621 lines
26 KiB
C
621 lines
26 KiB
C
/* CTF format description.
|
|
Copyright (C) 2019-2022 Free Software Foundation, Inc.
|
|
|
|
This file is part of libctf.
|
|
|
|
libctf is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
This program is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; see the file COPYING. If not see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _CTF_H
|
|
#define _CTF_H
|
|
|
|
#include <sys/types.h>
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
/* CTF - Compact ANSI-C Type Format
|
|
|
|
This file format can be used to compactly represent the information needed
|
|
by a debugger to interpret the ANSI-C types used by a given program.
|
|
Traditionally, this kind of information is generated by the compiler when
|
|
invoked with the -g flag and is stored in "stabs" strings or in the more
|
|
modern DWARF format. CTF provides a representation of only the information
|
|
that is relevant to debugging a complex, optimized C program such as the
|
|
operating system kernel in a form that is significantly more compact than
|
|
the equivalent stabs or DWARF representation. The format is data-model
|
|
independent, so consumers do not need different code depending on whether
|
|
they are 32-bit or 64-bit programs; libctf automatically compensates for
|
|
endianness variations. CTF assumes that a standard ELF symbol table is
|
|
available for use in the debugger, and uses the structure and data of the
|
|
symbol table to avoid storing redundant information. The CTF data may be
|
|
compressed on disk or in memory, indicated by a bit in the header. CTF may
|
|
be interpreted in a raw disk file, or it may be stored in an ELF section,
|
|
typically named .ctf. Data structures are aligned so that a raw CTF file or
|
|
CTF ELF section may be manipulated using mmap(2).
|
|
|
|
The CTF file or section itself has the following structure:
|
|
|
|
+--------+--------+---------+----------+--------+----------+...
|
|
| file | type | data | function | object | function |...
|
|
| header | labels | objects | info | index | index |...
|
|
+--------+--------+---------+----------+--------+----------+...
|
|
|
|
...+----------+-------+--------+
|
|
...| variable | data | string |
|
|
...| info | types | table |
|
|
+----------+-------+--------+
|
|
|
|
The file header stores a magic number and version information, encoding
|
|
flags, and the byte offset of each of the sections relative to the end of the
|
|
header itself. If the CTF data has been uniquified against another set of
|
|
CTF data, a reference to that data also appears in the the header. This
|
|
reference is the name of the label corresponding to the types uniquified
|
|
against.
|
|
|
|
Following the header is a list of labels, used to group the types included in
|
|
the data types section. Each label is accompanied by a type ID i. A given
|
|
label refers to the group of types whose IDs are in the range [0, i].
|
|
|
|
Data object and function records (collectively, "symtypetabs") are stored in
|
|
the same order as they appear in the corresponding symbol table, except that
|
|
symbols marked SHN_UNDEF are not stored and symbols that have no type data
|
|
are padded out with zeroes. For each entry in these tables, the type ID (a
|
|
small integer) is recorded. (Functions get CTF_K_FUNCTION types, just like
|
|
data objects that are function pointers.)
|
|
|
|
For situations in which the order of the symbols in the symtab is not known,
|
|
or most symbols have no type in this dict and most entries would be
|
|
zero-pads, a pair of optional indexes follow the data object and function
|
|
info sections: each of these is an array of strtab indexes, mapped 1:1 to the
|
|
corresponding data object / function info section, giving each entry in those
|
|
sections a name so that the linker can correlate them with final symtab
|
|
entries and reorder them accordingly (dropping the indexes in the process).
|
|
|
|
Variable records (as distinct from data objects) provide a modicum of support
|
|
for non-ELF systems, mapping a variable name to a CTF type ID. The variable
|
|
names are sorted into ASCIIbetical order, permitting binary searching. We do
|
|
not define how the consumer maps these variable names to addresses or
|
|
anything else, or indeed what these names represent: they might be names
|
|
looked up at runtime via dlsym() or names extracted at runtime by a debugger
|
|
or anything else the consumer likes. Variable records with identically-
|
|
named entries in the data object section are removed.
