From: Cary Coutant <ccoutant@gmail.com>
Date: Fri, 22 Jun 2018 16:27:39 +0000 (-0700)
Subject: Add support for .note.gnu.property sections.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6c04fd9b2fb4396c0189cb414ce598161ac8673e;p=binutils-gdb.git

Add support for .note.gnu.property sections.

elfcpp/
	PR gold/22914
	* elfcpp.h (NT_GNU_PROPERTY_TYPE_0): New note type.
	(GNU_PROPERTY_*): New Gnu property types.
	* x86_64.h (GNU_PROPERTY_X86_FEATURE_1_IBT)
	(GNU_PROPERTY_X86_FEATURE_1_SHSTK): New x86 feature bits.

gold/
	PR gold/22914
	* layout.cc (Layout::Layout): Initialize gnu_properties_.
	(read_sized_value, write_sized_value): New functions.
	(Layout::layout_gnu_property): New method.
	(Layout::create_notes): Call create_gnu_properties_note.
	(Layout::create_gnu_properties_note): New method.
	* layout.h (Layout::layout_gnu_property): New method.
	(Layout::create_gnu_properties_note): New method.
	(Layout::Gnu_property, Layout::Gnu_properties): New types.
	(Layout::gnu_properties_): New data member.
	* object.cc (Sized_relobj_file::layout_gnu_property_section): New
	method.
	(Sized_relobj_file::do_layout): Handle .note.gnu.property sections.
	* object.h (Sized_relobj_file::layout_gnu_property_section): New
	method.
	* target.h (Target::merge_gnu_property): New method.
	(Target::do_merge_gnu_property): New virtual method.
	* x86_64.cc (Target_x86_64::do_merge_gnu_property): New method.
	* testsuite/Makefile.am (gnu_property_test): New test case.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/gnu_property_a.S: New source file.
	* testsuite/gnu_property_b.S: New source file.
	* testsuite/gnu_property_c.S: New source file.
	* testsuite/gnu_property_main.c: New source file.
	* testsuite/gnu_property_test.sh: New test script.
---

diff --git a/elfcpp/ChangeLog b/elfcpp/ChangeLog
index 7c4a51423b3..27ca12759c9 100644
--- a/elfcpp/ChangeLog
+++ b/elfcpp/ChangeLog
@@ -1,3 +1,11 @@
+2018-06-22  Cary Coutant  <ccoutant@gmail.com>
+
+	PR gold/22914
+	* elfcpp.h (NT_GNU_PROPERTY_TYPE_0): New note type.
+	(GNU_PROPERTY_*): New Gnu property types.
+	* x86_64.h (GNU_PROPERTY_X86_FEATURE_1_IBT)
+	(GNU_PROPERTY_X86_FEATURE_1_SHSTK): New x86 feature bits.
+
 2018-04-09  Alan Modra  <amodra@gmail.com>
 
 	* powerpc.h (R_POWERPC_PLTSEQ, R_POWERPC_PLTCALL): Define.
diff --git a/elfcpp/elfcpp.h b/elfcpp/elfcpp.h
index 018e0f50da1..ea2e8eab134 100644
--- a/elfcpp/elfcpp.h
+++ b/elfcpp/elfcpp.h
@@ -984,7 +984,9 @@ enum
   NT_GNU_BUILD_ID = 3,
   // The version of gold used to link.  Th descriptor is just a
   // string.
-  NT_GNU_GOLD_VERSION = 4
+  NT_GNU_GOLD_VERSION = 4,
+  // Program property note, as described in "Linux Extensions to the gABI".
+  NT_GNU_PROPERTY_TYPE_0 = 5
 };
 
 // The OS values which may appear in word 0 of a NT_GNU_ABI_TAG note.
@@ -999,6 +1001,21 @@ enum
   ELF_NOTE_OS_SYLLABLE = 5
 };
 
+// Program property types for NT_GNU_PROPERTY_TYPE_0.
+
+enum
+{
+  GNU_PROPERTY_STACK_SIZE = 1,
+  GNU_PROPERTY_NO_COPY_ON_PROTECTED = 2,
+  GNU_PROPERTY_LOPROC = 0xc0000000,
+  GNU_PROPERTY_X86_ISA_1_USED = 0xc0000000,
+  GNU_PROPERTY_X86_ISA_1_NEEDED = 0xc0000001,
+  GNU_PROPERTY_X86_FEATURE_1_AND = 0xc0000002,
+  GNU_PROPERTY_HIPROC = 0xdfffffff,
+  GNU_PROPERTY_LOUSER = 0xe0000000,
+  GNU_PROPERTY_HIUSER = 0xffffffff
+};
+
 } // End namespace elfcpp.
 
 // Include internal details after defining the types.
diff --git a/elfcpp/x86_64.h b/elfcpp/x86_64.h
index a8883dd20ca..0f1dc9af602 100644
--- a/elfcpp/x86_64.h
+++ b/elfcpp/x86_64.h
@@ -103,6 +103,12 @@ enum
   R_X86_64_GNU_VTENTRY = 251
 };
 
+// The bit values that can appear in the GNU_PROPERTY_X86_FEATURE_1_AND
+// program property.
+
+const uint64_t GNU_PROPERTY_X86_FEATURE_1_IBT = 1ULL << 0;
+const uint64_t GNU_PROPERTY_X86_FEATURE_1_SHSTK = 1ULL << 1;
+
 } // End namespace elfcpp.
 
