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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114848] loongarch: epilogue in _Unwind_RaiseException
 corrupts return value due to __builtin_eh_return
Date: Tue, 30 Apr 2024 01:09:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114848

--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by LuluCheng
<chenglulu@gcc.gnu.org>:

https://gcc.gnu.org/g:bb78099d2624b52c781ed6e5d85e43d54c3cda1a

commit r12-10403-gbb78099d2624b52c781ed6e5d85e43d54c3cda1a
Author: Yang Yujie <yangyujie@loongson.cn>
Date:   Fri Dec 8 18:01:18 2023 +0800

    LoongArch: Fix eh_return epilogue for normal returns.

    On LoongArch, the regitsters $r4 - $r7 (EH_RETURN_DATA_REGNO) will be s=
aved
    and restored in the function prologue and epilogue if the given function
calls
    __builtin_eh_return.  This causes the return value to be overwritten on
normal
    return paths and breaks a rare case of libgcc's _Unwind_RaiseException.

    gcc/ChangeLog:

            PR target/114848
            * config/loongarch/loongarch.cc: Do not restore the saved eh_re=
turn
            data registers ($r4-$r7) for a normal return of a function that
calls
            __builtin_eh_return elsewhere.
            * config/loongarch/loongarch-protos.h: Same.
            * config/loongarch/loongarch.md: Same.

    gcc/testsuite/ChangeLog:

            * gcc.target/loongarch/eh_return-normal-return.c: New test.

    (cherry picked from commit 4b421728289e6f1caa0dfaa953a11698ab95d37d)=