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From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: Richard Jones <rich@annexia.org>
Cc: caml-list@inria.fr, caml-bugs@pauillac.inria.fr
Subject: Re: [Caml-list] THREADED_CODE: Why CODE32 defined on x86-64?
Date: Wed, 16 Nov 2005 16:21:23 +0100	[thread overview]
Message-ID: <437B4E73.5020503@inria.fr> (raw)
In-Reply-To: <20051116152330.GA9895@furbychan.cocan.org>

> Why is CODE32 defined on the x86-64 architecture?  This architecture
> has 64 bit pointers, and it seems like it's only by luck that the
> bytecode interpreter normally works.

No, it's not by luck: the x86-64 ABI defines several "code models",
one of which -- the "small code model" -- guarantees that code and
static data is in the lower 2G of the address space, and is the
default for gcc (and I suspect other compilers as well).

I would have expected the dynamic loader to implement the small model
like the static linker does, but from what you say it's not the case.

- Xavier Leroy


  reply	other threads:[~2005-11-16 15:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-11-16 15:23 Richard Jones
2005-11-16 15:21 ` Xavier Leroy [this message]
2005-11-16 16:36   ` [Caml-list] " Richard Jones
2005-11-16 18:55   ` skaller

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