 #endif // !defined(ELFCPP_X86_64_H)
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 9297e6d249b..623eb593f26 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,31 @@
+2018-06-22  Cary Coutant  <ccoutant@gmail.com>
+
+	PR gold/22914
+	* layout.cc (Layout::Layout): Initialize gnu_properties_.
+	(read_sized_value, write_sized_value): New functions.
+	(Layout::layout_gnu_property): New method.
+	(Layout::create_notes): Call create_gnu_properties_note.
+	(Layout::create_gnu_properties_note): New method.
+	* layout.h (Layout::layout_gnu_property): New method.
+	(Layout::create_gnu_properties_note): New method.
+	(Layout::Gnu_property, Layout::Gnu_properties): New types.
+	(Layout::gnu_properties_): New data member.
+	* object.cc (Sized_relobj_file::layout_gnu_property_section): New
+	method.
+	(Sized_relobj_file::do_layout): Handle .note.gnu.property sections.
+	* object.h (Sized_relobj_file::layout_gnu_property_section): New
+	method.
+	* target.h (Target::merge_gnu_property): New method.
+	(Target::do_merge_gnu_property): New virtual method.
+	* x86_64.cc (Target_x86_64::do_merge_gnu_property): New method.
+	* testsuite/Makefile.am (gnu_property_test): New test case.
+	* testsuite/Makefile.in: Regenerate.
+	* testsuite/gnu_property_a.S: New source file.
+	* testsuite/gnu_property_b.S: New source file.
+	* testsuite/gnu_property_c.S: New source file.
+	* testsuite/gnu_property_main.c: New source file.
+	* testsuite/gnu_property_test.sh: New test script.
+
 2018-06-21  Cary Coutant  <ccoutant@gmail.com>
 
 	* resolve.cc (Symbol_table::resolve): Rename tobinding to
diff --git a/gold/layout.cc b/gold/layout.cc
index 2eb7b7c8429..9ce38c3ddef 100644
--- a/gold/layout.cc
+++ b/gold/layout.cc
@@ -474,7 +474,8 @@ Layout::Layout(int number_of_input_files, Script_options* script_options)
     input_section_position_(),
     input_section_glob_(),
     incremental_base_(NULL),
-    free_list_()
+    free_list_(),
+    gnu_properties_()
 {
   // Make space for more than enough segments for a typical file.
   // This is just for efficiency--it's OK if we wind up needing more.
@@ -2193,11 +2194,133 @@ Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags,
     }
 }
 
+// Read a value with given size and endianness.
+
+static inline uint64_t
+read_sized_value(size_t size, const unsigned char* buf, bool is_big_endian,
+		 const Object* object)
+{
+  uint64_t val = 0;
+  if (size == 4)
+    {
+      if (is_big_endian)
+	val = elfcpp::Swap<32, true>::readval(buf);
+      else
+	val = elfcpp::Swap<32, false>::readval(buf);
+    }
+  else if (size == 8)
+    {
+      if (is_big_endian)
+	val = elfcpp::Swap<64, true>::readval(buf);
+      else
+	val = elfcpp::Swap<64, false>::readval(buf);
+    }
+  else
+    {
+      gold_warning(_("%s: in .note.gnu.properties section, "
+		     "pr_datasz must be 4 or 8"),
+		   object->name().c_str());
+    }
+  return val;
+}
+
+// Write a value with given size and endianness.
+
+static inline void
+write_sized_value(uint64_t value, size_t size, unsigned char* buf,
+		  bool is_big_endian)
+{
+  if (size == 4)
+    {
+      if (is_big_endian)
+	elfcpp::Swap<32, true>::writeval(buf, static_cast<uint32_t>(value));
+      else
+	elfcpp::Swap<32, false>::writeval(buf, static_cast<uint32_t>(value));
+    }
+  else if (size == 8)
+    {
+      if (is_big_endian)
+	elfcpp::Swap<64, true>::writeval(buf, value);
+      else
+	elfcpp::Swap<64, false>::writeval(buf, value);
+    }
+  else
+    {
+      // We will have already complained about this.
+    }
+}
+
+// Handle the .note.gnu.property section at layout time.
+
+void
+Layout::layout_gnu_property(unsigned int note_type,
+			    unsigned int pr_type,
+			    size_t pr_datasz,
+			    const unsigned char* pr_data,
+			    const Object* object)
+{
+  // We currently support only the one note type.
+  gold_assert(note_type == elfcpp::NT_GNU_PROPERTY_TYPE_0);
+
+  Gnu_properties::iterator pprop = this->gnu_properties_.find(pr_type);
+  if (pprop == this->gnu_properties_.end())
+    {
+      Gnu_property prop;
+      prop.pr_datasz = pr_datasz;
+      prop.pr_data = new unsigned char[pr_datasz];
+      memcpy(prop.pr_data, pr_data, pr_datasz);
+      this->gnu_properties_[pr_type] = prop;
+    }
+  else
+    {
+      if (pr_type >= elfcpp::GNU_PROPERTY_LOPROC
+	  && pr_type < elfcpp::GNU_PROPERTY_HIPROC)
+	{
+	  // Target-dependent property value; call the target to merge.
+	  parameters->target().merge_gnu_property(note_type,
+						  pr_type,
+						  pr_datasz,
+						  pr_data,
+						  pprop->second.pr_datasz,
+						  pprop->second.pr_data,
+						  object);
+	}
+      else
+	{
+	  const bool is_big_endian = parameters->target().is_big_endian();
+	  switch (pr_type)
+	    {
+	    case elfcpp::GNU_PROPERTY_STACK_SIZE:
+	      // Record the maximum value seen.
+	      {
+		uint64_t val1 = read_sized_value(pprop->second.pr_datasz,
+						 pprop->second.pr_data,
+						 is_big_endian, object);
+		uint64_t val2 = read_sized_value(pr_datasz, pr_data,
+						 is_big_endian, object);
+		if (val2 > val1)
+		  write_sized_value(val2, pprop->second.pr_datasz,
+				    pprop->second.pr_data, is_big_endian);
+	      }
+	      break;
+	    case elfcpp::GNU_PROPERTY_NO_COPY_ON_PROTECTED:
+	      // No data to merge.
+	      break;
+	    default:
+	      gold_warning(_("%s: unknown program property type %d "
+			     "in .note.gnu.properties section"),
+			   object->name().c_str(), pr_type);
+	    }
+	}
+    }
+}
+
 // Create automatic note sections.
 
