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[IA64] Remove getting break_num by decoding instruction

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break.b always sets cr.iim to 0 and the current code tries to
get the break_num by decoding instruction. However, their
seems to be a race condition while reading the regs->cr_iip,
as on other cpu the break.b at regs->cr_iip might have been
replaced with the original instruction as a result of
unregister_kprobe() and hence decoding instruction to
obtain break_num will result in wrong value in this case.

Also includes changes to kprobes.c which now has to handle
break number zero.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Keshavamurthy Anil S
2005-11-22 14:15:49 -08:00
committed by Tony Luck
parent b77dae5293
commit 5a94bcfd2a
2 changed files with 1 additions and 19 deletions
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2
arch/ia64/kernel/kprobes.c
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@@ -740,7 +740,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
switch(val) {
case DIE_BREAK:
/* err is break number from ia64_bad_break() */
if (args->err == 0x80200 || args->err == 0x80300)
if (args->err == 0x80200 || args->err == 0x80300 || args->err == 0)
if (pre_kprobes_handler(args))
ret = NOTIFY_STOP;
break;