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- /* vi: set sw=4 ts=4: */
- /* Program to load an ELF binary on a linux system, and run it
- * after resolving ELF shared library symbols
- *
- * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
- * David Engel, Hongjiu Lu and Mitch D'Souza
- * Copyright (C) 2001-2002, Erik Andersen
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. The name of the above contributors may not be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- // Support a list of library preloads in /etc/ld.so.preload
- //#define SUPPORT_LDSO_PRELOAD_FILE
- /* 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 or call any functions. No globals initially, since the
- * Global Offset Table (GOT) is initialized by the linker assuming a
- * virtual address of 0, and no function calls initially since the
- * Procedure Linkage Table (PLT) is not yet initialized.
- *
- * There are additional initial 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.
- *
- * 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 to override symbols (i.e. weak symbols and/or
- * LD_PRELOAD). So initially, we only perform 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 Auxiliary Vector Table information sitting on
- * which is provided to us by the kernel, and 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 auxvt. For details see linux/fs/binfmt_elf.c where it calls
- * NEW_AUX_ENT() a bunch of time....
- *
- * Next, we need to find the GOT. On most arches there is a register
- * pointing to the GOT, but just in case (and for new ports) I've added
- * some (slow) C code to locate the GOT for you.
- *
- * This code was originally written for SVr4, and there the kernel
- * would load all text pages R/O, so they needed to call mprotect a
- * zillion times to mark all text pages as writable so dynamic linking
- * would succeed. Then when they were done, they would change the
- * protections for all the pages back again. Well, under Linux
- * everything is loaded writable (since Linux does copy on write
- * anyways) so all the mprotect stuff has been disabled.
- *
- * Initially, we do not have access to _dl_malloc since we can't yet
- * make function calls, so we mmap one page to use as scratch space.
- * Later on, when we can call _dl_malloc we reuse this this memory.
- * This is also beneficial, 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 "ld_syscall.h"
- #include "linuxelf.h"
- #include "ld_hash.h"
- #include "ld_string.h"
- #include "dlfcn.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 LD_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 LD_MALLOC.
- */
- #define REALIGN() malloc_buffer = (char *) (((unsigned long) malloc_buffer + 3) & ~(3))
- char *_dl_library_path = 0; /* Where we look for libraries */
- char *_dl_preload = 0; /* Things to be loaded before the libs. */
- char *_dl_ldsopath = 0;
- static char *_dl_not_lazy = 0;
- #ifdef __SUPPORT_LD_DEBUG__
- static char *_dl_debug = 0;
- static char *_dl_debug_symbols = 0;
- static char *_dl_debug_move = 0;
- static char *_dl_debug_reloc = 0;
- static char *_dl_debug_detail = 0;
- static char *_dl_debug_nofixups = 0;
- static char *_dl_debug_bindings = 0;
- static int _dl_debug_file = 2;
- #else
- #define _dl_debug_file 2
- #endif
- static char *_dl_malloc_addr, *_dl_mmap_zero;
- static char *_dl_trace_loaded_objects = 0;
- 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;
- int _dl_fixup(struct elf_resolve *tpnt);
- void _dl_debug_state(void);
- char *_dl_get_last_path_component(char *path);
- static void _dl_get_ready_to_run(struct elf_resolve *tpnt, struct elf_resolve *app_tpnt,
- unsigned long load_addr, unsigned long *hash_addr, Elf32_auxv_t auxvt[AT_EGID + 1],
- char **envp, struct r_debug *debug_addr);
- #include "boot1_arch.h"
- #include "ldso.h" /* Pull in the name of ld.so */
- /* 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
- auxvt[0...N] Auxiliary Vector Table elements (mixed types)
- */
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- /* 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
- LD_BOOT(unsigned long args) __attribute__ ((unused));
