1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_stubGenerator_x86_32.cpp.incl"
  27 
  28 // Declaration and definition of StubGenerator (no .hpp file).
  29 // For a more detailed description of the stub routine structure
  30 // see the comment in stubRoutines.hpp
  31 
  32 #define __ _masm->
  33 #define a__ ((Assembler*)_masm)->
  34 
  35 #ifdef PRODUCT
  36 #define BLOCK_COMMENT(str) /* nothing */
  37 #else
  38 #define BLOCK_COMMENT(str) __ block_comment(str)
  39 #endif
  40 
  41 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
  42 
  43 const int MXCSR_MASK  = 0xFFC0;  // Mask out any pending exceptions
  44 const int FPU_CNTRL_WRD_MASK = 0xFFFF;
  45 
  46 // -------------------------------------------------------------------------------------------------------------------------
  47 // Stub Code definitions
  48 
  49 static address handle_unsafe_access() {
  50   JavaThread* thread = JavaThread::current();
  51   address pc  = thread->saved_exception_pc();
  52   // pc is the instruction which we must emulate
  53   // doing a no-op is fine:  return garbage from the load
  54   // therefore, compute npc
  55   address npc = Assembler::locate_next_instruction(pc);
  56 
  57   // request an async exception
  58   thread->set_pending_unsafe_access_error();
  59 
  60   // return address of next instruction to execute
  61   return npc;
  62 }
  63 
  64 class StubGenerator: public StubCodeGenerator {
  65  private:
  66 
  67 #ifdef PRODUCT
  68 #define inc_counter_np(counter) (0)
  69 #else
  70   void inc_counter_np_(int& counter) {
  71     __ incrementl(ExternalAddress((address)&counter));
  72   }
  73 #define inc_counter_np(counter) \
  74   BLOCK_COMMENT("inc_counter " #counter); \
  75   inc_counter_np_(counter);
  76 #endif //PRODUCT
  77 
  78   void inc_copy_counter_np(BasicType t) {
  79 #ifndef PRODUCT
  80     switch (t) {
  81     case T_BYTE:    inc_counter_np(SharedRuntime::_jbyte_array_copy_ctr); return;
  82     case T_SHORT:   inc_counter_np(SharedRuntime::_jshort_array_copy_ctr); return;
  83     case T_INT:     inc_counter_np(SharedRuntime::_jint_array_copy_ctr); return;
  84     case T_LONG:    inc_counter_np(SharedRuntime::_jlong_array_copy_ctr); return;
  85     case T_OBJECT:  inc_counter_np(SharedRuntime::_oop_array_copy_ctr); return;
  86     }
  87     ShouldNotReachHere();
  88 #endif //PRODUCT
  89   }
  90 
  91   //------------------------------------------------------------------------------------------------------------------------
  92   // Call stubs are used to call Java from C
  93   //
  94   //    [ return_from_Java     ] <--- rsp
  95   //    [ argument word n      ]
  96   //      ...
  97   // -N [ argument word 1      ]
  98   // -7 [ Possible padding for stack alignment ]
  99   // -6 [ Possible padding for stack alignment ]
 100   // -5 [ Possible padding for stack alignment ]
 101   // -4 [ mxcsr save           ] <--- rsp_after_call
 102   // -3 [ saved rbx,            ]
 103   // -2 [ saved rsi            ]
 104   // -1 [ saved rdi            ]
 105   //  0 [ saved rbp,            ] <--- rbp,
 106   //  1 [ return address       ]
 107   //  2 [ ptr. to call wrapper ]
 108   //  3 [ result               ]
 109   //  4 [ result_type          ]
 110   //  5 [ method               ]
 111   //  6 [ entry_point          ]
 112   //  7 [ parameters           ]
 113   //  8 [ parameter_size       ]
 114   //  9 [ thread               ]
 115 
 116 
 117   address generate_call_stub(address& return_address) {
 118     StubCodeMark mark(this, "StubRoutines", "call_stub");
 119     address start = __ pc();
 120 
 121     // stub code parameters / addresses
 122     assert(frame::entry_frame_call_wrapper_offset == 2, "adjust this code");
 123     bool  sse_save = false;
 124     const Address rsp_after_call(rbp, -4 * wordSize); // same as in generate_catch_exception()!
 125     const int     locals_count_in_bytes  (4*wordSize);
 126     const Address mxcsr_save    (rbp, -4 * wordSize);
 127     const Address saved_rbx     (rbp, -3 * wordSize);
 128     const Address saved_rsi     (rbp, -2 * wordSize);
 129     const Address saved_rdi     (rbp, -1 * wordSize);
 130     const Address result        (rbp,  3 * wordSize);
 131     const Address result_type   (rbp,  4 * wordSize);
 132     const Address method        (rbp,  5 * wordSize);
 133     const Address entry_point   (rbp,  6 * wordSize);
 134     const Address parameters    (rbp,  7 * wordSize);
 135     const Address parameter_size(rbp,  8 * wordSize);
 136     const Address thread        (rbp,  9 * wordSize); // same as in generate_catch_exception()!
 137     sse_save =  UseSSE > 0;
 138 
 139     // stub code
 140     __ enter();
 141     __ movptr(rcx, parameter_size);              // parameter counter
 142     __ shlptr(rcx, Interpreter::logStackElementSize); // convert parameter count to bytes
 143     __ addptr(rcx, locals_count_in_bytes);       // reserve space for register saves
 144     __ subptr(rsp, rcx);
 145     __ andptr(rsp, -(StackAlignmentInBytes));    // Align stack
 146 
 147     // save rdi, rsi, & rbx, according to C calling conventions
 148     __ movptr(saved_rdi, rdi);
 149     __ movptr(saved_rsi, rsi);
 150     __ movptr(saved_rbx, rbx);
 151     // save and initialize %mxcsr
 152     if (sse_save) {
 153       Label skip_ldmx;
 154       __ stmxcsr(mxcsr_save);
 155       __ movl(rax, mxcsr_save);
 156       __ andl(rax, MXCSR_MASK);    // Only check control and mask bits
 157       ExternalAddress mxcsr_std(StubRoutines::addr_mxcsr_std());
 158       __ cmp32(rax, mxcsr_std);
 159       __ jcc(Assembler::equal, skip_ldmx);
 160       __ ldmxcsr(mxcsr_std);
 161       __ bind(skip_ldmx);
 162     }
 163 
 164     // make sure the control word is correct.
 165     __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std()));
 166 
 167 #ifdef ASSERT
 168     // make sure we have no pending exceptions
 169     { Label L;
 170       __ movptr(rcx, thread);
 171       __ cmpptr(Address(rcx, Thread::pending_exception_offset()), (int32_t)NULL_WORD);
 172       __ jcc(Assembler::equal, L);
 173       __ stop("StubRoutines::call_stub: entered with pending exception");
 174       __ bind(L);
 175     }
 176 #endif
 177 
 178     // pass parameters if any
 179     BLOCK_COMMENT("pass parameters if any");
 180     Label parameters_done;
 181     __ movl(rcx, parameter_size);  // parameter counter
 182     __ testl(rcx, rcx);
 183     __ jcc(Assembler::zero, parameters_done);
 184 
 185     // parameter passing loop
 186 
 187     Label loop;
 188     // Copy Java parameters in reverse order (receiver last)
 189     // Note that the argument order is inverted in the process
 190     // source is rdx[rcx: N-1..0]
 191     // dest   is rsp[rbx: 0..N-1]
 192 
 193     __ movptr(rdx, parameters);          // parameter pointer
 194     __ xorptr(rbx, rbx);
 195 
 196     __ BIND(loop);
 197 
 198     // get parameter
 199     __ movptr(rax, Address(rdx, rcx, Interpreter::stackElementScale(), -wordSize));
 200     __ movptr(Address(rsp, rbx, Interpreter::stackElementScale(),
 201                     Interpreter::expr_offset_in_bytes(0)), rax);          // store parameter
 202     __ increment(rbx);
 203     __ decrement(rcx);
 204     __ jcc(Assembler::notZero, loop);
 205 
 206     // call Java function
 207     __ BIND(parameters_done);
 208     __ movptr(rbx, method);           // get methodOop
 209     __ movptr(rax, entry_point);      // get entry_point
 210     __ mov(rsi, rsp);                 // set sender sp
 211     BLOCK_COMMENT("call Java function");
 212     __ call(rax);
 213 
 214     BLOCK_COMMENT("call_stub_return_address:");
 215     return_address = __ pc();
 216 
 217     Label common_return;
 218 
 219     __ BIND(common_return);
 220 
 221     // store result depending on type
 222     // (everything that is not T_LONG, T_FLOAT or T_DOUBLE is treated as T_INT)
 223     __ movptr(rdi, result);
 224     Label is_long, is_float, is_double, exit;
 225     __ movl(rsi, result_type);
 226     __ cmpl(rsi, T_LONG);
 227     __ jcc(Assembler::equal, is_long);
 228     __ cmpl(rsi, T_FLOAT);
 229     __ jcc(Assembler::equal, is_float);
 230     __ cmpl(rsi, T_DOUBLE);
 231     __ jcc(Assembler::equal, is_double);
 232 
 233     // handle T_INT case
 234     __ movl(Address(rdi, 0), rax);
 235     __ BIND(exit);
 236 
 237     // check that FPU stack is empty
 238     __ verify_FPU(0, "generate_call_stub");
 239 
 240     // pop parameters
 241     __ lea(rsp, rsp_after_call);
 242 
 243     // restore %mxcsr
 244     if (sse_save) {
 245       __ ldmxcsr(mxcsr_save);
 246     }
 247 
 248     // restore rdi, rsi and rbx,
 249     __ movptr(rbx, saved_rbx);
 250     __ movptr(rsi, saved_rsi);
 251     __ movptr(rdi, saved_rdi);
 252     __ addptr(rsp, 4*wordSize);
 253 
 254     // return
 255     __ pop(rbp);
 256     __ ret(0);
 257 
 258     // handle return types different from T_INT
 259     __ BIND(is_long);
 260     __ movl(Address(rdi, 0 * wordSize), rax);
 261     __ movl(Address(rdi, 1 * wordSize), rdx);
 262     __ jmp(exit);
 263 
 264     __ BIND(is_float);
 265     // interpreter uses xmm0 for return values
 266     if (UseSSE >= 1) {
 267       __ movflt(Address(rdi, 0), xmm0);
 268     } else {
 269       __ fstp_s(Address(rdi, 0));
 270     }
 271     __ jmp(exit);
 272 
 273     __ BIND(is_double);
 274     // interpreter uses xmm0 for return values
 275     if (UseSSE >= 2) {
 276       __ movdbl(Address(rdi, 0), xmm0);
 277     } else {
 278       __ fstp_d(Address(rdi, 0));
 279     }
 280     __ jmp(exit);
 281 
 282     // If we call compiled code directly from the call stub we will
 283     // need to adjust the return back to the call stub to a specialized
 284     // piece of code that can handle compiled results and cleaning the fpu
 285     // stack. compiled code will be set to return here instead of the
 286     // return above that handles interpreter returns.
 287 
 288     BLOCK_COMMENT("call_stub_compiled_return:");
 289     StubRoutines::x86::set_call_stub_compiled_return( __ pc());
 290 
 291 #ifdef COMPILER2
 292     if (UseSSE >= 2) {
 293       __ verify_FPU(0, "call_stub_compiled_return");
 294     } else {
 295       for (int i = 1; i < 8; i++) {
 296         __ ffree(i);
 297       }
 298 
 299       // UseSSE <= 1 so double result should be left on TOS
 300       __ movl(rsi, result_type);
 301       __ cmpl(rsi, T_DOUBLE);
 302       __ jcc(Assembler::equal, common_return);
 303       if (UseSSE == 0) {
 304         // UseSSE == 0 so float result should be left on TOS
 305         __ cmpl(rsi, T_FLOAT);
 306         __ jcc(Assembler::equal, common_return);
 307       }
 308       __ ffree(0);
 309     }
 310 #endif /* COMPILER2 */
 311     __ jmp(common_return);
 312 
 313     return start;
 314   }
 315 
 316 
 317   //------------------------------------------------------------------------------------------------------------------------
 318   // Return point for a Java call if there's an exception thrown in Java code.
 319   // The exception is caught and transformed into a pending exception stored in
 320   // JavaThread that can be tested from within the VM.
 321   //
 322   // Note: Usually the parameters are removed by the callee. In case of an exception
 323   //       crossing an activation frame boundary, that is not the case if the callee
 324   //       is compiled code => need to setup the rsp.
 325   //
 326   // rax,: exception oop
 327 
 328   address generate_catch_exception() {
 329     StubCodeMark mark(this, "StubRoutines", "catch_exception");
 330     const Address rsp_after_call(rbp, -4 * wordSize); // same as in generate_call_stub()!
