1 /*
   2  * Copyright (c) 1999, 2025, 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 "asm/assembler.hpp"
  26 #include "c1/c1_Defs.hpp"
  27 #include "c1/c1_FrameMap.hpp"
  28 #include "c1/c1_MacroAssembler.hpp"
  29 #include "c1/c1_Runtime1.hpp"
  30 #include "ci/ciUtilities.hpp"
  31 #include "compiler/compilerDefinitions.inline.hpp"
  32 #include "compiler/oopMap.hpp"
  33 #include "gc/shared/cardTable.hpp"
  34 #include "gc/shared/cardTableBarrierSet.hpp"
  35 #include "gc/shared/collectedHeap.hpp"
  36 #include "gc/shared/tlab_globals.hpp"
  37 #include "interpreter/interpreter.hpp"
  38 #include "memory/universe.hpp"
  39 #include "nativeInst_x86.hpp"
  40 #include "oops/oop.inline.hpp"
  41 #include "prims/jvmtiExport.hpp"
  42 #include "register_x86.hpp"
  43 #include "runtime/sharedRuntime.hpp"
  44 #include "runtime/signature.hpp"
  45 #include "runtime/stubRoutines.hpp"
  46 #include "runtime/vframeArray.hpp"
  47 #include "utilities/macros.hpp"
  48 #include "vmreg_x86.inline.hpp"
  49 
  50 // Implementation of StubAssembler
  51 
  52 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) {
  53   // setup registers
  54   const Register thread = r15_thread;
  55   assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
  56   assert(oop_result1 != thread && metadata_result != thread, "registers must be different");
  57   assert(args_size >= 0, "illegal args_size");
  58   bool align_stack = false;
  59 
  60   // At a method handle call, the stack may not be properly aligned
  61   // when returning with an exception.
  62   align_stack = (stub_id() == (int)C1StubId::handle_exception_from_callee_id);
  63 
  64   mov(c_rarg0, thread);
  65   set_num_rt_args(0); // Nothing on stack
  66 
  67   int call_offset = -1;
  68   if (!align_stack) {
  69     set_last_Java_frame(noreg, rbp, nullptr, rscratch1);
  70   } else {
  71     address the_pc = pc();
  72     call_offset = offset();
  73     set_last_Java_frame(noreg, rbp, the_pc, rscratch1);
  74     andptr(rsp, -(StackAlignmentInBytes));    // Align stack
  75   }
  76 
  77   // do the call
  78   call(RuntimeAddress(entry));
  79   if (!align_stack) {
  80     call_offset = offset();
  81   }
  82   // verify callee-saved register
  83 #ifdef ASSERT
  84   guarantee(thread != rax, "change this code");
  85   push(rax);
  86   { Label L;
  87     get_thread_slow(rax);
  88     cmpptr(thread, rax);
  89     jcc(Assembler::equal, L);
  90     int3();
  91     stop("StubAssembler::call_RT: rdi not callee saved?");
  92     bind(L);
  93   }
  94   pop(rax);
  95 #endif
  96   reset_last_Java_frame(true);
  97 
  98   // check for pending exceptions
  99   { Label L;
 100     cmpptr(Address(thread, Thread::pending_exception_offset()), NULL_WORD);
 101     jcc(Assembler::equal, L);
 102     // exception pending => remove activation and forward to exception handler
 103     movptr(rax, Address(thread, Thread::pending_exception_offset()));
 104     // make sure that the vm_results are cleared
 105     if (oop_result1->is_valid()) {
 106       movptr(Address(thread, JavaThread::vm_result_oop_offset()), NULL_WORD);
 107     }
 108     if (metadata_result->is_valid()) {
 109       movptr(Address(thread, JavaThread::vm_result_metadata_offset()), NULL_WORD);
 110     }
 111     if (frame_size() == no_frame_size) {
 112       leave();
 113       jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
 114     } else if (_stub_id == (int)C1StubId::forward_exception_id) {
 115       should_not_reach_here();
 116     } else {
 117       jump(RuntimeAddress(Runtime1::entry_for(C1StubId::forward_exception_id)));
 118     }
 119     bind(L);
 120   }
 121   // get oop results if there are any and reset the values in the thread
 122   if (oop_result1->is_valid()) {
 123     get_vm_result_oop(oop_result1);
 124   }
 125   if (metadata_result->is_valid()) {
 126     get_vm_result_metadata(metadata_result);
 127   }
 128 
 129   assert(call_offset >= 0, "Should be set");
 130   return call_offset;
 131 }
 132 
 133 
 134 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
 135   mov(c_rarg1, arg1);
 136   return call_RT(oop_result1, metadata_result, entry, 1);
 137 }
 138 
 139 
 140 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
 141   if (c_rarg1 == arg2) {
 142     if (c_rarg2 == arg1) {
 143       xchgq(arg1, arg2);
 144     } else {
 145       mov(c_rarg2, arg2);
 146       mov(c_rarg1, arg1);
 147     }
 148   } else {
 149     mov(c_rarg1, arg1);
 150     mov(c_rarg2, arg2);
 151   }
 152   return call_RT(oop_result1, metadata_result, entry, 2);
 153 }
 154 
 155 
 156 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
 157   // if there is any conflict use the stack
 158   if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
 159       arg2 == c_rarg1 || arg2 == c_rarg3 ||
 160       arg3 == c_rarg1 || arg3 == c_rarg2) {
 161     push(arg3);
 162     push(arg2);
 163     push(arg1);
 164     pop(c_rarg1);
 165     pop(c_rarg2);
 166     pop(c_rarg3);
 167   } else {
 168     mov(c_rarg1, arg1);
 169     mov(c_rarg2, arg2);
 170     mov(c_rarg3, arg3);
 171   }
 172   return call_RT(oop_result1, metadata_result, entry, 3);
 173 }
 174 
 175 
 176 // Implementation of StubFrame
 177 
 178 class StubFrame: public StackObj {
 179  private:
 180   StubAssembler* _sasm;
 181   bool _use_pop_on_epilog;
 182 
 183  public:
 184   StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, bool use_pop_on_epilog = false);
 185   void load_argument(int offset_in_words, Register reg);
 186 
 187   ~StubFrame();
 188 };
 189 
 190 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
 191   set_info(name, must_gc_arguments);
 192   enter();
 193 }
 194 
 195 void StubAssembler::epilogue(bool use_pop) {
 196   // Avoid using a leave instruction when this frame may
 197   // have been frozen, since the current value of rbp
 198   // restored from the stub would be invalid. We still
 199   // must restore the rbp value saved on enter though.
