--- /dev/null
+/* POWER/PowerPC XCOFF linker support.
+ Copyright 1995 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "bfdlink.h"
+#include "libbfd.h"
+#include "coff/internal.h"
+#include "libcoff.h"
+
+/* This file holds the XCOFF linker code. A lot of it is very similar
+ to the COFF linker code. However, it is different enough that I
+ chose to avoid trying to hack up the COFF code to support XCOFF.
+ That leads to a certain amount of duplicated code, alas. */
+
+#define STRING_SIZE_SIZE (4)
+
+/* Get the XCOFF hash table entries for a BFD. */
+#define obj_xcoff_sym_hashes(bfd) \
+ ((struct xcoff_link_hash_entry **) obj_coff_sym_hashes (bfd))
+
+/* An entry in the XCOFF linker hash table. */
+
+struct xcoff_link_hash_entry
+{
+ struct bfd_link_hash_entry root;
+
+ /* Whether this symbol came from an XCOFF input file. */
+ boolean xcoff;
+
+ /* Symbol index in output file. Set to -1 initially. Set to -2 if
+ there is a reloc against this symbol. */
+ long indx;
+
+ /* Whether we have created a TOC entry for this symbol. */
+ boolean toc;
+};
+
+/* The XCOFF linker hash table. */
+
+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;
+};
+
+/* Information we keep for each section in the output file. */
+
+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;
+};
+
+/* 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;
+ /* 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 struct bfd_hash_entry *xcoff_link_hash_newfunc
+ PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
+static boolean xcoff_link_add_object_symbols
+ PARAMS ((bfd *, struct bfd_link_info *));
+static boolean xcoff_link_check_archive_element
+ PARAMS ((bfd *, struct bfd_link_info *, boolean *));
+static boolean xcoff_link_check_ar_symbols
+ PARAMS ((bfd *, struct bfd_link_info *, boolean *));
+static boolean xcoff_link_add_symbols PARAMS ((bfd *, struct bfd_link_info *));
+static boolean xcoff_link_input_bfd
+ PARAMS ((struct xcoff_final_link_info *, bfd *));
+static boolean xcoff_write_global_symbol
+ PARAMS ((struct xcoff_link_hash_entry *, PTR));
+static boolean xcoff_reloc_link_order
+ PARAMS ((bfd *, struct xcoff_final_link_info *, asection *,
+ struct bfd_link_order *));
+static int xcoff_sort_relocs PARAMS ((const PTR, const PTR));
+
+/* Routine to create an entry in an XCOFF link hash table. */
+
+static struct bfd_hash_entry *
+xcoff_link_hash_newfunc (entry, table, string)
+ 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 == (struct xcoff_link_hash_entry *) NULL)
+ ret = ((struct xcoff_link_hash_entry *)
+ bfd_hash_allocate (table, sizeof (struct xcoff_link_hash_entry)));
+ if (ret == (struct xcoff_link_hash_entry *) NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ return (struct bfd_hash_entry *) ret;
+ }
+
+ /* 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->xcoff = false;
+ ret->indx = -1;
+ ret->toc = false;
+ }
+
+ return (struct bfd_hash_entry *) ret;
+}
+
+/* Create a XCOFF link hash table. */
+
+struct bfd_link_hash_table *
+_bfd_xcoff_bfd_link_hash_table_create (abfd)
+ bfd *abfd;
+{
+ struct xcoff_link_hash_table *ret;
+
+ ret = ((struct xcoff_link_hash_table *)
+ bfd_alloc (abfd, sizeof (struct xcoff_link_hash_table)));
+ if (ret == (struct xcoff_link_hash_table *) NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ return (struct bfd_link_hash_table *) NULL;
+ }
+ if (! _bfd_link_hash_table_init (&ret->root, abfd, xcoff_link_hash_newfunc))
+ {
+ bfd_release (abfd, ret);
+ return (struct bfd_link_hash_table *) NULL;
+ }
+
+ ret->debug_strtab = _bfd_xcoff_stringtab_init ();
+ ret->debug_section = NULL;
+
+ return &ret->root;
+}
+
+/* Look up an entry in an XCOFF link hash table. */
+
+#define xcoff_link_hash_lookup(table, string, create, copy, follow) \
+ ((struct xcoff_link_hash_entry *) \
+ bfd_link_hash_lookup (&(table)->root, (string), (create), (copy),\
+ (follow)))
+
+/* Traverse an XCOFF link hash table. */
+
+#define xcoff_link_hash_traverse(table, func, info) \
+ (bfd_link_hash_traverse \
+ (&(table)->root, \
+ (boolean (*) PARAMS ((struct bfd_link_hash_entry *, PTR))) (func), \
+ (info)))
+
+/* Get the XCOFF link hash table from the info structure. This is
+ just a cast. */
+
+#define xcoff_hash_table(p) ((struct xcoff_link_hash_table *) ((p)->hash))
+
+/* Given an XCOFF BFD, add symbols to the global hash table as
+ appropriate. */
+
+boolean
+_bfd_xcoff_bfd_link_add_symbols (abfd, info)
+ 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:
+ return (_bfd_generic_link_add_archive_symbols
+ (abfd, info, xcoff_link_check_archive_element));
+ default:
+ bfd_set_error (bfd_error_wrong_format);
+ return false;
+ }
+}
+
+/* Add symbols from an XCOFF object file. */
+
+static boolean
+xcoff_link_add_object_symbols (abfd, info)
+ 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;
+}
+
+/* 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 boolean
+xcoff_link_check_archive_element (abfd, info, pneeded)
+ bfd *abfd;
+ struct bfd_link_info *info;
+ boolean *pneeded;
+{
+ if (! _bfd_coff_get_external_symbols (abfd))
+ return false;
+
+ if (! xcoff_link_check_ar_symbols (abfd, info, pneeded))
+ return false;
+
+ if (*pneeded)
+ {
+ if (! xcoff_link_add_symbols (abfd, info))
+ return false;
+ }
+
+ if (! info->keep_memory || ! *pneeded)
+ {
+ if (! _bfd_coff_free_symbols (abfd))
+ return false;
+ }
+
+ return true;
+}
+
+/* Look through the symbols to see if this object file should be
+ included in the link. */
+
+static boolean
+xcoff_link_check_ar_symbols (abfd, info, pneeded)
+ bfd *abfd;
+ struct bfd_link_info *info;
+ boolean *pneeded;
+{
+ bfd_size_type symesz;
+ bfd_byte *esym;
+ bfd_byte *esym_end;
+
+ *pneeded = false;
+
+ 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, (PTR) esym, (PTR) &sym);
+
+ if (sym.n_sclass == C_EXT && 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. */
+ if (h != (struct bfd_link_hash_entry *) NULL
+ && h->type == bfd_link_hash_undefined)
+ {
+ if (! (*info->callbacks->add_archive_element) (info, abfd, name))
+ return false;
+ *pneeded = true;
+ return true;
+ }
+ }
+
+ esym += (sym.n_numaux + 1) * symesz;
+ }
+
+ /* We do not need this object file. */
+ return true;
+}
+
+/* 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 boolean
+xcoff_link_add_symbols (abfd, info)
+ bfd *abfd;
+ struct bfd_link_info *info;
+{
+ boolean default_copy;
+ bfd_size_type symcount;
+ struct xcoff_link_hash_entry **sym_hash;
+ asection **csect_cache;
+ asection *debug_section;
+ unsigned long *debug_index = NULL;
+ bfd_byte *debug_contents = NULL;
+ asection *sub;
+ asection *csect;
+ unsigned int csect_index;
+ asection *first_csect;
+ boolean new_debug;
+ bfd_size_type symesz;
+ bfd_byte *esym;
+ bfd_byte *esym_end;
+ struct reloc_info_struct
+ {
+ struct internal_reloc *relocs;
+ boolean *used;
+ } *reloc_info = NULL;
+
+ 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. */
+ sym_hash = ((struct xcoff_link_hash_entry **)
+ bfd_alloc (abfd,
+ (symcount
+ * sizeof (struct xcoff_link_hash_entry *))));
