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Commit f860203b authored by Jiong Wang's avatar Jiong Wang Committed by Alexei Starovoitov
Browse files

s390: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_* 



This patch implements code-gen for BPF_ALU | BPF_ARSH | BPF_*.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarJiong Wang <jiong.wang@netronome.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 44cf43c0

arch/s390/net/bpf_jit_comp.c

+12 −0
Original line number Diff line number Diff line
@@ -821,10 +821,22 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, int i 
	/*

	 * BPF_ARSH

	 */

	case BPF_ALU | BPF_ARSH | BPF_X: /* ((s32) dst) >>= src */

		/* sra %dst,%dst,0(%src) */

		EMIT4_DISP(0x8a000000, dst_reg, src_reg, 0);

		EMIT_ZERO(dst_reg);

		break;

	case BPF_ALU64 | BPF_ARSH | BPF_X: /* ((s64) dst) >>= src */

		/* srag %dst,%dst,0(%src) */

		EMIT6_DISP_LH(0xeb000000, 0x000a, dst_reg, dst_reg, src_reg, 0);

		break;

	case BPF_ALU | BPF_ARSH | BPF_K: /* ((s32) dst >> imm */

		if (imm == 0)

			break;

		/* sra %dst,imm(%r0) */

		EMIT4_DISP(0x8a000000, dst_reg, REG_0, imm);

		EMIT_ZERO(dst_reg);

		break;

	case BPF_ALU64 | BPF_ARSH | BPF_K: /* ((s64) dst) >>= imm */

		if (imm == 0)

			break;