Davide Libenzi wrote:
>
> On Fri, 30 Nov 2001, Brian Gerst wrote:
>
> > Davide Libenzi wrote:
> > >
> > > On Fri, 30 Nov 2001, Simon Turvey wrote:
> > >
> > > > Is it possible to arbitrarily generate (in a module say) a function call
> > > > trace?
> > >
> > > gcc has builtin macros to trace back or ( on x86 ) you can simply chain
> > > through %esp/%ebp
> >
> > That only works if you compile with frame pointers, which the kernel
> > turns off for performance reasons (due to register pressure on the x86).
>
> I thought it was a general question not a kernel code one.
> Sure -fomit-frame-pointer is on inside the kernel.
With the , well exception, of the scheduler, which does the task
switching by
overwriting his own return address on the stack by the address of the
next jump point in a process, and needs the frame
pointer therefore ;-).
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This archive was generated by hypermail 2b29 : Fri Nov 30 2001 - 21:00:40 EST