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author | Mark Rutland | 2017-01-27 17:15:38 +0100 |
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committer | Will Deacon | 2017-01-27 18:13:14 +0100 |
commit | 49f6cba617fef4bc097a291e0dfd028cc7073c52 (patch) | |
tree | d45460e73e98a004d0bb9ddb3cadfabaa8f9d624 /Documentation/arm/CCN.txt | |
parent | arm64: Use __tlbi() macros in KVM code (diff) | |
download | kernel-qcow2-linux-49f6cba617fef4bc097a291e0dfd028cc7073c52.tar.gz kernel-qcow2-linux-49f6cba617fef4bc097a291e0dfd028cc7073c52.tar.xz kernel-qcow2-linux-49f6cba617fef4bc097a291e0dfd028cc7073c52.zip |
arm64: handle sys and undef traps consistently
If an EL0 instruction in the SYS class triggers an exception, do_sysintr
looks for a sys64_hook matching the instruction, and if none is found,
injects a SIGILL. This mirrors what we do for undefined instruction
encodings in do_undefinstr, where we look for an undef_hook matching the
instruction, and if none is found, inject a SIGILL.
Over time, new SYS instruction encodings may be allocated. Prior to
allocation, exceptions resulting from these would be handled by
do_undefinstr, whereas after allocation these may be handled by
do_sysintr.
To ensure that we have consistent behaviour if and when this happens, it
would be beneficial to have do_sysinstr fall back to do_undefinstr.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Suzuki Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'Documentation/arm/CCN.txt')
0 files changed, 0 insertions, 0 deletions