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| author | Puranjay Mohan <puranjay12@gmail.com> | 2023-09-08 02:05:45 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-09-16 03:16:56 +0300 |
| commit | 1cfb7eaebeac9270fcb527f47bbdea34ca3cd5b2 (patch) | |
| tree | beb7d8d689f669b5eb31d4e24dd55612ea7c0402 /arch/arm/net | |
| parent | fc832653fa0dba174bf8fee9db85f3f9d1450b8a (diff) | |
| download | linux-1cfb7eaebeac9270fcb527f47bbdea34ca3cd5b2.tar.xz | |
arm32, bpf: add support for unconditional bswap instruction
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>
Link: https://lore.kernel.org/r/20230907230550.1417590-5-puranjay12@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch/arm/net')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index 29a1ccf761fd..a08eba850ddf 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -1635,10 +1635,12 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) break; /* dst = htole(dst) */ /* dst = htobe(dst) */ - case BPF_ALU | BPF_END | BPF_FROM_LE: - case BPF_ALU | BPF_END | BPF_FROM_BE: + case BPF_ALU | BPF_END | BPF_FROM_LE: /* also BPF_TO_LE */ + case BPF_ALU | BPF_END | BPF_FROM_BE: /* also BPF_TO_BE */ + /* dst = bswap(dst) */ + case BPF_ALU64 | BPF_END | BPF_FROM_LE: /* also 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) goto emit_bswap_uxt; switch (imm) { case 16: |