From d082705b01d9ce648651c147636e8e9976406ab2 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Wed, 2 Jun 2010 12:58:02 -0500
Subject: ARM: Hook the new branch instructions into the ARM decoder.

---
 src/arch/arm/isa/decoder/arm.isa    |  9 +++----
 src/arch/arm/isa/formats/branch.isa | 52 +++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 5 deletions(-)

(limited to 'src/arch')

diff --git a/src/arch/arm/isa/decoder/arm.isa b/src/arch/arm/isa/decoder/arm.isa
index 717bd1857..06f540717 100644
--- a/src/arch/arm/isa/decoder/arm.isa
+++ b/src/arch/arm/isa/decoder/arm.isa
@@ -129,7 +129,7 @@ format DataOp {
                     }
                 }
                 0x1: decode OPCODE {
-                    0x9: BranchExchange::oldbx({{ }});
+                    0x9: ArmBx::armBx();
                     0xb: PredOp::clz({{
                         Rd = ((Rm == 0) ? 32 : (31 - findMsbSet(Rm)));
                     }});
@@ -138,7 +138,7 @@ format DataOp {
                     0x9: WarnUnimpl::bxj();
                 }
                 0x3: decode OPCODE {
-                    0x9: BranchExchange::oldblx({{ }}, Link);
+                    0x9: ArmBlxReg::armBlxReg();
                 }
                 0x5: decode OPCODE {
                     0x8: WarnUnimpl::qadd();
@@ -264,9 +264,8 @@ format DataOp {
     }
     0x4: ArmMacroMem::armMacroMem();
     0x5: decode OPCODE_24 {
-        // Branch (and Link) Instructions
-        0: Branch::oldb({{ }});
-        1: Branch::oldbl({{ }}, Link);
+        0: ArmBBlxImm::armBBlxImm();
+        1: ArmBlBlxImm::armBlBlxImm();
     }
     0x6: decode CPNUM {
         0xb: decode LOADOP {
diff --git a/src/arch/arm/isa/formats/branch.isa b/src/arch/arm/isa/formats/branch.isa
index efe91f039..62a6e40c2 100644
--- a/src/arch/arm/isa/formats/branch.isa
+++ b/src/arch/arm/isa/formats/branch.isa
@@ -1,5 +1,17 @@
 // -*- mode:c++ -*-
 
+// Copyright (c) 2010 ARM Limited
+// All rights reserved
+//
+// The license below extends only to copyright in the software and shall
+// not be construed as granting a license to any other intellectual
+// property including but not limited to intellectual property relating
+// to a hardware implementation of the functionality of the software
+// licensed hereunder.  You may use the software subject to the license
+// terms below provided that you ensure that this notice is replicated
+// unmodified and in its entirety in all distributions of the software,
+// modified or unmodified, in source code or in binary form.
+//
 // Copyright (c) 2007-2008 The Florida State University
 // All rights reserved.
 //
@@ -33,6 +45,46 @@
 // Control transfer instructions
 //
 
+def format ArmBBlxImm() {{
+    decode_block = '''
+        if (machInst.condCode == 0xF) {
+            int32_t imm = (sext<26>(bits(machInst, 23, 0) << 2)) |
+                          (bits(machInst, 24) << 1);
+            return new BlxImm(machInst, imm);
+        } else {
+            return new B(machInst, sext<26>(bits(machInst, 23, 0) << 2),
+                         (ConditionCode)(uint32_t)machInst.condCode);
+        }
+    '''
+}};
+
+def format ArmBlBlxImm() {{
+    decode_block = '''
+        if (machInst.condCode == 0xF) {
+            int32_t imm = (sext<26>(bits(machInst, 23, 0) << 2)) |
+                          (bits(machInst, 24) << 1);
+            return new BlxImm(machInst, imm);
+        } else {
+            return new Bl(machInst, sext<26>(bits(machInst, 23, 0) << 2),
+                          (ConditionCode)(uint32_t)machInst.condCode);
+        }
+    '''
+}};
+
+def format ArmBx() {{
+    decode_block = '''
+        return new BxReg(machInst, (IntRegIndex)(uint32_t)bits(machInst, 3, 0),
+                         (ConditionCode)(uint32_t)machInst.condCode);
+    '''
+}};
+
+def format ArmBlxReg() {{
+    decode_block = '''
+        return new BlxReg(machInst, (IntRegIndex)(uint32_t)bits(machInst, 3, 0),
+                          (ConditionCode)(uint32_t)machInst.condCode);
+    '''
+}};
+
 def format Branch(code,*opt_flags) {{
 
     #Build Instruction Flags
-- 
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