[ptxdist] 64bit kernel 32bit userspace

[ptxdist] 64bit kernel 32bit userspace

[Erwin Rol]

Hey all,

is it possible to setup ptxdist to compile a 64bit kernel and 32bit
userspace. I didn't find a way to select two different compilers, one
for the kernel and one for the userspace programms.

TIA,

Erwin

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Re: [ptxdist] 64bit kernel 32bit userspace

[Uwe Kleine-König]

Hi Erwin,

On Wed, Jul 24, 2013 at 11:31:40AM +0200, Erwin Rol wrote:
> is it possible to setup ptxdist to compile a 64bit kernel and 32bit
> userspace. I didn't find a way to select two different compilers, one
> for the kernel and one for the userspace programms.
I would expect that the kernel does the right thing with a toolchain
that defaults to 32bit. (i.e. passing -m64)

I wonder why you want such a mixed setup?!

Best regards
Uwe

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Pengutronix e.K.                           | Uwe Kleine-König            |
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Re: [ptxdist] 64bit kernel 32bit userspace

[Jürgen Beisert]

On Wednesday 24 July 2013 11:57:07 Uwe Kleine-König wrote:
> On Wed, Jul 24, 2013 at 11:31:40AM +0200, Erwin Rol wrote:
> > is it possible to setup ptxdist to compile a 64bit kernel and 32bit
> > userspace. I didn't find a way to select two different compilers, one
> > for the kernel and one for the userspace programms.
>
> I would expect that the kernel does the right thing with a toolchain
> that defaults to 32bit. (i.e. passing -m64)
>
> I wonder why you want such a mixed setup?!

Valid and useful combination for x86-64 systems.

jbe
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Pengutronix e.K.                              | Juergen Beisert             |
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Re: [ptxdist] 64bit kernel 32bit userspace

[Erwin Rol]

Hey Uwe,

On 24-7-2013 11:57, Uwe Kleine-König wrote:
> Hi Erwin,
> 
> On Wed, Jul 24, 2013 at 11:31:40AM +0200, Erwin Rol wrote:
>> is it possible to setup ptxdist to compile a 64bit kernel and 32bit
>> userspace. I didn't find a way to select two different compilers, one
>> for the kernel and one for the userspace programms.
> I would expect that the kernel does the right thing with a toolchain
> that defaults to 32bit. (i.e. passing -m64)

Does that really work, for a i686-X compiler? I thought that only worked
the other way around, a x86_64-X compiler with -m32 ?

> I wonder why you want such a mixed setup?!

To let kernel use the extra registers and MMU features of the X86_64
mode, but not to worry about userspace programs that aren't 64bit clean.

- Erwin



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