New .section Flag

[Tracy Kuhrt <Tracy dot Kuhrt at microchip dot com>]

I would like to add an additional flag to the .section directive for
COFF that would allow the user to specify that they want this section to
be blocked.  Following is a patch for this change.

@@ -1410,6 +1410,7 @@ coff_frob_file_after_relocs ()
  *                                               'x' for text
  *                                               'r' for read-only data

  *                                               's' for shared data
(PE)
+ *                                               'k' for blocked
  * But if the argument is not a quoted string, treat it as a
  * subsegment number.
  */
@@ -1468,6 +1469,9 @@ obj_coff_section (ignore)
                case 'x': flags |= SEC_CODE | SEC_LOAD; break;
                case 'r': flags |= SEC_READONLY; break;
                case 's': flags |= SEC_SHARED; break;
+#ifdef STYP_BLOCK
+                case 'k': flags |= SEC_BLOCK; break;
+#endif

                case 'i': /* STYP_INFO */
                case 'l': /* STYP_LIB */

It appears that the TI c54x port is the only port that currently uses
section blocking.

I am also interested in fixing the following from
ldlang.c::lang_add_section to obtain this value from bfd.
          /* FIXME: This value should really be obtained from the
bfd...  */
          output->block_value = 128;

Does this value already exist somewhere or would it need to be added?  I
could not see where this existed and thought it should be added to the
bfd_arch_info_type structure.  Any thoughts?

Tracy