Steps towards setting up the infrastructure to allow the new CPU model to work in full system mode.

The major change is renaming the old ExecContext to CPUExecContext, and creating two new classes, ExecContext (an abstract class), and ProxyExecContext (a templated class that derives from ExecContext).

Code outside of the CPU continues to use ExecContext as normal (other than not being able to access variables within the XC).  The CPU uses the CPUExecContext, or however else it stores its own state.  It then creates a ProxyExecContext, templated on the class used to hold its state.  This proxy is passed to any code outside of the CPU that needs to access the XC.  This allows code outside of the CPU to use the ExecContext interface to access any state needed, without knowledge of how that state is laid out.

Note that these changes will not compile without the accompanying revision to automatically rename the shadow registers.

SConscript:
    Include new file, cpu_exec_context.cc.
arch/alpha/alpha_linux_process.cc:
arch/alpha/alpha_memory.cc:
arch/alpha/alpha_tru64_process.cc:
arch/alpha/arguments.cc:
arch/alpha/isa/decoder.isa:
arch/alpha/stacktrace.cc:
arch/alpha/vtophys.cc:
base/remote_gdb.cc:
cpu/intr_control.cc:
    Avoid directly accessing objects within the XC.
arch/alpha/ev5.cc:
    Avoid directly accessing objects within the XC.

    KernelStats have been moved to the BaseCPU instead of the XC.
arch/alpha/isa_traits.hh:
    Remove clearIprs().  It wasn't used very often and it did not work well with the proxy ExecContext.
cpu/base.cc:
    Place kernel stats within the BaseCPU instead of the ExecContext.

    For now comment out the profiling code sampling until its exact location is decided upon.
cpu/base.hh:
    Kernel stats are now in the BaseCPU instead of the ExecContext.
cpu/base_dyn_inst.cc:
cpu/base_dyn_inst.hh:
cpu/memtest/memtest.cc:
cpu/memtest/memtest.hh:
    Changes to support rename of old ExecContext to CPUExecContext.  See changeset for more details.
cpu/exetrace.cc:
    Remove unneeded include of exec_context.hh.
cpu/intr_control.hh:
cpu/o3/alpha_cpu_builder.cc:
    Remove unneeded include of exec_context.hh
cpu/o3/alpha_cpu.hh:
cpu/o3/alpha_cpu_impl.hh:
cpu/o3/cpu.cc:
cpu/o3/cpu.hh:
cpu/simple/cpu.cc:
cpu/simple/cpu.hh:
    Changes to support rename of old ExecContext to CPUExecContext.  See changeset for more details.

    Also avoid accessing anything directly from the XC.
cpu/pc_event.cc:
    Avoid accessing objects directly from the XC.
dev/tsunami_cchip.cc:
    Avoid accessing objects directly within the XC>
kern/freebsd/freebsd_system.cc:
kern/linux/linux_system.cc:
kern/linux/linux_threadinfo.hh:
kern/tru64/dump_mbuf.cc:
kern/tru64/tru64.hh:
kern/tru64/tru64_events.cc:
sim/syscall_emul.cc:
sim/syscall_emul.hh:
    Avoid accessing objects directly within the XC.
kern/kernel_stats.cc:
kern/kernel_stats.hh:
    Kernel stats no longer exist within the XC.
kern/system_events.cc:
    Avoid accessing objects directly within the XC.  Also kernel stats are now in the BaseCPU.
sim/process.cc:
sim/process.hh:
    Avoid accessing regs directly within an ExecContext.  Instead use a CPUExecContext to initialize the registers and copy them over.
cpu/cpu_exec_context.cc:
    Rename old ExecContext to CPUExecContext.  This is used by the old CPU models to store any necessary architectural state.  Also include the ProxyExecContext, which is used to access the CPUExecContext's state in code outside of the CPU.
cpu/cpu_exec_context.hh:
    Rename old ExecContext to CPUExecContext.  This is used by the old CPU models to store any necessary architectural state.  Also include the ProxyExecContext, which is used to access the CPUExecContext's state in code outside of the CPU.

    Remove kernel stats from the ExecContext.
sim/pseudo_inst.cc:
    Kernel stats now live within the CPU.

    Avoid accessing objects directly within the XC.

