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- /* POWER/PowerPC XCOFF linker support.
- Copyright (C) 1995-2022 Free Software Foundation, Inc.
- Written by Ian Lance Taylor <ian@cygnus.com>, Cygnus Support.
- This file is part of BFD, the Binary File Descriptor library.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- MA 02110-1301, USA. */
- #include "sysdep.h"
- #include "bfd.h"
- #include "bfdlink.h"
- #include "libbfd.h"
- #include "coff/internal.h"
- #include "coff/xcoff.h"
- #include "libcoff.h"
- #include "libxcoff.h"
- #include "libiberty.h"
- #include "xcofflink.h"
- /* This file holds the XCOFF linker code. */
- #undef STRING_SIZE_SIZE
- #define STRING_SIZE_SIZE 4
- /* The list of import files. */
- struct xcoff_import_file
- {
- /* The next entry in the list. */
- struct xcoff_import_file *next;
- /* The path. */
- const char *path;
- /* The file name. */
- const char *file;
- /* The member name. */
- const char *member;
- };
- /* Information we keep for each section in the output file during the
- final link phase. */
- struct xcoff_link_section_info
- {
- /* The relocs to be output. */
- struct internal_reloc *relocs;
- /* For each reloc against a global symbol whose index was not known
- when the reloc was handled, the global hash table entry. */
- struct xcoff_link_hash_entry **rel_hashes;
- /* If there is a TOC relative reloc against a global symbol, and the
- index of the TOC symbol is not known when the reloc was handled,
- an entry is added to this linked list. This is not an array,
- like rel_hashes, because this case is quite uncommon. */
- struct xcoff_toc_rel_hash
- {
- struct xcoff_toc_rel_hash *next;
- struct xcoff_link_hash_entry *h;
- struct internal_reloc *rel;
- } *toc_rel_hashes;
- };
- /* Information that the XCOFF linker collects about an archive. */
- struct xcoff_archive_info
- {
- /* The archive described by this entry. */
- bfd *archive;
- /* The import path and import filename to use when referring to
- this archive in the .loader section. */
- const char *imppath;
- const char *impfile;
- /* True if the archive contains a dynamic object. */
- unsigned int contains_shared_object_p : 1;
- /* True if the previous field is valid. */
- unsigned int know_contains_shared_object_p : 1;
- };
- struct xcoff_link_hash_table
- {
- struct bfd_link_hash_table root;
- /* The .debug string hash table. We need to compute this while
- reading the input files, so that we know how large the .debug
- section will be before we assign section positions. */
- struct bfd_strtab_hash *debug_strtab;
- /* The .debug section we will use for the final output. */
- asection *debug_section;
- /* The .loader section we will use for the final output. */
- asection *loader_section;
- /* A count of non TOC relative relocs which will need to be
- allocated in the .loader section. */
- size_t ldrel_count;
- /* The .loader section header. */
- struct internal_ldhdr ldhdr;
- /* The .gl section we use to hold global linkage code. */
- asection *linkage_section;
- /* The .tc section we use to hold toc entries we build for global
- linkage code. */
- asection *toc_section;
- /* The .ds section we use to hold function descriptors which we
- create for exported symbols. */
- asection *descriptor_section;
- /* The list of import files. */
- struct xcoff_import_file *imports;
- /* Required alignment of sections within the output file. */
- unsigned long file_align;
- /* Whether the .text section must be read-only. */
- bool textro;
- /* Whether -brtl was specified. */
- bool rtld;
- /* Whether garbage collection was done. */
- bool gc;
- /* A linked list of symbols for which we have size information. */
- struct xcoff_link_size_list
- {
- struct xcoff_link_size_list *next;
- struct xcoff_link_hash_entry *h;
- bfd_size_type size;
- }
- *size_list;
- /* Information about archives. */
- htab_t archive_info;
- /* Magic sections: _text, _etext, _data, _edata, _end, end. */
- asection *special_sections[XCOFF_NUMBER_OF_SPECIAL_SECTIONS];
- };
- /* Information that we pass around while doing the final link step. */
- struct xcoff_final_link_info
- {
- /* General link information. */
- struct bfd_link_info *info;
- /* Output BFD. */
- bfd *output_bfd;
- /* Hash table for long symbol names. */
- struct bfd_strtab_hash *strtab;
- /* Array of information kept for each output section, indexed by the
- target_index field. */
- struct xcoff_link_section_info *section_info;
- /* Symbol index of last C_FILE symbol (-1 if none). */
- long last_file_index;
- /* Contents of last C_FILE symbol. */
- struct internal_syment last_file;
- /* Symbol index of TOC symbol. */
- long toc_symindx;
- /* Start of .loader symbols. */
- bfd_byte *ldsym;
- /* Next .loader reloc to swap out. */
- bfd_byte *ldrel;
- /* File position of start of line numbers. */
- file_ptr line_filepos;
- /* Buffer large enough to hold swapped symbols of any input file. */
- struct internal_syment *internal_syms;
- /* Buffer large enough to hold output indices of symbols of any
- input file. */
- long *sym_indices;
- /* Buffer large enough to hold output symbols for any input file. */
- bfd_byte *outsyms;
- /* Buffer large enough to hold external line numbers for any input
- section. */
- bfd_byte *linenos;
- /* Buffer large enough to hold any input section. */
- bfd_byte *contents;
- /* Buffer large enough to hold external relocs of any input section. */
- bfd_byte *external_relocs;
- };
- static bool xcoff_mark (struct bfd_link_info *, asection *);
- /* Routines to read XCOFF dynamic information. This don't really
- belong here, but we already have the ldsym manipulation routines
- here. */
- /* Read the contents of a section. */
- static bool
- xcoff_get_section_contents (bfd *abfd, asection *sec)
- {
- if (coff_section_data (abfd, sec) == NULL)
- {
- size_t amt = sizeof (struct coff_section_tdata);
- sec->used_by_bfd = bfd_zalloc (abfd, amt);
- if (sec->used_by_bfd == NULL)
- return false;
- }
- if (coff_section_data (abfd, sec)->contents == NULL)
- {
- bfd_byte *contents;
- if (! bfd_malloc_and_get_section (abfd, sec, &contents))
- {
- free (contents);
- return false;
- }
- coff_section_data (abfd, sec)->contents = contents;
- }
- return true;
- }
- /* Get the size required to hold the dynamic symbols. */
- long
- _bfd_xcoff_get_dynamic_symtab_upper_bound (bfd *abfd)
- {
- asection *lsec;
- bfd_byte *contents;
- struct internal_ldhdr ldhdr;
- if ((abfd->flags & DYNAMIC) == 0)
- {
- bfd_set_error (bfd_error_invalid_operation);
- return -1;
- }
- lsec = bfd_get_section_by_name (abfd, ".loader");
- if (lsec == NULL)
- {
- bfd_set_error (bfd_error_no_symbols);
- return -1;
- }
- if (! xcoff_get_section_contents (abfd, lsec))
- return -1;
- contents = coff_section_data (abfd, lsec)->contents;
- bfd_xcoff_swap_ldhdr_in (abfd, (void *) contents, &ldhdr);
- return (ldhdr.l_nsyms + 1) * sizeof (asymbol *);
- }
- /* Get the dynamic symbols. */
- long
- _bfd_xcoff_canonicalize_dynamic_symtab (bfd *abfd, asymbol **psyms)
- {
- asection *lsec;
- bfd_byte *contents;
- struct internal_ldhdr ldhdr;
- const char *strings;
- bfd_byte *elsym, *elsymend;
- coff_symbol_type *symbuf;
- if ((abfd->flags & DYNAMIC) == 0)
- {
- bfd_set_error (bfd_error_invalid_operation);
- return -1;
- }
- lsec = bfd_get_section_by_name (abfd, ".loader");
- if (lsec == NULL)
- {
- bfd_set_error (bfd_error_no_symbols);
- return -1;
- }
- if (! xcoff_get_section_contents (abfd, lsec))
- return -1;
- contents = coff_section_data (abfd, lsec)->contents;
- coff_section_data (abfd, lsec)->keep_contents = true;
- bfd_xcoff_swap_ldhdr_in (abfd, contents, &ldhdr);
- strings = (char *) contents + ldhdr.l_stoff;
- symbuf = bfd_zalloc (abfd, ldhdr.l_nsyms * sizeof (* symbuf));
- if (symbuf == NULL)
- return -1;
- elsym = contents + bfd_xcoff_loader_symbol_offset(abfd, &ldhdr);
- elsymend = elsym + ldhdr.l_nsyms * bfd_xcoff_ldsymsz(abfd);
- for (; elsym < elsymend; elsym += bfd_xcoff_ldsymsz(abfd), symbuf++, psyms++)
- {
- struct internal_ldsym ldsym;
- bfd_xcoff_swap_ldsym_in (abfd, elsym, &ldsym);
- symbuf->symbol.the_bfd = abfd;
- if (ldsym._l._l_l._l_zeroes == 0)
- symbuf->symbol.name = strings + ldsym._l._l_l._l_offset;
- else
- {
- char *c;
- c = bfd_alloc (abfd, (bfd_size_type) SYMNMLEN + 1);
- if (c == NULL)
- return -1;
- memcpy (c, ldsym._l._l_name, SYMNMLEN);
- c[SYMNMLEN] = '\0';
- symbuf->symbol.name = c;
- }
- if (ldsym.l_smclas == XMC_XO)
- symbuf->symbol.section = bfd_abs_section_ptr;
- else
- symbuf->symbol.section = coff_section_from_bfd_index (abfd,
- ldsym.l_scnum);
- symbuf->symbol.value = ldsym.l_value - symbuf->symbol.section->vma;
- symbuf->symbol.flags = BSF_NO_FLAGS;
- if ((ldsym.l_smtype & L_EXPORT) != 0)
- {
- if ((ldsym.l_smtype & L_WEAK) != 0)
- symbuf->symbol.flags |= BSF_WEAK;
- else
- symbuf->symbol.flags |= BSF_GLOBAL;
- }
- /* FIXME: We have no way to record the other information stored
- with the loader symbol. */
- *psyms = (asymbol *) symbuf;
- }
- *psyms = NULL;
- return ldhdr.l_nsyms;
- }
- /* Get the size required to hold the dynamic relocs. */
- long
- _bfd_xcoff_get_dynamic_reloc_upper_bound (bfd *abfd)
- {
- asection *lsec;
- bfd_byte *contents;
- struct internal_ldhdr ldhdr;
- if ((abfd->flags & DYNAMIC) == 0)
- {
- bfd_set_error (bfd_error_invalid_operation);
- return -1;
- }
- lsec = bfd_get_section_by_name (abfd, ".loader");
- if (lsec == NULL)
- {
- bfd_set_error (bfd_error_no_symbols);
- return -1;
- }
- if (! xcoff_get_section_contents (abfd, lsec))
- return -1;
- contents = coff_section_data (abfd, lsec)->contents;
- bfd_xcoff_swap_ldhdr_in (abfd, (struct external_ldhdr *) contents, &ldhdr);
- return (ldhdr.l_nreloc + 1) * sizeof (arelent *);
- }
- /* Get the dynamic relocs. */
- long
- _bfd_xcoff_canonicalize_dynamic_reloc (bfd *abfd,
- arelent **prelocs,
- asymbol **syms)
- {
- asection *lsec;
- bfd_byte *contents;
- struct internal_ldhdr ldhdr;
- arelent *relbuf;
- bfd_byte *elrel, *elrelend;
- if ((abfd->flags & DYNAMIC) == 0)
- {
- bfd_set_error (bfd_error_invalid_operation);
- return -1;
- }
- lsec = bfd_get_section_by_name (abfd, ".loader");
- if (lsec == NULL)
- {
- bfd_set_error (bfd_error_no_symbols);
- return -1;
- }
- if (! xcoff_get_section_contents (abfd, lsec))
- return -1;
- contents = coff_section_data (abfd, lsec)->contents;
- bfd_xcoff_swap_ldhdr_in (abfd, contents, &ldhdr);
- relbuf = bfd_alloc (abfd, ldhdr.l_nreloc * sizeof (arelent));
- if (relbuf == NULL)
- return -1;
- elrel = contents + bfd_xcoff_loader_reloc_offset(abfd, &ldhdr);
- elrelend = elrel + ldhdr.l_nreloc * bfd_xcoff_ldrelsz(abfd);
- for (; elrel < elrelend; elrel += bfd_xcoff_ldrelsz(abfd), relbuf++,
- prelocs++)
- {
- struct internal_ldrel ldrel;
- bfd_xcoff_swap_ldrel_in (abfd, elrel, &ldrel);
- if (ldrel.l_symndx >= 3)
- relbuf->sym_ptr_ptr = syms + (ldrel.l_symndx - 3);
- else
- {
- const char *name;
- asection *sec;
- switch (ldrel.l_symndx)
- {
- case 0:
- name = ".text";
- break;
- case 1:
- name = ".data";
- break;
- case 2:
- name = ".bss";
- break;
- default:
- abort ();
- break;
- }
- sec = bfd_get_section_by_name (abfd, name);
- if (sec == NULL)
- {
- bfd_set_error (bfd_error_bad_value);
- return -1;
- }
- relbuf->sym_ptr_ptr = sec->symbol_ptr_ptr;
- }
- relbuf->address = ldrel.l_vaddr;
- relbuf->addend = 0;
- /* Most dynamic relocs have the same type. FIXME: This is only
- correct if ldrel.l_rtype == 0. In other cases, we should use
- a different howto. */
- relbuf->howto = bfd_xcoff_dynamic_reloc_howto(abfd);
- /* FIXME: We have no way to record the l_rsecnm field. */
- *prelocs = relbuf;
- }
- *prelocs = NULL;
- return ldhdr.l_nreloc;
- }
- /* Hash functions for xcoff_link_hash_table's archive_info. */
- static hashval_t
- xcoff_archive_info_hash (const void *data)
- {
- const struct xcoff_archive_info *info;
- info = (const struct xcoff_archive_info *) data;
- return htab_hash_pointer (info->archive);
- }
- static int
- xcoff_archive_info_eq (const void *data1, const void *data2)
- {
- const struct xcoff_archive_info *info1;
- const struct xcoff_archive_info *info2;
- info1 = (const struct xcoff_archive_info *) data1;
- info2 = (const struct xcoff_archive_info *) data2;
- return info1->archive == info2->archive;
- }
- /* Return information about archive ARCHIVE. Return NULL on error. */
- static struct xcoff_archive_info *
- xcoff_get_archive_info (struct bfd_link_info *info, bfd *archive)
- {
- struct xcoff_link_hash_table *htab;
- struct xcoff_archive_info *entryp, entry;
- void **slot;
- htab = xcoff_hash_table (info);
- entry.archive = archive;
- slot = htab_find_slot (htab->archive_info, &entry, INSERT);
- if (!slot)
- return NULL;
- entryp = *slot;
- if (!entryp)
- {
- entryp = bfd_zalloc (info->output_bfd, sizeof (entry));
- if (!entryp)
- return NULL;
- entryp->archive = archive;
- *slot = entryp;
- }
- return entryp;
- }
- /* Routine to create an entry in an XCOFF link hash table. */
- static struct bfd_hash_entry *
- xcoff_link_hash_newfunc (struct bfd_hash_entry *entry,
- struct bfd_hash_table *table,
- const char *string)
- {
- struct xcoff_link_hash_entry *ret = (struct xcoff_link_hash_entry *) entry;
- /* Allocate the structure if it has not already been allocated by a
- subclass. */
- if (ret == NULL)
- ret = bfd_hash_allocate (table, sizeof (* ret));
- if (ret == NULL)
- return NULL;
- /* Call the allocation method of the superclass. */
- ret = ((struct xcoff_link_hash_entry *)
- _bfd_link_hash_newfunc ((struct bfd_hash_entry *) ret,
- table, string));
- if (ret != NULL)
- {
- /* Set local fields. */
- ret->indx = -1;
- ret->toc_section = NULL;
- ret->u.toc_indx = -1;
- ret->descriptor = NULL;
- ret->ldsym = NULL;
- ret->ldindx = -1;
- ret->flags = 0;
- ret->smclas = XMC_UA;
- }
- return (struct bfd_hash_entry *) ret;
- }
- /* Destroy an XCOFF link hash table. */
- static void
- _bfd_xcoff_bfd_link_hash_table_free (bfd *obfd)
- {
- struct xcoff_link_hash_table *ret;
- ret = (struct xcoff_link_hash_table *) obfd->link.hash;
- if (ret->archive_info)
- htab_delete (ret->archive_info);
- if (ret->debug_strtab)
- _bfd_stringtab_free (ret->debug_strtab);
- _bfd_generic_link_hash_table_free (obfd);
- }
- /* Create an XCOFF link hash table. */
- struct bfd_link_hash_table *
- _bfd_xcoff_bfd_link_hash_table_create (bfd *abfd)
- {
- struct xcoff_link_hash_table *ret;
- bool isxcoff64 = false;
- size_t amt = sizeof (* ret);
- ret = bfd_zmalloc (amt);
- if (ret == NULL)
- return NULL;
- if (!_bfd_link_hash_table_init (&ret->root, abfd, xcoff_link_hash_newfunc,
- sizeof (struct xcoff_link_hash_entry)))
- {
- free (ret);
- return NULL;
- }
- isxcoff64 = bfd_coff_debug_string_prefix_length (abfd) == 4;
- ret->debug_strtab = _bfd_xcoff_stringtab_init (isxcoff64);
- ret->archive_info = htab_create (37, xcoff_archive_info_hash,
- xcoff_archive_info_eq, NULL);
- if (!ret->debug_strtab || !ret->archive_info)
- {
- _bfd_xcoff_bfd_link_hash_table_free (abfd);
- return NULL;
- }
- ret->root.hash_table_free = _bfd_xcoff_bfd_link_hash_table_free;
- /* The linker will always generate a full a.out header. We need to
- record that fact now, before the sizeof_headers routine could be
- called. */
- xcoff_data (abfd)->full_aouthdr = true;
- return &ret->root;
- }
- /* Read internal relocs for an XCOFF csect. This is a wrapper around
- _bfd_coff_read_internal_relocs which tries to take advantage of any
- relocs which may have been cached for the enclosing section. */
- static struct internal_reloc *
- xcoff_read_internal_relocs (bfd *abfd,
- asection *sec,
- bool cache,
- bfd_byte *external_relocs,
- bool require_internal,
- struct internal_reloc *internal_relocs)
- {
- if (coff_section_data (abfd, sec) != NULL
- && coff_section_data (abfd, sec)->relocs == NULL
- && xcoff_section_data (abfd, sec) != NULL)
- {
- asection *enclosing;
- enclosing = xcoff_section_data (abfd, sec)->enclosing;
- if (enclosing != NULL
- && (coff_section_data (abfd, enclosing) == NULL
- || coff_section_data (abfd, enclosing)->relocs == NULL)
- && cache
- && enclosing->reloc_count > 0)
- {
- if (_bfd_coff_read_internal_relocs (abfd, enclosing, true,
- external_relocs, false, NULL)
- == NULL)
- return NULL;
- }
- if (enclosing != NULL
- && coff_section_data (abfd, enclosing) != NULL
- && coff_section_data (abfd, enclosing)->relocs != NULL)
- {
- size_t off;
- off = ((sec->rel_filepos - enclosing->rel_filepos)
- / bfd_coff_relsz (abfd));
- if (! require_internal)
- return coff_section_data (abfd, enclosing)->relocs + off;
- memcpy (internal_relocs,
- coff_section_data (abfd, enclosing)->relocs + off,
- sec->reloc_count * sizeof (struct internal_reloc));
- return internal_relocs;
- }
- }
- return _bfd_coff_read_internal_relocs (abfd, sec, cache, external_relocs,
- require_internal, internal_relocs);
- }
- /* Split FILENAME into an import path and an import filename,
- storing them in *IMPPATH and *IMPFILE respectively. */
- bool
- bfd_xcoff_split_import_path (bfd *abfd, const char *filename,
- const char **imppath, const char **impfile)
- {
- const char *base;
- size_t length;
- char *path;
- base = lbasename (filename);
- length = base - filename;
- if (length == 0)
- /* The filename has no directory component, so use an empty path. */
- *imppath = "";
- else if (length == 1)
- /* The filename is in the root directory. */
- *imppath = "/";
- else
- {
- /* Extract the (non-empty) directory part. Note that we don't
- need to strip duplicate directory separators from any part
- of the string; the native linker doesn't do that either. */
- path = bfd_alloc (abfd, length);
- if (path == NULL)
- return false;
- memcpy (path, filename, length - 1);
- path[length - 1] = 0;
- *imppath = path;
- }
- *impfile = base;
- return true;
- }
- /* Set ARCHIVE's import path as though its filename had been given
- as FILENAME. */
- bool
- bfd_xcoff_set_archive_import_path (struct bfd_link_info *info,
- bfd *archive, const char *filename)
- {
- struct xcoff_archive_info *archive_info;
- archive_info = xcoff_get_archive_info (info, archive);
- return (archive_info != NULL
- && bfd_xcoff_split_import_path (archive, filename,
- &archive_info->imppath,
- &archive_info->impfile));
- }
- /* H is an imported symbol. Set the import module's path, file and member
- to IMPATH, IMPFILE and IMPMEMBER respectively. All three are null if
- no specific import module is specified. */
- static bool
- xcoff_set_import_path (struct bfd_link_info *info,
- struct xcoff_link_hash_entry *h,
- const char *imppath, const char *impfile,
- const char *impmember)
- {
- unsigned int c;
- struct xcoff_import_file **pp;
- /* We overload the ldindx field to hold the l_ifile value for this
- symbol. */
- BFD_ASSERT (h->ldsym == NULL);
- BFD_ASSERT ((h->flags & XCOFF_BUILT_LDSYM) == 0);
- if (imppath == NULL)
- h->ldindx = -1;
- else
- {
- /* We start c at 1 because the first entry in the import list is
- reserved for the library search path. */
- for (pp = &xcoff_hash_table (info)->imports, c = 1;
- *pp != NULL;
- pp = &(*pp)->next, ++c)
- {
- if (filename_cmp ((*pp)->path, imppath) == 0
- && filename_cmp ((*pp)->file, impfile) == 0
- && filename_cmp ((*pp)->member, impmember) == 0)
- break;
- }
- if (*pp == NULL)
- {
- struct xcoff_import_file *n;
- size_t amt = sizeof (*n);
- n = bfd_alloc (info->output_bfd, amt);
- if (n == NULL)
- return false;
- n->next = NULL;
- n->path = imppath;
- n->file = impfile;
- n->member = impmember;
- *pp = n;
- }
- h->ldindx = c;
- }
- return true;
- }
- /* H is the bfd symbol associated with exported .loader symbol LDSYM.
- Return true if LDSYM defines H. */
- static bool
- xcoff_dynamic_definition_p (struct xcoff_link_hash_entry *h,
- struct internal_ldsym *ldsym)
- {
- /* If we didn't know about H before processing LDSYM, LDSYM
- definitely defines H. */
- if (h->root.type == bfd_link_hash_new)
- return true;
- /* If H is currently a weak dynamic symbol, and if LDSYM is a strong
- dynamic symbol, LDSYM trumps the current definition of H. */
- if ((ldsym->l_smtype & L_WEAK) == 0
- && (h->flags & XCOFF_DEF_DYNAMIC) != 0
- && (h->flags & XCOFF_DEF_REGULAR) == 0
- && (h->root.type == bfd_link_hash_defweak
- || h->root.type == bfd_link_hash_undefweak))
- return true;
- /* If H is currently undefined, LDSYM defines it.
- However, if H has a hidden visibility, LDSYM must not
- define it. */
- if ((h->flags & XCOFF_DEF_DYNAMIC) == 0
- && (h->root.type == bfd_link_hash_undefined
- || h->root.type == bfd_link_hash_undefweak)
- && (h->visibility != SYM_V_HIDDEN
- && h->visibility != SYM_V_INTERNAL))
- return true;
- return false;
- }
- /* This function is used to add symbols from a dynamic object to the
- global symbol table. */
- static bool
- xcoff_link_add_dynamic_symbols (bfd *abfd, struct bfd_link_info *info)
- {
- asection *lsec;
- bfd_byte *contents;
- struct internal_ldhdr ldhdr;
- const char *strings;
- bfd_byte *elsym, *elsymend;
- struct xcoff_import_file *n;
- unsigned int c;
- struct xcoff_import_file **pp;
- /* We can only handle a dynamic object if we are generating an XCOFF
- output file. */
- if (info->output_bfd->xvec != abfd->xvec)
- {
- _bfd_error_handler
- (_("%pB: XCOFF shared object when not producing XCOFF output"),
- abfd);
- bfd_set_error (bfd_error_invalid_operation);
- return false;
- }
- /* The symbols we use from a dynamic object are not the symbols in
- the normal symbol table, but, rather, the symbols in the export
- table. If there is a global symbol in a dynamic object which is
- not in the export table, the loader will not be able to find it,
- so we don't want to find it either. Also, on AIX 4.1.3, shr.o in
- libc.a has symbols in the export table which are not in the
- symbol table. */
- /* Read in the .loader section. FIXME: We should really use the
- o_snloader field in the a.out header, rather than grabbing the
- section by name. */
- lsec = bfd_get_section_by_name (abfd, ".loader");
- if (lsec == NULL)
- {
- _bfd_error_handler
- (_("%pB: dynamic object with no .loader section"),
- abfd);
- bfd_set_error (bfd_error_no_symbols);
- return false;
- }
- if (! xcoff_get_section_contents (abfd, lsec))
- return false;
- contents = coff_section_data (abfd, lsec)->contents;
- /* Remove the sections from this object, so that they do not get
- included in the link. */
- bfd_section_list_clear (abfd);
- bfd_xcoff_swap_ldhdr_in (abfd, contents, &ldhdr);
- strings = (char *) contents + ldhdr.l_stoff;
- elsym = contents + bfd_xcoff_loader_symbol_offset(abfd, &ldhdr);
- elsymend = elsym + ldhdr.l_nsyms * bfd_xcoff_ldsymsz(abfd);
- for (; elsym < elsymend; elsym += bfd_xcoff_ldsymsz(abfd))
- {
- struct internal_ldsym ldsym;
- char nambuf[SYMNMLEN + 1];
- const char *name;
- struct xcoff_link_hash_entry *h;
- bfd_xcoff_swap_ldsym_in (abfd, elsym, &ldsym);
- /* We are only interested in exported symbols. */
- if ((ldsym.l_smtype & L_EXPORT) == 0)
- continue;
- if (ldsym._l._l_l._l_zeroes == 0)
- name = strings + ldsym._l._l_l._l_offset;
- else
- {
- memcpy (nambuf, ldsym._l._l_name, SYMNMLEN);
- nambuf[SYMNMLEN] = '\0';
- name = nambuf;
- }
- /* Normally we could not call xcoff_link_hash_lookup in an add
- symbols routine, since we might not be using an XCOFF hash
- table. However, we verified above that we are using an XCOFF
- hash table. */
- h = xcoff_link_hash_lookup (xcoff_hash_table (info), name, true,
- true, true);
- if (h == NULL)
- return false;
- if (!xcoff_dynamic_definition_p (h, &ldsym))
- continue;
- h->flags |= XCOFF_DEF_DYNAMIC;
- h->smclas = ldsym.l_smclas;
- if (h->smclas == XMC_XO)
- {
- /* This symbol has an absolute value. */
- if ((ldsym.l_smtype & L_WEAK) != 0)
- h->root.type = bfd_link_hash_defweak;
- else
- h->root.type = bfd_link_hash_defined;
- h->root.u.def.section = bfd_abs_section_ptr;
- h->root.u.def.value = ldsym.l_value;
- }
- else
- {
- /* Otherwise, we don't bother to actually define the symbol,
- since we don't have a section to put it in anyhow.
