gem5/cpu/base.cc
Nathan Binkert 0dcb288365 Cleanup the StackTrace interfaces and profile interfaces so they
are more efficient and reduce the number of new/delete calls

arch/alpha/stacktrace.cc:
    - Change the StackTrace code so that the class can more easily be
    cleaned out and reused to avoid extra allocations.
    - Allow trace() to accept a static instruction pointer so it can
    determine if the instruction is worth tracing.  This is moved from
    the CPU.
    - provide constants for special meaning PCs (user, console, unknown),
    instead of magic numbers
    - switch to using kernelSymtab instead of allSymtab which will be
    going away
    - if the stack adjustment doesn't make any sense, exit and push
    unknown so we don't get into an infinite loop or record garbage.
    - check to see if we've made too many iterations through the stack
    and panic to avoid an infinite loop
arch/alpha/stacktrace.hh:
    - Change the StackTrace code so that the class can more easily be
    cleaned out and reused to avoid extra allocations.
    - Allow trace() to accept a static instruction pointer so it can
    determine if the instruction is worth tracing.  This is moved from
    the CPU.
    - provide constants for special meaning PCs (user, console, unknown),
    instead of magic numbers
cpu/base.cc:
    only clear the profile if we have one
    include profile.hh here since base.hh doesn't do it anymore
cpu/base.hh:
    no need to include cpu/profile.hh here
cpu/profile.cc:
    use ProfileNode pointers instead of objects in the ChildList
    Consume a vector of addresses since that's really all we
    care about.
cpu/profile.hh:
    Keep pointers to ProfileNodes to reduce the size of these structures
    keep a StackTrace around so that we may reuse it.
    provide consume functions that use the new StackTrace trace interface
    one consume function is inline and tries to fastpath the no trace
    condition, it calls the outlined consume function if a trace is generated.
cpu/simple/cpu.cc:
    include cpu/profile.hh here since base.hh no longer does
    use the new FunctionProfile::consume interface
    (which contains the tracing functions)

--HG--
extra : convert_revision : 5a1d9265289a75f67a497b322926be1f8c2d8eb3
2005-11-20 17:44:58 -05:00

