forked from luck/tmp_suning_uos_patched
x86 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 x86_64
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: George Bakos <gbakos@alpinista.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
26964bb72a
commit
280050cc81
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@ -280,6 +280,31 @@ void bpf_jit_compile(struct sk_filter *fp)
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}
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EMIT4(0x31, 0xd2, 0xf7, 0xf3); /* xor %edx,%edx; div %ebx */
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break;
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case BPF_S_ALU_MOD_X: /* A %= X; */
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seen |= SEEN_XREG;
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EMIT2(0x85, 0xdb); /* test %ebx,%ebx */
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if (pc_ret0 > 0) {
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/* addrs[pc_ret0 - 1] is start address of target
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* (addrs[i] - 6) is the address following this jmp
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* ("xor %edx,%edx; div %ebx;mov %edx,%eax" being 6 bytes long)
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*/
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EMIT_COND_JMP(X86_JE, addrs[pc_ret0 - 1] -
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(addrs[i] - 6));
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} else {
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EMIT_COND_JMP(X86_JNE, 2 + 5);
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CLEAR_A();
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EMIT1_off32(0xe9, cleanup_addr - (addrs[i] - 6)); /* jmp .+off32 */
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}
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EMIT2(0x31, 0xd2); /* xor %edx,%edx */
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EMIT2(0xf7, 0xf3); /* div %ebx */
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EMIT2(0x89, 0xd0); /* mov %edx,%eax */
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break;
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case BPF_S_ALU_MOD_K: /* A %= K; */
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EMIT2(0x31, 0xd2); /* xor %edx,%edx */
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EMIT1(0xb9);EMIT(K, 4); /* mov imm32,%ecx */
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EMIT2(0xf7, 0xf1); /* div %ecx */
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EMIT2(0x89, 0xd0); /* mov %edx,%eax */
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break;
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case BPF_S_ALU_DIV_K: /* A = reciprocal_divide(A, K); */
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EMIT3(0x48, 0x69, 0xc0); /* imul imm32,%rax,%rax */
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EMIT(K, 4);
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