On Thu, Apr 14, 2022 at 9:10 AM Xu Kuohai xukuohai@huawei.com wrote:
Add bpf trampoline support for arm64. Most of the logic is the same as x86.
fentry before bpf trampoline hooked: mov x9, x30 nop
fentry after bpf trampoline hooked: mov x9, x30 bl <bpf_trampoline>
Tested on qemu, result: #55 fentry_fexit:OK #56 fentry_test:OK #58 fexit_sleep:OK #59 fexit_stress:OK #60 fexit_test:OK #67 get_func_args_test:OK #68 get_func_ip_test:OK #101 modify_return:OK
Signed-off-by: Xu Kuohai xukuohai@huawei.com Acked-by: Song Liu songliubraving@fb.com
Can you please also take a look at [0], which is an ongoing work to add support for BPF cookie to BPF trampoline-based BPF programs. It's very close to being done, so it would be good if you can implement that at the same time.
[0] https://patchwork.kernel.org/project/netdevbpf/patch/20220412165555.4146407-...
arch/arm64/net/bpf_jit.h | 14 +- arch/arm64/net/bpf_jit_comp.c | 338 +++++++++++++++++++++++++++++++++- 2 files changed, 348 insertions(+), 4 deletions(-)
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