369 lines
10 KiB
C++

/*
* 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.
*/
#include <iostream>
#include <string>
#include <sstream>
#include "base/cprintf.hh"
#include "base/loader/symtab.hh"
#include "base/misc.hh"
#include "base/output.hh"
#include "cpu/base.hh"
#include "cpu/exec_context.hh"
#include "cpu/profile.hh"
#include "cpu/sampler/sampler.hh"
#include "sim/param.hh"
#include "sim/sim_events.hh"
#include "base/trace.hh"
using namespace std;
vector<BaseCPU *> BaseCPU::cpuList;
// This variable reflects the max number of threads in any CPU. Be
// careful to only use it once all the CPUs that you care about have
// been initialized
int maxThreadsPerCPU = 1;
#if FULL_SYSTEM
BaseCPU::BaseCPU(Params *p)
: SimObject(p->name), clock(p->clock), checkInterrupts(true),
params(p), number_of_threads(p->numberOfThreads), system(p->system)
#else
BaseCPU::BaseCPU(Params *p)
: SimObject(p->name), clock(p->clock), params(p),
number_of_threads(p->numberOfThreads)
#endif
{
DPRINTF(FullCPU, "BaseCPU: Creating object, mem address %#x.\n", this);
// add self to global list of CPUs
cpuList.push_back(this);
DPRINTF(FullCPU, "BaseCPU: CPU added to cpuList, mem address %#x.\n",
this);
if (number_of_threads > maxThreadsPerCPU)
maxThreadsPerCPU = number_of_threads;
// allocate per-thread instruction-based event queues
comInstEventQueue = new EventQueue *[number_of_threads];
for (int i = 0; i < number_of_threads; ++i)
comInstEventQueue[i] = new EventQueue("instruction-based event queue");
//
// set up instruction-count-based termination events, if any
//
if (p->max_insts_any_thread != 0)
for (int i = 0; i < number_of_threads; ++i)
new SimExitEvent(comInstEventQueue[i], p->max_insts_any_thread,
"a thread reached the max instruction count");
if (p->max_insts_all_threads != 0) {
// allocate & initialize shared downcounter: each event will
// decrement this when triggered; simulation will terminate
// when counter reaches 0
int *counter = new int;
*counter = number_of_threads;
for (int i = 0; i < number_of_threads; ++i)
new CountedExitEvent(comInstEventQueue[i],
"all threads reached the max instruction count",
p->max_insts_all_threads, *counter);
}
// allocate per-thread load-based event queues
comLoadEventQueue = new EventQueue *[number_of_threads];
for (int i = 0; i < number_of_threads; ++i)
comLoadEventQueue[i] = new EventQueue("load-based event queue");
//
// set up instruction-count-based termination events, if any
//
if (p->max_loads_any_thread != 0)
for (int i = 0; i < number_of_threads; ++i)
new SimExitEvent(comLoadEventQueue[i], p->max_loads_any_thread,
"a thread reached the max load count");
if (p->max_loads_all_threads != 0) {
// allocate & initialize shared downcounter: each event will
// decrement this when triggered; simulation will terminate
// when counter reaches 0
int *counter = new int;
*counter = number_of_threads;
for (int i = 0; i < number_of_threads; ++i)
new CountedExitEvent(comLoadEventQueue[i],
"all threads reached the max load count",
p->max_loads_all_threads, *counter);
}
#if FULL_SYSTEM
memset(interrupts, 0, sizeof(interrupts));
intstatus = 0;
#endif
functionTracingEnabled = false;
if (p->functionTrace) {
functionTraceStream = simout.find(csprintf("ftrace.%s", name()));
currentFunctionStart = currentFunctionEnd = 0;
functionEntryTick = p->functionTraceStart;
if (p->functionTraceStart == 0) {
functionTracingEnabled = true;
} else {
Event *e =
new EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace>(this,
true);
e->schedule(p->functionTraceStart);
}
}
#if FULL_SYSTEM
profileEvent = NULL;
if (params->profile)
profileEvent = new ProfileEvent(this, params->profile);
#endif
}
BaseCPU::Params::Params()
{
#if FULL_SYSTEM
profile = false;
#endif
}
void
BaseCPU::enableFunctionTrace()
{
functionTracingEnabled = true;
}
BaseCPU::~BaseCPU()
{
}
void
BaseCPU::init()
{
if (!params->deferRegistration)
registerExecContexts();
}
void
BaseCPU::startup()
{
#if FULL_SYSTEM
if (!params->deferRegistration && profileEvent)
profileEvent->schedule(curTick);
#endif
}
void
BaseCPU::regStats()
{
using namespace Stats;
numCycles
.name(name() + ".numCycles")
.desc("number of cpu cycles simulated")
;
int size = execContexts.size();
if (size > 1) {
for (int i = 0; i < size; ++i) {
stringstream namestr;
ccprintf(namestr, "%s.ctx%d", name(), i);
execContexts[i]->regStats(namestr.str());
}
} else if (size == 1)
execContexts[0]->regStats(name());
}
void
BaseCPU::registerExecContexts()
{
for (int i = 0; i < execContexts.size(); ++i) {
ExecContext *xc = execContexts[i];
#if FULL_SYSTEM
int id = params->cpu_id;
if (id != -1)
id += i;
xc->cpu_id = system->registerExecContext(xc, id);
#else
xc->cpu_id = xc->process->registerExecContext(xc);
#endif
}
}
void
BaseCPU::switchOut(Sampler *sampler)
{
panic("This CPU doesn't support sampling!");
}
void
BaseCPU::takeOverFrom(BaseCPU *oldCPU)
{
assert(execContexts.size() == oldCPU->execContexts.size());
for (int i = 0; i < execContexts.size(); ++i) {
ExecContext *newXC = execContexts[i];
ExecContext *oldXC = oldCPU->execContexts[i];
newXC->takeOverFrom(oldXC);
assert(newXC->cpu_id == oldXC->cpu_id);
#if FULL_SYSTEM
system->replaceExecContext(newXC, newXC->cpu_id);
#else
assert(newXC->process == oldXC->process);
newXC->process->replaceExecContext(newXC, newXC->cpu_id);
#endif
}
#if FULL_SYSTEM
for (int i = 0; i < NumInterruptLevels; ++i)
interrupts[i] = oldCPU->interrupts[i];
intstatus = oldCPU->intstatus;
for (int i = 0; i < execContexts.size(); ++i)
if (execContexts[i]->profile)
execContexts[i]->profile->clear();
if (profileEvent)
profileEvent->schedule(curTick);
#endif
}
#if FULL_SYSTEM
BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, int _interval)
: Event(&mainEventQueue), cpu(_cpu), interval(_interval)
{ }
void
BaseCPU::ProfileEvent::process()
{
for (int i = 0, size = cpu->execContexts.size(); i < size; ++i) {
ExecContext *xc = cpu->execContexts[i];
xc->profile->sample(xc->profileNode, xc->profilePC);
}
schedule(curTick + interval);
}
void
BaseCPU::post_interrupt(int int_num, int index)
{
DPRINTF(Interrupt, "Interrupt %d:%d posted\n", int_num, index);
if (int_num < 0 || int_num >= NumInterruptLevels)
panic("int_num out of bounds\n");
if (index < 0 || index >= sizeof(uint64_t) * 8)
panic("int_num out of bounds\n");
checkInterrupts = true;
interrupts[int_num] |= 1 << index;
intstatus |= (ULL(1) << int_num);
}
void
BaseCPU::clear_interrupt(int int_num, int index)
{
DPRINTF(Interrupt, "Interrupt %d:%d cleared\n", int_num, index);
if (int_num < 0 || int_num >= NumInterruptLevels)
panic("int_num out of bounds\n");
if (index < 0 || index >= sizeof(uint64_t) * 8)
panic("int_num out of bounds\n");
interrupts[int_num] &= ~(1 << index);
if (interrupts[int_num] == 0)
intstatus &= ~(ULL(1) << int_num);
}
void
BaseCPU::clear_interrupts()
{
DPRINTF(Interrupt, "Interrupts all cleared\n");
memset(interrupts, 0, sizeof(interrupts));
intstatus = 0;
}
void
BaseCPU::serialize(std::ostream &os)
{
SERIALIZE_ARRAY(interrupts, NumInterruptLevels);
SERIALIZE_SCALAR(intstatus);
}
void
BaseCPU::unserialize(Checkpoint *cp, const std::string &section)
{
UNSERIALIZE_ARRAY(interrupts, NumInterruptLevels);
UNSERIALIZE_SCALAR(intstatus);
}
#endif // FULL_SYSTEM
void
BaseCPU::traceFunctionsInternal(Addr pc)
{
if (!debugSymbolTable)
return;
// if pc enters different function, print new function symbol and
// update saved range. Otherwise do nothing.
if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
string sym_str;
bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
currentFunctionStart,
currentFunctionEnd);
if (!found) {
// no symbol found: use addr as label
sym_str = csprintf("0x%x", pc);
currentFunctionStart = pc;
currentFunctionEnd = pc + 1;
}
ccprintf(*functionTraceStream, " (%d)\n%d: %s",
curTick - functionEntryTick, curTick, sym_str);
functionEntryTick = curTick;
}
}
DEFINE_SIM_OBJECT_CLASS_NAME("BaseCPU", BaseCPU)