 331     const Address thread        (rbp,  9 * wordSize); // same as in generate_call_stub()!
 332     address start = __ pc();
 333 
 334     // get thread directly
 335     __ movptr(rcx, thread);
 336 #ifdef ASSERT
 337     // verify that threads correspond
 338     { Label L;
 339       __ get_thread(rbx);
 340       __ cmpptr(rbx, rcx);
 341       __ jcc(Assembler::equal, L);
 342       __ stop("StubRoutines::catch_exception: threads must correspond");
 343       __ bind(L);
 344     }
 345 #endif
 346     // set pending exception
 347     __ verify_oop(rax);
 348     __ movptr(Address(rcx, Thread::pending_exception_offset()), rax          );
 349     __ lea(Address(rcx, Thread::exception_file_offset   ()),
 350            ExternalAddress((address)__FILE__));
 351     __ movl(Address(rcx, Thread::exception_line_offset   ()), __LINE__ );
 352     // complete return to VM
 353     assert(StubRoutines::_call_stub_return_address != NULL, "_call_stub_return_address must have been generated before");
 354     __ jump(RuntimeAddress(StubRoutines::_call_stub_return_address));
 355 
 356     return start;
 357   }
 358 
 359 
 360   //------------------------------------------------------------------------------------------------------------------------
 361   // Continuation point for runtime calls returning with a pending exception.
 362   // The pending exception check happened in the runtime or native call stub.
 363   // The pending exception in Thread is converted into a Java-level exception.
 364   //
 365   // Contract with Java-level exception handlers:
 366   // rax: exception
 367   // rdx: throwing pc
 368   //
 369   // NOTE: At entry of this stub, exception-pc must be on stack !!
 370 
 371   address generate_forward_exception() {
 372     StubCodeMark mark(this, "StubRoutines", "forward exception");
 373     address start = __ pc();
 374     const Register thread = rcx;
 375 
 376     // other registers used in this stub
 377     const Register exception_oop = rax;
 378     const Register handler_addr  = rbx;
 379     const Register exception_pc  = rdx;
 380 
 381     // Upon entry, the sp points to the return address returning into Java
 382     // (interpreted or compiled) code; i.e., the return address becomes the
 383     // throwing pc.
 384     //
 385     // Arguments pushed before the runtime call are still on the stack but
 386     // the exception handler will reset the stack pointer -> ignore them.
 387     // A potential result in registers can be ignored as well.
 388 
 389 #ifdef ASSERT
 390     // make sure this code is only executed if there is a pending exception
 391     { Label L;
 392       __ get_thread(thread);
 393       __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);
 394       __ jcc(Assembler::notEqual, L);
 395       __ stop("StubRoutines::forward exception: no pending exception (1)");
 396       __ bind(L);
 397     }
 398 #endif
 399 
 400     // compute exception handler into rbx,
 401     __ get_thread(thread);
 402     __ movptr(exception_pc, Address(rsp, 0));
 403     BLOCK_COMMENT("call exception_handler_for_return_address");
 404     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), thread, exception_pc);
 405     __ mov(handler_addr, rax);
 406 
 407     // setup rax & rdx, remove return address & clear pending exception
 408     __ get_thread(thread);
 409     __ pop(exception_pc);
 410     __ movptr(exception_oop, Address(thread, Thread::pending_exception_offset()));
 411     __ movptr(Address(thread, Thread::pending_exception_offset()), NULL_WORD);
 412 
 413 #ifdef ASSERT
 414     // make sure exception is set
 415     { Label L;
 416       __ testptr(exception_oop, exception_oop);
 417       __ jcc(Assembler::notEqual, L);
 418       __ stop("StubRoutines::forward exception: no pending exception (2)");
 419       __ bind(L);
 420     }
 421 #endif
 422 
 423     // Verify that there is really a valid exception in RAX.
 424     __ verify_oop(exception_oop);
 425 
 426     // Restore SP from BP if the exception PC is a MethodHandle call site.
 427     __ cmpl(Address(thread, JavaThread::is_method_handle_return_offset()), 0);
 428     __ cmovptr(Assembler::notEqual, rsp, rbp);
 429 
 430     // continue at exception handler (return address removed)
 431     // rax: exception
 432     // rbx: exception handler
 433     // rdx: throwing pc
 434     __ jmp(handler_addr);
 435 
 436     return start;
 437   }
 438 
 439 
 440   //----------------------------------------------------------------------------------------------------
 441   // Support for jint Atomic::xchg(jint exchange_value, volatile jint* dest)
 442   //
 443   // xchg exists as far back as 8086, lock needed for MP only
 444   // Stack layout immediately after call:
 445   //
 446   // 0 [ret addr ] <--- rsp
 447   // 1 [  ex     ]
 448   // 2 [  dest   ]
 449   //
 450   // Result:   *dest <- ex, return (old *dest)
 451   //
 452   // Note: win32 does not currently use this code
 453 
 454   address generate_atomic_xchg() {
 455     StubCodeMark mark(this, "StubRoutines", "atomic_xchg");
 456     address start = __ pc();
 457 
 458     __ push(rdx);
 459     Address exchange(rsp, 2 * wordSize);
 460     Address dest_addr(rsp, 3 * wordSize);
 461     __ movl(rax, exchange);
 462     __ movptr(rdx, dest_addr);
 463     __ xchgl(rax, Address(rdx, 0));
 464     __ pop(rdx);
 465     __ ret(0);
 466 
 467     return start;
 468   }
 469 
 470   //----------------------------------------------------------------------------------------------------
 471   // Support for void verify_mxcsr()
 472   //
 473   // This routine is used with -Xcheck:jni to verify that native
 474   // JNI code does not return to Java code without restoring the
 475   // MXCSR register to our expected state.
 476 
 477 
 478   address generate_verify_mxcsr() {
 479     StubCodeMark mark(this, "StubRoutines", "verify_mxcsr");
 480     address start = __ pc();
 481 
 482     const Address mxcsr_save(rsp, 0);
 483 
 484     if (CheckJNICalls && UseSSE > 0 ) {
 485       Label ok_ret;
 486       ExternalAddress mxcsr_std(StubRoutines::addr_mxcsr_std());
 487       __ push(rax);
 488       __ subptr(rsp, wordSize);      // allocate a temp location
 489       __ stmxcsr(mxcsr_save);
 490       __ movl(rax, mxcsr_save);
 491       __ andl(rax, MXCSR_MASK);
 492       __ cmp32(rax, mxcsr_std);
 493       __ jcc(Assembler::equal, ok_ret);
 494 
 495       __ warn("MXCSR changed by native JNI code.");
 496 
 497       __ ldmxcsr(mxcsr_std);
 498 
 499       __ bind(ok_ret);
 500       __ addptr(rsp, wordSize);
 501       __ pop(rax);
 502     }
 503 
 504     __ ret(0);
 505 
 506     return start;
 507   }
 508 
 509 
 510   //---------------------------------------------------------------------------
 511   // Support for void verify_fpu_cntrl_wrd()
 512   //
 513   // This routine is used with -Xcheck:jni to verify that native
 514   // JNI code does not return to Java code without restoring the
 515   // FP control word to our expected state.
 516 
 517   address generate_verify_fpu_cntrl_wrd() {
 518     StubCodeMark mark(this, "StubRoutines", "verify_spcw");
 519     address start = __ pc();
 520 
 521     const Address fpu_cntrl_wrd_save(rsp, 0);
 522 
 523     if (CheckJNICalls) {
 524       Label ok_ret;
 525       __ push(rax);
 526       __ subptr(rsp, wordSize);      // allocate a temp location
 527       __ fnstcw(fpu_cntrl_wrd_save);
 528       __ movl(rax, fpu_cntrl_wrd_save);
 529       __ andl(rax, FPU_CNTRL_WRD_MASK);
 530       ExternalAddress fpu_std(StubRoutines::addr_fpu_cntrl_wrd_std());
 531       __ cmp32(rax, fpu_std);
 532       __ jcc(Assembler::equal, ok_ret);
 533 
 534       __ warn("Floating point control word changed by native JNI code.");
 535 
 536       __ fldcw(fpu_std);
 537 
 538       __ bind(ok_ret);
 539       __ addptr(rsp, wordSize);
 540       __ pop(rax);
 541     }
 542 
 543     __ ret(0);
 544 
 545     return start;
 546   }
 547 
 548   //---------------------------------------------------------------------------
 549   // Wrapper for slow-case handling of double-to-integer conversion
 550   // d2i or f2i fast case failed either because it is nan or because
 551   // of under/overflow.
 552   // Input:  FPU TOS: float value
 553   // Output: rax, (rdx): integer (long) result
 554 
 555   address generate_d2i_wrapper(BasicType t, address fcn) {
 556     StubCodeMark mark(this, "StubRoutines", "d2i_wrapper");
 557     address start = __ pc();
 558 
 559   // Capture info about frame layout
 560   enum layout { FPUState_off         = 0,
 561                 rbp_off              = FPUStateSizeInWords,
 562                 rdi_off,
 563                 rsi_off,
 564                 rcx_off,
 565                 rbx_off,
 566                 saved_argument_off,
 567                 saved_argument_off2, // 2nd half of double
 568                 framesize
 569   };
 570 
 571   assert(FPUStateSizeInWords == 27, "update stack layout");
 572 
 573     // Save outgoing argument to stack across push_FPU_state()
 574     __ subptr(rsp, wordSize * 2);
 575     __ fstp_d(Address(rsp, 0));
 576 
 577     // Save CPU & FPU state
 578     __ push(rbx);
 579     __ push(rcx);
 580     __ push(rsi);
 581     __ push(rdi);
 582     __ push(rbp);
 583     __ push_FPU_state();
 584 
 585     // push_FPU_state() resets the FP top of stack
 586     // Load original double into FP top of stack
 587     __ fld_d(Address(rsp, saved_argument_off * wordSize));
 588     // Store double into stack as outgoing argument
 589     __ subptr(rsp, wordSize*2);
 590     __ fst_d(Address(rsp, 0));
 591 
 592     // Prepare FPU for doing math in C-land
 593     __ empty_FPU_stack();
 594     // Call the C code to massage the double.  Result in EAX
 595     if (t == T_INT)
 596       { BLOCK_COMMENT("SharedRuntime::d2i"); }
 597     else if (t == T_LONG)
 598       { BLOCK_COMMENT("SharedRuntime::d2l"); }
 599     __ call_VM_leaf( fcn, 2 );
 600 
 601     // Restore CPU & FPU state
 602     __ pop_FPU_state();
 603     __ pop(rbp);
 604     __ pop(rdi);
 605     __ pop(rsi);
 606     __ pop(rcx);
 607     __ pop(rbx);
 608     __ addptr(rsp, wordSize * 2);
 609 
 610     __ ret(0);
 611 
 612     return start;
 613   }
 614 
 615 
 616   //---------------------------------------------------------------------------
 617   // The following routine generates a subroutine to throw an asynchronous
 618   // UnknownError when an unsafe access gets a fault that could not be
 619   // reasonably prevented by the programmer.  (Example: SIGBUS/OBJERR.)
