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btf_loader.c
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btf_loader.c
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/*
* btf_loader.c
*
* Copyright (C) 2018 Arnaldo Carvalho de Melo <[email protected]>
*
* Based on ctf_loader.c that, in turn, was based on ctfdump.c: CTF dumper.
*
* Copyright (C) 2008 David S. Miller <[email protected]>
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stddef.h>
#include <malloc.h>
#include <string.h>
#include <limits.h>
#include <libgen.h>
#include <linux/btf.h>
#include <bpf/btf.h>
#include <bpf/libbpf.h>
#include <zlib.h>
#include <gelf.h>
#include "dutil.h"
#include "dwarves.h"
static const char *cu__btf_str(struct cu *cu, uint32_t offset)
{
return offset ? btf__str_by_offset(cu->priv, offset) : NULL;
}
static void *tag__alloc(const size_t size)
{
struct tag *tag = zalloc(size);
if (tag != NULL)
tag->top_level = 1;
return tag;
}
static int cu__load_ftype(struct cu *cu, struct ftype *proto, uint32_t tag, const struct btf_type *tp, uint32_t id)
{
const struct btf_param *param = btf_params(tp);
int i, vlen = btf_vlen(tp);
proto->tag.tag = tag;
proto->tag.type = tp->type;
INIT_LIST_HEAD(&proto->parms);
INIT_LIST_HEAD(&proto->template_type_params);
INIT_LIST_HEAD(&proto->template_value_params);
proto->template_parameter_pack = NULL;
proto->formal_parameter_pack = NULL;
for (i = 0; i < vlen; ++i, param++) {
if (param->type == 0)
proto->unspec_parms = 1;
else {
struct parameter *p = tag__alloc(sizeof(*p));
if (p == NULL)
goto out_free_parameters;
p->tag.tag = DW_TAG_formal_parameter;
p->tag.type = param->type;
p->name = cu__btf_str(cu, param->name_off);
ftype__add_parameter(proto, p);
}
}
cu__add_tag_with_id(cu, &proto->tag, id);
return 0;
out_free_parameters:
ftype__delete(proto, cu);
return -ENOMEM;
}
static int create_new_function(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct function *func = tag__alloc(sizeof(*func));
if (func == NULL)
return -ENOMEM;
// for BTF this is not really the type of the return of the function,
// but the prototype, the return type is the one in type_id
func->btf = 1;
func->proto.tag.tag = DW_TAG_subprogram;
func->proto.tag.type = tp->type;
func->name = cu__btf_str(cu, tp->name_off);
INIT_LIST_HEAD(&func->lexblock.tags);
cu__add_tag_with_id(cu, &func->proto.tag, id);
return 0;
}
static struct base_type *base_type__new(const char *name, uint32_t attrs,
uint8_t float_type, size_t size)
{
struct base_type *bt = tag__alloc(sizeof(*bt));
if (bt != NULL) {
bt->name = name;
bt->bit_size = size;
bt->is_signed = attrs & BTF_INT_SIGNED;
bt->is_bool = attrs & BTF_INT_BOOL;
bt->name_has_encoding = false;
bt->float_type = float_type;
INIT_LIST_HEAD(&bt->node);
}
return bt;
}
static void type__init(struct type *type, uint32_t tag, const char *name, size_t size)
{
__type__init(type);
INIT_LIST_HEAD(&type->namespace.tags);
type->size = size;
type->namespace.tag.tag = tag;
type->namespace.name = name;
type->template_parameter_pack = NULL;
}
static struct type *type__new(uint16_t tag, const char *name, size_t size)
{
struct type *type = tag__alloc(sizeof(*type));
if (type != NULL)
type__init(type, tag, name, size);
return type;
}
static struct class *class__new(const char *name, size_t size, bool is_union)
{
struct class *class = tag__alloc(sizeof(*class));
uint32_t tag = is_union ? DW_TAG_union_type : DW_TAG_structure_type;
if (class != NULL) {
type__init(&class->type, tag, name, size);
INIT_LIST_HEAD(&class->vtable);
}
return class;
}
static struct variable *variable__new(const char *name, uint32_t linkage)
{
struct variable *var = tag__alloc(sizeof(*var));
if (var != NULL) {
var->external = linkage == BTF_VAR_GLOBAL_ALLOCATED;
var->name = name;
var->ip.tag.tag = DW_TAG_variable;
}
return var;
}
static int create_new_int_type(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
uint32_t attrs = btf_int_encoding(tp);
const char *name = cu__btf_str(cu, tp->name_off);
struct base_type *base = base_type__new(name, attrs, 0, btf_int_bits(tp));
if (base == NULL)
return -ENOMEM;
base->tag.tag = DW_TAG_base_type;
cu__add_tag_with_id(cu, &base->tag, id);
return 0;
}
static int create_new_float_type(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
const char *name = cu__btf_str(cu, tp->name_off);
struct base_type *base = base_type__new(name, 0, BT_FP_SINGLE, tp->size * 8);
if (base == NULL)
return -ENOMEM;
base->tag.tag = DW_TAG_base_type;
cu__add_tag_with_id(cu, &base->tag, id);
return 0;
}
static int create_new_array(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct btf_array *ap = btf_array(tp);
struct array_type *array = tag__alloc(sizeof(*array));
if (array == NULL)
return -ENOMEM;
/* FIXME: where to get the number of dimensions?
