Hello,
I am using SE mode in gem5 and trying to implement the concept of processing in
memory. I have added a TimingSimpleCPU in the memory configuration and trying
to make it takeover all the contents of the host processor to be operated in
the memory instead of the host CPU.
I found out that I must include takeOverFrom(), haltContext() and
activateContext() in the host processor constructor code.
So far I have the below constructed function for implementation (in
Out-of-order CPU constructor file as a host CPU), but I am getting a
segmentation fault.
template <class Impl>
void
FullO3CPU<Impl>::PIMProcess(ThreadContext *tc, int pim_id){
BaseCPU* pim_cpu =(BaseCPU*)SimObject::find("system.pim_cpu");
this->haltContext(tc->contextId());
pim_cpu->takeOverFrom(this);
pim_cpu->host_id=this->_cpuId;
pim_cpu->activateContext(0);
}
**** REAL SIMULATION ****
info: Entering event queue @ 0. Starting simulation...
info: Increasing stack size by one page.
warn: ignoring syscall access(...)
takeOverFrom-1
warn: ClockedObject: Already in the requested power state, request ignored
gem5 has encountered a segmentation fault!
--- BEGIN LIBC BACKTRACE ---
build/X86/gem5.opt(_Z15print_backtracev+0x15)[0xfef065]
build/X86/gem5.opt[0xffca7d]
/lib64/libpthread.so.0(+0xf630)[0x7fd9459b6630]
build/X86/gem5.opt(_ZN15TimingSimpleCPU16handleReadPacketEP6Packet+0x157)[0x11350a7]
build/X86/gem5.opt(_ZN15TimingSimpleCPU17finishTranslationEP21WholeTranslationState+0x248)[0x11391a8]
build/X86/gem5.opt(_ZN15DataTranslationIP15TimingSimpleCPUE6finishERKSt10shared_ptrI9FaultBaseERKS3_I7RequestEP13ThreadContextN7BaseTLB4ModeE+0x110)[0x11413a0]
build/X86/gem5.opt(_ZN6X86ISA3TLB15translateTimingERKSt10shared_ptrI7RequestEP13ThreadContextPN7BaseTLB11TranslationENS8_4ModeE+0xaf)[0x9b3b7f]
build/X86/gem5.opt(_ZN15TimingSimpleCPU15initiateMemReadEmj5FlagsImE+0x518)[0x1137098]
build/X86/gem5.opt(_ZN17SimpleExecContext15initiateMemReadEmj5FlagsImE+0x11)[0x1141581]
build/X86/gem5.opt(_ZNK10X86ISAInst7LdisBig11initiateAccEP11ExecContextPN5Trace10InstRecordE+0xc1)[0xd50631]
build/X86/gem5.opt(_ZN15TimingSimpleCPU14completeIfetchEP6Packet+0x373)[0x1137cb3]
build/X86/gem5.opt(_ZN10EventQueue10serviceOneEv+0x125)[0xff6425]
build/X86/gem5.opt(_Z9doSimLoopP10EventQueue+0xf8)[0x10088e8]
build/X86/gem5.opt(_Z8simulatem+0x966)[0x10094d6]
build/X86/gem5.opt[0x940dba]
build/X86/gem5.opt[0x920e55]
/lib64/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x730a)[0x7fd9452b981a]
/lib64/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7ed)[0x7fd9452bb64d]
/lib64/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x663c)[0x7fd9452b8b4c]
/lib64/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7ed)[0x7fd9452bb64d]
/lib64/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x663c)[0x7fd9452b8b4c]
/lib64/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7ed)[0x7fd9452bb64d]
/lib64/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x663c)[0x7fd9452b8b4c]
/lib64/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7ed)[0x7fd9452bb64d]
/lib64/libpython2.7.so.1.0(PyEval_EvalCode+0x32)[0x7fd9452bb752]
/lib64/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5513)[0x7fd9452b7a23]
/lib64/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7ed)[0x7fd9452bb64d]
/lib64/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x663c)[0x7fd9452b8b4c]
/lib64/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7ed)[0x7fd9452bb64d]
/lib64/libpython2.7.so.1.0(PyEval_EvalCode+0x32)[0x7fd9452bb752]
/lib64/libpython2.7.so.1.0(+0x100b8f)[0x7fd9452d4b8f]
/lib64/libpython2.7.so.1.0(PyRun_StringFlags+0x65)[0x7fd9452d5a05]
--- END LIBC BACKTRACE ---
Anyone can help me with this please?
Thank you,
Hessa.
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