|
|
|
|
The data types section is a list of variable size records that represent each
|
|
type, in order by their ID. The types themselves form a directed graph,
|
|
where each node may contain one or more outgoing edges to other type nodes,
|
|
denoted by their ID. Most type nodes are standalone or point backwards to
|
|
earlier nodes, but this is not required: nodes can point to later nodes,
|
|
particularly structure and union members.
|
|
|
|
Strings are recorded as a string table ID (0 or 1) and a byte offset into the
|
|
string table. String table 0 is the internal CTF string table. String table
|
|
1 is the external string table, which is the string table associated with the
|
|
ELF dynamic symbol table for this object. CTF does not record any strings
|
|
that are already in the symbol table, and the CTF string table does not
|
|
contain any duplicated strings.
|
|
|
|
If the CTF data has been merged with another parent CTF object, some outgoing
|
|
edges may refer to type nodes that exist in another CTF object. The debugger
|
|
and libctf library are responsible for connecting the appropriate objects
|
|
together so that the full set of types can be explored and manipulated.
|
|
|
|
This connection is done purely using the ctf_import() function. The
|
|
ctf_archive machinery (and thus ctf_open et al) automatically imports archive
|
|
members named ".ctf" into child dicts if available in the same archive, to
|
|
match the relationship set up by the linker, but callers can call ctf_import
|
|
themselves as well if need be, if they know a different relationship is in
|
|
force. */
|
|
|
|
#define CTF_MAX_TYPE 0xfffffffe /* Max type identifier value. */
|
|
#define CTF_MAX_PTYPE 0x7fffffff /* Max parent type identifier value. */
|
|
#define CTF_MAX_NAME 0x7fffffff /* Max offset into a string table. */
|
|
#define CTF_MAX_VLEN 0xffffff /* Max struct, union, enum members or args. */
|
|
|
|
/* See ctf_type_t */
|
|
#define CTF_MAX_SIZE 0xfffffffe /* Max size of a v2 type in bytes. */
|
|
#define CTF_LSIZE_SENT 0xffffffff /* Sentinel for v2 ctt_size. */
|
|
|
|
# define CTF_MAX_TYPE_V1 0xffff /* Max type identifier value. */
|
|
# define CTF_MAX_PTYPE_V1 0x7fff /* Max parent type identifier value. */
|
|
# define CTF_MAX_VLEN_V1 0x3ff /* Max struct, union, enums or args. */
|
|
# define CTF_MAX_SIZE_V1 0xfffe /* Max size of a type in bytes. */
|
|
# define CTF_LSIZE_SENT_V1 0xffff /* Sentinel for v1 ctt_size. */
|
|
|
|
/* Start of actual data structure definitions.
|
|
|
|
Every field in these structures must have corresponding code in the
|
|
endianness-swapping machinery in libctf/ctf-open.c. */
|
|
|
|
typedef struct ctf_preamble
|
|
{
|
|
unsigned short ctp_magic; /* Magic number (CTF_MAGIC). */
|
|
unsigned char ctp_version; /* Data format version number (CTF_VERSION). */
|
|
unsigned char ctp_flags; /* Flags (see below). */
|
|
} ctf_preamble_t;
|
|
|
|
typedef struct ctf_header_v2
|
|
{
|
|
ctf_preamble_t cth_preamble;
|
|
uint32_t cth_parlabel; /* Ref to name of parent lbl uniq'd against. */
|
|
uint32_t cth_parname; /* Ref to basename of parent. */
|
|
uint32_t cth_lbloff; /* Offset of label section. */
|
|
uint32_t cth_objtoff; /* Offset of object section. */
|
|
uint32_t cth_funcoff; /* Offset of function section. */
|
|
uint32_t cth_varoff; /* Offset of variable section. */
