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bpf: btf: refactor btf_int_bits_seq_show() 

Refactor function btf_int_bits_seq_show() by creating
function btf_bitfield_seq_show() which has no dependence
on btf and btf_type. The function btf_bitfield_seq_show()
will be in later patch to directly dump bitfield member values.

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Yonghong Song 2018-12-15 22:13:50 -08:00 committed by Daniel Borkmann
parent 6c4fc209fc
commit f97be3ab04
1 changed files with 21 additions and 14 deletions
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35
kernel/bpf/btf.c
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@ -1068,26 +1068,16 @@ static void btf_int_log(struct btf_verifier_env *env,
btf_int_encoding_str(BTF_INT_ENCODING(int_data)));
}
static void btf_int_bits_seq_show(const struct btf *btf,
const struct btf_type *t,
void *data, u8 bits_offset,
struct seq_file *m)
static void btf_bitfield_seq_show(void *data, u8 bits_offset,
u8 nr_bits, struct seq_file *m)
{
u16 left_shift_bits, right_shift_bits;
u32 int_data = btf_type_int(t);
u8 nr_bits = BTF_INT_BITS(int_data);
u8 total_bits_offset;
u8 nr_copy_bytes;
u8 nr_copy_bits;
u64 print_num;
/*
* bits_offset is at most 7.
* BTF_INT_OFFSET() cannot exceed 64 bits.
*/
total_bits_offset = bits_offset + BTF_INT_OFFSET(int_data);
data += BITS_ROUNDDOWN_BYTES(total_bits_offset);
bits_offset = BITS_PER_BYTE_MASKED(total_bits_offset);
data += BITS_ROUNDDOWN_BYTES(bits_offset);
bits_offset = BITS_PER_BYTE_MASKED(bits_offset);
nr_copy_bits = nr_bits + bits_offset;
nr_copy_bytes = BITS_ROUNDUP_BYTES(nr_copy_bits);
@ -1107,6 +1097,23 @@ static void btf_int_bits_seq_show(const struct btf *btf,
seq_printf(m, "0x%llx", print_num);
}
static void btf_int_bits_seq_show(const struct btf *btf,
const struct btf_type *t,
void *data, u8 bits_offset,
struct seq_file *m)
{
u32 int_data = btf_type_int(t);
u8 nr_bits = BTF_INT_BITS(int_data);
u8 total_bits_offset;
/*
* bits_offset is at most 7.
* BTF_INT_OFFSET() cannot exceed 64 bits.
*/
total_bits_offset = bits_offset + BTF_INT_OFFSET(int_data);
btf_bitfield_seq_show(data, total_bits_offset, nr_bits, m);
}
static void btf_int_seq_show(const struct btf *btf, const struct btf_type *t,
u32 type_id, void *data, u8 bits_offset,
struct seq_file *m)