); 1351 1352 // At this point the positions of both, from and to, are at least 4 byte aligned. 1353 1354 // Copy 4 elements at a time. 1355 // Align to 8 bytes, but only if both, from and to, have same alignment mod 8. 1356 __ xorr(tmp2, R3_ARG1, R4_ARG2); 1357 __ andi_(tmp1, tmp2, 7); 1358 __ bne(CCR0, l_7); // not same alignment mod 8 -> copy 4, either from or to will be unaligned 1359 1360 // Copy a 2-element word if necessary to align to 8 bytes. 1361 __ andi_(R0, R3_ARG1, 7); 1362 __ beq(CCR0, l_7); 1363 1364 __ lwzx(tmp2, R3_ARG1, tmp3); 1365 __ addi(R5_ARG3, R5_ARG3, -2); 1366 __ stwx(tmp2, R4_ARG2, tmp3); 1367 { // FasterArrayCopy 1368 __ addi(R3_ARG1, R3_ARG1, 4); 1369 __ addi(R4_ARG2, R4_ARG2, 4); 1370 } 1371 } 1372 1373 __ bind(l_7); 1374 1375 // Copy 4 elements at a time; either the loads or the stores can 1376 // be unaligned if aligned == false. 1377 1378 { // FasterArrayCopy 1379 __ cmpwi(CCR0, R5_ARG3, 15); 1380 __ ble(CCR0, l_6); // copy 2 at a time if less than 16 elements remain 1381 1382 __ srdi(tmp1, R5_ARG3, 4); 1383 __ andi_(R5_ARG3, R5_ARG3, 15); 1384 __ mtctr(tmp1); 1385 1386 __ bind(l_8); 1387 // Use unrolled version for mass copying (copy 16 elements a time). 1388 // Load feeding store gets zero latency on Power6, however not on Power5. 1389 // Therefore, the following sequence is made for the good of both. 1390 __ ld(tmp1, 0, R3_ARG1); 1391 __ ld(tmp2, 8, R3_ARG1); 1392 __ ld(tmp3, 16, R3_ARG1); 1393 __ ld(tmp4, 24, R3_ARG1); 1394 __ std(tmp1, 0, R4_ARG2); 1395 __ std(tmp2, 8, R4_ARG2); 1396 __ std(tmp3, 16, R4_ARG2); 1397 __ std(tmp4, 24, R4_ARG2); 1398 __ addi(R3_ARG1, R3_ARG1, 32); 1399 __ addi(R4_ARG2, R4_ARG2, 32); 1400 __ bdnz(l_8); 1401 } 1402 __ bind(l_6); 1403 1404 // copy 2 elements at a time 1405 { // FasterArrayCopy 1406 __ cmpwi(CCR0, R5_ARG3, 2); 1407 __ blt(CCR0, l_1); 1408 __ srdi(tmp1, R5_ARG3, 1); 1409 __ andi_(R5_ARG3, R5_ARG3, 1); 1410 1411 __ addi(R3_ARG1, R3_ARG1, -4); 1412 __ addi(R4_ARG2, R4_ARG2, -4); 1413 __ mtctr(tmp1); 1414 1415 __ bind(l_3); 1416 __ lwzu(tmp2, 4, R3_ARG1); 1417 __ stwu(tmp2, 4, R4_ARG2); 1418 __ bdnz(l_3); 1419 1420 __ addi(R3_ARG1, R3_ARG1, 4); 1421 __ addi(R4_ARG2, R4_ARG2, 4); 1422 } 1423 1424 // do single element copy 1425 __ bind(l_1); 1426 __ cmpwi(CCR0, R5_ARG3, 0); 1427 __ beq(CCR0, l_4); 1428 1429 { // FasterArrayCopy 1430 __ mtctr(R5_ARG3); 1431 __ addi(R3_ARG1, R3_ARG1, -2); 1432 __ addi(R4_ARG2, R4_ARG2, -2); 1433 1434 __ bind(l_5); 1435 __ lhzu(tmp2, 2, R3_ARG1); 1436 __ sthu(tmp2, 2, R4_ARG2); 1437 __ bdnz(l_5); 1438 } 1439 __ bind(l_4); 1440 __ blr(); 1441 1442 return start; 1443 } 1444 1445 // Generate stub for conjoint short copy. If "aligned" is true, the 1446 // "from" and "to" addresses are assumed to be heapword aligned. 1447 // 1448 // Arguments for generated stub: 1449 // from: R3_ARG1 1450 // to: R4_ARG2 1451 // count: R5_ARG3 treated as signed 1452 // 1453 address generate_conjoint_short_copy(bool aligned, const char * name) { 1454 StubCodeMark mark(this, "StubRoutines", name); 1455 address start = __ emit_fd(); 1456 1457 Register tmp1 = R6_ARG4; 1458 Register tmp2 = R7_ARG5; 1459 Register tmp3 = R8_ARG6; 1460 1461 address nooverlap_target = aligned ? 