linux-kernel - [PATCH v4 11/13] scripts/gdb: Add get_gdbserver

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Date:	Mon, 21 Jan 2013 18:06:18 +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 11/13] scripts/gdb: Add get_gdbserver_type helper

This helper probes the type of the gdb server. Supported are QEMU and
KGDB so far. Knowledge about the gdb server is required e.g. to retrieve
the current CPU or current task.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/utils.py |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/utils.py b/scripts/gdb/utils.py
index 532d379..a20f096 100644
--- a/scripts/gdb/utils.py
+++ b/scripts/gdb/utils.py
@@ -100,3 +100,38 @@ def is_target_arch(arch):
 	if target_arch == None:
 		target_arch = gdb.execute("show architecture", False, True)
 	return target_arch.find(arch) >= 0
+
+
+GDBSERVER_QEMU = 0
+GDBSERVER_KGDB = 1
+gdbserver_type = None
+
+def get_gdbserver_type():
+	def exit_handler(event):
+		global gdbserver_type
+		gdbserver_type = None
+		gdb.events.exited.disconnect(exit_handler)
+
+	def probe_qemu():
+		try:
+			return gdb.execute("monitor info version", False,
+					   True) != ""
+		except:
+			return False
+
+	def probe_kgdb():
+		try:
+			thread_info = gdb.execute("info thread 2", False, True)
+			return thread_info.find("shadowCPU0") >= 0
+		except:
+			return False
+
+	global gdbserver_type
+	if gdbserver_type == None:
+		if probe_qemu():
+			gdbserver_type = GDBSERVER_QEMU
+		elif probe_kgdb():
+			gdbserver_type = GDBSERVER_KGDB
+		if gdbserver_type != None:
+			gdb.events.exited.connect(exit_handler)
+	return gdbserver_type
-- 
1.7.3.4

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