* ld.h (check_nocrossrefs): Declare.
* ldlang.h (struct lang_nocrossref): Define. (struct lang_nocrossrefs): Define. (nocrossref_list): Declare. (lang_add_nocrossref): Declare. * ldlex.l: Recognize NOCROSSREFS keyword. * ldgram.y (%union): Add nocrossref field. (NOCROSSREFS): New terminal. (ifile_p1): Recognize NOCROSSREFS. (nocrossref_list): New nonterminal. * ldlang.c (nocrossref_list): Define. (lang_add_nocrossref): New function. * ldmain.c (main): If nocrossref_list is not NULL, call check_nocrossrefs. (warning_callback): Free symbols if there is no place to store them. (notice): Call add_cref if nocrossref_list is not NULL. * ldcref.c: Include "ldexp.h" and "ldlang.h". (check_nocrossrefs): New function. (check_nocrossref): New static function. (struct check_refs_info): Define. (check_refs, check_reloc_refs): New static functions. * Makefile.in: Rebuild dependencies. * ld.texinfo (Option Commands): Document NOCROSSREFS.
This commit is contained in:
Ian Lance Taylor
parent
8efb80797c
commit
582dd77f65
9 changed files with 359 additions and 10 deletions
29
ld/ChangeLog
29
ld/ChangeLog
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@ -1,5 +1,34 @@
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Thu Aug 1 12:52:19 1996 Ian Lance Taylor <ian@cygnus.com>
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* ld.h (check_nocrossrefs): Declare.
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* ldlang.h (struct lang_nocrossref): Define.
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(struct lang_nocrossrefs): Define.
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(nocrossref_list): Declare.
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(lang_add_nocrossref): Declare.
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* ldlex.l: Recognize NOCROSSREFS keyword.
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* ldgram.y (%union): Add nocrossref field.
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(NOCROSSREFS): New terminal.
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(ifile_p1): Recognize NOCROSSREFS.
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(nocrossref_list): New nonterminal.
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* ldlang.c (nocrossref_list): Define.
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(lang_add_nocrossref): New function.
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* ldmain.c (main): If nocrossref_list is not NULL, call
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check_nocrossrefs.
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(warning_callback): Free symbols if there is no place to store
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them.
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(notice): Call add_cref if nocrossref_list is not NULL.
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* ldcref.c: Include "ldexp.h" and "ldlang.h".
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(check_nocrossrefs): New function.
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(check_nocrossref): New static function.
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(struct check_refs_info): Define.
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(check_refs, check_reloc_refs): New static functions.
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* Makefile.in: Rebuild dependencies.
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* ld.texinfo (Option Commands): Document NOCROSSREFS.
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* ld.texinfo (Section Placement): Improve the wording of the
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wildcard documentation. Mention that wildcards are only searched
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for on the command line, not in the file system.
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* emultempl/sunos.em (gld${EMULATION_NAME}_after_open): Move
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definition of lib_path inside condition where it is used.
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2
ld/NEWS
2
ld/NEWS
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@ -5,6 +5,8 @@ Changes since version 2.7:
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* Linker scripts may now contain shell wildcard characters for file and section
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names.
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* The NOCROSSREFS command was added to the linker script language.
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Changes since version 2.6:
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* New option --cref to print out a cross reference table.
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@ -2704,6 +2704,24 @@ the environment variable @code{GNUTARGET}, if available, to select the
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output file format. If that variable is also absent, @code{ld} uses
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the default format configured for your machine in the BFD libraries.
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@end ifclear
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@cindex cross references
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@kindex NOCROSSREFS ( @var{sections} )
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@item NOCROSSREFS ( @var{section} @var{section} @dots{} )
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This command may be used to tell @code{ld} to issue an error about any
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references among certain sections.
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In certain types of programs, particularly on embedded systems, when one
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section is loaded into memory, another section will not be. Any direct
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references between the two sections would be errors. For example, it
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would be an error if code in one section called a function defined in
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the other section.
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The @code{NOCROSSREFS} command takes a list of section names. If
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@code{ld} detects any cross references between the sections, it reports
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an error and returns a non-zero exit status. The @code{NOCROSSREFS}
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command uses output section names, defined in the @code{SECTIONS}
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command. It does not use the names of input sections.
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@end table
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@ifset GENERIC
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220
ld/ldcref.c
220
ld/ldcref.c
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@ -18,7 +18,9 @@ You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This file holds routines that manage the cross reference table. */
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/* This file holds routines that manage the cross reference table.
