1 /*
   2  * Copyright (c) 1999, 2013, 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 "precompiled.hpp"
  26 #include "c1/c1_Defs.hpp"
  27 #include "c1/c1_MacroAssembler.hpp"
  28 #include "c1/c1_Runtime1.hpp"
  29 #include "interpreter/interpreter.hpp"
  30 #include "nativeInst_sparc.hpp"
  31 #include "oops/compiledICHolder.hpp"
  32 #include "oops/oop.inline.hpp"
  33 #include "prims/jvmtiExport.hpp"
  34 #include "register_sparc.hpp"
  35 #include "runtime/sharedRuntime.hpp"
  36 #include "runtime/signature.hpp"
  37 #include "runtime/vframeArray.hpp"
  38 #include "utilities/macros.hpp"
  39 #include "vmreg_sparc.inline.hpp"
  40 #if INCLUDE_ALL_GCS
  41 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
  42 #endif
  43 
  44 // Implementation of StubAssembler
  45 
  46 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry_point, int number_of_arguments) {
  47   // for sparc changing the number of arguments doesn't change
  48   // anything about the frame size so we'll always lie and claim that
  49   // we are only passing 1 argument.
  50   set_num_rt_args(1);
  51 
  52   assert_not_delayed();
  53   // bang stack before going to runtime
  54   set(-os::vm_page_size() + STACK_BIAS, G3_scratch);
  55   st(G0, SP, G3_scratch);
  56 
  57   // debugging support
  58   assert(number_of_arguments >= 0   , "cannot have negative number of arguments");
  59 
  60   set_last_Java_frame(SP, noreg);
  61   if (VerifyThread)  mov(G2_thread, O0); // about to be smashed; pass early
  62   save_thread(L7_thread_cache);
  63   // do the call
  64   call(entry_point, relocInfo::runtime_call_type);
  65   if (!VerifyThread) {
  66     delayed()->mov(G2_thread, O0);  // pass thread as first argument
  67   } else {
  68     delayed()->nop();             // (thread already passed)
  69   }
  70   int call_offset = offset();  // offset of return address
  71   restore_thread(L7_thread_cache);
  72   reset_last_Java_frame();
  73 
  74   // check for pending exceptions
  75   { Label L;
  76     Address exception_addr(G2_thread, Thread::pending_exception_offset());
  77     ld_ptr(exception_addr, Gtemp);
  78     br_null_short(Gtemp, pt, L);
  79     Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
  80     st_ptr(G0, vm_result_addr);
  81     Address vm_result_addr_2(G2_thread, JavaThread::vm_result_2_offset());
  82     st_ptr(G0, vm_result_addr_2);
  83 
  84     if (frame_size() == no_frame_size) {
  85       // we use O7 linkage so that forward_exception_entry has the issuing PC
  86       call(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);
  87       delayed()->restore();
  88     } else if (_stub_id == Runtime1::forward_exception_id) {
  89       should_not_reach_here();
  90     } else {
  91       AddressLiteral exc(Runtime1::entry_for(Runtime1::forward_exception_id));
  92       jump_to(exc, G4);
  93       delayed()->nop();
  94     }
  95     bind(L);
  96   }
  97 
  98   // get oop result if there is one and reset the value in the thread
  99   if (oop_result1->is_valid()) {                    // get oop result if there is one and reset it in the thread
 100     get_vm_result  (oop_result1);
 101   } else {
 102     // be a little paranoid and clear the result
 103     Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
 104     st_ptr(G0, vm_result_addr);
 105   }
 106 
 107   // get second result if there is one and reset the value in the thread
 108   if (metadata_result->is_valid()) {
 109     get_vm_result_2  (metadata_result);
 110   } else {
 111     // be a little paranoid and clear the result
 112     Address vm_result_addr_2(G2_thread, JavaThread::vm_result_2_offset());
 113     st_ptr(G0, vm_result_addr_2);
 114   }
 115 
 116   return call_offset;
 117 }
 118 
 119 
 120 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
 121   // O0 is reserved for the thread
 122   mov(arg1, O1);
 123   return call_RT(oop_result1, metadata_result, entry, 1);
 124 }
 125 
 126 
 127 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
 128   // O0 is reserved for the thread
 129   mov(arg1, O1);
 130   mov(arg2, O2); assert(arg2 != O1, "smashed argument");
 131   return call_RT(oop_result1, metadata_result, entry, 2);
 132 }
 133 
 134 
 135 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
 136   // O0 is reserved for the thread
 137   mov(arg1, O1);
 138   mov(arg2, O2); assert(arg2 != O1,               "smashed argument");
 139   mov(arg3, O3); assert(arg3 != O1 && arg3 != O2, "smashed argument");
 140   return call_RT(oop_result1, metadata_result, entry, 3);
 141 }
 142 
 143 
 144 // Implementation of Runtime1
 145 
 146 #define __ sasm->
 147 
 148 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
 149 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
 150 static int reg_save_size_in_words;
 151 static int frame_size_in_bytes = -1;
 152 
 153 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
 154   assert(frame_size_in_bytes == __ total_frame_size_in_bytes(reg_save_size_in_words),
 155          "mismatch in calculation");
 156   sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
 157   int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
 158   OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
 159 
 160   int i;
 161   for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
 162     Register r = as_Register(i);
 163     if (r == G1 || r == G3 || r == G4 || r == G5) {
 164       int sp_offset = cpu_reg_save_offsets[i];
 165       oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
 166                                 r->as_VMReg());
 167     }
 168   }
 169 
 170   if (save_fpu_registers) {
 171     for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
 172       FloatRegister r = as_FloatRegister(i);
 173       int sp_offset = fpu_reg_save_offsets[i];
 174       oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
 175                                 r->as_VMReg());
 176     }
 177   }
 178   return oop_map;
 179 }
 180 
 181 static OopMap* save_live_registers(StubAssembler* sasm, bool save_fpu_registers = true) {
 182   assert(frame_size_in_bytes == __ total_frame_size_in_bytes(reg_save_size_in_words),
 183          "mismatch in calculation");
 184   __ save_frame_c1(frame_size_in_bytes);
 185 
 186   // Record volatile registers as callee-save values in an OopMap so their save locations will be
 187   // propagated to the caller frame's RegisterMap during StackFrameStream construction (needed for
 188   // deoptimization; see compiledVFrame::create_stack_value).  The caller's I, L and O registers
 189   // are saved in register windows - I's and L's in the caller's frame and O's in the stub frame
 190   // (as the stub's I's) when the runtime routine called by the stub creates its frame.
