From owner-freebsd-arch  Wed Jan  9  0:21:11 2002
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Date: Wed, 9 Jan 2002 19:21:45 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Daniel Eischen <eischen@pcnet1.pcnet.com>
Cc: John Baldwin <jhb@FreeBSD.ORG>, Dan Eischen <eischen@vigrid.com>,
	<arch@FreeBSD.ORG>, Doug Rabson <dfr@nlsystems.com>
Subject: Re: Getcontext resolution?
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On Tue, 8 Jan 2002, Daniel Eischen wrote:

> On Tue, 8 Jan 2002, John Baldwin wrote:
> > On 08-Jan-02 Dan Eischen wrote:
> > > Doug Rabson wrote:
> > >> I've been thinking about this and I think that possibly 'intptr_t' would
> > >> be a better type for the arguments than 'uintptr_t' since that is a signed
> > >> type.

Do you need a signed type for the args?  'intptr_t' is a strange type for
representing pointers because it is a signed type, but operations on pointers
act more like operations on unsigned types than signed ones.

> > > OK, will change it.  This is really only applicable to alpha and
> > > other 64-bit archs, though.  I've left i386 as int's since we know
> > > it's always going to be 32-bits, right?
> >
> > intptr_t is 32-bits on i386.  It's easier to just use the same type everywhere.
> > Also, you could consider the new C99 type intmax_t.
>
> intmax_t is 64 bits on i386 so it won't work.  I'm using intptr_t
> for both i386 and alpha now.
>
> Trying to use the correct type seems all well and good, but we
> are still somewhat limited to how the registers are defined in
> the machine context anyways (int for i386, and [unsigned] long
> for alpha).

Registers have type u_register_t on all machines.  There is also an
unnatural signed type register_t.

Bruce


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