[Lldb-commits] [lldb] r196610 - Fixed the GDBRemoteCommuncation to return a new GDBRemoteCommuncation::PacketResult enum for all packet sends/receives.

[Greg Clayton]

I am able to make debugserver return "$#00" to the QStartNoAckMode and get it to work:

% ll a.out
Current executable set to 'a.out' (x86_64).
(lldb) log enable gdb-remote packets
(lldb) b main
Breakpoint 1: where = a.out`main + 64 at main.c:11, address = 0x0000000100000aa0
(lldb) r
<lldb.driver.main-thread> <   1> send packet: +
<lldb.driver.main-thread> <  19> send packet: $QStartNoAckMode#b0
<lldb.driver.main-thread> <   1> read packet: +
<lldb.driver.main-thread> <   4> read packet: $#00
<lldb.driver.main-thread> <   1> send packet: +
<lldb.driver.main-thread> <  26> send packet: $QThreadSuffixSupported#e4
<lldb.driver.main-thread> <   1> read packet: +
<lldb.driver.main-thread> <   6> read packet: $OK#9a
<lldb.driver.main-thread> <   1> send packet: +
<lldb.driver.main-thread> <  27> send packet: $QListThreadsInStopReply#21
<lldb.driver.main-thread> <   1> read packet: +
<lldb.driver.main-thread> <   6> read packet: $OK#9a
<lldb.driver.main-thread> <   1> send packet: +
<lldb.driver.main-thread> <  13> send packet: $qHostInfo#9b
<lldb.driver.main-thread> <   1> read packet: +
<lldb.driver.main-thread> < 122> read packet: $cputype:16777223;cpusubtype:3;ostype:macosx;watchpoint_exceptions_received:after;vendor:apple;endian:little;ptrsize:8;#16
<lldb.driver.main-thread> <   1> send packet: +


Not sure what it going on, but the current GDBRemoteCommunicationClient works for me. You will need to trace through to see what is else is failing.

On Dec 10, 2013, at 11:21 AM, Ed Maste <emaste at freebsd.org> wrote:

>> This actually does fix attaching to GDB servers that don't support QStartNoAckMode and was the main reason for making this fix!
> 
> Ok.  I'm trying to use lldb against QEMU's GDB server, and fail while
> trying the initial handshake.
> 
> Debug log shows:
> 
> (lldb) log enable gdb-remote packets
> (lldb) gdb-remote localhost:1234
> <   1> send packet: +
> history[1] tid=0x18a33 <   1> send packet: +
> <  19> send packet: $QStartNoAckMode#b0
> <   1> read packet: +
> <   4> read packet: $#00
> <   1> send packet: +
> error: failed to get reply to handshake packet
> 
> As far as I can tell the packet exchange looks like what I'd expect.