 620   address generate_handler_for_unsafe_access() {
 621     StubCodeMark mark(this, "StubRoutines", "handler_for_unsafe_access");
 622     address start = __ pc();
 623 
 624     __ push(0);                       // hole for return address-to-be
 625     __ pusha();                       // push registers
 626     Address next_pc(rsp, RegisterImpl::number_of_registers * BytesPerWord);
 627     BLOCK_COMMENT("call handle_unsafe_access");
 628     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, handle_unsafe_access)));
 629     __ movptr(next_pc, rax);          // stuff next address
 630     __ popa();
 631     __ ret(0);                        // jump to next address
 632 
 633     return start;
 634   }
 635 
 636 
 637   //----------------------------------------------------------------------------------------------------
 638   // Non-destructive plausibility checks for oops
 639 
 640   address generate_verify_oop() {
 641     StubCodeMark mark(this, "StubRoutines", "verify_oop");
 642     address start = __ pc();
 643 
 644     // Incoming arguments on stack after saving rax,:
 645     //
 646     // [tos    ]: saved rdx
 647     // [tos + 1]: saved EFLAGS
 648     // [tos + 2]: return address
 649     // [tos + 3]: char* error message
 650     // [tos + 4]: oop   object to verify
 651     // [tos + 5]: saved rax, - saved by caller
 652 
 653     Label exit, error;
 654     __ pushf();
 655     __ incrementl(ExternalAddress((address) StubRoutines::verify_oop_count_addr()));
 656     __ push(rdx);                                // save rdx
 657     // make sure object is 'reasonable'
 658     __ movptr(rax, Address(rsp, 4 * wordSize));    // get object
 659     __ testptr(rax, rax);
 660     __ jcc(Assembler::zero, exit);               // if obj is NULL it is ok
 661 
 662     // Check if the oop is in the right area of memory
 663     const int oop_mask = Universe::verify_oop_mask();
 664     const int oop_bits = Universe::verify_oop_bits();
 665     __ mov(rdx, rax);
 666     __ andptr(rdx, oop_mask);
 667     __ cmpptr(rdx, oop_bits);
 668     __ jcc(Assembler::notZero, error);
 669 
 670     // make sure klass is 'reasonable'
 671     __ movptr(rax, Address(rax, oopDesc::klass_offset_in_bytes())); // get klass
 672     __ testptr(rax, rax);
 673     __ jcc(Assembler::zero, error);              // if klass is NULL it is broken
 674 
 675     // Check if the klass is in the right area of memory
 676     const int klass_mask = Universe::verify_klass_mask();
 677     const int klass_bits = Universe::verify_klass_bits();
 678     __ mov(rdx, rax);
 679     __ andptr(rdx, klass_mask);
 680     __ cmpptr(rdx, klass_bits);
 681     __ jcc(Assembler::notZero, error);
 682 
 683     // make sure klass' klass is 'reasonable'
 684     __ movptr(rax, Address(rax, oopDesc::klass_offset_in_bytes())); // get klass' klass
 685     __ testptr(rax, rax);
 686     __ jcc(Assembler::zero, error);              // if klass' klass is NULL it is broken
 687 
 688     __ mov(rdx, rax);
 689     __ andptr(rdx, klass_mask);
 690     __ cmpptr(rdx, klass_bits);
 691     __ jcc(Assembler::notZero, error);           // if klass not in right area
 692                                                  // of memory it is broken too.
 693 
 694     // return if everything seems ok
 695     __ bind(exit);
 696     __ movptr(rax, Address(rsp, 5 * wordSize));  // get saved rax, back
 697     __ pop(rdx);                                 // restore rdx
 698     __ popf();                                   // restore EFLAGS
 699     __ ret(2 * wordSize);                        // pop arguments
 700 
 701     // handle errors
 702     __ bind(error);
 703     __ movptr(rax, Address(rsp, 5 * wordSize));  // get saved rax, back
 704     __ pop(rdx);                                 // get saved rdx back
 705     __ popf();                                   // get saved EFLAGS off stack -- will be ignored
 706     __ pusha();                                  // push registers (eip = return address & msg are already pushed)
 707     BLOCK_COMMENT("call MacroAssembler::debug");
 708     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, MacroAssembler::debug32)));
 709     __ popa();
 710     __ ret(2 * wordSize);                        // pop arguments
 711     return start;
 712   }
 713 
 714   //
 715   //  Generate pre-barrier for array stores
 716   //
 717   //  Input:
 718   //     start   -  starting address
 719   //     count   -  element count
 720   void  gen_write_ref_array_pre_barrier(Register start, Register count) {
 721     assert_different_registers(start, count);
 722     BarrierSet* bs = Universe::heap()->barrier_set();
 723     switch (bs->kind()) {
 724       case BarrierSet::G1SATBCT:
 725       case BarrierSet::G1SATBCTLogging:
 726         {
 727           __ pusha();                      // push registers
 728           __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_pre),
 729                           start, count);
 730           __ popa();
 731         }
 732         break;
 733       case BarrierSet::CardTableModRef:
 734       case BarrierSet::CardTableExtension:
 735       case BarrierSet::ModRef:
 736         break;
 737       default      :
 738         ShouldNotReachHere();
 739 
 740     }
 741   }
 742 
 743 
 744   //
 745   // Generate a post-barrier for an array store
 746   //
 747   //     start    -  starting address
 748   //     count    -  element count
 749   //
 750   //  The two input registers are overwritten.
 751   //
 752   void  gen_write_ref_array_post_barrier(Register start, Register count) {
 753     BarrierSet* bs = Universe::heap()->barrier_set();
 754     assert_different_registers(start, count);
 755     switch (bs->kind()) {
 756       case BarrierSet::G1SATBCT:
 757       case BarrierSet::G1SATBCTLogging:
 758         {
 759           __ pusha();                      // push registers
 760           __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_post),
 761                           start, count);
 762           __ popa();
 763         }
 764         break;
 765 
 766       case BarrierSet::CardTableModRef:
 767       case BarrierSet::CardTableExtension:
 768         {
 769           CardTableModRefBS* ct = (CardTableModRefBS*)bs;
 770           assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code");
 771 
 772           Label L_loop;
 773           const Register end = count;  // elements count; end == start+count-1
 774           assert_different_registers(start, end);
 775 
 776           __ lea(end,  Address(start, count, Address::times_ptr, -wordSize));
 777           __ shrptr(start, CardTableModRefBS::card_shift);
 778           __ shrptr(end,   CardTableModRefBS::card_shift);
 779           __ subptr(end, start); // end --> count
 780         __ BIND(L_loop);
 781           intptr_t disp = (intptr_t) ct->byte_map_base;
 782           Address cardtable(start, count, Address::times_1, disp);
 783           __ movb(cardtable, 0);
 784           __ decrement(count);
 785           __ jcc(Assembler::greaterEqual, L_loop);
 786         }
 787         break;
 788       case BarrierSet::ModRef:
 789         break;
 790       default      :
 791         ShouldNotReachHere();
 792 
 793     }
 794   }
 795 
 796 
 797   // Copy 64 bytes chunks
 798   //
 799   // Inputs:
 800   //   from        - source array address
 801   //   to_from     - destination array address - from
 802   //   qword_count - 8-bytes element count, negative
 803   //
 804   void xmm_copy_forward(Register from, Register to_from, Register qword_count) {
 805     assert( UseSSE >= 2, "supported cpu only" );
 806     Label L_copy_64_bytes_loop, L_copy_64_bytes, L_copy_8_bytes, L_exit;
 807     // Copy 64-byte chunks
 808     __ jmpb(L_copy_64_bytes);
 809     __ align(OptoLoopAlignment);
 810   __ BIND(L_copy_64_bytes_loop);
 811 
 812     if(UseUnalignedLoadStores) {
 813       __ movdqu(xmm0, Address(from, 0));
 814       __ movdqu(Address(from, to_from, Address::times_1, 0), xmm0);
 815       __ movdqu(xmm1, Address(from, 16));
 816       __ movdqu(Address(from, to_from, Address::times_1, 16), xmm1);
 817       __ movdqu(xmm2, Address(from, 32));
 818       __ movdqu(Address(from, to_from, Address::times_1, 32), xmm2);
 819       __ movdqu(xmm3, Address(from, 48));
 820       __ movdqu(Address(from, to_from, Address::times_1, 48), xmm3);
 821 
 822     } else {
 823       __ movq(xmm0, Address(from, 0));
 824       __ movq(Address(from, to_from, Address::times_1, 0), xmm0);
 825       __ movq(xmm1, Address(from, 8));
 826       __ movq(Address(from, to_from, Address::times_1, 8), xmm1);
 827       __ movq(xmm2, Address(from, 16));
 828       __ movq(Address(from, to_from, Address::times_1, 16), xmm2);
 829       __ movq(xmm3, Address(from, 24));
 830       __ movq(Address(from, to_from, Address::times_1, 24), xmm3);
 831       __ movq(xmm4, Address(from, 32));
 832       __ movq(Address(from, to_from, Address::times_1, 32), xmm4);
 833       __ movq(xmm5, Address(from, 40));
 834       __ movq(Address(from, to_from, Address::times_1, 40), xmm5);
 835       __ movq(xmm6, Address(from, 48));
 836       __ movq(Address(from, to_from, Address::times_1, 48), xmm6);
 837       __ movq(xmm7, Address(from, 56));
 838       __ movq(Address(from, to_from, Address::times_1, 56), xmm7);
 839     }
 840 
 841     __ addl(from, 64);
 842   __ BIND(L_copy_64_bytes);
 843     __ subl(qword_count, 8);
 844     __ jcc(Assembler::greaterEqual, L_copy_64_bytes_loop);
 845     __ addl(qword_count, 8);
 846     __ jccb(Assembler::zero, L_exit);
 847     //
 848     // length is too short, just copy qwords
 849     //
 850   __ BIND(L_copy_8_bytes);
 851     __ movq(xmm0, Address(from, 0));
 852     __ movq(Address(from, to_from, Address::times_1), xmm0);
 853     __ addl(from, 8);
 854     __ decrement(qword_count);
 855     __ jcc(Assembler::greater, L_copy_8_bytes);
 856   __ BIND(L_exit);
 857   }
 858 
 859   // Copy 64 bytes chunks
 860   //
 861   // Inputs:
 862   //   from        - source array address
 863   //   to_from     - destination array address - from
 864   //   qword_count - 8-bytes element count, negative
 865   //
 866   void mmx_copy_forward(Register from, Register to_from, Register qword_count) {
 867     assert( VM_Version::supports_mmx(), "supported cpu only" );
 868     Label L_copy_64_bytes_loop, L_copy_64_bytes, L_copy_8_bytes, L_exit;
 869     // Copy 64-byte chunks
 870     __ jmpb(L_copy_64_bytes);
 871     __ align(OptoLoopAlignment);
 872   __ BIND(L_copy_64_bytes_loop);
 873     __ movq(mmx0, Address(from, 0));
 874     __ movq(mmx1, Address(from, 8));
 875     __ movq(mmx2, Address(from, 16));
 876     __ movq(Address(from, to_from, Address::times_1, 0), mmx0);
 877     __ movq(mmx3, Address(from, 24));
 878     __ movq(Address(from, to_from, Address::times_1, 8), mmx1);
 879     __ movq(mmx4, Address(from, 32));
 880     __ movq(Address(from, to_from, Address::times_1, 16), mmx2);
 881     __ movq(mmx5, Address(from, 40));
 882     __ movq(Address(from, to_from, Address::times_1, 24), mmx3);
 883     __ movq(mmx6, Address(from, 48));
 884     __ movq(Address(from, to_from, Address::times_1, 32), mmx4);
 885     __ movq(mmx7, Address(from, 56));
 886     __ movq(Address(from, to_from, Address::times_1, 40), mmx5);
 887     __ movq(Address(from, to_from, Address::times_1, 48), mmx6);
 888     __ movq(Address(from, to_from, Address::times_1, 56), mmx7);
 889     __ addptr(from, 64);
 890   __ BIND(L_copy_64_bytes);
 891     __ subl(qword_count, 8);
 892     __ jcc(Assembler::greaterEqual, L_copy_64_bytes_loop);
 893     __ addl(qword_count, 8);
 894     __ jccb(Assembler::zero, L_exit);
 895     //
 896     // length is too short, just copy qwords
 897     //
 898   __ BIND(L_copy_8_bytes);
 899     __ movq(mmx0, Address(from, 0));
 900     __ movq(Address(from, to_from, Address::times_1), mmx0);
 901     __ addptr(from, 8);
 902     __ decrement(qword_count);
 903     __ jcc(Assembler::greater, L_copy_8_bytes);
 904   __ BIND(L_exit);
 905     __ emms();
 906   }
 907 
 908   address generate_disjoint_copy(BasicType t, bool aligned,
 909                                  Address::ScaleFactor sf,
 910                                  address* entry, const char *name) {
 911     __ align(CodeEntryAlignment);
 912     StubCodeMark mark(this, "StubRoutines", name);
 913     address start = __ pc();
 914 
 915     Label L_0_count, L_exit, L_skip_align1, L_skip_align2, L_copy_byte;
 916     Label L_copy_2_bytes, L_copy_4_bytes, L_copy_64_bytes;
 917 
 918     int shift = Address::times_ptr - sf;
 919 
 920     const Register from     = rsi;  // source array address
 921     const Register to       = rdi;  // destination array address
 922     const Register count    = rcx;  // elements count
 923     const Register to_from  = to;   // (to - from)
 924     const Register saved_to = rdx;  // saved destination array address
 925 
 926     __ enter(); // required for proper stackwalking of RuntimeStub frame
 927     __ push(rsi);
 928     __ push(rdi);
 929     __ movptr(from , Address(rsp, 12+ 4));
 930     __ movptr(to   , Address(rsp, 12+ 8));
 931     __ movl(count, Address(rsp, 12+ 12));
 932     if (t == T_OBJECT) {
 933       __ testl(count, count);
 934       __ jcc(Assembler::zero, L_0_count);
 935       gen_write_ref_array_pre_barrier(to, count);
 936       __ mov(saved_to, to);          // save 'to'
 937     }
 938 
 939     *entry = __ pc(); // Entry point from conjoint arraycopy stub.
