From ad1cc4e492e51ff334df81b5e8610f91b50e373a Mon Sep 17 00:00:00 2001
From: Alan Hayward <alan.hayward@arm.com>
Date: Fri, 6 Jul 2018 16:25:21 +0100
Subject: [PATCH] Add checks for the NT_ARM_SVE section in a core file.

The NT_ARM_SVE section is documented here:
  https://github.com/torvalds/linux/blob/master/Documentation/arm64/sve.txt
  * A NT_ARM_SVE note will be added to each coredump for each thread of the
   dumped process.  The contents will be equivalent to the data that would have
   been read if a PTRACE_GETREGSET of NT_ARM_SVE were executed for each thread
   when the coredump was generated.

	* elf.c (elfcore_grok_aarch_sve): New function.
	(elfcore_grok_note): Check for Aarch64 SVE.
	(elfcore_write_aarch_sve): New function.
	(elfcore_write_register_note): Check for Aarch64 SVE.
	* elf-bfd.h(elfcore_grok_aarch_sve): New declaration.
---
 bfd/ChangeLog |  8 ++++++++
 bfd/elf-bfd.h |  2 ++
 bfd/elf.c     | 27 +++++++++++++++++++++++++++
 3 files changed, 37 insertions(+)

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index b844965..16d6daf 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,11 @@
+2018-07-06  Alan Hayward  <alan.hayward@arm.com>
+
+	* elf.c (elfcore_grok_aarch_sve): New function.
+	(elfcore_grok_note): Check for Aarch64 SVE.
+	(elfcore_write_aarch_sve): New function.
+	(elfcore_write_register_note): Check for Aarch64 SVE.
+	* elf-bfd.h(elfcore_grok_aarch_sve): New declaration.
+
 2018-07-06  Alan Modra  <amodra@gmail.com>
 
 	* elf32-arm.c (elf32_arm_nabi_write_core_note): Don't use
diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index e8eac7b..903dd9a 100644
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -2602,6 +2602,8 @@ extern char *elfcore_write_aarch_hw_break
   (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_aarch_hw_watch
   (bfd *, char *, int *, const void *, int);
+extern char *elfcore_write_aarch_sve
+  (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_lwpstatus
   (bfd *, char *, int *, long, int, const void *);
 extern char *elfcore_write_register_note
diff --git a/bfd/elf.c b/bfd/elf.c
index 0f75375..feb2c65 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -9340,6 +9340,12 @@ elfcore_grok_aarch_hw_watch (bfd *abfd, Elf_Internal_Note *note)
   return elfcore_make_note_pseudosection (abfd, ".reg-aarch-hw-watch", note);
 }
 
+static bfd_boolean
+elfcore_grok_aarch_sve (bfd *abfd, Elf_Internal_Note *note)
+{
+  return elfcore_make_note_pseudosection (abfd, ".reg-aarch-sve", note);
+}
+
 #if defined (HAVE_PRPSINFO_T)
 typedef prpsinfo_t   elfcore_psinfo_t;
 #if defined (HAVE_PRPSINFO32_T)		/* Sparc64 cross Sparc32 */
@@ -9836,6 +9842,13 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
       else
 	return TRUE;
 
+    case NT_ARM_SVE:
+      if (note->namesz == 6
+	  && strcmp (note->namedata, "LINUX") == 0)
+	return elfcore_grok_aarch_sve (abfd, note);
+      else
+	return TRUE;
+
     case NT_PRPSINFO:
     case NT_PSINFO:
       if (bed->elf_backend_grok_psinfo)
@@ -11028,6 +11041,18 @@ elfcore_write_aarch_hw_watch (bfd *abfd,
 }
 
 char *
+elfcore_write_aarch_sve (bfd *abfd,
+			 char *buf,
+			 int *bufsiz,
+			 const void *aarch_sve,
+			 int size)
+{
+  char *note_name = "LINUX";
+  return elfcore_write_note (abfd, buf, bufsiz,
+			     note_name, NT_ARM_SVE, aarch_sve, size);
+}
+
+char *
 elfcore_write_register_note (bfd *abfd,
 			     char *buf,
 			     int *bufsiz,
@@ -11079,6 +11104,8 @@ elfcore_write_register_note (bfd *abfd,
     return elfcore_write_aarch_hw_break (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-aarch-hw-watch") == 0)
     return elfcore_write_aarch_hw_watch (abfd, buf, bufsiz, data, size);
+  if (strcmp (section, ".reg-aarch-sve") == 0)
+    return elfcore_write_aarch_sve (abfd, buf, bufsiz, data, size);
   return NULL;
 }
 
-- 
2.7.4