On 07/11/2018 11:30 AM, Russell King - ARM Linux wrote: > Hi, > > This series improves the ARM BPF JIT compiler by: > - enumerating the stack layout rather than using constants that happen > to be multiples of four > - rejig the BPF "register" accesses to use negative numbers instead of > positive, which could be confused with register numbers in the bpf2a32 > array. > - since we maintain the ARM FP register as a pointer to the top of our > scratch space (or, with frame pointers enabled, a valid ARM frame > pointer register), we can access our scratch space using FP, which is > constant across all BPF programs, including tail-called programs. > - use immediate forms of ARM instructions where possible, rather than > first loading the immediate into an ARM register. > - use load-with-shift instruction rather than seperate shift instruction > followed by load > - avoid reloading index and array in the tail-call code > - use double-word load/store instructions where available > > Version 2: > - Fix ARMv5 test pointed out by Olof > - Fix build error found by 0-day (adding an additional patch) > > arch/arm/net/bpf_jit_32.c | 982 > ++++++++++++++++++++++++---------------------- > arch/arm/net/bpf_jit_32.h | 42 +- > 2 files changed, 543 insertions(+), 481 deletions(-)
Applied to bpf-next, thanks a lot Russell!
