[PATCH] sim: don't rely on inferior_ptid in gdbsim_target::wait

[Simon Marchi]

On 2020-01-19 4:12 p.m., Andrew Burgess wrote:
> * Simon Marchi <simon.marchi@polymtl.ca> [2020-01-18 22:55:57 -0500]:
> 
>> When running a program with the simulator target, I get:
>>
>>     /home/simark/src/binutils-gdb/gdb/inferior.c:279: internal-error: inferior* find_inferior_pid(process_stratum_target*, int): Assertion `pid != 0' failed.
>>
>> This can be reproduced by building a GDB for --target=arm-none-gnueabi,
>> and running with
>>
>>     $ ./gdb -nx --data-directory=data-directory a.out -ex "target sim" -ex load -ex "b main" -ex r
>>
>> Where a.out is any program with a main.
>>
>> The problem is that gdbsim_target::wait assumes that inferior_ptid has
>> the value of the thread it wants to report an event for.
>>
>> Actually, it's the target's responsibility to come up with the ptid of
>> the thread the event is for.  In the sim target, that ptid is stored in
>> sim_inferior_data::remote_sim_ptid, so return that instead of
>> inferior_ptid.
>>
>> ChangeLog:
>>
>> 	* remote-sim.c (gdbsim_target::wait): Return
>> 	sim_data->remote_sim_ptid instead of inferior_ptid.
> 
> This makes sense.  LGTM.
> 
> Thanks,
> Andrew

Thanks, I pushed it.

Simon