 191   // OopMap frame sizes are in c2 stack slot sizes (sizeof(jint))
 192 
 193   int i;
 194   for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
 195     Register r = as_Register(i);
 196     if (r == G1 || r == G3 || r == G4 || r == G5) {
 197       int sp_offset = cpu_reg_save_offsets[i];
 198       __ st_ptr(r, SP, (sp_offset * BytesPerWord) + STACK_BIAS);
 199     }
 200   }
 201 
 202   if (save_fpu_registers) {
 203     for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
 204       FloatRegister r = as_FloatRegister(i);
 205       int sp_offset = fpu_reg_save_offsets[i];
 206       __ stf(FloatRegisterImpl::S, r, SP, (sp_offset * BytesPerWord) + STACK_BIAS);
 207     }
 208   }
 209 
 210   return generate_oop_map(sasm, save_fpu_registers);
 211 }
 212 
 213 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
 214   for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
 215     Register r = as_Register(i);
 216     if (r == G1 || r == G3 || r == G4 || r == G5) {
 217       __ ld_ptr(SP, (cpu_reg_save_offsets[i] * BytesPerWord) + STACK_BIAS, r);
 218     }
 219   }
 220 
 221   if (restore_fpu_registers) {
 222     for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
 223       FloatRegister r = as_FloatRegister(i);
 224       __ ldf(FloatRegisterImpl::S, SP, (fpu_reg_save_offsets[i] * BytesPerWord) + STACK_BIAS, r);
 225     }
 226   }
 227 }
 228 
 229 
 230 void Runtime1::initialize_pd() {
 231   // compute word offsets from SP at which live (non-windowed) registers are captured by stub routines
 232   //
 233   // A stub routine will have a frame that is at least large enough to hold
 234   // a register window save area (obviously) and the volatile g registers
 235   // and floating registers. A user of save_live_registers can have a frame
 236   // that has more scratch area in it (although typically they will use L-regs).
 237   // in that case the frame will look like this (stack growing down)
 238   //
 239   // FP -> |             |
 240   //       | scratch mem |
 241   //       |   "      "  |
 242   //       --------------
 243   //       | float regs  |
 244   //       |   "    "    |
 245   //       ---------------
 246   //       | G regs      |
 247   //       | "  "        |
 248   //       ---------------
 249   //       | abi reg.    |
 250   //       | window save |
 251   //       | area        |
 252   // SP -> ---------------
 253   //
 254   int i;
 255   int sp_offset = round_to(frame::register_save_words, 2); //  start doubleword aligned
 256 
 257   // only G int registers are saved explicitly; others are found in register windows
 258   for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
 259     Register r = as_Register(i);
 260     if (r == G1 || r == G3 || r == G4 || r == G5) {
 261       cpu_reg_save_offsets[i] = sp_offset;
 262       sp_offset++;
 263     }
 264   }
 265 
 266   // all float registers are saved explicitly
 267   assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
 268   for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
 269     fpu_reg_save_offsets[i] = sp_offset;
 270     sp_offset++;
 271   }
 272   reg_save_size_in_words = sp_offset - frame::memory_parameter_word_sp_offset;
 273   // this should match assembler::total_frame_size_in_bytes, which
 274   // isn't callable from this context.  It's checked by an assert when
 275   // it's used though.
 276   frame_size_in_bytes = align_size_up(sp_offset * wordSize, 8);
 277 }
 278 
 279 
 280 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
 281   // make a frame and preserve the caller's caller-save registers
 282   OopMap* oop_map = save_live_registers(sasm);
 283   int call_offset;
 284   if (!has_argument) {
 285     call_offset = __ call_RT(noreg, noreg, target);
 286   } else {
 287     call_offset = __ call_RT(noreg, noreg, target, G4);
 288   }
 289   OopMapSet* oop_maps = new OopMapSet();
 290   oop_maps->add_gc_map(call_offset, oop_map);
 291 
 292   __ should_not_reach_here();
 293   return oop_maps;
 294 }
 295 
 296 
 297 OopMapSet* Runtime1::generate_stub_call(StubAssembler* sasm, Register result, address target,
 298                                         Register arg1, Register arg2, Register arg3) {
 299   // make a frame and preserve the caller's caller-save registers
 300   OopMap* oop_map = save_live_registers(sasm);
 301 
 302   int call_offset;
 303   if (arg1 == noreg) {
 304     call_offset = __ call_RT(result, noreg, target);
 305   } else if (arg2 == noreg) {
 306     call_offset = __ call_RT(result, noreg, target, arg1);
 307   } else if (arg3 == noreg) {
 308     call_offset = __ call_RT(result, noreg, target, arg1, arg2);
 309   } else {
 310     call_offset = __ call_RT(result, noreg, target, arg1, arg2, arg3);
 311   }
 312   OopMapSet* oop_maps = NULL;
 313 
 314   oop_maps = new OopMapSet();
 315   oop_maps->add_gc_map(call_offset, oop_map);
 316   restore_live_registers(sasm);
 317 
 318   __ ret();
 319   __ delayed()->restore();
 320 
 321   return oop_maps;
 322 }
 323 
 324 
 325 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
 326   // make a frame and preserve the caller's caller-save registers
 327   OopMap* oop_map = save_live_registers(sasm);
 328 
 329   // call the runtime patching routine, returns non-zero if nmethod got deopted.
