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LoongArch: BPF: Support signed mod instructions 

Add support for signed mod 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 14:12:21 +08:00 committed by Huacai Chen
parent 2425c9e002
commit 7b6b13d329
1 changed files with 25 additions and 9 deletions
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16
arch/loongarch/net/bpf_jit.c
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@ -588,20 +588,36 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* dst = dst % src */ /* dst = dst % src */
case BPF_ALU | BPF_MOD | BPF_X: case BPF_ALU | BPF_MOD | BPF_X:
case BPF_ALU64 | BPF_MOD | BPF_X: case BPF_ALU64 | BPF_MOD | BPF_X:
if (!off) {
emit_zext_32(ctx, dst, is32); emit_zext_32(ctx, dst, is32);
move_reg(ctx, t1, src); move_reg(ctx, t1, src);
emit_zext_32(ctx, t1, is32); emit_zext_32(ctx, t1, is32);
emit_insn(ctx, moddu, dst, dst, t1); emit_insn(ctx, moddu, dst, dst, t1);
emit_zext_32(ctx, dst, is32); emit_zext_32(ctx, dst, is32);
} else {
emit_sext_32(ctx, dst, is32);
move_reg(ctx, t1, src);
emit_sext_32(ctx, t1, is32);
emit_insn(ctx, modd, dst, dst, t1);
emit_sext_32(ctx, dst, is32);
}
break; break;
/* dst = dst % imm */ /* dst = dst % imm */
case BPF_ALU | BPF_MOD | BPF_K: case BPF_ALU | BPF_MOD | BPF_K:
case BPF_ALU64 | BPF_MOD | BPF_K: case BPF_ALU64 | BPF_MOD | BPF_K:
if (!off) {
move_imm(ctx, t1, imm, is32); move_imm(ctx, t1, imm, is32);
emit_zext_32(ctx, dst, is32); emit_zext_32(ctx, dst, is32);
emit_insn(ctx, moddu, dst, dst, t1); emit_insn(ctx, moddu, dst, dst, t1);
emit_zext_32(ctx, dst, is32); emit_zext_32(ctx, dst, is32);
} else {
move_imm(ctx, t1, imm, false);
emit_sext_32(ctx, t1, is32);
emit_sext_32(ctx, dst, is32);
emit_insn(ctx, modd, dst, dst, t1);
emit_sext_32(ctx, dst, is32);
}
break; break;
/* dst = -dst */ /* dst = -dst */