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/*-
* Copyright (c) 1997-2000 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/sys/linker.h 218494 2011-02-09 19:08:21Z marcel $
*/
#ifndef _SYS_LINKER_H_
#define _SYS_LINKER_H_
#ifdef _KERNEL
#include <machine/elf.h>
#include <sys/kobj.h>
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_LINKER);
#endif
struct mod_depend;
/*
* Object representing a file which has been loaded by the linker.
*/
typedef struct linker_file* linker_file_t;
typedef TAILQ_HEAD(, linker_file) linker_file_list_t;
typedef caddr_t linker_sym_t; /* opaque symbol */
typedef c_caddr_t c_linker_sym_t; /* const opaque symbol */
typedef int (*linker_function_name_callback_t)(const char *, void *);
/*
* expanded out linker_sym_t
*/
typedef struct linker_symval {
const char* name;
caddr_t value;
size_t size;
} linker_symval_t;
typedef int (*linker_function_nameval_callback_t)(linker_file_t, int, linker_symval_t *, void *);
struct common_symbol {
STAILQ_ENTRY(common_symbol) link;
char* name;
caddr_t address;
};
struct linker_file {
KOBJ_FIELDS;
int refs; /* reference count */
int userrefs; /* kldload(2) count */
int flags;
#define LINKER_FILE_LINKED 0x1 /* file has been fully linked */
TAILQ_ENTRY(linker_file) link; /* list of all loaded files */
char* filename; /* file which was loaded */
char* pathname; /* file name with full path */
int id; /* unique id */
caddr_t address; /* load address */
size_t size; /* size of file */
int ndeps; /* number of dependencies */
linker_file_t* deps; /* list of dependencies */
STAILQ_HEAD(, common_symbol) common; /* list of common symbols */
TAILQ_HEAD(, module) modules; /* modules in this file */
TAILQ_ENTRY(linker_file) loaded; /* preload dependency support */
int loadcnt; /* load counter value */
/*
* Function Boundary Tracing (FBT) or Statically Defined Tracing (SDT)
* fields.
*/
int nenabled; /* number of enabled probes. */
int fbt_nentries; /* number of fbt entries created. */
void *sdt_probes;
int sdt_nentries;
size_t sdt_nprobes;
size_t sdt_size;
};
/*
* Object implementing a class of file (a.out, elf, etc.)
*/
typedef struct linker_class *linker_class_t;
typedef TAILQ_HEAD(, linker_class) linker_class_list_t;
struct linker_class {
KOBJ_CLASS_FIELDS;
TAILQ_ENTRY(linker_class) link; /* list of all file classes */
};
/*
* Function type used when iterating over the list of linker files.
*/
typedef int linker_predicate_t(linker_file_t, void *);
/*
* The "file" for the kernel.
*/
extern linker_file_t linker_kernel_file;
/*
* Obtain a reference to a module, loading it if required.
*/
int linker_reference_module(const char* _modname, struct mod_depend *_verinfo,
linker_file_t* _result);
/*
* Release a reference to a module, unloading it if there are no more
* references. Note that one should either provide a module name and
* optional version info or a linker file, but not both.
*/
int linker_release_module(const char *_modname, struct mod_depend *_verinfo,
linker_file_t _file);
/*
* Iterate over all of the currently loaded linker files calling the
* predicate function while the function returns 0. Returns the value
* returned by the last predicate function.
*/
int linker_file_foreach(linker_predicate_t *_predicate, void *_context);
/*
* Lookup a symbol in a file. If deps is TRUE, look in dependencies
* if not found in file.
*/
caddr_t linker_file_lookup_symbol(linker_file_t _file, const char* _name,
int _deps);
/*
* Lookup a linker set in a file. Return pointers to the first entry,
* last + 1, and count of entries. Use: for (p = start; p < stop; p++) {}
* void *start is really: "struct yoursetmember ***start;"
*/
int linker_file_lookup_set(linker_file_t _file, const char *_name,
void *_start, void *_stop, int *_count);
/*
* List all functions in a file.
*/
int linker_file_function_listall(linker_file_t,
linker_function_nameval_callback_t, void *);
/*
* Functions soley for use by the linker class handlers.
*/
int linker_add_class(linker_class_t _cls);
int linker_file_unload(linker_file_t _file, int flags);
int linker_load_dependencies(linker_file_t _lf);
linker_file_t linker_make_file(const char* _filename, linker_class_t _cls);
/*
* DDB Helpers, tuned specifically for ddb/db_kld.c
*/
int linker_ddb_lookup(const char *_symstr, c_linker_sym_t *_sym);
int linker_ddb_search_symbol(caddr_t _value, c_linker_sym_t *_sym,
long *_diffp);
int linker_ddb_symbol_values(c_linker_sym_t _sym, linker_symval_t *_symval);
int linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
long *offset);
/*
* stack(9) helper for situations where kernel locking is required.
