1 files changed, 62 insertions, 0 deletions
diff --git a/sim/ppc/idecode_branch.h b/sim/ppc/idecode_branch.h
new file mode 100644
index 0000000..ecae98e
--- /dev/null
+++ b/sim/ppc/idecode_branch.h
@@ -0,0 +1,62 @@
+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+
+/* branch macro's:
+
+   The macro's below implement the semantics of the PowerPC jump
+   instructions. */
+
+
+/* If so required, update the Link Register with the next sequential
+   instruction address */
+
+#define UPDATE_LK \
+do { \
+  if (update_LK) { \
+    ppc_ia target = cia + 4; \
+    ppc_spr new_address = (ppc_spr)IEA_MASKED(ppc_is_64bit(processor), \
+			                      target); \
+    LR = new_address; \
+  } \
+  ITRACE(trace_branch, \
+	 ("UPDATE_LK - update_LK=%d lr=0x%x cia=0x%x\n", \
+	  update_LK, LR, cia); \
+} while (0)
+
+
+/* take the branch - absolute or relative - possibly updating the link
+   register */
+
+#define BRANCH(ADDRESS) \
+do { \
+  UPDATE_LK; \
+  if (update_AA) { \
+    ppc_ia target = (ppc_ia)(ADDRESS); \
+    nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \
+  } \
+  else { \
+    ppc_ia target = cia + ADDRESS; \
+    nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \
+  } \
+  PTRACE(trace_branch, \
+	 ("BRANCH - update_AA=%d update_LK=%d nia=0x%x cia=0x%x\n", \
+	  update_AA, update_LK, nia, cia); \
+} while (0)