https://sourceware.org/bugzilla/show_bug.cgi?id=25617
--- Comment #46 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by H.J. Lu <h...@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=46675b6b8160e97485583522852ad86507bd9072 commit 46675b6b8160e97485583522852ad86507bd9072 Author: H.J. Lu <hjl.to...@gmail.com> Date: Wed Mar 4 20:32:35 2020 -0800 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. -- You are receiving this mail because: You are on the CC list for the bug.
