uclibc-ng/ldso/ldso/ldso.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) 2000-2004 by Erik Andersen <andersen@codpoet.org>
 * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
 *				David Engel, Hongjiu Lu and Mitch D'Souza
 *
 * 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.
 */


#include "ldso.h"

#define ALLOW_ZERO_PLTGOT

/* Pull in the value of _dl_progname */
#include "dl-progname.h"

/* Global variables used within the shared library loader */
char *_dl_library_path         = 0;		/* Where we look for libraries */
char *_dl_preload              = 0;		/* Things to be loaded before the libs */
char *_dl_ldsopath             = 0;		/* Location of the shared lib loader */
unsigned long *_dl_brkp        = 0;		/* The end of the data segment for brk and sbrk */
unsigned long *_dl_envp        = 0;		/* The environment address */
int _dl_secure                 = 1;		/* Are we dealing with setuid stuff? */
int _dl_errno                  = 0;     /* We can't use the real errno in ldso */
size_t _dl_pagesize            = 0;		/* Store the page size for use later */
struct r_debug *_dl_debug_addr = NULL;  /* Used to communicate with the gdb debugger */



#ifdef __SUPPORT_LD_DEBUG__
char *_dl_debug           = 0;
char *_dl_debug_symbols   = 0;
char *_dl_debug_move      = 0;
char *_dl_debug_reloc     = 0;
char *_dl_debug_detail    = 0;
char *_dl_debug_nofixups  = 0;
char *_dl_debug_bindings  = 0;
int   _dl_debug_file      = 2;
#endif

/* Forward function declarations */
static int _dl_suid_ok(void);

/*
 * This stub function is used by some debuggers.  The idea is that they
 * can set an internal breakpoint on it, so that we are notified when the
 * address mapping is changed in some way.
 */
void _dl_debug_state(void)
{
}

static unsigned char *_dl_malloc_addr = 0;		/* Lets _dl_malloc use the already allocated memory page */
static unsigned char *_dl_mmap_zero   = 0;		/* Also used by _dl_malloc */



#if defined (__SUPPORT_LD_DEBUG__)
static void debug_fini (int status, void *arg)
{
	(void)status;
	_dl_dprintf(_dl_debug_file,"\ncalling fini: %s\n\n", (const char*)arg);
}
#endif

void _dl_get_ready_to_run(struct elf_resolve *tpnt, struct elf_resolve *app_tpnt,
		unsigned long load_addr, unsigned long *hash_addr,
		Elf32_auxv_t auxvt[AT_EGID + 1], char **envp, struct r_debug *debug_addr,
		unsigned char *malloc_buffer, unsigned char *mmap_zero, char **argv)
{
	ElfW(Phdr) *ppnt;
	char *lpntstr;
	int i, goof = 0, be_lazy = RTLD_LAZY, trace_loaded_objects = 0;
	struct dyn_elf *rpnt;
	struct elf_resolve *tcurr;
	struct elf_resolve *tpnt1;
	unsigned long brk_addr, *lpnt;
	int (*_dl_atexit) (void *);
#if defined (__SUPPORT_LD_DEBUG__)
	int (*_dl_on_exit) (void (*FUNCTION)(int STATUS, void *ARG),void*);
#endif

#ifdef __SUPPORT_LD_DEBUG_EARLY__
	/* Wahoo!!! */
	SEND_STDERR("Cool, we managed to make a function call.\n");
#endif

	/* Make it so _dl_malloc can use the page of memory we have already
	 * allocated.  We shouldn't need to grab any more memory.  This must
	 * be first since things like _dl_dprintf() use _dl_malloc().... */
	_dl_malloc_addr = malloc_buffer;
	_dl_mmap_zero = mmap_zero;

	/* Store the page size for later use */
	_dl_pagesize = (auxvt[AT_PAGESZ].a_un.a_val)? auxvt[AT_PAGESZ].a_un.a_val : PAGE_SIZE;

