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.

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

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.  */
+/* Missing IBT, SHSTK and LAM property report control.  */
-enum elf_x86_cet_report
+enum elf_x86_prop_report
 {
-  cet_report_none	= 0,	    /* Do nothing.  */
+  prop_report_none	= 0,	    /* Do nothing.  */
-  cet_report_warning	= 1 << 0,   /* Issue a warning.  */
+  prop_report_warning	= 1 << 0,   /* Issue a warning.  */
-  cet_report_error	= 1 << 1,   /* Issue an error.  */
+  prop_report_error	= 1 << 1,   /* Issue an error.  */
-  cet_report_ibt	= 1 << 2,   /* Report missing IBT property.  */
+  prop_report_ibt	= 1 << 2,   /* Report missing IBT property.  */
-  cet_report_shstk	= 1 << 3    /* Report missing SHSTK 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;

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
+	  /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT,
-	     GNU_PROPERTY_X86_FEATURE_1_SHSTK.  */
+	     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))
+      if (htab->params->cet_report)
-	msg = _("%P: %pB: warning: missing %s\n");
+	{
-      else
+	  if ((htab->params->cet_report & prop_report_warning))
-	msg = _("%X%P: %pB: error: missing %s\n");
+	    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,
+  (struct bfd_link_info *info, elf_property_list **listp)
-   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)

binutils/ChangeLog

@@ -1,3 +1,16 @@
+2020-12-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* 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.
+
 2020-12-15  Vivek Das Mohapatra  <vivek@collabora.com>
 
 	* readelf.c (get_dynamic_type): Handle DT_GNU_FLAGS_1.

binutils/NEWS

@@ -1,5 +1,7 @@
 -*- text -*-
 
+* Update elfedit and readelf with LAM_U48 and LAM_U57 support.
+
 * Nm has a new command line option: --ifunc-chars=CHARS.  This specifies a
   string of one or two characters.  The first character is used as the type
   character when displaying global ifunc symbols.  The second character, if

binutils/doc/binutils.texi

@@ -5117,7 +5117,8 @@ supported ELF OSABI are the same as @option{--input-osabi}.
 @item --enable-x86-feature=@var{feature}
 Set the @var{feature} bit in program property in @var{exec} or @var{dyn}
 ELF files with machine types of @var{i386} or @var{x86-64}.  The
-supported features are, @var{ibt} and @var{shstk}.
+supported features are, @var{ibt}, @var{shstk}, @var{lam_u48} and
+@var{lam_u57}.
 
 @item --disable-x86-feature=@var{feature}
 Clear the @var{feature} bit in program property in @var{exec} or

binutils/elfedit.c

@@ -260,6 +260,10 @@ elf_x86_feature (const char *feature, int enable)
     x86_feature = GNU_PROPERTY_X86_FEATURE_1_IBT;
   else if (strcasecmp (feature, "shstk") == 0)
     x86_feature = GNU_PROPERTY_X86_FEATURE_1_SHSTK;
+  else if (strcasecmp (feature, "lam_u48") == 0)
+    x86_feature = GNU_PROPERTY_X86_FEATURE_1_LAM_U48;
+  else if (strcasecmp (feature, "lam_u57") == 0)
+    x86_feature = GNU_PROPERTY_X86_FEATURE_1_LAM_U57;
   else
     {
       error (_("Unknown x86 feature: %s\n"), feature);
@@ -920,9 +924,9 @@ usage (FILE *stream, int exit_status)
 	   osabi, osabi);
 #ifdef HAVE_MMAP
   fprintf (stream, _("\
-  --enable-x86-feature [ibt|shstk]\n\
+  --enable-x86-feature [ibt|shstk|lam_u48|lam_u57]\n\
                               Enable x86 feature\n\
-  --disable-x86-feature [ibt|shstk]\n\
+  --disable-x86-feature [ibt|shstk|lam_u48|lam_u57]\n\
                               Disable x86 feature\n"));
 #endif
   fprintf (stream, _("\

