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libbpf: Support opening bpf objects of either endianness

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Allow bpf_object__open() to access files of either endianness, and convert
included BPF programs to native byte-order in-memory for introspection.
Loading BPF objects of non-native byte-order is still disallowed however.

Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/26353c1a1887a54400e1acd6c138fa90c99cdd40.1726475448.git.tony.ambardar@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tony Ambardar
2024-09-16 01:37:44 -07:00
committed by Andrii Nakryiko
parent 5ae8432d15
commit 628b21dbcd
2 changed files with 52 additions and 9 deletions
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10
src/libbpf_internal.h
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@@ -617,6 +617,16 @@ static inline bool is_ldimm64_insn(struct bpf_insn *insn)
return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
}
static inline void bpf_insn_bswap(struct bpf_insn *insn)
{
__u8 tmp_reg = insn->dst_reg;
insn->dst_reg = insn->src_reg;
insn->src_reg = tmp_reg;
insn->off = bswap_16(insn->off);
insn->imm = bswap_32(insn->imm);
}
/* Unconditionally dup FD, ensuring it doesn't use [0, 2] range.
* Original FD is not closed or altered in any other way.
* Preserves original FD value, if it's invalid (negative).