elf: Add PT_GNU_PROPERTY segment type

Linkers group input note sections with the same name into one output
note section with the same name.  One output note section is placed in
one PT_NOTE segment.  New linkers merge all input .note.gnu.property
sections into one output .note.gnu.property section with a single
NT_GNU_PROPERTY_TYPE_0 note in a single PT_NOTE segment.  Since older
linkers treat input .note.gnu.property section as a generic note section
and just concatenate all input .note.gnu.property sections into one
output .note.gnu.property section without merging them, we may
see one or more NT_GNU_PROPERTY_TYPE_0 notes in PT_NOTE segment, which
are invalid.

GNU_PROPERTY_X86_UINT32_VALID was defined to address this issue such
that linker sets the bit for non-relocatable outputs.  But it isn't
sufficient:

1. It doesn't cover generic properties.
2. When -mx86-used-note=yes is passed to x86 assembler, the
GNU_PROPERTY_X86_UINT32_VALID bit is set in GNU_PROPERTY_X86_ISA_1_USED
property in object file and older linkers generate invalid
NT_GNU_PROPERTY_TYPE_0 notes with the GNU_PROPERTY_X86_UINT32_VALID bit
set.

I am proposing the following changes:

1. Add PT_GNU_PROPERTY segment type:

 # define PT_GNU_PROPERTY (PT_LOOS + 0x474e553)

which covers .note.gnu.property section.
2. Remove GNU_PROPERTY_X86_UINT32_VALID.

bfd/

	PR ld/23900
	* elf.c (get_program_header_size): Add a PT_GNU_PROPERTY
	segment for NOTE_GNU_PROPERTY_SECTION_NAME.
	(_bfd_elf_map_sections_to_segments): Create a PT_GNU_PROPERTY
	segment for NOTE_GNU_PROPERTY_SECTION_NAME.
	* elfxx-x86.c (_bfd_elf_link_setup_gnu_properties): Don't set
	GNU_PROPERTY_X86_UINT32_VALID.

binutils/

	PR ld/23900
	* readelf.c (get_segment_type): Support PT_GNU_PROPERTY.
	(decode_x86_isa): Don't check GNU_PROPERTY_X86_UINT32_VALID.
	(decode_x86_feature_1): Likewise.
	(decode_x86_feature_2): Likewise.
	(print_gnu_property_note): Remove GNU_PROPERTY_X86_UINT32_VALID
	check.
	* testsuite/binutils-all/i386/empty.d: Updated.
	* testsuite/binutils-all/x86-64/empty-x32.d: Likewise.
	* testsuite/binutils-all/x86-64/empty.d: Likewise.
	* testsuite/binutils-all/i386/pr21231b.s: Change
	GNU_PROPERTY_X86_ISA_1_USED bits to 0x7fffffff.
	* testsuite/binutils-all/x86-64/pr21231b.s: Likewise.

gas/

	PR ld/23900
	* config/tc-i386.c (x86_cleanup): Don't set
	GNU_PROPERTY_X86_UINT32_VALID.
	* testsuite/gas/i386/property-1.s: Change
	GNU_PROPERTY_X86_ISA_1_USED bits to 0.

include/

	PR ld/23900
	* elf/common.h (PT_GNU_PROPERTY): New.
	(GNU_PROPERTY_X86_UINT32_VALID): Removed.

ld/

	PR ld/23900
	* testsuite/ld-elf/elf.exp: Run PR ld/23900 test.
	* testsuite/ld-elf/pr23900-1-32.rd: New file.
	* testsuite/ld-elf/pr23900-1-64.rd: Likewise.
	* testsuite/ld-elf/pr23900-1.d: Likewise.
	* testsuite/ld-elf/pr23900-1.s: Likewise.
	* testsuite/ld-elf/pr23900-2.s: Likewise.
	* testsuite/ld-elf/pr23900-2a.d: Likewise.
	* testsuite/ld-elf/pr23900-2b.d: Likewise.
	* testsuite/ld-i386/ibt-plt-1.d: Adjusted.
	* testsuite/ld-i386/ibt-plt-2c.d: Likewise.
	* testsuite/ld-i386/ibt-plt-2d.d: Likewise.
	* testsuite/ld-i386/ibt-plt-3d.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-1-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-1.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2c-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2c.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2d-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2c.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3c-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3c.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3d-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3d.d: Likewise.
	* testsuite/ld-i386/pr23372c.d: Expect <None>
	for GNU_PROPERTY_X86_ISA_1_USED.
	* testsuite/ld-x86-64/pr23372c-x32.d: Likewise.
	* testsuite/ld-x86-64/pr23372c.d: Likewise.
	* testsuite/ld-x86-64/pr23372d-x32.d: Likewise.
	* testsuite/ld-x86-64/pr23372d.d: Likewise.
	* testsuite/ld-x86-64/property-x86-5a.s: Change
	GNU_PROPERTY_X86_ISA_1_USED bits to 0.
	* testsuite/ld-x86-64/property-x86-5b.s: Likewise.

1 files changed, 5 insertions, 16 deletions

diff --git a/binutils/readelf.c b/binutils/readelf.c
index 9969e46..dd84a19 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -3930,6 +3930,7 @@ get_segment_type (Filedata * filedata, unsigned long p_type)
     case PT_GNU_EH_FRAME: return "GNU_EH_FRAME";
     case PT_GNU_STACK:	return "GNU_STACK";
     case PT_GNU_RELRO:  return "GNU_RELRO";
+    case PT_GNU_PROPERTY: return "GNU_PROPERTY";
 
     default:
       if (p_type >= PT_GNU_MBIND_LO && p_type <= PT_GNU_MBIND_HI)
@@ -17048,13 +17049,11 @@ decode_x86_compat_isa (unsigned int bitmask)
 static void
 decode_x86_isa (unsigned int bitmask)
 {
-  if (bitmask == GNU_PROPERTY_X86_UINT32_VALID)
+  if (!bitmask)
     {
       printf (_("<None>"));
       return;
     }
-  else
-    bitmask &= ~GNU_PROPERTY_X86_UINT32_VALID;
 
   while (bitmask)
     {
@@ -17147,13 +17146,11 @@ decode_x86_isa (unsigned int bitmask)
 static void
 decode_x86_feature_1 (unsigned int bitmask)
 {
-  if (bitmask == GNU_PROPERTY_X86_UINT32_VALID)
+  if (!bitmask)
     {
       printf (_("<None>"));
       return;
     }
-  else
-    bitmask &= ~GNU_PROPERTY_X86_UINT32_VALID;
 
   while (bitmask)
     {
@@ -17180,13 +17177,11 @@ decode_x86_feature_1 (unsigned int bitmask)
 static void
 decode_x86_feature_2 (unsigned int bitmask)
 {
-  if (bitmask == GNU_PROPERTY_X86_UINT32_VALID)
+  if (!bitmask)
     {
       printf (_("<None>"));
       return;
     }
-  else
-    bitmask &= ~GNU_PROPERTY_X86_UINT32_VALID;
 
   while (bitmask)
     {
@@ -17282,13 +17277,7 @@ print_gnu_property_note (Filedata * filedata, Elf_Internal_Note * pnote)
 	      unsigned int bitmask;
 
 	      if (datasz == 4)
-		{
-		  bitmask = byte_get (ptr, 4);
-		  if ((filedata->file_header.e_type == ET_EXEC
-		       || filedata->file_header.e_type == ET_DYN)
-		      && !(bitmask & GNU_PROPERTY_X86_UINT32_VALID))
-		    printf ("Invalid ");
-		}
+		bitmask = byte_get (ptr, 4);
 	      else
 		bitmask = 0;