1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 2015, Red Hat Inc. All rights reserved. 4 * Copyright (c) 2015, Linaro Ltd. All rights reserved. 5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 6 * 7 * This code is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 only, as 9 * published by the Free Software Foundation. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 * 25 */ 26 27 #ifndef CPU_AARCH32_VM_MACROASSEMBLER_AARCH32_HPP 28 #define CPU_AARCH32_VM_MACROASSEMBLER_AARCH32_HPP 29 30 #include "asm/assembler.hpp" 31 32 // MacroAssembler extends Assembler by frequently used macros. 33 // 34 // Instructions for which a 'better' code sequence exists depending 35 // on arguments should also go in here. 36 37 class MacroAssembler: public Assembler { 38 friend class LIR_Assembler; 39 40 using Assembler::mov; 41 42 protected: 43 44 // Support for VM calls 45 // 46 // This is the base routine called by the different versions of call_VM_leaf. The interpreter 47 // may customize this version by overriding it for its purposes (e.g., to save/restore 48 // additional registers when doing a VM call). 49 #ifdef CC_INTERP 50 // c++ interpreter never wants to use interp_masm version of call_VM 51 #define VIRTUAL 52 #else 53 #define VIRTUAL virtual 54 #endif 55 56 VIRTUAL void call_VM_leaf_base( 57 address entry_point, // the entry point 58 int number_of_arguments, // the number of arguments to pop after the call 59 Label *retaddr = NULL 60 ); 61 62 VIRTUAL void call_VM_leaf_base( 63 address entry_point, // the entry point 64 int number_of_arguments, // the number of arguments to pop after the call 65 Label &retaddr) { 66 call_VM_leaf_base(entry_point, number_of_arguments, &retaddr); 67 } 68 69 // This is the base routine called by the different versions of call_VM. The interpreter 70 // may customize this version by overriding it for its purposes (e.g., to save/restore 71 // additional registers when doing a VM call). 72 // 73 // If no java_thread register is specified (noreg) than rthread will be used instead. call_VM_base 74 // returns the register which contains the thread upon return. If a thread register has been 75 // specified, the return value will correspond to that register. If no last_java_sp is specified 76 // (noreg) than rsp will be used instead. 77 VIRTUAL void call_VM_base( // returns the register containing the thread upon return 78 Register oop_result, // where an oop-result ends up if any; use noreg otherwise 79 Register java_thread, // the thread if computed before ; use noreg otherwise 80 Register last_java_sp, // to set up last_Java_frame in stubs; use noreg otherwise 81 address entry_point, // the entry point 82 int number_of_arguments, // the number of arguments (w/o thread) to pop after the call 83 bool check_exceptions // whether to check for pending exceptions after return 84 ); 85 86 // These routines should emit JVMTI PopFrame and ForceEarlyReturn handling code. 87 // The implementation is only non-empty for the InterpreterMacroAssembler, 88 // as only the interpreter handles PopFrame and ForceEarlyReturn requests. 89 virtual void check_and_handle_popframe(Register java_thread); 90 virtual void check_and_handle_earlyret(Register java_thread); 91 92 void call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions = true); 93 94 public: 95 void init_unseen_bytecodes(); 96 MacroAssembler(CodeBuffer* code) : Assembler(code) { init_unseen_bytecodes();} 97 98 // Biased locking support 99 // lock_reg and obj_reg must be loaded up with the appropriate values. 100 // swap_reg is killed. 101 // tmp_reg is optional. If it is supplied (i.e., != noreg) it will 102 // be killed; if not supplied, push/pop will be used internally to 103 // allocate a temporary (inefficient, avoid if possible). 104 // Optional slow case is for implementations (interpreter and C1) which branch to 105 // slow case directly. Leaves condition codes set for C2's Fast_Lock node. 106 // Returns offset of first potentially-faulting instruction for null 107 // check info (currently consumed only by C1). If 108 // swap_reg_contains_mark is true then returns -1 as it is assumed 109 // the calling code has already passed any potential faults. 