[dragonfly.git] / libexec / rtld-elf / rtld.h

/*-
 * Copyright 1996, 1997, 1998, 1999, 2000 John D. Polstra.
 * 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 ``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 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.
 *
 * $FreeBSD$
 */

#ifndef RTLD_H /* { */
#define RTLD_H 1

#include <machine/elf.h>
#include <sys/types.h>
#include <sys/queue.h>

#include <elf-hints.h>
#include <link.h>
#include <stdarg.h>
#include <setjmp.h>
#include <stddef.h>

#include "rtld_lock.h"
#include "rtld_machdep.h"

#ifndef STANDARD_LIBRARY_PATH
#define STANDARD_LIBRARY_PATH	"/usr/lib"
#endif

#define NEW(type)	((type *) xmalloc(sizeof(type)))
#define CNEW(type)	((type *) xcalloc(sizeof(type)))

/* We might as well do booleans like C++. */
typedef unsigned char bool;
#define false	0
#define true	1

extern size_t tls_last_offset;
extern size_t tls_last_size;
extern size_t tls_static_space;
extern int tls_dtv_generation;
extern int tls_max_index;

struct stat;
struct Struct_Obj_Entry;

/* Lists of shared objects */
typedef struct Struct_Objlist_Entry {
    STAILQ_ENTRY(Struct_Objlist_Entry) link;
    struct Struct_Obj_Entry *obj;
} Objlist_Entry;

typedef STAILQ_HEAD(Struct_Objlist, Struct_Objlist_Entry) Objlist;

/* Types of init and fini functions */
typedef void (*InitFunc)(void);

/* Lists of shared object dependencies */
typedef struct Struct_Needed_Entry {
    struct Struct_Needed_Entry *next;
    struct Struct_Obj_Entry *obj;
    unsigned long name;		/* Offset of name in string table */
} Needed_Entry;

typedef struct Struct_Name_Entry {
    STAILQ_ENTRY(Struct_Name_Entry) link;
    char   name[1];
} Name_Entry;

/* Lock object */
typedef struct Struct_LockInfo {
    void *context;		/* Client context for creating locks */
    void *thelock;		/* The one big lock */
    /* Debugging aids. */
    volatile int rcount;	/* Number of readers holding lock */
    volatile int wcount;	/* Number of writers holding lock */
    /* Methods */
    void *(*lock_create)(void *context);
    void (*rlock_acquire)(void *lock);
    void (*wlock_acquire)(void *lock);
    void (*rlock_release)(void *lock);
    void (*wlock_release)(void *lock);
    void (*lock_destroy)(void *lock);
    void (*context_destroy)(void *context);
} LockInfo;

typedef struct Struct_Ver_Entry {
	Elf_Word     hash;
	unsigned int flags;
	const char  *name;
	const char  *file;
} Ver_Entry;

#define VER_INFO_HIDDEN	0x01

/*
 * Shared object descriptor.
 *
 * Items marked with "(%)" are dynamically allocated, and must be freed
 * when the structure is destroyed.
 *
 * CAUTION: It appears that the JDK port peeks into these structures.
 * It looks at "next" and "mapbase" at least.  Don't add new members
 * near the front, until this can be straightened out.
 */
typedef struct Struct_Obj_Entry {
    /*
     * These two items have to be set right for compatibility with the
     * original ElfKit crt1.o.
     */
    Elf_Size magic;		/* Magic number (sanity check) */
    Elf_Size version;		/* Version number of struct format */

    struct Struct_Obj_Entry *next;
    char *path;			/* Pathname of underlying file (%) */
    char *origin_path;		/* Directory path of origin file */
    int refcount;
    int dl_refcount;		/* Number of times loaded by dlopen */

