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llvm-project/lld/test/ELF/i386-tls-le-undef.s

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[ELF] Fix getRelocTargetVA formulae of R_TLS and R_NEG_TLS For R_TLS: 1) Delete Sym.isTls() . The assembler ensures the symbol is STT_TLS. If not (the input is broken), we would crash (dereferencing null Out::TlsPhdr). 2) Change Sym.isUndefWeak() to Sym.isUndefined(), otherwise with --noinhibit-exec we would still evaluate the symbol and crash. 3) Return A if the symbol is undefined. This is PR40570. The case is probably unrealistic but returning A matches R_ABS and the behavior of several dynamic loaders. R_NEG_TLS is obsoleted Sun TLS we don't fully support, but R_RELAX_TLS_GD_TO_LE_NEG is still used by GD->LE relaxation (subl $var@tpoff,%eax). They should add the addend. Unfortunately I can't test it as compilers don't seem to generate non-zero implicit addends. Reviewed By: ruiu Differential Revision: https://reviews.llvm.org/D62098 llvm-svn: 361146
2019-05-20 19:47:31 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=i386 %s -o %t.o
# RUN: ld.lld --noinhibit-exec %t.o -o %t 2>&1
# RUN: llvm-objdump -d %t | FileCheck %s
## Undefined TLS symbols resolve to 0.
## In --noinhibit-exec mode, a non-weak undefined symbol is not an error.
# CHECK: subl $0, %eax
# CHECK: subl $0, %eax
.weak weak_undef
movl %gs:0, %eax
subl $weak_undef@tpoff,%eax
movl %gs:0, %eax
subl $undef@tpoff,%eax