Commit f48012f1 authored by Hengqi Chen's avatar Hengqi Chen Committed by Huacai Chen
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LoongArch: BPF: Support sign-extension mov instructions 



Add support for sign-extension mov instructions.

Signed-off-by: default avatarHengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 7111afe8

arch/loongarch/net/bpf_jit.c

+17 −2
Original line number Diff line number Diff line
@@ -472,9 +472,24 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext 
	/* dst = src */

	case BPF_ALU | BPF_MOV | BPF_X:

	case BPF_ALU64 | BPF_MOV | BPF_X:

		switch (off) {

		case 0:

			move_reg(ctx, dst, src);

			emit_zext_32(ctx, dst, is32);

			break;

		case 8:

			move_reg(ctx, t1, src);

			emit_insn(ctx, extwb, dst, t1);

			break;

		case 16:

			move_reg(ctx, t1, src);

			emit_insn(ctx, extwh, dst, t1);

			break;

		case 32:

			emit_insn(ctx, addw, dst, src, LOONGARCH_GPR_ZERO);

			break;

		}

		break;



	/* dst = imm */

	case BPF_ALU | BPF_MOV | BPF_K: