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| author | Will Deacon <will.deacon@arm.com> | 2010-12-01 17:05:24 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2010-12-06 11:55:57 +0000 |
| commit | 3ce70b2e24cd35cc9f2df8cf5205b8ab4e6178e1 (patch) | |
| tree | 2f0939d5d8f2ac9d97932905f0b147b5a5e1891e /arch/arm/kernel/ptrace.c | |
| parent | 9ebb3cbcc39d4e61ae6751167086acfb5c201e6f (diff) | |
| download | op-kernel-dev-3ce70b2e24cd35cc9f2df8cf5205b8ab4e6178e1.zip op-kernel-dev-3ce70b2e24cd35cc9f2df8cf5205b8ab4e6178e1.tar.gz | |
ARM: hw_breakpoint: disallow per-cpu breakpoints without overflow handler
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>
Diffstat (limited to 'arch/arm/kernel/ptrace.c')
0 files changed, 0 insertions, 0 deletions
