On Thu, Oct 28, 2021 at 11:22 AM Richard Henderson <
richard.hender...@linaro.org> wrote:
> On 10/19/21 9:44 AM, Warner Losh wrote:
> > Arm specific user context structures for signal handling and the closely
> > related trap frame.
> >
> > Signed-off-by: Stacey Son <s...@freebsd.org>
> > Signed-off-by: Warner Losh <i...@bsdimp.com>
> > ---
> > bsd-user/arm/target_arch_signal.h | 38 +++++++++++++++++++++++++++++++
> > 1 file changed, 38 insertions(+)
> >
> > diff --git a/bsd-user/arm/target_arch_signal.h
> b/bsd-user/arm/target_arch_signal.h
> > index 9fee58ca9c..67355ff28f 100644
> > --- a/bsd-user/arm/target_arch_signal.h
> > +++ b/bsd-user/arm/target_arch_signal.h
> > @@ -90,4 +90,42 @@ typedef struct target_mcontext {
> > } __fpu;
> > } target_mcontext_t;
> >
> > +typedef struct target_ucontext {
> > + target_sigset_t uc_sigmask;
> > + target_mcontext_t uc_mcontext;
> > + abi_ulong uc_link;
> > + target_stack_t uc_stack;
> > + int32_t uc_flags;
> > + int32_t __spare__[4];
> > +} target_ucontext_t;
>
> This is from the common <sys/_ucontext.h>. Is there any way we can share
> that here in
> qemu as well?
>
That's a good idea.
> > +struct target_sigframe {
> > + target_siginfo_t sf_si; /* saved siginfo */
> > + target_ucontext_t sf_uc; /* saved ucontext */
> > +};
>
> You're missing the storage for
> mcontext_vfp_t sf_vfp
>
the address of which goes in mcontext_t.mc_vfp_ptr
Added.
> (which isn't in the version of
> mcontext_t from patch 18).
>
Added to my revised patch 18.
> > +/* compare to sys/arm/include/frame.h */
> > +struct target_trapframe {
> > + abi_ulong tf_spsr; /* Zero on arm26 */
> > + abi_ulong tf_r0;
> > + abi_ulong tf_r1;
> > + abi_ulong tf_r2;
> > + abi_ulong tf_r3;
> > + abi_ulong tf_r4;
> > + abi_ulong tf_r5;
> > + abi_ulong tf_r6;
> > + abi_ulong tf_r7;
> > + abi_ulong tf_r8;
> > + abi_ulong tf_r9;
> > + abi_ulong tf_r10;
> > + abi_ulong tf_r11;
> > + abi_ulong tf_r12;
> > + abi_ulong tf_usr_sp;
> > + abi_ulong tf_usr_lr;
> > + abi_ulong tf_svc_sp; /* Not used on arm26 */
> > + abi_ulong tf_svc_lr; /* Not used on arm26 */
> > + abi_ulong tf_pc;
> > +};
>
> This is not used by the user abi for signals. It is a kernel structure
> for its own
> internal trap handling. Why are you including it?
>
This code pre-dates my time... But I think it was included because the code
in target_arch_thread.h in patch 13 took its size. But it turns out that's
bogus too. It
accidentally gets things aligned correctly, but should just be removed with
this struct as well. The kernel doesn't use it.
What's worse, ppc, aarch64 and riscv all copied this bogus trope :(. At
least I'll have a chance to fix it before you see it...
I've updated x86 that's upstream in my patch series as well... I'll send it
out Monday or maybe over the weekend.
Warner