- We assume instead that an undefined XCOFF_DEF_DYNAMIC symbol
- should be imported from the symbol's undef.abfd. */
- if ((ldsym.l_smtype & L_WEAK) != 0)
- h->root.type = bfd_link_hash_undefweak;
- else
- h->root.type = bfd_link_hash_undefined;
- h->root.u.undef.abfd = abfd;
- }
- /* If this symbol defines a function descriptor, then it
- implicitly defines the function code as well. */
- if (h->smclas == XMC_DS
- || (h->smclas == XMC_XO && name[0] != '.'))
- h->flags |= XCOFF_DESCRIPTOR;
- if ((h->flags & XCOFF_DESCRIPTOR) != 0)
- {
- struct xcoff_link_hash_entry *hds;
- hds = h->descriptor;
- if (hds == NULL)
- {
- char *dsnm;
- dsnm = bfd_malloc ((bfd_size_type) strlen (name) + 2);
- if (dsnm == NULL)
- return false;
- dsnm[0] = '.';
- strcpy (dsnm + 1, name);
- hds = xcoff_link_hash_lookup (xcoff_hash_table (info), dsnm,
- true, true, true);
- free (dsnm);
- if (hds == NULL)
- return false;
- hds->descriptor = h;
- h->descriptor = hds;
- }
- if (xcoff_dynamic_definition_p (hds, &ldsym))
- {
- hds->root.type = h->root.type;
- hds->flags |= XCOFF_DEF_DYNAMIC;
- if (h->smclas == XMC_XO)
- {
- /* An absolute symbol appears to actually define code, not a
- function descriptor. This is how some math functions are
- implemented on AIX 4.1. */
- hds->smclas = XMC_XO;
- hds->root.u.def.section = bfd_abs_section_ptr;
- hds->root.u.def.value = ldsym.l_value;
- }
- else
- {
- hds->smclas = XMC_PR;
- hds->root.u.undef.abfd = abfd;
- /* We do not want to add this to the undefined
- symbol list. */
- }
- }
- }
- }
- if (contents != NULL && ! coff_section_data (abfd, lsec)->keep_contents)
- {
- free (coff_section_data (abfd, lsec)->contents);
- coff_section_data (abfd, lsec)->contents = NULL;
- }
- /* Record this file in the import files. */
- n = bfd_alloc (abfd, (bfd_size_type) sizeof (struct xcoff_import_file));
- if (n == NULL)
- return false;
- n->next = NULL;
- if (abfd->my_archive == NULL || bfd_is_thin_archive (abfd->my_archive))
- {
- if (!bfd_xcoff_split_import_path (abfd, bfd_get_filename (abfd),
- &n->path, &n->file))
- return false;
- n->member = "";
- }
- else
- {
- struct xcoff_archive_info *archive_info;
- archive_info = xcoff_get_archive_info (info, abfd->my_archive);
- if (!archive_info->impfile)
- {
- if (!bfd_xcoff_split_import_path (archive_info->archive,
- bfd_get_filename (archive_info
- ->archive),
- &archive_info->imppath,
- &archive_info->impfile))
- return false;
- }
- n->path = archive_info->imppath;
- n->file = archive_info->impfile;
- n->member = bfd_get_filename (abfd);
- }
- /* We start c at 1 because the first import file number is reserved
- for LIBPATH. */
- for (pp = &xcoff_hash_table (info)->imports, c = 1;
- *pp != NULL;
- pp = &(*pp)->next, ++c)
- ;
- *pp = n;
- xcoff_data (abfd)->import_file_id = c;
- return true;
- }
- /* xcoff_link_create_extra_sections
- Takes care of creating the .loader, .gl, .ds, .debug and sections. */
- static bool
- xcoff_link_create_extra_sections (bfd * abfd, struct bfd_link_info *info)
- {
- bool return_value = false;
- if (info->output_bfd->xvec == abfd->xvec)
- {
- /* We need to build a .loader section, so we do it here. This
- won't work if we're producing an XCOFF output file with no
- XCOFF input files. FIXME. */
- if (!bfd_link_relocatable (info)
- && xcoff_hash_table (info)->loader_section == NULL)
- {
- asection *lsec;
- flagword flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
- lsec = bfd_make_section_anyway_with_flags (abfd, ".loader", flags);
- if (lsec == NULL)
- goto end_return;
- xcoff_hash_table (info)->loader_section = lsec;
- }
- /* Likewise for the linkage section. */
- if (xcoff_hash_table (info)->linkage_section == NULL)
- {
- asection *lsec;
- flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
- | SEC_IN_MEMORY);
- lsec = bfd_make_section_anyway_with_flags (abfd, ".gl", flags);
- if (lsec == NULL)
- goto end_return;
- xcoff_hash_table (info)->linkage_section = lsec;
- lsec->alignment_power = 2;
- }
- /* Likewise for the TOC section. */
- if (xcoff_hash_table (info)->toc_section == NULL)
- {
- asection *tsec;
- flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
- | SEC_IN_MEMORY);
- tsec = bfd_make_section_anyway_with_flags (abfd, ".tc", flags);
- if (tsec == NULL)
- goto end_return;
- xcoff_hash_table (info)->toc_section = tsec;
- tsec->alignment_power = 2;
- }
- /* Likewise for the descriptor section. */
- if (xcoff_hash_table (info)->descriptor_section == NULL)
- {
- asection *dsec;
- flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
- | SEC_IN_MEMORY);
- dsec = bfd_make_section_anyway_with_flags (abfd, ".ds", flags);
- if (dsec == NULL)
- goto end_return;
- xcoff_hash_table (info)->descriptor_section = dsec;
- dsec->alignment_power = 2;
- }
- /* Likewise for the .debug section. */
- if (xcoff_hash_table (info)->debug_section == NULL
- && info->strip != strip_all)
- {
- asection *dsec;
- flagword flags = SEC_HAS_CONTENTS | SEC_IN_MEMORY;
- dsec = bfd_make_section_anyway_with_flags (abfd, ".debug", flags);
- if (dsec == NULL)
- goto end_return;
- xcoff_hash_table (info)->debug_section = dsec;
- }
- }
- return_value = true;
- end_return:
- return return_value;
- }
- /* Returns the index of reloc in RELOCS with the least address greater
- than or equal to ADDRESS. The relocs are sorted by address. */
- static bfd_size_type
- xcoff_find_reloc (struct internal_reloc *relocs,
- bfd_size_type count,
- bfd_vma address)
- {
- bfd_size_type min, max, this;
- if (count < 2)
- {
- if (count == 1 && relocs[0].r_vaddr < address)
- return 1;
- else
- return 0;
- }
- min = 0;
- max = count;
- /* Do a binary search over (min,max]. */
- while (min + 1 < max)
- {
- bfd_vma raddr;
- this = (max + min) / 2;
- raddr = relocs[this].r_vaddr;
- if (raddr > address)
- max = this;
- else if (raddr < address)
- min = this;
- else
- {
- min = this;
- break;
- }
- }
- if (relocs[min].r_vaddr < address)
- return min + 1;
- while (min > 0
- && relocs[min - 1].r_vaddr == address)
- --min;
- return min;
- }
- /* Return true if the symbol has to be added to the linker hash
- table. */
- static bool
- xcoff_link_add_symbols_to_hash_table (struct internal_syment sym,
- union internal_auxent aux)
- {
- /* External symbols must be added. */
- if (EXTERN_SYM_P (sym.n_sclass))
- return true;
- /* Hidden TLS symbols must be added to verify TLS relocations
- in xcoff_reloc_type_tls. */
- if (sym.n_sclass == C_HIDEXT
- && ((aux.x_csect.x_smclas == XMC_TL
- || aux.x_csect.x_smclas == XMC_UL)))
- return true;
- return false;
- }
- /* Add all the symbols from an object file to the hash table.
- XCOFF is a weird format. A normal XCOFF .o files will have three
- COFF sections--.text, .data, and .bss--but each COFF section will
- contain many csects. These csects are described in the symbol
- table. From the linker's point of view, each csect must be
- considered a section in its own right. For example, a TOC entry is
- handled as a small XMC_TC csect. The linker must be able to merge
- different TOC entries together, which means that it must be able to
- extract the XMC_TC csects from the .data section of the input .o
- file.
- From the point of view of our linker, this is, of course, a hideous
- nightmare. We cope by actually creating sections for each csect,
- and discarding the original sections. We then have to handle the
- relocation entries carefully, since the only way to tell which
- csect they belong to is to examine the address. */
- static bool
- xcoff_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
- {
- unsigned int n_tmask;
- unsigned int n_btshft;
- bool default_copy;
- bfd_size_type symcount;
- struct xcoff_link_hash_entry **sym_hash;
- asection **csect_cache;
- unsigned int *lineno_counts;
- bfd_size_type linesz;
- asection *o;
- asection *last_real;
- bool keep_syms;
- asection *csect;
- unsigned int csect_index;
- asection *first_csect;
- bfd_size_type symesz;
- bfd_byte *esym;
- bfd_byte *esym_end;
- struct reloc_info_struct
- {
- struct internal_reloc *relocs;
- asection **csects;
- bfd_byte *linenos;
- } *reloc_info = NULL;
- bfd_size_type amt;
- unsigned short visibility;
- keep_syms = obj_coff_keep_syms (abfd);
- if ((abfd->flags & DYNAMIC) != 0
- && ! info->static_link)
- {
- if (! xcoff_link_add_dynamic_symbols (abfd, info))
- return false;
- }
- /* Create the loader, toc, gl, ds and debug sections, if needed. */
- if (! xcoff_link_create_extra_sections (abfd, info))
- goto error_return;
- if ((abfd->flags & DYNAMIC) != 0
- && ! info->static_link)
- return true;
- n_tmask = coff_data (abfd)->local_n_tmask;
- n_btshft = coff_data (abfd)->local_n_btshft;
- /* Define macros so that ISFCN, et. al., macros work correctly. */
- #define N_TMASK n_tmask
- #define N_BTSHFT n_btshft
- if (info->keep_memory)
- default_copy = false;
- else
- default_copy = true;
- symcount = obj_raw_syment_count (abfd);
- /* We keep a list of the linker hash table entries that correspond
- to each external symbol. */
- amt = symcount * sizeof (struct xcoff_link_hash_entry *);
- sym_hash = bfd_zalloc (abfd, amt);
- if (sym_hash == NULL && symcount != 0)
- goto error_return;
- coff_data (abfd)->sym_hashes = (struct coff_link_hash_entry **) sym_hash;
- /* Because of the weird stuff we are doing with XCOFF csects, we can
- not easily determine which section a symbol is in, so we store
- the information in the tdata for the input file. */
- amt = symcount * sizeof (asection *);
- csect_cache = bfd_zalloc (abfd, amt);
- if (csect_cache == NULL && symcount != 0)
- goto error_return;
- xcoff_data (abfd)->csects = csect_cache;
- /* We garbage-collect line-number information on a symbol-by-symbol
- basis, so we need to have quick access to the number of entries
- per symbol. */
- amt = symcount * sizeof (unsigned int);
- lineno_counts = bfd_zalloc (abfd, amt);
- if (lineno_counts == NULL && symcount != 0)
- goto error_return;
- xcoff_data (abfd)->lineno_counts = lineno_counts;
- /* While splitting sections into csects, we need to assign the
- relocs correctly. The relocs and the csects must both be in
- order by VMA within a given section, so we handle this by
- scanning along the relocs as we process the csects. We index
- into reloc_info using the section target_index. */
- amt = abfd->section_count + 1;
- amt *= sizeof (struct reloc_info_struct);
- reloc_info = bfd_zmalloc (amt);
- if (reloc_info == NULL)
- goto error_return;
- /* Read in the relocs and line numbers for each section. */
- linesz = bfd_coff_linesz (abfd);
- last_real = NULL;
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- last_real = o;
- if ((o->flags & SEC_RELOC) != 0)
- {
- reloc_info[o->target_index].relocs =
- xcoff_read_internal_relocs (abfd, o, true, NULL, false, NULL);
- amt = o->reloc_count;
- amt *= sizeof (asection *);
- reloc_info[o->target_index].csects = bfd_zmalloc (amt);
- if (reloc_info[o->target_index].csects == NULL)
- goto error_return;
- }
- if ((info->strip == strip_none || info->strip == strip_some)
- && o->lineno_count > 0)
- {
- bfd_byte *linenos;
- if (bfd_seek (abfd, o->line_filepos, SEEK_SET) != 0)
- goto error_return;
- if (_bfd_mul_overflow (linesz, o->lineno_count, &amt))
- {
- bfd_set_error (bfd_error_file_too_big);
- goto error_return;
- }
- linenos = _bfd_malloc_and_read (abfd, amt, amt);
- if (linenos == NULL)
- goto error_return;
- reloc_info[o->target_index].linenos = linenos;
- }
- }
- /* Don't let the linker relocation routines discard the symbols. */
- obj_coff_keep_syms (abfd) = true;
- csect = NULL;
- csect_index = 0;
- first_csect = NULL;
- symesz = bfd_coff_symesz (abfd);
- BFD_ASSERT (symesz == bfd_coff_auxesz (abfd));
- esym = (bfd_byte *) obj_coff_external_syms (abfd);
- esym_end = esym + symcount * symesz;
- while (esym < esym_end)
- {
- struct internal_syment sym;
- union internal_auxent aux;
- const char *name;
- char buf[SYMNMLEN + 1];
- int smtyp;
- asection *section;
- bfd_vma value;
- struct xcoff_link_hash_entry *set_toc;
- bfd_coff_swap_sym_in (abfd, (void *) esym, (void *) &sym);
- /* In this pass we are only interested in symbols with csect
- information. */
- if (!CSECT_SYM_P (sym.n_sclass))
- {
- /* Set csect_cache,
- Normally csect is a .pr, .rw etc. created in the loop
- If C_FILE or first time, handle special
- Advance esym, sym_hash, csect_hash ptrs. */
- if (sym.n_sclass == C_FILE || sym.n_sclass == C_DWARF)
- csect = NULL;
- if (csect != NULL)
- *csect_cache = csect;
- else if (first_csect == NULL
- || sym.n_sclass == C_FILE || sym.n_sclass == C_DWARF)
- *csect_cache = coff_section_from_bfd_index (abfd, sym.n_scnum);
- else
- *csect_cache = NULL;
- esym += (sym.n_numaux + 1) * symesz;
- sym_hash += sym.n_numaux + 1;
- csect_cache += sym.n_numaux + 1;
- lineno_counts += sym.n_numaux + 1;
- continue;
- }
- name = _bfd_coff_internal_syment_name (abfd, &sym, buf);
- if (name == NULL)
- goto error_return;
- /* If this symbol has line number information attached to it,
- and we're not stripping it, count the number of entries and
- add them to the count for this csect. In the final link pass
- we are going to attach line number information by symbol,
- rather than by section, in order to more easily handle
- garbage collection. */
- if ((info->strip == strip_none || info->strip == strip_some)
- && sym.n_numaux > 1
- && csect != NULL
- && ISFCN (sym.n_type))
- {
- union internal_auxent auxlin;
- bfd_coff_swap_aux_in (abfd, (void *) (esym + symesz),
- sym.n_type, sym.n_sclass,
- 0, sym.n_numaux, (void *) &auxlin);
- if (auxlin.x_sym.x_fcnary.x_fcn.x_lnnoptr != 0)
- {
- asection *enclosing;
- bfd_signed_vma linoff;
- enclosing = xcoff_section_data (abfd, csect)->enclosing;
- if (enclosing == NULL)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: `%s' has line numbers but no enclosing section"),
- abfd, name);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- linoff = (auxlin.x_sym.x_fcnary.x_fcn.x_lnnoptr
- - enclosing->line_filepos);
- /* Explicit cast to bfd_signed_vma for compiler. */
- if (linoff < (bfd_signed_vma) (enclosing->lineno_count * linesz))
- {
- struct internal_lineno lin;
- bfd_byte *linpstart;
- linpstart = (reloc_info[enclosing->target_index].linenos
- + linoff);
- bfd_coff_swap_lineno_in (abfd, (void *) linpstart, (void *) &lin);
- if (lin.l_lnno == 0
- && ((bfd_size_type) lin.l_addr.l_symndx
- == ((esym
- - (bfd_byte *) obj_coff_external_syms (abfd))
- / symesz)))
- {
- bfd_byte *linpend, *linp;
- linpend = (reloc_info[enclosing->target_index].linenos
- + enclosing->lineno_count * linesz);
- for (linp = linpstart + linesz;
- linp < linpend;
- linp += linesz)
- {
- bfd_coff_swap_lineno_in (abfd, (void *) linp,
- (void *) &lin);
- if (lin.l_lnno == 0)
- break;
- }
- *lineno_counts = (linp - linpstart) / linesz;
- /* The setting of line_filepos will only be
- useful if all the line number entries for a
- csect are contiguous; this only matters for
- error reporting. */
- if (csect->line_filepos == 0)
- csect->line_filepos =
- auxlin.x_sym.x_fcnary.x_fcn.x_lnnoptr;
- }
- }
- }
- }
- /* Record visibility. */
- visibility = sym.n_type & SYM_V_MASK;
- /* Pick up the csect auxiliary information. */
- if (sym.n_numaux == 0)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: class %d symbol `%s' has no aux entries"),
- abfd, sym.n_sclass, name);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- bfd_coff_swap_aux_in (abfd,
- (void *) (esym + symesz * sym.n_numaux),
- sym.n_type, sym.n_sclass,
- sym.n_numaux - 1, sym.n_numaux,
- (void *) &aux);
- smtyp = SMTYP_SMTYP (aux.x_csect.x_smtyp);
- section = NULL;
- value = 0;
- set_toc = NULL;
- switch (smtyp)
- {
- default:
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: symbol `%s' has unrecognized csect type %d"),
- abfd, name, smtyp);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- case XTY_ER:
- /* This is an external reference. */
- if (sym.n_sclass == C_HIDEXT
- || sym.n_scnum != N_UNDEF
- || aux.x_csect.x_scnlen.l != 0)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: bad XTY_ER symbol `%s': class %d scnum %d "
- "scnlen %" PRId64),
- abfd, name, sym.n_sclass, sym.n_scnum,
- (int64_t) aux.x_csect.x_scnlen.l);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- /* An XMC_XO external reference is actually a reference to
- an absolute location. */
- if (aux.x_csect.x_smclas != XMC_XO)
- section = bfd_und_section_ptr;
- else
- {
- section = bfd_abs_section_ptr;
- value = sym.n_value;
- }
- break;
- case XTY_SD:
- csect = NULL;
- csect_index = -(unsigned) 1;
- /* When we see a TOC anchor, we record the TOC value. */
- if (aux.x_csect.x_smclas == XMC_TC0)
- {
- if (sym.n_sclass != C_HIDEXT
- || aux.x_csect.x_scnlen.l != 0)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: XMC_TC0 symbol `%s' is class %d scnlen %" PRId64),
- abfd, name, sym.n_sclass, (int64_t) aux.x_csect.x_scnlen.l);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- xcoff_data (abfd)->toc = sym.n_value;
- }
- /* We must merge TOC entries for the same symbol. We can
- merge two TOC entries if they are both C_HIDEXT, they
- both have the same name, they are both 4 or 8 bytes long, and
- they both have a relocation table entry for an external
- symbol with the same name. Unfortunately, this means
- that we must look through the relocations. Ick.
- Logic for 32 bit vs 64 bit.
- 32 bit has a csect length of 4 for TOC
- 64 bit has a csect length of 8 for TOC
- An exception is made for TOC entries with a R_TLSML
- relocation. This relocation is made for the loader.
- We must check that the referenced symbol is the TOC entry
- itself.
- The conditions to get past the if-check are not that bad.
