Remove old named file. Fix headers on updated one.

ldso/ldso/boot1.c

@@ -1,1214 +0,0 @@
-/* Run an ELF binary on a linux system.
-
-   Copyright (C) 1993-1996, Eric Youngdale.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-
-
-/* Program to load an ELF binary on a linux system, and run it.
- * References to symbols in sharable libraries can be resolved by
- * an ELF sharable library. */
-
-/* Disclaimer:  I have never seen any AT&T source code for SVr4, nor have
-   I ever taken any courses on internals.  This program was developed using
-   information available through the book "UNIX SYSTEM V RELEASE 4,
-   Programmers guide: Ansi C and Programming Support Tools", which did
-   a more than adequate job of explaining everything required to get this
-   working. */
-
-/*
- * The main trick with this program is that initially, we ourselves are not
- * dynamicly linked.  This means that we cannot access any global variables
- * since the GOT is initialized by the linker assuming a virtual address of 0,
- * and we cannot call any functions since the PLT is not initialized at all
- * (it will tend to want to call the dynamic linker
- *
- * There are further restrictions - we cannot use large switch statements,
- * since the compiler generates tables of addresses and jumps through them.
- * We can use inline functions, because these do not transfer control to
- * a new address, but they must be static so that they are not exported
- * from the modules.  We cannot use normal syscall stubs, because these
- * all reference the errno global variable which is not yet initialized.
- * We can use all of the local stack variables that we want, since these
- * are all referenced to %ebp or %esp.
- *
- * Life is further complicated by the fact that initially we do not want
- * to do a complete dynamic linking.  We want to allow the user to supply
- * new functions replacing some of the library versions, and until we have
- * the list of modules that we should search set up, we do not want to do
- * any of this.  Thus I have chosen to only perform the relocations for
- * variables that start with "_dl_" since ANSI specifies that the user is
- * not supposed to redefine any of these variables.
- *
- * Fortunately, the linker itself leaves a few clues lying around, and
- * when the kernel starts the image, there are a few further clues.
- * First of all, there is information buried on the stack that the kernel
- * leaves, which includes information about the load address that the
- * program interpreter was loaded at, the number of sections, the address
- * the application was loaded at and so forth.  Here this information
- * is stored in the array dl_info, and the indicies are taken from the
- * file /usr/include/sys/auxv.h on any SVr4 system.
- *
- * The linker itself leaves a pointer to the .dynamic section in the first
- * slot of the GOT, and as it turns out, %ebx points to ghe GOT when
- * you are using PIC code, so we just dereference this to get the address
- * of the dynamic sections.
- *
- * Typically you must load all text pages as writable so that dynamic linking
- * can succeed.  The kernel under SVr4 loads these as R/O, so we must call
- * mprotect to change the protections.  Once we are done, we should set these
- * back again, so the desired behavior is achieved.  Under linux there is
- * currently no mprotect function in the distribution kernel (although
- * someone has alpha patches), so for now everything is loaded writable.
- *
- * We do not have access to malloc and friends at the initial stages of dynamic
- * linking, and it would be handy to have some scratchpad memory available for
- * use as we set things up.  We mmap one page of scratch space, and have a
- * simple _dl_malloc that uses this memory.  This is a good thing, since we do
- * not want to use the same memory pool as malloc anyway - esp if the user
- * redefines malloc to do something funky.
- *
- * Our first task is to perform a minimal linking so that we can call other
- * portions of the dynamic linker.  Once we have done this, we then build
- * the list of modules that the application requires, using LD_LIBRARY_PATH
- * if this is not a suid program (/usr/lib otherwise).  Once this is done,
- * we can do the dynamic linking as required (and we must omit the things
- * we did to get the dynamic linker up and running in the first place.
- * After we have done this, we just have a few housekeeping chores and we
- * can transfer control to the user's application.
- */
-
-#include <stdarg.h>
-#include "sysdep.h" /* before elf.h to get ELF_USES_RELOCA right */
-#include <elf.h>
-#include "linuxelf.h"
-#include "hash.h"
-#include "syscall.h"
-#include "string.h"
-#include "../config.h"
-
-#define ALLOW_ZERO_PLTGOT
-
-/*  Some arches may need to override this in boot1_arch.h */
-#define	    ELFMAGIC	ELFMAG
-
-/* This is a poor man's malloc, used prior to resolving our internal poor man's malloc */
-#define DL_MALLOC(SIZE) ((void *) (malloc_buffer += SIZE, malloc_buffer - SIZE)) ;  REALIGN();
-/*
- * Make sure that the malloc buffer is aligned on 4 byte boundary.  For 64 bit
- * platforms we may need to increase this to 8, but this is good enough for
- * now.  This is typically called after DL_MALLOC.
