/*
+ * Copyright (c) 2014 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) 2002-2005 The Regents of The University of Michigan
* All rights reserved.
*
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Kevin Lim
+ * Andreas Sandberg
*/
-#error "Cannot include this file"
+#ifndef __CPU_EXEC_CONTEXT_HH__
+#define __CPU_EXEC_CONTEXT_HH__
+
+#include "arch/registers.hh"
+#include "base/types.hh"
+#include "config/the_isa.hh"
+#include "cpu/static_inst_fwd.hh"
+#include "cpu/translation.hh"
+#include "sim/fault_fwd.hh"
/**
- * The ExecContext is not a usable class. It is simply here for
- * documentation purposes. It shows the interface that is used by the
- * ISA to access and change CPU state.
+ * The ExecContext is an abstract base class the provides the
+ * interface used by the ISA to manipulate the state of the CPU model.
+ *
+ * Register accessor methods in this class typically provide the index
+ * of the instruction's operand (e.g., 0 or 1), not the architectural
+ * register index, to simplify the implementation of register
+ * renaming. The architectural register index can be found by
+ * indexing into the instruction's own operand index table.
+ *
+ * @note The methods in this class typically take a raw pointer to the
+ * StaticInst is provided instead of a ref-counted StaticInstPtr to
+ * reduce overhead as an argument. This is fine as long as the
+ * implementation doesn't copy the pointer into any long-term storage
+ * (which is pretty hard to imagine they would have reason to do).
*/
class ExecContext {
- // The register accessor methods provide the index of the
- // instruction's operand (e.g., 0 or 1), not the architectural
- // register index, to simplify the implementation of register
- // renaming. We find the architectural register index by indexing
- // into the instruction's own operand index table. Note that a
- // raw pointer to the StaticInst is provided instead of a
- // ref-counted StaticInstPtr to reduce overhead. This is fine as
- // long as these methods don't copy the pointer into any long-term
- // storage (which is pretty hard to imagine they would have reason
- // to do).
+ public:
+ typedef TheISA::IntReg IntReg;
+ typedef TheISA::PCState PCState;
+ typedef TheISA::FloatReg FloatReg;
+ typedef TheISA::FloatRegBits FloatRegBits;
+ typedef TheISA::MiscReg MiscReg;
+
+ typedef TheISA::CCReg CCReg;
+
+ public:
+ /**
+ * @{
+ * @name Integer Register Interfaces
+ *
+ */
/** Reads an integer register. */
- uint64_t readIntReg(const StaticInst *si, int idx);
+ virtual IntReg readIntRegOperand(const StaticInst *si, int idx) = 0;
- /** Reads a floating point register of a specific width. */
- FloatReg readFloatReg(const StaticInst *si, int idx, int width);
+ /** Sets an integer register to a value. */
+ virtual void setIntRegOperand(const StaticInst *si,
+ int idx, IntReg val) = 0;
- /** Reads a floating point register of single register width. */
- FloatReg readFloatReg(const StaticInst *si, int idx);
+ /** @} */
- /** Reads a floating point register of a specific width in its
- * binary format, instead of by value. */
- FloatRegBits readFloatRegBits(const StaticInst *si, int idx, int width);
- /** Reads a floating point register in its binary format, instead
- * of by value. */
- FloatRegBits readFloatRegBits(const StaticInst *si, int idx);
+ /**
+ * @{
+ * @name Floating Point Register Interfaces
+ */
- /** Sets an integer register to a value. */
- void setIntReg(const StaticInst *si, int idx, uint64_t val);
+ /** Reads a floating point register of single register width. */
+ virtual FloatReg readFloatRegOperand(const StaticInst *si, int idx) = 0;
- /** Sets a floating point register of a specific width to a value. */
- void setFloatReg(const StaticInst *si, int idx, FloatReg val, int width);
+ /** Reads a floating point register in its binary format, instead
+ * of by value. */
+ virtual FloatRegBits readFloatRegOperandBits(const StaticInst *si,
+ int idx) = 0;
/** Sets a floating point register of single width to a value. */
- void setFloatReg(const StaticInst *si, int idx, FloatReg val);
-
- /** Sets the bits of a floating point register of a specific width
- * to a binary value. */
- void setFloatRegBits(const StaticInst *si, int idx,
- FloatRegBits val, int width);
+ virtual void setFloatRegOperand(const StaticInst *si,
+ int idx, FloatReg val) = 0;
/** Sets the bits of a floating point register of single width
* to a binary value. */
- void setFloatRegBits(const StaticInst *si, int idx, FloatRegBits val);
-
- /** Reads the PC. */
- uint64_t readPC();
- /** Reads the NextPC. */
- uint64_t readNextPC();
- /** Reads the Next-NextPC. Only for architectures like SPARC or MIPS. */
- uint64_t readNextNPC();
-
- /** Sets the PC. */
- void setPC(uint64_t val);
- /** Sets the NextPC. */
- void setNextPC(uint64_t val);
- /** Sets the Next-NextPC. Only for architectures like SPARC or MIPS. */
- void setNextNPC(uint64_t val);
-
- /** Reads a miscellaneous register. */
- MiscReg readMiscReg(int misc_reg);
-
- /** Reads a miscellaneous register, handling any architectural
- * side effects due to reading that register. */
- MiscReg readMiscRegWithEffect(int misc_reg);
-
- /** Sets a miscellaneous register. */
- void setMiscReg(int misc_reg, const MiscReg &val);
-
- /** Sets a miscellaneous register, handling any architectural
- * side effects due to writing that register. */
- void setMiscRegWithEffect(int misc_reg, const MiscReg &val);
-
- /** Records the effective address of the instruction. Only valid
- * for memory ops. */
- void setEA(Addr EA);
- /** Returns the effective address of the instruction. Only valid
- * for memory ops. */
- Addr getEA();
+ virtual void setFloatRegOperandBits(const StaticInst *si,
+ int idx, FloatRegBits val) = 0;
- /** Returns a pointer to the ThreadContext. */
- ThreadContext *tcBase();
+ /** @} */
+
+ /**
+ * @{
+ * @name Condition Code Registers
+ */
+ virtual CCReg readCCRegOperand(const StaticInst *si, int idx) = 0;
+ virtual void setCCRegOperand(const StaticInst *si, int idx, CCReg val) = 0;
+ /** @} */
- /** Reads an address, creating a memory request with the given
- * flags. Stores result of read in data. */
- template <class T>
- Fault read(Addr addr, T &data, unsigned flags);
+ /**
+ * @{
+ * @name Misc Register Interfaces
+ */
+ virtual MiscReg readMiscRegOperand(const StaticInst *si, int idx) = 0;
+ virtual void setMiscRegOperand(const StaticInst *si,
+ int idx, const MiscReg &val) = 0;
- /** Writes to an address, creating a memory request with the given
- * flags. Writes data to memory. For store conditionals, returns
- * the result of the store in res. */
- template <class T>
- Fault write(T data, Addr addr, unsigned flags, uint64_t *res);
+ /**
+ * Reads a miscellaneous register, handling any architectural
+ * side effects due to reading that register.
