Hi Yuan,
I use it all the time to see where my implementation is failing, the way
you can do it is
1. Compile gem5 in debug mode (you can do opt too but I prefer debug)
2. Run the application with gdb - - args (gem5 cli command)
3. Then run the application(type “r”)
4. Type “bt” to perform backtrace
On Fri, Oct 2, 2020 at 12:13 PM Shougang Yuan <syu...@ncsu.edu> wrote:
> Hi, Abhishek,
>
> Thanks for your help. Do you have any hints about gdb backtrace in gem5? I
> am new to gdb debugging.
>
> Best regards.
>
> On Fri, Oct 2, 2020 at 12:03 PM Abhishek Singh <
> abhishek.singh199...@gmail.com> wrote:
>
>> Hi Yuan,
>>
>> Can you just backtrace using gdb, this will directly point the gem5
>> function which is giving the error?
>>
>> On Fri, Oct 2, 2020 at 12:01 PM Shougang Yuan via gem5-users <
>> gem5-users@gem5.org> wrote:
>>
>>> Hi, Giacomo,
>>>
>>> Thanks for your help. I am currently suffering a new problem. I set the
>>> break tick to be a relatively large number because the segmentation faults
>>> in my simulation happen after several millions of instructions, and the gdb
>>> has run the whole night up to now but it still can not reach the tick I
>>> want to look at. So do you know how to jump to the interesting program
>>> phase more quickly?
>>>
>>> Best regards.
>>> Shougang
>>>
>>> On Fri, Oct 2, 2020 at 5:49 AM Giacomo Travaglini <
>>> giacomo.travagl...@arm.com> wrote:
>>>
>>>> Hi Shougang
>>>>
>>>>
>>>>
>>>> curTick is a function as you can see from:
>>>>
>>>>
>>>>
>>>> (gdb) p curTick
>>>> $1 = {Tick (void)} 0x5555562aea48 <curTick()>
>>>>
>>>>
>>>>
>>>> Could you try doing:
>>>>
>>>>
>>>>
>>>> (gdb) p curTick()
>>>>
>>>>
>>>>
>>>> It should display the current Tick time
>>>>
>>>>
>>>>
>>>> Giacomo
>>>>
>>>>
>>>>
>>>> *From:* Shougang Yuan via gem5-users <gem5-users@gem5.org>
>>>> *Sent:* 02 October 2020 04:00
>>>> *To:* gem5 users mailing list <gem5-users@gem5.org>
>>>> *Cc:* Shougang Yuan <syu...@ncsu.edu>
>>>> *Subject:* [gem5-users] GDB debug help
>>>>
>>>>
>>>>
>>>> Hi, All,
>>>>
>>>>
>>>>
>>>> I am running simulation in se mode and trying to use gdb debug a
>>>> segmentation fault. Through trace debug, I found that the simulation
>>>> suffers a segmentation fault in tick 534558604750.
>>>>
>>>>
>>>>
>>>> To figure out the reason for this bug, I launched the gdb debugger. But
>>>> I suffered some weird results. Usually, when using gdb debug, we use
>>>> "--debug-break" or "schedBrak()" to set breakpoint. And we can use "p
>>>> curTick" to dump out the current tick.
>>>>
>>>>
>>>>
>>>> My simulation stopped at tick 534558604750, and I sched the break in
>>>> tick 1000000. It is much more early than the time when this memory bug
>>>> happens. But when I call "p curTick", the gdb dumped out something like the
>>>> following:
>>>>
>>>>
>>>>
>>>> Program received signal SIGTRAP, Trace/breakpoint trap.
>>>> 0x00007ffff5c28237 in kill () at ../sysdeps/unix/syscall-template.S:78
>>>> 78 ../sysdeps/unix/syscall-template.S: No such file or directory.
>>>> (gdb) p curTick
>>>> $1 = {Tick (void)} 0x5555562aea48 <curTick()>
>>>> (gdb) p _curTick
>>>> No symbol "_curTick" in current context.
>>>> (gdb)
>>>>
>>>>
>>>>
>>>> And when I set the breakpoint time to tick 2000, this is the very
>>>> beginning of the simulation, I still can not dump out the current tick
>>>> value.
>>>>
>>>>
>>>>
>>>> So what's wrong with it? Can some please help me out? Thanks for your
>>>> help.
>>>>
>>>>
>>>>
>>>> Best regards.
>>>>
>>>> Yuan
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>>
>> --
>> Best Regards,
>> Abhishek
>>
> --
Best Regards,
Abhishek
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