Subject: Re: [PATCH v2 16/16] objtool/powerpc: Add --mcount specific implementation

From: Segher Boessenkool <[email-masked]>
Date: Mon, 5 Sep 2022 15:43:00 -0500

Hi!

On Mon, Sep 05, 2022 at 04:15:07PM +0530, Naveen N. Rao wrote:
> Segher Boessenkool wrote:
> >>> +		if ((insn & 3) == 1) {
> >>> +			*type = INSN_CALL;
> >>> +			*immediate = insn & 0x3fffffc;
> >>> +			if (*immediate & 0x2000000)
> >>> +				*immediate -= 0x4000000;
> >>> +		}
> >>> +		break;
> >>> +	}
> >
> >Does this handle AA=1 correctly at all?  That is valid both with and
> >without relocations, just like AA=0.  Same for AA=1 LK=0 btw.
> >
> >If you only handle AA=0, the code should explicitly test for that.
> 
> The code does test for AA=0 LK=1 with the if statement there?

Yes, but that is not what I said :-)

It may be fine to not *handle* AA=1 at all, but the code should at least
scream bloody murder when it encounters it anyway :-)

Segher