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Fangrui Song 88f2fe5cad Raland D87318 [LLD][PowerPC] Add support for R_PPC64_GOT_TLSGD_PCREL34 used in TLS General Dynamic 
Add Thread Local Storage support for the 34 bit relocation R_PPC64_GOT_TLSGD_PCREL34 used in General Dynamic.

The compiler will produce code that looks like:
```
pla r3, x@got@tlsgd@pcrel            R_PPC64_GOT_TLSGD_PCREL34
bl __tls_get_addr@notoc(x@tlsgd)     R_PPC64_TLSGD
                                     R_PPC64_REL24_NOTOC
```
LLD should be able to correctly compute the relocation for  R_PPC64_GOT_TLSGD_PCREL34 as well as do the following two relaxations where possible:
General Dynamic to Local Exec:
```
paddi r3, r13, x@tprel
nop
```
and General Dynamic to Initial Exec:
```
pld r3, x@got@tprel@pcrel
add r3, r3, r13
```
Note:
This patch adds support for the PC Relative (no TOC) version of General Dynamic on top of the existing support for the TOC version of General Dynamic.
The ABI does not provide any way to tell by looking only at the relocation `R_PPC64_TLSGD` when it is being used in a TOC instruction sequence or and when it is being used in a no TOC sequence. The TOC sequence should always be 4 byte aligned. This patch adds one to the offset of the relocation when it is being used in a no TOC sequence. In this way LLD can tell by looking at the alignment of the offset of `R_PPC64_TLSGD` whether or not it is being used as part of a TOC or no TOC sequence.

Reviewed By: NeHuang, sfertile, MaskRay

Differential Revision: https://reviews.llvm.org/D87318
 		2020-10-01 12:36:33 -07:00
..
COFF [PDB] Use one func id DenseMap instead of per-source maps, NFC 2020-10-01 12:22:27 -07:00
Common [LLD][COFF] Cover usage of LLD-as-a-library in tests 2020-09-24 15:07:50 -04:00
ELF Raland D87318 [LLD][PowerPC] Add support for R_PPC64_GOT_TLSGD_PCREL34 used in TLS General Dynamic 2020-10-01 12:36:33 -07:00
MachO Internalize functions from various tools. NFC 2020-09-26 15:57:13 -07:00
MinGW [LLD] [MinGW] Enable dynamicbase by default 2020-08-27 15:08:53 +03:00
cmake/modules lld: Let find_package(LLD) work 2020-05-14 09:59:53 -04:00
docs [lld][WebAssembly] Allow exporting of mutable globals 2020-09-30 17:53:27 -07:00
include/lld Re-land "[PDB] Merge types in parallel when using ghashing" 2020-09-30 15:44:38 -07:00
lib [LLD][COFF] Cover usage of LLD-as-a-library in tests 2020-09-24 15:07:50 -04:00
test Raland D87318 [LLD][PowerPC] Add support for R_PPC64_GOT_TLSGD_PCREL34 used in TLS General Dynamic 2020-10-01 12:36:33 -07:00
tools/lld [LLD][COFF] Cover usage of LLD-as-a-library in tests 2020-09-24 15:07:50 -04:00
unittests Use INTERFACE_COMPILE_OPTIONS to disable -Wsuggest-override for any target that links to gtest 2020-07-27 08:37:01 -07:00
utils Python 2/3 compatibility 2019-03-20 07:42:13 +00:00
wasm [WebAssembly] New-style command support 2020-09-30 19:02:40 -07:00
.clang-format
…
.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
…
CMakeLists.txt [LLD] Allow configuring default ld.lld backend 2020-09-15 08:50:02 +03:00
CODE_OWNERS.TXT Add code owners of new MachO port 2020-09-02 19:32:12 -07:00
LICENSE.TXT
…
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.