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llvm-project/lld/test/ELF/relocation-relative-absolute.s

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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
[ELF] - Better diagnostic for relative relocation to an absolute value error. Patch adds a filename to that error message. I faced next error when debugged one of FreeBSD port: error: relocation R_X86_64_PLT32 cannot refer to absolute symbol __tls_get_addr error message was poor and this patch improves it to show the locations of symbol declaration and using. Differential revision: https://reviews.llvm.org/D26508 llvm-svn: 286940
2016-11-15 16:07:14 +08:00
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %tinput1.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux \
# RUN: %S/Inputs/relocation-relative-absolute.s -o %tinput2.o
[ELF] Replace unused output filenames with /dev/null in tests Post commit review at rLLD335992 llvm-svn: 336129
2018-07-03 01:48:23 +08:00
# RUN: not ld.lld %tinput1.o %tinput2.o -o /dev/null -pie 2>&1 | 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
.globl _start
_start:
Change the error message format for an incompatible relocation. Previous error message style: error: /home/alice/src/bar.c:12: relocation R_X86_64_PLT32 cannot refer to absolute symbol 'answer' defined in /home/alice/src/foo.o New error message style: error: relocation R_X86_64_PLT32 cannot refer to absolute symbol: foo >>> defined in /home/alice/src/foo.o >>> referenced by bar.c:12 (/home/alice/src/bar.c:12) >>> /home/alice/src/bar.o:(.text+0x1) llvm-svn: 299390
2017-04-04 05:36:31 +08:00
# CHECK: error: relocation R_X86_64_PLT32 cannot refer to absolute symbol: answer
# CHECK-NEXT: >>> defined in {{.*}}input2.o
# CHECK-NEXT: >>> referenced by {{.*}}o:(.text+0x1)
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
[ELF] - Better diagnostic for relative relocation to an absolute value error. Patch adds a filename to that error message. I faced next error when debugged one of FreeBSD port: error: relocation R_X86_64_PLT32 cannot refer to absolute symbol __tls_get_addr error message was poor and this patch improves it to show the locations of symbol declaration and using. Differential revision: https://reviews.llvm.org/D26508 llvm-svn: 286940
2016-11-15 16:07:14 +08:00
call answer@PLT