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The table is used to generate cross reference reports. It is also
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used to implement the NOCROSSREFS command in the linker script. */
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#include "bfd.h"
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#include "sysdep.h"
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@ -28,6 +30,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "ld.h"
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#include "ldmain.h"
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#include "ldmisc.h"
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#include "ldexp.h"
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#include "ldlang.h"
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/* We keep an instance of this structure for each reference to a
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symbol from a given object. */
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@ -71,6 +75,11 @@ static struct bfd_hash_entry *cref_hash_newfunc
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static boolean cref_fill_array PARAMS ((struct cref_hash_entry *, PTR));
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static int cref_sort_array PARAMS ((const PTR, const PTR));
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static void output_one_cref PARAMS ((FILE *, struct cref_hash_entry *));
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static boolean check_nocrossref PARAMS ((struct cref_hash_entry *, PTR));
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static void check_refs
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PARAMS ((struct cref_hash_entry *, struct bfd_link_hash_entry *,
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struct lang_nocrossrefs *));
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static void check_reloc_refs PARAMS ((bfd *, asection *, PTR));
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/* Look up an entry in the cref hash table. */
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@ -325,3 +334,212 @@ output_one_cref (fp, h)
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ASSERT (len == 0);
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}
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/* Check for prohibited cross references. */
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void
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check_nocrossrefs ()
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{
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if (! cref_initialized)
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return;
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cref_hash_traverse (&cref_table, check_nocrossref, (PTR) NULL);
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}
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/* Check one symbol to see if it is a prohibited cross reference. */
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/*ARGSUSED*/
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static boolean
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check_nocrossref (h, ignore)
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struct cref_hash_entry *h;
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PTR ignore;
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{
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struct bfd_link_hash_entry *hl;
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asection *defsec;
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const char *defsecname;
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struct lang_nocrossrefs *ncrs;
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struct lang_nocrossref *ncr;
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hl = bfd_link_hash_lookup (link_info.hash, h->root.string, false,
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false, true);
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if (hl == NULL)
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{
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einfo ("%P: symbol `%T' missing from main hash table\n",
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h->root.string);
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return true;
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}
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if (hl->type != bfd_link_hash_defined
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&& hl->type != bfd_link_hash_defweak)
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return true;
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defsec = hl->u.def.section->output_section;
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defsecname = bfd_get_section_name (defsec->owner, defsec);
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for (ncrs = nocrossref_list; ncrs != NULL; ncrs = ncrs->next)
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for (ncr = ncrs->list; ncr != NULL; ncr = ncr->next)
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if (strcmp (ncr->name, defsecname) == 0)
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check_refs (h, hl, ncrs);
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return true;
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}
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/* The struct is used to pass information from check_refs to
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check_reloc_refs through bfd_map_over_sections. */
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struct check_refs_info
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{
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struct cref_hash_entry *h;
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asection *defsec;
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struct lang_nocrossrefs *ncrs;
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asymbol **asymbols;
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boolean same;
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};
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/* This function is called for each symbol defined in a section which
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prohibits cross references. We need to look through all references
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to this symbol, and ensure that the references are not from
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prohibited sections. */
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static void
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check_refs (h, hl, ncrs)
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struct cref_hash_entry *h;
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struct bfd_link_hash_entry *hl;
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struct lang_nocrossrefs *ncrs;
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{
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struct cref_ref *ref;
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for (ref = h->refs; ref != NULL; ref = ref->next)
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{
