ARM: hw_breakpoint: disallow per-cpu breakpoints without overflow handler

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Single-stepping a breakpoint requires us to disable it temporarily so that
we don't get stuck in a recursive debug trap. With per-cpu breakpoints this
presents a problem where an interrupt can be taken before the single-step has
completed and a new task is eventually scheduled. This new task will not
hit the breakpoint because it will have been disabled during the previous
handling code.

This patch disallows per-cpu breakpoints on ARM when an overflow handler
is not present. A similar effect can be created by placing breakpoints on
a shell and then running applications there.

Signed-off-by: Will Deacon <will.deacon@arm.com>

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This commit is contained in:

Will Deacon 2010-12-01 17:05:24 +00:00

parent 9ebb3cbcc3

commit 3ce70b2e24

1 changed files with 4 additions and 2 deletions

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arch/arm/kernel/hw_breakpoint.c

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