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/*
* Copyright (c) 2003 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.
*/
#include <string>
#include "cpu/base_cpu.hh"
#include "cpu/exec_context.hh"
#ifdef FULL_SYSTEM
#include "sim/system.hh"
#else
#include "sim/process.hh"
#endif
using namespace std;
// constructor
#ifdef FULL_SYSTEM
ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
AlphaItb *_itb, AlphaDtb *_dtb,
FunctionalMemory *_mem)
: _status(ExecContext::Unallocated),
kernelStats(this, _cpu), cpu(_cpu), thread_num(_thread_num),
cpu_id(-1), mem(_mem), itb(_itb), dtb(_dtb), system(_sys),
memCtrl(_sys->memCtrl), physmem(_sys->physmem),
swCtx(NULL), func_exe_inst(0), storeCondFailures(0)
{
memset(®s, 0, sizeof(RegFile));
}
#else
ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
Process *_process, int _asid)
: _status(ExecContext::Unallocated),
cpu(_cpu), thread_num(_thread_num), cpu_id(-1),
process(_process), mem(process->getMemory()), asid(_asid),
func_exe_inst(0), storeCondFailures(0)
{
}
ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
FunctionalMemory *_mem, int _asid)
: cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
func_exe_inst(0), storeCondFailures(0)
{
}
#endif
void
ExecContext::takeOverFrom(ExecContext *oldContext)
{
// some things should already be set up
assert(mem == oldContext->mem);
#ifdef FULL_SYSTEM
assert(system == oldContext->system);
#else
assert(process == oldContext->process);
#endif
// copy over functional state
_status = oldContext->_status;
#ifdef FULL_SYSTEM
kernelStats = oldContext->kernelStats;
#endif
regs = oldContext->regs;
cpu_id = oldContext->cpu_id;
func_exe_inst = oldContext->func_exe_inst;
storeCondFailures = 0;
oldContext->_status = ExecContext::Unallocated;
}
void
ExecContext::serialize(ostream &os)
{
SERIALIZE_ENUM(_status);
regs.serialize(os);
// thread_num and cpu_id are deterministic from the config
SERIALIZE_SCALAR(func_exe_inst);
bool ctx = false;
if (swCtx) {
ctx = true;
SERIALIZE_SCALAR(ctx);
SERIALIZE_SCALAR(swCtx->calls);
std::stack<fnCall *> *stack = &(swCtx->callStack);
fnCall *top;
int size = stack->size();
SERIALIZE_SCALAR(size);
for (int j=0; j<size; ++j) {
top = stack->top();
paramOut(os, csprintf("stackpos[%d]",j), top->name);
}
} else {
SERIALIZE_SCALAR(ctx);
}
if (system->bin) {
Statistics::MainBin *cur = Statistics::MainBin::curBin();
string bin_name = cur->name();
SERIALIZE_SCALAR(bin_name);
}
}
void
ExecContext::unserialize(Checkpoint *cp, const std::string §ion)
{
UNSERIALIZE_ENUM(_status);
regs.unserialize(cp, section);
// thread_num and cpu_id are deterministic from the config
UNSERIALIZE_SCALAR(func_exe_inst);
bool ctx;
UNSERIALIZE_SCALAR(ctx);
if (ctx) {
swCtx = new SWContext;
UNSERIALIZE_SCALAR(swCtx->calls);
int size;
UNSERIALIZE_SCALAR(size);
fnCall *call = new fnCall[size];
for (int i=0; i<size; ++i) {
paramIn(cp, section, csprintf("stackpos[%d]",i), call[i].name);
call[i].myBin = system->getBin(call[i].name);
}
for (int i=size-1; i>=0; --i) {
swCtx->callStack.push(&(call[i]));
}
}
if (system->bin) {
string bin_name;
UNSERIALIZE_SCALAR(bin_name);
system->getBin(bin_name)->activate();
}
}
void
ExecContext::activate(int delay)
{
if (status() == Active)
return;
_status = Active;
cpu->activateContext(thread_num, delay);
}
void
ExecContext::suspend()
{
if (status() == Suspended)
return;
#ifdef FULL_SYSTEM
// Don't change the status from active if there are pending interrupts
if (cpu->check_interrupts()) {
assert(status() == Active);
return;
}
#endif
_status = Suspended;
cpu->suspendContext(thread_num);
}
void
ExecContext::deallocate()
{
if (status() == Unallocated)
return;
_status = Unallocated;
cpu->deallocateContext(thread_num);
}
void
ExecContext::halt()
{
if (status() == Halted)
return;
_status = Halted;
cpu->haltContext(thread_num);
}
void
ExecContext::regStats(const string &name)
{
#ifdef FULL_SYSTEM
kernelStats.regStats(name + ".kern");
#endif
}
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