- */
-#define REALIGN() malloc_buffer = (char *) (((unsigned long) malloc_buffer + 3) & ~(3))
-
-static char *_dl_malloc_addr, *_dl_mmap_zero;
-char *_dl_library_path = 0;		/* Where we look for libraries */
-char *_dl_preload = 0;			/* Things to be loaded before the libs. */
-#include "ld.so.h"			/* Pull in the name of ld.so */
-const char *_dl_progname=_dl_static_progname;
-static char *_dl_not_lazy = 0;
-#ifdef DL_TRACE
-static char *_dl_trace_loaded_objects = 0;
-#endif
-static int (*_dl_elf_main) (int, char **, char **);
-static int (*_dl_elf_init) (void);
-void *(*_dl_malloc_function) (int size) = NULL;
-struct r_debug *_dl_debug_addr = NULL;
-unsigned long *_dl_brkp;
-unsigned long *_dl_envp;
-char *_dl_getenv(char *symbol, char **envp);
-void _dl_unsetenv(char *symbol, char **envp);
-int _dl_fixup(struct elf_resolve *tpnt);
-void _dl_debug_state(void);
-char *_dl_get_last_path_component(char *path);
-
-#include "boot1_arch.h"
-
-
-/* When we enter this piece of code, the program stack looks like this:
-        argc            argument counter (integer)
-        argv[0]         program name (pointer)
-        argv[1...N]     program args (pointers)
-        argv[argc-1]    end of args (integer)
-	NULL
-        env[0...N]      environment variables (pointers)
-        NULL
-	auxv_t[0...N]   Auxiliary Vector Table elements (mixed types)
-*/
-
-#ifdef DL_DEBUG
-/* Debugging is especially tricky on PowerPC, since string literals
- * require relocations.  Thus, you can't use _dl_dprintf() for
- * anything until the bootstrap relocations are finished. */
-static inline void hexprint(unsigned long x)
-{
-	int i;
-	char c;
-	for(i=0;i<8;i++){
-		c=((x>>28)+'0');
-		if(c>'9')c+='a'-'9'-1;
-		_dl_write(1,&c,1);
-		x<<=4;
-	}
-	c='\n';
-	_dl_write(1,&c,1);
-}
-#endif
-
-DL_BOOT(unsigned long args)
-{
-	unsigned int argc;
-	char **argv, **envp;
-	unsigned long load_addr;
-	unsigned long *got;
-	unsigned long *aux_dat;
-	int goof = 0;
-	elfhdr *header;
-	struct elf_resolve *tpnt;
-	struct dyn_elf *rpnt;
-	struct elf_resolve *app_tpnt;
-	unsigned long brk_addr;
-	Elf32_auxv_t auxv_t[AT_EGID + 1];
-	unsigned char *malloc_buffer, *mmap_zero;
-	int (*_dl_atexit) (void *);
-	unsigned long *lpnt;
-	Elf32_Dyn *dpnt;
-	unsigned long *hash_addr;
-	struct r_debug *debug_addr;
-	unsigned long *chains;
-	int indx;
-	int _dl_secure;
-	int status;
-
-
-	/* WARNING! -- we cannot make _any_ funtion calls until we have
-	 * taken care of fixing up our own relocations.  Making static
-	 * lnline calls is ok, but _no_ function calls.  Not yet
-	 * anyways. */
-
-	/* First obtain the information on the stack that tells us more about
-	   what binary is loaded, where it is loaded, etc, etc */
-	GET_ARGV(aux_dat,args);
-#if defined(__arm__)
-	aux_dat+=1;
-#endif	
-	argc = *(aux_dat - 1);
-        argv = (char **) aux_dat;
-	aux_dat += argc;			/* Skip over the argv pointers */
-	aux_dat++;				/* Skip over NULL at end of argv */
-	envp = (char **) aux_dat;
-	while (*aux_dat)
-		aux_dat++;			/* Skip over the envp pointers */
-	aux_dat++;				/* Skip over NULL at end of envp */
-
-	/* Place -1 here as a checkpoint.  We later check if it was changed
-	 * when we read in the auxv_t */
-	auxv_t[AT_UID].a_type = -1;
-	
-	/* The junk on the stack immediately following the environment is  
-	 * the Auxiliary Vector Table.  Read out the elements of the auxv_t,
-	 * sort and store them in auxv_t for later use. */
-	while (*aux_dat) 
-	{
-		Elf32_auxv_t *auxv_entry = (Elf32_auxv_t*) aux_dat;
-
-		if (auxv_entry->a_type <= AT_EGID) {
-			_dl_memcpy(&(auxv_t[auxv_entry->a_type]), 
-				auxv_entry, sizeof(Elf32_auxv_t));
-		}
-		aux_dat += 2;
-	}
-	
-	/* locate the ELF header.   We need this done as soon as possible 
