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Re: Trying to port libffi to OpenVMS.
- From: "John E. Malmberg" <wb8tyw at qsl dot net>
- To: Richard Henderson <rth at redhat dot com>, libffi-discuss at sourceware dot org
- Date: Fri, 13 Feb 2015 17:48:49 -0600
- Subject: Re: Trying to port libffi to OpenVMS.
- Authentication-results: sourceware.org; auth=none
- References: <54DE0378 dot 8040609 at qsl dot net> <54DE0D25 dot 8020300 at redhat dot com>
On 2/13/2015 8:41 AM, Richard Henderson wrote:
On 02/13/2015 06:00 AM, John E. Malmberg wrote:
I was able to apply Philippe Vouters patches for Libffi 3.0.9 to libffi 3.1 and
get the code building. I was unable to get the tests to run under GNV though.
I've never seen those patches but...
Not sure if I got them via E-mail from someone else, or from his site.
His site is not responding at this time.
The readme says that they include HP-UX/ia64 and VMS/Alpha and VMS/ia64.
What I have appears to be bunch of concatenated unified diffs. I can
gzip it and forward it to anyone that is interested, uncompressed it is
126 KB.
I am now trying to build master from a git checkout, and have gotten lost with
the changes to src/alpha/ffi.c since then, so I am looking for some guidance on
how to get libffi from master building.
... I know that the ABI for vms is significantly different from unix.
I'd be surprised if the patches were small.
I think VMS and Tru64 share a calling standard on Alpha, but I am not
sure. VMS on Itanium uses ELF binaries and calling standard with a few
extensions to ELF.
In any case, on VMS, the "int lib$callg(void **args, int (*func)())"
hides all that though.
I don't know that there's a wiki, per se...
That is what the text at that web site says. It actually implies that
it is posted on a WIKI.
What I should have done is read the libffi online manual instead of
trying just to understand what Philippe did.
The use of the lib$callg() routine means I should not need any assembly
language code at all. Probably almost the same source for all three
current VMS harware platforms.
Thanks for the reply.
Regards,
-John