- They are what is used to create the TOC csects in the first
- place. */
- if (aux.x_csect.x_smclas == XMC_TC
- && sym.n_sclass == C_HIDEXT
- && info->output_bfd->xvec == abfd->xvec
- && ((bfd_xcoff_is_xcoff32 (abfd)
- && aux.x_csect.x_scnlen.l == 4)
- || (bfd_xcoff_is_xcoff64 (abfd)
- && aux.x_csect.x_scnlen.l == 8)))
- {
- asection *enclosing;
- struct internal_reloc *relocs;
- bfd_size_type relindx;
- struct internal_reloc *rel;
- enclosing = coff_section_from_bfd_index (abfd, sym.n_scnum);
- if (enclosing == NULL)
- goto error_return;
- relocs = reloc_info[enclosing->target_index].relocs;
- amt = enclosing->reloc_count;
- relindx = xcoff_find_reloc (relocs, amt, sym.n_value);
- rel = relocs + relindx;
- /* 32 bit R_POS r_size is 31
- 64 bit R_POS r_size is 63 */
- if (relindx < enclosing->reloc_count
- && rel->r_vaddr == (bfd_vma) sym.n_value
- && (rel->r_type == R_POS ||
- rel->r_type == R_TLSML)
- && ((bfd_xcoff_is_xcoff32 (abfd)
- && rel->r_size == 31)
- || (bfd_xcoff_is_xcoff64 (abfd)
- && rel->r_size == 63)))
- {
- bfd_byte *erelsym;
- struct internal_syment relsym;
- erelsym = ((bfd_byte *) obj_coff_external_syms (abfd)
- + rel->r_symndx * symesz);
- bfd_coff_swap_sym_in (abfd, (void *) erelsym, (void *) &relsym);
- if (EXTERN_SYM_P (relsym.n_sclass))
- {
- const char *relname;
- char relbuf[SYMNMLEN + 1];
- bool copy;
- struct xcoff_link_hash_entry *h;
- /* At this point we know that the TOC entry is
- for an externally visible symbol. */
- relname = _bfd_coff_internal_syment_name (abfd, &relsym,
- relbuf);
- if (relname == NULL)
- goto error_return;
- /* We only merge TOC entries if the TC name is
- the same as the symbol name. This handles
- the normal case, but not common cases like
- SYM.P4 which gcc generates to store SYM + 4
- in the TOC. FIXME. */
- if (strcmp (name, relname) == 0)
- {
- copy = (! info->keep_memory
- || relsym._n._n_n._n_zeroes != 0
- || relsym._n._n_n._n_offset == 0);
- h = xcoff_link_hash_lookup (xcoff_hash_table (info),
- relname, true, copy,
- false);
- if (h == NULL)
- goto error_return;
- /* At this point h->root.type could be
- bfd_link_hash_new. That should be OK,
- since we know for sure that we will come
- across this symbol as we step through the
- file. */
- /* We store h in *sym_hash for the
- convenience of the relocate_section
- function. */
- *sym_hash = h;
- if (h->toc_section != NULL)
- {
- asection **rel_csects;
- /* We already have a TOC entry for this
- symbol, so we can just ignore this
- one. */
- rel_csects =
- reloc_info[enclosing->target_index].csects;
- rel_csects[relindx] = bfd_und_section_ptr;
- break;
- }
- /* We are about to create a TOC entry for
- this symbol. */
- set_toc = h;
- }
- }
- else if (rel->r_type == R_TLSML)
- {
- csect_index = ((esym
- - (bfd_byte *) obj_coff_external_syms (abfd))
- / symesz);
- if (((unsigned long) rel->r_symndx) != csect_index)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: TOC entry `%s' has a R_TLSML"
- "relocation not targeting itself"),
- abfd, name);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- }
- }
- }
- {
- asection *enclosing;
- /* We need to create a new section. We get the name from
- the csect storage mapping class, so that the linker can
- accumulate similar csects together. */
- csect = bfd_xcoff_create_csect_from_smclas(abfd, &aux, name);
- if (NULL == csect)
- goto error_return;
- /* The enclosing section is the main section : .data, .text
- or .bss that the csect is coming from. */
- enclosing = coff_section_from_bfd_index (abfd, sym.n_scnum);
- if (enclosing == NULL)
- goto error_return;
- if (! bfd_is_abs_section (enclosing)
- && ((bfd_vma) sym.n_value < enclosing->vma
- || ((bfd_vma) sym.n_value + aux.x_csect.x_scnlen.l
- > enclosing->vma + enclosing->size)))
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: csect `%s' not in enclosing section"),
- abfd, name);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- csect->vma = sym.n_value;
- csect->filepos = (enclosing->filepos
- + sym.n_value
- - enclosing->vma);
- csect->size = aux.x_csect.x_scnlen.l;
- csect->flags |= SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
- csect->alignment_power = SMTYP_ALIGN (aux.x_csect.x_smtyp);
- /* Record the enclosing section in the tdata for this new
- section. */
- amt = sizeof (struct coff_section_tdata);
- csect->used_by_bfd = bfd_zalloc (abfd, amt);
- if (csect->used_by_bfd == NULL)
- goto error_return;
- amt = sizeof (struct xcoff_section_tdata);
- coff_section_data (abfd, csect)->tdata = bfd_zalloc (abfd, amt);
- if (coff_section_data (abfd, csect)->tdata == NULL)
- goto error_return;
- xcoff_section_data (abfd, csect)->enclosing = enclosing;
- xcoff_section_data (abfd, csect)->lineno_count =
- enclosing->lineno_count;
- if (enclosing->owner == abfd)
- {
- struct internal_reloc *relocs;
- bfd_size_type relindx;
- struct internal_reloc *rel;
- asection **rel_csect;
- relocs = reloc_info[enclosing->target_index].relocs;
- amt = enclosing->reloc_count;
- relindx = xcoff_find_reloc (relocs, amt, csect->vma);
- rel = relocs + relindx;
- rel_csect = (reloc_info[enclosing->target_index].csects
- + relindx);
- csect->rel_filepos = (enclosing->rel_filepos
- + relindx * bfd_coff_relsz (abfd));
- while (relindx < enclosing->reloc_count
- && *rel_csect == NULL
- && rel->r_vaddr < csect->vma + csect->size)
- {
- *rel_csect = csect;
- csect->flags |= SEC_RELOC;
- ++csect->reloc_count;
- ++relindx;
- ++rel;
- ++rel_csect;
- }
- }
- /* There are a number of other fields and section flags
- which we do not bother to set. */
- csect_index = ((esym
- - (bfd_byte *) obj_coff_external_syms (abfd))
- / symesz);
- xcoff_section_data (abfd, csect)->first_symndx = csect_index;
- if (first_csect == NULL)
- first_csect = csect;
- /* If this symbol must be added to the linker hash table,
- we treat it as starting at the beginning of the newly
- created section. */
- if (xcoff_link_add_symbols_to_hash_table (sym, aux))
- {
- section = csect;
- value = 0;
- }
- /* If this is a TOC section for a symbol, record it. */
- if (set_toc != NULL)
- set_toc->toc_section = csect;
- }
- break;
- case XTY_LD:
- /* This is a label definition. The x_scnlen field is the
- symbol index of the csect. Usually the XTY_LD symbol will
- follow its appropriate XTY_SD symbol. The .set pseudo op can
- cause the XTY_LD to not follow the XTY_SD symbol. */
- {
- bool bad;
- bad = false;
- if (aux.x_csect.x_scnlen.l < 0
- || (aux.x_csect.x_scnlen.l
- >= esym - (bfd_byte *) obj_coff_external_syms (abfd)))
- bad = true;
- if (! bad)
- {
- section = xcoff_data (abfd)->csects[aux.x_csect.x_scnlen.l];
- if (section == NULL
- || (section->flags & SEC_HAS_CONTENTS) == 0)
- bad = true;
- }
- if (bad)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: misplaced XTY_LD `%s'"),
- abfd, name);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- csect = section;
- value = sym.n_value - csect->vma;
- }
- break;
- case XTY_CM:
- /* This is an unitialized csect. We could base the name on
- the storage mapping class, but we don't bother except for
- an XMC_TD symbol. If this csect is externally visible,
- it is a common symbol. We put XMC_TD symbols in sections
- named .tocbss, and rely on the linker script to put that
- in the TOC area. */
- if (aux.x_csect.x_smclas == XMC_TD)
- {
- /* The linker script puts the .td section in the data
- section after the .tc section. */
- csect = bfd_make_section_anyway_with_flags (abfd, ".td",
- SEC_ALLOC);
- }
- else if (aux.x_csect.x_smclas == XMC_UL)
- {
- /* This is a thread-local unitialized csect. */
- csect = bfd_make_section_anyway_with_flags (abfd, ".tbss",
- SEC_ALLOC | SEC_THREAD_LOCAL);
- }
- else
- csect = bfd_make_section_anyway_with_flags (abfd, ".bss",
- SEC_ALLOC);
- if (csect == NULL)
- goto error_return;
- csect->vma = sym.n_value;
- csect->size = aux.x_csect.x_scnlen.l;
- csect->alignment_power = SMTYP_ALIGN (aux.x_csect.x_smtyp);
- /* There are a number of other fields and section flags
- which we do not bother to set. */
- csect_index = ((esym
- - (bfd_byte *) obj_coff_external_syms (abfd))
- / symesz);
- amt = sizeof (struct coff_section_tdata);
- csect->used_by_bfd = bfd_zalloc (abfd, amt);
- if (csect->used_by_bfd == NULL)
- goto error_return;
- amt = sizeof (struct xcoff_section_tdata);
- coff_section_data (abfd, csect)->tdata = bfd_zalloc (abfd, amt);
- if (coff_section_data (abfd, csect)->tdata == NULL)
- goto error_return;
- xcoff_section_data (abfd, csect)->first_symndx = csect_index;
- if (first_csect == NULL)
- first_csect = csect;
- if (xcoff_link_add_symbols_to_hash_table (sym, aux))
- {
- csect->flags |= SEC_IS_COMMON;
- csect->size = 0;
- section = csect;
- value = aux.x_csect.x_scnlen.l;
- }
- break;
- }
- /* Check for magic symbol names. */
- if ((smtyp == XTY_SD || smtyp == XTY_CM)
- && aux.x_csect.x_smclas != XMC_TC
- && aux.x_csect.x_smclas != XMC_TD)
- {
- int i = -1;
- if (name[0] == '_')
- {
- if (strcmp (name, "_text") == 0)
- i = XCOFF_SPECIAL_SECTION_TEXT;
- else if (strcmp (name, "_etext") == 0)
- i = XCOFF_SPECIAL_SECTION_ETEXT;
- else if (strcmp (name, "_data") == 0)
- i = XCOFF_SPECIAL_SECTION_DATA;
- else if (strcmp (name, "_edata") == 0)
- i = XCOFF_SPECIAL_SECTION_EDATA;
- else if (strcmp (name, "_end") == 0)
- i = XCOFF_SPECIAL_SECTION_END;
- }
- else if (name[0] == 'e' && strcmp (name, "end") == 0)
- i = XCOFF_SPECIAL_SECTION_END2;
- if (i != -1)
- xcoff_hash_table (info)->special_sections[i] = csect;
- }
- /* Now we have enough information to add the symbol to the
- linker hash table. */
- if (xcoff_link_add_symbols_to_hash_table (sym, aux))
- {
- bool copy, ok;
- flagword flags;
- BFD_ASSERT (section != NULL);
- /* We must copy the name into memory if we got it from the
- syment itself, rather than the string table. */
- copy = default_copy;
- if (sym._n._n_n._n_zeroes != 0
- || sym._n._n_n._n_offset == 0)
- copy = true;
- /* Ignore global linkage code when linking statically. */
- if (info->static_link
- && (smtyp == XTY_SD || smtyp == XTY_LD)
- && aux.x_csect.x_smclas == XMC_GL)
- {
- section = bfd_und_section_ptr;
- value = 0;
- }
- /* The AIX linker appears to only detect multiple symbol
- definitions when there is a reference to the symbol. If
- a symbol is defined multiple times, and the only
- references are from the same object file, the AIX linker
- appears to permit it. It does not merge the different
- definitions, but handles them independently. On the
- other hand, if there is a reference, the linker reports
- an error.
- This matters because the AIX <net/net_globals.h> header
- file actually defines an initialized array, so we have to
- actually permit that to work.
- Just to make matters even more confusing, the AIX linker
- appears to permit multiple symbol definitions whenever
- the second definition is in an archive rather than an
- object file. This may be a consequence of the manner in
- which it handles archives: I think it may load the entire
- archive in as separate csects, and then let garbage
- collection discard symbols.
- We also have to handle the case of statically linking a
- shared object, which will cause symbol redefinitions,
- although this is an easier case to detect. */
- else if (info->output_bfd->xvec == abfd->xvec)
- {
- if (! bfd_is_und_section (section))
- *sym_hash = xcoff_link_hash_lookup (xcoff_hash_table (info),
- name, true, copy, false);
- else
- /* Make a copy of the symbol name to prevent problems with
- merging symbols. */
- *sym_hash = ((struct xcoff_link_hash_entry *)
- bfd_wrapped_link_hash_lookup (abfd, info, name,
- true, true, false));
- if (*sym_hash == NULL)
- goto error_return;
- if (((*sym_hash)->root.type == bfd_link_hash_defined
- || (*sym_hash)->root.type == bfd_link_hash_defweak)
- && ! bfd_is_und_section (section)
- && ! bfd_is_com_section (section))
- {
- /* This is a second definition of a defined symbol. */
- if (((*sym_hash)->flags & XCOFF_DEF_REGULAR) == 0
- && ((*sym_hash)->flags & XCOFF_DEF_DYNAMIC) != 0)
- {
- /* The existing symbol is from a shared library.
- Replace it. */
- (*sym_hash)->root.type = bfd_link_hash_undefined;
- (*sym_hash)->root.u.undef.abfd =
- (*sym_hash)->root.u.def.section->owner;
- }
- else if (abfd->my_archive != NULL)
- {
- /* This is a redefinition in an object contained
- in an archive. Just ignore it. See the
- comment above. */
- section = bfd_und_section_ptr;
- value = 0;
- }
- else if (sym.n_sclass == C_AIX_WEAKEXT
- || (*sym_hash)->root.type == bfd_link_hash_defweak)
- {
- /* At least one of the definitions is weak.
- Allow the normal rules to take effect. */
- }
- else if ((*sym_hash)->root.u.undef.next != NULL
- || info->hash->undefs_tail == &(*sym_hash)->root)
- {
- /* This symbol has been referenced. In this
- case, we just continue and permit the
- multiple definition error. See the comment
- above about the behaviour of the AIX linker. */
- }
- else if ((*sym_hash)->smclas == aux.x_csect.x_smclas)
- {
- /* The symbols are both csects of the same
- class. There is at least a chance that this
- is a semi-legitimate redefinition. */
- section = bfd_und_section_ptr;
- value = 0;
- (*sym_hash)->flags |= XCOFF_MULTIPLY_DEFINED;
- }
- }
- else if (((*sym_hash)->flags & XCOFF_MULTIPLY_DEFINED) != 0
- && (*sym_hash)->root.type == bfd_link_hash_defined
- && (bfd_is_und_section (section)
- || bfd_is_com_section (section)))
- {
- /* This is a reference to a multiply defined symbol.
- Report the error now. See the comment above
- about the behaviour of the AIX linker. We could
- also do this with warning symbols, but I'm not
- sure the XCOFF linker is wholly prepared to
- handle them, and that would only be a warning,
- not an error. */
- (*info->callbacks->multiple_definition) (info,
- &(*sym_hash)->root,
- NULL, NULL,
- (bfd_vma) 0);
- /* Try not to give this error too many times. */
- (*sym_hash)->flags &= ~XCOFF_MULTIPLY_DEFINED;
- }
- /* If the symbol is hidden or internal, completely undo
- any dynamic link state. */
- if ((*sym_hash)->flags & XCOFF_DEF_DYNAMIC
- && (visibility == SYM_V_HIDDEN
- || visibility == SYM_V_INTERNAL))
- (*sym_hash)->flags &= ~XCOFF_DEF_DYNAMIC;
- else
- {
- /* Keep the most constraining visibility. */
- unsigned short hvis = (*sym_hash)->visibility;
- if (visibility && ( !hvis || visibility < hvis))
- (*sym_hash)->visibility = visibility;
- }
- }
- /* _bfd_generic_link_add_one_symbol may call the linker to
- generate an error message, and the linker may try to read
- the symbol table to give a good error. Right now, the
- line numbers are in an inconsistent state, since they are
- counted both in the real sections and in the new csects.
- We need to leave the count in the real sections so that
- the linker can report the line number of the error
- correctly, so temporarily clobber the link to the csects
- so that the linker will not try to read the line numbers
- a second time from the csects. */
- BFD_ASSERT (last_real->next == first_csect);
- last_real->next = NULL;
- flags = (sym.n_sclass == C_EXT ? BSF_GLOBAL : BSF_WEAK);
- ok = (_bfd_generic_link_add_one_symbol
- (info, abfd, name, flags, section, value, NULL, copy, true,
- (struct bfd_link_hash_entry **) sym_hash));
- last_real->next = first_csect;
- if (!ok)
- goto error_return;
- if (smtyp == XTY_CM)
- {
- if ((*sym_hash)->root.type != bfd_link_hash_common
- || (*sym_hash)->root.u.c.p->section != csect)
- /* We don't need the common csect we just created. */
- csect->size = 0;
- else
- (*sym_hash)->root.u.c.p->alignment_power
- = csect->alignment_power;
- }
- if (info->output_bfd->xvec == abfd->xvec)
- {
- int flag;
- if (smtyp == XTY_ER
- || smtyp == XTY_CM
- || section == bfd_und_section_ptr)
- flag = XCOFF_REF_REGULAR;
- else
- flag = XCOFF_DEF_REGULAR;
- (*sym_hash)->flags |= flag;
- if ((*sym_hash)->smclas == XMC_UA
- || flag == XCOFF_DEF_REGULAR)
- (*sym_hash)->smclas = aux.x_csect.x_smclas;
- }
- }
- if (smtyp == XTY_ER)
- *csect_cache = section;
- else
- {
- *csect_cache = csect;
- if (csect != NULL)
- xcoff_section_data (abfd, csect)->last_symndx
- = (esym - (bfd_byte *) obj_coff_external_syms (abfd)) / symesz;
- }
- esym += (sym.n_numaux + 1) * symesz;
- sym_hash += sym.n_numaux + 1;
- csect_cache += sym.n_numaux + 1;
- lineno_counts += sym.n_numaux + 1;
- }
- BFD_ASSERT (last_real == NULL || last_real->next == first_csect);
- /* Make sure that we have seen all the relocs. */
- for (o = abfd->sections; o != first_csect; o = o->next)
- {
- /* Debugging sections have no csects. */
- if (bfd_section_flags (o) & SEC_DEBUGGING)
- continue;
- /* Reset the section size and the line number count, since the
- data is now attached to the csects. Don't reset the size of
- the .debug section, since we need to read it below in
- bfd_xcoff_size_dynamic_sections. */
- if (strcmp (bfd_section_name (o), ".debug") != 0)
- o->size = 0;
- o->lineno_count = 0;
- if ((o->flags & SEC_RELOC) != 0)
- {
- bfd_size_type i;
- struct internal_reloc *rel;
- asection **rel_csect;
- rel = reloc_info[o->target_index].relocs;
- rel_csect = reloc_info[o->target_index].csects;
- for (i = 0; i < o->reloc_count; i++, rel++, rel_csect++)
- {
- if (*rel_csect == NULL)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: reloc %s:%" PRId64 " not in csect"),
- abfd, o->name, (int64_t) i);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- /* We identify all function symbols that are the target
- of a relocation, so that we can create glue code for
- functions imported from dynamic objects. */
- if (info->output_bfd->xvec == abfd->xvec
- && *rel_csect != bfd_und_section_ptr
- && obj_xcoff_sym_hashes (abfd)[rel->r_symndx] != NULL)
- {
- struct xcoff_link_hash_entry *h;
- h = obj_xcoff_sym_hashes (abfd)[rel->r_symndx];
- /* If the symbol name starts with a period, it is
- the code of a function. If the symbol is
- currently undefined, then add an undefined symbol
- for the function descriptor. This should do no
- harm, because any regular object that defines the
- function should also define the function
- descriptor. It helps, because it means that we
- will identify the function descriptor with a
- dynamic object if a dynamic object defines it. */
- if (h->root.root.string[0] == '.'
- && h->descriptor == NULL)
- {
- struct xcoff_link_hash_entry *hds;
- struct bfd_link_hash_entry *bh;
- hds = xcoff_link_hash_lookup (xcoff_hash_table (info),
- h->root.root.string + 1,
- true, false, true);
- if (hds == NULL)
- goto error_return;
- if (hds->root.type == bfd_link_hash_new)
- {
- bh = &hds->root;
- if (! (_bfd_generic_link_add_one_symbol
- (info, abfd, hds->root.root.string,
- (flagword) 0, bfd_und_section_ptr,
- (bfd_vma) 0, NULL, false,
- true, &bh)))
- goto error_return;
- hds = (struct xcoff_link_hash_entry *) bh;
- }
- hds->flags |= XCOFF_DESCRIPTOR;
- BFD_ASSERT ((h->flags & XCOFF_DESCRIPTOR) == 0);
- hds->descriptor = h;
- h->descriptor = hds;
- }
- if (h->root.root.string[0] == '.')
- h->flags |= XCOFF_CALLED;
- }
- }
- free (reloc_info[o->target_index].csects);
- reloc_info[o->target_index].csects = NULL;
- /* Reset SEC_RELOC and the reloc_count, since the reloc
- information is now attached to the csects. */
- o->flags &=~ SEC_RELOC;
- o->reloc_count = 0;
- /* If we are not keeping memory, free the reloc information. */
- if (! info->keep_memory
- && coff_section_data (abfd, o) != NULL
- && ! coff_section_data (abfd, o)->keep_relocs)
- {
- free (coff_section_data (abfd, o)->relocs);
- coff_section_data (abfd, o)->relocs = NULL;
- }
- }
- /* Free up the line numbers. FIXME: We could cache these
- somewhere for the final link, to avoid reading them again. */
- free (reloc_info[o->target_index].linenos);
- reloc_info[o->target_index].linenos = NULL;
- }
- free (reloc_info);
- obj_coff_keep_syms (abfd) = keep_syms;
- return true;
- error_return:
- if (reloc_info != NULL)
- {
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- free (reloc_info[o->target_index].csects);
- free (reloc_info[o->target_index].linenos);
- }
- free (reloc_info);
- }
- obj_coff_keep_syms (abfd) = keep_syms;
- return false;
- }
- #undef N_TMASK
- #undef N_BTSHFT
- /* Add symbols from an XCOFF object file. */
- static bool
- xcoff_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
- {
- if (! _bfd_coff_get_external_symbols (abfd))
- return false;
- if (! xcoff_link_add_symbols (abfd, info))
- return false;
- if (! info->keep_memory)
- {
- if (! _bfd_coff_free_symbols (abfd))
- return false;
- }
- return true;
- }
- /* Look through the loader symbols to see if this dynamic object
- should be included in the link. The native linker uses the loader
- symbols, not the normal symbol table, so we do too. */
- static bool
- xcoff_link_check_dynamic_ar_symbols (bfd *abfd,
- struct bfd_link_info *info,
- bool *pneeded,
- bfd **subsbfd)
- {
- asection *lsec;
- bfd_byte *contents;
- struct internal_ldhdr ldhdr;
- const char *strings;
- bfd_byte *elsym, *elsymend;
- *pneeded = false;
- lsec = bfd_get_section_by_name (abfd, ".loader");
- if (lsec == NULL)
- /* There are no symbols, so don't try to include it. */
- return true;
- if (! xcoff_get_section_contents (abfd, lsec))
- return false;
- contents = coff_section_data (abfd, lsec)->contents;
- bfd_xcoff_swap_ldhdr_in (abfd, contents, &ldhdr);
- strings = (char *) contents + ldhdr.l_stoff;
- elsym = contents + bfd_xcoff_loader_symbol_offset (abfd, &ldhdr);
- elsymend = elsym + ldhdr.l_nsyms * bfd_xcoff_ldsymsz (abfd);
- for (; elsym < elsymend; elsym += bfd_xcoff_ldsymsz (abfd))
- {
- struct internal_ldsym ldsym;
- char nambuf[SYMNMLEN + 1];
- const char *name;
- struct bfd_link_hash_entry *h;
- bfd_xcoff_swap_ldsym_in (abfd, elsym, &ldsym);
- /* We are only interested in exported symbols. */
- if ((ldsym.l_smtype & L_EXPORT) == 0)
- continue;
- if (ldsym._l._l_l._l_zeroes == 0)
- name = strings + ldsym._l._l_l._l_offset;
- else
- {
- memcpy (nambuf, ldsym._l._l_name, SYMNMLEN);
- nambuf[SYMNMLEN] = '\0';
- name = nambuf;
- }
- h = bfd_link_hash_lookup (info->hash, name, false, false, true);
- /* We are only interested in symbols that are currently
- undefined. At this point we know that we are using an XCOFF
- hash table. */
- if (h != NULL
- && h->type == bfd_link_hash_undefined
- && (((struct xcoff_link_hash_entry *) h)->flags
- & XCOFF_DEF_DYNAMIC) == 0)
- {
- if (!(*info->callbacks
- ->add_archive_element) (info, abfd, name, subsbfd))
- continue;
- *pneeded = true;
- return true;
- }
- }
- /* We do not need this shared object. */
- if (contents != NULL && ! coff_section_data (abfd, lsec)->keep_contents)
- {
- free (coff_section_data (abfd, lsec)->contents);
- coff_section_data (abfd, lsec)->contents = NULL;
- }
- return true;
- }
- /* Look through the symbols to see if this object file should be
- included in the link. */
- static bool
- xcoff_link_check_ar_symbols (bfd *abfd,
- struct bfd_link_info *info,
- bool *pneeded,
- bfd **subsbfd)
- {
- bfd_size_type symesz;
- bfd_byte *esym;
- bfd_byte *esym_end;
- *pneeded = false;
- if ((abfd->flags & DYNAMIC) != 0
- && ! info->static_link
- && info->output_bfd->xvec == abfd->xvec)
- return xcoff_link_check_dynamic_ar_symbols (abfd, info, pneeded, subsbfd);
- symesz = bfd_coff_symesz (abfd);
- esym = (bfd_byte *) obj_coff_external_syms (abfd);
- esym_end = esym + obj_raw_syment_count (abfd) * symesz;
- while (esym < esym_end)
- {
- struct internal_syment sym;
- bfd_coff_swap_sym_in (abfd, (void *) esym, (void *) &sym);
- esym += (sym.n_numaux + 1) * symesz;
- if (EXTERN_SYM_P (sym.n_sclass) && sym.n_scnum != N_UNDEF)
- {
- const char *name;
- char buf[SYMNMLEN + 1];
- struct bfd_link_hash_entry *h;
- /* This symbol is externally visible, and is defined by this
- object file. */
- name = _bfd_coff_internal_syment_name (abfd, &sym, buf);
- if (name == NULL)
- return false;
- h = bfd_link_hash_lookup (info->hash, name, false, false, true);
- /* We are only interested in symbols that are currently
- undefined. If a symbol is currently known to be common,
- XCOFF linkers do not bring in an object file which
- defines it. We also don't bring in symbols to satisfy
- undefined references in shared objects. */
- if (h != NULL
- && h->type == bfd_link_hash_undefined
- && (info->output_bfd->xvec != abfd->xvec
- || (((struct xcoff_link_hash_entry *) h)->flags
- & XCOFF_DEF_DYNAMIC) == 0))
- {
- if (!(*info->callbacks
- ->add_archive_element) (info, abfd, name, subsbfd))
- continue;
- *pneeded = true;
- return true;
- }
- }
- }
- /* We do not need this object file. */
- return true;
- }
- /* Check a single archive element to see if we need to include it in
- the link. *PNEEDED is set according to whether this element is
- needed in the link or not. This is called via
- _bfd_generic_link_add_archive_symbols. */
- static bool
- xcoff_link_check_archive_element (bfd *abfd,
- struct bfd_link_info *info,
- struct bfd_link_hash_entry *h ATTRIBUTE_UNUSED,
- const char *name ATTRIBUTE_UNUSED,
- bool *pneeded)
- {
- bool keep_syms_p;
- bfd *oldbfd;
- keep_syms_p = (obj_coff_external_syms (abfd) != NULL);
- if (!_bfd_coff_get_external_symbols (abfd))
- return false;
- oldbfd = abfd;
- if (!xcoff_link_check_ar_symbols (abfd, info, pneeded, &abfd))
- return false;
- if (*pneeded)
- {
- /* Potentially, the add_archive_element hook may have set a
- substitute BFD for us. */
- if (abfd != oldbfd)
- {
- if (!keep_syms_p
- && !_bfd_coff_free_symbols (oldbfd))
- return false;
- keep_syms_p = (obj_coff_external_syms (abfd) != NULL);
- if (!_bfd_coff_get_external_symbols (abfd))
- return false;
- }
- if (!xcoff_link_add_symbols (abfd, info))
- return false;
- if (info->keep_memory)
- keep_syms_p = true;
- }
- if (!keep_syms_p)
- {
- if (!_bfd_coff_free_symbols (abfd))
- return false;
- }
- return true;
- }
- /* Given an XCOFF BFD, add symbols to the global hash table as
- appropriate. */
- bool
- _bfd_xcoff_bfd_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
- {
- switch (bfd_get_format (abfd))
- {
- case bfd_object:
- return xcoff_link_add_object_symbols (abfd, info);
- case bfd_archive:
- /* If the archive has a map, do the usual search. We then need
- to check the archive for dynamic objects, because they may not
- appear in the archive map even though they should, perhaps, be
- included. If the archive has no map, we just consider each object
- file in turn, since that apparently is what the AIX native linker
- does. */
- if (bfd_has_map (abfd))
- {
- if (! (_bfd_generic_link_add_archive_symbols
- (abfd, info, xcoff_link_check_archive_element)))
- return false;
- }
- {
- bfd *member;
- member = bfd_openr_next_archived_file (abfd, NULL);
- while (member != NULL)
- {
- if (bfd_check_format (member, bfd_object)
- && (info->output_bfd->xvec == member->xvec)
- && (! bfd_has_map (abfd) || (member->flags & DYNAMIC) != 0))
- {
- bool needed;
- if (! xcoff_link_check_archive_element (member, info,
- NULL, NULL, &needed))
- return false;
- if (needed)
- member->archive_pass = -1;
- }
- member = bfd_openr_next_archived_file (abfd, member);
- }
- }
- return true;
- default:
- bfd_set_error (bfd_error_wrong_format);
- return false;
- }
- }
- bool
- _bfd_xcoff_define_common_symbol (bfd *output_bfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info ATTRIBUTE_UNUSED,
- struct bfd_link_hash_entry *harg)
- {
- struct xcoff_link_hash_entry *h;
- if (!bfd_generic_define_common_symbol (output_bfd, info, harg))
- return false;
- h = (struct xcoff_link_hash_entry *) harg;
- h->flags |= XCOFF_DEF_REGULAR;
- return true;
- }
- /* If symbol H has not been interpreted as a function descriptor,
- see whether it should be. Set up its descriptor information if so. */
- static bool
- xcoff_find_function (struct bfd_link_info *info,
- struct xcoff_link_hash_entry *h)
- {
- if ((h->flags & XCOFF_DESCRIPTOR) == 0
- && h->root.root.string[0] != '.')
