x86-64: Add Intel LAM property support

Add Intel Linear Address Masking (LAM) property support.  LAM modifies
the checking that is applied to 64-bit linear addresses, allowing
software to use of the untranslated address bits for metadata.

bfd/

	* elf-linker-x86.h (elf_x86_cet_report): Renamed to ...
	(elf_x86_prop_report): This.
	(elf_linker_x86_params): Add lam_u48, lam_u57, lam_u48_report
	and lam_u57_report.
	* elfxx-x86.c (_bfd_x86_elf_link_setup_gnu_properties): Support
	GNU_PROPERTY_X86_FEATURE_1_LAM_U48 and
	GNU_PROPERTY_X86_FEATURE_1_LAM_U57.
	(_bfd_x86_elf_link_fixup_gnu_properties): Keep LAM features only
	for 64-bit output.

binutils/

	* NEWS: Mention LAM_U48 and LAM_U57 support.
	* elfedit.c (elf_x86_feature): Support lam_u48 and lam_u57.
	(usage): Add lam_u48 and lam_u57.
	* readelf.c (decode_x86_feature_1): Support LAM_U48 and LAM_U57.
	* doc/binutils.texi: Update elfedit with lam_u48 and lam_u57
	support.
	* testsuite/binutils-all/x86-64/lam-u48.d: New file.
	* testsuite/binutils-all/x86-64/lam-u48.s: Likewise.
	* testsuite/binutils-all/x86-64/lam-u57.d: Likewise.
	* testsuite/binutils-all/x86-64/lam-u57.s: Likewise.

include/

	* elf/common.h (GNU_PROPERTY_X86_FEATURE_1_LAM_U48): New.
	(GNU_PROPERTY_X86_FEATURE_1_LAM_U57): Likewise.

ld/

	* NEWS: Mention LAM_U48 and LAM_U57 support.
	* ld.texi: Document LAM_U48 and LAM_U57 support.
	* emulparams/cet.sh: Updated.
	* emulparams/elf_x86_64.sh: Source x86-64-lam.sh.
	* emulparams/x86-64-lam.sh: New file.
	* testsuite/ld-x86-64/property-x86-lam-u48-1a.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u48-1b.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u48-2.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u48-3a.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u48-3b.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u48-4.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u48-5.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u48.s: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57-1a.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57-1b.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57-2.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57-3a.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57-3b.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57-4.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57-5.d: Likewise.
	* testsuite/ld-x86-64/property-x86-lam-u57.s: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Run LAM tests.

3 files changed, 110 insertions, 27 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 582add8..0cb006d 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,15 @@
+2020-12-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* elf-linker-x86.h (elf_x86_cet_report): Renamed to ...
+	(elf_x86_prop_report): This.
+	(elf_linker_x86_params): Add lam_u48, lam_u57, lam_u48_report
+	and lam_u57_report.
+	* elfxx-x86.c (_bfd_x86_elf_link_setup_gnu_properties): Support
+	GNU_PROPERTY_X86_FEATURE_1_LAM_U48 and
+	GNU_PROPERTY_X86_FEATURE_1_LAM_U57.
+	(_bfd_x86_elf_link_fixup_gnu_properties): Keep LAM features only
+	for 64-bit output.
+
 2020-12-18  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/27091
diff --git a/bfd/elf-linker-x86.h b/bfd/elf-linker-x86.h
index 77e8196..c0f8fab 100644
--- a/bfd/elf-linker-x86.h
+++ b/bfd/elf-linker-x86.h
@@ -18,14 +18,14 @@
    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
    MA 02110-1301, USA.  */
 
-/* Missing IBT and SHSTK property report control.  */
-enum elf_x86_cet_report
+/* Missing IBT, SHSTK and LAM property report control.  */
+enum elf_x86_prop_report
 {
-  cet_report_none	= 0,	    /* Do nothing.  */
-  cet_report_warning	= 1 << 0,   /* Issue a warning.  */
-  cet_report_error	= 1 << 1,   /* Issue an error.  */
-  cet_report_ibt	= 1 << 2,   /* Report missing IBT property.  */
-  cet_report_shstk	= 1 << 3    /* Report missing SHSTK property.  */
+  prop_report_none	= 0,	    /* Do nothing.  */
+  prop_report_warning	= 1 << 0,   /* Issue a warning.  */
+  prop_report_error	= 1 << 1,   /* Issue an error.  */
+  prop_report_ibt	= 1 << 2,   /* Report missing IBT property.  */
+  prop_report_shstk	= 1 << 3    /* Report missing SHSTK property.  */
 };
 
