[Qemu-devel] [gdbstub] qemu is killed by gdb

[Qemu-devel] [gdbstub] qemu is killed by gdb

[Alon Bar-Lev]

Hello,

I am aware that this was discussed many times, however, problem remains.

Use case loading u-boot.

1. Run qemu in debug mode:
$ qemu-system-mips -M malta -nographic -m 256 -s -S

2. Run gdb:
$ mips-unknown-linux-uclibceabi-gdb
(gdb) target remote :1234
(gdb) load u-boot
(gdb) target exec

In this case qemu master is killed by the gdb while it should remain
running, it used to work in older versions of qemu.

There was a patch that was reverted[1] with a solution that apparently
not working.

Is there any other sequence to load and run ELF into qemu by gdb?

Thanks,
Alon

[1] https://git.greensocs.com/fkonrad/mttcg/commit/ce0274f730eacbd24c706523ddbbabb6b95d0659

Re: [Qemu-devel] [gdbstub] qemu is killed by gdb

[KONRAD Frederic]

Hi Alon,

Which repos/branch are you using?
If you are using mttcg (the repo you mention in [1]) this is a known bug.

Thanks,
Fred

Le 05/07/2016 à 21:50, Alon Bar-Lev a écrit :
> Hello,
>
> I am aware that this was discussed many times, however, problem remains.
>
> Use case loading u-boot.
>
> 1. Run qemu in debug mode:
> $ qemu-system-mips -M malta -nographic -m 256 -s -S
>
> 2. Run gdb:
> $ mips-unknown-linux-uclibceabi-gdb
> (gdb) target remote :1234
> (gdb) load u-boot
> (gdb) target exec
>
> In this case qemu master is killed by the gdb while it should remain
> running, it used to work in older versions of qemu.
>
> There was a patch that was reverted[1] with a solution that apparently
> not working.
>
> Is there any other sequence to load and run ELF into qemu by gdb?
>
> Thanks,
> Alon
>
> [1] https://git.greensocs.com/fkonrad/mttcg/commit/ce0274f730eacbd24c706523ddbbabb6b95d0659
>

Re: [Qemu-devel] [gdbstub] qemu is killed by gdb

[Alon Bar-Lev]

On 5 July 2016 at 23:17, KONRAD Frederic <fred.konrad@greensocs.com> wrote:
> Hi Alon,
>
> Which repos/branch are you using?
> If you are using mttcg (the repo you mention in [1]) this is a known bug.

Hi,
I use qemu releases or qemu master.
I only referenced the [1] to show that this was already discussed,
fixed, reverted, workarounded, solved but not working :)
Thanks,
Alon

>
> Thanks,
> Fred
>
>
> Le 05/07/2016 à 21:50, Alon Bar-Lev a écrit :
>>
>> Hello,
>>
>> I am aware that this was discussed many times, however, problem remains.
>>
>> Use case loading u-boot.
>>
>> 1. Run qemu in debug mode:
>> $ qemu-system-mips -M malta -nographic -m 256 -s -S
>>
>> 2. Run gdb:
>> $ mips-unknown-linux-uclibceabi-gdb
>> (gdb) target remote :1234
>> (gdb) load u-boot
>> (gdb) target exec
>>
>> In this case qemu master is killed by the gdb while it should remain
>> running, it used to work in older versions of qemu.
>>
>> There was a patch that was reverted[1] with a solution that apparently
>> not working.
>>
>> Is there any other sequence to load and run ELF into qemu by gdb?
>>
>> Thanks,
>> Alon
>>
>> [1]
>> https://git.greensocs.com/fkonrad/mttcg/commit/ce0274f730eacbd24c706523ddbbabb6b95d0659
>>
>

Re: [Qemu-devel] [gdbstub] qemu is killed by gdb

[Alon Bar-Lev]

Hi,
Is someone interested in making gdb work when debugging qemu using -s -S?
Currently qemu just quits, see below.
Thanks!
Alon

On 5 July 2016 at 22:50, Alon Bar-Lev <alon.barlev@gmail.com> wrote:
> Hello,
>
> I am aware that this was discussed many times, however, problem remains.
>
> Use case loading u-boot.
>
> 1. Run qemu in debug mode:
> $ qemu-system-mips -M malta -nographic -m 256 -s -S
>
> 2. Run gdb:
> $ mips-unknown-linux-uclibceabi-gdb
> (gdb) target remote :1234
> (gdb) load u-boot
> (gdb) target exec
>
> In this case qemu master is killed by the gdb while it should remain
> running, it used to work in older versions of qemu.
>
> There was a patch that was reverted[1] with a solution that apparently
> not working.
>
> Is there any other sequence to load and run ELF into qemu by gdb?
>
> Thanks,
> Alon
>
> [1] https://git.greensocs.com/fkonrad/mttcg/commit/ce0274f730eacbd24c706523ddbbabb6b95d0659