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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.  
  41. #include <rtld.h>
  42. #include <dynamic.h>
  43. #include <pcb.h>
  44. #include <elf_load.h>
  45. #include <arch.h>
  46.  
  47. runtime_env_t runtime_env;
  48.  
  49. void module_process_relocs(module_t *m)
  50. {
  51.     if (m->dyn.plt_rel == DT_REL) {
  52.         if (m->dyn.rel != NULL)
  53.             rel_table_process(m, m->dyn.rel, m->dyn.rel_sz);
  54.         /* FIXME: this seems wrong */
  55.         if (m->dyn.jmp_rel != NULL)
  56.             rel_table_process(m, m->dyn.jmp_rel, m->dyn.plt_rel_sz);
  57.     } else { /* (m->dyn.plt_rel == DT_RELA) */
  58.         printf("table type DT_RELA\n");
  59.         if (m->dyn.rela != NULL) {
  60.             printf("non-empty\n");
  61.             rela_table_process(m, m->dyn.rela, m->dyn.rela_sz);
  62.         }
  63.     }
  64. }
  65.  
  66. void _rtld_main(void)
  67. {
  68.     pcb_t *pcb;
  69.     elf_info_t lib_info;
  70.     static module_t prog;
  71.     static module_t lib;
  72.     module_t *rtld;
  73.     int rc;
  74.  
  75.     printf("Hello, world! (from rtld)\n");
  76. //  getchar();
  77.  
  78.     /* rtld_dynamic and rtld->bias were filled out by the bootstrap code */
  79.     rtld = &runtime_env.rtld;
  80.     printf("Parse rtld .dynamic section at 0x%x\n", runtime_env.rtld_dynamic);
  81.     dynamic_parse(runtime_env.rtld_dynamic, rtld->bias, &rtld->dyn);
  82. //  getchar();
  83.  
  84.     pcb = __pcb_get();
  85.     printf("Parse program .dynamic section at 0x%x\n", pcb->dynamic);
  86.     dynamic_parse(pcb->dynamic, 0, &prog.dyn);
  87.     prog.bias = 0;
  88.     prog.dyn.soname = "[program]";
  89.  
  90.     printf("Program requested library '%s'\n", prog.dyn.needed);
  91. //  getchar();
  92.    
  93.     rc = elf_load_file("/libc.so.0", 0x20000, &lib_info);
  94.     if (rc < 0) {
  95.         printf("failed to load library\n");
  96.         return;
  97.     }
  98.  
  99.     dynamic_parse(lib_info.dynamic, 0x20000, &lib.dyn);
  100.     lib.bias = 0x20000;
  101.     printf("lib.bias=0x%x\n", lib.bias);
  102.  
  103.     runtime_env.program = &prog;
  104.     runtime_env.libc = &lib;
  105.  
  106.     /* Parse program's relocation tables */
  107.     printf("Resolve references in program\n");
  108.     module_process_relocs(&prog);
  109.  
  110.     /* Parse lib's relocation tables */
  111.     printf("Resolve references in library\n");
  112.     module_process_relocs(&lib);
  113.  
  114.     printf("lib.bias=0x%x\n", lib.bias);
  115.  
  116.     printf("Run program.. (at 0x%x)\n", (uintptr_t)pcb->entry);
  117.     getchar();
  118.     pcb->entry();
  119. }
  120.  
  121. /** @}
  122.  */
  123.