- LD_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 elf_resolve *app_tpnt;
- Elf32_auxv_t auxvt[AT_EGID + 1];
- unsigned char *malloc_buffer, *mmap_zero;
- Elf32_Dyn *dpnt;
- Elf32_Dyn *dpnt_debug = NULL;
- unsigned long *hash_addr;
- struct r_debug *debug_addr;
- int indx;
- int status;
- /* WARNING! -- we cannot make _any_ funtion calls until we have
- * taken care of fixing up our own relocations. Making static
- * inline 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__) || defined (__mips__)
- 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 auxvt */
- auxvt[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 auxvt,
- * sort and store them in auxvt 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(&(auxvt[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 = auxvt[AT_BASE].a_un.a_val;
- header = (elfhdr *) auxvt[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
- #if !defined(__powerpc__) && !defined(__mips__) && !defined(__sh__)
- || _dl_strncmp((void *) header, ELFMAGIC, SELFMAG) != 0
- #else
- || header->e_ident[EI_MAG0] != ELFMAG0
- || header->e_ident[EI_MAG1] != ELFMAG1
- || header->e_ident[EI_MAG2] != ELFMAG2
- || header->e_ident[EI_MAG3] != ELFMAG3
- #endif
- ) {
- SEND_STDERR("Invalid ELF header\n");
- _dl_exit(0);
- }
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- 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));
- #elif defined(__mips__)
- __asm__("\tmove %0, $28\n\tsubu %0,%0,0x7ff0\n\t":"=r"(got));
- #elif defined(__sh__)
- __asm__(
- " mov.l 1f, %0\n"
- " mova 1f, r0\n"
- " bra 2f\n"
- " add r0, %0\n"
- " .balign 4\n"
- "1: .long _GLOBAL_OFFSET_TABLE_\n"
- "2:" : "=r" (got) : : "r0");
- #elif defined(__cris__)
- __asm__("\tmove.d $pc,%0\n\tsub.d .:GOTOFF,%0\n\t":"=r"(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 __SUPPORT_LD_DEBUG_EARLY__
- 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 __SUPPORT_LD_DEBUG_EARLY__
- 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 = LD_MALLOC(sizeof(struct elf_resolve));
- _dl_memset(tpnt, 0, sizeof(*tpnt));
- app_tpnt = LD_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 = LD_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 defined(__mips__)
- if (dpnt->d_tag == DT_MIPS_GOTSYM)
- tpnt->mips_gotsym = (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_LOCAL_GOTNO)
- tpnt->mips_local_gotno = (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_SYMTABNO)
- tpnt->mips_symtabno = (unsigned long) dpnt->d_un.d_val;
- #endif
- 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 *) auxvt[AT_PHDR].a_un.a_ptr;
- for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++)
- if (ppnt->p_type == PT_DYNAMIC) {
- dpnt = (Elf32_Dyn *) ppnt->p_vaddr;
- while (dpnt->d_tag) {
- #if defined(__mips__)
- if (dpnt->d_tag == DT_MIPS_GOTSYM)
- app_tpnt->mips_gotsym =
- (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_LOCAL_GOTNO)
- app_tpnt->mips_local_gotno =
- (unsigned long) dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_MIPS_SYMTABNO)
- app_tpnt->mips_symtabno =
- (unsigned long) dpnt->d_un.d_val;
- #endif
- 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)
- #ifdef FORCE_SHAREABLE_TEXT_SEGMENTS
- dpnt->d_un.d_val = (unsigned long) debug_addr;
- #else
- dpnt_debug = dpnt;
- #endif
- 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;
- #ifndef FORCE_SHAREABLE_TEXT_SEGMENTS
- /* 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 *) auxvt[AT_BASE].a_un.a_ptr;
- ppnt = (elf_phdr *) ((int)auxvt[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 & PAGE_ALIGN)),
- (ppnt->p_vaddr & ADDR_ALIGN) + (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 *) auxvt[AT_PHDR].a_un.a_ptr;
- for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++) {
- if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
- _dl_mprotect((void *) (ppnt->p_vaddr & PAGE_ALIGN),
- (ppnt->p_vaddr & ADDR_ALIGN) +
- (unsigned long) ppnt->p_filesz,
- PROT_READ | PROT_WRITE | PROT_EXEC);
- }
- }
- }
- /* Now we can store the debug structure address */
- dpnt_debug->d_un.d_val = (unsigned long) debug_addr;
- #endif
- #if defined(__mips__)
- /*
- * For MIPS we have to do stuff to the GOT before we do relocations.
