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, (u_int32_t)addr, cond, false);
163 }
164
165 inline void mov(Register dst, long l, Condition cond = C_DFLT) {
166 mov(dst, (u_int32_t)l, cond);
167 }
168 inline void mov(Register dst, unsigned long l, Condition cond = C_DFLT) {
169 mov(dst, (u_int32_t)l, cond);
170 }
171 inline void mov(Register dst, int i, Condition cond = C_DFLT) {
172 mov(dst, (u_int32_t)i, cond);
173 }
174 inline void mov(Register dst, u_int32_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 mov(rscratch2, -offset);
594 // bang with random number from r0
595 str(r0, Address(sp, rscratch2));
596 }
597
598 // Writes to stack successive pages until offset reached to check for
599 // stack overflow + shadow pages. Also, clobbers tmp
600 void bang_stack_size(Register size, Register tmp);
601
602 virtual RegisterOrConstant delayed_value_impl(intptr_t* delayed_value_addr,
603 Register tmp,
604 int offset);
605
606 // Support for serializing memory accesses between threads
607 void serialize_memory(Register thread, Register tmp);
608
609 // Arithmetics
610
611 void addptr(Address dst, int32_t src) {
612 lea(rscratch2, dst);
613 ldr(rscratch1, Address(rscratch2));
614 add(rscratch1, rscratch1, src);
615 str(rscratch1, Address(rscratch2));
616 }
617
618 void cmpptr(Register src1, Address src2);
619
620 void cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp,
621 Label &suceed, Label *fail);
622
623 void cmpxchgw(Register oldv, Register newv, Register addr, Register tmp,
624 Label &suceed, Label *fail);
625
626 void atomic_add(Register prev, RegisterOrConstant incr, Register addr);
627 void atomic_addw(Register prev, RegisterOrConstant incr, Register addr);
628
629 void atomic_xchg(Register prev, Register newv, Register addr);
630 void atomic_xchgw(Register prev, Register newv, Register addr);
631
632 void orptr(Address adr, RegisterOrConstant src) {
633 ldr(rscratch2, adr);
634 if (src.is_register())
635 orr(rscratch2, rscratch2, src.as_register());
636 else
637 orr(rscratch2, rscratch2, src.as_constant());
638 str(rscratch2, adr);
639 }
640
641 // Calls
642
643 void trampoline_call(Address entry, CodeBuffer *cbuf = NULL);
644
645 static bool far_branches() {
646 return ReservedCodeCacheSize > branch_range;
647 }
648
649 // Jumps that can reach anywhere in the code cache.
650 // Trashes tmp.
651 void far_call(Address entry, CodeBuffer *cbuf = NULL, Register tmp = rscratch1);
652 void far_jump(Address entry, CodeBuffer *cbuf = NULL, Register tmp = rscratch1);
653
654 static int far_branch_size() {
655 // TODO performance issue: always generate real far jumps
656 return 3 * 4; // movw, movt, br
657 }
658
659 // Emit the CompiledIC call idiom
660 void ic_call(address entry);
661
662 public:
663 // Data
664 void mov_metadata(Register dst, Metadata* obj);
665 Address allocate_metadata_address(Metadata* obj);
666 Address constant_oop_address(jobject obj);
667
668 void movoop(Register dst, jobject obj, bool immediate = false);
669
670 // CRC32 code for java.util.zip.CRC32::updateBytes() instrinsic.
671 void kernel_crc32(Register crc, Register buf, Register len,
672 Register table0, Register table1, Register table2, Register table3,
673 Register tmp, Register tmp2, Register tmp3);
674
675 #undef VIRTUAL
676
677 // Stack push and pop individual 64 bit registers
678 void push(Register src);
679 void pop(Register dst);
680
681 // push all registers onto the stack
682 void pusha();
683 void popa();
684
685 void repne_scan(Register addr, Register value, Register count,
686 Register scratch);
687 void repne_scanw(Register addr, Register value, Register count,
688 Register scratch);
689
690 // Form an address from base + offset in Rd. Rd may or may not actually be
691 // used: you must use the Address that is returned. It is up to you to ensure
692 // that the shift provided matches the size of your data.
