1 /*
   2  * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 #include "c1/c1_Defs.hpp"
  28 #include "c1/c1_MacroAssembler.hpp"
  29 #include "c1/c1_Runtime1.hpp"
  30 #include "interpreter/interpreter.hpp"
  31 #include "nativeInst_ppc.hpp"
  32 #include "oops/compiledICHolder.hpp"
  33 #include "oops/oop.inline.hpp"
  34 #include "prims/jvmtiExport.hpp"
  35 #include "register_ppc.hpp"
  36 #include "runtime/sharedRuntime.hpp"
  37 #include "runtime/signature.hpp"
  38 #include "runtime/vframeArray.hpp"
  39 #include "utilities/macros.hpp"
  40 #include "vmreg_ppc.inline.hpp"
  41 #if INCLUDE_ALL_GCS
  42 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
  43 #endif
  44 
  45 // Implementation of StubAssembler
  46 
  47 int StubAssembler::call_RT(Register oop_result1, Register metadata_result,
  48                            address entry_point, int number_of_arguments) {
  49   set_num_rt_args(0); // Nothing on stack
  50   assert(!(oop_result1->is_valid() || metadata_result->is_valid()) ||
  51          oop_result1 != metadata_result, "registers must be different");
  52 
  53   // Currently no stack banging. We assume that there are enough
  54   // StackShadowPages (which have been banged in generate_stack_overflow_check)
  55   // for the stub frame and the runtime frames.
  56 
  57   set_last_Java_frame(R1_SP, noreg);
  58 
  59   // ARG1 must hold thread address.
  60   mr(R3_ARG1, R16_thread);
  61 
  62   address return_pc = call_c_with_frame_resize(entry_point, /*No resize, we have a C compatible frame.*/0);
  63 
  64   reset_last_Java_frame();
  65 
  66   // Check for pending exceptions.
  67   {
  68     ld(R0, in_bytes(Thread::pending_exception_offset()), R16_thread);
  69     cmpdi(CCR0, R0, 0);
  70 
  71     // This used to conditionally jump to forward_exception however it is
  72     // possible if we relocate that the branch will not reach. So we must jump
  73     // around so we can always reach.
  74 
  75     Label ok;
  76     beq(CCR0, ok);
  77 
  78     // Make sure that the vm_results are cleared.
  79     if (oop_result1->is_valid() || metadata_result->is_valid()) {
  80       li(R0, 0);
  81       if (oop_result1->is_valid()) {
  82         std(R0, in_bytes(JavaThread::vm_result_offset()), R16_thread);
  83       }
  84       if (metadata_result->is_valid()) {
  85         std(R0, in_bytes(JavaThread::vm_result_2_offset()), R16_thread);
  86       }
  87     }
  88 
  89     if (frame_size() == no_frame_size) {
  90       ShouldNotReachHere(); // We always have a frame size.
  91       //pop_frame(); // pop the stub frame
  92       //ld(R0, _abi(lr), R1_SP);
  93       //mtlr(R0);
  94       //load_const_optimized(R0, StubRoutines::forward_exception_entry());
  95       //mtctr(R0);
  96       //bctr();
  97     } else if (_stub_id == Runtime1::forward_exception_id) {
  98       should_not_reach_here();
  99     } else {
 100       // keep stub frame for next call_RT
 101       //load_const_optimized(R0, Runtime1::entry_for(Runtime1::forward_exception_id));
 102       add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(Runtime1::entry_for(Runtime1::forward_exception_id)));
 103       mtctr(R0);
 104       bctr();
 105     }
 106 
 107     bind(ok);
 108   }
 109 
 110   // Get oop results if there are any and reset the values in the thread.
 111   if (oop_result1->is_valid()) {
 112     get_vm_result(oop_result1);
 113   }
 114   if (metadata_result->is_valid()) {
 115     get_vm_result_2(metadata_result);
 116   }
 117 
 118   return (int)(return_pc - code_section()->start());
 119 }
 120 
 121 
 122 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
 123   mr_if_needed(R4_ARG2, arg1);
 124   return call_RT(oop_result1, metadata_result, entry, 1);
 125 }
 126 
 127 
 128 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
 129   mr_if_needed(R4_ARG2, arg1);
 130   mr_if_needed(R5_ARG3, arg2); assert(arg2 != R4_ARG2, "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   mr_if_needed(R4_ARG2, arg1);
 137   mr_if_needed(R5_ARG3, arg2); assert(arg2 != R4_ARG2, "smashed argument");
 138   mr_if_needed(R6_ARG4, arg3); assert(arg3 != R4_ARG2 && arg3 != R5_ARG3, "smashed argument");
 139   return call_RT(oop_result1, metadata_result, entry, 3);
 140 }
 141 
 142 
 143 // Implementation of Runtime1
 144 
 145 #define __ sasm->
 146 
 147 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
 148 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
 149 static int frame_size_in_bytes = -1;
 150 
 151 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
 152   assert(frame_size_in_bytes > frame::abi_reg_args_size, "init");
 153   sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
 154   int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
 155   OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
 156 
 157   int i;
 158   for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
 159     Register r = as_Register(i);
 160     if (FrameMap::reg_needs_save(r)) {
 161       int sp_offset = cpu_reg_save_offsets[i];
 162       oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset>>2), r->as_VMReg());
 163       oop_map->set_callee_saved(VMRegImpl::stack2reg((sp_offset>>2) + 1), r->as_VMReg()->next());
 164     }
 165   }
 166 
 167   if (save_fpu_registers) {
 168     for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
 169       FloatRegister r = as_FloatRegister(i);
 170       int sp_offset = fpu_reg_save_offsets[i];
 171       oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset>>2), r->as_VMReg());
 172       oop_map->set_callee_saved(VMRegImpl::stack2reg((sp_offset>>2) + 1), r->as_VMReg()->next());
 173     }
 174   }
 175 
 176   return oop_map;
 177 }
 178 
 179 static OopMap* save_live_registers(StubAssembler* sasm, bool save_fpu_registers = true,
 180                                    Register ret_pc = noreg, int stack_preserve = 0) {
 181   if (ret_pc == noreg) {
 182     ret_pc = R0;
 183     __ mflr(ret_pc);
 184   }
 185   __ std(ret_pc, _abi(lr), R1_SP); // C code needs pc in C1 method.
