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-rw-r--r--src/arch/SConscript1
-rw-r--r--src/arch/alpha/predecoder.hh107
-rw-r--r--src/arch/alpha/utility.hh13
-rw-r--r--src/arch/mips/predecoder.hh100
-rw-r--r--src/arch/mips/utility.hh13
-rw-r--r--src/arch/sparc/predecoder.hh112
-rw-r--r--src/arch/sparc/utility.hh16
-rw-r--r--src/arch/x86/SConscript2
-rw-r--r--src/arch/x86/isa/formats/unknown.isa3
-rw-r--r--src/arch/x86/predecoder.hh412
-rw-r--r--src/arch/x86/predecoder_tables.cc143
-rw-r--r--src/arch/x86/types.hh71
-rw-r--r--src/arch/x86/utility.hh16
-rw-r--r--src/cpu/base.hh8
-rw-r--r--src/cpu/o3/fetch.hh4
-rw-r--r--src/cpu/o3/fetch_impl.hh12
-rw-r--r--src/cpu/simple/atomic.cc32
-rw-r--r--src/cpu/simple/base.cc55
-rw-r--r--src/cpu/simple/base.hh11
-rw-r--r--src/cpu/static_inst.hh6
20 files changed, 1034 insertions, 103 deletions
diff --git a/src/arch/SConscript b/src/arch/SConscript
index c3ff69f46..0ac25b6c7 100644
--- a/src/arch/SConscript
+++ b/src/arch/SConscript
@@ -51,6 +51,7 @@ isa_switch_hdrs = Split('''
locked_mem.hh
mmaped_ipr.hh
process.hh
+ predecoder.hh
regfile.hh
remote_gdb.hh
stacktrace.hh
diff --git a/src/arch/alpha/predecoder.hh b/src/arch/alpha/predecoder.hh
new file mode 100644
index 000000000..4e89f53a6
--- /dev/null
+++ b/src/arch/alpha/predecoder.hh
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2006 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: Gabe Black
+ */
+
+#ifndef __ARCH_ALPHA_PREDECODER_HH__
+#define __ARCH_ALPHA_PREDECODER_HH__
+
+#include "arch/alpha/types.hh"
+#include "base/misc.hh"
+#include "sim/host.hh"
+
+class ThreadContext;
+
+namespace AlphaISA
+{
+ class Predecoder
+ {
+ protected:
+ ThreadContext * tc;
+ //The pc of the current instruction
+ Addr fetchPC;
+ //The extended machine instruction being generated
+ ExtMachInst ext_inst;
+
+ public:
+ Predecoder(ThreadContext * _tc) : tc(_tc)
+ {}
+
+ ThreadContext * getTC()
+ {
+ return tc;
+ }
+
+ void setTC(ThreadContext * _tc)
+ {
+ tc = _tc;
+ }
+
+ void process()
+ {
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when there is control flow.
+ void moreBytes(Addr pc, Addr off, MachInst inst)
+ {
+ fetchPC = pc;
+ assert(off == 0);
+ ext_inst = inst;
+#if FULL_SYSTEM
+ if (pc && 0x1)
+ ext_inst|=(static_cast<ExtMachInst>(pc & 0x1) << 32);
+#endif
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when instructions are executed in order.
+ void moreBytes(MachInst machInst)
+ {
+ moreBytes(fetchPC + sizeof(machInst), 0, machInst);
+ }
+
+ bool needMoreBytes()
+ {
+ return true;
+ }
+
+ bool extMachInstReady()
+ {
+ return true;
+ }
+
+ //This returns a constant reference to the ExtMachInst to avoid a copy
+ const ExtMachInst & getExtMachInst()
+ {
+ return ext_inst;
+ }
+ };
+};
+
+#endif // __ARCH_ALPHA_PREDECODER_HH__
diff --git a/src/arch/alpha/utility.hh b/src/arch/alpha/utility.hh
index b7844c7eb..c20394a92 100644
--- a/src/arch/alpha/utility.hh
+++ b/src/arch/alpha/utility.hh
@@ -48,19 +48,6 @@ namespace AlphaISA
return (tc->readMiscRegNoEffect(AlphaISA::IPR_DTB_CM) & 0x18) != 0;
}
- static inline ExtMachInst
- makeExtMI(MachInst inst, Addr pc) {
-#if FULL_SYSTEM
- ExtMachInst ext_inst = inst;
- if (pc && 0x1)
- return ext_inst|=(static_cast<ExtMachInst>(pc & 0x1) << 32);
- else
- return ext_inst;
-#else
- return ExtMachInst(inst);
-#endif
- }
-
inline bool isCallerSaveIntegerRegister(unsigned int reg) {
panic("register classification not implemented");
return (reg >= 1 && reg <= 8 || reg >= 22 && reg <= 25 || reg == 27);
diff --git a/src/arch/mips/predecoder.hh b/src/arch/mips/predecoder.hh
new file mode 100644
index 000000000..a25cce8a7
--- /dev/null
+++ b/src/arch/mips/predecoder.hh
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2006 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: Gabe Black
+ */
+
+#ifndef __ARCH_MIPS_PREDECODER_HH__
+#define __ARCH_MIPS_PREDECODER_HH__
+
+#include "arch/mips/types.hh"
+#include "base/misc.hh"
+#include "sim/host.hh"
+
+class ThreadContext;
+
+namespace MipsISA
+{
+ class Predecoder
+ {
+ protected:
+ ThreadContext * tc;
+ //The extended machine instruction being generated
+ ExtMachInst emi;
+
+ public:
+ Predecoder(ThreadContext * _tc) : tc(_tc)
+ {}
+
+ ThreadContext * getTC()
+ {
+ return tc;
+ }
+
+ void setTC(ThreadContext * _tc)
+ {
+ tc = _tc;
+ }
+
+ void process()
+ {
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when there is control flow.
