Index: llvm/test/tools/llvm-readobj/elf-section-types.test
===================================================================
--- llvm/test/tools/llvm-readobj/elf-section-types.test
+++ llvm/test/tools/llvm-readobj/elf-section-types.test
@@ -63,14 +63,20 @@
 # LLVM: Type: Unknown (0x1000)
 # LLVM: Name: loos
 # LLVM: Type: Unknown (0x60000000)
+# LLVM: Name: fooos
+# LLVM: Type: Unknown (0x60000F00)
 # LLVM: Name: hios
 # LLVM: Type: SHT_GNU_versym
 # LLVM: Name: loproc
 # LLVM: Type: Unknown (0x70000000)
+# LLVM: Name: fooproc
+# LLVM: Type: Unknown (0x70000F00)
 # LLVM: Name: hiproc
 # LLVM: Type: Unknown (0x7FFFFFFF)
 # LLVM: Name: louser
 # LLVM: Type: Unknown (0x80000000)
+# LLVM: Name: foouser
+# LLVM: Type: Unknown (0x80000F00)
 # LLVM: Name: hiuser
 # LLVM: Type: Unknown (0xFFFFFFFF)
 # LLVM: Name: .symtab
@@ -94,10 +100,8 @@
 # GNU-NEXT: group                   GROUP
 # GNU-NEXT: symtab_shndx            SYMTAB SECTION INDICES
 # GNU-NEXT: relr                    RELR
-## FIXME: These next two lines should print something like ANDROID_REL and ANDROID_RELA.
-## See https://bugs.llvm.org/show_bug.cgi?id=40773.
-# GNU-NEXT: android_rel                      0000000000000000
-# GNU-NEXT: android_rela                     0000000000000000
+# GNU-NEXT: android_rel             LOOS+0x1
+# GNU-NEXT: android_rela            LOOS+0x2
 # GNU-NEXT: android_relr            RELR
 # GNU-NEXT: llvm_odrtab             LLVM_ODRTAB
 # GNU-NEXT: linker_options          LLVM_LINKER_OPTIONS
@@ -107,8 +111,19 @@
 # GNU-NEXT: gnu_hash                GNU_HASH
 # GNU-NEXT: gnu_verdef              VERDEF
 # GNU-NEXT: gnu_verneed             VERNEED
-## TODO: Add testing for unknown section types in GNU output style.
-## See https://bugs.llvm.org/show_bug.cgi?id=40773.
+# GNU-NEXT: unknown                 0x1000: <unknown>
+# GNU_NEXT: loos                    LOOS+0
+# GNU_NEXT: fooos                   LOOS+0xF00
+# GNU_NEXT: hios                    VERSYM
+# GNU_NEXT: loproc                  LOPROC+0
+# GNU_NEXT: fooproc                 LOPROC+0xF00
+# GNU_NEXT: hiproc                  LOPROC+0xFFFFFFF
+# GNU_NEXT: louser                  LOUSER+0
+# GNU_NEXT: fooouser                LOUSER+0xF00
+# GNU_NEXT: hiuser                  LOUSER+0x7FFFFFFF
+# GNU_NEXT: .symtab                 SYMTAB
+# GNU_NEXT: .strtab                 STRTAB
+# GNU_NEXT: .shstrtab               STRTAB
 
 --- !ELF
 FileHeader:
@@ -186,15 +201,21 @@
     Type: 0x1000
   - Name: loos
     Type: 0x60000000
+  - Name: fooos
+    Type: 0x60000F00
   - Name: hios
     Type: 0x6fffffff
     Entries: []
   - Name: loproc
     Type: 0x70000000
+  - Name: fooproc
+    Type: 0x70000F00
   - Name: hiproc
     Type: 0x7fffffff
   - Name: louser
     Type: 0x80000000
+  - Name: foouser
+    Type: 0x80000F00
   - Name: hiuser
     Type: 0xffffffff
 Symbols:
Index: llvm/tools/llvm-readobj/ELFDumper.cpp
===================================================================
--- llvm/tools/llvm-readobj/ELFDumper.cpp
+++ llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -2829,7 +2829,21 @@
     OS << "\nThere are no relocations in this file.\n";
 }
 
-std::string getSectionTypeString(unsigned Arch, unsigned Type) {
+// Print the offset of a particular section from anyone of the ranges:
+// (SHT_LOOS, SHT_HIOS), (SHT_LOPROC, SHT_HIPROC), (SHT_LOUSER, SHT_HIUSER).
+// If 'Type' does not fall within any of those ranges, then a string is
+// returned as '<unknown>' followed by the type value.
+static std::string getSectionTypeOffsetString(unsigned Type) {
+  if (Type > SHT_LOOS && Type < SHT_HIOS)
+    return "LOOS+0x" + to_hexString(Type - SHT_LOOS);
+  else if (Type > SHT_LOPROC && Type < SHT_HIPROC)
+    return "LOPROC+0x" + to_hexString(Type - SHT_LOPROC);
+  else if (Type > SHT_LOUSER && Type < SHT_HIUSER)
+    return "LOUSER+0x" + to_hexString(Type - SHT_LOUSER);
+  return "0x" + to_hexString(Type) + ": <unknown>";
+}
+
+static std::string getSectionTypeString(unsigned Arch, unsigned Type) {
   using namespace ELF;
 
   switch (Arch) {
@@ -2924,8 +2938,18 @@
     return "VERNEED";
   case SHT_GNU_versym:
     return "VERSYM";
+  case SHT_LOOS:
+    return "LOOS+0";
+  case SHT_LOPROC:
+    return "LOPROC+0";
+  case SHT_HIPROC:
+    return "LOPROC+0x" + to_hexString(SHT_HIPROC - SHT_LOPROC);
+  case SHT_LOUSER:
+    return "LOUSER+0";
+  case SHT_HIUSER:
+    return "LOUSER+0x" + to_hexString(SHT_HIUSER - SHT_LOUSER);
   default:
-    return "";
+    return getSectionTypeOffsetString(Type);
   }
   return "";
 }