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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.  
  39. #include <arch.h>
  40. #include <elf_dyn.h>
  41. #include <symbol.h>
  42. #include <rtld.h>
  43.  
  44. void module_process_pre_arch(module_t *m)
  45. {
  46.     /* Unused */
  47. }
  48.  
  49.  
  50. /**
  51.  * Process (fixup) all relocations in a relocation table.
  52.  */
  53. void rel_table_process(module_t *m, elf_rel_t *rt, size_t rt_size)
  54. {
  55.     int i;
  56.  
  57.     size_t rt_entries;
  58.     size_t r_offset;
  59.     elf_word r_info;
  60.     unsigned rel_type;
  61.     elf_word sym_idx;
  62.     uintptr_t sym_addr;
  63.    
  64.     elf_symbol_t *sym_table;
  65.     elf_symbol_t *sym;
  66.     uint32_t *r_ptr;
  67.     char *str_tab;
  68.    
  69.     elf_symbol_t *sym_def;
  70.     module_t *dest;
  71.  
  72.     DPRINTF("parse relocation table\n");
  73.  
  74.     sym_table = m->dyn.sym_tab;
  75.     rt_entries = rt_size / sizeof(elf_rel_t);
  76.     str_tab = m->dyn.str_tab;
  77.  
  78.     DPRINTF("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries);
  79.    
  80.     for (i = 0; i < rt_entries; ++i) {
  81. //      DPRINTF("symbol %d: ", i);
  82.         r_offset = rt[i].r_offset;
  83.         r_info = rt[i].r_info;
  84.  
  85.         sym_idx = ELF32_R_SYM(r_info);
  86.         sym = &sym_table[sym_idx];
  87.  
  88. /*      DPRINTF("name '%s', value 0x%x, size 0x%x\n",
  89.             str_tab + sym->st_name,
  90.             sym->st_value,
  91.             sym->st_size);
  92. */
  93.         rel_type = ELF32_R_TYPE(r_info);
  94.         r_ptr = (uint32_t *)(r_offset + m->bias);
  95.  
  96.         if (sym->st_name != 0) {
  97. //          DPRINTF("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset);
  98.             sym_def = symbol_def_find(str_tab + sym->st_name,
  99.                 m, &dest);
  100. //          DPRINTF("dest name: '%s'\n", dest->dyn.soname);
  101. //          DPRINTF("dest bias: 0x%x\n", dest->bias);
  102.             if (sym_def) {
  103.                 sym_addr = symbol_get_addr(sym_def, dest);
  104. //              DPRINTF("symbol definition found, addr=0x%x\n", sym_addr);
  105.             } else {
  106.                 DPRINTF("symbol definition not found\n");
  107.                 continue;
  108.             }
  109.         }
  110.  
  111.         switch (rel_type) {
  112.         case R_386_GLOB_DAT:
  113.         case R_386_JUMP_SLOT:
  114. //          DPRINTF("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n");
  115.             *r_ptr = sym_addr;
  116.             break;
  117.  
  118.         case R_386_32:
  119. //          DPRINTF("fixup R_386_32 (b+v+a)\n");
  120.             *r_ptr += sym_addr;
  121.             break;
  122.  
  123.         case R_386_PC32:
  124. //          DPRINTF("fixup R_386_PC32 (b+v+a)\n");
  125.             *r_ptr += sym_addr - (uint32_t) r_ptr;
  126.             break;
  127.            
  128.         case R_386_RELATIVE:
  129. //          DPRINTF("fixup R_386_RELATIVE (b+a)\n");
  130.             *r_ptr += m->bias;
  131.             break;
  132.  
  133.         default:
  134.             printf("Unknown relocation type %d\n", rel_type);
  135.             break;
  136.         }
  137.  
  138.     }
  139.  
  140. }
  141.  
  142. void rela_table_process(module_t *m, elf_rela_t *rt, size_t rt_size)
  143. {
  144.     /* Unused */
  145.     (void)m; (void)rt; (void)rt_size;
  146. }
  147.  
  148. /** @}
  149.  */
  150.