ntdll: Implement RtlVirtualUnwind for ARM64EC.

dlls/ntdll/ntdll_misc.h

@@ -84,6 +84,11 @@ extern void WINAPI KiUserCallbackDispatcher(ULONG,void*,ULONG);
 extern void WINAPI KiUserCallbackDispatcherReturn(void);
 extern void (WINAPI *pWow64PrepareForException)( EXCEPTION_RECORD *rec, CONTEXT *context );
 
+#ifdef __arm64ec__
+extern void context_x64_to_arm( ARM64_NT_CONTEXT *arm_ctx, const CONTEXT *ctx );
+extern void context_arm_to_x64( CONTEXT *ctx, const ARM64_NT_CONTEXT *arm_ctx );
+#endif
+
 /* debug helpers */
 extern LPCSTR debugstr_us( const UNICODE_STRING *str );
 extern const char *debugstr_exception_code( DWORD code );

dlls/ntdll/signal_arm64ec.c

@@ -130,7 +130,7 @@ static UINT fpcsr_to_mxcsr( UINT fpcr, UINT fpsr )
     return ret;
 }
 
-static void context_x64_to_arm( ARM64_NT_CONTEXT *arm_ctx, const CONTEXT *ctx )
+void context_x64_to_arm( ARM64_NT_CONTEXT *arm_ctx, const CONTEXT *ctx )
 {
     ARM64EC_NT_CONTEXT *ec_ctx = (ARM64EC_NT_CONTEXT *)ctx;
     UINT64 fpcsr;
@@ -177,7 +177,7 @@ static void context_x64_to_arm( ARM64_NT_CONTEXT *arm_ctx, const CONTEXT *ctx )
     arm_ctx->Fpsr = fpcsr >> 32;
 }
 
-static void context_arm_to_x64( CONTEXT *ctx, const ARM64_NT_CONTEXT *arm_ctx )
+void context_arm_to_x64( CONTEXT *ctx, const ARM64_NT_CONTEXT *arm_ctx )
 {
     ARM64EC_NT_CONTEXT *ec_ctx = (ARM64EC_NT_CONTEXT *)ctx;
 
@@ -1769,19 +1769,6 @@ void CDECL RtlRestoreContext( CONTEXT *context, EXCEPTION_RECORD *rec )
 }
 
 
-/**********************************************************************
- *              RtlVirtualUnwind   (NTDLL.@)
- */
-PVOID WINAPI RtlVirtualUnwind( ULONG type, ULONG64 base, ULONG64 pc,
-                               RUNTIME_FUNCTION *function, CONTEXT *context,
-                               PVOID *data, ULONG64 *frame_ret,
-                               KNONVOLATILE_CONTEXT_POINTERS *ctx_ptr )
-{
-    FIXME( "not implemented\n" );
-    return NULL;
-}
-
-
 /*******************************************************************
  *		RtlUnwindEx (NTDLL.@)
  */

dlls/ntdll/unwind.c

@@ -1751,6 +1751,20 @@ PVOID WINAPI RtlVirtualUnwind( ULONG type, ULONG64 base, ULONG64 pc,
     unsigned int i, prolog_offset;
     BOOL mach_frame = FALSE;
 
+#ifdef __arm64ec__
+    if (RtlIsEcCode( (void *)pc ))
+    {
+        ARM64_NT_CONTEXT arm_context;
+        void *ret;
+
+        context_x64_to_arm( &arm_context, context );
+        ret = RtlVirtualUnwind_arm64( type, base, pc, (ARM64_RUNTIME_FUNCTION *)function,
+                                      &arm_context, data, frame_ret, NULL );
+        context_arm_to_x64( context, &arm_context );
+        return ret;
+    }
+#endif
+
     TRACE( "type %lx rip %I64x rsp %I64x\n", type, pc, context->Rsp );
     if (TRACE_ON(unwind)) dump_unwind_info( base, function );