 940     BLOCK_COMMENT("Entry:");
 941 
 942     __ subptr(to, from); // to --> to_from
 943     __ cmpl(count, 2<<shift); // Short arrays (< 8 bytes) copy by element
 944     __ jcc(Assembler::below, L_copy_4_bytes); // use unsigned cmp
 945     if (!UseUnalignedLoadStores && !aligned && (t == T_BYTE || t == T_SHORT)) {
 946       // align source address at 4 bytes address boundary
 947       if (t == T_BYTE) {
 948         // One byte misalignment happens only for byte arrays
 949         __ testl(from, 1);
 950         __ jccb(Assembler::zero, L_skip_align1);
 951         __ movb(rax, Address(from, 0));
 952         __ movb(Address(from, to_from, Address::times_1, 0), rax);
 953         __ increment(from);
 954         __ decrement(count);
 955       __ BIND(L_skip_align1);
 956       }
 957       // Two bytes misalignment happens only for byte and short (char) arrays
 958       __ testl(from, 2);
 959       __ jccb(Assembler::zero, L_skip_align2);
 960       __ movw(rax, Address(from, 0));
 961       __ movw(Address(from, to_from, Address::times_1, 0), rax);
 962       __ addptr(from, 2);
 963       __ subl(count, 1<<(shift-1));
 964     __ BIND(L_skip_align2);
 965     }
 966     if (!VM_Version::supports_mmx()) {
 967       __ mov(rax, count);      // save 'count'
 968       __ shrl(count, shift); // bytes count
 969       __ addptr(to_from, from);// restore 'to'
 970       __ rep_mov();
 971       __ subptr(to_from, from);// restore 'to_from'
 972       __ mov(count, rax);      // restore 'count'
 973       __ jmpb(L_copy_2_bytes); // all dwords were copied
 974     } else {
 975       if (!UseUnalignedLoadStores) {
 976         // align to 8 bytes, we know we are 4 byte aligned to start
 977         __ testptr(from, 4);
 978         __ jccb(Assembler::zero, L_copy_64_bytes);
 979         __ movl(rax, Address(from, 0));
 980         __ movl(Address(from, to_from, Address::times_1, 0), rax);
 981         __ addptr(from, 4);
 982         __ subl(count, 1<<shift);
 983       }
 984     __ BIND(L_copy_64_bytes);
 985       __ mov(rax, count);
 986       __ shrl(rax, shift+1);  // 8 bytes chunk count
 987       //
 988       // Copy 8-byte chunks through MMX registers, 8 per iteration of the loop
 989       //
 990       if (UseXMMForArrayCopy) {
 991         xmm_copy_forward(from, to_from, rax);
 992       } else {
 993         mmx_copy_forward(from, to_from, rax);
 994       }
 995     }
 996     // copy tailing dword
 997   __ BIND(L_copy_4_bytes);
 998     __ testl(count, 1<<shift);
 999     __ jccb(Assembler::zero, L_copy_2_bytes);
1000     __ movl(rax, Address(from, 0));
1001     __ movl(Address(from, to_from, Address::times_1, 0), rax);
1002     if (t == T_BYTE || t == T_SHORT) {
1003       __ addptr(from, 4);
1004     __ BIND(L_copy_2_bytes);
1005       // copy tailing word
1006       __ testl(count, 1<<(shift-1));
1007       __ jccb(Assembler::zero, L_copy_byte);
1008       __ movw(rax, Address(from, 0));
1009       __ movw(Address(from, to_from, Address::times_1, 0), rax);
1010       if (t == T_BYTE) {
1011         __ addptr(from, 2);
1012       __ BIND(L_copy_byte);
1013         // copy tailing byte
1014         __ testl(count, 1);
1015         __ jccb(Assembler::zero, L_exit);
1016         __ movb(rax, Address(from, 0));
1017         __ movb(Address(from, to_from, Address::times_1, 0), rax);
1018       __ BIND(L_exit);
1019       } else {
1020       __ BIND(L_copy_byte);
1021       }
1022     } else {
1023     __ BIND(L_copy_2_bytes);
1024     }
1025 
1026     if (t == T_OBJECT) {
1027       __ movl(count, Address(rsp, 12+12)); // reread 'count'
1028       __ mov(to, saved_to); // restore 'to'
1029       gen_write_ref_array_post_barrier(to, count);
1030     __ BIND(L_0_count);
1031     }
1032     inc_copy_counter_np(t);
1033     __ pop(rdi);
1034     __ pop(rsi);
1035     __ leave(); // required for proper stackwalking of RuntimeStub frame
1036     __ xorptr(rax, rax); // return 0
1037     __ ret(0);
1038     return start;
1039   }
1040 
1041 
1042   address generate_conjoint_copy(BasicType t, bool aligned,
1043                                  Address::ScaleFactor sf,
1044                                  address nooverlap_target,
1045                                  address* entry, const char *name) {
1046     __ align(CodeEntryAlignment);
1047     StubCodeMark mark(this, "StubRoutines", name);
1048     address start = __ pc();
1049 
1050     Label L_0_count, L_exit, L_skip_align1, L_skip_align2, L_copy_byte;
1051     Label L_copy_2_bytes, L_copy_4_bytes, L_copy_8_bytes, L_copy_8_bytes_loop;
1052 
1053     int shift = Address::times_ptr - sf;
1054 
1055     const Register src   = rax;  // source array address
1056     const Register dst   = rdx;  // destination array address
1057     const Register from  = rsi;  // source array address
1058     const Register to    = rdi;  // destination array address
1059     const Register count = rcx;  // elements count
1060     const Register end   = rax;  // array end address
1061 
1062     __ enter(); // required for proper stackwalking of RuntimeStub frame
1063     __ push(rsi);
1064     __ push(rdi);
1065     __ movptr(src  , Address(rsp, 12+ 4));   // from
1066     __ movptr(dst  , Address(rsp, 12+ 8));   // to
1067     __ movl2ptr(count, Address(rsp, 12+12)); // count
1068     if (t == T_OBJECT) {
1069        gen_write_ref_array_pre_barrier(dst, count);
1070     }
1071 
1072     if (entry != NULL) {
1073       *entry = __ pc(); // Entry point from generic arraycopy stub.
1074       BLOCK_COMMENT("Entry:");
1075     }
1076 
1077     if (t == T_OBJECT) {
1078       __ testl(count, count);
1079       __ jcc(Assembler::zero, L_0_count);
1080     }
1081     __ mov(from, src);
1082     __ mov(to  , dst);
1083 
1084     // arrays overlap test
1085     RuntimeAddress nooverlap(nooverlap_target);
1086     __ cmpptr(dst, src);
1087     __ lea(end, Address(src, count, sf, 0)); // src + count * elem_size
1088     __ jump_cc(Assembler::belowEqual, nooverlap);
1089     __ cmpptr(dst, end);
1090     __ jump_cc(Assembler::aboveEqual, nooverlap);
1091 
1092     // copy from high to low
1093     __ cmpl(count, 2<<shift); // Short arrays (< 8 bytes) copy by element
1094     __ jcc(Assembler::below, L_copy_4_bytes); // use unsigned cmp
1095     if (t == T_BYTE || t == T_SHORT) {
1096       // Align the end of destination array at 4 bytes address boundary
1097       __ lea(end, Address(dst, count, sf, 0));
1098       if (t == T_BYTE) {
1099         // One byte misalignment happens only for byte arrays
1100         __ testl(end, 1);
1101         __ jccb(Assembler::zero, L_skip_align1);
1102         __ decrement(count);
1103         __ movb(rdx, Address(from, count, sf, 0));
1104         __ movb(Address(to, count, sf, 0), rdx);
1105       __ BIND(L_skip_align1);
1106       }
1107       // Two bytes misalignment happens only for byte and short (char) arrays
1108       __ testl(end, 2);
1109       __ jccb(Assembler::zero, L_skip_align2);
1110       __ subptr(count, 1<<(shift-1));
1111       __ movw(rdx, Address(from, count, sf, 0));
1112       __ movw(Address(to, count, sf, 0), rdx);
1113     __ BIND(L_skip_align2);
1114       __ cmpl(count, 2<<shift); // Short arrays (< 8 bytes) copy by element
1115       __ jcc(Assembler::below, L_copy_4_bytes);
1116     }
1117 
1118     if (!VM_Version::supports_mmx()) {
1119       __ std();
1120       __ mov(rax, count); // Save 'count'
1121       __ mov(rdx, to);    // Save 'to'
1122       __ lea(rsi, Address(from, count, sf, -4));
1123       __ lea(rdi, Address(to  , count, sf, -4));
1124       __ shrptr(count, shift); // bytes count
1125       __ rep_mov();
1126       __ cld();
1127       __ mov(count, rax); // restore 'count'
1128       __ andl(count, (1<<shift)-1);      // mask the number of rest elements
1129       __ movptr(from, Address(rsp, 12+4)); // reread 'from'
1130       __ mov(to, rdx);   // restore 'to'
1131       __ jmpb(L_copy_2_bytes); // all dword were copied
1132    } else {
1133       // Align to 8 bytes the end of array. It is aligned to 4 bytes already.
1134       __ testptr(end, 4);
1135       __ jccb(Assembler::zero, L_copy_8_bytes);
1136       __ subl(count, 1<<shift);
1137       __ movl(rdx, Address(from, count, sf, 0));
1138       __ movl(Address(to, count, sf, 0), rdx);
1139       __ jmpb(L_copy_8_bytes);
1140 
1141       __ align(OptoLoopAlignment);
1142       // Move 8 bytes
1143     __ BIND(L_copy_8_bytes_loop);
1144       if (UseXMMForArrayCopy) {
1145         __ movq(xmm0, Address(from, count, sf, 0));
1146         __ movq(Address(to, count, sf, 0), xmm0);
1147       } else {
1148         __ movq(mmx0, Address(from, count, sf, 0));
1149         __ movq(Address(to, count, sf, 0), mmx0);
1150       }
1151     __ BIND(L_copy_8_bytes);
1152       __ subl(count, 2<<shift);
1153       __ jcc(Assembler::greaterEqual, L_copy_8_bytes_loop);
1154       __ addl(count, 2<<shift);
1155       if (!UseXMMForArrayCopy) {
1156         __ emms();
1157       }
1158     }
1159   __ BIND(L_copy_4_bytes);
1160     // copy prefix qword
1161     __ testl(count, 1<<shift);
1162     __ jccb(Assembler::zero, L_copy_2_bytes);
1163     __ movl(rdx, Address(from, count, sf, -4));
1164     __ movl(Address(to, count, sf, -4), rdx);
1165 
1166     if (t == T_BYTE || t == T_SHORT) {
1167         __ subl(count, (1<<shift));
1168       __ BIND(L_copy_2_bytes);
1169         // copy prefix dword
1170         __ testl(count, 1<<(shift-1));
1171         __ jccb(Assembler::zero, L_copy_byte);
1172         __ movw(rdx, Address(from, count, sf, -2));
1173         __ movw(Address(to, count, sf, -2), rdx);
1174         if (t == T_BYTE) {
1175           __ subl(count, 1<<(shift-1));
1176         __ BIND(L_copy_byte);
1177           // copy prefix byte
1178           __ testl(count, 1);
1179           __ jccb(Assembler::zero, L_exit);
1180           __ movb(rdx, Address(from, 0));
1181           __ movb(Address(to, 0), rdx);
1182         __ BIND(L_exit);
1183         } else {
1184         __ BIND(L_copy_byte);
1185         }
1186     } else {
1187     __ BIND(L_copy_2_bytes);
1188     }
1189     if (t == T_OBJECT) {
1190       __ movl2ptr(count, Address(rsp, 12+12)); // reread count
1191       gen_write_ref_array_post_barrier(to, count);
1192     __ BIND(L_0_count);
1193     }
1194     inc_copy_counter_np(t);
1195     __ pop(rdi);
1196     __ pop(rsi);
1197     __ leave(); // required for proper stackwalking of RuntimeStub frame
1198     __ xorptr(rax, rax); // return 0
1199     __ ret(0);
1200     return start;
1201   }
1202 
1203 
1204   address generate_disjoint_long_copy(address* entry, const char *name) {
1205     __ align(CodeEntryAlignment);
1206     StubCodeMark mark(this, "StubRoutines", name);
1207     address start = __ pc();
1208 
1209     Label L_copy_8_bytes, L_copy_8_bytes_loop;
1210     const Register from       = rax;  // source array address
1211     const Register to         = rdx;  // destination array address
1212     const Register count      = rcx;  // elements count
1213     const Register to_from    = rdx;  // (to - from)
1214 
1215     __ enter(); // required for proper stackwalking of RuntimeStub frame
1216     __ movptr(from , Address(rsp, 8+0));       // from
1217     __ movptr(to   , Address(rsp, 8+4));       // to
1218     __ movl2ptr(count, Address(rsp, 8+8));     // count
1219 
1220     *entry = __ pc(); // Entry point from conjoint arraycopy stub.