+ */
+ virtual MiscReg readMiscReg(int misc_reg) = 0;
+
+ /**
+ * Sets a miscellaneous register, handling any architectural
+ * side effects due to writing that register.
+ */
+ virtual void setMiscReg(int misc_reg, const MiscReg &val) = 0;
- /** Prefetches an address, creating a memory request with the
- * given flags. */
- void prefetch(Addr addr, unsigned flags);
+ /** @} */
+
+ /**
+ * @{
+ * @name PC Control
+ */
+ virtual PCState pcState() const = 0;
+ virtual void pcState(const PCState &val) = 0;
+ /** @} */
+
+ /**
+ * @{
+ * @name Memory Interface
+ */
+ /**
+ * Record the effective address of the instruction.
+ *
+ * @note Only valid for memory ops.
+ */
+ virtual void setEA(Addr EA) = 0;
+ /**
+ * Get the effective address of the instruction.
+ *
+ * @note Only valid for memory ops.
+ */
+ virtual Addr getEA() const = 0;
- /** Hints to the memory system that an address will be written to
- * soon, with the given size. Creates a memory request with the
- * given flags. */
- void writeHint(Addr addr, int size, unsigned flags);
+ virtual Fault readMem(Addr addr, uint8_t *data, unsigned int size,
+ unsigned int flags) = 0;
-#if FULL_SYSTEM
- /** Somewhat Alpha-specific function that handles returning from
- * an error or interrupt. */
- Fault hwrei();
+ virtual Fault writeMem(uint8_t *data, unsigned int size, Addr addr,
+ unsigned int flags, uint64_t *res) = 0;
+
+ /**
+ * Sets the number of consecutive store conditional failures.
+ */
+ virtual void setStCondFailures(unsigned int sc_failures) = 0;
+
+ /**
+ * Returns the number of consecutive store conditional failures.
+ */
+ virtual unsigned int readStCondFailures() const = 0;
+
+ /** @} */
+
+ /**
+ * @{
+ * @name SysCall Emulation Interfaces
+ */
+
+ /**
+ * Executes a syscall specified by the callnum.
+ */
+ virtual void syscall(int64_t callnum) = 0;
+
+ /** @} */
+
+ /** Returns a pointer to the ThreadContext. */
+ virtual ThreadContext *tcBase() = 0;
+
+ /**
+ * @{
+ * @name Alpha-Specific Interfaces
+ */
+
+ /**
+ * Somewhat Alpha-specific function that handles returning from an
+ * error or interrupt.
+ */
+ virtual Fault hwrei() = 0;
/**
* Check for special simulator handling of specific PAL calls. If
* return value is false, actual PAL call will be suppressed.
*/
- bool simPalCheck(int palFunc);
-#else
- /** Executes a syscall specified by the callnum. */
- void syscall(int64_t callnum);
+ virtual bool simPalCheck(int palFunc) = 0;
+
+ /** @} */
+
+ /**
+ * @{
+ * @name ARM-Specific Interfaces
+ */
+
+ virtual bool readPredicate() = 0;
+ virtual void setPredicate(bool val) = 0;
+
+ /** @} */
+
+ /**
+ * @{
+ * @name X86-Specific Interfaces
+ */
+
+ /**
+ * Invalidate a page in the DTLB <i>and</i> ITLB.
+ */
+ virtual void demapPage(Addr vaddr, uint64_t asn) = 0;
+
+ /** @} */
+
+ /**
+ * @{
+ * @name MIPS-Specific Interfaces
+ */
+
+#if THE_ISA == MIPS_ISA
+ virtual MiscReg readRegOtherThread(int regIdx,
+ ThreadID tid = InvalidThreadID) = 0;
+ virtual void setRegOtherThread(int regIdx, MiscReg val,
+ ThreadID tid = InvalidThreadID) = 0;
#endif
+
+ /** @} */
};
+
+#endif // __CPU_EXEC_CONTEXT_HH__
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