along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-/* This file holds routines that manage the cross reference table. */
+/* This file holds routines that manage the cross reference table.
+ The table is used to generate cross reference reports. It is also
+ used to implement the NOCROSSREFS command in the linker script. */
#include "bfd.h"
#include "sysdep.h"
#include "ld.h"
#include "ldmain.h"
#include "ldmisc.h"
+#include "ldexp.h"
+#include "ldlang.h"
/* We keep an instance of this structure for each reference to a
symbol from a given object. */
static boolean cref_fill_array PARAMS ((struct cref_hash_entry *, PTR));
static int cref_sort_array PARAMS ((const PTR, const PTR));
static void output_one_cref PARAMS ((FILE *, struct cref_hash_entry *));
+static boolean check_nocrossref PARAMS ((struct cref_hash_entry *, PTR));
+static void check_refs
+ PARAMS ((struct cref_hash_entry *, struct bfd_link_hash_entry *,
+ struct lang_nocrossrefs *));
+static void check_reloc_refs PARAMS ((bfd *, asection *, PTR));
/* Look up an entry in the cref hash table. */
ASSERT (len == 0);
}
+
+/* Check for prohibited cross references. */
+
+void
+check_nocrossrefs ()
+{
+ if (! cref_initialized)
+ return;
+
+ cref_hash_traverse (&cref_table, check_nocrossref, (PTR) NULL);
+}
+
+/* Check one symbol to see if it is a prohibited cross reference. */
+
+/*ARGSUSED*/
+static boolean
+check_nocrossref (h, ignore)
+ struct cref_hash_entry *h;
+ PTR ignore;
+{
+ struct bfd_link_hash_entry *hl;
+ asection *defsec;
+ const char *defsecname;
+ struct lang_nocrossrefs *ncrs;
+ struct lang_nocrossref *ncr;
+
+ hl = bfd_link_hash_lookup (link_info.hash, h->root.string, false,
+ false, true);
+ if (hl == NULL)
+ {
+ einfo ("%P: symbol `%T' missing from main hash table\n",
+ h->root.string);
+ return true;
+ }
+
+ if (hl->type != bfd_link_hash_defined
+ && hl->type != bfd_link_hash_defweak)
+ return true;
+
+ defsec = hl->u.def.section->output_section;
+ if (defsec == NULL)
+ return true;
+ defsecname = bfd_get_section_name (defsec->owner, defsec);
+
+ for (ncrs = nocrossref_list; ncrs != NULL; ncrs = ncrs->next)
+ for (ncr = ncrs->list; ncr != NULL; ncr = ncr->next)
+ if (strcmp (ncr->name, defsecname) == 0)
+ check_refs (h, hl, ncrs);
+
+ return true;
+}
+
+/* The struct is used to pass information from check_refs to
+ check_reloc_refs through bfd_map_over_sections. */
+
+struct check_refs_info
+{
+ struct cref_hash_entry *h;
+ asection *defsec;
+ struct lang_nocrossrefs *ncrs;
+ asymbol **asymbols;
+ boolean same;
+};
+
+/* This function is called for each symbol defined in a section which
+ prohibits cross references. We need to look through all references
+ to this symbol, and ensure that the references are not from
+ prohibited sections. */
+
+static void
+check_refs (h, hl, ncrs)
+ struct cref_hash_entry *h;
+ struct bfd_link_hash_entry *hl;
+ struct lang_nocrossrefs *ncrs;
+{
+ struct cref_ref *ref;
+
+ for (ref = h->refs; ref != NULL; ref = ref->next)
+ {
+ lang_input_statement_type *li;
+ asymbol **asymbols;
+ struct check_refs_info info;
+
+ /* We need to look through the relocations for this BFD, to see
+ if any of the relocations which refer to this symbol are from
+ a prohibited section. Note that we need to do this even for
+ the BFD in which the symbol is defined, since even a single
+ BFD might contain a prohibited cross reference; for this
+ case, we set the SAME field in INFO, which will cause