--HG--
rename : cpu/exec_context.cc => cpu/cpu_exec_context.cc
rename : cpu/exec_context.hh => cpu/cpu_exec_context.hh
extra : convert_revision : a75393a8945c80cca225b5e9d9c22a16609efb85

2 files changed, 98 insertions, 91 deletions

diff --git a/cpu/simple/cpu.cc b/cpu/simple/cpu.cc
index dd2d53c17..7c60b242f 100644
--- a/cpu/simple/cpu.cc
+++ b/cpu/simple/cpu.cc
@@ -44,6 +44,7 @@
 #include "base/stats/events.hh"
 #include "base/trace.hh"
 #include "cpu/base.hh"
+#include "cpu/cpu_exec_context.hh"
 #include "cpu/exec_context.hh"
 #include "cpu/exetrace.hh"
 #include "cpu/profile.hh"
@@ -94,7 +95,7 @@ SimpleCPU::init()
         ExecContext *xc = execContexts[i];
 
         // initialize CPU, including PC
-        TheISA::initCPU(&xc->regs, xc->cpu_id);
+        TheISA::initCPU(xc, xc->readCpuId());
     }
 #endif
 }
@@ -132,22 +133,24 @@ SimpleCPU::CacheCompletionEvent::description()
 }
 
 SimpleCPU::SimpleCPU(Params *p)
-    : BaseCPU(p), tickEvent(this, p->width), xc(NULL),
+    : BaseCPU(p), tickEvent(this, p->width), cpuXC(NULL),
       cacheCompletionEvent(this)
 {
     _status = Idle;
 #if FULL_SYSTEM
-    xc = new ExecContext(this, 0, p->system, p->itb, p->dtb, p->mem);
+    cpuXC = new CPUExecContext(this, 0, p->system, p->itb, p->dtb, p->mem);
 
 #else
-    xc = new ExecContext(this, /* thread_num */ 0, p->process, /* asid */ 0);
+    cpuXC = new CPUExecContext(this, /* thread_num */ 0, p->process,
+                               /* asid */ 0);
 #endif // !FULL_SYSTEM
+    xcProxy = cpuXC->getProxy();
 
     icacheInterface = p->icache_interface;
     dcacheInterface = p->dcache_interface;
 
     memReq = new MemReq();
-    memReq->xc = xc;
+    memReq->xc = xcProxy;
     memReq->asid = 0;
     memReq->data = new uint8_t[64];
 
@@ -158,7 +161,7 @@ SimpleCPU::SimpleCPU(Params *p)
     lastIcacheStall = 0;
     lastDcacheStall = 0;
 
-    execContexts.push_back(xc);
+    execContexts.push_back(xcProxy);
 }
 
 SimpleCPU::~SimpleCPU()
@@ -207,7 +210,7 @@ void
 SimpleCPU::activateContext(int thread_num, int delay)
 {
     assert(thread_num == 0);
-    assert(xc);
+    assert(cpuXC);
 
     assert(_status == Idle);
     notIdleFraction++;
@@ -220,7 +223,7 @@ void
 SimpleCPU::suspendContext(int thread_num)
 {
     assert(thread_num == 0);
-    assert(xc);
+    assert(cpuXC);
 
     assert(_status == Running);
     notIdleFraction--;
@@ -301,7 +304,7 @@ SimpleCPU::serialize(ostream &os)
     SERIALIZE_ENUM(_status);
     SERIALIZE_SCALAR(inst);
     nameOut(os, csprintf("%s.xc", name()));
-    xc->serialize(os);
+    cpuXC->serialize(os);
     nameOut(os, csprintf("%s.tickEvent", name()));
     tickEvent.serialize(os);
     nameOut(os, csprintf("%s.cacheCompletionEvent", name()));
@@ -314,7 +317,7 @@ SimpleCPU::unserialize(Checkpoint *cp, const string &section)
     BaseCPU::unserialize(cp, section);
     UNSERIALIZE_ENUM(_status);
     UNSERIALIZE_SCALAR(inst);
-    xc->unserialize(cp, csprintf("%s.xc", section));
+    cpuXC->unserialize(cp, csprintf("%s.xc", section));
     tickEvent.unserialize(cp, csprintf("%s.tickEvent", section));
     cacheCompletionEvent
         .unserialize(cp, csprintf("%s.cacheCompletionEvent", section));
@@ -345,16 +348,16 @@ SimpleCPU::copySrcTranslate(Addr src)
     memReq->reset(src & ~(blk_size - 1), blk_size);
 