 186   __ push_frame(frame_size_in_bytes + stack_preserve, R0);
 187 
 188   // Record volatile registers as callee-save values in an OopMap so
 189   // their save locations will be propagated to the caller frame's
 190   // RegisterMap during StackFrameStream construction (needed for
 191   // deoptimization; see compiledVFrame::create_stack_value).
 192   // OopMap frame sizes are in c2 stack slot sizes (sizeof(jint)).
 193 
 194   int i;
 195   for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
 196     Register r = as_Register(i);
 197     if (FrameMap::reg_needs_save(r)) {
 198       int sp_offset = cpu_reg_save_offsets[i];
 199       __ std(r, sp_offset + STACK_BIAS, R1_SP);
 200     }
 201   }
 202 
 203   if (save_fpu_registers) {
 204     for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
 205       FloatRegister r = as_FloatRegister(i);
 206       int sp_offset = fpu_reg_save_offsets[i];
 207       __ stfd(r, sp_offset + STACK_BIAS, R1_SP);
 208     }
 209   }
 210 
 211   return generate_oop_map(sasm, save_fpu_registers);
 212 }
 213 
 214 static void restore_live_registers(StubAssembler* sasm, Register result1, Register result2,
 215                                    bool restore_fpu_registers = true) {
 216   for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
 217     Register r = as_Register(i);
 218     if (FrameMap::reg_needs_save(r) && r != result1 && r != result2) {
 219       int sp_offset = cpu_reg_save_offsets[i];
 220       __ ld(r, sp_offset + STACK_BIAS, R1_SP);
 221     }
 222   }
 223 
 224   if (restore_fpu_registers) {
 225     for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
 226       FloatRegister r = as_FloatRegister(i);
 227       int sp_offset = fpu_reg_save_offsets[i];
 228       __ lfd(r, sp_offset + STACK_BIAS, R1_SP);
 229     }
 230   }
 231 
 232   __ pop_frame();
 233   __ ld(R0, _abi(lr), R1_SP);
 234   __ mtlr(R0);
 235 }
 236 
 237 
 238 void Runtime1::initialize_pd() {
 239   int i;
 240   int sp_offset = frame::abi_reg_args_size;
 241 
 242   for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
 243     Register r = as_Register(i);
 244     if (FrameMap::reg_needs_save(r)) {
 245       cpu_reg_save_offsets[i] = sp_offset;
 246       sp_offset += BytesPerWord;
 247     }
 248   }
 249 
 250   for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
 251     fpu_reg_save_offsets[i] = sp_offset;
 252     sp_offset += BytesPerWord;
 253   }
 254   frame_size_in_bytes = align_size_up(sp_offset, frame::alignment_in_bytes);
 255 }
 256 
 257 
 258 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
 259   // Make a frame and preserve the caller's caller-save registers.
 260   OopMap* oop_map = save_live_registers(sasm);
 261 
 262   int call_offset;
 263   if (!has_argument) {
 264     call_offset = __ call_RT(noreg, noreg, target);
 265   } else {
 266     call_offset = __ call_RT(noreg, noreg, target, R4_ARG2);
 267   }
 268   OopMapSet* oop_maps = new OopMapSet();
 269   oop_maps->add_gc_map(call_offset, oop_map);
 270 
 271   __ should_not_reach_here();
 272   return oop_maps;
 273 }
 274 
 275 static OopMapSet* generate_exception_throw_with_stack_parms(StubAssembler* sasm, address target,
 276                                                             int stack_parms) {
 277   // Make a frame and preserve the caller's caller-save registers.