1221     BLOCK_COMMENT("Entry:");
1222 
1223     __ subptr(to, from); // to --> to_from
1224     if (VM_Version::supports_mmx()) {
1225       if (UseXMMForArrayCopy) {
1226         xmm_copy_forward(from, to_from, count);
1227       } else {
1228         mmx_copy_forward(from, to_from, count);
1229       }
1230     } else {
1231       __ jmpb(L_copy_8_bytes);
1232       __ align(OptoLoopAlignment);
1233     __ BIND(L_copy_8_bytes_loop);
1234       __ fild_d(Address(from, 0));
1235       __ fistp_d(Address(from, to_from, Address::times_1));
1236       __ addptr(from, 8);
1237     __ BIND(L_copy_8_bytes);
1238       __ decrement(count);
1239       __ jcc(Assembler::greaterEqual, L_copy_8_bytes_loop);
1240     }
1241     inc_copy_counter_np(T_LONG);
1242     __ leave(); // required for proper stackwalking of RuntimeStub frame
1243     __ xorptr(rax, rax); // return 0
1244     __ ret(0);
1245     return start;
1246   }
1247 
1248   address generate_conjoint_long_copy(address nooverlap_target,
1249                                       address* entry, const char *name) {
1250     __ align(CodeEntryAlignment);
1251     StubCodeMark mark(this, "StubRoutines", name);
1252     address start = __ pc();
1253 
1254     Label L_copy_8_bytes, L_copy_8_bytes_loop;
1255     const Register from       = rax;  // source array address
1256     const Register to         = rdx;  // destination array address
1257     const Register count      = rcx;  // elements count
1258     const Register end_from   = rax;  // source array end address
1259 
1260     __ enter(); // required for proper stackwalking of RuntimeStub frame
1261     __ movptr(from , Address(rsp, 8+0));       // from
1262     __ movptr(to   , Address(rsp, 8+4));       // to
1263     __ movl2ptr(count, Address(rsp, 8+8));     // count
1264 
1265     *entry = __ pc(); // Entry point from generic arraycopy stub.
1266     BLOCK_COMMENT("Entry:");
1267 
1268     // arrays overlap test
1269     __ cmpptr(to, from);
1270     RuntimeAddress nooverlap(nooverlap_target);
1271     __ jump_cc(Assembler::belowEqual, nooverlap);
1272     __ lea(end_from, Address(from, count, Address::times_8, 0));
1273     __ cmpptr(to, end_from);
1274     __ movptr(from, Address(rsp, 8));  // from
1275     __ jump_cc(Assembler::aboveEqual, nooverlap);
1276 
1277     __ jmpb(L_copy_8_bytes);
1278 
1279     __ align(OptoLoopAlignment);
1280   __ BIND(L_copy_8_bytes_loop);
1281     if (VM_Version::supports_mmx()) {
1282       if (UseXMMForArrayCopy) {
1283         __ movq(xmm0, Address(from, count, Address::times_8));
1284         __ movq(Address(to, count, Address::times_8), xmm0);
1285       } else {
1286         __ movq(mmx0, Address(from, count, Address::times_8));
1287         __ movq(Address(to, count, Address::times_8), mmx0);
1288       }
1289     } else {
1290       __ fild_d(Address(from, count, Address::times_8));
1291       __ fistp_d(Address(to, count, Address::times_8));
1292     }
1293   __ BIND(L_copy_8_bytes);
1294     __ decrement(count);
1295     __ jcc(Assembler::greaterEqual, L_copy_8_bytes_loop);
1296 
1297     if (VM_Version::supports_mmx() && !UseXMMForArrayCopy) {
1298       __ emms();
1299     }
1300     inc_copy_counter_np(T_LONG);
1301     __ leave(); // required for proper stackwalking of RuntimeStub frame
1302     __ xorptr(rax, rax); // return 0
1303     __ ret(0);
1304     return start;
1305   }
1306 
1307 
1308   // Helper for generating a dynamic type check.
1309   // The sub_klass must be one of {rbx, rdx, rsi}.
1310   // The temp is killed.
1311   void generate_type_check(Register sub_klass,
1312                            Address& super_check_offset_addr,
1313                            Address& super_klass_addr,
1314                            Register temp,
1315                            Label* L_success, Label* L_failure) {
1316     BLOCK_COMMENT("type_check:");
1317 
1318     Label L_fallthrough;
1319 #define LOCAL_JCC(assembler_con, label_ptr)                             \
1320     if (label_ptr != NULL)  __ jcc(assembler_con, *(label_ptr));        \
1321     else                    __ jcc(assembler_con, L_fallthrough) /*omit semi*/
1322 
1323     // The following is a strange variation of the fast path which requires
1324     // one less register, because needed values are on the argument stack.
1325     // __ check_klass_subtype_fast_path(sub_klass, *super_klass*, temp,
1326     //                                  L_success, L_failure, NULL);
1327     assert_different_registers(sub_klass, temp);
1328 
1329     int sc_offset = (klassOopDesc::header_size() * HeapWordSize +
1330                      Klass::secondary_super_cache_offset_in_bytes());
1331 
1332     // if the pointers are equal, we are done (e.g., String[] elements)
1333     __ cmpptr(sub_klass, super_klass_addr);
1334     LOCAL_JCC(Assembler::equal, L_success);
1335 
1336     // check the supertype display:
1337     __ movl2ptr(temp, super_check_offset_addr);
1338     Address super_check_addr(sub_klass, temp, Address::times_1, 0);
1339     __ movptr(temp, super_check_addr); // load displayed supertype
1340     __ cmpptr(temp, super_klass_addr); // test the super type
1341     LOCAL_JCC(Assembler::equal, L_success);
1342 
1343     // if it was a primary super, we can just fail immediately
1344     __ cmpl(super_check_offset_addr, sc_offset);
1345     LOCAL_JCC(Assembler::notEqual, L_failure);
1346 
1347     // The repne_scan instruction uses fixed registers, which will get spilled.
1348     // We happen to know this works best when super_klass is in rax.
1349     Register super_klass = temp;
1350     __ movptr(super_klass, super_klass_addr);
1351     __ check_klass_subtype_slow_path(sub_klass, super_klass, noreg, noreg,
1352                                      L_success, L_failure);
1353 
1354     __ bind(L_fallthrough);
1355 
1356     if (L_success == NULL) { BLOCK_COMMENT("L_success:"); }
1357     if (L_failure == NULL) { BLOCK_COMMENT("L_failure:"); }
1358 
1359 #undef LOCAL_JCC
1360   }
1361 
1362   //
1363   //  Generate checkcasting array copy stub
1364   //
1365   //  Input:
1366   //    4(rsp)   - source array address
1367   //    8(rsp)   - destination array address
1368   //   12(rsp)   - element count, can be zero
1369   //   16(rsp)   - size_t ckoff (super_check_offset)
1370   //   20(rsp)   - oop ckval (super_klass)
1371   //
1372   //  Output:
1373   //    rax, ==  0  -  success
1374   //    rax, == -1^K - failure, where K is partial transfer count
1375   //
1376   address generate_checkcast_copy(const char *name, address* entry) {
1377     __ align(CodeEntryAlignment);
1378     StubCodeMark mark(this, "StubRoutines", name);
1379     address start = __ pc();
1380 
1381     Label L_load_element, L_store_element, L_do_card_marks, L_done;
1382 
1383     // register use:
1384     //  rax, rdx, rcx -- loop control (end_from, end_to, count)
1385     //  rdi, rsi      -- element access (oop, klass)
1386     //  rbx,           -- temp
1387     const Register from       = rax;    // source array address
1388     const Register to         = rdx;    // destination array address
1389     const Register length     = rcx;    // elements count
1390     const Register elem       = rdi;    // each oop copied
1391     const Register elem_klass = rsi;    // each elem._klass (sub_klass)
1392     const Register temp       = rbx;    // lone remaining temp
1393 
1394     __ enter(); // required for proper stackwalking of RuntimeStub frame
1395 
1396     __ push(rsi);
1397     __ push(rdi);
1398     __ push(rbx);
1399 
1400     Address   from_arg(rsp, 16+ 4);     // from
1401     Address     to_arg(rsp, 16+ 8);     // to
1402     Address length_arg(rsp, 16+12);     // elements count
1403     Address  ckoff_arg(rsp, 16+16);     // super_check_offset
1404     Address  ckval_arg(rsp, 16+20);     // super_klass
1405 
1406     // Load up:
1407     __ movptr(from,     from_arg);
1408     __ movptr(to,         to_arg);
1409     __ movl2ptr(length, length_arg);
1410 
1411     *entry = __ pc(); // Entry point from generic arraycopy stub.
1412     BLOCK_COMMENT("Entry:");
1413 
1414     //---------------------------------------------------------------
1415     // Assembler stub will be used for this call to arraycopy
1416     // if the two arrays are subtypes of Object[] but the
1417     // destination array type is not equal to or a supertype
1418     // of the source type.  Each element must be separately
1419     // checked.
1420 
1421     // Loop-invariant addresses.  They are exclusive end pointers.
1422     Address end_from_addr(from, length, Address::times_ptr, 0);
1423     Address   end_to_addr(to,   length, Address::times_ptr, 0);
1424 
1425     Register end_from = from;           // re-use
1426     Register end_to   = to;             // re-use
1427     Register count    = length;         // re-use
1428 
1429     // Loop-variant addresses.  They assume post-incremented count < 0.
1430     Address from_element_addr(end_from, count, Address::times_ptr, 0);
1431     Address   to_element_addr(end_to,   count, Address::times_ptr, 0);
1432     Address elem_klass_addr(elem, oopDesc::klass_offset_in_bytes());
1433 
1434     // Copy from low to high addresses, indexed from the end of each array.
1435     gen_write_ref_array_pre_barrier(to, count);
1436     __ lea(end_from, end_from_addr);
1437     __ lea(end_to,   end_to_addr);
1438     assert(length == count, "");        // else fix next line:
1439     __ negptr(count);                   // negate and test the length
1440     __ jccb(Assembler::notZero, L_load_element);
1441 
1442     // Empty array:  Nothing to do.
1443     __ xorptr(rax, rax);                  // return 0 on (trivial) success
1444     __ jmp(L_done);
1445 
1446     // ======== begin loop ========
1447     // (Loop is rotated; its entry is L_load_element.)
1448     // Loop control:
1449     //   for (count = -count; count != 0; count++)
1450     // Base pointers src, dst are biased by 8*count,to last element.
1451     __ align(OptoLoopAlignment);
1452 
1453     __ BIND(L_store_element);
1454     __ movptr(to_element_addr, elem);     // store the oop
1455     __ increment(count);                // increment the count toward zero
1456     __ jccb(Assembler::zero, L_do_card_marks);
1457 
1458     // ======== loop entry is here ========
1459     __ BIND(L_load_element);
1460     __ movptr(elem, from_element_addr);   // load the oop
1461     __ testptr(elem, elem);
1462     __ jccb(Assembler::zero, L_store_element);
1463 
1464     // (Could do a trick here:  Remember last successful non-null
1465     // element stored and make a quick oop equality check on it.)
1466 
1467     __ movptr(elem_klass, elem_klass_addr); // query the object klass
1468     generate_type_check(elem_klass, ckoff_arg, ckval_arg, temp,
1469                         &L_store_element, NULL);
1470       // (On fall-through, we have failed the element type check.)
1471     // ======== end loop ========
1472 
1473     // It was a real error; we must depend on the caller to finish the job.
1474     // Register "count" = -1 * number of *remaining* oops, length_arg = *total* oops.
1475     // Emit GC store barriers for the oops we have copied (length_arg + count),
1476     // and report their number to the caller.
1477     __ addl(count, length_arg);         // transfers = (length - remaining)
1478     __ movl2ptr(rax, count);            // save the value
1479     __ notptr(rax);                     // report (-1^K) to caller
1480     __ movptr(to, to_arg);              // reload
1481     assert_different_registers(to, count, rax);
1482     gen_write_ref_array_post_barrier(to, count);
1483     __ jmpb(L_done);
1484 
1485     // Come here on success only.
1486     __ BIND(L_do_card_marks);
1487     __ movl2ptr(count, length_arg);
1488     __ movptr(to, to_arg);                // reload
1489     gen_write_ref_array_post_barrier(to, count);
1490     __ xorptr(rax, rax);                  // return 0 on success
1491 
1492     // Common exit point (success or failure).
