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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup rtld rtld
  30.  * @brief
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  */
  36.  
  37. #include <stdio.h>
  38. #include <unistd.h>
  39. #include <fcntl.h>
  40. #include <loader/pcb.h>
  41.  
  42. /* from librtld */
  43. #include <rtld.h>
  44. #include <dynamic.h>
  45. #include <elf_load.h>
  46. #include <module.h>
  47.  
  48. void program_run(void *entry, pcb_t *pcb);
  49.  
  50. runtime_env_t dload_re;
  51.  
  52. int main(int argc, char *argv[])
  53. {
  54.     static module_t prog;
  55.  
  56.     runtime_env = &dload_re;
  57.  
  58.     DPRINTF("Hello, world! (from dload)\n");
  59.     if (__pcb->dynamic == NULL) {
  60.         printf("This is the dynamic loader. It is not supposed "
  61.             "to be executed directly.\n");
  62.         return -1;
  63.     }
  64.  
  65.     /*
  66.      * First we need to process dynamic sections of the executable
  67.      * program and insert it into the module graph.
  68.      */
  69.  
  70.     DPRINTF("Parse program .dynamic section at 0x%x\n", __pcb->dynamic);
  71.     dynamic_parse(__pcb->dynamic, 0, &prog.dyn);
  72.     prog.bias = 0;
  73.     prog.dyn.soname = "[program]";
  74.  
  75.     /* Initialize list of loaded modules */
  76.     list_initialize(&runtime_env->modules_head);
  77.     list_append(&prog.modules_link, &runtime_env->modules_head);
  78.  
  79.     /* Pointer to program module. Used as root of the module graph. */
  80.     runtime_env->program = &prog;
  81.  
  82.     /* Work around non-existent memory space allocation. */
  83.     runtime_env->next_bias = 0x100000;
  84.  
  85.     /*
  86.      * Now we can continue with loading all other modules.
  87.      */
  88.  
  89.     DPRINTF("Load all program dependencies\n");
  90.     module_load_deps(&prog);
  91.  
  92.     /*
  93.      * Now relocate/link all modules together.
  94.      */
  95.  
  96.     /* Process relocations in all modules */
  97.     DPRINTF("Relocate all modules\n");
  98.     modules_process_relocs(&prog);
  99.  
  100.     /* Pass runtime evironment pointer through PCB. */
  101.     __pcb->rtld_runtime = (void *) runtime_env;
  102.  
  103.     /*
  104.      * Finally, run the main program.
  105.      */
  106.     DPRINTF("Run program.. (at 0x%lx)\n", (uintptr_t)__pcb->entry);
  107.  
  108. #ifndef RTLD_DEBUG
  109.     close_console();
  110. #endif
  111.     program_run(__pcb->entry, __pcb);
  112.  
  113.     /* not reached */
  114.     return 0;
  115. }
  116.  
  117. /** @}
  118.  */
  119.