-	 * (esp since SEND_STDERR() needs this on some platforms... */
-	load_addr = auxv_t[AT_BASE].a_un.a_val;
-	header = (elfhdr *) auxv_t[AT_BASE].a_un.a_ptr;
-
-	/* Check the ELF header to make sure everything looks ok.  */
-	if (! header || header->e_ident[EI_CLASS] != ELFCLASS32 ||
-		header->e_ident[EI_VERSION] != EV_CURRENT
-#ifndef __powerpc__
-		|| _dl_strncmp((void *)header, ELFMAGIC, SELFMAG) != 0
-#endif
-		)
-	{
-	    SEND_STDERR("Invalid ELF header\n");
-	    _dl_exit(0);
-	}
-#ifdef DL_DEBUG
-	SEND_STDERR("ELF header =");
-	SEND_ADDRESS_STDERR(load_addr, 1);
-#endif	
-
-
-	/* Locate the global offset table.  Since this code must be PIC  
-	 * we can take advantage of the magic offset register, if we
-	 * happen to know what that is for this architecture.  If not,
-	 * we can always read stuff out of the ELF file to find it... */
-#if defined(__i386__)
-	__asm__("\tmovl %%ebx,%0\n\t" : "=a" (got));
-#elif defined(__m68k__)
-	__asm__ ("movel %%a5,%0" : "=g" (got))
-#elif defined(__sparc__)
-	__asm__("\tmov %%l7,%0\n\t" : "=r" (got))
-#elif defined(__arm__)
-	__asm__("\tmov %0, r10\n\t" : "=r"(got));
-#elif defined(__powerpc__)
-	__asm__("\tbl _GLOBAL_OFFSET_TABLE_-4@local\n\t" : "=l"(got));
-#else
-	/* Do things the slow way in C */
-	{
-	    unsigned long tx_reloc;
-	    Elf32_Dyn *dynamic=NULL;
-	    Elf32_Shdr *shdr;
-	    Elf32_Phdr *pt_load;
-
-#ifdef DL_DEBUG
-	    SEND_STDERR("Finding the got using C code to read the ELF file\n");
-#endif	
-	    /* Find where the dynamic linking information section is hiding */
-	    shdr = (Elf32_Shdr *)(header->e_shoff + (char *)header);
-	    for (indx = header->e_shnum; --indx>=0; ++shdr) {
-		if (shdr->sh_type == SHT_DYNAMIC) {
-		    goto found_dynamic;
-		}
-	    }
-	    SEND_STDERR("missing dynamic linking information section \n");
-	    _dl_exit(0);
-
-found_dynamic:
-	    dynamic = (Elf32_Dyn*)(shdr->sh_offset + (char *)header);
-
-	    /* Find where PT_LOAD is hiding */
-	    pt_load = (Elf32_Phdr *)(header->e_phoff + (char *)header);
-	    for (indx = header->e_phnum; --indx>=0; ++pt_load) {
-		if (pt_load->p_type == PT_LOAD) {
-		    goto found_pt_load;
-		}
-	    }
-	    SEND_STDERR("missing loadable program segment\n");
-	    _dl_exit(0);
-
-found_pt_load:
-	    /* Now (finally) find where DT_PLTGOT is hiding */
-	    tx_reloc = pt_load->p_vaddr - pt_load->p_offset;
-	    for (; DT_NULL!=dynamic->d_tag; ++dynamic) {
-		if (dynamic->d_tag == DT_PLTGOT) {
-		    goto found_got;
-		}       
-	    }       
-	    SEND_STDERR("missing global offset table\n");
-	    _dl_exit(0);
-
-found_got:
-	    got = (unsigned long *)(dynamic->d_un.d_val - tx_reloc + (char *)header );
-	}
-#endif
-
-	/* Now, finally, fix up the location of the dynamic stuff */
-	dpnt = (Elf32_Dyn *) (*got + load_addr);
-#ifdef DL_DEBUG
-	SEND_STDERR("First Dynamic section entry=");
-	SEND_ADDRESS_STDERR(dpnt, 1);
-#endif	
-
-	
-	/* Call mmap to get a page of writable memory that can be used 
-	 * for _dl_malloc throughout the shared lib loader. */
-	mmap_zero = malloc_buffer = _dl_mmap((void *) 0, 4096, 
-		PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
-	if (_dl_mmap_check_error(mmap_zero)) {
-	    SEND_STDERR("dl_boot: mmap of a spare page failed!\n");
-	    _dl_exit(13);
-	}
-
-	tpnt = DL_MALLOC(sizeof(struct elf_resolve));
-	_dl_memset(tpnt, 0, sizeof(*tpnt));
-	app_tpnt = DL_MALLOC(sizeof(struct elf_resolve));
-	_dl_memset(app_tpnt, 0, sizeof(*app_tpnt));
-
-	/*
-	 * This is used by gdb to locate the chain of shared libraries that are currently loaded.
-	 */
-	debug_addr = DL_MALLOC(sizeof(struct r_debug));
-	_dl_memset(debug_addr, 0, sizeof(*debug_addr));
-
-	/* OK, that was easy.  Next scan the DYNAMIC section of the image.
