Re: [Gdb-discuss] Query on tracepoint usage

[Ramana Radhakrishnan]

Hi,

tracepoints are not supported in GDB / GDBserver . AFAIK it was
supported for some other embedded stub. Also use address@hidden
or address@hidden for generic queries about gdb. 

cheers
Ramana




> 
> Hi, 
> I am trying to get the tracedump of all local variables in a function
> using the gdb tracepoint functionality. 
> Here are the steps I followed  
> 
> 
> Started gdbserver on port 1234 ("test" is an executable) 
> 
> address@hidden test]$ gdbserver :1234 ./test 
> Process ./test created; pid = 17004 
> Remote debugging from host 127.0.0.1 
> 
> 
> in another terminal started gdb 
> 
> 
> address@hidden test]$ gdb test 
> GNU gdb 5.3 
> Copyright 2002 Free Software Foundation, Inc. 
> GDB is free software, covered by the GNU General Public License, and
> you are 
> welcome to change it and/or distribute copies of it under certain
> conditions. 
> Type "show copying" to see the conditions. 
> There is absolutely no warranty for GDB.  Type "show warranty" for
> details. 
> This GDB was configured as "i686-pc-linux-gnu"... 
> (gdb) target remote :1234 
> Remote debugging using :1234 
> 0x40000be0 in ?? () 
> (gdb) trace *myfunc           (setting trace for myfunc function) 
> Tracepoint 1 at 0x8048328: file test.c, line 1. 
> (gdb) actions 
> Enter actions for tracepoint 1, one per line. 
> End with a line saying just "end". 
> > collect $locals             (collect the local variables) 
> > end 
> (gdb) tstart                  (trace start) 
> Target does not support this command. 
> (gdb) 
> 
> tstart giving this error message (Target does not support this
> command). I am trying this on Redhat 9 (i386), gdb 5.3 version. Here
> are my observations when I looked the source code of gdb 5.3. There
> exist a function trace_start_command which calls putpkt("QTinit") and
> in the gdbserver code this packet "QTinit" is getting parsed. In the
> server side the packet "Q" handling function does not exist... which
> inturn makes it to throw the above said message.  
> 
> Am I doing something wrong here or the tracing support is not there on
> that version of gdb. Please do advice me in fixing this issue. 
> 
> Thanks a lot,
> Rajan
> _______________________________________________
> Gdb-discuss mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/gdb-discuss