Re: [PATCH v4 2/5] LoongArch: Use la.pcrel instead of la.abs for exception handlers

[Youling Tang]

On 02/16/2023 03:10 PM, Xi Ruoyao wrote:
> On Thu, 2023-02-16 at 14:59 +0800, Jinyang He wrote:
> > +.macro la.abs reg, sym
> > +766:
> > +    nop
> > +    nop
> > +    nop
> > +    nop
>
> In the "formal" version we can code
>
> lu12i.w		reg, 0
> ori		reg, reg, 0
> lu32i.d		reg, 0
> lu52i.d		reg, reg, 0
>
> here.  Then we only need to fixup the immediate slot so we can avoid
> using parse_r.
>
>
> > +    .pushsection ".laabs", "aw", %progbits
> > +768:
> > +    .word 768b-766b
> > +    parse_r regno, \reg
> > +    .word regno
> > +    .dword \sym
> > +    .popsection
> > +.endm

I will try to modify a version for testing, using the following
definition, when the RELOCATABLE is turned on, the "la.abs macro" is
used, otherwise the "la.abs pseudo instruction" is still used as before.

#ifdef CONFIG_RELOCATABLE
.macro la.abs reg, sym
lu12i.w		reg, 0
ori		reg, reg, 0
lu32i.d		reg, 0
lu52i.d		reg, reg, 0
.endm
#endif

Youling.