1493     __ BIND(L_done);
1494     __ pop(rbx);
1495     __ pop(rdi);
1496     __ pop(rsi);
1497     inc_counter_np(SharedRuntime::_checkcast_array_copy_ctr);
1498     __ leave(); // required for proper stackwalking of RuntimeStub frame
1499     __ ret(0);
1500 
1501     return start;
1502   }
1503 
1504   //
1505   //  Generate 'unsafe' array copy stub
1506   //  Though just as safe as the other stubs, it takes an unscaled
1507   //  size_t argument instead of an element count.
1508   //
1509   //  Input:
1510   //    4(rsp)   - source array address
1511   //    8(rsp)   - destination array address
1512   //   12(rsp)   - byte count, can be zero
1513   //
1514   //  Output:
1515   //    rax, ==  0  -  success
1516   //    rax, == -1  -  need to call System.arraycopy
1517   //
1518   // Examines the alignment of the operands and dispatches
1519   // to a long, int, short, or byte copy loop.
1520   //
1521   address generate_unsafe_copy(const char *name,
1522                                address byte_copy_entry,
1523                                address short_copy_entry,
1524                                address int_copy_entry,
1525                                address long_copy_entry) {
1526 
1527     Label L_long_aligned, L_int_aligned, L_short_aligned;
1528 
1529     __ align(CodeEntryAlignment);
1530     StubCodeMark mark(this, "StubRoutines", name);
1531     address start = __ pc();
1532 
1533     const Register from       = rax;  // source array address
1534     const Register to         = rdx;  // destination array address
1535     const Register count      = rcx;  // elements count
1536 
1537     __ enter(); // required for proper stackwalking of RuntimeStub frame
1538     __ push(rsi);
1539     __ push(rdi);
1540     Address  from_arg(rsp, 12+ 4);      // from
1541     Address    to_arg(rsp, 12+ 8);      // to
1542     Address count_arg(rsp, 12+12);      // byte count
1543 
1544     // Load up:
1545     __ movptr(from ,  from_arg);
1546     __ movptr(to   ,    to_arg);
1547     __ movl2ptr(count, count_arg);
1548 
1549     // bump this on entry, not on exit:
1550     inc_counter_np(SharedRuntime::_unsafe_array_copy_ctr);
1551 
1552     const Register bits = rsi;
1553     __ mov(bits, from);
1554     __ orptr(bits, to);
1555     __ orptr(bits, count);
1556 
1557     __ testl(bits, BytesPerLong-1);
1558     __ jccb(Assembler::zero, L_long_aligned);
1559 
1560     __ testl(bits, BytesPerInt-1);
1561     __ jccb(Assembler::zero, L_int_aligned);
1562 
1563     __ testl(bits, BytesPerShort-1);
1564     __ jump_cc(Assembler::notZero, RuntimeAddress(byte_copy_entry));
1565 
1566     __ BIND(L_short_aligned);
1567     __ shrptr(count, LogBytesPerShort); // size => short_count
1568     __ movl(count_arg, count);          // update 'count'
1569     __ jump(RuntimeAddress(short_copy_entry));
1570 
1571     __ BIND(L_int_aligned);
1572     __ shrptr(count, LogBytesPerInt); // size => int_count
1573     __ movl(count_arg, count);          // update 'count'
1574     __ jump(RuntimeAddress(int_copy_entry));
1575 
1576     __ BIND(L_long_aligned);
1577     __ shrptr(count, LogBytesPerLong); // size => qword_count
1578     __ movl(count_arg, count);          // update 'count'
1579     __ pop(rdi); // Do pops here since jlong_arraycopy stub does not do it.
1580     __ pop(rsi);
1581     __ jump(RuntimeAddress(long_copy_entry));
1582 
1583     return start;
1584   }
1585 
1586 
1587   // Perform range checks on the proposed arraycopy.
1588   // Smashes src_pos and dst_pos.  (Uses them up for temps.)
1589   void arraycopy_range_checks(Register src,
1590                               Register src_pos,
1591                               Register dst,
1592                               Register dst_pos,
1593                               Address& length,
1594                               Label& L_failed) {
1595     BLOCK_COMMENT("arraycopy_range_checks:");
1596     const Register src_end = src_pos;   // source array end position
1597     const Register dst_end = dst_pos;   // destination array end position
1598     __ addl(src_end, length); // src_pos + length
1599     __ addl(dst_end, length); // dst_pos + length
1600 
1601     //  if (src_pos + length > arrayOop(src)->length() ) FAIL;
1602     __ cmpl(src_end, Address(src, arrayOopDesc::length_offset_in_bytes()));
1603     __ jcc(Assembler::above, L_failed);
1604 
1605     //  if (dst_pos + length > arrayOop(dst)->length() ) FAIL;
1606     __ cmpl(dst_end, Address(dst, arrayOopDesc::length_offset_in_bytes()));
1607     __ jcc(Assembler::above, L_failed);
1608 
1609     BLOCK_COMMENT("arraycopy_range_checks done");
1610   }
1611 
1612 
1613   //
1614   //  Generate generic array copy stubs
1615   //
1616   //  Input:
1617   //     4(rsp)    -  src oop
1618   //     8(rsp)    -  src_pos
1619   //    12(rsp)    -  dst oop
1620   //    16(rsp)    -  dst_pos
1621   //    20(rsp)    -  element count
1622   //
1623   //  Output:
1624   //    rax, ==  0  -  success
1625   //    rax, == -1^K - failure, where K is partial transfer count
1626   //
1627   address generate_generic_copy(const char *name,
1628                                 address entry_jbyte_arraycopy,
1629                                 address entry_jshort_arraycopy,
1630                                 address entry_jint_arraycopy,
1631                                 address entry_oop_arraycopy,
1632                                 address entry_jlong_arraycopy,
1633                                 address entry_checkcast_arraycopy) {
1634     Label L_failed, L_failed_0, L_objArray;
1635 
1636     { int modulus = CodeEntryAlignment;
1637       int target  = modulus - 5; // 5 = sizeof jmp(L_failed)
1638       int advance = target - (__ offset() % modulus);
1639       if (advance < 0)  advance += modulus;
1640       if (advance > 0)  __ nop(advance);
1641     }
1642     StubCodeMark mark(this, "StubRoutines", name);
1643 
1644     // Short-hop target to L_failed.  Makes for denser prologue code.
1645     __ BIND(L_failed_0);
1646     __ jmp(L_failed);
1647     assert(__ offset() % CodeEntryAlignment == 0, "no further alignment needed");
1648 
1649     __ align(CodeEntryAlignment);
1650     address start = __ pc();
1651 
1652     __ enter(); // required for proper stackwalking of RuntimeStub frame
1653     __ push(rsi);
1654     __ push(rdi);
1655 
1656     // bump this on entry, not on exit:
1657     inc_counter_np(SharedRuntime::_generic_array_copy_ctr);
1658 
1659     // Input values
1660     Address SRC     (rsp, 12+ 4);
1661     Address SRC_POS (rsp, 12+ 8);
1662     Address DST     (rsp, 12+12);
1663     Address DST_POS (rsp, 12+16);
1664     Address LENGTH  (rsp, 12+20);
1665 
1666     //-----------------------------------------------------------------------
1667     // Assembler stub will be used for this call to arraycopy
1668     // if the following conditions are met:
1669     //
1670     // (1) src and dst must not be null.
1671     // (2) src_pos must not be negative.
1672     // (3) dst_pos must not be negative.
1673     // (4) length  must not be negative.
1674     // (5) src klass and dst klass should be the same and not NULL.
1675     // (6) src and dst should be arrays.
1676     // (7) src_pos + length must not exceed length of src.
1677     // (8) dst_pos + length must not exceed length of dst.
1678     //
1679 
1680     const Register src     = rax;       // source array oop
1681     const Register src_pos = rsi;
1682     const Register dst     = rdx;       // destination array oop
1683     const Register dst_pos = rdi;
1684     const Register length  = rcx;       // transfer count
1685 
1686     //  if (src == NULL) return -1;
1687     __ movptr(src, SRC);      // src oop
1688     __ testptr(src, src);
1689     __ jccb(Assembler::zero, L_failed_0);
1690 
1691     //  if (src_pos < 0) return -1;
1692     __ movl2ptr(src_pos, SRC_POS);  // src_pos
1693     __ testl(src_pos, src_pos);
1694     __ jccb(Assembler::negative, L_failed_0);
1695 
1696     //  if (dst == NULL) return -1;
1697     __ movptr(dst, DST);      // dst oop
1698     __ testptr(dst, dst);
1699     __ jccb(Assembler::zero, L_failed_0);
1700 
1701     //  if (dst_pos < 0) return -1;
1702     __ movl2ptr(dst_pos, DST_POS);  // dst_pos
1703     __ testl(dst_pos, dst_pos);
1704     __ jccb(Assembler::negative, L_failed_0);
1705 
1706     //  if (length < 0) return -1;
1707     __ movl2ptr(length, LENGTH);   // length
1708     __ testl(length, length);
1709     __ jccb(Assembler::negative, L_failed_0);
1710 
1711     //  if (src->klass() == NULL) return -1;
1712     Address src_klass_addr(src, oopDesc::klass_offset_in_bytes());
1713     Address dst_klass_addr(dst, oopDesc::klass_offset_in_bytes());
1714     const Register rcx_src_klass = rcx;    // array klass
1715     __ movptr(rcx_src_klass, Address(src, oopDesc::klass_offset_in_bytes()));
1716 
1717 #ifdef ASSERT
1718     //  assert(src->klass() != NULL);
1719     BLOCK_COMMENT("assert klasses not null");
1720     { Label L1, L2;
1721       __ testptr(rcx_src_klass, rcx_src_klass);
1722       __ jccb(Assembler::notZero, L2);   // it is broken if klass is NULL
1723       __ bind(L1);
1724       __ stop("broken null klass");
1725       __ bind(L2);
1726       __ cmpptr(dst_klass_addr, (int32_t)NULL_WORD);
1727       __ jccb(Assembler::equal, L1);      // this would be broken also
1728       BLOCK_COMMENT("assert done");
1729     }
1730 #endif //ASSERT
1731 
1732     // Load layout helper (32-bits)
1733     //
1734     //  |array_tag|     | header_size | element_type |     |log2_element_size|
1735     // 32        30    24            16              8     2                 0
1736     //
1737     //   array_tag: typeArray = 0x3, objArray = 0x2, non-array = 0x0
1738     //
1739 
1740     int lh_offset = klassOopDesc::header_size() * HeapWordSize +
1741                     Klass::layout_helper_offset_in_bytes();
1742     Address src_klass_lh_addr(rcx_src_klass, lh_offset);
1743 
1744     // Handle objArrays completely differently...
1745     jint objArray_lh = Klass::array_layout_helper(T_OBJECT);
1746     __ cmpl(src_klass_lh_addr, objArray_lh);
1747     __ jcc(Assembler::equal, L_objArray);
1748 
1749     //  if (src->klass() != dst->klass()) return -1;
1750     __ cmpptr(rcx_src_klass, dst_klass_addr);
1751     __ jccb(Assembler::notEqual, L_failed_0);
1752 
1753     const Register rcx_lh = rcx;  // layout helper
1754     assert(rcx_lh == rcx_src_klass, "known alias");
1755     __ movl(rcx_lh, src_klass_lh_addr);
1756 
1757     //  if (!src->is_Array()) return -1;
1758     __ cmpl(rcx_lh, Klass::_lh_neutral_value);
1759     __ jcc(Assembler::greaterEqual, L_failed_0); // signed cmp
1760 
1761     // At this point, it is known to be a typeArray (array_tag 0x3).