    /* These items are computed by map_object() or by digest_phdr(). */
    caddr_t mapbase;		/* Base address of mapped region */
    size_t mapsize;		/* Size of mapped region in bytes */
    size_t textsize;		/* Size of text segment in bytes */
    Elf_Addr vaddrbase;		/* Base address in shared object file */
    caddr_t relocbase;		/* Relocation constant = mapbase - vaddrbase */
    const Elf_Dyn *dynamic;	/* Dynamic section */
    caddr_t entry;		/* Entry point */
    const Elf_Phdr *phdr;	/* Program header if it is mapped, else NULL */
    size_t phsize;		/* Size of program header in bytes */
    const char *interp;		/* Pathname of the interpreter, if any */
    caddr_t relro_page; 	/* Address of first page of read-only data */
    size_t relro_size;  	/* Size of relro page(s) in bytes */

    /* TLS information */
    int tlsindex;		/* Index in DTV for this module */
    void *tlsinit;		/* Base address of TLS init block */
    size_t tlsinitsize;		/* Size of TLS init block for this module */
    size_t tlssize;		/* Size of TLS block for this module */
    size_t tlsoffset;		/* Offset of static TLS block for this module */
    size_t tlsalign;		/* Alignment of static TLS block */

    /* Items from the dynamic section. */
    Elf_Addr *pltgot;		/* PLT or GOT, depending on architecture */
    const Elf_Rel *rel;		/* Relocation entries */
    unsigned long relsize;	/* Size in bytes of relocation info */
    const Elf_Rela *rela;	/* Relocation entries with addend */
    unsigned long relasize;	/* Size in bytes of addend relocation info */
    const Elf_Rel *pltrel;	/* PLT relocation entries */
    unsigned long pltrelsize;	/* Size in bytes of PLT relocation info */
    const Elf_Rela *pltrela;	/* PLT relocation entries with addend */
    unsigned long pltrelasize;	/* Size in bytes of PLT addend reloc info */
    const Elf_Sym *symtab;	/* Symbol table */
    const char *strtab;		/* String table */
    unsigned long strsize;	/* Size in bytes of string table */

    const Elf_Verneed *verneed; /* Required versions. */
    Elf_Word verneednum;	/* Number of entries in verneed table */
    const Elf_Verdef  *verdef;	/* Provided versions. */
    Elf_Word verdefnum;		/* Number of entries in verdef table */
    const Elf_Versym *versyms;  /* Symbol versions table */

    const Elf_Hashelt *buckets;	/* Hash table buckets array */
    unsigned long nbuckets;	/* Number of buckets */
    const Elf_Hashelt *chains;	/* Hash table chain array */
    unsigned long nchains;	/* Number of chains */

    char *rpath;		/* Search path specified in object */
    Needed_Entry *needed;	/* Shared objects needed by this one (%) */
    Needed_Entry *needed_filtees;
    Needed_Entry *needed_aux_filtees;

    STAILQ_HEAD(, Struct_Name_Entry) names; /* List of names for this object we
					       know about. */
    Ver_Entry *vertab;		/* Versions required /defined by this object */
    int vernum;			/* Number of entries in vertab */

    Elf_Addr init;		/* Initialization function to call */
    Elf_Addr fini;		/* Termination function to call */

    bool mainprog : 1;		/* True if this is the main program */
    bool rtld : 1;		/* True if this is the dynamic linker */
    bool textrel : 1;		/* True if there are relocations to text seg */
    bool symbolic : 1;		/* True if generated with "-Bsymbolic" */
    bool bind_now : 1;		/* True if all relocations should be made first */
    bool traced : 1;		/* Already printed in ldd trace output */
    bool jmpslots_done : 1;	/* Already have relocated the jump slots */
    bool init_done : 1;		/* Already have added object to init list */
    bool tls_done : 1;		/* Already allocated offset for static TLS */
    bool phdr_alloc : 1;	/* Phdr is allocated and needs to be freed. */
    bool z_origin : 1;		/* Process rpath and soname tokens */
    bool z_nodelete : 1;	/* Do not unload the object and dependencies */
    bool z_noopen : 1;		/* Do not load on dlopen */
    bool z_loadfltr : 1;	/* Immediately load filtees */
    bool ref_nodel : 1;		/* Refcount increased to prevent dlclose */
    bool init_scanned: 1;	/* Object is already on init list. */
    bool on_fini_list: 1;	/* Object is already on fini list. */
    bool dag_inited : 1;	/* Object has its DAG initialized. */
    bool filtees_loaded : 1;	/* Filtees loaded */

