linux-kernel - building and using modules on arm64 hikey board

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Date:	Mon, 30 May 2016 12:21:33 +0200
From:	Arend Van Spriel <arend.vanspriel@...adcom.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Hante Meuleman <hante.meuleman@...adcom.com>
Subject: building and using modules on arm64 hikey board

I got myself an arm64 HiKey board from LeMaker and build an Android AOSP
image for it (see [1]). For development I would like to use
CONFIG_MODULES. However, when I try to insmod the build module I get:

[  287.903653] module cfg80211: overflow in relocation type 261 val
ffffffbffc006530

Looking AArch64 ELF documentation [2], section 4.6.5, it has:
code|name            |operation |overflow check   |
261 |R_AARCH64_PREL32|S + A - P |-2^31 <= X < 2^32|

So basically the highest 32 bits should all be one and so ffffffbf is
invalid. From what I could find searching internet it could be an issue
with linker options so I build kernel and modules with V=1. Here the
linker invocation for them:

+ aarch64-linux-android-ld -EL -p --no-undefined -X --build-id -o vmlinux \
-T ./arch/arm64/kernel/vmlinux.lds arch/arm64/kernel/head.o
init/built-in.o \
--start-group usr/built-in.o arch/arm64/kernel/built-in.o
arch/arm64/mm/built-in.o \
arch/arm64/net/built-in.o arch/arm64/kvm/built-in.o
arch/arm64/crypto/built-in.o \
./drivers/firmware/efi/libstub/lib.a kernel/built-in.o certs/built-in.o
mm/built-in.o \
fs/built-in.o ipc/built-in.o security/built-in.o crypto/built-in.o
block/built-in.o \
arch/arm64/lib/lib.a lib/lib.a arch/arm64/lib/built-in.o lib/built-in.o
drivers/built-in.o \
sound/built-in.o firmware/built-in.o net/built-in.o virt/built-in.o
--end-group .tmp_kallsyms2.o

  aarch64-linux-android-ld -EL -r  -T ./scripts/module-common.lds
--build-id \
  -o net/wireless/cfg80211.ko net/wireless/cfg80211.o
net/wireless/cfg80211.mod.o

Attached are vmlinux.lds and module-common.lds. I also tried taking
upstream arch/arm64/kernel/module.lds in hikey-linaro tree. If someone
can give a hint or educated guess at what to try it would be appreciated.

Regards,
Arend

[1] https://source.android.com/source/devices.html#building-kernel
[2]
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf

View attachment "module-common.lds" of type "text/plain" (833 bytes)

View attachment "vmlinux.lds" of type "text/plain" (47276 bytes)