+ if (sym_hash == NULL && symcount != 0)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ coff_data (abfd)->sym_hashes = (struct coff_link_hash_entry **) sym_hash;
+ memset (sym_hash, 0,
+ (size_t) symcount * sizeof (struct xcoff_link_hash_entry *));
+
+ /* 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. */
+ csect_cache = ((asection **)
+ bfd_alloc (abfd, symcount * sizeof (asection *)));
+ if (csect_cache == NULL && symcount != 0)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ xcoff_data (abfd)->csects = csect_cache;
+ memset (csect_cache, 0, (size_t) symcount * sizeof (asection *));
+
+ /* XCOFF stores debugging symbol names in the .debug section. We
+ need to determine the size of the final .debug section while
+ reading the input files, before the linker starts deciding where
+ to put everything. We build a hash table for the final .debug
+ section. For each symbol whose name goes into it, we store the
+ index in the .debug section in the debug_indices array. */
+ debug_section = bfd_get_section_by_name (abfd, ".debug");
+ if (debug_section != NULL && debug_section->_raw_size > 0)
+ {
+ debug_index = ((unsigned long *)
+ bfd_zalloc (abfd, symcount * sizeof (unsigned long)));
+ if (debug_index == NULL && symcount != 0)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ xcoff_data (abfd)->debug_indices = debug_index;
+
+ /* Grab the contents of the current .debug section. We use
+ malloc and copy the names into the string tab hash table,
+ 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
+ that case. */
+ debug_contents = (bfd_byte *) malloc (debug_section->_raw_size);
+ if (debug_contents == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ if (! bfd_get_section_contents (abfd, debug_section,
+ (PTR) debug_contents, (file_ptr) 0,
+ debug_section->_raw_size))
+ goto error_return;
+ }
+
+ /* 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. */
+ reloc_info = ((struct reloc_info_struct *)
+ malloc ((abfd->section_count + 1)
+ * sizeof (struct reloc_info_struct)));
+ if (reloc_info == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ memset ((PTR) reloc_info, 0,
+ (abfd->section_count + 1) * sizeof (struct reloc_info_struct));
+
+ /* Read in the relocs for each section which has relocs. */
+ for (sub = abfd->sections; sub != NULL; sub = sub->next)
+ {
+ if ((sub->flags & SEC_RELOC) != 0)
+ {
+ reloc_info[sub->target_index].relocs =
+ _bfd_coff_read_internal_relocs (abfd, sub, true,
+ (bfd_byte *) NULL, false,
+ (struct internal_reloc *) NULL);
+ reloc_info[sub->target_index].used =
+ (boolean *) malloc (sub->reloc_count * sizeof (boolean));
+ if (reloc_info[sub->target_index].used == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ memset (reloc_info[sub->target_index].used, 0,
+ sub->reloc_count * sizeof (boolean));
+ }
+ }
+
+ csect = NULL;
+ csect_index = 0;
+ first_csect = NULL;
+ new_debug = false;
+
+ 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;
+ PTR name;
+ char buf[SYMNMLEN + 1];
+ int smtyp;
+ flagword flags;
+ asection *section;
+ bfd_vma value;
+
+ bfd_coff_swap_sym_in (abfd, (PTR) esym, (PTR) &sym);
+
+ *debug_index = (unsigned long) -1;
+
+ /* If the name of this symbol is in the .debug section, and it
+ looks like we are going to keep it, add the name to the
+ .debug hash table. */
+ if (info->hash->creator == abfd->xvec
+ && sym._n._n_n._n_zeroes == 0
+ && info->strip != strip_all
+ && info->strip != strip_debugger
+ && info->discard != discard_all
+ && bfd_coff_symname_in_debug (abfd, &sym))
+ {
+ bfd_size_type indx;
+
+ /* Add 2 to skip the length. */
+ name = debug_contents + sym._n._n_n._n_offset;
+
+ indx = _bfd_stringtab_add (xcoff_hash_table (info)->debug_strtab,
+ name, true, true);
+ if (indx == (bfd_size_type) -1)
+ goto error_return;
+ *debug_index = indx;
+ new_debug = true;
+ }
+
+ /* In this pass we are only interested in symbols with csect
+ information. */
+ if (sym.n_sclass != C_EXT && sym.n_sclass != C_HIDEXT)
+ {
+ if (csect != NULL)
+ *csect_cache = csect;
+ else if (first_csect == NULL)
+ *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;
+ if (debug_index != NULL)
+ debug_index += sym.n_numaux + 1;
+ continue;
+ }
+
+ name = _bfd_coff_internal_syment_name (abfd, &sym, buf);
+ if (name == NULL)
+ goto error_return;
+
+ /* Pick up the csect auxiliary information. */
+
+ if (sym.n_numaux == 0)
+ {
+ (*_bfd_error_handler)
+ ("%s: class %d symbol `%s' has no aux entries",
+ bfd_get_filename (abfd), sym.n_sclass, name);
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+
+ bfd_coff_swap_aux_in (abfd,
+ (PTR) (esym + symesz * sym.n_numaux),
+ sym.n_type, sym.n_sclass,
+ sym.n_numaux - 1, sym.n_numaux,
+ (PTR) &aux);
+
+ smtyp = SMTYP_SMTYP (aux.x_csect.x_smtyp);
+
+ flags = BSF_GLOBAL;
+ section = NULL;
+ value = 0;
+
+ switch (smtyp)
+ {
+ default:
+ (*_bfd_error_handler)
+ ("%s: symbol `%s' has unrecognized csect type %d",
+ bfd_get_filename (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)
+ ("%s: bad XTY_ER symbol `%s': class %d scnum %d scnlen %d",
+ bfd_get_filename (abfd), name, sym.n_sclass, sym.n_scnum,
+ aux.x_csect.x_scnlen.l);
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+ section = bfd_und_section_ptr;
+ break;
+
+ case XTY_SD:
+ /* This is a csect definition. */
+
+ csect = NULL;
+ csect_index = -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)
+ ("%s: XMC_TC0 symbol `%s' is class %d scnlen %d",
+ bfd_get_filename (abfd), name, sym.n_sclass,
+ 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 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. */
+ if (aux.x_csect.x_smclas == XMC_TC
+ && sym.n_sclass == C_HIDEXT
+ && aux.x_csect.x_scnlen.l == 4)
+ {
+ asection *enclosing;
+ bfd_size_type relindx;
+ struct internal_reloc *rel;
+ boolean *used;
+
+ enclosing = coff_section_from_bfd_index (abfd, sym.n_scnum);
+ if (enclosing == NULL)
+ return false;
+
+ /* XCOFF requires that relocs be sorted by address, so
+ we could do a binary search here. FIXME. */
+ rel = reloc_info[enclosing->target_index].relocs;
+ used = reloc_info[enclosing->target_index].used;
+ for (relindx = 0;
+ relindx < enclosing->reloc_count;
+ relindx++, rel++, used++)
+ {
+ if (! *used
+ && rel->r_vaddr == (bfd_vma) sym.n_value
+ && rel->r_size == 31
+ && rel->r_type == 0)
+ break;
+ }
+ if (relindx < enclosing->reloc_count)
+ {
+ 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, (PTR) erelsym, (PTR) &relsym);
+ if (relsym.n_sclass == C_EXT)
+ {
+ const char *relname;
+ char relbuf[SYMNMLEN + 1];
+ boolean 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)
+ return false;
+ 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)
+ return false;
+
+ /* 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. */
+
+ /* Stuff h into *sym_hash. We normally only set
+ *sym_hash for global variables. Remembering
+ it here saves us doing this work again later. */
+ *sym_hash = h;
+
+ if (h->toc)
+ {
+ /* We already have a TOC entry for this
+ symbol, so we can just ignore this one.
