uclibc-ng/ldso/ldso/dl-elf.c

/* vi: set sw=4 ts=4: */
/* Program to load an ELF binary on a linux system, and run it
 * after resolving ELF shared library symbols
 *
 * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald, 
 *				David Engel, Hongjiu Lu and Mitch D'Souza
 * Copyright (C) 2001-2003, Erik Andersen
 *
 * 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. The name of the above contributors may not be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``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 CONTRIBUTORS 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.
 */


/* This file contains the helper routines to load an ELF sharable
   library into memory and add the symbol table info to the chain. */

#ifdef USE_CACHE

static caddr_t _dl_cache_addr = NULL;
static size_t _dl_cache_size = 0;

int _dl_map_cache(void)
{
	int fd;
	struct stat st;
	header_t *header;
	libentry_t *libent;
	int i, strtabsize;

	if (_dl_cache_addr == (caddr_t) - 1)
		return -1;
	else if (_dl_cache_addr != NULL)
		return 0;

	if (_dl_stat(LDSO_CACHE, &st)
		|| (fd = _dl_open(LDSO_CACHE, O_RDONLY)) < 0) {
		_dl_dprintf(2, "%s: can't open cache '%s'\n", _dl_progname, LDSO_CACHE);
		_dl_cache_addr = (caddr_t) - 1;	/* so we won't try again */
		return -1;
	}

	_dl_cache_size = st.st_size;
	_dl_cache_addr = (caddr_t) _dl_mmap(0, _dl_cache_size, PROT_READ, MAP_SHARED, fd, 0);
	_dl_close(fd);
	if (_dl_mmap_check_error(_dl_cache_addr)) {
		_dl_dprintf(2, "%s: can't map cache '%s'\n", 
			_dl_progname, LDSO_CACHE);
		return -1;
	}

	header = (header_t *) _dl_cache_addr;

	if (_dl_cache_size < sizeof(header_t) ||
		_dl_memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)
		|| _dl_memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)
		|| _dl_cache_size <
		(sizeof(header_t) + header->nlibs * sizeof(libentry_t))
		|| _dl_cache_addr[_dl_cache_size - 1] != '\0') 
	{
		_dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname, 
			LDSO_CACHE);
		goto fail;
	}

	strtabsize = _dl_cache_size - sizeof(header_t) -
		header->nlibs * sizeof(libentry_t);
	libent = (libentry_t *) & header[1];

	for (i = 0; i < header->nlibs; i++) {
		if (libent[i].sooffset >= strtabsize || 
			libent[i].liboffset >= strtabsize) 
		{
			_dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname, LDSO_CACHE);
			goto fail;
		}
	}

	return 0;

  fail:
	_dl_munmap(_dl_cache_addr, _dl_cache_size);
	_dl_cache_addr = (caddr_t) - 1;
	return -1;
}

int _dl_unmap_cache(void)
{
	if (_dl_cache_addr == NULL || _dl_cache_addr == (caddr_t) - 1)
		return -1;

#if 1
	_dl_munmap(_dl_cache_addr, _dl_cache_size);
	_dl_cache_addr = NULL;
#endif

	return 0;
}

#endif

/* This function's behavior must exactly match that 
 * in uClibc/ldso/util/ldd.c */
static struct elf_resolve * 
search_for_named_library(const char *name, int secure, const char *path_list,
	struct dyn_elf **rpnt)
{
	int i, count = 1;
	char *path, *path_n;
	char mylibname[2050];
	struct elf_resolve *tpnt1;
	
	if (path_list==NULL)
		return NULL;

	/* We need a writable copy of this string */
	path = _dl_strdup(path_list);
	if (!path) {
		_dl_dprintf(2, "Out of memory!\n");
		_dl_exit(0);
	}
	

	/* Unlike ldd.c, don't bother to eliminate double //s */


	/* Replace colons with zeros in path_list and count them */
	for(i=_dl_strlen(path); i > 0; i--) {
		if (path[i]==':') {
			path[i]=0;
			count++;
		}
	}

	path_n = path;
	for (i = 0; i < count; i++) {
		_dl_strcpy(mylibname, path_n); 
		_dl_strcat(mylibname, "/"); 
		_dl_strcat(mylibname, name);
		if ((tpnt1 = _dl_load_elf_shared_library(secure, rpnt, mylibname)) != NULL)
		{
			return tpnt1;
		}
		path_n += (_dl_strlen(path_n) + 1);
	}
	return NULL;
}

