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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. #include <console.h>
  42.  
  43. /* from librtld */
  44. #include <rtld.h>
  45. #include <dynamic.h>
  46. #include <elf_load.h>
  47. #include <module.h>
  48.  
  49. void program_run(void *entry, pcb_t *pcb);
  50.  
  51. runtime_env_t dload_re;
  52.  
  53. int main(int argc, char *argv[])
  54. {
  55.     static module_t prog;
  56.  
  57.     runtime_env = &dload_re;
  58.  
  59.     DPRINTF("Hello, world! (from dload)\n");
  60.     if (__pcb->dynamic == NULL) {
  61.         printf("This is the dynamic loader. It is not supposed "
  62.             "to be executed directly.\n");
  63.         return -1;
  64.     }
  65.  
  66.     /*
  67.      * First we need to process dynamic sections of the executable
  68.      * program and insert it into the module graph.
  69.      */
  70.  
  71.     DPRINTF("Parse program .dynamic section at 0x%x\n", __pcb->dynamic);
  72.     dynamic_parse(__pcb->dynamic, 0, &prog.dyn);
  73.     prog.bias = 0;
  74.     prog.dyn.soname = "[program]";
  75.  
  76.     /* Initialize list of loaded modules */
  77.     list_initialize(&runtime_env->modules_head);
  78.     list_append(&prog.modules_link, &runtime_env->modules_head);
  79.  
  80.     /* Pointer to program module. Used as root of the module graph. */
  81.     runtime_env->program = &prog;
  82.  
  83.     /* Work around non-existent memory space allocation. */
  84.     runtime_env->next_bias = 0x1000000;
  85.  
  86.     /*
  87.      * Now we can continue with loading all other modules.
  88.      */
  89.  
  90.     DPRINTF("Load all program dependencies\n");
  91.     module_load_deps(&prog);
  92.  
  93.     /*
  94.      * Now relocate/link all modules together.
  95.      */
  96.  
  97.     /* Process relocations in all modules */
  98.     DPRINTF("Relocate all modules\n");
  99.     modules_process_relocs(&prog);
  100.  
  101.     /* Pass runtime evironment pointer through PCB. */
  102.     __pcb->rtld_runtime = (void *) runtime_env;
  103.  
  104.     /*
  105.      * Finally, run the main program.
  106.      */
  107.     DPRINTF("Run program.. (at 0x%lx)\n", (uintptr_t)__pcb->entry);
  108.  
  109. #ifndef RTLD_DEBUG
  110.     console_close();
  111. #endif
  112.     program_run(__pcb->entry, __pcb);
  113.  
  114.     /* not reached */
  115.     return 0;
  116. }
  117.  
  118. /** @}
  119.  */
  120.