	/* Now we have done the mandatory linking of some things.  We are now
	 * free to start using global variables, since these things have all been
	 * fixed up by now.  Still no function calls outside of this library ,
	 * since the dynamic resolver is not yet ready. */
	if (argv[0]) {
		_dl_progname = argv[0];
	}

	/* Start to build the tables of the modules that are required for
	 * this beast to run.  We start with the basic executable, and then
	 * go from there.  Eventually we will run across ourself, and we
	 * will need to properly deal with that as well. */
	lpnt = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + load_addr);

	tpnt->chains = hash_addr;
	tpnt->next = 0;
	tpnt->libname = 0;
	tpnt->libtype = program_interpreter;
	tpnt->loadaddr = (ElfW(Addr)) load_addr;

#ifdef ALLOW_ZERO_PLTGOT
	if (tpnt->dynamic_info[DT_PLTGOT])
#endif
	{
		INIT_GOT(lpnt, tpnt);
#ifdef __SUPPORT_LD_DEBUG_EARLY__
		_dl_dprintf(_dl_debug_file, "GOT found at %x\n", lpnt);
#endif
	}

	/* OK, this was a big step, now we need to scan all of the user images
	   and load them properly. */
	{
		ElfW(Ehdr) *epnt;
		ElfW(Phdr) *myppnt;
		int j;

		epnt = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_ptr;
		tpnt->n_phent = epnt->e_phnum;
		tpnt->ppnt = myppnt = (ElfW(Phdr) *) (load_addr + epnt->e_phoff);
		for (j = 0; j < epnt->e_phnum; j++, myppnt++) {
			if (myppnt->p_type == PT_DYNAMIC) {
				tpnt->dynamic_addr = (ElfW(Dyn) *)myppnt->p_vaddr + load_addr;
				tpnt->dynamic_size = myppnt->p_filesz;
			}
		}
	}

	brk_addr = 0;
	rpnt = NULL;

	/* At this point we are now free to examine the user application,
	   and figure out which libraries are supposed to be called.  Until
	   we have this list, we will not be completely ready for dynamic linking */

	ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
	for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++) {
		if (ppnt->p_type == PT_LOAD) {
			if (ppnt->p_vaddr + app_tpnt->loadaddr + ppnt->p_memsz > brk_addr)
				brk_addr = ppnt->p_vaddr + app_tpnt->loadaddr + ppnt->p_memsz;
		}
		if (ppnt->p_type == PT_DYNAMIC) {
#ifndef ALLOW_ZERO_PLTGOT
			/* make sure it's really there. */
			if (app_tpnt->dynamic_info[DT_PLTGOT] == 0)
				continue;
#endif
			/* OK, we have what we need - slip this one into the list. */
			app_tpnt = _dl_add_elf_hash_table("", (char *)app_tpnt->loadaddr,
					app_tpnt->dynamic_info, ppnt->p_vaddr + app_tpnt->loadaddr, ppnt->p_filesz);
			_dl_loaded_modules->libtype = elf_executable;
			_dl_loaded_modules->ppnt = (ElfW(Phdr) *) auxvt[AT_PHDR].a_un.a_ptr;
			_dl_loaded_modules->n_phent = auxvt[AT_PHNUM].a_un.a_val;
			_dl_symbol_tables = rpnt = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
			_dl_memset(rpnt, 0, sizeof(struct dyn_elf));
			rpnt->dyn = _dl_loaded_modules;
			app_tpnt->usage_count++;
			app_tpnt->symbol_scope = _dl_symbol_tables;
			lpnt = (unsigned long *) (app_tpnt->dynamic_info[DT_PLTGOT] + app_tpnt->loadaddr);
#ifdef ALLOW_ZERO_PLTGOT
			if (lpnt)
#endif
				INIT_GOT(lpnt, _dl_loaded_modules);
		}

		/* OK, fill this in - we did not have this before */
		if (ppnt->p_type == PT_INTERP) {
			int readsize = 0;
			char *pnt, *pnt1, buf[1024];
			tpnt->libname = _dl_strdup((char *) ppnt->p_offset +
					(auxvt[AT_PHDR].a_un.a_val & PAGE_ALIGN));

