Add the ability for GDB to printout the thread name along with other

thread specific informations.

In order to do that, and in order to avoid KBI breakage with existing
infrastructure the following semantic is implemented:
- For live programs, a new member to the PT_LWPINFO is added (pl_tdname)
- For cores, a new ELF note is added (NT_THRMISC) that can be used for
  storing thread specific, miscellaneous, informations. Right now it is
  just popluated with a thread name.

GDB, then, retrieves the correct informations from the corefile via the
BFD interface, as it groks the ELF notes and create appropriate
pseudo-sections.

Sponsored by:	Sandvine Incorporated
Tested by:	gianni
Discussed with:	dim, kan, kib
MFC after:	2 weeks

2 files changed, 40 insertions, 0 deletions

diff --git a/contrib/binutils/bfd/elf-bfd.h b/contrib/binutils/bfd/elf-bfd.h
index 110dd69..0a01867 100644
--- a/contrib/binutils/bfd/elf-bfd.h
+++ b/contrib/binutils/bfd/elf-bfd.h
@@ -1673,6 +1673,8 @@ extern char * elfcore_write_pstatus
   (bfd *, char *, int *, long, int, const void *);
 extern char *elfcore_write_prfpreg
   (bfd *, char *, int *, const void *, int);
+extern char *elfcore_write_thrmisc
+  (bfd *, char *, int *, const char *, int);
 extern char *elfcore_write_prxfpreg
   (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_lwpstatus
diff --git a/contrib/binutils/bfd/elf.c b/contrib/binutils/bfd/elf.c
index 2b16f86..2f4728f 100644
--- a/contrib/binutils/bfd/elf.c
+++ b/contrib/binutils/bfd/elf.c
@@ -6316,6 +6316,12 @@ _bfd_elf_rel_vtable_reloc_fn
 
 #ifdef HAVE_SYS_PROCFS_H
 # include <sys/procfs.h>
+
+/* Define HAVE_THRMISC_T for consistency with other similar GNU-type stubs. */
+#undef	HAVE_THRMISC_T
+#if defined (THRMISC_VERSION)
+#define	HAVE_THRMISC_T	1
+#endif
 #endif
 
 /* FIXME: this is kinda wrong, but it's what gdb wants.  */
@@ -6497,6 +6503,16 @@ elfcore_grok_prxfpreg (bfd *abfd, Elf_Internal_Note *note)
   return elfcore_make_note_pseudosection (abfd, ".reg-xfp", note);
 }
 
+#if defined (HAVE_THRMISC_T)
+
+static bfd_boolean
+elfcore_grok_thrmisc (bfd *abfd, Elf_Internal_Note *note)
+{
+  return elfcore_make_note_pseudosection (abfd, ".tname", note);
+}
+
+#endif /* defined (HAVE_THRMISC_T) */
+
 #if defined (HAVE_PRPSINFO_T)
 typedef prpsinfo_t   elfcore_psinfo_t;
 #if defined (HAVE_PRPSINFO32_T)		/* Sparc64 cross Sparc32 */
@@ -6863,6 +6879,12 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
 
 	return TRUE;
       }
+
+#if defined (HAVE_THRMISC_T)
+    case NT_THRMISC:
+      return elfcore_grok_thrmisc (abfd, note);
+#endif
+
     }
 }
 
@@ -7245,6 +7267,22 @@ elfcore_write_prfpreg (bfd *abfd,
 }
 
 char *
+elfcore_write_thrmisc (bfd *abfd,
+		       char *buf,
+		       int *bufsiz,
+		       const char *tname,
+		       int size)
+{
+#if defined (HAVE_THRMISC_T)
+  char *note_name = "CORE";
+  return elfcore_write_note (abfd, buf, bufsiz,
+			     note_name, NT_THRMISC, tname, size);
+#else
+  return buf;
+#endif
+}
+
+char *
 elfcore_write_prxfpreg (bfd *abfd,
 			char *buf,
 			int *bufsiz,