41fe218b25
kit, then hacked on by Matt Thomas <matt@3am-software.com>, then by me (to make it work with new versions of the toolchain, etc.). This runs, but it's in serious need of cleaning and/or a fair bit of reworking. See the README file for more information, and a list of things to do.
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 $ */
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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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/*
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* Dynamic linker for ELF.
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*
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* John Polstra <jdp@polstra.com>.
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <dirent.h>
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#include "debug.h"
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#include "rtld.h"
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/*
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* Load a shared object into memory, if it is not already loaded. The
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* argument must be a string allocated on the heap. This function assumes
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* responsibility for freeing it when necessary.
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*
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* Returns a pointer to the Obj_Entry for the object. Returns NULL
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* on failure.
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*/
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Obj_Entry *
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_rtld_load_object(
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char *filepath)
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{
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Obj_Entry *obj;
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for (obj = _rtld_objlist->next; obj != NULL; obj = obj->next)
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if (strcmp(obj->path, filepath) == 0)
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break;
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if (obj == NULL) { /* First use of this object, so we must map it in */
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int fd;
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if ((fd = open(filepath, O_RDONLY)) == -1) {
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_rtld_error("Cannot open \"%s\"", filepath);
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return NULL;
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}
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obj = _rtld_map_object(filepath, fd);
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close(fd);
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if (obj == NULL) {
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free(filepath);
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return NULL;
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}
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obj->path = filepath;
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_rtld_digest_dynamic(obj);
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*_rtld_objtail = obj;
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_rtld_objtail = &obj->next;
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#ifdef RTLD_LOADER
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_rtld_linkmap_add(obj); /* for GDB */
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#endif
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dbg(" %p .. %p: %s", obj->mapbase,
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obj->mapbase + obj->mapsize - 1, obj->path);
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if (obj->textrel)
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dbg(" WARNING: %s has impure text", obj->path);
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} else
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free(filepath);
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++obj->refcount;
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return obj;
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}
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/*
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* Given a shared object, traverse its list of needed objects, and load
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* each of them. Returns 0 on success. Generates an error message and
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* returns -1 on failure.
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*/
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int
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_rtld_load_needed_objects(
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Obj_Entry *first)
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{
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Obj_Entry *obj;
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int status = 0;
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for (obj = first; obj != NULL; obj = obj->next) {
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Needed_Entry *needed;
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for (needed = obj->needed; needed != NULL; needed = needed->next) {
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const char *name = obj->strtab + needed->name;
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char *libpath = _rtld_find_library(name, obj);
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if (libpath == NULL) {
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status = -1;
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} else {
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needed->obj = _rtld_load_object(libpath);
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if (needed->obj == NULL)
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status = -1; /* FIXME - cleanup */
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}
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#ifdef RTLD_LOADER
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if (status == -1)
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return status;
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#endif
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}
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}
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return status;
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}
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