 200   use_pop ? pop(rbp) : leave();
 201   ret(0);
 202 }
 203 
 204 #define __ _sasm->
 205 
 206 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, bool use_pop_on_epilog) {
 207   _sasm = sasm;
 208   _use_pop_on_epilog = use_pop_on_epilog;
 209   __ prologue(name, must_gc_arguments);
 210 }
 211 
 212 // load parameters that were stored with LIR_Assembler::store_parameter
 213 // Note: offsets for store_parameter and load_argument must match
 214 void StubFrame::load_argument(int offset_in_words, Register reg) {
 215   __ load_parameter(offset_in_words, reg);
 216 }
 217 
 218 
 219 StubFrame::~StubFrame() {
 220   __ epilogue(_use_pop_on_epilog);
 221 }
 222 
 223 #undef __
 224 
 225 
 226 // Implementation of Runtime1
 227 
 228 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
 229 const int xmm_regs_as_doubles_size_in_slots = FrameMap::nof_xmm_regs * 2;
 230 
 231 // Stack layout for saving/restoring  all the registers needed during a runtime
 232 // call (this includes deoptimization)
 233 // Note: note that users of this frame may well have arguments to some runtime
 234 // while these values are on the stack. These positions neglect those arguments
 235 // but the code in save_live_registers will take the argument count into
 236 // account.
 237 //
 238 #define SLOT2(x) x,
 239 #define SLOT_PER_WORD 2
 240 
 241 enum reg_save_layout {
 242   // 64bit needs to keep stack 16 byte aligned. So we add some alignment dummies to make that
 243   // happen and will assert if the stack size we create is misaligned
 244   align_dummy_0, align_dummy_1,
 245 #ifdef _WIN64
 246   // Windows always allocates space for it's argument registers (see
 247   // frame::arg_reg_save_area_bytes).
 248   arg_reg_save_1, arg_reg_save_1H,                                                          // 0, 4
 249   arg_reg_save_2, arg_reg_save_2H,                                                          // 8, 12
 250   arg_reg_save_3, arg_reg_save_3H,                                                          // 16, 20
 251   arg_reg_save_4, arg_reg_save_4H,                                                          // 24, 28
 252 #endif // _WIN64
 253   xmm_regs_as_doubles_off,                                                                  // 32
 254   float_regs_as_doubles_off = xmm_regs_as_doubles_off + xmm_regs_as_doubles_size_in_slots,  // 160
 255   fpu_state_off = float_regs_as_doubles_off + float_regs_as_doubles_size_in_slots,          // 224
 256   // fpu_state_end_off is exclusive
 257   fpu_state_end_off = fpu_state_off + (FPUStateSizeInWords / SLOT_PER_WORD),                // 352
 258   marker = fpu_state_end_off, SLOT2(markerH)                                                // 352, 356
 259   extra_space_offset,                                                                       // 360
 260   r15_off = extra_space_offset, r15H_off,                                                   // 360, 364
 261   r14_off, r14H_off,                                                                        // 368, 372
 262   r13_off, r13H_off,                                                                        // 376, 380
 263   r12_off, r12H_off,                                                                        // 384, 388
 264   r11_off, r11H_off,                                                                        // 392, 396
 265   r10_off, r10H_off,                                                                        // 400, 404
 266   r9_off, r9H_off,                                                                          // 408, 412
 267   r8_off, r8H_off,                                                                          // 416, 420
 268   rdi_off, rdiH_off,                                                                        // 424, 428
 269   rsi_off, SLOT2(rsiH_off)                                                                  // 432, 436
 270   rbp_off, SLOT2(rbpH_off)                                                                  // 440, 444
 271   rsp_off, SLOT2(rspH_off)                                                                  // 448, 452
 272   rbx_off, SLOT2(rbxH_off)                                                                  // 456, 460
 273   rdx_off, SLOT2(rdxH_off)                                                                  // 464, 468
 274   rcx_off, SLOT2(rcxH_off)                                                                  // 472, 476
 275   rax_off, SLOT2(raxH_off)                                                                  // 480, 484
 276   saved_rbp_off, SLOT2(saved_rbpH_off)                                                      // 488, 492
 277   return_off, SLOT2(returnH_off)                                                            // 496, 500
 278   reg_save_frame_size   // As noted: neglects any parameters to runtime                     // 504
 279 };
 280 
 281 // Save off registers which might be killed by calls into the runtime.
 282 // Tries to smart of about FP registers.  In particular we separate
 283 // saving and describing the FPU registers for deoptimization since we
 284 // have to save the FPU registers twice if we describe them and on P4
 285 // saving FPU registers which don't contain anything appears
 286 // expensive.  The deopt blob is the only thing which needs to
 287 // describe FPU registers.  In all other cases it should be sufficient
 288 // to simply save their current value.
 289 //
 290 static OopMap* generate_oop_map(StubAssembler* sasm, int num_rt_args,
 291                                 bool save_fpu_registers = true) {
 292 
 293   // In 64bit all the args are in regs so there are no additional stack slots
 294   num_rt_args = 0;
 295   assert((reg_save_frame_size * VMRegImpl::stack_slot_size) % 16 == 0, "must be 16 byte aligned");
 296   int frame_size_in_slots = reg_save_frame_size + num_rt_args; // args + thread
 297   sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
 298 
 299   // record saved value locations in an OopMap
 300   // locations are offsets from sp after runtime call; num_rt_args is number of arguments in call, including thread
 301   OopMap* map = new OopMap(frame_size_in_slots, 0);
 302   map->set_callee_saved(VMRegImpl::stack2reg(rax_off + num_rt_args), rax->as_VMReg());
 303   map->set_callee_saved(VMRegImpl::stack2reg(rcx_off + num_rt_args), rcx->as_VMReg());
 304   map->set_callee_saved(VMRegImpl::stack2reg(rdx_off + num_rt_args), rdx->as_VMReg());
 305   map->set_callee_saved(VMRegImpl::stack2reg(rbx_off + num_rt_args), rbx->as_VMReg());
 306   map->set_callee_saved(VMRegImpl::stack2reg(rsi_off + num_rt_args), rsi->as_VMReg());
 307   map->set_callee_saved(VMRegImpl::stack2reg(rdi_off + num_rt_args), rdi->as_VMReg());
 308   map->set_callee_saved(VMRegImpl::stack2reg(r8_off + num_rt_args),  r8->as_VMReg());
 309   map->set_callee_saved(VMRegImpl::stack2reg(r9_off + num_rt_args),  r9->as_VMReg());
 310   map->set_callee_saved(VMRegImpl::stack2reg(r10_off + num_rt_args), r10->as_VMReg());
 311   map->set_callee_saved(VMRegImpl::stack2reg(r11_off + num_rt_args), r11->as_VMReg());
 312   map->set_callee_saved(VMRegImpl::stack2reg(r12_off + num_rt_args), r12->as_VMReg());
 313   map->set_callee_saved(VMRegImpl::stack2reg(r13_off + num_rt_args), r13->as_VMReg());
 314   map->set_callee_saved(VMRegImpl::stack2reg(r14_off + num_rt_args), r14->as_VMReg());
 315   map->set_callee_saved(VMRegImpl::stack2reg(r15_off + num_rt_args), r15->as_VMReg());
 316 
 317   // This is stupid but needed.