 330   int call_offset = __ call_RT(noreg, noreg, target);
 331   OopMapSet* oop_maps = new OopMapSet();
 332   oop_maps->add_gc_map(call_offset, oop_map);
 333 
 334   // re-execute the patched instruction or, if the nmethod was deoptmized, return to the
 335   // deoptimization handler entry that will cause re-execution of the current bytecode
 336   DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
 337   assert(deopt_blob != NULL, "deoptimization blob must have been created");
 338 
 339   Label no_deopt;
 340   __ br_null_short(O0, Assembler::pt, no_deopt);
 341 
 342   // return to the deoptimization handler entry for unpacking and rexecute
 343   // if we simply returned the we'd deopt as if any call we patched had just
 344   // returned.
 345 
 346   restore_live_registers(sasm);
 347 
 348   AddressLiteral dest(deopt_blob->unpack_with_reexecution());
 349   __ jump_to(dest, O0);
 350   __ delayed()->restore();
 351 
 352   __ bind(no_deopt);
 353   restore_live_registers(sasm);
 354   __ ret();
 355   __ delayed()->restore();
 356 
 357   return oop_maps;
 358 }
 359 
 360 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
 361 
 362   OopMapSet* oop_maps = NULL;
 363   // for better readability
 364   const bool must_gc_arguments = true;
 365   const bool dont_gc_arguments = false;
 366 
 367   // stub code & info for the different stubs
 368   switch (id) {
 369     case forward_exception_id:
 370       {
 371         oop_maps = generate_handle_exception(id, sasm);
 372       }
 373       break;
 374 
 375     case new_instance_id:
 376     case fast_new_instance_id:
 377     case fast_new_instance_init_check_id:
 378       {
 379         Register G5_klass = G5; // Incoming
 380         Register O0_obj   = O0; // Outgoing
 381 
 382         if (id == new_instance_id) {
 383           __ set_info("new_instance", dont_gc_arguments);
 384         } else if (id == fast_new_instance_id) {
 385           __ set_info("fast new_instance", dont_gc_arguments);
 386         } else {
 387           assert(id == fast_new_instance_init_check_id, "bad StubID");
 388           __ set_info("fast new_instance init check", dont_gc_arguments);
 389         }
 390 
 391         if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
 392             UseTLAB && FastTLABRefill) {
 393           Label slow_path;
 394           Register G1_obj_size = G1;
 395           Register G3_t1 = G3;
 396           Register G4_t2 = G4;
 397           assert_different_registers(G5_klass, G1_obj_size, G3_t1, G4_t2);
 398 
 399           // Push a frame since we may do dtrace notification for the
 400           // allocation which requires calling out and we don't want
 401           // to stomp the real return address.
 402           __ save_frame(0);
 403 
 404           if (id == fast_new_instance_init_check_id) {
 405             // make sure the klass is initialized
 406             __ ldub(G5_klass, in_bytes(InstanceKlass::init_state_offset()), G3_t1);
 407             __ cmp(G3_t1, InstanceKlass::fully_initialized);
 408             __ br(Assembler::notEqual, false, Assembler::pn, slow_path);
 409             __ delayed()->nop();
 410           }
 411 #ifdef ASSERT
 412           // assert object can be fast path allocated
 413           {
 414             Label ok, not_ok;
 415           __ ld(G5_klass, in_bytes(Klass::layout_helper_offset()), G1_obj_size);
 416           // make sure it's an instance (LH > 0)
 417           __ cmp_and_br_short(G1_obj_size, 0, Assembler::lessEqual, Assembler::pn, not_ok);
 418           __ btst(Klass::_lh_instance_slow_path_bit, G1_obj_size);
 419           __ br(Assembler::zero, false, Assembler::pn, ok);
 420           __ delayed()->nop();
 421           __ bind(not_ok);
 422           __ stop("assert(can be fast path allocated)");
 423           __ should_not_reach_here();
 424           __ bind(ok);
 425           }
 426 #endif // ASSERT
 427           // if we got here then the TLAB allocation failed, so try
 428           // refilling the TLAB or allocating directly from eden.
