[uml-devel] [PATCH] skas3 for x86_64 arch

[uml-devel] [PATCH] skas3 for x86_64 arch

[Matt Ayres]

Hi,

I just did a quick port of the skas3 patch to the x86_64 architecture. 
Everything seems very straightforward except for the do_mmap2 function. 

I don't have a x86_64 machine or an emulator so I can't even verify this
even compiles.  I would appreciate if someone able to test this could
let me know if it compiles/works and if there are any problems provide
verbose information.  If it doesn't compile, pasting the errors of the
build should be enough. If it compiles but panics I would appreciate the
oops to be run through ksymoops and that output sent.

The patch is at: http://www.tektonic.net/public/host-skas3-x86_64.patch

Thanks!

-- 
Matt Ayres <matta@tektonic.net>
TekTonic



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Re: [uml-devel] [PATCH] skas3 for x86_64 arch

[BlaisorBlade]

Alle 20:24, venerdì 20 febbraio 2004, Matt Ayres ha scritto:
> Hi,
>
> I just did a quick port of the skas3 patch to the x86_64 architecture.
> Everything seems very straightforward except for the do_mmap2 function.

Sorry, but you've changed the prototype of sys32_mmap2 by adding the mm 
parameter (which goes only on do_mmap2). So it cannot possibly compile.

-asmlinkage long sys32_mmap2(unsigned long addr, unsigned long len,
+/* common code for old and new mmaps */
+static inline long do_mmap2(struct mm_struct *mm,
+unsigned long addr, unsigned long len,
 unsigned long prot, unsigned long flags,
 unsigned long fd, unsigned long pgoff)

+
+asmlinkage long sys32_mmap2(struct mm_struct *mm,
+unsigned long addr, unsigned long len,
+unsigned long prot, unsigned long flags,
+unsigned long fd, unsigned long pgoff)
+{
+return do_mmap2(addr, len, prot, flags, fd, pgoff);
+}
+

Apart for this, I did not see anything strange (but I give a *very* quick 
look, i.e. 1 minute, so I'm not sure).
> I don't have a x86_64 machine or an emulator so I can't even verify this
> even compiles.

Have you tried a cross build with make ARCH=x86_64 ? I'm not sure if that can 
work or requires cross-compilators, but maybe not.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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Re: [uml-devel] [PATCH] skas3 for x86_64 arch

[Matt Ayres]

On Fri, 2004-02-20 at 15:55, BlaisorBlade wrote:
> Alle 20:24, venerdì 20 febbraio 2004, Matt Ayres ha scritto:
> > Hi,
> >
> > I just did a quick port of the skas3 patch to the x86_64 architecture.
> > Everything seems very straightforward except for the do_mmap2 function.
> 
> Sorry, but you've changed the prototype of sys32_mmap2 by adding the mm 
> parameter (which goes only on do_mmap2). So it cannot possibly compile.

That area confuses me, I can't find anything in the kernel that actually
uses sys32_mmap2.  I've changed it for compatibility, but i'm not sure
how it will work.  do_mmap2 doesn't exist for x86_64.  do_mmap2 did
exist in kernel 2.4.20 and I simply copied the code from there.  I've
uploaded a new patch,
https://www.tektonic.net/public/linux-2.4.25-x86_64-skas3.patch.  I
wasn't using the updated skas patch for 2.4.25 so it wouldn't have
worked anyway.  The main problem I think is that skas changes the
do_mmap_pgoff function, so I had to update the arch/x86_64/sys_x86_64.c
file also where I don't even think it will actually touch any code in
that file as UML will be running in 32-bit mode.



> 
> Have you tried a cross build with make ARCH=x86_64 ? I'm not sure if that can 
> work or requires cross-compilators, but maybe not.

Yes, I tried that and got an error very early saying it can't be done. 
The x86_64 emulator seems to cost money.  I'll have to see if i'm using
a cross compiler or not, I always thought gcc had that enabled by
default.

-- 
Matt Ayres <matta@tektonic.net>
TekTonic



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Re: [uml-devel] [PATCH] skas3 for x86_64 arch

[Cameron Patrick]

Matt Ayres wrote:

| The x86_64 emulator seems to cost money.

Have you tried Bochs?  I've not used it for x86-64 myself but it
claims to be able to do it.  'tis a bit slow, though.

Cameron.


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Re: [uml-devel] [PATCH] skas3 for x86_64 arch

[matta]

Yes, I installed bochs and just tried the AMD64 kernel provided by SuSe on
their site and when it booted up it stated my CPU wasn't capable of
64-bit.  So it looks like it does support it, but only when running under
a 64-bit CPU.  I just went out and bought an Opteron so now I really need
to get this working :)

> Matt Ayres wrote:
>
> | The x86_64 emulator seems to cost money.
>
> Have you tried Bochs?  I've not used it for x86-64 myself but it
> claims to be able to do it.  'tis a bit slow, though.
>
> Cameron.
>
>
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Re: [uml-devel] [PATCH] skas3 for x86_64 arch

[Cameron Patrick]

matta@tektonic.net wrote:

| Yes, I installed bochs and just tried the AMD64 kernel provided by SuSe on
| their site and when it booted up it stated my CPU wasn't capable of
| 64-bit.  So it looks like it does support it, but only when running under
| a 64-bit CPU.

It works for me on my Athlon XP.  (Well, I didn't try to actually do
anything with it, but the kernel prints out messages and stuff.)  This
is using the Debian unstable `bochs' package.

Screenshot- http://cp.yi.org/cameron/bochs.png

That said, a real Opteron would be a lot more practical for most
things; especially, e.g. running gcc :-)

Cameron.


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