			/* Determine if the shared lib loader is a symlink */
			_dl_memset(buf, 0, sizeof(buf));
			readsize = _dl_readlink(tpnt->libname, buf, sizeof(buf));
			if (readsize > 0 && readsize < (int)(sizeof(buf)-1)) {
				pnt1 = _dl_strrchr(buf, '/');
				if (pnt1 && buf != pnt1) {
#ifdef __SUPPORT_LD_DEBUG_EARLY__
					_dl_dprintf(_dl_debug_file, "changing tpnt->libname from '%s' to '%s'\n", tpnt->libname, buf);
#endif
					tpnt->libname = _dl_strdup(buf);
				}
			}

			/* Store the path where the shared lib loader was found for
			 * later use */
			pnt = _dl_strdup(tpnt->libname);
			pnt1 = _dl_strrchr(pnt, '/');
			if (pnt != pnt1) {
				*pnt1 = '\0';
				_dl_ldsopath = pnt;
			} else {
				_dl_ldsopath = tpnt->libname;
			}
#ifdef __SUPPORT_LD_DEBUG_EARLY__
			_dl_dprintf(_dl_debug_file, "Lib Loader:\t(%x) %s\n", tpnt->loadaddr, tpnt->libname);
#endif
		}
	}


	/* Now we need to figure out what kind of options are selected.
	   Note that for SUID programs we ignore the settings in LD_LIBRARY_PATH */
	{
		if (_dl_getenv("LD_BIND_NOW", envp))
			be_lazy = 0;

		if ((auxvt[AT_UID].a_un.a_val == -1 && _dl_suid_ok()) ||
				(auxvt[AT_UID].a_un.a_val != -1 &&
				 auxvt[AT_UID].a_un.a_val == auxvt[AT_EUID].a_un.a_val
				 && auxvt[AT_GID].a_un.a_val== auxvt[AT_EGID].a_un.a_val)) {
			_dl_secure = 0;
			_dl_preload = _dl_getenv("LD_PRELOAD", envp);
			_dl_library_path = _dl_getenv("LD_LIBRARY_PATH", envp);
		} else {
			_dl_secure = 1;
			_dl_preload = _dl_getenv("LD_PRELOAD", envp);
			_dl_unsetenv("LD_AOUT_PRELOAD", envp);
			_dl_unsetenv("LD_LIBRARY_PATH", envp);
			_dl_unsetenv("LD_AOUT_LIBRARY_PATH", envp);
			_dl_library_path = NULL;
		}
	}

#ifdef __SUPPORT_LD_DEBUG__
	_dl_debug    = _dl_getenv("LD_DEBUG", envp);
	if (_dl_debug)
	{
		if (_dl_strstr(_dl_debug, "all")) {
			_dl_debug_detail = _dl_debug_move = _dl_debug_symbols
				= _dl_debug_reloc = _dl_debug_bindings = _dl_debug_nofixups = _dl_strstr(_dl_debug, "all");
		}
		else {
			_dl_debug_detail   = _dl_strstr(_dl_debug, "detail");
			_dl_debug_move     = _dl_strstr(_dl_debug, "move");
			_dl_debug_symbols  = _dl_strstr(_dl_debug, "sym");
			_dl_debug_reloc    = _dl_strstr(_dl_debug, "reloc");
			_dl_debug_nofixups = _dl_strstr(_dl_debug, "nofix");
			_dl_debug_bindings = _dl_strstr(_dl_debug, "bind");
		}
	}
	{
		const char *dl_debug_output;

		dl_debug_output = _dl_getenv("LD_DEBUG_OUTPUT", envp);

		if (dl_debug_output)
		{
			char tmp[22], *tmp1, *filename;
			int len1, len2;

			_dl_memset(tmp, 0, sizeof(tmp));
			tmp1=_dl_simple_ltoa( tmp, (unsigned long)_dl_getpid());

			len1 = _dl_strlen(dl_debug_output);
			len2 = _dl_strlen(tmp1);

			filename = _dl_malloc(len1+len2+2);

			if (filename)
			{
				_dl_strcpy (filename, dl_debug_output);
				filename[len1] = '.';
				_dl_strcpy (&filename[len1+1], tmp1);