1462 ((FunctionDescriptor*)StubRoutines::arrayof_jshort_disjoint_arraycopy())->entry() : 1463 ((FunctionDescriptor*)StubRoutines::jshort_disjoint_arraycopy())->entry(); 1464 1465 array_overlap_test(nooverlap_target, 1); 1466 1467 Label l_1, l_2; 1468 __ sldi(tmp1, R5_ARG3, 1); 1469 __ b(l_2); 1470 __ bind(l_1); 1471 __ sthx(tmp2, R4_ARG2, tmp1); 1472 __ bind(l_2); 1473 __ addic_(tmp1, tmp1, -2); 1474 __ lhzx(tmp2, R3_ARG1, tmp1); 1475 __ bge(CCR0, l_1); 1476 1477 __ blr(); 1478 1479 return start; 1480 } 1481 1482 // Generate core code for disjoint int copy (and oop copy on 32-bit). If "aligned" 1483 // is true, the "from" and "to" addresses are assumed to be heapword aligned. 1484 // 1485 // Arguments: 1486 // from: R3_ARG1 1487 // to: R4_ARG2 1488 // count: R5_ARG3 treated as signed 1489 // 1490 void generate_disjoint_int_copy_core(bool aligned) { 1491 Register tmp1 = R6_ARG4; 1492 Register tmp2 = R7_ARG5; 1493 Register tmp3 = R8_ARG6; 1494 Register tmp4 = R0; 1495 1496 Label l_1, l_2, l_3, l_4, l_5, l_6; 1497 // for short arrays, just do single element copy 1498 __ li(tmp3, 0); 1499 __ cmpwi(CCR0, R5_ARG3, 5); 1500 __ ble(CCR0, l_2); 1501 1502 if (!aligned) { 1503 // check if arrays have same alignment mod 8. 1504 __ xorr(tmp1, R3_ARG1, R4_ARG2); 1505 __ andi_(R0, tmp1, 7); 1506 // Not the same alignment, but ld and std just need to be 4 byte aligned. 1507 __ bne(CCR0, l_4); // to OR from is 8 byte aligned -> copy 2 at a time 1508 1509 // copy 1 element to align to and from on an 8 byte boundary 1510 __ andi_(R0, R3_ARG1, 7); 1511 __ beq(CCR0, l_4); 1512 1513 __ lwzx(tmp2, R3_ARG1, tmp3); 1514 __ addi(R5_ARG3, R5_ARG3, -1); 1515 __ stwx(tmp2, R4_ARG2, tmp3); 1516 { // FasterArrayCopy 1517 __ addi(R3_ARG1, R3_ARG1, 4); 1518 __ addi(R4_ARG2, R4_ARG2, 4); 1519 } 1520 __ bind(l_4); 1521 } 1522 1523 { // FasterArrayCopy 1524 __ cmpwi(CCR0, R5_ARG3, 7); 1525 __ ble(CCR0, l_2); // copy 1 at a time if less than 8 elements remain 1526 1527 __ srdi(tmp1, R5_ARG3, 3); 1528 __ andi_(R5_ARG3, R5_ARG3, 7); 1529 __ mtctr(tmp1); 1530 1531 __ bind(l_6); 1532 // Use unrolled version for mass copying (copy 8 elements a time). 1533 // Load feeding store gets zero latency on power6, however not on power 5. 1534 // Therefore, the following sequence is made for the good of both. 1535 __ ld(tmp1, 0, R3_ARG1); 1536 __ ld(tmp2, 8, R3_ARG1); 1537 __ ld(tmp3, 16, R3_ARG1); 1538 __ ld(tmp4, 24, R3_ARG1); 1539 __ std(tmp1, 0, R4_ARG2); 1540 __ std(tmp2, 8, R4_ARG2); 1541 __ std(tmp3, 16, R4_ARG2); 1542 __ std(tmp4, 24, R4_ARG2); 1543 __ addi(R3_ARG1, R3_ARG1, 32); 1544 __ addi(R4_ARG2, R4_ARG2, 32); 1545 __ bdnz(l_6); 1546 } 1547 1548 // copy 1 element at a time 1549 __ bind(l_2); 1550 __ cmpwi(CCR0, R5_ARG3, 0); 1551 __ beq(CCR0, l_1); 1552 1553 { // FasterArrayCopy 1554 __ mtctr(R5_ARG3); 1555 __ addi(R3_ARG1, R3_ARG1, -4); 1556 __ addi(R4_ARG2, R4_ARG2, -4); 1557 1558 __ bind(l_3); 1559 __ lwzu(tmp2, 4, R3_ARG1); 1560 __ stwu(tmp2, 4, R4_ARG2); 1561 __ bdnz(l_3); 1562 } 1563 1564 __ bind(l_1); 1565 return; 1566 } 1567 1568 // Generate stub for disjoint int copy. If "aligned" is true, the 1569 // "from" and "to" addresses are assumed to be heapword aligned. 