Add new command line switch --thumb-entry.

1 files changed, 54 insertions, 1 deletions

diff --git a/ld/emultempl/armelf.em b/ld/emultempl/armelf.em
index ee6aa76..6e3cfa6 100644
--- a/ld/emultempl/armelf.em
+++ b/ld/emultempl/armelf.em
@@ -65,13 +65,18 @@ static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
 static int  gld${EMULATION_NAME}_parse_args PARAMS((int, char **));
 static void gld${EMULATION_NAME}_list_options PARAMS ((FILE *));
+static void gld_${EMULATION_NAME}_finish PARAMS ((void));
 
 
 static int no_pipeline_knowledge = 0;
+static char * thumb_entry_symbol = NULL;
+
+#define OPTION_THUMB_ENTRY		301
 
 static struct option longopts[] =
 {
   { "no-pipeline-knowledge", no_argument, NULL, 'p'},
+  { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
   { NULL, no_argument, NULL, 0 }
 };
 
@@ -80,6 +85,7 @@ gld${EMULATION_NAME}_list_options (file)
      FILE * file;
 {
   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
+  fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 }
 
 static int
@@ -114,6 +120,10 @@ gld${EMULATION_NAME}_parse_args (argc, argv)
     case 'p':
       no_pipeline_knowledge = 1;
       break;
+
+    case OPTION_THUMB_ENTRY:
+      thumb_entry_symbol = optarg;
+      break;
     }
   
   return 1;
@@ -1136,6 +1146,49 @@ gld${EMULATION_NAME}_before_allocation ()
   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 }
 
+static void
+gld${EMULATION_NAME}_finish PARAMS((void))
+{
+  struct bfd_link_hash_entry * h;
+
+  if (thumb_entry_symbol == NULL)
+    return;
+  
+  h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol, false, false, true);
+
+  if (h != (struct bfd_link_hash_entry *) NULL
+      && (h->type == bfd_link_hash_defined
+	  || h->type == bfd_link_hash_defweak)
+      && h->u.def.section->output_section != NULL)
+    {
+      static char buffer[32];
+      bfd_vma val;
+      
+      /* Special procesing is required for a Thumb entry symbol.  The
+	 bottom bit of its address must be set.  */
+      val = (h->u.def.value
+	     + bfd_get_section_vma (output_bfd,
+				    h->u.def.section->output_section)
+	     + h->u.def.section->output_offset);
+      
+      val |= 1;
+
+      /* Now convert this value into a string and store it in entry_symbol
+         where the lang_finish() function will pick it up.  */
+      buffer[0] = '0';
+      buffer[1] = 'x';
+      
+      sprintf_vma (buffer + 2, val);
+
+      if (entry_symbol != NULL && entry_from_cmdline)
+	einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
+	       thumb_entry_symbol, entry_symbol);
+      entry_symbol = buffer;
+    }
+  else
+    einfo (_("%P: warning: connot find thumb start symbol %s\n"), thumb_entry_symbol);
+}
+
 static char *
 gld${EMULATION_NAME}_get_script (isfile)
      int *isfile;
@@ -1204,7 +1257,7 @@ struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
   gld${EMULATION_NAME}_get_script,
   "${EMULATION_NAME}",
   "${OUTPUT_FORMAT}",
-  NULL, /* finish */
+  gld${EMULATION_NAME}_finish, /* finish */
   NULL, /* create output section statements */
   gld${EMULATION_NAME}_open_dynamic_archive,
   gld${EMULATION_NAME}_place_orphan,