 void
 Layout::create_notes()
 {
+  this->create_gnu_properties_note();
   this->create_gold_note();
   this->create_stack_segment();
   this->create_build_id();
@@ -3021,6 +3144,56 @@ Layout::create_note(const char* name, int note_type,
   return os;
 }
 
+// Create a .note.gnu.properties section to record program properties
+// accumulated from the input files.
+
+void
+Layout::create_gnu_properties_note()
+{
+  if (this->gnu_properties_.empty())
+    return;
+
+  const unsigned int size = parameters->target().get_size();
+  const bool is_big_endian = parameters->target().is_big_endian();
+
+  // Compute the total size of the properties array.
+  size_t descsz = 0;
+  for (Gnu_properties::const_iterator prop = this->gnu_properties_.begin();
+       prop != this->gnu_properties_.end();
+       ++prop)
+    {
+      descsz = align_address(descsz + 8 + prop->second.pr_datasz, size / 8);
+    }
+
+  // Create the note section.
+  size_t trailing_padding;
+  Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_PROPERTY_TYPE_0,
+					 ".note.gnu.properties", descsz,
+					 true, &trailing_padding);
+  if (os == NULL)
+    return;
+  gold_assert(trailing_padding == 0);
+
+  // Allocate and fill the properties array.
+  unsigned char* desc = new unsigned char[descsz];
+  unsigned char* p = desc;
+  for (Gnu_properties::const_iterator prop = this->gnu_properties_.begin();
+       prop != this->gnu_properties_.end();
+       ++prop)
+    {
+      size_t datasz = prop->second.pr_datasz;
+      size_t aligned_datasz = align_address(prop->second.pr_datasz, size / 8);
+      write_sized_value(prop->first, 4, p, is_big_endian);
+      write_sized_value(datasz, 4, p + 4, is_big_endian);
+      memcpy(p + 8, prop->second.pr_data, datasz);
+      if (aligned_datasz > datasz)
+        memset(p + 8 + datasz, 0, aligned_datasz - datasz);
+      p += 8 + aligned_datasz;
+    }
+  Output_section_data* posd = new Output_data_const(desc, descsz, 4);
+  os->add_output_section_data(posd);
+}
+
 // For an executable or shared library, create a note to record the
 // version of gold used to create the binary.
 
diff --git a/gold/layout.h b/gold/layout.h
index 806f6e53b01..d71d291b7c0 100644
--- a/gold/layout.h
+++ b/gold/layout.h
@@ -693,6 +693,14 @@ class Layout
   layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags,
 		   const Object*);
 
+  // Layout a .note.gnu.property section.
+  void
+  layout_gnu_property(unsigned int note_type,
+		      unsigned int pr_type,
+		      size_t pr_datasz,
+		      const unsigned char* pr_data,
+		      const Object* object);
+
   // Add an Output_section_data to the layout.  This is used for
   // special sections like the GOT section.  ORDER is where the
   // section should wind up in the output segment.  IS_RELRO is true
@@ -1061,6 +1069,10 @@ class Layout
   create_note(const char* name, int note_type, const char* section_name,
 	      size_t descsz, bool allocate, size_t* trailing_padding);
 
+  // Create a note section for gnu program properties.
+  void
+  create_gnu_properties_note();
+
   // Create a note section for gold version.
   void
   create_gold_note();
@@ -1347,6 +1359,14 @@ class Layout
     std::vector<Section_info> section_infos_;
   };
 
+  // Program properties from .note.gnu.properties sections.
+  struct Gnu_property
+  {
+    size_t pr_datasz;
+    unsigned char* pr_data;
+  };
+  typedef std::map<unsigned int, Gnu_property> Gnu_properties;
+
   // The number of input files, for sizing tables.
   int number_of_input_files_;
   // Information set by scripts or by command line options.
@@ -1473,6 +1493,8 @@ class Layout
   Incremental_binary* incremental_base_;
   // For incremental links, a list of free space within the file.
   Free_list free_list_;
+  // Program properties.
+  Gnu_properties gnu_properties_;
 };
 
 // This task handles writing out data in output sections which is not
diff --git a/gold/object.cc b/gold/object.cc
index 2b58f04ce66..8c874fedc8d 100644
--- a/gold/object.cc
+++ b/gold/object.cc
@@ -1282,6 +1282,102 @@ Sized_relobj_file<size, big_endian>::layout_eh_frame_section(
     this->set_relocs_must_follow_section_writes();
 }
 
