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author | Roland McGrath <roland@redhat.com> | 2008-07-25 19:45:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-26 12:00:09 -0700 |
commit | 64b1208d5b0ef8859fd52ea7ae286a3eb994669b (patch) | |
tree | ebb92b717406dc104924c4ccdedf14357a62b84f /fs/coda | |
parent | b787f7ba677840da16a2228c16571ce8a1fcb799 (diff) | |
download | op-kernel-dev-64b1208d5b0ef8859fd52ea7ae286a3eb994669b.zip op-kernel-dev-64b1208d5b0ef8859fd52ea7ae286a3eb994669b.tar.gz |
tracehook: TIF_NOTIFY_RESUME
This adds tracehook.h inlines to enable a new arch feature in support of
user debugging/tracing. This is not used yet, but it lays the groundwork
for a debugger to be able to wrangle a task that's possibly running,
without interrupting its syscalls in progress.
Each arch should define TIF_NOTIFY_RESUME, and in their entry.S code treat
it much like TIF_SIGPENDING. That is, it causes you to take the slow path
when returning to user mode, where you get the full user-mode state
accessible as for signal handling or ptrace. The arch code should check
TIF_NOTIFY_RESUME after handling TIF_SIGPENDING. When it's set, clear it
and then call tracehook_notify_resume().
In future, tracing code will call set_notify_resume() when it wants to get
a callback in tracehook_notify_resume().
Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/coda')
0 files changed, 0 insertions, 0 deletions