-	   We are only doing ourself right now - we will have to do the rest later */
-
-	while (dpnt->d_tag) {
-		if(dpnt->d_tag<24) {
-			tpnt->dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
-			if (dpnt->d_tag == DT_TEXTREL || SVR4_BUGCOMPAT) {
-				tpnt->dynamic_info[DT_TEXTREL] = 1;
-			}
-		}
-		dpnt++;
-	}
-
-	{
-		elf_phdr *ppnt;
-		int i;
-
-		ppnt = (elf_phdr *) auxv_t[AT_PHDR].a_un.a_ptr;
-		for (i = 0; i < auxv_t[AT_PHNUM].a_un.a_val; i++, ppnt++)
-			if (ppnt->p_type == PT_DYNAMIC) {
-				dpnt = (Elf32_Dyn *) ppnt->p_vaddr;
-				while (dpnt->d_tag) {
-					if (dpnt->d_tag > DT_JMPREL) {
-						dpnt++;
-						continue;
-					}
-					app_tpnt->dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
-					if (dpnt->d_tag == DT_DEBUG)
-						dpnt->d_un.d_val = (unsigned long) debug_addr;
-					if (dpnt->d_tag == DT_TEXTREL || SVR4_BUGCOMPAT)
-						app_tpnt->dynamic_info[DT_TEXTREL] = 1;
-					dpnt++;
-				}
-			}
-	}
-
-	/* Get some more of the information that we will need to dynamicly link
-	   this module to itself */
-
-	hash_addr = (unsigned long *) (tpnt->dynamic_info[DT_HASH] + load_addr);
-	tpnt->nbucket = *hash_addr++;
-	tpnt->nchain = *hash_addr++;
-	tpnt->elf_buckets = hash_addr;
-	hash_addr += tpnt->nbucket;
-	chains = hash_addr;
-
-	/* Ugly, ugly.  We need to call mprotect to change the protection of
-	   the text pages so that we can do the dynamic linking.  We can set the
-	   protection back again once we are done */
-
-	{
-		elf_phdr *ppnt;
-		int i;
-
-		/* First cover the shared library/dynamic linker. */
-		if (tpnt->dynamic_info[DT_TEXTREL]) {
-			header = (elfhdr *) auxv_t[AT_BASE].a_un.a_ptr;
-			ppnt = (elf_phdr *) (auxv_t[AT_BASE].a_un.a_ptr + header->e_phoff);
-			for (i = 0; i < header->e_phnum; i++, ppnt++) {
-				if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
-					_dl_mprotect((void *) (load_addr + (ppnt->p_vaddr & 0xfffff000)), 
-						(ppnt->p_vaddr & 0xfff) + (unsigned long) ppnt->p_filesz, 
-						PROT_READ | PROT_WRITE | PROT_EXEC);
-			}
-		}
-
-		/* Now cover the application program. */
-		if (app_tpnt->dynamic_info[DT_TEXTREL]) {
-			ppnt = (elf_phdr *) auxv_t[AT_PHDR].a_un.a_ptr;
-			for (i = 0; i < auxv_t[AT_PHNUM].a_un.a_val; i++, ppnt++) {
-				if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
-					_dl_mprotect((void *) (ppnt->p_vaddr & 0xfffff000), 
-						(ppnt->p_vaddr & 0xfff) + 
-						(unsigned long) ppnt->p_filesz, 
-						PROT_READ | PROT_WRITE | PROT_EXEC);
-			}
-		}
-	}
-
-	/* OK, now do the relocations.  We do not do a lazy binding here, so
-	   that once we are done, we have considerably more flexibility. */
-
-	goof = 0;
-	for (indx = 0; indx < 2; indx++) {
-		int i;
-		ELF_RELOC *rpnt;
-		unsigned long *reloc_addr;
-		unsigned long symbol_addr;
-		int symtab_index;
-		unsigned long rel_addr, rel_size;
-
-
-#ifdef ELF_USES_RELOCA
-		rel_addr =
-			(indx ? tpnt->dynamic_info[DT_JMPREL] : tpnt->
-			 dynamic_info[DT_RELA]);
-		rel_size =
-			(indx ? tpnt->dynamic_info[DT_PLTRELSZ] : tpnt->
-			 dynamic_info[DT_RELASZ]);
-#else
-		rel_addr =
-			(indx ? tpnt->dynamic_info[DT_JMPREL] : tpnt->
-			 dynamic_info[DT_REL]);
-		rel_size =
-			(indx ? tpnt->dynamic_info[DT_PLTRELSZ] : tpnt->
-			 dynamic_info[DT_RELSZ]);
-#endif
-
-
-		if (!rel_addr)
-			continue;
-
-		/* Now parse the relocation information */
-		rpnt = (ELF_RELOC *) (rel_addr + load_addr);
-		for (i = 0; i < rel_size; i += sizeof(ELF_RELOC), rpnt++) {
-			reloc_addr = (unsigned long *) (load_addr + (unsigned long) rpnt->r_offset);
-			symtab_index = ELF32_R_SYM(rpnt->r_info);
-			symbol_addr = 0;
-			if (symtab_index) {
-				char *strtab;
-				Elf32_Sym *symtab;
-
-				symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + load_addr);
-				strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + load_addr);
-
-				/* We only do a partial dynamic linking right now.  The user
-				   is not supposed to redefine any symbols that start with
-				   a '_', so we can do this with confidence. */
-
-				if (!_dl_symbol(strtab + symtab[symtab_index].st_name))
-					continue;
-
-				symbol_addr = load_addr + symtab[symtab_index].st_value;
-
-				if (!symbol_addr) {
-					/*
-					 * This will segfault - you cannot call a function until
-					 * we have finished the relocations.