 429           Label retry_tlab, try_eden;
 430           __ tlab_refill(retry_tlab, try_eden, slow_path); // preserves G5_klass
 431 
 432           __ bind(retry_tlab);
 433 
 434           // get the instance size
 435           __ ld(G5_klass, in_bytes(Klass::layout_helper_offset()), G1_obj_size);
 436 
 437           __ tlab_allocate(O0_obj, G1_obj_size, 0, G3_t1, slow_path);
 438 
 439           __ initialize_object(O0_obj, G5_klass, G1_obj_size, 0, G3_t1, G4_t2);
 440           __ verify_oop(O0_obj);
 441           __ mov(O0, I0);
 442           __ ret();
 443           __ delayed()->restore();
 444 
 445           __ bind(try_eden);
 446           // get the instance size
 447           __ ld(G5_klass, in_bytes(Klass::layout_helper_offset()), G1_obj_size);
 448           __ eden_allocate(O0_obj, G1_obj_size, 0, G3_t1, G4_t2, slow_path);
 449           __ incr_allocated_bytes(G1_obj_size, G3_t1, G4_t2);
 450 
 451           __ initialize_object(O0_obj, G5_klass, G1_obj_size, 0, G3_t1, G4_t2);
 452           __ verify_oop(O0_obj);
 453           __ mov(O0, I0);
 454           __ ret();
 455           __ delayed()->restore();
 456 
 457           __ bind(slow_path);
 458 
 459           // pop this frame so generate_stub_call can push it's own
 460           __ restore();
 461         }
 462 
 463         oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_instance), G5_klass);
 464         // I0->O0: new instance
 465       }
 466 
 467       break;
 468 
 469     case counter_overflow_id:
 470         // G4 contains bci, G5 contains method
 471       oop_maps = generate_stub_call(sasm, noreg, CAST_FROM_FN_PTR(address, counter_overflow), G4, G5);
 472       break;
 473 
 474     case new_type_array_id:
 475     case new_object_array_id:
 476       {
 477         Register G5_klass = G5; // Incoming
 478         Register G4_length = G4; // Incoming
 479         Register O0_obj   = O0; // Outgoing
 480 
 481         Address klass_lh(G5_klass, Klass::layout_helper_offset());
 482         assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
 483         assert(Klass::_lh_header_size_mask == 0xFF, "bytewise");
 484         // Use this offset to pick out an individual byte of the layout_helper:
 485         const int klass_lh_header_size_offset = ((BytesPerInt - 1)  // 3 - 2 selects byte {0,1,0,0}
 486                                                  - Klass::_lh_header_size_shift / BitsPerByte);
 487 
 488         if (id == new_type_array_id) {
 489           __ set_info("new_type_array", dont_gc_arguments);
 490         } else {
 491           __ set_info("new_object_array", dont_gc_arguments);
 492         }
 493 
 494 #ifdef ASSERT
 495         // assert object type is really an array of the proper kind
 496         {
 497           Label ok;
 498           Register G3_t1 = G3;
 499           __ ld(klass_lh, G3_t1);
 500           __ sra(G3_t1, Klass::_lh_array_tag_shift, G3_t1);
 501           int tag = ((id == new_type_array_id)
 502                      ? Klass::_lh_array_tag_type_value
 503                      : Klass::_lh_array_tag_obj_value);
 504           __ cmp_and_brx_short(G3_t1, tag, Assembler::equal, Assembler::pt, ok);
 505           __ stop("assert(is an array klass)");
 506           __ should_not_reach_here();
 507           __ bind(ok);
 508         }
 509 #endif // ASSERT
 510 
 511         if (UseTLAB && FastTLABRefill) {
 512           Label slow_path;
 513           Register G1_arr_size = G1;
 514           Register G3_t1 = G3;
 515           Register O1_t2 = O1;
 516           assert_different_registers(G5_klass, G4_length, G1_arr_size, G3_t1, O1_t2);
 517 
 518           // check that array length is small enough for fast path
 519           __ set(C1_MacroAssembler::max_array_allocation_length, G3_t1);
 520           __ cmp(G4_length, G3_t1);
 521           __ br(Assembler::greaterUnsigned, false, Assembler::pn, slow_path);
 522           __ delayed()->nop();
 523 
 524           // if we got here then the TLAB allocation failed, so try
 525           // refilling the TLAB or allocating directly from eden.
 526           Label retry_tlab, try_eden;
 527           __ tlab_refill(retry_tlab, try_eden, slow_path); // preserves G4_length and G5_klass
 528 
 529           __ bind(retry_tlab);
 530 
 531           // get the allocation size: (length << (layout_helper & 0x1F)) + header_size
 532           __ ld(klass_lh, G3_t1);
 533           __ sll(G4_length, G3_t1, G1_arr_size);
 534           __ srl(G3_t1, Klass::_lh_header_size_shift, G3_t1);
 535           __ and3(G3_t1, Klass::_lh_header_size_mask, G3_t1);
 536           __ add(G1_arr_size, G3_t1, G1_arr_size);
 537           __ add(G1_arr_size, MinObjAlignmentInBytesMask, G1_arr_size);  // align up
 538           __ and3(G1_arr_size, ~MinObjAlignmentInBytesMask, G1_arr_size);
 539 
 540           __ tlab_allocate(O0_obj, G1_arr_size, 0, G3_t1, slow_path);  // preserves G1_arr_size
 541 
 542           __ initialize_header(O0_obj, G5_klass, G4_length, G3_t1, O1_t2);
 543           __ ldub(klass_lh, G3_t1, klass_lh_header_size_offset);
 544           __ sub(G1_arr_size, G3_t1, O1_t2);  // body length
 545           __ add(O0_obj, G3_t1, G3_t1);       // body start
 546           __ initialize_body(G3_t1, O1_t2);
 547           __ verify_oop(O0_obj);
 548           __ retl();
 549           __ delayed()->nop();
 550 
 551           __ bind(try_eden);
 552           // get the allocation size: (length << (layout_helper & 0x1F)) + header_size
 553           __ ld(klass_lh, G3_t1);
 554           __ sll(G4_length, G3_t1, G1_arr_size);
 555           __ srl(G3_t1, Klass::_lh_header_size_shift, G3_t1);
 556           __ and3(G3_t1, Klass::_lh_header_size_mask, G3_t1);
 557           __ add(G1_arr_size, G3_t1, G1_arr_size);
 558           __ add(G1_arr_size, MinObjAlignmentInBytesMask, G1_arr_size);
 559           __ and3(G1_arr_size, ~MinObjAlignmentInBytesMask, G1_arr_size);
 560 
 561           __ eden_allocate(O0_obj, G1_arr_size, 0, G3_t1, O1_t2, slow_path);  // preserves G1_arr_size
 562           __ incr_allocated_bytes(G1_arr_size, G3_t1, O1_t2);
 563 