/* Check if the named library is already loaded... */
struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname)
{
	const char *pnt, *pnt1;
	struct elf_resolve *tpnt1;
	const char *libname, *libname2;
	static const char *libc = "libc.so.";
	static const char *aborted_wrong_lib = "%s: aborted attempt to load %s!\n";

	pnt = libname = full_libname;

#if defined (__SUPPORT_LD_DEBUG__)
	if(_dl_debug) 
		_dl_dprintf(_dl_debug_file, "Checking if '%s' is already loaded\n", full_libname);
#endif
	/* quick hack to ensure mylibname buffer doesn't overflow.  don't 
	   allow full_libname or any directory to be longer than 1024. */
	if (_dl_strlen(full_libname) > 1024)
		return NULL;

	/* Skip over any initial initial './' and '/' stuff to 
	 * get the short form libname with no path garbage */ 
	pnt1 = _dl_strrchr(pnt, '/');
	if (pnt1) {
		libname = pnt1 + 1;
	}

	/* Make sure they are not trying to load the wrong C library!
	 * This sometimes happens esp with shared libraries when the
	 * library path is somehow wrong! */
#define isdigit(c)  (c >= '0' && c <= '9')
	if ((_dl_strncmp(libname, libc, 8) == 0) &&  _dl_strlen(libname) >=8 &&
			isdigit(libname[8]))
	{
		/* Abort attempts to load glibc, libc5, etc */
		if ( libname[8]!='0') {
			if (!_dl_trace_loaded_objects) {
				_dl_dprintf(2, aborted_wrong_lib, libname, _dl_progname);
				_dl_exit(1);
			}
			return NULL;
		}
	}

	/* Critical step!  Weed out duplicates early to avoid
	 * function aliasing, which wastes memory, and causes
	 * really bad things to happen with weaks and globals. */
	for (tpnt1 = _dl_loaded_modules; tpnt1; tpnt1 = tpnt1->next) {

		/* Skip over any initial initial './' and '/' stuff to 
		 * get the short form libname with no path garbage */ 
		libname2 = tpnt1->libname;
		pnt1 = _dl_strrchr(libname2, '/');
		if (pnt1) {
			libname2 = pnt1 + 1;
		}

		if (_dl_strcmp(libname2, libname) == 0) {
			/* Well, that was certainly easy */
			return tpnt1;
		}
	}

	return NULL;
}
	


/*
 * Used to return error codes back to dlopen et. al.
 */

unsigned long _dl_error_number;
unsigned long _dl_internal_error_number;
extern char *_dl_ldsopath;

struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt,
	struct elf_resolve *tpnt, char *full_libname)
{
	char *pnt, *pnt1;
	struct elf_resolve *tpnt1;
	char *libname;

	_dl_internal_error_number = 0;
	libname = full_libname;

	/* quick hack to ensure mylibname buffer doesn't overflow.  don't 
	   allow full_libname or any directory to be longer than 1024. */
	if (_dl_strlen(full_libname) > 1024)
		goto goof;

	/* Skip over any initial initial './' and '/' stuff to 
	 * get the short form libname with no path garbage */ 
	pnt1 = _dl_strrchr(libname, '/');
	if (pnt1) {
		libname = pnt1 + 1;
	}

	/* Critical step!  Weed out duplicates early to avoid
	 * function aliasing, which wastes memory, and causes
	 * really bad things to happen with weaks and globals. */
	if ((tpnt1=_dl_check_if_named_library_is_loaded(libname))!=NULL)
		return tpnt1;

#if defined (__SUPPORT_LD_DEBUG__)
	if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfind library='%s'; searching\n", libname);
#endif
	/* If the filename has any '/', try it straight and leave it at that.
	   For IBCS2 compatibility under linux, we substitute the string 
	   /usr/i486-sysv4/lib for /usr/lib in library names. */

	if (libname != full_libname) {
#if defined (__SUPPORT_LD_DEBUG__)
		if(_dl_debug) _dl_dprintf(_dl_debug_file, "\ttrying file='%s'\n", full_libname);
#endif
		tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname);
		if (tpnt1) {
			return tpnt1;
		}
		//goto goof;
	}