 278   const int parm_size_in_bytes = align_size_up(stack_parms << LogBytesPerWord, frame::alignment_in_bytes);
 279   const int padding = parm_size_in_bytes - (stack_parms << LogBytesPerWord);
 280   OopMap* oop_map = save_live_registers(sasm, true, noreg, parm_size_in_bytes);
 281 
 282   int call_offset = 0;
 283   switch (stack_parms) {
 284     case 3:
 285     __ ld(R6_ARG4, frame_size_in_bytes + padding + 16, R1_SP);
 286     case 2:
 287     __ ld(R5_ARG3, frame_size_in_bytes + padding + 8, R1_SP);
 288     case 1:
 289     __ ld(R4_ARG2, frame_size_in_bytes + padding + 0, R1_SP);
 290     call_offset = __ call_RT(noreg, noreg, target);
 291     break;
 292     default: Unimplemented(); break;
 293   }
 294   OopMapSet* oop_maps = new OopMapSet();
 295   oop_maps->add_gc_map(call_offset, oop_map);
 296 
 297   __ should_not_reach_here();
 298   return oop_maps;
 299 }
 300 
 301 
 302 OopMapSet* Runtime1::generate_stub_call(StubAssembler* sasm, Register result, address target,
 303                                         Register arg1, Register arg2, Register arg3) {
 304   // Make a frame and preserve the caller's caller-save registers.
 305   OopMap* oop_map = save_live_registers(sasm);
 306 
 307   int call_offset;
 308   if (arg1 == noreg) {
 309     call_offset = __ call_RT(result, noreg, target);
 310   } else if (arg2 == noreg) {
 311     call_offset = __ call_RT(result, noreg, target, arg1);
 312   } else if (arg3 == noreg) {
 313     call_offset = __ call_RT(result, noreg, target, arg1, arg2);
 314   } else {
 315     call_offset = __ call_RT(result, noreg, target, arg1, arg2, arg3);
 316   }
 317   OopMapSet* oop_maps = new OopMapSet();
 318   oop_maps->add_gc_map(call_offset, oop_map);
 319 
 320   restore_live_registers(sasm, result, noreg);
 321   __ blr();
 322   return oop_maps;
 323 }
 324 
 325 static OopMapSet* stub_call_with_stack_parms(StubAssembler* sasm, Register result, address target,
 326                                              int stack_parms, bool do_return = true) {
 327   // Make a frame and preserve the caller's caller-save registers.
 328   const int parm_size_in_bytes = align_size_up(stack_parms << LogBytesPerWord, frame::alignment_in_bytes);
 329   const int padding = parm_size_in_bytes - (stack_parms << LogBytesPerWord);
 330   OopMap* oop_map = save_live_registers(sasm, true, noreg, parm_size_in_bytes);
 331 
 332   int call_offset = 0;
 333   switch (stack_parms) {
 334     case 3:
 335     __ ld(R6_ARG4, frame_size_in_bytes + padding + 16, R1_SP);
 336     case 2:
 337     __ ld(R5_ARG3, frame_size_in_bytes + padding + 8, R1_SP);
 338     case 1:
 339     __ ld(R4_ARG2, frame_size_in_bytes + padding + 0, R1_SP);
 340     call_offset = __ call_RT(result, noreg, target);
 341     break;
 342     default: Unimplemented(); break;
 343   }
 344   OopMapSet* oop_maps = new OopMapSet();
 345   oop_maps->add_gc_map(call_offset, oop_map);
 346 
 347   restore_live_registers(sasm, result, noreg);
 348   if (do_return) __ blr();
 349   return oop_maps;
 350 }
 351 
 352 
 353 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
 354   // Make a frame and preserve the caller's caller-save registers.
 355   OopMap* oop_map = save_live_registers(sasm);
 356 
 357   // Call the runtime patching routine, returns non-zero if nmethod got deopted.
 358   int call_offset = __ call_RT(noreg, noreg, target);
 359   OopMapSet* oop_maps = new OopMapSet();
 360   oop_maps->add_gc_map(call_offset, oop_map);
 361   __ cmpdi(CCR0, R3_RET, 0);
 362 
 363   // Re-execute the patched instruction or, if the nmethod was deoptmized,
 364   // return to the deoptimization handler entry that will cause re-execution
 365   // of the current bytecode.
 366   DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
 367   assert(deopt_blob != NULL, "deoptimization blob must have been created");
 368 
 369   // Return to the deoptimization handler entry for unpacking and rexecute.
 370   // If we simply returned the we'd deopt as if any call we patched had just
 371   // returned.
 372 
 373   restore_live_registers(sasm, noreg, noreg);
 374   // Return if patching routine returned 0.
 375   __ bclr(Assembler::bcondCRbiIs1, Assembler::bi0(CCR0, Assembler::equal), Assembler::bhintbhBCLRisReturn);
 376 
 377   address stub = deopt_blob->unpack_with_reexecution();
 378   //__ load_const_optimized(R0, stub);
 379   __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
 380   __ mtctr(R0);
 381   __ bctr();
 382 
 383   return oop_maps;
 384 }
 385 
 386 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
 387   OopMapSet* oop_maps = NULL;
 388 
 389   // For better readability.
 390   const bool must_gc_arguments = true;
 391   const bool dont_gc_arguments = false;
 392 
 393   // Stub code & info for the different stubs.
 394   switch (id) {
 395     case forward_exception_id:
 396       {
 397         oop_maps = generate_handle_exception(id, sasm);
 398       }
 399       break;
 400 
 401     case new_instance_id:
 402     case fast_new_instance_id:
 403     case fast_new_instance_init_check_id:
 404       {
 405         if (id == new_instance_id) {
 406           __ set_info("new_instance", dont_gc_arguments);
 407         } else if (id == fast_new_instance_id) {
 408           __ set_info("fast new_instance", dont_gc_arguments);
 409         } else {
 410           assert(id == fast_new_instance_init_check_id, "bad StubID");
 411           __ set_info("fast new_instance init check", dont_gc_arguments);
 412         }
 413         // We don't support eden allocation.