 564           __ initialize_header(O0_obj, G5_klass, G4_length, G3_t1, O1_t2);
 565           __ ldub(klass_lh, G3_t1, klass_lh_header_size_offset);
 566           __ sub(G1_arr_size, G3_t1, O1_t2);  // body length
 567           __ add(O0_obj, G3_t1, G3_t1);       // body start
 568           __ initialize_body(G3_t1, O1_t2);
 569           __ verify_oop(O0_obj);
 570           __ retl();
 571           __ delayed()->nop();
 572 
 573           __ bind(slow_path);
 574         }
 575 
 576         if (id == new_type_array_id) {
 577           oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_type_array), G5_klass, G4_length);
 578         } else {
 579           oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_object_array), G5_klass, G4_length);
 580         }
 581         // I0 -> O0: new array
 582       }
 583       break;
 584 
 585     case new_multi_array_id:
 586       { // O0: klass
 587         // O1: rank
 588         // O2: address of 1st dimension
 589         __ set_info("new_multi_array", dont_gc_arguments);
 590         oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_multi_array), I0, I1, I2);
 591         // I0 -> O0: new multi array
 592       }
 593       break;
 594 
 595     case register_finalizer_id:
 596       {
 597         __ set_info("register_finalizer", dont_gc_arguments);
 598 
 599         // load the klass and check the has finalizer flag
 600         Label register_finalizer;
 601         Register t = O1;
 602         __ load_klass(O0, t);
 603         __ ld(t, in_bytes(Klass::access_flags_offset()), t);
 604         __ set(JVM_ACC_HAS_FINALIZER, G3);
 605         __ andcc(G3, t, G0);
 606         __ br(Assembler::notZero, false, Assembler::pt, register_finalizer);
 607         __ delayed()->nop();
 608 
 609         // do a leaf return
 610         __ retl();
 611         __ delayed()->nop();
 612 
 613         __ bind(register_finalizer);
 614         OopMap* oop_map = save_live_registers(sasm);
 615         int call_offset = __ call_RT(noreg, noreg,
 616                                      CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), I0);
 617         oop_maps = new OopMapSet();
 618         oop_maps->add_gc_map(call_offset, oop_map);
 619 
 620         // Now restore all the live registers
 621         restore_live_registers(sasm);
 622 
 623         __ ret();
 624         __ delayed()->restore();
 625       }
 626       break;
 627 
 628     case throw_range_check_failed_id:
 629       { __ set_info("range_check_failed", dont_gc_arguments); // arguments will be discarded
 630         // G4: index
 631         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
 632       }
 633       break;
 634 
 635     case throw_index_exception_id:
 636       { __ set_info("index_range_check_failed", dont_gc_arguments); // arguments will be discarded
 637         // G4: index
 638         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
 639       }
 640       break;
 641 
 642     case throw_div0_exception_id:
 643       { __ set_info("throw_div0_exception", dont_gc_arguments);
 644         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
 645       }
 646       break;
 647 
 648     case throw_null_pointer_exception_id:
 649       { __ set_info("throw_null_pointer_exception", dont_gc_arguments);
 650         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
 651       }
 652       break;
 653 
 654     case handle_exception_id:
 655       { __ set_info("handle_exception", dont_gc_arguments);
 656         oop_maps = generate_handle_exception(id, sasm);
 657       }
 658       break;
 659 
 660     case handle_exception_from_callee_id:
 661       { __ set_info("handle_exception_from_callee", dont_gc_arguments);
 662         oop_maps = generate_handle_exception(id, sasm);
 663       }
 664       break;
 665 
 666     case unwind_exception_id:
 667       {
 668         // O0: exception
 669         // I7: address of call to this method
 670 
 671         __ set_info("unwind_exception", dont_gc_arguments);
 672         __ mov(Oexception, Oexception->after_save());
 673         __ add(I7, frame::pc_return_offset, Oissuing_pc->after_save());
 674 
 675         __ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address),
 676                         G2_thread, Oissuing_pc->after_save());
 677         __ verify_not_null_oop(Oexception->after_save());
 678 
 679         // Restore SP from L7 if the exception PC is a method handle call site.
 680         __ mov(O0, G5);  // Save the target address.
 681         __ lduw(Address(G2_thread, JavaThread::is_method_handle_return_offset()), L0);
 682         __ tst(L0);  // Condition codes are preserved over the restore.
 683         __ restore();
 684 
 685         __ jmp(G5, 0);
 686         __ delayed()->movcc(Assembler::notZero, false, Assembler::icc, L7_mh_SP_save, SP);  // Restore SP if required.
 687       }
 688       break;
 689 
 690     case throw_array_store_exception_id:
 691       {
 692         __ set_info("throw_array_store_exception", dont_gc_arguments);
 693         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
 694       }
 695       break;
 696 
 697     case throw_class_cast_exception_id:
 698       {
 699         // G4: object
 700         __ set_info("throw_class_cast_exception", dont_gc_arguments);
 701         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
 702       }
 703       break;
 704 
 705     case throw_incompatible_class_change_error_id:
 706       {
 707         __ set_info("throw_incompatible_class_cast_exception", dont_gc_arguments);
 708         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
 709       }
 710       break;
 711 
 712     case slow_subtype_check_id:
 713       { // Support for uint StubRoutine::partial_subtype_check( Klass sub, Klass super );
 714         // Arguments :
 715         //
 716         //      ret  : G3
 717         //      sub  : G3, argument, destroyed
 718         //      super: G1, argument, not changed
 719         //      raddr: O7, blown by call
 720         Label miss;
 721 
 722         __ save_frame(0);               // Blow no registers!