110 int biased_locking_enter(Register lock_reg, Register obj_reg, 111 Register swap_reg, Register tmp_reg, 112 bool swap_reg_contains_mark, 113 Label& done, Label* slow_case = NULL, 114 BiasedLockingCounters* counters = NULL); 115 void biased_locking_exit (Register obj_reg, Register temp_reg, Label& done); 116 117 118 // Helper functions for statistics gathering. 119 // Unconditional atomic increment. 120 void atomic_inc(Register counter_addr, Register tmp); 121 void atomic_inc(Address counter_addr, Register tmp1, Register tmp2) { 122 lea(tmp1, counter_addr); 123 atomic_inc(tmp1, tmp2); 124 } 125 // Load Effective Address 126 void lea(Register r, const Address &a) { 127 InstructionMark im(this); 128 code_section()->relocate(inst_mark(), a.rspec()); 129 a.lea(this, r); 130 } 131 132 virtual void _call_Unimplemented(address call_site) { 133 mov(rscratch2, call_site); 134 stop("HALT"); 135 } 136 137 #define call_Unimplemented() _call_Unimplemented((address)__PRETTY_FUNCTION__) 138 139 // macro assembly operations needed for aarch32 140 141 // first two private routines for loading 32 bit constants 142 //TODO Probably add back the 64-bit one as it will be useful for longs 143 private: 144 145 int push(unsigned int bitset, Register stack); 146 int pop(unsigned int bitset, Register stack); 147 148 public: 149 150 void mov(Register dst, Address a, Condition cond = C_DFLT); 151 152 153 void push(RegSet regs, Register stack) { if (regs.bits()) push(regs.bits(), stack); } 154 void pop(RegSet regs, Register stack) { if (regs.bits()) pop(regs.bits(), stack); } 155 156 // now mov instructions for loading absolute addresses and 32bit immediates 157 158 inline void mov(Register dst, address addr, Condition cond = C_DFLT) { 159 // TODO: Do Address end up as address and then passing through this method, after 160 // being marked for relocation elsewhere? If not (as I suspect) then this can 161 // be relaxed to mov_immediate to potentially produce shorter code sequences. 162 mov_immediate32(dst, (uint32_t)addr, cond, false); 163 } 164 165 inline void mov(Register dst, long l, Condition cond = C_DFLT) { 166 mov(dst, (uint32_t)l, cond); 167 } 168 inline void mov(Register dst, unsigned long l, Condition cond = C_DFLT) { 169 mov(dst, (uint32_t)l, cond); 170 } 171 inline void mov(Register dst, int i, Condition cond = C_DFLT) { 172 mov(dst, (uint32_t)i, cond); 173 } 174 inline void mov(Register dst, uint32_t i, Condition cond = C_DFLT) { 175 mov_immediate(dst, i, cond, false); 176 } 177 178 inline void mov(Register dst, Register src, Condition cond = C_DFLT) { 179 Assembler::mov(dst, src, cond); 180 } 181 inline void mov(Register dst, Register src, shift_op shift, 182 Condition cond = C_DFLT) { 183 Assembler::mov(dst, src, shift, cond); 184 } 185 // TODO add sflag compatibility 186 void movptr(Register r, uintptr_t imm32, Condition cond = C_DFLT); 187 188 void ret(Register reg); 189 190 // Both of these are aarch64 instructions that can easily be emulated 191 // Note that this does not quite have the same semantics as aarch64 192 // version as this updates the s flag. 193 void cbz(Register r, Label& l) { 194 cmp(r, 0); 195 b(l, EQ); 196 } 197 void cbnz(Register r, Label& l) { 198 cmp(r, 0); 199 b(l, NE); 200 } 201 void tbz(Register r, unsigned bit, Label& l) { 202 tst(r, 1 << bit); 203 b(l, EQ); 204 } 205 void tbnz(Register r, unsigned bit, Label& l) { 206 tst(r, 1 << bit); 207 b(l, NE); 208 } 209 210 void addmw(Address a, Register incr, Register scratch) { 211 ldr(scratch, a); 212 add(scratch, scratch, incr); 213 str(scratch, a); 214 } 215 216 // Add constant to memory word 217 void addmw(Address a, int imm, Register scratch) { 218 ldr(scratch, a); 219 if (imm > 0) 220 add(scratch, scratch, (unsigned)imm); 221 else 222 sub(scratch, scratch, (unsigned)-imm); 223 str(scratch, a); 224 } 225 226 // XXX stubs 227 228 Register