    struct link_map linkmap;	/* For GDB and dlinfo() */
    Objlist dldags;		/* Object belongs to these dlopened DAGs (%) */
    Objlist dagmembers;		/* DAG has these members (%) */
    dev_t dev;			/* Object's filesystem's device */
    ino_t ino;			/* Object's inode number */
    void *priv;			/* Platform-dependent */
} Obj_Entry;

#define RTLD_MAGIC	0xd550b87a
#define RTLD_VERSION	1

#define RTLD_FUNCTRACE "_rtld_functrace"

/* Flags to be passed into symlook_ family of functions. */
#define SYMLOOK_IN_PLT	0x01	/* Lookup for PLT symbol */
#define SYMLOOK_DLSYM	0x02	/* Return newest versioned symbol. Used by
				   dlsym. */

/* Flags for load_object(). */
#define	RTLD_LO_NOLOAD	0x01	/* dlopen() specified RTLD_NOLOAD. */
#define	RTLD_LO_DLOPEN	0x02	/* Load_object() called from dlopen(). */
#define	RTLD_LO_TRACE	0x04	/* Only tracing. */
#define	RTLD_LO_NODELETE 0x08	/* Loaded object cannot be closed. */
#define	RTLD_LO_FILTEES 0x10	/* Loading filtee. */

/*
 * Symbol cache entry used during relocation to avoid multiple lookups
 * of the same symbol.
 */
typedef struct Struct_SymCache {
    const Elf_Sym *sym;		/* Symbol table entry */
    const Obj_Entry *obj;	/* Shared object which defines it */
} SymCache;

/*
 * This structure provides a reentrant way to keep a list of objects and
 * check which ones have already been processed in some way.
 */
typedef struct Struct_DoneList {
    const Obj_Entry **objs;		/* Array of object pointers */
    unsigned int num_alloc;		/* Allocated size of the array */
    unsigned int num_used;		/* Number of array slots used */
} DoneList;

struct Struct_RtldLockState {
	int lockstate;
	sigjmp_buf env;
};

/*
 * The pack of arguments and results for the symbol lookup functions.
 */
typedef struct Struct_SymLook {
    const char *name;
    unsigned long hash;
    const Ver_Entry *ventry;
    int flags;
    const Obj_Entry *defobj_out;
    const Elf_Sym *sym_out;
    struct Struct_RtldLockState *lockstate;
} SymLook;

void _rtld_error(const char *, ...) __printflike(1, 2);
Obj_Entry *map_object(int, const char *, const struct stat *);
void *xcalloc(size_t);
void *xmalloc(size_t);
char *xstrdup(const char *);
extern Elf_Addr _GLOBAL_OFFSET_TABLE_[];

void dump_relocations(Obj_Entry *);
void dump_obj_relocations(Obj_Entry *);
void dump_Elf_Rel(Obj_Entry *, const Elf_Rel *, u_long);
void dump_Elf_Rela(Obj_Entry *, const Elf_Rela *, u_long);

/*
 * Function declarations.
 */
const char *basename(const char *);
unsigned long elf_hash(const char *);
const Elf_Sym *find_symdef(unsigned long, const Obj_Entry *,
  const Obj_Entry **, int, SymCache *, struct Struct_RtldLockState *);
void init_pltgot(Obj_Entry *);
void lockdflt_init(void);
void obj_free(Obj_Entry *);
Obj_Entry *obj_new(void);
void _rtld_bind_start(void);
void symlook_init(SymLook *, const char *);
int symlook_obj(SymLook *, const Obj_Entry *);
void *tls_get_addr_common(Elf_Addr** dtvp, int index, size_t offset);
struct tls_tcb	*allocate_tls(Obj_Entry *);
void free_tls(struct tls_tcb *);
void *allocate_module_tls(int index);
bool allocate_tls_offset(Obj_Entry *obj);
void free_tls_offset(Obj_Entry *obj);
const Ver_Entry *fetch_ventry(const Obj_Entry *obj, unsigned long);