     // translate to physical address
-    Fault fault = xc->translateDataReadReq(memReq);
+    Fault fault = cpuXC->translateDataReadReq(memReq);
 
     assert(fault != AlignmentFault);
 
     if (fault == NoFault) {
-        xc->copySrcAddr = src;
-        xc->copySrcPhysAddr = memReq->paddr + offset;
+        cpuXC->copySrcAddr = src;
+        cpuXC->copySrcPhysAddr = memReq->paddr + offset;
     } else {
-        xc->copySrcAddr = 0;
-        xc->copySrcPhysAddr = 0;
+        cpuXC->copySrcAddr = 0;
+        cpuXC->copySrcPhysAddr = 0;
     }
     return fault;
 }
@@ -367,7 +370,7 @@ SimpleCPU::copy(Addr dest)
     // Only support block sizes of 64 atm.
     assert(blk_size == 64);
     uint8_t data[blk_size];
-    //assert(xc->copySrcAddr);
+    //assert(cpuXC->copySrcAddr);
     int offset = dest & (blk_size - 1);
 
     // Make sure block doesn't span page
@@ -380,21 +383,21 @@ SimpleCPU::copy(Addr dest)
 
     memReq->reset(dest & ~(blk_size -1), blk_size);
     // translate to physical address
-    Fault fault = xc->translateDataWriteReq(memReq);
+    Fault fault = cpuXC->translateDataWriteReq(memReq);
 
     assert(fault != AlignmentFault);
 
     if (fault == NoFault) {
         Addr dest_addr = memReq->paddr + offset;
         // Need to read straight from memory since we have more than 8 bytes.
-        memReq->paddr = xc->copySrcPhysAddr;
-        xc->mem->read(memReq, data);
+        memReq->paddr = cpuXC->copySrcPhysAddr;
+        cpuXC->mem->read(memReq, data);
         memReq->paddr = dest_addr;
-        xc->mem->write(memReq, data);
+        cpuXC->mem->write(memReq, data);
         if (dcacheInterface) {
             memReq->cmd = Copy;
             memReq->completionEvent = NULL;
-            memReq->paddr = xc->copySrcPhysAddr;
+            memReq->paddr = cpuXC->copySrcPhysAddr;
             memReq->dest = dest_addr;
             memReq->size = 64;
             memReq->time = curTick;
@@ -411,7 +414,7 @@ Fault
 SimpleCPU::read(Addr addr, T &data, unsigned flags)
 {
     if (status() == DcacheMissStall || status() == DcacheMissSwitch) {
-        Fault fault = xc->read(memReq,data);
+        Fault fault = cpuXC->read(memReq,data);
 
         if (traceData) {
             traceData->setAddr(addr);
@@ -422,7 +425,7 @@ SimpleCPU::read(Addr addr, T &data, unsigned flags)
     memReq->reset(addr, sizeof(T), flags);
 
     // translate to physical address
-    Fault fault = xc->translateDataReadReq(memReq);
+    Fault fault = cpuXC->translateDataReadReq(memReq);
 
     // if we have a cache, do cache access too
     if (fault == NoFault && dcacheInterface) {
@@ -442,12 +445,12 @@ SimpleCPU::read(Addr addr, T &data, unsigned flags)
             _status = DcacheMissStall;
         } else {
             // do functional access
-            fault = xc->read(memReq, data);
+            fault = cpuXC->read(memReq, data);
 
         }
     } else if(fault == NoFault) {
         // do functional access
-        fault = xc->read(memReq, data);
+        fault = cpuXC->read(memReq, data);
 
     }
 
@@ -507,11 +510,11 @@ SimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
     memReq->reset(addr, sizeof(T), flags);
 
     // translate to physical address
-    Fault fault = xc->translateDataWriteReq(memReq);
+    Fault fault = cpuXC->translateDataWriteReq(memReq);
 
     // do functional access
     if (fault == NoFault)
-        fault = xc->write(memReq, data);
+        fault = cpuXC->write(memReq, data);
 
     if (fault == NoFault && dcacheInterface) {
         memReq->cmd = Write;
@@ -588,7 +591,7 @@ SimpleCPU::write(int32_t data, Addr addr, unsigned flags, uint64_t *res)
 Addr
 SimpleCPU::dbg_vtophys(Addr addr)
 {
-    return vtophys(xc, addr);
+    return vtophys(xcProxy, addr);
 }
 #endif // FULL_SYSTEM
 