 /* Used to pass x86-specific linker options from ld to bfd.  */
@@ -43,6 +43,12 @@ struct elf_linker_x86_params
   /* TRUE if GNU_PROPERTY_X86_FEATURE_1_SHSTK should be generated.  */
   unsigned int shstk: 1;
 
+  /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U48 should be generated.  */
+  unsigned int lam_u48: 1;
+
+  /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U57 should be generated.  */
+  unsigned int lam_u57: 1;
+
   /* TRUE if we shouldn't check relocation overflow.  */
   unsigned int no_reloc_overflow_check: 1;
 
@@ -59,7 +65,13 @@ struct elf_linker_x86_params
   unsigned int isa_level;
 
   /* Report missing IBT and SHSTK properties.  */
-  enum elf_x86_cet_report cet_report;
+  enum elf_x86_prop_report cet_report;
+
+  /* Report missing LAM_U48 property.  */
+  enum elf_x86_prop_report lam_u48_report;
+
+  /* Report missing LAM_U57 property.  */
+  enum elf_x86_prop_report lam_u57_report;
 
   /* The 1-byte NOP for x86 call instruction.  */
   char call_nop_byte;
diff --git a/bfd/elfxx-x86.c b/bfd/elfxx-x86.c
index 8246fe5..6c652d5 100644
--- a/bfd/elfxx-x86.c
+++ b/bfd/elfxx-x86.c
@@ -2545,15 +2545,25 @@ _bfd_x86_elf_link_setup_gnu_properties
   if (htab->params->ibt)
     {
       features = GNU_PROPERTY_X86_FEATURE_1_IBT;
-      htab->params->cet_report &= ~cet_report_ibt;
+      htab->params->cet_report &= ~prop_report_ibt;
     }
   if (htab->params->shstk)
     {
       features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
-      htab->params->cet_report &= ~cet_report_shstk;
+      htab->params->cet_report &= ~prop_report_shstk;
+    }
+  if (!(htab->params->cet_report & (prop_report_ibt | prop_report_shstk)))
+    htab->params->cet_report = prop_report_none;
+  if (htab->params->lam_u48)
+    {
+      features |= GNU_PROPERTY_X86_FEATURE_1_LAM_U48;
+      htab->params->lam_u48_report = prop_report_none;
+    }
+  if (htab->params->lam_u57)
+    {
+      features |= GNU_PROPERTY_X86_FEATURE_1_LAM_U57;
+      htab->params->lam_u57_report = prop_report_none;
     }
-  if (!(htab->params->cet_report & (cet_report_ibt | cet_report_shstk)))
-    htab->params->cet_report = cet_report_none;
 
   switch (htab->params->isa_level)
     {
@@ -2581,8 +2591,10 @@ _bfd_x86_elf_link_setup_gnu_properties
       prop = NULL;
       if (features)
 	{
-	  /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
-	     GNU_PROPERTY_X86_FEATURE_1_SHSTK.  */
+	  /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT,
+	     GNU_PROPERTY_X86_FEATURE_1_SHSTK,
+	     GNU_PROPERTY_X86_FEATURE_1_LAM_U48 and
+	     GNU_PROPERTY_X86_FEATURE_1_LAM_U57.  */
 	  prop = _bfd_elf_get_property (ebfd,
 					GNU_PROPERTY_X86_FEATURE_1_AND,
 					4);
@@ -2625,22 +2637,49 @@ _bfd_x86_elf_link_setup_gnu_properties
 	}
     }
 
-  if (htab->params->cet_report)
+  if (htab->params->cet_report
+      || htab->params->lam_u48_report
+      || htab->params->lam_u57_report)
     {
-      /* Report missing IBT and SHSTK properties.  */
+      /* Report missing IBT, SHSTK and LAM properties.  */
       bfd *abfd;
-      const char *msg;
+      const char *warning_msg = _("%P: %pB: warning: missing %s\n");
+      const char *error_msg = _("%X%P: %pB: error: missing %s\n");
+      const char *cet_msg = NULL;
+      const char *lam_u48_msg = NULL;
+      const char *lam_u57_msg = NULL;
+      const char *missing;
       elf_property_list *p;
       bfd_boolean missing_ibt, missing_shstk;
+      bfd_boolean missing_lam_u48, missing_lam_u57;
       bfd_boolean check_ibt
-	= !!(htab->params->cet_report & cet_report_ibt);
+	= (htab->params->cet_report
+	   && (htab->params->cet_report & prop_report_ibt));
       bfd_boolean check_shstk
-	= !!(htab->params->cet_report & cet_report_shstk);
+	= (htab->params->cet_report
+	   && (htab->params->cet_report & prop_report_shstk));
 
