[gem5-users] Re: Porting a configuration file from gem5 v20 to gem5 v21
Hi Giacomo,
In SE mode, the segmentation fault is triggered
at line 905 in build/ARM/cpu/o3/cpu.cc.
Following is the code that triggers the interrupt
and the code that is executed in the last two steps before the interrupt.
gef➤ up
#1 0x55dc2969 in gem5::o3::CPU::trap (this=0x5b7ca000,
fault=std::shared_ptr (use count 2, weak count 0) = {...},
tid=0x0, inst=...) at build/ARM/cpu/o3/cpu.cc:905
*905* fault->invoke(threadContexts[tid], inst);
*void*
*CPU::trap(const Fault , ThreadID tid, const StaticInstPtr )*
*{*
*// Pass the thread's TC into the invoke method.*
*fault->invoke(threadContexts[tid], inst); < line 905*
*}*
gef➤ up
#2 0x55dae664 in gem5::o3::Commit::commitHead
(this=0x5b7cd8a0, head_inst=..., inst_num=0x0) at
build/ARM/cpu/o3/commit.cc:1252
*1252* cpu->trap(inst_fault, tid,
* if (inst_fault != NoFault) {*
*……*
*…….*
……..
*assert(!thread[tid]->noSquashFromTC);*
*cpu->trap(inst_fault, tid, <- line 1252*
* head_inst->notAnInst() ? nullStaticInstPtr :*
* head_inst->staticInst);*
gef➤ up
#3 0x55dacbaf in gem5::o3::Commit::commitInsts
(this=0x5b7cd8a0) at build/ARM/cpu/o3/commit.cc:1020
*1020* bool commit_success = commitHead(head_inst,
num_committed);
*if (head_inst->isSquashed()) {*
*……*
*…….*
……..
*} else {*
*pc[tid] = head_inst->pcState();*
*// Try to commit the head instruction.*
*bool commit_success = commitHead(head_inst, num_committed);
< line 1020*
Ali
On Tue, Oct 12, 2021 at 5:01 PM Giacomo Travaglini <
giacomo.travagl...@arm.com> wrote:
>
> > -----Original Message-
> > From: Ali Ghandour via gem5-users
> > Sent: 12 October 2021 08:50
> > To: gem5-users@gem5.org
> > Cc: Ali Ghandour
> > Subject: [gem5-users] Re: Porting a configuration file from gem5 v20 to
> gem5
> > v21
> >
> > Hi Giacomo,
> >
> > Indeed, I was able to use ArmMMU.connectWalkerPorts method and run
> > the config file in fs mode.
>
> Great!
>
> > However, I a, still struggling with the segmentation fault in se mode.
> >
> > Does it make any sense to have a config file working in fs mode but
> failing in
> > se? (notice that it is running in both fs and se mode in v20.0.0.)
> >
>
> It does as I believe the two issues (in SE and FS) are not related to each
> other. You are probably hitting another bug in SE mode.
> If you are getting a segmentation fault you are probably trying to
> dereference an invalid pointer (nullptr?). With GDB, could you navigate the
> stack frames
> until you find the invalid pointer? (just print the pointer you are trying
> to dereference)
>
> > Ali
> > ___
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>
> Kind Regards
>
> Giacomo
> IMPORTANT NOTICE: The contents of this email and any attachments are
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[gem5-users] Re: Porting a configuration file from gem5 v20 to gem5 v21
Hi Giacomo, Indeed, I was able to use ArmMMU.connectWalkerPorts method and run the config file in fs mode. However, I a, still struggling with the segmentation fault in se mode. Does it make any sense to have a config file working in fs mode but failing in se? (notice that it is running in both fs and se mode in v20.0.0.) Ali ___ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
[gem5-users] Re: Porting a configuration file from gem5 v20 to gem5 v21
Hi Jason, I am not sure this is the same issue. I compiled the hello.c example using the below make file and run it in se mode using my config file and still received the segmentation error: CC=aarch64-linux-gnu-gcc CFLAGS=-Wall -g3 -march=armv8-a -static -O0 # -I../ all: arm arm: $(CC) $(CFLAGS) -c hello.c -o hello.o $(CC) $(CFLAGS) hello.o -o hello Please advise. Ali ___ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
[gem5-users] Re: Porting a configuration file from gem5 v20 to gem5 v21
In FS mode, full errror stack below: Traceback (most recent call last): File "", line 1, in File "build/ARM/python/m5/main.py", line 455, in main File "./RPIv4.py", line 535, in main() File "./RPIv4.py", line 512, in main root.system = systemCreate(args) File "./RPIv4.py", line 297, in systemCreate system = RPISystemCreate(ArmSystem, args, mode) File "./RPIv4.py", line 182, in RPISystemCreate return RPISystem(args, mode) File "./RPIv4.py", line 127, in __init__ self.configMem(args) File "./RPIv4.py", line 158, in configMem self.cpu_cluster.connectDirect(self.membus) File "/home/ali/Desktop/spirals/reproduce-spectre-gem5/gem5/./ARMv8A_Cortex_A72.py", line 325, in connectDirect cpu.dtb.walker.port = bus.slave File "build/ARM/python/m5/SimObject.py", line 1416, in __getattr__ AttributeError: object 'ARM_A72_TLB_L1D' has no attribute 'walker' (C++ object is not yet constructed, so wrapped C++ methods are unavailable.) ___ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
[gem5-users] Porting a configuration file from gem5 v20 to gem5 v21
I have a config file that is working properly using gem5 v20.
I spent a lot of time trying to run it using the latest version of gem5.
In SE mode, it gives a segmentation fault.
I tried to debug it using GDB and GEF.
The fault is triggered in
#1 0x55dc2969 in gem5::o3::CPU::trap (this=0x5b7ca000,
fault=std::shared_ptr (use count 2, weak count 0) = {...},
tid=0x0, inst=...) at build/ARM/cpu/o3/cpu.cc:905
905fault->invoke(threadContexts[tid], inst);
In FS mode, it gives the following error:
File "build/ARM/python/m5/SimObject.py", line 1416, in __getattr__
AttributeError: object 'ARM_A72_Cluster' has no attribute 'l2'
(C++ object is not yet constructed, so wrapped C++ methods are
unavailable.)
*My question:Is there a systematic approach thatI can follow to get the
config file working using the latest version of gem5?*
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