ci: add arm64 build

.github/workflows/build.yml

@@ -34,6 +34,18 @@ jobs:
           cmake -B cmake-build-stacks -D CRASHPAD_ENABLE_STACKTRACE=ON
           cmake --build cmake-build-stacks --parallel
 
+      - name: Build crashpad Windows ARM64
+        if: ${{ runner.os == 'Windows' }}
+        run: |
+          cmake -B cmake-build-arm64 -DCMAKE_TOOLCHAIN_FILE="cmake/toolchains/win_arm64.cmake" -DCRASHPAD_BUILD_TOOLS=On
+          cmake --build cmake-build-arm64 --config RelWithDebInfo -- /p:Platform=ARM64
+
+      - name: Build crashpad with client-side stack traces Windows ARM64
+        if: ${{ runner.os == 'Windows' }}
+        run: |
+          cmake -B cmake-build-stacks-arm64 -DCMAKE_TOOLCHAIN_FILE="cmake/toolchains/win_arm64.cmake" -DCRASHPAD_ENABLE_STACKTRACE=ON
+          cmake --build cmake-build-stacks-arm64 --config RelWithDebInfo -- /p:Platform=ARM64
+
   build-ios:
     runs-on: macos-latest
     steps:

CMakeLists.txt

@@ -50,7 +50,7 @@ function(crashpad_install_dev)
 endfunction()
 
 if(WIN32)
-    if(CMAKE_SYSTEM_PROCESSOR MATCHES ARM64)
+    if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES ARM64)
         enable_language(ASM_MARMASM)
     else()
         enable_language(ASM_MASM)

cmake/toolchains/win_arm64.cmake

@@ -0,0 +1,6 @@
+# Toolchain file that should provide required and non-conflicting build-
+# parameters to allow normal and cross-compilation to ARM64 targets on 
+# Windows using any generator.
+SET(CMAKE_GENERATOR_PLATFORM "ARM64")
+SET(CMAKE_SYSTEM_PROCESSOR "ARM64")
+SET(CMAKE_SYSTEM_NAME "Windows")

snapshot/win/process_reader_win.cc

@@ -174,9 +174,12 @@ void DoStackWalk(ProcessReaderWin::Thread* thread,
   //   ctx = (LPVOID)ctx_;
   // }
 
-// TODO: we dont support this right away, maybe in the future
-// #elif defined(ARCH_CPU_ARM64)
-//  machine_type = IMAGE_FILE_MACHINE_ARM64;
+#elif defined(ARCH_CPU_ARM64)
+  machine_type = IMAGE_FILE_MACHINE_ARM64;
+  ctx = *thread->context.context<CONTEXT>();
+  stack_frame.AddrPC.Offset = ctx.Pc;
+  stack_frame.AddrFrame.Offset = ctx.Fp;
+  stack_frame.AddrStack.Offset = ctx.Sp;
 #else
 #error Unsupported Windows Arch
 #endif  // ARCH_CPU_X86

util/CMakeLists.txt

@@ -385,7 +385,7 @@ if(WIN32)
         win/traits.h
         win/xp_compat.h
     )
-    if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm|ARM64")
+    if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm|ARM64")
         target_sources(crashpad_util PRIVATE
             misc/capture_context_win_arm64.asm
         )