linux-toradex.git/arch/xtensa/kernel/signal.c, branch v3.4.38

xtensa: fix build failure in xtensa/kernel/signal.c

2012-04-23T16:24:55+00:00

Caused by commit 3785006ac3c8941feb63097c416de92114a6bc39

    "xtensa: don't mask signals if we fail to setup signal stack"

It assigns a return value to "ret", but there is no such variable
anywhere in scope.  Create one.

Cc: Oleg Nesterov 
Cc: Chris Zankel 
Acked-by: Matt Fleming 
Signed-off-by: Paul Gortmaker

xtensa: use set_current_blocked() and block_sigmask()

2012-03-22T00:54:55+00:00

As described in commit e6fa16ab9c1e ("signal: sigprocmask() should do
retarget_shared_pending()") the modification of current->blocked is
incorrect as we need to check whether the signal we're about to block is
pending in the shared queue.

Also, use the new helper function introduced in commit 5e6292c0f28f
("signal: add block_sigmask() for adding sigmask to current->blocked")
which centralises the code for updating current->blocked after
successfully delivering a signal and reduces the amount of duplicate code
across architectures.  In the past some architectures got this code wrong,
so using this helper function should stop that from happening again.

Acked-by: Oleg Nesterov 
Cc: Chris Zankel 
Signed-off-by: Matt Fleming 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

xtensa: don't mask signals if we fail to setup signal stack

2012-03-22T00:54:55+00:00

setup_frame() needs to return an indication of whether it succeeded or
failed in setting up the signal stack frame.  If setup_frame() fails then
we must not modify current->blocked.

Acked-by: Oleg Nesterov 
Cc: Chris Zankel 
Signed-off-by: Matt Fleming 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

xtensa: no need to reset handler if SA_ONESHOT

2012-03-22T00:54:55+00:00

get_signal_to_deliver() already resets the signal handler if SA_ONESHOT
is set in ka->sa.sa_flags, there's no need to do it again in
handle_signal().

Furthermore, because we were modifying ka->sa.sa_handler (which is a
copy of sighand->action[]) instead of sighand->action[] the original
code actually had no effect on signal delivery.

Acked-by: Oleg Nesterov 
Cc: Chris Zankel 
Signed-off-by: Matt Fleming 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

xtensa: don't reimplement force_sigsegv()

2012-03-22T00:54:55+00:00

Instead of open coding the sequence from force_sigsegv() just call it.
This also fixes a bug because we were modifying ka->sa.sa_handler (which
is a copy of sighand->action[]), whereas the intention of the code was to
modify sighand->action[] directly.

As the original code was working with a copy it had no effect on signal
delivery.

Acked-by: Oleg Nesterov 
Cc: Chris Zankel 
Signed-off-by: Matt Fleming 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[XTENSA] Add support for the sa_restorer function

2008-02-14T01:42:31+00:00

Supporting the sa_restorer function allows for better security
since the sigreturn system call doesn't need to be placed on
the stack, so the stack doesn't need to be executable. This
requires support from the c-library as it has to provide the
restorer function.

Signed-off-by: Chris Zankel

[XTENSA] Add support for configurable registers and coprocessors

2008-02-14T01:41:43+00:00

The Xtensa architecture allows to define custom instructions and
registers. Registers that are bound to a coprocessor are only
accessible if the corresponding enable bit is set, which allows
to implement a 'lazy' context switch mechanism. Other registers
needs to be saved and restore at the time of the context switch
or during interrupt handling.

This patch adds support for these additional states:

- save and restore registers that are used by the compiler upon
  interrupt entry and exit.
- context switch additional registers unbound to any coprocessor
- 'lazy' context switch of registers bound to a coprocessor
- ptrace interface to provide access to additional registers
- update configuration files in include/asm-xtensa/variant-fsf

Signed-off-by: Chris Zankel

[XTENSA] Remove oldmask from sigcontext and fix register flush

2008-02-14T01:12:15+00:00

Remove oldmask from the sigcontext structure. Also update wmask
and windowstart when we flush the AR registers to stack.

Signed-off-by: Chris Zankel

[XTENSA] Remove non-rt signal handling

2007-06-01T00:49:32+00:00

The non-rt signal handling was never really used, so we don't break
anything. This patch also cleans up the signal stack-frame to make
it independent from the processor configuration. It also improves
the method used for controlling single-stepping. We now save and
restore the 'icountlevel' register that controls single stepping
and set or clear the saved state to enable or disable it.

Signed-off-by: Chris Zankel

header cleaning: don't include smp_lock.h when not used

2007-05-08T18:15:07+00:00

Remove includes of  where it is not used/needed.
Suggested by Al Viro.

Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc,
sparc64, and arm (all 59 defconfigs).

Signed-off-by: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds