// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2019 Facebook */
#include <errno.h>
#include <fcntl.h>
#include <linux/err.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <bpf/bpf.h>
#include <bpf/btf.h>
#include <bpf/libbpf.h>
#include <linux/btf.h>
#include <linux/hashtable.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "json_writer.h"
#include "main.h"
static const char * const btf_kind_str[NR_BTF_KINDS] = {
[BTF_KIND_UNKN] = "UNKNOWN",
[BTF_KIND_INT] = "INT",
[BTF_KIND_PTR] = "PTR",
[BTF_KIND_ARRAY] = "ARRAY",
[BTF_KIND_STRUCT] = "STRUCT",
[BTF_KIND_UNION] = "UNION",
[BTF_KIND_ENUM] = "ENUM",
[BTF_KIND_FWD] = "FWD",
[BTF_KIND_TYPEDEF] = "TYPEDEF",
[BTF_KIND_VOLATILE] = "VOLATILE",
[BTF_KIND_CONST] = "CONST",
[BTF_KIND_RESTRICT] = "RESTRICT",
[BTF_KIND_FUNC] = "FUNC",
[BTF_KIND_FUNC_PROTO] = "FUNC_PROTO",
[BTF_KIND_VAR] = "VAR",
[BTF_KIND_DATASEC] = "DATASEC",
};
struct btf_attach_table {
DECLARE_HASHTABLE(table, 16);
};
struct btf_attach_point {
__u32 obj_id;
__u32 btf_id;
struct hlist_node hash;
};
static const char *btf_int_enc_str(__u8 encoding)
{
switch (encoding) {
case 0:
return "(none)";
case BTF_INT_SIGNED:
return "SIGNED";
case BTF_INT_CHAR:
return "CHAR";
case BTF_INT_BOOL:
return "BOOL";
default:
return "UNKN";
}
}
static const char *btf_var_linkage_str(__u32 linkage)
{
switch (linkage) {
case BTF_VAR_STATIC:
return "static";
case BTF_VAR_GLOBAL_ALLOCATED:
return "global-alloc";
default:
return "(unknown)";
}
}
static const char *btf_func_linkage_str(const struct btf_type *t)
{
switch (btf_vlen(t)) {
case BTF_FUNC_STATIC:
return "static";
case BTF_FUNC_GLOBAL:
return "global";
case BTF_FUNC_EXTERN:
return "extern";
default:
return "(unknown)";
}
}
static const char *btf_str(const struct btf *btf, __u32 off)
{
if (!off)
return "(anon)";
return btf__name_by_offset(btf, off) ? : "(invalid)";
}
static int dump_btf_type(const struct btf *btf, __u32 id,
const struct btf_type *t)
{
json_writer_t *w = json_wtr;
int kind, safe_kind;
kind = BTF_INFO_KIND(t->info);
safe_kind = kind <= BTF_KIND_MAX ? kind : BTF_KIND_UNKN;
if (json_output) {
jsonw_start_object(w);
jsonw_uint_field(w, "id", id);
jsonw_string_field(w, "kind", btf_kind_str[safe_kind]);
jsonw_string_field(w, "name", btf_str(btf, t->name_off));
} else {
printf("[%u] %s '%s'", id, btf_kind_str[safe_kind],
btf_str(btf, t->name_off));
}
switch (BTF_INFO_KIND(t->info)) {
case BTF_KIND_INT: {
__u32 v = *(__u32 *)(t + 1);
const char *enc;
enc = btf_int_enc_str(BTF_INT_ENCODING(v));
if (json_output) {
jsonw_uint_field(w, "size", t->size);
jsonw_uint_field(w, "bits_offset", BTF_INT_OFFSET(v));
jsonw_uint_field(w, "nr_bits", BTF_INT_BITS(v));
jsonw_string_field(w, "encoding", enc);
} else {
printf(" size=%u bits_offset=%u nr_bits=%u encoding=%s",
t->size, BTF_INT_OFFSET(v), BTF_INT_BITS(v),
enc);
}
break;
}
case BTF_KIND_PTR:
case BTF_KIND_CONST:
case BTF_KIND_VOLATILE:
case BTF_KIND_RESTRICT:
case BTF_KIND_TYPEDEF:
if (json_output)
jsonw_uint_field(w, "type_id", t->type);
else