Daniel Borkmann a2284d912b bpf, arm64: fix stack_depth tracking in combination with tail calls ... Using dynamic stack_depth tracking in arm64 JIT is currently broken in combination with tail calls. In prologue, we cache ctx->stack_size and adjust SP reg for setting up function call stack, and tearing it down again in epilogue. Problem is that when doing a tail call, the cached ctx->stack_size might not be the same. One way to fix the problem with minimal overhead is to re-adjust SP in emit_bpf_tail_call() and properly adjust it to the current program's ctx->stack_size. Tested on Cavium ThunderX ARMv8. Fixes: f1c9eed7f4 ("bpf, arm64: take advantage of stack_depth tracking") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2018-01-16 11:29:15 -08:00
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Makefile	arm64: eBPF JIT compiler	2014-09-08 14:39:21 +01:00
bpf_jit.h	bpf, arm64: implement jiting of BPF_J{LT, LE, SLT, SLE}	2017-08-09 16:53:56 -07:00
bpf_jit_comp.c	bpf, arm64: fix stack_depth tracking in combination with tail calls	2018-01-16 11:29:15 -08:00