Re: [RFC v4 07/18] objtool: Introduce INSN_UNKNOWN type

From: Josh Poimboeuf
Date: Thu Aug 22 2019 - 16:04:11 EST

On Fri, Aug 16, 2019 at 01:23:52PM +0100, Raphael Gault wrote:
> On arm64 some object files contain data stored in the .text section.
> This data is interpreted by objtool as instruction but can't be
> identified as a valid one. In order to keep analysing those files we
> introduce INSN_UNKNOWN type. The "unknown instruction" warning will thus
> only be raised if such instructions are uncountered while validating an
> execution branch.
> This change doesn't impact the x86 decoding logic since 0 is still used
> as a way to specify an unknown type, raising the "unknown instruction"
> warning during the decoding phase still.
> Signed-off-by: Raphael Gault <raphael.gault@xxxxxxx>

Is there a reason such data can't be moved to .rodata? That would seem
like the proper fix.