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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99888] Add powerpc ELFv2 support for
 -fpatchable-function-entry*
Date: Wed, 03 Aug 2022 09:50:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99888

--- Comment #2 from Kewen Lin <linkw at gcc dot gnu.org> ---
Created attachment 53405
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53405&action=3Dedit
untested patch

With the attached patch, for -fpatchable-function-entry=3D5,2 it gets:

foo:
.LFB0:
        .cfi_startproc
.LCF0:
0:      addis 2,12,.TOC.-.LCF0@ha
        addi 2,2,.TOC.-.LCF0@l
        .section        __patchable_function_entries,"awo",@progbits,foo
        .align 3
        .8byte  .LPFE1
        .section        ".text"
.LPFE1:
        nop
        nop
        .localentry     foo,.-foo
        .section        __patchable_function_entries,"awo",@progbits,foo
        .align 3
        .8byte  .LPFE2
        .section        ".text"
.LPFE2:
        nop
        nop
        nop
        std 31,-8(1)

for -fpatchable-function-entry=3D5,1, it emits error msg:

test.c:4:1: error: =E2=80=98-fpatchable-function-entry=3DM,N=E2=80=99 N NOP=
s can cause assembler
error due to invalid .localentry expression.=