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author | Maneesh Soni <manesoni@cisco.com> | 2011-11-08 11:38:26 (GMT) |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2011-12-07 22:04:03 (GMT) |
commit | 6457a396bbc20656009eaf950ca165912a943520 (patch) | |
tree | 5a940616d2b1b55f182d4022a39c4d37a9cda1e7 /arch/mips/pci | |
parent | d8d4e3ae0b5c179c0bfd3f0af5b352d13bea9cfa (diff) | |
download | linux-6457a396bbc20656009eaf950ca165912a943520.tar.xz |
MIPS Kprobes: Support branch instructions probing
This patch provides support for kprobes on branch instructions. The branch
instruction at the probed address is actually emulated and not executed
out-of-line like other normal instructions. Instead the delay-slot instruction
is copied and single stepped out of line.
At the time of probe hit, the original branch instruction is evaluated
and the target cp0_epc is computed similar to compute_retrun_epc(). It
is also checked if the delay slot instruction can be skipped, which is
true if there is a NOP in delay slot or branch is taken in case of
branch likely instructions. Once the delay slot instruction is single
stepped the normal execution resume with the cp0_epc updated the earlier
computed cp0_epc as per the branch instructions.
Signed-off-by: Maneesh Soni <manesoni@cisco.com>
Signed-off-by: Victor Kamensky <kamensky@cisco.com>
Cc: David Daney <david.daney@cavium.com>
Cc: ananth@in.ibm.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2914/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pci')
0 files changed, 0 insertions, 0 deletions