+// Layout an input .note.gnu.property section.
+
+// This note section has an *extremely* non-standard layout.
+// The gABI spec says that ELF-64 files should have 8-byte fields and
+// 8-byte alignment in the note section, but the Gnu tools generally
+// use 4-byte fields and 4-byte alignment (see the comment for
+// Layout::create_note).  This section uses 4-byte fields (i.e.,
+// namesz, descsz, and type are always 4 bytes), the name field is
+// padded to a multiple of 4 bytes, but the desc field is padded
+// to a multiple of 4 or 8 bytes, depending on the ELF class.
+// The individual properties within the desc field always use
+// 4-byte pr_type and pr_datasz fields, but pr_data is padded to
+// a multiple of 4 or 8 bytes, depending on the ELF class.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::layout_gnu_property_section(
+    Layout* layout,
+    unsigned int shndx)
+{
+  section_size_type contents_len;
+  const unsigned char* pcontents = this->section_contents(shndx,
+							  &contents_len,
+							  false);
+  const unsigned char* pcontents_end = pcontents + contents_len;
+
+  // Loop over all the notes in this section.
+  while (pcontents < pcontents_end)
+    {
+      if (pcontents + 16 > pcontents_end)
+	{
+	  gold_warning(_("%s: corrupt .note.gnu.property section "
+			 "(note too short)"),
+		       this->name().c_str());
+	  return;
+	}
+
+      size_t namesz = elfcpp::Swap<32, big_endian>::readval(pcontents);
+      size_t descsz = elfcpp::Swap<32, big_endian>::readval(pcontents + 4);
+      unsigned int ntype = elfcpp::Swap<32, big_endian>::readval(pcontents + 8);
+      const unsigned char* pname = pcontents + 12;
+
+      if (namesz != 4 || strcmp(reinterpret_cast<const char*>(pname), "GNU") != 0)
+	{
+	  gold_warning(_("%s: corrupt .note.gnu.property section "
+			 "(name is not 'GNU')"),
+		       this->name().c_str());
+	  return;
+	}
+
+      if (ntype != elfcpp::NT_GNU_PROPERTY_TYPE_0)
+	{
+	  gold_warning(_("%s: unsupported note type %d "
+			 "in .note.gnu.property section"),
+		       this->name().c_str(), ntype);
+	  return;
+	}
+
+      size_t aligned_namesz = align_address(namesz, 4);
+      const unsigned char* pdesc = pname + aligned_namesz;
+
+      if (pdesc + descsz > pcontents + contents_len)
+	{
+	  gold_warning(_("%s: corrupt .note.gnu.property section"),
+		       this->name().c_str());
+	  return;
+	}
+
+      const unsigned char* pprop = pdesc;
+
+      // Loop over the program properties in this note.
+      while (pprop < pdesc + descsz)
+	{
+	  if (pprop + 8 > pdesc + descsz)
+	    {
+	      gold_warning(_("%s: corrupt .note.gnu.property section"),
+			   this->name().c_str());
+	      return;
+	    }
+	  unsigned int pr_type = elfcpp::Swap<32, big_endian>::readval(pprop);
+	  size_t pr_datasz = elfcpp::Swap<32, big_endian>::readval(pprop + 4);
+	  pprop += 8;
+	  if (pprop + pr_datasz > pdesc + descsz)
+	    {
+	      gold_warning(_("%s: corrupt .note.gnu.property section"),
+			   this->name().c_str());
+	      return;
+	    }
+	  layout->layout_gnu_property(ntype, pr_type, pr_datasz, pprop, this);
+	  pprop += align_address(pr_datasz, size / 8);
+	}
+
+      pcontents = pdesc + align_address(descsz, size / 8);
+    }
+}
+
 // Lay out the input sections.  We walk through the sections and check
 // whether they should be included in the link.  If they should, we
 // pass them to the Layout object, which will return an output section
@@ -1538,6 +1634,14 @@ Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab,
 	      omit[i] = true;
 	    }
 
+	  // Handle .note.gnu.property sections.
+	  if (sh_type == elfcpp::SHT_NOTE
+	      && strcmp(name, ".note.gnu.property") == 0)
+	    {
+	      this->layout_gnu_property_section(layout, i);
+	      omit[i] = true;
+	    }
+
 	  bool discard = omit[i];
 	  if (!discard)
 	    {
diff --git a/gold/object.h b/gold/object.h
index 08e5888f870..0b786a5471e 100644
--- a/gold/object.h
+++ b/gold/object.h
@@ -2663,6 +2663,10 @@ class Sized_relobj_file : public Sized_relobj<size, big_endian>
 			  unsigned int shndx, const typename This::Shdr&,
 			  unsigned int reloc_shndx, unsigned int reloc_type);
 
+  // Layout an input .note.gnu.property section.
+  void
+  layout_gnu_property_section(Layout* layout, unsigned int shndx);
+
   // Write section data to the output file.  Record the views and
   // sizes in VIEWS for use when relocating.
   void
diff --git a/gold/target.h b/gold/target.h
index da2f6bbc78c..1f8f757dbfa 100644
--- a/gold/target.h
+++ b/gold/target.h
@@ -509,6 +509,23 @@ class Target
   should_include_section(elfcpp::Elf_Word sh_type) const
   { return this->do_should_include_section(sh_type); }
 
+  // Merge a target-specific program property in the .note.gnu.properties
+  // section.
+  void
+  merge_gnu_property(int note_type,
+		     int pr_type,
+		     size_t new_pr_datasz,
+		     const unsigned char* new_pr_data,
+		     size_t old_pr_datasz,
+		     unsigned char* old_pr_data,
+		     const Object* object) const
+  {
+    return this->do_merge_gnu_property(note_type, pr_type,
+				       new_pr_datasz, new_pr_data,
+				       old_pr_datasz, old_pr_data,
+				       object);
+  }
+
  protected:
   // This struct holds the constant information for a child class.  We
   // use a struct to avoid the overhead of virtual function calls for
@@ -815,6 +832,13 @@ class Target
   do_should_include_section(elfcpp::Elf_Word) const
   { return true; }
 
+  // Merge a target-specific program property in the .note.gnu.properties
+  // section.
+  virtual void
+  do_merge_gnu_property(int, int, size_t, const unsigned char*,
+			size_t, unsigned char*, const Object*) const
+  { }
+
  private:
   // The implementations of the four do_make_elf_object virtual functions are
   // almost identical except for their sizes and endianness.  We use a template.
diff --git a/gold/testsuite/Makefile.am b/gold/testsuite/Makefile.am
index ab3b25809a9..f439011d37d 100644
--- a/gold/testsuite/Makefile.am
+++ b/gold/testsuite/Makefile.am
@@ -3255,6 +3255,23 @@ exception_x86_64_bnd_2.o: exception_test_2.cc gcctestdir/as
 	$(CXXCOMPILE) -c -Bgcctestdir/ -Wa,-madd-bnd-prefix -o $@ $<
 endif DEFAULT_TARGET_X86_64
 