tlab_refill(Label& retry, Label& try_eden, Label& slow_case); 229 230 // macro instructions for accessing and updating floating point 231 // status register 232 // 233 // FPSR : op1 == 011 234 // CRn == 0100 235 // CRm == 0100 236 // op2 == 001 237 238 inline void get_fpsr(Register reg = as_Register(0xf)) { 239 vmrs(reg); 240 } 241 242 inline void set_fpsr(Register reg) { 243 vmsr(reg); 244 } 245 246 inline void clear_fpsr() { 247 mov(rscratch1, 0); 248 set_fpsr(rscratch1); 249 } 250 251 // Support for NULL-checks 252 // 253 // Generates code that causes a NULL OS exception if the content of reg is NULL. 254 // If the accessed location is M[reg + offset] and the offset is known, provide the 255 // offset. No explicit code generation is needed if the offset is within a certain 256 // range (0 <= offset <= page_size). 257 258 virtual void null_check(Register reg, int offset = -1); 259 static bool needs_explicit_null_check(intptr_t offset); 260 261 static address target_addr_for_insn(address insn_addr, unsigned insn); 262 static address target_addr_for_insn(address insn_addr) { 263 unsigned insn = *(unsigned*)insn_addr; 264 return target_addr_for_insn(insn_addr, insn); 265 } 266 267 // Required platform-specific helpers for Label::patch_instructions. 268 // They _shadow_ the declarations in AbstractAssembler, which are undefined. 269 static int pd_patch_instruction_size(address branch, address target); 270 static void pd_patch_instruction(address branch, address target) { 271 pd_patch_instruction_size(branch, target); 272 } 273 274 #ifndef PRODUCT 275 static void pd_print_patched_instruction(address branch); 276 #endif 277 278 static int patch_oop(address insn_addr, address o); 279 280 // The following 4 methods return the offset of the appropriate move instruction 281 282 // Support for fast byte/short loading with zero extension (depending on particular CPU) 283 int load_unsigned_byte(Register dst, Address src); 284 int load_unsigned_short(Register dst, Address src); 285 286 // Support for fast byte/short loading with sign extension (depending on particular CPU) 287 int load_signed_byte(Register dst, Address src); 288 int load_signed_short(Register dst, Address src); 289 290 // Support for sign-extension (hi:lo = extend_sign(lo)) 291 void extend_sign(Register hi, Register lo); 292 293 // Load and store values by size and signed-ness 294 void load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed, Register dst2 = noreg); 295 void store_sized_value(Address dst, Register src, size_t size_in_bytes, Register src2 = noreg); 296 297 // Support for inc/dec with optimal instruction selection depending on value. 298 // increment()/decrement() calls with an address destination will need to use 299 // rscratch1 to load the value to be incremented. increment()/decrement() 300 // calls which add or subtract a constant value greater than 2^12 will need 301 // to use rscratch2 to hold the constant. So, a register increment()/ 302 // decrement() may trash rscratch2, and an address increment()/decrement() 303 // may trash rscratch1 and rscratch2. 304 void decrement(Register reg, int value = 1); 305 void decrement(Address dst, int value = 1); 306 void increment(Register reg, int value = 1); 307 void increment(Address dst, int value = 1); 308 309 // Alignment 310 void align(int modulus); 311 312 // Stack frame creation/removal 313 void enter() 314 { 315 stmdb(sp, RegSet::of(rfp, lr).bits()); 316 add(rfp, sp, wordSize); 317 } 318 319 void leave() 320 { 321 sub(sp, rfp, wordSize); 322 ldmia(sp, RegSet::of(rfp, lr).bits()); 323 } 324 325 // Support for getting the JavaThread pointer (i.e.; a reference to thread-local information) 326 // The pointer will be loaded into the thread register. 327 void get_thread(Register thread); 328 329 enum ret_type { ret_type_void, ret_type_integral, ret_type_float, ret_type_double}; 330 // Support for VM calls 331 // 332 // It is imperative that all calls into the VM are handled via the call_VM macros. 