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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgcc/108727] gcc.dg/split-5.c fails on power 9 BE
Date: Wed, 08 Mar 2023 07:00:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108727

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:

https://gcc.gnu.org/g:15b83b69ca99d97643075776ba94f2dd1f05b46e

commit r13-6545-g15b83b69ca99d97643075776ba94f2dd1f05b46e
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Wed Mar 8 00:57:21 2023 -0600

    libgcc, rs6000: Fix bump size for powerpc64 elfv1 ABI [PR108727]

    As PR108727 shows, when cleanup code called by the stack
    unwinder calls function _Unwind_Resume, it goes via plt
    stub like:

       function 00000000.plt_call._Unwind_Resume:

    =3D> 0x0000000010003580 <+0>:     std     r2,40(r1)
       0x0000000010003584 <+4>:     ld      r12,-31760(r2)
       0x0000000010003588 <+8>:     mtctr   r12
       0x000000001000358c <+12>:    ld      r2,-31752(r2)
       0x0000000010003590 <+16>:    cmpldi  r2,0
       0x0000000010003594 <+20>:    bnectr+
       0x0000000010003598 <+24>:    b       0x100031a4
                                            <_Unwind_Resume@plt>

    It wants to save TOC base (r2) to r1 + 40, but we only
    bump the stack segment by 32 bytes as follows:

       stdu %r29,-32(%r3)

    It means the access is out of the stack segment allocated
    by __generic_morestack, once the touch area isn't writable
    like this failure shows, it would cause segment fault.

    So fix the bump size with one reasonable value PARAMS.

            PR libgcc/108727

    libgcc/ChangeLog:

            * config/rs6000/morestack.S (__morestack): Use PARAMS for new s=
tack
            bump size.=