fd1f5e8f1b
strcmp() by performing path name length comparison first. In the test with Mozilla, the number was reduced to 1068 from 7182 (yes, we saved 6114 strcmp()!).
279 lines
9.8 KiB
C
279 lines
9.8 KiB
C
/* $NetBSD: rtld.h,v 1.65 2002/12/05 04:56:57 junyoung 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) /* Initialization function to call */
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__P((void));
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void (*fini) /* Termination function to call */
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__P((void));
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/* Entry points for dlopen() and friends. */
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void *(*dlopen) __P((const char *, int));
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void *(*dlsym) __P((void *, const char *));
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char *(*dlerror) __P((void));
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int (*dlclose) __P((void *));
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int (*dladdr) __P((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 __P((const char *, ...))
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__attribute__((__format__(__printf__,1,2)));
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void _rtld_die __P((void));
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char *_rtld_dlerror __P((void));
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void *_rtld_dlopen __P((const char *, int));
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void *_rtld_objmain_sym __P((const char *));
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void *_rtld_dlsym __P((void *, const char *));
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int _rtld_dlclose __P((void *));
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int _rtld_dladdr __P((const void *, Dl_info *));
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void _rtld_debug_state __P((void));
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void _rtld_linkmap_add __P((Obj_Entry *));
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void _rtld_linkmap_delete __P((Obj_Entry *));
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void _rtld_objlist_add __P((Objlist *, Obj_Entry *));
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Objlist_Entry *_rtld_objlist_find __P((Objlist *, const Obj_Entry *));
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/* headers.c */
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void _rtld_digest_dynamic __P((Obj_Entry *));
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Obj_Entry *_rtld_digest_phdr __P((const Elf_Phdr *, int, caddr_t));
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/* load.c */
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Obj_Entry *_rtld_load_object __P((char *, int));
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int _rtld_load_needed_objects __P((Obj_Entry *, int));
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int _rtld_preload __P((const char *));
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/* path.c */
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void _rtld_add_paths __P((Search_Path **, const char *));
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void _rtld_process_hints __P((Search_Path **, Library_Xform **, const char *));
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/* reloc.c */
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int _rtld_do_copy_relocations __P((const Obj_Entry *));
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int _rtld_relocate_objects __P((Obj_Entry *, bool));
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int _rtld_relocate_nonplt_objects __P((const Obj_Entry *));
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int _rtld_relocate_plt_lazy __P((const Obj_Entry *));
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int _rtld_relocate_plt_objects __P((const Obj_Entry *));
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void _rtld_setup_pltgot __P((const Obj_Entry *));
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/* search.c */
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Obj_Entry *_rtld_load_library __P((const char *, const Obj_Entry *, int));
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/* symbol.c */
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unsigned long _rtld_elf_hash __P((const char *));
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const Elf_Sym *_rtld_symlook_obj __P((const char *, unsigned long,
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const Obj_Entry *, bool));
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const Elf_Sym *_rtld_find_symdef __P((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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/* map_object.c */
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Obj_Entry *_rtld_map_object __P((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 __P((const Obj_Entry *,
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const Elf_Sym *, Elf_Addr));
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const void *_rtld_function_descriptor_function __P((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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