From: Mark Rutland <mark.rutland@arm.com>
To: James Morse <james.morse@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
linux-arm-kernel@lists.infradead.org,
Masami Hiramatsu <mhiramat@kernel.org>
Subject: Re: [PATCH 6/8] arm64: entry: convert el0_sync to C
Date: Fri, 4 Oct 2019 13:57:49 +0100 [thread overview]
Message-ID: <20191004125746.GE34756@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <20191003171642.135652-7-james.morse@arm.com>
On Thu, Oct 03, 2019 at 06:16:40PM +0100, James Morse wrote:
> From: Mark Rutland <mark.rutland@arm.com>
>
> This is largely a 1-1 conversion of asm to C, with a couple of caveats.
>
> The el0_sync{_compat} switches explicitly handle all the EL0 debug
> cases, so el0_dbg doesn't have to try to bail out for unexpected EL1
> debug ESR values. This also means that an unexpected vector catch from
> AArch32 is routed to el0_inv.
>
> We *could* merge the native and compat switches, which would make the
> diffstat negative, but I've tried to stay as close to the existing
> assembly as possible for the moment.
>
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> [split out of a bigger series, added nokprobes. removed irq trace
> calls as the C helpers do this. renamed el0_dbg's use of FAR]
> Signed-off-by: James Morse <james.morse@arm.com>
> Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
> ---
> arch/arm64/include/asm/asm-uaccess.h | 10 --
> arch/arm64/kernel/entry-common.c | 221 +++++++++++++++++++++++++++
> arch/arm64/kernel/entry.S | 206 +------------------------
> 3 files changed, 226 insertions(+), 211 deletions(-)
[...]
> +static void notrace el0_dbg(struct pt_regs *regs, unsigned long esr)
> +{
> + unsigned long addr_if_watchpoint = read_sysreg(far_el1);
> +
> + if (system_uses_irq_prio_masking())
> + gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
> +
> + user_exit_irqoff();
> + do_debug_exception(addr_if_watchpoint, esr, regs);
> + local_daif_restore(DAIF_PROCCTX_NOIRQ);
> +}
> +NOKPROBE_SYMBOL(el0_dbg);
I think that it'd be best to stick with 'far' here, and only have the
'addr_if_watchpoint' name within do_debug_exception(), where it used to
be 'addr'. That way all of this code consistently uses 'far'.
Otherwise this all looks good to me:
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Thanks for all the rework and cleanup!
Mark.
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next prev parent reply other threads:[~2019-10-04 12:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 17:16 [PATCH 0/8] arm64: Convert entry.S synchronous exception handling to C James Morse
2019-10-03 17:16 ` [PATCH 1/8] arm64: Fix incorrect irqflag restore for priority masking for compat James Morse
2019-10-03 17:16 ` [PATCH 2/8] arm64: remove __exception annotations James Morse
2019-10-04 10:17 ` Mark Rutland
2019-10-04 14:10 ` Masami Hiramatsu
2019-10-04 16:08 ` James Morse
2019-10-04 16:34 ` Mark Rutland
2019-10-04 13:03 ` Marc Gonzalez
2019-10-04 16:08 ` James Morse
2019-10-03 17:16 ` [PATCH 3/8] arm64: Add prototypes for functions called by entry.S James Morse
2019-10-04 10:22 ` Mark Rutland
2019-10-03 17:16 ` [PATCH 4/8] arm64: add local_daif_inherit() James Morse
2019-10-03 17:16 ` [PATCH 5/8] arm64: entry: convert el1_sync to C James Morse
2019-10-04 10:39 ` Mark Rutland
2019-10-03 17:16 ` [PATCH 6/8] arm64: entry: convert el0_sync " James Morse
2019-10-04 12:57 ` Mark Rutland [this message]
2019-10-04 16:09 ` James Morse
2019-10-04 16:37 ` Mark Rutland
2019-10-03 17:16 ` [PATCH 7/8] arm64: Remove asmlinkage from updated functions James Morse
2019-10-04 12:58 ` Mark Rutland
2019-10-03 17:16 ` [PATCH 8/8] arm64: entry-common: don't touch daif before bp-hardening James Morse
2019-10-04 13:31 ` Mark Rutland
2019-10-04 16:09 ` James Morse
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