[PATCH] rx, rl78: Don't use internal_error() in dwarf_reg_to_regnum method

[Kevin Buettner <kevinb at redhat dot com>]

This change fixes a failure found by gdb.dwarf2/dw2-regno-invalid.exp.

It simply substitutes a call to warning() for a call to
internal_error() when an unmapped dwarf register number is
encountered.  Additionally, -1 is returned as the result of the
function instead of not returning at all - which is what happened when
internal_error() was used.
    
gdb/ChangeLog:
    
    	* rl78-tdep.c (rl78_dwarf_reg_to_regnum): Don't call
    	internal_error for bad dwarf numbers; issue a warning instead.
    	* rx-tdep.c (rx_dwarf_reg_to_regnum): Likewise.
---
 gdb/rl78-tdep.c | 7 ++++---
 gdb/rx-tdep.c   | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/gdb/rl78-tdep.c b/gdb/rl78-tdep.c
index c97e7c8..a792af3 100644
--- a/gdb/rl78-tdep.c
+++ b/gdb/rl78-tdep.c
@@ -1217,9 +1217,10 @@ rl78_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
   else if (reg == 37)
     return RL78_PC_REGNUM;
   else
-    internal_error (__FILE__, __LINE__,
-                    _("Undefined dwarf2 register mapping of reg %d"),
-		    reg);
+    {
+      warning (_("Unmapped DWARF Register #%d encountered."), reg);
+      return -1;
+    }
 }
 
 /* Implement the `register_sim_regno' gdbarch method.  */
diff --git a/gdb/rx-tdep.c b/gdb/rx-tdep.c
index a95c6d3..8627003 100644
--- a/gdb/rx-tdep.c
+++ b/gdb/rx-tdep.c
@@ -1011,9 +1011,10 @@ rx_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
   else if (reg == 17)
     return RX_PC_REGNUM;
   else
-    internal_error (__FILE__, __LINE__,
-                    _("Undefined dwarf2 register mapping of reg %d"),
-		    reg);
+    {
+      warning (_("Unmapped DWARF Register #%d encountered."), reg);
+      return -1;
+    }
 }
 
 /* Allocate and initialize a gdbarch object.  */