+ We need to skip the csect, and the reloc
+ as well. */
+ *used = true;
+ break;
+ }
+
+ /* We are about to create a TOC entry for this
+ symbol. */
+ h->toc = true;
+ }
+ }
+ }
+
+ /* 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. */
+ {
+ static const char *csect_name_by_class[] =
+ {
+ ".pr", ".ro", ".db", ".tc", ".ua", ".rw", ".gl", ".xo",
+ ".sv", ".bs", ".ds", ".uc", ".ti", ".tb", NULL, ".tc0",
+ ".td"
+ };
+ const char *csect_name;
+ asection *enclosing;
+ struct internal_reloc *rel;
+ bfd_size_type relindx;
+ boolean *used;
+
+ if ((aux.x_csect.x_smclas >=
+ sizeof csect_name_by_class / sizeof csect_name_by_class[0])
+ || csect_name_by_class[aux.x_csect.x_smclas] == NULL)
+ {
+ (*_bfd_error_handler)
+ ("%s: symbol `%s' has unrecognized smclas %d",
+ bfd_get_filename (abfd), name, aux.x_csect.x_smclas);
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+
+ csect_name = csect_name_by_class[aux.x_csect.x_smclas];
+ csect = bfd_make_section_anyway (abfd, csect_name);
+ if (csect == NULL)
+ goto error_return;
+ enclosing = coff_section_from_bfd_index (abfd, sym.n_scnum);
+ if (enclosing == NULL)
+ goto error_return;
+ if ((bfd_vma) sym.n_value < enclosing->vma
+ || ((bfd_vma) sym.n_value + aux.x_csect.x_scnlen.l
+ > enclosing->vma + enclosing->_raw_size))
+ {
+ (*_bfd_error_handler)
+ ("%s: csect `%s' not in enclosing section",
+ bfd_get_filename (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->_raw_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);
+
+ /* XCOFF requires that relocs be sorted by address, so we
+ could do a binary search here. FIXME. (XCOFF
+ unfortunately does not require that symbols be sorted
+ by address, or this would be a simple merge). */
+ rel = reloc_info[enclosing->target_index].relocs;
+ used = reloc_info[enclosing->target_index].used;
+ for (relindx = 0;
+ relindx < enclosing->reloc_count;
+ relindx++, rel++, used++)
+ {
+ if (! *used
+ && rel->r_vaddr >= csect->vma
+ && rel->r_vaddr < csect->vma + csect->_raw_size)
+ {
+ csect->rel_filepos = (enclosing->rel_filepos
+ + relindx * bfd_coff_relsz (abfd));
+ break;
+ }
+ }
+ while (relindx < enclosing->reloc_count
+ && ! *used
+ && rel->r_vaddr >= csect->vma
+ && rel->r_vaddr < csect->vma + csect->_raw_size)
+ {
+ *used = true;
+ csect->flags |= SEC_RELOC;
+ ++csect->reloc_count;
+ ++relindx;
+ ++rel;
+ ++used;
+ }
+
+ /* There are a number of other fields and section flags
+ which we do not bother to set. */
+
+ /* Record the enclosing section in the tdata for this new
+ section. */
+ csect->used_by_bfd =
+ ((struct coff_section_tdata *)
+ bfd_alloc (abfd, sizeof (struct coff_section_tdata)));
+ if (csect->used_by_bfd == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ coff_section_data (abfd, csect)->tdata =
+ bfd_alloc (abfd, sizeof (struct xcoff_section_tdata));
+ if (coff_section_data (abfd, csect)->tdata == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ xcoff_section_data (abfd, csect)->enclosing = enclosing;
+
+ csect_index = ((esym
+ - (bfd_byte *) obj_coff_external_syms (abfd))
+ / symesz);
+
+ if (first_csect == NULL)
+ first_csect = csect;
+
+ /* If this symbol is C_EXT, we treat it as starting at the
+ beginning of the newly created section. */
+ if (sym.n_sclass == C_EXT)
+ {
+ section = csect;
+ value = 0;
+ }
+ }
+ break;
+
+ case XTY_LD:
+ /* This is a label definition. The x_scnlen field is the
+ symbol index of the csect. I believe that this must
+ always follow the appropriate XTY_SD symbol, so I will
+ insist on it. */
+ {
+ boolean bad;
+
+ bad = false;
+ if (sym.n_sclass != C_EXT
+ || 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)
+ ("%s: misplaced XTY_LD `%s'",
+ bfd_get_filename (abfd), name);
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+
+ 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. If this
+ csect is externally visible, it is a common symbol. */
+ if (sym.n_sclass == C_EXT)
+ {
+ section = bfd_com_section_ptr;
+ value = aux.x_csect.x_scnlen.l;
+ }
+ else
+ {
+ csect = bfd_make_section_anyway (abfd, ".bss");
+ if (csect == NULL)
+ goto error_return;
+ csect->vma = 0;
+ csect->_raw_size = aux.x_csect.x_scnlen.l;
+ csect->flags |= SEC_ALLOC;
+ 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);
+
+ if (first_csect == NULL)
+ first_csect = csect;
+ }
+ break;
+ }
+
+ /* Now we have enough information to add the symbol to the
+ linker hash table. */
+
+ if (sym.n_sclass == C_EXT)
+ {
+ boolean copy;
+
+ 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;
+
+ if (! (_bfd_generic_link_add_one_symbol
+ (info, abfd, name, flags, section, value,
+ (const char *) NULL, copy, false,
+ (struct bfd_link_hash_entry **) sym_hash)))
+ goto error_return;
+
+ if (info->hash->creator == abfd->xvec)
+ (*sym_hash)->xcoff = true;
+ }
+
+ *csect_cache = csect;
+
+ esym += (sym.n_numaux + 1) * symesz;
+ sym_hash += sym.n_numaux + 1;
+ csect_cache += sym.n_numaux + 1;
+ if (debug_index != NULL)
+ debug_index += sym.n_numaux + 1;
+ }
+
+ if (new_debug)
+ {
+ /* Update the size of the .debug section we are building. */
+ if (xcoff_hash_table (info)->debug_section == NULL)
+ {
+ asection *n;
+
+ n = bfd_make_section_anyway (abfd, ".debug");
+ if (n == NULL)
+ goto error_return;
+ n->flags |= SEC_HAS_CONTENTS;
+ /* Note that reading from this section will fail. */
+ xcoff_hash_table (info)->debug_section = n;
+ }
+ xcoff_hash_table (info)->debug_section->_raw_size =
+ _bfd_stringtab_size (xcoff_hash_table (info)->debug_strtab);
+ }
+
+ /* Make sure that we have seen all the relocs. */
+ for (sub = abfd->sections; sub != first_csect; sub = sub->next)
+ {
+ /* Reset the section size, since the data is now attached to the
+ csects. */
+ sub->_raw_size = 0;
+
+ if ((sub->flags & SEC_RELOC) != 0)
+ {
+ bfd_size_type i;
+
+ for (i = 0; i < sub->reloc_count; i++)
+ {
+ if (! reloc_info[sub->target_index].used[i])
+ {
+ (*_bfd_error_handler)
+ ("%s: reloc %s:%d not in csect",
+ bfd_get_filename (abfd), sub->name, i);
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+ }
+
+ free (reloc_info[sub->target_index].used);
+ reloc_info[sub->target_index].used = NULL;
+
+ /* Reset SEC_RELOC and the reloc_count, since the reloc
+ information is now attached to the csects. */
+ sub->flags &=~ SEC_RELOC;
+ sub->reloc_count = 0;
+
+ /* If we are not keeping memory, free the reloc information. */
+ if (! info->keep_memory
+ && coff_section_data (abfd, sub) != NULL
+ && coff_section_data (abfd, sub)->relocs != NULL)
+ {
+ free (coff_section_data (abfd, sub)->relocs);
+ coff_section_data (abfd, sub)->relocs = NULL;
+ }
+ }
+ }
+
+ free (reloc_info);
+
+ if (debug_contents != NULL)
+ {
+ free (debug_contents);
+ debug_contents = NULL;
+ }
+
+ return true;
+
+ error_return:
+ if (debug_contents != NULL)
+ free (debug_contents);
+ if (reloc_info != NULL)
+ {
+ for (sub = abfd->sections; sub != NULL; sub = sub->next)
+ {
+ if (reloc_info[sub->target_index].used != NULL)
+ free (reloc_info[sub->target_index].used);
+ }
+ free (reloc_info);
+ }
+ return false;
+}
+\f
+/* Do the final link step. */
+
+boolean
+_bfd_xcoff_bfd_final_link (abfd, info)
+ bfd *abfd;
+ struct bfd_link_info *info;
+{
+ bfd_size_type symesz;
+ struct xcoff_final_link_info finfo;
+ asection *o;
+ struct bfd_link_order *p;
+ size_t max_contents_size;
+ size_t max_sym_count;
+ size_t max_lineno_count;
+ size_t max_reloc_count;
+ size_t 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];
+
+ symesz = bfd_coff_symesz (abfd);
+
+ finfo.info = info;
+ finfo.output_bfd = abfd;
+ finfo.strtab = NULL;
+ finfo.section_info = NULL;
+ finfo.last_file_index = -1;
+ finfo.toc_symindx = -1;
+ finfo.internal_syms = NULL;
+ finfo.sym_indices = NULL;
+ finfo.outsyms = NULL;
+ finfo.linenos = NULL;