 723 
 724         __ check_klass_subtype_slow_path(G3, G1, L0, L1, L2, L4, NULL, &miss);
 725 
 726         __ mov(1, G3);
 727         __ ret();                       // Result in G5 is 'true'
 728         __ delayed()->restore();        // free copy or add can go here
 729 
 730         __ bind(miss);
 731         __ mov(0, G3);
 732         __ ret();                       // Result in G5 is 'false'
 733         __ delayed()->restore();        // free copy or add can go here
 734       }
 735 
 736     case monitorenter_nofpu_id:
 737     case monitorenter_id:
 738       { // G4: object
 739         // G5: lock address
 740         __ set_info("monitorenter", dont_gc_arguments);
 741 
 742         int save_fpu_registers = (id == monitorenter_id);
 743         // make a frame and preserve the caller's caller-save registers
 744         OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
 745 
 746         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), G4, G5);
 747 
 748         oop_maps = new OopMapSet();
 749         oop_maps->add_gc_map(call_offset, oop_map);
 750         restore_live_registers(sasm, save_fpu_registers);
 751 
 752         __ ret();
 753         __ delayed()->restore();
 754       }
 755       break;
 756 
 757     case monitorexit_nofpu_id:
 758     case monitorexit_id:
 759       { // G4: lock address
 760         // note: really a leaf routine but must setup last java sp
 761         //       => use call_RT for now (speed can be improved by
 762         //       doing last java sp setup manually)
 763         __ set_info("monitorexit", dont_gc_arguments);
 764 
 765         int save_fpu_registers = (id == monitorexit_id);
 766         // make a frame and preserve the caller's caller-save registers
 767         OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
 768 
 769         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), G4);
 770 
 771         oop_maps = new OopMapSet();
 772         oop_maps->add_gc_map(call_offset, oop_map);
 773         restore_live_registers(sasm, save_fpu_registers);
 774 
 775         __ ret();
 776         __ delayed()->restore();
 777       }
 778       break;
 779 
 780     case deoptimize_id:
 781       {
 782         __ set_info("deoptimize", dont_gc_arguments);
 783         OopMap* oop_map = save_live_registers(sasm);
 784         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), G4);
 785         oop_maps = new OopMapSet();
 786         oop_maps->add_gc_map(call_offset, oop_map);
 787         restore_live_registers(sasm);
 788         DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
 789         assert(deopt_blob != NULL, "deoptimization blob must have been created");
 790         AddressLiteral dest(deopt_blob->unpack_with_reexecution());
 791         __ jump_to(dest, O0);
 792         __ delayed()->restore();
 793       }
 794       break;
 795 
 796     case access_field_patching_id:
 797       { __ set_info("access_field_patching", dont_gc_arguments);
 798         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
 799       }
 800       break;
 801 
 802     case load_klass_patching_id:
 803       { __ set_info("load_klass_patching", dont_gc_arguments);
 804         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
 805       }
 806       break;
 807 
 808     case load_mirror_patching_id:
 809       { __ set_info("load_mirror_patching", dont_gc_arguments);
 810         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
 811       }
 812       break;
 813 
 814     case load_appendix_patching_id:
 815       { __ set_info("load_appendix_patching", dont_gc_arguments);
 816         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
 817       }
 818       break;
 819 
 820     case dtrace_object_alloc_id:
 821       { // O0: object
 822         __ set_info("dtrace_object_alloc", dont_gc_arguments);
 823         // we can't gc here so skip the oopmap but make sure that all
 824         // the live registers get saved.
 825         save_live_registers(sasm);
 826 
 827         __ save_thread(L7_thread_cache);
 828         __ call(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc),
 829                 relocInfo::runtime_call_type);
 830         __ delayed()->mov(I0, O0);
 831         __ restore_thread(L7_thread_cache);
 832 
 833         restore_live_registers(sasm);
 834         __ ret();
 835         __ delayed()->restore();
 836       }
 837       break;
 838 
 839 #if INCLUDE_ALL_GCS
 840     case g1_pre_barrier_slow_id:
 841       { // G4: previous value of memory
 842         BarrierSet* bs = Universe::heap()->barrier_set();
 843         if (bs->kind() != BarrierSet::G1SATBCTLogging) {
 844           __ save_frame(0);
 845           __ set((int)id, O1);
 846           __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), I0);
 847           __ should_not_reach_here();
 848           break;
 849         }
 850 
 851         __ set_info("g1_pre_barrier_slow_id", dont_gc_arguments);
 852 
 853         Register pre_val = G4;
 854         Register tmp  = G1_scratch;
 855         Register tmp2 = G3_scratch;
 856 
 857         Label refill, restart;
 858         bool with_frame = false; // I don't know if we can do with-frame.
 859         int satb_q_index_byte_offset =
 860           in_bytes(JavaThread::satb_mark_queue_offset() +
 861                    PtrQueue::byte_offset_of_index());
 862         int satb_q_buf_byte_offset =
 863           in_bytes(JavaThread::satb_mark_queue_offset() +
 864                    PtrQueue::byte_offset_of_buf());
 865 
 866         __ bind(restart);
 867         // Load the index into the SATB buffer. PtrQueue::_index is a
 868         // size_t so ld_ptr is appropriate
 869         __ ld_ptr(G2_thread, satb_q_index_byte_offset, tmp);
 870 
 871         // index == 0?
