bfd/aarch64-linux: Support reading and writing the GCS core file note

Reviewed-By: Luis Machado <luis.machado@arm.com>

diff --git a/bfd/elf.c b/bfd/elf.c
index 14ce15c72545222a7f01c079f197f5d3780e23a7..f943cc489ba3211df8e8be0379f7b31bb20fbfeb 100644 (file)
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -10661,6 +10661,15 @@ elfcore_grok_aarch_zt (bfd *abfd, Elf_Internal_Note *note)
   return elfcore_make_note_pseudosection (abfd, ".reg-aarch-zt", note);
 }
 
+/* Convert NOTE into a bfd_section called ".reg-aarch-gcs".  Return TRUE if
+   successful, otherwise return FALSE.  */
+
+static bool
+elfcore_grok_aarch_gcs (bfd *abfd, Elf_Internal_Note *note)
+{
+  return elfcore_make_note_pseudosection (abfd, ".reg-aarch-gcs", note);
+}
+
 static bool
 elfcore_grok_arc_v2 (bfd *abfd, Elf_Internal_Note *note)
 {
@@ -11404,6 +11413,12 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
       else
        return true;
 
+    case NT_ARM_GCS:
+      if (note->namesz == 6 && strcmp (note->namedata, "LINUX") == 0)
+       return elfcore_grok_aarch_gcs (abfd, note);
+      else
+       return true;
+
     case NT_GDB_TDESC:
       if (note->namesz == 4
          && strcmp (note->namedata, "GDB") == 0)
@@ -13074,6 +13089,20 @@ elfcore_write_aarch_zt (bfd *abfd,
                             size);
 }
 
+/* Write the buffer of GCS register values in AARCH_GCS (length SIZE) into
+   the note buffer BUF and update *BUFSIZ.  ABFD is the bfd the note is being
+   written into.  Return a pointer to the new start of the note buffer, to
+   replace BUF which may no longer be valid.  */
+
+static char *
+elfcore_write_aarch_gcs (bfd *abfd, char *buf, int *bufsiz,
+                        const void *aarch_gcs, int size)
+{
+  const char *note_name = "LINUX";
+  return elfcore_write_note (abfd, buf, bufsiz, note_name, NT_ARM_GCS,
+                            aarch_gcs, size);
+}
+
 char *
 elfcore_write_arc_v2 (bfd *abfd,
                      char *buf,
@@ -13263,6 +13292,8 @@ elfcore_write_register_note (bfd *abfd,
     return elfcore_write_aarch_za (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-aarch-zt") == 0)
     return elfcore_write_aarch_zt (abfd, buf, bufsiz, data, size);
+  if (strcmp (section, ".reg-aarch-gcs") == 0)
+    return elfcore_write_aarch_gcs (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)

diff --git a/include/elf/common.h b/include/elf/common.h
index fd032d1e03ed5b19f84fda4a8f1a9ecb14867de3..f4b543b353acb2e3ff7f98b640b1d6e1df5e2391 100644 (file)
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -740,6 +740,9 @@
                                        /*   Note: name must be "LINUX".  */
 #define NT_ARM_ZT       0x40d           /* AArch64 SME2 ZT registers.  */
                                        /*   Note: name must be "LINUX".  */
+#define NT_ARM_GCS     0x410           /* AArch64 Guarded Control Stack
+                                          registers.  */
+                                       /*   Note  name must be "LINUX".  */
 #define NT_ARC_V2      0x600           /* ARC HS accumulator/extra registers.  */
                                        /*   note name must be "LINUX".  */
 #define NT_LARCH_CPUCFG 0xa00          /* LoongArch CPU config registers */