From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-return-17964-listarch-gdb=sources.redhat.com@sources.redhat.com>
Received: (qmail 2406 invoked by alias); 29 Apr 2004 20:13:45 -0000
Mailing-List: contact gdb-help@sources.redhat.com; run by ezmlm
Precedence: bulk
List-Subscribe: <mailto:gdb-subscribe@sources.redhat.com>
List-Archive: <http://sources.redhat.com/ml/gdb/>
List-Post: <mailto:gdb@sources.redhat.com>
List-Help: <mailto:gdb-help@sources.redhat.com>, <http://sources.redhat.com/ml/#faqs>
Sender: gdb-owner@sources.redhat.com
Received: (qmail 2388 invoked from network); 29 Apr 2004 20:13:43 -0000
Received: from unknown (HELO nexserver.spectracomcorp.com) (64.65.245.202)
  by sources.redhat.com with SMTP; 29 Apr 2004 20:13:43 -0000
Received: (from root@localhost)
	by nexserver.spectracomcorp.com (8.11.6/8.11.6) id i3TKDdq19565
	for gdb@sources.redhat.com; Thu, 29 Apr 2004 16:13:39 -0400
Received: from CoOp4 ([10.10.200.196])
	by nexserver.spectracomcorp.com (8.11.6/8.11.6) with SMTP id i3TKDZn19489
	for <gdb@sources.redhat.com>; Thu, 29 Apr 2004 16:13:37 -0400
Message-ID: <00a201c42e26$76475dc0$c4c80a0a@CoOp4>
From: "Eric Hammerle" <ehammerle@spectracomcorp.com>
To: <gdb@sources.redhat.com>
Subject: Remote Multithreaded Debugging
Date: Thu, 29 Apr 2004 23:26:00 -0000
MIME-Version: 1.0
X-Scanner: Protected by NexServerPro and F-Secure Anti-Virus
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-SW-Source: 2004-04/txt/msg00182.txt.bz2

Hi,

I'm currently attempting to get gdbserver 5.3 to debug a multithreaded
program
on an ARM7TDMI.  I'm using uClibc 0.9.19 and uClinux kernel v 2.4.20.  So
far
I have been able to debug single threaded programs while testing, but have
had
no luck in getting gdbserver to see the other threads.  Two questions:

1.  Is the mmu-less arm able to debug multithreaded programs using
gdbserver?
2.  When loading a multithreaded program, after calling add-symbol-file
     I get the following debug output:

gdbserver with remote_debug and debug_threads set to 1:

getpkt ("qSymbol::");  [sending ack]
[sent ack]
putpkt ("$qSymbol:5f5f707468726561645f746872656164735f6576656e7473#0d");
[lookin
g for ack]
[received '+' (0x2b)]
getpkt ("qSymbol:318018:5f5f707468726561645f746872656164735f6576656e7473");
[se
nding ack]
[sent ack]
putpkt ("$qSymbol:5f5f6c696e7578746872656164735f76657273696f6e#a9");
[looking fo
r ack]
[received '+' (0x2b)]
getpkt ("qSymbol:b09824:5f5f6c696e7578746872656164735f76657273696f6e");
[sendin
g ack]
[sent ack]
putpkt ("$qSymbol:5f5f707468726561645f6c6173745f6576656e74#90"); [looking
for ac
k]
[received '+' (0x2b)]
getpkt ("qSymbol:318020:5f5f707468726561645f6c6173745f6576656e74");
[sending ac
k]
[sent ack]
putpkt ("$qSymbol:5f5f707468726561645f68616e646c65735f6e756d#5b"); [looking
for
ack]
[received '+' (0x2b)]
getpkt ("qSymbol:1406e4:5f5f707468726561645f68616e646c65735f6e756d");
[sending
ack]
[sent ack]
putpkt ("$qSymbol:5f5f707468726561645f68616e646c6573#1f"); [looking for ack]
[received '+' (0x2b)]
getpkt ("qSymbol:13c6e4:5f5f707468726561645f68616e646c6573");  [sending ack]
[sent ack]
putpkt ("$qSymbol:707468726561645f6b657973#7e"); [looking for ack]
[received '+' (0x2b)]
getpkt ("qSymbol:140b20:707468726561645f6b657973");  [sending ack]
[sent ack]
putpkt
("$qSymbol:5f5f6c696e7578746872656164735f707468726561645f746872656164735f
6d6178#cb"); [looking for ack]
[received '+' (0x2b)]
getpkt
("qSymbol:b097e0:5f5f6c696e7578746872656164735f707468726561645f7468726561
64735f6d6178");  [sending ack]
[sent ack]
putpkt
("$qSymbol:5f5f6c696e7578746872656164735f707468726561645f6b6579735f6d6178
#c0"); [looking for ack]
[received '+' (0x2b)]
getpkt
("qSymbol:b0982c:5f5f6c696e7578746872656164735f707468726561645f6b6579735f
6d6178");  [sending ack]
[sent ack]
putpkt
("$qSymbol:5f5f6c696e7578746872656164735f707468726561645f73697a656f665f64
65736372#68"); [looking for ack]
[received '+' (0x2b)]
getpkt
("qSymbol:b09820:5f5f6c696e7578746872656164735f707468726561645f73697a656f
665f6465736372");  [sending ack]
[sent ack]
Writing ff to 00318018
putpkt
("$qSymbol:5f5f6c696e7578746872656164735f6372656174655f6576656e74#b6"); [
looking for ack]
[received '+' (0x2b)]
getpkt
("qSymbol:a4dd34:5f5f6c696e7578746872656164735f6372656174655f6576656e74")
;  [sending ack]
[sent ack]
Writing 01 to 00a4dd34
putpkt
("$qSymbol:5f5f6c696e7578746872656164735f696e697469616c5f7265706f72745f65
76656e7473#3f"); [looking for ack]
[received '+' (0x2b)]
getpkt
("qSymbol:318028:5f5f6c696e7578746872656164735f696e697469616c5f7265706f72
745f6576656e7473");  [sending ack]
[sent ack]
Writing 01 to 00318028

[at this point the program is no longer responsive]
I don't get this problem when debugging single threaded programs.

Any help would be most appreciated.  Thanks in advance!

E. Hammerle