[rfa/ppc] Make registers unsigned

[Andrew Cagney <cagney@gnu.org>]

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Hello,

As far as I can tell PPC registers are unsigned.  At present they are 
signed and this leads to weird problems such as:

(gdb) x/i $sp
0xffff0000: ... error accessing memory at 0xffff0000
(gdb) x/i 0xffff0000
0xffff0000: sc
(gdb)

the attached changes this.

ok, 6.1?

Andrew

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2004-03-07  Andrew Cagney  <cagney@redhat.com>

	* rs6000-tdep.c (rs6000_register_virtual_type): Make registers
	unsigned.

Index: rs6000-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/rs6000-tdep.c,v
retrieving revision 1.183
diff -u -r1.183 rs6000-tdep.c
--- rs6000-tdep.c	2 Mar 2004 02:20:25 -0000	1.183
+++ rs6000-tdep.c	8 Mar 2004 21:56:35 -0000
@@ -1862,12 +1862,12 @@
 	case 0:
 	  return builtin_type_int0;
 	case 4:
-	  return builtin_type_int32;
+	  return builtin_type_uint32;
 	case 8:
 	  if (tdep->ppc_ev0_regnum <= n && n <= tdep->ppc_ev31_regnum)
 	    return builtin_type_vec64;
 	  else
-	    return builtin_type_int64;
+	    return builtin_type_uint64;
 	  break;
 	case 16:
 	  return builtin_type_vec128;