Re: [patch] Translation of mn10300 debugging symbols to gdb's internalregister numbering scheme

[Matt Hiller <hiller@redhat.com>]

On Tue, 27 Feb 2001, Michael Snyder wrote:
> 
> Matt, 
> 
> I think you have found the right approach, but not quite the right
> implementation.  The DWARF_REG_TO_REGNUM macro has been multi-arched.
> That means that instead of defining it as a macro, you should implement
> it as a function in mn10300-tdep.c, and then set the appropriate 
> gdbarch function vector to point to your function.
> 
> While you are at it, I would recommend you go ahead and use the
> same function for dwarf2_reg_to_regnum.  Might as well cover
> all bases.

	Okay. Another draft follows:

> Matt Hiller wrote:
> > 
> >         At http://gcc.gnu.org/ml/gcc-patches/2001-02/msg01491.html , Alex
> > Oliva describes an inconsistency in the register numbering for mn10300
> > between gcc and the other tools. Matushita has developed debugging tools
> > based on the numbering gcc uses, so we are obliged to alter the behavior
> > of gdb instead. The following patch has gdb translate debugging register
> > numbers to gdb REGNUMs.
> > 
> >         I do not have write access to this repository; my patch, if
> > acceptable, will have to be committed by someone else.

2001-02-27  Matt Hiller  <hiller@redhat.com>

	* mn10300-tdep.c (mn10300_stab_reg_to_regnum): New function.
	(mn10300_gdbarch_init): Set appropriate elements of gdbarch to
	mn10300_stab_reg_to_regnum.
 
Index: mn10300-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/mn10300-tdep.c,v
retrieving revision 1.6
diff -u -p -r1.6 mn10300-tdep.c
--- mn10300-tdep.c	2001/02/08 06:03:53	1.6
+++ mn10300-tdep.c	2001/02/28 00:01:35
@@ -939,6 +939,25 @@ mn10300_dump_tdep (struct gdbarch *curre
 		      tdep->am33_mode);
 }
 
+/* Convert a dbx stab register number to a gdb REGNUM.  Also fine for
+   dwarf and dwarf2.  */
+
+static int
+mn10300_stab_reg_to_regnum (int num)
+{
+  if (num <= 7)
+    return num;
+  else if (num == 8)
+    return -1;  /* ap, which won't appear in debugging info.  */
+  else if (num == 9)
+    return SP_REGNUM;
+  else if (10 <= num && num <= 17)
+    return (num - 10) + E0_REGNUM;
+  else
+    return -1;  /* program counter, etc., none of which appear in debugging
+		   info.  */
+}
+
 static struct gdbarch *
 mn10300_gdbarch_init (struct gdbarch_info info,
 		      struct gdbarch_list *arches)
@@ -999,6 +1018,9 @@ mn10300_gdbarch_init (struct gdbarch_inf
   set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
   set_gdbarch_num_regs (gdbarch, num_regs);
   set_gdbarch_do_registers_info (gdbarch, mn10300_do_registers_info);
+  set_gdbarch_stab_reg_to_regnum (gdbarch, mn10300_stab_reg_to_regnum);
+  set_gdbarch_dwarf_reg_to_regnum (gdbarch, mn10300_stab_reg_to_regnum);
+  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_stab_reg_to_regnum);
 
   tdep->am33_mode = am33_mode;