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Message-ID: <6c18a27f-c983-58f3-1dc0-5192f7df232a@huawei.com>
Date: Sat, 16 Apr 2022 09:57:12 +0800
From: Xu Kuohai <xukuohai@...wei.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
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Subject: Re: [PATCH bpf-next v2 5/6] bpf, arm64: bpf trampoline for arm64
On 4/16/2022 1:12 AM, Andrii Nakryiko wrote:
> On Thu, Apr 14, 2022 at 9:10 AM Xu Kuohai <xukuohai@...wei.com> wrote:
>>
>> Add bpf trampoline support for arm64. Most of the logic is the same as
>> x86.
>>
>> fentry before bpf trampoline hooked:
>> mov x9, x30
>> nop
>>
>> fentry after bpf trampoline hooked:
>> mov x9, x30
>> bl <bpf_trampoline>
>>
>> Tested on qemu, result:
>> #55 fentry_fexit:OK
>> #56 fentry_test:OK
>> #58 fexit_sleep:OK
>> #59 fexit_stress:OK
>> #60 fexit_test:OK
>> #67 get_func_args_test:OK
>> #68 get_func_ip_test:OK
>> #101 modify_return:OK
>>
>> Signed-off-by: Xu Kuohai <xukuohai@...wei.com>
>> Acked-by: Song Liu <songliubraving@...com>
>> ---
>
> Can you please also take a look at [0], which is an ongoing work to
> add support for BPF cookie to BPF trampoline-based BPF programs. It's
> very close to being done, so it would be good if you can implement
> that at the same time.
OK, I'll take a look and try to implemnt it.
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