 414 //        if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
 415 //            UseTLAB && FastTLABRefill) {
 416 //          if (id == fast_new_instance_init_check_id) {
 417 //            // make sure the klass is initialized
 418 //            __ lbz(R0, in_bytes(InstanceKlass::init_state_offset()), R3_ARG1);
 419 //            __ cmpwi(CCR0, R0, InstanceKlass::fully_initialized);
 420 //            __ bne(CCR0, slow_path);
 421 //          }
 422 //#ifdef ASSERT
 423 //          // assert object can be fast path allocated
 424 //          {
 425 //            Label ok, not_ok;
 426 //          __ lwz(R0, in_bytes(Klass::layout_helper_offset()), R3_ARG1);
 427 //          // make sure it's an instance (LH > 0)
 428 //          __ cmpwi(CCR0, R0, 0);
 429 //          __ ble(CCR0, not_ok);
 430 //          __ testbitdi(CCR0, R0, R0, Klass::_lh_instance_slow_path_bit);
 431 //          __ beq(CCR0, ok);
 432 //
 433 //          __ bind(not_ok);
 434 //          __ stop("assert(can be fast path allocated)");
 435 //          __ bind(ok);
 436 //          }
 437 //#endif // ASSERT
 438 //          // We don't support eden allocation.
 439 //          __ bind(slow_path);
 440 //        }
 441         oop_maps = generate_stub_call(sasm, R3_RET, CAST_FROM_FN_PTR(address, new_instance), R4_ARG2);
 442       }
 443       break;
 444 
 445     case counter_overflow_id:
 446         // Bci and method are on stack.
 447         oop_maps = stub_call_with_stack_parms(sasm, noreg, CAST_FROM_FN_PTR(address, counter_overflow), 2);
 448       break;
 449 
 450     case new_type_array_id:
 451     case new_object_array_id:
 452       {
 453         if (id == new_type_array_id) {
 454           __ set_info("new_type_array", dont_gc_arguments);
 455         } else {
 456           __ set_info("new_object_array", dont_gc_arguments);
 457         }
 458 
 459 #ifdef ASSERT
 460         // Assert object type is really an array of the proper kind.
 461         {
 462           int tag = (id == new_type_array_id) ? Klass::_lh_array_tag_type_value : Klass::_lh_array_tag_obj_value;
 463           Label ok;
 464           __ lwz(R0, in_bytes(Klass::layout_helper_offset()), R4_ARG2);
 465           __ srawi(R0, R0, Klass::_lh_array_tag_shift);
 466           __ cmpwi(CCR0, R0, tag);
 467           __ beq(CCR0, ok);
 468           __ stop("assert(is an array klass)");
 469           __ should_not_reach_here();
 470           __ bind(ok);
 471         }
 472 #endif // ASSERT
 473 
 474         // We don't support eden allocation.
 475 
 476         if (id == new_type_array_id) {
 477           oop_maps = generate_stub_call(sasm, R3_RET, CAST_FROM_FN_PTR(address, new_type_array), R4_ARG2, R5_ARG3);
 478         } else {
 479           oop_maps = generate_stub_call(sasm, R3_RET, CAST_FROM_FN_PTR(address, new_object_array), R4_ARG2, R5_ARG3);
 480         }
 481       }
 482       break;
 483 
 484     case new_multi_array_id:
 485       {
 486         // R4: klass
 487         // R5: rank
 488         // R6: address of 1st dimension
 489         __ set_info("new_multi_array", dont_gc_arguments);
 490         oop_maps = generate_stub_call(sasm, R3_RET, CAST_FROM_FN_PTR(address, new_multi_array), R4_ARG2, R5_ARG3, R6_ARG4);
 491       }
 492       break;
 493 
 494     case register_finalizer_id:
 495       {
 496         __ set_info("register_finalizer", dont_gc_arguments);
 497         // This code is called via rt_call. Hence, caller-save registers have been saved.
 498         Register t = R11_scratch1;
 499 
 500         // Load the klass and check the has finalizer flag.
 501         __ load_klass(t, R3_ARG1);
 502         __ lwz(t, in_bytes(Klass::access_flags_offset()), t);
 503         __ testbitdi(CCR0, R0, t, exact_log2(JVM_ACC_HAS_FINALIZER));
 504         // Return if has_finalizer bit == 0 (CR0.eq).
 505         __ bclr(Assembler::bcondCRbiIs1, Assembler::bi0(CCR0, Assembler::equal), Assembler::bhintbhBCLRisReturn);
 506 
 507         __ mflr(R0);
 508         __ std(R0, _abi(lr), R1_SP);
 509         __ push_frame(frame::abi_reg_args_size, R0); // Empty dummy frame (no callee-save regs).