- {
- char *fnname;
- struct xcoff_link_hash_entry *hfn;
- size_t amt;
- amt = strlen (h->root.root.string) + 2;
- fnname = bfd_malloc (amt);
- if (fnname == NULL)
- return false;
- fnname[0] = '.';
- strcpy (fnname + 1, h->root.root.string);
- hfn = xcoff_link_hash_lookup (xcoff_hash_table (info),
- fnname, false, false, true);
- free (fnname);
- if (hfn != NULL
- && hfn->smclas == XMC_PR
- && (hfn->root.type == bfd_link_hash_defined
- || hfn->root.type == bfd_link_hash_defweak))
- {
- h->flags |= XCOFF_DESCRIPTOR;
- h->descriptor = hfn;
- hfn->descriptor = h;
- }
- }
- return true;
- }
- /* Return true if the given bfd contains at least one shared object. */
- static bool
- xcoff_archive_contains_shared_object_p (struct bfd_link_info *info,
- bfd *archive)
- {
- struct xcoff_archive_info *archive_info;
- bfd *member;
- archive_info = xcoff_get_archive_info (info, archive);
- if (!archive_info->know_contains_shared_object_p)
- {
- member = bfd_openr_next_archived_file (archive, NULL);
- while (member != NULL && (member->flags & DYNAMIC) == 0)
- member = bfd_openr_next_archived_file (archive, member);
- archive_info->contains_shared_object_p = (member != NULL);
- archive_info->know_contains_shared_object_p = 1;
- }
- return archive_info->contains_shared_object_p;
- }
- /* Symbol H qualifies for export by -bexpfull. Return true if it also
- qualifies for export by -bexpall. */
- static bool
- xcoff_covered_by_expall_p (struct xcoff_link_hash_entry *h)
- {
- /* Exclude symbols beginning with '_'. */
- if (h->root.root.string[0] == '_')
- return false;
- /* Exclude archive members that would otherwise be unreferenced. */
- if ((h->flags & XCOFF_MARK) == 0
- && (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && h->root.u.def.section->owner != NULL
- && h->root.u.def.section->owner->my_archive != NULL)
- return false;
- return true;
- }
- /* Return true if symbol H qualifies for the forms of automatic export
- specified by AUTO_EXPORT_FLAGS. */
- static bool
- xcoff_auto_export_p (struct bfd_link_info *info,
- struct xcoff_link_hash_entry *h,
- unsigned int auto_export_flags)
- {
- /* Don't automatically export things that were explicitly exported. */
- if ((h->flags & XCOFF_EXPORT) != 0)
- return false;
- /* Don't export things that we don't define. */
- if ((h->flags & XCOFF_DEF_REGULAR) == 0)
- return false;
- /* Don't export functions; export their descriptors instead. */
- if (h->root.root.string[0] == '.')
- return false;
- /* Don't export hidden or internal symbols. */
- if (h->visibility == SYM_V_HIDDEN
- || h->visibility == SYM_V_INTERNAL)
- return false;
- /* We don't export a symbol which is being defined by an object
- included from an archive which contains a shared object. The
- rationale is that if an archive contains both an unshared and
- a shared object, then there must be some reason that the
- unshared object is unshared, and we don't want to start
- providing a shared version of it. In particular, this solves
- a bug involving the _savefNN set of functions. gcc will call
- those functions without providing a slot to restore the TOC,
- so it is essential that these functions be linked in directly
- and not from a shared object, which means that a shared
- object which also happens to link them in must not export
- them. This is confusing, but I haven't been able to think of
- a different approach. Note that the symbols can, of course,
- be exported explicitly. */
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- bfd *owner;
- owner = h->root.u.def.section->owner;
- if (owner != NULL
- && owner->my_archive != NULL
- && xcoff_archive_contains_shared_object_p (info, owner->my_archive))
- return false;
- }
- /* Otherwise, all symbols are exported by -bexpfull. */
- if ((auto_export_flags & XCOFF_EXPFULL) != 0)
- return true;
- /* Despite its name, -bexpall exports most but not all symbols. */
- if ((auto_export_flags & XCOFF_EXPALL) != 0
- && xcoff_covered_by_expall_p (h))
- return true;
- return false;
- }
- /* Return true if relocation REL needs to be copied to the .loader section.
- If REL is against a global symbol, H is that symbol, otherwise it
- is null. */
- static bool
- xcoff_need_ldrel_p (struct bfd_link_info *info, struct internal_reloc *rel,
- struct xcoff_link_hash_entry *h, asection *ssec)
- {
- if (!xcoff_hash_table (info)->loader_section)
- return false;
- switch (rel->r_type)
- {
- case R_TOC:
- case R_GL:
- case R_TCL:
- case R_TRL:
- case R_TRLA:
- /* We should never need a .loader reloc for a TOC-relative reloc. */
- return false;
- default:
- /* In this case, relocations against defined symbols can be resolved
- statically. */
- if (h == NULL
- || h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak
- || h->root.type == bfd_link_hash_common)
- return false;
- /* We will always provide a local definition of function symbols,
- even if we don't have one yet. */
- if ((h->flags & XCOFF_CALLED) != 0)
- return false;
- return true;
- case R_POS:
- case R_NEG:
- case R_RL:
- case R_RLA:
- /* Absolute relocations against absolute symbols can be
- resolved statically. */
- if (h != NULL
- && (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && !h->root.rel_from_abs)
- {
- asection *sec = h->root.u.def.section;
- if (bfd_is_abs_section (sec)
- || (sec != NULL
- && bfd_is_abs_section (sec->output_section)))
- return false;
- }
- /* Absolute relocations from read-only sections are forbidden
- by AIX loader. However, they can appear in their section's
- relocations. */
- if (ssec != NULL
- && (ssec->output_section->flags & SEC_READONLY) != 0)
- return false;
- return true;
- case R_TLS:
- case R_TLS_LE:
- case R_TLS_IE:
- case R_TLS_LD:
- case R_TLSM:
- case R_TLSML:
- return true;
- }
- }
- /* Mark a symbol as not being garbage, including the section in which
- it is defined. */
- static inline bool
- xcoff_mark_symbol (struct bfd_link_info *info, struct xcoff_link_hash_entry *h)
- {
- if ((h->flags & XCOFF_MARK) != 0)
- return true;
- h->flags |= XCOFF_MARK;
- /* If we're marking an undefined symbol, try find some way of
- defining it. */
- if (!bfd_link_relocatable (info)
- && (h->flags & XCOFF_IMPORT) == 0
- && (h->flags & XCOFF_DEF_REGULAR) == 0
- && (h->root.type == bfd_link_hash_undefined
- || h->root.type == bfd_link_hash_undefweak))
- {
- /* First check whether this symbol can be interpreted as an
- undefined function descriptor for a defined function symbol. */
- if (!xcoff_find_function (info, h))
- return false;
- if ((h->flags & XCOFF_DESCRIPTOR) != 0
- && (h->descriptor->root.type == bfd_link_hash_defined
- || h->descriptor->root.type == bfd_link_hash_defweak))
- {
- /* This is a descriptor for a defined symbol, but the input
- objects have not defined the descriptor itself. Fill in
- the definition automatically.
- Note that we do this even if we found a dynamic definition
- of H. The local function definition logically overrides
- the dynamic one. */
- asection *sec;
- sec = xcoff_hash_table (info)->descriptor_section;
- h->root.type = bfd_link_hash_defined;
- h->root.u.def.section = sec;
- h->root.u.def.value = sec->size;
- h->smclas = XMC_DS;
- h->flags |= XCOFF_DEF_REGULAR;
- /* The size of the function descriptor depends on whether this
- is xcoff32 (12) or xcoff64 (24). */
- sec->size += bfd_xcoff_function_descriptor_size (sec->owner);
- /* A function descriptor uses two relocs: one for the
- associated code, and one for the TOC address. */
- xcoff_hash_table (info)->ldrel_count += 2;
- sec->reloc_count += 2;
- /* Mark the function itself. */
- if (!xcoff_mark_symbol (info, h->descriptor))
- return false;
- /* Mark the TOC section, so that we get an anchor
- to relocate against. */
- if (!xcoff_mark (info, xcoff_hash_table (info)->toc_section))
- return false;
- /* We handle writing out the contents of the descriptor in
- xcoff_write_global_symbol. */
- }
- else if (info->static_link)
- /* We can't get a symbol value dynamically, so just assume
- that it's undefined. */
- h->flags |= XCOFF_WAS_UNDEFINED;
- else if ((h->flags & XCOFF_CALLED) != 0)
- {
- /* This is a function symbol for which we need to create
- linkage code. */
- asection *sec;
- struct xcoff_link_hash_entry *hds;
- /* Mark the descriptor (and its TOC section). */
- hds = h->descriptor;
- BFD_ASSERT ((hds->root.type == bfd_link_hash_undefined
- || hds->root.type == bfd_link_hash_undefweak)
- && (hds->flags & XCOFF_DEF_REGULAR) == 0);
- if (!xcoff_mark_symbol (info, hds))
- return false;
- /* Treat this symbol as undefined if the descriptor was. */
- if ((hds->flags & XCOFF_WAS_UNDEFINED) != 0)
- h->flags |= XCOFF_WAS_UNDEFINED;
- /* Allocate room for the global linkage code itself. */
- sec = xcoff_hash_table (info)->linkage_section;
- h->root.type = bfd_link_hash_defined;
- h->root.u.def.section = sec;
- h->root.u.def.value = sec->size;
- h->smclas = XMC_GL;
- h->flags |= XCOFF_DEF_REGULAR;
- sec->size += bfd_xcoff_glink_code_size (info->output_bfd);
- /* The global linkage code requires a TOC entry for the
- descriptor. */
- if (hds->toc_section == NULL)
- {
- int byte_size;
- /* 32 vs 64
- xcoff32 uses 4 bytes in the toc.
- xcoff64 uses 8 bytes in the toc. */
- if (bfd_xcoff_is_xcoff64 (info->output_bfd))
- byte_size = 8;
- else if (bfd_xcoff_is_xcoff32 (info->output_bfd))
- byte_size = 4;
- else
- return false;
- /* Allocate room in the fallback TOC section. */
- hds->toc_section = xcoff_hash_table (info)->toc_section;
- hds->u.toc_offset = hds->toc_section->size;
- hds->toc_section->size += byte_size;
- if (!xcoff_mark (info, hds->toc_section))
- return false;
- /* Allocate room for a static and dynamic R_TOC
- relocation. */
- ++xcoff_hash_table (info)->ldrel_count;
- ++hds->toc_section->reloc_count;
- /* Set the index to -2 to force this symbol to
- get written out. */
- hds->indx = -2;
- hds->flags |= XCOFF_SET_TOC | XCOFF_LDREL;
- }
- }
- else if ((h->flags & XCOFF_DEF_DYNAMIC) == 0)
- {
- /* Record that the symbol was undefined, then import it.
- -brtl links use a special fake import file. */
- h->flags |= XCOFF_WAS_UNDEFINED | XCOFF_IMPORT;
- if (xcoff_hash_table (info)->rtld)
- {
- if (!xcoff_set_import_path (info, h, "", "..", ""))
- return false;
- }
- else
- {
- if (!xcoff_set_import_path (info, h, NULL, NULL, NULL))
- return false;
- }
- }
- }
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- asection *hsec;
- hsec = h->root.u.def.section;
- if (! bfd_is_abs_section (hsec)
- && hsec->gc_mark == 0)
- {
- if (! xcoff_mark (info, hsec))
- return false;
- }
- }
- if (h->toc_section != NULL
- && h->toc_section->gc_mark == 0)
- {
- if (! xcoff_mark (info, h->toc_section))
- return false;
- }
- return true;
- }
- /* Look for a symbol called NAME. If the symbol is defined, mark it.
- If the symbol exists, set FLAGS. */
- static bool
- xcoff_mark_symbol_by_name (struct bfd_link_info *info,
- const char *name, unsigned int flags)
- {
- struct xcoff_link_hash_entry *h;
- h = xcoff_link_hash_lookup (xcoff_hash_table (info), name,
- false, false, true);
- if (h != NULL)
- {
- h->flags |= flags;
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- if (!xcoff_mark (info, h->root.u.def.section))
- return false;
- }
- }
- return true;
- }
- /* The mark phase of garbage collection. For a given section, mark
- it, and all the sections which define symbols to which it refers.
- Because this function needs to look at the relocs, we also count
- the number of relocs which need to be copied into the .loader
- section. */
- static bool
- xcoff_mark (struct bfd_link_info *info, asection *sec)
- {
- if (bfd_is_const_section (sec)
- || sec->gc_mark != 0)
- return true;
- sec->gc_mark = 1;
- if (sec->owner->xvec != info->output_bfd->xvec)
- return true;
- if (coff_section_data (sec->owner, sec) == NULL)
- return true;
- if (xcoff_section_data (sec->owner, sec) != NULL)
- {
- struct xcoff_link_hash_entry **syms;
- asection **csects;
- unsigned long i, first, last;
- /* Mark all the symbols in this section. */
- syms = obj_xcoff_sym_hashes (sec->owner);
- csects = xcoff_data (sec->owner)->csects;
- first = xcoff_section_data (sec->owner, sec)->first_symndx;
- last = xcoff_section_data (sec->owner, sec)->last_symndx;
- for (i = first; i <= last; i++)
- if (csects[i] == sec
- && syms[i] != NULL
- && (syms[i]->flags & XCOFF_MARK) == 0)
- {
- if (!xcoff_mark_symbol (info, syms[i]))
- return false;
- }
- }
- /* Look through the section relocs. */
- if ((sec->flags & SEC_RELOC) != 0
- && sec->reloc_count > 0)
- {
- struct internal_reloc *rel, *relend;
- rel = xcoff_read_internal_relocs (sec->owner, sec, true,
- NULL, false, NULL);
- if (rel == NULL)
- return false;
- relend = rel + sec->reloc_count;
- for (; rel < relend; rel++)
- {
- struct xcoff_link_hash_entry *h;
- if ((unsigned int) rel->r_symndx
- > obj_raw_syment_count (sec->owner))
- continue;
- h = obj_xcoff_sym_hashes (sec->owner)[rel->r_symndx];
- if (h != NULL)
- {
- if ((h->flags & XCOFF_MARK) == 0)
- {
- if (!xcoff_mark_symbol (info, h))
- return false;
- }
- }
- else
- {
- asection *rsec;
- rsec = xcoff_data (sec->owner)->csects[rel->r_symndx];
- if (rsec != NULL
- && rsec->gc_mark == 0)
- {
- if (!xcoff_mark (info, rsec))
- return false;
- }
- }
- /* See if this reloc needs to be copied into the .loader
- section. */
- if ((sec->flags & SEC_DEBUGGING) == 0
- && xcoff_need_ldrel_p (info, rel, h, sec))
- {
- ++xcoff_hash_table (info)->ldrel_count;
- if (h != NULL)
- h->flags |= XCOFF_LDREL;
- }
- }
- if (! info->keep_memory
- && coff_section_data (sec->owner, sec) != NULL
- && ! coff_section_data (sec->owner, sec)->keep_relocs)
- {
- free (coff_section_data (sec->owner, sec)->relocs);
- coff_section_data (sec->owner, sec)->relocs = NULL;
- }
- }
- return true;
- }
- /* Routines that are called after all the input files have been
- handled, but before the sections are laid out in memory. */
- /* The sweep phase of garbage collection. Remove all garbage
- sections. */
- static void
- xcoff_sweep (struct bfd_link_info *info)
- {
- bfd *sub;
- for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
- {
- asection *o;
- bool some_kept = false;
- /* As says below keep all sections from non-XCOFF
- input files. */
- if (sub->xvec != info->output_bfd->xvec)
- some_kept = true;
- else
- {
- /* See whether any section is already marked. */
- for (o = sub->sections; o != NULL; o = o->next)
- if (o->gc_mark)
- some_kept = true;
- }
- /* If no section in this file will be kept, then we can
- toss out debug sections. */
- if (!some_kept)
- {
- for (o = sub->sections; o != NULL; o = o->next)
- {
- o->size = 0;
- o->reloc_count = 0;
- }
- continue;
- }
- /* Keep all sections from non-XCOFF input files. Keep
- special sections. Keep .debug sections for the
- moment. */
- for (o = sub->sections; o != NULL; o = o->next)
- {
- if (o->gc_mark == 1)
- continue;
- if (sub->xvec != info->output_bfd->xvec
- || o == xcoff_hash_table (info)->debug_section
- || o == xcoff_hash_table (info)->loader_section
- || o == xcoff_hash_table (info)->linkage_section
- || o == xcoff_hash_table (info)->descriptor_section
- || (bfd_section_flags (o) & SEC_DEBUGGING)
- || strcmp (o->name, ".debug") == 0)
- xcoff_mark (info, o);
- else
- {
- o->size = 0;
- o->reloc_count = 0;
- }
- }
- }
- }
- /* Record the number of elements in a set. This is used to output the
- correct csect length. */
- bool
- bfd_xcoff_link_record_set (bfd *output_bfd,
- struct bfd_link_info *info,
- struct bfd_link_hash_entry *harg,
- bfd_size_type size)
- {
- struct xcoff_link_hash_entry *h = (struct xcoff_link_hash_entry *) harg;
- struct xcoff_link_size_list *n;
- size_t amt;
- if (bfd_get_flavour (output_bfd) != bfd_target_xcoff_flavour)
- return true;
- /* This will hardly ever be called. I don't want to burn four bytes
- per global symbol, so instead the size is kept on a linked list
- attached to the hash table. */
- amt = sizeof (* n);
- n = bfd_alloc (output_bfd, amt);
- if (n == NULL)
- return false;
- n->next = xcoff_hash_table (info)->size_list;
- n->h = h;
- n->size = size;
- xcoff_hash_table (info)->size_list = n;
- h->flags |= XCOFF_HAS_SIZE;
- return true;
- }
- /* Import a symbol. */
- bool
- bfd_xcoff_import_symbol (bfd *output_bfd,
- struct bfd_link_info *info,
- struct bfd_link_hash_entry *harg,
- bfd_vma val,
- const char *imppath,
- const char *impfile,
- const char *impmember,
- unsigned int syscall_flag)
- {
- struct xcoff_link_hash_entry *h = (struct xcoff_link_hash_entry *) harg;
- if (bfd_get_flavour (output_bfd) != bfd_target_xcoff_flavour)
- return true;
- /* A symbol name which starts with a period is the code for a
- function. If the symbol is undefined, then add an undefined
- symbol for the function descriptor, and import that instead. */
- if (h->root.root.string[0] == '.'
- && h->root.type == bfd_link_hash_undefined
- && val == (bfd_vma) -1)
- {
- struct xcoff_link_hash_entry *hds;
- hds = h->descriptor;
- if (hds == NULL)
- {
- hds = xcoff_link_hash_lookup (xcoff_hash_table (info),
- h->root.root.string + 1,
- true, false, true);
- if (hds == NULL)
- return false;
- if (hds->root.type == bfd_link_hash_new)
- {
- hds->root.type = bfd_link_hash_undefined;
- hds->root.u.undef.abfd = h->root.u.undef.abfd;
- }
- hds->flags |= XCOFF_DESCRIPTOR;
- BFD_ASSERT ((h->flags & XCOFF_DESCRIPTOR) == 0);
- hds->descriptor = h;
- h->descriptor = hds;
- }
- /* Now, if the descriptor is undefined, import the descriptor
- rather than the symbol we were told to import. FIXME: Is
- this correct in all cases? */
- if (hds->root.type == bfd_link_hash_undefined)
- h = hds;
- }
- h->flags |= (XCOFF_IMPORT | syscall_flag);
- if (val != (bfd_vma) -1)
- {
- if (h->root.type == bfd_link_hash_defined)
- (*info->callbacks->multiple_definition) (info, &h->root, output_bfd,
- bfd_abs_section_ptr, val);
- h->root.type = bfd_link_hash_defined;
- h->root.u.def.section = bfd_abs_section_ptr;
- h->root.u.def.value = val;
- h->smclas = XMC_XO;
- }
- if (!xcoff_set_import_path (info, h, imppath, impfile, impmember))
- return false;
- return true;
- }
- /* Export a symbol. */
- bool
- bfd_xcoff_export_symbol (bfd *output_bfd,
- struct bfd_link_info *info,
- struct bfd_link_hash_entry *harg)
- {
- struct xcoff_link_hash_entry *h = (struct xcoff_link_hash_entry *) harg;
- if (bfd_get_flavour (output_bfd) != bfd_target_xcoff_flavour)
- return true;
- /* As AIX linker, symbols exported with hidden visibility are
- silently ignored. */
- if (h->visibility == SYM_V_HIDDEN)
- return true;
- if (h->visibility == SYM_V_INTERNAL)
- {
- _bfd_error_handler (_("%pB: cannot export internal symbol `%s`."),
- output_bfd, h->root.root.string);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- h->flags |= XCOFF_EXPORT;
- /* FIXME: I'm not at all sure what syscall is supposed to mean, so
- I'm just going to ignore it until somebody explains it. */
- /* Make sure we don't garbage collect this symbol. */
- if (! xcoff_mark_symbol (info, h))
- return false;
- /* If this is a function descriptor, make sure we don't garbage
- collect the associated function code. We normally don't have to
- worry about this, because the descriptor will be attached to a
- section with relocs, but if we are creating the descriptor
- ourselves those relocs will not be visible to the mark code. */
- if ((h->flags & XCOFF_DESCRIPTOR) != 0)
- {
- if (! xcoff_mark_symbol (info, h->descriptor))
- return false;
- }
- return true;
- }
- /* Count a reloc against a symbol. This is called for relocs
- generated by the linker script, typically for global constructors
- and destructors. */
- bool
- bfd_xcoff_link_count_reloc (bfd *output_bfd,
- struct bfd_link_info *info,
- const char *name)
- {
- struct xcoff_link_hash_entry *h;
- if (bfd_get_flavour (output_bfd) != bfd_target_xcoff_flavour)
- return true;
- h = ((struct xcoff_link_hash_entry *)
- bfd_wrapped_link_hash_lookup (output_bfd, info, name, false, false,
- false));
- if (h == NULL)
- {
- _bfd_error_handler (_("%s: no such symbol"), name);
- bfd_set_error (bfd_error_no_symbols);
- return false;
- }
- h->flags |= XCOFF_REF_REGULAR;
- if (xcoff_hash_table (info)->loader_section)
- {
- h->flags |= XCOFF_LDREL;
- ++xcoff_hash_table (info)->ldrel_count;
- }
- /* Mark the symbol to avoid garbage collection. */
- if (! xcoff_mark_symbol (info, h))
- return false;
- return true;
- }
- /* This function is called for each symbol to which the linker script
- assigns a value.