binutils/readelf.c

@@ -18748,6 +18748,12 @@ decode_x86_feature_1 (unsigned int bitmask)
 	case GNU_PROPERTY_X86_FEATURE_1_SHSTK:
 	  printf ("SHSTK");
 	  break;
+	case GNU_PROPERTY_X86_FEATURE_1_LAM_U48:
+	  printf ("LAM_U48");
+	  break;
+	case GNU_PROPERTY_X86_FEATURE_1_LAM_U57:
+	  printf ("LAM_U57");
+	  break;
 	default:
 	  printf (_("<unknown: %x>"), bit);
 	  break;

binutils/testsuite/binutils-all/x86-64/lam-u48.d

@@ -0,0 +1,12 @@
+#PROG: objcopy
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#objcopy:
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000010	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U48
+  GNU                  0x00000020	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 ISA used: 
+	x86 feature used: x86

binutils/testsuite/binutils-all/x86-64/lam-u48.s

@@ -0,0 +1,27 @@
+	.section ".note.gnu.property", "a"
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+	.long 1f - 0f		/* name length */
+	.long 5f - 2f		/* data length */
+	.long 5			/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+2:	.long 0xc0000002	/* pr_type.  */
+	.long 4f - 3f		/* pr_datasz.  */
+3:
+	.long 0x4
+4:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+5:

binutils/testsuite/binutils-all/x86-64/lam-u57.d

@@ -0,0 +1,12 @@
+#PROG: objcopy
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#objcopy:
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000010	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U57
+  GNU                  0x00000020	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 ISA used: 
+	x86 feature used: x86

binutils/testsuite/binutils-all/x86-64/lam-u57.s

@@ -0,0 +1,27 @@
+	.section ".note.gnu.property", "a"
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+	.long 1f - 0f		/* name length */
+	.long 5f - 2f		/* data length */
+	.long 5			/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+2:	.long 0xc0000002	/* pr_type.  */
+	.long 4f - 3f		/* pr_datasz.  */
+3:
+	.long 0x8
+4:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+5:

include/ChangeLog

@@ -1,3 +1,8 @@
+2020-12-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* elf/common.h (GNU_PROPERTY_X86_FEATURE_1_LAM_U48): New.
+	(GNU_PROPERTY_X86_FEATURE_1_LAM_U57): Likewise.
+
 2020-12-18  Alan Modra  <amodra@gmail.com>
 
 	* xtensa-isa-internal.h (xtisa_errno, xtisa_error_msg): Delete.

include/elf/common.h

@@ -842,6 +842,8 @@
 
 #define GNU_PROPERTY_X86_FEATURE_1_IBT		(1U << 0)
 #define GNU_PROPERTY_X86_FEATURE_1_SHSTK	(1U << 1)
+#define GNU_PROPERTY_X86_FEATURE_1_LAM_U48	(1U << 2)
+#define GNU_PROPERTY_X86_FEATURE_1_LAM_U57	(1U << 3)
 
 #define GNU_PROPERTY_X86_FEATURE_2_X86		(1U << 0)
 #define GNU_PROPERTY_X86_FEATURE_2_X87		(1U << 1)

ld/ChangeLog

@@ -1,3 +1,28 @@
+2020-12-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* 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.
+
 2020-12-18  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/27082

ld/NEWS

@@ -8,6 +8,19 @@
   encountered.  This option can be suppressed via the configure time
   switch: --enable-error-handling-script=no.
 
+* Add -z lam-u48 to x86-64 ELF linker to generate LAM_U48 property.
+
+* Add -z lam-u57 to x86-64 ELF linker to enerate LAM_U57 property.
+
+* Add -z lam-u48-report=[none|warning|error] to report missing LAM_U48
+  property.
+
+* Add -z lam-u57-report=[none|warning|error] to report missing LAM_U57
+  property.
+
+* Add -z lam-report=[none|warning|error] to report missing LAM_U48 and
+  LAM_U57 properties.
+
 * Add -z x86-64-{baseline|v[234]} to the x86 ELF linker to mark
   x86-64-{baseline|v[234]} ISA level as needed.
 