333 // They make sure that the stack linkage is setup correctly. call_VM's correspond 334 // to ENTRY/ENTRY_X entry points while call_VM_leaf's correspond to LEAF entry points. 335 336 337 void call_VM(Register oop_result, 338 address entry_point, 339 bool check_exceptions = true); 340 void call_VM(Register oop_result, 341 address entry_point, 342 Register arg_1, 343 bool check_exceptions = true); 344 void call_VM(Register oop_result, 345 address entry_point, 346 Register arg_1, Register arg_2, 347 bool check_exceptions = true); 348 void call_VM(Register oop_result, 349 address entry_point, 350 Register arg_1, Register arg_2, Register arg_3, 351 bool check_exceptions = true); 352 353 // Overloadings with last_Java_sp 354 void call_VM(Register oop_result, 355 Register last_java_sp, 356 address entry_point, 357 int number_of_arguments = 0, 358 bool check_exceptions = true); 359 void call_VM(Register oop_result, 360 Register last_java_sp, 361 address entry_point, 362 Register arg_1, bool 363 check_exceptions = true); 364 void call_VM(Register oop_result, 365 Register last_java_sp, 366 address entry_point, 367 Register arg_1, Register arg_2, 368 bool check_exceptions = true); 369 void call_VM(Register oop_result, 370 Register last_java_sp, 371 address entry_point, 372 Register arg_1, Register arg_2, Register arg_3, 373 bool check_exceptions = true); 374 375 void get_vm_result (Register oop_result, Register thread); 376 void get_vm_result_2(Register metadata_result, Register thread); 377 378 // These always tightly bind to MacroAssembler::call_VM_base 379 // bypassing the virtual implementation 380 void super_call_VM(Register oop_result, Register last_java_sp, address entry_point, int number_of_arguments = 0, bool check_exceptions = true); 381 void super_call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions = true); 382 void super_call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, bool check_exceptions = true); 383 void super_call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions = true); 384 void super_call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, Register arg_3, Register arg_4, bool check_exceptions = true); 385 386 void call_VM_leaf(address entry_point, 387 int number_of_arguments = 0); 388 void call_VM_leaf(address entry_point, 389 Register arg_1); 390 void call_VM_leaf(address entry_point, 391 Register arg_1, Register arg_2); 392 void call_VM_leaf(address entry_point, 393 Register arg_1, Register arg_2, Register arg_3); 394 395 // These always tightly bind to MacroAssembler::call_VM_leaf_base 396 // bypassing the virtual implementation 397 void super_call_VM_leaf(address entry_point); 398 void super_call_VM_leaf(address entry_point, Register arg_1); 399 void super_call_VM_leaf(address entry_point, Register arg_1, Register arg_2); 400 void super_call_VM_leaf(address entry_point, Register arg_1, Register arg_2, Register arg_3); 401 void super_call_VM_leaf(address entry_point, Register arg_1, Register arg_2, Register arg_3, Register arg_4); 402 403 // last Java Frame (fills frame anchor) 404 void set_last_Java_frame(Register last_java_sp, 405 Register last_java_fp, 406 address last_java_pc, 407 Register scratch); 408 409 void set_last_Java_frame(Register last_java_sp, 410 Register last_java_fp, 411 Label &last_java_pc, 412 Register scratch); 413 414 void set_last_Java_frame(Register last_java_sp, 415 Register last_java_fp, 416 Register last_java_pc, 417 Register scratch); 418 419 void reset_last_Java_frame(Register thread, bool clearfp, bool clear_pc); 420 421 // thread in the default location (r15_thread on 64bit) 422 void reset_last_Java_frame(bool clear_fp, bool clear_pc); 423 424 // Stores 425 void store_check(Register obj); // store check for obj - register is destroyed afterwards 426 void store_check(Register obj, Address dst); // same as above, dst is exact store location (reg. is destroyed) 427 428 #if INCLUDE_ALL_GCS 429 430 void g1_write_barrier_pre(Register obj, 431 Register pre_val, 432 Register thread, 433 Register tmp, 434 bool tosca_live, 435 bool expand_call); 436 437 void