linux-kernel - [PATCH 10/13] scripts/gdb: Add internal helper and convenience function to retrieve thread

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Date:	Mon,  5 Nov 2012 17:09:03 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: [PATCH 10/13] 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 |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/task.py b/scripts/gdb/task.py
index 41d85cc..523e495 100644
--- a/scripts/gdb/task.py
+++ b/scripts/gdb/task.py
@@ -67,3 +67,42 @@ class LxTaskByPidFunc(gdb.Function):
 			raise gdb.GdbError("No task of PID " + str(pid))
 
 LxTaskByPidFunc()
+
+
+thread_info_ptr_type = None
+
+def get_thread_info_ptr_type():
+	global thread_info_ptr_type
+	if thread_info_ptr_type == None:
+		thread_info_ptr_type = get_type('struct thread_info').pointer()
+	return thread_info_ptr_type
+
+ia64_task_size = None
+
+def get_thread_info(task):
+	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(get_thread_info_ptr_type())
+	else:
+		thread_info = task['stack'].cast(get_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.\n"
+
+	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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