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-rw-r--r--ldso/ldso/boot1.c1214
-rw-r--r--ldso/ldso/ldso.c12
2 files changed, 5 insertions, 1221 deletions
diff --git a/ldso/ldso/boot1.c b/ldso/ldso/boot1.c
deleted file mode 100644
index e61276cce..000000000
--- a/ldso/ldso/boot1.c
+++ /dev/null
@@ -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;
-}
-
diff --git a/ldso/ldso/ldso.c b/ldso/ldso/ldso.c
index e61276cce..0d9df3054 100644
--- a/ldso/ldso/ldso.c
+++ b/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