142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
/* $NetBSD: load.c,v 1.1 1996/12/16 20:37:59 cgd 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.
|
|
*/
|
|
|
|
/*
|
|
* Dynamic linker for ELF.
|
|
*
|
|
* John Polstra <jdp@polstra.com>.
|
|
*/
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <dirent.h>
|
|
|
|
#include "debug.h"
|
|
#include "rtld.h"
|
|
|
|
/*
|
|
* Load a shared object into memory, if it is not already loaded. The
|
|
* argument must be a string allocated on the heap. This function assumes
|
|
* responsibility for freeing it when necessary.
|
|
*
|
|
* Returns a pointer to the Obj_Entry for the object. Returns NULL
|
|
* on failure.
|
|
*/
|
|
Obj_Entry *
|
|
_rtld_load_object(
|
|
char *filepath)
|
|
{
|
|
Obj_Entry *obj;
|
|
|
|
for (obj = _rtld_objlist->next; obj != NULL; obj = obj->next)
|
|
if (strcmp(obj->path, filepath) == 0)
|
|
break;
|
|
|
|
if (obj == NULL) { /* First use of this object, so we must map it in */
|
|
int fd;
|
|
|
|
if ((fd = open(filepath, O_RDONLY)) == -1) {
|
|
_rtld_error("Cannot open \"%s\"", filepath);
|
|
return NULL;
|
|
}
|
|
obj = _rtld_map_object(filepath, fd);
|
|
close(fd);
|
|
if (obj == NULL) {
|
|
free(filepath);
|
|
return NULL;
|
|
}
|
|
|
|
obj->path = filepath;
|
|
_rtld_digest_dynamic(obj);
|
|
|
|
*_rtld_objtail = obj;
|
|
_rtld_objtail = &obj->next;
|
|
#ifdef RTLD_LOADER
|
|
_rtld_linkmap_add(obj); /* for GDB */
|
|
#endif
|
|
|
|
dbg(" %p .. %p: %s", obj->mapbase,
|
|
obj->mapbase + obj->mapsize - 1, obj->path);
|
|
if (obj->textrel)
|
|
dbg(" WARNING: %s has impure text", obj->path);
|
|
} else
|
|
free(filepath);
|
|
|
|
++obj->refcount;
|
|
return obj;
|
|
}
|
|
|
|
/*
|
|
* Given a shared object, traverse its list of needed objects, and load
|
|
* each of them. Returns 0 on success. Generates an error message and
|
|
* returns -1 on failure.
|
|
*/
|
|
int
|
|
_rtld_load_needed_objects(
|
|
Obj_Entry *first)
|
|
{
|
|
Obj_Entry *obj;
|
|
int status = 0;
|
|
|
|
for (obj = first; obj != NULL; obj = obj->next) {
|
|
Needed_Entry *needed;
|
|
|
|
for (needed = obj->needed; needed != NULL; needed = needed->next) {
|
|
const char *name = obj->strtab + needed->name;
|
|
char *libpath = _rtld_find_library(name, obj);
|
|
|
|
if (libpath == NULL) {
|
|
status = -1;
|
|
} else {
|
|
needed->obj = _rtld_load_object(libpath);
|
|
if (needed->obj == NULL)
|
|
status = -1; /* FIXME - cleanup */
|
|
}
|
|
#ifdef RTLD_LOADER
|
|
if (status == -1)
|
|
return status;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|