Enable Dwarf2 debugging info support for mn10300

[Alexandre Oliva <aoliva at cygnus dot com>]

I'm checking this in, approved by Jeff Law.  Ok for the release branch
too?  It would probably be a good idea, given that, in a couple of
minutes, the GCC CVS tree won't build with --target=mn10300-elf
without this patch.

Index: gas/ChangeLog
from  Alexandre Oliva  <aoliva@cygnus.com>

	* config/tc-mn10300.h (md_end): Define.
	(mn10300_finalize): Declare.
	* config/tc-mn10300.c: Include dwarf2dbg.h.
	(debug_line): Define.
	(md_assemble): Generate dwarf2 line info.
	(mn10300_finalize): New function.  Finalize dwarf2 info.

Index: gas/config/tc-mn10300.h
===================================================================
RCS file: /cvs/src/src/gas/config/tc-mn10300.h,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 tc-mn10300.h
--- gas/config/tc-mn10300.h	1999/05/03 07:28:43	1.1.1.1
+++ gas/config/tc-mn10300.h	2000/05/12 06:07:14
@@ -1,5 +1,5 @@
 /* tc-mn10300.h -- Header file for tc-mn10300.c.
-   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
 
    This file is part of GAS, the GNU Assembler.
 
@@ -48,3 +48,6 @@
 /* We do relaxing in the assembler as well as the linker.  */
 extern const struct relax_type md_relax_table[];
 #define TC_GENERIC_RELAX_TABLE md_relax_table
+
+#define md_end() mn10300_finalize ()
+void mn10300_finalize PARAMS ((void));
Index: gas/config/tc-mn10300.c
===================================================================
RCS file: /cvs/src/src/gas/config/tc-mn10300.c,v
retrieving revision 1.5
diff -u -r1.5 tc-mn10300.c
--- gas/config/tc-mn10300.c	2000/04/20 22:18:27	1.5
+++ gas/config/tc-mn10300.c	2000/05/12 06:07:14
@@ -23,6 +23,7 @@
 #include "as.h"
 #include "subsegs.h"     
 #include "opcode/mn10300.h"
+#include "dwarf2dbg.h"
 
 /* Structure to hold information about predefined registers.  */
 struct reg_name
@@ -31,6 +32,8 @@
   int value;
 };
 
+struct dwarf2_line_info debug_line;
+
 /* Generic assembler global variables which must be defined by all targets. */
 
 /* Characters which always start a comment. */
@@ -118,6 +121,8 @@
 /* The target specific pseudo-ops which we support.  */
 const pseudo_typeS md_pseudo_table[] =
 {
+  { "file", dwarf2_directive_file },
+  { "loc", dwarf2_directive_loc },
   { "am30",	set_arch_mach,		AM30 },
   { "am33",	set_arch_mach,		AM33 },
   { "mn10300",	set_arch_mach,		MN103 },
@@ -1745,6 +1750,21 @@
 	    }
 	}
     }
+
+  if (debug_type == DEBUG_DWARF2)
+    {
+      bfd_vma addr;
+
+      /* First update the notion of the current source line.  */
+      dwarf2_where (&debug_line);
+
+      /* We want the offset of the start of this instruction within the
+         the current frag.  */
+      addr = frag_now->fr_address + frag_now_fix () - size;
+
+      /* And record the information.  */
+      dwarf2_gen_line_info (addr, &debug_line);
+    }
 }
 
 
@@ -1998,4 +2018,11 @@
     as_warn (_("could not set architecture and machine"));
 
   current_machine = mach;
+}
+
+void
+mn10300_finalize ()
+{
+  if (debug_type == DEBUG_DWARF2)
+    dwarf2_finish ();
 }

-- 
Alexandre Oliva    Enjoy Guaranį, see http://www.ic.unicamp.br/~oliva/
Cygnus Solutions, a Red Hat company        aoliva@{redhat, cygnus}.com
Free Software Developer and Evangelist    CS PhD student at IC-Unicamp
oliva@{lsd.ic.unicamp.br, gnu.org}   Write to mailing lists, not to me