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authorGabe Black <gblack@eecs.umich.edu>2010-06-02 12:58:02 -0500
committerGabe Black <gblack@eecs.umich.edu>2010-06-02 12:58:02 -0500
commitd082705b01d9ce648651c147636e8e9976406ab2 (patch)
tree08e02b2c537ce646ad53caccd6c5d5885b678c70
parent98693436368ef671681859d95f6bc4a0542a6a37 (diff)
downloadgem5-d082705b01d9ce648651c147636e8e9976406ab2.tar.xz
ARM: Hook the new branch instructions into the ARM decoder.
-rw-r--r--src/arch/arm/isa/decoder/arm.isa9
-rw-r--r--src/arch/arm/isa/formats/branch.isa52
2 files changed, 56 insertions, 5 deletions
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