| commit | 45d5724805314a73fc012377d32865107d2a2abd | [log] [tgz] |
|---|---|---|
| author | Sean Fertile <sfertile@ca.ibm.com> | Wed Nov 14 17:56:43 2018 +0000 |
| committer | Sean Fertile <sfertile@ca.ibm.com> | Wed Nov 14 17:56:43 2018 +0000 |
| tree | fe060b79e39c3117ad213ceed2b26977eb7c1d2a | |
| parent | bf9f44747948b86dc9da0da3fa5ea02a4f658e66 [diff] |
[PPC64] Long branch thunks. On PowerPC64, when a function call offset is too large to encode in a call instruction the address is stored in a table in the data segment. A thunk is used to load the branch target address from the table relative to the TOC-pointer and indirectly branch to the callee. When linking position-dependent code the addresses are stored directly in the table, for position-independent code the table is allocated and filled in at load time by the dynamic linker. For position-independent code the branch targets could have gone in the .got.plt but using the .branch_lt section for both position dependent and position independent binaries keeps it consitent and helps keep this PPC64 specific logic seperated from the target-independent code handling the .got.plt. Differential Revision: https://reviews.llvm.org/D53408 git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@346877 91177308-0d34-0410-b5e6-96231b3b80d8
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.
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.