linux-kernel - Re: [PATCH 10/18] arm64: ilp32: introduce binfmt

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Message-ID: <20161205153801.GE14429@e104818-lin.cambridge.arm.com>
Date:   Mon, 5 Dec 2016 15:38:01 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-arch@...r.kernel.org, szabolcs.nagy@....com,
        heiko.carstens@...ibm.com, cmetcalf@...hip.com,
        philipp.tomsich@...obroma-systems.com, joseph@...esourcery.com,
        zhouchengming1@...wei.com, Prasun.Kapoor@...iumnetworks.com,
        agraf@...e.de, geert@...ux-m68k.org, kilobyte@...band.pl,
        manuel.montezelo@...il.com, pinskia@...il.com,
        linyongting@...wei.com, klimov.linux@...il.com, broonie@...nel.org,
        bamvor.zhangjian@...wei.com,
        Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>,
        maxim.kuvyrkov@...aro.org, Nathan_Lynch@...tor.com,
        schwidefsky@...ibm.com, davem@...emloft.net,
        christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH 10/18] arm64: ilp32: introduce binfmt_ilp32.c

On Fri, Oct 21, 2016 at 11:33:09PM +0300, Yury Norov wrote:
> binfmt_ilp32.c is needed to handle ILP32 binaries
> 
> Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
> Signed-off-by: Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>
> ---
>  arch/arm64/include/asm/elf.h     |  6 +++
>  arch/arm64/kernel/Makefile       |  1 +
>  arch/arm64/kernel/binfmt_ilp32.c | 97 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 104 insertions(+)
>  create mode 100644 arch/arm64/kernel/binfmt_ilp32.c
> 
> diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h
> index f259fe8..be29dde 100644
> --- a/arch/arm64/include/asm/elf.h
> +++ b/arch/arm64/include/asm/elf.h
> @@ -175,10 +175,16 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm,
>  
>  #define COMPAT_ELF_ET_DYN_BASE		(2 * TASK_SIZE_32 / 3)
>  
> +#ifndef USE_AARCH64_GREG
>  /* AArch32 registers. */
>  #define COMPAT_ELF_NGREG		18
>  typedef unsigned int			compat_elf_greg_t;
>  typedef compat_elf_greg_t		compat_elf_gregset_t[COMPAT_ELF_NGREG];
> +#else /* AArch64 registers for AARCH64/ILP32 */
> +#define COMPAT_ELF_NGREG	ELF_NGREG
> +#define compat_elf_greg_t	elf_greg_t
> +#define compat_elf_gregset_t	elf_gregset_t
> +#endif

I think you only need compat_elf_gregset_t definition here and leave the
other two undefined.

-- 
Catalin