Building EFI binaries, particularly larger ones (like e.g. Xen does), on Linux
(where relocatable objects are in ELF format) so far led to all local (aka static) symbols to be discarded, making debugging quite a bit more difficult (like Linux, Xen builds an internal symbol lookup table from nm output generated on the binary produced by an earlier linking pass). Therefore, this patch arranges to insert all (relevant) local symbols from non-COFF objects into the final executable's symbol table between those coming from COFF input files and the global ones. bfd/ 2011-11-02 Jan Beulich <jbeulich@suse.com> * coffgen.c (coff_write_alien_symbol): Make public. Add 'struct internal_syment *' parameter. Extend 'dummy' to an array with two elements. Set n_numaux early. Handle BSF_FILE. (coff_write_symbols): Pass NULL as new third argument to coff_write_alien_symbol(). * cofflink.c (_bfd_coff_final_link): Don't use COFF-specific obj_raw_syment_count() on non-COFF input BFD. Insert local symbols from non-COFF input BFDs. * libcoff-in.h (coff_write_alien_symbol): Declare. * libcoff.h (coff_write_alien_symbol): Re-generate.
This commit is contained in:
Jan Beulich
parent
207d428dce
commit
e7ebb21483
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@ -1,3 +1,16 @@
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2011-11-02 Jan Beulich <jbeulich@suse.com>
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* coffgen.c (coff_write_alien_symbol): Make public. Add 'struct
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internal_syment *' parameter. Extend 'dummy' to an array with two
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elements. Set n_numaux early. Handle BSF_FILE.
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(coff_write_symbols): Pass NULL as new third argument to
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coff_write_alien_symbol().
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* cofflink.c (_bfd_coff_final_link): Don't use COFF-specific
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obj_raw_syment_count() on non-COFF input BFD. Insert local symbols
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from non-COFF input BFDs.
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* libcoff-in.h (coff_write_alien_symbol): Declare.
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* libcoff.h (coff_write_alien_symbol): Re-generate.
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2011-11-01 DJ Delorie <dj@redhat.com>
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* Makefile.am (ALL_MACHINES): Add cpu-rl78.lo.
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@ -983,31 +983,36 @@ coff_write_symbol (bfd *abfd,
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file originally. This symbol may have been created by the linker,
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or we may be linking a non COFF file to a COFF file. */
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static bfd_boolean
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bfd_boolean
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coff_write_alien_symbol (bfd *abfd,
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asymbol *symbol,
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struct internal_syment *isym,
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bfd_vma *written,
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bfd_size_type *string_size_p,
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asection **debug_string_section_p,
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bfd_size_type *debug_string_size_p)
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{
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combined_entry_type *native;
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combined_entry_type dummy;
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combined_entry_type dummy[2];
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asection *output_section = symbol->section->output_section
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? symbol->section->output_section
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: symbol->section;
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struct bfd_link_info *link_info = coff_data (abfd)->link_info;
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bfd_boolean ret;
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if ((!link_info || link_info->strip_discarded)
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&& !bfd_is_abs_section (symbol->section)
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&& symbol->section->output_section == bfd_abs_section_ptr)
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{
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symbol->name = "";
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if (isym != NULL)
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memset (isym, 0, sizeof(*isym));
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return TRUE;
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}
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native = &dummy;
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native = dummy;
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native->u.syment.n_type = T_NULL;
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native->u.syment.n_flags = 0;
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native->u.syment.n_numaux = 0;
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if (bfd_is_und_section (symbol->section))
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{
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native->u.syment.n_scnum = N_UNDEF;
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@ -1018,6 +1023,11 @@ coff_write_alien_symbol (bfd *abfd,
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native->u.syment.n_scnum = N_UNDEF;
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native->u.syment.n_value = symbol->value;
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}
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else if (symbol->flags & BSF_FILE)
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{
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native->u.syment.n_scnum = N_DEBUG;
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native->u.syment.n_numaux = 1;
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}
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else if (symbol->flags & BSF_DEBUGGING)
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{
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/* There isn't much point to writing out a debugging symbol
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@ -1025,6 +1035,8 @@ coff_write_alien_symbol (bfd *abfd,
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format. So, we just ignore them. We must clobber the symbol
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name to keep it from being put in the string table. */
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symbol->name = "";
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if (isym != NULL)
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memset (isym, 0, sizeof(*isym));
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return TRUE;
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}
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else
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@ -1045,16 +1057,20 @@ coff_write_alien_symbol (bfd *abfd,
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}
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native->u.syment.n_type = 0;
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if (symbol->flags & BSF_LOCAL)
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if (symbol->flags & BSF_FILE)
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native->u.syment.n_sclass = C_FILE;
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else if (symbol->flags & BSF_LOCAL)
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native->u.syment.n_sclass = C_STAT;
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else if (symbol->flags & BSF_WEAK)
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native->u.syment.n_sclass = obj_pe (abfd) ? C_NT_WEAK : C_WEAKEXT;
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else
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native->u.syment.n_sclass = C_EXT;
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native->u.syment.n_numaux = 0;
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return coff_write_symbol (abfd, symbol, native, written, string_size_p,
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debug_string_section_p, debug_string_size_p);
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ret = coff_write_symbol (abfd, symbol, native, written, string_size_p,
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debug_string_section_p, debug_string_size_p);
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if (isym != NULL)
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*isym = native->u.syment;
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return ret;
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}
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/* Write a native symbol to a COFF file. */
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@ -1170,8 +1186,8 @@ coff_write_symbols (bfd *abfd)
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if (c_symbol == (coff_symbol_type *) NULL
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|| c_symbol->native == (combined_entry_type *) NULL)
