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NetBSD/libexec/ld.elf_so/rtld.h
mycroft 43cfeb27a9 Catch up with type changes. Also: 
* Apply DT_PLTRELSZ to (one of) pltrel or pltrela *after* we've finished
  parsing the headers, so we know which one.
* Fix sparc64 bogons.  (It works now!)
2000-07-26 02:07:34 +00:00

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/* $NetBSD: rtld.h,v 1.27 2000/07/26 02:07:35 mycroft Exp $ */
/*
* Copyright 1996 John D. Polstra.
* Copyright 1996 Matt Thomas <matt@3am-software.com>
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Polstra.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
#ifndef RTLD_H
#define RTLD_H
#include <dlfcn.h>
#include <stddef.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/exec_elf.h>
#include "rtldenv.h"
#include "link.h"
#if defined(_RTLD_SOURCE)
#define RTLD_DEFAULT_LIBRARY_PATH "/usr/lib"
#define _PATH_LD_HINTS "/etc/ld.so.conf"
#if 0
#define SVR4_LIBDIR "/usr/lib"
#endif
#define LIBDIRLEN (sizeof LIBDIR - 1)
#define SVR4_LIBDIRLEN (sizeof SVR4_LIBDIR - 1)
#ifndef PAGESIZE
# ifdef VARPSZ
extern int _rtld_pagesz;
# ifdef RTLD_DEBUG
# define PAGESIZE (assert(_rtld_pagesz), _rtld_pagesz)
# else
# define PAGESIZE _rtld_pagesz
# endif
# else
# ifndef __sparc__
# define PAGESIZE NBPG
# else
#error "Sparc has a variable page size"
# endif
# endif
#endif
#define round_down(x) ((x) & ~(PAGESIZE-1))
#define round_up(x) round_down((x) + PAGESIZE - 1)
#define NEW(type) ((type *) xmalloc(sizeof(type)))
#define CNEW(type) ((type *) xcalloc(sizeof(type)))
#endif /* _RTLD_SOURCE */
/*
* C++ has mandated the use of the following keywords for its new boolean
* type. We might as well follow their lead.
*/
typedef enum {
false = 0,
true = 1
} bool;
struct Struct_Obj_Entry;
typedef struct Struct_Objlist_Entry {
SIMPLEQ_ENTRY(Struct_Objlist_Entry) link;
struct Struct_Obj_Entry *obj;
} Objlist_Entry;
typedef SIMPLEQ_HEAD(Struct_Objlist, Struct_Objlist_Entry) Objlist;
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 _rtld_search_path_t {
struct _rtld_search_path_t *sp_next;
const char *sp_path;
size_t sp_pathlen;
} Search_Path;
#define RTLD_MAX_ENTRY 10
#define RTLD_MAX_LIBRARY 4
#define RTLD_MAX_CTL 2
typedef struct _rtld_library_xform_t {
struct _rtld_library_xform_t *next;
char *name;
int ctl[RTLD_MAX_CTL];
int ctltype[RTLD_MAX_CTL];
int ctlmax;
struct {
char *value;
char *library[RTLD_MAX_LIBRARY];
} entry[RTLD_MAX_ENTRY];
} Library_Xform;
/*
* Shared object descriptor.
*
* Items marked with "(%)" are dynamically allocated, and must be freed
* when the structure is destroyed.
*/
#define RTLD_MAGIC 0xd550b87a
#define RTLD_VERSION 1
typedef struct Struct_Obj_Entry {
Elf32_Word magic; /* Magic number (sanity check) */
Elf32_Word version; /* Version number of struct format */
struct Struct_Obj_Entry *next;
char *path; /* Pathname of underlying 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; /* Reloc const = mapbase - *vaddrbase */
Elf_Dyn *dynamic; /* Dynamic section */
caddr_t entry; /* Entry point */
const Elf_Phdr *phdr; /* Program header if mapped, ow NULL */
size_t phsize; /* Size of program header in bytes */
/* Items from the dynamic section. */
Elf_Addr *pltgot; /* PLTGOT table */
const Elf_Rel *rel; /* Relocation entries */
const Elf_Rel *rellim; /* Limit of Relocation entries */
const Elf_RelA *rela; /* Relocation entries */
const Elf_RelA *relalim; /* Limit of Relocation entries */
const Elf_Rel *pltrel; /* PLT relocation entries */
const Elf_Rel *pltrellim; /* Limit of PLT relocation entries */
const Elf_RelA *pltrela; /* PLT relocation entries */
const Elf_RelA *pltrelalim; /* Limit of PLT relocation entries */
const Elf_Sym *symtab; /* Symbol table */
const char *strtab; /* String table */
unsigned long strsize; /* Size in bytes of string table */
#if defined(__mips__)
Elf_Word local_gotno; /* Number of local GOT entries */
Elf_Word symtabno; /* Number of dynamic symbols */
Elf_Word gotsym; /* First dynamic symbol in GOT */
#endif
const Elf_Word *buckets; /* Hash table buckets array */
unsigned long nbuckets; /* Number of buckets */
