1 /*
2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2018, SAP SE. 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 #ifndef CPU_S390_VM_MACROASSEMBLER_S390_HPP
27 #define CPU_S390_VM_MACROASSEMBLER_S390_HPP
28
29 #include "asm/assembler.hpp"
30 #include "oops/accessDecorators.hpp"
31
32 #define MODERN_IFUN(name) ((void (MacroAssembler::*)(Register, int64_t, Register, Register))&MacroAssembler::name)
33 #define CLASSIC_IFUN(name) ((void (MacroAssembler::*)(Register, int64_t, Register, Register))&MacroAssembler::name)
34 #define MODERN_FFUN(name) ((void (MacroAssembler::*)(FloatRegister, int64_t, Register, Register))&MacroAssembler::name)
35 #define CLASSIC_FFUN(name) ((void (MacroAssembler::*)(FloatRegister, int64_t, Register, Register))&MacroAssembler::name)
36
37 class MacroAssembler: public Assembler {
38 public:
39 MacroAssembler(CodeBuffer* code) : Assembler(code) {}
40
41 //
42 // Optimized instruction emitters
43 //
44
45 // Move register if destination register and target register are different.
46 void lr_if_needed(Register rd, Register rs);
47 void lgr_if_needed(Register rd, Register rs);
48 void llgfr_if_needed(Register rd, Register rs);
49 void ldr_if_needed(FloatRegister rd, FloatRegister rs);
50
51 void move_reg_if_needed(Register dest, BasicType dest_type, Register src, BasicType src_type);
52 void move_freg_if_needed(FloatRegister dest, BasicType dest_type, FloatRegister src, BasicType src_type);
53
54 void freg2mem_opt(FloatRegister reg,
55 int64_t disp,
56 Register index,
57 Register base,
58 void (MacroAssembler::*modern) (FloatRegister, int64_t, Register, Register),
59 void (MacroAssembler::*classic)(FloatRegister, int64_t, Register, Register),
60 Register scratch = Z_R0);
61 void freg2mem_opt(FloatRegister reg,
62 const Address &a, bool is_double = true);
63
64 void mem2freg_opt(FloatRegister reg,
65 int64_t disp,
66 Register index,
67 Register base,
68 void (MacroAssembler::*modern) (FloatRegister, int64_t, Register, Register),
69 void (MacroAssembler::*classic)(FloatRegister, int64_t, Register, Register),
70 Register scratch = Z_R0);
71 void mem2freg_opt(FloatRegister reg,
72 const Address &a, bool is_double = true);
73
74 void reg2mem_opt(Register reg,
75 int64_t disp,
76 Register index,
77 Register base,
78 void (MacroAssembler::*modern) (Register, int64_t, Register, Register),
79 void (MacroAssembler::*classic)(Register, int64_t, Register, Register),
80 Register scratch = Z_R0);
81 // returns offset of the store instruction
82 int reg2mem_opt(Register reg, const Address &a, bool is_double = true);
83
84 void mem2reg_opt(Register reg,
85 int64_t disp,
86 Register index,
87 Register base,
88 void (MacroAssembler::*modern) (Register, int64_t, Register, Register),
89 void (MacroAssembler::*classic)(Register, int64_t, Register, Register));
90 void mem2reg_opt(Register reg, const Address &a, bool is_double = true);
91 void mem2reg_signed_opt(Register reg, const Address &a);
92
93 // AND immediate and set condition code, works for 64 bit immediates/operation as well.
94 void and_imm(Register r, long mask, Register tmp = Z_R0, bool wide = false);
95
96 // 1's complement, 32bit or 64bit. Optimized to exploit distinct operands facility.
97 // Note: The condition code is neither preserved nor correctly set by this code!!!
98 // Note: (wide == false) does not protect the high order half of the target register
99 // from alternation. It only serves as optimization hint for 32-bit results.
100 void not_(Register r1, Register r2 = noreg, bool wide = false); // r1 = ~r2
101
102 // Expanded support of all "rotate_then_<logicalOP>" instructions.
103 //
104 // Generalize and centralize rotate_then_<logicalOP> emitter.
105 // Functional description. For details, see Principles of Operation, Chapter 7, "Rotate Then Insert..."
106 // - Bits in a register are numbered left (most significant) to right (least significant), i.e. [0..63].
107 // - Bytes in a register are numbered left (most significant) to right (least significant), i.e. [0..7].
108 // - Register src is rotated to the left by (nRotate&0x3f) positions.
109 // - Negative values for nRotate result in a rotation to the right by abs(nRotate) positions.
110 // - The bits in positions [lBitPos..rBitPos] of the _ROTATED_ src operand take part in the
111 // logical operation performed on the contents (in those positions) of the dst operand.
112 // - The logical operation that is performed on the dst operand is one of
113 // o insert the selected bits (replacing the original contents of those bit positions)
114 // o and the selected bits with the corresponding bits of the dst operand
115 // o or the selected bits with the corresponding bits of the dst operand
116 // o xor the selected bits with the corresponding bits of the dst operand
117 // - For clear_dst == true, the destination register is cleared before the bits are inserted.
118 // For clear_dst == false, only the bit positions that get data inserted from src
119 // are changed. All other bit positions remain unchanged.
120 // - For test_only == true, the result of the logicalOP is only used to set the condition code, dst remains unchanged.
121 // For test_only == false, the result of the logicalOP replaces the selected bits of dst.
122 // - src32bit and dst32bit indicate the respective register is used as 32bit value only.
123 // Knowledge can simplify code generation.
124 //
125 // Here is an important performance note, valid for all <logicalOP>s except "insert":
126 // Due to the too complex nature of the operation, it cannot be done in a single cycle.
127 // Timing constraints require the instructions to be cracked into two micro-ops, taking
128 // one or two cycles each to execute. In some cases, an additional pipeline bubble might get added.
129 // Macroscopically, that makes up for a three- or four-cycle instruction where you would
130 // expect just a single cycle.
131 // It is thus not beneficial from a performance point of view to exploit those instructions.
132 // Other reasons (code compactness, register pressure, ...) might outweigh this penalty.
133 //
134 unsigned long create_mask(int lBitPos, int rBitPos);
135 void rotate_then_mask(Register dst, Register src, int lBitPos, int rBitPos,
136 int nRotate, bool src32bit, bool dst32bit, bool oneBits);
137 void rotate_then_insert(Register dst, Register src, int lBitPos, int rBitPos, int nRotate,
138 bool clear_dst);
139 void rotate_then_and(Register dst, Register src, int lBitPos, int rBitPos, int nRotate,
140 bool test_only);
141 void rotate_then_or(Register dst, Register src, int lBitPos, int rBitPos, int nRotate,
142 bool test_onlyt);
143 void rotate_then_xor(Register dst, Register src, int lBitPos, int rBitPos, int nRotate,
144 bool test_only);
145
146 void add64(Register r1, RegisterOrConstant inc);
147
148 // Helper function to multiply the 64bit contents of a register by a 16bit constant.
