tools/libbpf: support bigger BTF data sizes
While it's understandable why kernel limits number of BTF types to 65535 and size of string section to 64KB, in libbpf as user-space library it's too restrictive. E.g., pahole converting DWARF to BTF type information for Linux kernel generates more than 3 million BTF types and more than 3MB of strings, before deduplication. So to allow btf__dedup() to do its work, we need to be able to load bigger BTF sections using btf__new(). Singed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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5aab392c55
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@ -16,7 +16,8 @@
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#define max(a, b) ((a) > (b) ? (a) : (b))
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#define BTF_MAX_NR_TYPES 65535
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#define BTF_MAX_NR_TYPES 0x7fffffff
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#define BTF_MAX_STR_OFFSET 0x7fffffff
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#define IS_MODIFIER(k) (((k) == BTF_KIND_TYPEDEF) || \
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((k) == BTF_KIND_VOLATILE) || \
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@ -175,7 +176,7 @@ static int btf_parse_str_sec(struct btf *btf)
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const char *start = btf->nohdr_data + hdr->str_off;
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const char *end = start + btf->hdr->str_len;
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if (!hdr->str_len || hdr->str_len - 1 > BTF_MAX_NAME_OFFSET ||
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if (!hdr->str_len || hdr->str_len - 1 > BTF_MAX_STR_OFFSET ||
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start[0] || end[-1]) {
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pr_debug("Invalid BTF string section\n");
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return -EINVAL;
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@ -1882,7 +1883,7 @@ static int btf_dedup_prim_types(struct btf_dedup *d)
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*/
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static inline bool is_type_mapped(struct btf_dedup *d, uint32_t type_id)
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{
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return d->map[type_id] <= BTF_MAX_TYPE;
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return d->map[type_id] <= BTF_MAX_NR_TYPES;
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}
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/*
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@ -2033,7 +2034,7 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
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canon_id = resolve_fwd_id(d, canon_id);
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hypot_type_id = d->hypot_map[canon_id];
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if (hypot_type_id <= BTF_MAX_TYPE)
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if (hypot_type_id <= BTF_MAX_NR_TYPES)
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return hypot_type_id == cand_id;
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if (btf_dedup_hypot_map_add(d, canon_id, cand_id))
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@ -2252,7 +2253,7 @@ static int btf_dedup_struct_type(struct btf_dedup *d, __u32 type_id)
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__u32 h;
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/* already deduped or is in process of deduping (loop detected) */
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if (d->map[type_id] <= BTF_MAX_TYPE)
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if (d->map[type_id] <= BTF_MAX_NR_TYPES)
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return 0;
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t = d->btf->types[type_id];
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@ -2329,7 +2330,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
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if (d->map[type_id] == BTF_IN_PROGRESS_ID)
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return -ELOOP;
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if (d->map[type_id] <= BTF_MAX_TYPE)
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if (d->map[type_id] <= BTF_MAX_NR_TYPES)
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return resolve_type_id(d, type_id);
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t = d->btf->types[type_id];
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@ -2509,7 +2510,7 @@ static int btf_dedup_remap_type_id(struct btf_dedup *d, __u32 type_id)
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resolved_type_id = resolve_type_id(d, type_id);
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new_type_id = d->hypot_map[resolved_type_id];
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if (new_type_id > BTF_MAX_TYPE)
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if (new_type_id > BTF_MAX_NR_TYPES)
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return -EINVAL;
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return new_type_id;
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}
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