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lang_input_statement_type *li;
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asymbol **asymbols;
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struct check_refs_info info;
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/* We need to look through the relocations for this BFD, to see
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if any of the relocations which refer to this symbol are from
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a prohibited section. Note that we need to do this even for
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the BFD in which the symbol is defined, since even a single
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BFD might contain a prohibited cross reference; for this
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case, we set the SAME field in INFO, which will cause
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CHECK_RELOCS_REFS to check for relocations against the
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section as well as against the symbol. */
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li = (lang_input_statement_type *) ref->abfd->usrdata;
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if (li != NULL && li->asymbols != NULL)
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asymbols = li->asymbols;
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else
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{
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long symsize;
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long symbol_count;
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symsize = bfd_get_symtab_upper_bound (ref->abfd);
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if (symsize < 0)
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einfo ("%B%F: could not read symbols; %E\n", ref->abfd);
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asymbols = (asymbol **) xmalloc (symsize);
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symbol_count = bfd_canonicalize_symtab (ref->abfd, asymbols);
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if (symbol_count < 0)
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einfo ("%B%F: could not read symbols: %E\n", ref->abfd);
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if (li != NULL)
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{
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li->asymbols = asymbols;
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li->symbol_count = symbol_count;
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}
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}
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info.h = h;
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info.defsec = hl->u.def.section;
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info.ncrs = ncrs;
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info.asymbols = asymbols;
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if (ref->abfd == hl->u.def.section->owner)
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info.same = true;
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else
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info.same = false;
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bfd_map_over_sections (ref->abfd, check_reloc_refs, (PTR) &info);
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if (li == NULL)
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free (asymbols);
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}
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}
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/* This is called via bfd_map_over_sections. INFO->H is a symbol
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defined in INFO->DEFSECNAME. If this section maps into any of the
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sections listed in INFO->NCRS, other than INFO->DEFSECNAME, then we
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look through the relocations. If any of the relocations are to
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INFO->H, then we report a prohibited cross reference error. */
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static void
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check_reloc_refs (abfd, sec, iarg)
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bfd *abfd;
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asection *sec;
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PTR iarg;
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{
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struct check_refs_info *info = (struct check_refs_info *) iarg;
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asection *outsec;
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const char *outsecname;
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asection *outdefsec;
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const char *outdefsecname;
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struct lang_nocrossref *ncr;
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const char *symname;
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long relsize;
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arelent **relpp;
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long relcount;
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arelent **p, **pend;
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outsec = sec->output_section;
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outsecname = bfd_get_section_name (outsec->owner, outsec);
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outdefsec = info->defsec->output_section;
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outdefsecname = bfd_get_section_name (outdefsec->owner, outdefsec);
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/* The section where the symbol is defined is permitted. */
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if (strcmp (outsecname, outdefsecname) == 0)
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return;
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for (ncr = info->ncrs->list; ncr != NULL; ncr = ncr->next)
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if (strcmp (outsecname, ncr->name) == 0)
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break;
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if (ncr == NULL)
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return;
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/* This section is one for which cross references are prohibited.
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Look through the relocations, and see if any of them are to
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INFO->H. */
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symname = info->h->root.string;
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relsize = bfd_get_reloc_upper_bound (abfd, sec);
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if (relsize < 0)
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einfo ("%B%F: could not read relocs: %E\n", abfd);
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if (relsize == 0)
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return;
