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llvm-project/lld/test/ELF/pie-weak.s

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[LLD] Mark a number of x86 only tests to require x86 Noticed while testing for an out of tree target. There are probably more tests that should be so marked. I'm not sure who owns these tests so I've added a few names I recognise from the recent history. With advice from probinson, ruiu, rafael and dramatically improved by davidb. Thank you all! Differential Revision: https://reviews.llvm.org/D34685 llvm-svn: 308335
2017-07-19 02:40:50 +08:00
# REQUIRES: x86
[ELF] Emit weak-undef symbols in .dynsym of a PIE binary only if linked against shared libs. Reviewers: espindola Subscribers: emaste, arichardson, MaskRay, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59275 llvm-svn: 356374
2019-03-18 23:32:57 +08:00
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %p/Inputs/dummy-shared.s -o %t1.o
# RUN: ld.lld %t1.o -shared -o %t1.so
This tests depends on non-relaxable relocations. Make that explicit. llvm-svn: 273013
2016-06-18 01:01:38 +08:00
# RUN: llvm-mc -filetype=obj -relax-relocations=false -triple=x86_64-unknown-linux %s -o %t.o
[ELF] Emit weak-undef symbols in .dynsym of a PIE binary only if linked against shared libs. Reviewers: espindola Subscribers: emaste, arichardson, MaskRay, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59275 llvm-svn: 356374
2019-03-18 23:32:57 +08:00
# RUN: ld.lld --hash-style=sysv -pie %t.o %t1.so -o %t
ELF: Do not create relative relocations for undefined symbols. We need to ensure that the address of an undefined weak symbol evaluates to zero. We were getting this right for non-PIC executables (where the symbol can be evaluated directly) and for DSOs (where we emit a symbolic relocation for these symbols, as they are preemptible). But we weren't getting it right for PIEs. Probably the simplest way to ensure that these symbols evaluate to zero is by not creating a relocation in .got for them. Differential Revision: http://reviews.llvm.org/D19044 llvm-svn: 266161
2016-04-13 10:24:48 +08:00
# RUN: llvm-readobj -r %t | FileCheck --check-prefix=RELOCS %s
# RUN: llvm-objdump -d %t | FileCheck --check-prefix=DISASM %s
# RELOCS: Relocations [
Keep some relocations with undefined weak symbols. This fixes pr34301. As the bug points out, we want to keep some relocations with undefined weak symbols. This means that we cannot always claim that these symbols are not preemptible as we do now. Unfortunately, we cannot also just always claim that they are preemptible. Doing so would, for example, cause us to try to create a plt entry when we don't even have a dynamic symbol table. What almost works is to say that weak undefined symbols are preemptible if and only if we have a dynamic symbol table. Almost because we don't want to fail the build trying to create a copy relocation to a weak undefined. llvm-svn: 313372
2017-09-16 02:05:02 +08:00
# RELOCS-NEXT: Section ({{.*}}) .rela.dyn {
# RELOCS-NEXT: R_X86_64_GLOB_DAT foo 0x0
# RELOCS-NEXT: }
ELF: Do not create relative relocations for undefined symbols. We need to ensure that the address of an undefined weak symbol evaluates to zero. We were getting this right for non-PIC executables (where the symbol can be evaluated directly) and for DSOs (where we emit a symbolic relocation for these symbols, as they are preemptible). But we weren't getting it right for PIEs. Probably the simplest way to ensure that these symbols evaluate to zero is by not creating a relocation in .got for them. Differential Revision: http://reviews.llvm.org/D19044 llvm-svn: 266161
2016-04-13 10:24:48 +08:00
# RELOCS-NEXT: ]
.weak foo
.globl _start
_start:
# DISASM: _start:
[ELF] Emit weak-undef symbols in .dynsym of a PIE binary only if linked against shared libs. Reviewers: espindola Subscribers: emaste, arichardson, MaskRay, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59275 llvm-svn: 356374
2019-03-18 23:32:57 +08:00
# DISASM-NEXT: 1000: 48 8b 05 a9 10 00 00 movq 4265(%rip), %rax
ELF: Do not create relative relocations for undefined symbols. We need to ensure that the address of an undefined weak symbol evaluates to zero. We were getting this right for non-PIC executables (where the symbol can be evaluated directly) and for DSOs (where we emit a symbolic relocation for these symbols, as they are preemptible). But we weren't getting it right for PIEs. Probably the simplest way to ensure that these symbols evaluate to zero is by not creating a relocation in .got for them. Differential Revision: http://reviews.llvm.org/D19044 llvm-svn: 266161
2016-04-13 10:24:48 +08:00
# ^ .got - (.text + 7)
mov foo@gotpcrel(%rip), %rax