+ void moreBytes(Addr currPC, Addr off, MachInst inst)
+ {
+ assert(off == 0);
+ emi = inst;
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when instructions are executed in order.
+ void moreBytes(MachInst machInst)
+ {
+ moreBytes(0, 0, machInst);
+ }
+
+ bool needMoreBytes()
+ {
+ return true;
+ }
+
+ bool extMachInstReady()
+ {
+ return true;
+ }
+
+ //This returns a constant reference to the ExtMachInst to avoid a copy
+ const ExtMachInst & getExtMachInst()
+ {
+ return emi;
+ }
+ };
+};
+
+#endif // __ARCH_MIPS_PREDECODER_HH__
diff --git a/src/arch/mips/utility.hh b/src/arch/mips/utility.hh
index b5c1e31e1..12db1de57 100644
--- a/src/arch/mips/utility.hh
+++ b/src/arch/mips/utility.hh
@@ -88,19 +88,6 @@ namespace MipsISA {
return 0;
}
- static inline ExtMachInst
- makeExtMI(MachInst inst, ThreadContext * xc) {
-#if FULL_SYSTEM
- ExtMachInst ext_inst = inst;
- if (xc->readPC() && 0x1)
- return ext_inst|=(static_cast<ExtMachInst>(xc->readPC() & 0x1) << 32);
- else
- return ext_inst;
-#else
- return ExtMachInst(inst);
-#endif
- }
-
inline void startupCPU(ThreadContext *tc, int cpuId)
{
tc->activate(0);
diff --git a/src/arch/sparc/predecoder.hh b/src/arch/sparc/predecoder.hh
new file mode 100644
index 000000000..71b14b020
--- /dev/null
+++ b/src/arch/sparc/predecoder.hh
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2006 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: Gabe Black
+ */
+
+#ifndef __ARCH_SPARC_PREDECODER_HH__
+#define __ARCH_SPARC_PREDECODER_HH__
+
+#include "arch/sparc/types.hh"
+#include "base/misc.hh"
+#include "sim/host.hh"
+
+class ThreadContext;
+
+namespace SparcISA
+{
+ class Predecoder
+ {
+ protected:
+ ThreadContext * tc;
+ //The extended machine instruction being generated
+ ExtMachInst emi;
+
+ public:
+ Predecoder(ThreadContext * _tc) : tc(_tc)
+ {}
+
+ ThreadContext * getTC()
+ {
+ return tc;
+ }
+
+ void setTC(ThreadContext * _tc)
+ {
+ tc = _tc;
+ }
+
+ void process()
+ {
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when there is control flow.
+ void moreBytes(Addr currPC, Addr off, MachInst inst)
+ {
+ assert(off == 0);
+
+ emi = inst;
+ //The I bit, bit 13, is used to figure out where the ASI
+ //should come from. Use that in the ExtMachInst. This is
+ //slightly redundant, but it removes the need to put a condition
+ //into all the execute functions
+ if(inst & (1 << 13))
+ emi |= (static_cast<ExtMachInst>(
+ tc->readMiscRegNoEffect(MISCREG_ASI))
+ << (sizeof(MachInst) * 8));
+ else
+ emi |= (static_cast<ExtMachInst>(bits(inst, 12, 5))
+ << (sizeof(MachInst) * 8));
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when instructions are executed in order.
+ void moreBytes(MachInst machInst)
+ {
+ moreBytes(0, 0, machInst);
+ }
+
+ bool needMoreBytes()
+ {
+ return true;
+ }
+
+ bool extMachInstReady()
+ {
+ return true;
+ }
+
+ //This returns a constant reference to the ExtMachInst to avoid a copy
+ const ExtMachInst & getExtMachInst()
+ {
+ return emi;
+ }
+ };
+};
+
+#endif // __ARCH_SPARC_PREDECODER_HH__
diff --git a/src/arch/sparc/utility.hh b/src/arch/sparc/utility.hh
index dc9201401..1458231f2 100644
--- a/src/arch/sparc/utility.hh
+++ b/src/arch/sparc/utility.hh
@@ -48,22 +48,6 @@ namespace SparcISA
tc->readMiscRegNoEffect(MISCREG_HPSTATE & (1 << 2)));
}
- inline ExtMachInst
- makeExtMI(MachInst inst, ThreadContext * xc) {
- ExtMachInst emi = (MachInst) inst;
- //The I bit, bit 13, is used to figure out where the ASI
- //should come from. Use that in the ExtMachInst. This is
- //slightly redundant, but it removes the need to put a condition
- //into all the execute functions
- if(inst & (1 << 13))
- emi |= (static_cast<ExtMachInst>(xc->readMiscRegNoEffect(MISCREG_ASI))
- << (sizeof(MachInst) * 8));
- else
- emi |= (static_cast<ExtMachInst>(bits(inst, 12, 5))
- << (sizeof(MachInst) * 8));
- return emi;
- }
-
inline bool isCallerSaveIntegerRegister(unsigned int reg) {
panic("register classification not implemented");
return false;
diff --git a/src/arch/x86/SConscript b/src/arch/x86/SConscript
index f49225758..f693caf6f 100644
--- a/src/arch/x86/SConscript
+++ b/src/arch/x86/SConscript
@@ -84,11 +84,11 @@
# Authors: Gabe Black
Import('*')
-
if env['TARGET_ISA'] == 'x86':
Source('floatregfile.cc')
Source('intregfile.cc')
Source('miscregfile.cc')
+ Source('predecoder_tables.cc')
Source('regfile.cc')
Source('remote_gdb.cc')
diff --git a/src/arch/x86/isa/formats/unknown.isa b/src/arch/x86/isa/formats/unknown.isa
index 605ddcb69..43ddc20c1 100644
--- a/src/arch/x86/isa/formats/unknown.isa
+++ b/src/arch/x86/isa/formats/unknown.isa
@@ -120,7 +120,8 @@ output exec {{
Fault Unknown::execute(%(CPU_exec_context)s *xc,
Trace::InstRecord *traceData) const
{
- panic("No instructions are implemented for X86!\n");
+ warn("No instructions are implemented for X86!\n");
+ return NoFault;
}
}};
diff --git a/src/arch/x86/predecoder.hh b/src/arch/x86/predecoder.hh
new file mode 100644
index 000000000..371ce9db9
--- /dev/null
+++ b/src/arch/x86/predecoder.hh
@@ -0,0 +1,412 @@
+/*
+ * Copyright (c) 2007 The Hewlett-Packard Development Company
+ * All rights reserved.
