From 7ee314faa48ba637641861e0288736cb4666f940 Mon Sep 17 00:00:00 2001
From: Alan Modra <amodra@gmail.com>
Date: Wed, 23 Sep 2009 13:54:29 +0000
Subject: bfd/ 	* bfd-in.h (bfd_elf_size_dynamic_sections): Add audit and
 depaudit 	arguments. 	* elflink.c (bfd_elf_size_dynamic_sections):
 Generate DT_AUDIT, 	DT_DEPAUDIT from audit/depaudit arguments. 
 (elf_finalize_dynstr): Finalize DT_AUDIT and DT_DEPAUDIT strtab entries. 
 (elf_link_add_object_symbols): Set dt_audit target data when finding a 
 DT_AUDIT. 	* bfd-in2.h: Regenerate. 	* bfd-elf.h: Add dt_audit to
 elf_obj_tdata, and elf_dt_audit macro. ld/ 	* emultempl/elf32.em
 (gld${EMULATION_NAME}_add_options): Add --audit, 	--depaudit, and -P
 options. 	(gld${EULATION_NAME}_handle_options): Ditto. 
 (gld${EULATION_NAME}_list_options): Ditto. 
 (gld${EMULATION_NAME}_append_to_separated_string): New function for 
 handling rpath-like colon separated strings. 
 (gld${EMULATION_NAME}_before_allocation): Pass the audit and depaudit 	libs
 to bfd.  Propagate DT_AUDIT from needed libs to depaudit. 	* ld.texinfo:
 Document new options. ld/testsuite/ 	* ld-elf/audit.exp: New. 	*
 ld-elf/audit.rd: New. 	* ld-elf/depaudit.rd: New. 	* ld-elf/depaudit2.rd:
 New.

---
 ld/emultempl/elf32.em | 93 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 91 insertions(+), 2 deletions(-)

(limited to 'ld/emultempl')

diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
index 9518714..f7b70ac 100644
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@@ -157,6 +157,10 @@ static lang_input_statement_type *global_found;
 static struct bfd_link_needed_list *global_vercheck_needed;
 static bfd_boolean global_vercheck_failed;
 
+/* These variables are used to implement target options */
+
+static char *audit; /* colon (typically) separated list of libs */
+static char *depaudit; /* colon (typically) separated list of libs */
 
 /* On Linux, it's possible to have different versions of the same
    shared library linked against different versions of libc.  The
@@ -1396,6 +1400,46 @@ if test x"$LDEMUL_BEFORE_ALLOCATION" != xgld"$EMULATION_NAME"_before_allocation;
   fi
 fragment <<EOF
 
+/* used by before_allocation and handle_option. */
+static void 
+gld${EMULATION_NAME}_append_to_separated_string (char **to, char *optarg)
+{
+  if (*to == NULL)
+    *to = xstrdup (optarg);
+  else
+    {
+      size_t to_len = strlen (*to);
+      size_t optarg_len = strlen (optarg);
+      char *buf;
+      char *cp = *to;
+
+      /* First see whether OPTARG is already in the path.  */
+      do
+	{
+	  if (strncmp (optarg, cp, optarg_len) == 0
+	      && (cp[optarg_len] == 0
+		  || cp[optarg_len] == config.rpath_separator))
+	    /* We found it.  */
+	    break;
+
+	  /* Not yet found.  */
+	  cp = strchr (cp, config.rpath_separator);
+	  if (cp != NULL)
+	    ++cp;
+	}
+      while (cp != NULL);
+
+      if (cp == NULL)
+	{
+	  buf = xmalloc (to_len + optarg_len + 2);
+	  sprintf (buf, "%s%c%s", *to,
+		   config.rpath_separator, optarg);
+	  free (*to);
+	  *to = buf;
+	}
+    }
+}
+
 /* This is called after the sections have been attached to output
    sections, but before any sizes or addresses have been set.  */
 
