Re: [PATCH v2 04/40] bsd-user/arm/signal.c: get_mcontext should zero vfp data

[Richard Henderson]

On 1/25/22 12:29, Warner Losh wrote:
> FreeBSD's get_mcontext doesn't return any vfp data. Instead, it zeros
> out the vfp feilds (and all the spare fields). Impelement this
> behavior. We're still missing the sysarch(ARM_GET_VFPCONTEXT) syscall,
> though.
>
> Signed-off-by: Warner Losh <imp@bsdimp.com>
> ---
>   bsd-user/arm/signal.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
>
> diff --git a/bsd-user/arm/signal.c b/bsd-user/arm/signal.c
> index 9026343b478..6eadc6e3c56 100644
> --- a/bsd-user/arm/signal.c
> +++ b/bsd-user/arm/signal.c
> @@ -109,6 +109,14 @@ abi_long get_mcontext(CPUARMState *env, target_mcontext_t 
> *mcp, int flags)
>       gr[TARGET_REG_LR] = tswap32(env->regs[14]);
>       gr[TARGET_REG_PC] = tswap32(env->regs[15]);
>   
> +    /*
> +     * FreeBSD's set_mcontext doesn't save VFP info, but blanks it out instead.
> +     * Instead, sysarch(ARM_GET_VFPSTATE) is used instead.
> +     */

Could be rewritten with fewer "instead".  You wanted get_mcontext.
Otherwise,

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~