From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Puranjay Mohan <puranjay12@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
Shubham Bansal <illusionist.neo@gmail.com>,
Mykola Lysenko <mykolal@fb.com>, Shuah Khan <shuah@kernel.org>,
bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH bpf-next 6/8] arm32, bpf: add support for 64 bit division instruction
Date: Wed, 6 Sep 2023 19:56:08 +0100 [thread overview]
Message-ID: <ZPjLSHG7JToLWvmT@shell.armlinux.org.uk> (raw)
In-Reply-To: <mb61po7if3b0w.fsf@amazon.com>
On Wed, Sep 06, 2023 at 09:29:19AM +0000, Puranjay Mohan wrote:
> On Tue, Sep 05 2023, Russell King (Oracle) wrote:
>
> > On Tue, Sep 05, 2023 at 09:06:19PM +0000, Puranjay Mohan wrote:
> Actually, there can also be a situation where rd[1] != ARM_R0 && rd[1] != ARM_R2,
> so should I do it like:
>
> if (rd[1] != ARM_R0 && rd[1] != ARM_R2) {
> emit(ARM_POP(BIT(ARM_R0) | BIT(ARM_R1)), ctx);
> emit(ARM_POP(BIT(ARM_R2) | BIT(ARM_R3)), ctx);
> } else if (rd[1] != ARM_R0) {
> emit(ARM_POP(BIT(ARM_R0) | BIT(ARM_R1)), ctx);
> emit(ARM_ADD_I(ARM_SP, ARM_SP, 8), ctx);
> } else if (rd[1] != ARM_R2) {
> emit(ARM_ADD_I(ARM_SP, ARM_SP, 8), ctx);
> emit(ARM_POP(BIT(ARM_R2) | BIT(ARM_R3)), ctx);
> } else {
> emit(ARM_ADD_I(ARM_SP, ARM_SP, 16), ctx);
> }
Are you sure all four states are possible?
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2023-09-06 18:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-05 21:06 [PATCH bpf-next 0/8] arm32, bpf: add support for cpuv4 insns Puranjay Mohan
2023-09-05 21:06 ` [PATCH bpf-next 1/8] arm32, bpf: add support for 32-bit offset jmp instruction Puranjay Mohan
2023-09-05 21:11 ` Russell King (Oracle)
2023-09-05 21:06 ` [PATCH bpf-next 2/8] arm32, bpf: add support for sign-extension load instruction Puranjay Mohan
2023-09-05 21:24 ` Russell King (Oracle)
2023-09-06 11:47 ` Puranjay Mohan
2023-09-05 21:06 ` [PATCH bpf-next 3/8] arm32, bpf: add support for sign-extension mov instruction Puranjay Mohan
2023-09-05 21:06 ` [PATCH bpf-next 4/8] arm32, bpf: add support for unconditional bswap instruction Puranjay Mohan
2023-09-05 21:32 ` Russell King (Oracle)
2023-09-06 9:31 ` Puranjay Mohan
2023-09-05 21:06 ` [PATCH bpf-next 5/8] arm32, bpf: add support for 32-bit signed division Puranjay Mohan
2023-09-05 21:44 ` Russell King (Oracle)
2023-09-05 21:06 ` [PATCH bpf-next 6/8] arm32, bpf: add support for 64 bit division instruction Puranjay Mohan
2023-09-05 21:50 ` Russell King (Oracle)
2023-09-06 9:29 ` Puranjay Mohan
2023-09-06 18:56 ` Russell King (Oracle) [this message]
2023-09-06 19:19 ` Puranjay Mohan
2023-09-06 20:26 ` Russell King (Oracle)
2023-09-05 21:06 ` [PATCH bpf-next 7/8] selftest, bpf: enable cpu v4 tests for arm32 Puranjay Mohan
2023-09-05 21:06 ` [PATCH bpf-next 8/8] bpf/tests: add tests for cpuv4 instructions Puranjay Mohan
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