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authorJan Kiszka <jan.kiszka@siemens.com>2015-02-17 13:47:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-17 14:34:54 -0800
commitcf7492e933c0df200f8fa46c3684e8bd20890ab2 (patch)
tree5cda24e7cb12be776f05adee52dae2a3debf4217
parentscripts/gdb: add is_target_arch helper (diff)
downloadlinux-dev-cf7492e933c0df200f8fa46c3684e8bd20890ab2.tar.xz
linux-dev-cf7492e933c0df200f8fa46c3684e8bd20890ab2.zip
scripts/gdb: add internal helper and convenience function to retrieve thread_info
Add the internal helper get_thread_info that calculates the thread_info from a given task variable. Also export this service as a convenience function. Note: ia64 version is untested. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.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>
-rw-r--r--scripts/gdb/linux/tasks.py35
1 files changed, 35 insertions, 0 deletions
diff --git a/scripts/gdb/linux/tasks.py b/scripts/gdb/linux/tasks.py
index 13bb97cd3312..63cd6c517e6d 100644
--- a/scripts/gdb/linux/tasks.py
+++ b/scripts/gdb/linux/tasks.py
@@ -71,3 +71,38 @@ return that task_struct variable which PID matches."""
LxTaskByPidFunc()
+
+
+thread_info_type = utils.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 utils.is_target_arch("ia64"):
+ global ia64_task_size
+ if ia64_task_size is 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.
+
+$lx_thread_info(TASK): Given TASK, return the corresponding thread_info
+variable."""
+
+ def __init__(self):
+ super(LxThreadInfoFunc, self).__init__("lx_thread_info")
+
+ def invoke(self, task):
+ return get_thread_info(task)
+
+
+LxThreadInfoFunc()