@@ -636,9 +639,9 @@ SimpleCPU::post_interrupt(int int_num, int index)
 {
     BaseCPU::post_interrupt(int_num, index);
 
-    if (xc->status() == ExecContext::Suspended) {
+    if (cpuXC->status() == ExecContext::Suspended) {
                 DPRINTF(IPI,"Suspended Processor awoke\n");
-        xc->activate();
+        cpuXC->activate();
     }
 }
 #endif // FULL_SYSTEM
@@ -654,16 +657,16 @@ SimpleCPU::tick()
     Fault fault = NoFault;
 
 #if FULL_SYSTEM
-    if (checkInterrupts && check_interrupts() && !xc->inPalMode() &&
+    if (checkInterrupts && check_interrupts() && !cpuXC->inPalMode() &&
         status() != IcacheMissComplete) {
         int ipl = 0;
         int summary = 0;
         checkInterrupts = false;
 
-        if (xc->readMiscReg(IPR_SIRR)) {
+        if (cpuXC->readMiscReg(IPR_SIRR)) {
             for (int i = INTLEVEL_SOFTWARE_MIN;
                  i < INTLEVEL_SOFTWARE_MAX; i++) {
-                if (xc->readMiscReg(IPR_SIRR) & (ULL(1) << i)) {
+                if (cpuXC->readMiscReg(IPR_SIRR) & (ULL(1) << i)) {
                     // See table 4-19 of 21164 hardware reference
                     ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1;
                     summary |= (ULL(1) << i);
@@ -671,7 +674,7 @@ SimpleCPU::tick()
             }
         }
 
-        uint64_t interrupts = xc->cpu->intr_status();
+        uint64_t interrupts = cpuXC->cpu->intr_status();
         for (int i = INTLEVEL_EXTERNAL_MIN;
             i < INTLEVEL_EXTERNAL_MAX; i++) {
             if (interrupts & (ULL(1) << i)) {
@@ -681,24 +684,24 @@ SimpleCPU::tick()
             }
         }
 
-        if (xc->readMiscReg(IPR_ASTRR))
+        if (cpuXC->readMiscReg(IPR_ASTRR))
             panic("asynchronous traps not implemented\n");
 
-        if (ipl && ipl > xc->readMiscReg(IPR_IPLR)) {
-            xc->setMiscReg(IPR_ISR, summary);
-            xc->setMiscReg(IPR_INTID, ipl);
-            xc->ev5_trap(InterruptFault);
+        if (ipl && ipl > cpuXC->readMiscReg(IPR_IPLR)) {
+            cpuXC->setMiscReg(IPR_ISR, summary);
+            cpuXC->setMiscReg(IPR_INTID, ipl);
+            cpuXC->ev5_trap(InterruptFault);
 
             DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n",
-                    xc->readMiscReg(IPR_IPLR), ipl, summary);
+                    cpuXC->readMiscReg(IPR_IPLR), ipl, summary);
         }
     }
 #endif
 
     // maintain $r0 semantics
-    xc->regs.intRegFile[ZeroReg] = 0;
+    cpuXC->setIntReg(ZeroReg, 0);
 #ifdef TARGET_ALPHA
-    xc->regs.floatRegFile.d[ZeroReg] = 0.0;
+    cpuXC->setFloatRegDouble(ZeroReg, 0.0);
 #endif // TARGET_ALPHA
 
     if (status() == IcacheMissComplete) {
@@ -720,13 +723,13 @@ SimpleCPU::tick()
 #endif
 
         memReq->cmd = Read;
-        memReq->reset(xc->regs.pc & ~3, sizeof(uint32_t),
-                     IFETCH_FLAGS(xc->regs.pc));
+        memReq->reset(cpuXC->readPC() & ~3, sizeof(uint32_t),
+                     IFETCH_FLAGS(cpuXC->readPC()));
 
-        fault = xc->translateInstReq(memReq);
+        fault = cpuXC->translateInstReq(memReq);
 
         if (fault == NoFault)
-            fault = xc->mem->read(memReq, inst);
+            fault = cpuXC->mem->read(memReq, inst);
 
         if (icacheInterface && fault == NoFault) {
             memReq->completionEvent = NULL;
@@ -763,29 +766,30 @@ SimpleCPU::tick()
         inst = gtoh(inst);
         curStaticInst = StaticInst::decode(inst);
 