149 // The optimization tries to avoid the mghi instruction, since it uses the FPU for
150 // calculation and is thus rather slow.
151 //
152 // There is no handling for special cases, e.g. cval==0 or cval==1.
153 //
154 // Returns len of generated code block.
155 unsigned int mul_reg64_const16(Register rval, Register work, int cval);
156
157 // Generic operation r1 := r2 + imm.
158 void add2reg(Register r1, int64_t imm, Register r2 = noreg);
159 // Generic operation r := b + x + d.
160 void add2reg_with_index(Register r, int64_t d, Register x, Register b = noreg);
161
162 // Add2mem* methods for direct memory increment.
163 void add2mem_32(const Address &a, int64_t imm, Register tmp);
164 void add2mem_64(const Address &a, int64_t imm, Register tmp);
165
166 // *((int8_t*)(dst)) |= imm8
167 inline void or2mem_8(Address& dst, int64_t imm8);
168
169 // Load values by size and signedness.
170 void load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed);
171 void store_sized_value(Register src, Address dst, size_t size_in_bytes);
172
173 // Load values with large offsets to base address.
174 private:
175 int split_largeoffset(int64_t si20_offset, Register tmp, bool fixed_codelen, bool accumulate);
176 public:
177 void load_long_largeoffset(Register t, int64_t si20, Register a, Register tmp);
178 void load_float_largeoffset(FloatRegister t, int64_t si20, Register a, Register tmp);
179 void load_double_largeoffset(FloatRegister t, int64_t si20, Register a, Register tmp);
180
181 private:
182 long toc_distance();
183 public:
184 void load_toc(Register Rtoc);
185 void load_long_pcrelative(Register Rdst, address dataLocation);
186 static int load_long_pcrelative_size() { return 6; }
187 void load_addr_pcrelative(Register Rdst, address dataLocation);
188 static int load_addr_pcrel_size() { return 6; } // Just a LARL.
189
190 // Load a value from memory and test (set CC).
191 void load_and_test_byte (Register dst, const Address &a);
192 void load_and_test_short (Register dst, const Address &a);
193 void load_and_test_int (Register dst, const Address &a);
194 void load_and_test_int2long(Register dst, const Address &a);
195 void load_and_test_long (Register dst, const Address &a);
196
197 // Test a bit in memory. Result is reflected in CC.
198 void testbit(const Address &a, unsigned int bit);
199 // Test a bit in a register. Result is reflected in CC.
200 void testbit(Register r, unsigned int bitPos);
201
202 void prefetch_read(Address a);
203 void prefetch_update(Address a);
204
205 // Clear a register, i.e. load const zero into reg. Return len (in bytes) of
206 // generated instruction(s).
207 // whole_reg: Clear 64 bits if true, 32 bits otherwise.
208 // set_cc: Use instruction that sets the condition code, if true.
209 int clear_reg(Register r, bool whole_reg = true, bool set_cc = true);
210
211 #ifdef ASSERT
212 int preset_reg(Register r, unsigned long pattern, int pattern_len);
213 #endif
214
215 // Clear (store zeros) a small piece of memory.
216 // CAUTION: Do not use this for atomic memory clearing. Use store_const() instead.
217 // addr: Address descriptor of memory to clear.
218 // Index register will not be used!
219 // size: Number of bytes to clear.
220 void clear_mem(const Address& addr, unsigned size);
221
222 // Move immediate values to memory. Currently supports 32 and 64 bit stores,
223 // but may be extended to 16 bit store operation, if needed.
224 // For details, see implementation in *.cpp file.
225 int store_const(const Address &dest, long imm,
226 unsigned int lm, unsigned int lc,
227 Register scratch = Z_R0);
228 inline int store_const(const Address &dest, long imm,
229 Register scratch = Z_R0, bool is_long = true);
230
231 // Move/initialize arbitrarily large memory area. No check for destructive overlap.
232 // Being interruptible, these instructions need a retry-loop.
233 void move_long_ext(Register dst, Register src, unsigned int pad);
234
235 void compare_long_ext(Register left, Register right, unsigned int pad);
236 void compare_long_uni(Register left, Register right, unsigned int pad);
237
238 void search_string(Register end, Register start);
239 void search_string_uni(Register end, Register start);
240
241 // Translate instructions
242 // Being interruptible, these instructions need a retry-loop.
243 void translate_oo(Register dst, Register src, uint mask);
244 void translate_ot(Register dst, Register src, uint mask);
245 void translate_to(Register dst, Register src, uint mask);
246 void translate_tt(Register dst, Register src, uint mask);
247
248 // Crypto instructions.
249 // Being interruptible, these instructions need a retry-loop.
250 void cksm(Register crcBuff, Register srcBuff);
251 void km( Register dstBuff, Register srcBuff);
252 void kmc(Register dstBuff, Register srcBuff);
253 void kimd(Register srcBuff);
254 void klmd(Register srcBuff);
255 void kmac(Register srcBuff);
256
257 // nop padding
258 void align(int modulus);
259 void align_address(int modulus);
260
261 //
262 // Constants, loading constants, TOC support
263 //
264
265 // Load generic address: d <- base(a) + index(a) + disp(a).
266 inline void load_address(Register d, const Address &a);
267 // Load absolute address (and try to optimize).
268 void load_absolute_address(Register d, address addr);
269
270 // Address of Z_ARG1 and argument_offset.
271 // If temp_reg == arg_slot, arg_slot will be overwritten.
272 Address argument_address(RegisterOrConstant arg_slot,
273 Register temp_reg = noreg,
274 int64_t extra_slot_offset = 0);
275
276 // Load a narrow ptr constant (oop or klass ptr).
277 void load_narrow_oop( Register t, narrowOop a);
278 void load_narrow_klass(Register t, Klass* k);
279
280 static bool is_load_const_32to64(address pos);
281 static bool is_load_narrow_oop(address pos) { return is_load_const_32to64(pos); }
282 static bool is_load_narrow_klass(address pos) { return is_load_const_32to64(pos); }
283
284 static int load_const_32to64_size() { return 6; }
285 static bool load_narrow_oop_size() { return load_const_32to64_size(); }
286 static bool load_narrow_klass_size() { return load_const_32to64_size(); }
287
288 static int patch_load_const_32to64(address pos, int64_t a);
289 static int patch_load_narrow_oop(address pos, oop o);
290 static int patch_load_narrow_klass(address pos, Klass* k);
291
292 // cOops. CLFI exploit.
