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On Wed, Aug 28, 2013 at 02:49:52AM +0400, Vladimir Murzin wrote:
> commit b6069a9570 (filter: add MOD operation) added generic
> support for modulus operation in BPF.
>
> This patch brings JIT support for PPC64
>
> Signed-off-by: Vladimir Murzin <murzi...@gmail.com>
> ---
> arch/powerpc/net/bpf_jit_comp.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
> index bf56e33..96f24dc 100644
> --- a/arch/powerpc/net/bpf_jit_comp.c
> +++ b/arch/powerpc/net/bpf_jit_comp.c
> @@ -193,6 +193,28 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32
> *image,
> PPC_MUL(r_A, r_A, r_scratch1);
> }
> break;
> + case BPF_S_ALU_MOD_X: /* A %= X; */
> + ctx->seen |= SEEN_XREG;
> + PPC_CMPWI(r_X, 0);
> + if (ctx->pc_ret0 != -1) {
> + PPC_BCC(COND_EQ, addrs[ctx->pc_ret0]);
> + } else {
> + PPC_BCC_SHORT(COND_NE, (ctx->idx*4)+12);
> + PPC_LI(r_ret, 0);
> + PPC_JMP(exit_addr);
> + }
> + PPC_DIVWU(r_scratch1, r_A, r_X);
> + PPC_MUL(r_scratch1, r_X, r_scratch1);
> + PPC_SUB(r_A, r_A, r_scratch1);
> + break;
> + case BPF_S_ALU_MOD_K: /* A %= K; */
> +#define r_scratch2 (r_scratch1 + 1)
> + PPC_LI32(r_scratch2, K);
> + PPC_DIVWU(r_scratch1, r_A, r_scratch2);
> + PPC_MUL(r_scratch1, r_scratch2, r_scratch1);
> + PPC_SUB(r_A, r_A, r_scratch1);
> +#undef r_scratch2
> + break;
> case BPF_S_ALU_DIV_X: /* A /= X; */
> ctx->seen |= SEEN_XREG;
> PPC_CMPWI(r_X, 0);
> --
> 1.8.1.5
>
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