linux-kernel - Re: [PATCH 07/24] ARM64:ILP32: Use the same size and layout of the signal structures for ILP32 as for LP64

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Date:	Thu, 18 Sep 2014 11:41:16 +0800
From:	zhangjian <bamvor.zhangjian@...wei.com>
To:	Andrew Pinski <apinski@...ium.com>,
	zhangjian <bamvor.zhangjian@...wei.com>,
	Dingtianhong <dingtianhong@...wei.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <pinskia@...il.com>,
	Xinwei Hu <huxinwei@...wei.com>
Subject: Re: [PATCH 07/24] ARM64:ILP32: Use the same size and layout of the
 signal structures for ILP32 as for LP64

On 2014/9/4 5:19, Andrew Pinski wrote:
> Defines the macros which allow the signal structures to be the same between ILP32 and LP64.
> 
> Signed-off-by: Andrew Pinski <apinski@...ium.com>
> ---
>  arch/arm64/include/uapi/asm/siginfo.h |   33 ++++++++++++++++++++++++++++++++
>  arch/arm64/include/uapi/asm/signal.h  |   34 +++++++++++++++++++++++++++++++++
>  2 files changed, 67 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm64/include/uapi/asm/siginfo.h b/arch/arm64/include/uapi/asm/siginfo.h
> index 5a74a08..c80c612 100644
> --- a/arch/arm64/include/uapi/asm/siginfo.h
> +++ b/arch/arm64/include/uapi/asm/siginfo.h
> @@ -1,5 +1,6 @@
>  /*
>   * Copyright (C) 2012 ARM Ltd.
> + * Copyright (C) 2014 Cavium Inc.
>   *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License version 2 as
> @@ -18,6 +19,38 @@
>  
>  #define __ARCH_SI_PREAMBLE_SIZE	(4 * sizeof(int))
>  
> +#ifdef __ILP32__
> +
> +/*
> + * For ILP32, the siginfo structures should share the same layout and
> + * alignement requirements as LP64 ABI.
> + * To do this, use an extra pad field and add aligned attribute
> + * to the structure.
> + */
> +
> +# ifdef __AARCH64EB__
> +#  define __SIGINFO_INNER(type, field)		\
> +		int __pad#field;		\
> +		type field
> +# else
> +#  define __SIGINFO_INNER(type, field)		\
> +		type field;			\
> +		int __pad#field
> +# endif
> +
> +# undef __SIGINFO_VOIDPTR
> +# define __SIGINFO_VOIDPTR(field)		\
> +		__SIGINFO_INNER(void __user*, field)
> +# undef __SIGINFO_BAND
> +
> +# define __SIGINFO_BAND(field)			\
> +	__SIGINFO_INNER(long, field)
> +
> +/* Make the alignment of siginfo always 8 byte aligned. */
> +#define __ARCH_SI_ATTRIBUTES __attribute__((aligned(8)))
> +
> +#endif
> +
>  #include <asm-generic/siginfo.h>
>  
>  #endif
> diff --git a/arch/arm64/include/uapi/asm/signal.h b/arch/arm64/include/uapi/asm/signal.h
> index 8d1e723..d33a5f7 100644
> --- a/arch/arm64/include/uapi/asm/signal.h
> +++ b/arch/arm64/include/uapi/asm/signal.h
> @@ -16,9 +16,43 @@
>  #ifndef __ASM_SIGNAL_H
>  #define __ASM_SIGNAL_H
>  
> +#include <asm/posix-types.h>
typos here, it should be
#include <asm/posix_types.h>
> +
>  /* Required for AArch32 compatibility. */
>  #define SA_RESTORER	0x04000000
>  
> +/*
> + * Since sigset is a bitmask, we need the same size fields for ILP32
> + * and LP64.  With big-endian, 32bit bitmask does not match up to
> + * 64bit bitmask (unlike with little-endian).
> + */
> +#ifdef __ILP32__
> +
> +#define __SIGSET_INNER_TYPE __kernel_ulong_t
> +#define _NSIG_BPW 64
> +
> +# ifdef __AARCH64EB__
> +#  define __SIGNAL_INNER(type, field)		\
> +		int __pad_##field;		\
> +		type field;
> +# else
> +#  define __SIGNAL_INNER(type, field)		\
> +		type field;			\
> +		int __pad_##field;
> +# endif
> +
> +# define __SIGACTION_HANDLER(field)		\
> +	__SIGNAL_INNER(__sighandler_t, field)
> +
> +
> +#define __SIGACTION_FLAGS(field)		\
> +	__kernel_ulong_t field
> +
> +#define __SIGACTION_RESTORER(field)		\
> +	__SIGNAL_INNER(__sigrestore_t, field)
> +
> +#endif
> +
>  #include <asm-generic/signal.h>
>  
>  #endif
> 


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