linux-kernel - [PATCH v3 04/13] scripts/gdb: Add get_target

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Message-Id: <4b6143216411504c48beac38462bd0b9036c2649.1354011091.git.jan.kiszka@siemens.com>
Date:	Tue, 27 Nov 2012 11:11:35 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>
Subject: [PATCH v3 04/13] 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@...mens.com>
---
 scripts/gdb/utils.py |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/utils.py b/scripts/gdb/utils.py
index f97ef79..e3191c5 100644
--- a/scripts/gdb/utils.py
+++ b/scripts/gdb/utils.py
@@ -56,3 +56,20 @@ class ContainerOf(gdb.Function):
 				    elementname.string())
 
 ContainerOf()
+
+
+BIG_ENDIAN = 0
+LITTLE_ENDIAN = 1
+target_endianness = None
+
+def get_target_endianness():
+	global target_endianness
+	if target_endianness == None:
+		endian = gdb.execute("show endian", False, True)
+		if endian.find("little endian") >= 0:
+			target_endianness = LITTLE_ENDIAN
+		elif endian.find("big endian") >= 0:
+			target_endianness = BIG_ENDIAN
+		else:
+			raise gdb.GdgError("unknown endianness '%s'" % endian)
+	return target_endianness
-- 
1.7.3.4

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