|
|
uint32_t cth_typeoff; /* Offset of type section. */
|
|
uint32_t cth_stroff; /* Offset of string section. */
|
|
uint32_t cth_strlen; /* Length of string section in bytes. */
|
|
} ctf_header_v2_t;
|
|
|
|
typedef struct ctf_header
|
|
{
|
|
ctf_preamble_t cth_preamble;
|
|
uint32_t cth_parlabel; /* Ref to name of parent lbl uniq'd against. */
|
|
uint32_t cth_parname; /* Ref to basename of parent. */
|
|
uint32_t cth_cuname; /* Ref to CU name (may be 0). */
|
|
uint32_t cth_lbloff; /* Offset of label section. */
|
|
uint32_t cth_objtoff; /* Offset of object section. */
|
|
uint32_t cth_funcoff; /* Offset of function section. */
|
|
uint32_t cth_objtidxoff; /* Offset of object index section. */
|
|
uint32_t cth_funcidxoff; /* Offset of function index section. */
|
|
uint32_t cth_varoff; /* Offset of variable section. */
|
|
uint32_t cth_typeoff; /* Offset of type section. */
|
|
uint32_t cth_stroff; /* Offset of string section. */
|
|
uint32_t cth_strlen; /* Length of string section in bytes. */
|
|
} ctf_header_t;
|
|
|
|
#define cth_magic cth_preamble.ctp_magic
|
|
#define cth_version cth_preamble.ctp_version
|
|
#define cth_flags cth_preamble.ctp_flags
|
|
|
|
#define CTF_MAGIC 0xdff2 /* Magic number identifying header. */
|
|
|
|
/* Data format version number. */
|
|
|
|
/* v1 upgraded to a later version is not quite the same as the native form,
|
|
because the boundary between parent and child types is different but not
|
|
recorded anywhere, and you can write it out again via ctf_compress_write(),
|
|
so we must track whether the thing was originally v1 or not. If we were
|
|
writing the header from scratch, we would add a *pair* of version number
|
|
fields to allow for this, but this will do for now. (A flag will not do,
|
|
because we need to encode both the version we came from and the version we
|
|
went to, not just "we were upgraded".) */
|
|
|
|
# define CTF_VERSION_1 1
|
|
# define CTF_VERSION_1_UPGRADED_3 2
|
|
# define CTF_VERSION_2 3
|
|
|
|
#define CTF_VERSION_3 4
|
|
#define CTF_VERSION CTF_VERSION_3 /* Current version. */
|
|
|
|
/* All of these flags bar CTF_F_COMPRESS and CTF_F_IDXSORTED are bug-workaround
|
|
flags and are valid only in format v3: in v2 and below they cannot occur and
|
|
in v4 and later, they will be recycled for other purposes. */
|
|
|
|
#define CTF_F_COMPRESS 0x1 /* Data buffer is compressed by libctf. */
|
|
#define CTF_F_NEWFUNCINFO 0x2 /* New v3 func info section format. */
|
|
#define CTF_F_IDXSORTED 0x4 /* Index sections already sorted. */
|
|
#define CTF_F_DYNSTR 0x8 /* Strings come from .dynstr. */
|
|
#define CTF_F_MAX (CTF_F_COMPRESS | CTF_F_NEWFUNCINFO | CTF_F_IDXSORTED \
|
|
| CTF_F_DYNSTR)
|
|
|
|
typedef struct ctf_lblent
|
|
{
|
|
uint32_t ctl_label; /* Ref to name of label. */
|
|
uint32_t ctl_type; /* Last type associated with this label. */
|
|
} ctf_lblent_t;
|
|
|
|
typedef struct ctf_varent
|
|
{
|
|
uint32_t ctv_name; /* Reference to name in string table. */
|
|
uint32_t ctv_type; /* Index of type of this variable. */
|
|
} ctf_varent_t;
|
|
|
|
/* In format v2, type sizes, measured in bytes, come in two flavours. Nearly
|
|
all of them fit into a (UINT_MAX - 1), and thus can be stored in the ctt_size
|
|
member of a ctf_stype_t. The maximum value for these sizes is CTF_MAX_SIZE.