- FIXME: In cases like the linker test ld-scripts/defined5 where a
- symbol is defined both by an input object file and the script,
- the script definition doesn't override the object file definition
- as is usual for other targets. At least not when the symbol is
- output. Other uses of the symbol value by the linker do use the
- script value. */
- bool
- bfd_xcoff_record_link_assignment (bfd *output_bfd,
- struct bfd_link_info *info,
- const char *name)
- {
- struct xcoff_link_hash_entry *h;
- if (bfd_get_flavour (output_bfd) != bfd_target_xcoff_flavour)
- return true;
- h = xcoff_link_hash_lookup (xcoff_hash_table (info), name, true, true,
- false);
- if (h == NULL)
- return false;
- h->flags |= XCOFF_DEF_REGULAR;
- return true;
- }
- /* An xcoff_link_hash_traverse callback for which DATA points to an
- xcoff_loader_info. Mark all symbols that should be automatically
- exported. */
- static bool
- xcoff_mark_auto_exports (struct xcoff_link_hash_entry *h, void *data)
- {
- struct xcoff_loader_info *ldinfo;
- ldinfo = (struct xcoff_loader_info *) data;
- if (xcoff_auto_export_p (ldinfo->info, h, ldinfo->auto_export_flags))
- {
- if (!xcoff_mark_symbol (ldinfo->info, h))
- ldinfo->failed = true;
- }
- return true;
- }
- /* INPUT_BFD has an external symbol associated with hash table entry H
- and csect CSECT. Return true if INPUT_BFD defines H. */
- static bool
- xcoff_final_definition_p (bfd *input_bfd, struct xcoff_link_hash_entry *h,
- asection *csect)
- {
- switch (h->root.type)
- {
- case bfd_link_hash_defined:
- case bfd_link_hash_defweak:
- /* No input bfd owns absolute symbols. They are written by
- xcoff_write_global_symbol instead. */
- return (!bfd_is_abs_section (csect)
- && h->root.u.def.section == csect);
- case bfd_link_hash_common:
- return h->root.u.c.p->section->owner == input_bfd;
- case bfd_link_hash_undefined:
- case bfd_link_hash_undefweak:
- /* We can't treat undef.abfd as the owner because that bfd
- might be a dynamic object. Allow any bfd to claim it. */
- return true;
- default:
- abort ();
- }
- }
- /* See if H should have a loader symbol associated with it. */
- static bool
- xcoff_build_ldsym (struct xcoff_loader_info *ldinfo,
- struct xcoff_link_hash_entry *h)
- {
- size_t amt;
- /* Warn if this symbol is exported but not defined. */
- if ((h->flags & XCOFF_EXPORT) != 0
- && (h->flags & XCOFF_WAS_UNDEFINED) != 0)
- {
- _bfd_error_handler
- (_("warning: attempt to export undefined symbol `%s'"),
- h->root.root.string);
- return true;
- }
- /* We need to add a symbol to the .loader section if it is mentioned
- in a reloc which we are copying to the .loader section and it was
- not defined or common, or if it is the entry point, or if it is
- being exported. */
- if (((h->flags & XCOFF_LDREL) == 0
- || h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak
- || h->root.type == bfd_link_hash_common)
- && (h->flags & XCOFF_ENTRY) == 0
- && (h->flags & XCOFF_EXPORT) == 0)
- return true;
- /* We need to add this symbol to the .loader symbols. */
- BFD_ASSERT (h->ldsym == NULL);
- amt = sizeof (struct internal_ldsym);
- h->ldsym = bfd_zalloc (ldinfo->output_bfd, amt);
- if (h->ldsym == NULL)
- {
- ldinfo->failed = true;
- return false;
- }
- if ((h->flags & XCOFF_IMPORT) != 0)
- {
- /* Give imported descriptors class XMC_DS rather than XMC_UA. */
- if ((h->flags & XCOFF_DESCRIPTOR) != 0)
- h->smclas = XMC_DS;
- h->ldsym->l_ifile = h->ldindx;
- }
- /* The first 3 symbol table indices are reserved to indicate the
- data, text and bss sections. */
- h->ldindx = ldinfo->ldsym_count + 3;
- ++ldinfo->ldsym_count;
- if (! bfd_xcoff_put_ldsymbol_name (ldinfo->output_bfd, ldinfo,
- h->ldsym, h->root.root.string))
- return false;
- h->flags |= XCOFF_BUILT_LDSYM;
- return true;
- }
- /* An xcoff_htab_traverse callback that is called for each symbol
- once garbage collection is complete. */
- static bool
- xcoff_post_gc_symbol (struct xcoff_link_hash_entry *h, void * p)
- {
- struct xcoff_loader_info *ldinfo = (struct xcoff_loader_info *) p;
- /* __rtinit, this symbol has special handling. */
- if (h->flags & XCOFF_RTINIT)
- return true;
- /* We don't want to garbage collect symbols which are not defined in
- XCOFF files. This is a convenient place to mark them. */
- if (xcoff_hash_table (ldinfo->info)->gc
- && (h->flags & XCOFF_MARK) == 0
- && (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && (h->root.u.def.section->owner == NULL
- || (h->root.u.def.section->owner->xvec
- != ldinfo->info->output_bfd->xvec)))
- h->flags |= XCOFF_MARK;
- /* Skip discarded symbols. */
- if (xcoff_hash_table (ldinfo->info)->gc
- && (h->flags & XCOFF_MARK) == 0)
- return true;
- /* If this is still a common symbol, and it wasn't garbage
- collected, we need to actually allocate space for it in the .bss
- section. */
- if (h->root.type == bfd_link_hash_common
- && h->root.u.c.p->section->size == 0)
- {
- BFD_ASSERT (bfd_is_com_section (h->root.u.c.p->section));
- h->root.u.c.p->section->size = h->root.u.c.size;
- }
- if (xcoff_hash_table (ldinfo->info)->loader_section)
- {
- if (xcoff_auto_export_p (ldinfo->info, h, ldinfo->auto_export_flags))
- h->flags |= XCOFF_EXPORT;
- if (!xcoff_build_ldsym (ldinfo, h))
- return false;
- }
- return true;
- }
- /* INPUT_BFD includes XCOFF symbol ISYM, which is associated with linker
- hash table entry H and csect CSECT. AUX contains ISYM's auxiliary
- csect information, if any. NAME is the function's name if the name
- is stored in the .debug section, otherwise it is null.
- Return 1 if we should include an appropriately-adjusted ISYM
- in the output file, 0 if we should discard ISYM, or -1 if an
- error occured. */
- static int
- xcoff_keep_symbol_p (struct bfd_link_info *info, bfd *input_bfd,
- struct internal_syment *isym,
- union internal_auxent *aux,
- struct xcoff_link_hash_entry *h,
- asection *csect, const char *name)
- {
- int smtyp;
- /* If we are skipping this csect, we want to strip the symbol too. */
- if (csect == NULL)
- return 0;
- /* Likewise if we garbage-collected the csect. */
- if (xcoff_hash_table (info)->gc
- && !bfd_is_abs_section (csect)
- && !bfd_is_und_section (csect)
- && csect->gc_mark == 0)
- return 0;
- /* An XCOFF linker always removes C_STAT symbols. */
- if (isym->n_sclass == C_STAT)
- return 0;
- /* We generate the TOC anchor separately. */
- if (isym->n_sclass == C_HIDEXT
- && aux->x_csect.x_smclas == XMC_TC0)
- return 0;
- /* If we are stripping all symbols, we want to discard this one. */
- if (info->strip == strip_all)
- return 0;
- /* Discard symbols that are defined elsewhere. */
- if (EXTERN_SYM_P (isym->n_sclass))
- {
- if ((h->flags & XCOFF_ALLOCATED) != 0)
- return 0;
- if (!xcoff_final_definition_p (input_bfd, h, csect))
- return 0;
- }
- /* If we're discarding local symbols, check whether ISYM is local. */
- smtyp = SMTYP_SMTYP (aux->x_csect.x_smtyp);
- if (info->discard == discard_all
- && !EXTERN_SYM_P (isym->n_sclass)
- && (isym->n_sclass != C_HIDEXT || smtyp != XTY_SD))
- return 0;
- /* If we're stripping debugging symbols, check whether ISYM is one. */
- if (info->strip == strip_debugger
- && isym->n_scnum == N_DEBUG)
- return 0;
- /* If we are stripping symbols based on name, check how ISYM's
- name should be handled. */
- if (info->strip == strip_some
- || info->discard == discard_l)
- {
- char buf[SYMNMLEN + 1];
- if (name == NULL)
- {
- name = _bfd_coff_internal_syment_name (input_bfd, isym, buf);
- if (name == NULL)
- return -1;
- }
- if (info->strip == strip_some
- && bfd_hash_lookup (info->keep_hash, name, false, false) == NULL)
- return 0;
- if (info->discard == discard_l
- && !EXTERN_SYM_P (isym->n_sclass)
- && (isym->n_sclass != C_HIDEXT || smtyp != XTY_SD)
- && bfd_is_local_label_name (input_bfd, name))
- return 0;
- }
- return 1;
- }
- /* Lay out the .loader section, filling in the header and the import paths.
- LIBPATH is as for bfd_xcoff_size_dynamic_sections. */
- static bool
- xcoff_build_loader_section (struct xcoff_loader_info *ldinfo,
- const char *libpath)
- {
- bfd *output_bfd;
- struct xcoff_link_hash_table *htab;
- struct internal_ldhdr *ldhdr;
- struct xcoff_import_file *fl;
- bfd_size_type stoff;
- size_t impsize, impcount;
- asection *lsec;
- char *out;
- /* Work out the size of the import file names. Each import file ID
- consists of three null terminated strings: the path, the file
- name, and the archive member name. The first entry in the list
- of names is the path to use to find objects, which the linker has
- passed in as the libpath argument. For some reason, the path
- entry in the other import file names appears to always be empty. */
- output_bfd = ldinfo->output_bfd;
- htab = xcoff_hash_table (ldinfo->info);
- impsize = strlen (libpath) + 3;
- impcount = 1;
- for (fl = htab->imports; fl != NULL; fl = fl->next)
- {
- ++impcount;
- impsize += (strlen (fl->path)
- + strlen (fl->file)
- + strlen (fl->member)
- + 3);
- }
- /* Set up the .loader section header. */
- ldhdr = &htab->ldhdr;
- ldhdr->l_version = bfd_xcoff_ldhdr_version(output_bfd);
- ldhdr->l_nsyms = ldinfo->ldsym_count;
- ldhdr->l_nreloc = htab->ldrel_count;
- ldhdr->l_istlen = impsize;
- ldhdr->l_nimpid = impcount;
- ldhdr->l_impoff = (bfd_xcoff_ldhdrsz (output_bfd)
- + ldhdr->l_nsyms * bfd_xcoff_ldsymsz (output_bfd)
- + ldhdr->l_nreloc * bfd_xcoff_ldrelsz (output_bfd));
- ldhdr->l_stlen = ldinfo->string_size;
- stoff = ldhdr->l_impoff + impsize;
- if (ldinfo->string_size == 0)
- ldhdr->l_stoff = 0;
- else
- ldhdr->l_stoff = stoff;
- /* 64 bit elements to ldhdr
- The swap out routine for 32 bit will ignore them.
- Nothing fancy, symbols come after the header and relocs come
- after symbols. */
- ldhdr->l_symoff = bfd_xcoff_ldhdrsz (output_bfd);
- ldhdr->l_rldoff = (bfd_xcoff_ldhdrsz (output_bfd)
- + ldhdr->l_nsyms * bfd_xcoff_ldsymsz (output_bfd));
- /* We now know the final size of the .loader section. Allocate
- space for it. */
- lsec = htab->loader_section;
- lsec->size = stoff + ldhdr->l_stlen;
- lsec->contents = bfd_zalloc (output_bfd, lsec->size);
- if (lsec->contents == NULL)
- return false;
- /* Set up the header. */
- bfd_xcoff_swap_ldhdr_out (output_bfd, ldhdr, lsec->contents);
- /* Set up the import file names. */
- out = (char *) lsec->contents + ldhdr->l_impoff;
- strcpy (out, libpath);
- out += strlen (libpath) + 1;
- *out++ = '\0';
- *out++ = '\0';
- for (fl = htab->imports; fl != NULL; fl = fl->next)
- {
- const char *s;
- s = fl->path;
- while ((*out++ = *s++) != '\0')
- ;
- s = fl->file;
- while ((*out++ = *s++) != '\0')
- ;
- s = fl->member;
- while ((*out++ = *s++) != '\0')
- ;
- }
- BFD_ASSERT ((bfd_size_type) ((bfd_byte *) out - lsec->contents) == stoff);
- /* Set up the symbol string table. */
- if (ldinfo->string_size > 0)
- {
- memcpy (out, ldinfo->strings, ldinfo->string_size);
- free (ldinfo->strings);
- ldinfo->strings = NULL;
- }
- /* We can't set up the symbol table or the relocs yet, because we
- don't yet know the final position of the various sections. The
- .loader symbols are written out when the corresponding normal
- symbols are written out in xcoff_link_input_bfd or
- xcoff_write_global_symbol. The .loader relocs are written out
- when the corresponding normal relocs are handled in
- xcoff_link_input_bfd. */
- return true;
- }
- /* Build the .loader section. This is called by the XCOFF linker
- emulation before_allocation routine. We must set the size of the
- .loader section before the linker lays out the output file.
- LIBPATH is the library path to search for shared objects; this is
- normally built from the -L arguments passed to the linker. ENTRY
- is the name of the entry point symbol (the -e linker option).
- FILE_ALIGN is the alignment to use for sections within the file
- (the -H linker option). MAXSTACK is the maximum stack size (the
- -bmaxstack linker option). MAXDATA is the maximum data size (the
- -bmaxdata linker option). GC is whether to do garbage collection
- (the -bgc linker option). MODTYPE is the module type (the
- -bmodtype linker option). TEXTRO is whether the text section must
- be read only (the -btextro linker option). AUTO_EXPORT_FLAGS
- is a mask of XCOFF_EXPALL and XCOFF_EXPFULL. SPECIAL_SECTIONS
- is set by this routine to csects with magic names like _end. */
- bool
- bfd_xcoff_size_dynamic_sections (bfd *output_bfd,
- struct bfd_link_info *info,
- const char *libpath,
- const char *entry,
- unsigned long file_align,
- unsigned long maxstack,
- unsigned long maxdata,
- bool gc,
- int modtype,
- bool textro,
- unsigned int auto_export_flags,
- asection **special_sections,
- bool rtld)
- {
- struct xcoff_loader_info ldinfo;
- int i;
- asection *sec;
- bfd *sub;
- struct bfd_strtab_hash *debug_strtab;
- bfd_byte *debug_contents = NULL;
- size_t amt;
- if (bfd_get_flavour (output_bfd) != bfd_target_xcoff_flavour)
- {
- for (i = 0; i < XCOFF_NUMBER_OF_SPECIAL_SECTIONS; i++)
- special_sections[i] = NULL;
- return true;
- }
- ldinfo.failed = false;
- ldinfo.output_bfd = output_bfd;
- ldinfo.info = info;
- ldinfo.auto_export_flags = auto_export_flags;
- ldinfo.ldsym_count = 0;
- ldinfo.string_size = 0;
- ldinfo.strings = NULL;
- ldinfo.string_alc = 0;
- xcoff_data (output_bfd)->maxstack = maxstack;
- xcoff_data (output_bfd)->maxdata = maxdata;
- xcoff_data (output_bfd)->modtype = modtype;
- xcoff_hash_table (info)->file_align = file_align;
- xcoff_hash_table (info)->textro = textro;
- xcoff_hash_table (info)->rtld = rtld;
- /* __rtinit */
- if (xcoff_hash_table (info)->loader_section
- && (info->init_function || info->fini_function || rtld))
- {
- struct xcoff_link_hash_entry *hsym;
- struct internal_ldsym *ldsym;
- hsym = xcoff_link_hash_lookup (xcoff_hash_table (info),
- "__rtinit", false, false, true);
- if (hsym == NULL)
- {
- _bfd_error_handler
- (_("error: undefined symbol __rtinit"));
- return false;
- }
- xcoff_mark_symbol (info, hsym);
- hsym->flags |= (XCOFF_DEF_REGULAR | XCOFF_RTINIT);
- /* __rtinit initialized. */
- amt = sizeof (* ldsym);
- ldsym = bfd_malloc (amt);
- ldsym->l_value = 0; /* Will be filled in later. */
- ldsym->l_scnum = 2; /* Data section. */
- ldsym->l_smtype = XTY_SD; /* Csect section definition. */
- ldsym->l_smclas = 5; /* .rw. */
- ldsym->l_ifile = 0; /* Special system loader symbol. */
- ldsym->l_parm = 0; /* NA. */
- /* Force __rtinit to be the first symbol in the loader symbol table
- See xcoff_build_ldsyms
- The first 3 symbol table indices are reserved to indicate the data,
- text and bss sections. */
- BFD_ASSERT (0 == ldinfo.ldsym_count);
- hsym->ldindx = 3;
- ldinfo.ldsym_count = 1;
- hsym->ldsym = ldsym;
- if (! bfd_xcoff_put_ldsymbol_name (ldinfo.output_bfd, &ldinfo,
- hsym->ldsym, hsym->root.root.string))
- return false;
- /* This symbol is written out by xcoff_write_global_symbol
- Set stuff up so xcoff_write_global_symbol logic works. */
- hsym->flags |= XCOFF_DEF_REGULAR | XCOFF_MARK;
- hsym->root.type = bfd_link_hash_defined;
- hsym->root.u.def.value = 0;
- }
- /* Garbage collect unused sections. */
- if (bfd_link_relocatable (info) || !gc)
- {
- gc = false;
- xcoff_hash_table (info)->gc = false;
- /* We still need to call xcoff_mark, in order to set ldrel_count
- correctly. */
- for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
- {
- asection *o;
- for (o = sub->sections; o != NULL; o = o->next)
- {
- /* We shouldn't unconditionaly mark the TOC section.
- The output file should only have a TOC if either
- (a) one of the input files did or (b) we end up
- creating TOC references as part of the link process. */
- if (o != xcoff_hash_table (info)->toc_section
- && o->gc_mark == 0)
- {
- if (! xcoff_mark (info, o))
- goto error_return;
- }
- }
- }
- }
- else
- {
- if (entry != NULL
- && !xcoff_mark_symbol_by_name (info, entry, XCOFF_ENTRY))
- goto error_return;
- if (info->init_function != NULL
- && !xcoff_mark_symbol_by_name (info, info->init_function, 0))
- goto error_return;
- if (info->fini_function != NULL
- && !xcoff_mark_symbol_by_name (info, info->fini_function, 0))
- goto error_return;
- if (auto_export_flags != 0)
- {
- xcoff_link_hash_traverse (xcoff_hash_table (info),
- xcoff_mark_auto_exports, &ldinfo);
- if (ldinfo.failed)
- goto error_return;
- }
- xcoff_sweep (info);
- xcoff_hash_table (info)->gc = true;
- }
- /* Return special sections to the caller. */
- for (i = 0; i < XCOFF_NUMBER_OF_SPECIAL_SECTIONS; i++)
- {
- sec = xcoff_hash_table (info)->special_sections[i];
- if (sec != NULL
- && gc
- && sec->gc_mark == 0)
- sec = NULL;
- special_sections[i] = sec;
- }
- if (info->input_bfds == NULL)
- /* I'm not sure what to do in this bizarre case. */
- return true;
- xcoff_link_hash_traverse (xcoff_hash_table (info), xcoff_post_gc_symbol,
- (void *) &ldinfo);
- if (ldinfo.failed)
- goto error_return;
- if (xcoff_hash_table (info)->loader_section
- && !xcoff_build_loader_section (&ldinfo, libpath))
- goto error_return;
- /* Allocate space for the magic sections. */
- sec = xcoff_hash_table (info)->linkage_section;
- if (sec->size > 0)
- {
- sec->contents = bfd_zalloc (output_bfd, sec->size);
- if (sec->contents == NULL)
- goto error_return;
- }
- sec = xcoff_hash_table (info)->toc_section;
- if (sec->size > 0)
- {
- sec->contents = bfd_zalloc (output_bfd, sec->size);
- if (sec->contents == NULL)
- goto error_return;
- }
- sec = xcoff_hash_table (info)->descriptor_section;
- if (sec->size > 0)
- {
- sec->contents = bfd_zalloc (output_bfd, sec->size);
- if (sec->contents == NULL)
- goto error_return;
- }
- /* Now that we've done garbage collection, decide which symbols to keep,
- and figure out the contents of the .debug section. */
- debug_strtab = xcoff_hash_table (info)->debug_strtab;
- for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
- {
- asection *subdeb;
- bfd_size_type symcount;
- long *debug_index;
- asection **csectpp;
- unsigned int *lineno_counts;
- struct xcoff_link_hash_entry **sym_hash;
- bfd_byte *esym, *esymend;
- bfd_size_type symesz;
- if (sub->xvec != info->output_bfd->xvec)
- continue;
- if ((sub->flags & DYNAMIC) != 0
- && !info->static_link)
- continue;
- if (! _bfd_coff_get_external_symbols (sub))
- goto error_return;
- symcount = obj_raw_syment_count (sub);
- debug_index = bfd_zalloc (sub, symcount * sizeof (long));
- if (debug_index == NULL)
- goto error_return;
- xcoff_data (sub)->debug_indices = debug_index;
- if (info->strip == strip_all
- || info->strip == strip_debugger
- || info->discard == discard_all)
- /* We're stripping all debugging information, so there's no need
- to read SUB's .debug section. */
- subdeb = NULL;
- else
- {
- /* Grab the contents of SUB's .debug section, if any. */
- subdeb = bfd_get_section_by_name (sub, ".debug");
- if (subdeb != NULL && subdeb->size > 0)
- {
- /* We use malloc and copy the names into the debug
- stringtab, rather than bfd_alloc, because I expect
- that, when linking many files together, many of the
- strings will be the same. Storing the strings in the
- hash table should save space in this case. */
- if (!bfd_malloc_and_get_section (sub, subdeb, &debug_contents))
- goto error_return;
- }
- }
- csectpp = xcoff_data (sub)->csects;
- lineno_counts = xcoff_data (sub)->lineno_counts;
- sym_hash = obj_xcoff_sym_hashes (sub);
- symesz = bfd_coff_symesz (sub);
- esym = (bfd_byte *) obj_coff_external_syms (sub);
- esymend = esym + symcount * symesz;
- while (esym < esymend)
- {
- struct internal_syment sym;
- union internal_auxent aux;
- asection *csect;
- const char *name;
- int keep_p;
- bfd_coff_swap_sym_in (sub, esym, &sym);
- /* Read in the csect information, if any. */
- if (CSECT_SYM_P (sym.n_sclass))
- {
- BFD_ASSERT (sym.n_numaux > 0);
- bfd_coff_swap_aux_in (sub, esym + symesz * sym.n_numaux,
- sym.n_type, sym.n_sclass,
- sym.n_numaux - 1, sym.n_numaux, &aux);
- }
- /* If this symbol's name is stored in the debug section,
- get a pointer to it. */
- if (debug_contents != NULL
- && sym._n._n_n._n_zeroes == 0
- && bfd_coff_symname_in_debug (sub, &sym))
- name = (const char *) debug_contents + sym._n._n_n._n_offset;
- else
- name = NULL;
- /* Decide whether to copy this symbol to the output file. */
- csect = *csectpp;
- keep_p = xcoff_keep_symbol_p (info, sub, &sym, &aux,
- *sym_hash, csect, name);
- if (keep_p < 0)
- return false;
- if (!keep_p)
- /* Use a debug_index of -2 to record that a symbol should
- be stripped. */
- *debug_index = -2;
- else
- {
- /* See whether we should store the symbol name in the
- output .debug section. */
- if (name != NULL)
- {
- bfd_size_type indx;
- indx = _bfd_stringtab_add (debug_strtab, name, true, true);
- if (indx == (bfd_size_type) -1)
- goto error_return;
- *debug_index = indx;
- }
- else
- *debug_index = -1;
- if (*sym_hash != 0)
- (*sym_hash)->flags |= XCOFF_ALLOCATED;
- if (*lineno_counts > 0)
- csect->output_section->lineno_count += *lineno_counts;
- }
- esym += (sym.n_numaux + 1) * symesz;
- csectpp += sym.n_numaux + 1;
- sym_hash += sym.n_numaux + 1;
- lineno_counts += sym.n_numaux + 1;
- debug_index += sym.n_numaux + 1;
- }
- if (debug_contents)
- {
- free (debug_contents);
- debug_contents = NULL;
- /* Clear the size of subdeb, so that it is not included directly
- in the output file. */
- subdeb->size = 0;
- }
- if (! info->keep_memory)
- {
- if (! _bfd_coff_free_symbols (sub))
- goto error_return;
- }
- }
- if (info->strip != strip_all
- && xcoff_hash_table (info)->debug_section != NULL)
- xcoff_hash_table (info)->debug_section->size =
- _bfd_stringtab_size (debug_strtab);
- return true;
- error_return:
- free (ldinfo.strings);
- free (debug_contents);
- return false;
- }
- bool
- bfd_xcoff_link_generate_rtinit (bfd *abfd,
- const char *init,
- const char *fini,
- bool rtld)
- {
- struct bfd_in_memory *bim;
- bim = bfd_malloc ((bfd_size_type) sizeof (* bim));
- if (bim == NULL)
- return false;
- bim->size = 0;
- bim->buffer = 0;
- abfd->link.next = 0;
- abfd->format = bfd_object;
- abfd->iostream = (void *) bim;
- abfd->flags = BFD_IN_MEMORY;
- abfd->iovec = &_bfd_memory_iovec;
- abfd->direction = write_direction;
- abfd->origin = 0;
- abfd->where = 0;
- if (! bfd_xcoff_generate_rtinit (abfd, init, fini, rtld))
- return false;
- /* need to reset to unknown or it will not be read back in correctly */
- abfd->format = bfd_unknown;
- abfd->direction = read_direction;
- abfd->where = 0;
- return true;
- }
- /* Return the section that defines H. Return null if no section does. */
- static asection *
- xcoff_symbol_section (struct xcoff_link_hash_entry *h)
- {
- switch (h->root.type)
- {
- case bfd_link_hash_defined:
- case bfd_link_hash_defweak:
- return h->root.u.def.section;
- case bfd_link_hash_common:
- return h->root.u.c.p->section;
- default:
- return NULL;
- }
- }
- /* Add a .loader relocation for input relocation IREL. If the loader
- relocation should be against an output section, HSEC points to the
- input section that IREL is against, otherwise HSEC is null. H is the
- symbol that IREL is against, or null if it isn't against a global symbol.