/*
 * MD function declarations.
 */
int do_copy_relocations(Obj_Entry *);
int reloc_non_plt(Obj_Entry *, Obj_Entry *, struct Struct_RtldLockState *);
int reloc_plt(Obj_Entry *);
int reloc_jmpslots(Obj_Entry *, struct Struct_RtldLockState *);
void allocate_initial_tls(Obj_Entry *);

#endif /* } */
Commit	Line	Data
984263bc MD	1	/*-
	2	* Copyright 1996, 1997, 1998, 1999, 2000 John D. Polstra.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*
f4f4bfd5	25	* $FreeBSD$
984263bc MD	26	*/
	27
	28	#ifndef RTLD_H /* { */
	29	#define RTLD_H 1
	30
	31	#include <machine/elf.h>
	32	#include <sys/types.h>
	33	#include <sys/queue.h>
	34
	35	#include <elf-hints.h>
	36	#include <link.h>
abfcd5b1	37	#include <stdarg.h>
fcf53d9b	38	#include <setjmp.h>
984263bc MD	39	#include <stddef.h>
984263bc MD	40
fcf53d9b	41	#include "rtld_lock.h"
984263bc MD	42	#include "rtld_machdep.h"
	43
	44	#ifndef STANDARD_LIBRARY_PATH
	45	#define STANDARD_LIBRARY_PATH "/usr/lib"
	46	#endif
	47
	48	#define NEW(type) ((type *) xmalloc(sizeof(type)))
	49	#define CNEW(type) ((type *) xcalloc(sizeof(type)))
	50
	51	/* We might as well do booleans like C++. */
	52	typedef unsigned char bool;
	53	#define false 0
	54	#define true 1
	55
55b88cae DX	56	extern size_t tls_last_offset;
	57	extern size_t tls_last_size;
	58	extern size_t tls_static_space;
	59	extern int tls_dtv_generation;
	60	extern int tls_max_index;
	61
984263bc MD	62	struct stat;
	63	struct Struct_Obj_Entry;
	64
	65	/* Lists of shared objects */
	66	typedef struct Struct_Objlist_Entry {
	67	STAILQ_ENTRY(Struct_Objlist_Entry) link;
	68	struct Struct_Obj_Entry *obj;
	69	} Objlist_Entry;
	70
	71	typedef STAILQ_HEAD(Struct_Objlist, Struct_Objlist_Entry) Objlist;
	72
	73	/* Types of init and fini functions */
	74	typedef void (*InitFunc)(void);
	75
	76	/* Lists of shared object dependencies */
	77	typedef struct Struct_Needed_Entry {
	78	struct Struct_Needed_Entry *next;
	79	struct Struct_Obj_Entry *obj;
	80	unsigned long name; /* Offset of name in string table */
	81	} Needed_Entry;
	82
fcf53d9b JM	83	typedef struct Struct_Name_Entry {
	84	STAILQ_ENTRY(Struct_Name_Entry) link;
	85	char name[1];
	86	} Name_Entry;
	87
984263bc MD	88	/* Lock object */
	89	typedef struct Struct_LockInfo {
	90	void context; / Client context for creating locks */
	91	void thelock; / The one big lock */
	92	/* Debugging aids. */
	93	volatile int rcount; /* Number of readers holding lock */
	94	volatile int wcount; /* Number of writers holding lock */
	95	/* Methods */
	96	void (lock_create)(void *context);
	97	void (rlock_acquire)(void lock);
	98	void (wlock_acquire)(void lock);
	99	void (rlock_release)(void lock);
	100	void (wlock_release)(void lock);
	101	void (lock_destroy)(void lock);
	102	void (context_destroy)(void context);
	103	} LockInfo;
	104
fcf53d9b JM	105	typedef struct Struct_Ver_Entry {
	106	Elf_Word hash;
	107	unsigned int flags;
	108	const char *name;
	109	const char *file;
	110	} Ver_Entry;
	111
	112	#define VER_INFO_HIDDEN 0x01
	113
984263bc MD	114	/*
	115	* Shared object descriptor.
	116	*
	117	* Items marked with "(%)" are dynamically allocated, and must be freed
	118	* when the structure is destroyed.
	119	*