 510         sasm->set_frame_size(frame::abi_reg_args_size / BytesPerWord);
 511         OopMap* oop_map = new OopMap(frame::abi_reg_args_size / sizeof(jint), 0);
 512         int call_offset = __ call_RT(noreg, noreg,
 513                                      CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), R3_ARG1);
 514         oop_maps = new OopMapSet();
 515         oop_maps->add_gc_map(call_offset, oop_map);
 516 
 517         __ pop_frame();
 518         __ ld(R0, _abi(lr), R1_SP);
 519         __ mtlr(R0);
 520         __ blr();
 521       }
 522       break;
 523 
 524     case throw_range_check_failed_id:
 525       {
 526         __ set_info("range_check_failed", dont_gc_arguments); // Arguments will be discarded.
 527         __ std(R0, -8, R1_SP); // Pass index on stack.
 528         oop_maps = generate_exception_throw_with_stack_parms(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), 1);
 529       }
 530       break;
 531 
 532     case throw_index_exception_id:
 533       {
 534         __ set_info("index_range_check_failed", dont_gc_arguments); // Arguments will be discarded.
 535         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
 536       }
 537       break;
 538 
 539     case throw_div0_exception_id:
 540       {
 541         __ set_info("throw_div0_exception", dont_gc_arguments);
 542         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
 543       }
 544       break;
 545 
 546     case throw_null_pointer_exception_id:
 547       {
 548         __ set_info("throw_null_pointer_exception", dont_gc_arguments);
 549         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
 550       }
 551       break;
 552 
 553     case handle_exception_nofpu_id:
 554     case handle_exception_id:
 555       {
 556         __ set_info("handle_exception", dont_gc_arguments);
 557         oop_maps = generate_handle_exception(id, sasm);
 558       }
 559       break;
 560 
 561     case handle_exception_from_callee_id:
 562       {
 563         __ set_info("handle_exception_from_callee", dont_gc_arguments);
 564         oop_maps = generate_handle_exception(id, sasm);
 565       }
 566       break;
 567 
 568     case unwind_exception_id:
 569       {
 570         const Register Rexception    = R3 /*LIRGenerator::exceptionOopOpr()*/,
 571                        Rexception_pc = R4 /*LIRGenerator::exceptionPcOpr()*/,
 572                        Rexception_save = R31, Rcaller_sp = R30;
 573         __ set_info("unwind_exception", dont_gc_arguments);
 574 
 575         __ ld(Rcaller_sp, 0, R1_SP);
 576         __ push_frame_reg_args(0, R0); // dummy frame for C call
 577         __ mr(Rexception_save, Rexception); // save over C call
 578         __ ld(Rexception_pc, _abi(lr), Rcaller_sp); // return pc
 579         __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), R16_thread, Rexception_pc);
 580         __ verify_not_null_oop(Rexception_save);
 581         __ mtctr(R3_RET);
 582         __ ld(Rexception_pc, _abi(lr), Rcaller_sp); // return pc
 583         __ mr(R1_SP, Rcaller_sp); // Pop both frames at once.
 584         __ mr(Rexception, Rexception_save); // restore
 585         __ mtlr(Rexception_pc);
 586         __ bctr();
 587       }
 588       break;
 589 
 590     case throw_array_store_exception_id:
 591       {
 592         __ set_info("throw_array_store_exception", dont_gc_arguments);
 593         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
 594       }
 595       break;
 596 
 597     case throw_class_cast_exception_id:
 598       {
 599         __ set_info("throw_class_cast_exception", dont_gc_arguments);
 600         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
 601       }
 602       break;
 603 
 604     case throw_incompatible_class_change_error_id:
 605       {
 606         __ set_info("throw_incompatible_class_cast_exception", dont_gc_arguments);
 607         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
 608       }
 609       break;
 610 
 611     case slow_subtype_check_id:
 612       { // Support for uint StubRoutine::partial_subtype_check( Klass sub, Klass super );
 613         const Register sub_klass = R5,
 614                        super_klass = R4,
 615                        temp1_reg = R6,
 616                        temp2_reg = R0;
 617         __ check_klass_subtype_slow_path(sub_klass, super_klass, temp1_reg, temp2_reg); // returns with CR0.eq if successful
 618         __ crandc(CCR0, Assembler::equal, CCR0, Assembler::equal); // failed: CR0.ne
 619         __ blr();
 620       }
 621       break;
 622 
 623     case monitorenter_nofpu_id:
 624     case monitorenter_id:
 625       {
 626         __ set_info("monitorenter", dont_gc_arguments);
 627 
 628         int save_fpu_registers = (id == monitorenter_id);
 629         // Make a frame and preserve the caller's caller-save registers.
 630         OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
 631 
 632         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), R4_ARG2, R5_ARG3);
 633 
 634         oop_maps = new OopMapSet();
 635         oop_maps->add_gc_map(call_offset, oop_map);
 636 
 637         restore_live_registers(sasm, noreg, noreg, save_fpu_registers);
 638         __ blr();
 639       }
 640       break;
 641 
 642     case monitorexit_nofpu_id:
 643     case monitorexit_id:
 644       {
 645         // note: Really a leaf routine but must setup last java sp
 646         //       => use call_RT for now (speed can be improved by
 647         //       doing last java sp setup manually).
 648         __ set_info("monitorexit", dont_gc_arguments);
 649 
 650         int save_fpu_registers = (id == monitorexit_id);
 651         // Make a frame and preserve the caller's caller-save registers.