- REFERENCE_BFD is the bfd to use in error messages about the relocation. */
- static bool
- xcoff_create_ldrel (bfd *output_bfd, struct xcoff_final_link_info *flinfo,
- asection *output_section, bfd *reference_bfd,
- struct internal_reloc *irel, asection *hsec,
- struct xcoff_link_hash_entry *h)
- {
- struct internal_ldrel ldrel;
- ldrel.l_vaddr = irel->r_vaddr;
- if (hsec != NULL)
- {
- const char *secname;
- secname = hsec->output_section->name;
- if (strcmp (secname, ".text") == 0)
- ldrel.l_symndx = 0;
- else if (strcmp (secname, ".data") == 0)
- ldrel.l_symndx = 1;
- else if (strcmp (secname, ".bss") == 0)
- ldrel.l_symndx = 2;
- else if (strcmp (secname, ".tdata") == 0)
- ldrel.l_symndx = -1;
- else if (strcmp (secname, ".tbss") == 0)
- ldrel.l_symndx = -2;
- else
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: loader reloc in unrecognized section `%s'"),
- reference_bfd, secname);
- bfd_set_error (bfd_error_nonrepresentable_section);
- return false;
- }
- }
- else if (h != NULL)
- {
- if (h->ldindx < 0)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: `%s' in loader reloc but not loader sym"),
- reference_bfd, h->root.root.string);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- ldrel.l_symndx = h->ldindx;
- }
- else
- ldrel.l_symndx = -(bfd_size_type) 1;
- ldrel.l_rtype = (irel->r_size << 8) | irel->r_type;
- ldrel.l_rsecnm = output_section->target_index;
- if (xcoff_hash_table (flinfo->info)->textro
- && strcmp (output_section->name, ".text") == 0)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: loader reloc in read-only section %pA"),
- reference_bfd, output_section);
- bfd_set_error (bfd_error_invalid_operation);
- return false;
- }
- bfd_xcoff_swap_ldrel_out (output_bfd, &ldrel, flinfo->ldrel);
- flinfo->ldrel += bfd_xcoff_ldrelsz (output_bfd);
- return true;
- }
- /* Link an input file into the linker output file. This function
- handles all the sections and relocations of the input file at once. */
- static bool
- xcoff_link_input_bfd (struct xcoff_final_link_info *flinfo,
- bfd *input_bfd)
- {
- bfd *output_bfd;
- const char *strings;
- bfd_size_type syment_base;
- unsigned int n_tmask;
- unsigned int n_btshft;
- bool copy, hash;
- bfd_size_type isymesz;
- bfd_size_type osymesz;
- bfd_size_type linesz;
- bfd_byte *esym;
- bfd_byte *esym_end;
- struct xcoff_link_hash_entry **sym_hash;
- struct internal_syment *isymp;
- asection **csectpp;
- unsigned int *lineno_counts;
- long *debug_index;
- long *indexp;
- unsigned long output_index;
- bfd_byte *outsym;
- unsigned int incls;
- asection *oline;
- bool keep_syms;
- asection *o;
- /* We can just skip DYNAMIC files, unless this is a static link. */
- if ((input_bfd->flags & DYNAMIC) != 0
- && ! flinfo->info->static_link)
- return true;
- /* Move all the symbols to the output file. */
- output_bfd = flinfo->output_bfd;
- strings = NULL;
- syment_base = obj_raw_syment_count (output_bfd);
- isymesz = bfd_coff_symesz (input_bfd);
- osymesz = bfd_coff_symesz (output_bfd);
- linesz = bfd_coff_linesz (input_bfd);
- BFD_ASSERT (linesz == bfd_coff_linesz (output_bfd));
- n_tmask = coff_data (input_bfd)->local_n_tmask;
- n_btshft = coff_data (input_bfd)->local_n_btshft;
- /* Define macros so that ISFCN, et. al., macros work correctly. */
- #define N_TMASK n_tmask
- #define N_BTSHFT n_btshft
- copy = false;
- if (! flinfo->info->keep_memory)
- copy = true;
- hash = true;
- if (flinfo->info->traditional_format)
- hash = false;
- if (! _bfd_coff_get_external_symbols (input_bfd))
- return false;
- /* Make one pass over the symbols and assign indices to symbols that
- we have decided to keep. Also use create .loader symbol information
- and update information in hash table entries. */
- esym = (bfd_byte *) obj_coff_external_syms (input_bfd);
- esym_end = esym + obj_raw_syment_count (input_bfd) * isymesz;
- sym_hash = obj_xcoff_sym_hashes (input_bfd);
- csectpp = xcoff_data (input_bfd)->csects;
- debug_index = xcoff_data (input_bfd)->debug_indices;
- isymp = flinfo->internal_syms;
- indexp = flinfo->sym_indices;
- output_index = syment_base;
- while (esym < esym_end)
- {
- union internal_auxent aux;
- int smtyp = 0;
- int add;
- bfd_coff_swap_sym_in (input_bfd, (void *) esym, (void *) isymp);
- /* Read in the csect information, if any. */
- if (CSECT_SYM_P (isymp->n_sclass))
- {
- BFD_ASSERT (isymp->n_numaux > 0);
- bfd_coff_swap_aux_in (input_bfd,
- (void *) (esym + isymesz * isymp->n_numaux),
- isymp->n_type, isymp->n_sclass,
- isymp->n_numaux - 1, isymp->n_numaux,
- (void *) &aux);
- smtyp = SMTYP_SMTYP (aux.x_csect.x_smtyp);
- }
- /* If this symbol is in the .loader section, swap out the
- .loader symbol information. If this is an external symbol
- reference to a defined symbol, though, then wait until we get
- to the definition. */
- if (EXTERN_SYM_P (isymp->n_sclass)
- && *sym_hash != NULL
- && (*sym_hash)->ldsym != NULL
- && xcoff_final_definition_p (input_bfd, *sym_hash, *csectpp))
- {
- struct xcoff_link_hash_entry *h;
- struct internal_ldsym *ldsym;
- h = *sym_hash;
- ldsym = h->ldsym;
- if (isymp->n_scnum > 0)
- {
- ldsym->l_scnum = (*csectpp)->output_section->target_index;
- ldsym->l_value = (isymp->n_value
- + (*csectpp)->output_section->vma
- + (*csectpp)->output_offset
- - (*csectpp)->vma);
- }
- else
- {
- ldsym->l_scnum = isymp->n_scnum;
- ldsym->l_value = isymp->n_value;
- }
- ldsym->l_smtype = smtyp;
- if (((h->flags & XCOFF_DEF_REGULAR) == 0
- && (h->flags & XCOFF_DEF_DYNAMIC) != 0)
- || (h->flags & XCOFF_IMPORT) != 0)
- ldsym->l_smtype |= L_IMPORT;
- if (((h->flags & XCOFF_DEF_REGULAR) != 0
- && (h->flags & XCOFF_DEF_DYNAMIC) != 0)
- || (h->flags & XCOFF_EXPORT) != 0)
- ldsym->l_smtype |= L_EXPORT;
- if ((h->flags & XCOFF_ENTRY) != 0)
- ldsym->l_smtype |= L_ENTRY;
- if (isymp->n_sclass == C_AIX_WEAKEXT)
- ldsym->l_smtype |= L_WEAK;
- ldsym->l_smclas = aux.x_csect.x_smclas;
- if (ldsym->l_ifile == (bfd_size_type) -1)
- ldsym->l_ifile = 0;
- else if (ldsym->l_ifile == 0)
- {
- if ((ldsym->l_smtype & L_IMPORT) == 0)
- ldsym->l_ifile = 0;
- else
- {
- bfd *impbfd;
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- impbfd = h->root.u.def.section->owner;
- else if (h->root.type == bfd_link_hash_undefined
- || h->root.type == bfd_link_hash_undefweak)
- impbfd = h->root.u.undef.abfd;
- else
- impbfd = NULL;
- if (impbfd == NULL)
- ldsym->l_ifile = 0;
- else
- {
- BFD_ASSERT (impbfd->xvec == flinfo->output_bfd->xvec);
- ldsym->l_ifile = xcoff_data (impbfd)->import_file_id;
- }
- }
- }
- ldsym->l_parm = 0;
- BFD_ASSERT (h->ldindx >= 0);
- bfd_xcoff_swap_ldsym_out (flinfo->output_bfd, ldsym,
- (flinfo->ldsym
- + ((h->ldindx - 3)
- * bfd_xcoff_ldsymsz (flinfo->output_bfd))));
- h->ldsym = NULL;
- /* Fill in snentry now that we know the target_index. */
- if ((h->flags & XCOFF_ENTRY) != 0
- && (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak))
- {
- xcoff_data (output_bfd)->snentry =
- h->root.u.def.section->output_section->target_index;
- }
- }
- add = 1 + isymp->n_numaux;
- if (*debug_index == -2)
- /* We've decided to strip this symbol. */
- *indexp = -1;
- else
- {
- /* Assign the next unused index to this symbol. */
- *indexp = output_index;
- if (EXTERN_SYM_P (isymp->n_sclass))
- {
- BFD_ASSERT (*sym_hash != NULL);
- (*sym_hash)->indx = output_index;
- }
- /* If this is a symbol in the TOC which we may have merged
- (class XMC_TC), remember the symbol index of the TOC
- symbol. */
- if (isymp->n_sclass == C_HIDEXT
- && aux.x_csect.x_smclas == XMC_TC
- && *sym_hash != NULL)
- {
- BFD_ASSERT (((*sym_hash)->flags & XCOFF_SET_TOC) == 0);
- BFD_ASSERT ((*sym_hash)->toc_section != NULL);
- (*sym_hash)->u.toc_indx = output_index;
- }
- output_index += add;
- }
- esym += add * isymesz;
- isymp += add;
- csectpp += add;
- sym_hash += add;
- debug_index += add;
- ++indexp;
- for (--add; add > 0; --add)
- *indexp++ = -1;
- }
- /* Now write out the symbols that we decided to keep. */
- esym = (bfd_byte *) obj_coff_external_syms (input_bfd);
- esym_end = esym + obj_raw_syment_count (input_bfd) * isymesz;
- sym_hash = obj_xcoff_sym_hashes (input_bfd);
- isymp = flinfo->internal_syms;
- indexp = flinfo->sym_indices;
- csectpp = xcoff_data (input_bfd)->csects;
- lineno_counts = xcoff_data (input_bfd)->lineno_counts;
- debug_index = xcoff_data (input_bfd)->debug_indices;
- outsym = flinfo->outsyms;
- incls = 0;
- oline = NULL;
- while (esym < esym_end)
- {
- int add;
- add = 1 + isymp->n_numaux;
- if (*indexp < 0)
- esym += add * isymesz;
- else
- {
- struct internal_syment isym;
- int i;
- /* Adjust the symbol in order to output it. */
- isym = *isymp;
- if (isym._n._n_n._n_zeroes == 0
- && isym._n._n_n._n_offset != 0)
- {
- /* This symbol has a long name. Enter it in the string
- table we are building. If *debug_index != -1, the
- name has already been entered in the .debug section. */
- if (*debug_index >= 0)
- isym._n._n_n._n_offset = *debug_index;
- else
- {
- const char *name;
- bfd_size_type indx;
- name = _bfd_coff_internal_syment_name (input_bfd, &isym, NULL);
- if (name == NULL)
- return false;
- indx = _bfd_stringtab_add (flinfo->strtab, name, hash, copy);
- if (indx == (bfd_size_type) -1)
- return false;
- isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
- }
- }
- /* Make __rtinit C_HIDEXT rather than C_EXT. This avoids
- multiple definition problems when linking a shared object
- statically. (The native linker doesn't enter __rtinit into
- the normal table at all, but having a local symbol can make
- the objdump output easier to read.) */
- if (isym.n_sclass == C_EXT
- && *sym_hash
- && ((*sym_hash)->flags & XCOFF_RTINIT) != 0)
- isym.n_sclass = C_HIDEXT;
- /* The value of a C_FILE symbol is the symbol index of the
- next C_FILE symbol. The value of the last C_FILE symbol
- is -1. We try to get this right, below, just before we
- write the symbols out, but in the general case we may
- have to write the symbol out twice. */
- if (isym.n_sclass == C_FILE)
- {
- if (flinfo->last_file_index != -1
- && flinfo->last_file.n_value != (bfd_vma) *indexp)
- {
- /* We must correct the value of the last C_FILE entry. */
- flinfo->last_file.n_value = *indexp;
- if ((bfd_size_type) flinfo->last_file_index >= syment_base)
- {
- /* The last C_FILE symbol is in this input file. */
- bfd_coff_swap_sym_out (output_bfd,
- (void *) &flinfo->last_file,
- (void *) (flinfo->outsyms
- + ((flinfo->last_file_index
- - syment_base)
- * osymesz)));
- }
- else
- {
- /* We have already written out the last C_FILE
- symbol. We need to write it out again. We
- borrow *outsym temporarily. */
- file_ptr pos;
- bfd_coff_swap_sym_out (output_bfd,
- (void *) &flinfo->last_file,
- (void *) outsym);
- pos = obj_sym_filepos (output_bfd);
- pos += flinfo->last_file_index * osymesz;
- if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
- || (bfd_bwrite (outsym, osymesz, output_bfd)
- != osymesz))
- return false;
- }
- }
- flinfo->last_file_index = *indexp;
- flinfo->last_file = isym;
- }
- /* The value of a C_BINCL or C_EINCL symbol is a file offset
- into the line numbers. We update the symbol values when
- we handle the line numbers. */
- if (isym.n_sclass == C_BINCL
- || isym.n_sclass == C_EINCL)
- {
- isym.n_value = flinfo->line_filepos;
- ++incls;
- }
- /* The value of a C_BSTAT symbol is the symbol table
- index of the containing csect. */
- else if (isym.n_sclass == C_BSTAT)
- {
- bfd_vma indx;
- indx = isym.n_value;
- if (indx < obj_raw_syment_count (input_bfd))
- {
- long symindx;
- symindx = flinfo->sym_indices[indx];
- if (symindx < 0)
- isym.n_value = 0;
- else
- isym.n_value = symindx;
- }
- }
- else if (isym.n_sclass != C_ESTAT
- && isym.n_sclass != C_DECL
- && isym.n_scnum > 0)
- {
- isym.n_scnum = (*csectpp)->output_section->target_index;
- isym.n_value += ((*csectpp)->output_section->vma
- + (*csectpp)->output_offset
- - (*csectpp)->vma);
- }
- /* Update visibility. */
- if (*sym_hash)
- {
- isym.n_type &= ~SYM_V_MASK;
- isym.n_type |= (*sym_hash)->visibility;
- }
- /* Output the symbol. */
- bfd_coff_swap_sym_out (output_bfd, (void *) &isym, (void *) outsym);
- esym += isymesz;
- outsym += osymesz;
- for (i = 0; i < isymp->n_numaux && esym < esym_end; i++)
- {
- union internal_auxent aux;
- bfd_coff_swap_aux_in (input_bfd, (void *) esym, isymp->n_type,
- isymp->n_sclass, i, isymp->n_numaux,
- (void *) &aux);
- if (isymp->n_sclass == C_FILE)
- {
- /* This is the file name (or some comment put in by
- the compiler). If it is long, we must put it in
- the string table. */
- if (aux.x_file.x_n.x_n.x_zeroes == 0
- && aux.x_file.x_n.x_n.x_offset != 0)
- {
- const char *filename;
- bfd_size_type indx;
- BFD_ASSERT (aux.x_file.x_n.x_n.x_offset
- >= STRING_SIZE_SIZE);
- if (strings == NULL)
- {
- strings = _bfd_coff_read_string_table (input_bfd);
- if (strings == NULL)
- return false;
- }
- if ((bfd_size_type) aux.x_file.x_n.x_n.x_offset >= obj_coff_strings_len (input_bfd))
- filename = _("<corrupt>");
- else
- filename = strings + aux.x_file.x_n.x_n.x_offset;
- indx = _bfd_stringtab_add (flinfo->strtab, filename,
- hash, copy);
- if (indx == (bfd_size_type) -1)
- return false;
- aux.x_file.x_n.x_n.x_offset = STRING_SIZE_SIZE + indx;
- }
- }
- else if (CSECT_SYM_P (isymp->n_sclass)
- && i + 1 == isymp->n_numaux)
- {
- /* We don't support type checking. I don't know if
- anybody does. */
- aux.x_csect.x_parmhash = 0;
- /* I don't think anybody uses these fields, but we'd
- better clobber them just in case. */
- aux.x_csect.x_stab = 0;
- aux.x_csect.x_snstab = 0;
- if (SMTYP_SMTYP (aux.x_csect.x_smtyp) == XTY_LD)
- {
- unsigned long indx;
- indx = aux.x_csect.x_scnlen.l;
- if (indx < obj_raw_syment_count (input_bfd))
- {
- long symindx;
- symindx = flinfo->sym_indices[indx];
- if (symindx < 0)
- {
- aux.x_csect.x_scnlen.l = 0;
- }
- else
- {
- aux.x_csect.x_scnlen.l = symindx;
- }
- }
- }
- }
- else if (isymp->n_sclass != C_STAT || isymp->n_type != T_NULL)
- {
- unsigned long indx;
- if (ISFCN (isymp->n_type)
- || ISTAG (isymp->n_sclass)
- || isymp->n_sclass == C_BLOCK
- || isymp->n_sclass == C_FCN)
- {
- indx = aux.x_sym.x_fcnary.x_fcn.x_endndx.l;
- if (indx > 0
- && indx < obj_raw_syment_count (input_bfd))
- {
- /* We look forward through the symbol for
- the index of the next symbol we are going
- to include. I don't know if this is
- entirely right. */
- while (flinfo->sym_indices[indx] < 0
- && indx < obj_raw_syment_count (input_bfd))
- ++indx;
- if (indx >= obj_raw_syment_count (input_bfd))
- indx = output_index;
- else
- indx = flinfo->sym_indices[indx];
- aux.x_sym.x_fcnary.x_fcn.x_endndx.l = indx;
- }
- }
- indx = aux.x_sym.x_tagndx.l;
- if (indx > 0 && indx < obj_raw_syment_count (input_bfd))
- {
- long symindx;
- symindx = flinfo->sym_indices[indx];
- if (symindx < 0)
- aux.x_sym.x_tagndx.l = 0;
- else
- aux.x_sym.x_tagndx.l = symindx;
- }
- }
- /* Copy over the line numbers, unless we are stripping
- them. We do this on a symbol by symbol basis in
- order to more easily handle garbage collection. */
- if (CSECT_SYM_P (isymp->n_sclass)
- && i == 0
- && isymp->n_numaux > 1
- && ISFCN (isymp->n_type)
- && aux.x_sym.x_fcnary.x_fcn.x_lnnoptr != 0)
- {
- if (*lineno_counts == 0)
- aux.x_sym.x_fcnary.x_fcn.x_lnnoptr = 0;
- else
- {
- asection *enclosing;
- unsigned int enc_count;
- bfd_signed_vma linoff;
- struct internal_lineno lin;
- bfd_byte *linp;
- bfd_byte *linpend;
- bfd_vma offset;
- file_ptr pos;
- bfd_size_type amt;
- /* Read in the enclosing section's line-number
- information, if we haven't already. */
- o = *csectpp;
- enclosing = xcoff_section_data (abfd, o)->enclosing;
- enc_count = xcoff_section_data (abfd, o)->lineno_count;
- if (oline != enclosing)
- {
- pos = enclosing->line_filepos;
- amt = linesz * enc_count;
- if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
- || (bfd_bread (flinfo->linenos, amt, input_bfd)
- != amt))
- return false;
- oline = enclosing;
- }
- /* Copy across the first entry, adjusting its
- symbol index. */
- linoff = (aux.x_sym.x_fcnary.x_fcn.x_lnnoptr
- - enclosing->line_filepos);
- linp = flinfo->linenos + linoff;
- bfd_coff_swap_lineno_in (input_bfd, linp, &lin);
- lin.l_addr.l_symndx = *indexp;
- bfd_coff_swap_lineno_out (output_bfd, &lin, linp);
- /* Copy the other entries, adjusting their addresses. */
- linpend = linp + *lineno_counts * linesz;
- offset = (o->output_section->vma
- + o->output_offset
- - o->vma);
- for (linp += linesz; linp < linpend; linp += linesz)
- {
- bfd_coff_swap_lineno_in (input_bfd, linp, &lin);
- lin.l_addr.l_paddr += offset;
- bfd_coff_swap_lineno_out (output_bfd, &lin, linp);
- }
- /* Write out the entries we've just processed. */
- pos = (o->output_section->line_filepos
- + o->output_section->lineno_count * linesz);
- amt = linesz * *lineno_counts;
- if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
- || bfd_bwrite (flinfo->linenos + linoff,
- amt, output_bfd) != amt)
- return false;
- o->output_section->lineno_count += *lineno_counts;
- /* Record the offset of the symbol's line numbers
- in the output file. */
- aux.x_sym.x_fcnary.x_fcn.x_lnnoptr = pos;
- if (incls > 0)
- {
- struct internal_syment *iisp, *iispend;
- long *iindp;
- bfd_byte *oos;
- bfd_vma range_start, range_end;
- int iiadd;
- /* Update any C_BINCL or C_EINCL symbols
- that refer to a line number in the
- range we just output. */
- iisp = flinfo->internal_syms;
- iispend = iisp + obj_raw_syment_count (input_bfd);
- iindp = flinfo->sym_indices;
- oos = flinfo->outsyms;
- range_start = enclosing->line_filepos + linoff;
- range_end = range_start + *lineno_counts * linesz;
- while (iisp < iispend)
- {
- if (*iindp >= 0
- && (iisp->n_sclass == C_BINCL
- || iisp->n_sclass == C_EINCL)
- && iisp->n_value >= range_start
- && iisp->n_value < range_end)
- {
- struct internal_syment iis;
- bfd_coff_swap_sym_in (output_bfd, oos, &iis);
- iis.n_value = (iisp->n_value
- - range_start
- + pos);
- bfd_coff_swap_sym_out (output_bfd,
- &iis, oos);
- --incls;
- }
- iiadd = 1 + iisp->n_numaux;
- if (*iindp >= 0)
- oos += iiadd * osymesz;
- iisp += iiadd;
- iindp += iiadd;
- }
- }
- }
- }
- bfd_coff_swap_aux_out (output_bfd, (void *) &aux, isymp->n_type,
- isymp->n_sclass, i, isymp->n_numaux,
- (void *) outsym);
- outsym += osymesz;
- esym += isymesz;
- }
- }
- sym_hash += add;
- indexp += add;
- isymp += add;
- csectpp += add;
- lineno_counts += add;
- debug_index += add;
- }
- /* If we swapped out a C_FILE symbol, guess that the next C_FILE
- symbol will be the first symbol in the next input file. In the
- normal case, this will save us from writing out the C_FILE symbol
- again. */
- if (flinfo->last_file_index != -1
- && (bfd_size_type) flinfo->last_file_index >= syment_base)
- {
- flinfo->last_file.n_value = output_index;
- bfd_coff_swap_sym_out (output_bfd, (void *) &flinfo->last_file,
- (void *) (flinfo->outsyms
- + ((flinfo->last_file_index - syment_base)
- * osymesz)));
- }
- /* Write the modified symbols to the output file. */
- if (outsym > flinfo->outsyms)
- {
- file_ptr pos = obj_sym_filepos (output_bfd) + syment_base * osymesz;
- bfd_size_type amt = outsym - flinfo->outsyms;
- if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
- || bfd_bwrite (flinfo->outsyms, amt, output_bfd) != amt)
- return false;
- BFD_ASSERT ((obj_raw_syment_count (output_bfd)
- + (outsym - flinfo->outsyms) / osymesz)
- == output_index);
- obj_raw_syment_count (output_bfd) = output_index;
- }
- /* Don't let the linker relocation routines discard the symbols. */
- keep_syms = obj_coff_keep_syms (input_bfd);
- obj_coff_keep_syms (input_bfd) = true;
- /* Relocate the contents of each section. */
- for (o = input_bfd->sections; o != NULL; o = o->next)
- {
- bfd_byte *contents;
- if (! o->linker_mark)
- /* This section was omitted from the link. */
- continue;
- if ((o->flags & SEC_HAS_CONTENTS) == 0
- || o->size == 0
- || (o->flags & SEC_IN_MEMORY) != 0)
- continue;
- /* We have set filepos correctly for the sections we created to
- represent csects, so bfd_get_section_contents should work. */
- if (coff_section_data (input_bfd, o) != NULL
- && coff_section_data (input_bfd, o)->contents != NULL)
- contents = coff_section_data (input_bfd, o)->contents;
- else
- {
- bfd_size_type sz = o->rawsize ? o->rawsize : o->size;
- if (!bfd_get_section_contents (input_bfd, o, flinfo->contents, 0, sz))
- goto err_out;
- contents = flinfo->contents;
- }
- if ((o->flags & SEC_RELOC) != 0)
- {
- int target_index;
- struct internal_reloc *internal_relocs;
- struct internal_reloc *irel;
- bfd_vma offset;
- struct internal_reloc *irelend;
- struct xcoff_link_hash_entry **rel_hash;
- long r_symndx;
- /* Read in the relocs. */
- target_index = o->output_section->target_index;
- internal_relocs = (xcoff_read_internal_relocs
- (input_bfd, o, false, flinfo->external_relocs,
- true,
- (flinfo->section_info[target_index].relocs
- + o->output_section->reloc_count)));
- if (internal_relocs == NULL)
- goto err_out;
- /* Call processor specific code to relocate the section
- contents. */
- if (! bfd_coff_relocate_section (output_bfd, flinfo->info,
- input_bfd, o,
- contents,
- internal_relocs,
- flinfo->internal_syms,
- xcoff_data (input_bfd)->csects))
- goto err_out;
- offset = o->output_section->vma + o->output_offset - o->vma;
- irel = internal_relocs;
- irelend = irel + o->reloc_count;
- rel_hash = (flinfo->section_info[target_index].rel_hashes
- + o->output_section->reloc_count);
- for (; irel < irelend; irel++, rel_hash++)
- {
- struct xcoff_link_hash_entry *h = NULL;
- *rel_hash = NULL;
- /* Adjust the reloc address and symbol index. */
- irel->r_vaddr += offset;
- r_symndx = irel->r_symndx;
- if (r_symndx == -1)
- h = NULL;
- else
- h = obj_xcoff_sym_hashes (input_bfd)[r_symndx];
- if (r_symndx != -1 && flinfo->info->strip != strip_all)
- {
- if (h != NULL
- && h->smclas != XMC_TD
- && (irel->r_type == R_TOC
- || irel->r_type == R_GL
- || irel->r_type == R_TCL
- || irel->r_type == R_TRL
- || irel->r_type == R_TRLA))
- {
- /* This is a TOC relative reloc with a symbol
- attached. The symbol should be the one which
- this reloc is for. We want to make this
- reloc against the TOC address of the symbol,
- not the symbol itself. */
- BFD_ASSERT (h->toc_section != NULL);
- BFD_ASSERT ((h->flags & XCOFF_SET_TOC) == 0);
- if (h->u.toc_indx != -1)
- irel->r_symndx = h->u.toc_indx;
- else
- {
- struct xcoff_toc_rel_hash *n;
- struct xcoff_link_section_info *si;
- size_t amt;
- amt = sizeof (* n);
- n = bfd_alloc (flinfo->output_bfd, amt);
- if (n == NULL)
- goto err_out;
- si = flinfo->section_info + target_index;
- n->next = si->toc_rel_hashes;
- n->h = h;
- n->rel = irel;
- si->toc_rel_hashes = n;
- }
- }
- else if (h != NULL)
- {
- /* This is a global symbol. */
- if (h->indx >= 0)
- irel->r_symndx = h->indx;
- else
- {
- /* This symbol is being written at the end
- of the file, and we do not yet know the
- symbol index. We save the pointer to the
- hash table entry in the rel_hash list.