+ finfo.contents = NULL;
+ finfo.external_relocs = NULL;
+
+ xcoff_data (abfd)->coff.link_info = info;
+
+ finfo.strtab = _bfd_stringtab_init ();
+ if (finfo.strtab == NULL)
+ goto error_return;
+
+ /* Compute the file positions for all the sections. */
+ if (! abfd->output_has_begun)
+ bfd_coff_compute_section_file_positions (abfd);
+
+ /* Count the line numbers and relocation entries required for the
+ output file. Set the file positions for the relocs. */
+ rel_filepos = obj_relocbase (abfd);
+ relsz = bfd_coff_relsz (abfd);
+ 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;
+ o->lineno_count = 0;
+ for (p = o->link_order_head; p != NULL; p = p->next)
+ {
+ if (p->type == bfd_indirect_link_order)
+ {
+ asection *sec;
+
+ sec = p->u.indirect.section;
+
+ if (info->strip == strip_none
+ || info->strip == strip_some)
+ o->lineno_count += sec->lineno_count;
+
+ o->reloc_count += sec->reloc_count;
+
+ if (sec->_raw_size > max_contents_size)
+ max_contents_size = sec->_raw_size;
+ if (sec->lineno_count > max_lineno_count)
+ max_lineno_count = 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;
+ }
+ if (o->reloc_count == 0)
+ o->rel_filepos = 0;
+ else
+ {
+ o->flags |= SEC_RELOC;
+ o->rel_filepos = rel_filepos;
+ rel_filepos += o->reloc_count * relsz;
+ }
+ }
+
+ /* 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. */
+ finfo.section_info = ((struct xcoff_link_section_info *)
+ malloc ((abfd->section_count + 1)
+ * sizeof (struct xcoff_link_section_info)));
+ if (finfo.section_info == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+ for (i = 0; i <= abfd->section_count; i++)
+ {
+ finfo.section_info[i].relocs = NULL;
+ finfo.section_info[i].rel_hashes = NULL;
+ }
+ }
+
+ /* We now know the size of the relocs, so we can determine the file
+ positions of the line numbers. */
+ line_filepos = rel_filepos;
+ linesz = bfd_coff_linesz (abfd);
+ max_output_reloc_count = 0;
+ 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;
+ }
+
+ if (o->reloc_count != 0)
+ {
+ /* 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. */
+ finfo.section_info[o->target_index].relocs =
+ ((struct internal_reloc *)
+ malloc (o->reloc_count * sizeof (struct internal_reloc)));
+ finfo.section_info[o->target_index].rel_hashes =
+ ((struct xcoff_link_hash_entry **)
+ malloc (o->reloc_count
+ * sizeof (struct xcoff_link_hash_entry *)));
+ if (finfo.section_info[o->target_index].relocs == NULL
+ || finfo.section_info[o->target_index].rel_hashes == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+
+ if (o->reloc_count > max_output_reloc_count)
+ max_output_reloc_count = o->reloc_count;
+ }
+
+ /* 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 4 symbols, since that is the
+ number which xcoff_write_global_symbol may need. */
+ max_sym_count = 4;
+ for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
+ {
+ size_t 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. */
+ finfo.internal_syms = ((struct internal_syment *)
+ malloc (max_sym_count
+ * sizeof (struct internal_syment)));
+ finfo.sym_indices = (long *) malloc (max_sym_count * sizeof (long));
+ finfo.outsyms = ((bfd_byte *)
+ malloc ((size_t) ((max_sym_count + 1) * symesz)));
+ finfo.linenos = (bfd_byte *) malloc (max_lineno_count
+ * bfd_coff_linesz (abfd));
+ finfo.contents = (bfd_byte *) malloc (max_contents_size);
+ finfo.external_relocs = (bfd_byte *) malloc (max_reloc_count * relsz);
+ if ((finfo.internal_syms == NULL && max_sym_count > 0)
+ || (finfo.sym_indices == NULL && max_sym_count > 0)
+ || finfo.outsyms == NULL
+ || (finfo.linenos == NULL && max_lineno_count > 0)
+ || (finfo.contents == NULL && max_contents_size > 0)
+ || (finfo.external_relocs == NULL && max_reloc_count > 0))
+ {
+ bfd_set_error (bfd_error_no_memory);
+ goto error_return;
+ }
+
+ obj_raw_syment_count (abfd) = 0;
+ xcoff_data (abfd)->toc = (bfd_vma) -1;
+
+ /* Write out all the global symbols which do not come from XCOFF
+ input files. In COFF these must come at the end, but in XCOFF it
+ doesn't seem to matter. */
+ xcoff_link_hash_traverse (xcoff_hash_table (info),
+ xcoff_write_global_symbol,
+ (PTR) &finfo);
+
+ /* 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->link_order_head; 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 (&finfo, 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, &finfo, 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. */
+
+ if (finfo.internal_syms != NULL)
+ {
+ free (finfo.internal_syms);
+ finfo.internal_syms = NULL;
+ }
+ if (finfo.sym_indices != NULL)
+ {
+ free (finfo.sym_indices);
+ finfo.sym_indices = NULL;
+ }
+ if (finfo.linenos != NULL)
+ {
+ free (finfo.linenos);
+ finfo.linenos = NULL;
+ }
+ if (finfo.contents != NULL)
+ {
+ free (finfo.contents);
+ finfo.contents = NULL;
+ }
+ if (finfo.external_relocs != NULL)
+ {
+ free (finfo.external_relocs);
+ finfo.external_relocs = NULL;
+ }
+
+ /* The value of the last C_FILE symbol is supposed to be -1. Write
+ it out again. */
+ if (finfo.last_file_index != -1)
+ {
+ finfo.last_file.n_value = -1;
+ bfd_coff_swap_sym_out (abfd, (PTR) &finfo.last_file,
+ (PTR) finfo.outsyms);
+ if (bfd_seek (abfd,
+ (obj_sym_filepos (abfd)
+ + finfo.last_file_index * symesz),
+ SEEK_SET) != 0
+ || bfd_write (finfo.outsyms, symesz, 1, abfd) != symesz)
+ goto error_return;
+ }
+
+ if (finfo.outsyms != NULL)
+ {
+ free (finfo.outsyms);
+ finfo.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. */
+ external_relocs = (bfd_byte *) malloc (max_output_reloc_count * relsz);
+ if (external_relocs == NULL && max_output_reloc_count != 0)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ 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;
+ bfd_byte *erel;
+
+ if (o->reloc_count == 0)
+ continue;
+
+ /* 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 ((PTR) finfo.section_info[o->target_index].relocs,
+ o->reloc_count, sizeof (struct internal_reloc),
+ xcoff_sort_relocs);
+
+ irel = finfo.section_info[o->target_index].relocs;
+ irelend = irel + o->reloc_count;
+ rel_hash = finfo.section_info[o->target_index].rel_hashes;
+ erel = external_relocs;
+ for (; irel < irelend; irel++, rel_hash++, erel += relsz)
+ {
+ if (*rel_hash != NULL)
+ {
+ if ((*rel_hash)->indx < 0)
+ {
+ if (! ((*info->callbacks->unattached_reloc)
+ (info, (*rel_hash)->root.root.string, abfd, o,
+ irel->r_vaddr)))
+ goto error_return;
+ (*rel_hash)->indx = 0;
+ }
+ irel->r_symndx = (*rel_hash)->indx;
+ }
+ bfd_coff_swap_reloc_out (abfd, (PTR) irel, (PTR) erel);
+ }
+
+ if (bfd_seek (abfd, o->rel_filepos, SEEK_SET) != 0
+ || bfd_write ((PTR) external_relocs, relsz, o->reloc_count,
+ abfd) != relsz * o->reloc_count)
+ goto error_return;
+ }
+
+ if (external_relocs != NULL)
+ {
+ free (external_relocs);
+ external_relocs = NULL;
+ }
+
+ /* Free up the section information. */
+ if (finfo.section_info != NULL)
+ {
+ unsigned int i;
+
+ for (i = 0; i < abfd->section_count; i++)
+ {
+ if (finfo.section_info[i].relocs != NULL)
+ free (finfo.section_info[i].relocs);
+ if (finfo.section_info[i].rel_hashes != NULL)
+ free (finfo.section_info[i].rel_hashes);
+ }
+ free (finfo.section_info);
+ finfo.section_info = NULL;
+ }
+
+ /* Write out the string table. */
+ if (bfd_seek (abfd,
+ (obj_sym_filepos (abfd)
+ + obj_raw_syment_count (abfd) * symesz),
+ SEEK_SET) != 0)
+ goto error_return;
+ bfd_h_put_32 (abfd,
+ _bfd_stringtab_size (finfo.strtab) + STRING_SIZE_SIZE,
+ (bfd_byte *) strbuf);
+ if (bfd_write (strbuf, 1, STRING_SIZE_SIZE, abfd) != STRING_SIZE_SIZE)
+ goto error_return;
+ if (! _bfd_stringtab_emit (abfd, finfo.strtab))
+ goto error_return;
+
+ _bfd_stringtab_free (finfo.strtab);
+
+ /* Write out the debugging string table. */
+ o = xcoff_hash_table (info)->debug_section;
