Re: [PATCH] kgdb-x86_64-support.patch for 2.6.2-rc1-mm3

[Jim Houston]

On Mon, 2004-01-26 at 22:28, Andrew Morton wrote:
> Jim Houston <jim.houston@xxxxxxxxxxx> wrote:
> >
> > The attached patch updates my kgdb-x86_64-support.patch to work
> >  with linux-2.6.2-rc1-mm3.
> 
> Thanks.  Why does it relocate the call to trap_init() in start_kernel()?

Hi Andrew,

Moving trap_init() before parse_args() makes the "gdb" command line
option work.

On the i386 George has a few lines of code in breakpoint() which do 
enough setup to allow a break point trap to enter kgdb early in the
boot.  I played with similar code on x86_64, but it didn't work.
Handling a break point trap requires some of the initialization
done in cpu_init().  I suspect the difference is the per-cpu-data
referenced using %gs.

Jim Houston - Concurrent Computer Corp.

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