+ *
+ * Redistribution and use of this software in source and binary forms,
+ * with or without modification, are permitted provided that the
+ * following conditions are met:
+ *
+ * The software must be used only for Non-Commercial Use which means any
+ * use which is NOT directed to receiving any direct monetary
+ * compensation for, or commercial advantage from such use. Illustrative
+ * examples of non-commercial use are academic research, personal study,
+ * teaching, education and corporate research & development.
+ * Illustrative examples of commercial use are distributing products for
+ * commercial advantage and providing services using the software for
+ * commercial advantage.
+ *
+ * If you wish to use this software or functionality therein that may be
+ * covered by patents for commercial use, please contact:
+ * Director of Intellectual Property Licensing
+ * Office of Strategy and Technology
+ * Hewlett-Packard Company
+ * 1501 Page Mill Road
+ * Palo Alto, California 94304
+ *
+ * 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 HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission. No right of
+ * sublicense is granted herewith. Derivatives of the software and
+ * output created using the software may be prepared, but only for
+ * Non-Commercial Uses. Derivatives of the software may be shared with
+ * others provided: (i) the others agree to abide by the list of
+ * conditions herein which includes the Non-Commercial Use restrictions;
+ * and (ii) such Derivatives of the software include the above copyright
+ * notice to acknowledge the contribution from this software where
+ * applicable, this list of conditions and the disclaimer below.
+ *
+ * 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: Gabe Black
+ */
+
+#ifndef __ARCH_X86_PREDECODER_HH__
+#define __ARCH_X86_PREDECODER_HH__
+
+#include "arch/x86/types.hh"
+#include "base/bitfield.hh"
+#include "base/misc.hh"
+#include "sim/host.hh"
+
+class ThreadContext;
+
+namespace X86ISA
+{
+ class Predecoder
+ {
+ private:
+ static const uint8_t Prefixes[256];
+ static const uint8_t UsesModRM[2][256];
+
+ protected:
+ ThreadContext * tc;
+ //The bytes to be predecoded
+ MachInst fetchChunk;
+ //The pc of the start of fetchChunk
+ Addr basePC;
+ //The offset into fetchChunk of current processing
+ int offset;
+ //The extended machine instruction being generated
+ ExtMachInst emi;
+
+ //State machine state
+ protected:
+ //Whether or not we're out of bytes
+ bool outOfBytes;
+ //Whether we've completed generating an ExtMachInst
+ bool emiIsReady;
+ //The size of the displacement value
+ int displacementSize;
+ int displacementCollected;
+ //The size of the immediate value
+ int immediateSize;
+ int immediateCollected;
+
+ //These are local to some of the states. I need to turn the states
+ //into inline functions to clean things up a bit.