+ if (o != NULL)
+ {
+ struct bfd_strtab_hash *debug_strtab;
+
+ debug_strtab = xcoff_hash_table (info)->debug_strtab;
+ BFD_ASSERT (o->output_section->_raw_size - o->output_offset
+ >= _bfd_stringtab_size (debug_strtab));
+ if (bfd_seek (abfd,
+ o->output_section->filepos + o->output_offset,
+ SEEK_SET) != 0)
+ goto error_return;
+ if (! _bfd_stringtab_emit (abfd, debug_strtab))
+ goto error_return;
+ }
+
+ /* Setting bfd_get_symcount to 0 will cause write_object_contents to
+ not try to write out the symbols. */
+ bfd_get_symcount (abfd) = 0;
+
+ return true;
+
+ error_return:
+ if (finfo.strtab != NULL)
+ _bfd_stringtab_free (finfo.strtab);
+ if (finfo.section_info != NULL)
+ {
+ unsigned int i;
+
+ for (i = 0; i < abfd->section_count; i++)
+ {
+ if (finfo.section_info[i].relocs != NULL)
+ free (finfo.section_info[i].relocs);
+ if (finfo.section_info[i].rel_hashes != NULL)
+ free (finfo.section_info[i].rel_hashes);
+ }
+ free (finfo.section_info);
+ }
+ if (finfo.internal_syms != NULL)
+ free (finfo.internal_syms);
+ if (finfo.sym_indices != NULL)
+ free (finfo.sym_indices);
+ if (finfo.outsyms != NULL)
+ free (finfo.outsyms);
+ if (finfo.linenos != NULL)
+ free (finfo.linenos);
+ if (finfo.contents != NULL)
+ free (finfo.contents);
+ if (finfo.external_relocs != NULL)
+ free (finfo.external_relocs);
+ if (external_relocs != NULL)
+ free (external_relocs);
+ return false;
+}
+
+/* Link an input file into the linker output file. This function
+ handles all the sections and relocations of the input file at once. */
+
+static boolean
+xcoff_link_input_bfd (finfo, input_bfd)
+ struct xcoff_final_link_info *finfo;
+ bfd *input_bfd;
+{
+ bfd *output_bfd;
+ const char *strings;
+ bfd_size_type syment_base;
+ unsigned int n_tmask;
+ unsigned int n_btshft;
+ boolean copy, hash;
+ bfd_size_type isymesz;
+ bfd_size_type osymesz;
+ bfd_size_type linesz;
+ bfd_byte *esym;
+ bfd_byte *esym_end;
+ struct internal_syment *isymp;
+ asection **csectpp;
+ unsigned long *debug_index;
+ long *indexp;
+ unsigned long output_index;
+ bfd_byte *outsym;
+ struct xcoff_link_hash_entry **sym_hash;
+ boolean keep_syms;
+ asection *o;
+
+ /* Move all the symbols to the output file. */
+
+ output_bfd = finfo->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 (! finfo->info->keep_memory)
+ copy = true;
+ hash = true;
+ if ((output_bfd->flags & BFD_TRADITIONAL_FORMAT) != 0)
+ hash = false;
+
+ if (! _bfd_coff_get_external_symbols (input_bfd))
+ return false;
+
+ 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 = finfo->internal_syms;
+ indexp = finfo->sym_indices;
+ output_index = syment_base;
+ outsym = finfo->outsyms;
+
+ while (esym < esym_end)
+ {
+ struct internal_syment isym;
+ union internal_auxent aux;
+ int smtyp = 0;
+ boolean skip;
+ boolean require;
+ int add;
+
+ bfd_coff_swap_sym_in (input_bfd, (PTR) esym, (PTR) isymp);
+
+ /* If this is a C_EXT or C_HIDEXT symbol, we need the csect
+ information. */
+ if (isymp->n_sclass == C_EXT || isymp->n_sclass == C_HIDEXT)
+ {
+ BFD_ASSERT (isymp->n_numaux > 0);
+ bfd_coff_swap_aux_in (input_bfd,
+ (PTR) (esym + isymesz * isymp->n_numaux),
+ isymp->n_type, isymp->n_sclass,
+ isymp->n_numaux - 1, isymp->n_numaux,
+ (PTR) &aux);
+ smtyp = SMTYP_SMTYP (aux.x_csect.x_smtyp);
+ }
+
+ /* Make a copy of *isymp so that the relocate_section function
+ always sees the original values. This is more reliable than
+ always recomputing the symbol value even if we are stripping
+ the symbol. */
+ isym = *isymp;
+
+ *indexp = -1;
+
+ skip = false;
+ require = false;
+ add = 1 + isym.n_numaux;
+
+ /* If we are skipping this csect, we want to skip this symbol. */
+ if (*csectpp == NULL)
+ skip = true;
+
+ /* An XCOFF linker always skips C_STAT symbols. */
+ if (! skip
+ && isymp->n_sclass == C_STAT)
+ skip = true;
+
+ /* We skip all but the first TOC anchor. */
+ if (! skip
+ && isymp->n_sclass == C_HIDEXT
+ && aux.x_csect.x_smclas == XMC_TC0)
+ {
+ if (finfo->toc_symindx != -1)
+ skip = true;
+ else
+ {
+ finfo->toc_symindx = output_index;
+ xcoff_data (finfo->output_bfd)->toc =
+ ((*csectpp)->output_section->vma
+ + (*csectpp)->output_offset
+ + isym.n_value
+ - (*csectpp)->vma);
+ require = true;
+ }
+ }
+
+ /* If we are stripping all symbols, we want to skip this one. */
+ if (! skip
+ && finfo->info->strip == strip_all)
+ skip = true;
+
+ /* We can skip resolved external references. */
+ if (! skip
+ && isym.n_sclass == C_EXT
+ && smtyp == XTY_ER
+ && (*sym_hash)->root.type != bfd_link_hash_undefined)
+ skip = true;
+
+ /* Skip local symbols if we are discarding them. */
+ if (! skip
+ && finfo->info->discard == discard_all
+ && isym.n_sclass != C_EXT
+ && (isym.n_sclass != C_HIDEXT
+ || smtyp != XTY_SD))
+ skip = true;
+
+ /* If we stripping debugging symbols, and this is a debugging
+ symbol, then skip it. */
+ if (! skip
+ && finfo->info->strip == strip_debugger
+ && isym.n_scnum == N_DEBUG)
+ skip = true;
+
+ /* If some symbols are stripped based on the name, work out the
+ name and decide whether to skip this symbol. We don't handle
+ this correctly for symbols whose names are in the .debug
+ section; to get it right we would need a new bfd_strtab_hash
+ function to return the string given the index. */
+ if (! skip
+ && (finfo->info->strip == strip_some
+ || finfo->info->discard == discard_l)
+ && (debug_index == NULL || *debug_index == (unsigned long) -1))
+ {
+ const char *name;
+ char buf[SYMNMLEN + 1];
+
+ name = _bfd_coff_internal_syment_name (input_bfd, &isym, buf);
+ if (name == NULL)
+ return false;
+
+ if ((finfo->info->strip == strip_some
+ && (bfd_hash_lookup (finfo->info->keep_hash, name, false,
+ false) == NULL))
+ || (finfo->info->discard == discard_l
+ && (isym.n_sclass != C_EXT
+ && (isym.n_sclass != C_HIDEXT
+ || smtyp != XTY_SD))
+ && strncmp (name, finfo->info->lprefix,
+ finfo->info->lprefix_len) == 0))
+ skip = true;
+ }
+
+ /* On the other hand, we can't skip global symbols which have
+ relocs against them. FIXME: This won't always work, because
+ we're not always outputting the global symbols at the end, as
+ we do for COFF. */
+ if (skip
+ && *sym_hash != NULL
+ && (*sym_hash)->indx == -2
+ && finfo->info->strip != strip_all)
+ skip = false;
+
+ /* We can not skip the first TOC anchor. */
+ if (skip
+ && require
+ && finfo->info->strip != strip_all)
+ skip = false;
+
+ /* We now know whether we are to skip this symbol or not. */
+ if (! skip)
+ {
+ /* Adjust the symbol in order to output it. */
+
+ 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 != NULL && *debug_index != (unsigned long) -1)
+ 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,
+ (char *) NULL);
+ if (name == NULL)
+ return false;
+ indx = _bfd_stringtab_add (finfo->strtab, name, hash, copy);
+ if (indx == (bfd_size_type) -1)
+ return false;
+ isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
+ }
+ }
+
+ if (isym.n_sclass == C_BSTAT)
+ {
+ unsigned long indx;
+
+ /* The value of a C_BSTAT symbol is the symbol table
+ index of the containing csect. */
+
+ indx = isym.n_value;
+ if (indx < obj_raw_syment_count (input_bfd))
+ {
+ long symindx;
+
+ symindx = finfo->sym_indices[indx];
+ if (symindx < 0)
+ isym.n_value = 0;
+ else
+ isym.n_value = symindx;
+ }
+ }
+ else if (isym.n_scnum > 0)
+ {
+ isym.n_scnum = (*csectpp)->output_section->target_index;
+ isym.n_value += ((*csectpp)->output_section->vma
+ + (*csectpp)->output_offset
+ - (*csectpp)->vma);
+ }
+
+ /* 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 (finfo->last_file_index != -1
+ && finfo->last_file.n_value != (long) output_index)
+ {
+ /* We must correct the value of the last C_FILE entry. */
+ finfo->last_file.n_value = output_index;
