Add in exec_context.hh, which is a file for documentation purposes only. It describes the ExecContext interface that the ISA uses to access CPU state. Also #ifdef Erik's old copy code from the decoder so ExecContext doesn't need his two specific copy functions.

src/arch/alpha/isa/decoder.isa:
    Surround Erik's old copy code with #ifdefs.  This way the copy functions don't need to be included in the ExecContext (until somebody decides to add them back in).

--HG--
extra : convert_revision : 508ca387757a32bb616e5b4b07af17787a76970e

1 files changed, 161 insertions, 0 deletions

diff --git a/src/cpu/exec_context.hh b/src/cpu/exec_context.hh
new file mode 100644
index 000000000..f6e8d7c25
--- /dev/null
+++ b/src/cpu/exec_context.hh
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2002-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Kevin Lim
+ */
+
+#error "Cannot include this file"
+
+/**
+ * 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.
+ */
+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).
+
+    /** Reads an integer register. */
+    uint64_t readIntReg(const StaticInst *si, int idx);
+
+    /** Reads a floating point register of a specific width. */
+    FloatReg readFloatReg(const StaticInst *si, int idx, int width);
+
+    /** 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);
+
+    /** Sets an integer register to a value. */
+    void setIntReg(const StaticInst *si, int idx, uint64_t val);
+
+    /** Sets a floating point register of a specific width to a value. */
+    void setFloatReg(const StaticInst *si, int idx, FloatReg val, int width);
+
+    /** 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);
+
+    /** 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, Fault &fault);
+
+    /** Sets a miscellaneous register. */
+    Fault setMiscReg(int misc_reg, const MiscReg &val);
+
+    /** Sets a miscellaneous register, handling any architectural
+     * side effects due to writing that register. */
+    Fault 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();
+
+    /** Returns a pointer to the ThreadContext. */
+    ThreadContext *tcBase();
+
+    /** 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);
+
+    /** 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);
+
+    /** Prefetches an address, creating a memory request with the
+     * given flags. */
+    void prefetch(Addr addr, unsigned flags);
+
+    /** 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);
+
+#if FULL_SYSTEM
+    /** Somewhat Alpha-specific function that handles returning from
+     * an error or interrupt. */
+    Fault hwrei();
+    /** Reads the interrupt flags. */
+    int readIntrFlag();
+    /** Sets the interrupt flags to a value. */
+    void setIntrFlag(int val);
+
+    /**
+     * 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);
+#endif
+};