* it it flattened? */
array->dimensions = 1;
array->nr_entries = malloc(sizeof(uint32_t));
if (array->nr_entries == NULL) {
free(array);
return -ENOMEM;
}
array->nr_entries[0] = ap->nelems;
array->tag.tag = DW_TAG_array_type;
array->tag.type = ap->type;
cu__add_tag_with_id(cu, &array->tag, id);
return 0;
}
static int create_members(struct cu *cu, const struct btf_type *tp, struct type *class)
{
struct btf_member *mp = btf_members(tp);
int i, vlen = btf_vlen(tp);
for (i = 0; i < vlen; i++) {
struct class_member *member = zalloc(sizeof(*member));
if (member == NULL)
return -ENOMEM;
member->tag.tag = DW_TAG_member;
member->tag.type = mp[i].type;
member->name = cu__btf_str(cu, mp[i].name_off);
member->bit_offset = btf_member_bit_offset(tp, i);
member->bitfield_size = btf_member_bitfield_size(tp, i);
member->byte_offset = member->bit_offset / 8;
/* sizes and offsets will be corrected at class__fixup_btf_bitfields */
type__add_member(class, member);
}
return 0;
}
static int create_new_class(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct class *class = class__new(cu__btf_str(cu, tp->name_off), tp->size, false);
int member_size = create_members(cu, tp, &class->type);
if (member_size < 0)
goto out_free;
cu__add_tag_with_id(cu, &class->type.namespace.tag, id);
return 0;
out_free:
class__delete(class, cu);
return -ENOMEM;
}
static int create_new_union(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct type *un = type__new(DW_TAG_union_type, cu__btf_str(cu, tp->name_off), tp->size);
int member_size = create_members(cu, tp, un);
if (member_size < 0)
goto out_free;
cu__add_tag_with_id(cu, &un->namespace.tag, id);
return 0;
out_free:
type__delete(un, cu);
return -ENOMEM;
}
static struct enumerator *enumerator__new(const char *name, uint64_t value)
{
struct enumerator *en = tag__alloc(sizeof(*en));
if (en != NULL) {
en->name = name;
en->value = value;
en->tag.tag = DW_TAG_enumerator;
}
return en;
}
static int create_new_enumeration(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct btf_enum *ep = btf_enum(tp);
uint16_t i, vlen = btf_vlen(tp);
struct type *enumeration = type__new(DW_TAG_enumeration_type,
cu__btf_str(cu, tp->name_off),
tp->size ? tp->size * 8 : (sizeof(int) * 8));
if (enumeration == NULL)
return -ENOMEM;
enumeration->is_signed_enum = !!btf_kflag(tp);
for (i = 0; i < vlen; i++) {
const char *name = cu__btf_str(cu, ep[i].name_off);
uint64_t value = ep[i].val;
if (!enumeration->is_signed_enum)
value = (uint32_t)ep[i].val;
struct enumerator *enumerator = enumerator__new(name, value);
if (enumerator == NULL)
goto out_free;
enumeration__add(enumeration, enumerator);
}
cu__add_tag_with_id(cu, &enumeration->namespace.tag, id);
return 0;
out_free:
enumeration__delete(enumeration, cu);
return -ENOMEM;
}
#if LIBBPF_MAJOR_VERSION >= 1
static struct enumerator *enumerator__new64(const char *name, uint64_t value)
{
struct enumerator *en = tag__alloc(sizeof(*en));
if (en != NULL) {
en->name = name;
en->value = value; // Value is already 64-bit, as this is used with DWARF as well
en->tag.tag = DW_TAG_enumerator;
}
return en;
}
static int create_new_enumeration64(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct btf_enum64 *ep = btf_enum64(tp);
uint16_t i, vlen = btf_vlen(tp);
struct type *enumeration = type__new(DW_TAG_enumeration_type,
