llvm-project/lld
Fangrui Song 02eab52866 [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.

Fixes https://github.com/ClangBuiltLinux/linux/issues/1624

Differential Revision: https://reviews.llvm.org/D123750
2022-04-14 11:32:30 -07:00
..
COFF [NFC] Simplify /noimplib argument logic 2022-04-13 16:40:30 +02:00
Common Cleanup codegen includes 2022-03-16 08:43:00 +01:00
ELF [ELF][AArch64] Fix unneeded thunk for branches to hidden undefined weak 2022-04-14 11:32:30 -07:00
MachO [lld-macho][nfc] De-templatize UnwindInfoSection 2022-04-13 16:19:22 -04:00
MinGW [LLD][MinGW] Add --heap argument support 2022-01-30 00:01:45 +02:00
cmake/modules [CMake] Factor out config prefix finding logic 2022-01-07 20:16:18 +00:00
docs [ELF] Default to --no-fortran-common 2022-03-30 09:12:09 -07:00
include/lld [lld] Make error handling functions opaque 2022-02-17 11:54:57 -08:00
test [ELF][AArch64] Fix unneeded thunk for branches to hidden undefined weak 2022-04-14 11:32:30 -07:00
tools/lld [LLD] Fix issue in HIP due to unspecified order of evaluation of the function object 2022-02-08 19:12:15 -05:00
utils
wasm [lld] Remove support for legacy pass manager 2022-04-07 10:17:31 +02:00
.clang-format
.clang-tidy NFC: .clang-tidy: Inherit configs from parents to improve maintainability 2021-06-08 08:25:59 -07:00
.gitignore
CMakeLists.txt [lld] Require C++14 in LLD standalone build 2022-02-22 18:15:29 -05:00
CODE_OWNERS.TXT Add code owners of new MachO port 2020-09-02 19:32:12 -07:00
LICENSE.TXT
README.md [doc] Place sha256 in lld/README.md into backticks 2021-01-12 10:19:40 -08:00

README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.

Benchmarking

In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.

It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz

The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.