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    SubjectRe: [PATCH v6 13/17] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it
    Date
    On Thursday 12 November 2015 10:44:55 Andreas Schwab wrote:
    > Arnd Bergmann <arnd@arndb.de> writes:
    >
    > > What do you mean with 32-bit off_t?
    >
    > An ABI with 32-bit off_t, ie. all currently implemented 32-bit ABIs.
    >
    > > Do you mean that glibc emulates a 32-bit off_t on top of the 64-bit
    > > __kernel_loff_t?
    >
    > Glibc is bridging the user-space ABI to the kernel ABI.

    Ok, but why?

    The kernel headers for all recent architectures (arc, c6x, h8300,
    hexagon, metag, nios2, openrisc, tile and unicore32) deliberately
    leave out the __kernel_off_t based system calls to simplify the
    ABI in a way that we never have to support a 32-bit off_t
    in user space.

    Are there programs that require using a 32-bit off_t by default
    on 32-bit architectures but not on 64-bit architectures?
    Did the previous version of the ilp32 patch set also emulate
    this the same way?

    Arnd


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