293 void compare_immediate_narrow_oop(Register oop1, narrowOop oop2);
294 void compare_immediate_narrow_klass(Register op1, Klass* op2);
295 static bool is_compare_immediate32(address pos);
296 static bool is_compare_immediate_narrow_oop(address pos);
297 static bool is_compare_immediate_narrow_klass(address pos);
298 static int compare_immediate_narrow_size() { return 6; }
299 static int compare_immediate_narrow_oop_size() { return compare_immediate_narrow_size(); }
300 static int compare_immediate_narrow_klass_size() { return compare_immediate_narrow_size(); }
301 static int patch_compare_immediate_32(address pos, int64_t a);
302 static int patch_compare_immediate_narrow_oop(address pos, oop o);
303 static int patch_compare_immediate_narrow_klass(address pos, Klass* k);
304
305 // Load a 32bit constant into a 64bit register.
306 void load_const_32to64(Register t, int64_t x, bool sign_extend=true);
307 // Load a 64 bit constant.
308 void load_const(Register t, long a);
309 inline void load_const(Register t, void* a);
310 inline void load_const(Register t, Label& L);
311 inline void load_const(Register t, const AddressLiteral& a);
312 // Get the 64 bit constant from a `load_const' sequence.
313 static long get_const(address load_const);
314 // Patch the 64 bit constant of a `load_const' sequence. This is a low level
315 // procedure. It neither flushes the instruction cache nor is it atomic.
316 static void patch_const(address load_const, long x);
317 static int load_const_size() { return 12; }
318
319 // Turn a char into boolean. NOTE: destroys r.
320 void c2bool(Register r, Register t = Z_R0);
321
322 // Optimized version of load_const for constants that do not need to be
323 // loaded by a sequence of instructions of fixed length and that do not
324 // need to be patched.
325 int load_const_optimized_rtn_len(Register t, long x, bool emit);
326 inline void load_const_optimized(Register t, long x);
327 inline void load_const_optimized(Register t, void* a);
328 inline void load_const_optimized(Register t, Label& L);
329 inline void load_const_optimized(Register t, const AddressLiteral& a);
330
331 public:
332
333 //----------------------------------------------------------
334 // oops in code -------------
335 // including compressed oops support -------------
336 //----------------------------------------------------------
337
338 // Metadata in code that we have to keep track of.
339 AddressLiteral allocate_metadata_address(Metadata* obj); // allocate_index
340 AddressLiteral constant_metadata_address(Metadata* obj); // find_index
341
342 // allocate_index
343 AddressLiteral allocate_oop_address(jobject obj);
344 // find_index
345 AddressLiteral constant_oop_address(jobject obj);
346 // Uses allocate_oop_address.
347 inline void set_oop (jobject obj, Register d);
348 // Uses constant_oop_address.
349 inline void set_oop_constant(jobject obj, Register d);
350 // Uses constant_metadata_address.
351 inline bool set_metadata_constant(Metadata* md, Register d);
352
353 virtual RegisterOrConstant delayed_value_impl(intptr_t* delayed_value_addr,
354 Register tmp,
355 int offset);
356 //
357 // branch, jump
358 //
359
360 // Use one generic function for all branch patches.
361 static unsigned long patched_branch(address dest_pos, unsigned long inst, address inst_pos);
362
363 void pd_patch_instruction(address branch, address target, const char* file, int line);
364
365 // Extract relative address from "relative" instructions.
366 static long get_pcrel_offset(unsigned long inst);
367 static long get_pcrel_offset(address pc);
368 static address get_target_addr_pcrel(address pc);
369
370 static inline bool is_call_pcrelative_short(unsigned long inst);
371 static inline bool is_call_pcrelative_long(unsigned long inst);
372 static inline bool is_branch_pcrelative_short(unsigned long inst);
373 static inline bool is_branch_pcrelative_long(unsigned long inst);
374 static inline bool is_compareandbranch_pcrelative_short(unsigned long inst);
375 static inline bool is_branchoncount_pcrelative_short(unsigned long inst);
376 static inline bool is_branchonindex32_pcrelative_short(unsigned long inst);
377 static inline bool is_branchonindex64_pcrelative_short(unsigned long inst);
378 static inline bool is_branchonindex_pcrelative_short(unsigned long inst);
379 static inline bool is_branch_pcrelative16(unsigned long inst);
380 static inline bool is_branch_pcrelative32(unsigned long inst);
381 static inline bool is_branch_pcrelative(unsigned long inst);
382 static inline bool is_load_pcrelative_long(unsigned long inst);
383 static inline bool is_misc_pcrelative_long(unsigned long inst);
384 static inline bool is_pcrelative_short(unsigned long inst);
385 static inline bool is_pcrelative_long(unsigned long inst);
386 // PCrelative TOC access. Variants with address argument.
387 static inline bool is_load_pcrelative_long(address iLoc);
388 static inline bool is_pcrelative_short(address iLoc);
389 static inline bool is_pcrelative_long(address iLoc);
390
391 static inline bool is_pcrelative_instruction(address iloc);
392 static inline bool is_load_addr_pcrel(address a);
393
394 static void patch_target_addr_pcrel(address pc, address con);
395 static void patch_addr_pcrel(address pc, address con) {
396 patch_target_addr_pcrel(pc, con); // Just delegate. This is only for nativeInst_s390.cpp.
397 }
398
399 //---------------------------------------------------------
400 // Some macros for more comfortable assembler programming.
401 //---------------------------------------------------------
402
403 // NOTE: pass NearLabel T to signal that the branch target T will be bound to a near address.
404
405 void compare32_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& target);
406 void compareU32_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& target);
407 void compare64_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& target);
408 void compareU64_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& target);
409
410 void branch_optimized(Assembler::branch_condition cond, address branch_target);
411 void branch_optimized(Assembler::branch_condition cond, Label& branch_target);
412 void compare_and_branch_optimized(Register r1,
413 Register r2,
414 Assembler::branch_condition cond,
415 address branch_addr,
416 bool len64,
417 bool has_sign);
418 void compare_and_branch_optimized(Register r1,
419 jlong x2,
420 Assembler::branch_condition cond,
421 Label& branch_target,
422 bool len64,
423 bool has_sign);
424 void compare_and_branch_optimized(Register r1,
425 Register r2,
426 Assembler::branch_condition cond,
427 Label& branch_target,
428 bool len64,
429 bool has_sign);
430
431 //
432 // Support for frame handling
433 //
434 // Specify the register that should be stored as the return pc in the
435 // current frame (default is R14).
436 inline void save_return_pc(Register pc = Z_R14);
437 inline void restore_return_pc();
438
439 // Get current PC.
440 address get_PC(Register result);
441
442 // Get current PC + offset. Offset given in bytes, must be even!
