Base class for unconditional, PC-relative or absolute address branches. More...

#include <branch.hh>

Inheritance diagram for gem5::PowerISA::BranchOp:

Protected Member Functions
	BranchOp (const char *mnem, MachInst _machInst, OpClass __opClass)
	Constructor.

std::unique_ptr< PCStateBase >	branchTarget (ThreadContext *tc) const override
	Return the target address for an indirect branch (jump).

std::string	generateDisassembly (Addr pc, const loader::SymbolTable *symtab) const override
	Internal function to generate disassembly string.

virtual std::unique_ptr< PCStateBase >	branchTarget (const PCStateBase &pc) const
	Explicitly import the otherwise hidden branchTarget.

Protected Member Functions inherited from gem5::PowerISA::PCDependentDisassembly
	PCDependentDisassembly (const char *mnem, ExtMachInst _machInst, OpClass __opClass)
	Constructor.

const std::string &	disassemble (Addr pc, const loader::SymbolTable *symtab) const
	Return string representation of disassembled instruction.

Protected Member Functions inherited from gem5::PowerISA::PowerStaticInst
	PowerStaticInst (const char *mnem, ExtMachInst _machInst, OpClass __opClass)

uint32_t	insertCRField (uint32_t cr, uint32_t bf, uint32_t value) const

void	printReg (std::ostream &os, RegId reg) const
	Print a register name for disassembly given the unique dependence tag number (FP or int).

std::string	generateDisassembly (Addr pc, const loader::SymbolTable *symtab) const override
	Internal function to generate disassembly string.

void	advancePC (PCStateBase &pc_state) const override

void	advancePC (ThreadContext *tc) const override

std::unique_ptr< PCStateBase >	buildRetPC (const PCStateBase &cur_pc, const PCStateBase &call_pc) const override

size_t	asBytes (void *buf, size_t max_size) override
	Instruction classes can override this function to return a a representation of themselves as a blob of bytes, generally assumed to be that instructions ExtMachInst.

Protected Member Functions inherited from gem5::StaticInst
void	setRegIdxArrays (RegIdArrayPtr src, RegIdArrayPtr dest)
	Set the pointers which point to the arrays of source and destination register indices.

	StaticInst (const char *_mnemonic, OpClass op_class)
	Constructor.

template<typename T >
size_t	simpleAsBytes (void *buf, size_t max_size, const T &t)

Protected Attributes
bool	aa

bool	lk

int64_t	li

Protected Attributes inherited from gem5::PowerISA::PCDependentDisassembly
Addr	cachedPC
	Cached program counter from last disassembly.

const loader::SymbolTable *	cachedSymtab
	Cached symbol table pointer from last disassembly.

Protected Attributes inherited from gem5::PowerISA::PowerStaticInst
ExtMachInst	machInst

Protected Attributes inherited from gem5::StaticInst
std::bitset< Num_Flags >	flags
	Flag values for this instruction.

OpClass	_opClass
	See opClass().

uint8_t	_numSrcRegs = 0
	See numSrcRegs().

uint8_t	_numDestRegs = 0
	See numDestRegs().

std::array< uint8_t, MiscRegClass+1 >	_numTypedDestRegs = {}

size_t	_size = 0
	Instruction size in bytes.

const char *	mnemonic
	Base mnemonic (e.g., "add").

std::unique_ptr< std::string >	cachedDisassembly
	String representation of disassembly (lazily evaluated via disassemble()).

Additional Inherited Members
Public Types inherited from gem5::StaticInst
using	RegIdArrayPtr = RegId (StaticInst:: *)[]

Public Member Functions inherited from gem5::StaticInst
uint8_t	numSrcRegs () const
	Number of source registers.

uint8_t	numDestRegs () const
	Number of destination registers.

uint8_t	numDestRegs (RegClassType type) const
	Number of destination registers of a particular type.

