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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98482] -mfentry creates invalid call for -mcmodel=large
Date: Fri, 08 Jan 2021 09:29:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98482

--- Comment #9 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Topi Miettinen from comment #8)
> I'm unfortunately ignorant to GCC internals and usage of %r10, but otherw=
ise
> the patch looks good to me.
>=20
> For -mcmodel=3Dlarge -fPIC, the call sequence probably needs to be simila=
r to
> how other extern functions are called under those flags:
>=20
> .L2:
>         movabsq $_GLOBAL_OFFSET_TABLE_-.L2, %reg0
>         leaq    .L2(%rip), %reg1
>         movabsq $__fentry__@PLTOFF, %reg2
>         addq    %reg0, %reg1
>         addq    %reg1, %reg2
>         call    *%reg2

We are only lucky to get one temporary register (%r10), so perhaps the above
could be implemented for NO_PROFILE_COUNTERS targets, where %r11 is also
available.=