From 38ce95db3b7cf471dcd3c12b784877c4dc238d6f Mon Sep 17 00:00:00 2001
From: Korey Sewell <ksewell@umich.edu>
Date: Mon, 20 Feb 2006 01:49:16 -0500
Subject: Support for All Jump Instructions ... Redo format for Branches and
 Jumps ( Must update NNPC not NPC )

Now all branches and jumps look like they auto-generate correctly from isa_parser.py!!!

arch/mips/isa/decoder.isa:
    Support for All Jump Instructions ..
arch/mips/isa/formats/branch.isa:
    Redo format for Branches and Jumps ( Must update NNPC not NPC )
arch/mips/isa/formats/util.isa:
    define clear_exe_inst_hazards for later use

--HG--
extra : convert_revision : 63618ed12ee6ed94c47d29619cc1cab2cbaf5cda
---
 arch/mips/isa/formats/branch.isa | 40 +++++++++++++++++++++++++---------------
 arch/mips/isa/formats/util.isa   | 10 ++++++++++
 2 files changed, 35 insertions(+), 15 deletions(-)

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

diff --git a/arch/mips/isa/formats/branch.isa b/arch/mips/isa/formats/branch.isa
index 1f7a6f330..fc207fd3f 100644
--- a/arch/mips/isa/formats/branch.isa
+++ b/arch/mips/isa/formats/branch.isa
@@ -250,20 +250,22 @@ output decoder {{
 }};
 
 def format Branch(code,*flags) {{
-    code = 'bool cond;\n\t' + code + '\n'
-
     #Add Link Code if Link instruction
     strlen = len(name)
     if name[strlen-2:] == 'al':
-        code += 'R31 = NPC + 4;\n'
+        code += 'R31 = NNPC;\n'
 
-    # condition code
-    code += 'if (cond) {'
-    code += '  NPC = NPC + disp;\n'
-    code += '  NNPC = NNPC + disp;\n } \n'
+    #Condition code
+    code = 'bool cond;\n' + code
+    code += 'if (cond) {\n'
+    #code += '//NPC=NPC: just placeholder to force parser to writeback NPC\n'
+    #code += '  NPC = NPC; \n'
+    code += '  NNPC = NPC + disp;\n'
+    code += '} \n'
 
     iop = InstObjParams(name, Name, 'Branch', CodeBlock(code),
                         ('IsDirectControl', 'IsCondControl'))
+
     header_output = BasicDeclare.subst(iop)
     decoder_output = BasicConstructor.subst(iop)
     decode_block = BasicDecode.subst(iop)
@@ -272,30 +274,38 @@ def format Branch(code,*flags) {{
 
 
 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 + 4;\n'
+        code += 'R31 = NNPC;\n'
 
-    #condition code
+    #Condition code
+    code = 'bool cond;\n' + code
     code += 'if (cond) {'
-    code += '  NPC = NPC + disp;\n'
-    code += '  NNPC = NNPC + disp;\n } \n'
+    #code += '//NPC=NPC: just placeholder to force parser to writeback NPC\n'
+    #code += 'NPC = NPC; \n'
+    code += 'NNPC = NPC + disp;\n'
+    code += '} \n'
 
 
     iop = InstObjParams(name, Name, 'Branch', CodeBlock(code),
                         ('IsDirectControl', 'IsCondControl','IsCondDelaySlot'))
+
     header_output = BasicDeclare.subst(iop)
     decoder_output = BasicConstructor.subst(iop)
     decode_block = BasicDecode.subst(iop)
     exec_output = BasicExecute.subst(iop)
 }};
 
-def format Unconditional(code,*flags) {{
-    iop = InstObjParams(name, Name, 'Jump', CodeBlock(code),
+def format Jump(code,*flags) {{
+    #Add Link Code if Link instruction
+    strlen = len(name)
+    if strlen >= 3 and name[2:3] == 'al':
+            code = 'R31 = NNPC;\n' + code
+
+    iop = InstObjParams(name, Name, 'Jump', CodeBlock(code),\
                         ('IsIndirectControl', 'IsUncondControl'))
+
     header_output = BasicDeclare.subst(iop)
     decoder_output = BasicConstructor.subst(iop)
     decode_block = BasicDecode.subst(iop)
diff --git a/arch/mips/isa/formats/util.isa b/arch/mips/isa/formats/util.isa
index c6dae6783..1eff92269 100644
--- a/arch/mips/isa/formats/util.isa
+++ b/arch/mips/isa/formats/util.isa
@@ -24,3 +24,13 @@ def UncondCtrlBase(name, Name, base_class, npc_expr, flags):
     return (header_output, decoder_output,
             JumpOrBranchDecode.subst(nolink_iop), exec_output)
 }};
+
+output exec {{
+
+    /// CLEAR ALL CPU INST/EXE HAZARDS
+    inline void
+    clear_exe_inst_hazards()
+    {
+        //CODE HERE
+    }
+}
-- 
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