netdev - [RESEND PATCH 2/2] ppc: bpf_jit: support MOD operation

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Message-Id: <1379748334-3313-2-git-send-email-murzin.v@gmail.com>
Date:	Sat, 21 Sep 2013 09:25:34 +0200
From:	Vladimir Murzin <murzin.v@...il.com>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	benh@...nel.crashing.org, paulus@...ba.org, matt@...abs.org,
	edumazet@...gle.com, dborkman@...hat.com,
	Vladimir Murzin <murzin.v@...il.com>
Subject: [RESEND PATCH 2/2] ppc: bpf_jit: support MOD operation

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@...il.com>
Acked-by: Matt Evans <matt@...abs.org>
---
 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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