* [Help] How to build mini-OS with libc support, like Newlib?
@ 2014-09-02 7:20 Lele MA
2014-09-02 7:47 ` Samuel Thibault
0 siblings, 1 reply; 6+ messages in thread
From: Lele MA @ 2014-09-02 7:20 UTC (permalink / raw)
To: xen-devel
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Hi all,
I am going to write my own applications in miniOS, and find it can't call the function xs_open which is available only if HAVE_LIBC is defined.
According to the README in mini-os, it suggests seeing the stubdom/ directory. But I still can not find how to do it.
So, does anyone know how to build mini-os with much better libc support?
If Newlib can be used to build mini-os, how to do it? Do I have to compile a cross-compiler first?
Any help will be appreciated. Thanks in advance!
--
Best Regards,
Lele MA
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Help] How to build mini-OS with libc support, like Newlib?
2014-09-02 7:20 [Help] How to build mini-OS with libc support, like Newlib? Lele MA
@ 2014-09-02 7:47 ` Samuel Thibault
2014-09-02 9:36 ` Lele Ma
0 siblings, 1 reply; 6+ messages in thread
From: Samuel Thibault @ 2014-09-02 7:47 UTC (permalink / raw)
To: Lele MA; +Cc: xen-devel
Lele MA, le Tue 02 Sep 2014 15:20:32 +0800, a écrit :
> If Newlib can be used to build mini-os, how to do it? Do I have to compile a
> cross-compiler first?
Yes. But this all already handled by the Makefile in stubdom/, and see
the end of README about the c-stubdom target which builds the c/
directory.
Samuel
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Help] How to build mini-OS with libc support, like Newlib?
2014-09-02 7:47 ` Samuel Thibault
@ 2014-09-02 9:36 ` Lele Ma
2014-09-02 10:55 ` Samuel Thibault
0 siblings, 1 reply; 6+ messages in thread
From: Lele Ma @ 2014-09-02 9:36 UTC (permalink / raw)
To: Samuel Thibault, xen-devel
On Tue, Sep 2, 2014 at 3:47 PM, Samuel Thibault
<samuel.thibault@ens-lyon.org> wrote:
>
> Lele MA, le Tue 02 Sep 2014 15:20:32 +0800, a écrit :
> > If Newlib can be used to build mini-os, how to do it? Do I have to compile a
> > cross-compiler first?
>
> Yes. But this all already handled by the Makefile in stubdom/, and see
> the end of README about the c-stubdom target which builds the c/
> directory.
>
Thank you so much! It is great to build newlib so conveniently. But
when I run 'make c-stubdom' in stubdom/, it yields:
make: *** No rule to make target `mini-os-x86_64-c', needed by
`c-stubdom'. Stop"
Do you have any idea about how this happen?
BTW, after building xen, there is a new directory named
"newlib-x86_64/' in stubdom/. I am a newbie to newlib and don't know
what's this exactly. Is it the newlib that a stubdomain can use as the
libc?
My xen version is 4.4.0 and dom-0 is Ubuntu-12.04. Thank you for your patience!
Best regards,
Lele MA
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Help] How to build mini-OS with libc support, like Newlib?
2014-09-02 9:36 ` Lele Ma
@ 2014-09-02 10:55 ` Samuel Thibault
2014-09-05 8:40 ` Lele MA
0 siblings, 1 reply; 6+ messages in thread
From: Samuel Thibault @ 2014-09-02 10:55 UTC (permalink / raw)
To: Lele Ma; +Cc: xen-devel
Lele Ma, le Tue 02 Sep 2014 17:36:36 +0800, a écrit :
> On Tue, Sep 2, 2014 at 3:47 PM, Samuel Thibault
> <samuel.thibault@ens-lyon.org> wrote:
> >
> > Lele MA, le Tue 02 Sep 2014 15:20:32 +0800, a écrit :
> > > If Newlib can be used to build mini-os, how to do it? Do I have to compile a
> > > cross-compiler first?
> >
> > Yes. But this all already handled by the Makefile in stubdom/, and see
> > the end of README about the c-stubdom target which builds the c/
> > directory.
> >
>
> Thank you so much! It is great to build newlib so conveniently. But
> when I run 'make c-stubdom' in stubdom/, it yields:
>
> make: *** No rule to make target `mini-os-x86_64-c', needed by
> `c-stubdom'. Stop"
>
> Do you have any idea about how this happen?
