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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