	/*
	 * The ABI specifies that RPATH is searched before LD_*_PATH or
	 * the default path of /usr/lib.  Check in rpath directories.
	 */
	for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
		if (tpnt->libtype == elf_executable) {
			pnt = (char *) tpnt->dynamic_info[DT_RPATH];
			if (pnt) {
				pnt += (unsigned long) tpnt->loadaddr + tpnt->dynamic_info[DT_STRTAB];
#if defined (__SUPPORT_LD_DEBUG__)
				if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching RPATH='%s'\n", pnt);
#endif
				if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL) 
				{
				    return tpnt1;
				}
			}
		}
	}

	/* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
	if (_dl_library_path) {
#if defined (__SUPPORT_LD_DEBUG__)
		if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
#endif
	    if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt)) != NULL) 
	    {
		return tpnt1;
	    }
	}

	/*
	 * Where should the cache be searched?  There is no such concept in the
	 * ABI, so we have some flexibility here.  For now, search it before
	 * the hard coded paths that follow (i.e before /lib and /usr/lib).
	 */
#ifdef USE_CACHE
	if (_dl_cache_addr != NULL && _dl_cache_addr != (caddr_t) - 1) {
		int i;
		header_t *header = (header_t *) _dl_cache_addr;
		libentry_t *libent = (libentry_t *) & header[1];
		char *strs = (char *) &libent[header->nlibs];

#if defined (__SUPPORT_LD_DEBUG__)
		if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching cache='%s'\n", LDSO_CACHE);
#endif
		for (i = 0; i < header->nlibs; i++) {
			if ((libent[i].flags == LIB_ELF ||
				 libent[i].flags == LIB_ELF_LIBC5) &&
				_dl_strcmp(libname, strs + libent[i].sooffset) == 0 &&
				(tpnt1 = _dl_load_elf_shared_library(secure, 
				     rpnt, strs + libent[i].liboffset)))
				return tpnt1;
		}
	}
#endif

	/* Look for libraries wherever the shared library loader
	 * was installed */
#if defined (__SUPPORT_LD_DEBUG__)
		if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching ldso dir='%s'\n", _dl_ldsopath);
#endif
	if ((tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt)) != NULL) 
	{
	    return tpnt1;
	}


	/* Lastly, search the standard list of paths for the library.
	   This list must exactly match the list in uClibc/ldso/util/ldd.c */
#if defined (__SUPPORT_LD_DEBUG__)
	if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching full lib path list\n");
#endif
	if ((tpnt1 = search_for_named_library(libname, secure, 
			UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib:"
			UCLIBC_RUNTIME_PREFIX "usr/lib:"
			UCLIBC_RUNTIME_PREFIX "lib:"
			"/usr/lib:"
			"/lib", rpnt)
		    ) != NULL) 
	{
	    return tpnt1;
	}

goof:
	/* Well, we shot our wad on that one.  All we can do now is punt */
	if (_dl_internal_error_number)
		_dl_error_number = _dl_internal_error_number;
	else
		_dl_error_number = LD_ERROR_NOFILE;
#if defined (__SUPPORT_LD_DEBUG__)
	if(_dl_debug) _dl_dprintf(2, "Bummer: could not find '%s'!\n", libname);
#endif
	return NULL;
}


/*
 * Read one ELF library into memory, mmap it into the correct locations and
 * add the symbol info to the symbol chain.  Perform any relocations that
 * are required.
 */

struct elf_resolve *_dl_load_elf_shared_library(int secure,
	struct dyn_elf **rpnt, char *libname)
{
	ElfW(Ehdr) *epnt;
	unsigned long dynamic_addr = 0;
	unsigned long dynamic_size = 0;
	Elf32_Dyn *dpnt;
	struct elf_resolve *tpnt;
	ElfW(Phdr) *ppnt;
	char *status, *header;
	unsigned long dynamic_info[24];
	unsigned long *lpnt;
	unsigned long libaddr;
	unsigned long minvma = 0xffffffff, maxvma = 0;
	int i, flags, piclib, infile;

	/* If this file is already loaded, skip this step */
	tpnt = _dl_check_hashed_files(libname);
	if (tpnt) {
		if (*rpnt) {
			(*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
			_dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
			(*rpnt)->next->prev = (*rpnt);
			*rpnt = (*rpnt)->next;
			(*rpnt)->dyn = tpnt;
			tpnt->symbol_scope = _dl_symbol_tables;
		}
		tpnt->usage_count++;
		tpnt->libtype = elf_lib;
#if defined (__SUPPORT_LD_DEBUG__)
		if(_dl_debug) _dl_dprintf(2, "file='%s';  already loaded\n", libname);
#endif
		return tpnt;
	}