+ if ((bfd_size_type) finfo->last_file_index >= syment_base)
+ {
+ /* The last C_FILE symbol is in this input file. */
+ bfd_coff_swap_sym_out (output_bfd,
+ (PTR) &finfo->last_file,
+ (PTR) (finfo->outsyms
+ + ((finfo->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. */
+ bfd_coff_swap_sym_out (output_bfd,
+ (PTR) &finfo->last_file,
+ (PTR) outsym);
+ if (bfd_seek (output_bfd,
+ (obj_sym_filepos (output_bfd)
+ + finfo->last_file_index * osymesz),
+ SEEK_SET) != 0
+ || (bfd_write (outsym, osymesz, 1, output_bfd)
+ != osymesz))
+ return false;
+ }
+ }
+
+ finfo->last_file_index = output_index;
+ finfo->last_file = isym;
+ }
+
+ /* Output the symbol. */
+
+ bfd_coff_swap_sym_out (output_bfd, (PTR) &isym, (PTR) outsym);
+
+ *indexp = output_index;
+
+ if (isym.n_sclass == C_EXT)
+ {
+ long indx;
+ struct xcoff_link_hash_entry *h;
+
+ indx = ((esym - (bfd_byte *) obj_coff_external_syms (input_bfd))
+ / isymesz);
+ h = obj_xcoff_sym_hashes (input_bfd)[indx];
+ BFD_ASSERT (h != NULL);
+ h->indx = output_index;
+ }
+
+ output_index += add;
+ outsym += add * osymesz;
+ }
+
+ esym += add * isymesz;
+ isymp += add;
+ csectpp += add;
+ sym_hash += add;
+ if (debug_index != NULL)
+ debug_index += add;
+ ++indexp;
+ for (--add; add > 0; --add)
+ *indexp++ = -1;
+ }
+
+ /* Fix up the aux entries. This must be done in a separate pass,
+ because we don't know the correct symbol indices until we have
+ already decided which symbols we are going to keep. */
+
+ esym = (bfd_byte *) obj_coff_external_syms (input_bfd);
+ esym_end = esym + obj_raw_syment_count (input_bfd) * isymesz;
+ isymp = finfo->internal_syms;
+ indexp = finfo->sym_indices;
+ outsym = finfo->outsyms;
+ while (esym < esym_end)
+ {
+ int add;
+
+ add = 1 + isymp->n_numaux;
+
+ if (*indexp < 0)
+ esym += add * isymesz;
+ else
+ {
+ int i;
+
+ 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, (PTR) esym, isymp->n_type,
+ isymp->n_sclass, i, isymp->n_numaux,
+ (PTR) &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_zeroes == 0
+ && aux.x_file.x_n.x_offset != 0)
+ {
+ const char *filename;
+ bfd_size_type indx;
+
+ BFD_ASSERT (aux.x_file.x_n.x_offset
+ >= STRING_SIZE_SIZE);
+ if (strings == NULL)
+ {
+ strings = _bfd_coff_read_string_table (input_bfd);
+ if (strings == NULL)
+ return false;
+ }
+ filename = strings + aux.x_file.x_n.x_offset;
+ indx = _bfd_stringtab_add (finfo->strtab, filename,
+ hash, copy);
+ if (indx == (bfd_size_type) -1)
+ return false;
+ aux.x_file.x_n.x_offset = STRING_SIZE_SIZE + indx;
+ }
+ }
+ else if ((isymp->n_sclass == C_EXT
+ || isymp->n_sclass == C_HIDEXT)
+ && 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 = finfo->sym_indices[indx];
+ if (symindx < 0)
+ aux.x_sym.x_tagndx.l = 0;
+ else
+ aux.x_sym.x_tagndx.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)
+ {
+ 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 (finfo->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 = finfo->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 = finfo->sym_indices[indx];
+ if (symindx < 0)
+ aux.x_sym.x_tagndx.l = 0;
+ else
+ aux.x_sym.x_tagndx.l = symindx;
+ }
+ }
+
+ bfd_coff_swap_aux_out (output_bfd, (PTR) &aux, isymp->n_type,
+ isymp->n_sclass, i, isymp->n_numaux,
+ (PTR) outsym);
+ outsym += osymesz;
+ esym += isymesz;
+ }
+ }
+
+ indexp += add;
+ isymp += add;
+ }
+
+ /* Relocate the line numbers, unless we are stripping them. */
+ if (finfo->info->strip == strip_none
+ || finfo->info->strip == strip_some)
+ {
+ for (o = input_bfd->sections; o != NULL; o = o->next)
+ {
+ bfd_vma offset;
+ bfd_byte *eline;
+ bfd_byte *elineend;
+
+ /* FIXME: If SEC_HAS_CONTENTS is not set for the section,
+ then build_link_order in ldwrite.c will not have created
+ a link order, which means that we will not have seen this
+ input section in _bfd_xcoff_final_link, which means that
+ we will not have allocated space for the line numbers of
+ this section. I don't think line numbers can be
+ meaningful for a section which does not have
+ SEC_HAS_CONTENTS set, but, if they do, this must be
+ changed. */
+ if (o->lineno_count == 0
+ || (o->output_section->flags & SEC_HAS_CONTENTS) == 0)
+ continue;
+
+ if (bfd_seek (input_bfd, o->line_filepos, SEEK_SET) != 0
+ || bfd_read (finfo->linenos, linesz, o->lineno_count,
+ input_bfd) != linesz * o->lineno_count)
+ return false;
+
+ offset = o->output_section->vma + o->output_offset - o->vma;
+ eline = finfo->linenos;
+ elineend = eline + linesz * o->lineno_count;
+ for (; eline < elineend; eline += linesz)
+ {
+ struct internal_lineno iline;
+
+ bfd_coff_swap_lineno_in (input_bfd, (PTR) eline, (PTR) &iline);
+
+ if (iline.l_lnno != 0)
+ iline.l_addr.l_paddr += offset;
+ else if (iline.l_addr.l_symndx >= 0
+ && ((unsigned long) iline.l_addr.l_symndx
+ < obj_raw_syment_count (input_bfd)))
+ {
+ long indx;
+
+ indx = finfo->sym_indices[iline.l_addr.l_symndx];
+
+ if (indx < 0)
+ {
+ /* These line numbers are attached to a symbol
+ which we are stripping. We should really
+ just discard the line numbers, but that would
+ be a pain because we have already counted
+ them. */
+ indx = 0;
+ }
+ else
+ {
+ struct internal_syment is;
+ union internal_auxent ia;
+
+ /* Fix up the lnnoptr field in the aux entry of
+ the symbol. It turns out that we can't do
+ this when we modify the symbol aux entries,
+ because gas sometimes screws up the lnnoptr
+ field and makes it an offset from the start
+ of the line numbers rather than an absolute
+ file index. */
+ bfd_coff_swap_sym_in (output_bfd,
+ (PTR) (finfo->outsyms
+ + ((indx - syment_base)
+ * osymesz)),
+ (PTR) &is);
+ if ((ISFCN (is.n_type)
+ || is.n_sclass == C_BLOCK)
+ && ((is.n_sclass == C_EXT
+ || is.n_sclass == C_HIDEXT)
+ ? is.n_numaux >= 2
+ : is.n_numaux >= 1))
+ {
+ PTR auxptr;
+
+ auxptr = (PTR) (finfo->outsyms
+ + ((indx - syment_base + 1)
+ * osymesz));
+ bfd_coff_swap_aux_in (output_bfd, auxptr,
+ is.n_type, is.n_sclass,
+ 0, is.n_numaux, (PTR) &ia);
+ ia.x_sym.x_fcnary.x_fcn.x_lnnoptr =
+ (o->output_section->line_filepos
+ + o->output_section->lineno_count * linesz
+ + eline - finfo->linenos);
+ bfd_coff_swap_aux_out (output_bfd, (PTR) &ia,
+ is.n_type, is.n_sclass, 0,
+ is.n_numaux, auxptr);
+ }
+ }
+
+ iline.l_addr.l_symndx = indx;
+ }
+
+ bfd_coff_swap_lineno_out (output_bfd, (PTR) &iline, (PTR) eline);
+ }
+
+ if (bfd_seek (output_bfd,
+ (o->output_section->line_filepos
+ + o->output_section->lineno_count * linesz),
+ SEEK_SET) != 0
+ || bfd_write (finfo->linenos, linesz, o->lineno_count,
+ output_bfd) != linesz * o->lineno_count)
+ return false;
+
+ o->output_section->lineno_count += o->lineno_count;
+ }
+ }
+
+ /* 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 (finfo->last_file_index != -1
+ && (bfd_size_type) finfo->last_file_index >= syment_base)
+ {
+ finfo->last_file.n_value = output_index;
+ bfd_coff_swap_sym_out (output_bfd, (PTR) &finfo->last_file,
+ (PTR) (finfo->outsyms
+ + ((finfo->last_file_index - syment_base)
+ * osymesz)));
+ }
+
+ /* Write the modified symbols to the output file. */
+ if (outsym > finfo->outsyms)
+ {
+ if (bfd_seek (output_bfd,
+ obj_sym_filepos (output_bfd) + syment_base * osymesz,
+ SEEK_SET) != 0
+ || (bfd_write (finfo->outsyms, outsym - finfo->outsyms, 1,
+ output_bfd)
+ != (bfd_size_type) (outsym - finfo->outsyms)))
+ return false;
+
+ BFD_ASSERT ((obj_raw_syment_count (output_bfd)
+ + (outsym - finfo->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->flags & SEC_HAS_CONTENTS) == 0
+ || o->_raw_size == 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
+ {
+ if (! bfd_get_section_contents (input_bfd, o, finfo->contents,
+ (file_ptr) 0, o->_raw_size))
+ return false;
+ contents = finfo->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;
+
