Commit 1104247f authored by Xu Kuohai's avatar Xu Kuohai Committed by Daniel Borkmann
Browse files

bpf, arm64: Support unconditional bswap 



Add JIT support for unconditional bswap instructions.

Signed-off-by: default avatarXu Kuohai <xukuohai@huawei.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Tested-by: default avatarFlorent Revest <revest@chromium.org>
Acked-by: default avatarFlorent Revest <revest@chromium.org>
Link: https://lore.kernel.org/bpf/20230815154158.717901-5-xukuohai@huaweicloud.com
parent bb0a1d6b

arch/arm64/net/bpf_jit_comp.c

+3 −2
Original line number Diff line number Diff line
@@ -855,11 +855,12 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, 
	/* dst = BSWAP##imm(dst) */

	case BPF_ALU | BPF_END | BPF_FROM_LE:

	case BPF_ALU | BPF_END | BPF_FROM_BE:

	case BPF_ALU64 | BPF_END | BPF_FROM_LE:

#ifdef CONFIG_CPU_BIG_ENDIAN

		if (BPF_SRC(code) == BPF_FROM_BE)

		if (BPF_CLASS(code) == BPF_ALU && BPF_SRC(code) == BPF_FROM_BE)

			goto emit_bswap_uxt;

#else /* !CONFIG_CPU_BIG_ENDIAN */

		if (BPF_SRC(code) == BPF_FROM_LE)

		if (BPF_CLASS(code) == BPF_ALU && BPF_SRC(code) == BPF_FROM_LE)

			goto emit_bswap_uxt;

#endif

		switch (imm) {