[PATCH 7/8] Implement unconditional_branch_address method for rl78

[Kevin Buettner <kevinb@redhat.com>]

Implement unconditional_branch_address method for rl78.

gdb/ChangeLog:
    
    	* rl78-tdep.c (rl78_unconditional_branch_address): New function.
    	(rl78_gdbarch_init): Register rl78_unconditional_branch_address.
---
 gdb/rl78-tdep.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/gdb/rl78-tdep.c b/gdb/rl78-tdep.c
index a5861d8..98129cc 100644
--- a/gdb/rl78-tdep.c
+++ b/gdb/rl78-tdep.c
@@ -1365,6 +1365,31 @@ rl78_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
   return rl78_make_data_address (sp + 4);
 }
 
+/* Implement the unconditional_branch_address gdbarch method.  */
+
+static CORE_ADDR
+rl78_unconditional_branch_address (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  int bytes_read;
+  RL78_Opcode_Decoded opc;
+  struct rl78_get_opcode_byte_handle opcode_handle;
+
+  opcode_handle.pc = pc;
+
+  bytes_read = rl78_decode_opcode (pc, &opc, rl78_get_opcode_byte,
+                                   &opcode_handle);
+
+  if (bytes_read > 0
+      && opc.id == RLO_branch
+      && opc.op[0].type == RL78_Operand_Immediate)
+    {
+      LONGEST l = opc.op[0].addend;
+
+      return (CORE_ADDR) l;
+    }
+
+  return 0;
+}
 /* Allocate and initialize a gdbarch object.  */
 
 static struct gdbarch *
@@ -1491,6 +1516,10 @@ rl78_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Virtual tables.  */
   set_gdbarch_vbit_in_delta (gdbarch, 1);
 
+  /* Unconditional Branch.  */
+  set_gdbarch_unconditional_branch_address (gdbarch,
+                                            rl78_unconditional_branch_address);
+
   return gdbarch;
 }