	120	* CAUTION: It appears that the JDK port peeks into these structures.
	121	* It looks at "next" and "mapbase" at least. Don't add new members
	122	* near the front, until this can be straightened out.
	123	*/
	124	typedef struct Struct_Obj_Entry {
	125	/*
	126	* These two items have to be set right for compatibility with the
	127	* original ElfKit crt1.o.
	128	*/
4648abf3 MD	129	Elf_Size magic; /* Magic number (sanity check) */
4648abf3 MD	130	Elf_Size version; /* Version number of struct format */
984263bc MD	131
	132	struct Struct_Obj_Entry *next;
	133	char path; / Pathname of underlying file (%) */
167f7029	134	char origin_path; / Directory path of origin file */
984263bc MD	135	int refcount;
	136	int dl_refcount; /* Number of times loaded by dlopen */
	137
	138	/* These items are computed by map_object() or by digest_phdr(). */
	139	caddr_t mapbase; /* Base address of mapped region */
	140	size_t mapsize; /* Size of mapped region in bytes */
	141	size_t textsize; /* Size of text segment in bytes */
	142	Elf_Addr vaddrbase; /* Base address in shared object file */
	143	caddr_t relocbase; /* Relocation constant = mapbase - vaddrbase */
	144	const Elf_Dyn dynamic; / Dynamic section */
	145	caddr_t entry; /* Entry point */
	146	const Elf_Phdr phdr; / Program header if it is mapped, else NULL */
	147	size_t phsize; /* Size of program header in bytes */
	148	const char interp; / Pathname of the interpreter, if any */
007f494e JM	149	caddr_t relro_page; /* Address of first page of read-only data */
007f494e JM	150	size_t relro_size; /* Size of relro page(s) in bytes */
984263bc	151
55b88cae DX	152	/* TLS information */
	153	int tlsindex; /* Index in DTV for this module */
	154	void tlsinit; / Base address of TLS init block */
	155	size_t tlsinitsize; /* Size of TLS init block for this module */
	156	size_t tlssize; /* Size of TLS block for this module */
	157	size_t tlsoffset; /* Offset of static TLS block for this module */
	158	size_t tlsalign; /* Alignment of static TLS block */
	159
984263bc MD	160	/* Items from the dynamic section. */
	161	Elf_Addr pltgot; / PLT or GOT, depending on architecture */
	162	const Elf_Rel rel; / Relocation entries */
	163	unsigned long relsize; /* Size in bytes of relocation info */
	164	const Elf_Rela rela; / Relocation entries with addend */
	165	unsigned long relasize; /* Size in bytes of addend relocation info */
	166	const Elf_Rel pltrel; / PLT relocation entries */
	167	unsigned long pltrelsize; /* Size in bytes of PLT relocation info */
	168	const Elf_Rela pltrela; / PLT relocation entries with addend */
	169	unsigned long pltrelasize; /* Size in bytes of PLT addend reloc info */
	170	const Elf_Sym symtab; / Symbol table */
	171	const char strtab; / String table */
	172	unsigned long strsize; /* Size in bytes of string table */
	173
fcf53d9b JM	174	const Elf_Verneed verneed; / Required versions. */
	175	Elf_Word verneednum; /* Number of entries in verneed table */
	176	const Elf_Verdef verdef; / Provided versions. */
	177	Elf_Word verdefnum; /* Number of entries in verdef table */
	178	const Elf_Versym versyms; / Symbol versions table */
	179
d697cc44	180	const Elf_Hashelt buckets; / Hash table buckets array */