1570 // 1571 // Arguments for generated stub: 1572 // from: R3_ARG1 1573 // to: R4_ARG2 1574 // count: R5_ARG3 treated as signed 1575 // 1576 address generate_disjoint_int_copy(bool aligned, const char * name) { 1577 StubCodeMark mark(this, "StubRoutines", name); 1578 address start = __ emit_fd(); 1579 generate_disjoint_int_copy_core(aligned); 1580 __ blr(); 1581 return start; 1582 } 1583 1584 // Generate core code for conjoint int copy (and oop copy on 1585 // 32-bit). If "aligned" is true, the "from" and "to" addresses 1586 // are assumed to be heapword aligned. 1587 // 1588 // Arguments: 1589 // from: R3_ARG1 1590 // to: R4_ARG2 1591 // count: R5_ARG3 treated as signed 1592 // 1593 void generate_conjoint_int_copy_core(bool aligned) { 1594 // Do reverse copy. We assume the case of actual overlap is rare enough 1595 // that we don't have to optimize it. 1596 1597 Label l_1, l_2, l_3, l_4, l_5, l_6; 1598 1599 Register tmp1 = R6_ARG4; 1600 Register tmp2 = R7_ARG5; 1601 Register tmp3 = R8_ARG6; 1602 Register tmp4 = R0; 1603 1604 { // FasterArrayCopy 1605 __ cmpwi(CCR0, R5_ARG3, 0); 1606 __ beq(CCR0, l_6); 1607 1608 __ sldi(R5_ARG3, R5_ARG3, 2); 1609 __ add(R3_ARG1, R3_ARG1, R5_ARG3); 1610 __ add(R4_ARG2, R4_ARG2, R5_ARG3); 1611 __ srdi(R5_ARG3, R5_ARG3, 2); 1612 1613 __ cmpwi(CCR0, R5_ARG3, 7); 1614 __ ble(CCR0, l_5); // copy 1 at a time if less than 8 elements remain 1615 1616 __ srdi(tmp1, R5_ARG3, 3); 1617 __ andi(R5_ARG3, R5_ARG3, 7); 1618 __ mtctr(tmp1); 1619 1620 __ bind(l_4); 1621 // Use unrolled version for mass copying (copy 4 elements a time). 1622 // Load feeding store gets zero latency on Power6, however not on Power5. 1623 // Therefore, the following sequence is made for the good of both. 1624 __ addi(R3_ARG1, R3_ARG1, -32); 1625 __ addi(R4_ARG2, R4_ARG2, -32); 1626 __ ld(tmp4, 24, R3_ARG1); 1627 __ ld(tmp3, 16, R3_ARG1); 1628 __ ld(tmp2, 8, R3_ARG1); 1629 __ ld(tmp1, 0, R3_ARG1); 1630 __ std(tmp4, 24, R4_ARG2); 1631 __ std(tmp3, 16, R4_ARG2); 1632 __ std(tmp2, 8, R4_ARG2); 1633 __ std(tmp1, 0, R4_ARG2); 1634 __ bdnz(l_4); 1635 1636 __ cmpwi(CCR0, R5_ARG3, 0); 1637 __ beq(CCR0, l_6); 1638 1639 __ bind(l_5); 1640 __ mtctr(R5_ARG3); 1641 __ bind(l_3); 1642 __ lwz(R0, -4, R3_ARG1); 1643 __ stw(R0, -4, R4_ARG2); 1644 __ addi(R3_ARG1, R3_ARG1, -4); 1645 __ addi(R4_ARG2, R4_ARG2, -4); 1646 __ bdnz(l_3); 1647 1648 __ bind(l_6); 1649 } 1650 } 1651 1652 // Generate stub for conjoint int copy. If "aligned" is true, the 1653 // "from" and "to" addresses are assumed to be heapword aligned. 