cu__btf_str(cu, tp->name_off),
tp->size ? tp->size * 8 : (sizeof(int) * 8));
if (enumeration == NULL)
return -ENOMEM;
enumeration->is_signed_enum = !!btf_kflag(tp);
for (i = 0; i < vlen; i++) {
const char *name = cu__btf_str(cu, ep[i].name_off);
uint64_t value = btf_enum64_value(&ep[i]);
struct enumerator *enumerator = enumerator__new64(name, value);
if (enumerator == NULL)
goto out_free;
enumeration__add(enumeration, enumerator);
}
cu__add_tag_with_id(cu, &enumeration->namespace.tag, id);
return 0;
out_free:
enumeration__delete(enumeration, cu);
return -ENOMEM;
}
#else
static int create_new_enumeration64(struct cu *cu __maybe_unused, const struct btf_type *tp __maybe_unused, uint32_t id __maybe_unused)
{
return -ENOTSUP;
}
#endif
static int create_new_subroutine_type(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct ftype *proto = tag__alloc(sizeof(*proto));
if (proto == NULL)
return -ENOMEM;
return cu__load_ftype(cu, proto, DW_TAG_subroutine_type, tp, id);
}
static int create_new_forward_decl(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct class *fwd = class__new(cu__btf_str(cu, tp->name_off), 0, btf_kflag(tp));
if (fwd == NULL)
return -ENOMEM;
fwd->type.declaration = 1;
cu__add_tag_with_id(cu, &fwd->type.namespace.tag, id);
return 0;
}
static int create_new_typedef(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct type *type = type__new(DW_TAG_typedef, cu__btf_str(cu, tp->name_off), 0);
if (type == NULL)
return -ENOMEM;
type->namespace.tag.type = tp->type;
cu__add_tag_with_id(cu, &type->namespace.tag, id);
return 0;
}
static int create_new_variable(struct cu *cu, const struct btf_type *tp, uint32_t id)
{
struct btf_var *bvar = btf_var(tp);
struct variable *var = variable__new(cu__btf_str(cu, tp->name_off), bvar->linkage);
if (var == NULL)
return -ENOMEM;
var->ip.tag.type = tp->type;
cu__add_tag_with_id(cu, &var->ip.tag, id);
return 0;
}
static int create_new_datasec(struct cu *cu __maybe_unused, const struct btf_type *tp __maybe_unused, uint32_t id __maybe_unused)
{
//cu__add_tag_with_id(cu, &datasec->tag, id);
/*
* FIXME: this will not be used to reconstruct some original C code,
* its about runtime placement of variables so just ignore this for now
*/
return 0;
}
static int create_new_tag(struct cu *cu, int type, const struct btf_type *tp, uint32_t id)
{
struct tag *tag = zalloc(sizeof(*tag));
if (tag == NULL)
return -ENOMEM;
switch (type) {
case BTF_KIND_CONST: tag->tag = DW_TAG_const_type; break;
case BTF_KIND_PTR: tag->tag = DW_TAG_pointer_type; break;
case BTF_KIND_RESTRICT: tag->tag = DW_TAG_restrict_type; break;
case BTF_KIND_VOLATILE: tag->tag = DW_TAG_volatile_type; break;
case BTF_KIND_TYPE_TAG: tag->tag = DW_TAG_LLVM_annotation; break;
default:
free(tag);
fprintf(stderr, "%s: Unknown type %d\n\n", __func__, type);
return 0;
}
tag->type = tp->type;
cu__add_tag_with_id(cu, tag, id);
return 0;
}
static int process_decl_tag(struct cu *cu, const struct btf_type *tp)
{
struct tag *tag = cu__type(cu, tp->type);
if (tag == NULL)
tag = cu__function(cu, tp->type);
if (tag == NULL)
tag = cu__tag(cu, tp->type);
if (tag == NULL) {
fprintf(stderr, "WARNING: BTF_KIND_DECL_TAG for unknown BTF id %d\n", tp->type);
return 0;
}
const char *attribute = cu__btf_str(cu, tp->name_off);
if (tag->attribute != NULL) {
char bf[128];
