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Commit b0c06d33 authored by Vladimir Murzin's avatar Vladimir Murzin Committed by Benjamin Herrenschmidt
Browse files

powerpc/bpf: Support MOD operation 



commit b6069a95 (filter: add MOD operation) added generic
support for modulus operation in BPF.

This patch brings JIT support for PPC64

Signed-off-by: default avatarVladimir Murzin <murzin.v@gmail.com>
Acked-by: default avatarMatt Evans <matt@ozlabs.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent a40a2b67

arch/powerpc/net/bpf_jit.h

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 
#define r_X		5

#define r_addr		6

#define r_scratch1	7

#define r_scratch2	8

#define r_D		14

#define r_HL		15

#define r_M		16

arch/powerpc/net/bpf_jit_comp.c

+20 −0
Original line number Diff line number Diff line
@@ -187,6 +187,26 @@ 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; */

			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);

			break;

		case BPF_S_ALU_DIV_X: /* A /= X; */

			ctx->seen |= SEEN_XREG;

			PPC_CMPWI(r_X, 0);