[gem5-users] What happens when a atomic only port is accessed in Timing simulation?

[Zehan Gao]

Hi All,
  I am building a simulated system with a control registers port 
that only implemented recvAtomic function. The control port is connected to the 
IOBridge, and the system is running in timing mode. There is no problem to 
access the registers from CPU, but I wonder what the system does with the 
delay? I believe the atomic port would be treated as a timing port that has no 
delays. But is the delay of IOBridge and other system buses counted?

Thanks,
Zehan

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[gem5-users] Resetting and dumping stats in Gem5

[VIPIN PATEL]

Hi All,

I want to reset the gem5 stats before the start of ROI (region of interest)
and dump the stats as soon as the ROI completes.
I looked into a few old mail archives, but was unable to locate m5op.h
header for resetting and dumping the stats.

Could anyone guide me through the correct way to do this in SE mode?

I am using gem5 v20.

Regards,
Vipin
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[gem5-users] Re: Segmentation Fault when trying to execute mrs x0, mpidr_el1

[Richard Cooper]

Hi Siva,

An SE simulation implicitly runs at EL0, and reading MPIDR_EL1 is undefined at 
EL0 (unless FEAT_IDST is implemented, which is not currently the case in gem5).
It looks like gem5 is segfaulting instead of failing more gracefully in this 
case, but in general you won’t be able to read MPIDR_EL1 from SE mode.
You would probably need to run a baremetal simulation to use MPIDR_EL1, and 
make the access from EL1 or above.

Best regards,

Richard.


From: siva sankar 
Sent: 01 July 2022 21:02
To: gem5 users mailing list 
Subject: [gem5-users] Segmentation Fault when trying to execute mrs x0, 
mpidr_el1

Hi All,

I am trying to run an executable in gem5 where the first instruction is "mrs 
x0, mpidr_el1". As soon as I run it, it fails with the following segmentation 
fault.

Below is the command and the error message:

./build/ARM/gem5.opt configs/example/se.py --cmd=temp.elf
 REAL SIMULATION 
build/ARM/sim/simulate.cc:194: info: Entering event queue @ 0.  Starting 
simulation...
build/ARM/arch/arm/utility.cc:154: warn: Trying to read MPIDR at EL0
gem5 has encountered a segmentation fault!

--- BEGIN LIBC BACKTRACE ---
./build/ARM/gem5.opt[0x1bdbc75]
./build/ARM/gem5.opt[0x1bf677d]
/lib64/libpthread.so.0(+0xf7e0)[0x776417e0]
./build/ARM/gem5.opt[0x77d4a7]
./build/ARM/gem5.opt[0x77ddf5]
./build/ARM/gem5.opt[0x63b6be]
./build/ARM/gem5.opt[0xe81cc8]
./build/ARM/gem5.opt[0x1602fe4]
./build/ARM/gem5.opt[0x1be7268]
./build/ARM/gem5.opt[0x1c0f859]
./build/ARM/gem5.opt[0x1c104ba]
./build/ARM/gem5.opt[0x1bcba40]
./build/ARM/gem5.opt[0x166a9a1]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(PyCFunction_Call+0x118)[0x778f1b48]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x84f5)[0x778c81f5]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalCodeWithName+0xa7a)[0x779dd08a]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyFunction_Vectorcall+0xa8)[0x778ef748]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x8037)[0x778c7d37]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(+0x6fae0)[0x778beae0]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x604a)[0x778c5d4a]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalCodeWithName+0xa7a)[0x779dd08a]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyFunction_Vectorcall+0xa8)[0x778ef748]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x8037)[0x778c7d37]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalCodeWithName+0xa7a)[0x779dd08a]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(PyEval_EvalCodeEx+0x3e)[0x779dd23e]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(PyEval_EvalCode+0x1b)[0x779dd26b]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(+0x18ade9)[0x779d9de9]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(+0xe9510)[0x77938510]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x604a)[0x778c5d4a]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(+0x6fae0)[0x778beae0]
/home/utils/Python/3.8/3.8.10-20210517/lib/libpython3.8.so.1.0(PyVectorcall_Call+0x5c)[0x778f161c]
./build/ARM/gem5.opt[0x1bd5d71]
--- END LIBC BACKTRACE ---
Segmentation fault

Can someone help me understand/debug this or direct me on how to resolve this?
It would be of great help.

--
Thanks and regards
Siva
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