+ int toGet;
+ int remaining;
+ MachInst partialDisp;
+
+ enum State {
+ Prefix,
+ Opcode,
+ ModRM,
+ SIB,
+ Displacement,
+ Immediate
+ };
+
+ State state;
+
+ public:
+ Predecoder(ThreadContext * _tc) :
+ tc(_tc), basePC(0), offset(0),
+ outOfBytes(true), emiIsReady(false),
+ state(Prefix)
+ {}
+
+ ThreadContext * getTC()
+ {
+ return tc;
+ }
+
+ void setTC(ThreadContext * _tc)
+ {
+ tc = _tc;
+ }
+
+ void process()
+ {
+ warn("About to process some bytes\n");
+ assert(!outOfBytes);
+ assert(!emiIsReady);
+ while(!emiIsReady && !outOfBytes)
+ {
+ uint8_t nextByte = (fetchChunk >> (offset * 8)) & 0xff;
+ switch(state)
+ {
+ case Prefix:
+ uint8_t prefix = Prefixes[nextByte];
+ switch(prefix)
+ {
+ //Operand size override prefixes
+ case OperandSizeOverride:
+ warn("Found operand size override prefix!\n");
+ offset++;
+ break;
+ case AddressSizeOverride:
+ warn("Found address size override prefix!\n");
+ offset++;
+ break;
+ //Segment override prefixes
+ case CSOverride:
+ warn("Found cs segment override!\n");
+ offset++;
+ break;
+ case DSOverride:
+ warn("Found ds segment override!\n");
+ offset++;
+ break;
+ case ESOverride:
+ warn("Found es segment override!\n");
+ offset++;
+ break;
+ case FSOverride:
+ warn("Found fs segment override!\n");
+ offset++;
+ break;
+ case GSOverride:
+ warn("Found gs segment override!\n");
+ offset++;
+ break;
+ case SSOverride:
+ warn("Found ss segment override!\n");
+ offset++;
+ break;
+ case Lock:
+ warn("Found lock prefix!\n");
+ offset++;
+ break;
+ case Rep:
+ warn("Found rep prefix!\n");
+ offset++;
+ break;
+ case Repne:
+ warn("Found repne prefix!\n");
+ offset++;
+ break;
+ case Rex:
+ warn("Found Rex prefix %#x!\n", nextByte);
+ offset++;
+ break;
+ case 0:
+ emi.twoByteOpcode = false;
+ state = Opcode;
+ break;
+ default:
+ panic("Unrecognized prefix %#x\n", nextByte);
+ }
+ break;
+ case Opcode:
+ if(nextByte == 0xf0)
+ {
+ warn("Found two byte opcode!\n");
+ emi.twoByteOpcode = true;
+ }
+ else
+ {
+ warn("Found opcode %#x!\n", nextByte);
+ if (UsesModRM[emi.twoByteOpcode ? 1 : 0][nextByte]) {
+ state = ModRM;
+ } else if(0 /* uses immediate */) {
+ //Figure out how big the immediate should be
+ immediateCollected = 0;
+ emi.immediate = 0;
+ state = Immediate;
+ } else {
+ emiIsReady = true;
+ state = Prefix;
+ }
+ }
+ offset++;
+ break;
+ case ModRM:
+ warn("Found modrm byte %#x!\n", nextByte);
+ if (0) {//in 16 bit mode
+ //figure out 16 bit displacement size
+ if(nextByte & 0xC7 == 0x06 ||
+ nextByte & 0xC0 == 0x40)
+ displacementSize = 1;
+ else if(nextByte & 0xC7 == 0x80)
+ displacementSize = 2;
+ else
+ displacementSize = 0;
+ } else {
+ //figure out 32/64 bit displacement size
+ if(nextByte & 0xC7 == 0x06 ||
+ nextByte & 0xC0 == 0x40)
+ displacementSize = 4;
+ else if(nextByte & 0xC7 == 0x80)
+ displacementSize = 2;
+ else
+ displacementSize = 4;
+ }
+ //If there's an SIB, get that next.
+ //There is no SIB in 16 bit mode.
+ if(nextByte & 0x7 == 4 &&
+ nextByte & 0xC0 != 0xC0) {
+ // && in 32/64 bit mode)
+ state = SIB;
+ } else if(displacementSize) {
+ displacementCollected = 0;
+ emi.displacement = 0;
+ state = Displacement;
+ } else if(immediateSize) {
+ immediateCollected = 0;
+ emi.immediate = 0;
+ state = Immediate;
+ } else {
+ emiIsReady = true;
+ state = Prefix;
+ }
+ //The ModRM byte is consumed no matter what
+ offset++;
+ break;
+ case SIB:
+ warn("Found SIB byte %#x!\n", nextByte);
+ offset++;
+ if(displacementSize) {
+ displacementCollected = 0;
+ emi.displacement = 0;
+ state = Displacement;
+ } else if(immediateSize) {
+ immediateCollected = 0;
+ emi.immediate = 0;
+ state = Immediate;
+ } else {
+ emiIsReady = true;
+ state = Prefix;
+ }
+ break;
+ case Displacement:
+ //Gather up the displacement, or at least as much of it
+ //as we can get.
+
+ //Figure out how many bytes we still need to get for the
+ //displacement.
+ toGet = displacementSize - displacementCollected;
+ //Figure out how many bytes are left in our "buffer"
+ remaining = sizeof(MachInst) - offset;
+ //Get as much as we need, up to the amount available.
+ toGet = toGet > remaining ? remaining : toGet;
+
+ //Shift the bytes we want to be all the way to the right
+ partialDisp = fetchChunk >> offset;
+ //Mask off what we don't want
+ partialDisp &= mask(toGet * 8);
+ //Shift it over to overlay with our displacement.
+ partialDisp <<= displacementCollected;
+ //Put it into our displacement
+ emi.displacement |= partialDisp;
+ //Update how many bytes we've collected.
+ displacementCollected += toGet;
+
+ if(displacementSize == displacementCollected) {
+ //Sign extend the displacement
+ switch(displacementSize)
+ {
+ case 1:
+ emi.displacement = sext<8>(emi.displacement);
+ break;
+ case 2:
+ emi.displacement = sext<16>(emi.displacement);
+ break;
+ case 4:
+ emi.displacement = sext<32>(emi.displacement);
+ break;
+ default:
+ panic("Undefined displacement size!\n");
+ }
+ if(immediateSize) {
+ immediateCollected = 0;
+ emi.immediate = 0;
+ state = Immediate;
+ } else {
+ emiIsReady = true;
+ state = Prefix;
+ }
+ }
+ break;
+ case Immediate:
+ //Gather up the displacement, or at least as much of it
+ //as we can get
+
+ //Figure out how many bytes we still need to get for the
+ //immediate.
+ toGet = immediateSize - immediateCollected;
+ //Figure out how many bytes are left in our "buffer"
+ remaining = sizeof(MachInst) - offset;
+ //Get as much as we need, up to the amount available.
+ toGet = toGet > remaining ? remaining : toGet;
+
+ //Shift the bytes we want to be all the way to the right
+ partialDisp = fetchChunk >> offset;
+ //Mask off what we don't want
+ partialDisp &= mask(toGet * 8);
+ //Shift it over to overlay with our immediate.