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{
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if (!coff_write_alien_symbol (abfd, symbol, &written, &string_size,
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&debug_string_section,
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if (!coff_write_alien_symbol (abfd, symbol, NULL, &written,
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&string_size, &debug_string_section,
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&debug_string_size))
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return FALSE;
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}
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@ -866,7 +866,7 @@ _bfd_coff_final_link (bfd *abfd,
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size_t sz;
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sub->output_has_begun = FALSE;
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sz = obj_raw_syment_count (sub);
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sz = bfd_family_coff (sub) ? obj_raw_syment_count (sub) : 2;
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if (sz > max_sym_count)
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max_sym_count = sz;
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}
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@ -943,6 +943,92 @@ _bfd_coff_final_link (bfd *abfd,
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}
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}
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if (finfo.info->strip != strip_all && finfo.info->discard != discard_all)
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{
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/* Add local symbols from foreign inputs. */
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for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
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{
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unsigned int i;
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if (bfd_family_coff (sub) || ! bfd_get_outsymbols (sub))
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continue;
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for (i = 0; i < bfd_get_symcount (sub); ++i)
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{
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asymbol *sym = bfd_get_outsymbols (sub) [i];
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file_ptr pos;
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struct internal_syment isym;
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bfd_size_type string_size = 0;
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bfd_vma written = 0;
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bfd_boolean rewrite = FALSE;
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if (! (sym->flags & BSF_LOCAL)
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|| (sym->flags & (BSF_SECTION_SYM | BSF_DEBUGGING_RELOC
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| BSF_THREAD_LOCAL | BSF_RELC | BSF_SRELC
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| BSF_SYNTHETIC))
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|| ((sym->flags & BSF_DEBUGGING)
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&& ! (sym->flags & BSF_FILE)))
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continue;
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/* See if we are discarding symbols with this name. */
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if ((finfo.info->strip == strip_some
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&& (bfd_hash_lookup (finfo.info->keep_hash,
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bfd_asymbol_name(sym), FALSE, FALSE)
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== NULL))
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|| (((finfo.info->discard == discard_sec_merge
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&& (bfd_get_section (sym)->flags & SEC_MERGE)
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&& ! finfo.info->relocatable)
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|| finfo.info->discard == discard_l)
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&& bfd_is_local_label_name (sub, bfd_asymbol_name(sym))))
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continue;
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pos = obj_sym_filepos (abfd) + obj_raw_syment_count (abfd)
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* symesz;
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if (bfd_seek (abfd, pos, SEEK_SET) != 0)
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goto error_return;
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if (! coff_write_alien_symbol(abfd, sym, &isym, &written,
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&string_size, NULL, NULL))
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goto error_return;
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if (string_size)
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{
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bfd_boolean hash = ! (abfd->flags & BFD_TRADITIONAL_FORMAT);
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bfd_size_type indx;
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indx = _bfd_stringtab_add (finfo.strtab,
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bfd_asymbol_name (sym), hash,
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FALSE);
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if (indx == (bfd_size_type) -1)
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goto error_return;
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isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
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bfd_coff_swap_sym_out (abfd, &isym, finfo.outsyms);
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rewrite = TRUE;
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}
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if (isym.n_sclass == C_FILE)
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{
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if (finfo.last_file_index != -1)
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{
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finfo.last_file.n_value = obj_raw_syment_count (abfd);
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bfd_coff_swap_sym_out (abfd, &finfo.last_file,
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finfo.outsyms);
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pos = obj_sym_filepos (abfd) + finfo.last_file_index
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* symesz;
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rewrite = TRUE;
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}
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finfo.last_file_index = obj_raw_syment_count (abfd);
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finfo.last_file = isym;
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}
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if (rewrite
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&& (bfd_seek (abfd, pos, SEEK_SET) != 0
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|| bfd_bwrite (finfo.outsyms, symesz, abfd) != symesz))
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goto error_return;
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obj_raw_syment_count (abfd) += written;
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}
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}
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}
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if (! bfd_coff_final_link_postscript (abfd, & finfo))
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goto error_return;
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@ -318,6 +318,9 @@ extern void coff_mangle_symbols
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(bfd *);
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extern bfd_boolean coff_write_symbols
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(bfd *);
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extern bfd_boolean coff_write_alien_symbol
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(bfd *, asymbol *, struct internal_syment *, bfd_vma *,
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bfd_size_type *, asection **, bfd_size_type *);
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extern bfd_boolean coff_write_linenumbers
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(bfd *);
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extern alent *coff_get_lineno
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@ -322,6 +322,9 @@ extern void coff_mangle_symbols
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(bfd *);
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extern bfd_boolean coff_write_symbols
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(bfd *);
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extern bfd_boolean coff_write_alien_symbol
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(bfd *, asymbol *, struct internal_syment *, bfd_vma *,
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bfd_size_type *, asection **, bfd_size_type *);
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extern bfd_boolean coff_write_linenumbers
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(bfd *);
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extern alent *coff_get_lineno
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