On Thu, Apr 20, 2017 at 11:44:17AM +1000, Sam Bobroff wrote: > On a fully emulated Power8 system, user space is currently unable to > read from USPRG3 (SPR number 0x103) because it receives an illegal > instruction exception. > > However the ISA indicates that it should have read access (to the > content of SPR 0x113, similar to some other registers with user space > read-only counterparts). > > This patch registers the new SPR for Book 3S processors and has it > provide read-only access to SPR 0x113. > > Signed-off-by: Sam Bobroff <sam.bobr...@au1.ibm.com>
Heh. I merged a more or less equivalent patch from someone else just
this morning.
> ---
> target/ppc/translate_init.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
> index c1a901455c..f863875835 100644
> --- a/target/ppc/translate_init.c
> +++ b/target/ppc/translate_init.c
> @@ -8235,6 +8235,14 @@ static void gen_spr_power8_rpr(CPUPPCState *env)
> #endif
> }
>
> +static void gen_spr_book3s_usprg3(CPUPPCState *env)
> +{
> + spr_register(env, SPR_USPRG3, "USPRG3",
> + &spr_read_ureg, SPR_NOACCESS,
> + &spr_read_ureg, SPR_NOACCESS,
> + 0x00000000);
> +}
> +
> static void init_proc_book3s_common(CPUPPCState *env)
> {
> gen_spr_ne_601(env);
> @@ -8243,6 +8251,7 @@ static void init_proc_book3s_common(CPUPPCState *env)
> gen_spr_book3s_pmu_sup(env);
> gen_spr_book3s_pmu_user(env);
> gen_spr_book3s_ctrl(env);
> + gen_spr_book3s_usprg3(env);
> }
>
> static void init_proc_970(CPUPPCState *env)
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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