ld/emulparams/cet.sh

@@ -19,15 +19,15 @@ PARSE_AND_LIST_ARGS_CASE_Z_CET='
       else if (strncmp (optarg, "cet-report=", 11) == 0)
 	{
 	  if (strcmp (optarg + 11, "none") == 0)
-	    params.cet_report = cet_report_none;
+	    params.cet_report = prop_report_none;
 	  else if (strcmp (optarg + 11, "warning") == 0)
-	    params.cet_report = (cet_report_warning
+	    params.cet_report = (prop_report_warning
-				 | cet_report_ibt
+				 | prop_report_ibt
-				 | cet_report_shstk);
+				 | prop_report_shstk);
 	  else if (strcmp (optarg + 11, "error") == 0)
-	    params.cet_report = (cet_report_error
+	    params.cet_report = (prop_report_error
-				 | cet_report_ibt
+				 | prop_report_ibt
-				 | cet_report_shstk);
+				 | prop_report_shstk);
 	  else
 	    einfo (_("%F%P: invalid option for -z cet-report=: %s\n"),
 		   optarg + 11);

ld/emulparams/elf_x86_64.sh

@@ -5,6 +5,7 @@ source_sh ${srcdir}/emulparams/reloc_overflow.sh
 source_sh ${srcdir}/emulparams/call_nop.sh
 source_sh ${srcdir}/emulparams/cet.sh
 source_sh ${srcdir}/emulparams/x86-64-level.sh
+source_sh ${srcdir}/emulparams/x86-64-lam.sh
 source_sh ${srcdir}/emulparams/static.sh
 SCRIPT_NAME=elf
 ELFSIZE=64

ld/emulparams/x86-64-lam.sh

@@ -0,0 +1,69 @@
+PARSE_AND_LIST_OPTIONS_LAM='
+  fprintf (file, _("\
+  -z lam-u48                  Generate GNU_PROPERTY_X86_FEATURE_1_LAM_U48\n"));
+  fprintf (file, _("\
+  -z lam-u48-report=[none|warning|error] (default: none)\n\
+                              Report missing LAM_U48 property\n"));
+  fprintf (file, _("\
+  -z lam-u57                  Generate GNU_PROPERTY_X86_FEATURE_1_LAM_U57\n"));
+  fprintf (file, _("\
+  -z lam-u57-report=[none|warning|error] (default: none)\n\
+                              Report missing LAM_U57 property\n"));
+  fprintf (file, _("\
+  -z lam-report=[none|warning|error] (default: none)\n\
+                              Report missing LAM_U48 and LAM_U57 properties\n"));
+'
+PARSE_AND_LIST_ARGS_CASE_Z_LAM='
+      else if (strcmp (optarg, "lam-u48") == 0)
+	params.lam_u48 = TRUE;
+      else if (strncmp (optarg, "lam-u48-report=", 15) == 0)
+	{
+	  if (strcmp (optarg + 15, "none") == 0)
+	    params.lam_u48_report = prop_report_none;
+	  else if (strcmp (optarg + 15, "warning") == 0)
+	    params.lam_u48_report = prop_report_warning;
+	  else if (strcmp (optarg + 15, "error") == 0)
+	    params.lam_u48_report = prop_report_error;
+	  else
+	    einfo (_("%F%P: invalid option for -z lam-u48-report=: %s\n"),
+		   optarg + 15);
+	}
+      else if (strcmp (optarg, "lam-u57") == 0)
+	params.lam_u57 = TRUE;
+      else if (strncmp (optarg, "lam-u57-report=", 15) == 0)
+	{
+	  if (strcmp (optarg + 15, "none") == 0)
+	    params.lam_u57_report = prop_report_none;
+	  else if (strcmp (optarg + 15, "warning") == 0)
+	    params.lam_u57_report = prop_report_warning;
+	  else if (strcmp (optarg + 15, "error") == 0)
+	    params.lam_u57_report = prop_report_error;
+	  else
+	    einfo (_("%F%P: invalid option for -z lam-u57-report=: %s\n"),
+		   optarg + 15);
+	}
+      else if (strncmp (optarg, "lam-report=", 11) == 0)
+	{
+	  if (strcmp (optarg + 11, "none") == 0)
+	    {
+	      params.lam_u48_report = prop_report_none;
+	      params.lam_u57_report = prop_report_none;
+	    }
+	  else if (strcmp (optarg + 11, "warning") == 0)
+	    {
+	      params.lam_u48_report = prop_report_warning;
+	      params.lam_u57_report = prop_report_warning;
+	    }
+	  else if (strcmp (optarg + 11, "error") == 0)
+	    {
+	      params.lam_u48_report = prop_report_error;
+	      params.lam_u57_report = prop_report_error;
+	    }
+	  else
+	    einfo (_("%F%P: invalid option for -z lam-report=: %s\n"),
+		   optarg + 11);
+	}
+'
+
+PARSE_AND_LIST_OPTIONS="$PARSE_AND_LIST_OPTIONS $PARSE_AND_LIST_OPTIONS_LAM"
+PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_LAM"

ld/ld.texi

@@ -1316,6 +1316,50 @@ al which do not usually function correctly unless they are the sole instances
 of themselves. This behaviour can be overridden by the @code{dlmopen} caller
 and does not apply to certain loading mechanisms (such as audit libraries).
 