	/* If we are in secure mode (i.e. a setu/gid binary using LD_PRELOAD),
	   we don't load the library if it isn't setuid. */

	if (secure) {
		struct stat st;

		if (_dl_stat(libname, &st) || !(st.st_mode & S_ISUID))
			return NULL;
	}

	libaddr = 0;
	infile = _dl_open(libname, O_RDONLY);
	if (infile < 0) {
#if 0
		/*
		 * NO!  When we open shared libraries we may search several paths.
		 * it is inappropriate to generate an error here.
		 */
		_dl_dprintf(2, "%s: can't open '%s'\n", _dl_progname, libname);
#endif
		_dl_internal_error_number = LD_ERROR_NOFILE;
		return NULL;
	}

	 header = _dl_mmap((void *) 0, PAGE_SIZE, PROT_READ | PROT_WRITE,
	 	MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
	if (_dl_mmap_check_error(header)) {
		_dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
		_dl_internal_error_number = LD_ERROR_MMAP_FAILED;
		_dl_close(infile);
		return NULL;
	};
        
	_dl_read(infile, header, PAGE_SIZE);
	epnt = (ElfW(Ehdr) *) (intptr_t) header;
	if (epnt->e_ident[0] != 0x7f ||
		epnt->e_ident[1] != 'E' || 
		epnt->e_ident[2] != 'L' || 
		epnt->e_ident[3] != 'F') 
	{
		_dl_dprintf(2, "%s: '%s' is not an ELF file\n", _dl_progname,
					 libname);
		_dl_internal_error_number = LD_ERROR_NOTELF;
		_dl_close(infile);
		_dl_munmap(header, PAGE_SIZE);
		return NULL;
	};

	if ((epnt->e_type != ET_DYN) || (epnt->e_machine != MAGIC1 
#ifdef MAGIC2
		    && epnt->e_machine != MAGIC2
#endif
		)) 
	{
		_dl_internal_error_number = 
		    (epnt->e_type != ET_DYN ? LD_ERROR_NOTDYN : LD_ERROR_NOTMAGIC);
		_dl_dprintf(2, "%s: '%s' is not an ELF executable for " ELF_TARGET 
			"\n", _dl_progname, libname);
		_dl_close(infile);
		_dl_munmap(header, PAGE_SIZE);
		return NULL;
	};

	ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];

	piclib = 1;
	for (i = 0; i < epnt->e_phnum; i++) {

		if (ppnt->p_type == PT_DYNAMIC) {
			if (dynamic_addr)
				_dl_dprintf(2, "%s: '%s' has more than one dynamic section\n", 
					_dl_progname, libname);
			dynamic_addr = ppnt->p_vaddr;
			dynamic_size = ppnt->p_filesz;
		};

		if (ppnt->p_type == PT_LOAD) {
			/* See if this is a PIC library. */
			if (i == 0 && ppnt->p_vaddr > 0x1000000) {
				piclib = 0;
				minvma = ppnt->p_vaddr;
			}
			if (piclib && ppnt->p_vaddr < minvma) {
				minvma = ppnt->p_vaddr;
			}
			if (((unsigned long) ppnt->p_vaddr + ppnt->p_memsz) > maxvma) {
				maxvma = ppnt->p_vaddr + ppnt->p_memsz;
			}
		}
		ppnt++;
	};

	maxvma = (maxvma + ADDR_ALIGN) & ~ADDR_ALIGN;
	minvma = minvma & ~0xffffU;

	flags = MAP_PRIVATE /*| MAP_DENYWRITE */ ;
	if (!piclib)
		flags |= MAP_FIXED;

	status = (char *) _dl_mmap((char *) (piclib ? 0 : minvma), 
		maxvma - minvma, PROT_NONE, flags | MAP_ANONYMOUS, -1, 0);
	if (_dl_mmap_check_error(status)) {
		_dl_dprintf(2, "%s: can't map %s\n", _dl_progname, libname);
		_dl_internal_error_number = LD_ERROR_MMAP_FAILED;
		_dl_close(infile);
		_dl_munmap(header, PAGE_SIZE);
		return NULL;
	};
	libaddr = (unsigned long) status;
	flags |= MAP_FIXED;

