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llvm-project/lld/test/ELF/gnu-ifunc-relative.s

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[ELF] Move `// REQUIRES:` line to the top llvm-svn: 335676
2018-06-27 06:20:04 +08:00
// REQUIRES: x86
Fix addend computation for IRELATIVE relocations. llvm-svn: 259692
2016-02-04 05:02:48 +08:00
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
[ELF] Fallback to sh_link=0 if neither .dynsym nor .symtab exists Summary: .rela.plt may only contain R_*_{,I}RELATIVE relocations and not need a symbol table link. bfd/gold fallbacks to sh_link=0 in this case. Without this patch, ld.lld --strip-all caused lld to dereference a null pointer. Reviewers: ruiu, grimar, espindola Reviewed By: ruiu Subscribers: emaste, arichardson, llvm-commits Differential Revision: https://reviews.llvm.org/D53881 llvm-svn: 345648
2018-10-31 04:54:54 +08:00
// RUN: ld.lld --strip-all %t.o -o %t
// RUN: llvm-readobj -r %t | FileCheck %s
// RUN: ld.lld %t.o -o %t
[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 -r --symbols %t | FileCheck %s --check-prefixes=CHECK,SYM
Fix addend computation for IRELATIVE relocations. llvm-svn: 259692
2016-02-04 05:02:48 +08:00
.type foo STT_GNU_IFUNC
.globl foo
foo:
ret
.globl _start
_start:
call foo
[ELF] Move R_*_IRELATIVE from .rel[a].plt to .rel[a].dyn unless --pack-dyn-relocs=android[+relr] An R_*_IRELATIVE represents the address of a STT_GNU_IFUNC symbol (redirected at runtime) which is non-preemptable and is not associated with a canonical PLT (associated with a symbol with a section index of SHN_UNDEF but a non-zero st_value). .rel[a].plt [DT_JMPREL, DT_JMPREL+DT_JMPRELSZ) contains relocations that can be lazily resolved. R_*_IRELATIVE are always eagerly resolved, so conceptually they do not belong to .rela.plt. "iplt" is mostly a misnomer. glibc powerpc and powerpc64 do not resolve R_*_IRELATIVE if they are in .rela.plt. // a.o - synthesized PLT call stub has an R_*_IRELATIVE void ifunc(); int main() { ifunc(); } // b.o static void real() {} asm (".type ifunc, %gnu_indirect_function"); void *ifunc() { return ℜ } The lld-linked executable crashes. ld.bfd places R_*_IRELATIVE in .rela.dyn and the executable works. glibc i386, x86_64, and aarch64 have logic (glibc/sysdeps/*/dl-machine.h:elf_machine_lazy_rel) to eagerly resolve R_*_IRELATIVE in .rel[a].plt so the lld-linked executable works. Move R_*_IRELATIVE from .rel[a].plt to .rel[a].dyn to fix the crashes on glibc powerpc/powerpc64. This also helps simplifying ifunc implementation in FreeBSD rtld-elf powerpc64. If --pack-dyn-relocs=android[+relr] is specified, the Android packed dynamic relocation format is used for .rela.dyn. We cannot name in.relaIplt ".rela.dyn" because the output section will have mixed formats. This can be improved in the future. Reviewed By: pcc Differential Revision: https://reviews.llvm.org/D65651 llvm-svn: 367745
2019-08-03 10:26:52 +08:00
// CHECK: Section ({{.*}}) .rela.dyn {
Fix addend computation for IRELATIVE relocations. llvm-svn: 259692
2016-02-04 05:02:48 +08:00
// CHECK-NEXT: R_X86_64_IRELATIVE - 0x[[ADDR:.*]]
// CHECK-NEXT: }
[ELF] Fallback to sh_link=0 if neither .dynsym nor .symtab exists Summary: .rela.plt may only contain R_*_{,I}RELATIVE relocations and not need a symbol table link. bfd/gold fallbacks to sh_link=0 in this case. Without this patch, ld.lld --strip-all caused lld to dereference a null pointer. Reviewers: ruiu, grimar, espindola Reviewed By: ruiu Subscribers: emaste, arichardson, llvm-commits Differential Revision: https://reviews.llvm.org/D53881 llvm-svn: 345648
2018-10-31 04:54:54 +08:00
// SYM: Name: foo
// SYM-NEXT: Value: 0x[[ADDR]]
// SYM-NEXT: Size: 0
// SYM-NEXT: Binding: Global
// SYM-NEXT: Type: GNU_IFunc