+if DEFAULT_TARGET_X86_64
+check_SCRIPTS += gnu_property_test.sh
+check_DATA += gnu_property_test.stdout
+gnu_property_test.stdout: gnu_property_test
+	$(TEST_READELF) -n $< >$@
+gnu_property_test: gcctestdir/ld gnu_property_main.o gnu_property_a.o gnu_property_b.o gnu_property_c.o
+	$(LINK) -Bgcctestdir/ -o $@ gnu_property_main.o gnu_property_a.o gnu_property_b.o gnu_property_c.o
+gnu_property_main.o: gnu_property_main.c
+	$(COMPILE) -c -o $@ $<
+gnu_property_a.o: gnu_property_a.S
+	$(COMPILE) -c -o $@ $<
+gnu_property_b.o: gnu_property_b.S
+	$(COMPILE) -c -o $@ $<
+gnu_property_c.o: gnu_property_c.S
+	$(COMPILE) -c -o $@ $<
+endif DEFAULT_TARGET_X86_64
+
 check_PROGRAMS += pr22266
 pr22266: pr22266_main.o pr22266_ar.o gcctestdir/ld
 	$(LINK) -Bgcctestdir/ pr22266_main.o pr22266_ar.o
diff --git a/gold/testsuite/Makefile.in b/gold/testsuite/Makefile.in
index 14e4ce5c2c7..ee44c95ebf9 100644
--- a/gold/testsuite/Makefile.in
+++ b/gold/testsuite/Makefile.in
@@ -891,28 +891,30 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_test_tmp_4.o \
 @DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_test_5.a \
 @DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_test_6.a
-@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_84 = pr22266
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_84 = gnu_property_test.sh
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_85 = gnu_property_test.stdout
+@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_86 = pr22266
 
 # These tests work with native and cross linkers.
 
 # Test script section order.
-@NATIVE_OR_CROSS_LINKER_TRUE@am__append_85 = script_test_10.sh
-@NATIVE_OR_CROSS_LINKER_TRUE@am__append_86 = script_test_10.stdout
-@NATIVE_OR_CROSS_LINKER_TRUE@am__append_87 = script_test_10
+@NATIVE_OR_CROSS_LINKER_TRUE@am__append_87 = script_test_10.sh
+@NATIVE_OR_CROSS_LINKER_TRUE@am__append_88 = script_test_10.stdout
+@NATIVE_OR_CROSS_LINKER_TRUE@am__append_89 = script_test_10
 
 # These tests work with cross linkers only.
-@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_88 = split_i386.sh
-@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_89 = split_i386_1.stdout split_i386_2.stdout \
+@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_90 = split_i386.sh
+@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_91 = split_i386_1.stdout split_i386_2.stdout \
 @DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_i386_3.stdout split_i386_4.stdout split_i386_r.stdout
 
-@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_90 = split_i386_1 split_i386_2 split_i386_3 \
+@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_92 = split_i386_1 split_i386_2 split_i386_3 \
 @DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_i386_4 split_i386_r
 
-@DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_91 = split_x86_64.sh \
+@DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_93 = split_x86_64.sh \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	bnd_plt_1.sh \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	bnd_ifunc_1.sh \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	bnd_ifunc_2.sh
-@DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_92 = split_x86_64_1.stdout \
+@DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_94 = split_x86_64_1.stdout \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_x86_64_2.stdout \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_x86_64_3.stdout \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_x86_64_4.stdout \
@@ -920,14 +922,14 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	bnd_plt_1.stdout \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	bnd_ifunc_1.stdout \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	bnd_ifunc_2.stdout
-@DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_93 = split_x86_64_1 split_x86_64_2 split_x86_64_3 \
+@DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_95 = split_x86_64_1 split_x86_64_2 split_x86_64_3 \
 @DEFAULT_TARGET_X86_64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_x86_64_4 split_x86_64_r
 
-@DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_94 = split_x32.sh
-@DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_95 = split_x32_1.stdout split_x32_2.stdout \
+@DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_96 = split_x32.sh
+@DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_97 = split_x32_1.stdout split_x32_2.stdout \
 @DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_x32_3.stdout split_x32_4.stdout split_x32_r.stdout
 
-@DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_96 = split_x32_1 split_x32_2 split_x32_3 \
+@DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_98 = split_x32_1 split_x32_2 split_x32_3 \
 @DEFAULT_TARGET_X32_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_x32_4 split_x32_r
 
 
@@ -948,7 +950,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 # Check Thumb to ARM farcall veneers
 
 # Check handling of --target1-abs, --target1-rel and --target2 options
-@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_97 = arm_abs_global.sh \
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_99 = arm_abs_global.sh \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_branch_in_range.sh \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_branch_out_of_range.sh \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_fix_v4bx.sh \
@@ -971,7 +973,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_target2_got_rel.sh
 