+ CHECK_RELOCS_REFS to check for relocations against the
+ section as well as against the symbol. */
+
+ li = (lang_input_statement_type *) ref->abfd->usrdata;
+ if (li != NULL && li->asymbols != NULL)
+ asymbols = li->asymbols;
+ else
+ {
+ long symsize;
+ long symbol_count;
+
+ symsize = bfd_get_symtab_upper_bound (ref->abfd);
+ if (symsize < 0)
+ einfo ("%B%F: could not read symbols; %E\n", ref->abfd);
+ asymbols = (asymbol **) xmalloc (symsize);
+ symbol_count = bfd_canonicalize_symtab (ref->abfd, asymbols);
+ if (symbol_count < 0)
+ einfo ("%B%F: could not read symbols: %E\n", ref->abfd);
+ if (li != NULL)
+ {
+ li->asymbols = asymbols;
+ li->symbol_count = symbol_count;
+ }
+ }
+
+ info.h = h;
+ info.defsec = hl->u.def.section;
+ info.ncrs = ncrs;
+ info.asymbols = asymbols;
+ if (ref->abfd == hl->u.def.section->owner)
+ info.same = true;
+ else
+ info.same = false;
+ bfd_map_over_sections (ref->abfd, check_reloc_refs, (PTR) &info);
+
+ if (li == NULL)
+ free (asymbols);
+ }
+}
+
+/* This is called via bfd_map_over_sections. INFO->H is a symbol
+ defined in INFO->DEFSECNAME. If this section maps into any of the
+ sections listed in INFO->NCRS, other than INFO->DEFSECNAME, then we
+ look through the relocations. If any of the relocations are to
+ INFO->H, then we report a prohibited cross reference error. */
+
+static void
+check_reloc_refs (abfd, sec, iarg)
+ bfd *abfd;
+ asection *sec;
+ PTR iarg;
+{
+ struct check_refs_info *info = (struct check_refs_info *) iarg;
+ asection *outsec;
+ const char *outsecname;
+ asection *outdefsec;
+ const char *outdefsecname;
+ struct lang_nocrossref *ncr;
+ const char *symname;
+ long relsize;
+ arelent **relpp;
+ long relcount;
+ arelent **p, **pend;
+
+ outsec = sec->output_section;
+ outsecname = bfd_get_section_name (outsec->owner, outsec);
+
+ outdefsec = info->defsec->output_section;
+ outdefsecname = bfd_get_section_name (outdefsec->owner, outdefsec);
+
+ /* The section where the symbol is defined is permitted. */
+ if (strcmp (outsecname, outdefsecname) == 0)
+ return;
+
+ for (ncr = info->ncrs->list; ncr != NULL; ncr = ncr->next)
+ if (strcmp (outsecname, ncr->name) == 0)
+ break;
+
+ if (ncr == NULL)
+ return;
+
+ /* This section is one for which cross references are prohibited.
+ Look through the relocations, and see if any of them are to
+ INFO->H. */
+
+ symname = info->h->root.string;
+
+ relsize = bfd_get_reloc_upper_bound (abfd, sec);
+ if (relsize < 0)
+ einfo ("%B%F: could not read relocs: %E\n", abfd);
+ if (relsize == 0)
+ return;
+
+ relpp = (arelent **) xmalloc (relsize);
+ relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
+ if (relcount < 0)
+ einfo ("%B%F: could not read relocs: %E\n", abfd);
+
+ p = relpp;
+ pend = p + relcount;
+ for (; p < pend && *p != NULL; p++)
+ {
+ arelent *q = *p;
+
+ if (q->sym_ptr_ptr != NULL
+ && *q->sym_ptr_ptr != NULL
+ && (strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), symname) == 0
+ || (info->same
+ && *q->sym_ptr_ptr == info->defsec->symbol)))
+ {
+ /* We found a reloc for the symbol. The symbol is defined
+ in OUTSECNAME. This reloc is from a section which is
+ mapped into a section from which references to OUTSECNAME
+ are prohibited. We must report an error. */
+ einfo ("%X%C: prohibited cross reference from %s to `%T' in %s\n",
+ abfd, sec, q->address, outsecname,
+ bfd_asymbol_name (*q->sym_ptr_ptr), outdefsecname);
+ }
+ }
+
+ free (relpp);
+}
projects / deliverable / binutils-gdb.git / blobdiff