|
|
Types larger than this must be stored in the ctf_lsize member of a
|
|
ctf_type_t. Use of this member is indicated by the presence of
|
|
CTF_LSIZE_SENT in ctt_size. */
|
|
|
|
/* In v1, the same applies, only the limit is (USHRT_MAX - 1) and
|
|
CTF_MAX_SIZE_V1, and CTF_LSIZE_SENT_V1 is the sentinel. */
|
|
|
|
typedef struct ctf_stype_v1
|
|
{
|
|
uint32_t ctt_name; /* Reference to name in string table. */
|
|
unsigned short ctt_info; /* Encoded kind, variant length (see below). */
|
|
#ifndef __GNUC__
|
|
union
|
|
{
|
|
unsigned short _size; /* Size of entire type in bytes. */
|
|
unsigned short _type; /* Reference to another type. */
|
|
} _u;
|
|
#else
|
|
__extension__
|
|
union
|
|
{
|
|
unsigned short ctt_size; /* Size of entire type in bytes. */
|
|
unsigned short ctt_type; /* Reference to another type. */
|
|
};
|
|
#endif
|
|
} ctf_stype_v1_t;
|
|
|
|
typedef struct ctf_type_v1
|
|
{
|
|
uint32_t ctt_name; /* Reference to name in string table. */
|
|
unsigned short ctt_info; /* Encoded kind, variant length (see below). */
|
|
#ifndef __GNUC__
|
|
union
|
|
{
|
|
unsigned short _size; /* Always CTF_LSIZE_SENT_V1. */
|
|
unsigned short _type; /* Do not use. */
|
|
} _u;
|
|
#else
|
|
__extension__
|
|
union
|
|
{
|
|
unsigned short ctt_size; /* Always CTF_LSIZE_SENT_V1. */
|
|
unsigned short ctt_type; /* Do not use. */
|
|
};
|
|
#endif
|
|
uint32_t ctt_lsizehi; /* High 32 bits of type size in bytes. */
|
|
uint32_t ctt_lsizelo; /* Low 32 bits of type size in bytes. */
|
|
} ctf_type_v1_t;
|
|
|
|
|
|
typedef struct ctf_stype
|
|
{
|
|
uint32_t ctt_name; /* Reference to name in string table. */
|
|
uint32_t ctt_info; /* Encoded kind, variant length (see below). */
|
|
#ifndef __GNUC__
|
|
union
|
|
{
|
|
uint32_t _size; /* Size of entire type in bytes. */
|
|
uint32_t _type; /* Reference to another type. */
|
|
} _u;
|
|
#else
|
|
__extension__
|
|
union
|
|
{
|
|
uint32_t ctt_size; /* Size of entire type in bytes. */
|
|
uint32_t ctt_type; /* Reference to another type. */
|
|
};
|
|
#endif
|
|
} ctf_stype_t;
|
|
|
|
typedef struct ctf_type
|
|
{
|
|
uint32_t ctt_name; /* Reference to name in string table. */
|
|
uint32_t ctt_info; /* Encoded kind, variant length (see below). */
|
|
#ifndef __GNUC__
|
|
union
|
|
{
|
|
uint32_t _size; /* Always CTF_LSIZE_SENT. */
|
|
uint32_t _type; /* Do not use. */
|
|
} _u;
|
|
#else
|
|
__extension__
|
|
union
|
|
{
|
|
uint32_t ctt_size; /* Always CTF_LSIZE_SENT. */
|
|
uint32_t ctt_type; /* Do not use. */
|
|
};
|
|
#endif
|
|
uint32_t ctt_lsizehi; /* High 32 bits of type size in bytes. */
|
|
uint32_t ctt_lsizelo; /* Low 32 bits of type size in bytes. */
|
|
} ctf_type_t;
|
|
|
|
#ifndef __GNUC__
|
|
#define ctt_size _u._size /* For fundamental types that have a size. */
|
|
#define ctt_type _u._type /* For types that reference another type. */
|
|
#endif
|
|
|
|
/* The following macros and inline functions compose and decompose values for
|
|
ctt_info and ctt_name, as well as other structures that contain name
|
|
references. Use outside libdtrace-ctf itself is explicitly for access to CTF
|
|
files directly: types returned from the library will always appear to be
|
|
CTF_V2.