1654 // 1655 // Arguments for generated stub: 1656 // from: R3_ARG1 1657 // to: R4_ARG2 1658 // count: R5_ARG3 treated as signed 1659 // 1660 address generate_conjoint_int_copy(bool aligned, const char * name) { 1661 StubCodeMark mark(this, "StubRoutines", name); 1662 address start = __ emit_fd(); 1663 1664 address nooverlap_target = aligned ? 1665 ((FunctionDescriptor*)StubRoutines::arrayof_jint_disjoint_arraycopy())->entry() : 1666 ((FunctionDescriptor*)StubRoutines::jint_disjoint_arraycopy())->entry(); 1667 1668 array_overlap_test(nooverlap_target, 2); 1669 1670 generate_conjoint_int_copy_core(aligned); 1671 1672 __ blr(); 1673 1674 return start; 1675 } 1676 1677 // Generate core code for disjoint long copy (and oop copy on 1678 // 64-bit). If "aligned" is true, the "from" and "to" addresses 1679 // are assumed to be heapword aligned. 1680 // 1681 // Arguments: 1682 // from: R3_ARG1 1683 // to: R4_ARG2 1684 // count: R5_ARG3 treated as signed 1685 // 1686 void generate_disjoint_long_copy_core(bool aligned) { 1687 Register tmp1 = R6_ARG4; 1688 Register tmp2 = R7_ARG5; 1689 Register tmp3 = R8_ARG6; 1690 Register tmp4 = R0; 1691 1692 Label l_1, l_2, l_3, l_4; 1693 1694 { // FasterArrayCopy 1695 __ cmpwi(CCR0, R5_ARG3, 3); 1696 __ ble(CCR0, l_3); // copy 1 at a time if less than 4 elements remain 1697 1698 __ srdi(tmp1, R5_ARG3, 2); 1699 __ andi_(R5_ARG3, R5_ARG3, 3); 1700 __ mtctr(tmp1); 1701 1702 __ bind(l_4); 1703 // Use unrolled version for mass copying (copy 4 elements a time). 1704 // Load feeding store gets zero latency on Power6, however not on Power5. 1705 // Therefore, the following sequence is made for the good of both. 1706 __ ld(tmp1, 0, R3_ARG1); 1707 __ ld(tmp2, 8, R3_ARG1); 1708 __ ld(tmp3, 16, R3_ARG1); 1709 __ ld(tmp4, 24, R3_ARG1); 1710 __ std(tmp1, 0, R4_ARG2); 1711 __ std(tmp2, 8, R4_ARG2); 1712 __ std(tmp3, 16, R4_ARG2); 1713 __ std(tmp4, 24, R4_ARG2); 1714 __ addi(R3_ARG1, R3_ARG1, 32); 1715 __ addi(R4_ARG2, R4_ARG2, 32); 1716 __ bdnz(l_4); 1717 } 1718 1719 // copy 1 element at a time 1720 __ bind(l_3); 1721 __ cmpwi(CCR0, R5_ARG3, 0); 1722 __ beq(CCR0, l_1); 1723 1724 { // FasterArrayCopy 1725 __ mtctr(R5_ARG3); 1726 __ addi(R3_ARG1, R3_ARG1, -8); 1727 __ addi(R4_ARG2, R4_ARG2, -8); 1728 1729 __ bind(l_2); 1730 __ ldu(R0, 8, R3_ARG1); 1731 __ stdu(R0, 8, R4_ARG2); 1732 __ bdnz(l_2); 1733 1734 } 1735 __ bind(l_1); 1736 } 1737 1738 // Generate stub for disjoint long copy. If "aligned" is true, the 1739 // "from" and "to" addresses are assumed to be heapword aligned. 1740 // 1741 // Arguments for generated stub: 1742 // from: R3_ARG1 1743 // to: R4_ARG2 1744 // count: R5_ARG3 treated as signed 1745 // 1746 address generate_disjoint_long_copy(bool aligned, const char * name) { 1747 StubCodeMark mark(this, "StubRoutines", name); 1748 address start = __ emit_fd(); 1749 generate_disjoint_long_copy_core(aligned); 1750 __ blr(); 1751 1752 return start; 1753 } 1754 1755 // Generate core code for conjoint long copy (and oop copy on 1756 // 64-bit). If "aligned" is true, the "from" and "to" addresses 1757 // are assumed to be heapword aligned. 