984263bc	181	unsigned long nbuckets; /* Number of buckets */
d697cc44	182	const Elf_Hashelt chains; / Hash table chain array */
984263bc MD	183	unsigned long nchains; /* Number of chains */
984263bc MD	184
fcf53d9b	185	char rpath; / Search path specified in object */
984263bc	186	Needed_Entry needed; / Shared objects needed by this one (%) */
35b2b265 JM	187	Needed_Entry *needed_filtees;
35b2b265 JM	188	Needed_Entry *needed_aux_filtees;
984263bc	189
fcf53d9b JM	190	STAILQ_HEAD(, Struct_Name_Entry) names; /* List of names for this object we
	191	know about. */
	192	Ver_Entry vertab; / Versions required /defined by this object */
	193	int vernum; /* Number of entries in vertab */
	194
	195	Elf_Addr init; /* Initialization function to call */
	196	Elf_Addr fini; /* Termination function to call */
	197
	198	bool mainprog : 1; /* True if this is the main program */
	199	bool rtld : 1; /* True if this is the dynamic linker */
	200	bool textrel : 1; /* True if there are relocations to text seg */
	201	bool symbolic : 1; /* True if generated with "-Bsymbolic" */
	202	bool bind_now : 1; /* True if all relocations should be made first */
	203	bool traced : 1; /* Already printed in ldd trace output */
	204	bool jmpslots_done : 1; /* Already have relocated the jump slots */
	205	bool init_done : 1; /* Already have added object to init list */
	206	bool tls_done : 1; /* Already allocated offset for static TLS */
	207	bool phdr_alloc : 1; /* Phdr is allocated and needs to be freed. */
	208	bool z_origin : 1; /* Process rpath and soname tokens */
	209	bool z_nodelete : 1; /* Do not unload the object and dependencies */
	210	bool z_noopen : 1; /* Do not load on dlopen */
35b2b265	211	bool z_loadfltr : 1; /* Immediately load filtees */
fcf53d9b JM	212	bool ref_nodel : 1; /* Refcount increased to prevent dlclose */
	213	bool init_scanned: 1; /* Object is already on init list. */
	214	bool on_fini_list: 1; /* Object is already on fini list. */
	215	bool dag_inited : 1; /* Object has its DAG initialized. */
35b2b265	216	bool filtees_loaded : 1; /* Filtees loaded */
fcf53d9b JM	217
fcf53d9b JM	218	struct link_map linkmap; /* For GDB and dlinfo() */
984263bc MD	219	Objlist dldags; /* Object belongs to these dlopened DAGs (%) */
	220	Objlist dagmembers; /* DAG has these members (%) */
	221	dev_t dev; /* Object's filesystem's device */
	222	ino_t ino; /* Object's inode number */
30aefd4f	223	void priv; / Platform-dependent */
984263bc MD	224	} Obj_Entry;
	225
	226	#define RTLD_MAGIC 0xd550b87a
	227	#define RTLD_VERSION 1
	228
35b2b265 JM	229	#define RTLD_FUNCTRACE "_rtld_functrace"
35b2b265 JM	230
fcf53d9b JM	231	/* Flags to be passed into symlook_ family of functions. */
fcf53d9b JM	232	#define SYMLOOK_IN_PLT 0x01 /* Lookup for PLT symbol */
30aefd4f	233	#define SYMLOOK_DLSYM 0x02 /* Return newest versioned symbol. Used by
fcf53d9b JM	234	dlsym. */
	235
	236	/* Flags for load_object(). */
	237	#define RTLD_LO_NOLOAD 0x01 /* dlopen() specified RTLD_NOLOAD. */
	238	#define RTLD_LO_DLOPEN 0x02 /* Load_object() called from dlopen(). */
35b2b265 JM	239	#define RTLD_LO_TRACE 0x04 /* Only tracing. */