- */
- PERFORM_BOOTSTRAP_GOT(got);
- #endif
- /* OK, now do the relocations. We do not do a lazy binding here, so
- that once we are done, we have considerably more flexibility. */
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("About to do library loader relocations.\n");
- #endif
- goof = 0;
- for (indx = 0; indx < 2; indx++) {
- unsigned 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++;
- }
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- SEND_STDERR("About to fixup symbol: ");
- SEND_STDERR(strtab + symtab[symtab_index].st_name);
- SEND_STDERR("\n");
- #endif
- }
- /*
- * 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);
- }
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- /* Wahoo!!! */
- _dl_dprintf(_dl_debug_file, "Done relocating library loader, so we can now\n\tuse globals and make function calls!\n");
- #endif
- if (argv[0]) {
- _dl_progname = argv[0];
- }
- /* Start to build the tables of the modules that are required for
- * this beast to run. We start with the basic executable, and then
- * go from there. Eventually we will run across ourself, and we
- * will need to properly deal with that as well. */
- /* Make it so _dl_malloc can use the page of memory we have already
- * allocated, so we shouldn't need to grab any more memory */
- _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. */
- _dl_get_ready_to_run(tpnt, app_tpnt, load_addr, hash_addr, auxvt, envp, debug_addr);
- /* OK we are done here. Turn out the lights, and lock up. */
- _dl_elf_main = (int (*)(int, char **, char **)) auxvt[AT_ENTRY].a_un.a_fcn;
- /*
- * Transfer control to the application.
- */
- status = 0; /* Used on x86, but not on other arches */
- #if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file,"\ntransfering control: %s\n\n", _dl_progname);
- #endif
- START();
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- static void debug_fini (int status, void *arg)
- {
- (void)status;
- _dl_dprintf(_dl_debug_file,"\ncalling fini: %s\n\n", (const char*)arg);
- }
- #endif
- static void _dl_get_ready_to_run(struct elf_resolve *tpnt, struct elf_resolve *app_tpnt,
- unsigned long load_addr, unsigned long *hash_addr, Elf32_auxv_t auxvt[AT_EGID + 1],
- char **envp, struct r_debug *debug_addr)
- {
- elf_phdr *ppnt;
- char *lpntstr;
- int i, _dl_secure, goof = 0;
- struct dyn_elf *rpnt;
- struct elf_resolve *tcurr;
- struct elf_resolve *tpnt1;
- unsigned long brk_addr, *lpnt;
- int (*_dl_atexit) (void *);
- #if defined (__SUPPORT_LD_DEBUG__)
- int (*_dl_on_exit) (void (*FUNCTION)(int STATUS, void *ARG),void*);
- #endif
- /* 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);
- tpnt->chains = hash_addr;
- tpnt->next = 0;
- tpnt->libname = 0;
- tpnt->libtype = program_interpreter;
- tpnt->loadaddr = (char *) load_addr;
- #ifdef ALLOW_ZERO_PLTGOT
- if (tpnt->dynamic_info[DT_PLTGOT])
- #endif
- {
- INIT_GOT(lpnt, tpnt);
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "GOT found at %x\n", lpnt);
- #endif
- }
- /* OK, this was a big step, now we need to scan all of the user images
- and load them properly. */
- {
- elfhdr *epnt;
- elf_phdr *myppnt;
- int j;
- epnt = (elfhdr *) auxvt[AT_BASE].a_un.a_ptr;
- tpnt->n_phent = epnt->e_phnum;
- tpnt->ppnt = myppnt = (elf_phdr *) (load_addr + epnt->e_phoff);
- for (j = 0; j < epnt->e_phnum; j++, myppnt++) {
- if (myppnt->p_type == PT_DYNAMIC) {
- tpnt->dynamic_addr = myppnt->p_vaddr + load_addr;
- #if defined(__mips__)
- {
- int k = 1;
- Elf32_Dyn *dpnt = (Elf32_Dyn *) tpnt->dynamic_addr;
- while(dpnt->d_tag) {
- dpnt++;
- k++;
