Index: llvm/include/llvm/Object/XCOFFObjectFile.h
===================================================================
--- llvm/include/llvm/Object/XCOFFObjectFile.h
+++ llvm/include/llvm/Object/XCOFFObjectFile.h
@@ -113,7 +113,11 @@
 };
 
 struct XCOFFCsectAuxEnt32 {
-  support::ubig32_t SectionLen;
+  support::ubig32_t
+      SectionOrLength; // If the symbol type is XTY_SD,XTY_CM,it contains the
+                       // csect length. If the symbol type is XTY_LD, it
+                       // contains the symbol table index of the containing
+                       // csect. If the symbol type is  XTY_ER, it contains 0.
   support::ubig32_t ParameterHashIndex;
   support::ubig16_t TypeChkSectNum;
   uint8_t SymbolAlignmentAndType;
Index: llvm/tools/llvm-readobj/XCOFFDumper.cpp
===================================================================
--- llvm/tools/llvm-readobj/XCOFFDumper.cpp
+++ llvm/tools/llvm-readobj/XCOFFDumper.cpp
@@ -213,9 +213,9 @@
   W.printNumber("Index",
                 Obj.getSymbolIndex(reinterpret_cast<uintptr_t>(AuxEntPtr)));
   if ((AuxEntPtr->SymbolAlignmentAndType & SymbolTypeMask) == XCOFF::XTY_LD)
-    W.printNumber("ContainingCsectSymbolIndex", AuxEntPtr->SectionLen);
+    W.printNumber("ContainingCsectSymbolIndex", AuxEntPtr->SectionOrLength);
   else
-    W.printNumber("SectionLen", AuxEntPtr->SectionLen);
+    W.printNumber("SectionLen", AuxEntPtr->SectionOrLength);
   W.printHex("ParameterHashIndex", AuxEntPtr->ParameterHashIndex);
   W.printHex("TypeChkSectNum", AuxEntPtr->TypeChkSectNum);
   // Print out symbol alignment and type.