On Sun, Oct 21, 2018 at 14:38:38 +0100, Richard Henderson wrote:
> On 10/21/18 1:53 PM, Richard Henderson wrote:
> > On 10/19/18 2:05 AM, Emilio G. Cota wrote:
> >> To avoid a name clash with the soon-to-be-defined cpu_halted() helper.
> >>
> >> Cc: Laurent Vivier <laur...@vivier.eu>
> >> Signed-off-by: Emilio G. Cota <c...@braap.org>
> >> ---
> >> target/m68k/translate.c | 6 +++---
> >> 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > Although for this usage it's probably better to avoid the
> > tcg_global_mem_new_i32 and just use tcg_gen_st_i32.
>
> And, as I read further, you need to convert this use to a helper call.
> Otherwise you've still got an unlocked direct modification to cpu->halted
> from within the TCG generated code.
>
> There are several other targets that do the same thing: alpha, cris, hppa,
> mips, microblaze, ppc. And typically they will do exactly the same thing: set
> the flag and then raise the halt exception.
Ouch -- I entirely missed these!
For v4, I defined helper_cpu_halted_set in tcg-runtime, and
converted all direct setters to it.
Thanks,
Emilio
