Re: breakpoint for avr?

["Theodore A. Roth" <troth at openavr dot org>]

On Thu, 15 May 2003, Andrew Cagney wrote:

:)
:) > Ok, I added the BREAKPOINT_FROM_PC method for the avr and as I
:) > suspected it doesn't interfere with remote targets (unless I am over
:) > looking something):
:)
:) Right.  If the remote target doesn't support the Z packet, GDB will use
:) BREAKPOINT_FROM_PC and then insert breakpoints in memory.  Try
:) > (gdb) b main
:) > Breakpoint 1 at 0x104: file tst.c, line 34.
:)
:) Do a:
:)
:) (gdb) set remote Z-packet off
:)
:) here.  You'll then see GDB doing memory writes.

Ok. Thanks for the explanation. I assume that "remote Z-packet" is on
by default.

I tried setting it off and found that I had the bytes swapped on the
break insn. After fixing that, my simulator worked fine:

(gdb) set remote Z-packet off
(gdb) b main
Breakpoint 1 at 0x104: file tst.c, line 34.
(gdb) c
Continuing.
Sending packet: $m104,2#60...Ack
Packet received: 0e94
Sending packet: $M104,2:9895#59...Ack
Packet received: OK
Sending packet: $Hc0#db...Ack
Packet received:
Sending packet: $c#63...Ack
Packet received: T0520:02;21:ff10;22:04010000;
Sending packet: $g#67...Ack
Packet received: 00000000000000000000000000000000000100000000000000000001ff100a0102ff1004010000
Sending packet: $mfc,8#9a...Ack
Packet received: cfefd0e1debfcdbf
Sending packet: $M104,2:0e94#7c...Ack
Packet received: OK

Breakpoint 1, main () at tst.c:34
(gdb)

:) > Andrew, does the attached patch help things with your patch? If so,
:) > I'll go ahead and commit it.
:)
:) Yes, it will avoid the problem.  My patch is at:
:) http://sources.redhat.com/ml/gdb-patches/2003-05/msg00211.html

Ok. I'll verify that and then commit my patch.

Thanks.

Ted Roth