S390: Support guarded-storage core note sections

Newer Linux kernel versions offer two new register sets in support of the
z/Architecture's guarded storage facility: NT_S390_GS_CB, the
"guarded-storage registers", and NT_S390_GS_BC, the "guarded-storage
broadcast control block".  This patch adds support for the respective core
notes sections to binutils.

bfd/ChangeLog:
	* elf-bfd.h (elfcore_write_s390_gs_cb): Add prototype.
	(elfcore_write_s390_gs_bc): Likewise.
	* elf.c (elfcore_grok_s390_gs_cb): New function.
	(elfcore_grok_s390_gs_bc): New function.
	(elfcore_grok_note): Call them.
	(elfcore_write_s390_gs_cb): New function.
	(elfcore_write_s390_gs_bc): New function.
	(elfcore_write_register_note): Call them.

binutils/ChangeLog:
	* readelf.c (get_note_type): Add NT_S390_GS_CB and NT_S390_GS_BC.

include/ChangeLog:
	* elf/common.h (NT_S390_GS_CB): New macro.
	(NT_S390_GS_BC): Likewise.

3 files changed, 71 insertions, 0 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index ad9eecb..9c62235 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,14 @@
+2017-06-29  Andreas Arnez  <arnez@linux.vnet.ibm.com>
+
+	* elf-bfd.h (elfcore_write_s390_gs_cb): Add prototype.
+	(elfcore_write_s390_gs_bc): Likewise.
+	* elf.c (elfcore_grok_s390_gs_cb): New function.
+	(elfcore_grok_s390_gs_bc): New function.
+	(elfcore_grok_note): Call them.
+	(elfcore_write_s390_gs_cb): New function.
+	(elfcore_write_s390_gs_bc): New function.
+	(elfcore_write_register_note): Call them.
+
 2017-06-28  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* libbfd.c (_bfd_generic_get_section_contents): Don't call
diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index b889720..92a8e02 100644
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -2533,6 +2533,10 @@ extern char *elfcore_write_s390_vxrs_low
   (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_s390_vxrs_high
   (bfd *, char *, int *, const void *, int);
+extern char *elfcore_write_s390_gs_cb
+  (bfd *, char *, int *, const void *, int);
+extern char *elfcore_write_s390_gs_bc
+  (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_arm_vfp
   (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_aarch_tls
diff --git a/bfd/elf.c b/bfd/elf.c
index 76c6a5c..a238d39 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -9191,6 +9191,18 @@ elfcore_grok_s390_vxrs_high (bfd *abfd, Elf_Internal_Note *note)
 }
 
 static bfd_boolean
+elfcore_grok_s390_gs_cb (bfd *abfd, Elf_Internal_Note *note)
+{
+  return elfcore_make_note_pseudosection (abfd, ".reg-s390-gs-cb", note);
+}
+
+static bfd_boolean
+elfcore_grok_s390_gs_bc (bfd *abfd, Elf_Internal_Note *note)
+{
+  return elfcore_make_note_pseudosection (abfd, ".reg-s390-gs-bc", note);
+}
+
+static bfd_boolean
 elfcore_grok_arm_vfp (bfd *abfd, Elf_Internal_Note *note)
 {
   return elfcore_make_note_pseudosection (abfd, ".reg-arm-vfp", note);
@@ -9668,6 +9680,20 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
       else
 	return TRUE;
 
+    case NT_S390_GS_CB:
+      if (note->namesz == 6
+	  && strcmp (note->namedata, "LINUX") == 0)
+	return elfcore_grok_s390_gs_bc (abfd, note);
+      else
+	return TRUE;
+
+    case NT_S390_GS_BC:
+      if (note->namesz == 6
+	  && strcmp (note->namedata, "LINUX") == 0)
+	return elfcore_grok_s390_gs_cb (abfd, note);
+      else
+	return TRUE;
+
     case NT_ARM_VFP:
       if (note->namesz == 6
 	  && strcmp (note->namedata, "LINUX") == 0)
@@ -10728,6 +10754,32 @@ elfcore_write_s390_vxrs_high (bfd *abfd,
 }
 
 char *
+elfcore_write_s390_gs_cb (bfd *abfd,
+			  char *buf,
+			  int *bufsiz,
+			  const void *s390_gs_cb,
+			  int size)
+{
+  char *note_name = "LINUX";
+  return elfcore_write_note (abfd, buf, bufsiz,
+			     note_name, NT_S390_GS_CB,
+			     s390_gs_cb, size);
+}
+
+char *
+elfcore_write_s390_gs_bc (bfd *abfd,
+			  char *buf,
+			  int *bufsiz,
+			  const void *s390_gs_bc,
+			  int size)
+{
+  char *note_name = "LINUX";
+  return elfcore_write_note (abfd, buf, bufsiz,
+			     note_name, NT_S390_GS_BC,
+			     s390_gs_bc, size);
+}
+
+char *
 elfcore_write_arm_vfp (bfd *abfd,
 		       char *buf,
 		       int *bufsiz,
@@ -10815,6 +10867,10 @@ elfcore_write_register_note (bfd *abfd,
     return elfcore_write_s390_vxrs_low (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-s390-vxrs-high") == 0)
     return elfcore_write_s390_vxrs_high (abfd, buf, bufsiz, data, size);
+  if (strcmp (section, ".reg-s390-gs-cb") == 0)
+    return elfcore_write_s390_gs_cb (abfd, buf, bufsiz, data, size);
+  if (strcmp (section, ".reg-s390-gs-bc") == 0)
+    return elfcore_write_s390_gs_bc (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-arm-vfp") == 0)
     return elfcore_write_arm_vfp (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-aarch-tls") == 0)