runtime: run TestVectoredHandlerDontCrashOnLibrary on 386 and arm64

This CL updates TestVectoredHandlerDontCrashOnLibrary so it can run on
windows/386 and windows/arm64. It still can't run on windows/arm as
it does not support c-shared buildmode (see #43800).

Change-Id: Id1577687e165e77d27633c632634ecf86e6e9d6f
Reviewed-on: https://go-review.googlesource.com/c/go/+/463117


Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

src/runtime/signal_windows_test.go

@@ -79,8 +79,11 @@ func TestVectoredHandlerDontCrashOnLibrary(t *testing.T) {
 	if *flagQuick {
 		t.Skip("-quick")
 	}
-	if runtime.GOARCH != "amd64" {
-		t.Skip("this test can only run on windows/amd64")
+	if runtime.GOARCH == "arm" {
+		//TODO: remove this skip and update testwinlib/main.c
+		// once windows/arm supports c-shared buildmode.
+		// See go.dev/issues/43800.
+		t.Skip("this test can't run on windows/arm")
 	}
 	testenv.MustHaveGoBuild(t)
 	testenv.MustHaveCGO(t)

src/runtime/testdata/testwinlib/main.c

@@ -11,8 +11,15 @@ LONG WINAPI customExceptionHandlder(struct _EXCEPTION_POINTERS *ExceptionInfo)
         exceptionCount++;
         // prepare context to resume execution
         CONTEXT *c = ExceptionInfo->ContextRecord;
-        c->Rip = *(ULONG_PTR *)c->Rsp;
+#ifdef _AMD64_
+        c->Rip = *(DWORD64 *)c->Rsp;
         c->Rsp += 8;
+#elif defined(_X86_)
+        c->Eip = *(DWORD *)c->Esp;
+        c->Esp += 4;
+#else
+        c->Pc = c->Lr;
+#endif
         return EXCEPTION_CONTINUE_EXECUTION;
     }
     return EXCEPTION_CONTINUE_SEARCH;