 318   map->set_callee_saved(VMRegImpl::stack2reg(raxH_off + num_rt_args), rax->as_VMReg()->next());
 319   map->set_callee_saved(VMRegImpl::stack2reg(rcxH_off + num_rt_args), rcx->as_VMReg()->next());
 320   map->set_callee_saved(VMRegImpl::stack2reg(rdxH_off + num_rt_args), rdx->as_VMReg()->next());
 321   map->set_callee_saved(VMRegImpl::stack2reg(rbxH_off + num_rt_args), rbx->as_VMReg()->next());
 322   map->set_callee_saved(VMRegImpl::stack2reg(rsiH_off + num_rt_args), rsi->as_VMReg()->next());
 323   map->set_callee_saved(VMRegImpl::stack2reg(rdiH_off + num_rt_args), rdi->as_VMReg()->next());
 324 
 325   map->set_callee_saved(VMRegImpl::stack2reg(r8H_off + num_rt_args),  r8->as_VMReg()->next());
 326   map->set_callee_saved(VMRegImpl::stack2reg(r9H_off + num_rt_args),  r9->as_VMReg()->next());
 327   map->set_callee_saved(VMRegImpl::stack2reg(r10H_off + num_rt_args), r10->as_VMReg()->next());
 328   map->set_callee_saved(VMRegImpl::stack2reg(r11H_off + num_rt_args), r11->as_VMReg()->next());
 329   map->set_callee_saved(VMRegImpl::stack2reg(r12H_off + num_rt_args), r12->as_VMReg()->next());
 330   map->set_callee_saved(VMRegImpl::stack2reg(r13H_off + num_rt_args), r13->as_VMReg()->next());
 331   map->set_callee_saved(VMRegImpl::stack2reg(r14H_off + num_rt_args), r14->as_VMReg()->next());
 332   map->set_callee_saved(VMRegImpl::stack2reg(r15H_off + num_rt_args), r15->as_VMReg()->next());
 333 
 334   int xmm_bypass_limit = FrameMap::get_num_caller_save_xmms();
 335 
 336   if (save_fpu_registers) {
 337     int xmm_off = xmm_regs_as_doubles_off;
 338     for (int n = 0; n < FrameMap::nof_xmm_regs; n++) {
 339       if (n < xmm_bypass_limit) {
 340         VMReg xmm_name_0 = as_XMMRegister(n)->as_VMReg();
 341         map->set_callee_saved(VMRegImpl::stack2reg(xmm_off + num_rt_args), xmm_name_0);
 342         // %%% This is really a waste but we'll keep things as they were for now
 343         if (true) {
 344           map->set_callee_saved(VMRegImpl::stack2reg(xmm_off + 1 + num_rt_args), xmm_name_0->next());
 345         }
 346       }
 347       xmm_off += 2;
 348     }
 349     assert(xmm_off == float_regs_as_doubles_off, "incorrect number of xmm registers");
 350   }
 351 
 352   return map;
 353 }
 354 
 355 #define __ this->
 356 
 357 void C1_MacroAssembler::save_live_registers_no_oop_map(bool save_fpu_registers) {
 358   __ block_comment("save_live_registers");
 359 
 360   // Push CPU state in multiple of 16 bytes
 361   __ save_legacy_gprs();
 362 
 363   __ subptr(rsp, extra_space_offset * VMRegImpl::stack_slot_size);
 364 
 365 #ifdef ASSERT
 366   __ movptr(Address(rsp, marker * VMRegImpl::stack_slot_size), (int32_t)0xfeedbeef);
 367 #endif
 368 
 369   if (save_fpu_registers) {
 370     // save XMM registers
 371     // XMM registers can contain float or double values, but this is not known here,
 372     // so always save them as doubles.
 373     // note that float values are _not_ converted automatically, so for float values
 374     // the second word contains only garbage data.
 375     int xmm_bypass_limit = FrameMap::get_num_caller_save_xmms();
 376     int offset = 0;
 377     for (int n = 0; n < xmm_bypass_limit; n++) {
 378       XMMRegister xmm_name = as_XMMRegister(n);
 379       __ movdbl(Address(rsp, xmm_regs_as_doubles_off * VMRegImpl::stack_slot_size + offset), xmm_name);
 380       offset += 8;
 381     }
 382   }
 383 }
 384 
 385 #undef __
 386 #define __ sasm->
 387 
 388 static void restore_fpu(C1_MacroAssembler* sasm, bool restore_fpu_registers) {
 389   if (restore_fpu_registers) {
 390     // restore XMM registers
 391     int xmm_bypass_limit = FrameMap::get_num_caller_save_xmms();
 392     int offset = 0;
 393     for (int n = 0; n < xmm_bypass_limit; n++) {
 394       XMMRegister xmm_name = as_XMMRegister(n);
 395       __ movdbl(xmm_name, Address(rsp, xmm_regs_as_doubles_off * VMRegImpl::stack_slot_size + offset));
 396       offset += 8;
 397     }
 398   }
 399 
 400 #ifdef ASSERT
 401   {
 402     Label ok;
 403     __ cmpptr(Address(rsp, marker * VMRegImpl::stack_slot_size), (int32_t)0xfeedbeef);
 404     __ jcc(Assembler::equal, ok);
 405     __ stop("bad offsets in frame");
 406     __ bind(ok);
 407   }
 408 #endif // ASSERT
 409 
 410   __ addptr(rsp, extra_space_offset * VMRegImpl::stack_slot_size);
 411 }
 412 
 413 #undef __
 414 #define __ this->
 415 
 416 void C1_MacroAssembler::restore_live_registers(bool restore_fpu_registers) {
 417   __ block_comment("restore_live_registers");
 418 
 419   restore_fpu(this, restore_fpu_registers);
 420   __ restore_legacy_gprs();
 421 }
 422 
 423 
 424 void C1_MacroAssembler::restore_live_registers_except_rax(bool restore_fpu_registers) {
 425   __ block_comment("restore_live_registers_except_rax");
 426 
 427   restore_fpu(this, restore_fpu_registers);
 428 
 429   __ movptr(r15, Address(rsp, 0));
 430   __ movptr(r14, Address(rsp, wordSize));
 431   __ movptr(r13, Address(rsp, 2 * wordSize));
 432   __ movptr(r12, Address(rsp, 3 * wordSize));
 433   __ movptr(r11, Address(rsp, 4 * wordSize));
 434   __ movptr(r10, Address(rsp, 5 * wordSize));
 435   __ movptr(r9,  Address(rsp, 6 * wordSize));
 436   __ movptr(r8,  Address(rsp, 7 * wordSize));
 437   __ movptr(rdi, Address(rsp, 8 * wordSize));
 438   __ movptr(rsi, Address(rsp, 9 * wordSize));
 439   __ movptr(rbp, Address(rsp, 10 * wordSize));
 440   // skip rsp
 441   __ movptr(rbx, Address(rsp, 12 * wordSize));
 442   __ movptr(rdx, Address(rsp, 13 * wordSize));
 443   __ movptr(rcx, Address(rsp, 14 * wordSize));
 444 
 445   __ addptr(rsp, 16 * wordSize);
 446 }
 447 
 448 #undef __
 449 #define __ sasm->
 450 
 451 static OopMap* save_live_registers(StubAssembler* sasm, int num_rt_args,
 452                                    bool save_fpu_registers = true) {
 453   __ save_live_registers_no_oop_map(save_fpu_registers);
 454   return generate_oop_map(sasm, num_rt_args, save_fpu_registers);
 455 }
 456 
 457 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
 458   __ restore_live_registers(restore_fpu_registers);
 459 }
 460 
 461 static void restore_live_registers_except_rax(StubAssembler* sasm, bool restore_fpu_registers = true) {
 462   sasm->restore_live_registers_except_rax(restore_fpu_registers);
 463 }
 464 
 465 
 466 void Runtime1::initialize_pd() {
 467   // nothing to do
 468 }
 469 
 470 // return: offset in 64-bit words.
