[PATCH 3/5] backends: Add PPC64 machine_flag_check.

[Mark Wielaard <mjw at redhat dot com>]

To distinguish between the current PPC64 ELF ABI and the revised
ELFv2 ABI that will not use function descriptors binutils started
to emit the version (currently 1) in the ehdr e_flags. Recognize
all valid versions (0, 1 or 2) in elflint by adding the hook
ppc64_machine_flag_check.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
---
 backends/ChangeLog      |  5 +++++
 backends/ppc64_init.c   |  3 ++-
 backends/ppc64_symbol.c | 12 +++++++++++-
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/backends/ChangeLog b/backends/ChangeLog
index 2074cff..4ea1acd 100644
--- a/backends/ChangeLog
+++ b/backends/ChangeLog
@@ -1,3 +1,8 @@
+2014-01-04  Mark Wielaard  <mjw@redhat.com>
+
+	* ppc64_symbol.c (ppc64_machine_flag_check): New function.
+	* ppc64_init.c (ppc64_init): Hook machine_flag_check.
+
 2014-01-03  Mark Wielaard  <mjw@redhat.com>
 
 	* Makefile.am (aarch64_SRCS): Add aarch64_cfi.c.
diff --git a/backends/ppc64_init.c b/backends/ppc64_init.c
index d8f1417..e52231c 100644
--- a/backends/ppc64_init.c
+++ b/backends/ppc64_init.c
@@ -1,5 +1,5 @@
 /* Initialization of PPC64 specific backend library.
-   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013 Red Hat, Inc.
+   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013, 2014 Red Hat, Inc.
    This file is part of elfutils.
    Written by Ulrich Drepper <drepper@redhat.com>, 2004.
 
@@ -58,6 +58,7 @@ ppc64_init (elf, machine, eh, ehlen)
   HOOK (eh, reloc_simple_type);
   HOOK (eh, dynamic_tag_name);
   HOOK (eh, dynamic_tag_check);
+  HOOK (eh, machine_flag_check);
   HOOK (eh, copy_reloc_p);
   HOOK (eh, check_special_symbol);
   HOOK (eh, bss_plt_p);
diff --git a/backends/ppc64_symbol.c b/backends/ppc64_symbol.c
index 244e40f..212d414 100644
--- a/backends/ppc64_symbol.c
+++ b/backends/ppc64_symbol.c
@@ -1,5 +1,5 @@
 /* PPC64 specific symbolic name handling.
-   Copyright (C) 2004, 2005 Red Hat, Inc.
+   Copyright (C) 2004, 2005, 2014 Red Hat, Inc.
    This file is part of elfutils.
    Written by Ulrich Drepper <drepper@redhat.com>, 2004.
 
@@ -110,3 +110,13 @@ ppc64_bss_plt_p (Elf *elf __attribute__ ((unused)),
 {
   return true;
 }
+
+/* Check whether machine flags are valid.  PPC64 has three possible values:
+   0 - for unspecified ABI, or not using any specific ABI features.
+   1 - for the original ELF PPC64 ABI using function descriptors.
+   2 - for the revised ELFv2 PPC64 ABI without function descriptors.  */
+bool
+ppc64_machine_flag_check (GElf_Word flags)
+{
+  return flags == 0 || flags == 1 || flags == 2;
+}
-- 
1.8.4.2