[ECOS] removing .sdata and .sbss

[ECOS] removing .sdata and .sbss

[Daeyoung Kim]

Hi,

I need to remove .sdata and .sbss section from memory layout of eCos
application.
In stead I will put all variables in .data and .bss section.

So, I tried to use -mno-sdata and -msdata=none while compiling eCos and
application,
but I failed. I am using powerpc-eabi-gcc.

Could anybody help me out?

Daeyoung Kim

Re: [ECOS] removing .sdata and .sbss

[Jonathan Larmour]

Daeyoung Kim wrote:
> 
> Hi,
> 
> I need to remove .sdata and .sbss section from memory layout of eCos
> application.
> In stead I will put all variables in .data and .bss section.
> 
> So, I tried to use -mno-sdata and -msdata=none while compiling eCos and
> application,
> but I failed. I am using powerpc-eabi-gcc.

I would definitely have thought -msdata=none would work. Are you saying that
it doesn't seem to make any difference, or does something also go wrong?

Jifl
-- 
Cygnus Solutions, 35 Cambridge Place, Cambridge, UK.  Tel: +44 (1223) 728762
"I used to have an open mind but || Get yer free open source RTOS's here...
 my brains kept falling out."    || http://sourceware.cygnus.com/ecos
Help fight spam! http://spam.abuse.net/  These opinions are all my own fault

Re: [ECOS] removing .sdata and .sbss

[Daeyoung Kim]

Dear, Jonathan,

I used option -msdata=none to compile both eCos library and example/twothread.c.

But, I got below Map file which says simple_threadA/B are
allocated to .sbss section.

 *(.sbss)
 .sbss          0x01045a44        0x8 twothreads.o
                0x01045a44                simple_threadB
                0x01045a48                simple_threadA
 .sbss          0x01045a4c        0x4
//e/eCosSeIma/install/lib/libtarget.a(libc_mainthread.o)
                0x01045a4c                __sncyg_libc_main_thread
                0x01045a50                __SBSS_END__=M(.)
                0x01045a50                __SBSS2_START__=M(.)

Did I miss anything?

Thanks for your  reply,

Daeyoung


Jonathan Larmour wrote:

> Daeyoung Kim wrote:
> >
> > Hi,
> >
> > I need to remove .sdata and .sbss section from memory layout of eCos
> > application.
> > In stead I will put all variables in .data and .bss section.
> >
> > So, I tried to use -mno-sdata and -msdata=none while compiling eCos and
> > application,
> > but I failed. I am using powerpc-eabi-gcc.
>
> I would definitely have thought -msdata=none would work. Are you saying that
> it doesn't seem to make any difference, or does something also go wrong?
>
> Jifl
> --
> Cygnus Solutions, 35 Cambridge Place, Cambridge, UK.  Tel: +44 (1223) 728762
> "I used to have an open mind but || Get yer free open source RTOS's here...
>  my brains kept falling out."    || http://sourceware.cygnus.com/ecos
> Help fight spam! http://spam.abuse.net/  These opinions are all my own fault

Re: [ECOS] removing .sdata and .sbss

[Jonathan Larmour]

Daeyoung Kim wrote:
> 
> I used option -msdata=none to compile both eCos library and example/twothread.c.
> 
> But, I got below Map file which says simple_threadA/B are
> allocated to .sbss section.
> 
>  *(.sbss)
>  .sbss          0x01045a44        0x8 twothreads.o
>                 0x01045a44                simple_threadB
>                 0x01045a48                simple_threadA
>  .sbss          0x01045a4c        0x4
> //e/eCosSeIma/install/lib/libtarget.a(libc_mainthread.o)
>                 0x01045a4c                __sncyg_libc_main_thread
>                 0x01045a50                __SBSS_END__=M(.)
>                 0x01045a50                __SBSS2_START__=M(.)
> 
> Did I miss anything?

Sorry for the huge delay in replying - this was buried in my e-mail and I
didn't spend time looking at this. Gary Thomas here just did, and it looks
like you have found an inconsistency in the way gcc handles its arguments.
As a workaround, can you try also using "-G 0" as well as (or possibly even
instead of) -msdata=none? I haven't tried it but it may fix your problem for
now.

Jifl
-- 
Cygnus Solutions, 35 Cambridge Place, Cambridge, UK.  Tel: +44 (1223) 728762
"I used to have an open mind but || Get yer free open source RTOS's here...
 my brains kept falling out."    || http://sourceware.cygnus.com/ecos
Help fight spam! http://spam.abuse.net/  These opinions are all my own fault