 471 uint Runtime1::runtime_blob_current_thread_offset(frame f) {
 472   return r15_off / 2;  // rsp offsets are in halfwords
 473 }
 474 
 475 // Target: the entry point of the method that creates and posts the exception oop.
 476 // has_argument: true if the exception needs arguments (passed on the stack because
 477 //               registers must be preserved).
 478 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
 479   // Preserve all registers.
 480   int num_rt_args = has_argument ? (2 + 1) : 1;
 481   OopMap* oop_map = save_live_registers(sasm, num_rt_args);
 482 
 483   // Now all registers are saved and can be used freely.
 484   // Verify that no old value is used accidentally.
 485   __ invalidate_registers(true, true, true, true, true, true);
 486 
 487   // Registers used by this stub.
 488   const Register temp_reg = rbx;
 489 
 490   // Load arguments for exception that are passed as arguments into the stub.
 491   if (has_argument) {
 492     __ movptr(c_rarg1, Address(rbp, 2*BytesPerWord));
 493     __ movptr(c_rarg2, Address(rbp, 3*BytesPerWord));
 494   }
 495   int call_offset = __ call_RT(noreg, noreg, target, num_rt_args - 1);
 496 
 497   OopMapSet* oop_maps = new OopMapSet();
 498   oop_maps->add_gc_map(call_offset, oop_map);
 499 
 500   __ stop("should not reach here");
 501 
 502   return oop_maps;
 503 }
 504 
 505 
 506 OopMapSet* Runtime1::generate_handle_exception(C1StubId id, StubAssembler *sasm) {
 507   __ block_comment("generate_handle_exception");
 508 
 509   // incoming parameters
 510   const Register exception_oop = rax;
 511   const Register exception_pc  = rdx;
 512   // other registers used in this stub
 513   const Register thread = r15_thread;
 514 
 515   // Save registers, if required.
 516   OopMapSet* oop_maps = new OopMapSet();
 517   OopMap* oop_map = nullptr;
 518   switch (id) {
 519   case C1StubId::forward_exception_id:
 520     // We're handling an exception in the context of a compiled frame.
 521     // The registers have been saved in the standard places.  Perform
 522     // an exception lookup in the caller and dispatch to the handler
 523     // if found.  Otherwise unwind and dispatch to the callers
 524     // exception handler.
 525     oop_map = generate_oop_map(sasm, 1 /*thread*/);
 526 
 527     // load and clear pending exception oop into RAX
 528     __ movptr(exception_oop, Address(thread, Thread::pending_exception_offset()));
 529     __ movptr(Address(thread, Thread::pending_exception_offset()), NULL_WORD);
 530 
 531     // load issuing PC (the return address for this stub) into rdx
 532     __ movptr(exception_pc, Address(rbp, 1*BytesPerWord));
 533 
 534     // make sure that the vm_results are cleared (may be unnecessary)
 535     __ movptr(Address(thread, JavaThread::vm_result_oop_offset()),   NULL_WORD);
 536     __ movptr(Address(thread, JavaThread::vm_result_metadata_offset()), NULL_WORD);
 537     break;
 538   case C1StubId::handle_exception_nofpu_id:
 539   case C1StubId::handle_exception_id:
 540     // At this point all registers MAY be live.
 541     oop_map = save_live_registers(sasm, 1 /*thread*/, id != C1StubId::handle_exception_nofpu_id);
 542     break;
 543   case C1StubId::handle_exception_from_callee_id: {
 544     // At this point all registers except exception oop (RAX) and
 545     // exception pc (RDX) are dead.
 546     const int frame_size = 2 /*BP, return address*/ WIN64_ONLY(+ frame::arg_reg_save_area_bytes / BytesPerWord);
 547     oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
 548     sasm->set_frame_size(frame_size);
 549     WIN64_ONLY(__ subq(rsp, frame::arg_reg_save_area_bytes));
 550     break;
 551   }
 552   default:  ShouldNotReachHere();
 553   }
 554 
 555   // verify that only rax, and rdx is valid at this time
 556   __ invalidate_registers(false, true, true, false, true, true);
 557   // verify that rax, contains a valid exception
 558   __ verify_not_null_oop(exception_oop);
 559 
 560 #ifdef ASSERT
 561   // check that fields in JavaThread for exception oop and issuing pc are
 562   // empty before writing to them
 563   Label oop_empty;
 564   __ cmpptr(Address(thread, JavaThread::exception_oop_offset()), NULL_WORD);
 565   __ jcc(Assembler::equal, oop_empty);
 566   __ stop("exception oop already set");
 567   __ bind(oop_empty);
 568 
 569   Label pc_empty;
 570   __ cmpptr(Address(thread, JavaThread::exception_pc_offset()), 0);
 571   __ jcc(Assembler::equal, pc_empty);
 572   __ stop("exception pc already set");
 573   __ bind(pc_empty);
 574 #endif
 575 
 576   // save exception oop and issuing pc into JavaThread
 577   // (exception handler will load it from here)
 578   __ movptr(Address(thread, JavaThread::exception_oop_offset()), exception_oop);
 579   __ movptr(Address(thread, JavaThread::exception_pc_offset()),  exception_pc);
 580 
 581   // patch throwing pc into return address (has bci & oop map)
 582   __ movptr(Address(rbp, 1*BytesPerWord), exception_pc);
 583 
 584   // compute the exception handler.
