Add data_variable_at_address and fixed the type propagation issue in riscv

Author: river-li

arch/riscv/src/lib.rs

@@ -2865,9 +2865,17 @@ impl FunctionRecognizer for RiscVELFPLTRecognizer {
 
         let func_sym =
             Symbol::imported_function_from_import_address_symbol(sym.as_ref(), func.start());
+
         bv.define_auto_symbol(func_sym.as_ref());
-        func.apply_imported_types(func_sym.as_ref(), None);
-        true
+        for ext_sym in &bv.symbols_by_name(func_sym.raw_name()) {
+            if ext_sym.sym_type() == SymbolType::External {
+                if let Some(var) = bv.data_variable_at_address(ext_sym.address()) {
+                    func.apply_imported_types(func_sym.as_ref(), Some(var.t()));
+                    return true;
+                }
+            }
+        }
+        false
     }
 }
 

rust/src/binaryview.rs

@@ -564,6 +564,17 @@ pub trait BinaryViewExt: BinaryViewBase {
         }
     }
 
+    fn data_variable_at_address(&self, addr: u64) -> Option<Ref<DataVariable>> {
+        let dv = BNDataVariable::default();
+        unsafe {
+            if BNGetDataVariableAtAddress(self.as_ref().handle, addr, std::mem::transmute(&dv)) {
+                Some(DataVariable(dv).to_owned())
+            } else {
+                None
+            }
+        }
+    }
+
     fn define_auto_data_var<'a, T: Into<Conf<&'a Type>>>(&self, addr: u64, ty: T) {
         unsafe {
             BNDefineDataVariable(self.as_ref().handle, addr, &mut ty.into().into());