443 address get_PC(Register result, int64_t offset);
444
445 // Get size of instruction at pc (which must point to valid code).
446 void instr_size(Register size, Register pc);
447
448 // Accessing, and in particular modifying, a stack location is only safe if
449 // the stack pointer (Z_SP) is set such that the accessed stack location is
450 // in the reserved range.
451 //
452 // From a performance point of view, it is desirable not to change the SP
453 // first and then immediately use it to access the freshly reserved space.
454 // That opens a small gap, though. If, just after storing some value (the
455 // frame pointer) into the to-be-reserved space, an interrupt is caught,
456 // the handler might use the space beyond Z_SP for it's own purpose.
457 // If that happens, the stored value might get altered.
458
459 // Resize current frame either relatively wrt to current SP or absolute.
460 void resize_frame_sub(Register offset, Register fp, bool load_fp=true);
461 void resize_frame_abs_with_offset(Register newSP, Register fp, int offset, bool load_fp);
462 void resize_frame_absolute(Register addr, Register fp, bool load_fp);
463 void resize_frame(RegisterOrConstant offset, Register fp, bool load_fp=true);
464
465 // Push a frame of size bytes, if copy_sp is false, old_sp must already
466 // contain a copy of Z_SP.
467 void push_frame(Register bytes, Register old_sp, bool copy_sp = true, bool bytes_with_inverted_sign = false);
468
469 // Push a frame of size `bytes'. no abi space provided.
470 // Don't rely on register locking, instead pass a scratch register
471 // (Z_R0 by default).
472 // CAUTION! passing registers >= Z_R2 may produce bad results on
473 // old CPUs!
474 unsigned int push_frame(unsigned int bytes, Register scratch = Z_R0);
475
476 // Push a frame of size `bytes' with abi160 on top.
477 unsigned int push_frame_abi160(unsigned int bytes);
478
479 // Pop current C frame.
480 void pop_frame();
481 // Pop current C frame and restore return PC register (Z_R14).
482 void pop_frame_restore_retPC(int frame_size_in_bytes);
483
484 //
485 // Calls
486 //
487
488 private:
489 address _last_calls_return_pc;
490
491 public:
492 // Support for VM calls. This is the base routine called by the
493 // different versions of call_VM_leaf. The interpreter may customize
494 // this version by overriding it for its purposes (e.g., to
495 // save/restore additional registers when doing a VM call).
496 void call_VM_leaf_base(address entry_point);
497 void call_VM_leaf_base(address entry_point, bool allow_relocation);
498
499 // It is imperative that all calls into the VM are handled via the
500 // call_VM macros. They make sure that the stack linkage is setup
501 // correctly. Call_VM's correspond to ENTRY/ENTRY_X entry points
502 // while call_VM_leaf's correspond to LEAF entry points.
503 //
504 // This is the base routine called by the different versions of
505 // call_VM. The interpreter may customize this version by overriding
506 // it for its purposes (e.g., to save/restore additional registers
507 // when doing a VM call).
508
509 // If no last_java_sp is specified (noreg) then SP will be used instead.
510
511 virtual void call_VM_base(
512 Register oop_result, // Where an oop-result ends up if any; use noreg otherwise.
513 Register last_java_sp, // To set up last_Java_frame in stubs; use noreg otherwise.
514 address entry_point, // The entry point.
515 bool check_exception); // Flag which indicates if exception should be checked.
516 virtual void call_VM_base(
517 Register oop_result, // Where an oop-result ends up if any; use noreg otherwise.
518 Register last_java_sp, // To set up last_Java_frame in stubs; use noreg otherwise.
519 address entry_point, // The entry point.
520 bool allow_relocation, // Flag to request generation of relocatable code.
521 bool check_exception); // Flag which indicates if exception should be checked.
522
523 // Call into the VM.
524 // Passes the thread pointer (in Z_ARG1) as a prepended argument.
525 // Makes sure oop return values are visible to the GC.
526 void call_VM(Register oop_result, address entry_point, bool check_exceptions = true);
527 void call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions = true);
528 void call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions = true);
529 void call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2,
530 Register arg_3, bool check_exceptions = true);
531
532 void call_VM_static(Register oop_result, address entry_point, bool check_exceptions = true);
533 void call_VM_static(Register oop_result, address entry_point, Register arg_1, Register arg_2,
534 Register arg_3, bool check_exceptions = true);
535
536 // Overloaded with last_java_sp.
537 void call_VM(Register oop_result, Register last_java_sp, address entry_point, bool check_exceptions = true);
538 void call_VM(Register oop_result, Register last_java_sp, address entry_point,
539 Register arg_1, bool check_exceptions = true);
540 void call_VM(Register oop_result, Register last_java_sp, address entry_point,
541 Register arg_1, Register arg_2, bool check_exceptions = true);
542 void call_VM(Register oop_result, Register last_java_sp, address entry_point,
543 Register arg_1, Register arg_2, Register arg_3, bool check_exceptions = true);
544
545 void call_VM_leaf(address entry_point);
546 void call_VM_leaf(address entry_point, Register arg_1);
547 void call_VM_leaf(address entry_point, Register arg_1, Register arg_2);
548 void call_VM_leaf(address entry_point, Register arg_1, Register arg_2, Register arg_3);
549
550 // Really static VM leaf call (never patched).
551 void call_VM_leaf_static(address entry_point);
552 void call_VM_leaf_static(address entry_point, Register arg_1);
553 void call_VM_leaf_static(address entry_point, Register arg_1, Register arg_2);
554 void call_VM_leaf_static(address entry_point, Register arg_1, Register arg_2, Register arg_3);
555
556 // Call a C function via its function entry. Updates and returns _last_calls_return_pc.
557 inline address call(Register function_entry);
558 inline address call_c(Register function_entry);
559 address call_c(address function_entry);
560 // Variant for really static (non-relocatable) calls which are never patched.
561 address call_c_static(address function_entry);
562 // TOC or pc-relative call + emits a runtime_call relocation.
563 address call_c_opt(address function_entry);
564
565 inline address call_stub(Register function_entry);
566 inline address call_stub(address function_entry);
567
568 // Get the pc where the last call will return to. Returns _last_calls_return_pc.
569 inline address last_calls_return_pc();
570
571 private:
572 static bool is_call_far_patchable_variant0_at(address instruction_addr); // Dynamic TOC: load target addr from CP and call.
573 static bool is_call_far_patchable_variant2_at(address instruction_addr); // PC-relative call, prefixed with NOPs.
574
575
576 public:
577 bool call_far_patchable(address target, int64_t toc_offset);
578 static bool is_call_far_patchable_at(address inst_start); // All supported forms of patchable calls.
