Begins work on ARM64, first assembler test.

runtime/vm/os_linux.cc

 // Copyright (c) 2012, 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_OS_LINUX)
 
 #include "vm/os.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 41 matching lines @@
       return;
     }
     const char* filename = "v8.log.ll";
     log_file_ = (*file_open)(filename, true);
 #if defined(TARGET_ARCH_IA32)
     const char arch[] = "ia32";
 #elif defined(TARGET_ARCH_X64)
     const char arch[] = "x64";
 #elif defined(TARGET_ARCH_ARM)
     const char arch[] = "arm";
+#elif defined(TARGET_ARCH_ARM64)
+    const char arch[] = "arm64";
 #elif defined(TARGET_ARCH_MIPS)
     const char arch[] = "mips";
 #else
 #error Unknown architecture.
 #endif
     LowLevelLogWriteBytes(arch, sizeof(arch));
   }
 
   ~LowLevelProfileCodeObserver() {
     Dart_FileCloseCallback file_close = Isolate::file_close_callback();
@@ skipping 276 matching lines @@
                       bool optimized) {
     WriteCodeLoad(name, base, prologue_offset, size, optimized);
   }
 
  private:
   static const uint32_t kJitHeaderMagic = 0x4F74496A;
   static const uint32_t kJitHeaderVersion = 0x2;
   static const uint32_t kElfMachIA32 = 3;
   static const uint32_t kElfMachX64 = 62;
   static const uint32_t kElfMachARM = 40;
+  // TODO(zra): Find the right ARM64 constant.
+  static const uint32_t kElfMachARM64 = 40;
   static const uint32_t kElfMachMIPS = 10;
   static const int kInvalidClockId = -1;
 
   struct jitheader {
     uint32_t magic;
     uint32_t version;
     uint32_t total_size;
     uint32_t elf_mach;
     uint32_t pad1;
     uint32_t pid;
@@ skipping 30 matching lines @@
     return buffer;
   }
 
   uint32_t GetElfMach() {
 #if defined(TARGET_ARCH_IA32)
     return kElfMachIA32;
 #elif defined(TARGET_ARCH_X64)
     return kElfMachX64;
 #elif defined(TARGET_ARCH_ARM)
     return kElfMachARM;
+#elif defined(TARGET_ARCH_ARM64)
+    return kElfMachARM64;
 #elif defined(TARGET_ARCH_MIPS)
     return kElfMachMIPS;
 #else
 #error Unknown architecture.
 #endif
   }
 
   pid_t gettid() {
     // libc doesn't wrap the Linux-specific gettid system call.
     // Note that this thread id is not the same as the posix thread id.
@@ skipping 145 matching lines @@
 
 
 void OS::AlignedFree(void* ptr) {
   free(ptr);
 }
 
 
 // TODO(5411554):  May need to hoist these architecture dependent code
 // into a architecture specific file e.g: os_ia32_linux.cc
 word OS::ActivationFrameAlignment() {
-#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
+#if defined(TARGET_ARCH_IA32) ||                                               \
+    defined(TARGET_ARCH_X64) ||                                                \
+    defined(TARGET_ARCH_ARM64)
   const int kMinimumAlignment = 16;
 #elif defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_MIPS)
   const int kMinimumAlignment = 8;
 #else
 #error Unsupported architecture.
 #endif
   word alignment = kMinimumAlignment;
   // TODO(5411554): Allow overriding default stack alignment for
   // testing purposes.
   // Flags::DebugIsInt("stackalign", &alignment);
   ASSERT(Utils::IsPowerOfTwo(alignment));
   ASSERT(alignment >= kMinimumAlignment);
   return alignment;
 }
 
 
 word OS::PreferredCodeAlignment() {
-#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
+#if defined(TARGET_ARCH_IA32) ||                                               \
+    defined(TARGET_ARCH_X64) ||                                                \
+    defined(TARGET_ARCH_ARM64)
   const int kMinimumAlignment = 32;
 #elif defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_MIPS)
   const int kMinimumAlignment = 16;
 #else
 #error Unsupported architecture.
 #endif
   word alignment = kMinimumAlignment;
   // TODO(5411554): Allow overriding default code alignment for
   // testing purposes.
   // Flags::DebugIsInt("codealign", &alignment);
@@ skipping 167 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)