From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [PATCH v2 2/3] arm64: Bail out PIE builds early if load address is not 4K aligned
Date: Mon, 7 Sep 2020 08:57:39 -0400 [thread overview]
Message-ID: <20200907125739.GL24856@bill-the-cat> (raw)
In-Reply-To: <20200907095235.GA2954729@toto>
On Mon, Sep 07, 2020 at 11:52:35AM +0200, Edgar E. Iglesias wrote:
> On Fri, Sep 04, 2020 at 12:43:57PM -0600, Stephen Warren wrote:
> > On 9/4/20 3:07 AM, Edgar E. Iglesias wrote:
> > > From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>
> > >
> > > PIE requires a 4K aligned load address. If this is not met, trap
> > > the startup sequence in a WFI loop rather than running into obscure
> > > failures.
> >
> > > diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
> > > #if CONFIG_POSITION_INDEPENDENT
> > > + /* Verify that we're 4K aligned. */
> >
> > Similar to the comment on the previous patch: I believe the code that
> > implements this check should be outside the #if check, since it's always
> > needed.
>
> But a check for non-PIE would have to be stricter, wouldn't it?
> I.e the load address needs to exactly match the link-time address.
>
> Perhaps we should add the non-PIE check in a separate patch (if at all)?
If we can catch a bad configuration at link time in the non-PIE case (as
said in another part of this thread I believe) then we should, yes,
thanks!
--
Tom
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next prev parent reply other threads:[~2020-09-07 12:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-04 9:07 [PATCH v2 0/3] arm64: Large PIE fixes Edgar E. Iglesias
2020-09-04 9:07 ` [PATCH v2 1/3] arm64: Mention 4K aligned load addresses in the PIE Kconfig help Edgar E. Iglesias
2020-09-04 18:42 ` Stephen Warren
2020-09-06 22:16 ` André Przywara
2020-09-07 9:58 ` Edgar E. Iglesias
2020-09-04 9:07 ` [PATCH v2 2/3] arm64: Bail out PIE builds early if load address is not 4K aligned Edgar E. Iglesias
2020-09-04 18:43 ` Stephen Warren
2020-09-07 9:52 ` Edgar E. Iglesias
2020-09-07 12:57 ` Tom Rini [this message]
2020-09-07 13:40 ` Edgar E. Iglesias
2020-09-08 19:02 ` Stephen Warren
2020-09-04 9:07 ` [PATCH v2 3/3] arm64: Add support for larger PIE U-boot Edgar E. Iglesias
2020-09-04 13:04 ` Michal Simek
2020-09-04 13:11 ` Edgar E. Iglesias
2020-09-04 18:45 ` Stephen Warren
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