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Fangrui Song 03ffe58605 [ELF][PPC64] Don't perform toc-indirect to toc-relative relaxation for R_PPC64_TOC16_HA not followed by R_PPC64_TOC16_LO_DS 
The current implementation assumes that R_PPC64_TOC16_HA is always followed
by R_PPC64_TOC16_LO_DS. This can break with:

// Load the address of the TOC entry, instead of the value stored at that address
  addis 3, 2, .LC0@tloc@ha  # R_PPC64_TOC16_HA
  addi  3, 3, .LC0@tloc@l   # R_PPC64_TOC16_LO
  blr

which is used by boringssl's util/fipstools/delocate/delocate.go
https://github.com/google/boringssl/blob/master/crypto/fipsmodule/FIPS.md has some documentation.
In short, this tool converts an assembly file to avoid any potential relocations.
The distance to an input .toc is not a constant after linking, so the assembly cannot use an `addis;ld` pair.
Instead, delocate changes the code to jump to a stub (`addis;addi`) which loads the TOC entry address.

Reviewed By: sfertile

Differential Revision: https://reviews.llvm.org/D78431
 		2020-04-28 12:13:27 -07:00
..
COFF [COFF] Add a fastpath for /INCLUDE: in .drective sections 2020-04-28 10:35:57 -07:00
Common [lld][COFF][ELF][WebAssembly] Replace --[no-]threads /threads[:no] with --threads={1,2,...} /threads:{1,2,...} 2020-03-31 08:46:12 -07:00
ELF [ELF][PPC64] Don't perform toc-indirect to toc-relative relaxation for R_PPC64_TOC16_HA not followed by R_PPC64_TOC16_LO_DS 2020-04-28 12:13:27 -07:00
MachO Revert "[lld-macho] Add basic symbol table output" 2020-04-28 11:34:03 -07:00
MinGW Remove unused Endian.h includes, NFC 2020-03-11 15:45:34 -07:00
cmake/modules
…
docs [ELF] Add --warn-backrefs-exclude=<glob> 2020-04-20 07:52:15 -07:00
include/lld Reland D75382 "[lld] Initial commit for new Mach-O backend" 2020-04-02 12:03:43 -07:00
lib fix typo in comment to cycle bots 2020-04-04 12:52:45 -04:00
test [ELF][PPC64] Don't perform toc-indirect to toc-relative relaxation for R_PPC64_TOC16_HA not followed by R_PPC64_TOC16_LO_DS 2020-04-28 12:13:27 -07:00
tools/lld Enable new passmanager plugin support for LTO. 2020-04-14 15:07:07 -07:00
unittests Make llvm::StringRef to std::string conversions explicit. 2020-01-28 23:25:25 +01:00
utils Python 2/3 compatibility 2019-03-20 07:42:13 +00:00
wasm [lld][WebAssembly] Fix crash on function signature mismatch with --relocatable 2020-04-25 10:26:11 -07:00
.clang-format
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.clang-tidy [lld] Add .clang-tidy to customize readability-identifier-naming.{Member,Parameter,Variable}Case => camelBack 2020-03-09 08:26:41 -07:00
.gitignore
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CMakeLists.txt build: use `find_package(Python3)` if available 2020-04-28 09:24:27 -07:00
CODE_OWNERS.TXT
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LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
README.md
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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.