On Wed, Jul 27, 2016 at 07:44:26PM +1000, Benjamin Herrenschmidt wrote: > On Wed, 2016-07-27 at 17:21 +1000, David Gibson wrote: > > On Wed, Jul 27, 2016 at 04:56:29PM +1000, Benjamin Herrenschmidt > > wrote: > > > > > > We don't implement imprecise FP exceptions and using store_current > > > which sets SRR1 to the *previous* instruction never makes sense > > > for these. So let's be truthful and make them precise, which is > > > allowed by the architecture. > > > > > > Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org> > > > --- > > > target-ppc/excp_helper.c | 11 ++++++----- > > > target-ppc/translate.c | 1 - > > > 2 files changed, 6 insertions(+), 6 deletions(-) > > > > > > diff --git a/target-ppc/excp_helper.c b/target-ppc/excp_helper.c > > > index 96c6fd9..02d9e79 100644 > > > --- a/target-ppc/excp_helper.c > > > +++ b/target-ppc/excp_helper.c > > > @@ -274,12 +274,13 @@ static inline void powerpc_excp(PowerPCCPU > > > *cpu, int excp_model, int excp) > > > env->error_code = 0; > > > return; > > > } > > > + > > > + /* FP exceptions always have NIP pointing to the > > > faulting > > > + * instruction, so always use store_next and claim we > > > are > > > + * precise in the MSR. > > > + */ > > > msr |= 0x00100000; > > > - if (msr_fe0 == msr_fe1) { > > > - goto store_next; > > > - } > > > - msr |= 0x00010000; > > > - break; > > > + goto store_next; > > > case POWERPC_EXCP_INVAL: > > > LOG_EXCP("Invalid instruction at " TARGET_FMT_lx "\n", > > > env->nip); > > > msr |= 0x00080000; > > > diff --git a/target-ppc/translate.c b/target-ppc/translate.c > > > index 3cfa40f..ba14bda 100644 > > > --- a/target-ppc/translate.c > > > +++ b/target-ppc/translate.c > > > @@ -3060,7 +3060,6 @@ static void > > > gen_conditional_store(DisasContext *ctx, TCGv EA, > > > int reg, int size) > > > { > > > TCGv t0 = tcg_temp_new(); > > > - uint32_t save_exception = ctx->exception; > > > > This looks like an unrelated change, and one which would break > > compile > > without other changes in gen_conditional_store() that I don't see. > > > > Have you compiled the user-only targets with this change? > > Ah yes, the whole series does work in user-only, I tested, it's > just a messup beween 2 commits. The rest of the change is in: > > "ppc: Rework NIP updates vs. exception generation" > > What happened is that I initially forgot to remove that line > from the above commit, causing a warning. I did a fix, then > folded the fix into the wrong commmit :) > > You can either take it out of this commit and put it into the > above mentioned one, or I can do a 3rd spin... but the fix is > trivial.
Ok, I've fixed it up in place. -- 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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