diff options
author | Kevin Lim <ktlim@umich.edu> | 2006-06-16 17:19:36 -0400 |
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committer | Kevin Lim <ktlim@umich.edu> | 2006-06-16 17:19:36 -0400 |
commit | def9ea38b561676a89959882f92d3520a2e0224f (patch) | |
tree | ea4698e41533a762780b3bb201601c9347dc5f87 | |
parent | f4d0f92855a505448ddac4367d5d5c698d1e4282 (diff) | |
download | gem5-def9ea38b561676a89959882f92d3520a2e0224f.tar.xz |
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
-rw-r--r-- | src/arch/alpha/isa/decoder.isa | 4 | ||||
-rw-r--r-- | src/cpu/exec_context.hh | 161 |
2 files changed, 165 insertions, 0 deletions
diff --git a/src/arch/alpha/isa/decoder.isa b/src/arch/alpha/isa/decoder.isa index d2908b27a..f449d2d69 100644 --- a/src/arch/alpha/isa/decoder.isa +++ b/src/arch/alpha/isa/decoder.isa @@ -47,9 +47,11 @@ decode OPCODE default Unknown::unknown() { 0x23: ldt({{ Fa = Mem.df; }}); 0x2a: ldl_l({{ Ra.sl = Mem.sl; }}, mem_flags = LOCKED); 0x2b: ldq_l({{ Ra.uq = Mem.uq; }}, mem_flags = LOCKED); +#ifdef USE_COPY 0x20: MiscPrefetch::copy_load({{ EA = Ra; }}, {{ fault = xc->copySrcTranslate(EA); }}, inst_flags = [IsMemRef, IsLoad, IsCopy]); +#endif } format LoadOrPrefetch { @@ -69,9 +71,11 @@ decode OPCODE default Unknown::unknown() { 0x0f: stq_u({{ Mem.uq = Ra.uq; }}, {{ EA = (Rb + disp) & ~7; }}); 0x26: sts({{ Mem.ul = t_to_s(Fa.uq); }}); 0x27: stt({{ Mem.df = Fa; }}); +#ifdef USE_COPY 0x24: MiscPrefetch::copy_store({{ EA = Rb; }}, {{ fault = xc->copy(EA); }}, inst_flags = [IsMemRef, IsStore, IsCopy]); +#endif } format StoreCond { 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 +}; |