 872         __ cmp_and_brx_short(tmp, G0, Assembler::equal, Assembler::pn, refill);
 873 
 874         __ ld_ptr(G2_thread, satb_q_buf_byte_offset, tmp2);
 875         __ sub(tmp, oopSize, tmp);
 876 
 877         __ st_ptr(pre_val, tmp2, tmp);  // [_buf + index] := <address_of_card>
 878         // Use return-from-leaf
 879         __ retl();
 880         __ delayed()->st_ptr(tmp, G2_thread, satb_q_index_byte_offset);
 881 
 882         __ bind(refill);
 883         __ save_frame(0);
 884 
 885         __ mov(pre_val, L0);
 886         __ mov(tmp,     L1);
 887         __ mov(tmp2,    L2);
 888 
 889         __ call_VM_leaf(L7_thread_cache,
 890                         CAST_FROM_FN_PTR(address,
 891                                          SATBMarkQueueSet::handle_zero_index_for_thread),
 892                                          G2_thread);
 893 
 894         __ mov(L0, pre_val);
 895         __ mov(L1, tmp);
 896         __ mov(L2, tmp2);
 897 
 898         __ br(Assembler::always, /*annul*/false, Assembler::pt, restart);
 899         __ delayed()->restore();
 900       }
 901       break;
 902 
 903     case g1_post_barrier_slow_id:
 904       {
 905         BarrierSet* bs = Universe::heap()->barrier_set();
 906         if (bs->kind() != BarrierSet::G1SATBCTLogging) {
 907           __ save_frame(0);
 908           __ set((int)id, O1);
 909           __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), I0);
 910           __ should_not_reach_here();
 911           break;
 912         }
 913 
 914         __ set_info("g1_post_barrier_slow_id", dont_gc_arguments);
 915 
 916         Register addr = G4;
 917         Register cardtable = G5;
 918         Register tmp  = G1_scratch;
 919         Register tmp2 = G3_scratch;
 920         jbyte* byte_map_base = ((CardTableModRefBS*)bs)->byte_map_base;
 921 
 922         Label not_already_dirty, restart, refill, young_card;
 923 
 924 #ifdef _LP64
 925         __ srlx(addr, CardTableModRefBS::card_shift, addr);
 926 #else
 927         __ srl(addr, CardTableModRefBS::card_shift, addr);
 928 #endif
 929 
 930         AddressLiteral rs(byte_map_base);
 931         __ set(rs, cardtable);         // cardtable := <card table base>
 932         __ ldub(addr, cardtable, tmp); // tmp := [addr + cardtable]
 933 
 934         __ cmp_and_br_short(tmp, G1SATBCardTableModRefBS::g1_young_card_val(), Assembler::equal, Assembler::pt, young_card);
 935 
 936         __ membar(Assembler::Membar_mask_bits(Assembler::StoreLoad));
 937         __ ldub(addr, cardtable, tmp); // tmp := [addr + cardtable]
 938 
 939         assert(CardTableModRefBS::dirty_card_val() == 0, "otherwise check this code");
 940         __ cmp_and_br_short(tmp, G0, Assembler::notEqual, Assembler::pt, not_already_dirty);
 941 
 942         __ bind(young_card);
 943         // We didn't take the branch, so we're already dirty: return.
 944         // Use return-from-leaf
 945         __ retl();
 946         __ delayed()->nop();
 947 
 948         // Not dirty.
 949         __ bind(not_already_dirty);
 950 
 951         // Get cardtable + tmp into a reg by itself
 952         __ add(addr, cardtable, tmp2);
 953 
 954         // First, dirty it.
 955         __ stb(G0, tmp2, 0);  // [cardPtr] := 0  (i.e., dirty).
 956 
 957         Register tmp3 = cardtable;
 958         Register tmp4 = tmp;
 959 
 960         // these registers are now dead
 961         addr = cardtable = tmp = noreg;
 962 
 963         int dirty_card_q_index_byte_offset =
 964           in_bytes(JavaThread::dirty_card_queue_offset() +
 965                    PtrQueue::byte_offset_of_index());
 966         int dirty_card_q_buf_byte_offset =
 967           in_bytes(JavaThread::dirty_card_queue_offset() +
 968                    PtrQueue::byte_offset_of_buf());
 969 
 970         __ bind(restart);
 971 
 972         // Get the index into the update buffer. PtrQueue::_index is
 973         // a size_t so ld_ptr is appropriate here.
 974         __ ld_ptr(G2_thread, dirty_card_q_index_byte_offset, tmp3);
 975 
 976         // index == 0?
 977         __ cmp_and_brx_short(tmp3, G0, Assembler::equal,  Assembler::pn, refill);
 978 
 979         __ ld_ptr(G2_thread, dirty_card_q_buf_byte_offset, tmp4);
 980         __ sub(tmp3, oopSize, tmp3);
 981 
 982         __ st_ptr(tmp2, tmp4, tmp3);  // [_buf + index] := <address_of_card>
 983         // Use return-from-leaf
 984         __ retl();
 985         __ delayed()->st_ptr(tmp3, G2_thread, dirty_card_q_index_byte_offset);
 986 
 987         __ bind(refill);
 988         __ save_frame(0);
 989 
 990         __ mov(tmp2, L0);
 991         __ mov(tmp3, L1);
 992         __ mov(tmp4, L2);
 993 
 994         __ call_VM_leaf(L7_thread_cache,
 995                         CAST_FROM_FN_PTR(address,
 996                                          DirtyCardQueueSet::handle_zero_index_for_thread),
 997                                          G2_thread);
 998 
 999         __ mov(L0, tmp2);
1000         __ mov(L1, tmp3);
1001         __ mov(L2, tmp4);
1002 
1003         __ br(Assembler::always, /*annul*/false, Assembler::pt, restart);
1004         __ delayed()->restore();
1005       }
1006       break;
1007 #endif // INCLUDE_ALL_GCS
1008 
1009     case predicate_failed_trap_id:
1010       {
1011         __ set_info("predicate_failed_trap", dont_gc_arguments);
1012         OopMap* oop_map = save_live_registers(sasm);
1013 
1014         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1015 
1016         oop_maps = new OopMapSet();
1017         oop_maps->add_gc_map(call_offset, oop_map);
1018 
1019         DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1020         assert(deopt_blob != NULL, "deoptimization blob must have been created");
1021         restore_live_registers(sasm);
1022 
1023         AddressLiteral dest(deopt_blob->unpack_with_reexecution());
1024         __ jump_to(dest, O0);
1025         __ delayed()->restore();
1026       }
1027       break;
1028 
1029     default:
1030       { __ set_info("unimplemented entry", dont_gc_arguments);
1031         __ save_frame(0);
1032         __ set((int)id, O1);
1033         __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), O1);
1034         __ should_not_reach_here();
1035       }
1036       break;
1037   }
1038   return oop_maps;
1039 }
1040 
1041 
1042 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler* sasm) {
1043   __ block_comment("generate_handle_exception");
1044 
1045   // Save registers, if required.
