|
|
@@ -1,1309 +0,0 @@
|
|
|
-
|
|
|
-
|
|
|
- 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. */
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- * References to symbols in sharable libraries can be resolved by
|
|
|
- * an ELF sharable library. */
|
|
|
-
|
|
|
-
|
|
|
- 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"
|
|
|
-#include <elf.h>
|
|
|
-#include "linuxelf.h"
|
|
|
-#include "hash.h"
|
|
|
-#include "syscall.h"
|
|
|
-#include "string.h"
|
|
|
-#include "../config.h"
|
|
|
-
|
|
|
-#define ALLOW_ZERO_PLTGOT
|
|
|
-
|
|
|
-
|
|
|
-#define ELFMAGIC ELFMAG
|
|
|
-
|
|
|
-
|
|
|
-#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;
|
|
|
-char *_dl_preload = 0;
|
|
|
-#include "ld.so.h"
|
|
|
-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"
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- 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)
|
|
|
-*/
|
|
|
-
|
|
|
-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;
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- * taken care of fixing up our own relocations. Making static
|
|
|
- * lnline calls is ok, but _no_ function calls. Not yet
|
|
|
- * anyways. */
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
- aux_dat++;
|
|
|
- envp = (char **) aux_dat;
|
|
|
- while (*aux_dat)
|
|
|
- aux_dat++;
|
|
|
- aux_dat++;
|
|
|
-
|
|
|
-
|
|
|
- * when we read in the auxv_t */
|
|
|
- auxv_t[AT_UID].a_type = -1;
|
|
|
-
|
|
|
-
|
|
|
- * 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_inline(&(auxv_t[auxv_entry->a_type]),
|
|
|
- auxv_entry, sizeof(Elf32_auxv_t));
|
|
|
- }
|
|
|
- aux_dat += 2;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- * (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;
|
|
|
-
|
|
|
-
|
|
|
- if (! header || header->e_ident[EI_CLASS] != ELFCLASS32 ||
|
|
|
- header->e_ident[EI_VERSION] != EV_CURRENT ||
|
|
|
- _dl_strncmp_inline((void *)header, ELFMAGIC, SELFMAG) != 0)
|
|
|
- {
|
|
|
- SEND_STDERR("Invalid ELF header\n");
|
|
|
- _dl_exit(0);
|
|
|
- }
|
|
|
-#ifdef DL_DEBUG
|
|
|
- SEND_STDERR("ELF header =");
|
|
|
- SEND_ADDRESS_STDERR(load_addr, 1);
|
|
|
-#endif
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- * 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
|
|
|
-
|
|
|
- {
|
|
|
- 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
|
|
|
-
|
|
|
- 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);
|
|
|
-
|
|
|
-
|
|
|
- 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:
|
|
|
-
|
|
|
- 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
|
|
|
-
|
|
|
-
|
|
|
- dpnt = (Elf32_Dyn *) (*got + load_addr);
|
|
|
-#ifdef DL_DEBUG
|
|
|
- SEND_STDERR("First Dynamic section entry=");
|
|
|
- SEND_ADDRESS_STDERR(dpnt, 1);
|
|
|
-#endif
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- * 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_inline(tpnt, 0, sizeof(*tpnt));
|
|
|
- app_tpnt = DL_MALLOC(sizeof(struct elf_resolve));
|
|
|
- _dl_memset_inline(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_inline(debug_addr, 0, sizeof(*debug_addr));
|
|
|
-
|
|
|
-
|
|
|
- We are only doing ourself right now - we will have to do the rest later */
|
|
|
-
|
|
|
- while (dpnt->d_tag) {
|
|
|
- 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++;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
-
|
|
|
-
|
|
|
- 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);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- 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);
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
-
|
|
|
-
|
|
|
- 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);
|
|
|
-
|
|
|
-
|
|
|
