ARM64: push/pop registers in stubs for safepoints

src/arm64/lithium-codegen-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 359 matching lines @@
 
   class PushSafepointRegistersScope BASE_EMBEDDED {
    public:
     PushSafepointRegistersScope(LCodeGen* codegen,
                                 Safepoint::Kind kind)
         : codegen_(codegen) {
       ASSERT(codegen_->info()->is_calling());
       ASSERT(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
       codegen_->expected_safepoint_kind_ = kind;
 
+      UseScratchRegisterScope temps(codegen_->masm_);
+      // Preserve the value of lr which must be saved on the stack (the call to
+      // the stub will clobber it).
+      Register to_be_pushed_lr =
+          temps.UnsafeAcquire(StoreRegistersStateStub::to_be_pushed_lr());
+      codegen_->masm_->Mov(to_be_pushed_lr, lr);
       switch (codegen_->expected_safepoint_kind_) {
-        case Safepoint::kWithRegisters:
-          codegen_->masm_->PushSafepointRegisters();
+        case Safepoint::kWithRegisters: {
+          StoreRegistersStateStub stub(kDontSaveFPRegs);
+          codegen_->masm_->CallStub(&stub);
           break;
-        case Safepoint::kWithRegistersAndDoubles:
-          codegen_->masm_->PushSafepointRegisters();
-          codegen_->masm_->PushSafepointFPRegisters();
+        }
+        case Safepoint::kWithRegistersAndDoubles: {
+          StoreRegistersStateStub stub(kSaveFPRegs);
+          codegen_->masm_->CallStub(&stub);
           break;
+        }
         default:
           UNREACHABLE();
       }
     }
 
     ~PushSafepointRegistersScope() {
       Safepoint::Kind kind = codegen_->expected_safepoint_kind_;
       ASSERT((kind & Safepoint::kWithRegisters) != 0);
       switch (kind) {
-        case Safepoint::kWithRegisters:
-          codegen_->masm_->PopSafepointRegisters();
+        case Safepoint::kWithRegisters: {
+          RestoreRegistersStateStub stub(kDontSaveFPRegs);
+          codegen_->masm_->CallStub(&stub);
           break;
-        case Safepoint::kWithRegistersAndDoubles:
-          codegen_->masm_->PopSafepointFPRegisters();
-          codegen_->masm_->PopSafepointRegisters();
+        }
+        case Safepoint::kWithRegistersAndDoubles: {
+          RestoreRegistersStateStub stub(kSaveFPRegs);
+          codegen_->masm_->CallStub(&stub);
           break;
+        }
         default:
           UNREACHABLE();
       }
       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
     }
 
    private:
     LCodeGen* codegen_;
   };
 
@@ skipping 53 matching lines @@
 
  protected:
   MacroAssembler* masm() const { return codegen_->masm(); }
 
   LCodeGen* codegen_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_LITHIUM_CODEGEN_ARM64_H_