 585   // the exception oop and the throwing pc are read from the fields in JavaThread
 586   int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
 587   oop_maps->add_gc_map(call_offset, oop_map);
 588 
 589   // rax: handler address
 590   //      will be the deopt blob if nmethod was deoptimized while we looked up
 591   //      handler regardless of whether handler existed in the nmethod.
 592 
 593   // only rax, is valid at this time, all other registers have been destroyed by the runtime call
 594   __ invalidate_registers(false, true, true, true, true, true);
 595 
 596   // patch the return address, this stub will directly return to the exception handler
 597   __ movptr(Address(rbp, 1*BytesPerWord), rax);
 598 
 599   switch (id) {
 600   case C1StubId::forward_exception_id:
 601   case C1StubId::handle_exception_nofpu_id:
 602   case C1StubId::handle_exception_id:
 603     // Restore the registers that were saved at the beginning.
 604     restore_live_registers(sasm, id != C1StubId::handle_exception_nofpu_id);
 605     break;
 606   case C1StubId::handle_exception_from_callee_id:
 607     // WIN64_ONLY: No need to add frame::arg_reg_save_area_bytes to SP
 608     // since we do a leave anyway.
 609 
 610     // Pop the return address.
 611     __ leave();
 612     __ pop(rcx);
 613     __ jmp(rcx);  // jump to exception handler
 614     break;
 615   default:  ShouldNotReachHere();
 616   }
 617 
 618   return oop_maps;
 619 }
 620 
 621 
 622 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
 623   // incoming parameters
 624   const Register exception_oop = rax;
 625   // callee-saved copy of exception_oop during runtime call
 626   const Register exception_oop_callee_saved = r14;
 627   // other registers used in this stub
 628   const Register exception_pc = rdx;
 629   const Register handler_addr = rbx;
 630   const Register thread = r15_thread;
 631 
 632   if (AbortVMOnException) {
 633     __ enter();
 634     save_live_registers(sasm, 2);
 635     __ call_VM_leaf(CAST_FROM_FN_PTR(address, check_abort_on_vm_exception), rax);
 636     restore_live_registers(sasm);
 637     __ leave();
 638   }
 639 
 640   // verify that only rax, is valid at this time
 641   __ invalidate_registers(false, true, true, true, true, true);
 642 
 643 #ifdef ASSERT
 644   // check that fields in JavaThread for exception oop and issuing pc are empty
 645   Label oop_empty;
 646   __ cmpptr(Address(thread, JavaThread::exception_oop_offset()), 0);
 647   __ jcc(Assembler::equal, oop_empty);
 648   __ stop("exception oop must be empty");
 649   __ bind(oop_empty);
 650 
 651   Label pc_empty;
 652   __ cmpptr(Address(thread, JavaThread::exception_pc_offset()), 0);
 653   __ jcc(Assembler::equal, pc_empty);
 654   __ stop("exception pc must be empty");
 655   __ bind(pc_empty);
 656 #endif
 657 
 658   // save exception_oop in callee-saved register to preserve it during runtime calls
 659   __ verify_not_null_oop(exception_oop);
 660   __ movptr(exception_oop_callee_saved, exception_oop);
 661 
 662   // Get return address (is on top of stack after leave).
 663   __ movptr(exception_pc, Address(rsp, 0));
 664 
 665   // search the exception handler address of the caller (using the return address)
 666   __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), thread, exception_pc);
 667   // rax: exception handler address of the caller
 668 
 669   // Only RAX and RSI are valid at this time, all other registers have been destroyed by the call.
 670   __ invalidate_registers(false, true, true, true, false, true);
 671 
 672   // move result of call into correct register
 673   __ movptr(handler_addr, rax);
 674 
 675   // Restore exception oop to RAX (required convention of exception handler).
 676   __ movptr(exception_oop, exception_oop_callee_saved);
 677 
 678   // verify that there is really a valid exception in rax
 679   __ verify_not_null_oop(exception_oop);
 680 
 681   // get throwing pc (= return address).
 682   // rdx has been destroyed by the call, so it must be set again
 683   // the pop is also necessary to simulate the effect of a ret(0)
 684   __ pop(exception_pc);
 685 
 686   // continue at exception handler (return address removed)
 687   // note: do *not* remove arguments when unwinding the
 688   //       activation since the caller assumes having
 689   //       all arguments on the stack when entering the
 690   //       runtime to determine the exception handler
 691   //       (GC happens at call site with arguments!)
 692   // rax: exception oop
 693   // rdx: throwing pc
 694   // rbx: exception handler
 695   __ jmp(handler_addr);
 696 }
 697 
 698 
 699 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
 700   // use the maximum number of runtime-arguments here because it is difficult to
 701   // distinguish each RT-Call.
 702   // Note: This number affects also the RT-Call in generate_handle_exception because
 703   //       the oop-map is shared for all calls.
 704   const int num_rt_args = 2;  // thread + dummy
 705 
 706   DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
 707   assert(deopt_blob != nullptr, "deoptimization blob must have been created");
 708 
 709   OopMap* oop_map = save_live_registers(sasm, num_rt_args);
 710 
 711   const Register thread = r15_thread;
 712   // No need to worry about dummy
 713   __ mov(c_rarg0, thread);
 714   __ set_last_Java_frame(noreg, rbp, nullptr, rscratch1);
 715   // do the call
 716   __ call(RuntimeAddress(target));
 717   OopMapSet* oop_maps = new OopMapSet();
 718   oop_maps->add_gc_map(__ offset(), oop_map);
 719   // verify callee-saved register
 720 #ifdef ASSERT
 721   guarantee(thread != rax, "change this code");
 722   __ push(rax);
 723   { Label L;
 724     __ get_thread_slow(rax);
 725     __ cmpptr(thread, rax);
 726     __ jcc(Assembler::equal, L);
 727     __ stop("StubAssembler::call_RT: rdi/r15 not callee saved?");
 728     __ bind(L);
 729   }
 730   __ pop(rax);
 731 #endif
 732   __ reset_last_Java_frame(true);
 733 
 734   // check for pending exceptions
 735   { Label L;
 736     __ cmpptr(Address(thread, Thread::pending_exception_offset()), NULL_WORD);
 737     __ jcc(Assembler::equal, L);
 738     // exception pending => remove activation and forward to exception handler
 739 
 740     __ testptr(rax, rax);                                   // have we deoptimized?