|
|
|
|
v1: (transparently upgraded to v2 at open time: may be compiled out of the
|
|
library)
|
|
------------------------
|
|
ctt_info: | kind | isroot | vlen |
|
|
------------------------
|
|
15 11 10 9 0
|
|
|
|
v2:
|
|
------------------------
|
|
ctt_info: | kind | isroot | vlen |
|
|
------------------------
|
|
31 26 25 24 0
|
|
|
|
CTF_V1 and V2 _INFO_VLEN have the same interface:
|
|
|
|
kind = CTF_*_INFO_KIND(c.ctt_info); <-- CTF_K_* value (see below)
|
|
vlen = CTF_*_INFO_VLEN(fp, c.ctt_info); <-- length of variable data list
|
|
|
|
stid = CTF_NAME_STID(c.ctt_name); <-- string table id number (0 or 1)
|
|
offset = CTF_NAME_OFFSET(c.ctt_name); <-- string table byte offset
|
|
|
|
c.ctt_info = CTF_TYPE_INFO(kind, vlen);
|
|
c.ctt_name = CTF_TYPE_NAME(stid, offset); */
|
|
|
|
#define CTF_V1_INFO_KIND(info) (((info) & 0xf800) >> 11)
|
|
#define CTF_V1_INFO_ISROOT(info) (((info) & 0x0400) >> 10)
|
|
#define CTF_V1_INFO_VLEN(info) (((info) & CTF_MAX_VLEN_V1))
|
|
|
|
#define CTF_V2_INFO_KIND(info) (((info) & 0xfc000000) >> 26)
|
|
#define CTF_V2_INFO_ISROOT(info) (((info) & 0x2000000) >> 25)
|
|
#define CTF_V2_INFO_VLEN(info) (((info) & CTF_MAX_VLEN))
|
|
|
|
#define CTF_NAME_STID(name) ((name) >> 31)
|
|
#define CTF_NAME_OFFSET(name) ((name) & CTF_MAX_NAME)
|
|
#define CTF_SET_STID(name, stid) ((name) | ((unsigned int) stid) << 31)
|
|
|
|
/* V2 only. */
|
|
#define CTF_TYPE_INFO(kind, isroot, vlen) \
|
|
(((kind) << 26) | (((isroot) ? 1 : 0) << 25) | ((vlen) & CTF_MAX_VLEN))
|
|
|
|
#define CTF_TYPE_NAME(stid, offset) \
|
|
(((stid) << 31) | ((offset) & CTF_MAX_NAME))
|
|
|
|
/* The next set of macros are for public consumption only. Not used internally,
|
|
since the relevant type boundary is dependent upon the version of the file at
|
|
*opening* time, not the version after transparent upgrade. Use
|
|
ctf_type_isparent() / ctf_type_ischild() for that. */
|
|
|
|
#define CTF_V2_TYPE_ISPARENT(fp, id) ((id) <= CTF_MAX_PTYPE)
|
|
#define CTF_V2_TYPE_ISCHILD(fp, id) ((id) > CTF_MAX_PTYPE)
|
|
#define CTF_V2_TYPE_TO_INDEX(id) ((id) & CTF_MAX_PTYPE)
|
|
#define CTF_V2_INDEX_TO_TYPE(id, child) ((child) ? ((id) | (CTF_MAX_PTYPE+1)) : (id))
|
|
|
|
#define CTF_V1_TYPE_ISPARENT(fp, id) ((id) <= CTF_MAX_PTYPE_V1)
|
|
#define CTF_V1_TYPE_ISCHILD(fp, id) ((id) > CTF_MAX_PTYPE_V1)
|
|
#define CTF_V1_TYPE_TO_INDEX(id) ((id) & CTF_MAX_PTYPE_V1)
|
|
#define CTF_V1_INDEX_TO_TYPE(id, child) ((child) ? ((id) | (CTF_MAX_PTYPE_V1+1)) : (id))
|
|
|
|
/* Valid for both V1 and V2. */
|
|
#define CTF_TYPE_LSIZE(cttp) \
|
|
(((uint64_t)(cttp)->ctt_lsizehi) << 32 | (cttp)->ctt_lsizelo)
|
|
#define CTF_SIZE_TO_LSIZE_HI(size) ((uint32_t)((uint64_t)(size) >> 32))
|
|
#define CTF_SIZE_TO_LSIZE_LO(size) ((uint32_t)(size))
