Re: [PATCH bpf-next v3 4/9] arm32, bpf: add support for unconditional bswap instruction

On Thu, Sep 07, 2023 at 11:05:45PM +0000, Puranjay Mohan wrote:

The cpuv4 added a new unconditional bswap instruction with following behaviour:

BPF_ALU64 | BPF_TO_LE | BPF_END with imm = 16/32/64 means: dst = bswap16(dst) dst = bswap32(dst) dst = bswap64(dst)

As we already support converting to big-endian from little-endian we can use the same for unconditional bswap. just treat the unconditional scenario the same as big-endian conversion.

Signed-off-by: Puranjay Mohan puranjay12@gmail.com

Reviewed-by: Russell King (Oracle) rmk+kernel@armlinux.org.uk

Thanks!