- We set the indx field to -2 to indicate
- that this symbol must not be stripped. */
- *rel_hash = h;
- h->indx = -2;
- }
- }
- else
- {
- long indx;
- indx = flinfo->sym_indices[r_symndx];
- if (indx == -1)
- {
- struct internal_syment *is;
- /* Relocations against a TC0 TOC anchor are
- automatically transformed to be against
- the TOC anchor in the output file. */
- is = flinfo->internal_syms + r_symndx;
- if (is->n_sclass == C_HIDEXT
- && is->n_numaux > 0)
- {
- void * auxptr;
- union internal_auxent aux;
- auxptr = ((void *)
- (((bfd_byte *)
- obj_coff_external_syms (input_bfd))
- + ((r_symndx + is->n_numaux)
- * isymesz)));
- bfd_coff_swap_aux_in (input_bfd, auxptr,
- is->n_type, is->n_sclass,
- is->n_numaux - 1,
- is->n_numaux,
- (void *) &aux);
- if (SMTYP_SMTYP (aux.x_csect.x_smtyp) == XTY_SD
- && aux.x_csect.x_smclas == XMC_TC0)
- indx = flinfo->toc_symindx;
- }
- }
- if (indx != -1)
- irel->r_symndx = indx;
- else
- {
- struct internal_syment *is;
- const char *name;
- char buf[SYMNMLEN + 1];
- /* This reloc is against a symbol we are
- stripping. It would be possible to handle
- this case, but I don't think it's worth it. */
- is = flinfo->internal_syms + r_symndx;
- if (is->n_sclass != C_DWARF)
- {
- name = (_bfd_coff_internal_syment_name
- (input_bfd, is, buf));
- if (name == NULL)
- goto err_out;
- (*flinfo->info->callbacks->unattached_reloc)
- (flinfo->info, name,
- input_bfd, o, irel->r_vaddr);
- }
- }
- }
- }
- if ((o->flags & SEC_DEBUGGING) == 0
- && xcoff_need_ldrel_p (flinfo->info, irel, h, o))
- {
- asection *sec;
- if (r_symndx == -1)
- sec = NULL;
- else if (h == NULL)
- sec = xcoff_data (input_bfd)->csects[r_symndx];
- else
- sec = xcoff_symbol_section (h);
- if (!xcoff_create_ldrel (output_bfd, flinfo,
- o->output_section, input_bfd,
- irel, sec, h))
- goto err_out;
- }
- }
- o->output_section->reloc_count += o->reloc_count;
- }
- /* Write out the modified section contents. */
- if (! bfd_set_section_contents (output_bfd, o->output_section,
- contents, (file_ptr) o->output_offset,
- o->size))
- goto err_out;
- }
- obj_coff_keep_syms (input_bfd) = keep_syms;
- if (! flinfo->info->keep_memory)
- {
- if (! _bfd_coff_free_symbols (input_bfd))
- return false;
- }
- return true;
- err_out:
- obj_coff_keep_syms (input_bfd) = keep_syms;
- return false;
- }
- #undef N_TMASK
- #undef N_BTSHFT
- /* Sort relocs by VMA. This is called via qsort. */
- static int
- xcoff_sort_relocs (const void * p1, const void * p2)
- {
- const struct internal_reloc *r1 = (const struct internal_reloc *) p1;
- const struct internal_reloc *r2 = (const struct internal_reloc *) p2;
- if (r1->r_vaddr > r2->r_vaddr)
- return 1;
- else if (r1->r_vaddr < r2->r_vaddr)
- return -1;
- else
- return 0;
- }
- /* Return true if section SEC is a TOC section. */
- static inline bool
- xcoff_toc_section_p (asection *sec)
- {
- const char *name;
- name = sec->name;
- if (name[0] == '.' && name[1] == 't')
- {
- if (name[2] == 'c')
- {
- if (name[3] == '0' && name[4] == 0)
- return true;
- if (name[3] == 0)
- return true;
- }
- if (name[2] == 'd' && name[3] == 0)
- return true;
- }
- return false;
- }
- /* See if the link requires a TOC (it usually does!). If so, find a
- good place to put the TOC anchor csect, and write out the associated
- symbol. */
- static bool
- xcoff_find_tc0 (bfd *output_bfd, struct xcoff_final_link_info *flinfo)
- {
- bfd_vma toc_start, toc_end, start, end, best_address;
- asection *sec;
- bfd *input_bfd;
- int section_index;
- struct internal_syment irsym;
- union internal_auxent iraux;
- file_ptr pos;
- size_t size;
- /* Set [TOC_START, TOC_END) to the range of the TOC. Record the
- index of a csect at the beginning of the TOC. */
- toc_start = ~(bfd_vma) 0;
- toc_end = 0;
- section_index = -1;
- for (input_bfd = flinfo->info->input_bfds;
- input_bfd != NULL;
- input_bfd = input_bfd->link.next)
- for (sec = input_bfd->sections; sec != NULL; sec = sec->next)
- if (sec->gc_mark != 0 && xcoff_toc_section_p (sec))
- {
- start = sec->output_section->vma + sec->output_offset;
- if (toc_start > start)
- {
- toc_start = start;
- section_index = sec->output_section->target_index;
- }
- end = start + sec->size;
- if (toc_end < end)
- toc_end = end;
- }
- /* There's no need for a TC0 symbol if we don't have a TOC. */
- if (toc_end < toc_start)
- {
- xcoff_data (output_bfd)->toc = toc_start;
- return true;
- }
- if (toc_end - toc_start < 0x8000)
- /* Every TOC csect can be accessed from TOC_START. */
- best_address = toc_start;
- else
- {
- /* Find the lowest TOC csect that is still within range of TOC_END. */
- best_address = toc_end;
- for (input_bfd = flinfo->info->input_bfds;
- input_bfd != NULL;
- input_bfd = input_bfd->link.next)
- for (sec = input_bfd->sections; sec != NULL; sec = sec->next)
- if (sec->gc_mark != 0 && xcoff_toc_section_p (sec))
- {
- start = sec->output_section->vma + sec->output_offset;
- if (start < best_address
- && start + 0x8000 >= toc_end)
- {
- best_address = start;
- section_index = sec->output_section->target_index;
- }
- }
- /* Make sure that the start of the TOC is also within range. */
- if (best_address > toc_start + 0x8000)
- {
- _bfd_error_handler
- (_("TOC overflow: %#" PRIx64 " > 0x10000; try -mminimal-toc "
- "when compiling"),
- (uint64_t) (toc_end - toc_start));
- bfd_set_error (bfd_error_file_too_big);
- return false;
- }
- }
- /* Record the chosen TOC value. */
- flinfo->toc_symindx = obj_raw_syment_count (output_bfd);
- xcoff_data (output_bfd)->toc = best_address;
- xcoff_data (output_bfd)->sntoc = section_index;
- /* Fill out the TC0 symbol. */
- if (!bfd_xcoff_put_symbol_name (output_bfd, flinfo->info, flinfo->strtab,
- &irsym, "TOC"))
- return false;
- irsym.n_value = best_address;
- irsym.n_scnum = section_index;
- irsym.n_sclass = C_HIDEXT;
- irsym.n_type = T_NULL;
- irsym.n_numaux = 1;
- bfd_coff_swap_sym_out (output_bfd, &irsym, flinfo->outsyms);
- /* Fill out the auxiliary csect information. */
- memset (&iraux, 0, sizeof iraux);
- iraux.x_csect.x_smtyp = XTY_SD;
- iraux.x_csect.x_smclas = XMC_TC0;
- iraux.x_csect.x_scnlen.l = 0;
- bfd_coff_swap_aux_out (output_bfd, &iraux, T_NULL, C_HIDEXT, 0, 1,
- flinfo->outsyms + bfd_coff_symesz (output_bfd));
- /* Write the contents to the file. */
- pos = obj_sym_filepos (output_bfd);
- pos += obj_raw_syment_count (output_bfd) * bfd_coff_symesz (output_bfd);
- size = 2 * bfd_coff_symesz (output_bfd);
- if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
- || bfd_bwrite (flinfo->outsyms, size, output_bfd) != size)
- return false;
- obj_raw_syment_count (output_bfd) += 2;
- return true;
- }
- /* Write out a non-XCOFF global symbol. */
- static bool
- xcoff_write_global_symbol (struct bfd_hash_entry *bh, void * inf)
- {
- struct xcoff_link_hash_entry *h = (struct xcoff_link_hash_entry *) bh;
- struct xcoff_final_link_info *flinfo = (struct xcoff_final_link_info *) inf;
- bfd *output_bfd;
- bfd_byte *outsym;
- struct internal_syment isym;
- union internal_auxent aux;
- bool result;
- file_ptr pos;
- bfd_size_type amt;
- output_bfd = flinfo->output_bfd;
- outsym = flinfo->outsyms;
- if (h->root.type == bfd_link_hash_warning)
- {
- h = (struct xcoff_link_hash_entry *) h->root.u.i.link;
- if (h->root.type == bfd_link_hash_new)
- return true;
- }
- /* If this symbol was garbage collected, just skip it. */
- if (xcoff_hash_table (flinfo->info)->gc
- && (h->flags & XCOFF_MARK) == 0)
- return true;
- /* If we need a .loader section entry, write it out. */
- if (h->ldsym != NULL)
- {
- struct internal_ldsym *ldsym;
- bfd *impbfd;
- ldsym = h->ldsym;
- if (h->root.type == bfd_link_hash_undefined
- || h->root.type == bfd_link_hash_undefweak)
- {
- ldsym->l_value = 0;
- ldsym->l_scnum = N_UNDEF;
- ldsym->l_smtype = XTY_ER;
- impbfd = h->root.u.undef.abfd;
- }
- else if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- asection *sec;
- sec = h->root.u.def.section;
- ldsym->l_value = (sec->output_section->vma
- + sec->output_offset
- + h->root.u.def.value);
- ldsym->l_scnum = sec->output_section->target_index;
- ldsym->l_smtype = XTY_SD;
- impbfd = sec->owner;
- }
- else
- abort ();
- if (((h->flags & XCOFF_DEF_REGULAR) == 0
- && (h->flags & XCOFF_DEF_DYNAMIC) != 0)
- || (h->flags & XCOFF_IMPORT) != 0)
- /* Clear l_smtype
- Import symbols are defined so the check above will make
- the l_smtype XTY_SD. But this is not correct, it should
- be cleared. */
- ldsym->l_smtype |= L_IMPORT;
- if (((h->flags & XCOFF_DEF_REGULAR) != 0
- && (h->flags & XCOFF_DEF_DYNAMIC) != 0)
- || (h->flags & XCOFF_EXPORT) != 0)
- ldsym->l_smtype |= L_EXPORT;
- if ((h->flags & XCOFF_ENTRY) != 0)
- ldsym->l_smtype |= L_ENTRY;
- if ((h->flags & XCOFF_RTINIT) != 0)
- ldsym->l_smtype = XTY_SD;
- ldsym->l_smclas = h->smclas;
- if (ldsym->l_smtype & L_IMPORT)
- {
- if ((h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && (h->root.u.def.value != 0))
- ldsym->l_smclas = XMC_XO;
- else if ((h->flags & (XCOFF_SYSCALL32 | XCOFF_SYSCALL64)) ==
- (XCOFF_SYSCALL32 | XCOFF_SYSCALL64))
- ldsym->l_smclas = XMC_SV3264;
- else if (h->flags & XCOFF_SYSCALL32)
- ldsym->l_smclas = XMC_SV;
- else if (h->flags & XCOFF_SYSCALL64)
- ldsym->l_smclas = XMC_SV64;
- }
- if (ldsym->l_ifile == -(bfd_size_type) 1)
- {
- ldsym->l_ifile = 0;
- }
- else if (ldsym->l_ifile == 0)
- {
- if ((ldsym->l_smtype & L_IMPORT) == 0)
- ldsym->l_ifile = 0;
- else if (impbfd == NULL)
- ldsym->l_ifile = 0;
- else
- {
- BFD_ASSERT (impbfd->xvec == output_bfd->xvec);
- ldsym->l_ifile = xcoff_data (impbfd)->import_file_id;
- }
- }
- ldsym->l_parm = 0;
- BFD_ASSERT (h->ldindx >= 0);
- bfd_xcoff_swap_ldsym_out (output_bfd, ldsym,
- (flinfo->ldsym +
- (h->ldindx - 3)
- * bfd_xcoff_ldsymsz(flinfo->output_bfd)));
- h->ldsym = NULL;
- }
- /* If this symbol needs global linkage code, write it out. */
- if (h->root.type == bfd_link_hash_defined
- && (h->root.u.def.section
- == xcoff_hash_table (flinfo->info)->linkage_section))
- {
- bfd_byte *p;
- bfd_vma tocoff;
- unsigned int i;
- p = h->root.u.def.section->contents + h->root.u.def.value;
- /* The first instruction in the global linkage code loads a
- specific TOC element. */
- tocoff = (h->descriptor->toc_section->output_section->vma
- + h->descriptor->toc_section->output_offset
- - xcoff_data (output_bfd)->toc);
- if ((h->descriptor->flags & XCOFF_SET_TOC) != 0)
- tocoff += h->descriptor->u.toc_offset;
- /* The first instruction in the glink code needs to be
- cooked to hold the correct offset in the toc. The
- rest are just output raw. */
- bfd_put_32 (output_bfd,
- bfd_xcoff_glink_code(output_bfd, 0) | (tocoff & 0xffff), p);
- /* Start with i == 1 to get past the first instruction done above
- The /4 is because the glink code is in bytes and we are going
- 4 at a pop. */
- for (i = 1; i < bfd_xcoff_glink_code_size(output_bfd) / 4; i++)
- bfd_put_32 (output_bfd,
- (bfd_vma) bfd_xcoff_glink_code(output_bfd, i),
- &p[4 * i]);
- }
- /* If we created a TOC entry for this symbol, write out the required
- relocs. */
- if ((h->flags & XCOFF_SET_TOC) != 0)
- {
- asection *tocsec;
- asection *osec;
- int oindx;
- struct internal_reloc *irel;
- struct internal_syment irsym;
- union internal_auxent iraux;
- tocsec = h->toc_section;
- osec = tocsec->output_section;
- oindx = osec->target_index;
- irel = flinfo->section_info[oindx].relocs + osec->reloc_count;
- irel->r_vaddr = (osec->vma
- + tocsec->output_offset
- + h->u.toc_offset);
- if (h->indx >= 0)
- irel->r_symndx = h->indx;
- else
- {
- h->indx = -2;
- irel->r_symndx = obj_raw_syment_count (output_bfd);
- }
- BFD_ASSERT (h->ldindx >= 0);
- /* Initialize the aux union here instead of closer to when it is
- written out below because the length of the csect depends on
- whether the output is 32 or 64 bit. */
- memset (&iraux, 0, sizeof iraux);
- iraux.x_csect.x_smtyp = XTY_SD;
- /* iraux.x_csect.x_scnlen.l = 4 or 8, see below. */
- iraux.x_csect.x_smclas = XMC_TC;
- /* 32 bit uses a 32 bit R_POS to do the relocations
- 64 bit uses a 64 bit R_POS to do the relocations
- Also needs to change the csect size : 4 for 32 bit, 8 for 64 bit
- Which one is determined by the backend. */
- if (bfd_xcoff_is_xcoff64 (output_bfd))
- {
- irel->r_size = 63;
- iraux.x_csect.x_scnlen.l = 8;
- }
- else if (bfd_xcoff_is_xcoff32 (output_bfd))
- {
- irel->r_size = 31;
- iraux.x_csect.x_scnlen.l = 4;
- }
- else
- return false;
- irel->r_type = R_POS;
- flinfo->section_info[oindx].rel_hashes[osec->reloc_count] = NULL;
- ++osec->reloc_count;
- if (!xcoff_create_ldrel (output_bfd, flinfo, osec,
- output_bfd, irel, NULL, h))
- return false;
- /* We need to emit a symbol to define a csect which holds
- the reloc. */
- if (flinfo->info->strip != strip_all)
- {
- result = bfd_xcoff_put_symbol_name (output_bfd, flinfo->info,
- flinfo->strtab,
- &irsym, h->root.root.string);
- if (!result)
- return false;
- irsym.n_value = irel->r_vaddr;
- irsym.n_scnum = osec->target_index;
- irsym.n_sclass = C_HIDEXT;
- irsym.n_type = T_NULL;
- irsym.n_numaux = 1;
- bfd_coff_swap_sym_out (output_bfd, (void *) &irsym, (void *) outsym);
- outsym += bfd_coff_symesz (output_bfd);
- /* Note : iraux is initialized above. */
- bfd_coff_swap_aux_out (output_bfd, (void *) &iraux, T_NULL, C_HIDEXT,
- 0, 1, (void *) outsym);
- outsym += bfd_coff_auxesz (output_bfd);
- if (h->indx >= 0)
- {
- /* We aren't going to write out the symbols below, so we
- need to write them out now. */
- pos = obj_sym_filepos (output_bfd);
- pos += (obj_raw_syment_count (output_bfd)
- * bfd_coff_symesz (output_bfd));
- amt = outsym - flinfo->outsyms;
- if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
- || bfd_bwrite (flinfo->outsyms, amt, output_bfd) != amt)
- return false;
- obj_raw_syment_count (output_bfd) +=
- (outsym - flinfo->outsyms) / bfd_coff_symesz (output_bfd);
- outsym = flinfo->outsyms;
- }
- }
- }
- /* If this symbol is a specially defined function descriptor, write
- it out. The first word is the address of the function code
- itself, the second word is the address of the TOC, and the third
- word is zero.
- 32 bit vs 64 bit
- The addresses for the 32 bit will take 4 bytes and the addresses
- for 64 bit will take 8 bytes. Similar for the relocs. This type
- of logic was also done above to create a TOC entry in
- xcoff_write_global_symbol. */
- if ((h->flags & XCOFF_DESCRIPTOR) != 0
- && h->root.type == bfd_link_hash_defined
- && (h->root.u.def.section
- == xcoff_hash_table (flinfo->info)->descriptor_section))
- {
- asection *sec;
- asection *osec;
- int oindx;
- bfd_byte *p;
- struct xcoff_link_hash_entry *hentry;
- asection *esec;
- struct internal_reloc *irel;
- asection *tsec;
- unsigned int reloc_size, byte_size;
- if (bfd_xcoff_is_xcoff64 (output_bfd))
- {
- reloc_size = 63;
- byte_size = 8;
- }
- else if (bfd_xcoff_is_xcoff32 (output_bfd))
- {
- reloc_size = 31;
- byte_size = 4;
- }
- else
- return false;
- sec = h->root.u.def.section;
- osec = sec->output_section;
- oindx = osec->target_index;
- p = sec->contents + h->root.u.def.value;
- hentry = h->descriptor;
- BFD_ASSERT (hentry != NULL
- && (hentry->root.type == bfd_link_hash_defined
- || hentry->root.type == bfd_link_hash_defweak));
- esec = hentry->root.u.def.section;
- irel = flinfo->section_info[oindx].relocs + osec->reloc_count;
- irel->r_vaddr = (osec->vma
- + sec->output_offset
- + h->root.u.def.value);
- irel->r_symndx = esec->output_section->target_index;
- irel->r_type = R_POS;
- irel->r_size = reloc_size;
- flinfo->section_info[oindx].rel_hashes[osec->reloc_count] = NULL;
- ++osec->reloc_count;
- if (!xcoff_create_ldrel (output_bfd, flinfo, osec,
- output_bfd, irel, esec, NULL))
- return false;
- /* There are three items to write out,
- the address of the code
- the address of the toc anchor
- the environment pointer.
- We are ignoring the environment pointer. So set it to zero. */
- if (bfd_xcoff_is_xcoff64 (output_bfd))
- {
- bfd_put_64 (output_bfd,
- (esec->output_section->vma + esec->output_offset
- + hentry->root.u.def.value),
- p);
- bfd_put_64 (output_bfd, xcoff_data (output_bfd)->toc, p + 8);
- bfd_put_64 (output_bfd, (bfd_vma) 0, p + 16);
- }
- else
- {
- /* 32 bit backend
- This logic was already called above so the error case where
- the backend is neither has already been checked. */
- bfd_put_32 (output_bfd,
- (esec->output_section->vma + esec->output_offset
- + hentry->root.u.def.value),
- p);
- bfd_put_32 (output_bfd, xcoff_data (output_bfd)->toc, p + 4);
- bfd_put_32 (output_bfd, (bfd_vma) 0, p + 8);
- }
- tsec = coff_section_from_bfd_index (output_bfd,
- xcoff_data (output_bfd)->sntoc);
- ++irel;
- irel->r_vaddr = (osec->vma
- + sec->output_offset
- + h->root.u.def.value
- + byte_size);
- irel->r_symndx = tsec->output_section->target_index;
- irel->r_type = R_POS;
- irel->r_size = reloc_size;
- flinfo->section_info[oindx].rel_hashes[osec->reloc_count] = NULL;
- ++osec->reloc_count;
- if (!xcoff_create_ldrel (output_bfd, flinfo, osec,
- output_bfd, irel, tsec, NULL))
- return false;
- }
- if (h->indx >= 0 || flinfo->info->strip == strip_all)
- {
- BFD_ASSERT (outsym == flinfo->outsyms);
- return true;
- }
- if (h->indx != -2
- && (flinfo->info->strip == strip_all
- || (flinfo->info->strip == strip_some
- && bfd_hash_lookup (flinfo->info->keep_hash, h->root.root.string,
- false, false) == NULL)))
- {
- BFD_ASSERT (outsym == flinfo->outsyms);
- return true;
- }
- if (h->indx != -2
- && (h->flags & (XCOFF_REF_REGULAR | XCOFF_DEF_REGULAR)) == 0)
- {
- BFD_ASSERT (outsym == flinfo->outsyms);
- return true;
- }
- memset (&aux, 0, sizeof aux);
- h->indx = obj_raw_syment_count (output_bfd);
- result = bfd_xcoff_put_symbol_name (output_bfd, flinfo->info, flinfo->strtab,
- &isym, h->root.root.string);
- if (!result)
- return false;
- if (h->root.type == bfd_link_hash_undefined
- || h->root.type == bfd_link_hash_undefweak)
- {
- isym.n_value = 0;
- isym.n_scnum = N_UNDEF;
- if (h->root.type == bfd_link_hash_undefweak
- && C_WEAKEXT == C_AIX_WEAKEXT)
- isym.n_sclass = C_WEAKEXT;
- else
- isym.n_sclass = C_EXT;
- aux.x_csect.x_smtyp = XTY_ER;
- }
- else if ((h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && h->smclas == XMC_XO)
- {
- BFD_ASSERT (bfd_is_abs_symbol (&h->root));
- isym.n_value = h->root.u.def.value;
- isym.n_scnum = N_UNDEF;
- if (h->root.type == bfd_link_hash_defweak
- && C_WEAKEXT == C_AIX_WEAKEXT)
- isym.n_sclass = C_WEAKEXT;
- else
- isym.n_sclass = C_EXT;
- aux.x_csect.x_smtyp = XTY_ER;
- }
- else if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- struct xcoff_link_size_list *l;
- isym.n_value = (h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset
- + h->root.u.def.value);
- if (bfd_is_abs_section (h->root.u.def.section->output_section))
- isym.n_scnum = N_ABS;
- else
- isym.n_scnum = h->root.u.def.section->output_section->target_index;
- isym.n_sclass = C_HIDEXT;
- aux.x_csect.x_smtyp = XTY_SD;
- if ((h->flags & XCOFF_HAS_SIZE) != 0)
- {
- for (l = xcoff_hash_table (flinfo->info)->size_list;
- l != NULL;
- l = l->next)
- {
- if (l->h == h)
- {
- aux.x_csect.x_scnlen.l = l->size;
- break;
- }
- }
- }
- }
- else if (h->root.type == bfd_link_hash_common)
- {
- isym.n_value = (h->root.u.c.p->section->output_section->vma
- + h->root.u.c.p->section->output_offset);
- isym.n_scnum = h->root.u.c.p->section->output_section->target_index;
- isym.n_sclass = C_EXT;
- aux.x_csect.x_smtyp = XTY_CM;
- aux.x_csect.x_scnlen.l = h->root.u.c.size;
- }
- else
- abort ();
- isym.n_type = T_NULL;
- isym.n_numaux = 1;
- bfd_coff_swap_sym_out (output_bfd, (void *) &isym, (void *) outsym);
- outsym += bfd_coff_symesz (output_bfd);
- aux.x_csect.x_smclas = h->smclas;
- bfd_coff_swap_aux_out (output_bfd, (void *) &aux, T_NULL, isym.n_sclass, 0, 1,
- (void *) outsym);
- outsym += bfd_coff_auxesz (output_bfd);
- if ((h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && h->smclas != XMC_XO)
- {
- /* We just output an SD symbol. Now output an LD symbol. */
- h->indx += 2;
- if (h->root.type == bfd_link_hash_defweak
- && C_WEAKEXT == C_AIX_WEAKEXT)
- isym.n_sclass = C_WEAKEXT;
- else
- isym.n_sclass = C_EXT;
- bfd_coff_swap_sym_out (output_bfd, (void *) &isym, (void *) outsym);
- outsym += bfd_coff_symesz (output_bfd);
- aux.x_csect.x_smtyp = XTY_LD;
- aux.x_csect.x_scnlen.l = obj_raw_syment_count (output_bfd);
- bfd_coff_swap_aux_out (output_bfd, (void *) &aux, T_NULL, C_EXT, 0, 1,
- (void *) outsym);
- outsym += bfd_coff_auxesz (output_bfd);
- }
- pos = obj_sym_filepos (output_bfd);
- pos += obj_raw_syment_count (output_bfd) * bfd_coff_symesz (output_bfd);
- amt = outsym - flinfo->outsyms;
- if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
- || bfd_bwrite (flinfo->outsyms, amt, output_bfd) != amt)
- return false;
- obj_raw_syment_count (output_bfd) +=
- (outsym - flinfo->outsyms) / bfd_coff_symesz (output_bfd);
- return true;
- }
- /* Handle a link order which is supposed to generate a reloc. */
- static bool
- xcoff_reloc_link_order (bfd *output_bfd,
- struct xcoff_final_link_info *flinfo,
- asection *output_section,
- struct bfd_link_order *link_order)
- {
- reloc_howto_type *howto;
- struct xcoff_link_hash_entry *h;
- asection *hsec;
- bfd_vma hval;
- bfd_vma addend;
- struct internal_reloc *irel;
- struct xcoff_link_hash_entry **rel_hash_ptr;
- if (link_order->type == bfd_section_reloc_link_order)
- /* We need to somehow locate a symbol in the right section. The
- symbol must either have a value of zero, or we must adjust
- the addend by the value of the symbol. FIXME: Write this
- when we need it. The old linker couldn't handle this anyhow. */
- abort ();
- howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
- if (howto == NULL)
- {
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- h = ((struct xcoff_link_hash_entry *)
- bfd_wrapped_link_hash_lookup (output_bfd, flinfo->info,
- link_order->u.reloc.p->u.name,
- false, false, true));
- if (h == NULL)
- {
- (*flinfo->info->callbacks->unattached_reloc)
- (flinfo->info, link_order->u.reloc.p->u.name, NULL, NULL, (bfd_vma) 0);
- return true;
- }
- hsec = xcoff_symbol_section (h);
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- hval = h->root.u.def.value;
- else
- hval = 0;
- addend = link_order->u.reloc.p->addend;
- if (hsec != NULL)
- addend += (hsec->output_section->vma
- + hsec->output_offset
- + hval);
- if (addend != 0)
- {
- bfd_size_type size;
- bfd_byte *buf;
- bfd_reloc_status_type rstat;
- bool ok;
- size = bfd_get_reloc_size (howto);
- buf = bfd_zmalloc (size);
- if (buf == NULL && size != 0)
- return false;
- rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
- switch (rstat)
- {
- case bfd_reloc_ok:
- break;
- default:
- case bfd_reloc_outofrange:
- abort ();
- case bfd_reloc_overflow:
- (*flinfo->info->callbacks->reloc_overflow)
- (flinfo->info, NULL, link_order->u.reloc.p->u.name,
- howto->name, addend, NULL, NULL, (bfd_vma) 0);
- break;
- }
- ok = bfd_set_section_contents (output_bfd, output_section, (void *) buf,
- (file_ptr) link_order->offset, size);
- free (buf);
- if (! ok)
- return false;
- }
- /* Store the reloc information in the right place. It will get
- swapped and written out at the end of the final_link routine. */
- irel = (flinfo->section_info[output_section->target_index].relocs
- + output_section->reloc_count);
- rel_hash_ptr = (flinfo->section_info[output_section->target_index].rel_hashes
- + output_section->reloc_count);
- memset (irel, 0, sizeof (struct internal_reloc));
- *rel_hash_ptr = NULL;
- irel->r_vaddr = output_section->vma + link_order->offset;
- if (h->indx >= 0)
- irel->r_symndx = h->indx;
- else
- {
- /* Set the index to -2 to force this symbol to get written out. */
- h->indx = -2;
- *rel_hash_ptr = h;
- irel->r_symndx = 0;
- }
- irel->r_type = howto->type;
- irel->r_size = howto->bitsize - 1;
- if (howto->complain_on_overflow == complain_overflow_signed)
- irel->r_size |= 0x80;
- ++output_section->reloc_count;
- /* Now output the reloc to the .loader section. */
- if (xcoff_hash_table (flinfo->info)->loader_section)
- {
- if (!xcoff_create_ldrel (output_bfd, flinfo, output_section,
- output_bfd, irel, hsec, h))
- return false;
- }
- return true;
- }
- /* Do the final link step. */
- bool
- _bfd_xcoff_bfd_final_link (bfd *abfd, struct bfd_link_info *info)
- {
- bfd_size_type symesz;
- struct xcoff_final_link_info flinfo;
- asection *o;
- struct bfd_link_order *p;
- bfd_size_type max_contents_size;
- bfd_size_type max_sym_count;
- bfd_size_type max_lineno_count;
- bfd_size_type max_reloc_count;
- bfd_size_type max_output_reloc_count;
- file_ptr rel_filepos;
- unsigned int relsz;
- file_ptr line_filepos;
- unsigned int linesz;
- bfd *sub;
- bfd_byte *external_relocs = NULL;
- char strbuf[STRING_SIZE_SIZE];
- file_ptr pos;
- bfd_size_type amt;
- if (bfd_link_pic (info))
- abfd->flags |= DYNAMIC;
- symesz = bfd_coff_symesz (abfd);
- flinfo.info = info;
- flinfo.output_bfd = abfd;
- flinfo.strtab = NULL;
- flinfo.section_info = NULL;
- flinfo.last_file_index = -1;
- flinfo.toc_symindx = -1;
- flinfo.internal_syms = NULL;
- flinfo.sym_indices = NULL;
- flinfo.outsyms = NULL;
- flinfo.linenos = NULL;
- flinfo.contents = NULL;
- flinfo.external_relocs = NULL;
- if (xcoff_hash_table (info)->loader_section)
- {
- flinfo.ldsym = (xcoff_hash_table (info)->loader_section->contents
- + bfd_xcoff_ldhdrsz (abfd));
- flinfo.ldrel = (xcoff_hash_table (info)->loader_section->contents
- + bfd_xcoff_ldhdrsz (abfd)
- + (xcoff_hash_table (info)->ldhdr.l_nsyms
- * bfd_xcoff_ldsymsz (abfd)));
- }
- else
- {
- flinfo.ldsym = NULL;
- flinfo.ldrel = NULL;
- }
- xcoff_data (abfd)->coff.link_info = info;
- flinfo.strtab = _bfd_stringtab_init ();
- if (flinfo.strtab == NULL)
- goto error_return;
- /* Count the relocation entries required for the output file.
- (We've already counted the line numbers.) Determine a few
- maximum sizes. */
- max_contents_size = 0;
- max_lineno_count = 0;
- max_reloc_count = 0;
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- o->reloc_count = 0;
- for (p = o->map_head.link_order; p != NULL; p = p->next)
- {
- if (p->type == bfd_indirect_link_order)
- {
- asection *sec;
- sec = p->u.indirect.section;
- /* Mark all sections which are to be included in the
- link. This will normally be every section. We need
- to do this so that we can identify any sections which
- the linker has decided to not include. */
- sec->linker_mark = true;
- o->reloc_count += sec->reloc_count;
- if ((sec->flags & SEC_IN_MEMORY) == 0)
- {
- if (sec->rawsize > max_contents_size)
- max_contents_size = sec->rawsize;
- if (sec->size > max_contents_size)
- max_contents_size = sec->size;
- }
- if (coff_section_data (sec->owner, sec) != NULL
- && xcoff_section_data (sec->owner, sec) != NULL
- && (xcoff_section_data (sec->owner, sec)->lineno_count
- > max_lineno_count))
- max_lineno_count =
- xcoff_section_data (sec->owner, sec)->lineno_count;
- if (sec->reloc_count > max_reloc_count)
- max_reloc_count = sec->reloc_count;
- }
- else if (p->type == bfd_section_reloc_link_order
- || p->type == bfd_symbol_reloc_link_order)
- ++o->reloc_count;
- }
- }
- /* Compute the file positions for all the sections. */
- if (abfd->output_has_begun)
- {
- if (xcoff_hash_table (info)->file_align != 0)
- abort ();
- }
- else
- {
- bfd_vma file_align;
- file_align = xcoff_hash_table (info)->file_align;
- if (file_align != 0)
- {
- bool saw_contents;
- int indx;
- file_ptr sofar;
- /* Insert .pad sections before every section which has
- contents and is loaded, if it is preceded by some other
- section which has contents and is loaded. */
- saw_contents = true;
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- if (strcmp (o->name, ".pad") == 0)
- saw_contents = false;
- else if ((o->flags & SEC_HAS_CONTENTS) != 0
- && (o->flags & SEC_LOAD) != 0)
- {
- if (! saw_contents)
- saw_contents = true;
- else
- {
- asection *n;
- /* Create a pad section and place it before the section
- that needs padding. This requires unlinking and
- relinking the bfd's section list. */
- n = bfd_make_section_anyway_with_flags (abfd, ".pad",
- SEC_HAS_CONTENTS);
- n->alignment_power = 0;
- bfd_section_list_remove (abfd, n);
- bfd_section_list_insert_before (abfd, o, n);
- saw_contents = false;
- }
- }
- }
- /* Reset the section indices after inserting the new
- sections. */
- indx = 0;
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- ++indx;
- o->target_index = indx;
- }
- BFD_ASSERT ((unsigned int) indx == abfd->section_count);
- /* Work out appropriate sizes for the .pad sections to force
- each section to land on a page boundary. This bit of
- code knows what compute_section_file_positions is going
- to do. */
- sofar = bfd_coff_filhsz (abfd);
- sofar += bfd_coff_aoutsz (abfd);
- sofar += abfd->section_count * bfd_coff_scnhsz (abfd);
- for (o = abfd->sections; o != NULL; o = o->next)
- if ((bfd_xcoff_is_reloc_count_overflow
- (abfd, (bfd_vma) o->reloc_count))
- || (bfd_xcoff_is_lineno_count_overflow
- (abfd, (bfd_vma) o->lineno_count)))
- /* 64 does not overflow, need to check if 32 does */
- sofar += bfd_coff_scnhsz (abfd);
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- if (strcmp (o->name, ".pad") == 0)
- {
- bfd_vma pageoff;
- BFD_ASSERT (o->size == 0);
- pageoff = sofar & (file_align - 1);
- if (pageoff != 0)
- {
- o->size = file_align - pageoff;
- sofar += file_align - pageoff;
- o->flags |= SEC_HAS_CONTENTS;
- }
- }
- else
- {
- if ((o->flags & SEC_HAS_CONTENTS) != 0)
- sofar += BFD_ALIGN (o->size,
- 1 << o->alignment_power);
- }
- }
- }
- if (! bfd_coff_compute_section_file_positions (abfd))
- goto error_return;
- }
- /* Allocate space for the pointers we need to keep for the relocs. */
- {
- unsigned int i;
- /* We use section_count + 1, rather than section_count, because
- the target_index fields are 1 based. */
- amt = abfd->section_count + 1;
- amt *= sizeof (struct xcoff_link_section_info);
- flinfo.section_info = bfd_malloc (amt);
- if (flinfo.section_info == NULL)
- goto error_return;
- for (i = 0; i <= abfd->section_count; i++)
- {
- flinfo.section_info[i].relocs = NULL;
- flinfo.section_info[i].rel_hashes = NULL;
- flinfo.section_info[i].toc_rel_hashes = NULL;
- }
- }
- /* Set the file positions for the relocs. */
- rel_filepos = obj_relocbase (abfd);
- relsz = bfd_coff_relsz (abfd);
- max_output_reloc_count = 0;
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- if (o->reloc_count == 0)
- o->rel_filepos = 0;
- else
- {
- /* A stripped file has no relocs. However, we still
- allocate the buffers, so that later code doesn't have to
- worry about whether we are stripping or not. */
- if (info->strip == strip_all)
- o->rel_filepos = 0;
- else
- {
- o->flags |= SEC_RELOC;
- o->rel_filepos = rel_filepos;
- rel_filepos += o->reloc_count * relsz;
- }
- /* We don't know the indices of global symbols until we have
- written out all the local symbols. For each section in
- the output file, we keep an array of pointers to hash
- table entries. Each entry in the array corresponds to a
- reloc. When we find a reloc against a global symbol, we
- set the corresponding entry in this array so that we can
- fix up the symbol index after we have written out all the
- local symbols.
- Because of this problem, we also keep the relocs in
- memory until the end of the link. This wastes memory.
- We could backpatch the file later, I suppose, although it
- would be slow. */
- amt = o->reloc_count;
- amt *= sizeof (struct internal_reloc);
- flinfo.section_info[o->target_index].relocs = bfd_malloc (amt);
- amt = o->reloc_count;
- amt *= sizeof (struct xcoff_link_hash_entry *);
- flinfo.section_info[o->target_index].rel_hashes = bfd_malloc (amt);
- if (flinfo.section_info[o->target_index].relocs == NULL
- || flinfo.section_info[o->target_index].rel_hashes == NULL)
- goto error_return;
- if (o->reloc_count > max_output_reloc_count)
- max_output_reloc_count = o->reloc_count;
- }
- }
- /* We now know the size of the relocs, so we can determine the file
- positions of the line numbers. */
- line_filepos = rel_filepos;
- flinfo.line_filepos = line_filepos;
- linesz = bfd_coff_linesz (abfd);
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- if (o->lineno_count == 0)
- o->line_filepos = 0;
- else
- {
- o->line_filepos = line_filepos;
- line_filepos += o->lineno_count * linesz;
- }
- /* Reset the reloc and lineno counts, so that we can use them to
- count the number of entries we have output so far. */
- o->reloc_count = 0;
- o->lineno_count = 0;
- }
- obj_sym_filepos (abfd) = line_filepos;
- /* Figure out the largest number of symbols in an input BFD. Take
- the opportunity to clear the output_has_begun fields of all the
- input BFD's. We want at least 6 symbols, since that is the
- number which xcoff_write_global_symbol may need. */
- max_sym_count = 6;
- for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
- {
- bfd_size_type sz;
- sub->output_has_begun = false;
- sz = obj_raw_syment_count (sub);
- if (sz > max_sym_count)
- max_sym_count = sz;
- }
- /* Allocate some buffers used while linking. */
- amt = max_sym_count * sizeof (struct internal_syment);
- flinfo.internal_syms = bfd_malloc (amt);
- amt = max_sym_count * sizeof (long);
- flinfo.sym_indices = bfd_malloc (amt);
- amt = (max_sym_count + 1) * symesz;
- flinfo.outsyms = bfd_malloc (amt);
- amt = max_lineno_count * bfd_coff_linesz (abfd);
- flinfo.linenos = bfd_malloc (amt);
- amt = max_contents_size;
- flinfo.contents = bfd_malloc (amt);
- amt = max_reloc_count * relsz;
- flinfo.external_relocs = bfd_malloc (amt);
- if ((flinfo.internal_syms == NULL && max_sym_count > 0)
- || (flinfo.sym_indices == NULL && max_sym_count > 0)
- || flinfo.outsyms == NULL
- || (flinfo.linenos == NULL && max_lineno_count > 0)
- || (flinfo.contents == NULL && max_contents_size > 0)
- || (flinfo.external_relocs == NULL && max_reloc_count > 0))
- goto error_return;
- obj_raw_syment_count (abfd) = 0;
- /* Find a TOC symbol, if we need one. */
- if (!xcoff_find_tc0 (abfd, &flinfo))
- goto error_return;
- /* We now know the position of everything in the file, except that
- we don't know the size of the symbol table and therefore we don't
- know where the string table starts. We just build the string
- table in memory as we go along. We process all the relocations
- for a single input file at once. */
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- for (p = o->map_head.link_order; p != NULL; p = p->next)
- {
- if (p->type == bfd_indirect_link_order
- && p->u.indirect.section->owner->xvec == abfd->xvec)
- {
- sub = p->u.indirect.section->owner;
- if (! sub->output_has_begun)
- {
- if (! xcoff_link_input_bfd (&flinfo, sub))
- goto error_return;
- sub->output_has_begun = true;
- }
- }
- else if (p->type == bfd_section_reloc_link_order
- || p->type == bfd_symbol_reloc_link_order)
- {
- if (! xcoff_reloc_link_order (abfd, &flinfo, o, p))
- goto error_return;
- }
- else
- {
- if (! _bfd_default_link_order (abfd, info, o, p))
- goto error_return;
- }
- }
- }
- /* Free up the buffers used by xcoff_link_input_bfd. */
- free (flinfo.internal_syms);
- flinfo.internal_syms = NULL;
- free (flinfo.sym_indices);
- flinfo.sym_indices = NULL;
- free (flinfo.linenos);
- flinfo.linenos = NULL;
- free (flinfo.contents);
- flinfo.contents = NULL;
- free (flinfo.external_relocs);
- flinfo.external_relocs = NULL;
- /* The value of the last C_FILE symbol is supposed to be -1. Write
- it out again. */
- if (flinfo.last_file_index != -1)
- {
- flinfo.last_file.n_value = -(bfd_vma) 1;
- bfd_coff_swap_sym_out (abfd, (void *) &flinfo.last_file,
- (void *) flinfo.outsyms);
- pos = obj_sym_filepos (abfd) + flinfo.last_file_index * symesz;
- if (bfd_seek (abfd, pos, SEEK_SET) != 0
- || bfd_bwrite (flinfo.outsyms, symesz, abfd) != symesz)
- goto error_return;
- }
- /* Write out all the global symbols which do not come from XCOFF
- input files. */
- bfd_hash_traverse (&info->hash->table, xcoff_write_global_symbol, &flinfo);
- free (flinfo.outsyms);
- flinfo.outsyms = NULL;
- /* Now that we have written out all the global symbols, we know the
- symbol indices to use for relocs against them, and we can finally
- write out the relocs. */
- amt = max_output_reloc_count * relsz;
- external_relocs = bfd_malloc (amt);
- if (external_relocs == NULL && max_output_reloc_count != 0)
- goto error_return;
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- struct internal_reloc *irel;
- struct internal_reloc *irelend;
- struct xcoff_link_hash_entry **rel_hash;
- struct xcoff_toc_rel_hash *toc_rel_hash;
- bfd_byte *erel;
- bfd_size_type rel_size;
- /* A stripped file has no relocs. */
- if (info->strip == strip_all)
- {
- o->reloc_count = 0;
- continue;
- }
- if (o->reloc_count == 0)
- continue;
- irel = flinfo.section_info[o->target_index].relocs;
- irelend = irel + o->reloc_count;
- rel_hash = flinfo.section_info[o->target_index].rel_hashes;
- for (; irel < irelend; irel++, rel_hash++)
- {
- if (*rel_hash != NULL)
- {
- if ((*rel_hash)->indx < 0)
- {
- (*info->callbacks->unattached_reloc)
- (info, (*rel_hash)->root.root.string,
- NULL, o, irel->r_vaddr);
- (*rel_hash)->indx = 0;
- }
- irel->r_symndx = (*rel_hash)->indx;
- }
- }
- for (toc_rel_hash = flinfo.section_info[o->target_index].toc_rel_hashes;
- toc_rel_hash != NULL;
- toc_rel_hash = toc_rel_hash->next)
- {
- if (toc_rel_hash->h->u.toc_indx < 0)
- {
- (*info->callbacks->unattached_reloc)
- (info, toc_rel_hash->h->root.root.string,
- NULL, o, toc_rel_hash->rel->r_vaddr);
- toc_rel_hash->h->u.toc_indx = 0;
- }
- toc_rel_hash->rel->r_symndx = toc_rel_hash->h->u.toc_indx;
- }
- /* XCOFF requires that the relocs be sorted by address. We tend
- to produce them in the order in which their containing csects
- appear in the symbol table, which is not necessarily by
- address. So we sort them here. There may be a better way to
- do this. */
- qsort ((void *) flinfo.section_info[o->target_index].relocs,
- o->reloc_count, sizeof (struct internal_reloc),
- xcoff_sort_relocs);
- irel = flinfo.section_info[o->target_index].relocs;
- irelend = irel + o->reloc_count;
- erel = external_relocs;
- for (; irel < irelend; irel++, rel_hash++, erel += relsz)
- bfd_coff_swap_reloc_out (abfd, (void *) irel, (void *) erel);
- rel_size = relsz * o->reloc_count;
- if (bfd_seek (abfd, o->rel_filepos, SEEK_SET) != 0
- || bfd_bwrite ((void *) external_relocs, rel_size, abfd) != rel_size)
- goto error_return;
- }
- free (external_relocs);
- external_relocs = NULL;
- /* Free up the section information. */
- if (flinfo.section_info != NULL)
- {
- unsigned int i;
- for (i = 0; i < abfd->section_count; i++)
- {
- free (flinfo.section_info[i].relocs);
- free (flinfo.section_info[i].rel_hashes);
- }
- free (flinfo.section_info);
- flinfo.section_info = NULL;
- }
- /* Write out the loader section contents. */
- o = xcoff_hash_table (info)->loader_section;
- if (o != NULL
- && o->size != 0
- && o->output_section != bfd_abs_section_ptr)
- {
- BFD_ASSERT ((bfd_byte *) flinfo.ldrel
- == (xcoff_hash_table (info)->loader_section->contents
- + xcoff_hash_table (info)->ldhdr.l_impoff));
- if (!bfd_set_section_contents (abfd, o->output_section, o->contents,
- (file_ptr) o->output_offset, o->size))
- goto error_return;
- }
- /* Write out the magic sections. */
- o = xcoff_hash_table (info)->linkage_section;
- if (o != NULL
- && o->size != 0
- && o->output_section != bfd_abs_section_ptr
- && ! bfd_set_section_contents (abfd, o->output_section, o->contents,
- (file_ptr) o->output_offset,
- o->size))
- goto error_return;
- o = xcoff_hash_table (info)->toc_section;
- if (o != NULL
- && o->size != 0
- && o->output_section != bfd_abs_section_ptr
- && ! bfd_set_section_contents (abfd, o->output_section, o->contents,
- (file_ptr) o->output_offset,
- o->size))
- goto error_return;
- o = xcoff_hash_table (info)->descriptor_section;
- if (o != NULL
- && o->size != 0
- && o->output_section != bfd_abs_section_ptr
- && ! bfd_set_section_contents (abfd, o->output_section, o->contents,
- (file_ptr) o->output_offset,
- o->size))
- goto error_return;
- /* Write out the string table. */
- pos = obj_sym_filepos (abfd) + obj_raw_syment_count (abfd) * symesz;
- if (bfd_seek (abfd, pos, SEEK_SET) != 0)
- goto error_return;
- H_PUT_32 (abfd,
- _bfd_stringtab_size (flinfo.strtab) + STRING_SIZE_SIZE,
- strbuf);
- amt = STRING_SIZE_SIZE;
- if (bfd_bwrite (strbuf, amt, abfd) != amt)
- goto error_return;
- if (! _bfd_stringtab_emit (abfd, flinfo.strtab))
- goto error_return;
- _bfd_stringtab_free (flinfo.strtab);
- /* Write out the debugging string table. */
- o = xcoff_hash_table (info)->debug_section;
- if (o != NULL
- && o->size != 0
- && o->output_section != bfd_abs_section_ptr)
- {
- struct bfd_strtab_hash *debug_strtab;
- debug_strtab = xcoff_hash_table (info)->debug_strtab;
- BFD_ASSERT (o->output_section->size - o->output_offset
- >= _bfd_stringtab_size (debug_strtab));
- pos = o->output_section->filepos + o->output_offset;
- if (bfd_seek (abfd, pos, SEEK_SET) != 0)
- goto error_return;
- if (! _bfd_stringtab_emit (abfd, debug_strtab))
- goto error_return;
- }
- /* Setting symcount to 0 will cause write_object_contents to
- not try to write out the symbols. */
- abfd->symcount = 0;
- return true;
- error_return:
- if (flinfo.strtab != NULL)
- _bfd_stringtab_free (flinfo.strtab);
- if (flinfo.section_info != NULL)
- {
- unsigned int i;
- for (i = 0; i < abfd->section_count; i++)
- {
- free (flinfo.section_info[i].relocs);
- free (flinfo.section_info[i].rel_hashes);
- }
- free (flinfo.section_info);
- }
- free (flinfo.internal_syms);
- free (flinfo.sym_indices);
- free (flinfo.outsyms);
- free (flinfo.linenos);
- free (flinfo.contents);
- free (flinfo.external_relocs);
- free (external_relocs);
- return false;
- }
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