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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-01-15 18:06:48 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-01-15 18:07:07 -0800 |
| commit | 68b007788a6cc5376708af42bc220f540e8c4b8a (patch) | |
| tree | ea89e2a6a9e242932f93752ba6df8c19a15caf79 /ld/ld.texi | |
| parent | ad92f33d386e050304bf5986f28071ede9dd2284 (diff) | |
| download | gdb-68b007788a6cc5376708af42bc220f540e8c4b8a.zip gdb-68b007788a6cc5376708af42bc220f540e8c4b8a.tar.gz gdb-68b007788a6cc5376708af42bc220f540e8c4b8a.tar.bz2 | |
ld/x86: Add -z report-relative-reloc
Linker generated relative relocations don't have symbol info:
[hjl@gnu-cfl-2 tmpdir]$ readelf -rW dump
Relocation section '.rela.dyn' at offset 0x180 contains 2 entries:
Offset Info Type Sym. Value Symbol's Name + Addend
00002f70 00000008 R_X86_64_RELATIVE 1000
00002f68 00000025 R_X86_64_IRELATIVE 1007
[hjl@gnu-cfl-2 tmpdir]$
Add -z report-relative-reloc to x86 ELF linker to report dynamic relative
relocations:
[hjl@gnu-cfl-2 tmpdir]$ ../ld-new -pie -melf32_x86_64 -z report-relative-reloc -o dump report-reloc-1.o
dump: R_X86_64_IRELATIVE (offset: 0x00002f68, info: 0x00000025, addend: 0x00001007) against 'ifunc' for section '.data.rel.ro.local' in report-reloc-1.o
dump: R_X86_64_RELATIVE (offset: 0x00002f70, info: 0x00000008, addend: 0x00001000) against '_start' for section '.data.rel.ro.local' in report-reloc-1.o
[hjl@gnu-cfl-2 tmpdir]$
It can be used to map relative relocations to corresponding symbols.
bfd/
* elf-linker-x86.h (elf_linker_x86_params): Add
report_relative_reloc.
* elf32-i386.c (elf_i386_relocate_section): Call
_bfd_x86_elf_link_report_relative_reloc to report relative
relocations for -z report-relative-reloc.
(elf_i386_finish_dynamic_symbol): Likewse.
* elf64-x86-64.c (elf_x86_64_relocate_section): Likewse.
(elf_x86_64_finish_dynamic_symbol): Likewse.
* elfxx-x86.c (_bfd_x86_elf_link_report_relative_reloc): New
function.
* elfxx-x86.h (_bfd_x86_elf_link_report_relative_reloc): New
prototype.
ld/
* NEWS: Mention -z report-relative-reloc.
* ld.texi: Document -z report-relative-reloc.
* emulparams/elf32_x86_64.sh: Source x86-report-relative.sh.
* emulparams/elf_i386.sh: Likewse.
* emulparams/elf_x86_64.sh: Likewse.
* emulparams/x86-report-relative.sh: New file.
* testsuite/ld-i386/report-reloc-1.d: Likewse.
* testsuite/ld-i386/report-reloc-1.l: Likewse.
* testsuite/ld-i386/report-reloc-1.s: Likewse.
* testsuite/ld-x86-64/report-reloc-1-x32.d: Likewse.
* testsuite/ld-x86-64/report-reloc-1.d: Likewse.
* testsuite/ld-x86-64/report-reloc-1.l: Likewse.
* testsuite/ld-x86-64/report-reloc-1.s: Likewse.
* testsuite/ld-i386/i386.exp: Run report-reloc-1.
* testsuite/ld-x86-64/x86-64.exp: Run report-reloc-1 and
report-reloc-1-x32.
Diffstat (limited to 'ld/ld.texi')
| -rw-r--r-- | ld/ld.texi | 4 |
1 files changed, 4 insertions, 0 deletions
@@ -1426,6 +1426,10 @@ relocation, if supported. Specifying @samp{common-page-size} smaller than the system page size will render this protection ineffective. Don't create an ELF @code{PT_GNU_RELRO} segment if @samp{norelro}. +@item report-relative-reloc +Report dynamic relative relocations generated by linker. Supported for +Linux/i386 and Linux/x86_64. + @item separate-code @itemx noseparate-code Create separate code @code{PT_LOAD} segment header in the object. This |