ARM64: Move THR to R26 so special registers are contiguous.

runtime/vm/stub_code_arm64.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 83 matching lines @@
 
   __ StoreToOffset(R0, SP, thread_offset);
   __ StoreToOffset(R1, SP, argc_tag_offset);
   __ StoreToOffset(R2, SP, argv_offset);
   __ StoreToOffset(R3, SP, retval_offset);
   __ mov(R0, SP);  // Pass the pointer to the NativeArguments.
 
   // We are entering runtime code, so the C stack pointer must be restored from
   // the stack limit to the top of the stack. We cache the stack limit address
   // in a callee-saved register.
-  __ mov(R26, CSP);
+  __ mov(R25, CSP);
   __ mov(CSP, SP);
 
   __ blr(R5);
   __ Comment("CallToRuntimeStub return");
 
   // Restore SP and CSP.
   __ mov(SP, CSP);
-  __ mov(CSP, R26);
+  __ mov(CSP, R25);
 
   // Retval is next to 1st argument.
   // Mark that the thread is executing Dart code.
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
 
   __ LeaveStubFrame();
@@ skipping 74 matching lines @@
   // For now, space is reserved on the stack and we pass a pointer to it.
   __ StoreToOffset(R0, SP, thread_offset);
   __ StoreToOffset(R1, SP, argc_tag_offset);
   __ StoreToOffset(R2, SP, argv_offset);
   __ StoreToOffset(R3, SP, retval_offset);
   __ mov(R0, SP);  // Pass the pointer to the NativeArguments.
 
   // We are entering runtime code, so the C stack pointer must be restored from
   // the stack limit to the top of the stack. We cache the stack limit address
   // in the Dart SP register, which is callee-saved in the C ABI.
-  __ mov(R26, CSP);
+  __ mov(R25, CSP);
   __ mov(CSP, SP);
 
   __ mov(R1, R5);  // Pass the function entrypoint to call.
 
   // Call native function invocation wrapper or redirection via simulator.
   __ ldr(LR, Address(THR, Thread::native_call_wrapper_entry_point_offset()));
   __ blr(LR);
 
   // Restore SP and CSP.
   __ mov(SP, CSP);
-  __ mov(CSP, R26);
+  __ mov(CSP, R25);
 
   // Mark that the thread is executing Dart code.
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
 
   __ LeaveStubFrame();
   __ ret();
@@ skipping 61 matching lines @@
   // For now, space is reserved on the stack and we pass a pointer to it.
   __ StoreToOffset(R0, SP, thread_offset);
   __ StoreToOffset(R1, SP, argc_tag_offset);
   __ StoreToOffset(R2, SP, argv_offset);
   __ StoreToOffset(R3, SP, retval_offset);
   __ mov(R0, SP);  // Pass the pointer to the NativeArguments.
 
   // We are entering runtime code, so the C stack pointer must be restored from
   // the stack limit to the top of the stack. We cache the stack limit address
   // in the Dart SP register, which is callee-saved in the C ABI.
-  __ mov(R26, CSP);
+  __ mov(R25, CSP);
   __ mov(CSP, SP);
 
   // Call native function or redirection via simulator.
   __ blr(R5);
 
   // Restore SP and CSP.
   __ mov(SP, CSP);
-  __ mov(CSP, R26);
+  __ mov(CSP, R25);
 
   // Mark that the thread is executing Dart code.
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
 
   __ LeaveStubFrame();
   __ ret();
@@ skipping 1870 matching lines @@
   __ Bind(&miss);
   __ LoadIsolate(R2);
   __ ldr(CODE_REG, Address(R2, Isolate::ic_miss_code_offset()));
   __ ldr(R1, FieldAddress(CODE_REG, Code::entry_point_offset()));
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64