linux-kernel - [PATCH v4 05/13] scripts/gdb: Add read

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Message-Id: <2cff4333b45f0812a69bef7abfd403b842e23d87.1358787929.git.jan.kiszka@siemens.com>
Date:	Mon, 21 Jan 2013 18:06:12 +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>, Ben Widawsky <ben@...dawsk.net>
Subject: [PATCH v4 05/13] scripts/gdb: Add read_u16/32/64 helpers

Add helpers for reading integers from target memory buffers. Required
when caching the memory access is more efficient than reading individual
values via gdb.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/utils.py |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/utils.py b/scripts/gdb/utils.py
index 44daa29c..8d54241 100644
--- a/scripts/gdb/utils.py
+++ b/scripts/gdb/utils.py
@@ -73,3 +73,21 @@ def get_target_endianness():
 		else:
 			raise gdb.GdgError("unknown endianness '%s'" % endian)
 	return target_endianness
+
+def read_u16(buffer):
+	if get_target_endianness() == LITTLE_ENDIAN:
+		return ord(buffer[0]) + (ord(buffer[1]) << 8)
+	else:
+		return ord(buffer[1]) + (ord(buffer[0]) << 8)
+
+def read_u32(buffer):
+	if get_target_endianness() == LITTLE_ENDIAN:
+		return read_u16(buffer[0:2]) + (read_u16(buffer[2:4]) << 16)
+	else:
+		return read_u16(buffer[2:4]) + (read_u16(buffer[0:2]) << 16)
+
+def read_u64(buffer):
+	if get_target_endianness() == LITTLE_ENDIAN:
+		return read_u32(buffer[0:4]) + (read_u32(buffer[4:8]) << 32)
+	else:
+		return read_u32(buffer[4:8]) + (read_u32(buffer[0:4]) << 32)
-- 
1.7.3.4

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