1758 // 1759 // Arguments: 1760 // from: R3_ARG1 1761 // to: R4_ARG2 1762 // count: R5_ARG3 treated as signed 1763 // 1764 void generate_conjoint_long_copy_core(bool aligned) { 1765 Register tmp1 = R6_ARG4; 1766 Register tmp2 = R7_ARG5; 1767 Register tmp3 = R8_ARG6; 1768 Register tmp4 = R0; 1769 1770 Label l_1, l_2, l_3, l_4, l_5; 1771 1772 __ cmpwi(CCR0, R5_ARG3, 0); 1773 __ beq(CCR0, l_1); 1774 1775 { // FasterArrayCopy 1776 __ sldi(R5_ARG3, R5_ARG3, 3); 1777 __ add(R3_ARG1, R3_ARG1, R5_ARG3); 1778 __ add(R4_ARG2, R4_ARG2, R5_ARG3); 1779 __ srdi(R5_ARG3, R5_ARG3, 3); 1780 1781 __ cmpwi(CCR0, R5_ARG3, 3); 1782 __ ble(CCR0, l_5); // copy 1 at a time if less than 4 elements remain 1783 1784 __ srdi(tmp1, R5_ARG3, 2); 1785 __ andi(R5_ARG3, R5_ARG3, 3); 1786 __ mtctr(tmp1); 1787 1788 __ bind(l_4); 1789 // Use unrolled version for mass copying (copy 4 elements a time). 1790 // Load feeding store gets zero latency on Power6, however not on Power5. 1791 // Therefore, the following sequence is made for the good of both. 1792 __ addi(R3_ARG1, R3_ARG1, -32); 1793 __ addi(R4_ARG2, R4_ARG2, -32); 1794 __ ld(tmp4, 24, R3_ARG1); 1795 __ ld(tmp3, 16, R3_ARG1); 1796 __ ld(tmp2, 8, R3_ARG1); 1797 __ ld(tmp1, 0, R3_ARG1); 1798 __ std(tmp4, 24, R4_ARG2); 1799 __ std(tmp3, 16, R4_ARG2); 1800 __ std(tmp2, 8, R4_ARG2); 1801 __ std(tmp1, 0, R4_ARG2); 1802 __ bdnz(l_4); 1803 1804 __ cmpwi(CCR0, R5_ARG3, 0); 1805 __ beq(CCR0, l_1); 1806 1807 __ bind(l_5); 1808 __ mtctr(R5_ARG3); 1809 __ bind(l_3); 1810 __ ld(R0, -8, R3_ARG1); 1811 __ std(R0, -8, R4_ARG2); 1812 __ addi(R3_ARG1, R3_ARG1, -8); 1813 __ addi(R4_ARG2, R4_ARG2, -8); 1814 __ bdnz(l_3); 1815 1816 } 1817 __ bind(l_1); 1818 } 1819 1820 // Generate stub for conjoint long copy. If "aligned" is true, the 1821 // "from" and "to" addresses are assumed to be heapword aligned. 1822 // 1823 // Arguments for generated stub: 1824 // from: R3_ARG1 1825 // to: R4_ARG2 1826 // count: R5_ARG3 treated as signed 1827 // 1828 address generate_conjoint_long_copy(bool aligned, const char * name) { 1829 StubCodeMark mark(this, "StubRoutines", name); 1830 address start = __ emit_fd(); 1831 1832 address nooverlap_target = aligned ? 1833 ((FunctionDescriptor*)StubRoutines::arrayof_jlong_disjoint_arraycopy())->entry() : 1834 ((FunctionDescriptor*)StubRoutines::jlong_disjoint_arraycopy())->entry(); 1835 1836 array_overlap_test(nooverlap_target, 3); 1837 generate_conjoint_long_copy_core(aligned); 1838 1839 __ blr(); 1840 1841 return start; 1842 } 1843 1844 // Generate stub for conjoint oop copy. If "aligned" is true, the 1845 // "from" and "to" addresses are assumed to be heapword aligned. 1846 // 1847 // Arguments for generated stub: 1848 // from: R3_ARG1 1849 // to: R4_ARG2 1850 // count: R5_ARG3 treated as signed 1851 // dest_uninitialized: G1 support 1852 // 1853 address generate_conjoint_oop_copy(bool aligned, const char * name, bool dest_uninitialized) { 1854 StubCodeMark mark(this, "StubRoutines", name); 1855 1856 address start = __ emit_fd(); 1857 1858 address nooverlap_target = aligned ? 