llvm-project/lld/test/ELF/relocation-relative-synthet...

# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
# RUN: ld.lld %t.o -o %t -pie
# RUN: llvm-readobj -dyn-relocations %t | FileCheck %s

# CHECK:      Dynamic Relocations {
# CHECK-NEXT: }

.globl _start
_start:
call __init_array_start@PLT
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`
			`# RUN: llvm-readobj -dyn-relocations %t \| FileCheck %s`

			`# CHECK: Dynamic Relocations {`
			`# CHECK-NEXT: }`

			`.globl _start`
			`_start:`
			`call __init_array_start@PLT`