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Subject: Re: [PATCH] powerpc: Don't use ELFv2 ABI to build the kernel
From: Scott Wood <scottwood@freescale.com>
To: Alistair Popple <alistair@popple.id.au>
Date: Mon, 18 Nov 2013 13:29:25 -0600
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On Mon, 2013-11-18 at 17:21 +1100, Alistair Popple wrote:
> The kernel doesn't build correctly using the ELFv2 ABI.  This patch
> ensures that the ELFv1 ABI is used when building a kernel with an
> ELFv2 enabled compiler.
> 
> Signed-off-by: Alistair Popple <alistair@popple.id.au>
> ---
>  arch/powerpc/Makefile | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 607acf5..8a24636 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -111,6 +111,7 @@ endif
>  endif
>  
>  CFLAGS-$(CONFIG_PPC64)	:= -mtraceback=no -mcall-aixdesc
> +CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv1)
>  CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mcmodel=medium,-mminimal-toc)
>  CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mno-pointers-to-nested-functions)
>  CFLAGS-$(CONFIG_PPC32)	:= -ffixed-r2 $(MULTIPLEWORD)

How hard would it be to get the kernel to work with the new ABI?

Do you know where I can find a document for it?

-Scott