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Re: [PATCH 6/7] target/alpha: Mask IOV exception with INV for user-only
From: |
Alex Bennée |
Subject: |
Re: [PATCH 6/7] target/alpha: Mask IOV exception with INV for user-only |
Date: |
Mon, 23 Sep 2019 17:39:24 +0100 |
User-agent: |
mu4e 1.3.4; emacs 27.0.50 |
Richard Henderson <address@hidden> writes:
> The kernel masks the integer overflow exception with the
> software invalid exception mask. Include IOV in the set
> of exception bits masked by fpcr_exc_enable.
>
> Fixes the new float_convs test.
>
> Signed-off-by: Richard Henderson <address@hidden>
Reviewed-by: Alex Bennée <address@hidden>
Tested-by: Alex Bennée <address@hidden>
> ---
> target/alpha/helper.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/target/alpha/helper.c b/target/alpha/helper.c
> index 1b3479738b..55d7274d94 100644
> --- a/target/alpha/helper.c
> +++ b/target/alpha/helper.c
> @@ -58,6 +58,13 @@ void cpu_alpha_store_fpcr(CPUAlphaState *env, uint64_t val)
> */
> uint32_t soft_fpcr = alpha_ieee_swcr_to_fpcr(env->swcr) >> 32;
> fpcr |= soft_fpcr & (FPCR_STATUS_MASK | FPCR_DNZ);
> +
> + /*
> + * The IOV exception is disabled by the kernel with SWCR_TRAP_ENABLE_INV,
> + * which got mapped by alpha_ieee_swcr_to_fpcr to FPCR_INVD.
> + * Add FPCR_IOV to fpcr_exc_enable so that it is handled identically.
> + */
> + t |= CONVERT_BIT(soft_fpcr, FPCR_INVD, FPCR_IOV);
> #endif
>
> t |= CONVERT_BIT(fpcr, FPCR_INED, FPCR_INE);
--
Alex Bennée
- [PATCH 2/7] target/alpha: Fix SWCR_MAP_UMZ, (continued)
- [PATCH 2/7] target/alpha: Fix SWCR_MAP_UMZ, Richard Henderson, 2019/09/21
- [PATCH 5/7] target/alpha: Write to fpcr_flush_to_zero once, Richard Henderson, 2019/09/21
- [PATCH 3/7] target/alpha: Fix SWCR_TRAP_ENABLE_MASK, Richard Henderson, 2019/09/21
- [PATCH 7/7] target/alpha: Tidy helper_fp_exc_raise_s, Richard Henderson, 2019/09/21
- [PATCH 6/7] target/alpha: Mask IOV exception with INV for user-only, Richard Henderson, 2019/09/21
- Re: [PATCH 6/7] target/alpha: Mask IOV exception with INV for user-only,
Alex Bennée <=
- [PATCH 4/7] target/alpha: Handle SWCR_MAP_DMZ earlier, Richard Henderson, 2019/09/21
- Re: [PATCH 0/7] target/alpha: Fix linux-user exception for CVTTQ, Alex Bennée, 2019/09/23