- 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);
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
-
|
|
|
-
|
|
|
- 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);
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
-
|
|
|
-
|
|
|
- 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
|
|
|
-
|
|
|
- if (app_tpnt->dynamic_info[DT_PLTGOT] == 0)
|
|
|
- continue;
|
|
|
-#endif
|
|
|
-
|
|
|
- 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) {
|
|
|
- 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];
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- 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
|
|
|
-
|
|
|
- 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_fprintf(1, "\t%s => not found\n", str);
|
|
|
- else {
|
|
|
-#endif
|
|
|
- _dl_fprintf(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) {
|
|
|
-
|
|
|
- * the library itself when run on a library. */
|
|
|
- if (_dl_strcmp(_dl_progname, str) != 0)
|
|
|
- _dl_fprintf(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)) {
|
|
|
- if ((fd = _dl_open(LDSO_PRELOAD, O_RDONLY)) < 0) {
|
|
|
- _dl_fprintf(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_fprintf(2, "%s: can't map file '%s'\n",
|
|
|
- _dl_progname, LDSO_PRELOAD);
|
|
|
- } else {
|
|
|
- char c, *cp, *cp2;
|
|
|
-
|
|
|
-
|
|
|
- for (cp = preload; *cp; ) {
|
|
|
- if (*cp == ':' || *cp == '\t' || *cp == '\n') {
|
|
|
- *cp++ = ' ';
|
|
|
- } else if (*cp == '#') {
|
|
|
- do
|
|
|
- *cp++ = ' ';
|
|
|
- while (*cp != '\n' && *cp != '\0');
|
|
|
- } else {
|
|
|
- cp++;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- for (cp = preload; *cp && *cp == ' '; cp++)
|
|
|
- ;
|
|
|
-
|
|
|
- while (*cp) {
|
|
|
-
|
|
|
- for (cp2 = cp; *cp && *cp != ' '; cp++)
|
|
|
- ;
|
|
|
- c = *cp;
|
|
|
- *cp = '\0';
|
|
|
-
|
|
|
- tpnt1 = _dl_load_shared_library(0, NULL, cp2);
|
|
|
- if (!tpnt1) {
|
|
|
-#ifdef DL_TRACE
|
|
|
- if (_dl_trace_loaded_objects)
|
|
|
- _dl_fprintf(1, "\t%s => not found\n", cp2);
|
|
|
- else {
|
|
|
-#endif
|
|
|
- _dl_fprintf(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_fprintf(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;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- *cp = c;
|
|
|
- for ( ; *cp && *cp == ' '; cp++)
|
|
|
- ;
|
|
|
- }
|
|
|
-
|
|
|
- _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_fprintf(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_fprintf(1, "\t%s => not found\n", lpnt);
|
|
|
- else {
|
|
|
-#endif
|
|
|
- _dl_fprintf(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_fprintf(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
|
|
|
-
|
|
|
-#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;
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- 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
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
-
|
|
|
-
|
|
|
- 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;
|
|
|
-
|
|
|
- function call. */
|
|
|
- ((void (*)(void)) debug_addr->r_brk) ();
|
|
|
-
|
|
|
- for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
|
|
|
-
|
|
|
- * 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_fprintf(2, tpnt->libname);
|
|
|
- _dl_fprintf(2, ": ");
|
|
|
- if (!_dl_atexit)
|
|
|
- _dl_fprintf(2, "The address is atexit () is 0x0.");
|
|
|
- if (!tpnt->dynamic_info[DT_FINI])
|
|
|
- _dl_fprintf(2, "Invalid .fini section.");
|
|
|
- _dl_fprintf(2, "\n");
|
|
|
- }
|
|
|
-#endif
|
|
|
-#undef DL_DEBUG
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- _dl_elf_main = (int (*)(int, char **, char **)) auxv_t[AT_ENTRY].a_un.a_fcn;
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- * Transfer control to the application.