*/
int linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
long *offset);
/* HWPMC helper */
void *linker_hwpmc_list_objects(void);
#endif /* _KERNEL */
/*
* Module information subtypes
*/
#define MODINFO_END 0x0000 /* End of list */
#define MODINFO_NAME 0x0001 /* Name of module (string) */
#define MODINFO_TYPE 0x0002 /* Type of module (string) */
#define MODINFO_ADDR 0x0003 /* Loaded address */
#define MODINFO_SIZE 0x0004 /* Size of module */
#define MODINFO_EMPTY 0x0005 /* Has been deleted */
#define MODINFO_ARGS 0x0006 /* Parameters string */
#define MODINFO_METADATA 0x8000 /* Module-specfic */
#define MODINFOMD_AOUTEXEC 0x0001 /* a.out exec header */
#define MODINFOMD_ELFHDR 0x0002 /* ELF header */
#define MODINFOMD_SSYM 0x0003 /* start of symbols */
#define MODINFOMD_ESYM 0x0004 /* end of symbols */
#define MODINFOMD_DYNAMIC 0x0005 /* _DYNAMIC pointer */
/* These values are MD on these two platforms */
#if !defined(__sparc64__) && !defined(__powerpc__)
#define MODINFOMD_ENVP 0x0006 /* envp[] */
#define MODINFOMD_HOWTO 0x0007 /* boothowto */
#define MODINFOMD_KERNEND 0x0008 /* kernend */
#endif
#define MODINFOMD_SHDR 0x0009 /* section header table */
#define MODINFOMD_NOCOPY 0x8000 /* don't copy this metadata to the kernel */
#define MODINFOMD_DEPLIST (0x4001 | MODINFOMD_NOCOPY) /* depends on */
#ifdef _KERNEL
#define MD_FETCH(mdp, info, type) ({ \
type *__p; \
__p = (type *)preload_search_info((mdp), MODINFO_METADATA | (info)); \
__p ? *__p : 0; \
})
#endif
#define LINKER_HINTS_VERSION 1 /* linker.hints file version */
#ifdef _KERNEL
/*
* Module lookup
*/
extern vm_offset_t preload_addr_relocate;
extern caddr_t preload_metadata;
extern void * preload_fetch_addr(caddr_t _mod);
extern size_t preload_fetch_size(caddr_t _mod);
extern caddr_t preload_search_by_name(const char *_name);
extern caddr_t preload_search_by_type(const char *_type);
extern caddr_t preload_search_next_name(caddr_t _base);
extern caddr_t preload_search_info(caddr_t _mod, int _inf);
extern void preload_delete_name(const char *_name);
extern void preload_bootstrap_relocate(vm_offset_t _offset);
#ifdef KLD_DEBUG
extern int kld_debug;
#define KLD_DEBUG_FILE 1 /* file load/unload */
#define KLD_DEBUG_SYM 2 /* symbol lookup */
#define KLD_DPF(cat, args) \
do { \
if (kld_debug & KLD_DEBUG_##cat) printf args; \
} while (0)
#else
#define KLD_DPF(cat, args)
#endif
typedef Elf_Addr elf_lookup_fn(linker_file_t, Elf_Size, int);
/* Support functions */
int elf_reloc(linker_file_t _lf, Elf_Addr base, const void *_rel, int _type, elf_lookup_fn _lu);
int elf_reloc_local(linker_file_t _lf, Elf_Addr base, const void *_rel, int _type, elf_lookup_fn _lu);
Elf_Addr elf_relocaddr(linker_file_t _lf, Elf_Addr addr);
const Elf_Sym *elf_get_sym(linker_file_t _lf, Elf_Size _symidx);
const char *elf_get_symname(linker_file_t _lf, Elf_Size _symidx);
typedef struct linker_ctf {
const uint8_t *ctftab; /* Decompressed CTF data. */
int ctfcnt; /* Number of CTF data bytes. */
const Elf_Sym *symtab; /* Ptr to the symbol table. */
int nsym; /* Number of symbols. */
const char *strtab; /* Ptr to the string table. */
int strcnt; /* Number of string bytes. */
uint32_t **ctfoffp; /* Ptr to array of obj/fnc offsets. */
uint32_t **typoffp; /* Ptr to array of type offsets. */
long *typlenp; /* Ptr to number of type data entries. */
} linker_ctf_t;
int linker_ctf_get(linker_file_t, linker_ctf_t *);
int elf_cpu_load_file(linker_file_t);
int elf_cpu_unload_file(linker_file_t);
/* values for type */
#define ELF_RELOC_REL 1
#define ELF_RELOC_RELA 2
/*
* This is version 1 of the KLD file status structure. It is identified
* by its _size_ in the version field.
*/
struct kld_file_stat_1 {
int version; /* set to sizeof(struct kld_file_stat_1) */
char name[MAXPATHLEN];
int refs;
int id;
caddr_t address; /* load address */
size_t size; /* size in bytes */
};
#endif /* _KERNEL */
struct kld_file_stat {
int version; /* set to sizeof(struct kld_file_stat) */
char name[MAXPATHLEN];
int refs;
int id;
caddr_t address; /* load address */
size_t size; /* size in bytes */
char pathname[MAXPATHLEN];
};
struct kld_sym_lookup {
int version; /* set to sizeof(struct kld_sym_lookup) */
char *symname; /* Symbol name we are looking up */
u_long symvalue;
size_t symsize;
};
#define KLDSYM_LOOKUP 1
/*
* Flags for kldunloadf() and linker_file_unload()
*/
#define LINKER_UNLOAD_NORMAL 0
#define LINKER_UNLOAD_FORCE 1
#ifndef _KERNEL
#include <sys/cdefs.h>
__BEGIN_DECLS
int kldload(const char* _file);
int kldunload(int _fileid);
int kldunloadf(int _fileid, int flags);
int kldfind(const char* _file);
int kldnext(int _fileid);
int kldstat(int _fileid, struct kld_file_stat* _stat);
int kldfirstmod(int _fileid);
int kldsym(int _fileid, int _cmd, void *_data);
__END_DECLS
#endif
#endif /* !_SYS_LINKER_H_ */