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bpf, arm64: Support unconditional bswap

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Add JIT support for unconditional bswap instructions.

Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Florent Revest <revest@chromium.org>
Acked-by: Florent Revest <revest@chromium.org>
Link: https://lore.kernel.org/bpf/20230815154158.717901-5-xukuohai@huaweicloud.com
This commit is contained in:
Xu Kuohai 2023-08-15 11:41:55 -04:00 • committed by Daniel Borkmann
parent bb0a1d6b49
commit 1104247f3f
1 changed files with 3 additions and 2 deletions
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5
arch/arm64/net/bpf_jit_comp.c
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@ -855,11 +855,12 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
/* dst = BSWAP##imm(dst) */ /* dst = BSWAP##imm(dst) */
case BPF_ALU | BPF_END | BPF_FROM_LE: case BPF_ALU | BPF_END | BPF_FROM_LE:
case BPF_ALU | BPF_END | BPF_FROM_BE: case BPF_ALU | BPF_END | BPF_FROM_BE:
case BPF_ALU64 | BPF_END | BPF_FROM_LE:
#ifdef CONFIG_CPU_BIG_ENDIAN #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; goto emit_bswap_uxt;
#else /* !CONFIG_CPU_BIG_ENDIAN */ #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; goto emit_bswap_uxt;
#endif #endif
switch (imm) { switch (imm) {