Index: alpha-tdep.c
===================================================================
RCS file: /nile.c/cvs/Dev/gdb/gdb-6.3/gdb/alpha-tdep.c,v
retrieving revision 1.2
diff -u -p -r1.2 alpha-tdep.c
--- alpha-tdep.c	1 Dec 2004 01:52:42 -0000	1.2
+++ alpha-tdep.c	1 Dec 2004 01:58:08 -0000
@@ -47,6 +47,13 @@
 #include "alpha-tdep.h"
 
 
+/* Return the name of the REGNO register.
+
+   An empty name correspond to a register number that used to
+   be used for a virtual register. That virtual register has
+   been removed, but the index is still reserved to maintain
+   compatibility with existing remote alpha targets.  */
+
 static const char *
 alpha_register_name (int regno)
 {
@@ -73,13 +80,15 @@ alpha_register_name (int regno)
 static int
 alpha_cannot_fetch_register (int regno)
 {
-  return regno == ALPHA_ZERO_REGNUM;
+  return (regno == ALPHA_ZERO_REGNUM
+          || strlen (alpha_register_name (regno)) == 0);
 }
 
 static int
 alpha_cannot_store_register (int regno)
 {
-  return regno == ALPHA_ZERO_REGNUM;
+  return (regno == ALPHA_ZERO_REGNUM
+          || strlen (alpha_register_name (regno)) == 0);
 }
 
 static struct type *
Index: alpha-nat.c
===================================================================
RCS file: /nile.c/cvs/Dev/gdb/gdb-6.3/gdb/alpha-nat.c,v
retrieving revision 1.1
diff -u -p -r1.1 alpha-nat.c
--- alpha-nat.c	20 Oct 2004 23:11:33 -0000	1.1
+++ alpha-nat.c	1 Dec 2004 01:58:08 -0000
@@ -80,7 +80,7 @@ fetch_osf_core_registers (char *core_reg
     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
-    CF_PC, -1
+    CF_PC, -1, -1
 #else
 #define EFL (EF_SIZE / 8)
     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
@@ -91,7 +91,7 @@ fetch_osf_core_registers (char *core_reg
     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
-    EF_PC, -1
+    EF_PC, -1, -1
 #endif
   };