Stuart Hughes wrote:
> Felix Radensky wrote:
> >
> > [EMAIL PROTECTED] wrote:
> >
> > > On Thu, Oct 28, 1999 at 01:21:07PM +0200, Felix Radensky wrote:
> > > > Hi,
> > > >
> > > > I've applied rtl v1.3 to linux-2.0.37 and changed
> > > > CFLAGS to -Wall -Wstrict-prototypes -O2 -fno-omit-frame-pointer
> > > > -fno-strength-reduce
> > > > The difference is -fno-omit-frame-pointer flag, that is needed for
> > > > proper stack trace
> > > > debugging. The kernel just cannot boot. The normal kernel boots fine.
> > > > Any ideas would
> > > > be greatly appreciated.
> > >
> > > Do you mean that the normal kernel boots fine when compiled with those
> >
> > Exactly. Some kernel debuggers require kernel to be compiled with -g
> > -fno-omit-frame-pointers
> > in order for stack backtracing to work properly. This is true for kdb
> > (http://reality.sgi.com/slurn_engr/)
> > and ikd (ftp://e-mind.com/pub/andrea/ikd/). GCC-HOWTO also says that
> > -fno-omit-frame-pointers
> > should be used for debugging.
> > Normal kernels (I've tried 2.0.35, 2.0.36 & 2.0.37 ) when compiled with
> > this flag (gcc-2.7.2.3) boot
> > ok. With kernels patched with rtl (v1.2 & v1.3) the system prints
> > "Loading linux ..." and reboots immediately.
> >
> > By the way, 2.2.13 kernel patched with rtl v2.0 and compiled with
> > -fno-omit-frame-pointers has no problems booting. But since we use
> > 2.0.x series kernel, it would be nice to have rtl working as expected
> > with these kernels also.
> >
>
> Hi Felix,
>
> I don't know if this helps you, but I use a modified gsbstubs patch to
> do Linux kernel debugging. The combination I use is Linux 2.0.36 + RTL
> 0.9J (which are close to what you have). If I look in the Linux
> Makefile, the CFLAGS are:
>
> CFLAGS = -Wall -Wstrict-prototypes -O2 -g -fomit-frame-pointer
> -fno-strength-reduce
>
> This work without any problem, using host/target debug over a serial
> line (the host has the unstripped vmlinux, the target the zImage).
>
> The gsbstubs package can be found at:
>
> ftp://ftp.gcom.com/pub/linux/src/gdbstub-2.0.36/
>
> Note: this works for 2.2 as well despite the name.
>
> Regards
>
> Stuart.
Hi, Stuart
We are using almost the same configuration: Linux 2.0.35 + RTL 0.9F +
gdbstub-2.0.36.
But we have problems viewing the values of local variables and tracing the
function calls.
I thought that compiling the kernel with -fno-omit-frame-pointers should solve
the problem.
Are you saying that in your configuration all our problems is not an issue ?
Thank you.
Felix.
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