 741     __ jump_cc(Assembler::equal,
 742                RuntimeAddress(Runtime1::entry_for(C1StubId::forward_exception_id)));
 743 
 744     // the deopt blob expects exceptions in the special fields of
 745     // JavaThread, so copy and clear pending exception.
 746 
 747     // load and clear pending exception
 748     __ movptr(rax, Address(thread, Thread::pending_exception_offset()));
 749     __ movptr(Address(thread, Thread::pending_exception_offset()), NULL_WORD);
 750 
 751     // check that there is really a valid exception
 752     __ verify_not_null_oop(rax);
 753 
 754     // load throwing pc: this is the return address of the stub
 755     __ movptr(rdx, Address(rsp, return_off * VMRegImpl::stack_slot_size));
 756 
 757 #ifdef ASSERT
 758     // check that fields in JavaThread for exception oop and issuing pc are empty
 759     Label oop_empty;
 760     __ cmpptr(Address(thread, JavaThread::exception_oop_offset()), NULL_WORD);
 761     __ jcc(Assembler::equal, oop_empty);
 762     __ stop("exception oop must be empty");
 763     __ bind(oop_empty);
 764 
 765     Label pc_empty;
 766     __ cmpptr(Address(thread, JavaThread::exception_pc_offset()), NULL_WORD);
 767     __ jcc(Assembler::equal, pc_empty);
 768     __ stop("exception pc must be empty");
 769     __ bind(pc_empty);
 770 #endif
 771 
 772     // store exception oop and throwing pc to JavaThread
 773     __ movptr(Address(thread, JavaThread::exception_oop_offset()), rax);
 774     __ movptr(Address(thread, JavaThread::exception_pc_offset()), rdx);
 775 
 776     restore_live_registers(sasm);
 777 
 778     __ leave();
 779     __ addptr(rsp, BytesPerWord);  // remove return address from stack
 780 
 781     // Forward the exception directly to deopt blob. We can blow no
 782     // registers and must leave throwing pc on the stack.  A patch may
 783     // have values live in registers so the entry point with the
 784     // exception in tls.
 785     __ jump(RuntimeAddress(deopt_blob->unpack_with_exception_in_tls()));
 786 
 787     __ bind(L);
 788   }
 789 
 790 
 791   // Runtime will return true if the nmethod has been deoptimized during
 792   // the patching process. In that case we must do a deopt reexecute instead.
 793 
 794   Label cont;
 795 
 796   __ testptr(rax, rax);                                 // have we deoptimized?
 797   __ jcc(Assembler::equal, cont);                       // no
 798 
 799   // Will reexecute. Proper return address is already on the stack we just restore
 800   // registers, pop all of our frame but the return address and jump to the deopt blob
 801   restore_live_registers(sasm);
 802   __ leave();
 803   __ jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
 804 
 805   __ bind(cont);
 806   restore_live_registers(sasm);
 807   __ leave();
 808   __ ret(0);
 809 
 810   return oop_maps;
 811 }
 812 
 813 
 814 OopMapSet* Runtime1::generate_code_for(C1StubId id, StubAssembler* sasm) {
 815 
 816   // for better readability
 817   const bool must_gc_arguments = true;
 818   const bool dont_gc_arguments = false;
 819 
 820   // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
 821   bool save_fpu_registers = true;
 822 
 823   // stub code & info for the different stubs
 824   OopMapSet* oop_maps = nullptr;
 825   switch (id) {
 826     case C1StubId::forward_exception_id:
 827       {
 828         oop_maps = generate_handle_exception(id, sasm);
 829         __ leave();
 830         __ ret(0);
 831       }
 832       break;
 833 
 834     case C1StubId::new_instance_id:
 835     case C1StubId::fast_new_instance_id:
 836     case C1StubId::fast_new_instance_init_check_id:
 837       {
 838         Register klass = rdx; // Incoming
 839         Register obj   = rax; // Result
 840 
 841         if (id == C1StubId::new_instance_id) {
 842           __ set_info("new_instance", dont_gc_arguments);
 843         } else if (id == C1StubId::fast_new_instance_id) {
 844           __ set_info("fast new_instance", dont_gc_arguments);
 845         } else {
 846           assert(id == C1StubId::fast_new_instance_init_check_id, "bad C1StubId");
 847           __ set_info("fast new_instance init check", dont_gc_arguments);
 848         }
 849 
 850         __ enter();
 851         OopMap* map = save_live_registers(sasm, 2);
 852         int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
 853         oop_maps = new OopMapSet();
 854         oop_maps->add_gc_map(call_offset, map);
 855         restore_live_registers_except_rax(sasm);
 856         __ verify_oop(obj);
 857         __ leave();
 858         __ ret(0);
 859 
 860         // rax,: new instance
 861       }
 862 
 863       break;
 864 
 865     case C1StubId::counter_overflow_id:
 866       {
 867         Register bci = rax, method = rbx;
 868         __ enter();
 869         OopMap* map = save_live_registers(sasm, 3);
 870         // Retrieve bci
 871         __ movl(bci, Address(rbp, 2*BytesPerWord));
 872         // And a pointer to the Method*
 873         __ movptr(method, Address(rbp, 3*BytesPerWord));
 874         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
 875         oop_maps = new OopMapSet();
 876         oop_maps->add_gc_map(call_offset, map);
 877         restore_live_registers(sasm);
 878         __ leave();
 879         __ ret(0);
 880       }
 881       break;
 882 
 883     case C1StubId::new_type_array_id:
 884     case C1StubId::new_object_array_id:
 885       {
 886         Register length   = rbx; // Incoming
 887         Register klass    = rdx; // Incoming
 888         Register obj      = rax; // Result
 889 
 890         if (id == C1StubId::new_type_array_id) {
 891           __ set_info("new_type_array", dont_gc_arguments);
 892         } else {
 893           __ set_info("new_object_array", dont_gc_arguments);
 894         }
 895 
 896 #ifdef ASSERT
 897         // assert object type is really an array of the proper kind
 898         {
 899           Label ok;
 900           Register t0 = obj;
 901           __ movl(t0, Address(klass, Klass::layout_helper_offset()));
 902           __ sarl(t0, Klass::_lh_array_tag_shift);
 903           int tag = ((id == C1StubId::new_type_array_id)
 904                      ? Klass::_lh_array_tag_type_value
 905                      : Klass::_lh_array_tag_obj_value);
 906           __ cmpl(t0, tag);
 907           __ jcc(Assembler::equal, ok);
 908           __ stop("assert(is an array klass)");
 909           __ should_not_reach_here();
 910           __ bind(ok);
 911         }
 912 #endif // ASSERT
 913 
 914         __ enter();
 915         OopMap* map = save_live_registers(sasm, 3);
 916         int call_offset;
 917         if (id == C1StubId::new_type_array_id) {
 918           call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
 919         } else {
 920           call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
 921         }
 922 
 923         oop_maps = new OopMapSet();
 924         oop_maps->add_gc_map(call_offset, map);
 925         restore_live_registers_except_rax(sasm);
 926 
 927         __ verify_oop(obj);
 928         __ leave();
