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.

1 files changed, 22 insertions, 0 deletions

diff --git a/gold/layout.h b/gold/layout.h
index 806f6e5..d71d291 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