[PATCH] generic/typesizes.h: Add support for 32-bit arches with 64-bit types

[Vineet Gupta]

On 4/1/20 9:54 AM, Alistair Francis via Libc-alpha wrote:
> Update the default typesizes.h to match the new kernel sizes for 32-bit
> architectures with a 64-bit time_t and friends. This follows the sizes
> used for RV32 which is a y2038 safe architecture added after Linux 5.1.

ARC port is using this. So FWIW,

Reviewed-by: Vineet Gupta <vgupta@synopsys.com>
Tested-by: Vineet Gupta <vgupta@synopsys.com>

> ---
>  .../unix/sysv/linux/generic/bits/typesizes.h  | 37 +++++++++++++------
>  1 file changed, 25 insertions(+), 12 deletions(-)
> 
> diff --git a/sysdeps/unix/sysv/linux/generic/bits/typesizes.h b/sysdeps/unix/sysv/linux/generic/bits/typesizes.h
> index 4fb246ac74..05a6f6d1e5 100644
> --- a/sysdeps/unix/sysv/linux/generic/bits/typesizes.h
> +++ b/sysdeps/unix/sysv/linux/generic/bits/typesizes.h
> @@ -24,33 +24,46 @@
>  #ifndef	_BITS_TYPESIZES_H
>  #define	_BITS_TYPESIZES_H	1
>  
> -/* See <bits/types.h> for the meaning of these macros.  This file exists so
> -   that <bits/types.h> need not vary across different GNU platforms.  */
> +/* See <bits/types.h> for the meaning of these macros.	This file exists so
> +	 that <bits/types.h> need not vary across different GNU platforms.	*/
> +#if __TIMESIZE == 64 && __WORDSIZE == 32
> +/* This is the "new" y2038 types defined for architectures added after
> + * the 5.1 kernel	*/
> +# define __INO_T_TYPE		__UQUAD_TYPE
> +# define __OFF_T_TYPE		__SQUAD_TYPE
> +# define __RLIM_T_TYPE		__UQUAD_TYPE
> +# define __BLKCNT_T_TYPE	__SQUAD_TYPE
> +# define __FSBLKCNT_T_TYPE	__UQUAD_TYPE
> +# define __FSFILCNT_T_TYPE	__UQUAD_TYPE
> +# define __TIME_T_TYPE		__SQUAD_TYPE
> +# define __SUSECONDS_T_TYPE	__SQUAD_TYPE
> +#else
> +# define __INO_T_TYPE		__ULONGWORD_TYPE
> +# define __OFF_T_TYPE		__SLONGWORD_TYPE
> +# define __RLIM_T_TYPE		__ULONGWORD_TYPE
> +# define __BLKCNT_T_TYPE	__SLONGWORD_TYPE
> +# define __FSBLKCNT_T_TYPE	__ULONGWORD_TYPE
> +# define __FSFILCNT_T_TYPE	__ULONGWORD_TYPE
> +# define __TIME_T_TYPE		__SLONGWORD_TYPE
> +# define __SUSECONDS_T_TYPE	__SLONGWORD_TYPE
> +#endif
>  
>  #define __DEV_T_TYPE		__UQUAD_TYPE
>  #define __UID_T_TYPE		__U32_TYPE
>  #define __GID_T_TYPE		__U32_TYPE
> -#define __INO_T_TYPE		__ULONGWORD_TYPE
>  #define __INO64_T_TYPE		__UQUAD_TYPE
>  #define __MODE_T_TYPE		__U32_TYPE
>  #define __NLINK_T_TYPE		__U32_TYPE
> -#define __OFF_T_TYPE		__SLONGWORD_TYPE
>  #define __OFF64_T_TYPE		__SQUAD_TYPE
>  #define __PID_T_TYPE		__S32_TYPE
> -#define __RLIM_T_TYPE		__ULONGWORD_TYPE
>  #define __RLIM64_T_TYPE		__UQUAD_TYPE
> -#define	__BLKCNT_T_TYPE		__SLONGWORD_TYPE
>  #define	__BLKCNT64_T_TYPE	__SQUAD_TYPE
> -#define	__FSBLKCNT_T_TYPE	__ULONGWORD_TYPE
>  #define	__FSBLKCNT64_T_TYPE	__UQUAD_TYPE
> -#define	__FSFILCNT_T_TYPE	__ULONGWORD_TYPE
>  #define	__FSFILCNT64_T_TYPE	__UQUAD_TYPE
>  #define	__FSWORD_T_TYPE		__SWORD_TYPE
>  #define	__ID_T_TYPE		__U32_TYPE
>  #define __CLOCK_T_TYPE		__SLONGWORD_TYPE
> -#define __TIME_T_TYPE		__SLONGWORD_TYPE
>  #define __USECONDS_T_TYPE	__U32_TYPE
> -#define __SUSECONDS_T_TYPE	__SLONGWORD_TYPE
>  #define __SUSECONDS64_T_TYPE	__SQUAD_TYPE
>  #define __DADDR_T_TYPE		__S32_TYPE
>  #define __KEY_T_TYPE		__S32_TYPE
> @@ -63,7 +76,7 @@
>  #define __SYSCALL_ULONG_TYPE	__ULONGWORD_TYPE
>  #define __CPU_MASK_TYPE 	__ULONGWORD_TYPE
>  
> -#ifdef __LP64__
> +#if defined(__LP64__) || (__TIMESIZE == 64 && __WORDSIZE == 32)
>  /* Tell the libc code that off_t and off64_t are actually the same type
>     for all ABI purposes, even if possibly expressed as different base types
>     for C type-checking purposes.  */
> @@ -79,7 +92,7 @@
>  # define __STATFS_MATCHES_STATFS64  1
>  
>  /* And for getitimer, setitimer and rusage  */
> -# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 1
> +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 (__WORDSIZE == 64)
>  #else
>  # define __RLIM_T_MATCHES_RLIM64_T	0
>  
>