	/* Get the memory to store the library */
	ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];

	for (i = 0; i < epnt->e_phnum; i++) {
		if (ppnt->p_type == PT_LOAD) {

			/* See if this is a PIC library. */
			if (i == 0 && ppnt->p_vaddr > 0x1000000) {
				piclib = 0;
				/* flags |= MAP_FIXED; */
			}



			if (ppnt->p_flags & PF_W) {
				unsigned long map_size;
				char *cpnt;

				status = (char *) _dl_mmap((char *) ((piclib ? libaddr : 0) + 
					(ppnt->p_vaddr & PAGE_ALIGN)), (ppnt->p_vaddr & ADDR_ALIGN) 
					+ ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags, infile, 
					ppnt->p_offset & OFFS_ALIGN);

				if (_dl_mmap_check_error(status)) {
					_dl_dprintf(2, "%s: can't map '%s'\n", 
						_dl_progname, libname);
					_dl_internal_error_number = LD_ERROR_MMAP_FAILED;
					_dl_munmap((char *) libaddr, maxvma - minvma);
					_dl_close(infile);
					_dl_munmap(header, PAGE_SIZE);
					return NULL;
				};

				/* Pad the last page with zeroes. */
				cpnt = (char *) (status + (ppnt->p_vaddr & ADDR_ALIGN) +
							  ppnt->p_filesz);
				while (((unsigned long) cpnt) & ADDR_ALIGN)
					*cpnt++ = 0;

				/* I am not quite sure if this is completely
				 * correct to do or not, but the basic way that
				 * we handle bss segments is that we mmap
				 * /dev/zero if there are any pages left over
				 * that are not mapped as part of the file */

				map_size = (ppnt->p_vaddr + ppnt->p_filesz + ADDR_ALIGN) & PAGE_ALIGN;

				if (map_size < ppnt->p_vaddr + ppnt->p_memsz)
					status = (char *) _dl_mmap((char *) map_size + 
						(piclib ? libaddr : 0), 
						ppnt->p_vaddr + ppnt->p_memsz - map_size, 
						LXFLAGS(ppnt->p_flags), flags | MAP_ANONYMOUS, -1, 0);
			} else
				status = (char *) _dl_mmap((char *) (ppnt->p_vaddr & PAGE_ALIGN) 
					+ (piclib ? libaddr : 0), (ppnt->p_vaddr & ADDR_ALIGN) + 
					ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags, 
					infile, ppnt->p_offset & OFFS_ALIGN);
			if (_dl_mmap_check_error(status)) {
				_dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
				_dl_internal_error_number = LD_ERROR_MMAP_FAILED;
				_dl_munmap((char *) libaddr, maxvma - minvma);
				_dl_close(infile);
				_dl_munmap(header, PAGE_SIZE);
				return NULL;
			};

			/* if(libaddr == 0 && piclib) {
			   libaddr = (unsigned long) status;
			   flags |= MAP_FIXED;
			   }; */
		};
		ppnt++;
	};
	_dl_close(infile);

	/* For a non-PIC library, the addresses are all absolute */
	if (piclib) {
		dynamic_addr += (unsigned long) libaddr;
	}

	/* 
	 * OK, the ELF library is now loaded into VM in the correct locations
	 * The next step is to go through and do the dynamic linking (if needed).
	 */

	/* Start by scanning the dynamic section to get all of the pointers */

	if (!dynamic_addr) {
		_dl_internal_error_number = LD_ERROR_NODYNAMIC;
		_dl_dprintf(2, "%s: '%s' is missing a dynamic section\n", 
			_dl_progname, libname);
			_dl_munmap(header, PAGE_SIZE);
		return NULL;
	}

	dpnt = (Elf32_Dyn *) dynamic_addr;

	dynamic_size = dynamic_size / sizeof(Elf32_Dyn);
	_dl_memset(dynamic_info, 0, sizeof(dynamic_info));

#if defined(__mips__)
	{
		
		int indx = 1;
		Elf32_Dyn *dpnt = (Elf32_Dyn *) dynamic_addr;

		while(dpnt->d_tag) {
			dpnt++;
			indx++;
		}
		dynamic_size = indx;
	}
#endif

	{
		unsigned long indx;

		for (indx = 0; indx < dynamic_size; indx++) 
		{
			if (dpnt->d_tag > DT_JMPREL) {
				dpnt++;
				continue;
			}
			dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
			if (dpnt->d_tag == DT_TEXTREL)
				dynamic_info[DT_TEXTREL] = 1;
			dpnt++;
		};
	}

