From: Xu Kuohai <xukuohai@huawei.com>
To: Jon Hunter <jonathanh@nvidia.com>, <bpf@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Will Deacon <will@kernel.org>, KP Singh <kpsingh@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Zi Shen Lim <zlim.lnx@gmail.com>, Martin KaFai Lau <kafai@fb.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>, <x86@kernel.org>,
"H . Peter Anvin" <hpa@zytor.com>,
Jakub Kicinski <kuba@kernel.org>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Russell King <rmk+kernel@armlinux.org.uk>,
James Morse <james.morse@arm.com>, Hou Tao <houtao1@huawei.com>,
Jason Wang <wangborong@cdjrlc.com>
Subject: Re: [PATCH bpf-next v9 3/4] bpf, arm64: Implement bpf_arch_text_poke() for arm64
Date: Mon, 18 Jul 2022 23:37:01 +0800 [thread overview]
Message-ID: <b0e740c4-9630-c539-e811-a4ad93fcca5c@huawei.com> (raw)
In-Reply-To: <8de014c1-aa63-5783-e5fd-53b7fdece805@nvidia.com>
On 7/18/2022 9:52 PM, Jon Hunter wrote:
[..]
>
> This change appears to be causing the build to fail ...
>
> /tmp/cc52xO0c.s: Assembler messages:
> /tmp/cc52xO0c.s:8: Error: operand 1 should be an integer register --
> `mov lr,x9'
> /tmp/cc52xO0c.s:7: Error: undefined symbol lr used as an immediate value
> make[2]: *** [scripts/Makefile.build:250: arch/arm64/net/bpf_jit_comp.o]
> Error 1
> make[1]: *** [scripts/Makefile.build:525: arch/arm64/net] Error 2
>
> Let me know if you have any thoughts.
>
Sorry for this failure, but I can't reproduce it.
I guess maybe your assembler doesn't recognize "lr". Could you give a
try to replace "lr" with "x30"?
#if IS_ENABLED(CONFIG_ARM64_BTI_KERNEL)
" bti j\n" /* dummy_tramp is called via "br x10" */
#endif
-" mov x10, lr\n"
-" mov lr, x9\n"
+" mov x10, x30\n"
+" mov x30, x9\n"
" ret x10\n"
" .size dummy_tramp, .-dummy_tramp\n"
" .popsection\n
Thanks.
> Cheers
> Jon
>
next prev parent reply other threads:[~2022-07-18 15:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-11 15:08 [PATCH bpf-next v9 0/4] bpf trampoline for arm64 Xu Kuohai
2022-07-11 15:08 ` [PATCH bpf-next v9 1/4] bpf: Remove is_valid_bpf_tramp_flags() Xu Kuohai
2022-07-11 15:08 ` [PATCH bpf-next v9 2/4] arm64: Add LDR (literal) instruction Xu Kuohai
2022-07-11 15:08 ` [PATCH bpf-next v9 3/4] bpf, arm64: Implement bpf_arch_text_poke() for arm64 Xu Kuohai
2022-07-18 13:52 ` Jon Hunter
2022-07-18 15:37 ` Xu Kuohai [this message]
2022-07-21 7:29 ` Jon Hunter
2022-07-11 15:08 ` [PATCH bpf-next v9 4/4] bpf, arm64: bpf trampoline " Xu Kuohai
2022-07-11 19:10 ` [PATCH bpf-next v9 0/4] " patchwork-bot+netdevbpf
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