• Chris Metcalf's avatar
    compat: fixes to allow working with tile arch · be84cb43
    Chris Metcalf authored
    The existing <asm-generic/unistd.h> mechanism doesn't really provide
    enough to create the 64-bit "compat" ABI properly in a generic way,
    since the compat ABI is a mix of things were you can re-use the 64-bit
    versions of syscalls and things where you need a compat wrapper.
    To provide this in the most direct way possible, I added two new macros
    to go along with the existing __SYSCALL and __SC_3264 macros: __SC_COMP
    and SC_COMP_3264.  These macros take an additional argument, typically a
    "compat_sys_xxx" function, which is passed to __SYSCALL if you define
    __SYSCALL_COMPAT when including the header, resulting in a pointer to
    the compat function being placed in the generated syscall table.
    The change also adds some missing definitions to <linux/compat.h> so that
    it actually has declarations for all the compat syscalls, since the
    "[nr] = ##call" approach requires proper C declarations for all the
    functions included in the syscall table.
    Finally, compat.c defines compat_sys_sigpending() and
    compat_sys_sigprocmask() even if the underlying architecture doesn't
    request it, which tries to pull in undefined compat_old_sigset_t defines.
    We need to guard those compat syscall definitions with appropriate
    __ARCH_WANT_SYS_xxx ifdefs.
    Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
    Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
compat.h 19.6 KB