- }
- tpnt->dynamic_size = k * sizeof(Elf32_Dyn);
- }
- #else
- tpnt->dynamic_size = myppnt->p_filesz;
- #endif
- }
- }
- }
- brk_addr = 0;
- rpnt = NULL;
- /* At this point we are now free to examine the user application,
- and figure out which libraries are supposed to be called. Until
- we have this list, we will not be completely ready for dynamic linking */
- ppnt = (elf_phdr *) auxvt[AT_PHDR].a_un.a_ptr;
- for (i = 0; i < auxvt[AT_PHNUM].a_un.a_val; i++, ppnt++) {
- if (ppnt->p_type == PT_LOAD) {
- if (ppnt->p_vaddr + 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. */
- #if defined(__mips__)
- {
- int i = 1;
- Elf32_Dyn *dpnt = (Elf32_Dyn *) tpnt->dynamic_addr;
- while(dpnt->d_tag) {
- dpnt++;
- i++;
- }
- app_tpnt = _dl_add_elf_hash_table("", 0,
- app_tpnt->dynamic_info, ppnt->p_vaddr,
- (i * sizeof(Elf32_Dyn)));
- }
- #else
- app_tpnt = _dl_add_elf_hash_table("", 0,
- app_tpnt->dynamic_info, ppnt->p_vaddr, ppnt->p_filesz);
- #endif
- _dl_loaded_modules->libtype = elf_executable;
- _dl_loaded_modules->ppnt = (elf_phdr *) auxvt[AT_PHDR].a_un.a_ptr;
- _dl_loaded_modules->n_phent = auxvt[AT_PHNUM].a_un.a_val;
- _dl_symbol_tables = rpnt = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
- _dl_memset(rpnt, 0, sizeof(*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);
- }
- /* OK, fill this in - we did not have this before */
- if (ppnt->p_type == PT_INTERP) {
- int readsize = 0;
- char *pnt, *pnt1, buf[1024];
- tpnt->libname = _dl_strdup((char *) ppnt->p_offset +
- (auxvt[AT_PHDR].a_un.a_val & PAGE_ALIGN));
-
- /* Determine if the shared lib loader is a symlink */
- _dl_memset(buf, 0, sizeof(buf));
- readsize = _dl_readlink(tpnt->libname, buf, sizeof(buf));
- if (readsize > 0 && readsize < (int)(sizeof(buf)-1)) {
- pnt1 = _dl_strrchr(buf, '/');
- if (pnt1 && buf != pnt1) {
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "changing tpnt->libname from '%s' to '%s'\n", tpnt->libname, buf);
- #endif
- tpnt->libname = _dl_strdup(buf);
- }
- }
- /* Store the path where the shared lib loader was found for
- * later use */
- pnt = _dl_strdup(tpnt->libname);
- pnt1 = _dl_strrchr(pnt, '/');
- if (pnt != pnt1) {
- *pnt1 = '\0';
- _dl_ldsopath = pnt;
- } else {
- _dl_ldsopath = tpnt->libname;
- }
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Lib Loader:\t(%x) %s\n", tpnt->loadaddr, tpnt->libname);
- #endif
- }
- }
- /* Now we need to figure out what kind of options are selected.
- Note that for SUID programs we ignore the settings in LD_LIBRARY_PATH */
- {
- _dl_not_lazy = _dl_getenv("LD_BIND_NOW", envp);
- if ((auxvt[AT_UID].a_un.a_val == -1 && _dl_suid_ok()) ||
- (auxvt[AT_UID].a_un.a_val != -1 &&
- auxvt[AT_UID].a_un.a_val == auxvt[AT_EUID].a_un.a_val
- && auxvt[AT_GID].a_un.a_val== auxvt[AT_EGID].a_un.a_val)) {
- _dl_secure = 0;
- _dl_preload = _dl_getenv("LD_PRELOAD", envp);
- _dl_library_path = _dl_getenv("LD_LIBRARY_PATH", envp);
- } else {
- _dl_secure = 1;
- _dl_preload = _dl_getenv("LD_PRELOAD", envp);
- _dl_unsetenv("LD_AOUT_PRELOAD", envp);
- _dl_unsetenv("LD_LIBRARY_PATH", envp);
- _dl_unsetenv("LD_AOUT_LIBRARY_PATH", envp);
- _dl_library_path = NULL;
- }
- }
- #ifdef __SUPPORT_LD_DEBUG__
- _dl_debug = _dl_getenv("LD_DEBUG", envp);
- if (_dl_debug)
- {
- if (_dl_strstr(_dl_debug, "all")) {
- _dl_debug_detail = _dl_debug_move = _dl_debug_symbols
- = _dl_debug_reloc = _dl_debug_bindings = _dl_debug_nofixups = _dl_strstr(_dl_debug, "all");
- }
- else {
- _dl_debug_detail = _dl_strstr(_dl_debug, "detail");
- _dl_debug_move = _dl_strstr(_dl_debug, "move");
