[all-commits] [llvm/llvm-project] 02eab5: [ELF][AArch64] Fix unneeded thunk for branches to ...
Fangrui Song via All-commits
all-commits at lists.llvm.org
Thu Apr 14 11:32:42 PDT 2022
Author: Fangrui Song <i at maskray.me>
Date: 2022-04-14 (Thu, 14 Apr 2022)
[ELF][AArch64] Fix unneeded thunk for branches to hidden undefined weak
Similar to D119787 for PPC64.
A hidden undefined weak may change its binding to local before some
`isUndefinedWeak` code, so some `isUndefinedWeak` code needs to be changed to
`isUndefined`. The undefined non-weak case has been errored, so just using
`isUndefined` is fine.
The Linux kernel recently has a usage that a branch from 0xffff800008491ee0
references a hidden undefined weak symbol `vfio_group_set_kvm`.
It relies on the behavior that a branch to undefined weak resolving to the next
instruction, otherwise it'd see spurious relocation out of range errors.
Differential Revision: https://reviews.llvm.org/D123750
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