 652         OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
 653 
 654         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), R4_ARG2);
 655 
 656         oop_maps = new OopMapSet();
 657         oop_maps->add_gc_map(call_offset, oop_map);
 658 
 659         restore_live_registers(sasm, noreg, noreg, save_fpu_registers);
 660         __ blr();
 661       }
 662       break;
 663 
 664     case deoptimize_id:
 665       {
 666         __ set_info("deoptimize", dont_gc_arguments);
 667         __ std(R0, -8, R1_SP); // Pass trap_request on stack.
 668         oop_maps = stub_call_with_stack_parms(sasm, noreg, CAST_FROM_FN_PTR(address, deoptimize), 1, /*do_return*/ false);
 669 
 670         DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
 671         assert(deopt_blob != NULL, "deoptimization blob must have been created");
 672         address stub = deopt_blob->unpack_with_reexecution();
 673         //__ load_const_optimized(R0, stub);
 674         __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
 675         __ mtctr(R0);
 676         __ bctr();
 677       }
 678       break;
 679 
 680     case access_field_patching_id:
 681       {
 682         __ set_info("access_field_patching", dont_gc_arguments);
 683         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
 684       }
 685       break;
 686 
 687     case load_klass_patching_id:
 688       {
 689         __ set_info("load_klass_patching", dont_gc_arguments);
 690         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
 691       }
 692       break;
 693 
 694     case load_mirror_patching_id:
 695       {
 696         __ set_info("load_mirror_patching", dont_gc_arguments);
 697         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
 698       }
 699       break;
 700 
 701     case load_appendix_patching_id:
 702       {
 703         __ set_info("load_appendix_patching", dont_gc_arguments);
 704         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
 705       }
 706       break;
 707 
 708     case dtrace_object_alloc_id:
 709       { // O0: object
 710         __ unimplemented("stub dtrace_object_alloc_id");
 711         __ set_info("dtrace_object_alloc", dont_gc_arguments);
 712 //        // We can't gc here so skip the oopmap but make sure that all
 713 //        // the live registers get saved.
 714 //        save_live_registers(sasm);
 715 //
 716 //        __ save_thread(L7_thread_cache);
 717 //        __ call(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc),
 718 //                relocInfo::runtime_call_type);
 719 //        __ delayed()->mov(I0, O0);
 720 //        __ restore_thread(L7_thread_cache);
 721 //
 722 //        restore_live_registers(sasm);
 723 //        __ ret();
 724 //        __ delayed()->restore();
 725       }
 726       break;
 727 
 728 #if INCLUDE_ALL_GCS
 729     case g1_pre_barrier_slow_id:
 730       {
 731         BarrierSet* bs = Universe::heap()->barrier_set();
 732         if (bs->kind() != BarrierSet::G1SATBCTLogging) {
 733           goto unimplemented_entry;
 734         }
 735 
 736         __ set_info("g1_pre_barrier_slow_id", dont_gc_arguments);
 737 
 738         // Using stack slots: pre_val (pre-pushed), spill tmp, spill tmp2.
 739         const int stack_slots = 3;
 740         Register pre_val = R0; // previous value of memory
 741         Register tmp  = R14;
 742         Register tmp2 = R15;
 743 
 744         Label refill, restart, marking_not_active;
 745         int satb_q_active_byte_offset =
 746           in_bytes(JavaThread::satb_mark_queue_offset() +
 747                    SATBMarkQueue::byte_offset_of_active());
 748         int satb_q_index_byte_offset =
 749           in_bytes(JavaThread::satb_mark_queue_offset() +
 750                    SATBMarkQueue::byte_offset_of_index());
 751         int satb_q_buf_byte_offset =
 752           in_bytes(JavaThread::satb_mark_queue_offset() +
 753                    SATBMarkQueue::byte_offset_of_buf());
 754 
 755         // Spill
 756         __ std(tmp, -16, R1_SP);
 757         __ std(tmp2, -24, R1_SP);
 758 
 759         // Is marking still active?
 760         if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
 761           __ lwz(tmp, satb_q_active_byte_offset, R16_thread);
 762         } else {
 763           assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
 764           __ lbz(tmp, satb_q_active_byte_offset, R16_thread);
 765         }
 766         __ cmpdi(CCR0, tmp, 0);
 767         __ beq(CCR0, marking_not_active);
 768 
 769         __ bind(restart);
 770         // Load the index into the SATB buffer. SATBMarkQueue::_index is a
 771         // size_t so ld_ptr is appropriate.
 772         __ ld(tmp, satb_q_index_byte_offset, R16_thread);
 773 
 774         // index == 0?
 775         __ cmpdi(CCR0, tmp, 0);
 776         __ beq(CCR0, refill);
 777 
 778         __ ld(tmp2, satb_q_buf_byte_offset, R16_thread);
 779         __ ld(pre_val, -8, R1_SP); // Load from stack.
 780         __ addi(tmp, tmp, -oopSize);
 781 
 782         __ std(tmp, satb_q_index_byte_offset, R16_thread);
 783         __ stdx(pre_val, tmp2, tmp); // [_buf + index] := <address_of_card>
 784 
 785         __ bind(marking_not_active);
 786         // Restore temp registers and return-from-leaf.