g1_write_barrier_post(Register store_addr, 438 Register new_val, 439 Register thread, 440 Register tmp, 441 Register tmp2); 442 443 #endif // INCLUDE_ALL_GCS 444 445 // split store_check(Register obj) to enhance instruction interleaving 446 void store_check_part_1(Register obj); 447 void store_check_part_2(Register obj); 448 449 // oop manipulations 450 void load_klass(Register dst, Register src); 451 void store_klass(Register dst, Register src); 452 void cmp_klass(Register oop, Register trial_klass, Register tmp); 453 454 void load_heap_oop(Register dst, Address src); 455 456 void load_heap_oop_not_null(Register dst, Address src); 457 void store_heap_oop(Address dst, Register src); 458 459 // Used for storing NULL. All other oop constants should be 460 // stored using routines that take a jobject. 461 void store_heap_oop_null(Address dst); 462 463 void load_prototype_header(Register dst, Register src); 464 465 void store_klass_gap(Register dst, Register src); 466 467 // This dummy is to prevent a call to store_heap_oop from 468 // converting a zero (like NULL) into a Register by giving 469 // the compiler two choices it can't resolve 470 471 void store_heap_oop(Address dst, void* dummy); 472 473 void push_CPU_state(); 474 void pop_CPU_state() ; 475 476 // Round up to a power of two 477 void round_to(Register reg, int modulus); 478 479 // allocation 480 void eden_allocate( 481 Register obj, // result: pointer to object after successful allocation 482 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise 483 int con_size_in_bytes, // object size in bytes if known at compile time 484 Register t1, // temp register 485 Label& slow_case // continuation point if fast allocation fails 486 ); 487 void tlab_allocate( 488 Register obj, // result: pointer to object after successful allocation 489 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise 490 int con_size_in_bytes, // object size in bytes if known at compile time 491 Register t1, // temp register 492 Register t2, // temp register 493 Label& slow_case // continuation point if fast allocation fails 494 ); 495 496 void verify_tlab(); 497 498 void incr_allocated_bytes(Register thread, 499 Register var_size_in_bytes, int con_size_in_bytes, 500 Register t1 = noreg); 501 502 // interface method calling 503 void lookup_interface_method(Register recv_klass, 504 Register intf_klass, 505 RegisterOrConstant itable_index, 506 Register method_result, 507 Register scan_temp, 508 Label& no_such_interface); 509 510 // virtual method calling 511 // n.b. x86 allows RegisterOrConstant for vtable_index 512 void lookup_virtual_method(Register recv_klass, 513 RegisterOrConstant vtable_index, 514 Register method_result); 515 516 // Test sub_klass against super_klass, with fast and slow paths. 517 518 // The fast path produces a tri-state answer: yes / no / maybe-slow. 519 // One of the three labels can be NULL, meaning take the fall-through. 520 // If super_check_offset is -1, the value is loaded up from super_klass. 521 // No registers are killed, except temp_reg. 522 void check_klass_subtype_fast_path(Register sub_klass, 523 Register super_klass, 524 Register temp_reg, 525 Label* L_success, 526 Label* L_failure, 527 Label* L_slow_path, 528 RegisterOrConstant super_check_offset = RegisterOrConstant(-1)); 529 530 // The rest of the type check; must be wired to a corresponding fast path. 531 // It does not repeat the fast path logic, so don't use it standalone. 532 // The temp_reg and temp2_reg can be noreg, if no temps are available. 533 // Updates the sub's secondary super cache as necessary. 534 // If set_cond_codes, condition codes will be Z on success, NZ on failure. 535 void check_klass_subtype_slow_path(Register sub_klass, 536 Register super_klass, 537 Register temp_reg, 538 Register temp2_reg, 539 Label* L_success, 540 Label* L_failure, 541 bool set_cond_codes = false); 542 543 // Simplified, combined version, good for typical uses. 544 // Falls through on failure. 