gdbserver breakpoint problem with PowerPC

Daniel Jacobowitz
Thu Apr 1 20:52:00 GMT 2004

On Thu, Apr 01, 2004 at 02:51:07PM -0500, Andre Ancelin wrote:
> Hi everyone!
> I'm having a problem with gdbserver 6.0. Setup:
> HOST- x86 (P4), SuSE 8.0 distro, gdb 6.0
> TARGET- PowerPC405GP (custom board), 2.4.21 PPC kernel (custom), gdbserver
> 6.0 w/ dependency.
> TOOLCHAIN- binutil 2.11.2, gcc 2.95.3, glibc(-linuxthreads) 2.2.2
> The problem: the target does not reliably set breakpoints. Single step works
> once, then the next step takes off and continues. Set two consecutive
> breakpoints and target may or may not stop at first, but never stops at
> second. Apparently, gdbserver is not always setting up the trap. I have
> captured the remote protocol and see that the single step command is both
> sent and acknowledged ($s#73...Ack) for both the case where a single step
> works and doesn't.

If GDB sends an 's' packet, gdbserver will issue a PTRACE_SINGLESTEP
request.  If that loses control, then your kernel has failed to
implement PTRACE_SINGLESTEP correctly; take it up with your kernel.

Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

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