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llvm / lld / ddc6decbbb141038de53e8ce219b0eaf2606c976
commitddc6decbbb141038de53e8ce219b0eaf2606c976[log] [tgz]
authorSean Fertile <sfertile@ca.ibm.com>Wed Jan 23 21:04:03 2019 +0000
committerSean Fertile <sfertile@ca.ibm.com>Wed Jan 23 21:04:03 2019 +0000
tree4dd620f6bfe8c96a8a60047aea51cad98de95a59
parentdd25c096870860a544d7752f0fae98c24e564635 [diff]
[PPC64] Sort .toc sections accessed with small code model relocs close to .got.

Small code model global variable access on PPC64 has a very limited range of
addressing. The instructions the relocations are used on add an offset in the
range [-0x8000, 0x7FFC] to the toc pointer which points to .got +0x8000, giving
an addressable range of [.got, .got + 0xFFFC]. While user code can be recompiled
with medium and large code models when the binary grows too large for small code
model, there are small code model relocations in the crt files and libgcc.a
which are typically shipped with the distros, and the ABI dictates that linkers
must allow linking of relocatable object files using different code models.

To minimze the chance of relocation overflow, any file that contains a small
code model relocation should have its .toc section placed closer to the .got
then any .toc from a file without small code model relocations.

Differential Revision: https://reviews.llvm.org/D56920

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@351978 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed
tree: 4dd620f6bfe8c96a8a60047aea51cad98de95a59
  1. cmake/
  2. COFF/
  3. Common/
  4. docs/
  5. ELF/
  6. include/
  7. lib/
  8. MinGW/
  9. test/
  10. tools/
  11. unittests/
  12. utils/
  13. wasm/
  14. .arcconfig
  15. .clang-format
  16. .gitignore
  17. CMakeLists.txt
  18. CODE_OWNERS.TXT
  19. LICENSE.TXT
  20. README.md
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.