579 static bool is_call_far_patchable_pcrelative_at(address inst_start); // Pc-relative call with leading nops.
580 static bool is_call_far_pcrelative(address instruction_addr); // Pure far pc-relative call, with one leading size adjustment nop.
581 static void set_dest_of_call_far_patchable_at(address inst_start, address target, int64_t toc_offset);
582 static address get_dest_of_call_far_patchable_at(address inst_start, address toc_start);
583
584 void align_call_far_patchable(address pc);
585
586 // PCrelative TOC access.
587
588 // This value is independent of code position - constant for the lifetime of the VM.
589 static int call_far_patchable_size() {
590 return load_const_from_toc_size() + call_byregister_size();
591 }
592
593 static int call_far_patchable_ret_addr_offset() { return call_far_patchable_size(); }
594
595 static bool call_far_patchable_requires_alignment_nop(address pc) {
596 if (!os::is_MP()) return false;
597 int size = call_far_patchable_size();
598 return ((intptr_t)(pc + size) & 0x03L) != 0;
599 }
600
601 // END OF PCrelative TOC access.
602
603 static int jump_byregister_size() { return 2; }
604 static int jump_pcrelative_size() { return 4; }
605 static int jump_far_pcrelative_size() { return 6; }
606 static int call_byregister_size() { return 2; }
607 static int call_pcrelative_size() { return 4; }
608 static int call_far_pcrelative_size() { return 2 + 6; } // Prepend each BRASL with a nop.
609 static int call_far_pcrelative_size_raw() { return 6; } // Prepend each BRASL with a nop.
610
611 //
612 // Java utilities
613 //
614
615 // These routines should emit JVMTI PopFrame and ForceEarlyReturn handling code.
616 // The implementation is only non-empty for the InterpreterMacroAssembler,
617 // as only the interpreter handles PopFrame and ForceEarlyReturn requests.
618 virtual void check_and_handle_popframe(Register java_thread);
619 virtual void check_and_handle_earlyret(Register java_thread);
620
621 // Polling page support.
622 enum poll_mask {
623 mask_stackbang = 0xde, // 222 (dec)
624 mask_safepoint = 0x6f, // 111 (dec)
625 mask_profiling = 0xba // 186 (dec)
626 };
627
628 // Read from the polling page.
629 void load_from_polling_page(Register polling_page_address, int64_t offset = 0);
630
631 // Check if given instruction is a read from the polling page
632 // as emitted by load_from_polling_page.
633 static bool is_load_from_polling_page(address instr_loc);
634 // Extract poll address from instruction and ucontext.
635 static address get_poll_address(address instr_loc, void* ucontext);
636 // Extract poll register from instruction.
637 static uint get_poll_register(address instr_loc);
638
639 // Check if instruction is a write access to the memory serialization page
640 // realized by one of the instructions stw, stwu, stwx, or stwux.
641 static bool is_memory_serialization(int instruction, JavaThread* thread, void* ucontext);
642
643 // Support for serializing memory accesses between threads.
644 void serialize_memory(Register thread, Register tmp1, Register tmp2);
645
646 // Check if safepoint requested and if so branch
647 void safepoint_poll(Label& slow_path, Register temp_reg);
648
649 // Stack overflow checking
650 void bang_stack_with_offset(int offset);
651
652 // Check for reserved stack access in method being exited. If the reserved
653 // stack area was accessed, protect it again and throw StackOverflowError.
654 // Uses Z_R1.
655 void reserved_stack_check(Register return_pc);
656
657 // Atomics
658 // -- none?
659
660 void tlab_allocate(Register obj, // Result: pointer to object after successful allocation
661 Register var_size_in_bytes, // Object size in bytes if unknown at compile time; invalid otherwise.
662 int con_size_in_bytes, // Object size in bytes if known at compile time.
663 Register t1, // temp register
664 Label& slow_case); // Continuation point if fast allocation fails.
665
666 // Emitter for interface method lookup.
667 // input: recv_klass, intf_klass, itable_index
668 // output: method_result
669 // kills: itable_index, temp1_reg, Z_R0, Z_R1
670 void lookup_interface_method(Register recv_klass,
671 Register intf_klass,
672 RegisterOrConstant itable_index,
673 Register method_result,
674 Register temp1_reg,
675 Label& no_such_interface,
676 bool return_method = true);
677
678 // virtual method calling
679 void lookup_virtual_method(Register recv_klass,
680 RegisterOrConstant vtable_index,
681 Register method_result);
682
683 // Factor out code to call ic_miss_handler.
684 unsigned int call_ic_miss_handler(Label& ICM, int trapMarker, int requiredSize, Register scratch);
685 void nmethod_UEP(Label& ic_miss);
686
687 // Emitters for "partial subtype" checks.
688
689 // Test sub_klass against super_klass, with fast and slow paths.
690
691 // The fast path produces a tri-state answer: yes / no / maybe-slow.
692 // One of the three labels can be NULL, meaning take the fall-through.
693 // If super_check_offset is -1, the value is loaded up from super_klass.
694 // No registers are killed, except temp_reg and temp2_reg.
695 // If super_check_offset is not -1, temp1_reg is not used and can be noreg.
696 void check_klass_subtype_fast_path(Register sub_klass,
697 Register super_klass,
698 Register temp1_reg,
699 Label* L_success,
700 Label* L_failure,
701 Label* L_slow_path,
702 RegisterOrConstant super_check_offset = RegisterOrConstant(-1));
703
704 // The rest of the type check; must be wired to a corresponding fast path.
705 // It does not repeat the fast path logic, so don't use it standalone.
706 // The temp_reg can be noreg, if no temps are available.
707 // It can also be sub_klass or super_klass, meaning it's OK to kill that one.
708 // Updates the sub's secondary super cache as necessary.
709 void check_klass_subtype_slow_path(Register Rsubklass,
710 Register Rsuperklas,
711 Register Rarray_ptr, // tmp
712 Register Rlength, // tmp
713 Label* L_success,
714 Label* L_failure);
715
716 // Simplified, combined version, good for typical uses.
717 // Falls through on failure.
718 void check_klass_subtype(Register sub_klass,
719 Register super_klass,
720 Register temp1_reg,
721 Register temp2_reg,
722 Label& L_success);
723
724 // Increment a counter at counter_address when the eq condition code is set.
725 // Kills registers tmp1_reg and tmp2_reg and preserves the condition code.
726 void increment_counter_eq(address counter_address, Register tmp1_reg, Register tmp2_reg);
727 // Biased locking support
728 // Upon entry,obj_reg must contain the target object, and mark_reg
729 // must contain the target object's header.
730 // Destroys mark_reg if an attempt is made to bias an anonymously
731 // biased lock. In this case a failure will go either to the slow
732 // case or fall through with the notEqual condition code set with
733 // the expectation that the slow case in the runtime will be called.