+ partialDisp <<= displacementCollected;
+ //Put it into our immediate
+ emi.displacement |= partialDisp;
+ //Update how many bytes we've collected.
+ displacementCollected += toGet;
+ if(immediateSize == immediateCollected)
+ {
+ emiIsReady = true;
+ state = Prefix;
+ }
+ break;
+ default:
+ panic("Unrecognized state! %d\n", state);
+ }
+ if(offset == sizeof(MachInst))
+ outOfBytes = true;
+ }
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when there is control flow.
+ void moreBytes(Addr currPC, Addr off, MachInst data)
+ {
+ basePC = currPC;
+ offset = off;
+ fetchChunk = data;
+ assert(off < sizeof(MachInst));
+ outOfBytes = false;
+ warn("About to call process.\n");
+ process();
+ }
+
+ //Use this to give data to the predecoder. This should be used
+ //when instructions are executed in order.
+ void moreBytes(MachInst machInst)
+ {
+ moreBytes(basePC + sizeof(machInst), 0, machInst);
+ }
+
+ bool needMoreBytes()
+ {
+ return outOfBytes;
+ }
+
+ bool extMachInstReady()
+ {
+ return emiIsReady;
+ }
+
+ //This returns a constant reference to the ExtMachInst to avoid a copy
+ const ExtMachInst & getExtMachInst()
+ {
+ assert(emiIsReady);
+ emiIsReady = false;
+ return emi;
+ }
+ };
+};
+
+#endif // __ARCH_X86_PREDECODER_HH__
diff --git a/src/arch/x86/predecoder_tables.cc b/src/arch/x86/predecoder_tables.cc
new file mode 100644
index 000000000..9304eee47
--- /dev/null
+++ b/src/arch/x86/predecoder_tables.cc
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2007 The Hewlett-Packard Development Company
+ * All rights reserved.
+ *
+ * Redistribution and use of this software in source and binary forms,
+ * with or without modification, are permitted provided that the
+ * following conditions are met:
+ *
+ * The software must be used only for Non-Commercial Use which means any
+ * use which is NOT directed to receiving any direct monetary
+ * compensation for, or commercial advantage from such use. Illustrative
+ * examples of non-commercial use are academic research, personal study,
+ * teaching, education and corporate research & development.
+ * Illustrative examples of commercial use are distributing products for
+ * commercial advantage and providing services using the software for
+ * commercial advantage.
+ *
+ * If you wish to use this software or functionality therein that may be
+ * covered by patents for commercial use, please contact:
+ * Director of Intellectual Property Licensing
+ * Office of Strategy and Technology
+ * Hewlett-Packard Company
+ * 1501 Page Mill Road
+ * Palo Alto, California 94304
+ *
+ * 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 HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission. No right of
+ * sublicense is granted herewith. Derivatives of the software and
+ * output created using the software may be prepared, but only for
+ * Non-Commercial Uses. Derivatives of the software may be shared with
+ * others provided: (i) the others agree to abide by the list of
+ * conditions herein which includes the Non-Commercial Use restrictions;
+ * and (ii) such Derivatives of the software include the above copyright
+ * notice to acknowledge the contribution from this software where
+ * applicable, this list of conditions and the disclaimer below.
+ *
+ * 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: Gabe Black
+ */
+
+#include "arch/x86/predecoder.hh"
+#include "arch/x86/types.hh"
+
+namespace X86ISA
+{
+ const uint8_t CS = CSOverride;
+ const uint8_t DS = DSOverride;
+ const uint8_t ES = ESOverride;
+ const uint8_t FS = FSOverride;
+ const uint8_t GS = GSOverride;
+ const uint8_t SS = SSOverride;
+
+ const uint8_t OO = OperandSizeOverride;
+ const uint8_t AO = AddressSizeOverride;
+ const uint8_t LO = Lock;
+ const uint8_t RE = Rep;
+ const uint8_t RN = Repne;
+ const uint8_t RX = Rex;
+
+ //This table identifies whether a byte is a prefix, and if it is,
+ //which prefix it is.
+ const uint8_t Predecoder::Prefixes[256] =
+ { //LSB
+// MSB 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F
+/* 0*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 1*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 2*/ 0 , 0 , 0 , 0 , 0 , 0 , ES, 0 , 0 , 0 , 0 , 0 , 0 , 0 , CS, 0,
+/* 3*/ 0 , 0 , 0 , 0 , 0 , 0 , SS, 0 , 0 , 0 , 0 , 0 , 0 , 0 , DS, 0,
+/* 4*/ RX, RX, RX, RX, RX, RX, RX, RX, RX, RX, RX, RX, RX, RX, RX, RX,
+/* 5*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 6*/ 0 , 0 , 0 , 0 , FS, GS, OO, AO, 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 7*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 8*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 9*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* A*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* B*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* C*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* D*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* E*/ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* F*/ LO, 0 , RN, RE, 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
+ };
+
+ //This table identifies whether a particular opcode uses the ModRM byte
+ const uint8_t Predecoder::UsesModRM[2][256] =
+ {//For one byte instructions
+ { //LSB
+// MSB 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F
+/* 0 */ 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0,
+/* 1 */ 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0,
+/* 2 */ 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0,
+/* 3 */ 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0,
+/* 4 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 5 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 6 */ 0 , 0 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 1 , 0 , 1 , 0 , 0 , 0 , 0,
+/* 7 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 8 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* 9 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* A */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* B */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* C */ 1 , 1 , 0 , 0 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* D */ 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* E */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* F */ 0 , 0 , 0 , 0 , 0 , 0 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 1 , 1
+ },
+ //For two byte instructions
+ { //LSB
+// MSB 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F
+/* 0 */ 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 1 , 0 , 1,
+/* 1 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 2 */ 1 , 1 , 1 , 1 , 1 , 0 , 1 , 0 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* 3 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 4 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* 5 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* 6 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* 7 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 1 , 1 , 1 , 1,
+/* 8 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* 9 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* A */ 0 , 0 , 0 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 1,
+/* B */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 1 , 1 , 1 , 1 , 1 , 1,
+/* C */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
+/* D */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* E */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
+/* F */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0
+ }
+ };
+}
diff --git a/src/arch/x86/types.hh b/src/arch/x86/types.hh
index 63f65eee5..68d95de94 100644
--- a/src/arch/x86/types.hh
+++ b/src/arch/x86/types.hh
@@ -59,13 +59,76 @@
#define __ARCH_X86_TYPES_HH__
#include <inttypes.h>
+#include <iostream>
namespace X86ISA
{
- //XXX This won't work
- typedef uint32_t MachInst;
- //XXX This won't work either
- typedef uint64_t ExtMachInst;
+ //This really determines how many bytes are passed to the predecoder.
