| Message ID | 20190924210106.27117-4-alex.bennee@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | testing/next (docker,tcg, alpha ;-) | expand |
On 9/24/19 11:00 PM, Alex Bennée wrote: > From: Richard Henderson <richard.henderson@linaro.org> > > The CONFIG_USER_ONLY adjustment blindly mashed the swcr > exception enable bits into the fpcr exception disable bits. > > However, fpcr_exc_enable has already converted the exception > disable bits into the exception status bits in order to make > it easier to mask status bits at runtime. > > Instead, merge the swcr enable bits with the fpcr before we > convert to status bits. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > Message-Id: <20190921043256.4575-4-richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> > --- > target/alpha/helper.c | 23 ++++++++++++++--------- > 1 file changed, 14 insertions(+), 9 deletions(-) > > diff --git a/target/alpha/helper.c b/target/alpha/helper.c > index 10602fb3394..e21c488aa32 100644 > --- a/target/alpha/helper.c > +++ b/target/alpha/helper.c > @@ -46,34 +46,39 @@ void cpu_alpha_store_fpcr(CPUAlphaState *env, uint64_t val) > uint32_t fpcr = val >> 32; > uint32_t t = 0; > > + /* Record the raw value before adjusting for linux-user. */ > + env->fpcr = fpcr; > + > +#ifdef CONFIG_USER_ONLY > + /* > + * Override some of these bits with the contents of ENV->SWCR. > + * In system mode, some of these would trap to the kernel, at > + * which point the kernel's handler would emulate and apply > + * the software exception mask. > + */ > + uint32_t soft_fpcr = alpha_ieee_swcr_to_fpcr(env->swcr) >> 32; > + fpcr |= soft_fpcr & FPCR_STATUS_MASK; > +#endif > + > t |= CONVERT_BIT(fpcr, FPCR_INED, FPCR_INE); > t |= CONVERT_BIT(fpcr, FPCR_UNFD, FPCR_UNF); > t |= CONVERT_BIT(fpcr, FPCR_OVFD, FPCR_OVF); > t |= CONVERT_BIT(fpcr, FPCR_DZED, FPCR_DZE); > t |= CONVERT_BIT(fpcr, FPCR_INVD, FPCR_INV); > > - env->fpcr = fpcr; > env->fpcr_exc_enable = ~t & FPCR_STATUS_MASK; > > env->fpcr_dyn_round = rm_map[(fpcr & FPCR_DYN_MASK) >> FPCR_DYN_SHIFT]; > > env->fpcr_flush_to_zero = (fpcr & FPCR_UNFD) && (fpcr & FPCR_UNDZ); > env->fp_status.flush_inputs_to_zero = (fpcr & FPCR_DNZ) != 0; > - > #ifdef CONFIG_USER_ONLY > - /* > - * Override some of these bits with the contents of ENV->SWCR. > - * In system mode, some of these would trap to the kernel, at > - * which point the kernel's handler would emulate and apply > - * the software exception mask. > - */ > if (env->swcr & SWCR_MAP_DMZ) { > env->fp_status.flush_inputs_to_zero = 1; > } > if (env->swcr & SWCR_MAP_UMZ) { > env->fpcr_flush_to_zero = 1; > } > - env->fpcr_exc_enable &= ~(alpha_ieee_swcr_to_fpcr(env->swcr) >> 32); > #endif > } > >
diff --git a/target/alpha/helper.c b/target/alpha/helper.c index 10602fb3394..e21c488aa32 100644 --- a/target/alpha/helper.c +++ b/target/alpha/helper.c @@ -46,34 +46,39 @@ void cpu_alpha_store_fpcr(CPUAlphaState *env, uint64_t val) uint32_t fpcr = val >> 32; uint32_t t = 0; + /* Record the raw value before adjusting for linux-user. */ + env->fpcr = fpcr; + +#ifdef CONFIG_USER_ONLY + /* + * Override some of these bits with the contents of ENV->SWCR. + * In system mode, some of these would trap to the kernel, at + * which point the kernel's handler would emulate and apply + * the software exception mask. + */ + uint32_t soft_fpcr = alpha_ieee_swcr_to_fpcr(env->swcr) >> 32; + fpcr |= soft_fpcr & FPCR_STATUS_MASK; +#endif + t |= CONVERT_BIT(fpcr, FPCR_INED, FPCR_INE); t |= CONVERT_BIT(fpcr, FPCR_UNFD, FPCR_UNF); t |= CONVERT_BIT(fpcr, FPCR_OVFD, FPCR_OVF); t |= CONVERT_BIT(fpcr, FPCR_DZED, FPCR_DZE); t |= CONVERT_BIT(fpcr, FPCR_INVD, FPCR_INV); - env->fpcr = fpcr; env->fpcr_exc_enable = ~t & FPCR_STATUS_MASK; env->fpcr_dyn_round = rm_map[(fpcr & FPCR_DYN_MASK) >> FPCR_DYN_SHIFT]; env->fpcr_flush_to_zero = (fpcr & FPCR_UNFD) && (fpcr & FPCR_UNDZ); env->fp_status.flush_inputs_to_zero = (fpcr & FPCR_DNZ) != 0; - #ifdef CONFIG_USER_ONLY - /* - * Override some of these bits with the contents of ENV->SWCR. - * In system mode, some of these would trap to the kernel, at - * which point the kernel's handler would emulate and apply - * the software exception mask. - */ if (env->swcr & SWCR_MAP_DMZ) { env->fp_status.flush_inputs_to_zero = 1; } if (env->swcr & SWCR_MAP_UMZ) { env->fpcr_flush_to_zero = 1; } - env->fpcr_exc_enable &= ~(alpha_ieee_swcr_to_fpcr(env->swcr) >> 32); #endif }