Index: llvm/trunk/include/llvm/ObjectYAML/ELFYAML.h
===================================================================
--- llvm/trunk/include/llvm/ObjectYAML/ELFYAML.h
+++ llvm/trunk/include/llvm/ObjectYAML/ELFYAML.h
@@ -223,6 +223,7 @@
 
 struct HashSection : Section {
   Optional<yaml::BinaryRef> Content;
+  Optional<llvm::yaml::Hex64> Size;
   Optional<std::vector<uint32_t>> Bucket;
   Optional<std::vector<uint32_t>> Chain;
 
Index: llvm/trunk/lib/ObjectYAML/ELFEmitter.cpp
===================================================================
--- llvm/trunk/lib/ObjectYAML/ELFEmitter.cpp
+++ llvm/trunk/lib/ObjectYAML/ELFEmitter.cpp
@@ -824,8 +824,8 @@
   if (Section.Link.empty() && SN2I.lookup(".dynsym", Link))
     SHeader.sh_link = Link;
 
-  if (Section.Content) {
-    SHeader.sh_size = writeContent(OS, Section.Content, None);
+  if (Section.Content || Section.Size) {
+    SHeader.sh_size = writeContent(OS, Section.Content, Section.Size);
     return;
   }
 
Index: llvm/trunk/lib/ObjectYAML/ELFYAML.cpp
===================================================================
--- llvm/trunk/lib/ObjectYAML/ELFYAML.cpp
+++ llvm/trunk/lib/ObjectYAML/ELFYAML.cpp
@@ -1029,6 +1029,7 @@
   IO.mapOptional("Content", Section.Content);
   IO.mapOptional("Bucket", Section.Bucket);
   IO.mapOptional("Chain", Section.Chain);
+  IO.mapOptional("Size", Section.Size);
 }
 
 static void sectionMapping(IO &IO, ELFYAML::NoBitsSection &Section) {
@@ -1210,14 +1211,20 @@
   }
 
   if (const auto *HS = dyn_cast<ELFYAML::HashSection>(Section.get())) {
-    if (!HS->Content && !HS->Bucket && !HS->Chain)
-      return "one of \"Content\", \"Bucket\" or \"Chain\" must be specified";
+    if (!HS->Content && !HS->Bucket && !HS->Chain && !HS->Size)
+      return "one of \"Content\", \"Size\", \"Bucket\" or \"Chain\" must be "
+             "specified";
+
+    if (HS->Content || HS->Size) {
+      if (HS->Size && HS->Content &&
+          (uint64_t)*HS->Size < HS->Content->binary_size())
+        return "\"Size\" must be greater than or equal to the content "
+               "size";
 
-    if (HS->Content) {
       if (HS->Bucket)
-        return "\"Content\" and \"Bucket\" cannot be used together";
+        return "\"Bucket\" cannot be used with \"Content\" or \"Size\"";
       if (HS->Chain)
-        return "\"Content\" and \"Chain\" cannot be used together";
+        return "\"Chain\" cannot be used with \"Content\" or \"Size\"";
       return {};
     }
 
Index: llvm/trunk/test/tools/yaml2obj/elf-hash-section.yaml
===================================================================
--- llvm/trunk/test/tools/yaml2obj/elf-hash-section.yaml
+++ llvm/trunk/test/tools/yaml2obj/elf-hash-section.yaml
@@ -66,7 +66,7 @@
 
 # RUN: not yaml2obj --docnum=3 %s 2>&1 | FileCheck %s --check-prefix=CONTENT-BUCKET
 
-# CONTENT-BUCKET: error: "Content" and "Bucket" cannot be used together
+# CONTENT-BUCKET: "Bucket" cannot be used with "Content" or "Size"
 
 --- !ELF
 FileHeader:
@@ -84,7 +84,7 @@
 
 # RUN: not yaml2obj --docnum=4 %s 2>&1 | FileCheck %s --check-prefix=CONTENT-CHAIN
 
-# CONTENT-CHAIN: error: "Content" and "Chain" cannot be used together
+# CONTENT-CHAIN: "Chain" cannot be used with "Content" or "Size"
 
 --- !ELF
 FileHeader:
@@ -134,7 +134,7 @@
 
 # RUN: not yaml2obj --docnum=7 %s 2>&1 | FileCheck %s --check-prefix=NO-TAGS
 
-# NO-TAGS: error: one of "Content", "Bucket" or "Chain" must be specified
+# NO-TAGS: error: one of "Content", "Size", "Bucket" or "Chain" must be specified
 
 --- !ELF
 FileHeader:
@@ -177,3 +177,102 @@
 ## SHT_HASH is linked to dynamic symbol table by default if it exists.
   - Name: .dynsym
     Type: SHT_DYNSYM
+
+## Check we can use only "Size" to create a SHT_HASH section.
+
+# RUN: yaml2obj --docnum=9 %s -o %t9
+# RUN: llvm-readobj --sections --section-data %t9 | FileCheck %s --check-prefix=SIZE
+
+# SIZE:      Name: .hash
+# SIZE:      Size:
+# SIZE-SAME: 17
+# SIZE:      SectionData (
+# SIZE-NEXT:  0000: 00000000 00000000 00000000 00000000  |
+# SIZE-NEXT:  0010: 00                                   |
+# SIZE-NEXT: )
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_EXEC
+  Machine: EM_X86_64
+Sections:
+  - Name: .hash
+    Type: SHT_HASH
+    Size: 0x11
+
+## Check we can use "Size" and "Content" together to create a SHT_HASH section.
+
+# RUN: yaml2obj --docnum=10 %s -o %t10
+# RUN: llvm-readobj --sections --section-data %t10 | FileCheck %s --check-prefix=SIZE-CONTENT
+
+# SIZE-CONTENT:      Name: .hash
+# SIZE-CONTENT:      Size:
+# SIZE-CONTENT-SAME: 5
+# SIZE-CONTENT:      SectionData (
+# SIZE-CONTENT-NEXT:  0000: 11223300 00 |
+# SIZE-CONTENT-NEXT: )
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_EXEC
+  Machine: EM_X86_64
+Sections:
+  - Name: .hash
+    Type: SHT_HASH
+    Size: 0x5
+    Content: "112233"
+
+## Check that when "Size" and "Content" are used together, the size
+## must be greater than or equal to the content size.
+
+# RUN: not yaml2obj --docnum=11 %s 2>&1 | FileCheck %s --check-prefix=SIZE-CONTENT-ERR
+
+# SIZE-CONTENT-ERR: error: "Size" must be greater than or equal to the content size
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_EXEC
+  Machine: EM_X86_64
+Sections:
+  - Name: .hash
+    Type: SHT_HASH
+    Size: 0x1
+    Content: "1122"
+
+## Check we can't use "Size" and "Bucket" tags together.
+
+# RUN: not yaml2obj --docnum=12 %s 2>&1 | FileCheck %s --check-prefix=CONTENT-BUCKET
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_EXEC
+  Machine: EM_X86_64
+Sections:
+  - Name: .hash
+    Type: SHT_HASH
+    Size: 0x1
+    Bucket: [ 1 ]
+
+## Check we can't use "Size" and "Chain" tags together.
+
+# RUN: not yaml2obj --docnum=13 %s 2>&1 | FileCheck %s --check-prefix=CONTENT-CHAIN
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_EXEC
+  Machine: EM_X86_64
+Sections:
+  - Name: .hash
+    Type: SHT_HASH
+    Size: 0x1
+    Chain: [ 1 ]