-					 */
-					SEND_STDERR("ELF dynamic loader - unable to "
-						"self-bootstrap - symbol ");
-					SEND_STDERR(strtab + symtab[symtab_index].st_name);
-					SEND_STDERR(" undefined.\n");
-					goof++;
-				}
-			}
-			/*
-			 * Use this machine-specific macro to perform the actual relocation.
-			 */
-			PERFORM_BOOTSTRAP_RELOC(rpnt, reloc_addr, symbol_addr, load_addr);
-		}
-	}
-
-	if (goof) {
-		_dl_exit(14);
-	}
-
-	/* OK, at this point we have a crude malloc capability.  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. */
-	_dl_malloc_addr = malloc_buffer;
-	_dl_mmap_zero = mmap_zero;
-
-	/* 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. */
-	lpnt = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + load_addr);
-	INIT_GOT(lpnt, tpnt);
-
-	/* OK, this was a big step, now we need to scan all of the user images
-	   and load them properly. */
-
-	tpnt->next = 0;
-	tpnt->libname = 0;
-	tpnt->libtype = program_interpreter;
-
-	{
-		elfhdr *epnt;
-		elf_phdr *ppnt;
-		int i;
-
-		epnt = (elfhdr *) auxv_t[AT_BASE].a_un.a_ptr;
-		tpnt->n_phent = epnt->e_phnum;
-		tpnt->ppnt = ppnt = (elf_phdr *) (load_addr + epnt->e_phoff);
-		for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
-			if (ppnt->p_type == PT_DYNAMIC) {
-				tpnt->dynamic_addr = ppnt->p_vaddr + load_addr;
-				tpnt->dynamic_size = ppnt->p_filesz;
-			}
-		}
-	}
-
-	tpnt->chains = chains;
-	tpnt->loadaddr = (char *) load_addr;
-
-	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 */
-
-	{
-		elf_phdr *ppnt;
-		int i;
-
-		ppnt = (elf_phdr *) auxv_t[AT_PHDR].a_un.a_ptr;
-		for (i = 0; i < auxv_t[AT_PHNUM].a_un.a_val; i++, ppnt++) {
-			if (ppnt->p_type == PT_LOAD) {
-				if (ppnt->p_vaddr + ppnt->p_memsz > brk_addr)
-					brk_addr = ppnt->p_vaddr + 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("", 0, 
-					app_tpnt->dynamic_info, ppnt->p_vaddr, ppnt->p_filesz);
-				_dl_loaded_modules->libtype = elf_executable;
-				_dl_loaded_modules->ppnt = (elf_phdr *) auxv_t[AT_PHDR].a_un.a_ptr;
-				_dl_loaded_modules->n_phent = auxv_t[AT_PHNUM].a_un.a_val;
-				_dl_symbol_tables = rpnt = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
-				_dl_memset(rpnt, 0, sizeof(*rpnt));
-				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]);
-#ifdef ALLOW_ZERO_PLTGOT
-				if (lpnt)
-#endif
-					INIT_GOT(lpnt, _dl_loaded_modules);
-			}
-			if (ppnt->p_type == PT_INTERP) {	/* OK, fill this in - we did not 
-								   have this before */
-				tpnt->libname = _dl_strdup((char *) ppnt->p_offset +
-							   (auxv_t[AT_PHDR].a_un.a_val & 0xfffff000));
-			}
-		}
-	}
-
-	if (argv[0]) {
-		_dl_progname = argv[0];
-	}
-
-	/* 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 */
-	{
-		_dl_not_lazy = _dl_getenv("LD_BIND_NOW", envp);
-
-		if ((auxv_t[AT_UID].a_un.a_val == -1 && _dl_suid_ok()) ||
-			(auxv_t[AT_UID].a_un.a_val != -1 && 
-			 auxv_t[AT_UID].a_un.a_val == auxv_t[AT_EUID].a_un.a_val
-			 && auxv_t[AT_GID].a_un.a_val== auxv_t[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 DL_TRACE
-	_dl_trace_loaded_objects = _dl_getenv("LD_TRACE_LOADED_OBJECTS", envp);
-#endif
-	/* 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. */
-
-#ifdef USE_CACHE
-	_dl_map_cache();
-#endif
-
-	{
-		struct elf_resolve *tcurr;
-		struct elf_resolve *tpnt1;
-		char *lpnt;
-
-		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) 
-				{
-					tpnt1 = _dl_load_shared_library(_dl_secure, NULL, str);
-					if (!tpnt1) {
-#ifdef DL_TRACE
-						if (_dl_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);
-#ifdef DL_TRACE
-						}
-#endif
-					} else {
-#ifdef DL_TRACE
