From 7f994963745b9cea89a2816dae7cc3a1fc01adcc Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Tue, 17 Feb 2015 13:46:58 -0800
Subject: scripts/gdb: add get_target_endianness helper

Parse the target endianness from the output of "show endian" and cache the
result to return it via the new helper get_target_endiannes.  We will need
it for reading integers from buffers that contain target memory.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 scripts/gdb/linux/utils.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'scripts')

diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py
index c9d705b62bfe..10a227bdb621 100644
--- a/scripts/gdb/linux/utils.py
+++ b/scripts/gdb/linux/utils.py
@@ -67,3 +67,21 @@ Note that TYPE and ELEMENT have to be quoted as strings."""
                             elementname.string())
 
 ContainerOf()
+
+
+BIG_ENDIAN = 0
+LITTLE_ENDIAN = 1
+target_endianness = None
+
+
+def get_target_endianness():
+    global target_endianness
+    if target_endianness is None:
+        endian = gdb.execute("show endian", to_string=True)
+        if "little endian" in endian:
+            target_endianness = LITTLE_ENDIAN
+        elif "big endian" in endian:
+            target_endianness = BIG_ENDIAN
+        else:
+            raise gdb.GdgError("unknown endianness '{0}'".format(endian))
+    return target_endianness
-- 
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