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llvm-project/lld/test/ELF/linkerscript/orphan-report.s

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[ELF] - Report orphan sections if -verbose given. When -verbose is specified, patch outputs names of each input orphan section assigned to output. Differential revision: https://reviews.llvm.org/D37517 llvm-svn: 314098
2017-09-25 17:41:32 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
# RUN: echo "SECTIONS { .text : { *(.text.1) } }" > %t.script
[ELF] - Implement --orphan-handling option. It is PR34946. Spec (http://man7.org/linux/man-pages/man1/ld.1.html) tells about --orphan-handling=MODE, option where MODE can be one of four: "place", "discard", "warn", "error". Currently we already report orphans when -verbose given, what becomes excessive with option implemented. Patch stops reporting orphans when -versbose is given, and support "place", "warn" and "error" modes. It is not yet clear that "discard" mode is useful so it is not supported. Differential revision: https://reviews.llvm.org/D39000 llvm-svn: 316583
2017-10-25 23:20:30 +08:00
## Check we do not report orphans by default even with -verbose.
# RUN: ld.lld -shared -o %t.out --script %t.script %t.o 2>&1 -verbose \
# RUN: | FileCheck %s --check-prefix=DEFAULT
# DEFAULT-NOT: placed
## Check --orphan-handling=place has the same behavior as default.
# RUN: ld.lld -shared --orphan-handling=place -o %t.out --script %t.script \
# RUN: %t.o 2>&1 -verbose -error-limit=0 | FileCheck %s --check-prefix=DEFAULT
## Check --orphan-handling=error reports errors about orphans.
[ELF][test] Change -o %t to -o /dev/null if the output is not needed
2020-02-13 13:48:45 +08:00
# RUN: not ld.lld -shared --orphan-handling=error -o /dev/null --script %t.script \
[ELF] - Implement --orphan-handling option. It is PR34946. Spec (http://man7.org/linux/man-pages/man1/ld.1.html) tells about --orphan-handling=MODE, option where MODE can be one of four: "place", "discard", "warn", "error". Currently we already report orphans when -verbose given, what becomes excessive with option implemented. Patch stops reporting orphans when -versbose is given, and support "place", "warn" and "error" modes. It is not yet clear that "discard" mode is useful so it is not supported. Differential revision: https://reviews.llvm.org/D39000 llvm-svn: 316583
2017-10-25 23:20:30 +08:00
# RUN: %t.o 2>&1 -verbose -error-limit=0 | FileCheck %s --check-prefix=REPORT
# REPORT: {{.*}}.o:(.text) is being placed in '.text'
# REPORT-NEXT: {{.*}}.o:(.text.2) is being placed in '.text'
# REPORT-NEXT: <internal>:(.comment) is being placed in '.comment'
# REPORT-NEXT: <internal>:(.bss) is being placed in '.bss'
# REPORT-NEXT: <internal>:(.bss.rel.ro) is being placed in '.bss.rel.ro'
# REPORT-NEXT: <internal>:(.dynsym) is being placed in '.dynsym'
# REPORT-NEXT: <internal>:(.gnu.version) is being placed in '.gnu.version'
# REPORT-NEXT: <internal>:(.gnu.version_r) is being placed in '.gnu.version_r'
# REPORT-NEXT: <internal>:(.gnu.hash) is being placed in '.gnu.hash'
# REPORT-NEXT: <internal>:(.hash) is being placed in '.hash'
# REPORT-NEXT: <internal>:(.dynamic) is being placed in '.dynamic'
# REPORT-NEXT: <internal>:(.dynstr) is being placed in '.dynstr'
# REPORT-NEXT: <internal>:(.rela.dyn) is being placed in '.rela.dyn'
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
# REPORT-NEXT: <internal>:(.eh_frame) is being placed in '.eh_frame'
[ELF] - Implement --orphan-handling option. It is PR34946. Spec (http://man7.org/linux/man-pages/man1/ld.1.html) tells about --orphan-handling=MODE, option where MODE can be one of four: "place", "discard", "warn", "error". Currently we already report orphans when -verbose given, what becomes excessive with option implemented. Patch stops reporting orphans when -versbose is given, and support "place", "warn" and "error" modes. It is not yet clear that "discard" mode is useful so it is not supported. Differential revision: https://reviews.llvm.org/D39000 llvm-svn: 316583
2017-10-25 23:20:30 +08:00
# REPORT-NEXT: <internal>:(.got) is being placed in '.got'
# REPORT-NEXT: <internal>:(.got.plt) is being placed in '.got.plt'
# REPORT-NEXT: <internal>:(.got.plt) is being placed in '.got.plt'
# REPORT-NEXT: <internal>:(.rela.plt) is being placed in '.rela.plt'
[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 &real; } 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