+@item lam-u48
+Generate GNU_PROPERTY_X86_FEATURE_1_LAM_U48 in .note.gnu.property section
+to indicate compatibility with Intel LAM_U48.  Supported for Linux/x86_64.
+
+@item lam-u57
+Generate GNU_PROPERTY_X86_FEATURE_1_LAM_U57 in .note.gnu.property section
+to indicate compatibility with Intel LAM_U57.  Supported for Linux/x86_64.
+
+@item lam-u48-report=none
+@itemx lam-u48-report=warning
+@itemx lam-u48-report=error
+Specify how to report the missing GNU_PROPERTY_X86_FEATURE_1_LAM_U48
+property in input .note.gnu.property section.
+@option{lam-u48-report=none}, which is the default, will make the
+linker not report missing properties in input files.
+@option{lam-u48-report=warning} will make the linker issue a warning for
+missing properties in input files.  @option{lam-u48-report=error} will
+make the linker issue an error for missing properties in input files.
+Supported for Linux/x86_64.
+
+@item lam-u57-report=none
+@itemx lam-u57-report=warning
+@itemx lam-u57-report=error
+Specify how to report the missing GNU_PROPERTY_X86_FEATURE_1_LAM_U57
+property in input .note.gnu.property section.
+@option{lam-u57-report=none}, which is the default, will make the
+linker not report missing properties in input files.
+@option{lam-u57-report=warning} will make the linker issue a warning for
+missing properties in input files.  @option{lam-u57-report=error} will
+make the linker issue an error for missing properties in input files.
+Supported for Linux/x86_64.
+
+@item lam-report=none
+@itemx lam-report=warning
+@itemx lam-report=error
+Specify how to report the missing GNU_PROPERTY_X86_FEATURE_1_LAM_U48 and
+GNU_PROPERTY_X86_FEATURE_1_LAM_U57 properties in input .note.gnu.property
+section.  @option{lam-report=none}, which is the default, will make the
+linker not report missing properties in input files.
+@option{lam-report=warning} will make the linker issue a warning for
+missing properties in input files.  @option{lam-report=error} will make
+the linker issue an error for missing properties in input files.
+Supported for Linux/x86_64.
+
 @item lazy
 When generating an executable or shared library, mark it to tell the
 dynamic linker to defer function call resolution to the point when

ld/testsuite/ld-x86-64/property-x86-lam-u48-1a.d

@@ -0,0 +1,11 @@
+#source: property-x86-empty.s
+#source: property-x86-lam-u48.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000020	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u48-1b.d

@@ -0,0 +1,11 @@
+#source: property-x86-lam-u48.s
+#source: property-x86-empty.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000020	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u48-2.d

@@ -0,0 +1,11 @@
+#source: property-x86-lam-u48.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U48
+	x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u48-3a.d

@@ -0,0 +1,12 @@
+#source: property-x86-3.s
+#source: property-x86-lam-u48.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 ISA needed: x86-64-baseline, x86-64-v2, <unknown: 10>, <unknown: 20>
+	x86 feature used: x86
+	x86 ISA used: x86-64-v2, x86-64-v4, <unknown: 20>, <unknown: 80>

ld/testsuite/ld-x86-64/property-x86-lam-u48-3b.d

@@ -0,0 +1,12 @@
+#source: property-x86-lam-u48.s
+#source: property-x86-3.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 ISA needed: x86-64-baseline, x86-64-v2, <unknown: 10>, <unknown: 20>
+	x86 feature used: x86
+	x86 ISA used: x86-64-v2, x86-64-v4, <unknown: 20>, <unknown: 80>

ld/testsuite/ld-x86-64/property-x86-lam-u48-4.d

@@ -0,0 +1,11 @@
+#source: property-x86-empty.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64 -z lam-u48
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U48
+	x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u48-5.d