-      if ((htab->params->cet_report & cet_report_warning))
-	msg = _("%P: %pB: warning: missing %s\n");
-      else
-	msg = _("%X%P: %pB: error: missing %s\n");
+      if (htab->params->cet_report)
+	{
+	  if ((htab->params->cet_report & prop_report_warning))
+	    cet_msg = warning_msg;
+	  else
+	    cet_msg = error_msg;
+	}
+      if (htab->params->lam_u48_report)
+	{
+	  if ((htab->params->lam_u48_report & prop_report_warning))
+	    lam_u48_msg = warning_msg;
+	  else
+	    lam_u48_msg = error_msg;
+	}
+      if (htab->params->lam_u57_report)
+	{
+	  if ((htab->params->lam_u57_report & prop_report_warning))
+	    lam_u57_msg = warning_msg;
+	  else
+	    lam_u57_msg = error_msg;
+	}
 
       for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
 	if (!(abfd->flags & (DYNAMIC | BFD_PLUGIN | BFD_LINKER_CREATED))
@@ -2652,23 +2691,38 @@ _bfd_x86_elf_link_setup_gnu_properties
 
 	    missing_ibt = check_ibt;
 	    missing_shstk = check_shstk;
+	    missing_lam_u48 = !!lam_u48_msg;
+	    missing_lam_u57 = !!lam_u57_msg;
 	    if (p)
 	      {
 		missing_ibt &= !(p->property.u.number
 				 & GNU_PROPERTY_X86_FEATURE_1_IBT);
 		missing_shstk &= !(p->property.u.number
 				   & GNU_PROPERTY_X86_FEATURE_1_SHSTK);
+		missing_lam_u48 &= !(p->property.u.number
+				     & GNU_PROPERTY_X86_FEATURE_1_LAM_U48);
+		missing_lam_u57 &= !(p->property.u.number
+				     & GNU_PROPERTY_X86_FEATURE_1_LAM_U57);
 	      }
 	    if (missing_ibt || missing_shstk)
 	      {
-		const char *missing;
 		if (missing_ibt && missing_shstk)
 		  missing = _("IBT and SHSTK properties");
 		else if (missing_ibt)
 		  missing = _("IBT property");
 		else
 		  missing = _("SHSTK property");
-		info->callbacks->einfo (msg, abfd, missing);
+		info->callbacks->einfo (cet_msg, abfd, missing);
+	      }
+	    if (missing_lam_u48)
+	      {
+		missing = _("LAM_U48 property");
+		info->callbacks->einfo (lam_u48_msg, abfd, missing);
+	      }
+	    if (missing_lam_u57)
+	      {
+		missing = _("LAM_U57 property");
+		info->callbacks->einfo (lam_u57_msg, abfd, missing);
 	      }
 	  }
     }
@@ -3008,8 +3062,7 @@ _bfd_x86_elf_link_setup_gnu_properties
 
 void
 _bfd_x86_elf_link_fixup_gnu_properties
-  (struct bfd_link_info *info ATTRIBUTE_UNUSED,
-   elf_property_list **listp)
+  (struct bfd_link_info *info, elf_property_list **listp)
 {
   elf_property_list *p;
 
@@ -3037,6 +3090,12 @@ _bfd_x86_elf_link_fixup_gnu_properties
 	      continue;
 	    }
 
+	  /* Keep LAM features only for 64-bit output.  */
+	  if (type == GNU_PROPERTY_X86_FEATURE_1_AND
+	      && !ABI_64_P (info->output_bfd))
+	    p->property.u.number &= ~(GNU_PROPERTY_X86_FEATURE_1_LAM_U48
+				      | GNU_PROPERTY_X86_FEATURE_1_LAM_U57);
+
 	  listp = &p->next;
 	}
       else if (type > GNU_PROPERTY_HIPROC)