linux-toradex.git/arch/microblaze/kernel/entry-nommu.S, branch v4.19 Linux kernel for Apalis and Colibri modules microblaze: fix handling of multiple pending signals 2013-02-03T23:16:02+00:00 Al Viro viro@zeniv.linux.org.uk 2012-04-29T08:43:50+00:00 e9f9252667e383c0ccfd3570b358ccb72cd51359 We need to keep building sigframes until no pending signals remain. Wrap do_notify_resume() calls into loops; do _not_ allow syscall restart logics to trigger after the first iteration. Incidentally, comments about pending signals that should (somehow) be in r18 are pure BS. Doesn't work that way and cannot work that way, sorry... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
We need to keep building sigframes until no pending signals remain.
Wrap do_notify_resume() calls into loops; do _not_ allow syscall
restart logics to trigger after the first iteration.

Incidentally, comments about pending signals that should (somehow)
be in r18 are pure BS.  Doesn't work that way and cannot work that
way, sorry...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
microblaze: fix the horror with restarts of sigreturn() 2013-02-03T23:16:02+00:00 Al Viro viro@zeniv.linux.org.uk 2012-04-29T08:11:34+00:00 14203e19cbc562a79f49117c45c80639a1e65bdd solution a-la arm one - pick a callee-saved register (r30), set it non-zero when entering a syscall, have sigreturn wrapper zero it out and pass the value in it to do_notify_resume() as "in_syscall" (actually, "restarts allowed") argument. Note that we don't give a damn about ret_from_fork() - return value is not restart-worthy anyway. Possible remaining bug: on !MMU we still have _debug_exception() restartable. If it hits with -ERESTART_... accidentally in r3, fun happens. MMU does _not_ have _debug_exception() restartable. If that's decided to be a bug (as I strongly suspect it to be), we'll just need to replace setting r30 to 1 with setting r30 to 0 in !MMU _debug_exception(). Up to microblaze maintainers... [folded a fix from Michal] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
solution a-la arm one - pick a callee-saved register (r30), set it
non-zero when entering a syscall, have sigreturn wrapper zero it out
and pass the value in it to do_notify_resume() as "in_syscall" (actually,
"restarts allowed") argument.

Note that we don't give a damn about ret_from_fork() - return value
is not restart-worthy anyway.

Possible remaining bug: on !MMU we still have _debug_exception()
restartable.  If it hits with -ERESTART_... accidentally in r3, fun happens.
MMU does _not_ have _debug_exception() restartable.  If that's decided to
be a bug (as I strongly suspect it to be), we'll just need to replace
setting r30 to 1 with setting r30 to 0 in !MMU _debug_exception().
Up to microblaze maintainers...

[folded a fix from Michal]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
microblaze: evict the check for kernel_mode(regs) from do_notify_resume() 2013-02-03T23:16:01+00:00 Al Viro viro@zeniv.linux.org.uk 2012-04-29T07:35:29+00:00 c886a9fc1f69c0e53788a9c4a780b6b8825bd4ab Only one caller hasn't done it in assembler - work_pending on !MMU. Everything else can't reach do_notify_resume() if we are returning to kernel mode, so move that check to that sole caller and make do_notify_resume() reachable only when returning to userland. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Only one caller hasn't done it in assembler - work_pending on !MMU.
Everything else can't reach do_notify_resume() if we are returning
to kernel mode, so move that check to that sole caller and make
do_notify_resume() reachable only when returning to userland.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
microblaze: Remove passing the second arg to schedule_tail 2012-12-13T13:38:56+00:00 Michal Simek monstr@monstr.eu 2012-10-09T06:58:19+00:00 1475b0f4b4334564470a8606086a42954aa06ba9 Signed-off-by: Michal Simek <monstr@monstr.eu> 
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: switch to generic fork/vfork/clone 2012-11-29T03:43:40+00:00 Al Viro viro@zeniv.linux.org.uk 2012-10-27T04:03:41+00:00 f3268edbe6fe0ce56e62c6d6b14640aeb04864b7 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
microblaze: switch to generic sys_execve() 2012-11-16T07:45:55+00:00 Al Viro viro@zeniv.linux.org.uk 2012-10-10T17:11:01+00:00 5f6c4ab6ee781c9aace7c8548ad9bd87f5678df7 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
microblaze: switch to generic kernel_execve() 2012-11-16T07:45:47+00:00 Al Viro viro@zeniv.linux.org.uk 2012-10-10T15:52:44+00:00 99c59f60fd751876c37fbea01e55606441ac6db4 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
microblaze: switch to generic kernel_thread() 2012-11-16T07:44:57+00:00 Al Viro viro@zeniv.linux.org.uk 2012-10-06T17:52:37+00:00 2319295dd8dbd076afa136bffb797ef726b605a0 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
microblaze: drop 'oldset' argument of do_notify_resume() 2012-05-22T03:59:48+00:00 Al Viro viro@zeniv.linux.org.uk 2012-04-24T06:21:18+00:00 8314019141e4f7274ea4dc264a47bbb2e17c66dd never used... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
never used...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
microblaze: handle TIF_NOTIFY_RESUME 2012-05-22T03:59:47+00:00 Al Viro viro@zeniv.linux.org.uk 2012-04-24T06:03:06+00:00 969a96168091f837645a674a9f7ed1a9aaa1424b Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>