	240	#define RTLD_LO_NODELETE 0x08 /* Loaded object cannot be closed. */
	241	#define RTLD_LO_FILTEES 0x10 /* Loading filtee. */
fcf53d9b	242
984263bc MD	243	/*
	244	* Symbol cache entry used during relocation to avoid multiple lookups
	245	* of the same symbol.
	246	*/
	247	typedef struct Struct_SymCache {
	248	const Elf_Sym sym; / Symbol table entry */
	249	const Obj_Entry obj; / Shared object which defines it */
	250	} SymCache;
	251
35b2b265 JM	252	/*
	253	* This structure provides a reentrant way to keep a list of objects and
	254	* check which ones have already been processed in some way.
	255	*/
	256	typedef struct Struct_DoneList {
	257	const Obj_Entry *objs; / Array of object pointers */
	258	unsigned int num_alloc; /* Allocated size of the array */
	259	unsigned int num_used; /* Number of array slots used */
	260	} DoneList;
	261
fcf53d9b JM	262	struct Struct_RtldLockState {
	263	int lockstate;
	264	sigjmp_buf env;
	265	};
	266
35b2b265 JM	267	/*
	268	* The pack of arguments and results for the symbol lookup functions.
	269	*/
	270	typedef struct Struct_SymLook {
	271	const char *name;
	272	unsigned long hash;
	273	const Ver_Entry *ventry;
	274	int flags;
	275	const Obj_Entry *defobj_out;
	276	const Elf_Sym *sym_out;
	277	struct Struct_RtldLockState *lockstate;
	278	} SymLook;
	279
fcf53d9b JM	280	void _rtld_error(const char *, ...) __printflike(1, 2);
	281	Obj_Entry map_object(int, const char , const struct stat *);
	282	void *xcalloc(size_t);
	283	void *xmalloc(size_t);
	284	char xstrdup(const char );
4648abf3 MD	285	extern Elf_Addr _GLOBAL_OFFSET_TABLE_[];
4648abf3 MD	286
fcf53d9b JM	287	void dump_relocations(Obj_Entry *);
	288	void dump_obj_relocations(Obj_Entry *);
	289	void dump_Elf_Rel(Obj_Entry , const Elf_Rel , u_long);
	290	void dump_Elf_Rela(Obj_Entry , const Elf_Rela , u_long);
	291
984263bc MD	292	/*
	293	* Function declarations.
	294	*/
fcf53d9b JM	295	const char basename(const char );
	296	unsigned long elf_hash(const char *);
	297	const Elf_Sym find_symdef(unsigned long, const Obj_Entry ,
35b2b265	298	const Obj_Entry *, int, SymCache , struct Struct_RtldLockState *);
fcf53d9b JM	299	void init_pltgot(Obj_Entry *);
	300	void lockdflt_init(void);
	301	void obj_free(Obj_Entry *);
	302	Obj_Entry *obj_new(void);
	303	void _rtld_bind_start(void);
35b2b265 JM	304	void symlook_init(SymLook , const char );
35b2b265 JM	305	int symlook_obj(SymLook , const Obj_Entry );
fcf53d9b	306	void tls_get_addr_common(Elf_Addr* dtvp, int index, size_t offset);
a1eee96a	307	struct tls_tcb allocate_tls(Obj_Entry );
fcf53d9b JM	308	void free_tls(struct tls_tcb *);
	309	void *allocate_module_tls(int index);
	310	bool allocate_tls_offset(Obj_Entry *obj);
	311	void free_tls_offset(Obj_Entry *obj);
	312	const Ver_Entry fetch_ventry(const Obj_Entry obj, unsigned long);
	313
	314	/*
	315	* MD function declarations.
	316	*/
	317	int do_copy_relocations(Obj_Entry *);
35b2b265	318	int reloc_non_plt(Obj_Entry , Obj_Entry , struct Struct_RtldLockState *);
fcf53d9b	319	int reloc_plt(Obj_Entry *);
35b2b265	320	int reloc_jmpslots(Obj_Entry , struct Struct_RtldLockState );
fcf53d9b	321	void allocate_initial_tls(Obj_Entry *);
139b8f34	322
984263bc	323	#endif /* } */