693 Address form_address(Register Rd, Register base, long byte_offset, int shift);
694
695 public:
696
697 void ldr_constant(Register dest, const Address &const_addr) {
698 if (NearCpool) {
699 ldr(dest, const_addr);
700 } else {
701 mov(dest, InternalAddress(const_addr.target()));
702 ldr(dest, dest);
703 }
704 }
705
706 address read_polling_page(Register r, address page, relocInfo::relocType rtype);
707 address read_polling_page(Register r, relocInfo::relocType rtype);
708
709 // CRC32 code for java.util.zip.CRC32::updateBytes() instrinsic.
710 void update_byte_crc32(Register crc, Register val, Register table);
711 void update_word_crc32(Register crc, Register v, Register tmp, Register tmp2,
712 Register table0, Register table1, Register table2, Register table3);
713
714 // Auto dispatch for barriers isb, dmb & dsb.
715 void isb() {
716 if(VM_Version::features() & FT_ARMV7) {
717 Assembler::isb();
718 } else {
719 cp15isb();
720 }
721 }
722
723 void dsb(enum barrier option) {
724 if(VM_Version::features() & FT_ARMV7) {
725 Assembler::dsb(option);
726 } else {
727 cp15dsb();
728 }
729 }
730
731 void dmb(enum barrier option) {
732 if(VM_Version::features() & FT_ARMV7) {
733 Assembler::dmb(option);
734 } else {
735 cp15dmb();
736 }
737 }
738
739 void membar(Membar_mask_bits order_constraint) {
740 dmb(Assembler::barrier(order_constraint));
741 }
742
743 // ISB may be needed because of a safepoint
744 void maybe_isb() { MacroAssembler::isb(); }
745
746 // Helper functions for 64-bit multipliction, division and remainder
747 // does <Rd+1:Rd> = <Rn+1:Rn> * <Rm+1:Rm>
748 void mult_long(Register Rd, Register Rn, Register Rm);
749 // does <Rdh:Rd> = <Rnh:Rn> * <Rmh:Rm>
750 void mult_long(Register Rd, Register Rdh, Register Rn, Register Rnh, Register Rm, Register Rmh);
751
752 private:
753 void divide32(Register res, Register num, Register den, bool want_mod);
754 public:
755 // <Rd+1:Rd> = <Rn+1:Rn> / <Rm+1:Rm>
756 // <Rd+1:Rd> = <Rn+1:Rn> % <Rm+1:Rm>
757 // <Rd> = <Rn> / <Rm>
758 // <Rd> = <Rn> % <Rm>
759 void divide(Register Rd, Register Rn, Register Rm, int width, bool want_remainder);
760
761 void extract_bits(Register dest, Register source, int lsb, int width);
762
763 // These functions require that the src/dst register is an even register
764 // and will emit LDREXD/STREXD if there are multiple cores and the procesor
765 // supports it. If there's only one core then LDRD/STRD will be emit instead.
766 // If the processor has multiple cores and doesn't support LDREXD/STREXD then
767 // LDRD/STRD will be emitted and a warning message printed.
