linux-kernel - Re: [PATCH v6 11/21] arm64: ilp32: introduce binfmt

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Message-ID: <20160107234543.GA19526@yury-N73SV>
Date:	Fri, 8 Jan 2016 02:45:43 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	<arnd@...db.de>, <catalin.marinas@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	<pinskia@...il.com>, <Prasun.Kapoor@...iumnetworks.com>,
	<schwab@...e.de>, <Nathan_Lynch@...tor.com>, <agraf@...e.de>,
	<klimov.linux@...il.com>, <broonie@...nel.org>,
	<jan.dakinevich@...il.com>, <ddaney.cavm@...il.com>,
	<bamvor.zhangjian@...wei.com>,
	<philipp.tomsich@...obroma-systems.com>, <joseph@...esourcery.com>,
	<christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH v6 11/21] arm64: ilp32: introduce binfmt_ilp32.c

On Fri, Jan 08, 2016 at 02:34:29AM +0300, Yury Norov wrote:
> to handle ILP32 binaries
> 
> Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
> ---
[...]
> diff --git a/arch/arm64/kernel/binfmt_ilp32.c b/arch/arm64/kernel/binfmt_ilp32.c
> new file mode 100644
> index 0000000..02a7a6c
> --- /dev/null
> +++ b/arch/arm64/kernel/binfmt_ilp32.c
> @@ -0,0 +1,21 @@
> +/*
> + * Support for ILP32 Linux/aarch64 ELF binaries.
> + */
> +
> +/* AARCH64 ILP32 EABI. */
> +#define compat_elf_check_arch(x)	(((x)->e_machine == EM_AARCH64)	\
> +					&& (x)->e_ident[EI_CLASS] == ELFCLASS32)
> +

Not sure about this. Originally it was just:
        #define compat_elf_check_arch(x)	(((x)->e_machine == EM_AARCH64)	\

But how than distinguish aarch64 and aarch64/ilp32 elfs?