Index: tools/llvm-readobj/MachODumper.cpp
===================================================================
--- tools/llvm-readobj/MachODumper.cpp
+++ tools/llvm-readobj/MachODumper.cpp
@@ -39,6 +39,9 @@
   void printUnwindInfo() override;
 
 private:
+  template<class MachHeader>
+  void printFileHeaders(const MachHeader &Header);
+
   void printSymbol(const SymbolRef &Symbol);
 
   void printRelocation(const RelocationRef &Reloc);
@@ -205,7 +208,23 @@
 }
 
 void MachODumper::printFileHeaders() {
-  W.startLine() << "FileHeaders not implemented.\n";
+  if (!Obj->is64Bit()) {
+    printFileHeaders(Obj->getHeader());
+  } else {
+    printFileHeaders(Obj->getHeader64());
+  }
+}
+
+template<class MachHeader>
+void MachODumper::printFileHeaders(const MachHeader &Header) {
+  DictScope H(W, "MachHeader");
+  W.printHex("Magic", Header.magic);
+  W.printNumber("CpuType", Header.cputype);
+  W.printNumber("CpuSubtype", Header.cpusubtype);
+  W.printNumber("FileType", Header.filetype);
+  W.printNumber("NumOfCommands", Header.ncmds);
+  W.printNumber("SizeOfCommands", Header.sizeofcmds);
+  W.printHex("Flags", Header.flags);
 }
 
 void MachODumper::printSections() {