From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin-apps@cygwin.com
Subject: Re: ffcall
Date: Thu, 19 Feb 2015 09:38:00 -0000 [thread overview]
Message-ID: <20150219093852.GA4783@calimero.vinschen.de> (raw)
In-Reply-To: <54E51500.8070200@cornell.edu>
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On Feb 18 17:41, Ken Brown wrote:
> On 2/18/2015 3:08 PM, Corinna Vinschen wrote:
> >On Feb 18 13:28, Yaakov Selkowitz wrote:
> >>On Wed, 2015-02-18 at 13:49 -0500, Ken Brown wrote:
> >>>I've been trying to adopt Reini's packages that have not yet been ported to
> >>>64-bit Cygwin and that have some connection to packages I already maintain. The
> >>>next one on my list is ffcall.
> >>
> >>I'm guessing this is for clisp? (In Fedora, clisp is the only package
> >>which BR: ffcall).
> >>
> >>>Unfortunately, the source has a lot of assembler code in it, so I will almost
> >>>certainly need help from someone well versed in x86_64 assembly language. And
> >>>the libffcall project appears to be dead upstream, so I'm not going to get help
> >>>there.
> >>
> >>Unless you can find a patch somewhere for Win64 support.
> >>
> >>>I have no idea how hard this will be. The code has been ported to x86_64 Linux,
> >>>so there's at least a starting point.
> >
> >What is ffcall doing? What functions does it call?
>
> I don't know much about it yet. Here's an overview:
>
> ffcall - foreign function call libraries
>
> This is a collection of four libraries which can be used to build
> foreign function call interfaces in embedded interpreters.
>
> The four packages are:
>
> avcall - calling C functions with variable arguments
>
> vacall - C functions accepting variable argument prototypes
>
> trampoline - closures as first-class C functions
>
> callback - closures with variable arguments as first-class C functions
> (a reentrant combination of vacall and trampoline)
>
> All except callback are written in assembler.
Dunno about trampoline, but avcall and vacall shouldn't be too hard.
It's just juggling around register and stack usage a bit, probably.
> >Help with basic x86_64 assembler is ok, I did it for Cygwin with help
> >from Kai Tietz.
> >
> >The main difference to Linux you have to look out for is the different
> >calling convention and how the registers are used:
> >http://en.wikipedia.org/wiki/X86_calling_conventions#Microsoft_x64_calling_convention
> >
> >So the job is typically to rearrange the register usage and to
> >account for the only four registers used for the first arguments
> >to a function, rather than the 6 registers in the SYSV ABI.
>
> I might give it a try at some point, but I'm not highly motivated unless
> someone who really cares about clisp steps forward to help. I'll
> concentrate first on seeing if I can get some 64-bit version of clisp built
> without ffcall.
Thanks,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2015-02-19 9:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-18 18:49 ffcall Ken Brown
2015-02-18 19:28 ` ffcall Yaakov Selkowitz
2015-02-18 20:08 ` ffcall Corinna Vinschen
2015-02-18 22:41 ` ffcall Ken Brown
2015-02-19 9:38 ` Corinna Vinschen [this message]
2015-02-19 15:43 ` ffcall Reini Urban
2015-02-19 16:45 ` ffcall Ken Brown
2015-02-19 17:18 ` ffcall Ken Brown
2015-02-19 17:44 ` ffcall Corinna Vinschen
2015-02-19 18:47 ` ffcall Ken Brown
2015-02-19 19:46 ` ffcall Reini Urban
2015-02-19 22:30 ` ffcall Ken Brown
2015-02-21 10:03 ` ffcall David Billinghurst
2015-02-21 17:16 ` ffcall Ken Brown
2015-02-21 20:43 ` ffcall Achim Gratz
2015-02-21 21:04 ` ffcall Achim Gratz
2015-02-23 11:38 ` ffcall Corinna Vinschen
2015-02-23 17:48 ` ffcall Achim Gratz
2015-02-23 20:32 ` ffcall Corinna Vinschen
2015-02-23 20:56 ` ffcall Achim Gratz
2015-02-21 3:45 ` ffcall Ken Brown
2015-02-21 12:59 ` ffcall Reini Urban
2015-02-21 17:20 ` ffcall Ken Brown
2015-02-18 22:17 ` ffcall Ken Brown
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