+ typedef uint64_t MachInst;
+
+ enum Prefixes {
+ NoOverride = 0,
+ CSOverride = 1,
+ DSOverride = 2,
+ ESOverride = 3,
+ FSOverride = 4,
+ GSOverride = 5,
+ SSOverride = 6,
+ //The Rex prefix obviously doesn't fit in with the above, but putting
+ //it here lets us save double the space the enums take up.
+ Rex = 7,
+ //There can be only one segment override, so they share the
+ //first 3 bits in the legacyPrefixes bitfield.
+ SegmentOverride = 0x7,
+ OperandSizeOverride = 8,
+ AddressSizeOverride = 16,
+ Lock = 32,
+ Rep = 64,
+ Repne = 128
+ };
+
+ //The intermediate structure the x86 predecoder returns.
+ struct ExtMachInst
+ {
+ public: //XXX These should be hidden in the future
+
+ uint8_t legacyPrefixes;
+ uint8_t rexPrefix;
+ bool twoByteOpcode;
+ uint8_t opcode;
+ uint64_t immediate;
+ uint64_t displacement;
+
+ public:
+
+ //These are to pacify the decoder for now. This will go away once
+ //it can handle non integer inputs, and in the mean time allow me to
+ //excercise the predecoder a little.
+ operator unsigned int()
+ {
+ return 0;
+ }
+
+ ExtMachInst(unsigned int)
+ {;}
+
+ ExtMachInst()
+ {;}
+ };
+
+ inline static std::ostream &
+ operator << (std::ostream & os, const ExtMachInst & emi)
+ {
+ os << "{X86 ExtMachInst}";
+ return os;
+ }
+
+ inline static bool
+ operator == (const ExtMachInst &emi1, const ExtMachInst &emi2)
+ {
+ //Since this is empty, it's always equal
+ return true;
+ }
typedef uint64_t IntReg;
//XXX Should this be a 128 bit structure for XMM memory ops?
diff --git a/src/arch/x86/utility.hh b/src/arch/x86/utility.hh
index 1fbe1fffe..b616886a5 100644
--- a/src/arch/x86/utility.hh
+++ b/src/arch/x86/utility.hh
@@ -59,11 +59,22 @@
#define __ARCH_X86_UTILITY_HH__
#include "arch/x86/types.hh"
+#include "base/hashmap.hh"
#include "base/misc.hh"
#include "sim/host.hh"
class ThreadContext;
+namespace __hash_namespace {
+ template<>
+ struct hash<X86ISA::ExtMachInst> {
+ size_t operator()(const X86ISA::ExtMachInst &emi) const {
+ //Because these are all the same, return 0
+ return 0;
+ };
+ };
+}
+
namespace X86ISA
{
static inline bool
@@ -72,11 +83,6 @@ namespace X86ISA
return false;
}
- inline ExtMachInst
- makeExtMI(MachInst inst, ThreadContext * xc) {
- return inst;
- }
-
inline bool isCallerSaveIntegerRegister(unsigned int reg) {
panic("register classification not implemented");
return false;
diff --git a/src/cpu/base.hh b/src/cpu/base.hh
index 7167bfde0..4d8300186 100644
--- a/src/cpu/base.hh
+++ b/src/cpu/base.hh
@@ -34,11 +34,11 @@
#include <vector>
+#include "arch/isa_traits.hh"
#include "base/statistics.hh"
#include "config/full_system.hh"
#include "sim/eventq.hh"
#include "mem/mem_object.hh"
-#include "arch/isa_traits.hh"
#if FULL_SYSTEM
#include "arch/interrupts.hh"
@@ -50,6 +50,11 @@ class ThreadContext;
class System;
class Port;
+namespace TheISA
+{
+ class Predecoder;
+}
+
class CPUProgressEvent : public Event
{
protected:
@@ -125,6 +130,7 @@ class BaseCPU : public MemObject
protected:
std::vector<ThreadContext *> threadContexts;
+ std::vector<TheISA::Predecoder *> predecoders;
public:
diff --git a/src/cpu/o3/fetch.hh b/src/cpu/o3/fetch.hh
index 8347ed775..da7ce00f5 100644
--- a/src/cpu/o3/fetch.hh
+++ b/src/cpu/o3/fetch.hh
@@ -33,6 +33,7 @@
#define __CPU_O3_FETCH_HH__
#include "arch/utility.hh"
+#include "arch/predecoder.hh"
#include "base/statistics.hh"
#include "base/timebuf.hh"
#include "cpu/pc_event.hh"
@@ -338,6 +339,9 @@ class DefaultFetch
/** BPredUnit. */
BPredUnit branchPred;
+ /** Predecoder. */
+ TheISA::Predecoder predecoder;
+
/** Per-thread fetch PC. */
Addr PC[Impl::MaxThreads];
diff --git a/src/cpu/o3/fetch_impl.hh b/src/cpu/o3/fetch_impl.hh
index ac0149d18..1256dd233 100644