1762 #ifdef ASSERT
1763     { Label L;
1764       __ cmpl(rcx_lh, (Klass::_lh_array_tag_type_value << Klass::_lh_array_tag_shift));
1765       __ jcc(Assembler::greaterEqual, L); // signed cmp
1766       __ stop("must be a primitive array");
1767       __ bind(L);
1768     }
1769 #endif
1770 
1771     assert_different_registers(src, src_pos, dst, dst_pos, rcx_lh);
1772     arraycopy_range_checks(src, src_pos, dst, dst_pos, LENGTH, L_failed);
1773 
1774     // typeArrayKlass
1775     //
1776     // src_addr = (src + array_header_in_bytes()) + (src_pos << log2elemsize);
1777     // dst_addr = (dst + array_header_in_bytes()) + (dst_pos << log2elemsize);
1778     //
1779     const Register rsi_offset = rsi; // array offset
1780     const Register src_array  = src; // src array offset
1781     const Register dst_array  = dst; // dst array offset
1782     const Register rdi_elsize = rdi; // log2 element size
1783 
1784     __ mov(rsi_offset, rcx_lh);
1785     __ shrptr(rsi_offset, Klass::_lh_header_size_shift);
1786     __ andptr(rsi_offset, Klass::_lh_header_size_mask);   // array_offset
1787     __ addptr(src_array, rsi_offset);  // src array offset
1788     __ addptr(dst_array, rsi_offset);  // dst array offset
1789     __ andptr(rcx_lh, Klass::_lh_log2_element_size_mask); // log2 elsize
1790 
1791     // next registers should be set before the jump to corresponding stub
1792     const Register from       = src; // source array address
1793     const Register to         = dst; // destination array address
1794     const Register count      = rcx; // elements count
1795     // some of them should be duplicated on stack
1796 #define FROM   Address(rsp, 12+ 4)
1797 #define TO     Address(rsp, 12+ 8)   // Not used now
1798 #define COUNT  Address(rsp, 12+12)   // Only for oop arraycopy
1799 
1800     BLOCK_COMMENT("scale indexes to element size");
1801     __ movl2ptr(rsi, SRC_POS);  // src_pos
1802     __ shlptr(rsi);             // src_pos << rcx (log2 elsize)
1803     assert(src_array == from, "");
1804     __ addptr(from, rsi);       // from = src_array + SRC_POS << log2 elsize
1805     __ movl2ptr(rdi, DST_POS);  // dst_pos
1806     __ shlptr(rdi);             // dst_pos << rcx (log2 elsize)
1807     assert(dst_array == to, "");
1808     __ addptr(to,  rdi);        // to   = dst_array + DST_POS << log2 elsize
1809     __ movptr(FROM, from);      // src_addr
1810     __ mov(rdi_elsize, rcx_lh); // log2 elsize
1811     __ movl2ptr(count, LENGTH); // elements count
1812 
1813     BLOCK_COMMENT("choose copy loop based on element size");
1814     __ cmpl(rdi_elsize, 0);
1815 
1816     __ jump_cc(Assembler::equal, RuntimeAddress(entry_jbyte_arraycopy));
1817     __ cmpl(rdi_elsize, LogBytesPerShort);
1818     __ jump_cc(Assembler::equal, RuntimeAddress(entry_jshort_arraycopy));
1819     __ cmpl(rdi_elsize, LogBytesPerInt);
1820     __ jump_cc(Assembler::equal, RuntimeAddress(entry_jint_arraycopy));
1821 #ifdef ASSERT
1822     __ cmpl(rdi_elsize, LogBytesPerLong);
1823     __ jccb(Assembler::notEqual, L_failed);
1824 #endif
1825     __ pop(rdi); // Do pops here since jlong_arraycopy stub does not do it.
1826     __ pop(rsi);
1827     __ jump(RuntimeAddress(entry_jlong_arraycopy));
1828 
1829   __ BIND(L_failed);
1830     __ xorptr(rax, rax);
1831     __ notptr(rax); // return -1
1832     __ pop(rdi);
1833     __ pop(rsi);
1834     __ leave(); // required for proper stackwalking of RuntimeStub frame
1835     __ ret(0);
1836 
1837     // objArrayKlass
1838   __ BIND(L_objArray);
1839     // live at this point:  rcx_src_klass, src[_pos], dst[_pos]
1840 
1841     Label L_plain_copy, L_checkcast_copy;
1842     //  test array classes for subtyping
1843     __ cmpptr(rcx_src_klass, dst_klass_addr); // usual case is exact equality
1844     __ jccb(Assembler::notEqual, L_checkcast_copy);
1845 
1846     // Identically typed arrays can be copied without element-wise checks.
1847     assert_different_registers(src, src_pos, dst, dst_pos, rcx_src_klass);
1848     arraycopy_range_checks(src, src_pos, dst, dst_pos, LENGTH, L_failed);
1849 
1850   __ BIND(L_plain_copy);
1851     __ movl2ptr(count, LENGTH); // elements count
1852     __ movl2ptr(src_pos, SRC_POS);  // reload src_pos
1853     __ lea(from, Address(src, src_pos, Address::times_ptr,
1854                  arrayOopDesc::base_offset_in_bytes(T_OBJECT))); // src_addr
1855     __ movl2ptr(dst_pos, DST_POS);  // reload dst_pos
1856     __ lea(to,   Address(dst, dst_pos, Address::times_ptr,
1857                  arrayOopDesc::base_offset_in_bytes(T_OBJECT))); // dst_addr
1858     __ movptr(FROM,  from);   // src_addr
1859     __ movptr(TO,    to);     // dst_addr
1860     __ movl(COUNT, count);  // count
1861     __ jump(RuntimeAddress(entry_oop_arraycopy));
1862 
1863   __ BIND(L_checkcast_copy);
1864     // live at this point:  rcx_src_klass, dst[_pos], src[_pos]
1865     {
1866       // Handy offsets:
1867       int  ek_offset = (klassOopDesc::header_size() * HeapWordSize +
1868                         objArrayKlass::element_klass_offset_in_bytes());
1869       int sco_offset = (klassOopDesc::header_size() * HeapWordSize +
1870                         Klass::super_check_offset_offset_in_bytes());
1871 
1872       Register rsi_dst_klass = rsi;
1873       Register rdi_temp      = rdi;
1874       assert(rsi_dst_klass == src_pos, "expected alias w/ src_pos");
1875       assert(rdi_temp      == dst_pos, "expected alias w/ dst_pos");
1876       Address dst_klass_lh_addr(rsi_dst_klass, lh_offset);
1877 
1878       // Before looking at dst.length, make sure dst is also an objArray.
1879       __ movptr(rsi_dst_klass, dst_klass_addr);
1880       __ cmpl(dst_klass_lh_addr, objArray_lh);
1881       __ jccb(Assembler::notEqual, L_failed);
1882 
1883       // It is safe to examine both src.length and dst.length.
1884       __ movl2ptr(src_pos, SRC_POS);        // reload rsi
1885       arraycopy_range_checks(src, src_pos, dst, dst_pos, LENGTH, L_failed);
1886       // (Now src_pos and dst_pos are killed, but not src and dst.)
1887 
1888       // We'll need this temp (don't forget to pop it after the type check).
1889       __ push(rbx);
1890       Register rbx_src_klass = rbx;
1891 
1892       __ mov(rbx_src_klass, rcx_src_klass); // spill away from rcx
1893       __ movptr(rsi_dst_klass, dst_klass_addr);
1894       Address super_check_offset_addr(rsi_dst_klass, sco_offset);
1895       Label L_fail_array_check;
1896       generate_type_check(rbx_src_klass,
1897                           super_check_offset_addr, dst_klass_addr,
1898                           rdi_temp, NULL, &L_fail_array_check);
1899       // (On fall-through, we have passed the array type check.)
1900       __ pop(rbx);
1901       __ jmp(L_plain_copy);
1902 
1903       __ BIND(L_fail_array_check);
1904       // Reshuffle arguments so we can call checkcast_arraycopy:
1905 
1906       // match initial saves for checkcast_arraycopy
1907       // push(rsi);    // already done; see above
1908       // push(rdi);    // already done; see above
1909       // push(rbx);    // already done; see above
1910 
1911       // Marshal outgoing arguments now, freeing registers.
1912       Address   from_arg(rsp, 16+ 4);   // from
1913       Address     to_arg(rsp, 16+ 8);   // to
1914       Address length_arg(rsp, 16+12);   // elements count
1915       Address  ckoff_arg(rsp, 16+16);   // super_check_offset
1916       Address  ckval_arg(rsp, 16+20);   // super_klass
1917 
1918       Address SRC_POS_arg(rsp, 16+ 8);
1919       Address DST_POS_arg(rsp, 16+16);
1920       Address  LENGTH_arg(rsp, 16+20);
1921       // push rbx, changed the incoming offsets (why not just use rbp,??)
1922       // assert(SRC_POS_arg.disp() == SRC_POS.disp() + 4, "");
1923 
1924       __ movptr(rbx, Address(rsi_dst_klass, ek_offset));
1925       __ movl2ptr(length, LENGTH_arg);    // reload elements count
1926       __ movl2ptr(src_pos, SRC_POS_arg);  // reload src_pos
1927       __ movl2ptr(dst_pos, DST_POS_arg);  // reload dst_pos
1928 
1929       __ movptr(ckval_arg, rbx);          // destination element type
1930       __ movl(rbx, Address(rbx, sco_offset));
1931       __ movl(ckoff_arg, rbx);          // corresponding class check offset
1932 
1933       __ movl(length_arg, length);      // outgoing length argument
1934 
1935       __ lea(from, Address(src, src_pos, Address::times_ptr,
1936                             arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
1937       __ movptr(from_arg, from);
1938 
1939       __ lea(to, Address(dst, dst_pos, Address::times_ptr,
1940                           arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
1941       __ movptr(to_arg, to);
1942       __ jump(RuntimeAddress(entry_checkcast_arraycopy));
1943     }
1944 
1945     return start;
1946   }
1947 
1948   void generate_arraycopy_stubs() {
1949     address entry;
1950     address entry_jbyte_arraycopy;
1951     address entry_jshort_arraycopy;
1952     address entry_jint_arraycopy;
1953     address entry_oop_arraycopy;
1954     address entry_jlong_arraycopy;
1955     address entry_checkcast_arraycopy;
1956 
1957     StubRoutines::_arrayof_jbyte_disjoint_arraycopy =
1958         generate_disjoint_copy(T_BYTE,  true, Address::times_1, &entry,
1959                                "arrayof_jbyte_disjoint_arraycopy");
1960     StubRoutines::_arrayof_jbyte_arraycopy =
1961         generate_conjoint_copy(T_BYTE,  true, Address::times_1,  entry,
1962                                NULL, "arrayof_jbyte_arraycopy");
1963     StubRoutines::_jbyte_disjoint_arraycopy =
1964         generate_disjoint_copy(T_BYTE, false, Address::times_1, &entry,
1965                                "jbyte_disjoint_arraycopy");
1966     StubRoutines::_jbyte_arraycopy =
1967         generate_conjoint_copy(T_BYTE, false, Address::times_1,  entry,
1968                                &entry_jbyte_arraycopy, "jbyte_arraycopy");
1969 
1970     StubRoutines::_arrayof_jshort_disjoint_arraycopy =
1971         generate_disjoint_copy(T_SHORT,  true, Address::times_2, &entry,
1972                                "arrayof_jshort_disjoint_arraycopy");
1973     StubRoutines::_arrayof_jshort_arraycopy =
1974         generate_conjoint_copy(T_SHORT,  true, Address::times_2,  entry,
1975                                NULL, "arrayof_jshort_arraycopy");
1976     StubRoutines::_jshort_disjoint_arraycopy =
1977         generate_disjoint_copy(T_SHORT, false, Address::times_2, &entry,
1978                                "jshort_disjoint_arraycopy");
1979     StubRoutines::_jshort_arraycopy =
1980         generate_conjoint_copy(T_SHORT, false, Address::times_2,  entry,
1981                                &entry_jshort_arraycopy, "jshort_arraycopy");
1982 
1983     // Next arrays are always aligned on 4 bytes at least.
