[runtime] [proxy] Implementing [[Call]]

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index 357a70db5b97452c2972c8188f24cd9088c942c6..59b5e228d65c3475b31cfddc1065c5d32c24e250 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -1686,8 +1686,14 @@ void Builtins::Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode) {
           RelocInfo::CODE_TARGET, eq, t2, Operand(JS_FUNCTION_TYPE));
   __ Branch(&non_function, ne, t2, Operand(JS_PROXY_TYPE));
 
-  // 1. Call to function proxy.
-  // TODO(neis): Implement [[Call]] on proxies.
+  // 1. Runtime fallback for Proxy [[Call]].
+  __ Push(a1);
+  // Increase the arguments size to include the pushed function and the
+  // existing receiver on the stack.
+  __ Daddu(a0, a0, 2);
+  // Tail-call to the runtime.
+  __ JumpToExternalReference(
+      ExternalReference(Runtime::kJSProxyCall, masm->isolate()));
 
   // 2. Call to something else, which might have a [[Call]] internal method (if
   // not we raise an exception).