				_dl_debug_file= _dl_open(filename, O_WRONLY|O_CREAT, 0644);
				if (_dl_debug_file<0)
				{
					_dl_debug_file = 2;
					_dl_dprintf (2, "can't open file: '%s'\n",filename);
				}
			}
		}
	}


#endif
	if (_dl_getenv("LD_TRACE_LOADED_OBJECTS", envp) != NULL) {
		trace_loaded_objects++;
	}
#ifndef __LDSO_LDD_SUPPORT__
	if (trace_loaded_objects) {
		_dl_dprintf(_dl_debug_file, "Use the ldd provided by uClibc\n");
		_dl_exit(1);
	}
#endif

	/*
	 * OK, fix one more thing - set up debug_addr so it will point
	 * to our chain.  Later we may need to fill in more fields, but this
	 * should be enough for now.
	 */
	debug_addr->r_map = (struct link_map *) _dl_loaded_modules;
	debug_addr->r_version = 1;
	debug_addr->r_ldbase = load_addr;
	debug_addr->r_brk = (unsigned long) &_dl_debug_state;
	_dl_debug_addr = debug_addr;

	/* Notify the debugger we are in a consistant state */
	_dl_debug_addr->r_state = RT_CONSISTENT;
	_dl_debug_state();

	/* OK, we now have the application in the list, and we have some
	   basic stuff in place.  Now search through the list for other shared
	   libraries that should be loaded, and insert them on the list in the
	   correct order. */

	_dl_map_cache();


	if (_dl_preload)
	{
		char c, *str, *str2;

		str = _dl_preload;
		while (*str == ':' || *str == ' ' || *str == '\t')
			str++;
		while (*str)
		{
			str2 = str;
			while (*str2 && *str2 != ':' && *str2 != ' ' && *str2 != '\t')
				str2++;
			c = *str2;
			*str2 = '\0';
			if (!_dl_secure || _dl_strchr(str, '/') == NULL)
			{
				if ((tpnt1 = _dl_check_if_named_library_is_loaded(str, trace_loaded_objects)))
				{
					continue;
				}
#if defined (__SUPPORT_LD_DEBUG__)
				if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s';  needed by '%s'\n",
						str, _dl_progname);
#endif
				tpnt1 = _dl_load_shared_library(_dl_secure, &rpnt, NULL, str, trace_loaded_objects);
				if (!tpnt1) {
#ifdef __LDSO_LDD_SUPPORT__
					if (trace_loaded_objects)
						_dl_dprintf(1, "\t%s => not found\n", str);
					else
#endif
					{
						_dl_dprintf(2, "%s: can't load " "library '%s'\n", _dl_progname, str);
						_dl_exit(15);
					}
				} else {
#ifdef __SUPPORT_LD_DEBUG_EARLY__
					_dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
#endif
#ifdef __LDSO_LDD_SUPPORT__
					if (trace_loaded_objects && tpnt1->usage_count==1) {
						/* this is a real hack to make ldd not print
						 * the library itself when run on a library. */
						if (_dl_strcmp(_dl_progname, str) != 0)
							_dl_dprintf(1, "\t%s => %s (%x)\n", str, tpnt1->libname,
									(unsigned) tpnt1->loadaddr);
					}
#endif
				}
			}
			*str2 = c;
			str = str2;
			while (*str == ':' || *str == ' ' || *str == '\t')
				str++;
		}
	}

#ifdef SUPPORT_LDSO_PRELOAD_FILE
	{
		int fd;
		struct stat st;
		char *preload;
		if (!_dl_stat(LDSO_PRELOAD, &st) && st.st_size > 0) {
			if ((fd = _dl_open(LDSO_PRELOAD, O_RDONLY, 0)) < 0) {
				_dl_dprintf(2, "%s: can't open file '%s'\n",
						_dl_progname, LDSO_PRELOAD);
			} else {
				preload = (caddr_t) _dl_mmap(0, st.st_size + 1,
						PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
				_dl_close(fd);
				if (preload == (caddr_t) - 1) {
					_dl_dprintf(2, "%s: can't map file '%s'\n",
							_dl_progname, LDSO_PRELOAD);
				} else {
					char c, *cp, *cp2;