	/* If the TEXTREL is set, this means that we need to make the pages
	   writable before we perform relocations.  Do this now. They get set
	   back again later. */

	if (dynamic_info[DT_TEXTREL]) {
#ifndef FORCE_SHAREABLE_TEXT_SEGMENTS
		ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
		for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
			if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
				_dl_mprotect((void *) ((piclib ? libaddr : 0) + 
					    (ppnt->p_vaddr & PAGE_ALIGN)), 
					(ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz, 
					PROT_READ | PROT_WRITE | PROT_EXEC);
		}
#else
		_dl_dprintf(_dl_debug_file, "Can't modify %s's text section. Use GCC option -fPIC for shared objects, please.\n",libname);
		_dl_exit(1);
#endif		
	}

	tpnt = _dl_add_elf_hash_table(libname, (char *) libaddr, dynamic_info, 
		dynamic_addr, dynamic_size);

	tpnt->ppnt = (ElfW(Phdr) *)(intptr_t) (tpnt->loadaddr + epnt->e_phoff);
	tpnt->n_phent = epnt->e_phnum;

	/*
	 * Add this object into the symbol chain
	 */
	if (*rpnt) {
		(*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
		_dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
		(*rpnt)->next->prev = (*rpnt);
		*rpnt = (*rpnt)->next;
		(*rpnt)->dyn = tpnt;
		tpnt->symbol_scope = _dl_symbol_tables;
	}
	tpnt->usage_count++;
	tpnt->libtype = elf_lib;

	/*
	 * OK, the next thing we need to do is to insert the dynamic linker into
	 * the proper entry in the GOT so that the PLT symbols can be properly
	 * resolved. 
	 */

	lpnt = (unsigned long *) dynamic_info[DT_PLTGOT];

	if (lpnt) {
		lpnt = (unsigned long *) (dynamic_info[DT_PLTGOT] +
			((int) libaddr));
		INIT_GOT(lpnt, tpnt);
	};

#if defined (__SUPPORT_LD_DEBUG__)
	if(_dl_debug) {
		_dl_dprintf(2, "\n\tfile='%s';  generating link map\n", libname);
		_dl_dprintf(2, "\t\tdynamic: %x  base: %x   size: %x\n", 
				dynamic_addr, libaddr, dynamic_size);
		_dl_dprintf(2, "\t\t  entry: %x  phdr: %x  phnum: %d\n\n", 
				epnt->e_entry + libaddr, tpnt->ppnt, tpnt->n_phent);

	}
#endif
	_dl_munmap(header, PAGE_SIZE);

	return tpnt;
}

/* Minimal printf which handles only %s, %d, and %x */
void _dl_dprintf(int fd, const char *fmt, ...)
{
	int num;
	va_list args;
	char *start, *ptr, *string;
	static char *buf;

	buf = _dl_mmap((void *) 0, PAGE_SIZE, PROT_READ | PROT_WRITE,
		MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
	if (_dl_mmap_check_error(buf)) {
			_dl_write(fd, "mmap of a spare page failed!\n", 29); 
			_dl_exit(20);
	}

	start = ptr = buf;

	if (!fmt)
		return;

	if (_dl_strlen(fmt) >= (PAGE_SIZE - 1)) {
		_dl_write(fd, "overflow\n", 11);
		_dl_exit(20);
	}

	_dl_strcpy(buf, fmt);
	va_start(args, fmt);

	while (start) {
		while (*ptr != '%' && *ptr) {
			ptr++;
		}

		if (*ptr == '%') {
			*ptr++ = '\0';
			_dl_write(fd, start, _dl_strlen(start));

			switch (*ptr++) {
			case 's':
				string = va_arg(args, char *);

				if (!string)
					_dl_write(fd, "(null)", 6);
				else
					_dl_write(fd, string, _dl_strlen(string));
				break;

			case 'i':
			case 'd':
			{
				char tmp[22];
				num = va_arg(args, int);

				string = _dl_simple_ltoa(tmp, num);
				_dl_write(fd, string, _dl_strlen(string));
				break;
			}
			case 'x':
			case 'X':
			{
				char tmp[22];
				num = va_arg(args, int);

				string = _dl_simple_ltoahex(tmp, num);
				_dl_write(fd, string, _dl_strlen(string));
				break;
			}
			default:
				_dl_write(fd, "(null)", 6);
				break;
			}

			start = ptr;
		} else {
			_dl_write(fd, start, _dl_strlen(start));
			start = NULL;
		}
	}
	_dl_munmap(buf, PAGE_SIZE);
	return;
}

char *_dl_strdup(const char *string)
{
	char *retval;
	int len;

	len = _dl_strlen(string);
	retval = _dl_malloc(len + 1);
	_dl_strcpy(retval, string);
	return retval;
}

void *(*_dl_malloc_function) (size_t size) = NULL;
void *_dl_malloc(int size)
{
	void *retval;

