maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/lld/test/ELF/relocation-relative-synthet...

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

12 lines
270 B
ArmAsm
Raw Normal View History

ELF: Forbid all relative relocations to absolute symbols in PIC, except for weak undefined. Weak undefined symbols resolve to the image base. This is a little strange, but it allows us to link function calls to such symbols. Normally such a call will be guarded with a comparison, which will load a zero from the GOT. There's one example of such a function call in crti.o in Linux's CRT. As part of this change, I also needed to make the synthetic start and end symbols image base relative in the case where their sections were empty, so that PC-relative references to those symbols would continue to work. Differential Revision: http://reviews.llvm.org/D19844 llvm-svn: 268350
2016-05-03 09:21:08 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
# RUN: ld.lld %t.o -o %t -pie
[test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC Also change some options that have different semantics (cause confusion) in llvm-readelf mode: -s => -S -t => --symbols -sd => --section-data llvm-svn: 359651
2019-05-01 13:49:01 +08:00
# RUN: llvm-readobj --dyn-relocations %t | FileCheck %s
ELF: Forbid all relative relocations to absolute symbols in PIC, except for weak undefined. Weak undefined symbols resolve to the image base. This is a little strange, but it allows us to link function calls to such symbols. Normally such a call will be guarded with a comparison, which will load a zero from the GOT. There's one example of such a function call in crti.o in Linux's CRT. As part of this change, I also needed to make the synthetic start and end symbols image base relative in the case where their sections were empty, so that PC-relative references to those symbols would continue to work. Differential Revision: http://reviews.llvm.org/D19844 llvm-svn: 268350
2016-05-03 09:21:08 +08:00
# CHECK: Dynamic Relocations {
# CHECK-NEXT: }
.globl _start
_start:
call __init_array_start@PLT