From: Will Deacon <will@kernel.org>
To: Xu Kuohai <xukuohai@huawei.com>
Cc: bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Zi Shen Lim <zlim.lnx@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
"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 v6 2/4] arm64: Add LDR (literal) instruction
Date: Tue, 5 Jul 2022 17:39:41 +0100 [thread overview]
Message-ID: <20220705163941.GA1339@willie-the-truck> (raw)
In-Reply-To: <20220625161255.547944-3-xukuohai@huawei.com>
On Sat, Jun 25, 2022 at 12:12:53PM -0400, Xu Kuohai wrote:
> Add LDR (literal) instruction to load data from address relative to PC.
> This instruction will be used to implement long jump from bpf prog to
> bpf rampoline in the follow-up patch.
typo: trampoline
>
> The instruction encoding:
>
> 3 2 2 2 0 0
> 0 7 6 4 5 0
> +-----+-------+---+-----+-------------------------------------+--------+
> | 0 x | 0 1 1 | 0 | 0 0 | imm19 | Rt |
> +-----+-------+---+-----+-------------------------------------+--------+
>
> for 32-bit, variant x == 0; for 64-bit, x == 1.
>
> branch_imm_common() is used to check the distance between pc and target
> address, since it's reused by this patch and LDR (literal) is not a branch
> instruction, rename it to aarch64_imm_common().
nit, but I think "label_imm_common()" would be a better name.
Anyway, I checked the encodings and the code looks good, so:
Acked-by: Will Deacon <will@kernel.org>
Will
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next prev parent reply other threads:[~2022-07-05 16:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-25 16:12 [PATCH bpf-next v6 0/4] bpf trampoline for arm64 Xu Kuohai
2022-06-25 16:12 ` [PATCH bpf-next v6 1/4] bpf: Remove is_valid_bpf_tramp_flags() Xu Kuohai
2022-06-25 16:12 ` [PATCH bpf-next v6 2/4] arm64: Add LDR (literal) instruction Xu Kuohai
2022-07-05 16:39 ` Will Deacon [this message]
2022-07-06 1:43 ` Xu Kuohai
2022-06-25 16:12 ` [PATCH bpf-next v6 3/4] bpf, arm64: Impelment bpf_arch_text_poke() for arm64 Xu Kuohai
2022-07-07 16:41 ` Jean-Philippe Brucker
2022-07-08 2:41 ` Xu Kuohai
2022-07-08 8:25 ` Jean-Philippe Brucker
2022-06-25 16:12 ` [PATCH bpf-next v6 4/4] bpf, arm64: bpf trampoline " Xu Kuohai
2022-07-07 16:37 ` Jean-Philippe Brucker
2022-07-08 4:35 ` Xu Kuohai
2022-07-08 8:24 ` Jean-Philippe Brucker
2022-07-08 9:08 ` Xu Kuohai
2022-06-30 21:12 ` [PATCH bpf-next v6 0/4] " Daniel Borkmann
2022-07-05 16:00 ` Will Deacon
2022-07-05 18:34 ` KP Singh
2022-07-07 3:35 ` Xu Kuohai
2022-07-06 16:08 ` Jean-Philippe Brucker
2022-07-06 16:11 ` Will Deacon
2022-07-07 2:56 ` Xu Kuohai
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