#if 0
#ifdef __SUPPORT_LD_DEBUG_EARLY__
	_dl_dprintf(2, "malloc: request for %d bytes\n", size);
#endif
#endif

	if (_dl_malloc_function)
		return (*_dl_malloc_function) (size);

	if (_dl_malloc_addr - _dl_mmap_zero + size > PAGE_SIZE) {
#ifdef __SUPPORT_LD_DEBUG_EARLY__
		_dl_dprintf(2, "malloc: mmapping more memory\n");
#endif
		_dl_mmap_zero = _dl_malloc_addr = _dl_mmap((void *) 0, size, 
				PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
		if (_dl_mmap_check_error(_dl_mmap_zero)) {
			_dl_dprintf(2, "%s: mmap of a spare page failed!\n", _dl_progname);
			_dl_exit(20);
		}
	}
	retval = _dl_malloc_addr;
	_dl_malloc_addr += size;

	/*
	 * Align memory to 4 byte boundary.  Some platforms require this, others
	 * simply get better performance.
	 */
	_dl_malloc_addr = (char *) (((unsigned long) _dl_malloc_addr + 3) & ~(3));
	return retval;
}

int _dl_fixup(struct dyn_elf *rpnt, int flag)
{
	int goof = 0;
	struct elf_resolve *tpnt;

	if (rpnt->next)
		goof += _dl_fixup(rpnt->next, flag);
	tpnt = rpnt->dyn;

#if defined (__SUPPORT_LD_DEBUG__)
	if(_dl_debug) _dl_dprintf(_dl_debug_file,"\nrelocation processing: %s", tpnt->libname);
#endif

	if (unlikely(tpnt->dynamic_info[UNSUPPORTED_RELOC_TYPE])) {
#if defined (__SUPPORT_LD_DEBUG__)
		if(_dl_debug) {
			_dl_dprintf(2, "%s: can't handle %s relocation records\n",
					_dl_progname, UNSUPPORTED_RELOC_STR);
		}
#endif
		goof++;
		return goof;
	}

	if (tpnt->dynamic_info[DT_RELOC_TABLE_ADDR]) {
		if (tpnt->init_flag & RELOCS_DONE)
			return goof;
		tpnt->init_flag |= RELOCS_DONE;
		goof += _dl_parse_relocation_information(rpnt,
				tpnt->dynamic_info[DT_RELOC_TABLE_ADDR],
				tpnt->dynamic_info[DT_RELOC_TABLE_SIZE], 0);
	}

	if (tpnt->dynamic_info[DT_JMPREL]) {
		if (tpnt->init_flag & JMP_RELOCS_DONE)
			return goof;
		tpnt->init_flag |= JMP_RELOCS_DONE;
		if (flag & RTLD_LAZY) {
			_dl_parse_lazy_relocation_information(rpnt,
					tpnt->dynamic_info[DT_JMPREL],
					tpnt->dynamic_info [DT_PLTRELSZ], 0);
		} else {
			goof += _dl_parse_relocation_information(rpnt,
					tpnt->dynamic_info[DT_JMPREL],
					tpnt->dynamic_info[DT_PLTRELSZ], 0);
		}
	}

	if (tpnt->init_flag & COPY_RELOCS_DONE)
		return goof;
	tpnt->init_flag |= COPY_RELOCS_DONE;
	goof += _dl_parse_copy_information(rpnt,
		tpnt->dynamic_info[DT_RELOC_TABLE_ADDR],
		tpnt->dynamic_info[DT_RELOC_TABLE_SIZE], 0);

#if defined (__SUPPORT_LD_DEBUG__)
	if(_dl_debug) {
		_dl_dprintf(_dl_debug_file,"\nrelocation processing: %s", tpnt->libname);
		_dl_dprintf(_dl_debug_file,"; finished\n\n");
	}
#endif

	return goof;
}