545 void check_klass_subtype(Register sub_klass, 546 Register super_klass, 547 Register temp_reg, 548 Label& L_success); 549 550 Address argument_address(RegisterOrConstant arg_slot, int extra_slot_offset = 0); 551 552 553 // Debugging 554 555 // only if +VerifyOops 556 void verify_oop(Register reg, const char* s = "broken oop"); 557 void verify_oop_addr(Address addr, const char * s = "broken oop addr"); 558 559 // TODO: verify method and klass metadata (compare against vptr?) 560 void _verify_method_ptr(Register reg, const char * msg, const char * file, int line) {} 561 void _verify_klass_ptr(Register reg, const char * msg, const char * file, int line){} 562 563 #define verify_method_ptr(reg) _verify_method_ptr(reg, "broken method " #reg, __FILE__, __LINE__) 564 #define verify_klass_ptr(reg) _verify_klass_ptr(reg, "broken klass " #reg, __FILE__, __LINE__) 565 566 // only if +VerifyFPU 567 void verify_FPU(int stack_depth, const char* s = "illegal FPU state"); 568 569 // prints msg, dumps registers and stops execution 570 void stop(const char* msg); 571 572 // prints msg and continues 573 void warn(const char* msg); 574 575 static void debug32(char* msg, int32_t pc, int32_t regs[]); 576 577 void untested() { stop("untested"); } 578 579 void unimplemented(const char* what = "") { char* b = new char[1024]; jio_snprintf(b, 1024, "unimplemented: %s", what); stop(b); } 580 581 #define should_not_reach_here() should_not_reach_here_line(__FILE__, __LINE__) 582 void should_not_reach_here_line(const char *file, int line) { 583 mov(rscratch1, line); 584 reg_printf_important(file); 585 reg_printf_important(": %d", rscratch1); 586 stop("should_not_reach_here"); 587 } 588 589 // Stack overflow checking 590 void bang_stack_with_offset(int offset) { 591 // stack grows down, caller passes positive offset 592 assert(offset > 0, "must bang with negative offset"); 593 // bang with random value from r0 594 if (operand_valid_for_add_sub_immediate(offset)) { 595 sub(rscratch2, sp, offset); 596 strb(r0, Address(rscratch2)); 597 } else { 598 mov(rscratch2, offset); 599 strb(r0, Address(sp, rscratch2, Assembler::lsl(), Address::SUB)); 600 } 601 } 602 603 // Writes to stack successive pages until offset reached to check for 604 // stack overflow + shadow pages. Also, clobbers tmp 605 void bang_stack_size(Register size, Register tmp); 606 607 virtual RegisterOrConstant delayed_value_impl(intptr_t* delayed_value_addr, 608 Register tmp, 609 int offset); 610 611 // Support for serializing memory accesses between threads 612 void serialize_memory(Register thread, Register tmp); 613 614 // Arithmetics 615 616 void addptr(Address dst, int32_t src) { 617 lea(rscratch2, dst); 618 ldr(rscratch1, Address(rscratch2)); 619 add(rscratch1, rscratch1, src); 620 str(rscratch1, Address(rscratch2)); 621 } 622 623 void cmpptr(Register src1, Address src2); 624 625 void cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp, 626 Label &suceed, Label *fail); 627 628 void cmpxchgw(Register oldv, Register newv, Register addr, Register tmp, 629 Label &suceed, Label *fail); 630 631 void atomic_add(Register prev, RegisterOrConstant incr, Register addr); 632 void atomic_addw(Register prev, RegisterOrConstant incr, Register addr); 633 634 void atomic_xchg(Register prev, Register newv, Register addr); 635 void atomic_xchgw(Register prev, Register newv, Register addr); 636 637 void orptr(Address adr, RegisterOrConstant src) { 638 ldr(rscratch2, adr); 639 if (src.is_register()) 640 orr(rscratch2, rscratch2, src.as_register()); 641 else 642 orr(rscratch2, rscratch2, src.as_constant()); 643 str(rscratch2, adr); 644 } 645 646 // Calls 647 648 void trampoline_call(Address entry, CodeBuffer *cbuf = NULL); 649 650 static bool far_branches() { 651 return ReservedCodeCacheSize > branch_range; 652 } 653 654 // Jumps that can reach anywhere in the code cache. 