Messages in this thread | | | Date | Tue, 17 May 2016 14:03:46 -0400 (EDT) | Subject | Re: [PATCH v2 net-next] bpf: arm64: remove callee-save registers use for tmp registers | From | David Miller <> |
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From: Yang Shi <yang.shi@linaro.org> Date: Mon, 16 May 2016 16:36:26 -0700
> In the current implementation of ARM64 eBPF JIT, R23 and R24 are used for > tmp registers, which are callee-saved registers. This leads to variable size > of JIT prologue and epilogue. The latest blinding constant change prefers to > constant size of prologue and epilogue. AAPCS reserves R9 ~ R15 for temp > registers which not need to be saved/restored during function call. So, replace > R23 and R24 to R10 and R11, and remove tmp_used flag to save 2 instructions for > some jited BPF program. > > CC: Daniel Borkmann <daniel@iogearbox.net> > Acked-by: Zi Shen Lim <zlim.lnx@gmail.com> > Signed-off-by: Yang Shi <yang.shi@linaro.org>
Applied.
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