[PATCH] [Binutils] Add MTE register set support for core files

[Luis Machado]

Teach binutils/GDB how to read core files containing the MTE register set,
which contains a single register called tagged_addr_ctrl.

bfd/ChangeLog:

YYYY-MM-DD  Luis Machado  <luis.machado@linaro.org>

	* elf-bfd.h (elfcore_write_aarch_mte): New prototype.
	* elf.c (elfcore_grok_aarch_mte, elfcore_write_aarch_mte): New
	functions.
	(elfcore_grok_note): Handle notes of type NT_ARM_TAGGED_ADDR_CTRL.
	(elfcore_write_register_note): Handle MTE notes.
---
 bfd/elf-bfd.h |  2 ++
 bfd/elf.c     | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index fb2683724e1..92b1722eacb 100644
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -2828,6 +2828,8 @@ extern char *elfcore_write_aarch_sve
   (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_aarch_pauth
   (bfd *, char *, int *, const void *, int);
+extern char *elfcore_write_aarch_mte
+  (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_arc_v2
   (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_riscv_csr
diff --git a/bfd/elf.c b/bfd/elf.c
index 851440b7652..8ed1623dfc1 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -9925,6 +9925,13 @@ elfcore_grok_aarch_pauth (bfd *abfd, Elf_Internal_Note *note)
   return elfcore_make_note_pseudosection (abfd, ".reg-aarch-pauth", note);
 }
 
+static bool
+elfcore_grok_aarch_mte (bfd *abfd, Elf_Internal_Note *note)
+{
+  return elfcore_make_note_pseudosection (abfd, ".reg-aarch-mte",
+					  note);
+}
+
 static bool
 elfcore_grok_arc_v2 (bfd *abfd, Elf_Internal_Note *note)
 {
@@ -10607,6 +10614,13 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
       else
 	return true;
 
+    case NT_ARM_TAGGED_ADDR_CTRL:
+      if (note->namesz == 6
+	  && strcmp (note->namedata, "LINUX") == 0)
+	return elfcore_grok_aarch_mte (abfd, note);
+      else
+	return true;
+
     case NT_GDB_TDESC:
       if (note->namesz == 4
           && strcmp (note->namedata, "GDB") == 0)
@@ -11986,6 +12000,20 @@ elfcore_write_aarch_pauth (bfd *abfd,
 			     note_name, NT_ARM_PAC_MASK, aarch_pauth, size);
 }
 
+char *
+elfcore_write_aarch_mte (bfd *abfd,
+				      char *buf,
+				      int *bufsiz,
+				      const void *aarch_mte,
+				      int size)
+{
+  char *note_name = "LINUX";
+  return elfcore_write_note (abfd, buf, bufsiz,
+			     note_name, NT_ARM_TAGGED_ADDR_CTRL,
+			     aarch_mte,
+			     size);
+}
+
 char *
 elfcore_write_arc_v2 (bfd *abfd,
 		      char *buf,
@@ -12114,6 +12142,8 @@ elfcore_write_register_note (bfd *abfd,
     return elfcore_write_aarch_sve (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-aarch-pauth") == 0)
     return elfcore_write_aarch_pauth (abfd, buf, bufsiz, data, size);
+  if (strcmp (section, ".reg-aarch-mte") == 0)
+    return elfcore_write_aarch_mte (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-arc-v2") == 0)
     return elfcore_write_arc_v2 (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".gdb-tdesc") == 0)
-- 
2.25.1