It's been years since I have had a look at that build system :)
Apparently the c target somehow gets disabled, but you can add it by
hand in
TARGETS=$(STUBDOM_TARGETS) c
> BTW, after building xen, there is a new directory named
> "newlib-x86_64/' in stubdom/. I am a newbie to newlib and don't know
> what's this exactly. Is it the newlib that a stubdomain can use as the
> libc?
That's it, yes.
Samuel
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Help] How to build mini-OS with libc support, like Newlib?
2014-09-02 10:55 ` Samuel Thibault
@ 2014-09-05 8:40 ` Lele MA
2014-09-06 9:54 ` Samuel Thibault
0 siblings, 1 reply; 6+ messages in thread
From: Lele MA @ 2014-09-05 8:40 UTC (permalink / raw)
To: Samuel Thibault; +Cc: xen-devel
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在 2014-09-02 06:55:35，"Samuel Thibault" <samuel.thibault@ens-lyon.org> 写道：
>Lele Ma, le Tue 02 Sep 2014 17:36:36 +0800, a écrit :
>> On Tue, Sep 2, 2014 at 3:47 PM, Samuel Thibault
>> <samuel.thibault@ens-lyon.org> wrote:
>> >
>> > Lele MA, le Tue 02 Sep 2014 15:20:32 +0800, a écrit :
>> > > If Newlib can be used to build mini-os, how to do it? Do I have to compile a
>> > > cross-compiler first?
>> >
>> > Yes. But this all already handled by the Makefile in stubdom/, and see
>> > the end of README about the c-stubdom target which builds the c/
>> > directory.
>> >
>>
>> Thank you so much! It is great to build newlib so conveniently. But
>> when I run 'make c-stubdom' in stubdom/, it yields:
>>
>> make: *** No rule to make target `mini-os-x86_64-c', needed by
>> `c-stubdom'. Stop"
>>
>> Do you have any idea about how this happen?
>
>It's been years since I have had a look at that build system :)
>
>Apparently the c target somehow gets disabled, but you can add it by
>hand in
>
>TARGETS=$(STUBDOM_TARGETS) c
>
Samuel, Thank you so much, it helps!
But I have to disable the CONFIG_TEST in /stubdom/c/minios.cfg, or it yields multiple definition:
/media/wind/lab/xen/xen/xen-4.4.0/stubdom/mini-os-x86_64-c/test.o: In function `app_main':
/media/wind/lab/xen/xen/xen-4.4.0/extras/mini-os/test.c:542: multiple definition of `app_main'
/media/wind/lab/xen/xen/xen-4.4.0/stubdom/mini-os-x86_64-c/main.o:/media/wind/lab/xen/xen/xen-4.4.0/extras/mini-os/main.c:187: first defined here
Does the stubdomain allow only one app_main to run?
I have tried adding "__attribute__((weak))" before "int app_main()" in main.c, so that it will be replaced by the new definition in test.c. It builds well but the VM cannot be created with yielding erros.
Another question confuses me a lot. The c-stub domain exit immediately after prints the "Hello world" defined in /stubdom/c/main.c. And the console functions defined in /extras/mini-os/console/console.c has no effect at all. So, how can I enable the console functions?
The configurations and Makefiles overwhelm me. Any help would be appreciated.
Apologies if questions are too naive.
Best regards,
Lele MA
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Help] How to build mini-OS with libc support, like Newlib?
2014-09-05 8:40 ` Lele MA
@ 2014-09-06 9:54 ` Samuel Thibault
0 siblings, 0 replies; 6+ messages in thread
From: Samuel Thibault @ 2014-09-06 9:54 UTC (permalink / raw)
To: Lele MA; +Cc: xen-devel
Lele MA, le Fri 05 Sep 2014 16:40:11 +0800, a écrit :
> Does the stubdomain allow only one app_main to run?
Well, yes, sure, just like you can't have several main function in a C
program. This is apparently a spurious change, I have submitted a patch
removing it, thanks for the report.
> Another question confuses me a lot. The c-stub domain exit immediately after prints the "Hello world" defined in /stubdom/c/main.c.
Yes, that's just a hello world example.
> And the console functions defined in /extras/mini-os/console/console.c has no effect at all. So, how can I enable the console functions?
Which function, precisely?
The C stubdom is supposed to provide you with a C environment, so you
should just use printf.
Samuel
^ permalink raw reply [flat|nested] 6+ messages in thread
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2014-09-02 7:20 [Help] How to build mini-OS with libc support, like Newlib? Lele MA
2014-09-02 7:47 ` Samuel Thibault
2014-09-02 9:36 ` Lele Ma
2014-09-02 10:55 ` Samuel Thibault
2014-09-05 8:40 ` Lele MA
2014-09-06 9:54 ` Samuel Thibault
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