[AArch64] MTE corefile support

bfd	* elf.c (elfcore_make_memtag_note_section): New function.
	(elfcore_grok_note): Handle NT_MEMTAG note types.

binutils* readelf.c (get_note_type): Handle NT_MEMTAG note types.

include	* elf/common.h (NT_MEMTAG): New constant.
	(NT_MEMTAG_TYPE_AARCH_MTE): New constant.

bfd/ChangeLog

@@ -1,3 +1,8 @@
+2021-05-21  Luis Machado  <luis.machado@linaro.org>
+
+	* elf.c (elfcore_make_memtag_note_section): New function.
+	(elfcore_grok_note): Handle NT_MEMTAG note types.
+
 2021-05-20  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* section.c (bfd_get_section_by_name): Return NULL if name is

bfd/elf.c

@@ -9597,6 +9597,23 @@ elfcore_make_auxv_note_section (bfd *abfd, Elf_Internal_Note *note,
   return true;
 }
 
+static bool
+elfcore_make_memtag_note_section (bfd *abfd, Elf_Internal_Note *note,
+				  size_t offs)
+{
+  asection *sect = bfd_make_section_anyway_with_flags (abfd, ".memtag",
+						       SEC_HAS_CONTENTS);
+
+  if (sect == NULL)
+    return false;
+
+  sect->size = note->descsz - offs;
+  sect->filepos = note->descpos + offs;
+  sect->alignment_power = 1 + bfd_get_arch_size (abfd) / 32;
+
+  return true;
+}
+
 /* prstatus_t exists on:
      solaris 2.5+
      linux 2.[01] + glibc
@@ -10657,6 +10674,8 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
       return elfcore_make_note_pseudosection (abfd, ".note.linuxcore.siginfo",
 					      note);
 
+    case NT_MEMTAG:
+      return elfcore_make_memtag_note_section (abfd, note, 0);
     }
 }
 

binutils/ChangeLog

@@ -1,3 +1,7 @@
+2021-05-21  Luis Machado  <luis.machado@linaro.org>
+
+	* readelf.c (get_note_type): Handle NT_MEMTAG note types.
+
 2021-05-19  Eli Schwartz  <eschwartz@archlinux.org>
 
 	* dwarf.c (ENABLE_CHECKING): Define to 0 if not previously set.

binutils/readelf.c

@@ -18696,6 +18696,8 @@ get_note_type (Filedata * filedata, unsigned e_type)
 	return _("NT_SIGINFO (siginfo_t data)");
       case NT_FILE:
 	return _("NT_FILE (mapped files)");
+      case NT_MEMTAG:
+	return _("NT_MEMTAG (memory tags)");
       default:
 	break;
       }

include/ChangeLog

@@ -1,3 +1,8 @@
+2021-05-21  Luis Machado  <luis.machado@linaro.org>
+
+	* elf/common.h (NT_MEMTAG): New constant.
+	(NT_MEMTAG_TYPE_AARCH_MTE): New constant.
+
 2021-05-07  Clément Chigot  <clement.chigot@atos.net>
 
 	* coff/internal.h (C_DWARF): New define.

include/elf/common.h

@@ -685,6 +685,12 @@
 /* The range 0xff000000 to 0xffffffff is set aside for notes that don't
    originate from any particular operating system.  */
 #define NT_GDB_TDESC	0xff000000	/* Contains copy of GDB's target description XML.  */
+#define NT_MEMTAG	0xff000001	/* Contains a copy of the memory tags.  */
+
+/* NT_MEMTAG record types.  */
+
+/* ARM-specific NT_MEMTAG types.  */
+#define NT_MEMTAG_TYPE_AARCH_MTE  0x400	/* MTE memory tags for AArch64.  */
 
 /* Note segments for core files on dir-style procfs systems.  */