- _dl_debug_symbols = _dl_strstr(_dl_debug, "sym");
- _dl_debug_reloc = _dl_strstr(_dl_debug, "reloc");
- _dl_debug_nofixups = _dl_strstr(_dl_debug, "nofix");
- _dl_debug_bindings = _dl_strstr(_dl_debug, "bind");
- }
- }
- {
- const char *dl_debug_output;
-
- dl_debug_output = _dl_getenv("LD_DEBUG_OUTPUT", envp);
- if (dl_debug_output)
- {
- char tmp[22], *tmp1, *filename;
- int len1, len2;
-
- _dl_memset(tmp, 0, sizeof(tmp));
- tmp1=_dl_simple_ltoa( tmp, (unsigned long)_dl_getpid());
- len1 = _dl_strlen(dl_debug_output);
- len2 = _dl_strlen(tmp1);
- filename = _dl_malloc(len1+len2+2);
- if (filename)
- {
- _dl_strcpy (filename, dl_debug_output);
- filename[len1] = '.';
- _dl_strcpy (&filename[len1+1], tmp1);
- _dl_debug_file= _dl_open (filename, O_WRONLY|O_CREAT);
- if (_dl_debug_file<0)
- {
- _dl_debug_file = 2;
- _dl_dprintf (2, "can't open file: '%s'\n",filename);
- }
- }
- }
- }
-
-
- #endif
- _dl_trace_loaded_objects = _dl_getenv("LD_TRACE_LOADED_OBJECTS", envp);
- #ifndef __LDSO_LDD_SUPPORT__
- if (_dl_trace_loaded_objects) {
- _dl_dprintf(_dl_debug_file, "Use the ldd provided by uClibc\n");
- _dl_exit(1);
- }
- #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
- 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, &rpnt, NULL, str);
- if (!tpnt1) {
- #ifdef __LDSO_LDD_SUPPORT__
- 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 __LDSO_LDD_SUPPORT__
- }
- #endif
- } else {
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
- #endif
- #ifdef __LDSO_LDD_SUPPORT__
- if (_dl_trace_loaded_objects
- && tpnt1->usage_count==1) {
- /* this is a real hack to make ldd not print
- * the library itself when run on a library. */
- if (_dl_strcmp(_dl_progname, str) != 0)
- _dl_dprintf(1, "\t%s => %s (0x%x)\n", str, tpnt1->libname,
- (unsigned) tpnt1->loadaddr);
- }
- #endif
- }
- }
- *str2 = c;
- str = str2;
- while (*str == ':' || *str == ' ' || *str == '\t')
- str++;
- }
- }
- #ifdef SUPPORT_LDSO_PRELOAD_FILE
- {
- int fd;
- struct stat st;
- char *preload;
- if (!_dl_stat(LDSO_PRELOAD, &st) && st.st_size > 0) {
- if ((fd = _dl_open(LDSO_PRELOAD, O_RDONLY)) < 0) {
- _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, &rpnt, NULL, cp2);
- if (!tpnt1) {
- #ifdef __LDSO_LDD_SUPPORT__
- 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 __LDSO_LDD_SUPPORT__
- }
- #endif
- } else {
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
- #endif
- #ifdef __LDSO_LDD_SUPPORT__
- if (_dl_trace_loaded_objects
- && tpnt1->usage_count==1) {
- _dl_dprintf(1, "\t%s => %s (0x%x)\n", cp2,
- tpnt1->libname, (unsigned) tpnt1->loadaddr);
- }
- #endif
- }
- /* find start of next library */
- *cp = c;
- for ( /*nada */ ; *cp && *cp == ' '; cp++)
- /*nada */ ;
- }
- _dl_munmap(preload, st.st_size + 1);
- }
- }
- }
- }
- #endif
- for (tcurr = _dl_loaded_modules; tcurr; tcurr = tcurr->next) {
- Elf32_Dyn *dpnt;
- for (dpnt = (Elf32_Dyn *) tcurr->dynamic_addr; dpnt->d_tag;
- dpnt++) {
- if (dpnt->d_tag == DT_NEEDED) {
- lpntstr = tcurr->loadaddr + tcurr->dynamic_info[DT_STRTAB] +
- dpnt->d_un.d_val;
- if (_dl_strcmp(lpntstr, "libc.so.6") == 0) {
- _dl_dprintf(2, "%s: linked against GNU libc!\n", _dl_progname);
- _dl_exit(150);
- }
- if (tpnt && _dl_strcmp(lpntstr, _dl_get_last_path_component(tpnt->libname)) == 0) {
- struct elf_resolve *ttmp;
- #ifdef __LDSO_LDD_SUPPORT__
- if (_dl_trace_loaded_objects && tpnt->usage_count==1) {
- _dl_dprintf(1, "\t%s => %s (0x%x)\n",
- lpntstr, 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->next->prev = rpnt;
- 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, &rpnt, tcurr, lpntstr)))