|
|
|
|
#define CTF_STRTAB_0 0 /* String table id 0 (in-CTF). */
|
|
#define CTF_STRTAB_1 1 /* String table id 1 (ELF strtab). */
|
|
|
|
/* Values for CTF_TYPE_KIND(). If the kind has an associated data list,
|
|
CTF_INFO_VLEN() will extract the number of elements in the list, and
|
|
the type of each element is shown in the comments below. */
|
|
|
|
#define CTF_K_UNKNOWN 0 /* Unknown type (used for padding and
|
|
unrepresentable types). */
|
|
#define CTF_K_INTEGER 1 /* Variant data is CTF_INT_DATA (see below). */
|
|
#define CTF_K_FLOAT 2 /* Variant data is CTF_FP_DATA (see below). */
|
|
#define CTF_K_POINTER 3 /* ctt_type is referenced type. */
|
|
#define CTF_K_ARRAY 4 /* Variant data is single ctf_array_t. */
|
|
#define CTF_K_FUNCTION 5 /* ctt_type is return type, variant data is
|
|
list of argument types (unsigned short's for v1,
|
|
uint32_t's for v2). */
|
|
#define CTF_K_STRUCT 6 /* Variant data is list of ctf_member_t's. */
|
|
#define CTF_K_UNION 7 /* Variant data is list of ctf_member_t's. */
|
|
#define CTF_K_ENUM 8 /* Variant data is list of ctf_enum_t's. */
|
|
#define CTF_K_FORWARD 9 /* No additional data; ctt_name is tag. */
|
|
#define CTF_K_TYPEDEF 10 /* ctt_type is referenced type. */
|
|
#define CTF_K_VOLATILE 11 /* ctt_type is base type. */
|
|
#define CTF_K_CONST 12 /* ctt_type is base type. */
|
|
#define CTF_K_RESTRICT 13 /* ctt_type is base type. */
|
|
#define CTF_K_SLICE 14 /* Variant data is a ctf_slice_t. */
|
|
|
|
#define CTF_K_MAX 63 /* Maximum possible (V2) CTF_K_* value. */
|
|
|
|
/* Values for ctt_type when kind is CTF_K_INTEGER. The flags, offset in bits,
|
|
and size in bits are encoded as a single word using the following macros.
|
|
(However, you can also encode the offset and bitness in a slice.) */
|
|
|
|
#define CTF_INT_ENCODING(data) (((data) & 0xff000000) >> 24)
|
|
#define CTF_INT_OFFSET(data) (((data) & 0x00ff0000) >> 16)
|
|
#define CTF_INT_BITS(data) (((data) & 0x0000ffff))
|
|
|
|
#define CTF_INT_DATA(encoding, offset, bits) \
|
|
(((encoding) << 24) | ((offset) << 16) | (bits))
|
|
|
|
#define CTF_INT_SIGNED 0x01 /* Integer is signed (otherwise unsigned). */
|
|
#define CTF_INT_CHAR 0x02 /* Character display format. */
|
|
#define CTF_INT_BOOL 0x04 /* Boolean display format. */
|
|
#define CTF_INT_VARARGS 0x08 /* Varargs display format. */
|
|
|
|
/* Use CTF_CHAR to produce a char that agrees with the system's native
|
|
char signedness. */
|
|
#if CHAR_MIN == 0
|
|
# define CTF_CHAR (CTF_INT_CHAR)
|
|
#else
|
|
# define CTF_CHAR (CTF_INT_CHAR | CTF_INT_SIGNED)
|
|
#endif
|
|
|
|
/* Values for ctt_type when kind is CTF_K_FLOAT. The encoding, offset in bits,
|
|
and size in bits are encoded as a single word using the following macros.