+ /* Read in the relocs. We have set rel_filepos correctly
+ for the sections we created to represent csects, so this
+ should work. */
+ target_index = o->output_section->target_index;
+ internal_relocs = (_bfd_coff_read_internal_relocs
+ (input_bfd, o, false, finfo->external_relocs,
+ true,
+ (finfo->section_info[target_index].relocs
+ + o->output_section->reloc_count)));
+ if (internal_relocs == NULL)
+ return false;
+
+ /* Call processor specific code to relocate the section
+ contents. */
+ if (! bfd_coff_relocate_section (output_bfd, finfo->info,
+ input_bfd, o,
+ contents,
+ internal_relocs,
+ finfo->internal_syms,
+ xcoff_data (input_bfd)->csects))
+ return false;
+
+ offset = o->output_section->vma + o->output_offset - o->vma;
+ irel = internal_relocs;
+ irelend = irel + o->reloc_count;
+ rel_hash = (finfo->section_info[target_index].rel_hashes
+ + o->output_section->reloc_count);
+ for (; irel < irelend; irel++, rel_hash++)
+ {
+ struct xcoff_link_hash_entry *h;
+
+ *rel_hash = NULL;
+
+ /* Adjust the reloc address and symbol index. */
+
+ irel->r_vaddr += offset;
+
+ if (irel->r_symndx == -1)
+ continue;
+
+ h = obj_xcoff_sym_hashes (input_bfd)[irel->r_symndx];
+ 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 = finfo->sym_indices[irel->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 = finfo->internal_syms + irel->r_symndx;
+ if (is->n_sclass == C_HIDEXT
+ && is->n_numaux > 0)
+ {
+ PTR auxptr;
+ union internal_auxent aux;
+
+ auxptr = (PTR) (((bfd_byte *)
+ obj_coff_external_syms (input_bfd))
+ + ((irel->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,
+ (PTR) &aux);
+ if (SMTYP_SMTYP (aux.x_csect.x_smtyp) == XTY_SD
+ && aux.x_csect.x_smclas == XMC_TC0)
+ indx = finfo->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 = finfo->internal_syms + irel->r_symndx;
+
+ name = (_bfd_coff_internal_syment_name
+ (input_bfd, is, buf));
+ if (name == NULL)
+ return false;
+
+ if (! ((*finfo->info->callbacks->unattached_reloc)
+ (finfo->info, name, input_bfd, o,
+ irel->r_vaddr)))
+ return false;
+ }
+ }
+ }
+
+ 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, o->output_offset,
+ (o->_cooked_size != 0
+ ? o->_cooked_size
+ : o->_raw_size)))
+ return false;
+ }
+
+ obj_coff_keep_syms (input_bfd) = keep_syms;
+
+ if (! finfo->info->keep_memory)
+ {
+ if (! _bfd_coff_free_symbols (input_bfd))
+ return false;
+ }
+
+ return true;
+}
+
+/* Write out a non-XCOFF global symbol. */
+
+static boolean
+xcoff_write_global_symbol (h, p)
+ struct xcoff_link_hash_entry *h;
+ PTR p;
+{
+ struct xcoff_final_link_info *finfo = (struct xcoff_final_link_info *) p;
+ bfd *output_bfd;
+ bfd_byte *outsym;
+ struct internal_syment isym;
+ union internal_auxent aux;
+
+ /* XCOFF global symbols will be written out in xcoff_link_input_bfd.
+ The only symbols we need to handle here are those from non-XCOFF
+ files and from the linker script. */
+ if (h->xcoff)
+ return true;
+
+ output_bfd = finfo->output_bfd;
+ outsym = finfo->outsyms;
+
+ memset (&aux, 0, sizeof aux);
+
+ h->indx = obj_raw_syment_count (output_bfd);
+
+ if (strlen (h->root.root.string) <= SYMNMLEN)
+ strncpy (isym._n._n_name, h->root.root.string, SYMNMLEN);
+ else
+ {
+ boolean hash;
+ bfd_size_type indx;
+
+ hash = true;
+ if ((output_bfd->flags & BFD_TRADITIONAL_FORMAT) != 0)
+ hash = false;
+ indx = _bfd_stringtab_add (finfo->strtab, h->root.root.string, hash,
+ false);
+ if (indx == (bfd_size_type) -1)
+ return false;
+ isym._n._n_n._n_zeroes = 0;
+ isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
+ }
+
+ if (h->root.type == bfd_link_hash_undefined
+ || h->root.type == bfd_link_hash_undefweak)
+ {
+ isym.n_value = 0;
+ isym.n_scnum = N_UNDEF;
+ 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)
+ {
+ isym.n_value = (h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset
+ + h->root.u.def.value);
+ isym.n_scnum = h->root.u.def.section->output_section->target_index;
+ isym.n_sclass = C_HIDEXT;
+ aux.x_csect.x_smtyp = XTY_SD;
+ /* I don't know what the csect length should be in this case. */
+ }
+ else
+ abort ();
+
+ isym.n_type = T_NULL;
+ isym.n_numaux = 1;
+
+ bfd_coff_swap_sym_out (output_bfd, (PTR) &isym, (PTR) outsym);
+ outsym += bfd_coff_symesz (output_bfd);
+
+ aux.x_csect.x_smclas = XMC_UA;
+
+ bfd_coff_swap_aux_out (output_bfd, (PTR) &aux, T_NULL, isym.n_sclass, 0, 1,
+ (PTR) outsym);
+ outsym += bfd_coff_auxesz (output_bfd);
+
+ if ((h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && aux.x_csect.x_smclas != XMC_TC0)
+ {
+ /* We just output an SD symbol. Now output an LD symbol. */
+
+ h->indx += 2;
+
+ isym.n_sclass = C_EXT;
+ bfd_coff_swap_sym_out (output_bfd, (PTR) &isym, (PTR) 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, (PTR) &aux, T_NULL, C_EXT, 0, 1,
+ (PTR) outsym);
+ outsym += bfd_coff_auxesz (output_bfd);
+ }
+
+ if (bfd_seek (output_bfd,
+ (obj_sym_filepos (output_bfd)
+ + (obj_raw_syment_count (output_bfd)
+ * bfd_coff_symesz (output_bfd))),
+ SEEK_SET) != 0
+ || (bfd_write (finfo->outsyms, outsym - finfo->outsyms, 1, output_bfd)
+ != (bfd_size_type) (outsym - finfo->outsyms)))
+ return false;
+ obj_raw_syment_count (output_bfd) +=
+ (outsym - finfo->outsyms) / bfd_coff_symesz (output_bfd);
+
+ return true;
+}
+
+/* Handle a link order which is supposed to generate a reloc. */
+
+static boolean
+xcoff_reloc_link_order (output_bfd, finfo, output_section, link_order)
+ bfd *output_bfd;
+ struct xcoff_final_link_info *finfo;
+ asection *output_section;
+ struct bfd_link_order *link_order;
+{
+ reloc_howto_type *howto;
+ struct internal_reloc *irel;
+ struct xcoff_link_hash_entry **rel_hash_ptr;
+
+ 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;
+ }
+
+ if (link_order->u.reloc.p->addend != 0)
+ {
+ bfd_size_type size;
+ bfd_byte *buf;
+ bfd_reloc_status_type rstat;
+ boolean ok;
+
+ size = bfd_get_reloc_size (howto);
+ buf = (bfd_byte *) bfd_zmalloc (size);
+ if (buf == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ return false;
+ }
+
+ rstat = _bfd_relocate_contents (howto, output_bfd,
+ link_order->u.reloc.p->addend, buf);
+ switch (rstat)
+ {
+ case bfd_reloc_ok:
+ break;
+ default:
+ case bfd_reloc_outofrange:
+ abort ();
+ case bfd_reloc_overflow:
+ if (! ((*finfo->info->callbacks->reloc_overflow)
+ (finfo->info,
+ (link_order->type == bfd_section_reloc_link_order
+ ? bfd_section_name (output_bfd,
+ link_order->u.reloc.p->u.section)
+ : link_order->u.reloc.p->u.name),
+ howto->name, link_order->u.reloc.p->addend,
+ (bfd *) NULL, (asection *) NULL, (bfd_vma) 0)))
+ {
+ free (buf);
+ return false;
+ }
+ break;
+ }
+ ok = bfd_set_section_contents (output_bfd, output_section, (PTR) 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 = (finfo->section_info[output_section->target_index].relocs
+ + output_section->reloc_count);
+ rel_hash_ptr = (finfo->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 (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 ();
+ *rel_hash_ptr = NULL;
+ irel->r_symndx = 0;
+ }
+ else
+ {
+ struct xcoff_link_hash_entry *h;
+
+ h = xcoff_link_hash_lookup (xcoff_hash_table (finfo->info),
+ link_order->u.reloc.p->u.name,
+ false, false, true);
+ if (h != NULL)
+ {
+ 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;
+ }
+ }
+ else
+ {
+ if (! ((*finfo->info->callbacks->unattached_reloc)
+ (finfo->info, link_order->u.reloc.p->u.name, (bfd *) NULL,
+ (asection *) NULL, (bfd_vma) 0)))
+ return false;
+ 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;
+
+ return true;
+}
+
+/* Sort relocs by VMA. This is called via qsort. */
+
+static int
+xcoff_sort_relocs (p1, p2)
+ const PTR p1;
+ const PTR 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;
+}
+
+/* This is the relocation function for the RS/6000/POWER/PowerPC.