734 // In the fall-through case where the CAS-based lock is done,
735 // mark_reg is not destroyed.
736 void biased_locking_enter(Register obj_reg, Register mark_reg, Register temp_reg,
737 Register temp2_reg, Label& done, Label* slow_case = NULL);
738 // Upon entry, the base register of mark_addr must contain the oop.
739 // Destroys temp_reg.
740 // If allow_delay_slot_filling is set to true, the next instruction
741 // emitted after this one will go in an annulled delay slot if the
742 // biased locking exit case failed.
743 void biased_locking_exit(Register mark_addr, Register temp_reg, Label& done);
744
745 void compiler_fast_lock_object(Register oop, Register box, Register temp1, Register temp2, bool try_bias = UseBiasedLocking);
746 void compiler_fast_unlock_object(Register oop, Register box, Register temp1, Register temp2, bool try_bias = UseBiasedLocking);
747
748 void resolve_jobject(Register value, Register tmp1, Register tmp2);
749
750 // Support for last Java frame (but use call_VM instead where possible).
751 private:
752 void set_last_Java_frame(Register last_Java_sp, Register last_Java_pc, bool allow_relocation);
753 void reset_last_Java_frame(bool allow_relocation);
754 void set_top_ijava_frame_at_SP_as_last_Java_frame(Register sp, Register tmp1, bool allow_relocation);
755 public:
756 inline void set_last_Java_frame(Register last_java_sp, Register last_Java_pc);
757 inline void set_last_Java_frame_static(Register last_java_sp, Register last_Java_pc);
758 inline void reset_last_Java_frame(void);
759 inline void reset_last_Java_frame_static(void);
760 inline void set_top_ijava_frame_at_SP_as_last_Java_frame(Register sp, Register tmp1);
761 inline void set_top_ijava_frame_at_SP_as_last_Java_frame_static(Register sp, Register tmp1);
762
763 void set_thread_state(JavaThreadState new_state);
764
765 // Read vm result from thread.
766 void get_vm_result (Register oop_result);
767 void get_vm_result_2(Register result);
768
769 // Vm result is currently getting hijacked to for oop preservation.
770 void set_vm_result(Register oop_result);
771
772 // Support for NULL-checks
773 //
774 // Generates code that causes a NULL OS exception if the content of reg is NULL.
775 // If the accessed location is M[reg + offset] and the offset is known, provide the
776 // offset. No explicit code generation is needed if the offset is within a certain
777 // range (0 <= offset <= page_size).
778 //
779 // %%%%%% Currently not done for z/Architecture
780
781 void null_check(Register reg, Register tmp = Z_R0, int64_t offset = -1);
782 static bool needs_explicit_null_check(intptr_t offset); // Implemented in shared file ?!
783
784 // Klass oop manipulations if compressed.
785 void encode_klass_not_null(Register dst, Register src = noreg);
786 void decode_klass_not_null(Register dst, Register src);
787 void decode_klass_not_null(Register dst);
788 void load_klass(Register klass, Address mem);
789 void load_klass(Register klass, Register src_oop);
790 void load_prototype_header(Register Rheader, Register Rsrc_oop);
791 void store_klass(Register klass, Register dst_oop, Register ck = noreg); // Klass will get compressed if ck not provided.
792 void store_klass_gap(Register s, Register dst_oop);
793
794 // This function calculates the size of the code generated by
795 // decode_klass_not_null(register dst)
796 // when (Universe::heap() != NULL). Hence, if the instructions
797 // it generates change, then this method needs to be updated.
798 static int instr_size_for_decode_klass_not_null();
799
800 void encode_heap_oop(Register oop);
801 void encode_heap_oop_not_null(Register oop);
802
803 static int get_oop_base_pow2_offset(uint64_t oop_base);
804 int get_oop_base(Register Rbase, uint64_t oop_base);
805 int get_oop_base_complement(Register Rbase, uint64_t oop_base);
806 void compare_heap_oop(Register Rop1, Address mem, bool maybeNULL);
807 void compare_klass_ptr(Register Rop1, int64_t disp, Register Rbase, bool maybeNULL);
808
809 // Access heap oop, handle encoding and GC barriers.
810 private:
811 void access_store_at(BasicType type, DecoratorSet decorators,
812 const Address& addr, Register val,
813 Register tmp1, Register tmp2, Register tmp3);
814 void access_load_at(BasicType type, DecoratorSet decorators,
815 const Address& addr, Register dst,
816 Register tmp1, Register tmp2, Label *is_null = NULL);
817
818 public:
819 // tmp1 and tmp2 are used with decorators ON_PHANTOM_OOP_REF or ON_WEAK_OOP_REF.
820 void load_heap_oop(Register dest, const Address &a,
821 Register tmp1, Register tmp2,
822 DecoratorSet decorators = 0, Label *is_null = NULL);
823 void store_heap_oop(Register Roop, const Address &a,
824 Register tmp1, Register tmp2, Register tmp3,
825 DecoratorSet decorators = 0);
826
827 void oop_encoder(Register Rdst, Register Rsrc, bool maybeNULL,
828 Register Rbase = Z_R1, int pow2_offset = -1, bool only32bitValid = false);
829 void oop_decoder(Register Rdst, Register Rsrc, bool maybeNULL,
830 Register Rbase = Z_R1, int pow2_offset = -1);
831
832 void resolve_oop_handle(Register result);
833 void load_mirror(Register mirror, Register method);
834
835 //--------------------------
836 //--- Operations on arrays.
837 //--------------------------
838 unsigned int Clear_Array(Register cnt_arg, Register base_pointer_arg, Register src_addr, Register src_len);
839 unsigned int Clear_Array_Const(long cnt, Register base);
840 unsigned int Clear_Array_Const_Big(long cnt, Register base_pointer_arg, Register src_addr, Register src_len);
841 unsigned int CopyRawMemory_AlignedDisjoint(Register src_reg, Register dst_reg,
842 Register cnt_reg,
843 Register tmp1_reg, Register tmp2_reg);
844
845 //-------------------------------------------
846 // Special String Intrinsics Implementation.
847 //-------------------------------------------
848 // Intrinsics for CompactStrings
849 // Restores: src, dst
850 // Uses: cnt
851 // Kills: tmp, Z_R0, Z_R1.
852 // Early clobber: result.
853 // Boolean precise controls accuracy of result value.
854 unsigned int string_compress(Register result, Register src, Register dst, Register cnt,
855 Register tmp, bool precise);
856
857 // Inflate byte[] to char[].
858 unsigned int string_inflate_trot(Register src, Register dst, Register cnt, Register tmp);
859
860 // Inflate byte[] to char[].