655 // Trashes tmp. 656 void far_call(Address entry, CodeBuffer *cbuf = NULL, Register tmp = rscratch1); 657 void far_jump(Address entry, CodeBuffer *cbuf = NULL, Register tmp = rscratch1); 658 659 static int far_branch_size() { 660 // TODO performance issue: always generate real far jumps 661 if (far_branches()) { 662 return 3 * 4; // movw, movt, br 663 } else { 664 return 4; 665 } 666 } 667 668 // Emit the CompiledIC call idiom 669 void ic_call(address entry); 670 671 public: 672 // Data 673 void mov_metadata(Register dst, Metadata* obj); 674 Address allocate_metadata_address(Metadata* obj); 675 Address constant_oop_address(jobject obj); 676 677 void movoop(Register dst, jobject obj, bool immediate = false); 678 679 // CRC32 code for java.util.zip.CRC32::updateBytes() instrinsic. 680 void kernel_crc32(Register crc, Register buf, Register len, 681 Register table0, Register table1, Register table2, Register table3, 682 Register tmp, Register tmp2, Register tmp3); 683 684 #undef VIRTUAL 685 686 // Stack push and pop individual 64 bit registers 687 void push(Register src); 688 void pop(Register dst); 689 690 // push all registers onto the stack 691 void pusha(); 692 void popa(); 693 694 void repne_scan(Register addr, Register value, Register count, 695 Register scratch); 696 void repne_scanw(Register addr, Register value, Register count, 697 Register scratch); 698 699 // Form an address from base + offset in Rd. Rd may or may not actually be 700 // used: you must use the Address that is returned. It is up to you to ensure 701 // that the shift provided matches the size of your data. 702 Address form_address(Register Rd, Register base, long byte_offset, int shift); 703 704 public: 705 706 void ldr_constant(Register dest, const Address &const_addr) { 707 if (NearCpool) { 708 ldr(dest, const_addr); 709 } else { 710 mov(dest, InternalAddress(const_addr.target())); 711 ldr(dest, dest); 712 } 713 } 714 715 address read_polling_page(Register r, address page, relocInfo::relocType rtype); 716 address read_polling_page(Register r, relocInfo::relocType rtype); 717 718 // CRC32 code for java.util.zip.CRC32::updateBytes() instrinsic. 719 void update_byte_crc32(Register crc, Register val, Register table); 720 void update_word_crc32(Register crc, Register v, Register tmp, Register tmp2, 721 Register table0, Register table1, Register table2, Register table3); 722 723 // Auto dispatch for barriers isb, dmb & dsb. 724 void isb() { 725 if(VM_Version::features() & FT_ARMV7) { 726 Assembler::isb(); 727 } else { 728 cp15isb(); 729 } 730 } 731 732 void dsb(enum barrier option) { 733 if(VM_Version::features() & FT_ARMV7) { 734 Assembler::dsb(option); 735 } else { 736 cp15dsb(); 737 } 738 } 739 740 void dmb(enum barrier option) { 741 if(VM_Version::features() & FT_ARMV7) { 742 Assembler::dmb(option); 743 } else { 744 cp15dmb(); 745 } 746 } 747 748 void membar(Membar_mask_bits order_constraint) { 749 dmb(Assembler::barrier(order_constraint)); 750 } 751 752 // ISB may be needed because of a safepoint 753 void maybe_isb() { MacroAssembler::isb(); } 754 755 // Helper functions for 64-bit multipliction, division and remainder 756 // does <Rd+1:Rd> = <Rn+1:Rn> * <Rm+1:Rm> 757 void mult_long(Register Rd, Register Rn, Register Rm); 758 // does <Rdh:Rd> = <Rnh:Rn> * <Rmh:Rm> 759 void mult_long(Register Rd, Register Rdh, Register Rn, Register Rnh, Register Rm, Register Rmh); 760 761 private: 762 void divide32(Register res, Register num, Register den, bool want_mod); 763 public: 764 // <Rd+1:Rd> = <Rn+1:Rn> / <Rm+1:Rm> 765 // <Rd+1:Rd> = <Rn+1:Rn> % <Rm+1:Rm> 766 // <Rd> = <Rn> / <Rm> 767 // <Rd> = <Rn> % <Rm> 768 void divide(Register Rd, Register Rn, Register Rm, int width, bool want_remainder); 769 770 void extract_bits(Register dest, Register source, int lsb, int width); 771 772 // These functions require that the src/dst register is an even register 773 // and will emit LDREXD/STREXD if there are multiple cores and the procesor 774 // supports it. If there's only one core then LDRD/STRD will be emit instead. 775 // If the processor has multiple cores and doesn't support LDREXD/STREXD then 776 // LDRD/STRD will be emitted and a warning message printed. 