1859 ((FunctionDescriptor*)StubRoutines::arrayof_oop_disjoint_arraycopy())->entry() : 1860 ((FunctionDescriptor*)StubRoutines::oop_disjoint_arraycopy())->entry(); 1861 1862 gen_write_ref_array_pre_barrier(R3_ARG1, R4_ARG2, R5_ARG3, dest_uninitialized, R9_ARG7); 1863 1864 // Save arguments. 1865 __ mr(R9_ARG7, R4_ARG2); 1866 __ mr(R10_ARG8, R5_ARG3); 1867 1868 if (UseCompressedOops) { 1869 array_overlap_test(nooverlap_target, 2); 1870 generate_conjoint_int_copy_core(aligned); 1871 } else { 1872 array_overlap_test(nooverlap_target, 3); 1873 generate_conjoint_long_copy_core(aligned); 1874 } 1875 1876 gen_write_ref_array_post_barrier(R9_ARG7, R10_ARG8, R11_scratch1); 1877 1878 __ blr(); 1879 1880 return start; 1881 } 1882 1883 // Generate stub for disjoint oop copy. If "aligned" is true, the 1884 // "from" and "to" addresses are assumed to be heapword aligned. 1885 // 1886 // Arguments for generated stub: 1887 // from: R3_ARG1 1888 // to: R4_ARG2 1889 // count: R5_ARG3 treated as signed 1890 // dest_uninitialized: G1 support 1891 // 1892 address generate_disjoint_oop_copy(bool aligned, const char * name, bool dest_uninitialized) { 1893 StubCodeMark mark(this, "StubRoutines", name); 1894 address start = __ emit_fd(); 1895 1896 gen_write_ref_array_pre_barrier(R3_ARG1, R4_ARG2, R5_ARG3, dest_uninitialized, R9_ARG7); 1897 1898 // save some arguments, disjoint_long_copy_core destroys them. 1899 // needed for post barrier 1900 __ mr(R9_ARG7, R4_ARG2); 1901 __ mr(R10_ARG8, R5_ARG3); 1902 1903 if (UseCompressedOops) { 1904 generate_disjoint_int_copy_core(aligned); 1905 } else { 1906 generate_disjoint_long_copy_core(aligned); 1907 } 1908 1909 gen_write_ref_array_post_barrier(R9_ARG7, R10_ARG8, R11_scratch1); 1910 1911 __ blr(); 1912 1913 return start; 1914 } 1915 1916 void generate_arraycopy_stubs() { 1917 // Note: the disjoint stubs must be generated first, some of 1918 // the conjoint stubs use them. 1919 1920 // non-aligned disjoint versions 1921 StubRoutines::_jbyte_disjoint_arraycopy = generate_disjoint_byte_copy(false, "jbyte_disjoint_arraycopy"); 1922 StubRoutines::_jshort_disjoint_arraycopy = generate_disjoint_short_copy(false, "jshort_disjoint_arraycopy"); 1923 StubRoutines::_jint_disjoint_arraycopy = generate_disjoint_int_copy(false, "jint_disjoint_arraycopy"); 1924 StubRoutines::_jlong_disjoint_arraycopy = generate_disjoint_long_copy(false, "jlong_disjoint_arraycopy"); 1925 StubRoutines::_oop_disjoint_arraycopy = generate_disjoint_oop_copy(false, "oop_disjoint_arraycopy", false); 1926 StubRoutines::_oop_disjoint_arraycopy_uninit = generate_disjoint_oop_copy(false, "oop_disjoint_arraycopy_uninit", true); 1927 1928 // aligned disjoint versions 1929 StubRoutines::_arrayof_jbyte_disjoint_arraycopy = generate_disjoint_byte_copy(true, "arrayof_jbyte_disjoint_arraycopy"); 1930 StubRoutines::_arrayof_jshort_disjoint_arraycopy = generate_disjoint_short_copy(true, "arrayof_jshort_disjoint_arraycopy"); 1931 StubRoutines::_arrayof_jint_disjoint_arraycopy = generate_disjoint_int_copy(true, "arrayof_jint_disjoint_arraycopy"); 