 787         __ ld(tmp2, -24, R1_SP);
 788         __ ld(tmp, -16, R1_SP);
 789         __ blr();
 790 
 791         __ bind(refill);
 792         const int nbytes_save = (MacroAssembler::num_volatile_regs + stack_slots) * BytesPerWord;
 793         __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
 794         __ mflr(R0);
 795         __ std(R0, _abi(lr), R1_SP);
 796         __ push_frame_reg_args(nbytes_save, R0); // dummy frame for C call
 797         __ call_VM_leaf(CAST_FROM_FN_PTR(address, SATBMarkQueueSet::handle_zero_index_for_thread), R16_thread);
 798         __ pop_frame();
 799         __ ld(R0, _abi(lr), R1_SP);
 800         __ mtlr(R0);
 801         __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
 802         __ b(restart);
 803       }
 804       break;
 805 
 806   case g1_post_barrier_slow_id:
 807     {
 808         BarrierSet* bs = Universe::heap()->barrier_set();
 809         if (bs->kind() != BarrierSet::G1SATBCTLogging) {
 810           goto unimplemented_entry;
 811         }
 812 
 813         __ set_info("g1_post_barrier_slow_id", dont_gc_arguments);
 814 
 815         // Using stack slots: spill addr, spill tmp2
 816         const int stack_slots = 2;
 817         Register tmp = R0;
 818         Register addr = R14;
 819         Register tmp2 = R15;
 820         jbyte* byte_map_base = ((CardTableModRefBS*)bs)->byte_map_base;
 821 
 822         Label restart, refill, ret;
 823 
 824         // Spill
 825         __ std(addr, -8, R1_SP);
 826         __ std(tmp2, -16, R1_SP);
 827 
 828         __ srdi(addr, R0, CardTableModRefBS::card_shift); // Addr is passed in R0.
 829         __ load_const_optimized(/*cardtable*/ tmp2, byte_map_base, tmp);
 830         __ add(addr, tmp2, addr);
 831         __ lbz(tmp, 0, addr); // tmp := [addr + cardtable]
 832 
 833         // Return if young card.
 834         __ cmpwi(CCR0, tmp, G1SATBCardTableModRefBS::g1_young_card_val());
 835         __ beq(CCR0, ret);
 836 
 837         // Return if sequential consistent value is already dirty.
 838         __ membar(Assembler::StoreLoad);
 839         __ lbz(tmp, 0, addr); // tmp := [addr + cardtable]
 840 
 841         __ cmpwi(CCR0, tmp, G1SATBCardTableModRefBS::dirty_card_val());
 842         __ beq(CCR0, ret);
 843 
 844         // Not dirty.
 845 
 846         // First, dirty it.
 847         __ li(tmp, G1SATBCardTableModRefBS::dirty_card_val());
 848         __ stb(tmp, 0, addr);
 849 
 850         int dirty_card_q_index_byte_offset =
 851           in_bytes(JavaThread::dirty_card_queue_offset() +
 852                    DirtyCardQueue::byte_offset_of_index());
 853         int dirty_card_q_buf_byte_offset =
 854           in_bytes(JavaThread::dirty_card_queue_offset() +
 855                    DirtyCardQueue::byte_offset_of_buf());
 856 
 857         __ bind(restart);
 858 
 859         // Get the index into the update buffer. DirtyCardQueue::_index is
 860         // a size_t so ld_ptr is appropriate here.
 861         __ ld(tmp2, dirty_card_q_index_byte_offset, R16_thread);
 862 
 863         // index == 0?
 864         __ cmpdi(CCR0, tmp2, 0);
 865         __ beq(CCR0, refill);
 866 
 867         __ ld(tmp, dirty_card_q_buf_byte_offset, R16_thread);
 868         __ addi(tmp2, tmp2, -oopSize);
 869 
 870         __ std(tmp2, dirty_card_q_index_byte_offset, R16_thread);
 871         __ add(tmp2, tmp, tmp2);
 872         __ std(addr, 0, tmp2); // [_buf + index] := <address_of_card>
 873 
 874         // Restore temp registers and return-from-leaf.
 875         __ bind(ret);
 876         __ ld(tmp2, -16, R1_SP);
 877         __ ld(addr, -8, R1_SP);
 878         __ blr();
 879 
 880         __ bind(refill);
 881         const int nbytes_save = (MacroAssembler::num_volatile_regs + stack_slots) * BytesPerWord;
 882         __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
 883         __ mflr(R0);
 884         __ std(R0, _abi(lr), R1_SP);
 885         __ push_frame_reg_args(nbytes_save, R0); // dummy frame for C call
 886         __ call_VM_leaf(CAST_FROM_FN_PTR(address, DirtyCardQueueSet::handle_zero_index_for_thread), R16_thread);
 887         __ pop_frame();
 888         __ ld(R0, _abi(lr), R1_SP);
 889         __ mtlr(R0);
 890         __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
 891         __ b(restart);
 892       }
 893       break;
 894 #endif // INCLUDE_ALL_GCS
 895 
 896     case predicate_failed_trap_id:
 897       {
 898         __ set_info("predicate_failed_trap", dont_gc_arguments);
 899         OopMap* oop_map = save_live_registers(sasm);
 900 
 901         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
 902 
 903         oop_maps = new OopMapSet();
 904         oop_maps->add_gc_map(call_offset, oop_map);
 905 
 906         DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
 907         assert(deopt_blob != NULL, "deoptimization blob must have been created");
 908         restore_live_registers(sasm, noreg, noreg);
 909 
 910         address stub = deopt_blob->unpack_with_reexecution();
 911         //__ load_const_optimized(R0, stub);
 912         __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
 913         __ mtctr(R0);
 914         __ bctr();
 915       }
 916       break;
 917 
 918   default:
 919   unimplemented_entry:
 920       {
 921         __ set_info("unimplemented entry", dont_gc_arguments);
 922         __ mflr(R0);
 923         __ std(R0, _abi(lr), R1_SP);
 924         __ push_frame(frame::abi_reg_args_size, R0); // empty dummy frame
 925         sasm->set_frame_size(frame::abi_reg_args_size / BytesPerWord);
 926         OopMap* oop_map = new OopMap(frame::abi_reg_args_size / sizeof(jint), 0);
 927 
 928         __ load_const_optimized(R4_ARG2, (int)id);
 929         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), R4_ARG2);
 930 
 931         oop_maps = new OopMapSet();
 932         oop_maps->add_gc_map(call_offset, oop_map);
 933         __ should_not_reach_here();
 934       }
 935       break;
 936   }
 937   return oop_maps;
 938 }
 939 
 940 
 941 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler* sasm) {
 942   __ block_comment("generate_handle_exception");
 943 
 944   // Save registers, if required.
