[IA64] Extend notify_die() hooks for IA64

notify_die() added for MCA_{MONARCH,SLAVE,RENDEZVOUS}_{ENTER,PROCESS,LEAVE} and
INIT_{MONARCH,SLAVE}_{ENTER,PROCESS,LEAVE}.  We need multiple
notification points for these events because they can take many seconds
to run which has nasty effects on the behaviour of the rest of the
system.

DIE_SS replaced by a generic DIE_FAULT which checks the vector number,
to allow interception of faults other than SS.

DIE_MACHINE_{HALT,RESTART} added to allow last minute close down
processing, especially when the halt/restart routines are called from
error handlers.

DIE_OOPS added.

The check for kprobe's break numbers has been moved from traps.c to
kprobes.c, allowing DIE_BREAK to be used for any additional break
numbers, i.e. it is no longer kprobes specific.

Hooks for kernel debuggers and kernel dumpers added, ENTER and LEAVE.
Both of these disable the system for long periods which impact on
watchdogs and heartbeat systems in general.  More patches to come that
use these events to reset watchdogs and heartbeats.

unregister_die_notifier() added and both routines exported.  Requested
by Dean Nelson.

Lock removed from {un,}register_die_notifier.  notifier_chain_register()
already takes a lock.  Also the generic notifier chain locking is being
reworked to distinguish between callbacks that can block and those that
cannot, the lock in {un,}register_die_notifier would interfere with
that change.  http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2

Leading white space removed from arch/ia64/kernel/kprobes.c.

Typo in mca.c in original version of this patch found & fixed by Dean
Nelson.

Signed-off-by: Keith Owens <kaos@sgi.com>
Acked-by: Dean Nelson <dcn@sgi.com>
Acked-by: Anil Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 13 insertions, 9 deletions

diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 96736a1..801eeae 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -347,7 +347,7 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
 		((struct fnptr *)kretprobe_trampoline)->ip;
 
 	spin_lock_irqsave(&kretprobe_lock, flags);
-        head = kretprobe_inst_table_head(current);
+	head = kretprobe_inst_table_head(current);
 
 	/*
 	 * It is possible to have multiple instances associated with a given
@@ -363,9 +363,9 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
 	 *       kretprobe_trampoline
 	 */
 	hlist_for_each_entry_safe(ri, node, tmp, head, hlist) {
-                if (ri->task != current)
+		if (ri->task != current)
 			/* another task is sharing our hash bucket */
-                        continue;
+			continue;
 
 		if (ri->rp && ri->rp->handler)
 			ri->rp->handler(ri, regs);
@@ -394,7 +394,7 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
 	 * kprobe_handler() that we don't want the post_handler
 	 * to run (and have re-enabled preemption)
 	 */
-        return 1;
+	return 1;
 }
 
 /* Called with kretprobe_lock held */
@@ -739,12 +739,16 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
 
 	switch(val) {
 	case DIE_BREAK:
-		if (pre_kprobes_handler(args))
-			ret = NOTIFY_STOP;
+		/* err is break number from ia64_bad_break() */
+		if (args->err == 0x80200 || args->err == 0x80300)
+			if (pre_kprobes_handler(args))
+				ret = NOTIFY_STOP;
 		break;
-	case DIE_SS:
-		if (post_kprobes_handler(args->regs))
-			ret = NOTIFY_STOP;
+	case DIE_FAULT:
+		/* err is vector number from ia64_fault() */
+		if (args->err == 36)
+			if (post_kprobes_handler(args->regs))
+				ret = NOTIFY_STOP;
 		break;
 	case DIE_PAGE_FAULT:
 		/* kprobe_running() needs smp_processor_id() */