Re: kgdb on arm for 2.6

Lance Spaulding wrote:
> George Anzinger wrote:
>
> > Hm... Looks like a gdb bug then.  The trace you did not show is the 
> > 6.0 gdb on the 2.6 kgdb.  That would be most interesting.  What I am 
> > seeing below is the 2.4 kgdb is doing the full single step on its 
> > own.  What I would expect to see the 6.0 gdb on the 2.6 kgdb doing is 
> > fetching the instruction, doing what ever side effects the instruction 
> > generates such as changing the PC and registers and, possibly memory.
> >
> > George
Hm... Yes, it does not even try to do a hw "s" but just gets to doing the 
needed breakpoint and so on.  Looks like gdb got dumbed down for 6.2.
> Here's a single step with gdb 6.0 on 2.6:
>
> GNU DDD 3.3.11 (i686-pc-linux-gnu), by Dorothea Lütkehaus and Andreas 
> Zeller.
> Copyright © 1995-1999 Technische Universität Braunschweig, Germany.
> Copyright © 1999-2001 Universität Passau, Germany.
> Copyright © 2001 Universität des Saarlandes, Germany.
> Copyright © 2001-2004 Free Software Foundation, Inc.
> (gdb) target remote lcsdebug6:4013
> Sending packet: $Hc-1#09...Nak
> Sending packet: $Hc-1#09...Ack
> Packet received: OK
> Sending packet: $qC#b4...Ack
> Packet received: QC0000000000000001
> Sending packet: $qOffsets#4b...Ack
> Packet received:
> Sending packet: $?#3f...Ack
> Packet received: S05
> Sending packet: $Hg1#e0...Ack
> Packet received: OK
> Sending packet: $g#67...Ack
> Packet received: 
> 01000000680000000100000024631e00cc631e000301000001000000010000000000d01f040000003c100000503ea400543ea400403ea400103f0800d450040000000000000000000000000000000000000000000000000000000000000000000000000013000060 
>
> Sending packet: $m450d4,4#fe...Ack
> Packet received: ffdeffe7
> Sending packet: $m450d4,4#fe...Ack
> Packet received: ffdeffe7
> Sending packet: $m450d4,4#fe...Ack
> Packet received: ffdeffe7
> 0x000450d4 in $d () at err.h:18
> warning: shared library handler failed to enable breakpoint
> Sending packet: $qSymbol::#5b...Ack
> Packet received:
> Packet qSymbol (symbol-lookup) is NOT supported
> (gdb) show version
> GNU gdb 6.0
> Copyright 2003 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 "--host=i686-pc-linux-gnu --target=arm-linux".
> (gdb) si
> Sending packet: $m450d4,4#fe...Ack
> Packet received: ffdeffe7
> Sending packet: $Z0,450d8,4#4b...Ack
> Packet received: OK
> Packet Z0 (software-breakpoint) is supported
> Sending packet: $Hc0#db...Ack
> Packet received: OK
> Sending packet: $c#63...Ack
> Packet received: T05thread:0000000000000001;
> [New Thread 1]
> Sending packet: $g#67...Ack
> Packet received: 
> 01000000680000000100000024631e00cc631e000301000001000000010000000000d01f040000003c100000503ea400543ea400403ea400103f0800d850040000000000000000000000000000000000000000000000000000000000000000000000000013000060 
>
> Sending packet: $z0,450d8,4#6b...Ack
> Packet received: OK
> Sending packet: $m450d8,4#02...Ack
> Packet received: 012042e2
> Sending packet: $m450d8,4#02...Ack
> Packet received: 012042e2
> Sending packet: $m450d8,4#02...Ack
> Packet received: 012042e2
> Sending packet: $m450d8,4#02...Ack
> Packet received: 012042e2
> Sending packet: $m450dc,4#2d...Ack
> Packet received: 002083e5
> Sending packet: $m450e0,4#fb...Ack
> Packet received: 10a89de8
> 0x000450d8 in $a () at err.h:18
> (gdb) si
> Sending packet: $m450d8,4#02...Ack
> Packet received: 012042e2
> Sending packet: $Z0,450dc,4#76...Ack
> Packet received: OK
> Sending packet: $c#63...Ack
> Packet received: T05thread:0000000000000001;
> Sending packet: $g#67...Ack
> Packet received: 
> 01000000680000000000000024631e00cc631e000301000001000000010000000000d01f040000003c100000503ea400543ea400403ea400103f0800dc50040000000000000000000000000000000000000000000000000000000000000000000000000013000060 
>
> Sending packet: $z0,450dc,4#96...Ack
> Packet received: OK
> Sending packet: $m450dc,4#2d...Ack
> Packet received: 002083e5
> Sending packet: $m450d8,4#02...Ack
> Packet received: 012042e2
> Sending packet: $m450dc,4#2d...Ack
> Packet received: 002083e5
> Sending packet: $m450dc,4#2d...Ack
> Packet received: 002083e5
> Sending packet: $m450d8,4#02...Ack
> Packet received: 012042e2
> Sending packet: $m450dc,4#2d...Ack
> Packet received: 002083e5
> Sending packet: $m450e0,4#fb...Ack
> Packet received: 10a89de8
> (gdb)
>
> Single-stepping one instruction at a time seems to work OK but I found 
> that using "next" or "step" still isn't working right for me (I'm 
> getting an invalid value in the reply -- still trying to isolate this 
> one to make sure its not something I'm doing).

Again, the "set debug remote 1" thing will show what request it had trouble 
with while trying to do the next or step (these are really nothing but a 
series of "si"s).  I am assuming this is NOT an SMP box, right?


--
George Anzinger   george@xxxxxxxxxx
HRT (High-res-timers):  http://sourceforge.net/projects/high-res-timers/


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