x86_64 linuxulator patches

[Kostik Belousov]

On Sun, Aug 10, 2008 at 04:04:24PM +0400, Chagin Dmitry wrote:
> On Sun, Aug 10, 2008 at 02:54:06PM +0300, Kostik Belousov wrote:
> > On Sun, Aug 10, 2008 at 11:20:13AM +0400, Chagin Dmitry wrote:
> > > Hi, as promised, I place x86_64 linuxulator patches.
> > > 
> > > here the basic patch:
> > > http://78.107.232.239/linuxulator64-current.patch
> > > 
> > > here recvmsg && sendmsg patch (not tested with really applications):
> > > http://78.107.232.239/send-recv-msg.patch
> > > 
> > > here master repository:
> > > git://78.107.232.239/linuxulator
> > > 
> > > and ports used for testing (and only for testing):
> > > git://78.107.232.239/linux_base-f8
> > > git://78.107.232.239/linux_devel-f8
> > > git://78.107.232.239/linux_kdump-1.6
> > > 
> > > by default on amd64 builds i386 linuxulator, for build x86_64 use
> > > cd sys/modules/linux
> > > make -D COMPAT_LINUX64
> > > 
> > > for correct recognition of what linuxulator version is used
> > > added new sysctl compat.linux.platform
> > > for example use in ports Makefile's:
> > > 
> > > LINUX_PLATFORM!=        /sbin/sysctl -n compat.linux.platform 2>/dev/null
> > > 
> > > .if ${LINUX_PLATFORM}x == "x"
> > > IGNORE=                 linuxulator is not (kld)loaded
> > > .elif ${LINUX_PLATFORM} == "i386"
> > > LINUX_RPM_ARCH=         i386
> > > .elif ${LINUX_PLATFORM} == "x86_64"
> > > LINUX_RPM_ARCH=         x86_64
> > > SFX=                    64
> > > .else
> > > IGNORE=                 ${LINUX_PLATFORM} is not supported
> > > .endif
> > > 
> > > I shal glad to remarks, proposals and results of testing.
> > > thnx
> > 
> > Reading your email, I got an impression that i386/linux and x86_64/linux
> > ABI emulators are mutually exclusive. Is this right ? I think it would
> > be most useful to be able to have them both in one kernel.
> 
> yes, it so. if there are ports working only on i386 it's necessary
> to do it. I don't know such ports :(

Whether there is a _port_ that has no amd64 counterpart for i386 one is
irrelevant there. The Linux ABI emulation is supposed to work not only with
a software installed from port, but with most binaries.

If emulating both ia32 and x86_64 simultaneously is technically feasible
(and I believe it is), then both should be available. i386->amd64 is
not the replacement step, this is an backward-compatible upgrade.
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