|
|
|
- */
|
|
|
- status = 0;
|
|
|
- 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_fprintf(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_fprintf(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_fprintf(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;
|
|
|
-}
|
|
|
-
|
|
|
-char *_dl_get_last_path_component(char *path)
|
|
|
-{
|
|
|
- char *s;
|
|
|
-
|
|
|
- s=path+_dl_strlen(path)-1;
|
|
|
-
|
|
|
-
|
|
|
- while (s != path && *s == '/') {
|
|
|
- *s-- = '\0';
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- s = _dl_strrchr(path, '/');
|
|
|
- if (s == NULL || s[1] == '\0')
|
|
|
- return path;
|
|
|
- else
|
|
|
- return s+1;
|
|
|
-}
|
|
|
-
|
|
|
-size_t _dl_strlen(const char * str)
|
|
|
-{
|
|
|
- register char *ptr = (char *) str;
|
|
|
-
|
|
|
- while (*ptr)
|
|
|
- ptr++;
|
|
|
- return (ptr - str);
|
|
|
-}
|
|
|
-
|
|
|
-char * _dl_strcpy(char * dst,const char *src)
|
|
|
-{
|
|
|
- register char *ptr = dst;
|
|
|
-
|
|
|
- while (*src)
|
|
|
- *dst++ = *src++;
|
|
|
- *dst = '\0';
|
|
|
-
|
|
|
- return ptr;
|
|
|
-}
|
|
|
-
|
|
|
-int _dl_strcmp(const char * s1,const char * s2)
|
|
|
-{
|
|
|
- unsigned register char c1, c2;
|
|
|
-
|
|
|
- do {
|
|
|
- c1 = (unsigned char) *s1++;
|
|
|
- c2 = (unsigned char) *s2++;
|
|
|
- if (c1 == '\0')
|
|
|
- return c1 - c2;
|
|
|
- }
|
|
|
- while (c1 == c2);
|
|
|
-
|
|
|
- return c1 - c2;
|
|
|
-}
|
|
|
-
|
|
|
-int _dl_strncmp(const char * s1,const char * s2,size_t len)
|
|
|
-{
|
|
|
- unsigned register char c1 = '\0';
|
|
|
- unsigned register char c2 = '\0';
|
|
|
-
|
|
|
- while (len > 0) {
|
|
|
- c1 = (unsigned char) *s1++;
|
|
|
- c2 = (unsigned char) *s2++;
|
|
|
- if (c1 == '\0' || c1 != c2)
|
|
|
- return c1 - c2;
|
|
|
- len--;
|
|
|
- }
|
|
|
-
|
|
|
- return c1 - c2;
|
|
|
-}
|
|
|
-
|
|
|
-char * _dl_strchr(const char * str,int c)
|
|
|
-{
|
|
|
- register char ch;
|
|
|
-
|
|
|
- do {
|
|
|
- if ((ch = *str) == c)
|
|
|
- return (char *) str;
|
|
|
- str++;
|
|
|
- }
|
|
|
- while (ch);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-char *_dl_strrchr(const char *str, int c)
|
|
|
-{
|
|
|
- register char *prev = 0;
|
|
|
- register char *ptr = (char *) str;
|
|
|
-
|
|
|
- while (*ptr != '\0') {
|
|
|
- if (*ptr == c)
|
|
|
- prev = ptr;
|
|
|
- ptr++;
|
|
|
- }
|
|
|
- if (c == '\0')
|
|
|
- return(ptr);
|
|
|
- return(prev);
|
|
|
-}
|
|
|
-
|
|
|
-void * _dl_memcpy(void * dst, const void * src, size_t len)
|
|
|
-{
|
|
|
- register char *a = dst;
|
|
|
- register const char *b = src;
|
|
|
-
|
|
|
- while (len--)
|
|
|
- *a++ = *b++;
|
|
|
-
|
|
|
- return dst;
|
|
|
-}
|
|
|
-
|
|
|
-void * _dl_memset(void * str,int c,size_t len)
|
|
|
-{
|
|
|
- register char *a = str;
|
|
|
-
|
|
|
- while (len--)
|
|
|
- *a++ = c;
|
|
|
-
|
|
|
- return str;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void _dl_fprintf(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_inline(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_inline(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;
|
|
|
-}
|
|
|
-
|
Eric Andersen