861 // Restores: src, dst
862 // Uses: cnt
863 // Kills: tmp, Z_R0, Z_R1.
864 unsigned int string_inflate(Register src, Register dst, Register cnt, Register tmp);
865
866 // Inflate byte[] to char[], length known at compile time.
867 // Restores: src, dst
868 // Kills: tmp, Z_R0, Z_R1.
869 // Note:
870 // len is signed int. Counts # characters, not bytes.
871 unsigned int string_inflate_const(Register src, Register dst, Register tmp, int len);
872
873 // Kills src.
874 unsigned int has_negatives(Register result, Register src, Register cnt,
875 Register odd_reg, Register even_reg, Register tmp);
876
877 unsigned int string_compare(Register str1, Register str2, Register cnt1, Register cnt2,
878 Register odd_reg, Register even_reg, Register result, int ae);
879
880 unsigned int array_equals(bool is_array_equ, Register ary1, Register ary2, Register limit,
881 Register odd_reg, Register even_reg, Register result, bool is_byte);
882
883 unsigned int string_indexof(Register result, Register haystack, Register haycnt,
884 Register needle, Register needlecnt, int needlecntval,
885 Register odd_reg, Register even_reg, int ae);
886
887 unsigned int string_indexof_char(Register result, Register haystack, Register haycnt,
888 Register needle, jchar needleChar, Register odd_reg, Register even_reg, bool is_byte);
889
890 // Emit an oop const to the constant pool and set a relocation info
891 // with address current_pc. Return the TOC offset of the constant.
892 int store_const_in_toc(AddressLiteral& val);
893 int store_oop_in_toc(AddressLiteral& oop);
894 // Emit an oop const to the constant pool via store_oop_in_toc, or
895 // emit a scalar const to the constant pool via store_const_in_toc,
896 // and load the constant into register dst.
897 bool load_const_from_toc(Register dst, AddressLiteral& a, Register Rtoc = noreg);
898 // Get CPU version dependent size of load_const sequence.
899 // The returned value is valid only for code sequences
900 // generated by load_const, not load_const_optimized.
901 static int load_const_from_toc_size() {
902 return load_long_pcrelative_size();
903 }
904 bool load_oop_from_toc(Register dst, AddressLiteral& a, Register Rtoc = noreg);
905 static intptr_t get_const_from_toc(address pc);
906 static void set_const_in_toc(address pc, unsigned long new_data, CodeBlob *cb);
907
908 // Dynamic TOC.
909 static bool is_load_const(address a);
910 static bool is_load_const_from_toc_pcrelative(address a);
911 static bool is_load_const_from_toc(address a) { return is_load_const_from_toc_pcrelative(a); }
912
913 // PCrelative TOC access.
914 static bool is_call_byregister(address a) { return is_z_basr(*(short*)a); }
915 static bool is_load_const_from_toc_call(address a);
916 static bool is_load_const_call(address a);
917 static int load_const_call_size() { return load_const_size() + call_byregister_size(); }
918 static int load_const_from_toc_call_size() { return load_const_from_toc_size() + call_byregister_size(); }
919 // Offset is +/- 2**32 -> use long.
920 static long get_load_const_from_toc_offset(address a);
921
922
923 void generate_type_profiling(const Register Rdata,
924 const Register Rreceiver_klass,
925 const Register Rwanted_receiver_klass,
926 const Register Rmatching_row,
927 bool is_virtual_call);
928
929 // Bit operations for single register operands.
930 inline void lshift(Register r, int places, bool doubl = true); // <<
931 inline void rshift(Register r, int places, bool doubl = true); // >>
932
933 //
934 // Debugging
935 //
936
937 // Assert on CC (condition code in CPU state).
938 void asm_assert(bool check_equal, const char* msg, int id) PRODUCT_RETURN;
939 void asm_assert_low(const char *msg, int id) PRODUCT_RETURN;
940 void asm_assert_high(const char *msg, int id) PRODUCT_RETURN;
941 void asm_assert_eq(const char* msg, int id) { asm_assert(true, msg, id); }
942 void asm_assert_ne(const char* msg, int id) { asm_assert(false, msg, id); }
943
944 void asm_assert_static(bool check_equal, const char* msg, int id) PRODUCT_RETURN;
945
946 private:
947 // Emit assertions.
948 void asm_assert_mems_zero(bool check_equal, bool allow_relocation, int size, int64_t mem_offset,
949 Register mem_base, const char* msg, int id) PRODUCT_RETURN;
950
951 public:
952 inline void asm_assert_mem4_is_zero(int64_t mem_offset, Register mem_base, const char* msg, int id) {
953 asm_assert_mems_zero(true, true, 4, mem_offset, mem_base, msg, id);
954 }
955 inline void asm_assert_mem8_is_zero(int64_t mem_offset, Register mem_base, const char* msg, int id) {
956 asm_assert_mems_zero(true, true, 8, mem_offset, mem_base, msg, id);
957 }
958 inline void asm_assert_mem4_isnot_zero(int64_t mem_offset, Register mem_base, const char* msg, int id) {
959 asm_assert_mems_zero(false, true, 4, mem_offset, mem_base, msg, id);
960 }
961 inline void asm_assert_mem8_isnot_zero(int64_t mem_offset, Register mem_base, const char* msg, int id) {
962 asm_assert_mems_zero(false, true, 8, mem_offset, mem_base, msg, id);
963 }
964
965 inline void asm_assert_mem4_is_zero_static(int64_t mem_offset, Register mem_base, const char* msg, int id) {
966 asm_assert_mems_zero(true, false, 4, mem_offset, mem_base, msg, id);
967 }
968 inline void asm_assert_mem8_is_zero_static(int64_t mem_offset, Register mem_base, const char* msg, int id) {
969 asm_assert_mems_zero(true, false, 8, mem_offset, mem_base, msg, id);
970 }
971 inline void asm_assert_mem4_isnot_zero_static(int64_t mem_offset, Register mem_base, const char* msg, int id) {
972 asm_assert_mems_zero(false, false, 4, mem_offset, mem_base, msg, id);
973 }
974 inline void asm_assert_mem8_isnot_zero_static(int64_t mem_offset, Register mem_base, const char* msg, int id) {
975 asm_assert_mems_zero(false, false, 8, mem_offset, mem_base, msg, id);
976 }
977 void asm_assert_frame_size(Register expected_size, Register tmp, const char* msg, int id) PRODUCT_RETURN;
978
979 // Verify Z_thread contents.
980 void verify_thread();
981
982 // Only if +VerifyOops.
983 void verify_oop(Register reg, const char* s = "broken oop");
984
985 // TODO: verify_method and klass metadata (compare against vptr?).
