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Re: [Qemu-devel] [Qemu-arm] [PATCH 6/6] armv7m: Clear FAULTMASK on retur
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [Qemu-arm] [PATCH 6/6] armv7m: Clear FAULTMASK on return from non-NMI exceptions |
Date: |
Tue, 24 Jan 2017 16:59:52 +0000 |
User-agent: |
mu4e 0.9.19; emacs 25.1.91.4 |
Peter Maydell <address@hidden> writes:
> From: Michael Davidsaver <address@hidden>
>
> FAULTMASK must be cleared on return from all
> exceptions other than NMI.
>
> Signed-off-by: Michael Davidsaver <address@hidden>
> Reviewed-by: Peter Maydell <address@hidden>
> Signed-off-by: Peter Maydell <address@hidden>
> ---
> target/arm/helper.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/target/arm/helper.c b/target/arm/helper.c
> index dc383d1..cfbc622 100644
> --- a/target/arm/helper.c
> +++ b/target/arm/helper.c
> @@ -5969,8 +5969,13 @@ static void do_v7m_exception_exit(CPUARMState *env)
> uint32_t xpsr;
>
> type = env->regs[15];
> - if (env->v7m.exception != 0)
> + if (env->v7m.exception != ARMV7M_EXCP_NMI) {
> + /* Auto-clear FAULTMASK on return from other than NMI */
> + env->daif &= ~PSTATE_F;
> + }
> + if (env->v7m.exception != 0) {
> armv7m_nvic_complete_irq(env->nvic, env->v7m.exception);
> + }
>
> /* Switch to the target stack. */
> switch_v7m_sp(env, (type & 4) != 0);
Reviewed-by: Alex Bennée <address@hidden>
--
Alex Bennée
- [Qemu-devel] [PATCH 0/6] ARMv7M: some simple bugfixes and cleanups, Peter Maydell, 2017/01/20
- [Qemu-devel] [PATCH 6/6] armv7m: Clear FAULTMASK on return from non-NMI exceptions, Peter Maydell, 2017/01/20
- Re: [Qemu-devel] [Qemu-arm] [PATCH 6/6] armv7m: Clear FAULTMASK on return from non-NMI exceptions,
Alex Bennée <=
- [Qemu-devel] [PATCH 1/6] armv7m: MRS/MSR: handle unprivileged access, Peter Maydell, 2017/01/20
- [Qemu-devel] [PATCH 3/6] armv7m: Explicit error for bad vector table, Peter Maydell, 2017/01/20
- [Qemu-devel] [PATCH 2/6] armv7m: Replace armv7m.hack with unassigned_access handler, Peter Maydell, 2017/01/20
- [Qemu-devel] [PATCH 5/6] armv7m: Fix reads of CONTROL register bit 1, Peter Maydell, 2017/01/20