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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. #include <rtld.h>
  43. #include <dynamic.h>
  44. #include <elf_load.h>
  45. #include <module.h>
  46. #include <rtld_arch.h>
  47.  
  48. runtime_env_t runtime_env;
  49.  
  50. void program_run(void *entry, pcb_t *pcb);
  51.  
  52. void _rtld_main(void)
  53. {
  54.     static module_t prog;
  55.     module_t *rtld;
  56.  
  57.     printf("Hello, world! (from rtld)\n");
  58.  
  59.     /*
  60.      * First we need to process dynamic sections of the two modules
  61.      * that have been already loaded, that is, of ourselves and of
  62.      * the executable program.
  63.      */
  64.  
  65.     /* rtld_dynamic and rtld->bias were filled out by the bootstrap code */
  66.     rtld = &runtime_env.rtld;
  67.     printf("Parse rtld .dynamic section at 0x%x\n", runtime_env.rtld_dynamic);
  68.     dynamic_parse(runtime_env.rtld_dynamic, rtld->bias, &rtld->dyn);
  69.  
  70.     printf("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.     list_append(&rtld->modules_link, &runtime_env.modules_head);
  79.  
  80.     /* Pointer to program module. Used as root of the dependency graph */
  81.     runtime_env.program = &prog;
  82.  
  83.     /*
  84.      * Now we can continue with loading all other modules.
  85.      */
  86.  
  87.     printf("Load all program dependencies\n");
  88.     module_load_deps(&prog);
  89.  
  90.     /*
  91.      * Now relocate/link all modules together.
  92.      */
  93.  
  94.     /* Process relocations in all modules */
  95.     printf("Relocate all modules\n");
  96.     modules_process_relocs();
  97.  
  98.     /*
  99.      * Finally, run the main program.
  100.      */
  101.     printf("Run program.. (at 0x%x)\n", (uintptr_t)__pcb->entry);
  102.     //__pcb->entry();
  103.     program_run(__pcb->entry, __pcb);
  104. }
  105.  
  106. /** Fake main to satisfy dependency from libc */
  107. int main(int argc, char *argv[])
  108. {
  109.     return 0;
  110. }
  111.  
  112. typedef void (*ep2)(void *);
  113.  
  114. void program_run(void *entry, pcb_t *pcb)
  115. {
  116.     asm (
  117. //      "xorl %%ebx, %%ebx\n"
  118. //      "movl 0(%%ebx), %%ecx\n"
  119.         "mov %%eax, %%ebx\n"
  120.         "jmp *%0\n"
  121.         :: "m" (entry), "a" (pcb)
  122.     );
  123. }
  124.  
  125. /** @}
  126.  */
  127.