| commit | 8323655a21554fc2b890efded22dddfacd0a1d9e | [log] [tgz] |
|---|---|---|
| author | Peter Smith <peter.smith@linaro.org> | Mon Dec 17 10:33:47 2018 +0000 |
| committer | Peter Smith <peter.smith@linaro.org> | Mon Dec 17 10:33:47 2018 +0000 |
| tree | a4020e8df4137a2de5e338852faaeb95811fce25 | |
| parent | 3e4aa4e8671523321af51449e0569f455ef3ad43 [diff] |
[ELF][ARM] Add support for architecture v6m thunks ARM Architecture v6m is used by the smallest microcontrollers such as the cortex-m0. It is Thumb only (no Thumb 2) which prevents it from using the existing Thumb 2 range extension thunks as these use the Thumb 2 movt/movw instructions. Range extension thunks are not usually needed for microcontrollers due to the small amount of flash and ram on the device, however if code is copied from flash into ram then a range extension thunk is required to call that code. This change adds support for v6m range extension thunks. The procedure call standard APCS permits a thunk to corrupt the intra-procedural scratch register r12 (referred to as ip in the APCS). Most Thumb instructions do not permit access to high registers (r8 - r15) so the thunks must spill some low registers (r0 - r7) to perform the control transfer. Fixes pr39922 Differential Revision: https://reviews.llvm.org/D55555 git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@349337 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.