[PATCH v3 02/13] arm64: bpf: Remove big-endian support from the JIT compiler
From: Will Deacon <will@kernel.org>
Date: 2026-09-18 14:52:39
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), bpf jit for arm64, bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Catalin Marinas, Will Deacon, Daniel Borkmann, Alexei Starovoitov, Puranjay Mohan, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
Big-endian support on arm64 depends on BROKEN. In preparation for removing the dead code altogether, remove the big-endian-specific support from the arm64 BPF JIT backend. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Marc Zyngier <maz@kernel.org> Acked-by: Eric Biggers <ebiggers@kernel.org> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> --- arch/arm64/net/bpf_jit_comp.c | 11 ----------- 1 file changed, 11 deletions(-)
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index c18e005a41db..a5634428fdd5 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c@@ -1439,13 +1439,8 @@ static int build_insn(const struct bpf_verifier_env *env, const struct bpf_insn 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_CLASS(code) == BPF_ALU && BPF_SRC(code) == BPF_FROM_BE) - goto emit_bswap_uxt; -#else /* !CONFIG_CPU_BIG_ENDIAN */ if (BPF_CLASS(code) == BPF_ALU && BPF_SRC(code) == BPF_FROM_LE) goto emit_bswap_uxt; -#endif switch (imm) { case 16: emit(A64_REV16(is64, dst, dst), ctx);
@@ -2559,15 +2554,9 @@ static void clear_garbage(struct jit_ctx *ctx, int reg, int effective_bytes) { if (effective_bytes) { int garbage_bits = 64 - 8 * effective_bytes; -#ifdef CONFIG_CPU_BIG_ENDIAN - /* garbage bits are at the right end */ - emit(A64_LSR(1, reg, reg, garbage_bits), ctx); - emit(A64_LSL(1, reg, reg, garbage_bits), ctx); -#else /* garbage bits are at the left end */ emit(A64_LSL(1, reg, reg, garbage_bits), ctx); emit(A64_LSR(1, reg, reg, garbage_bits), ctx); -#endif } }
--
2.55.0.1082.g2b9226bbc0-goog