Re: [PATCH bpf-next v2 4/8] arm32, bpf: add support for unconditional bswap instruction

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Sep 06, 2023 at 06:33:16PM +0000, Puranjay Mohan wrote:
> @@ -1633,8 +1633,10 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
>  	/* dst = htobe(dst) */
>  	case BPF_ALU | BPF_END | BPF_FROM_LE:
>  	case BPF_ALU | BPF_END | BPF_FROM_BE:
> +	/* dst = bswap(dst) */
> +	case BPF_ALU64 | BPF_END | BPF_TO_LE:
>  		rd = arm_bpf_get_reg64(dst, tmp, ctx);
> -		if (BPF_SRC(code) == BPF_FROM_LE)
> +		if (BPF_SRC(code) == BPF_FROM_LE && BPF_CLASS(code) != BPF_ALU64)

With the addition of the BPF_ALU64 case, I'm wondering why this if() is
affected. If you were adding:

	case BPF_ALU64 | BPF_END | BPF_FROM_LE:

then maybe there would be a reason, but the BPF_ALU64 | BPF_END |
BPF_TO_LE case will never match even the original if() statement.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!



[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux