ld: Support ELF GNU program properties

From .note.gnu.property section in each ELF input, we build a list of
GNU properties if .note.gnu.property section isn't corrupt.  The unknown
properties are ignored.  All property lists in relocatable inputs are
merged into an output property list.  When -z stack-size=N is used and
N isn't 0, the GNU_PROPERTY_STACK_SIZE property will be merged with or
added to the output property list.  .note.gnu.property section is
generated in output from the output property list.

bfd/

	* Makefile.am (BFD32_BACKENDS): Add elf-properties.lo.
	(BFD32_BACKENDS_CFILES): Add elf-properties.c.
	* configure.ac (elf): Add elf-properties.lo.
	* Makefile.in: Regenerated.
	* configure: Likewise.
	* elf-bfd.h (elf_property_kind): New.
	(elf_property): Likewise.
	(elf_property_list): Likewise.
	(elf_properties): Likewise.
	(_bfd_elf_parse_gnu_properties): Likewise.
	(_bfd_elf_get_property): Likewise.
	(_bfd_elf_link_setup_gnu_properties): Likewise.
	(elf_backend_data): Add parse_gnu_properties, merge_gnu_properties
	and setup_gnu_properties.
	(elf_obj_tdata): Add properties.
	* elf-properties.c: New file.
	* elf32-i386.c (elf_i386_parse_gnu_properties): New.
	(elf_i386_merge_gnu_properties): Likewise.
	(elf_backend_parse_gnu_properties): Likewise.
	(elf_backend_merge_gnu_properties): Likewise.
	* elf64-x86-64.c (elf_x86_64_parse_gnu_properties): Likewise.
	(elf_x86_64_merge_gnu_properties): Likewise.
	(elf_backend_parse_gnu_properties): Likewise.
	(elf_backend_merge_gnu_properties): Likewise.
	* elfxx-target.h (elf_backend_merge_gnu_properties): Likewise.
	(elf_backend_parse_gnu_properties): Likewise.
	(elf_backend_setup_gnu_properties): Likewise.
	(elfNN_bed): Add elf_backend_parse_gnu_properties,
	elf_backend_merge_gnu_properties and
	elf_backend_setup_gnu_properties.

ld/

	* ld/NEWS: Mention support for ELF GNU program properties.
	* emultempl/elf32.em (gld${EMULATION_NAME}_after_open): Call
	ELF setup_gnu_properties.
	* testsuite/ld-i386/i386.exp: Run property tests for Linux/i386.
	* testsuite/ld-i386/pass.c: New file.
	* testsuite/ld-i386/property-1.r: Likewise.
	* testsuite/ld-i386/property-2.r: Likewise.
	* testsuite/ld-i386/property-3.r: Likewise.
	* testsuite/ld-i386/property-4.r: Likewise.
	* testsuite/ld-i386/property-5.r: Likewise.
	* testsuite/ld-i386/property-6.r: Likewise.
	* testsuite/ld-i386/property-6a.c: Likewise.
	* testsuite/ld-i386/property-6b.c: Likewise.
	* testsuite/ld-i386/property-6c.S: Likewise.
	* testsuite/ld-i386/property-7.r: Likewise.
	* testsuite/ld-i386/property-no-copy.S: Likewise.
	* testsuite/ld-i386/property-stack.S: Likewise.
	* testsuite/ld-i386/property-unsorted-1.S: Likewise.
	* testsuite/ld-i386/property-unsorted-2.S: Likewise.
	* testsuite/ld-i386/property-x86-1.S: Likewise.
	* testsuite/ld-i386/property-x86-2.S: Likewise.
	* testsuite/ld-x86-64/pass.c: Likewise.
	* testsuite/ld-x86-64/property-1.r: Likewise.
	* testsuite/ld-x86-64/property-2.r: Likewise.
	* testsuite/ld-x86-64/property-3.r: Likewise.
	* testsuite/ld-x86-64/property-4.r: Likewise.
	* testsuite/ld-x86-64/property-5.r: Likewise.
	* testsuite/ld-x86-64/property-6.r: Likewise.
	* testsuite/ld-x86-64/property-6a.c: Likewise.
	* testsuite/ld-x86-64/property-6b.c: Likewise.
	* testsuite/ld-x86-64/property-6c.S: Likewise.
	* testsuite/ld-x86-64/property-7.r: Likewise.
	* testsuite/ld-x86-64/property-no-copy.S: Likewise.
	* testsuite/ld-x86-64/property-stack.S: Likewise.
	* testsuite/ld-x86-64/property-unsorted-1.S: Likewise.
	* testsuite/ld-x86-64/property-unsorted-2.S: Likewise.
	* testsuite/ld-x86-64/property-x86-1.S: Likewise.
	* testsuite/ld-x86-64/property-x86-2.S: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Run property tests for
	Linux/x86-64.

