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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Lucas Stach <l.stach@pengutronix.de>,
	barebox@lists.infradead.org, rcz@pengutronix.de,
	Lucas Stach <lst@pengutronix.de>
Subject: Re: [PATCH 1/3] ARM64: entry: save/restore potentially clobbered registers
Date: Fri, 20 Dec 2019 17:14:00 +0100	[thread overview]
Message-ID: <ee27a60b-785f-d1fb-545a-7d169eae9363@pengutronix.de> (raw)
In-Reply-To: <98d2d1809d0ec5ce73883bea0280b171e44b7c69.camel@pengutronix.de>

Hi,

On 12/20/19 4:42 PM, Lucas Stach wrote:
>> I did the same in <20191002075754.9257-1-a.fatoum@pengutronix.de>, except for
>> x4-x6 instead of x19-x21, but

Rouven* [was missing here]

> reported that his i.MX8 still didn't boot.
> 
> I have not thoroughly analyzed the called cache maintenance functions,
> but I specifically used x19-x21 as they are defined as callee-saved in
> the aarch64 calling convention.
> x4-x6 would be function parameter/return values, so they might get
> clobbered, right?

Ah, v8_invalidate_dcache_all indeed clobbers x4. So this explains
it. Thanks for fixing. :)

Cheers
Ahmad

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  reply	other threads:[~2019-12-20 16:14 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-19  9:13 [PATCH 0/3] ARM64 early cache fixes Lucas Stach
2019-12-19  9:13 ` [PATCH 1/3] ARM64: entry: save/restore potentially clobbered registers Lucas Stach
2019-12-20 15:34   ` Ahmad Fatoum
2019-12-20 15:42     ` Lucas Stach
2019-12-20 16:14       ` Ahmad Fatoum [this message]
2019-12-19  9:13 ` [PATCH 2/3] ARM: cache_64: invalidate dcache in arm_early_mmu_cache_invalidate Lucas Stach
2019-12-19  9:13 ` [PATCH 3/3] ARM: cache_64: invalidate icache in arm_early_mmu_cache_flush Lucas Stach
2019-12-20 15:14 ` [PATCH 0/3] ARM64 early cache fixes Sascha Hauer

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