Re: [PATCH 7/7] DWARF: add the config option

[Andy Lutomirski]

On Sat, May 20, 2017 at 1:01 PM, H.J. Lu <hjl.tools@xxxxxxxxx> wrote:
> On Sat, May 20, 2017 at 9:20 AM, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
>
>>>
>>> (H.J., could we get a binutils feature that allows is to do:
>>>
>>> pushq %whatever
>>> .cfi_adjust_sp -8
>>> ...
>>> popq %whatever
>>> .cfi_adjust_sp 8
>>>
>
> Np.  Compiler needs to generate this.
>

How would the compiler generate this when inline asm is involved?  For
the kernel, objtool could get around the need to have these
annotations, but not so much for user code?  Is the compiler supposed
to parse the inline asm?  Would the compiler provide some magic % code
to represent the current CFA base register?