Re: kgdb on arm for 2.6

George Anzinger wrote:

> For this you will need an ARM dude.  That is not me...
>
> George

Is there an ARM kgdb expert on this list?  I'm running into another 
problem with the new kgdb.  Since this platform doesn't have an MMU I 
can debug both the kernel and user applications in the same gdb/kgdb 
debug session.  This mostly works but breakpoints dont seem to work 
right.  After I load the symbols for the user program I can set a 
breakpoint and run to it but then if I try to continue to run to another 
one, I always just wake up at the same breakpoint.  Gdb reports an error 
about not being writable (see below).  However, if I manually clear the 
breakpoint then hit continue, it will run to the next breakpoint (at 
which time the process repeats).  Any idea why it can't automatically 
clear user-space breakpoints in the current kgdb?  This works OK with 
the old kgdb and 2.4.

Here's an example of the breakpoint not clearing right when I try to 
continue:

Breakpoint 3, main (argc=1, argv=0x1fe3ffc0) at simpleinit.c:407
(gdb) cont
Sending packet: $m1fe011bc,4#20...Ack
Packet received: fedeffe7
Sending packet: $Z0,1fe011c0,4#37...Ack
Packet received: OK
Sending packet: $Hc1#dc...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
00000000c8fde31f0000000000000000d0fee31f0000000000000000c0ffe31f0100000000000000c4f1e01f90ffe31f30fde31f74fee31f9886e01fbc11e01f00000000000000000000000000000000000000000000000000000000000000000000000010000020
Sending packet: $z0,1fe011c0,4#57...Ack
Packet received: OK
Sending packet: $m1fe011bc,4#20...Ack
Packet received: fedeffe7
Sending packet: $Hc0#db...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T05thread:0000000000000001;
Sending packet: $g#67...Ack
Packet received: 
00000000c8fde31f0000000000000000d0fee31f0000000000000000c0ffe31f0100000000000000c4f1e01f90ffe31f30fde31f74fee31f9886e01fbc11e01f00000000000000000000000000000000000000000000000000000000000000000000000010000020
Sending packet: $m1fe011bc,4#20...Ack
Packet received: fedeffe7
Sending packet: $m1fe011bc,4#20...Ack
Packet received: fedeffe7
Sending packet: $m1fe0103c,4#f0...Ack
Packet received: f0412de9
Sending packet: $m1fe01040,4#be...Ack
Packet received: fedeffe7
Sending packet: $m1fe01044,4#c2...Ack
Packet received: e8d04de2
Sending packet: $m1fe01048,4#c6...Ack
Packet received: 003096e5
Sending packet: $m1fe0104c,4#f1...Ack
Packet received: 0080a0e1
Sending packet: $m1fe01050,4#bf...Ack
Packet received: 000053e3
Sending packet: $m1fe01054,4#c3...Ack
Packet received: 0170a0e1
Sending packet: $m1fe01058,4#c7...Ack
Packet received: 0700000a
Sending packet: $z0,1fe01040,4#27...Ack
Packet received: E02
Cannot remove breakpoints because program is no longer writable.
It might be running in another process.
Further execution is probably impossible.

Breakpoint 3, main (argc=1, argv=0x1fe3ffc0) at simpleinit.c:407

Also, if I try to run "next" while in a user-space program it usually 
just hangs the gdb session.  This also worked correctly on the old kgdb 
and 2.4.  Are these problems unique to me or is this new arm kgdb code 
just not being used widely?

Thanks in advance,
Lance




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