llvm-project/lld
Fangrui Song 4dc2fb123d [ELF] Error if -Ttext-segment is specified
In GNU ld, -Ttext sets the address of the .text section and -Ttext-segment sets the address of the text segment (RX).

gold only supports the -Ttext-segment semantic and treats -Ttext as an alias for -Ttext-segment.

lld only supports the -Ttext semantic and treats -Ttext-segment as an
alias for -Ttext.  The text segment will be assigned to an address less
than the specified -Ttext-segment value.

This patch drops the -Ttext-segment alias.

The text segment is traditionally the first segment. Users who specify
-Ttext-segment may actually want to specify --image-base, the lld way to
express this. Unfortunately currently this is supported by GNU ld's
COFF port but not by its ELF port. gold does not support this option.
With -z separate-code, the behavior of GNU ld -Ttext-segment is weird (see https://sourceware.org/bugzilla/show_bug.cgi?id=25207)

rL289827 introduced the alias for linking qemu's non-pie user mode
binaries. As explained previously, this actually assigns the text
segment to an address less than 0x60000000. I feel that a better fix is
on the qemu side:
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02480.html

Reviewed By: grimar, ruiu

Differential Revision: https://reviews.llvm.org/D70468
2019-11-21 09:41:55 -08:00
..
COFF LLD: Don't use the stderrOS stream in link before it's reassigned. 2019-11-21 10:55:03 -05:00
Common LLD: Don't use the stderrOS stream in link before it's reassigned. 2019-11-21 10:55:03 -05:00
ELF [ELF] Error if -Ttext-segment is specified 2019-11-21 09:41:55 -08:00
MinGW LLD: Don't use the stderrOS stream in link before it's reassigned. 2019-11-21 10:55:03 -05:00
cmake/modules [CMake] Properly conditionalize installation of lld libraries 2018-03-09 13:09:36 +00:00
docs [lld] [ELF] Add '-z nognustack' opt to suppress emitting PT_GNU_STACK 2019-10-29 17:54:23 +01:00
include/lld LLD: Don't use the stderrOS stream in link before it's reassigned. 2019-11-21 10:55:03 -05:00
lib LLD: Don't use the stderrOS stream in link before it's reassigned. 2019-11-21 10:55:03 -05:00
test [ELF] Error if -Ttext-segment is specified 2019-11-21 09:41:55 -08:00
tools/lld Make it possible to redirect not only errs() but also outs() 2019-11-18 11:18:06 +09:00
unittests Make it possible to redirect not only errs() but also outs() 2019-11-18 11:18:06 +09:00
utils Python 2/3 compatibility 2019-03-20 07:42:13 +00:00
wasm LLD: Don't use the stderrOS stream in link before it's reassigned. 2019-11-21 10:55:03 -05:00
.arcconfig
.clang-format
.gitignore
CMakeLists.txt [CMake] Don't set Python_ADDITIONAL_VERSIONS 2019-07-18 15:17:42 +00:00
CODE_OWNERS.TXT
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
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.