const Elf_Word *chains; /* Hash table chain array */
unsigned long nchains; /* Number of chains */
Search_Path *rpaths; /* Search path specified in object */
Needed_Entry *needed; /* Shared objects needed by this (%) */
void (*init) /* Initialization function to call */
__P((void));
void (*fini) /* Termination function to call */
__P((void));
/* Entry points for dlopen() and friends. */
void *(*dlopen) __P((const char *, int));
void *(*dlsym) __P((void *, const char *));
char *(*dlerror) __P((void));
int (*dlclose) __P((void *));
int (*dladdr) __P((const void *, Dl_info *));
u_int32_t mainprog:1, /* True if this is the main program */
rtld:1, /* True if this is the dynamic linker */
textrel:1, /* True if there are relocations to
* text seg */
symbolic:1, /* True if generated with
* "-Bsymbolic" */
printed:1; /* True if ldd has printed it */
struct link_map linkmap; /* for GDB */
/* These items are computed by map_object() or by digest_phdr(). */
const char *interp; /* Pathname of the interpreter, if any */
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 */
unsigned long mark; /* Set to "_rtld_curmark" to avoid
repeat visits */
} Obj_Entry;
#if defined(_RTLD_SOURCE)
extern struct r_debug _rtld_debug;
extern Search_Path *_rtld_default_paths;
extern Obj_Entry *_rtld_objlist;
extern Obj_Entry **_rtld_objtail;
extern Obj_Entry *_rtld_objmain;
extern Obj_Entry _rtld_objself;
extern Search_Path *_rtld_paths;
extern Library_Xform *_rtld_xforms;
extern bool _rtld_trust;
extern const char *_rtld_error_message;
extern unsigned long _rtld_curmark;
extern Objlist _rtld_list_global;
extern Objlist _rtld_list_main;
extern Elf_Sym _rtld_sym_zero;
/* rtld_start.S */
void _rtld_bind_start __P((void));
/* rtld.c */
void _rtld_error __P((const char *, ...));
void _rtld_die __P((void));
char *_rtld_dlerror __P((void));
void *_rtld_dlopen __P((const char *, int));
void *_rtld_objmain_sym __P((const char *));
void *_rtld_dlsym __P((void *, const char *));
int _rtld_dlclose __P((void *));
int _rtld_dladdr __P((const void *, Dl_info *));
void _rtld_debug_state __P((void));
void _rtld_linkmap_add __P((Obj_Entry *));
void _rtld_linkmap_delete __P((Obj_Entry *));
/* headers.c */
void _rtld_digest_dynamic __P((Obj_Entry *));
Obj_Entry *_rtld_digest_phdr __P((const Elf_Phdr *, int, caddr_t));
/* load.c */
Obj_Entry *_rtld_load_object __P((char *, bool));
int _rtld_load_needed_objects __P((Obj_Entry *, bool));
int _rtld_preload __P((const char *, bool));
/* path.c */
void _rtld_add_paths __P((Search_Path **, const char *, bool));
void _rtld_process_hints __P((Search_Path **, Library_Xform **, const char *,
bool));
/* reloc.c */
int _rtld_do_copy_relocations __P((const Obj_Entry *, bool));
caddr_t _rtld_bind __P((Obj_Entry *, Elf_Word));
int _rtld_relocate_objects __P((Obj_Entry *, bool, bool));
int _rtld_relocate_nonplt_object __P((Obj_Entry *,
const Elf_RelA *, bool));
int _rtld_relocate_plt_object __P((Obj_Entry *, const Elf_RelA *,
caddr_t *, bool, bool));
/* search.c */
char *_rtld_find_library __P((const char *, const Obj_Entry *));
/* symbol.c */
unsigned long _rtld_elf_hash __P((const char *));
const Elf_Sym *_rtld_symlook_obj __P((const char *, unsigned long,
const Obj_Entry *, bool));
const Elf_Sym *_rtld_find_symdef __P((const Obj_Entry *, Elf_Addr,
const char *, Obj_Entry *, const Obj_Entry **, bool));
const Elf_Sym *_rtld_symlook_list(const char *, unsigned long,
Objlist *, const Obj_Entry **, bool in_plt);
/* map_object.c */
Obj_Entry *_rtld_map_object __P((const char *, int, const struct stat *));
void _rtld_obj_free(Obj_Entry *);
Obj_Entry *_rtld_obj_new(void);
#if defined(__mips__)
/* mips_reloc.c */
void _rtld_relocate_mips_got __P((Obj_Entry *));
caddr_t _rtld_bind_mips __P((Elf_Word, Elf_Addr, Elf_Addr, Elf_Addr));
#endif
#if defined(__powerpc__)
/* ppc_reloc.c */
caddr_t _rtld_bind_powerpc __P((Obj_Entry *, Elf_Word));
int _rtld_reloc_powerpc_plt __P((Obj_Entry *, const Elf_RelA *, bool));
void _rtld_setup_powerpc_plt __P((const Obj_Entry *));
#endif
#endif /* _RTLD_SOURCE */
#endif /* RTLD_H */
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