--- a/src/cpu/o3/fetch_impl.hh
+++ b/src/cpu/o3/fetch_impl.hh
@@ -103,6 +103,7 @@ DefaultFetch<Impl>::IcachePort::recvRetry()
template<class Impl>
DefaultFetch<Impl>::DefaultFetch(Params *params)
: branchPred(params),
+ predecoder(NULL),
decodeToFetchDelay(params->decodeToFetchDelay),
renameToFetchDelay(params->renameToFetchDelay),
iewToFetchDelay(params->iewToFetchDelay),
@@ -1117,13 +1118,10 @@ DefaultFetch<Impl>::fetch(bool &status_change)
inst = TheISA::gtoh(*reinterpret_cast<TheISA::MachInst *>
(&cacheData[tid][offset]));
-#if THE_ISA == ALPHA_ISA
- ext_inst = TheISA::makeExtMI(inst, fetch_PC);
-#elif THE_ISA == SPARC_ISA
- ext_inst = TheISA::makeExtMI(inst, cpu->thread[tid]->getTC());
-#elif THE_ISA == MIPS_ISA
- ext_inst = TheISA::makeExtMI(inst, cpu->thread[tid]->getTC());
-#endif
+ predecoder.setTC(cpu->thread[tid]->getTC());
+ predecoder.moreBytes(fetch_PC, 0, inst);
+
+ ext_inst = predecoder.getExtMachInst();
// Create a new DynInst from the instruction fetched.
DynInstPtr instruction = new DynInst(ext_inst,
diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc
index 6a14a8aa5..6f69b5ac4 100644
--- a/src/cpu/simple/atomic.cc
+++ b/src/cpu/simple/atomic.cc
@@ -516,17 +516,28 @@ AtomicSimpleCPU::tick()
Fault fault = setupFetchRequest(ifetch_req);
if (fault == NoFault) {
- ifetch_pkt->reinitFromRequest();
+ Tick icache_latency = 0;
+ bool icache_access = false;
+ dcache_access = false; // assume no dcache access
- Tick icache_latency = icachePort.sendAtomic(ifetch_pkt);
- // ifetch_req is initialized to read the instruction directly
- // into the CPU object's inst field.
+ //Fetch more instruction memory if necessary
+ if(predecoder.needMoreBytes())
+ {
+ icache_access = true;
+ ifetch_pkt->reinitFromRequest();
+
+ icache_latency = icachePort.sendAtomic(ifetch_pkt);
+ // ifetch_req is initialized to read the instruction directly
+ // into the CPU object's inst field.
+ }
- dcache_access = false; // assume no dcache access
preExecute();
- fault = curStaticInst->execute(this, traceData);
- postExecute();
+ if(curStaticInst)
+ {
+ fault = curStaticInst->execute(this, traceData);
+ postExecute();
+ }
// @todo remove me after debugging with legion done
if (curStaticInst && (!curStaticInst->isMicroOp() ||
@@ -534,7 +545,8 @@ AtomicSimpleCPU::tick()
instCnt++;
if (simulate_stalls) {
- Tick icache_stall = icache_latency - cycles(1);
+ Tick icache_stall =
+ icache_access ? icache_latency - cycles(1) : 0;
Tick dcache_stall =
dcache_access ? dcache_latency - cycles(1) : 0;
Tick stall_cycles = (icache_stall + dcache_stall) / cycles(1);
@@ -545,8 +557,8 @@ AtomicSimpleCPU::tick()
}
}
-
- advancePC(fault);
+ if(predecoder.needMoreBytes())
+ advancePC(fault);
}
if (_status != Idle)
diff --git a/src/cpu/simple/base.cc b/src/cpu/simple/base.cc
index 9feb09851..cd139492a 100644
--- a/src/cpu/simple/base.cc
+++ b/src/cpu/simple/base.cc
@@ -70,7 +70,7 @@ using namespace std;
using namespace TheISA;
BaseSimpleCPU::BaseSimpleCPU(Params *p)
- : BaseCPU(p), thread(NULL)
+ : BaseCPU(p), thread(NULL), predecoder(NULL)
{
#if FULL_SYSTEM
thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
@@ -367,18 +367,23 @@ BaseSimpleCPU::preExecute()
inst = gtoh(inst);
//If we're not in the middle of a macro instruction
if (!curMacroStaticInst) {
-#if THE_ISA == ALPHA_ISA
- StaticInstPtr instPtr = StaticInst::decode(makeExtMI(inst, thread->readPC()));
-#elif THE_ISA == SPARC_ISA
- StaticInstPtr instPtr = StaticInst::decode(makeExtMI(inst, thread->getTC()));
-#elif THE_ISA == X86_ISA
- StaticInstPtr instPtr = StaticInst::decode(makeExtMI(inst, thread->getTC()));
-#elif THE_ISA == MIPS_ISA
- //Mips doesn't do anything in it's MakeExtMI function right now,
- //so it won't be called.
