chore: add windows arm64 CI runner

.github/workflows/ci.yml

@@ -168,6 +168,8 @@ jobs:
             TEST_X86: 1
           - name: Windows (latest)
             os: windows-latest
+          - name: Windows arm64
+            os: windows-11-arm
           - name: Windows (latest, UTF-8 paths)
             os: windows-latest
             UTF8_TEST_CWD: 1

src/backends/sentry_backend_inproc.c

@@ -445,8 +445,47 @@ registers_from_uctx(const sentry_ucontext_t *uctx)
         SET_REG("esp", Esp);
     }
 
-#    else
-    // _ARM64_
+#    elif defined(_M_ARM64)
+
+    if (ctx->ContextFlags & CONTEXT_INTEGER) {
+        SET_REG("x0", X0);
+        SET_REG("x1", X1);
+        SET_REG("x2", X2);
+        SET_REG("x3", X3);
+        SET_REG("x4", X4);
+        SET_REG("x5", X5);
+        SET_REG("x6", X6);
+        SET_REG("x7", X7);
+        SET_REG("x8", X8);
+        SET_REG("x9", X9);
+        SET_REG("x10", X10);
+        SET_REG("x11", X11);
+        SET_REG("x12", X12);
+        SET_REG("x13", X13);
+        SET_REG("x14", X14);
+        SET_REG("x15", X15);
+        SET_REG("x16", X16);
+        SET_REG("x17", X17);
+        // x18 is reserved as platform register on Windows
+        SET_REG("x19", X19);
+        SET_REG("x20", X20);
+        SET_REG("x21", X21);
+        SET_REG("x22", X22);
+        SET_REG("x23", X23);
+        SET_REG("x24", X24);
+        SET_REG("x25", X25);
+        SET_REG("x26", X26);
+        SET_REG("x27", X27);
+        SET_REG("x28", X28);
+    }
+
+    if (ctx->ContextFlags & CONTEXT_CONTROL) {
+        SET_REG("fp", Fp);
+        SET_REG("lr", Lr);
+        SET_REG("sp", Sp);
+        SET_REG("pc", Pc);
+    }
+
 #    endif
 
 #    undef SET_REG

tests/requirements.txt

@@ -3,7 +3,8 @@ pytest==8.1.1
 pytest-httpserver==1.0.10
 msgpack==1.0.8
 pytest-xdist==3.5.0
-clang-format==19.1.3
+clang-format==20.1.5
 pywin32==308; sys_platform == "win32"
-mitmproxy==11.0.0
+# mitmproxy requires OpenSSL to build on Windows ARM64, skip it there
+mitmproxy==11.0.0; platform_machine != "ARM64"
 psutil==7.1.1

tests/test_build_static.py

@@ -28,11 +28,13 @@ def test_static_lib(cmake):
             binary.seek(offset, 0)
             magic = binary.read(6)
             # https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#signature-image-only
-            assert magic == (
-                b"PE\x00\x00\x4c\x01"
-                if os.environ.get("TEST_X86")
-                else b"PE\x00\x00\x64\x86"
-            )
+            if os.environ.get("TEST_X86"):
+                expected = b"PE\x00\x00\x4c\x01"  # IMAGE_FILE_MACHINE_I386
+            elif os.environ.get("PROCESSOR_ARCHITECTURE") == "ARM64":
+                expected = b"PE\x00\x00\x64\xaa"  # IMAGE_FILE_MACHINE_ARM64
+            else:
+                expected = b"PE\x00\x00\x64\x86"  # IMAGE_FILE_MACHINE_AMD64
+            assert magic == expected
     # similarly, we use `file` on linux
     if sys.platform == "linux":
         output = subprocess.check_output(