Re: [PATCH v8 1/3] riscv: Introduce CONFIG_RELOCATABLE

From: Andreas Schwab <schwab@linux-m68k.org>
To: Alexandre Ghiti <alex@ghiti.fr>
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>,
	 Michael Ellerman <mpe@ellerman.id.au>,
	 Nicholas Piggin <npiggin@gmail.com>,
	 Christophe Leroy <christophe.leroy@csgroup.eu>,
	 Paul Walmsley <paul.walmsley@sifive.com>,
	 Palmer Dabbelt <palmer@dabbelt.com>,
	 Albert Ou <aou@eecs.berkeley.edu>,
	 linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	 linux-riscv@lists.infradead.org
Subject: Re: [PATCH v8 1/3] riscv: Introduce CONFIG_RELOCATABLE
Date: Thu, 11 May 2023 20:18:23 +0200	[thread overview]
Message-ID: <87ttwi91g0.fsf@igel.home> (raw)
In-Reply-To: <4adb27d2-325d-3ce0-23b1-ec69a973b4bf@ghiti.fr> (Alexandre Ghiti's message of "Tue, 9 May 2023 21:55:53 +0200")

On Mai 09 2023, Alexandre Ghiti wrote:

> On 5/9/23 21:07, Andreas Schwab wrote:
>> That does not work with UEFI booting:
>>
>> Loading Linux 6.4.0-rc1-1.g668187d-default ...
>> Loading initial ramdisk ...
>> Unhandled exception: Instruction access fault
>> EPC: ffffffff80016d56 RA: 000000008020334e TVAL: 0000007f80016d56
>> EPC: ffffffff002d1d56 RA: 00000000004be34e reloc adjusted
>> Unhandled exception: Load access fault
>> EPC: 00000000fff462d4 RA: 00000000fff462d0 TVAL: ffffffff80016d56
>> EPC: 00000000802012d4 RA: 00000000802012d0 reloc adjusted
>>
>> Code: c825 8e0d 05b3 40b4 d0ef 0636 7493 ffe4 (d783 0004)
>> UEFI image [0x00000000fe65e000:0x00000000fe6e3fff] '/efi\boot\bootriscv64.efi'
>> UEFI image [0x00000000daa82000:0x00000000dcc2afff]
>>
>
> I need more details please, as I have a UEFI bootflow and it works great
> (KASLR is based on a relocatable kernel and works fine in UEFI too).

It also crashes without UEFI.  Disabling CONFIG_RELOCATABLE fixes that.
This was tested on the HiFive Unmatched board.
The kernel image I tested is available from
<https://download.opensuse.org/repositories/Kernel:/HEAD/RISCV/>.  The
same kernel with CONFIG_RELOCATABLE disabled is available from
<https://download.opensuse.org/repositories/home:/Andreas_Schwab:/riscv:/kernel/standard/>.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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