- {
- #ifdef __LDSO_LDD_SUPPORT__
- if (_dl_trace_loaded_objects)
- _dl_dprintf(1, "\t%s => not found\n", lpntstr);
- else {
- #endif
- _dl_dprintf(2, "%s: can't load library '%s'\n", _dl_progname, lpntstr);
- _dl_exit(16);
- #ifdef __LDSO_LDD_SUPPORT__
- }
- #endif
- } else {
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Loading:\t(%x) %s\n", tpnt1->loadaddr, tpnt1->libname);
- #endif
- #ifdef __LDSO_LDD_SUPPORT__
- if (_dl_trace_loaded_objects && tpnt1->usage_count==1)
- _dl_dprintf(1, "\t%s => %s (0x%x)\n", lpntstr, tpnt1->libname,
- (unsigned) tpnt1->loadaddr);
- #endif
- }
- }
- }
- }
- #ifdef USE_CACHE
- _dl_unmap_cache();
- #endif
- /* ldd uses uses this. I am not sure how you pick up the other flags */
- #ifdef __LDSO_LDD_SUPPORT__
- 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) {
- 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->next->prev = rpnt;
- 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;
- }
- #ifdef __LDSO_LDD_SUPPORT__
- if (_dl_trace_loaded_objects) {
- _dl_dprintf(1, "\t%s => %s (0x%x)\n", rpnt->dyn->libname + (_dl_strlen(_dl_ldsopath)) + 1,
- rpnt->dyn->libname, rpnt->dyn->loadaddr);
- _dl_exit(0);
- }
- #endif
- #ifdef __mips__
- /*
- * Relocation of the GOT entries for MIPS have to be done
- * after all the libraries have been loaded.
- */
- _dl_perform_mips_global_got_relocations(_dl_loaded_modules);
- #endif
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Beginning relocation fixups\n");
- #endif
- /*
- * OK, now all of the kids are tucked into bed in their proper addresses.
- * Now we go through and look for REL and RELA records that indicate fixups
- * to the GOT tables. We need to do this in reverse order so that COPY
- * directives work correctly */
- 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. */
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "Beginning copy fixups\n");
- #endif
- if (_dl_symbol_tables)
- goof += _dl_copy_fixups(_dl_symbol_tables);
- #ifdef __LDSO_LDD_SUPPORT__
- 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 *) (intptr_t) _dl_find_hash("___brk_addr", NULL, NULL, symbolrel);
-
- if (_dl_brkp) {
- *_dl_brkp = brk_addr;
- }
- _dl_envp = (unsigned long *) (intptr_t) _dl_find_hash("__environ", NULL, NULL, symbolrel);
- if (_dl_envp) {
- *_dl_envp = (unsigned long) envp;
- }
- #ifndef FORCE_SHAREABLE_TEXT_SEGMENTS
- {
- unsigned int j;
- elf_phdr *myppnt;
- /* We had to set the protections of all pages to R/W for dynamic linking.
- Set text pages back to R/O */
- for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
- for (myppnt = tpnt->ppnt, j = 0; j < tpnt->n_phent; j++, myppnt++) {
- if (myppnt->p_type == PT_LOAD && !(myppnt->p_flags & PF_W) && tpnt->dynamic_info[DT_TEXTREL]) {
- _dl_mprotect((void *) (tpnt->loadaddr + (myppnt->p_vaddr & PAGE_ALIGN)),
- (myppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) myppnt->p_filesz, LXFLAGS(myppnt->p_flags));
- }
- }
- }
- }
- #endif
- _dl_atexit = (int (*)(void *)) (intptr_t) _dl_find_hash("atexit", NULL, NULL, symbolrel);
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_on_exit = (int (*)(void (*)(int, void *),void*))
- (intptr_t) _dl_find_hash("on_exit", NULL, NULL, symbolrel);
- #endif
- /*
- * 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 (rpnt = _dl_symbol_tables; rpnt!=NULL&& rpnt->next!=NULL; rpnt=rpnt->next)
- ;
-
- for (;rpnt!=NULL; rpnt=rpnt->prev)
- {
- tpnt = rpnt->dyn;
- if (tpnt->libtype == program_interpreter)
- continue;
- /* Apparently crt0/1 for the application is responsible for handling this.