768 void atomic_ldrd(Register Rt, Register RtII, Register Rbase);
769 void atomic_strd(Register Rt, Register RtII, Register Rbase,
770 Register temp, Register tempII);
771
772 private:
773 // generic fallback ldrd generator. may need to use temporary register
774 // when register collisions are found
775 //
776 // since double_ld_failed_dispatch can introduce address manipulation instructions
777 // it should return offset of first load/store instruction that will be used
778 // while constructing implicit null check table
779 int double_ld_failed_dispatch(Register Rt, Register Rt2, const Address& adr,
780 void (Assembler::* mul)(unsigned, const Address&, Condition),
781 void (Assembler::* sgl)(Register, const Address&, Condition),
782 Register Rtmp, Condition cond);
783 // ldrd/strd generator. can handle all strd cases and those ldrd where there
784 // are no register collisions
785 void double_ldst_failed_dispatch(Register Rt, Register Rt2, const Address& adr,
786 void (Assembler::* mul)(unsigned, const Address&, Condition),
787 void (Assembler::* sgl)(Register, const Address&, Condition),
788 Condition cond);
789 public:
790 // override ldrd/strd to perform a magic for when Rt + 1 != Rt2 or any other
791 // conditions which prevent to use single ldrd/strd insn. a pair of ldr/str
792 // is used instead then
793 //
794 // Since ldrd/strd macro can introduce address manipulation instructions
795 // it should return offset of first load/store instruction that will be used
796 // while constructing implicit null check table
797 using Assembler::ldrd;
798 int ldrd(Register Rt, Register Rt2, const Address& adr, Register Rmp = rscratch1, Condition cond = C_DFLT);
799 using Assembler::strd;
800 int strd(Register Rt, Register Rt2, const Address& adr, Condition cond = C_DFLT);
801
802 private:
803 void bfc_impl(Register rd, int lsb, int width, Condition cond);
804 public:
805 void bfc(Register Rd, int lsb, int width, Condition cond = C_DFLT) {
806 if (VM_Version::features() & (FT_ARMV6T2 | FT_ARMV7))
807 Assembler::bfc(Rd, lsb, width, cond);
808 else
809 bfc_impl(Rd, lsb, width, cond);
810 }
811
812 void align_stack() {
813 if (StackAlignmentInBytes > 4)
814 bic(sp, sp, StackAlignmentInBytes-1);
815 }
816
817 #ifdef ASSERT
818 void verify_stack_alignment();
819 #endif
820
821 // Debug helper
822 void save_machine_state();
823 void restore_machine_state();
824
825 static uint32_t bytecodes_until_print;
826 static uint32_t bytecodes_executed;
827 static int enable_debug;
828 static int enable_method_debug;
829 static int enable_debugging_static;
830
831
832 void bytecode_seen(Register bc_reg, Register scratch);
833 static void print_unseen_bytecodes();
834 void reg_printf_internal(bool important, const char *fmt, Register a = r0, Register b = r0, Register c = r0);
835 void reg_printf_important(const char *fmt, Register a = r0, Register b = r0, Register c = r0);
836 void reg_printf(const char *fmt, Register a = r0, Register b = r0, Register c = r0);
837 void print_method_entry(Register rmethod, bool native);
838 void print_method_exit(bool normal = true);
839 void get_bytecode(Register bc, Register dst);
840 static void print_cpool(InstanceKlass *klass);
841
842 void create_breakpoint();
843 };
844
845
846 #ifdef ASSERT
847 inline bool AbstractAssembler::pd_check_instruction_mark() { return false; }
848 #endif
849
850 /**
851 * class SkipIfEqual:
852 *
853 * Instantiating this class will result in assembly code being output that will
854 * jump around any code emitted between the creation of the instance and it's
855 * automatic destruction at the end of a scope block, depending on the value of
856 * the flag passed to the constructor, which will be checked at run-time.
857 */
858 class SkipIfEqual {
859 private:
860 MacroAssembler* _masm;
861 Label _label;
862
863 public:
864 SkipIfEqual(MacroAssembler*, const bool* flag_addr, bool value);
865 ~SkipIfEqual();
866 };
867
868 struct tableswitch {
869 Register _reg;
870 int _insn_index;
871 jint _first_key;
872 jint _last_key;
873 Label _after;
874 Label _branches;
875 };
876
877 #endif // CPU_AARCH32_VM_MACROASSEMBLER_AARCH32_HPP