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relpp = (arelent **) xmalloc (relsize);
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relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
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if (relcount < 0)
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einfo ("%B%F: could not read relocs: %E\n", abfd);
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p = relpp;
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pend = p + relcount;
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for (; p < pend && *p != NULL; p++)
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{
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arelent *q = *p;
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if (q->sym_ptr_ptr != NULL
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&& *q->sym_ptr_ptr != NULL
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&& (strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), symname) == 0
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|| (info->same
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&& *q->sym_ptr_ptr == info->defsec->symbol)))
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{
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/* We found a reloc for the symbol. The symbol is defined
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in OUTSECNAME. This reloc is from a section which is
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mapped into a section from which references to OUTSECNAME
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are prohibited. We must report an error. */
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einfo ("%X%C: prohibited cross reference from %s to `%T' in %s\n",
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abfd, sec, q->address, outsecname,
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bfd_asymbol_name (*q->sym_ptr_ptr), outdefsecname);
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}
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}
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free (relpp);
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}
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|
|
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34
ld/ldgram.y
34
ld/ldgram.y
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|
@ -75,6 +75,7 @@ static int error_index;
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union etree_union *at;
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union etree_union *flags;
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} phdr;
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struct lang_nocrossref *nocrossref;
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}
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|
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%type <etree> exp opt_exp_with_type mustbe_exp opt_at phdr_type phdr_val
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|
@ -82,8 +83,9 @@ static int error_index;
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%type <name> memspec_opt casesymlist
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%token <integer> INT
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%token <name> NAME LNAME
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%type <integer> length
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%type <integer> length
|
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%type <phdr> phdr_qualifiers
|
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%type <nocrossref> nocrossref_list
|
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|
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%right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ '=' LSHIFTEQ RSHIFTEQ ANDEQ OREQ
|
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%right <token> '?' ':'
|
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|
|
@ -112,7 +114,7 @@ static int error_index;
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%token NOLOAD DSECT COPY INFO OVERLAY
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%token NAME LNAME DEFINED TARGET_K SEARCH_DIR MAP ENTRY
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%token <integer> SIZEOF NEXT ADDR
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%token STARTUP HLL SYSLIB FLOAT NOFLOAT
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%token STARTUP HLL SYSLIB FLOAT NOFLOAT NOCROSSREFS
|
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%token ORIGIN FILL
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%token LENGTH CREATE_OBJECT_SYMBOLS INPUT GROUP OUTPUT CONSTRUCTORS
|
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%token ALIGNMOD AT PROVIDE
|
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|
|
@ -299,6 +301,10 @@ ifile_p1:
|
|||
{ lang_add_map($3); }
|
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| INCLUDE filename
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{ ldfile_open_command_file($2); } ifile_list END
|
||||
| NOCROSSREFS '(' nocrossref_list ')'
|
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{
|
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lang_add_nocrossref ($3);
|
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}
|
||||
;
|
||||
|
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input_list:
|
||||
|
|
@ -569,6 +575,30 @@ floating_point_support:
|
|||
{ lang_float(false); }
|
||||
;
|
||||
|
||||
nocrossref_list:
|
||||
/* empty */
|
||||
{
|
||||
$$ = NULL;
|
||||
}
|
||||
| NAME nocrossref_list
|
||||
{
|
||||
struct lang_nocrossref *n;
|
||||
|
||||
n = (struct lang_nocrossref *) xmalloc (sizeof *n);
|
||||
n->name = $1;
|
||||
n->next = $2;
|
||||
$$ = n;
|
||||
}
|
||||
| NAME ',' nocrossref_list
|
||||
{
|
||||
struct lang_nocrossref *n;
|
||||
|
||||
n = (struct lang_nocrossref *) xmalloc (sizeof *n);
|
||||
n->name = $1;
|
||||
n->next = $3;
|
||||
$$ = n;
|
||||
}
|
||||
;
|
||||
|
||||
mustbe_exp: { ldlex_expression(); }
|
||||
exp
|
||||
|
|
|
|||
18
ld/ldlang.c
18
ld/ldlang.c
|
|
@ -142,6 +142,7 @@ boolean lang_has_input_file = false;
|
|||
boolean had_output_filename = false;
|
||||
boolean lang_float_flag = false;
|
||||
boolean delete_output_file_on_failure = false;
|
||||
struct lang_nocrossrefs *nocrossref_list;
|
||||
|
||||
etree_type *base; /* Relocation base - or null */
|
||||
|
||||
|
|
@ -3617,3 +3618,20 @@ lang_record_phdrs ()
|
|||
u->output_section_statement.name, pl->name);
|
||||
}
|
||||
}
|
||||
|
||||
/* Record a list of sections which may not be cross referenced. */
|
||||
|
||||
void
|
||||
lang_add_nocrossref (l)
|
||||
struct lang_nocrossref *l;
|
||||
{
|
||||
struct lang_nocrossrefs *n;
|
||||
|
||||
n = (struct lang_nocrossrefs *) xmalloc (sizeof *n);
|
||||
n->next = nocrossref_list;
|
||||
n->list = l;
|
||||
nocrossref_list = n;
|
||||
|
||||
/* Set notice_all so that we get informed about all symbols. */
|
||||
link_info.notice_all = true;
|
||||
}
|
||||
|
|
|
|||
40
ld/ldlang.h
40
ld/ldlang.h
|
|
@ -1,5 +1,5 @@
|
|||
/* ldlang.h - linker command language support
|
||||
Copyright 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
|
||||
Copyright 1991, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
|
||||
|
||||
This file is part of GLD, the Gnu Linker.