-        traceData = Trace::getInstRecord(curTick, xc, this, curStaticInst,
-                                         xc->regs.pc);
+        traceData = Trace::getInstRecord(curTick, xcProxy, this, curStaticInst,
+                                         cpuXC->readPC());
 
 #if FULL_SYSTEM
-        xc->setInst(inst);
+        cpuXC->setInst(inst);
 #endif // FULL_SYSTEM
 
-        xc->func_exe_inst++;
+        cpuXC->func_exe_inst++;
 
         fault = curStaticInst->execute(this, traceData);
 
 #if FULL_SYSTEM
-        if (xc->fnbin) {
-            assert(xc->kernelStats);
-            system->kernelBinning->execute(xc, inst);
+        if (system->kernelBinning->fnbin) {
+            assert(kernelStats);
+            system->kernelBinning->execute(xcProxy, inst);
         }
 
-        if (xc->profile) {
-            bool usermode = (xc->readMiscReg(AlphaISA::IPR_DTB_CM) & 0x18) != 0;
-            xc->profilePC = usermode ? 1 : xc->regs.pc;
-            ProfileNode *node = xc->profile->consume(xc, inst);
+        if (cpuXC->profile) {
+            bool usermode =
+                (cpuXC->readMiscReg(AlphaISA::IPR_DTB_CM) & 0x18) != 0;
+            cpuXC->profilePC = usermode ? 1 : cpuXC->readPC();
+            ProfileNode *node = cpuXC->profile->consume(xcProxy, inst);
             if (node)
-                xc->profileNode = node;
+                cpuXC->profileNode = node;
         }
 #endif
 
@@ -805,29 +809,29 @@ SimpleCPU::tick()
             traceData->finalize();
         }
 
-        traceFunctions(xc->regs.pc);
+        traceFunctions(cpuXC->readPC());
 
     }	// if (fault == NoFault)
 
     if (fault != NoFault) {
 #if FULL_SYSTEM
-        xc->ev5_trap(fault);
+        cpuXC->ev5_trap(fault);
 #else // !FULL_SYSTEM
-        fatal("fault (%d) detected @ PC 0x%08p", fault, xc->regs.pc);
+        fatal("fault (%d) detected @ PC 0x%08p", fault, cpuXC->readPC());
 #endif // FULL_SYSTEM
     }
     else {
         // go to the next instruction
-        xc->regs.pc = xc->regs.npc;
-        xc->regs.npc += sizeof(MachInst);
+        cpuXC->setPC(cpuXC->readNextPC());
+        cpuXC->setNextPC(cpuXC->readNextPC() + sizeof(MachInst));
     }
 
 #if FULL_SYSTEM
     Addr oldpc;
     do {
-        oldpc = xc->regs.pc;
-        system->pcEventQueue.service(xc);
-    } while (oldpc != xc->regs.pc);
+        oldpc = cpuXC->readPC();
+        system->pcEventQueue.service(xcProxy);
+    } while (oldpc != cpuXC->readPC());
 #endif
 
     assert(status() == Running ||
diff --git a/cpu/simple/cpu.hh b/cpu/simple/cpu.hh
index 3bc905be1..1441a8fcd 100644
--- a/cpu/simple/cpu.hh
+++ b/cpu/simple/cpu.hh
@@ -32,7 +32,7 @@
 #include "base/statistics.hh"
 #include "config/full_system.hh"
 #include "cpu/base.hh"
-#include "cpu/exec_context.hh"
+#include "cpu/cpu_exec_context.hh"
 #include "cpu/pc_event.hh"
 #include "cpu/sampler/sampler.hh"
 #include "cpu/static_inst.hh"
@@ -54,6 +54,7 @@ class Process;
 
 #endif // FULL_SYSTEM
 
+class ExecContext;
 class MemInterface;
 class Checkpoint;
 
