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LoongArch: BPF: Support sign-extension mov instructions

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Add support for sign-extension mov instructions.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Hengqi Chen 2023-11-08 14:12:16 +08:00 committed by Huacai Chen
parent 7111afe8fb
commit f48012f161
1 changed files with 17 additions and 2 deletions
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19
arch/loongarch/net/bpf_jit.c
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@ -472,8 +472,23 @@ 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:
move_reg(ctx, dst, src);
emit_zext_32(ctx, dst, is32);
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 */