					/* convert all separators and comments to spaces */
					for (cp = preload; *cp; /*nada */ ) {
						if (*cp == ':' || *cp == '\t' || *cp == '\n') {
							*cp++ = ' ';
						} else if (*cp == '#') {
							do
								*cp++ = ' ';
							while (*cp != '\n' && *cp != '\0');
						} else {
							cp++;
						}
					}

					/* find start of first library */
					for (cp = preload; *cp && *cp == ' '; cp++)
						/*nada */ ;

					while (*cp) {
						/* find end of library */
						for (cp2 = cp; *cp && *cp != ' '; cp++)
							/*nada */ ;
						c = *cp;
						*cp = '\0';

						if ((tpnt1 = _dl_check_if_named_library_is_loaded(cp2, trace_loaded_objects)))
						{
							continue;
						}
#if defined (__SUPPORT_LD_DEBUG__)
						if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s';  needed by '%s'\n",
								cp2, _dl_progname);
#endif
						tpnt1 = _dl_load_shared_library(0, &rpnt, NULL, cp2, trace_loaded_objects);
						if (!tpnt1) {
#ifdef __LDSO_LDD_SUPPORT__
							if (trace_loaded_objects)
								_dl_dprintf(1, "\t%s => not found\n", cp2);
							else
#endif
							{
								_dl_dprintf(2, "%s: can't load library '%s'\n", _dl_progname, cp2);
								_dl_exit(15);
							}
						} else {
#ifdef __SUPPORT_LD_DEBUG_EARLY__
							_dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
#endif
#ifdef __LDSO_LDD_SUPPORT__
							if (trace_loaded_objects && tpnt1->usage_count==1) {
								_dl_dprintf(1, "\t%s => %s (%x)\n", cp2,
										tpnt1->libname, (unsigned) tpnt1->loadaddr);
							}
#endif
						}

						/* find start of next library */
						*cp = c;
						for ( /*nada */ ; *cp && *cp == ' '; cp++)
							/*nada */ ;
					}

					_dl_munmap(preload, st.st_size + 1);
				}
			}
		}
	}
#endif

	for (tcurr = _dl_loaded_modules; tcurr; tcurr = tcurr->next)
	{
		Elf32_Dyn *dpnt;
		for (dpnt = (Elf32_Dyn *) tcurr->dynamic_addr; dpnt->d_tag; dpnt++)
		{
			if (dpnt->d_tag == DT_NEEDED)
			{
				char *name;
				lpntstr = (char*) (tcurr->loadaddr + tcurr->dynamic_info[DT_STRTAB] + dpnt->d_un.d_val);
				name = _dl_get_last_path_component(lpntstr);

				if ((tpnt1 = _dl_check_if_named_library_is_loaded(name, trace_loaded_objects)))
				{
					continue;
				}
#if defined (__SUPPORT_LD_DEBUG__)
				if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfile='%s';  needed by '%s'\n",
						lpntstr, _dl_progname);
#endif
				if (!(tpnt1 = _dl_load_shared_library(0, &rpnt, tcurr, lpntstr, trace_loaded_objects)))
				{
#ifdef __LDSO_LDD_SUPPORT__
					if (trace_loaded_objects) {
						_dl_dprintf(1, "\t%s => not found\n", lpntstr);
						continue;
					} else
#endif
					{
						_dl_dprintf(2, "%s: can't load library '%s'\n", _dl_progname, lpntstr);
						_dl_exit(16);
					}
				} else {
#ifdef __SUPPORT_LD_DEBUG_EARLY__
					_dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
#endif
#ifdef __LDSO_LDD_SUPPORT__
					if (trace_loaded_objects && tpnt1->usage_count==1) {
						_dl_dprintf(1, "\t%s => %s (%x)\n", lpntstr, tpnt1->libname,
								(unsigned) tpnt1->loadaddr);
					}
#endif
				}
			}
		}
	}


