Re: [PATCH] m68k: Implement _THIS_IP_ using inline asm

[David Laight]

On Thu, 21 May 2026 17:14:33 +0200
Andreas Schwab <schwab@xxxxxxxxxxxxxx> wrote:

> On Mai 21 2026, Marco Elver wrote:
> 
> > version. Additionally, avoiding taking the address of a label prevents
> > compilers from emitting spurious indirect branch targets (e.g. ENDBR or
> > BTI) under control-flow integrity schemes.  
> 
> Ignoring the fact that m68k will never gain such a feature, dot is still
> a label.

But it wont be one the compiler sees.

I think it is an assembler variable that is automatically updated,
so not actually a label that ends up in the symbol table.
Even the '1b:' in some of the other examples are only second class
labels.

-- David

>  If you want to avoid a label, you need to use %pc(0) (or
> %pc(-2) for an address at insn boundary).
>