# REPORT-NEXT: <internal>:(.rela.dyn) is being placed in '.rela.dyn'
[ELF] - Implement --orphan-handling option. It is PR34946. Spec (http://man7.org/linux/man-pages/man1/ld.1.html) tells about --orphan-handling=MODE, option where MODE can be one of four: "place", "discard", "warn", "error". Currently we already report orphans when -verbose given, what becomes excessive with option implemented. Patch stops reporting orphans when -versbose is given, and support "place", "warn" and "error" modes. It is not yet clear that "discard" mode is useful so it is not supported. Differential revision: https://reviews.llvm.org/D39000 llvm-svn: 316583
2017-10-25 23:20:30 +08:00
# REPORT-NEXT: <internal>:(.plt) is being placed in '.plt'
[ELF] Rename .plt to .iplt and decrease EM_PPC{,64} alignment of .glink to 4 GNU ld creates the synthetic section .iplt, and has a built-in linker script that assigns .iplt to the output section .plt . There is no output section named .iplt . Making .iplt an output section actually has a benefit that makes the tricky toolchain feature stand out. Symbolizers don't have to deal with mixed PLT entries (e.g. llvm-objdump -d incorrectly annotates such jump targets). On EM_PPC{,64}, .glink contains a PLT resolver and a series of jump instructions. The 4-byte entry size makes it unnecessary to have an alignment of 16. Mark ppc32-gnu-ifunc.s and ppc32-gnu-ifunc-nonpreemptable.s as `XFAIL: *`. They test IPLT on EM_PPC, which never works. Reviewed By: peter.smith Differential Revision: https://reviews.llvm.org/D71520
2019-12-15 08:19:03 +08:00
# REPORT-NEXT: <internal>:(.iplt) is being placed in '.iplt'
[ELF] - Implement --orphan-handling option. It is PR34946. Spec (http://man7.org/linux/man-pages/man1/ld.1.html) tells about --orphan-handling=MODE, option where MODE can be one of four: "place", "discard", "warn", "error". Currently we already report orphans when -verbose given, what becomes excessive with option implemented. Patch stops reporting orphans when -versbose is given, and support "place", "warn" and "error" modes. It is not yet clear that "discard" mode is useful so it is not supported. Differential revision: https://reviews.llvm.org/D39000 llvm-svn: 316583
2017-10-25 23:20:30 +08:00
# REPORT-NEXT: <internal>:(.symtab) is being placed in '.symtab'
[ELF] Fix typo: .symtab_shndxr -> .symtab_shndx The typo was introduced to llvm MC in rL204769 (fixed in rL358247) and then to lld. Also, for relocatable-many-sections.s, the size of .symtab changed at some point and the formula needs update. llvm-svn: 358248
2019-04-12 10:20:52 +08:00
# REPORT-NEXT: <internal>:(.symtab_shndx) is being placed in '.symtab_shndx'
[ELF] - Implement --orphan-handling option. It is PR34946. Spec (http://man7.org/linux/man-pages/man1/ld.1.html) tells about --orphan-handling=MODE, option where MODE can be one of four: "place", "discard", "warn", "error". Currently we already report orphans when -verbose given, what becomes excessive with option implemented. Patch stops reporting orphans when -versbose is given, and support "place", "warn" and "error" modes. It is not yet clear that "discard" mode is useful so it is not supported. Differential revision: https://reviews.llvm.org/D39000 llvm-svn: 316583
2017-10-25 23:20:30 +08:00
# REPORT-NEXT: <internal>:(.shstrtab) is being placed in '.shstrtab'
# REPORT-NEXT: <internal>:(.strtab) is being placed in '.strtab'
## Check --orphan-handling=warn reports warnings about orphans.
# RUN: ld.lld -shared --orphan-handling=warn -o %t.out --script %t.script \
# RUN: %t.o 2>&1 -verbose | FileCheck %s --check-prefix=REPORT
[ELF][test] Change -o %t to -o /dev/null if the output is not needed
2020-02-13 13:48:45 +08:00
# RUN: not ld.lld --orphan-handling=foo -o /dev/null --script %t.script %t.o 2>&1 \
[ELF] - Implement --orphan-handling option. It is PR34946. Spec (http://man7.org/linux/man-pages/man1/ld.1.html) tells about --orphan-handling=MODE, option where MODE can be one of four: "place", "discard", "warn", "error". Currently we already report orphans when -verbose given, what becomes excessive with option implemented. Patch stops reporting orphans when -versbose is given, and support "place", "warn" and "error" modes. It is not yet clear that "discard" mode is useful so it is not supported. Differential revision: https://reviews.llvm.org/D39000 llvm-svn: 316583
2017-10-25 23:20:30 +08:00
# RUN: | FileCheck %s --check-prefix=UNKNOWN
# UNKNOWN: unknown --orphan-handling mode: foo
[ELF] - Report orphan sections if -verbose given. When -verbose is specified, patch outputs names of each input orphan section assigned to output. Differential revision: https://reviews.llvm.org/D37517 llvm-svn: 314098
2017-09-25 17:41:32 +08:00
.section .text.1,"a"
nop
.section .text.2,"a"
nop