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Date: Mon, 8 Aug 2016 04:24:29 +0300
From: Solar Designer <solar@...nwall.com>
To: writeonce@...ipix.org
Cc: john-dev@...ts.openwall.com
Subject: x86-64.S Win64 support

Bringing this from john-users to john-dev, as it's about the source code:

On Sun, Aug 07, 2016 at 05:47:57PM -0700, writeonce@...ipix.org wrote:
> As part of alpha release preparation we've added JtR to midipix_build.sh
> for inclusion in the release tarball. After reading this thread I went
> on to test the binary, then realized that x86-64.S was still an open
> issue due to the different calling conventions. As all global functions
> in x86-64.S take two arguments at the most, I went ahead and patched the
> relevant spots using #ifdef __PE__ and a push-mov-pop wrapping method
> (note that in the WIN64 ABI, both %rdi and %rsi are nonvolatile
> registers). After applying the attached patch, all tests passed.
> Attached log is from a Dell Latitude E5450, JtR built with -g3 -O2, musl
> libc and libpsxscl built with -g3 -O0.

Thanks for the patch.

Looking at x86-64.S in jumbo, I see it also saves/restores %xmm6 through
%xmm15 when building for Win64.  Perhaps this is unnecessary in a build
with midipix, since musl does not currently use those registers and JtR
core does not use any other libraries.  But this may be something to
include if I apply a patch like this to the core tree.  Or at least
there should be a comment added about this piece missing.  Otherwise it
could be an unpleasant surprise to someone when things are neither fully
working nor fully broken in a non-midipix Win64 build of the core tree.

Alexander

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