-						if (_dl_trace_loaded_objects
-							&& !tpnt1->usage_count) {
-							/* 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 (0x%x)\n", str, tpnt1->libname, 
-									(unsigned) tpnt1->loadaddr);
-						}
-#endif
-						rpnt->next = (struct dyn_elf *)
-							_dl_malloc(sizeof(struct dyn_elf));
-						_dl_memset(rpnt->next, 0, sizeof(*(rpnt->next)));
-						rpnt = rpnt->next;
-						tpnt1->usage_count++;
-						tpnt1->symbol_scope = _dl_symbol_tables;
-						tpnt1->libtype = elf_lib;
-						rpnt->dyn = tpnt1;
-					}
-				}
-				*str2 = c;
-				str = str2;
-				while (*str == ':' || *str == ' ' || *str == '\t')
-					str++;
-			}
-		}
-
-		{
-			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) {
-					_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';
-
-							tpnt1 = _dl_load_shared_library(0, NULL, cp2);
-							if (!tpnt1) {
-#ifdef DL_TRACE
-								if (_dl_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);
-#ifdef DL_TRACE
-						}
-#endif
-							} else {
-#ifdef DL_TRACE
-								if (_dl_trace_loaded_objects
-									&& !tpnt1->usage_count) {
-									_dl_dprintf(1, "\t%s => %s (0x%x)\n", cp2, 
-										tpnt1->libname, (unsigned) tpnt1->loadaddr);
-								}
-#endif
-								rpnt->next = (struct dyn_elf *)
-									_dl_malloc(sizeof(struct dyn_elf));
-								_dl_memset(rpnt->next, 0, 
-									sizeof(*(rpnt->next)));
-								rpnt = rpnt->next;
-								tpnt1->usage_count++;
-								tpnt1->symbol_scope = _dl_symbol_tables;
-								tpnt1->libtype = elf_lib;
-								rpnt->dyn = tpnt1;
-							}
-
-							/* find start of next library */
-							*cp = c;
-							for ( /*nada */ ; *cp && *cp == ' '; cp++)
-								/*nada */ ;
-						}
-
-						_dl_munmap(preload, st.st_size + 1);
-					}
-				}
-			}
-		}
-
-		for (tcurr = _dl_loaded_modules; tcurr; tcurr = tcurr->next) {
-			for (dpnt = (Elf32_Dyn *) tcurr->dynamic_addr; dpnt->d_tag;
-				 dpnt++) {
-				if (dpnt->d_tag == DT_NEEDED) {
-					lpnt = tcurr->loadaddr + tcurr->dynamic_info[DT_STRTAB] +
-						dpnt->d_un.d_val;
-					if (tpnt && _dl_strcmp(lpnt, 
-						    _dl_get_last_path_component(tpnt->libname)) == 0) {
-						struct elf_resolve *ttmp;
-
-#ifdef DL_TRACE
-						if (_dl_trace_loaded_objects && !tpnt->usage_count) {
-						    _dl_dprintf(1, "\t%s => %s (0x%x)\n", 
-							    lpnt, tpnt->libname, (unsigned) tpnt->loadaddr);
-						}
-#endif
-						ttmp = _dl_loaded_modules;
-						while (ttmp->next)
-							ttmp = ttmp->next;
-						ttmp->next = tpnt;
-						tpnt->prev = ttmp;
-						tpnt->next = NULL;
-						rpnt->next = (struct dyn_elf *)
-							_dl_malloc(sizeof(struct dyn_elf));
-						_dl_memset(rpnt->next, 0, sizeof(*(rpnt->next)));
-						rpnt = rpnt->next;
-						rpnt->dyn = tpnt;
-						tpnt->usage_count++;
-						tpnt->symbol_scope = _dl_symbol_tables;
-						tpnt = NULL;
-						continue;
-					}
-					if (!(tpnt1 = _dl_load_shared_library(0, tcurr, lpnt))) {
-#ifdef DL_TRACE
-						if (_dl_trace_loaded_objects)
-							_dl_dprintf(1, "\t%s => not found\n", lpnt);
-						else {
-#endif
-							_dl_dprintf(2, "%s: can't load library '%s'\n", 
-								_dl_progname, lpnt);
-							_dl_exit(16);
-#ifdef DL_TRACE
-						}
-#endif
-					} else {
-#ifdef DL_TRACE
-						if (_dl_trace_loaded_objects && !tpnt1->usage_count)
-							_dl_dprintf(1, "\t%s => %s (0x%x)\n", lpnt, tpnt1->libname, 
-								(unsigned) tpnt1->loadaddr);
-#endif
-						rpnt->next = (struct dyn_elf *)
-							_dl_malloc(sizeof(struct dyn_elf));
-						_dl_memset(rpnt->next, 0, sizeof(*(rpnt->next)));
-						rpnt = rpnt->next;
-						tpnt1->usage_count++;
