linux-kernel - [PATCH v5 14/20] scripts/gdb: Add internal helper and convenience function to retrieve thread

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Message-Id: <c4fb2b8d82932f2e86956bd0bd08caf15855b652.1359463075.git.jan.kiszka@siemens.com>
Date:	Tue, 29 Jan 2013 13:37:57 +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>,
	Borislav Petkov <bp@...en8.de>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: [PATCH v5 14/20] scripts/gdb: Add internal helper and convenience function to retrieve thread_info

Add the internal helper get_thread_info that calculated the thread_info
from a given task variable. Also export this service as a convenience
function.

Note: ia64 version is untested.

CC: Tony Luck <tony.luck@...el.com>
CC: Fenghua Yu <fenghua.yu@...el.com>
CC: linux-ia64@...r.kernel.org
Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/task.py |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/task.py b/scripts/gdb/task.py
index fe42eb0..8e96238 100644
--- a/scripts/gdb/task.py
+++ b/scripts/gdb/task.py
@@ -62,3 +62,38 @@ class LxTaskByPidFunc(gdb.Function):
 			raise gdb.GdbError("No task of PID " + str(pid))
 
 LxTaskByPidFunc()
+
+
+thread_info_type = CachedType("struct thread_info")
+
+ia64_task_size = None
+
+def get_thread_info(task):
+	global thread_info_type
+	thread_info_ptr_type = thread_info_type.get_type().pointer()
+	if is_target_arch("ia64"):
+		global ia64_task_size
+		if ia64_task_size == None:
+			ia64_task_size = gdb.parse_and_eval(
+						"sizeof(struct task_struct)")
+		thread_info_addr = task.address + ia64_task_size
+		thread_info = thread_info_addr.cast(thread_info_ptr_type)
+	else:
+		thread_info = task['stack'].cast(thread_info_ptr_type)
+	return thread_info.dereference()
+
+
+class LxThreadInfoFunc (gdb.Function):
+	# Calculate Linux thread_info from task variable.
+	__doc__ = "Calculate Linux thread_info from task variable.\n" \
+		  "\n" \
+		  "$lx_thread_info(TASK): Given TASK, return the corresponding thread_info\n" \
+		  "variable."
+
+	def __init__(self):
+		super(LxThreadInfoFunc, self).__init__("lx_thread_info")
+
+	def invoke(self, task):
+		return get_thread_info(task)
+
+LxThreadInfoFunc()
-- 
1.7.3.4

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