279 lines
9.6 KiB
C
279 lines
9.6 KiB
C
/* $NetBSD: rtld.h,v 1.69 2003/07/24 10:12:26 skrll Exp $ */
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/*
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* Copyright 1996 John D. Polstra.
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* Copyright 1996 Matt Thomas <matt@3am-software.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Polstra.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef RTLD_H
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#define RTLD_H
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#include <dlfcn.h>
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#include <stddef.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/exec_elf.h>
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#include "rtldenv.h"
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#include "link.h"
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#if defined(_RTLD_SOURCE)
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#ifndef RTLD_DEFAULT_LIBRARY_PATH
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#define RTLD_DEFAULT_LIBRARY_PATH "/usr/lib"
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#endif
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#define _PATH_LD_HINTS "/etc/ld.so.conf"
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extern int _rtld_pagesz;
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#define round_down(x) ((x) & ~(_rtld_pagesz - 1))
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#define round_up(x) round_down((x) + _rtld_pagesz - 1)
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#define NEW(type) ((type *) xmalloc(sizeof(type)))
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#define CNEW(type) ((type *) xcalloc(sizeof(type)))
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#endif /* _RTLD_SOURCE */
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/*
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* C++ has mandated the use of the following keywords for its new boolean
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* type. We might as well follow their lead.
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*/
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typedef enum {
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false = 0,
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true = 1
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} bool;
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struct Struct_Obj_Entry;
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typedef struct Struct_Objlist_Entry {
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SIMPLEQ_ENTRY(Struct_Objlist_Entry) link;
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struct Struct_Obj_Entry *obj;
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} Objlist_Entry;
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typedef SIMPLEQ_HEAD(Struct_Objlist, Struct_Objlist_Entry) Objlist;
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typedef struct Struct_Needed_Entry {
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struct Struct_Needed_Entry *next;
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struct Struct_Obj_Entry *obj;
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unsigned long name; /* Offset of name in string table */
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} Needed_Entry;
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typedef struct _rtld_search_path_t {
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struct _rtld_search_path_t *sp_next;
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const char *sp_path;
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size_t sp_pathlen;
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} Search_Path;
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#define RTLD_MAX_ENTRY 10
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#define RTLD_MAX_LIBRARY 4
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#define RTLD_MAX_CTL 2
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typedef struct _rtld_library_xform_t {
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struct _rtld_library_xform_t *next;
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char *name;
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int ctl[RTLD_MAX_CTL];
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int ctltype[RTLD_MAX_CTL];
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int ctlmax;
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struct {
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char *value;
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char *library[RTLD_MAX_LIBRARY];
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} entry[RTLD_MAX_ENTRY];
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} Library_Xform;
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/*
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* Shared object descriptor.
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*
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* Items marked with "(%)" are dynamically allocated, and must be freed
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* when the structure is destroyed.
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*/
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#define RTLD_MAGIC 0xd550b87a
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#define RTLD_VERSION 1
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#define RTLD_MAIN 0x800
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typedef struct Struct_Obj_Entry {
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Elf32_Word magic; /* Magic number (sanity check) */
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Elf32_Word version; /* Version number of struct format */
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struct Struct_Obj_Entry *next;
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char *path; /* Pathname of underlying file (%) */
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int refcount;
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int dl_refcount; /* Number of times loaded by dlopen */
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/* These items are computed by map_object() or by digest_phdr(). */
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caddr_t mapbase; /* Base address of mapped region */
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size_t mapsize; /* Size of mapped region in bytes */
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size_t textsize; /* Size of text segment in bytes */
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Elf_Addr vaddrbase; /* Base address in shared object file */
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caddr_t relocbase; /* Reloc const = mapbase - *vaddrbase */
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Elf_Dyn *dynamic; /* Dynamic section */
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caddr_t entry; /* Entry point */
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const Elf_Phdr *__junk001;
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size_t pathlen; /* Pathname length */
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/* Items from the dynamic section. */
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Elf_Addr *pltgot; /* PLTGOT table */
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const Elf_Rel *rel; /* Relocation entries */
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const Elf_Rel *rellim; /* Limit of Relocation entries */
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const Elf_Rela *rela; /* Relocation entries */
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const Elf_Rela *relalim; /* Limit of Relocation entries */
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const Elf_Rel *pltrel; /* PLT relocation entries */
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const Elf_Rel *pltrellim; /* Limit of PLT relocation entries */
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const Elf_Rela *pltrela; /* PLT relocation entries */
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const Elf_Rela *pltrelalim; /* Limit of PLT relocation entries */
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const Elf_Sym *symtab; /* Symbol table */
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const char *strtab; /* String table */
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unsigned long strsize; /* Size in bytes of string table */
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#ifdef __mips__
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Elf_Word local_gotno; /* Number of local GOT entries */
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Elf_Word symtabno; /* Number of dynamic symbols */
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Elf_Word gotsym; /* First dynamic symbol in GOT */
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#endif
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const Elf_Word *buckets; /* Hash table buckets array */
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unsigned long nbuckets; /* Number of buckets */