@@ -1404,6 +1448,7 @@ gld${EMULATION_NAME}_before_allocation (void)
 {
   const char *rpath;
   asection *sinterp;
+  bfd *abfd;
 
   if (link_info.hash->type == bfd_link_elf_hash_table)
     _bfd_elf_tls_setup (link_info.output_bfd, &link_info);
@@ -1418,9 +1463,39 @@ gld${EMULATION_NAME}_before_allocation (void)
   rpath = command_line.rpath;
   if (rpath == NULL)
     rpath = (const char *) getenv ("LD_RUN_PATH");
+
+  for (abfd = link_info.input_bfds; abfd; abfd = abfd->link_next)
+    {
+      const char *audit_libs = elf_dt_audit (abfd);
+
+      /* If the input bfd contains an audit entry, we need to add it as 
+         a dep audit entry.  */
+      if (audit_libs && *audit_libs != '\0')
+	{
+	  char *cp = xstrdup (audit_libs);
+	  do
+	    {
+	      int more = 0;
+	      char *cp2 = strchr (cp, config.rpath_separator);
+
+	      if (cp2)
+		{
+	          *cp2 = '\0';
+		  more = 1;
+		}
+	      
+	      if (cp != NULL && *cp != '\0')
+	        gld${EMULATION_NAME}_append_to_separated_string (&depaudit, cp);
+
+	      cp = more ? ++cp2 : NULL;
+	    }
+	  while (cp != NULL);
+	}
+    }
+
   if (! (bfd_elf_size_dynamic_sections
 	 (link_info.output_bfd, command_line.soname, rpath,
-	  command_line.filter_shlib,
+	  command_line.filter_shlib, audit, depaudit,
 	  (const char * const *) command_line.auxiliary_filters,
 	  &link_info, &sinterp, lang_elf_version_info)))
     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
@@ -2007,15 +2082,18 @@ fragment <<EOF
 #define OPTION_EXCLUDE_LIBS		(OPTION_EH_FRAME_HDR + 1)
 #define OPTION_HASH_STYLE		(OPTION_EXCLUDE_LIBS + 1)
 #define OPTION_BUILD_ID			(OPTION_HASH_STYLE + 1)
+#define OPTION_AUDIT			(OPTION_BUILD_ID + 1)
 
 static void
 gld${EMULATION_NAME}_add_options
   (int ns, char **shortopts, int nl, struct option **longopts,
    int nrl ATTRIBUTE_UNUSED, struct option **really_longopts ATTRIBUTE_UNUSED)
 {
-  static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:";
+  static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:P:";
   static const struct option xtra_long[] = {
     {"build-id", optional_argument, NULL, OPTION_BUILD_ID},
+    {"audit", required_argument, NULL, OPTION_AUDIT},
+    {"depaudit", required_argument, NULL, 'P'},
 EOF
 
 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
@@ -2067,6 +2145,12 @@ gld${EMULATION_NAME}_handle_option (int optc)
       if (strcmp (optarg, "none"))
 	link_info.emit_note_gnu_build_id = xstrdup (optarg);
       break;
+    case OPTION_AUDIT:
+  	gld${EMULATION_NAME}_append_to_separated_string (&audit, optarg); 
+	break;
+    case 'P':
+	gld${EMULATION_NAME}_append_to_separated_string (&depaudit, optarg);
+	break;
 
 EOF
 
@@ -2218,6 +2302,11 @@ gld${EMULATION_NAME}_list_options (FILE * file)
 {
   fprintf (file, _("\
   --build-id[=STYLE]          Generate build ID note\n"));
+  fprintf (file, _("\
+  --audit=AUDITLIB            Specify a library to use for auditing\n"));
+  fprintf (file, _("\
+  -P AUDITLIB, --depaudit=AUDITLIB\n" "\
+                              Specify a library to use for auditing dependencies\n"));
 EOF
 
 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
-- 
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