Update PAL to support Apple Silicon

- Some material brought in from PAL at github.com/dotnet/
- Various manual changes to fit with existing codebase
- Updated licensing in edited files, latest PAL is copyright .dotNet
- Updated copyright  check scripts to check pal/ files for new text

THIRD-PARTY-NOTICES.txt

@@ -1,19 +1,21 @@
 ChakraCore uses third party material from the projects listed below.
 The original copyright notice and the license under which Microsoft
-received such third party material are set forth below. Microsoft
-reserves all other rights not expressly granted, whether by
+or the ChakraCore Project Contributors received such third party material
+are set forth below. Microsoft, and where relevant the  ChakraCore Project
+Contributors reserve all other rights not expressly granted, whether by
 implication, estoppel or otherwise.
 
 In the event that we accidentally failed to list a required notice, please
-bring it to our attention. Post an issue or email us: [email protected]
+bring it to our attention. Post an issue or message us on discord.
 
 THIRD-PARTY SOFTWARE NOTICES AND INFORMATION
 Do Not Translate or Localize
 
 ChakraCore incorporates third party material from the projects listed below.
-The original copyright notice and the license under which Microsoft received
-such third party material are set forth below. Microsoft reserves all other
-rights not expressly granted, whether by implication, estoppel or otherwise.
+The original copyright notice and the license under which Microsoft or the
+ChakraCore Project Contributors received such third party material are set
+forth below. Microsoft, and where relevant the  ChakraCore Project Contributors
+reserve all other rights not expressly granted, whether by implication, estoppel or otherwise.
 
 1.   backbone.suggestions (https://github.com/qloo/backbone.suggestions)
 2.   BeatDetektor.js
@@ -48,6 +50,7 @@ rights not expressly granted, whether by implication, estoppel or otherwise.
 31.  yargs-parser.js (https://github.com/yargs/yargs-parser)
 32.  camelcase.js (https://github.com/sindresorhus/camelcase)
 33.  ARES-6 (https://github.com/WebKit/webkit/tree/master/PerformanceTests/ARES-6)
+34.  PAL (from dotNet)
 
 %% backbone.suggestions NOTICES, INFORMATION, AND LICENSE BEGIN HERE
 =========================================
@@ -2041,3 +2044,30 @@ END OF ARES-6 NOTICES, INFORMATION, AND LICENSE
 
 ---------------------------------------------
 
+%% PAL NOTICES, INFORMATION AND LICENSE BEGIN HERE
+=========================================
+The MIT License (MIT)
+
+Copyright (c) .NET Foundation and Contributors
+
+All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+=========================================
+END OF PAL NOTICES, INFORMATION, AND LICENSE

pal/inc/cclock.hpp

@@ -1,12 +1,21 @@
 //-------------------------------------------------------------------------------------------------------
-// Copyright (C) Microsoft. All rights reserved.
+// ChakraCore/Pal
+// Contains portions (c) copyright Microsoft, portions copyright (c) the .NET Foundation and Contributors
+// and edits (c) copyright the ChakraCore Contributors.
+// See THIRD-PARTY-NOTICES.txt in the project root for .NET Foundation license
 // Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
 //-------------------------------------------------------------------------------------------------------
 
 #ifndef CC_PAL_INC_CCLOCK_H
 #define CC_PAL_INC_CCLOCK_H
 
-class CCLock
+#if defined(_M_ARM64)
+#define CCLOCK_ALIGN __declspec(align(8))
+#else
+#define CCLOCK_ALIGN
+#endif
+
+class CCLOCK_ALIGN CCLock
 {
     char           mutexPtr[64]; // keep mutex implementation opaque to consumer (PAL vs non-PAL)
 

pal/inc/pal.h

@@ -1,8 +1,10 @@
-//
-// Copyright (c) Microsoft. All rights reserved.
-// Licensed under the MIT license. See LICENSE file in the project root for full license information.
-//
-
+//-------------------------------------------------------------------------------------------------------
+// ChakraCore/Pal
+// Contains portions (c) copyright Microsoft, portions copyright (c) the .NET Foundation and Contributors
+// and edits (c) copyright the ChakraCore Contributors.
+// See THIRD-PARTY-NOTICES.txt in the project root for .NET Foundation license
+// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
+//-------------------------------------------------------------------------------------------------------
 /*++
 
 Module Name:
@@ -2907,6 +2909,7 @@ typedef struct _IMAGE_ARM_RUNTIME_FUNCTION_ENTRY {
 
 #define CONTEXT_CONTROL (CONTEXT_ARM64 | 0x1L)
 #define CONTEXT_INTEGER (CONTEXT_ARM64 | 0x2L)
+#define CONTEXT_SEGMENTS (CONTEXT_ARM64 | 0x4L)
 #define CONTEXT_FLOATING_POINT  (CONTEXT_ARM64 | 0x4L)
 #define CONTEXT_DEBUG_REGISTERS (CONTEXT_ARM64 | 0x8L)
 
@@ -3190,6 +3193,8 @@ PALIMPORT BOOL PALAPI PAL_VirtualUnwindOutOfProc(CONTEXT *context,
 #define PAL_CS_NATIVE_DATA_SIZE 76
 #elif defined(__APPLE__) && defined(__x86_64__)
 #define PAL_CS_NATIVE_DATA_SIZE 120
+#elif defined(__APPLE__) && defined(_ARM64_)
+#define PAL_CS_NATIVE_DATA_SIZE 120
 #elif defined(__LINUX__) && defined(__i386__)
 #define PAL_CS_NATIVE_DATA_SIZE 56
 #elif defined(__LINUX__) && defined(__x86_64__)
@@ -4713,11 +4718,29 @@ enum {
 //
 // A function table entry is generated for each frame function.
 //
+#ifdef _M_ARM64
+typedef struct _RUNTIME_FUNCTION {
+    DWORD BeginAddress;
+    union {
+        DWORD UnwindData;
+        struct {
+            DWORD Flag           : 2;
+            DWORD FunctionLength : 11;
+            DWORD RegF           : 3;
+            DWORD RegI           : 4;
+            DWORD H              : 1;
+            DWORD CR             : 2;
+            DWORD FrameSize      : 9;
+        };
+    };
+} RUNTIME_FUNCTION, *PRUNTIME_FUNCTION;
+#else
 typedef struct _RUNTIME_FUNCTION {
     DWORD BeginAddress;
     DWORD EndAddress;
     DWORD UnwindData;
 } RUNTIME_FUNCTION, *PRUNTIME_FUNCTION;
+#endif
 
 PALIMPORT
 BOOL
@@ -5810,11 +5833,6 @@ RtlCaptureContext(
   OUT PCONTEXT ContextRecord
 );
 
-PALIMPORT
-VOID
-PALAPI
-FlushProcessWriteBuffers();
-
 typedef void (*PAL_ActivationFunction)(CONTEXT *context);
 typedef BOOL (*PAL_SafeActivationCheckFunction)(SIZE_T ip, BOOL checkingCurrentThread);
 
@@ -5825,13 +5843,6 @@ PAL_SetActivationFunction(
     IN PAL_ActivationFunction pActivationFunction,
     IN PAL_SafeActivationCheckFunction pSafeActivationCheckFunction);
 
-PALIMPORT
-BOOL
-PALAPI
-PAL_InjectActivation(
-    IN HANDLE hThread
-);
-
 #define VER_PLATFORM_WIN32_WINDOWS        1
 #define VER_PLATFORM_WIN32_NT        2
 #define VER_PLATFORM_UNIX            10