[RFA/ppc-aix] fix thread support breakage (was: "Re: [PATCH 4/5] powerpc64-aix ptrace64 when defined.")

[Joel Brobecker]

Hello again,

> Actually, I just found that it breaks thread support on 32bit AIX,
> at least.  A simpler way to show the problem is:
> 
>     (gdb) x /x &__n_pthreads
>     0xf06a8258 <__n_pthreads>:      Cannot access memory at address 0xf06a8258
> 
> Prior to the patch, we have:
> 
>     (gdb) x /x &__n_pthreads
>     0xf06a8258 <__n_pthreads>:      0x00000003

Attached is the patch I checked in locally at AdaCore:

gdb/ChangeLog:

        * rs6000-nat.c (rs6000_ptrace32): Cast "addr" to "uintptr_t"
        instead of "long long" in call to ptrace64.

Tested on ppc-aix in full 32bit mode (both GDB and inferior are
32bit). I think the other scenario would be 64bit GDB debugging
a 32bit inferior, but I don't have a 64bit compiler to try it.

I'd like to commit this patch, unless there are comments/suggestions.

Thank you,
-- 
Joel
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