- StaticInstPtr instPtr = StaticInst::decode(inst);
-#endif
- if (instPtr->isMacroOp()) {
+ StaticInstPtr instPtr = NULL;
+
+ //Predecode, ie bundle up an ExtMachInst
+ //This should go away once the constructor can be set up properly
+ predecoder.setTC(thread->getTC());
+ //If more fetch data is needed, pass it in.
+ if(predecoder.needMoreBytes())
+ predecoder.moreBytes(thread->readPC(), 0, inst);
+ else
+ predecoder.process();
+ //If an instruction is ready, decode it
+ if (predecoder.extMachInstReady())
+ instPtr = StaticInst::decode(predecoder.getExtMachInst());
+
+ //If we decoded an instruction and it's microcoded, start pulling
+ //out micro ops
+ if (instPtr && instPtr->isMacroOp()) {
curMacroStaticInst = instPtr;
curStaticInst = curMacroStaticInst->
fetchMicroOp(thread->readMicroPC());
@@ -391,17 +396,19 @@ BaseSimpleCPU::preExecute()
fetchMicroOp(thread->readMicroPC());
}
+ //If we decoded an instruction this "tick", record information about it.
+ if(curStaticInst)
+ {
+ traceData = Trace::getInstRecord(curTick, tc, curStaticInst,
+ thread->readPC());
- traceData = Trace::getInstRecord(curTick, tc, curStaticInst,
- thread->readPC());
-
- DPRINTF(Decode,"Decode: Decoded %s instruction (opcode: 0x%x): 0x%x\n",
- curStaticInst->getName(), curStaticInst->getOpcode(),
- curStaticInst->machInst);
+ DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
+ curStaticInst->getName(), curStaticInst->machInst);
#if FULL_SYSTEM
- thread->setInst(inst);
+ thread->setInst(inst);
#endif // FULL_SYSTEM
+ }
}
void
@@ -444,9 +451,9 @@ BaseSimpleCPU::advancePC(Fault fault)
fault->invoke(tc);
thread->setMicroPC(0);
thread->setNextMicroPC(1);
- } else {
+ } else if (predecoder.needMoreBytes()) {
//If we're at the last micro op for this instruction
- if (curStaticInst->isLastMicroOp()) {
+ if (curStaticInst && curStaticInst->isLastMicroOp()) {
//We should be working with a macro op
assert(curMacroStaticInst);
//Close out this macro op, and clean up the
@@ -465,13 +472,9 @@ BaseSimpleCPU::advancePC(Fault fault)
} else {
// go to the next instruction
thread->setPC(thread->readNextPC());
-#if ISA_HAS_DELAY_SLOT
thread->setNextPC(thread->readNextNPC());
thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
assert(thread->readNextPC() != thread->readNextNPC());
-#else
- thread->setNextPC(thread->readNextPC() + sizeof(MachInst));
-#endif
}
}
diff --git a/src/cpu/simple/base.hh b/src/cpu/simple/base.hh
index eae24014b..787259c96 100644
--- a/src/cpu/simple/base.hh
+++ b/src/cpu/simple/base.hh
@@ -33,6 +33,7 @@
#ifndef __CPU_SIMPLE_BASE_HH__
#define __CPU_SIMPLE_BASE_HH__
+#include "arch/predecoder.hh"
#include "base/statistics.hh"
#include "config/full_system.hh"
#include "cpu/base.hh"
@@ -63,6 +64,10 @@ class Process;
class RemoteGDB;
class GDBListener;
+namespace TheISA
+{
+ class Predecoder;
+}
class ThreadContext;
class Checkpoint;
@@ -74,7 +79,6 @@ namespace Trace {
class BaseSimpleCPU : public BaseCPU
{
protected:
- typedef TheISA::MachInst MachInst;
typedef TheISA::MiscReg MiscReg;
typedef TheISA::FloatReg FloatReg;
typedef TheISA::FloatRegBits FloatRegBits;
@@ -122,7 +126,10 @@ class BaseSimpleCPU : public BaseCPU
#endif
// current instruction
- MachInst inst;
+ TheISA::MachInst inst;
+
+ // The predecoder
+ TheISA::Predecoder predecoder;
// Static data storage
TheISA::LargestRead dataReg;
diff --git a/src/cpu/static_inst.hh b/src/cpu/static_inst.hh
index 416c8ab56..a58ac85d6 100644
--- a/src/cpu/static_inst.hh
+++ b/src/cpu/static_inst.hh
@@ -35,6 +35,7 @@
#include <string>
#include "arch/isa_traits.hh"
+#include "arch/utility.hh"
#include "sim/faults.hh"
#include "base/bitfield.hh"
#include "base/hashmap.hh"
@@ -439,9 +440,6 @@ class StaticInst : public StaticInstBase
//This is defined as inline below.
static StaticInstPtr decode(ExtMachInst mach_inst);
- /// Return opcode of machine instruction
- uint32_t getOpcode() { return bits(machInst, 31, 26);}
-
/// Return name of machine instruction
std::string getName() { return mnemonic; }
};
@@ -474,7 +472,7 @@ class StaticInstPtr : public RefCountingPtr<StaticInst>
/// Construct directly from machine instruction.
/// Calls StaticInst::decode().
- StaticInstPtr(TheISA::ExtMachInst mach_inst)
+ explicit StaticInstPtr(TheISA::ExtMachInst mach_inst)
: RefCountingPtr<StaticInst>(StaticInst::decode(mach_inst))
{
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 14:23:40 +0000