[Valgrind-users] Information on adding unknown instructions due to "illegal opcde"?

[Jeffrey W. <nol...@gm...>]

Hi Everyone,

We use Valgrind as part of our release process. Its a security gate,
and the program must pass through it for release.

We recently ramped up testing on ARM and ARM64. We caught an illegal
opcode on both platforms. The illegal opcode related to a rotate,
which kind of surprised us. We have experienced it on occasion on
other platforms to, like x86_64 when GCC enlists SSE 4.2. Rather than
just filing the bug report, we would like to attempt to provide
support for the instruction. If the additional support is successful,
we would like to offer it back to the community.

We are having trouble locating information how to add instruction
support to Valgrind. For example, the following is not producing
useful results:
http://www.google.com/search?q="illegal+opcode"+site:valgrind.org .

Is there any information on adding support for unsupported instructions?

Thanks in advance.