1932 StubRoutines::_arrayof_jlong_disjoint_arraycopy = generate_disjoint_long_copy(true, "arrayof_jlong_disjoint_arraycopy"); 1933 StubRoutines::_arrayof_oop_disjoint_arraycopy = generate_disjoint_oop_copy(true, "arrayof_oop_disjoint_arraycopy", false); 1934 StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit = generate_disjoint_oop_copy(true, "oop_disjoint_arraycopy_uninit", true); 1935 1936 // non-aligned conjoint versions 1937 StubRoutines::_jbyte_arraycopy = generate_conjoint_byte_copy(false, "jbyte_arraycopy"); 1938 StubRoutines::_jshort_arraycopy = generate_conjoint_short_copy(false, "jshort_arraycopy"); 1939 StubRoutines::_jint_arraycopy = generate_conjoint_int_copy(false, "jint_arraycopy"); 1940 StubRoutines::_jlong_arraycopy = generate_conjoint_long_copy(false, "jlong_arraycopy"); 1941 StubRoutines::_oop_arraycopy = generate_conjoint_oop_copy(false, "oop_arraycopy", false); 1942 StubRoutines::_oop_arraycopy_uninit = generate_conjoint_oop_copy(false, "oop_arraycopy_uninit", true); 1943 1944 // aligned conjoint versions 1945 StubRoutines::_arrayof_jbyte_arraycopy = generate_conjoint_byte_copy(true, "arrayof_jbyte_arraycopy"); 1946 StubRoutines::_arrayof_jshort_arraycopy = generate_conjoint_short_copy(true, "arrayof_jshort_arraycopy"); 1947 StubRoutines::_arrayof_jint_arraycopy = generate_conjoint_int_copy(true, "arrayof_jint_arraycopy"); 1948 StubRoutines::_arrayof_jlong_arraycopy = generate_conjoint_long_copy(true, "arrayof_jlong_arraycopy"); 1949 StubRoutines::_arrayof_oop_arraycopy = generate_conjoint_oop_copy(true, "arrayof_oop_arraycopy", false); 1950 StubRoutines::_arrayof_oop_arraycopy_uninit = generate_conjoint_oop_copy(true, "arrayof_oop_arraycopy", true); 1951 1952 // fill routines 1953 StubRoutines::_jbyte_fill = generate_fill(T_BYTE, false, "jbyte_fill"); 1954 StubRoutines::_jshort_fill = generate_fill(T_SHORT, false, "jshort_fill"); 1955 StubRoutines::_jint_fill = generate_fill(T_INT, false, "jint_fill"); 1956 StubRoutines::_arrayof_jbyte_fill = generate_fill(T_BYTE, true, "arrayof_jbyte_fill"); 1957 StubRoutines::_arrayof_jshort_fill = generate_fill(T_SHORT, true, "arrayof_jshort_fill"); 1958 StubRoutines::_arrayof_jint_fill = generate_fill(T_INT, true, "arrayof_jint_fill"); 1959 } 1960 1961 // Safefetch stubs. 1962 void generate_safefetch(const char* name, int size, address* entry, address* fault_pc, address* continuation_pc) { 1963 // safefetch signatures: 1964 // int SafeFetch32(int* adr, int errValue); 1965 // intptr_t SafeFetchN (intptr_t* adr, intptr_t errValue); 1966 // 1967 // arguments: 1968 // R3_ARG1 = adr 1969 // R4_ARG2 = errValue 1970 // 1971 // result: 1972 // R3_RET = *adr or errValue 1973 1974 StubCodeMark mark(this, "StubRoutines", name); 1975 1976 // Entry point, pc or function descriptor. 1977 *entry = __ emit_fd(); 1978 1979 // Load *adr into R4_ARG2, may fault. 