1046   OopMapSet* oop_maps = new OopMapSet();
1047   OopMap* oop_map = NULL;
1048   switch (id) {
1049   case forward_exception_id:
1050     // We're handling an exception in the context of a compiled frame.
1051     // The registers have been saved in the standard places.  Perform
1052     // an exception lookup in the caller and dispatch to the handler
1053     // if found.  Otherwise unwind and dispatch to the callers
1054     // exception handler.
1055      oop_map = generate_oop_map(sasm, true);
1056 
1057      // transfer the pending exception to the exception_oop
1058      __ ld_ptr(G2_thread, in_bytes(JavaThread::pending_exception_offset()), Oexception);
1059      __ ld_ptr(Oexception, 0, G0);
1060      __ st_ptr(G0, G2_thread, in_bytes(JavaThread::pending_exception_offset()));
1061      __ add(I7, frame::pc_return_offset, Oissuing_pc);
1062     break;
1063   case handle_exception_id:
1064     // At this point all registers MAY be live.
1065     oop_map = save_live_registers(sasm);
1066     __ mov(Oexception->after_save(),  Oexception);
1067     __ mov(Oissuing_pc->after_save(), Oissuing_pc);
1068     break;
1069   case handle_exception_from_callee_id:
1070     // At this point all registers except exception oop (Oexception)
1071     // and exception pc (Oissuing_pc) are dead.
1072     oop_map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
1073     sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
1074     __ save_frame_c1(frame_size_in_bytes);
1075     __ mov(Oexception->after_save(),  Oexception);
1076     __ mov(Oissuing_pc->after_save(), Oissuing_pc);
1077     break;
1078   default:  ShouldNotReachHere();
1079   }
1080 
1081   __ verify_not_null_oop(Oexception);
1082 
1083 #ifdef ASSERT
1084   // check that fields in JavaThread for exception oop and issuing pc are
1085   // empty before writing to them
1086   Label oop_empty;
1087   Register scratch = I7;  // We can use I7 here because it's overwritten later anyway.
1088   __ ld_ptr(Address(G2_thread, JavaThread::exception_oop_offset()), scratch);
1089   __ br_null(scratch, false, Assembler::pt, oop_empty);
1090   __ delayed()->nop();
1091   __ stop("exception oop already set");
1092   __ bind(oop_empty);
1093 
1094   Label pc_empty;
1095   __ ld_ptr(Address(G2_thread, JavaThread::exception_pc_offset()), scratch);
1096   __ br_null(scratch, false, Assembler::pt, pc_empty);
1097   __ delayed()->nop();
1098   __ stop("exception pc already set");
1099   __ bind(pc_empty);
1100 #endif
1101 
1102   // save the exception and issuing pc in the thread
1103   __ st_ptr(Oexception,  G2_thread, in_bytes(JavaThread::exception_oop_offset()));
1104   __ st_ptr(Oissuing_pc, G2_thread, in_bytes(JavaThread::exception_pc_offset()));
1105 
1106   // use the throwing pc as the return address to lookup (has bci & oop map)
1107   __ mov(Oissuing_pc, I7);
1108   __ sub(I7, frame::pc_return_offset, I7);
1109   int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
1110   oop_maps->add_gc_map(call_offset, oop_map);
1111 
1112   // Note: if nmethod has been deoptimized then regardless of
1113   // whether it had a handler or not we will deoptimize
1114   // by entering the deopt blob with a pending exception.
1115 
1116   // Restore the registers that were saved at the beginning, remove
1117   // the frame and jump to the exception handler.
1118   switch (id) {
1119   case forward_exception_id:
1120   case handle_exception_id:
1121     restore_live_registers(sasm);
1122     __ jmp(O0, 0);
1123     __ delayed()->restore();
1124     break;
1125   case handle_exception_from_callee_id:
1126     // Restore SP from L7 if the exception PC is a method handle call site.
1127     __ mov(O0, G5);  // Save the target address.
1128     __ lduw(Address(G2_thread, JavaThread::is_method_handle_return_offset()), L0);
1129     __ tst(L0);  // Condition codes are preserved over the restore.
1130     __ restore();
1131 
1132     __ jmp(G5, 0);  // jump to the exception handler
1133     __ delayed()->movcc(Assembler::notZero, false, Assembler::icc, L7_mh_SP_save, SP);  // Restore SP if required.
1134     break;
1135   default:  ShouldNotReachHere();
1136   }
1137 
1138   return oop_maps;
1139 }
1140 
1141 
1142 #undef __
1143 
1144 const char *Runtime1::pd_name_for_address(address entry) {
1145   return "<unknown function>";
1146 }