	_dl_unmap_cache();

	/*
	 * If the program interpreter is not in the module chain, add it.  This will
	 * be required for dlopen to be able to access the internal functions in the
	 * dynamic linker.
	 */
	if (tpnt) {
		tcurr = _dl_loaded_modules;
		if (tcurr)
			while (tcurr->next)
				tcurr = tcurr->next;
		tpnt->next = NULL;
		tpnt->usage_count++;

		if (tcurr) {
			tcurr->next = tpnt;
			tpnt->prev = tcurr;
		} else {
			_dl_loaded_modules = tpnt;
			tpnt->prev = NULL;
		}
		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;
		} else {
			rpnt = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
			_dl_memset(rpnt, 0, sizeof(struct dyn_elf));
		}
		rpnt->dyn = tpnt;
		tpnt = NULL;
	}

#ifdef __LDSO_LDD_SUPPORT__
	/* End of the line for ldd.... */
	if (trace_loaded_objects) {
		_dl_dprintf(1, "\t%s => %s (%x)\n", rpnt->dyn->libname + (_dl_strlen(_dl_ldsopath)) + 1,
				rpnt->dyn->libname, rpnt->dyn->loadaddr);
		_dl_exit(0);
	}
#endif


#ifdef __mips__
	/*
	 * Relocation of the GOT entries for MIPS have to be done
	 * after all the libraries have been loaded.
	 */
	_dl_perform_mips_global_got_relocations(_dl_loaded_modules);
#endif

#ifdef __SUPPORT_LD_DEBUG_EARLY__
	_dl_dprintf(_dl_debug_file, "Beginning relocation fixups\n");
#endif
	/*
	 * OK, now all of the kids are tucked into bed in their proper addresses.
	 * Now we go through and look for REL and RELA records that indicate fixups
	 * to the GOT tables.  We need to do this in reverse order so that COPY
	 * directives work correctly */
	if (_dl_symbol_tables)
		goof += _dl_fixup(_dl_symbol_tables, be_lazy);


	/* OK, at this point things are pretty much ready to run.  Now we
	   need to touch up a few items that are required, and then
	   we can let the user application have at it.  Note that
	   the dynamic linker itself is not guaranteed to be fully
	   dynamicly linked if we are using ld.so.1, so we have to look
	   up each symbol individually. */


	_dl_brkp = (unsigned long *) (intptr_t) _dl_find_hash("__curbrk", NULL, 0);

	if (_dl_brkp) {
		*_dl_brkp = brk_addr;
	}
	_dl_envp = (unsigned long *) (intptr_t) _dl_find_hash("__environ", NULL, 0);

	if (_dl_envp) {
		*_dl_envp = (unsigned long) envp;
	}

#ifndef FORCE_SHAREABLE_TEXT_SEGMENTS
	{
		unsigned int j;
		ElfW(Phdr) *myppnt;

		/* We had to set the protections of all pages to R/W for dynamic linking.
		   Set text pages back to R/O */
		for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
			for (myppnt = tpnt->ppnt, j = 0; j < tpnt->n_phent; j++, myppnt++) {
				if (myppnt->p_type == PT_LOAD && !(myppnt->p_flags & PF_W) && tpnt->dynamic_info[DT_TEXTREL]) {
					_dl_mprotect((void *) (tpnt->loadaddr + (myppnt->p_vaddr & PAGE_ALIGN)),
							(myppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) myppnt->p_filesz, LXFLAGS(myppnt->p_flags));
				}
			}
		}

	}
#endif
	_dl_atexit = (int (*)(void *)) (intptr_t) _dl_find_hash("atexit", NULL, ELF_RTYPE_CLASS_PLT);
#if defined (__SUPPORT_LD_DEBUG__)
	_dl_on_exit = (int (*)(void (*)(int, void *),void*))
		(intptr_t) _dl_find_hash("on_exit", NULL, ELF_RTYPE_CLASS_PLT);
#endif

	/* Notify the debugger we have added some objects. */
	_dl_debug_addr->r_state = RT_ADD;
	_dl_debug_state();

	for (rpnt = _dl_symbol_tables; rpnt!=NULL&& rpnt->next!=NULL; rpnt=rpnt->next)
		;

	for (;rpnt!=NULL; rpnt=rpnt->prev)
	{
		tpnt = rpnt->dyn;

		if (tpnt->libtype == program_interpreter)
			continue;

		/* Apparently crt0/1 for the application is responsible for handling this.
		 * We only need to run the init/fini for shared libraries
		 */
		if (tpnt->libtype == elf_executable)
			break;      /* at this point all shared libs are initialized !! */

		if (tpnt->init_flag & INIT_FUNCS_CALLED)
			continue;
		tpnt->init_flag |= INIT_FUNCS_CALLED;

		if (tpnt->dynamic_info[DT_INIT]) {
			void (*dl_elf_func) (void);
			dl_elf_func = (void (*)(void)) (intptr_t) (tpnt->loadaddr + tpnt->dynamic_info[DT_INIT]);
#if defined (__SUPPORT_LD_DEBUG__)
			if(_dl_debug) _dl_dprintf(_dl_debug_file,"\ncalling init: %s\n\n", tpnt->libname);
#endif
			(*dl_elf_func) ();
		}
		if (_dl_atexit && tpnt->dynamic_info[DT_FINI]) {
			void (*dl_elf_func) (void);
			dl_elf_func = (void (*)(void)) (intptr_t) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI]);
			(*_dl_atexit) (dl_elf_func);
#if defined (__SUPPORT_LD_DEBUG__)
			if(_dl_debug && _dl_on_exit)
			{
				(*_dl_on_exit)(debug_fini, tpnt->libname);
			}
#endif
		}
#if defined (__SUPPORT_LD_DEBUG__)
		else {
			if (!_dl_atexit)
				_dl_dprintf(_dl_debug_file, "%s: The address of atexit () is 0x0.\n", tpnt->libname);
#if 0
			if (!tpnt->dynamic_info[DT_FINI])
				_dl_dprintf(_dl_debug_file, "%s: Invalid .fini section.\n", tpnt->libname);
#endif
		}
#endif
	}

	/* Notify the debugger that all objects are now mapped in.  */
	_dl_debug_addr->r_state = RT_CONSISTENT;
	_dl_debug_state();
}

char *_dl_getenv(const char *symbol, char **envp)
{
	char *pnt;
	const char *pnt1;

	while ((pnt = *envp++)) {
		pnt1 = symbol;
		while (*pnt && *pnt == *pnt1)
			pnt1++, pnt++;
		if (!*pnt || *pnt != '=' || *pnt1)
			continue;
		return pnt + 1;
	}
	return 0;
}

void _dl_unsetenv(const char *symbol, char **envp)
{
	char *pnt;
	const char *pnt1;
	char **newenvp = envp;

	for (pnt = *envp; pnt; pnt = *++envp) {
		pnt1 = symbol;
		while (*pnt && *pnt == *pnt1)
			pnt1++, pnt++;
		if (!*pnt || *pnt != '=' || *pnt1)
			*newenvp++ = *envp;
	}
	*newenvp++ = *envp;
	return;
}

static int _dl_suid_ok(void)
{
	__kernel_uid_t uid, euid;
	__kernel_gid_t gid, egid;

	uid = _dl_getuid();
	euid = _dl_geteuid();
	gid = _dl_getgid();
	egid = _dl_getegid();

	if(uid == euid && gid == egid) {
		return 1;
	}
	return 0;
}

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 > _dl_pagesize) {
#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, -1, 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 = (unsigned char *) (((unsigned long) _dl_malloc_addr + 3) & ~(3));
	return retval;
}


#include "dl-hash.c"
#include "dl-elf.c"