|
||||
|
||||
|
|
@ -96,6 +96,17 @@ typedef struct lang_output_statement_struct
|
|||
const char *name;
|
||||
} lang_output_statement_type;
|
||||
|
||||
/* Section types specified in a linker script. */
|
||||
|
||||
enum section_type
|
||||
{
|
||||
normal_section,
|
||||
dsect_section,
|
||||
copy_section,
|
||||
noload_section,
|
||||
info_section,
|
||||
overlay_section
|
||||
};
|
||||
|
||||
/* This structure holds a list of program headers describing segments
|
||||
in which this section should be placed. */
|
||||
|
|
@ -120,7 +131,7 @@ typedef struct lang_output_section_statement_struct
|
|||
|
||||
asection *bfd_section;
|
||||
int flags; /* Or together of all input sections */
|
||||
int loadable; /* set from NOLOAD flag in script */
|
||||
enum section_type sectype;
|
||||
struct memory_region_struct *region;
|
||||
size_t block_value;
|
||||
fill_type fill;
|
||||
|
|
@ -243,9 +254,6 @@ typedef struct lang_input_statement_struct
|
|||
/* unsigned int globals_in_this_file;*/
|
||||
const char *target;
|
||||
boolean real;
|
||||
asection *common_section;
|
||||
asection *common_output_section;
|
||||
boolean complained;
|
||||
} lang_input_statement_type;
|
||||
|
||||
typedef struct
|
||||
|
|
@ -335,6 +343,25 @@ struct lang_phdr
|
|||
etree_type *flags;
|
||||
};
|
||||
|
||||
/* This structure is used to hold a list of sections which may not
|
||||
cross reference each other. */
|
||||
|
||||
struct lang_nocrossref
|
||||
{
|
||||
struct lang_nocrossref *next;
|
||||
const char *name;
|
||||
};
|
||||
|
||||
/* The list of nocrossref lists. */
|
||||
|
||||
struct lang_nocrossrefs
|
||||
{
|
||||
struct lang_nocrossrefs *next;
|
||||
struct lang_nocrossref *list;
|
||||
};
|
||||
|
||||
extern struct lang_nocrossrefs *nocrossref_list;
|
||||
|
||||
extern lang_output_section_statement_type *abs_output_section;
|
||||
extern boolean lang_has_input_file;
|
||||
extern etree_type *base;
|
||||
|
|
@ -353,7 +380,7 @@ extern void lang_add_output PARAMS ((const char *, int from_script));
|
|||
extern void lang_enter_output_section_statement
|
||||
PARAMS ((const char *output_section_statement_name,
|
||||
etree_type * address_exp,
|
||||
int flags,
|
||||
enum section_type sectype,
|
||||
bfd_vma block_value,
|
||||
etree_type *align,
|
||||
etree_type *subalign,
|
||||
|
|
@ -431,5 +458,6 @@ extern void lang_new_phdr
|
|||
PARAMS ((const char *, etree_type *, boolean, boolean, etree_type *,
|
||||
etree_type *));
|
||||
extern void lang_section_in_phdr PARAMS ((const char *));
|
||||
extern void lang_add_nocrossref PARAMS ((struct lang_nocrossref *));
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -256,6 +256,7 @@ NOCFILENAMECHAR [_a-zA-Z0-9\/\.\-\_\+\$\:\[\]\\\~]
|
|||
<BOTH,SCRIPT>"SHORT" { RTOKEN( SHORT);}
|
||||
<BOTH,SCRIPT>"BYTE" { RTOKEN( BYTE);}
|
||||
<BOTH,SCRIPT>"NOFLOAT" { RTOKEN(NOFLOAT);}
|
||||
<BOTH,SCRIPT>"NOCROSSREFS" { RTOKEN(NOCROSSREFS);}
|
||||
<EXPRESSION,BOTH,SCRIPT>"NOLOAD" { RTOKEN(NOLOAD);}
|
||||
<EXPRESSION,BOTH,SCRIPT>"DSECT" { RTOKEN(DSECT);}
|
||||
<EXPRESSION,BOTH,SCRIPT>"COPY" { RTOKEN(COPY);}
|
||||
|
|
|
|||
|
|
@ -323,6 +323,8 @@ main (argc, argv)
|
|||
lang_map ();
|
||||
if (command_line.cref)
|
||||
output_cref (config.map_file != NULL ? config.map_file : stdout);
|
||||
if (nocrossref_list != NULL)
|
||||
check_nocrossrefs ();
|
||||
|
||||
/* Even if we're producing relocateable output, some non-fatal errors should
|
||||
be reported in the exit status. (What non-fatal errors, if any, do we
|
||||
|
|
@ -1031,6 +1033,9 @@ warning_callback (info, warning, symbol, abfd, section, address)
|
|||
|
||||
if (! info.found)
|
||||
einfo ("%B: %s\n", abfd, warning);
|
||||
|
||||
if (entry == NULL)
|
||||
free (asymbols);
|
||||
}
|
||||
|
||||
return true;
|
||||
|
|
@ -1241,7 +1246,7 @@ notice (info, name, abfd, section, value)
|
|||
bfd_is_und_section (section) ? "reference to" : "definition of",
|
||||
name);
|
||||
|
||||
if (command_line.cref)
|
||||
if (command_line.cref || nocrossref_list != NULL)
|
||||
add_cref (name, abfd, section, value);
|
||||
|
||||
return true;
|
||||
|
|
|
|||
Loading…
Reference in a new issue