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Re: [PATCH/gdbserver] Remove current_inferior's save/restore when call get_thread_regcache.
On 05/04/2012 08:31 PM, Pedro Alves wrote:
>> > - regcache = get_thread_regcache (current_inferior, 1);
>> > + regcache = get_thread_regcache (get_lwp_thread (lwp), 1);
>> > pc = (*the_low_target.get_pc) (regcache);
>
> No, the_low_target.get_pc also needs to go to the right inferior.
>
I thought the_low_target.get_pc is to extract value of pc from regcache,
so inferior is not needed. I examined linux-foo-low.c files again, and
find only ppc_get_pc needs the right inferior, sigh.
>> >
>> > return child;
>> > diff --git a/gdb/gdbserver/proc-service.c b/gdb/gdbserver/proc-service.c
>> > index 5584dab..d4c17a2 100644
>> > --- a/gdb/gdbserver/proc-service.c
>> > +++ b/gdb/gdbserver/proc-service.c
>> > @@ -99,20 +99,15 @@ ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
>> > {
>> > #ifdef HAVE_REGSETS
>> > struct lwp_info *lwp;
>> > - struct thread_info *reg_inferior, *save_inferior;
>> > struct regcache *regcache;
>> >
>> > lwp = find_lwp_pid (pid_to_ptid (lwpid));
>> > if (lwp == NULL)
>> > return PS_ERR;
>> >
>> > - reg_inferior = get_lwp_thread (lwp);
>> > - save_inferior = current_inferior;
>> > - current_inferior = reg_inferior;
>> > - regcache = get_thread_regcache (current_inferior, 1);
>> > + regcache = get_thread_regcache (get_lwp_thread (lwp), 1);
>> > gregset_info ()->fill_function (regcache, gregset);
>
> Ditto the whole gregset_info ()->fill_function line, particularly
> after my multi-process/multi-arch series, while the fill_function
> depends on inferior.
>
So any code needs inferior should be wrapped in the follow manner?
save_inferior = current_inferior;
current_inferior = reg_inferior;
....
....
current_inferior = save_inferior;
The following question is what functions need inferior? AFAICS, all the
methods in the_low_target and functions in `struct regset_info' need
inferior. Anything else?
If methods in the_low_target may need inferior, all the usage of
the_low_target methods should be wrapped by the block above. Is it
correct? I hope I am wrong :)
--
Yao (éå)