Index: llvm/include/llvm/Object/COFF.h
===================================================================
--- llvm/include/llvm/Object/COFF.h
+++ llvm/include/llvm/Object/COFF.h
@@ -888,8 +888,17 @@
   }
 
   uint16_t getMachine() const {
-    if (COFFHeader)
+    if (COFFHeader) {
+      if (CHPEMetadata) {
+        switch (COFFHeader->Machine) {
+        case COFF::IMAGE_FILE_MACHINE_AMD64:
+          return COFF::IMAGE_FILE_MACHINE_ARM64EC;
+        case COFF::IMAGE_FILE_MACHINE_ARM64:
+          return COFF::IMAGE_FILE_MACHINE_ARM64X;
+        }
+      }
       return COFFHeader->Machine;
+    }
     if (COFFBigObjHeader)
       return COFFBigObjHeader->Machine;
     llvm_unreachable("no COFF header!");
Index: llvm/test/tools/llvm-objdump/arm64ec.yaml
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-objdump/arm64ec.yaml
@@ -0,0 +1,73 @@
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-objdump -d %t | FileCheck -check-prefix=DISAS %s
+
+# DISAS: file format coff-arm64ec
+# DISAS:      180001000: 52800040     mov     w0, #0x2
+# DISAS-NEXT: 180001004: d65f03c0     ret
+# DISAS-NEXT: ...
+# DISAS:      180002020: 528000a0     mov     w0, #0x5
+# DISAS-NEXT: 180002024: d65f03c0     ret
+
+--- !COFF
+OptionalHeader:
+  ImageBase:       0x180000000
+  SectionAlignment: 4096
+  FileAlignment:   512
+  DLLCharacteristics: [ ]
+  LoadConfigTable:
+    RelativeVirtualAddress: 0x3000
+    Size:            320
+header:
+  Machine:         IMAGE_FILE_MACHINE_AMD64
+  Characteristics: [ IMAGE_FILE_EXECUTABLE_IMAGE, IMAGE_FILE_LARGE_ADDRESS_AWARE, IMAGE_FILE_DLL ]
+sections:
+  - Name:            .text
+    Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
+    VirtualAddress:  0x1000
+    VirtualSize:     38
+    SectionData:     40008052C0035FD6000000000000000000000000000000000000000000000000B803000000C3
+  - Name:            .test
+    Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
+    VirtualAddress:  0x2000
+    VirtualSize:     40
+    SectionData:     B806000000C3CC00000000000000000000000000000000000000000000000000A0008052C0035FD6
+  - Name:            .rdata
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+    VirtualAddress:  0x3000
+    VirtualSize:     328
+    StructuredData:
+      - LoadConfig:
+          CHPEMetadataPointer: 0x180004000
+  - Name:            .data
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ, IMAGE_SCN_MEM_WRITE ]
+    VirtualAddress:  0x4000
+    VirtualSize:     112
+    StructuredData:
+      - Int32: 1       # Version
+      - Int32: 0x4050  # CodeMap
+      - Int32: 3       # CodeMapCount
+      - Int32: 0       # CodeRangesToEntryPoints
+      - Int32: 0       # RedirectionMetadata
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0       # CodeRangesToEntryPointsCount
+      - Int32: 0       # RedirectionMetadataCount
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0
+      - Int32: 0x1001  # CodeMap[0]
+      - Int32: 0x8
+      - Int32: 0x1022  # CodeMap[1]
+      - Int32: 0x0fe7
+      - Int32: 0x2021  # CodeMap[2]
+      - Int32: 0x8
+symbols:         []
+...