Commit 694896ad authored by Pu Lehui's avatar Pu Lehui Committed by Alexei Starovoitov
Browse files

riscv, bpf: Support sign-extension mov insns 



Add support sign-extension mov instructions for RV64.

Signed-off-by: default avatarPu Lehui <pulehui@huawei.com>
Acked-by: default avatarBjörn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/r/20230824095001.3408573-4-pulehui@huaweicloud.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 3d06d816

arch/riscv/net/bpf_jit_comp64.c

+13 −1
Original line number Diff line number Diff line
@@ -1047,7 +1047,19 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx, 
			emit_zext_32(rd, ctx);

			break;

		}

		switch (insn->off) {

		case 0:

			emit_mv(rd, rs, ctx);

			break;

		case 8:

		case 16:

			emit_slli(RV_REG_T1, rs, 64 - insn->off, ctx);

			emit_srai(rd, RV_REG_T1, 64 - insn->off, ctx);

			break;

		case 32:

			emit_addiw(rd, rs, 0, ctx);

			break;

		}

		if (!is64 && !aux->verifier_zext)

			emit_zext_32(rd, ctx);

		break;