@@ -148,7 +149,9 @@ class SimpleCPU : public BaseCPU
 
   public:
     // execution context
-    ExecContext *xc;
+    CPUExecContext *cpuXC;
+
+    ExecContext *xcProxy;
 
     void switchOut(Sampler *s);
     void takeOverFrom(BaseCPU *oldCPU);
@@ -275,86 +278,86 @@ class SimpleCPU : public BaseCPU
 
     uint64_t readIntReg(const StaticInst *si, int idx)
     {
-        return xc->readIntReg(si->srcRegIdx(idx));
+        return cpuXC->readIntReg(si->srcRegIdx(idx));
     }
 
     float readFloatRegSingle(const StaticInst *si, int idx)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return xc->readFloatRegSingle(reg_idx);
+        return cpuXC->readFloatRegSingle(reg_idx);
     }
 
     double readFloatRegDouble(const StaticInst *si, int idx)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return xc->readFloatRegDouble(reg_idx);
+        return cpuXC->readFloatRegDouble(reg_idx);
     }
 
     uint64_t readFloatRegInt(const StaticInst *si, int idx)
     {
         int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
-        return xc->readFloatRegInt(reg_idx);
+        return cpuXC->readFloatRegInt(reg_idx);
     }
 
     void setIntReg(const StaticInst *si, int idx, uint64_t val)
     {
-        xc->setIntReg(si->destRegIdx(idx), val);
+        cpuXC->setIntReg(si->destRegIdx(idx), val);
     }
 
     void setFloatRegSingle(const StaticInst *si, int idx, float val)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        xc->setFloatRegSingle(reg_idx, val);
+        cpuXC->setFloatRegSingle(reg_idx, val);
     }
 
     void setFloatRegDouble(const StaticInst *si, int idx, double val)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        xc->setFloatRegDouble(reg_idx, val);
+        cpuXC->setFloatRegDouble(reg_idx, val);
     }
 
     void setFloatRegInt(const StaticInst *si, int idx, uint64_t val)
     {
         int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
-        xc->setFloatRegInt(reg_idx, val);
+        cpuXC->setFloatRegInt(reg_idx, val);
     }
 
-    uint64_t readPC() { return xc->readPC(); }
-    void setNextPC(uint64_t val) { xc->setNextPC(val); }
+    uint64_t readPC() { return cpuXC->readPC(); }
+    void setNextPC(uint64_t val) { cpuXC->setNextPC(val); }
 
     MiscReg readMiscReg(int misc_reg)
     {
-        return xc->readMiscReg(misc_reg);
+        return cpuXC->readMiscReg(misc_reg);
     }
 
     MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault)
     {
-        return xc->readMiscRegWithEffect(misc_reg, fault);
+        return cpuXC->readMiscRegWithEffect(misc_reg, fault);
     }
 
     Fault setMiscReg(int misc_reg, const MiscReg &val)
     {
-        return xc->setMiscReg(misc_reg, val);
+        return cpuXC->setMiscReg(misc_reg, val);
     }
 
     Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val)
     {
-        return xc->setMiscRegWithEffect(misc_reg, val);
+        return cpuXC->setMiscRegWithEffect(misc_reg, val);
     }
 
 #if FULL_SYSTEM
-    Fault hwrei() { return xc->hwrei(); }
-    int readIntrFlag() { return xc->readIntrFlag(); }
-    void setIntrFlag(int val) { xc->setIntrFlag(val); }
-    bool inPalMode() { return xc->inPalMode(); }
-    void ev5_trap(Fault fault) { xc->ev5_trap(fault); }
-    bool simPalCheck(int palFunc) { return xc->simPalCheck(palFunc); }
+    Fault hwrei() { return cpuXC->hwrei(); }
+    int readIntrFlag() { return cpuXC->readIntrFlag(); }
+    void setIntrFlag(int val) { cpuXC->setIntrFlag(val); }
+    bool inPalMode() { return cpuXC->inPalMode(); }
+    void ev5_trap(Fault fault) { cpuXC->ev5_trap(fault); }
+    bool simPalCheck(int palFunc) { return cpuXC->simPalCheck(palFunc); }
 #else
-    void syscall() { xc->syscall(); }
+    void syscall() { cpuXC->syscall(); }
 #endif
 
-    bool misspeculating() { return xc->misspeculating(); }
-    ExecContext *xcBase() { return xc; }
+    bool misspeculating() { return cpuXC->misspeculating(); }
+    ExecContext *xcBase() { return xcProxy; }
 };
 
 #endif // __CPU_SIMPLE_CPU_SIMPLE_CPU_HH__