+ This is currently the only processor which uses XCOFF; I hope that
+ will never change. */
+
+boolean
+_bfd_ppc_xcoff_relocate_section (output_bfd, info, input_bfd,
+ input_section, contents, relocs, syms,
+ sections)
+ bfd *output_bfd;
+ struct bfd_link_info *info;
+ bfd *input_bfd;
+ asection *input_section;
+ bfd_byte *contents;
+ struct internal_reloc *relocs;
+ struct internal_syment *syms;
+ asection **sections;
+{
+ struct internal_reloc *rel;
+ struct internal_reloc *relend;
+
+ rel = relocs;
+ relend = rel + input_section->reloc_count;
+ for (; rel < relend; rel++)
+ {
+ long symndx;
+ struct xcoff_link_hash_entry *h;
+ struct internal_syment *sym;
+ bfd_vma addend;
+ bfd_vma val;
+ struct reloc_howto_struct howto;
+ bfd_reloc_status_type rstat;
+
+ /* Relocation type 0x0f is a special relocation type which is
+ merely used to prevent garbage collection from occurring for
+ the csect including the symbol which it references. */
+ if (rel->r_type == 0x0f)
+ continue;
+
+ symndx = rel->r_symndx;
+
+ if (symndx == -1)
+ {
+ h = NULL;
+ sym = NULL;
+ addend = 0;
+ }
+ else
+ {
+ h = obj_xcoff_sym_hashes (input_bfd)[symndx];
+ sym = syms + symndx;
+ addend = - sym->n_value;
+ }
+
+ /* We build the howto information on the fly. */
+
+ howto.type = rel->r_type;
+ howto.rightshift = 0;
+ howto.size = 2;
+ howto.bitsize = (rel->r_size & 0x1f) + 1;
+ howto.pc_relative = false;
+ howto.bitpos = 0;
+ if ((rel->r_size & 0x80) != 0)
+ howto.complain_on_overflow = complain_overflow_signed;
+ else
+ howto.complain_on_overflow = complain_overflow_bitfield;
+ howto.special_function = NULL;
+ howto.name = "internal";
+ howto.partial_inplace = true;
+ if (howto.bitsize == 32)
+ howto.src_mask = howto.dst_mask = 0xffffffff;
+ else
+ {
+ howto.src_mask = howto.dst_mask = (1 << howto.bitsize) - 1;
+ if (howto.bitsize == 16)
+ howto.size = 1;
+ }
+ howto.pcrel_offset = false;
+
+ val = 0;
+
+ if (h == NULL)
+ {
+ asection *sec;
+
+ if (symndx == -1)
+ {
+ sec = bfd_abs_section_ptr;
+ val = 0;
+ }
+ else
+ {
+ sec = sections[symndx];
+ val = (sec->output_section->vma
+ + sec->output_offset
+ + sym->n_value
+ - sec->vma);
+ }
+ }
+ else
+ {
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ {
+ asection *sec;
+
+ sec = h->root.u.def.section;
+ val = (h->root.u.def.value
+ + sec->output_section->vma
+ + sec->output_offset);
+ }
+ else if (! info->relocateable)
+ {
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, h->root.root.string, input_bfd, input_section,
+ rel->r_vaddr - input_section->vma)))
+ return false;
+ }
+ }
+
+ /* I took the relocation type definitions from two documents:
+ the PowerPC AIX Version 4 Application Binary Interface, First
+ Edition (April 1992), and the PowerOpen ABI, Big-Endian
+ 32-Bit Hardware Implementation (June 30, 1994). Differences
+ between the documents are noted below. */
+
+ switch (rel->r_type)
+ {
+ case 0x04:
+ case 0x14:
+ case 0x15:
+ /* These relocs are defined by the PowerPC ABI to be
+ relative branches which use half of the difference
+ between the symbol and the program counter. I can't
+ quite figure out when this is useful. These relocs are
+ not defined by the PowerOpen ABI. */
+ default:
+ (*_bfd_error_handler)
+ ("%s: unsupported relocation type 0x%02x",
+ bfd_get_filename (input_bfd), (unsigned int) rel->r_type);
+ bfd_set_error (bfd_error_bad_value);
+ return false;
+ case 0x00:
+ /* Simple positive relocation. */
+ break;
+ case 0x01:
+ /* Simple negative relocation. */
+ val = - val;
+ break;
+ case 0x02:
+ /* Simple PC relative relocation. */
+ howto.pc_relative = true;
+ break;
+ case 0x03:
+ /* TOC relative relocation. The value in the instruction in
+ the input file is the offset from the input file TOC to
+ the desired location. We want the offset from the final
+ TOC to the desired location. We have:
+ isym = iTOC + in
+ iinsn = in + o
+ osym = oTOC + on
+ oinsn = on + o
+ so we must change insn by on - in.
+ */
+ case 0x05:
+ /* Global linkage relocation. The value of this relocation
+ is the address of the entry in the TOC section. */
+ case 0x06:
+ /* Local object TOC address. I can't figure out the
+ difference between this and case 0x05. */
+ case 0x12:
+ /* TOC relative relocation. A TOC relative load instruction
+ which may be changed to a load address instruction.
+ FIXME: We don't currently implement this optimization. */
+ case 0x13:
+ /* TOC relative relocation. This is a TOC relative load
+ address instruction which may be changed to a load
+ instruction. FIXME: I don't know if this is the correct
+ implementation. */
+ val = ((val - xcoff_data (output_bfd)->toc)
+ - (sym->n_value - xcoff_data (input_bfd)->toc));
+ addend = 0;
+ break;
+ case 0x08:
+ /* Absolute branch. We don't want to mess with the lower
+ two bits of the instruction. */
+ case 0x16:
+ /* The PowerPC ABI defines this as an absolute call which
+ may be modified to become a relative call. The PowerOpen
+ ABI does not define this relocation type. */
+ case 0x18:
+ /* Absolute branch which may be modified to become a
+ relative branch. */
+ case 0x19:
+ /* The PowerPC ABI defines this as an absolute branch to a
+ fixed address which may be modified to an absolute branch
+ to a symbol. The PowerOpen ABI does not define this
+ relocation type. */
+ case 0x1b:
+ /* The PowerPC ABI defines this as an absolute branch to a
+ fixed address which may be modified to a relative branch.
+ The PowerOpen ABI does not define this relocation type. */
+ howto.src_mask &= ~3;
+ howto.dst_mask = howto.src_mask;
+ break;
+ case 0x0a:
+ /* Relative branch. We don't want to mess with the lower
+ two bits of the instruction. */
+ case 0x17:
+ /* The PowerPC ABI defines this as a relative call which may
+ be modified to become an absolute call. The PowerOpen
+ ABI does not define this relocation type. */
+ case 0x1a:
+ /* A relative branch which may be modified to become an
+ absolute branch. FIXME: We don't implement this,
+ although we should for symbols of storage mapping class
+ XMC_XO. */
+ howto.pc_relative = true;
+ howto.src_mask &= ~3;
+ howto.dst_mask = howto.src_mask;
+ break;
+ case 0x0c:
+ /* The PowerPC AIX ABI describes this as a load which may be
+ changed to a load address. The PowerOpen ABI says this
+ is the same as case 0x00. */
+ break;
+ case 0x0d:
+ /* The PowerPC AIX ABI describes this as a load address
+ which may be changed to a load. The PowerOpen ABI says
+ this is the same as case 0x00. */
+ break;
+ }
+
+ rstat = _bfd_final_link_relocate (&howto, input_bfd, input_section,
+ contents,
+ rel->r_vaddr - input_section->vma,
+ val, addend);
+
+ switch (rstat)
+ {
+ default:
+ abort ();
+ case bfd_reloc_ok:
+ break;
+ case bfd_reloc_overflow:
+ {
+ const char *name;
+ char buf[SYMNMLEN + 1];
+ char howto_name[10];
+
+ if (symndx == -1)
+ name = "*ABS*";
+ else if (h != NULL)
+ name = h->root.root.string;
+ else
+ {
+ name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
+ if (name == NULL)
+ return false;
+ }
+ sprintf (howto_name, "0x%02x", rel->r_type);
+
+ if (! ((*info->callbacks->reloc_overflow)
+ (info, name, howto_name, (bfd_vma) 0, input_bfd,
+ input_section, rel->r_vaddr - input_section->vma)))
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
projects / external / binutils.git / commitdiff