From 29da450cb1a0e7215d3136320daa461ea28fd628 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Tue, 30 May 2017 13:31:27 -0700 Subject: bpf: free up BPF_JMP | BPF_CALL | BPF_X opcode free up BPF_JMP | BPF_CALL | BPF_X opcode to be used by actual indirect call by register and use kernel internal opcode to mark call instruction into bpf_tail_call() helper. Change-Id: I1a45b8e3c13848c9689ce288d4862935ede97fa7 Signed-off-by: Alexei Starovoitov Acked-by: Daniel Borkmann Signed-off-by: David S. Miller --- include/linux/filter.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/filter.h b/include/linux/filter.h index d64498da2a0c..22e9bd1cf047 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -53,6 +53,9 @@ struct bpf_prog_aux; #define BPF_REG_AX MAX_BPF_REG #define MAX_BPF_JIT_REG (MAX_BPF_REG + 1) +/* unused opcode to mark special call to bpf_tail_call() helper */ +#define BPF_TAIL_CALL 0xf0 + /* BPF program can access up to 512 bytes of stack space. */ #define MAX_BPF_STACK 512 -- cgit v1.2.3