 # The test demonstrates why the constructor of a target object should not access options.
-@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_98 = arm_abs_global.stdout \
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_100 = arm_abs_global.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_bl_in_range.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_bl_out_of_range.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	thumb_bl_in_range.stdout \
@@ -1024,7 +1026,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_target2_abs.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_target2_got_rel.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_target_lazy_init
-@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_99 = arm_abs_global \
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_101 = arm_abs_global \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_bl_in_range \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_bl_out_of_range \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	thumb_bl_in_range \
@@ -1075,20 +1077,20 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_target2_abs \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_target2_got_rel \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_target_lazy_init
-@DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_100 = aarch64_reloc_none.sh \
+@DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_102 = aarch64_reloc_none.sh \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	aarch64_relocs.sh \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	pr21430.sh \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	aarch64_tlsdesc.sh
-@DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_101 = aarch64_reloc_none.stdout \
+@DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_103 = aarch64_reloc_none.stdout \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	aarch64_relocs.stdout \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	pr21430.stdout \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	aarch64_tlsdesc.stdout
-@DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_102 = aarch64_reloc_none \
+@DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_104 = aarch64_reloc_none \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	aarch64_relocs \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	pr21430 \
 @DEFAULT_TARGET_AARCH64_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	aarch64_tlsdesc
-@DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_103 = split_s390.sh
-@DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_104 = split_s390_z1.stdout split_s390_z2.stdout split_s390_z3.stdout \
+@DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_105 = split_s390.sh
+@DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_106 = split_s390_z1.stdout split_s390_z2.stdout split_s390_z3.stdout \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390_z4.stdout split_s390_n1.stdout split_s390_n2.stdout \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390_a1.stdout split_s390_a2.stdout split_s390_z1_ns.stdout \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390_z2_ns.stdout split_s390_z3_ns.stdout split_s390_z4_ns.stdout \
@@ -1100,7 +1102,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390x_z4_ns.stdout split_s390x_n1_ns.stdout \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390x_n2_ns.stdout split_s390x_r.stdout
 
-@DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_105 = split_s390_z1 split_s390_z2 split_s390_z3 \
+@DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@am__append_107 = split_s390_z1 split_s390_z2 split_s390_z3 \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390_z4 split_s390_n1 split_s390_n2 split_s390_a1 \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390_a2 split_s390_z1_ns split_s390_z2_ns split_s390_z3_ns \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390_z4_ns split_s390_n1_ns split_s390_n2_ns split_s390_r \
@@ -1109,10 +1111,10 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390x_z1_ns split_s390x_z2_ns split_s390x_z3_ns \
 @DEFAULT_TARGET_S390_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	split_s390x_z4_ns split_s390x_n1_ns split_s390x_n2_ns split_s390x_r
 
-@DEFAULT_TARGET_X86_64_TRUE@am__append_106 = *.dwo *.dwp
-@DEFAULT_TARGET_X86_64_TRUE@am__append_107 = dwp_test_1.sh \
+@DEFAULT_TARGET_X86_64_TRUE@am__append_108 = *.dwo *.dwp
+@DEFAULT_TARGET_X86_64_TRUE@am__append_109 = dwp_test_1.sh \
 @DEFAULT_TARGET_X86_64_TRUE@	dwp_test_2.sh
-@DEFAULT_TARGET_X86_64_TRUE@am__append_108 = dwp_test_1.stdout \
+@DEFAULT_TARGET_X86_64_TRUE@am__append_110 = dwp_test_1.stdout \
 @DEFAULT_TARGET_X86_64_TRUE@	dwp_test_2.stdout
 subdir = testsuite
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -2809,9 +2811,9 @@ MOSTLYCLEANFILES = *.so *.syms *.stdout *.stderr $(am__append_4) \
 	$(am__append_34) $(am__append_37) $(am__append_41) \
 	$(am__append_47) $(am__append_51) $(am__append_52) \
 	$(am__append_58) $(am__append_78) $(am__append_81) \
-	$(am__append_83) $(am__append_87) $(am__append_90) \
-	$(am__append_93) $(am__append_96) $(am__append_99) \
-	$(am__append_102) $(am__append_105) $(am__append_106)
+	$(am__append_83) $(am__append_89) $(am__append_92) \
+	$(am__append_95) $(am__append_98) $(am__append_101) \
+	$(am__append_104) $(am__append_107) $(am__append_108)
 
 # We will add to these later, for each individual test.  Note
 # that we add each test under check_SCRIPTS or check_PROGRAMS;
@@ -2820,18 +2822,18 @@ check_SCRIPTS = $(am__append_2) $(am__append_19) $(am__append_23) \
 	$(am__append_29) $(am__append_35) $(am__append_42) \
 	$(am__append_45) $(am__append_49) $(am__append_53) \
 	$(am__append_56) $(am__append_62) $(am__append_73) \
-	$(am__append_76) $(am__append_79) $(am__append_85) \
-	$(am__append_88) $(am__append_91) $(am__append_94) \
-	$(am__append_97) $(am__append_100) $(am__append_103) \
-	$(am__append_107)
+	$(am__append_76) $(am__append_79) $(am__append_84) \
+	$(am__append_87) $(am__append_90) $(am__append_93) \
+	$(am__append_96) $(am__append_99) $(am__append_102) \
+	$(am__append_105) $(am__append_109)
 check_DATA = $(am__append_3) $(am__append_20) $(am__append_24) \
 	$(am__append_30) $(am__append_36) $(am__append_43) \
 	$(am__append_46) $(am__append_50) $(am__append_54) \
 	$(am__append_57) $(am__append_63) $(am__append_74) \
-	$(am__append_77) $(am__append_80) $(am__append_86) \
-	$(am__append_89) $(am__append_92) $(am__append_95) \
-	$(am__append_98) $(am__append_101) $(am__append_104) \
-	$(am__append_108)
+	$(am__append_77) $(am__append_80) $(am__append_85) \
+	$(am__append_88) $(am__append_91) $(am__append_94) \
+	$(am__append_97) $(am__append_100) $(am__append_103) \
+	$(am__append_106) $(am__append_110)
 BUILT_SOURCES = $(am__append_40)
 TESTS = $(check_SCRIPTS) $(check_PROGRAMS)
 