 945   OopMapSet* oop_maps = new OopMapSet();
 946   OopMap* oop_map = NULL;
 947   const Register Rexception    = R3 /*LIRGenerator::exceptionOopOpr()*/,
 948                  Rexception_pc = R4 /*LIRGenerator::exceptionPcOpr()*/;
 949 
 950   switch (id) {
 951   case forward_exception_id:
 952     // We're handling an exception in the context of a compiled frame.
 953     // The registers have been saved in the standard places. Perform
 954     // an exception lookup in the caller and dispatch to the handler
 955     // if found. Otherwise unwind and dispatch to the callers
 956     // exception handler.
 957     oop_map = generate_oop_map(sasm, true);
 958     // Transfer the pending exception to the exception_oop.
 959     // Also load the PC which is typically at SP + frame_size_in_bytes + _abi(lr),
 960     // but we support additional slots in the frame for parameter passing.
 961     __ ld(Rexception_pc, 0, R1_SP);
 962     __ ld(Rexception, in_bytes(JavaThread::pending_exception_offset()), R16_thread);
 963     __ li(R0, 0);
 964     __ ld(Rexception_pc, _abi(lr), Rexception_pc);
 965     __ std(R0, in_bytes(JavaThread::pending_exception_offset()), R16_thread);
 966     break;
 967   case handle_exception_nofpu_id:
 968   case handle_exception_id:
 969     // At this point all registers MAY be live.
 970     oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id, Rexception_pc);
 971     break;
 972   case handle_exception_from_callee_id:
 973     // At this point all registers except exception oop and exception pc are dead.
 974     oop_map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
 975     sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
 976     __ std(Rexception_pc, _abi(lr), R1_SP);
 977     __ push_frame(frame_size_in_bytes, R0);
 978     break;
 979   default:  ShouldNotReachHere();
 980   }
 981 
 982   __ verify_not_null_oop(Rexception);
 983 
 984 #ifdef ASSERT
 985   // Check that fields in JavaThread for exception oop and issuing pc are
 986   // empty before writing to them.
 987   __ ld(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
 988   __ cmpdi(CCR0, R0, 0);
 989   __ asm_assert_eq("exception oop already set", 0x963);
 990   __ ld(R0, in_bytes(JavaThread::exception_pc_offset() ), R16_thread);
 991   __ cmpdi(CCR0, R0, 0);
 992   __ asm_assert_eq("exception pc already set", 0x962);
 993 #endif
 994 
 995   // Save the exception and issuing pc in the thread.
 996   __ std(Rexception,    in_bytes(JavaThread::exception_oop_offset()), R16_thread);
 997   __ std(Rexception_pc, in_bytes(JavaThread::exception_pc_offset() ), R16_thread);
 998 
 999   int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
1000   oop_maps->add_gc_map(call_offset, oop_map);
1001 
1002   __ mtctr(R3_RET);
1003 
1004   // Note: if nmethod has been deoptimized then regardless of
1005   // whether it had a handler or not we will deoptimize
1006   // by entering the deopt blob with a pending exception.
1007 
1008   // Restore the registers that were saved at the beginning, remove
1009   // the frame and jump to the exception handler.
1010   switch (id) {
1011   case forward_exception_id:
1012   case handle_exception_nofpu_id:
1013   case handle_exception_id:
1014     restore_live_registers(sasm, noreg, noreg, id != handle_exception_nofpu_id);
1015     __ bctr();
1016     break;
1017   case handle_exception_from_callee_id: {
1018     __ pop_frame();
1019     __ ld(Rexception_pc, _abi(lr), R1_SP);
1020     __ mtlr(Rexception_pc);
1021     __ bctr();
1022     break;
1023   }
1024   default:  ShouldNotReachHere();
1025   }
1026 
1027   return oop_maps;
1028 }
1029 
1030 const char *Runtime1::pd_name_for_address(address entry) {
1031   return "<unknown function>";
1032 }
1033 
1034 #undef __