|
|
(However, you can also encode the offset and bitness in a slice.) */
|
|
|
|
#define CTF_FP_ENCODING(data) (((data) & 0xff000000) >> 24)
|
|
#define CTF_FP_OFFSET(data) (((data) & 0x00ff0000) >> 16)
|
|
#define CTF_FP_BITS(data) (((data) & 0x0000ffff))
|
|
|
|
#define CTF_FP_DATA(encoding, offset, bits) \
|
|
(((encoding) << 24) | ((offset) << 16) | (bits))
|
|
|
|
/* Variant data when kind is CTF_K_FLOAT is an encoding in the top eight bits. */
|
|
#define CTF_FP_ENCODING(data) (((data) & 0xff000000) >> 24)
|
|
|
|
#define CTF_FP_SINGLE 1 /* IEEE 32-bit float encoding. */
|
|
#define CTF_FP_DOUBLE 2 /* IEEE 64-bit float encoding. */
|
|
#define CTF_FP_CPLX 3 /* Complex encoding. */
|
|
#define CTF_FP_DCPLX 4 /* Double complex encoding. */
|
|
#define CTF_FP_LDCPLX 5 /* Long double complex encoding. */
|
|
#define CTF_FP_LDOUBLE 6 /* Long double encoding. */
|
|
#define CTF_FP_INTRVL 7 /* Interval (2x32-bit) encoding. */
|
|
#define CTF_FP_DINTRVL 8 /* Double interval (2x64-bit) encoding. */
|
|
#define CTF_FP_LDINTRVL 9 /* Long double interval (2x128-bit) encoding. */
|
|
#define CTF_FP_IMAGRY 10 /* Imaginary (32-bit) encoding. */
|
|
#define CTF_FP_DIMAGRY 11 /* Long imaginary (64-bit) encoding. */
|
|
#define CTF_FP_LDIMAGRY 12 /* Long double imaginary (128-bit) encoding. */
|
|
|
|
#define CTF_FP_MAX 12 /* Maximum possible CTF_FP_* value */
|
|
|
|
/* A slice increases the offset and reduces the bitness of the referenced
|
|
ctt_type, which must be a type which has an encoding (fp, int, or enum). We
|
|
also store the referenced type in here, because it is easier to keep the
|
|
ctt_size correct for the slice than to shuffle the size into here and keep
|
|
the ctt_type where it is for other types.
|
|
|
|
In a future version, where we loosen requirements on alignment in the CTF
|
|
file, the cts_offset and cts_bits will be chars: but for now they must be
|
|
shorts or everything after a slice will become unaligned. */
|
|
|
|
typedef struct ctf_slice
|
|
{
|
|
uint32_t cts_type;
|
|
unsigned short cts_offset;
|
|
unsigned short cts_bits;
|
|
} ctf_slice_t;
|
|
|
|
typedef struct ctf_array_v1
|
|
{
|
|
unsigned short cta_contents; /* Reference to type of array contents. */
|
|
unsigned short cta_index; /* Reference to type of array index. */
|
|
uint32_t cta_nelems; /* Number of elements. */
|
|
} ctf_array_v1_t;
|
|
|
|
typedef struct ctf_array
|
|
{
|
|
uint32_t cta_contents; /* Reference to type of array contents. */
|
|
uint32_t cta_index; /* Reference to type of array index. */
|
|
uint32_t cta_nelems; /* Number of elements. */
|
|
} ctf_array_t;
|
|
|
|
/* Most structure members have bit offsets that can be expressed using a short.
