Subject: re: netbsd32 vs ktrace/kdump
To: Eduardo Horvath <eeh@NetBSD.org>
From: matthew green <email@example.com>
Date: 01/15/2004 11:58:19
On Wed, Jan 14, 2004 at 03:24:54PM +1100, matthew green wrote:
> i've been looking at fixing up the remaining issues with compat/netbsd32.
> one of them is ktrace/kdump. currently this doesn't work very well.. there
> is little interpretation of arguments, the arguments are wrong in some
> cases anyway, etc..
> i have patches to kdump that allow 32 bit apps on 64 bit kernels to be
> traced - but so far only with the 64 bit kdump. there are multiple cases
> that could be supported but i think something like this should work:
Did that break?
did what break? i added code to kdump(1) to handle 32 bit argument
types... it works fine, given a 64 bit kdump(1). though i think i
may be able to change this to require fewer changes...
I don't think trying to get a 32-bit ktrace/kdump working on 64-bit
kernels is worth the effort.
after playing around with it a bit last night, i've come to that
conclusion as well... i think the best idea is to basically make
kdump(1) just work. the hard part is detection of the format..
i've been playing with a version record, but it's still awfully
hard because of the variable size of "struct ktr_header" (even
though userland _doesn't use_ the variable part! oh the pain.)