@@ -0,0 +1,11 @@
+#source: start.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64 -z lam-u48
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U48
+	x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u48.s

@@ -0,0 +1,27 @@
+	.section ".note.gnu.property", "a"
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+	.long 1f - 0f		/* name length */
+	.long 5f - 2f		/* data length */
+	.long 5			/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+2:	.long 0xc0000002	/* pr_type.  */
+	.long 4f - 3f		/* pr_datasz.  */
+3:
+	.long 0x4
+4:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+5:

ld/testsuite/ld-x86-64/property-x86-lam-u57-1a.d

@@ -0,0 +1,11 @@
+#source: property-x86-empty.s
+#source: property-x86-lam-u57.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000020	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u57-1b.d

@@ -0,0 +1,11 @@
+#source: property-x86-lam-u57.s
+#source: property-x86-empty.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000020	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u57-2.d

@@ -0,0 +1,11 @@
+#source: property-x86-lam-u57.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U57
+	x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u57-3a.d

@@ -0,0 +1,12 @@
+#source: property-x86-3.s
+#source: property-x86-lam-u57.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 ISA needed: x86-64-baseline, x86-64-v2, <unknown: 10>, <unknown: 20>
+	x86 feature used: x86
+	x86 ISA used: x86-64-v2, x86-64-v4, <unknown: 20>, <unknown: 80>

ld/testsuite/ld-x86-64/property-x86-lam-u57-3b.d

@@ -0,0 +1,12 @@
+#source: property-x86-lam-u57.s
+#source: property-x86-3.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 ISA needed: x86-64-baseline, x86-64-v2, <unknown: 10>, <unknown: 20>
+	x86 feature used: x86
+	x86 ISA used: x86-64-v2, x86-64-v4, <unknown: 20>, <unknown: 80>

ld/testsuite/ld-x86-64/property-x86-lam-u57-4.d

@@ -0,0 +1,11 @@
+#source: property-x86-empty.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64 -z lam-u57
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U57
+	x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u57-5.d

@@ -0,0 +1,11 @@
+#source: start.s
+#as: --64 -defsym __64_bit__=1 -mx86-used-note=yes
+#ld: -r -melf_x86_64 -z lam-u57
+#readelf: -n
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+  GNU                  0x00000030	NT_GNU_PROPERTY_TYPE_0
+      Properties: x86 feature: LAM_U57
+	x86 feature used: x86
+	x86 ISA used: 

ld/testsuite/ld-x86-64/property-x86-lam-u57.s

@@ -0,0 +1,27 @@
+	.section ".note.gnu.property", "a"
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+	.long 1f - 0f		/* name length */
+	.long 5f - 2f		/* data length */
+	.long 5			/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+2:	.long 0xc0000002	/* pr_type.  */
+	.long 4f - 3f		/* pr_datasz.  */
+3:
+	.long 0x8
+4:
+.ifdef __64_bit__
+	.p2align 3
+.else
+	.p2align 2
+.endif
+5:

ld/testsuite/ld-x86-64/x86-64.exp

@@ -373,6 +373,20 @@ run_dump_test "property-x86-cet5b"
 run_dump_test "property-x86-cet5b-x32"
 run_dump_test "property-x86-cet6"
 run_dump_test "property-x86-cet6-x32"
+run_dump_test "property-x86-lam-u48-1a"
+run_dump_test "property-x86-lam-u48-1b"
+run_dump_test "property-x86-lam-u48-2"
+run_dump_test "property-x86-lam-u48-3a"
+run_dump_test "property-x86-lam-u48-3b"
+run_dump_test "property-x86-lam-u48-4"
+run_dump_test "property-x86-lam-u48-5"
+run_dump_test "property-x86-lam-u57-1a"
+run_dump_test "property-x86-lam-u57-1b"
+run_dump_test "property-x86-lam-u57-2"
+run_dump_test "property-x86-lam-u57-3a"
+run_dump_test "property-x86-lam-u57-3b"
+run_dump_test "property-x86-lam-u57-4"
+run_dump_test "property-x86-lam-u57-5"
 run_dump_test "pr21884"
 run_dump_test "pr22071"
 run_dump_test "pr22115-1a"