Re: [ECOS] arm-thumb advice needed

Re: [ECOS] arm-thumb advice needed

[Jonathan Larmour]

Cristian VLASIN wrote:
> 
>                 Hi all,
> 
>         I'm trying to compile my eCos with thumb and I think something is wrong
> because my binary gets bigger than the non-thumb one.
>         Here is what I have done:
>                 -built the binutils as described for thumb on eCos webpage
> http://sources.redhat.com/ecos/tools/linux-thumb-elf.html  (it seems to me
> that the page is similar with the simple arm one - should it be so?)
>                 -built gcc (3.0.3) also as described there
>                 -copied an example of redboot (which I have previously compiled for my
> EB40 card)
>                 -adjusted compiler flags with "-mthumb-interworking" and activated
> thumb+interworking in HAL (it doesn't compile with simple "-mthumb")
>                 -compiled and obtained a binary which is larger than the first one
> 
>         Can anyone tell me if I'm right or give me some advice to make it right?

No, -mthumb is what you need, and explains why you're seeing larger
binaries - they are still ARM mode executables, but with extra bits in to
allow it to link with thumb code.

At a guess it doesn't compile because you haven't built your GCC with a
thumb multilib, resulting in errors when linking with libgcc. If so you
need to edit gcc/config/arm/t-arm-elf and rebuild gcc.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss

Re: [ECOS] arm-thumb advice needed

[Jesper Skov]

On Fri, 2002-03-22 at 17:06, Cristian VLASIN wrote:
> 		-compiled and obtained a binary which is larger than the first one

At a guess, your mistaking the ELF executable for a binary file. It's
not. Do arm-elf-size on the file to get the true size.

Jesper


-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss

[ECOS] arm-thumb advice needed

[Cristian VLASIN]

		Hi all, 

	I'm trying to compile my eCos with thumb and I think something is wrong 
because my binary gets bigger than the non-thumb one. 
	Here is what I have done: 
		-built the binutils as described for thumb on eCos webpage 
http://sources.redhat.com/ecos/tools/linux-thumb-elf.html  (it seems to me 
that the page is similar with the simple arm one - should it be so?)
		-built gcc (3.0.3) also as described there
		-copied an example of redboot (which I have previously compiled for my
EB40 card)
		-adjusted compiler flags with "-mthumb-interworking" and activated 
thumb+interworking in HAL (it doesn't compile with simple "-mthumb") 
		-compiled and obtained a binary which is larger than the first one

	Can anyone tell me if I'm right or give me some advice to make it right?

	Thanks in advance,
			Cris
	

-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss