From a48c24b61eedf580645ff0294b225d1e69a9444b Mon Sep 17 00:00:00 2001
From: Korey Sewell <ksewell@umich.edu>
Date: Sat, 18 Feb 2006 23:17:45 -0500
Subject: Support NNPC and branch instructions ... Outputs to decoder.cc
 correctly

Edits to the CPU model may still need to be made to handle branch likely insts...

arch/isa_parser.py:
    add a NNPC operand ...
arch/mips/isa/base.isa:
    change SPARC to MIPS
arch/mips/isa/decoder.isa:
    typo < to >=
arch/mips/isa/formats/basic.isa:
    spacing
arch/mips/isa/formats/branch.isa:
    add code for branch instructions (still need adjustments for the branch likely)
arch/mips/isa/operands.isa:
    support for NNPC and R31
arch/mips/isa_traits.hh:
    NNPC Addr variable

--HG--
extra : convert_revision : df03d2a71c36dbc00270c2e3d7882b4f09ed97ad
---
 arch/mips/isa/formats/branch.isa | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

(limited to 'arch/mips/isa/formats/branch.isa')

diff --git a/arch/mips/isa/formats/branch.isa b/arch/mips/isa/formats/branch.isa
index d9dd433e3..1f7a6f330 100644
--- a/arch/mips/isa/formats/branch.isa
+++ b/arch/mips/isa/formats/branch.isa
@@ -45,12 +45,12 @@ output header {{
     {
       protected:
         /// target address (signed) Displacement .
-        int32_t targetOffset;
+        int32_t disp;
 
         /// Constructor.
         Branch(const char *mnem, MachInst _machInst, OpClass __opClass)
             : PCDependentDisassembly(mnem, _machInst, __opClass),
-              targetOffset(OFFSET << 2)
+              disp(OFFSET << 2)
         {
         }
 
@@ -67,12 +67,12 @@ output header {{
     {
       protected:
         /// target address (signed) Displacement .
-        int32_t targetOffset;
+        int32_t disp;
 
         /// Constructor.
         Branch(const char *mnem, MachInst _machInst, OpClass __opClass)
             : PCDependentDisassembly(mnem, _machInst, __opClass),
-              targetOffset(OFFSET << 2)
+              disp(OFFSET << 2)
         {
         }
 
@@ -255,9 +255,12 @@ def format Branch(code,*flags) {{
     #Add Link Code if Link instruction
     strlen = len(name)
     if name[strlen-2:] == 'al':
-        code += 'R31 = NPC + 8;\n'
+        code += 'R31 = NPC + 4;\n'
 
-    code += '\nif (cond) NPC = NPC + disp;\n';
+    # condition code
+    code += 'if (cond) {'
+    code += '  NPC = NPC + disp;\n'
+    code += '  NNPC = NNPC + disp;\n } \n'
 
     iop = InstObjParams(name, Name, 'Branch', CodeBlock(code),
                         ('IsDirectControl', 'IsCondControl'))
@@ -267,15 +270,20 @@ def format Branch(code,*flags) {{
     exec_output = BasicExecute.subst(iop)
 }};
 
+
 def format BranchLikely(code,*flags) {{
     code = 'bool cond;\n\t\t\t' + code
 
     #Add Link Code if Link instruction
     strlen = len(name)
     if name[strlen-3:] == 'all':
-        code += 'R31 = NPC + 8;\n'
+        code += 'R31 = NPC + 4;\n'
+
+    #condition code
+    code += 'if (cond) {'
+    code += '  NPC = NPC + disp;\n'
+    code += '  NNPC = NNPC + disp;\n } \n'
 
-    code = '\t\t\tif (cond) NPC = NPC + disp;\n';
 
     iop = InstObjParams(name, Name, 'Branch', CodeBlock(code),
                         ('IsDirectControl', 'IsCondControl','IsCondDelaySlot'))
-- 
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