fprintf(stderr, "WARNING: still unsuported BTF_KIND_DECL_TAG(%s) for %s already with attribute (%s), ignoring\n",
attribute, tag__name(tag, cu, bf, sizeof(bf), NULL), tag->attribute);
} else {
tag->attribute = attribute;
}
return 0;
}
static int btf__load_types(struct btf *btf, struct cu *cu)
{
uint32_t type_index;
int err;
for (type_index = 1; type_index < btf__type_cnt(btf); type_index++) {
const struct btf_type *type_ptr = btf__type_by_id(btf, type_index);
uint32_t type = btf_kind(type_ptr);
switch (type) {
case BTF_KIND_INT:
err = create_new_int_type(cu, type_ptr, type_index);
break;
case BTF_KIND_ARRAY:
err = create_new_array(cu, type_ptr, type_index);
break;
case BTF_KIND_STRUCT:
err = create_new_class(cu, type_ptr, type_index);
break;
case BTF_KIND_UNION:
err = create_new_union(cu, type_ptr, type_index);
break;
case BTF_KIND_ENUM:
err = create_new_enumeration(cu, type_ptr, type_index);
break;
case BTF_KIND_ENUM64:
err = create_new_enumeration64(cu, type_ptr, type_index);
break;
case BTF_KIND_FWD:
err = create_new_forward_decl(cu, type_ptr, type_index);
break;
case BTF_KIND_TYPEDEF:
err = create_new_typedef(cu, type_ptr, type_index);
break;
case BTF_KIND_VAR:
err = create_new_variable(cu, type_ptr, type_index);
break;
case BTF_KIND_DATASEC:
err = create_new_datasec(cu, type_ptr, type_index);
break;
case BTF_KIND_VOLATILE:
case BTF_KIND_PTR:
case BTF_KIND_CONST:
case BTF_KIND_RESTRICT:
/* For type tag it's a bit of a lie.
* In DWARF it is encoded as a child tag of whatever type it
* applies to. Here we load it as a standalone tag with a pointer
* to a next type only to have a valid ID in the types table.
*/
case BTF_KIND_TYPE_TAG:
err = create_new_tag(cu, type, type_ptr, type_index);
break;
case BTF_KIND_UNKN:
cu__table_nullify_type_entry(cu, type_index);
fprintf(stderr, "BTF: idx: %d, Unknown kind %d\n", type_index, type);
fflush(stderr);
err = 0;
break;
case BTF_KIND_FUNC_PROTO:
err = create_new_subroutine_type(cu, type_ptr, type_index);
break;
case BTF_KIND_FUNC:
// BTF_KIND_FUNC corresponding to a defined subprogram.
err = create_new_function(cu, type_ptr, type_index);
break;
case BTF_KIND_FLOAT:
err = create_new_float_type(cu, type_ptr, type_index);
break;
case BTF_KIND_DECL_TAG:
err = process_decl_tag(cu, type_ptr);
break;
default:
fprintf(stderr, "BTF: idx: %d, Unknown kind %d\n", type_index, type);
fflush(stderr);
err = 0;
break;
}
if (err < 0)
return err;
}
return 0;
}
static int btf__load_sections(struct btf *btf, struct cu *cu)
{
return btf__load_types(btf, cu);
}
static uint32_t class__infer_alignment(const struct conf_load *conf,
uint32_t byte_offset,
uint32_t natural_alignment,
uint32_t smallest_offset)
{
uint16_t cacheline_size = conf->conf_fprintf->cacheline_size;
uint32_t alignment = 0;
uint32_t offset_delta = byte_offset - smallest_offset;
if (offset_delta) {
if (byte_offset % 2 == 0) {
/* Find the power of 2 immediately higher than
* offset_delta
*/
alignment = 1 << (8 * sizeof(offset_delta) -
__builtin_clz(offset_delta));
} else {
alignment = 0;
}
}
/* Natural alignment, nothing to do */
if (alignment <= natural_alignment || alignment == 1)
alignment = 0;
/* If the offset is compatible with being aligned on the cacheline size
* and this would only result in increasing the alignment, use the
* cacheline size as it is safe and quite likely to be what was in the
* source.
