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authorJean-Philippe Brucker <jean-philippe@linaro.org>2020-11-03 14:49:01 +0100
committerWill Deacon <will@kernel.org>2020-11-03 14:03:38 +0000
commit7ee31a3aa8f490c6507bc4294df6b70bed1c593e (patch)
tree901c9487d9137d2c88dcdb5f0e9100f323fc9e53 /.get_maintainer.ignore
parent2a13c13b39a8aea4c69a31549e4cb0094f30103b (diff)
arm64: kprobes: Use BRK instead of single-step when executing instructions out-of-line
Commit 36dadef23fcc ("kprobes: Init kprobes in early_initcall") enabled using kprobes from early_initcall. Unfortunately at this point the hardware debug infrastructure is not operational. The OS lock may still be locked, and the hardware watchpoints may have unknown values when kprobe enables debug monitors to single-step instructions. Rather than using hardware single-step, append a BRK instruction after the instruction to be executed out-of-line. Fixes: 36dadef23fcc ("kprobes: Init kprobes in early_initcall") Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Link: https://lore.kernel.org/r/20201103134900.337243-1-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
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