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powerpc/bpf: Support MOD operation

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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>
Acked-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Vladimir Murzin 2013-09-28 10:22:01 +02:00 committed by Benjamin Herrenschmidt
parent a40a2b6707
commit b0c06d3335
2 changed files with 21 additions and 0 deletions
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1
arch/powerpc/net/bpf_jit.h
View file

@ -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

20
arch/powerpc/net/bpf_jit_comp.c
View file

@ -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);