 929         __ ret(0);
 930 
 931         // rax,: new array
 932       }
 933       break;
 934 
 935     case C1StubId::new_multi_array_id:
 936       { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
 937         // rax,: klass
 938         // rbx,: rank
 939         // rcx: address of 1st dimension
 940         OopMap* map = save_live_registers(sasm, 4);
 941         int call_offset = __ call_RT(rax, noreg, CAST_FROM_FN_PTR(address, new_multi_array), rax, rbx, rcx);
 942 
 943         oop_maps = new OopMapSet();
 944         oop_maps->add_gc_map(call_offset, map);
 945         restore_live_registers_except_rax(sasm);
 946 
 947         // rax,: new multi array
 948         __ verify_oop(rax);
 949       }
 950       break;
 951 
 952     case C1StubId::register_finalizer_id:
 953       {
 954         __ set_info("register_finalizer", dont_gc_arguments);
 955 
 956         // This is called via call_runtime so the arguments
 957         // will be place in C abi locations
 958 
 959         __ verify_oop(c_rarg0);
 960         __ mov(rax, c_rarg0);
 961 
 962         // load the klass and check the has finalizer flag
 963         Label register_finalizer;
 964         Register t = rsi;
 965         __ load_klass(t, rax, rscratch1);
 966         __ testb(Address(t, Klass::misc_flags_offset()), KlassFlags::_misc_has_finalizer);
 967         __ jcc(Assembler::notZero, register_finalizer);
 968         __ ret(0);
 969 
 970         __ bind(register_finalizer);
 971         __ enter();
 972         OopMap* oop_map = save_live_registers(sasm, 2 /*num_rt_args */);
 973         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), rax);
 974         oop_maps = new OopMapSet();
 975         oop_maps->add_gc_map(call_offset, oop_map);
 976 
 977         // Now restore all the live registers
 978         restore_live_registers(sasm);
 979 
 980         __ leave();
 981         __ ret(0);
 982       }
 983       break;
 984 
 985     case C1StubId::throw_range_check_failed_id:
 986       { StubFrame f(sasm, "range_check_failed", dont_gc_arguments);
 987         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
 988       }
 989       break;
 990 
 991     case C1StubId::throw_index_exception_id:
 992       { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments);
 993         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
 994       }
 995       break;
 996 
 997     case C1StubId::throw_div0_exception_id:
 998       { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments);
 999         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
1000       }
1001       break;
1002 
1003     case C1StubId::throw_null_pointer_exception_id:
1004       { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments);
1005         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
1006       }
1007       break;
1008 
1009     case C1StubId::handle_exception_nofpu_id:
1010     case C1StubId::handle_exception_id:
1011       { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1012         oop_maps = generate_handle_exception(id, sasm);
1013       }
1014       break;
1015 
1016     case C1StubId::handle_exception_from_callee_id:
1017       { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1018         oop_maps = generate_handle_exception(id, sasm);
1019       }
1020       break;
1021 
1022     case C1StubId::unwind_exception_id:
1023       { __ set_info("unwind_exception", dont_gc_arguments);
1024         // note: no stubframe since we are about to leave the current
1025         //       activation and we are calling a leaf VM function only.
1026         generate_unwind_exception(sasm);
1027       }
1028       break;
1029 
1030     case C1StubId::throw_array_store_exception_id:
1031       { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments);
1032         // tos + 0: link
1033         //     + 1: return address
1034         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1035       }
1036       break;
1037 
1038     case C1StubId::throw_class_cast_exception_id:
1039       { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments);
1040         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
1041       }
1042       break;
1043 
1044     case C1StubId::throw_incompatible_class_change_error_id:
1045       { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments);
1046         oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
1047       }
1048       break;
1049 
1050     case C1StubId::slow_subtype_check_id:
1051       {
1052         // Typical calling sequence:
1053         // __ push(klass_RInfo);  // object klass or other subclass
1054         // __ push(sup_k_RInfo);  // array element klass or other superclass
1055         // __ call(slow_subtype_check);
1056         // Note that the subclass is pushed first, and is therefore deepest.
1057         // Previous versions of this code reversed the names 'sub' and 'super'.
1058         // This was operationally harmless but made the code unreadable.
1059         enum layout {
1060           rax_off, SLOT2(raxH_off)
1061           rcx_off, SLOT2(rcxH_off)
1062           rsi_off, SLOT2(rsiH_off)
1063           rdi_off, SLOT2(rdiH_off)
1064           // saved_rbp_off, SLOT2(saved_rbpH_off)
1065           return_off, SLOT2(returnH_off)
1066           sup_k_off, SLOT2(sup_kH_off)
1067           klass_off, SLOT2(superH_off)
1068           framesize,
1069           result_off = klass_off  // deepest argument is also the return value
1070         };
1071 
1072         __ set_info("slow_subtype_check", dont_gc_arguments);
1073         __ push(rdi);
1074         __ push(rsi);
1075         __ push(rcx);
1076         __ push(rax);
1077 
1078         // This is called by pushing args and not with C abi
1079         __ movptr(rsi, Address(rsp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
1080         __ movptr(rax, Address(rsp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
1081 
1082         Label miss;
1083         __ check_klass_subtype_slow_path(rsi, rax, rcx, rdi, nullptr, &miss);
1084 
1085         // fallthrough on success:
1086         __ movptr(Address(rsp, (result_off) * VMRegImpl::stack_slot_size), 1); // result
1087         __ pop(rax);
1088         __ pop(rcx);
1089         __ pop(rsi);
1090         __ pop(rdi);
1091         __ ret(0);
1092 
1093         __ bind(miss);
1094         __ movptr(Address(rsp, (result_off) * VMRegImpl::stack_slot_size), NULL_WORD); // result
1095         __ pop(rax);
1096         __ pop(rcx);
1097         __ pop(rsi);
1098         __ pop(rdi);
1099         __ ret(0);
1100       }
1101       break;
1102 
1103     case C1StubId::is_instance_of_id:
1104       {
1105         // Mirror: c_rarg0  (Windows: rcx, SysV: rdi)
1106         // Object: c_rarg1  (Windows: rdx, SysV: rsi)
1107         // ObjClass: r9
1108         // Temps:  rcx, r8, r10, r11
1109         // Result: rax
1110 
1111         Register klass = r9, obj = c_rarg1, result = rax;
1112         Register temp0 = rcx, temp1 = r8, temp2 = r10, temp3 = r11;
1113 
1114         // Get the Klass* into r9. c_rarg0 is now dead.
