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Re: [Qemu-devel] [PATCH] m68: fix exception stack frame for 68000
From: |
Pavel Dovgalyuk |
Subject: |
Re: [Qemu-devel] [PATCH] m68: fix exception stack frame for 68000 |
Date: |
Fri, 13 Apr 2018 16:12:46 +0300 |
> From: Laurent Vivier [mailto:address@hidden
> Le 13/04/2018 à 13:12, Pavel Dovgalyuk a écrit :
> > 68000 CPUs do not save format in the exception stack frame.
> > This patch adds feature checking to prevent format saving for 68000.
> > m68k_ret() already includes this modification, this patch fixes
> > the exception processing function too.
> >
> > Signed-off-by: Pavel Dovgalyuk <address@hidden>
> > ---
> > target/m68k/op_helper.c | 7 +++++--
> > 1 file changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c
> > index 3a7f7f2..e367133 100644
> > --- a/target/m68k/op_helper.c
> > +++ b/target/m68k/op_helper.c
> > @@ -301,8 +301,11 @@ static inline void do_stack_frame(CPUM68KState *env,
> > uint32_t *sp,
> > cpu_stl_kernel(env, *sp, addr);
> > break;
> > }
> > - *sp -= 2;
> > - cpu_stw_kernel(env, *sp, (format << 12) + (cs->exception_index << 2));
> > + if (m68k_feature(env, M68K_FEATURE_QUAD_MULDIV)) {
> > + /* all except 68000 */
> > + *sp -= 2;
> > + cpu_stw_kernel(env, *sp, (format << 12) + (cs->exception_index <<
> > 2));
> > + }
> > *sp -= 4;
> > cpu_stl_kernel(env, *sp, retaddr);
> > *sp -= 2;
> >
>
> To be the exact counterpart of m68k_rte(), I think you should include
> the "switch () { }" into the "if () { }".
That's right, thank you.
Pavel Dovgalyuk