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Diffstat (limited to 'libexec/rtld-elf/rtld.h')
-rw-r--r-- | libexec/rtld-elf/rtld.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/libexec/rtld-elf/rtld.h b/libexec/rtld-elf/rtld.h new file mode 100644 index 0000000..cbd7d8b --- /dev/null +++ b/libexec/rtld-elf/rtld.h @@ -0,0 +1,122 @@ +/*- + * Copyright 1996-1998 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. + * + * $Id: rtld.h,v 1.3 1998/03/06 14:00:09 jdp Exp $ + */ + +#ifndef RTLD_H /* { */ +#define RTLD_H 1 + +#include <sys/types.h> + +#include <elf.h> +#include <stddef.h> + +#ifndef STANDARD_LIBRARY_PATH +#define STANDARD_LIBRARY_PATH "/usr/lib/elf:/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 + +struct Struct_Obj_Entry; + +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; + +/* + * Shared object descriptor. + * + * Items marked with "(%)" are dynamically allocated, and must be freed + * when the structure is destroyed. + */ +typedef struct Struct_Obj_Entry { + /* + * These two items have to be set right for compatibility with the + * original ElfKit crt1.o. + */ + 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 */ + Elf32_Addr vaddrbase; /* Base address in shared object file */ + caddr_t relocbase; /* Relocation constant = mapbase - vaddrbase */ + const Elf32_Dyn *dynamic; /* Dynamic section */ + caddr_t entry; /* Entry point */ + const Elf32_Phdr *phdr; /* Program header if it is mapped, else NULL */ + size_t phsize; /* Size of program header in bytes */ + + /* Items from the dynamic section. */ + Elf32_Addr *got; /* GOT table */ + const Elf32_Rel *rel; /* Relocation entries */ + unsigned long relsize; /* Size in bytes of relocation info */ + const Elf32_Rel *pltrel; /* PLT relocation entries */ + unsigned long pltrelsize; /* Size in bytes of PLT relocation info */ + const Elf32_Sym *symtab; /* Symbol table */ + const char *strtab; /* String table */ + unsigned long strsize; /* Size in bytes of string table */ + + const Elf32_Word *buckets; /* Hash table buckets array */ + unsigned long nbuckets; /* Number of buckets */ + const Elf32_Word *chains; /* Hash table chain array */ + unsigned long nchains; /* Number of chains */ + + const char *rpath; /* Search path specified in object */ + Needed_Entry *needed; /* Shared objects needed by this one (%) */ + + void (*init)(void); /* Initialization function to call */ + void (*fini)(void); /* Termination function to call */ + + bool mainprog; /* True if this is the main program */ + bool rtld; /* True if this is the dynamic linker */ + bool textrel; /* True if there are relocations to text seg */ + bool symbolic; /* True if generated with "-Bsymbolic" */ +} Obj_Entry; + +#define RTLD_MAGIC 0xd550b87a +#define RTLD_VERSION 1 + +extern void _rtld_error(const char *, ...); +extern Obj_Entry *map_object(int); +extern void *xcalloc(size_t); +extern void *xmalloc(size_t); +extern char *xstrdup(const char *); + +#endif /* } */ |