1 files changed, 77 insertions, 1 deletions

diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c
index e0e6c16..6d92c79 100644
--- a/bfd/elf64-x86-64.c
+++ b/bfd/elf64-x86-64.c
@@ -6896,8 +6896,80 @@ elf_x86_64_relocs_compatible (const bfd_target *input,
 	  && _bfd_elf_relocs_compatible (input, output));
 }
 
+/* Parse x86-64 GNU properties.  */
+
+static enum elf_property_kind
+elf_x86_64_parse_gnu_properties (bfd *abfd, unsigned int type,
+				 bfd_byte *ptr, unsigned int datasz)
+{
+  elf_property *prop;
+
+  switch (type)
+    {
+    case GNU_PROPERTY_X86_ISA_1_USED:
+    case GNU_PROPERTY_X86_ISA_1_NEEDED:
+      if (datasz != 4)
+	{
+	  _bfd_error_handler
+	    ((type == GNU_PROPERTY_X86_ISA_1_USED
+	      ? _("error: %B: <corrupt x86 ISA used size: 0x%x>\n")
+	      : _("error: %B: <corrupt x86 ISA needed size: 0x%x>\n")),
+	     abfd, datasz);
+	  return property_corrupt;
+	}
+      prop = _bfd_elf_get_property (abfd, type, datasz);
+      prop->u.number = bfd_h_get_32 (abfd, ptr);
+      prop->pr_kind = property_number;
+      break;
+
+    default:
+      return property_ignored;
+    }
+
+  return property_number;
+}
+
+/* Merge x86-64 GNU property BPROP with APROP.  If APROP isn't NULL,
+   return TRUE if APROP is updated.  Otherwise, return TRUE if BPROP
+   should be merged with ABFD.  */
+
+static bfd_boolean
+elf_x86_64_merge_gnu_properties (bfd *abfd ATTRIBUTE_UNUSED,
+				 elf_property *aprop,
+				 elf_property *bprop)
+{
+  unsigned int number;
+  bfd_boolean updated = FALSE;
+  unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
+
+  switch (pr_type)
+    {
+    case GNU_PROPERTY_X86_ISA_1_USED:
+    case GNU_PROPERTY_X86_ISA_1_NEEDED:
+      if (aprop != NULL && bprop != NULL)
+	{
+	  number = aprop->u.number;
+	  aprop->u.number = number | bprop->u.number;
+	  updated = number != (unsigned int) aprop->u.number;
+	}
+      else
+	{
+	  /* Return TRUE if APROP is NULL to indicate that BPROP should
+	     be added to ABFD.  */
+	  updated = aprop == NULL;
+	}
+      break;
+
+    default:
+      /* Never should happen.  */
+      abort ();
+    }
+
+  return updated;
+}
+
 static const struct bfd_elf_special_section
-  elf_x86_64_special_sections[]=
+elf_x86_64_special_sections[]=
 {
   { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS,   SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
   { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
@@ -6988,6 +7060,10 @@ static const struct bfd_elf_special_section
   ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
 #define elf_backend_fixup_symbol \
   elf_x86_64_fixup_symbol
+#define elf_backend_parse_gnu_properties \
+  elf_x86_64_parse_gnu_properties
+#define elf_backend_merge_gnu_properties \
+ elf_x86_64_merge_gnu_properties
 
 #include "elf64-target.h"