OpenCloudOS-Kernel/arch/arm64/net
Yang Shi 4c1cd4fdfd bpf: arm64: remove callee-save registers use for tmp registers
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>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-17 14:03:33 -04:00
..
Makefile arm64: eBPF JIT compiler 2014-09-08 14:39:21 +01:00
bpf_jit.h arm64: bpf: fix div-by-zero case 2015-11-06 16:58:36 +00:00
bpf_jit_comp.c bpf: arm64: remove callee-save registers use for tmp registers 2016-05-17 14:03:33 -04:00