777 void atomic_ldrd(Register Rt, Register RtII, Register Rbase); 778 void atomic_strd(Register Rt, Register RtII, Register Rbase, 779 Register temp, Register tempII); 780 781 private: 782 // generic fallback ldrd generator. may need to use temporary register 783 // when register collisions are found 784 // 785 // since double_ld_failed_dispatch can introduce address manipulation instructions 786 // it should return offset of first load/store instruction that will be used 787 // while constructing implicit null check table 788 int double_ld_failed_dispatch(Register Rt, Register Rt2, const Address& adr, 789 void (Assembler::* mul)(unsigned, const Address&, Condition), 790 void (Assembler::* sgl)(Register, const Address&, Condition), 791 Register Rtmp, Condition cond); 792 // ldrd/strd generator. can handle all strd cases and those ldrd where there 793 // are no register collisions 794 void double_ldst_failed_dispatch(Register Rt, Register Rt2, const Address& adr, 795 void (Assembler::* mul)(unsigned, const Address&, Condition), 796 void (Assembler::* sgl)(Register, const Address&, Condition), 797 Condition cond); 798 public: 799 // override ldrd/strd to perform a magic for when Rt + 1 != Rt2 or any other 800 // conditions which prevent to use single ldrd/strd insn. a pair of ldr/str 801 // is used instead then 802 // 803 // Since ldrd/strd macro can introduce address manipulation instructions 804 // it should return offset of first load/store instruction that will be used 805 // while constructing implicit null check table 806 using Assembler::ldrd; 807 int ldrd(Register Rt, Register Rt2, const Address& adr, Register Rmp = rscratch1, Condition cond = C_DFLT); 808 using Assembler::strd; 809 int strd(Register Rt, Register Rt2, const Address& adr, Condition cond = C_DFLT); 810 811 private: 812 void bfc_impl(Register rd, int lsb, int width, Condition cond); 813 public: 814 void bfc(Register Rd, int lsb, int width, Condition cond = C_DFLT) { 815 if (VM_Version::features() & (FT_ARMV6T2 | FT_ARMV7)) 816 Assembler::bfc(Rd, lsb, width, cond); 817 else 818 bfc_impl(Rd, lsb, width, cond); 819 } 820 821 void align_stack() { 822 if (StackAlignmentInBytes > 4) 823 bic(sp, sp, StackAlignmentInBytes-1); 824 } 825 826 #ifdef ASSERT 827 void verify_stack_alignment(); 828 #endif 829 830 // Debug helper 831 void save_machine_state(); 832 void restore_machine_state(); 833 834 static uint32_t bytecodes_until_print; 835 static uint32_t bytecodes_executed; 836 static int enable_debug; 837 static int enable_method_debug; 838 static int enable_debugging_static; 839 840 841 void bytecode_seen(Register bc_reg, Register scratch); 842 static void print_unseen_bytecodes(); 843 void reg_printf_internal(bool important, const char *fmt, Register a = r0, Register b = r0, Register c = r0); 844 void reg_printf_important(const char *fmt, Register a = r0, Register b = r0, Register c = r0); 845 void reg_printf(const char *fmt, Register a = r0, Register b = r0, Register c = r0); 846 void print_method_entry(Register rmethod, bool native); 847 void print_method_exit(bool normal = true); 848 void get_bytecode(Register bc, Register dst); 849 static void print_cpool(InstanceKlass *klass); 850 851 void create_breakpoint(); 852 }; 853 854 855 #ifdef ASSERT 856 inline bool AbstractAssembler::pd_check_instruction_mark() { return false; } 857 #endif 858 859 /** 860 * class SkipIfEqual: 861 * 862 * Instantiating this class will result in assembly code being output that will 863 * jump around any code emitted between the creation of the instance and it's 864 * automatic destruction at the end of a scope block, depending on the value of 865 * the flag passed to the constructor, which will be checked at run-time. 866 */ 867 class SkipIfEqual { 868 private: 869 MacroAssembler* _masm; 870 Label _label; 871 872 public: 873 SkipIfEqual(MacroAssembler*, const bool* flag_addr, bool value); 874 ~SkipIfEqual(); 875 }; 876 877 struct tableswitch { 878 Register _reg; 879 int _insn_index; 880 jint _first_key; 881 jint _last_key; 882 Label _after; 883 Label _branches; 884 }; 885 886 #endif // CPU_AARCH32_VM_MACROASSEMBLER_AARCH32_HPP