On big-endian arches not only bytes, but also bits are numbered in reverse order (see e.g. S/390 ELF ABI Supplement, but this is also true for other big-endian arches as well). Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx> --- tools/lib/bpf/btf_dump.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index ad6df97295ae..ab45771d0cb4 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -1577,14 +1577,15 @@ static int btf_dump_get_bitfield_value(struct btf_dump *d, /* Bitfield value retrieval is done in two steps; first relevant bytes are * stored in num, then we left/right shift num to eliminate irrelevant bits. */ - nr_copy_bits = bit_sz + bits_offset; nr_copy_bytes = t->size; #if __BYTE_ORDER == __LITTLE_ENDIAN for (i = nr_copy_bytes - 1; i >= 0; i--) num = num * 256 + bytes[i]; + nr_copy_bits = bit_sz + bits_offset; #elif __BYTE_ORDER == __BIG_ENDIAN for (i = 0; i < nr_copy_bytes; i++) num = num * 256 + bytes[i]; + nr_copy_bits = nr_copy_bytes * 8 - bits_offset; #else # error "Unrecognized __BYTE_ORDER__" #endif -- 2.31.1