@@ -6148,6 +6150,13 @@ defsym_test.sh.log: defsym_test.sh
 	--log-file $$b.log --trs-file $$b.trs \
 	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
 	"$$tst" $(AM_TESTS_FD_REDIRECT)
+gnu_property_test.sh.log: gnu_property_test.sh
+	@p='gnu_property_test.sh'; \
+	b='gnu_property_test.sh'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
 script_test_10.sh.log: script_test_10.sh
 	@p='script_test_10.sh'; \
 	b='script_test_10.sh'; \
@@ -9454,6 +9463,18 @@ uninstall-am:
 @DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXCOMPILE) -c -fpic -Bgcctestdir/ -Wa,-madd-bnd-prefix -o $@ $<
 @DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@exception_x86_64_bnd_2.o: exception_test_2.cc gcctestdir/as
 @DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXCOMPILE) -c -Bgcctestdir/ -Wa,-madd-bnd-prefix -o $@ $<
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@gnu_property_test.stdout: gnu_property_test
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(TEST_READELF) -n $< >$@
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@gnu_property_test: gcctestdir/ld gnu_property_main.o gnu_property_a.o gnu_property_b.o gnu_property_c.o
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(LINK) -Bgcctestdir/ -o $@ gnu_property_main.o gnu_property_a.o gnu_property_b.o gnu_property_c.o
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@gnu_property_main.o: gnu_property_main.c
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(COMPILE) -c -o $@ $<
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@gnu_property_a.o: gnu_property_a.S
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(COMPILE) -c -o $@ $<
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@gnu_property_b.o: gnu_property_b.S
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(COMPILE) -c -o $@ $<
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@gnu_property_c.o: gnu_property_c.S
+@DEFAULT_TARGET_X86_64_TRUE@@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(COMPILE) -c -o $@ $<
 @GCC_TRUE@@NATIVE_LINKER_TRUE@pr22266: pr22266_main.o pr22266_ar.o gcctestdir/ld
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	$(LINK) -Bgcctestdir/ pr22266_main.o pr22266_ar.o
 @GCC_TRUE@@NATIVE_LINKER_TRUE@pr22266_ar.o: pr22266_a.o gcctestdir/ld
diff --git a/gold/testsuite/gnu_property_a.S b/gold/testsuite/gnu_property_a.S
new file mode 100644
index 00000000000..2fa073dc2f9
--- /dev/null
+++ b/gold/testsuite/gnu_property_a.S
@@ -0,0 +1,41 @@
+#define NT_GNU_PROPERTY_TYPE_0 5
+
+#define GNU_PROPERTY_STACK_SIZE 1
+#define GNU_PROPERTY_X86_ISA_1_USED 0xc0000000
+#define GNU_PROPERTY_X86_ISA_1_NEEDED 0xc0000001
+#define GNU_PROPERTY_X86_FEATURE_1_AND 0xc0000002
+
+#if __SIZEOF_PTRDIFF_T__  == 8
+# define ALIGN 3
+#elif __SIZEOF_PTRDIFF_T__  == 4
+# define ALIGN 2
+#endif
+
+        .section ".note.gnu.property", "a"
+        .p2align ALIGN
+
+        .long 1f - 0f           /* name length */
+        .long 5f - 2f           /* data length */
+        .long NT_GNU_PROPERTY_TYPE_0    /* note type */
+0:      .asciz "GNU"            /* vendor name */
+1:
+        .p2align ALIGN
+2:      .long GNU_PROPERTY_STACK_SIZE   /* pr_type.  */
+        .long 4f - 3f   /* pr_datasz.  */
+3:
+        .dc.a 0x800     /* Stack size.  */
+4:
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_ISA_1_USED
+	.long 4
+	.byte 0x01,0x10,0x00,0x00
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_ISA_1_NEEDED
+	.long 4
+	.byte 0x01,0x10,0x00,0x00
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_FEATURE_1_AND
+	.long 4
+	.byte 0x01,0x00,0x00,0x00
+        .p2align ALIGN
+5:
diff --git a/gold/testsuite/gnu_property_b.S b/gold/testsuite/gnu_property_b.S
new file mode 100644
index 00000000000..0c0c038ead1
--- /dev/null
+++ b/gold/testsuite/gnu_property_b.S
@@ -0,0 +1,38 @@
+#define NT_GNU_PROPERTY_TYPE_0 5
+
+#define GNU_PROPERTY_STACK_SIZE 1
+#define GNU_PROPERTY_NO_COPY_ON_PROTECTED 2
+#define GNU_PROPERTY_X86_ISA_1_USED 0xc0000000
+#define GNU_PROPERTY_X86_ISA_1_NEEDED 0xc0000001
+#define GNU_PROPERTY_X86_FEATURE_1_AND 0xc0000002
+
+#if __SIZEOF_PTRDIFF_T__  == 8
+# define ALIGN 3
+#elif __SIZEOF_PTRDIFF_T__  == 4
+# define ALIGN 2
+#endif
+
+        .section ".note.gnu.property", "a"
+        .p2align ALIGN
+        .long 1f - 0f           /* name length */
+        .long 3f - 2f           /* data length */
+        .long NT_GNU_PROPERTY_TYPE_0    /* note type */
+0:      .asciz "GNU"            /* vendor name */
+1:
+        .p2align ALIGN
+2:      .long GNU_PROPERTY_NO_COPY_ON_PROTECTED /* pr_type.  */
+        .long 0 /* pr_datasz.  */
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_ISA_1_USED
+	.long 4
+	.byte 0x01,0x11,0x00,0x00
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_ISA_1_NEEDED
+	.long 4
+	.byte 0x01,0x11,0x00,0x00
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_FEATURE_1_AND
+	.long 4
+	.byte 0x03,0x00,0x00,0x00
+        .p2align ALIGN
+3:
diff --git a/gold/testsuite/gnu_property_c.S b/gold/testsuite/gnu_property_c.S
new file mode 100644
index 00000000000..ace159a9a9d
--- /dev/null
+++ b/gold/testsuite/gnu_property_c.S
@@ -0,0 +1,44 @@
+#define NT_GNU_PROPERTY_TYPE_0 5
+
+#define GNU_PROPERTY_STACK_SIZE 1
+#define GNU_PROPERTY_NO_COPY_ON_PROTECTED 2
+#define GNU_PROPERTY_X86_ISA_1_USED 0xc0000000
+#define GNU_PROPERTY_X86_ISA_1_NEEDED 0xc0000001
+#define GNU_PROPERTY_X86_FEATURE_1_AND 0xc0000002
+
+#if __SIZEOF_PTRDIFF_T__  == 8
+# define ALIGN 3
+#elif __SIZEOF_PTRDIFF_T__  == 4
+# define ALIGN 2
+#endif
+
+        .section ".note.gnu.property", "a"
+        .p2align ALIGN
+        .long 1f - 0f           /* name length */
+        .long 5f - 2f           /* data length */
+        .long NT_GNU_PROPERTY_TYPE_0    /* note type */
+0:      .asciz "GNU"            /* vendor name */
+1:
+        .p2align ALIGN
+2:      .long GNU_PROPERTY_STACK_SIZE   /* pr_type.  */
+        .long 4f - 3f   /* pr_datasz.  */
+3:
+        .dc.a 0x111100  /* Stack size.  */
+4:
+        .p2align ALIGN
+        .long GNU_PROPERTY_NO_COPY_ON_PROTECTED /* pr_type.  */
+        .long 0 /* pr_datasz.  */
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_ISA_1_USED
+	.long 4
+	.byte 0x11,0x10,0x00,0x00
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_ISA_1_NEEDED
+	.long 4
+	.byte 0x11,0x10,0x00,0x00
+        .p2align ALIGN
+	.long GNU_PROPERTY_X86_FEATURE_1_AND
+	.long 4
+	.byte 0x01,0x00,0x00,0x00
+        .p2align ALIGN
+5:
diff --git a/gold/testsuite/gnu_property_main.c b/gold/testsuite/gnu_property_main.c
new file mode 100644
index 00000000000..77bc677e8eb
--- /dev/null
+++ b/gold/testsuite/gnu_property_main.c
@@ -0,0 +1,5 @@
+int
+main(void)
+{
+  return 0;
+}
diff --git a/gold/testsuite/gnu_property_test.sh b/gold/testsuite/gnu_property_test.sh
new file mode 100755
index 00000000000..9a188edda4e
--- /dev/null
+++ b/gold/testsuite/gnu_property_test.sh
@@ -0,0 +1,64 @@
+#!/bin/sh
+
+# gnu_property_test.sh -- test .note.gnu.property section.
+
+# Copyright (C) 2018 Free Software Foundation, Inc.
+# Written by Cary Coutant <ccoutant@gmail.com>.
+
+# This file is part of gold.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+# This script checks that after linking the three object files
+# gnu_property_[abc].S, each of which contains a .note.gnu.property
+# section, the resulting output has only a single such note section,
+# and that the properties have been correctly combined.
+
+check()
+{
+    if ! grep -q "$2" "$1"
+    then
+	echo "Did not find expected output in $1:"
+	echo "   $2"
+	echo ""
+	echo "Actual output below:"
+	cat "$1"
+	exit 1
+    fi
+}
+
+check_count()
+{
+    if test "`grep -c "$2" "$1"`" != "$3"
+    then
+	echo "Did not find correct number of note sections in $1:"
+	echo "   $2"
+	echo ""
+	echo "Actual output below:"
+	cat "$1"
+	exit 1
+    fi
+}
+
+check_count gnu_property_test.stdout "GNU\s*0x[0-9a-f]*\s*NT_GNU_PROPERTY_TYPE_0" 1
+
+check gnu_property_test.stdout "stack size: 0x111100"
+check gnu_property_test.stdout "no copy on protected"
+check gnu_property_test.stdout "x86 ISA used: i486, SSE2, SSE4_2, AVX512CD"
+check gnu_property_test.stdout "x86 ISA needed: i486, SSE2, SSE4_2, AVX512CD"
+check gnu_property_test.stdout "x86 feature: IBT"
+
+exit 0
diff --git a/gold/x86_64.cc b/gold/x86_64.cc
index 603ac300f72..e6fa47ea8f9 100644
--- a/gold/x86_64.cc
+++ b/gold/x86_64.cc
@@ -1188,6 +1188,12 @@ class Target_x86_64 : public Sized_target<size, false>
 				  this->rela_dyn_section(layout));
   }
 