1115         __ movptr(klass, Address(c_rarg0, java_lang_Class::klass_offset()));
1116 
1117         Label done, is_secondary, same;
1118 
1119         __ xorq(result, result);
1120         __ testq(klass, klass);
1121         __ jcc(Assembler::equal, done); // Klass is null
1122 
1123         __ testq(obj, obj);
1124         __ jcc(Assembler::equal, done); // obj is null
1125 
1126         __ movl(temp0, Address(klass, in_bytes(Klass::super_check_offset_offset())));
1127         __ cmpl(temp0, in_bytes(Klass::secondary_super_cache_offset()));
1128         __ jcc(Assembler::equal, is_secondary); // Klass is a secondary superclass
1129 
1130         // Klass is a concrete class
1131         __ load_klass(temp2, obj, /*tmp*/temp1);
1132         __ cmpptr(klass, Address(temp2, temp0));
1133         __ setcc(Assembler::equal, result);
1134         __ ret(0);
1135 
1136         __ bind(is_secondary);
1137 
1138         __ load_klass(obj, obj, /*tmp*/temp1);
1139 
1140         // This is necessary because I am never in my own secondary_super list.
1141         __ cmpptr(obj, klass);
1142         __ jcc(Assembler::equal, same);
1143 
1144         __ lookup_secondary_supers_table_var(obj, klass,
1145                                              /*temps*/temp0, temp1, temp2, temp3,
1146                                              result);
1147         __ testq(result, result);
1148 
1149         __ bind(same);
1150         __ setcc(Assembler::equal, result);
1151 
1152         __ bind(done);
1153         __ ret(0);
1154       }
1155       break;
1156 
1157     case C1StubId::monitorenter_nofpu_id:
1158       save_fpu_registers = false;
1159       // fall through
1160     case C1StubId::monitorenter_id:
1161       {
1162         StubFrame f(sasm, "monitorenter", dont_gc_arguments, true /* use_pop_on_epilog */);
1163         OopMap* map = save_live_registers(sasm, 3, save_fpu_registers);
1164 
1165         // Called with store_parameter and not C abi
1166 
1167         f.load_argument(1, rax); // rax,: object
1168         f.load_argument(0, rbx); // rbx,: lock address
1169 
1170         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), rax, rbx);
1171 
1172         oop_maps = new OopMapSet();
1173         oop_maps->add_gc_map(call_offset, map);
1174         restore_live_registers(sasm, save_fpu_registers);
1175       }
1176       break;
1177 
1178     case C1StubId::monitorexit_nofpu_id:
1179       save_fpu_registers = false;
1180       // fall through
1181     case C1StubId::monitorexit_id:
1182       {
1183         StubFrame f(sasm, "monitorexit", dont_gc_arguments);
1184         OopMap* map = save_live_registers(sasm, 2, save_fpu_registers);
1185 
1186         // Called with store_parameter and not C abi
1187 
1188         f.load_argument(0, rax); // rax,: lock address
1189 
1190         // note: really a leaf routine but must setup last java sp
1191         //       => use call_RT for now (speed can be improved by
1192         //       doing last java sp setup manually)
1193         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), rax);
1194 
1195         oop_maps = new OopMapSet();
1196         oop_maps->add_gc_map(call_offset, map);
1197         restore_live_registers(sasm, save_fpu_registers);
1198       }
1199       break;
1200 
1201     case C1StubId::deoptimize_id:
1202       {
1203         StubFrame f(sasm, "deoptimize", dont_gc_arguments);
1204         const int num_rt_args = 2;  // thread, trap_request
1205         OopMap* oop_map = save_live_registers(sasm, num_rt_args);
1206         f.load_argument(0, rax);
1207         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), rax);
1208         oop_maps = new OopMapSet();
1209         oop_maps->add_gc_map(call_offset, oop_map);
1210         restore_live_registers(sasm);
1211         DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1212         assert(deopt_blob != nullptr, "deoptimization blob must have been created");
1213         __ leave();
1214         __ jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1215       }
1216       break;
1217 
1218     case C1StubId::access_field_patching_id:
1219       { StubFrame f(sasm, "access_field_patching", dont_gc_arguments);
1220         // we should set up register map
1221         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1222       }
1223       break;
1224 
1225     case C1StubId::load_klass_patching_id:
1226       { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments);
1227         // we should set up register map
1228         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1229       }
1230       break;
1231 
1232     case C1StubId::load_mirror_patching_id:
1233       { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments);
1234         // we should set up register map
1235         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1236       }
1237       break;
1238 
1239     case C1StubId::load_appendix_patching_id:
1240       { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments);
1241         // we should set up register map
1242         oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1243       }
1244       break;
1245 
1246     case C1StubId::dtrace_object_alloc_id:
1247       { // rax,: object
1248         StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1249         // we can't gc here so skip the oopmap but make sure that all
1250         // the live registers get saved.
1251         save_live_registers(sasm, 1);
1252 
1253         __ mov(c_rarg0, rax);
1254         __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc))));
1255 
1256         restore_live_registers(sasm);
1257       }
1258       break;
1259 
1260     case C1StubId::fpu2long_stub_id:
1261       {
1262         Label done;
1263         __ cvttsd2siq(rax, Address(rsp, wordSize));
1264         __ cmp64(rax, ExternalAddress((address) StubRoutines::x86::double_sign_flip()));
1265         __ jccb(Assembler::notEqual, done);
1266         __ movq(rax, Address(rsp, wordSize));
1267         __ subptr(rsp, 8);
1268         __ movq(Address(rsp, 0), rax);
1269         __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, StubRoutines::x86::d2l_fixup())));
1270         __ pop(rax);
1271         __ bind(done);
1272         __ ret(0);
1273       }
1274       break;
1275 
1276     case C1StubId::predicate_failed_trap_id:
1277       {
1278         StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments);
1279 
1280         OopMap* map = save_live_registers(sasm, 1);
1281 
1282         int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1283         oop_maps = new OopMapSet();
1284         oop_maps->add_gc_map(call_offset, map);
1285         restore_live_registers(sasm);
1286         __ leave();
1287         DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1288         assert(deopt_blob != nullptr, "deoptimization blob must have been created");
1289 
1290         __ jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1291       }
1292       break;
1293 
1294     default:
1295       { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments);
1296         __ movptr(rax, (int)id);
1297         __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), rax);
1298         __ should_not_reach_here();
1299       }
1300       break;
1301   }
1302   return oop_maps;
1303 }
1304 
1305 #undef __
1306 
1307 const char *Runtime1::pd_name_for_address(address entry) {
1308   return "<unknown function>";
1309 }