diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2020-03-04 20:32:35 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2023-06-29 10:29:47 -0700 |
| commit | 46675b6b8160e97485583522852ad86507bd9072 (patch) | |
| tree | 7db5843df9cdc601838344c9b077f9f80e3d961e /bfd/elflink.c | |
| parent | 02c1ba6c94d4bb3f53dfeeb4401c8434c7834a32 (diff) | |
| download | gdb-46675b6b8160e97485583522852ad86507bd9072.zip gdb-46675b6b8160e97485583522852ad86507bd9072.tar.gz gdb-46675b6b8160e97485583522852ad86507bd9072.tar.bz2 | |
bfd: Improve nm and objdump without section header
When there is no section header in an executable or shared library, we
reconstruct dynamic symbol table from the PT_DYNAMIC segment, which
contains DT_HASH/DT_GNU_HASH/DT_MIPS_XHASH, DT_STRTAB, DT_SYMTAB,
DT_STRSZ, and DT_SYMENT entries, to improve nm and objdump. For DT_HASH,
the number of dynamic symbol table entries equals the number of chains.
For DT_GNU_HASH/DT_MIPS_XHASH, only defined symbols with non-STB_LOCAL
indings are in hash table. Since DT_GNU_HASH/DT_MIPS_XHASH place all
symbols with STB_LOCAL binding before symbols with other bindings and
all undefined symbols defined ones in dynamic symbol table, the highest
symbol index in DT_GNU_HASH/DT_MIPS_XHASH is the highest dynamic symbol
table index. We can also get symbol version from DT_VERSYM, DT_VERDEF
and DT_VERNEED entries.
dt_symtab, dt_versym, dt_verdef, dt_verneed, dt_symtab_count,
dt_verdef_count, dt_verneed_count and dt_strtab are added to
elf_obj_tdata to store dynamic symbol table information.
PR ld/25617
* elf-bfd.h (elf_obj_tdata): Add dt_symtab, dt_verdef, dt_verneed,
dt_symtab_count, dt_verdef_count, dt_verneed_count and dt_strtab.
(elf_use_dt_symtab_p): New.
(_bfd_elf_get_dynamic_symbols): Likewise.
(_bfd_elf_get_section_from_dynamic_symbol): Likewise.
* elf.c (bfd_elf_get_elf_syms): Use dynamic symbol table if
neeeded.
(_bfd_elf_get_dynamic_symtab_upper_bound): Likewise.
(_bfd_elf_slurp_version_tables): Likewise.
(offset_from_vma): New function.
(get_hash_table_data): Likewise.
(_bfd_elf_get_dynamic_symbols): Likewise.
(_bfd_elf_get_section_from_dynamic_symbol): Likewise.
(_bfd_elf_get_symbol_version_name): Likewise.
* elfcode.h (elf_object_p): Call _bfd_elf_get_dynamic_symbols
to reconstruct dynamic symbol table from PT_DYNAMIC segment if
there is no section header.
(elf_slurp_symbol_table): Use dynamic symbol table if neeeded.
Don't free isymbuf when dynamic symbol table is used.
* elflink.c (elf_link_is_defined_archive_symbol): Return wrong
format error when dynamic symbol table is used.
(elf_link_add_object_symbols): Likewise.
Diffstat (limited to 'bfd/elflink.c')
| -rw-r--r-- | bfd/elflink.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/bfd/elflink.c b/bfd/elflink.c index 4f87900..7217c2f 100644 --- a/bfd/elflink.c +++ b/bfd/elflink.c @@ -3571,6 +3571,12 @@ elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef) if (! bfd_check_format (abfd, bfd_object)) return false; + if (elf_use_dt_symtab_p (abfd)) + { + bfd_set_error (bfd_error_wrong_format); + return false; + } + /* Select the appropriate symbol table. If we don't know if the object file is an IR object, give linker LTO plugin a chance to get the correct symbol table. */ @@ -4233,6 +4239,12 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info) htab = elf_hash_table (info); bed = get_elf_backend_data (abfd); + if (elf_use_dt_symtab_p (abfd)) + { + bfd_set_error (bfd_error_wrong_format); + return false; + } + if ((abfd->flags & DYNAMIC) == 0) dynamic = false; else |