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////////////////////////////////////////////////////////////////////
//
// Branch instructions
//
output header {{
/**
* Base class for branch operations.
*/
class Branch : public SparcStaticInst
{
protected:
// Constructor
Branch(const char *mnem, MachInst _machInst, OpClass __opClass) :
SparcStaticInst(mnem, _machInst, __opClass)
{
}
std::string generateDisassembly(Addr pc,
const SymbolTable *symtab) const;
};
/**
* Base class for branch operations with an immediate displacement.
*/
class BranchDisp : public Branch
{
protected:
// Constructor
BranchDisp(const char *mnem, MachInst _machInst,
OpClass __opClass) :
Branch(mnem, _machInst, __opClass)
{
}
std::string generateDisassembly(Addr pc,
const SymbolTable *symtab) const;
int32_t disp;
};
/**
* Base class for branches with 19 bit displacements.
*/
class Branch19 : public BranchDisp
{
protected:
// Constructor
Branch19(const char *mnem, MachInst _machInst,
OpClass __opClass) :
BranchDisp(mnem, _machInst, __opClass)
{
disp = sign_ext(DISP19 << 2, 21);
}
};
/**
* Base class for branches with 22 bit displacements.
*/
class Branch22 : public BranchDisp
{
protected:
// Constructor
Branch22(const char *mnem, MachInst _machInst,
OpClass __opClass) :
BranchDisp(mnem, _machInst, __opClass)
{
disp = sign_ext(DISP22 << 2, 24);
}
};
/**
* Base class for branches with 30 bit displacements.
*/
class Branch30 : public BranchDisp
{
protected:
// Constructor
Branch30(const char *mnem, MachInst _machInst,
OpClass __opClass) :
BranchDisp(mnem, _machInst, __opClass)
{
disp = sign_ext(DISP30 << 2, 32);
}
};
/**
* Base class for 16bit split displacements.
*/
class BranchSplit : public BranchDisp
{
protected:
// Constructor
BranchSplit(const char *mnem, MachInst _machInst,
OpClass __opClass) :
BranchDisp(mnem, _machInst, __opClass)
{
disp = sign_ext((D16HI << 16) | (D16LO << 2), 18);
}
};
/**
* Base class for branches that use an immediate and a register to
* compute their displacements.
*/
class BranchImm13 : public Branch
{
protected:
// Constructor
BranchImm13(const char *mnem, MachInst _machInst, OpClass __opClass) :
Branch(mnem, _machInst, __opClass), imm(sign_ext(SIMM13, 13))
{
}
std::string generateDisassembly(Addr pc,
const SymbolTable *symtab) const;
int32_t imm;
};
}};
output decoder {{
std::string Branch::generateDisassembly(Addr pc,
const SymbolTable *symtab) const
{
std::stringstream response;
printMnemonic(response, mnemonic);
if (_numSrcRegs > 0)
{
printReg(response, _srcRegIdx[0]);
for(int x = 1; x < _numSrcRegs; x++)
{
response << ", ";
printReg(response, _srcRegIdx[x]);
}
}
if (_numDestRegs > 0)
{
if(_numSrcRegs > 0)
response << ", ";
printReg(response, _destRegIdx[0]);
}
return response.str();
}
std::string BranchImm13::generateDisassembly(Addr pc,
const SymbolTable *symtab) const
{
std::stringstream response;
printMnemonic(response, mnemonic);
if (_numSrcRegs > 0)
{
printReg(response, _srcRegIdx[0]);
for(int x = 1; x < _numSrcRegs; x++)
{
response << ", ";
printReg(response, _srcRegIdx[x]);
}
}
if(_numSrcRegs > 0)
response << ", ";
ccprintf(response, "0x%x", imm);
if (_numDestRegs > 0)
{
response << ", ";
printReg(response, _destRegIdx[0]);
}
return response.str();
}
std::string BranchDisp::generateDisassembly(Addr pc,
const SymbolTable *symtab) const
{
std::stringstream response;
std::string symbol;
Addr symbolAddr;
Addr target = disp + pc;
printMnemonic(response, mnemonic);
ccprintf(response, "0x%x", target);
if(symtab->findNearestSymbol(target, symbol, symbolAddr))
{
ccprintf(response, " <%s", symbol);
if(symbolAddr != target)
ccprintf(response, "+0x%x>", target - symbolAddr);
else
ccprintf(response, ">");
}
return response.str();
}
}};
def template BranchExecute {{
Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
Trace::InstRecord *traceData) const
{
//Attempt to execute the instruction
Fault fault = NoFault;
%(op_decl)s;
%(op_rd)s;
NNPC = xc->readNextNPC();
%(code)s;
if(fault == NoFault)
{
//Write the resulting state to the execution context
%(op_wb)s;
}
return fault;
}
}};
// Primary format for branch instructions:
def format Branch(code, *opt_flags) {{
(usesImm, code, immCode,
rString, iString) = splitOutImm(code)
iop = InstObjParams(name, Name, 'Branch', code, opt_flags)
header_output = BasicDeclare.subst(iop)
decoder_output = BasicConstructor.subst(iop)
exec_output = BranchExecute.subst(iop)
if usesImm:
imm_iop = InstObjParams(name, Name + 'Imm', 'BranchImm' + iString,
immCode, opt_flags)
header_output += BasicDeclare.subst(imm_iop)
decoder_output += BasicConstructor.subst(imm_iop)
exec_output += BranchExecute.subst(imm_iop)
decode_block = ROrImmDecode.subst(iop)
else:
decode_block = BasicDecode.subst(iop)
}};
// Primary format for branch instructions:
def format Branch19(code, *opt_flags) {{
codeBlk = CodeBlock(code)
iop = InstObjParams(name, Name, 'Branch19', codeBlk, opt_flags)
header_output = BasicDeclare.subst(iop)
decoder_output = BasicConstructor.subst(iop)
exec_output = BranchExecute.subst(iop)
decode_block = BasicDecode.subst(iop)
}};
// Primary format for branch instructions:
def format Branch22(code, *opt_flags) {{
codeBlk = CodeBlock(code)
iop = InstObjParams(name, Name, 'Branch22', codeBlk, opt_flags)
header_output = BasicDeclare.subst(iop)
decoder_output = BasicConstructor.subst(iop)
exec_output = BranchExecute.subst(iop)
decode_block = BasicDecode.subst(iop)
}};
// Primary format for branch instructions:
def format Branch30(code, *opt_flags) {{
codeBlk = CodeBlock(code)
iop = InstObjParams(name, Name, 'Branch30', codeBlk, opt_flags)
header_output = BasicDeclare.subst(iop)
decoder_output = BasicConstructor.subst(iop)
exec_output = BranchExecute.subst(iop)
decode_block = BasicDecode.subst(iop)
}};
// Primary format for branch instructions:
def format BranchSplit(code, *opt_flags) {{
codeBlk = CodeBlock(code)
iop = InstObjParams(name, Name, 'BranchSplit', codeBlk, opt_flags)
header_output = BasicDeclare.subst(iop)
decoder_output = BasicConstructor.subst(iop)
exec_output = BranchExecute.subst(iop)
decode_block = BasicDecode.subst(iop)
}};
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