986 void _verify_method_ptr(Register reg, const char * msg, const char * file, int line) {}
987 void _verify_klass_ptr(Register reg, const char * msg, const char * file, int line) {}
988
989 #define verify_method_ptr(reg) _verify_method_ptr(reg, "broken method " #reg, __FILE__, __LINE__)
990 #define verify_klass_ptr(reg) _verify_klass_ptr(reg, "broken klass " #reg, __FILE__, __LINE__)
991
992 private:
993 // Generate printout in stop().
994 static const char* stop_types[];
995 enum {
996 stop_stop = 0,
997 stop_untested = 1,
998 stop_unimplemented = 2,
999 stop_shouldnotreachhere = 3,
1000 stop_end = 4
1001 };
1002 // Prints msg and stops execution.
1003 void stop(int type, const char* msg, int id = 0);
1004 address stop_chain(address reentry, int type, const char* msg, int id, bool allow_relocation); // Non-relocateable code only!!
1005 void stop_static(int type, const char* msg, int id); // Non-relocateable code only!!
1006
1007 public:
1008
1009 // Prints msg and stops.
1010 address stop_chain( address reentry, const char* msg = "", int id = 0) { return stop_chain(reentry, stop_stop, msg, id, true); }
1011 address stop_chain_static(address reentry, const char* msg = "", int id = 0) { return stop_chain(reentry, stop_stop, msg, id, false); }
1012 void stop_static (const char* msg = "", int id = 0) { stop_static(stop_stop, msg, id); }
1013 void stop (const char* msg = "", int id = 0) { stop(stop_stop, msg, id); }
1014 void untested (const char* msg = "", int id = 0) { stop(stop_untested, msg, id); }
1015 void unimplemented(const char* msg = "", int id = 0) { stop(stop_unimplemented, msg, id); }
1016 void should_not_reach_here(const char* msg = "", int id = -1) { stop(stop_shouldnotreachhere, msg, id); }
1017
1018 // Factor out part of stop into subroutine to save space.
1019 void stop_subroutine();
1020
1021 // Prints msg, but don't stop.
1022 void warn(const char* msg);
1023
1024 //-----------------------------
1025 //--- basic block tracing code
1026 //-----------------------------
1027 void trace_basic_block(uint i);
1028 void init_basic_block_trace();
1029 // Number of bytes a basic block gets larger due to the tracing code macro (worst case).
1030 // Currently, worst case is 48 bytes. 64 puts us securely on the safe side.
1031 static int basic_blck_trace_blk_size_incr() { return 64; }
1032
1033 // Write pattern 0x0101010101010101 in region [low-before, high+after].
1034 // Low and high may be the same registers. Before and after are
1035 // the numbers of 8-byte words.
1036 void zap_from_to(Register low, Register high, Register tmp1 = Z_R0, Register tmp2 = Z_R1,
1037 int before = 0, int after = 0) PRODUCT_RETURN;
1038
1039 // Emitters for CRC32 calculation.
1040 // A note on invertCRC:
1041 // Unfortunately, internal representation of crc differs between CRC32 and CRC32C.
1042 // CRC32 holds it's current crc value in the externally visible representation.
1043 // CRC32C holds it's current crc value in internal format, ready for updating.
1044 // Thus, the crc value must be bit-flipped before updating it in the CRC32 case.
1045 // In the CRC32C case, it must be bit-flipped when it is given to the outside world (getValue()).
1046 // The bool invertCRC parameter indicates whether bit-flipping is required before updates.
1047 private:
1048 void fold_byte_crc32(Register crc, Register table, Register val, Register tmp);
1049 void fold_8bit_crc32(Register crc, Register table, Register tmp);
1050 void update_byte_crc32( Register crc, Register val, Register table);
1051 void update_byteLoop_crc32(Register crc, Register buf, Register len, Register table,
1052 Register data);
1053 void update_1word_crc32(Register crc, Register buf, Register table, int bufDisp, int bufInc,
1054 Register t0, Register t1, Register t2, Register t3);
1055 public:
1056 void kernel_crc32_singleByteReg(Register crc, Register val, Register table,
1057 bool invertCRC);
1058 void kernel_crc32_singleByte(Register crc, Register buf, Register len, Register table, Register tmp,
1059 bool invertCRC);
1060 void kernel_crc32_1byte(Register crc, Register buf, Register len, Register table,
1061 Register t0, Register t1, Register t2, Register t3,
1062 bool invertCRC);
1063 void kernel_crc32_1word(Register crc, Register buf, Register len, Register table,
1064 Register t0, Register t1, Register t2, Register t3,
1065 bool invertCRC);
1066 void kernel_crc32_2word(Register crc, Register buf, Register len, Register table,
1067 Register t0, Register t1, Register t2, Register t3,
1068 bool invertCRC);
1069
1070 // Emitters for BigInteger.multiplyToLen intrinsic
1071 // note: length of result array (zlen) is passed on the stack
1072 private:
1073 void add2_with_carry(Register dest_hi, Register dest_lo,
1074 Register src1, Register src2);
1075 void multiply_64_x_64_loop(Register x, Register xstart,
1076 Register x_xstart,
1077 Register y, Register y_idx, Register z,
1078 Register carry, Register product,
1079 Register idx, Register kdx);
1080 void multiply_add_128_x_128(Register x_xstart, Register y, Register z,
1081 Register yz_idx, Register idx,
1082 Register carry, Register product, int offset);
1083 void multiply_128_x_128_loop(Register x_xstart,
1084 Register y, Register z,
1085 Register yz_idx, Register idx,
1086 Register jdx,
1087 Register carry, Register product,
1088 Register carry2);
1089 public:
1090 void multiply_to_len(Register x, Register xlen,
1091 Register y, Register ylen,
1092 Register z,
1093 Register tmp1, Register tmp2,
1094 Register tmp3, Register tmp4, Register tmp5);
1095 };
1096
1097 /**
1098 * class SkipIfEqual:
1099 *
1100 * Instantiating this class will result in assembly code being output that will
1101 * jump around any code emitted between the creation of the instance and it's
1102 * automatic destruction at the end of a scope block, depending on the value of
1103 * the flag passed to the constructor, which will be checked at run-time.
1104 */
1105 class SkipIfEqual {
1106 private:
1107 MacroAssembler* _masm;
1108 Label _label;
1109
1110 public:
1111 SkipIfEqual(MacroAssembler*, const bool* flag_addr, bool value, Register _rscratch);
1112 ~SkipIfEqual();
1113 };
1114
1115 #ifdef ASSERT
1116 // Return false (e.g. important for our impl. of virtual calls).
1117 inline bool AbstractAssembler::pd_check_instruction_mark() { return false; }
1118 #endif
1119
1120 #endif // CPU_S390_VM_MACROASSEMBLER_S390_HPP