Adds a stub for a function that will return the AUDIT_ARCH_* value
appropriate to the supplied task based on the system call convention.

For audit's use, the value can generally be hard-coded at the
audit-site.  However, for other functionality not inlined into syscall
entry/exit, this makes that information available.  seccomp_filter is
the first planned consumer and, as such, the comment indicates a tie to
CONFIG_HAVE_ARCH_SECCOMP_FILTER.
Suggested-by: NRoland McGrath <mcgrathr@chromium.org>
Signed-off-by: NWill Drewry <wad@chromium.org>
Acked-by: NSerge Hallyn <serge.hallyn@canonical.com>
Acked-by: NEric Paris <eparis@redhat.com>

v18: comment and change reword and rebase.
v14: rebase/nochanges
v13: rebase on to 88ebdda6
v12: rebase on to linux-next
v11: fixed improper return type
v10: introduced
Signed-off-by: NJames Morris <james.l.morris@oracle.com>

Only 32 bits of system call number are meaningful, so make the
specification for syscall_get_nr() be to return int, not long.
Signed-off-by: NRoland McGrath <roland@redhat.com>

Fix some pasto's in comments in the new linux/tracehook.h and
asm-generic/syscall.h files.
Reported-by: NWenji Huang <wenji.huang@oracle.com>
Signed-off-by: NRoland McGrath <roland@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This adds asm-generic/syscall.h, which documents what a real
asm-ARCH/syscall.h file should define.  This is not used yet, but will
provide all the machine-dependent details of examining a user system call
about to begin, in progress, or just ended.

Each arch should add an asm-ARCH/syscall.h that defines all the entry
points documented in asm-generic/syscall.h, as short inlines if possible.
This lets us write new tracing code that understands user system call
registers, without any new arch-specific work.
Signed-off-by: NRoland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>