Re: [PATCH] ppc: bpf_jit: support MOD operation

[Vladimir Murzin <murzin.v@gmail.com>]

Ping

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 <murzin.v@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
>