1984     StubRoutines::_jint_disjoint_arraycopy =
1985         generate_disjoint_copy(T_INT, true, Address::times_4, &entry,
1986                                "jint_disjoint_arraycopy");
1987     StubRoutines::_jint_arraycopy =
1988         generate_conjoint_copy(T_INT, true, Address::times_4,  entry,
1989                                &entry_jint_arraycopy, "jint_arraycopy");
1990 
1991     StubRoutines::_oop_disjoint_arraycopy =
1992         generate_disjoint_copy(T_OBJECT, true, Address::times_ptr, &entry,
1993                                "oop_disjoint_arraycopy");
1994     StubRoutines::_oop_arraycopy =
1995         generate_conjoint_copy(T_OBJECT, true, Address::times_ptr,  entry,
1996                                &entry_oop_arraycopy, "oop_arraycopy");
1997 
1998     StubRoutines::_jlong_disjoint_arraycopy =
1999         generate_disjoint_long_copy(&entry, "jlong_disjoint_arraycopy");
2000     StubRoutines::_jlong_arraycopy =
2001         generate_conjoint_long_copy(entry, &entry_jlong_arraycopy,
2002                                     "jlong_arraycopy");
2003 
2004     StubRoutines::_arrayof_jint_disjoint_arraycopy  =
2005         StubRoutines::_jint_disjoint_arraycopy;
2006     StubRoutines::_arrayof_oop_disjoint_arraycopy   =
2007         StubRoutines::_oop_disjoint_arraycopy;
2008     StubRoutines::_arrayof_jlong_disjoint_arraycopy =
2009         StubRoutines::_jlong_disjoint_arraycopy;
2010 
2011     StubRoutines::_arrayof_jint_arraycopy  = StubRoutines::_jint_arraycopy;
2012     StubRoutines::_arrayof_oop_arraycopy   = StubRoutines::_oop_arraycopy;
2013     StubRoutines::_arrayof_jlong_arraycopy = StubRoutines::_jlong_arraycopy;
2014 
2015     StubRoutines::_checkcast_arraycopy =
2016         generate_checkcast_copy("checkcast_arraycopy",
2017                                   &entry_checkcast_arraycopy);
2018 
2019     StubRoutines::_unsafe_arraycopy =
2020         generate_unsafe_copy("unsafe_arraycopy",
2021                                entry_jbyte_arraycopy,
2022                                entry_jshort_arraycopy,
2023                                entry_jint_arraycopy,
2024                                entry_jlong_arraycopy);
2025 
2026     StubRoutines::_generic_arraycopy =
2027         generate_generic_copy("generic_arraycopy",
2028                                entry_jbyte_arraycopy,
2029                                entry_jshort_arraycopy,
2030                                entry_jint_arraycopy,
2031                                entry_oop_arraycopy,
2032                                entry_jlong_arraycopy,
2033                                entry_checkcast_arraycopy);
2034   }
2035 
2036   void generate_math_stubs() {
2037     {
2038       StubCodeMark mark(this, "StubRoutines", "log");
2039       StubRoutines::_intrinsic_log = (double (*)(double)) __ pc();
2040 
2041       __ fld_d(Address(rsp, 4));
2042       __ flog();
2043       __ ret(0);
2044     }
2045     {
2046       StubCodeMark mark(this, "StubRoutines", "log10");
2047       StubRoutines::_intrinsic_log10 = (double (*)(double)) __ pc();
2048 
2049       __ fld_d(Address(rsp, 4));
2050       __ flog10();
2051       __ ret(0);
2052     }
2053     {
2054       StubCodeMark mark(this, "StubRoutines", "sin");
2055       StubRoutines::_intrinsic_sin = (double (*)(double))  __ pc();
2056 
2057       __ fld_d(Address(rsp, 4));
2058       __ trigfunc('s');
2059       __ ret(0);
2060     }
2061     {
2062       StubCodeMark mark(this, "StubRoutines", "cos");
2063       StubRoutines::_intrinsic_cos = (double (*)(double)) __ pc();
2064 
2065       __ fld_d(Address(rsp, 4));
2066       __ trigfunc('c');
2067       __ ret(0);
2068     }
2069     {
2070       StubCodeMark mark(this, "StubRoutines", "tan");
2071       StubRoutines::_intrinsic_tan = (double (*)(double)) __ pc();
2072 
2073       __ fld_d(Address(rsp, 4));
2074       __ trigfunc('t');
2075       __ ret(0);
2076     }
2077 
2078     // The intrinsic version of these seem to return the same value as
2079     // the strict version.
2080     StubRoutines::_intrinsic_exp = SharedRuntime::dexp;
2081     StubRoutines::_intrinsic_pow = SharedRuntime::dpow;
2082   }
2083 
2084  public:
2085   // Information about frame layout at time of blocking runtime call.
2086   // Note that we only have to preserve callee-saved registers since
2087   // the compilers are responsible for supplying a continuation point
2088   // if they expect all registers to be preserved.
2089   enum layout {
2090     thread_off,    // last_java_sp
2091     rbp_off,       // callee saved register
2092     ret_pc,
2093     framesize
2094   };
2095 
2096  private:
2097 
2098 #undef  __
2099 #define __ masm->
2100 
2101   //------------------------------------------------------------------------------------------------------------------------
2102   // Continuation point for throwing of implicit exceptions that are not handled in
2103   // the current activation. Fabricates an exception oop and initiates normal
2104   // exception dispatching in this frame.
2105   //
2106   // Previously the compiler (c2) allowed for callee save registers on Java calls.
2107   // This is no longer true after adapter frames were removed but could possibly
2108   // be brought back in the future if the interpreter code was reworked and it
2109   // was deemed worthwhile. The comment below was left to describe what must
2110   // happen here if callee saves were resurrected. As it stands now this stub
2111   // could actually be a vanilla BufferBlob and have now oopMap at all.
2112   // Since it doesn't make much difference we've chosen to leave it the
2113   // way it was in the callee save days and keep the comment.
2114 
2115   // If we need to preserve callee-saved values we need a callee-saved oop map and
2116   // therefore have to make these stubs into RuntimeStubs rather than BufferBlobs.
2117   // If the compiler needs all registers to be preserved between the fault
2118   // point and the exception handler then it must assume responsibility for that in
2119   // AbstractCompiler::continuation_for_implicit_null_exception or
2120   // continuation_for_implicit_division_by_zero_exception. All other implicit
2121   // exceptions (e.g., NullPointerException or AbstractMethodError on entry) are
2122   // either at call sites or otherwise assume that stack unwinding will be initiated,
2123   // so caller saved registers were assumed volatile in the compiler.
2124   address generate_throw_exception(const char* name, address runtime_entry,
2125                                    bool restore_saved_exception_pc) {
2126 
2127     int insts_size = 256;
2128     int locs_size  = 32;
2129 
2130     CodeBuffer code(name, insts_size, locs_size);
2131     OopMapSet* oop_maps  = new OopMapSet();
2132     MacroAssembler* masm = new MacroAssembler(&code);
2133 
2134     address start = __ pc();
2135 
2136     // This is an inlined and slightly modified version of call_VM
2137     // which has the ability to fetch the return PC out of
2138     // thread-local storage and also sets up last_Java_sp slightly
2139     // differently than the real call_VM
2140     Register java_thread = rbx;
2141     __ get_thread(java_thread);
2142     if (restore_saved_exception_pc) {
2143       __ movptr(rax, Address(java_thread, in_bytes(JavaThread::saved_exception_pc_offset())));
2144       __ push(rax);
2145     }
2146 
2147     __ enter(); // required for proper stackwalking of RuntimeStub frame
2148 
2149     // pc and rbp, already pushed
2150     __ subptr(rsp, (framesize-2) * wordSize); // prolog
2151 
2152     // Frame is now completed as far as size and linkage.
2153 
2154     int frame_complete = __ pc() - start;
2155 
2156     // push java thread (becomes first argument of C function)
2157     __ movptr(Address(rsp, thread_off * wordSize), java_thread);
2158 
2159     // Set up last_Java_sp and last_Java_fp
2160     __ set_last_Java_frame(java_thread, rsp, rbp, NULL);
2161 
2162     // Call runtime
2163     BLOCK_COMMENT("call runtime_entry");
2164     __ call(RuntimeAddress(runtime_entry));
2165     // Generate oop map
2166     OopMap* map =  new OopMap(framesize, 0);
2167     oop_maps->add_gc_map(__ pc() - start, map);
2168 
2169     // restore the thread (cannot use the pushed argument since arguments
2170     // may be overwritten by C code generated by an optimizing compiler);
2171     // however can use the register value directly if it is callee saved.
2172     __ get_thread(java_thread);
2173 
2174     __ reset_last_Java_frame(java_thread, true, false);
2175 
2176     __ leave(); // required for proper stackwalking of RuntimeStub frame
2177 
2178     // check for pending exceptions
2179 #ifdef ASSERT
2180     Label L;
2181     __ cmpptr(Address(java_thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);
2182     __ jcc(Assembler::notEqual, L);
2183     __ should_not_reach_here();
2184     __ bind(L);
2185 #endif /* ASSERT */
2186     __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2187 
2188 
2189     RuntimeStub* stub = RuntimeStub::new_runtime_stub(name, &code, frame_complete, framesize, oop_maps, false);
2190     return stub->entry_point();
2191   }
2192 
2193 
2194   void create_control_words() {
2195     // Round to nearest, 53-bit mode, exceptions masked
2196     StubRoutines::_fpu_cntrl_wrd_std   = 0x027F;
2197     // Round to zero, 53-bit mode, exception mased
2198     StubRoutines::_fpu_cntrl_wrd_trunc = 0x0D7F;
2199     // Round to nearest, 24-bit mode, exceptions masked
2200     StubRoutines::_fpu_cntrl_wrd_24    = 0x007F;
2201     // Round to nearest, 64-bit mode, exceptions masked
2202     StubRoutines::_fpu_cntrl_wrd_64    = 0x037F;
2203     // Round to nearest, 64-bit mode, exceptions masked
2204     StubRoutines::_mxcsr_std           = 0x1F80;
2205     // Note: the following two constants are 80-bit values
2206     //       layout is critical for correct loading by FPU.
2207     // Bias for strict fp multiply/divide
2208     StubRoutines::_fpu_subnormal_bias1[0]= 0x00000000; // 2^(-15360) == 0x03ff 8000 0000 0000 0000
2209     StubRoutines::_fpu_subnormal_bias1[1]= 0x80000000;
2210     StubRoutines::_fpu_subnormal_bias1[2]= 0x03ff;
2211     // Un-Bias for strict fp multiply/divide
2212     StubRoutines::_fpu_subnormal_bias2[0]= 0x00000000; // 2^(+15360) == 0x7bff 8000 0000 0000 0000
2213     StubRoutines::_fpu_subnormal_bias2[1]= 0x80000000;
2214     StubRoutines::_fpu_subnormal_bias2[2]= 0x7bff;
2215   }
2216 
2217   //---------------------------------------------------------------------------
2218   // Initialization
2219 
2220   void generate_initial() {
2221     // Generates all stubs and initializes the entry points
2222 
2223     //------------------------------------------------------------------------------------------------------------------------
2224     // entry points that exist in all platforms
2225     // Note: This is code that could be shared among different platforms - however the benefit seems to be smaller than
2226     //       the disadvantage of having a much more complicated generator structure. See also comment in stubRoutines.hpp.
2227     StubRoutines::_forward_exception_entry      = generate_forward_exception();
2228 
2229     StubRoutines::_call_stub_entry              =
2230       generate_call_stub(StubRoutines::_call_stub_return_address);
2231     // is referenced by megamorphic call
2232     StubRoutines::_catch_exception_entry        = generate_catch_exception();
2233 
2234     // These are currently used by Solaris/Intel
2235     StubRoutines::_atomic_xchg_entry            = generate_atomic_xchg();
2236 
2237     StubRoutines::_handler_for_unsafe_access_entry =
2238       generate_handler_for_unsafe_access();
2239 
2240     // platform dependent
2241     create_control_words();
2242 
2243     StubRoutines::x86::_verify_mxcsr_entry                 = generate_verify_mxcsr();
2244     StubRoutines::x86::_verify_fpu_cntrl_wrd_entry         = generate_verify_fpu_cntrl_wrd();
2245     StubRoutines::_d2i_wrapper                              = generate_d2i_wrapper(T_INT,
2246                                                                                    CAST_FROM_FN_PTR(address, SharedRuntime::d2i));
2247     StubRoutines::_d2l_wrapper                              = generate_d2i_wrapper(T_LONG,
2248                                                                                    CAST_FROM_FN_PTR(address, SharedRuntime::d2l));
2249   }
2250 
2251 
2252   void generate_all() {
2253     // Generates all stubs and initializes the entry points
2254 
2255     // These entry points require SharedInfo::stack0 to be set up in non-core builds
2256     // and need to be relocatable, so they each fabricate a RuntimeStub internally.
2257     StubRoutines::_throw_AbstractMethodError_entry         = generate_throw_exception("AbstractMethodError throw_exception",          CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError),  false);
2258     StubRoutines::_throw_IncompatibleClassChangeError_entry= generate_throw_exception("IncompatibleClassChangeError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError),  false);
2259     StubRoutines::_throw_ArithmeticException_entry         = generate_throw_exception("ArithmeticException throw_exception",          CAST_FROM_FN_PTR(address, SharedRuntime::throw_ArithmeticException),  true);
2260     StubRoutines::_throw_NullPointerException_entry        = generate_throw_exception("NullPointerException throw_exception",         CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException), true);
2261     StubRoutines::_throw_NullPointerException_at_call_entry= generate_throw_exception("NullPointerException at call throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call), false);
2262     StubRoutines::_throw_StackOverflowError_entry          = generate_throw_exception("StackOverflowError throw_exception",           CAST_FROM_FN_PTR(address, SharedRuntime::throw_StackOverflowError),   false);
2263 
2264     //------------------------------------------------------------------------------------------------------------------------
2265     // entry points that are platform specific
2266 
2267     // support for verify_oop (must happen after universe_init)
2268     StubRoutines::_verify_oop_subroutine_entry     = generate_verify_oop();
2269 
2270     // arraycopy stubs used by compilers
2271     generate_arraycopy_stubs();
2272 
2273     generate_math_stubs();
2274   }
2275 
2276 
2277  public:
2278   StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
2279     if (all) {
2280       generate_all();
2281     } else {
2282       generate_initial();
2283     }
2284   }
2285 }; // end class declaration
2286 
2287 
2288 void StubGenerator_generate(CodeBuffer* code, bool all) {
2289   StubGenerator g(code, all);
2290 }