*/
else if (alignment < cacheline_size &&
cacheline_size % alignment == 0 &&
byte_offset % cacheline_size == 0)
alignment = cacheline_size;
return alignment;
}
static int class__fixup_btf_bitfields(const struct conf_load *conf, struct tag *tag, struct cu *cu)
{
struct class_member *pos;
struct type *tag_type = tag__type(tag);
uint32_t smallest_offset = 0;
type__for_each_data_member(tag_type, pos) {
struct tag *type = tag__strip_typedefs_and_modifiers(&pos->tag, cu);
if (type == NULL) /* FIXME: C++ BTF... */
continue;
pos->bitfield_offset = 0;
pos->byte_size = tag__size(type, cu);
pos->bit_size = pos->byte_size * 8;
/* if BTF data is incorrect and has size == 0, skip field,
* instead of crashing */
if (pos->byte_size == 0) {
continue;
}
/* bitfield fixup is needed for enums and base types only */
if (type->tag == DW_TAG_base_type || type->tag == DW_TAG_enumeration_type) {
if (pos->bitfield_size) {
/* bitfields seem to be always aligned, no matter the packing */
pos->byte_offset = pos->bit_offset / pos->bit_size * pos->bit_size / 8;
pos->bitfield_offset = pos->bit_offset - pos->byte_offset * 8;
/* re-adjust bitfield offset if it is negative */
if (pos->bitfield_offset < 0) {
pos->bitfield_offset += pos->bit_size;
pos->byte_offset -= pos->byte_size;
pos->bit_offset = pos->byte_offset * 8 + pos->bitfield_offset;
}
} else {
pos->byte_offset = pos->bit_offset / 8;
}
}
pos->alignment = class__infer_alignment(conf,
pos->byte_offset,
tag__natural_alignment(type, cu),
smallest_offset);
smallest_offset = pos->byte_offset + pos->byte_size;
}
tag_type->alignment = class__infer_alignment(conf,
tag_type->size,
tag__natural_alignment(tag, cu),
smallest_offset);
return 0;
}
static int cu__fixup_btf_bitfields(const struct conf_load *conf, struct cu *cu)
{
int err = 0;
struct tag *pos;
list_for_each_entry(pos, &cu->tags, node)
if (tag__is_struct(pos) || tag__is_union(pos)) {
err = class__fixup_btf_bitfields(conf, pos, cu);
if (err)
break;
}
return err;
}
static void btf__cu_delete(struct cu *cu)
{
btf__free(cu->priv);
cu->priv = NULL;
}
static int libbpf_log(enum libbpf_print_level level __maybe_unused, const char *format, va_list args)
{
return vfprintf(stderr, format, args);
}
struct debug_fmt_ops btf__ops;
static int cus__load_btf(struct cus *cus, struct conf_load *conf, const char *filename)
{
int err = -1;
// Pass a zero for addr_size, we'll get it after we load via btf__pointer_size()
struct cu *cu = cu__new(filename, 0, NULL, 0, filename, false);
if (cu == NULL)
return -1;
cu->language = LANG_C;
cu->uses_global_strings = false;
cu->dfops = &btf__ops;
libbpf_set_print(libbpf_log);
struct btf *btf = btf__parse_split(filename, conf->base_btf);
err = libbpf_get_error(btf);
if (err)
goto out_free;
cu->priv = btf;
cu->little_endian = btf__endianness(btf) == BTF_LITTLE_ENDIAN;
cu->addr_size = btf__pointer_size(btf);
err = btf__load_sections(btf, cu);
if (err != 0)
goto out_free;
err = cu__fixup_btf_bitfields(conf, cu);
/*
* The app stole this cu, possibly deleting it,
* so forget about it
*/
if (conf && conf->steal && conf->steal(cu, conf, NULL))
return 0;
cus__add(cus, cu);
return err;
out_free:
cu__delete(cu); // will call btf__free(cu->priv);
return err;
}
struct debug_fmt_ops btf__ops = {
.name = "btf",
.load_file = cus__load_btf,
.cu__delete = btf__cu_delete,
};