-						tpnt1->symbol_scope = _dl_symbol_tables;
-						tpnt1->libtype = elf_lib;
-						rpnt->dyn = tpnt1;
-					}
-				}
-			}
-		}
-	}
-
-#ifdef USE_CACHE
-	_dl_unmap_cache();
-#endif
-	/* ldd uses uses this.  I am not sure how you pick up the other flags */
-#ifdef DL_TRACE
-	if (_dl_trace_loaded_objects) {
-		char *_dl_warn = 0;
-		_dl_warn = _dl_getenv("LD_WARN", envp);
-		if (!_dl_warn)
-			_dl_exit(0);
-	}
-#endif
-
-	/*
-	 * 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) {
-		struct elf_resolve *tcurr;
-
-		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(*(rpnt->next)));
-			rpnt = rpnt->next;
-		} else {
-			rpnt = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
-			_dl_memset(rpnt, 0, sizeof(*(rpnt->next)));
-		}
-		rpnt->dyn = tpnt;
-		tpnt = NULL;
-	}
-
-	/*
-	 * 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 */
-	goof = _dl_loaded_modules ? _dl_fixup(_dl_loaded_modules) : 0;
-
-
-	/* Some flavors of SVr4 do not generate the R_*_COPY directive,
-	   and we have to manually search for entries that require fixups. 
-	   Solaris gets this one right, from what I understand.  */
-
-	if (_dl_symbol_tables)
-		goof += _dl_copy_fixups(_dl_symbol_tables);
-#ifdef DL_TRACE
-	if (goof || _dl_trace_loaded_objects)
-		_dl_exit(0);
-#endif
-
-	/* 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 *) _dl_find_hash("___brk_addr", NULL, 1, NULL, 0);
-	if (_dl_brkp)
-		*_dl_brkp = brk_addr;
-	_dl_envp =
-		(unsigned long *) _dl_find_hash("__environ", NULL, 1, NULL, 0);
-
-	if (_dl_envp)
-		*_dl_envp = (unsigned long) envp;
-	{
-		int i;
-		elf_phdr *ppnt;
-
-		/* 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 (ppnt = tpnt->ppnt, i = 0; i < tpnt->n_phent; i++, ppnt++)
-				if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W) &&
-					tpnt->dynamic_info[DT_TEXTREL])
-					_dl_mprotect((void *) (tpnt->loadaddr + (ppnt->p_vaddr & 0xfffff000)), 
-						(ppnt->p_vaddr & 0xfff) + (unsigned long) ppnt->p_filesz, 
-						LXFLAGS(ppnt->p_flags));
-
-	}
-
-	_dl_atexit = (int (*)(void *)) _dl_find_hash("atexit", NULL, 1, NULL, 0);
-
-	/*
-	 * OK, fix one more thing - set up the debug_addr structure to 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;
-	debug_addr->r_state = RT_CONSISTENT;
-	/* This is written in this funny way to keep gcc from inlining the
-	   function call. */
-	((void (*)(void)) debug_addr->r_brk) ();
-
-	for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
-		/* Apparently crt1 for the application is responsible for handling this.
-		 * We only need to run the init/fini for shared libraries
-		 */
-		if (tpnt->libtype == program_interpreter ||
-			tpnt->libtype == elf_executable)
-			continue;
-		if (tpnt->init_flag & INIT_FUNCS_CALLED)
-			continue;
-		tpnt->init_flag |= INIT_FUNCS_CALLED;
-
-		if (tpnt->dynamic_info[DT_INIT]) {
-			_dl_elf_init = (int (*)(void)) (tpnt->loadaddr + 
-				tpnt->dynamic_info[DT_INIT]);
-			(*_dl_elf_init) ();
-		}
-		if (_dl_atexit && tpnt->dynamic_info[DT_FINI]) {
-			(*_dl_atexit) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI]);
-		}
-#undef DL_DEBUG
-#ifdef DL_DEBUG
-		else {
-			_dl_dprintf(2, tpnt->libname);
-			_dl_dprintf(2, ": ");
-			if (!_dl_atexit)
-				_dl_dprintf(2, "The address is atexit () is 0x0.");
-			if (!tpnt->dynamic_info[DT_FINI])
-				_dl_dprintf(2, "Invalid .fini section.");
-			_dl_dprintf(2, "\n");
-		}
-#endif
-#undef DL_DEBUG
-	}
-
-	/* OK we are done here.  Turn out the lights, and lock up. */
-	_dl_elf_main = (int (*)(int, char **, char **)) auxv_t[AT_ENTRY].a_un.a_fcn;
-
-
-	/*
-	 * Transfer control to the application.