|
|
Some don't. ctf_member_t is used for structs which cannot contain any of
|
|
these large offsets, whereas ctf_lmember_t is used in the latter case. If
|
|
any member of a given struct has an offset that cannot be expressed using a
|
|
uint32_t, all members will be stored as type ctf_lmember_t. This is expected
|
|
to be very rare (but nonetheless possible). */
|
|
|
|
#define CTF_LSTRUCT_THRESH 536870912
|
|
|
|
/* In v1, the same is true, except that lmembers are used for structs >= 8192
|
|
bytes in size. (The ordering of members in the ctf_member_* structures is
|
|
different to improve padding.) */
|
|
|
|
#define CTF_LSTRUCT_THRESH_V1 8192
|
|
|
|
typedef struct ctf_member_v1
|
|
{
|
|
uint32_t ctm_name; /* Reference to name in string table. */
|
|
unsigned short ctm_type; /* Reference to type of member. */
|
|
unsigned short ctm_offset; /* Offset of this member in bits. */
|
|
} ctf_member_v1_t;
|
|
|
|
typedef struct ctf_lmember_v1
|
|
{
|
|
uint32_t ctlm_name; /* Reference to name in string table. */
|
|
unsigned short ctlm_type; /* Reference to type of member. */
|
|
unsigned short ctlm_pad; /* Padding. */
|
|
uint32_t ctlm_offsethi; /* High 32 bits of member offset in bits. */
|
|
uint32_t ctlm_offsetlo; /* Low 32 bits of member offset in bits. */
|
|
} ctf_lmember_v1_t;
|
|
|
|
typedef struct ctf_member_v2
|
|
{
|
|
uint32_t ctm_name; /* Reference to name in string table. */
|
|
uint32_t ctm_offset; /* Offset of this member in bits. */
|
|
uint32_t ctm_type; /* Reference to type of member. */
|
|
} ctf_member_t;
|
|
|
|
typedef struct ctf_lmember_v2
|
|
{
|
|
uint32_t ctlm_name; /* Reference to name in string table. */
|
|
uint32_t ctlm_offsethi; /* High 32 bits of member offset in bits. */
|
|
uint32_t ctlm_type; /* Reference to type of member. */
|
|
uint32_t ctlm_offsetlo; /* Low 32 bits of member offset in bits. */
|
|
} ctf_lmember_t;
|
|
|
|
#define CTF_LMEM_OFFSET(ctlmp) \
|
|
(((uint64_t)(ctlmp)->ctlm_offsethi) << 32 | (ctlmp)->ctlm_offsetlo)
|
|
#define CTF_OFFSET_TO_LMEMHI(offset) ((uint32_t)((uint64_t)(offset) >> 32))
|
|
#define CTF_OFFSET_TO_LMEMLO(offset) ((uint32_t)(offset))
|
|
|
|
typedef struct ctf_enum
|
|
{
|
|
uint32_t cte_name; /* Reference to name in string table. */
|
|
int32_t cte_value; /* Value associated with this name. */
|
|
} ctf_enum_t;
|
|
|
|
/* The ctf_archive is a collection of ctf_dict_t's stored together. The format
|
|
is suitable for mmap()ing: this control structure merely describes the
|
|
mmap()ed archive (and overlaps the first few bytes of it), hence the
|
|
greater care taken with integral types. All CTF files in an archive
|
|
must have the same data model. (This is not validated.)
|
|
|
|
All integers in this structure are stored in little-endian byte order.
|
|
|
|
The code relies on the fact that everything in this header is a uint64_t
|
|
and thus the header needs no padding (in particular, that no padding is
|
|
needed between ctfa_ctfs and the unnamed ctfa_archive_modent array
|
|
that follows it).
|
|
|
|
This is *not* the same as the data structure returned by the ctf_arc_*()
|
|
functions: this is the low-level on-disk representation. */
|
|
|
|
#define CTFA_MAGIC 0x8b47f2a4d7623eeb /* Random. */
|
|
struct ctf_archive
|
|
{
|
|
/* Magic number. (In loaded files, overwritten with the file size
|
|
so ctf_arc_close() knows how much to munmap()). */
|
|
uint64_t ctfa_magic;
|
|
|
|
/* CTF data model. */
|
|
uint64_t ctfa_model;
|
|
|
|
/* Number of CTF dicts in the archive. */
|
|
uint64_t ctfa_ndicts;
|
|
|
|
/* Offset of the name table. */
|
|
uint64_t ctfa_names;
|
|
|
|
/* Offset of the CTF table. Each element starts with a size (a uint64_t
|
|
in network byte order) then a ctf_dict_t of that size. */
|
|
uint64_t ctfa_ctfs;
|
|
};
|
|
|
|
/* An array of ctfa_nnamed of this structure lies at
|
|
ctf_archive[ctf_archive->ctfa_modents] and gives the ctfa_ctfs or
|
|
ctfa_names-relative offsets of each name or ctf_dict_t. */
|
|
|
|
typedef struct ctf_archive_modent
|
|
{
|
|
uint64_t name_offset;
|
|
uint64_t ctf_offset;
|
|
} ctf_archive_modent_t;
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _CTF_H */
|