From: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Date: Thu, 1 May 2025 19:48:15 +0000 (-0300)
Subject: bfd/aarch64-linux: Support reading and writing the GCS core file note
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f35d1f8bb4cd56f75e1b6ac37409fad8f494207;p=thirdparty%2Fbinutils-gdb.git

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

diff --git a/bfd/elf.c b/bfd/elf.c
index b6f50701928..3739c4e6e54 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -10623,6 +10623,15 @@ 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)
 {
@@ -11359,6 +11368,12 @@ 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)
@@ -13020,6 +13035,20 @@ 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,
@@ -13207,6 +13236,8 @@ 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 fd032d1e03e..f4b543b353a 100644
--- 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 */