From: Abhishek Dubey Add support for a new instruction BPF_JMP|BPF_X|BPF_JA, SRC=0, DST=Rx, off=0, imm=0 which does an indirect jump to a location stored in Rx. The register Rx should have type PTR_TO_INSN. This new type ensures that the Rx register contains a value (or a range of values) loaded from a correct jump table – map of type instruction array. Support indirect jump to all registers in powerpc64 JIT using the ctr register. Move Rx content to ctr register, then invoke bctr instruction to branch to address stored in ctr register. Skip save and restore of TOC as the jump is always within the program context. Signed-off-by: Abhishek Dubey --- arch/powerpc/net/bpf_jit_comp64.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c index 33ea07660ebc..8771c9f23c98 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -1604,6 +1604,14 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code addrs[++i] = ctx->idx * 4; break; + /* + * JUMP reg + */ + case BPF_JMP | BPF_JA | BPF_X: + EMIT(PPC_RAW_MTCTR(dst_reg)); + EMIT(PPC_RAW_BCTR()); + break; + /* * Return/Exit */ -- 2.52.0