-	 */
-	status = 0; /* Used on x86, but not on other arches */
-	START();
-}
-
-/*
- * 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()
-{
-	return;
-}
-
-int _dl_fixup(struct elf_resolve *tpnt)
-{
-	int goof = 0;
-	
-	if (tpnt->next)
-		goof += _dl_fixup(tpnt->next);
-	if (tpnt->dynamic_info[DT_REL]) {
-#ifdef ELF_USES_RELOCA
-		_dl_dprintf(2, "%s: can't handle REL relocation records\n", 
-			_dl_progname);
-		_dl_exit(17);
-#else
-		if (tpnt->init_flag & RELOCS_DONE)
-			return goof;
-		tpnt->init_flag |= RELOCS_DONE;
-		goof += _dl_parse_relocation_information(tpnt, 
-			tpnt->dynamic_info[DT_REL], tpnt->dynamic_info[DT_RELSZ], 0);
-#endif
-	}
-	if (tpnt->dynamic_info[DT_RELA]) {
-#ifdef ELF_USES_RELOCA
-		if (tpnt->init_flag & RELOCS_DONE)
-			return goof;
-		tpnt->init_flag |= RELOCS_DONE;
-		goof += _dl_parse_relocation_information(tpnt, 
-			tpnt->dynamic_info[DT_RELA], tpnt->dynamic_info[DT_RELASZ], 0);
-#else
-		_dl_dprintf(2, "%s: can't handle RELA relocation records\n", 
-			_dl_progname);
-		_dl_exit(18);
-#endif
-	}
-	if (tpnt->dynamic_info[DT_JMPREL]) {
-		if (tpnt->init_flag & JMP_RELOCS_DONE)
-			return goof;
-		tpnt->init_flag |= JMP_RELOCS_DONE;
-		if (!_dl_not_lazy || *_dl_not_lazy == 0)
-			_dl_parse_lazy_relocation_information(tpnt, 
-				tpnt->dynamic_info[DT_JMPREL], tpnt->dynamic_info[DT_PLTRELSZ], 0);
-		else
-			goof += _dl_parse_relocation_information(tpnt, 
-				tpnt->dynamic_info[DT_JMPREL], tpnt->dynamic_info[DT_PLTRELSZ], 0);
-	}
-	return goof;
-}
-
-void *_dl_malloc(int size)
-{
-	void *retval;
-
-#ifdef DL_DEBUG
-	SEND_STDERR("malloc: request for ");
-	SEND_NUMBER_STDERR(size, 0);
-	SEND_STDERR(" bytes\n");
-#endif	
-
-	if (_dl_malloc_function)
-		return (*_dl_malloc_function) (size);
-
-	if (_dl_malloc_addr - _dl_mmap_zero + size > 4096) {
-#ifdef DL_DEBUG
-		SEND_STDERR("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;
-}
-
-char *_dl_getenv(char *symbol, char **envp)
-{
-	char *pnt;
-	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(char *symbol, char **envp)
-{
-	char *pnt;
-	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;
-}
-
-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;
-}
-
-/* Minimum printf which handles only characters, %d's and %s's */
-void _dl_dprintf(int fd, const char *fmt, ...)
-{
-    int num;
-    va_list args;
-    char *start, *ptr, *string;
-    char buf[2048];
-
-    start = ptr = buf;
-    
-    if (!fmt)
-	return;
-
-    if (_dl_strlen(fmt) >= (sizeof(buf)-1))
-	_dl_write(fd, "(overflow)\n", 10);
-
-    _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[13];
-			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[13];
-			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;
-	}
-    }
-    return;
-}
-

ldso/ldso/ldso.c

@@ -91,13 +91,11 @@
  * can transfer control to the user's application.
  */
 
-#include <stdarg.h>
-#include "sysdep.h" /* before elf.h to get ELF_USES_RELOCA right */
-#include <elf.h>
 #include "linuxelf.h"
-#include "hash.h"
-#include "syscall.h"
-#include "string.h"
+#include <stdarg.h>
+#include "ld_hash.h"
+#include "ld_syscall.h"
+#include "ld_string.h"
 #include "../config.h"
 
 #define ALLOW_ZERO_PLTGOT
@@ -117,7 +115,7 @@
 static char *_dl_malloc_addr, *_dl_mmap_zero;
 char *_dl_library_path = 0;		/* Where we look for libraries */
 char *_dl_preload = 0;			/* Things to be loaded before the libs. */
-#include "ld.so.h"			/* Pull in the name of ld.so */
+#include "ld-uClibc.h"			/* Pull in the name of ld.so */
 const char *_dl_progname=_dl_static_progname;
 static char *_dl_not_lazy = 0;
 #ifdef DL_TRACE