1980 *fault_pc = __ pc(); 1981 switch (size) { 1982 case 4: 1983 // int32_t, signed extended 1984 __ lwa(R4_ARG2, 0, R3_ARG1); 1985 break; 1986 case 8: 1987 // int64_t 1988 __ ld(R4_ARG2, 0, R3_ARG1); 1989 break; 1990 default: 1991 ShouldNotReachHere(); 1992 } 1993 1994 // return errValue or *adr 1995 *continuation_pc = __ pc(); 1996 __ mr(R3_RET, R4_ARG2); 1997 __ blr(); 1998 } 1999 2000 // Initialization 2001 void generate_initial() { 2002 // Generates all stubs and initializes the entry points 2003 2004 // Entry points that exist in all platforms. 2005 // Note: This is code that could be shared among different platforms - however the 2006 // benefit seems to be smaller than the disadvantage of having a 2007 // much more complicated generator structure. See also comment in 2008 // stubRoutines.hpp. 2009 2010 StubRoutines::_forward_exception_entry = generate_forward_exception(); 2011 StubRoutines::_call_stub_entry = generate_call_stub(StubRoutines::_call_stub_return_address); 2012 StubRoutines::_catch_exception_entry = generate_catch_exception(); 2013 } 2014 2015 void generate_all() { 2016 // Generates all stubs and initializes the entry points 2017 2018 // These entry points require SharedInfo::stack0 to be set up in 2019 // non-core builds 2020 StubRoutines::_throw_AbstractMethodError_entry = generate_throw_exception("AbstractMethodError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError), false); 2021 // Handle IncompatibleClassChangeError in itable stubs. 2022 StubRoutines::_throw_IncompatibleClassChangeError_entry= generate_throw_exception("IncompatibleClassChangeError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError), false); 2023 StubRoutines::_throw_NullPointerException_at_call_entry= generate_throw_exception("NullPointerException at call throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call), false); 2024 StubRoutines::_throw_StackOverflowError_entry = generate_throw_exception("StackOverflowError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_StackOverflowError), false); 2025 2026 StubRoutines::_handler_for_unsafe_access_entry = generate_handler_for_unsafe_access(); 2027 2028 // support for verify_oop (must happen after universe_init) 2029 StubRoutines::_verify_oop_subroutine_entry = generate_verify_oop(); 2030 2031 // arraycopy stubs used by compilers 2032 generate_arraycopy_stubs(); 2033 2034 // PPC uses stubs for safefetch. 2035 generate_safefetch("SafeFetch32", sizeof(int), &StubRoutines::_safefetch32_entry, 2036 &StubRoutines::_safefetch32_fault_pc, 2037 &StubRoutines::_safefetch32_continuation_pc); 2038 generate_safefetch("SafeFetchN", sizeof(intptr_t), &StubRoutines::_safefetchN_entry, 2039 &StubRoutines::_safefetchN_fault_pc, 2040 &StubRoutines::_safefetchN_continuation_pc); 2041 } 2042 2043 public: 2044 StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) { 2045 // replace the standard masm with a special one: 2046 _masm = new MacroAssembler(code); 2047 if (all) { 2048 generate_all(); 2049 } else { 2050 generate_initial(); 2051 } 2052 } 2053 }; 2054 2055 void StubGenerator_generate(CodeBuffer* code, bool all) { 2056 StubGenerator g(code, all); 2057 }