+  // Merge a target-specific program property in the .note.gnu.properties
+  // section.
+  void
+  do_merge_gnu_property(int, int, size_t, const unsigned char*,
+			size_t, unsigned char*, const Object*) const;
+
   // Information about this specific target which we pass to the
   // general Target structure.
   static const Target::Target_info x86_64_info;
@@ -1433,6 +1439,39 @@ Target_x86_64<size>::rela_irelative_section(Layout* layout)
   return this->rela_irelative_;
 }
 
+// Merge a target-specific program property in the .note.gnu.properties
+// section.
+template<int size>
+void
+Target_x86_64<size>::do_merge_gnu_property(
+    int, int pr_type,
+    size_t new_pr_datasz, const unsigned char* new_pr_data,
+    size_t old_pr_datasz, unsigned char* old_pr_data,
+    const Object*) const
+{
+  size_t min_datasz = (new_pr_datasz > old_pr_datasz
+		       ? old_pr_datasz
+		       : new_pr_datasz);
+  switch (pr_type)
+    {
+    case elfcpp::GNU_PROPERTY_X86_ISA_1_USED:
+    case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED:
+      {
+        for (size_t i = 0; i < min_datasz; ++i)
+          old_pr_data[i] |= new_pr_data[i];
+      }
+      break;
+    case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND:
+      {
+        for (size_t i = 0; i < min_datasz; ++i)
+          old_pr_data[i] &= new_pr_data[i];
+      }
+      break;
+    default:
+      break;
+    }
+}
+
 // Write the first three reserved words of the .got.plt section.
 // The remainder of the section is written while writing the PLT
 // in Output_data_plt_i386::do_write.