DragonFly kernel List (threaded) for 2005-05
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Re: The time has come for a kernel interfacing library layer
On Sun, May 08, 2005 at 02:52:53PM -0700, Matthew Dillon wrote:
>
> :On Sun, May 08, 2005 at 11:33:53AM -0700, Matthew Dillon wrote:
> :> Well, if we go the cerror() route for the compatibility layer, that
> :> means this layer cannot just be mapped but instead must run through
> :> a relocation / ELF pass.
> :
> :I think we can even avoid that. We push a stack frame to return into
> :cerror() onto the stack which the compat layer can return too. We have
> :to keep that in mind when doing the argument calculation, but that
> :should be easy to handle.
> :
> :Joerg
>
> The problem is where does the function address of cerror come
> from ? This library is implementing a system call, the function returns
> to the caller, not to cerror. I definitely do not want to hack up
> the stack frame.
I wanted to put an intermediate stack frame there. We need it anyway for
the internal compatibility handling in libc, even it adds another stack
frame for the "normal" case.
Joerg
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