- * We only need to run the init/fini for shared libraries
- */
- if (tpnt->libtype == elf_executable)
- break; /* at this point all shared libs are initialized !! */
- if (tpnt->init_flag & INIT_FUNCS_CALLED)
- continue;
- tpnt->init_flag |= INIT_FUNCS_CALLED;
- if (tpnt->dynamic_info[DT_INIT]) {
- _dl_elf_init = (int (*)(void)) (intptr_t) (tpnt->loadaddr + tpnt->dynamic_info[DT_INIT]);
-
- #if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file,"\ncalling init: %s\n\n", tpnt->libname);
- #endif
- (*_dl_elf_init) ();
- }
- if (_dl_atexit && tpnt->dynamic_info[DT_FINI]) {
- (*_dl_atexit) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI]);
- #if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug && _dl_on_exit)
- {
- (*_dl_on_exit)(debug_fini, tpnt->libname);
- }
- #endif
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- else {
- if (!_dl_atexit)
- _dl_dprintf(_dl_debug_file, "%s: The address of atexit () is 0x0.\n", tpnt->libname);
- #if 0
- if (!tpnt->dynamic_info[DT_FINI])
- _dl_dprintf(_dl_debug_file, "%s: Invalid .fini section.\n", tpnt->libname);
- #endif
- }
- #endif
- }
- }
- /*
- * 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 defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) _dl_dprintf(_dl_debug_file,"\nrelocation processing: %s", tpnt->libname);
- #endif
-
- 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);
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug) {
- _dl_dprintf(_dl_debug_file,"\nrelocation processing: %s", tpnt->libname);
- _dl_dprintf(_dl_debug_file,"; finished\n\n");
- }
- #endif
- return goof;
- }
- void *_dl_malloc(int size)
- {
- void *retval;
- #if 0
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "malloc: request for %d bytes\n", size);
- #endif
- #endif
- if (_dl_malloc_function)
- return (*_dl_malloc_function) (size);
- if (_dl_malloc_addr - _dl_mmap_zero + size > 4096) {
- #ifdef __SUPPORT_LD_DEBUG_EARLY__
- _dl_dprintf(_dl_debug_file, "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(const char *symbol, char **envp)
- {
- char *pnt;
- const char *pnt1;
- while ((pnt = *envp++)) {
- pnt1 = symbol;
- while (*pnt && *pnt == *pnt1)
- pnt1++, pnt++;
- if (!*pnt || *pnt != '=' || *pnt1)
- continue;
- return pnt + 1;
- }
- return 0;
- }
- void _dl_unsetenv(const char *symbol, char **envp)
- {
- char *pnt;
- const char *pnt1;
- char **newenvp = envp;
- for (pnt = *envp; pnt; pnt = *++envp) {
- pnt1 = symbol;
- while (*pnt && *pnt == *pnt1)
- pnt1++, pnt++;
- if (!*pnt || *pnt != '=' || *pnt1)
- *newenvp++ = *envp;
- }
- *newenvp++ = *envp;
- return;
- }
- 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;
- }
- /* Minimal printf which handles only %s, %d, and %x */
- void _dl_dprintf(int fd, const char *fmt, ...)
- {
- int num;
- va_list args;
- char *start, *ptr, *string;
- 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[22];
- num = va_arg(args, int);
- string = _dl_simple_ltoa(tmp, num);
- _dl_write(fd, string, _dl_strlen(string));
- break;
- }
- case 'x':
- case 'X':
- {
- char tmp[22];
- num = va_arg(args, int);
- string = _dl_simple_ltoahex(tmp, num);
- _dl_write(fd, string, _dl_strlen(string));
- break;
- }
- default:
- _dl_write(fd, "(null)", 6);
- break;
- }
- start = ptr;
- } else {
- _dl_write(fd, start, _dl_strlen(start));
- start = NULL;
- }
- }
- return;
- }
- #include "hash.c"
- #include "readelflib1.c"
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