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const Elf_Word *chains; /* Hash table chain array */
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unsigned long nchains; /* Number of chains */
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Search_Path *rpaths; /* Search path specified in object */
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Needed_Entry *needed; /* Shared objects needed by this (%) */
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void (*init)(void); /* Initialization function to call */
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void (*fini)(void); /* Termination function to call */
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/* Entry points for dlopen() and friends. */
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void *(*dlopen)(const char *, int);
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void *(*dlsym)(void *, const char *);
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char *(*dlerror)(void);
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int (*dlclose)(void *);
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int (*dladdr)(const void *, Dl_info *);
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u_int32_t mainprog:1, /* True if this is the main program */
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rtld:1, /* True if this is the dynamic linker */
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textrel:1, /* True if there are relocations to
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* text seg */
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symbolic:1, /* True if generated with
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* "-Bsymbolic" */
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printed:1, /* True if ldd has printed it */
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isdynamic:1, /* True if this is a pure PIC object */
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mainref:1, /* True if on _rtld_list_main */
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globalref:1; /* True if on _rtld_list_global */
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struct link_map linkmap; /* for GDB */
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/* These items are computed by map_object() or by digest_phdr(). */
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const char *interp; /* Pathname of the interpreter, if any */
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Objlist dldags; /* Object belongs to these dlopened DAGs (%) */
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Objlist dagmembers; /* DAG has these members (%) */
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dev_t dev; /* Object's filesystem's device */
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ino_t ino; /* Object's inode number */
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} Obj_Entry;
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#if defined(_RTLD_SOURCE)
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extern struct r_debug _rtld_debug;
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extern Search_Path *_rtld_default_paths;
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extern Obj_Entry *_rtld_objlist;
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extern Obj_Entry **_rtld_objtail;
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extern Obj_Entry *_rtld_objmain;
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extern Obj_Entry _rtld_objself;
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extern Search_Path *_rtld_paths;
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extern Library_Xform *_rtld_xforms;
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extern bool _rtld_trust;
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extern Objlist _rtld_list_global;
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extern Objlist _rtld_list_main;
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extern Elf_Sym _rtld_sym_zero;
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/* rtld.c */
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void _rtld_error(const char *, ...)
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__attribute__((__format__(__printf__,1,2)));
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void _rtld_die(void);
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char *_rtld_dlerror(void);
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void *_rtld_dlopen(const char *, int);
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void *_rtld_objmain_sym(const char *);
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void *_rtld_dlsym(void *, const char *);
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int _rtld_dlclose(void *);
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int _rtld_dladdr(const void *, Dl_info *);
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void _rtld_debug_state(void);
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void _rtld_linkmap_add(Obj_Entry *);
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void _rtld_linkmap_delete(Obj_Entry *);
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void _rtld_objlist_add(Objlist *, Obj_Entry *);
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Objlist_Entry *_rtld_objlist_find(Objlist *, const Obj_Entry *);
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/* headers.c */
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void _rtld_digest_dynamic(Obj_Entry *);
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Obj_Entry *_rtld_digest_phdr(const Elf_Phdr *, int, caddr_t);
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/* load.c */
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Obj_Entry *_rtld_load_object(char *, int);
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int _rtld_load_needed_objects(Obj_Entry *, int);
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int _rtld_preload(const char *);
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/* path.c */
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void _rtld_add_paths(Search_Path **, const char *);
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void _rtld_process_hints(Search_Path **, Library_Xform **, const char *);
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/* reloc.c */
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int _rtld_do_copy_relocations(const Obj_Entry *);
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int _rtld_relocate_objects(Obj_Entry *, bool);
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int _rtld_relocate_nonplt_objects(const Obj_Entry *);
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int _rtld_relocate_plt_lazy(const Obj_Entry *);
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int _rtld_relocate_plt_objects(const Obj_Entry *);
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void _rtld_setup_pltgot(const Obj_Entry *);
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/* search.c */
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Obj_Entry *_rtld_load_library(const char *, const Obj_Entry *, int);
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/* symbol.c */
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unsigned long _rtld_elf_hash(const char *);
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const Elf_Sym *_rtld_symlook_obj(const char *, unsigned long,
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const Obj_Entry *, bool);
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const Elf_Sym *_rtld_find_symdef(unsigned long, const Obj_Entry *,
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const Obj_Entry **, bool);
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const Elf_Sym *_rtld_symlook_list(const char *, unsigned long,
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const Objlist *, const Obj_Entry **, bool);
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const Elf_Sym *_rtld_symlook_default(const char *, unsigned long,
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const Obj_Entry *, const Obj_Entry **, bool);
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/* map_object.c */
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Obj_Entry *_rtld_map_object(char *, int, const struct stat *);
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void _rtld_obj_free(Obj_Entry *);
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Obj_Entry *_rtld_obj_new(void);
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/* function descriptors */
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#ifdef __HAVE_FUNCTION_DESCRIPTORS
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Elf_Addr _rtld_function_descriptor_alloc(const Obj_Entry *,
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const Elf_Sym *, Elf_Addr);
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const void *_rtld_function_descriptor_function(const void *);
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#endif /* __HAVE_FUNCTION_DESCRIPTORS */
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#endif /* _RTLD_SOURCE */
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#endif /* RTLD_H */
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