Index: llvm/include/llvm/BinaryFormat/MachO.h
===================================================================
--- llvm/include/llvm/BinaryFormat/MachO.h
+++ llvm/include/llvm/BinaryFormat/MachO.h
@@ -50,7 +50,8 @@
   MH_BUNDLE = 0x8u,
   MH_DYLIB_STUB = 0x9u,
   MH_DSYM = 0xAu,
-  MH_KEXT_BUNDLE = 0xBu
+  MH_KEXT_BUNDLE = 0xBu,
+  MH_FILESET = 0xCu
 };
 
 enum {
Index: llvm/include/llvm/BinaryFormat/Magic.h
===================================================================
--- llvm/include/llvm/BinaryFormat/Magic.h
+++ llvm/include/llvm/BinaryFormat/Magic.h
@@ -40,6 +40,7 @@
     macho_dsym_companion,                     ///< Mach-O dSYM companion file
     macho_kext_bundle,                        ///< Mach-O kext bundle file
     macho_universal_binary,                   ///< Mach-O universal binary
+    macho_file_set,                           ///< Mach-O file set binary
     minidump,                                 ///< Windows minidump file
     coff_cl_gl_object,   ///< Microsoft cl.exe's intermediate code file
     coff_object,         ///< COFF object file
Index: llvm/lib/BinaryFormat/Magic.cpp
===================================================================
--- llvm/lib/BinaryFormat/Magic.cpp
+++ llvm/lib/BinaryFormat/Magic.cpp
@@ -182,6 +182,8 @@
       return file_magic::macho_dsym_companion;
     case 11:
       return file_magic::macho_kext_bundle;
+    case 12:
+      return file_magic::macho_file_set;
     }
     break;
   }
Index: llvm/lib/Object/Binary.cpp
===================================================================
--- llvm/lib/Object/Binary.cpp
+++ llvm/lib/Object/Binary.cpp
@@ -67,6 +67,7 @@
   case file_magic::macho_dynamically_linked_shared_lib_stub:
   case file_magic::macho_dsym_companion:
   case file_magic::macho_kext_bundle:
+  case file_magic::macho_file_set:
   case file_magic::coff_object:
   case file_magic::coff_import_library:
   case file_magic::pecoff_executable:
Index: llvm/lib/Object/ObjectFile.cpp
===================================================================
--- llvm/lib/Object/ObjectFile.cpp
+++ llvm/lib/Object/ObjectFile.cpp
@@ -169,6 +169,7 @@
   case file_magic::macho_dynamically_linked_shared_lib_stub:
   case file_magic::macho_dsym_companion:
   case file_magic::macho_kext_bundle:
+  case file_magic::macho_file_set:
     return createMachOObjectFile(Object);
   case file_magic::coff_object:
   case file_magic::coff_import_library:
Index: llvm/lib/Object/SymbolicFile.cpp
===================================================================
--- llvm/lib/Object/SymbolicFile.cpp
+++ llvm/lib/Object/SymbolicFile.cpp
@@ -63,6 +63,7 @@
   case file_magic::macho_dynamically_linked_shared_lib_stub:
   case file_magic::macho_dsym_companion:
   case file_magic::macho_kext_bundle:
+  case file_magic::macho_file_set:
   case file_magic::pecoff_executable:
   case file_magic::xcoff_object_32:
   case file_magic::xcoff_object_64:
@@ -113,6 +114,7 @@
   case file_magic::macho_dynamically_linked_shared_lib_stub:
   case file_magic::macho_dsym_companion:
   case file_magic::macho_kext_bundle:
+  case file_magic::macho_file_set:
   case file_magic::pecoff_executable:
   case file_magic::xcoff_object_32:
   case file_magic::xcoff_object_64:
Index: llvm/test/Object/AArch64/filetype-fileset.yaml
===================================================================
--- /dev/null
+++ llvm/test/Object/AArch64/filetype-fileset.yaml
@@ -0,0 +1,18 @@
+# REQUIRES: host-byteorder-little-endian
+# RUN: yaml2obj %s \
+# RUN:   | llvm-objdump --macho --private-header - 2>&1 \
+# RUN:   | FileCheck %s
+
+# CHECK: magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
+# CHECK-NEXT: MH_MAGIC_64 ARM64 ALL 0x00 FILESET 0 0 0x00000000
+
+--- !mach-o
+FileHeader:
+  magic:           0xFEEDFACF
+  cputype:         0x100000C
+  cpusubtype:      0x0
+  filetype:        0xC
+  ncmds:           0
+  sizeofcmds:      0
+  flags:           0x0
+  reserved:        0x0
Index: llvm/tools/llvm-objdump/MachODump.cpp
===================================================================
--- llvm/tools/llvm-objdump/MachODump.cpp
+++ llvm/tools/llvm-objdump/MachODump.cpp
@@ -8492,6 +8492,9 @@
     case MachO::MH_KEXT_BUNDLE:
       outs() << "  KEXTBUNDLE";
       break;
+    case MachO::MH_FILESET:
+      outs() << "     FILESET";
+      break;
     default:
       outs() << format("  %10u", filetype);
       break;