bool	isNop () const

bool	isMemRef () const

bool	isLoad () const

bool	isStore () const

bool	isAtomic () const

bool	isStoreConditional () const

bool	isInstPrefetch () const

bool	isDataPrefetch () const

bool	isPrefetch () const

bool	isInteger () const

bool	isFloating () const

bool	isVector () const

bool	isMatrix () const

bool	isControl () const

bool	isCall () const

bool	isReturn () const

bool	isDirectCtrl () const

bool	isIndirectCtrl () const

bool	isCondCtrl () const

bool	isUncondCtrl () const

bool	isSerializing () const

bool	isSerializeBefore () const

bool	isSerializeAfter () const

bool	isSquashAfter () const

bool	isFullMemBarrier () const

bool	isReadBarrier () const

bool	isWriteBarrier () const

bool	isNonSpeculative () const

bool	isQuiesce () const

bool	isUnverifiable () const

bool	isPseudo () const

bool	isSyscall () const

bool	isMacroop () const

bool	isMicroop () const

bool	isDelayedCommit () const

bool	isLastMicroop () const

bool	isFirstMicroop () const

bool	isHtmStart () const

bool	isHtmStop () const

bool	isHtmCancel () const

bool	isInvalid () const

bool	isHtmCmd () const

void	setFirstMicroop ()

void	setLastMicroop ()

void	setDelayedCommit ()

void	setFlag (Flags f)

OpClass	opClass () const
	Operation class. Used to select appropriate function unit in issue.

const RegId &	destRegIdx (int i) const
	Return logical index (architectural reg num) of i'th destination reg.

void	setDestRegIdx (int i, const RegId &val)

const RegId &	srcRegIdx (int i) const
	Return logical index (architectural reg num) of i'th source reg.

void	setSrcRegIdx (int i, const RegId &val)

virtual uint64_t	getEMI () const

virtual	~StaticInst ()

virtual Fault	execute (ExecContext xc, trace::InstRecord traceData) const =0

virtual Fault	initiateAcc (ExecContext xc, trace::InstRecord traceData) const

virtual Fault	completeAcc (Packet pkt, ExecContext xc, trace::InstRecord *trace_data) const

size_t	size () const

virtual void	size (size_t newSize)

virtual StaticInstPtr	fetchMicroop (MicroPC upc) const
	Return the microop that goes with a particular micropc.

void	printFlags (std::ostream &outs, const std::string &separator) const
	Print a separator separated list of this instruction's set flag names on the given stream.

std::string	getName ()
	Return name of machine instruction.

Public Member Functions inherited from gem5::RefCounted
	RefCounted ()
	We initialize the reference count to zero and the first object to take ownership of it must increment it to one.

virtual	~RefCounted ()
	We make the destructor virtual because we're likely to have virtual functions on reference counted objects.

void	incref () const
	Increment the reference count.

void	decref () const
	Decrement the reference count and destroy the object if all references are gone.

Static Public Attributes inherited from gem5::StaticInst
static StaticInstPtr	nullStaticInstPtr
	Pointer to a statically allocated "null" instruction object.

Detailed Description

Base class for unconditional, PC-relative or absolute address branches.

Definition at line 74 of file branch.hh.

Constructor & Destructor Documentation

◆ BranchOp()

gem5::PowerISA::BranchOp::BranchOp	(	const char *	mnem,
		MachInst	_machInst,
		OpClass	__opClass )

inlineprotected

Constructor.

Definition at line 83 of file branch.hh.

Member Function Documentation

◆ branchTarget() [1/2]

std::unique_ptr< PCStateBase > gem5::StaticInst::branchTarget ( const PCStateBase & pc ) const

protectedvirtual

Explicitly import the otherwise hidden branchTarget.

Reimplemented from gem5::StaticInst.

Definition at line 341 of file static_inst.cc.

◆ branchTarget() [2/2]

std::unique_ptr< PCStateBase > gem5::BranchOp::branchTarget ( ThreadContext * tc ) const

overrideprotectedvirtual

Return the target address for an indirect branch (jump).

The register value is read from the supplied thread context, so the result is valid only if the thread context is about to execute the branch in question. Invalid if not an indirect branch (i.e. isIndirectCtrl() should be true).

Reimplemented from gem5::StaticInst.

Definition at line 60 of file branch.cc.

References aa, gem5::X86ISA::addr, gem5::ThreadContext::getReg(), gem5::PCStateBase::instAddr(), li, gem5::PowerISA::int_reg::Msr, and gem5::ThreadContext::pcState().