1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* Chrysalide - Outil d'analyse de fichiers binaires
* helper_x86.c - gestion auxiliaire de l'architecture x86
*
* Copyright (C) 2014-2017 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Chrysalide is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
#include "helper_arm.h"
#include "elf-int.h"
#include "symbols.h"
#include "../mangling/demangler.h"
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à compléter. *
* relxxx = section .rel.xxx trouvée (zone à traiter). *
* dynsym = section .dynsym trouvée (info. dynamiques). *
* dynstr = section .dynstr trouvée (chaînes de caractères). *
* *
* Description : Charge en mémoire la liste des symboles relogés. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool load_elf_arm_relocated_symbols(GElfFormat *format, const elf_shdr *relxxx, const elf_shdr *dynsym, const elf_shdr *dynstr)
{
bool result; /* Bilan à retourner */
phys_t rel_start; /* Début de la zone à traiter */
phys_t rel_size; /* Taille de cette même zone */
GBinFormat *base; /* Autre version du format */
phys_t iter; /* Boucle de parcours */
elf_rel reloc; /* Infos de relocalisation */
off_t index; /* Indice de la portion visée */
elf_sym sym; /* Définition complète */
const char *name; /* Nom du symbole trouvé */
virt_t virt; /* Adresse en mémoire virtuelle*/
virt_t final_virt; /* Adresse virtuelle retenue */
bool status; /* Bilan d'une opération */
vmpa2t addr; /* Localisation d'une routine */
GBinRoutine *routine; /* Nouvelle routine trouvée */
GBinSymbol *symbol; /* Nouveau symbole construit */
mrange_t range; /* Couverture mémoire associée */
result = true;
get_elf_section_content(format, relxxx, &rel_start, &rel_size, NULL);
base = G_BIN_FORMAT(format);
for (iter = rel_start; iter < (rel_start + rel_size); )
{
result = read_elf_relocation(format, &iter, &reloc);
if (!result) break;
index = ELF_REL_SYM(format, reloc);
if (!get_elf_symbol_by_index(format, dynsym, index, &sym))
continue;
name = get_elf_symbol_name(format, dynsym, dynstr, index);
if (name == NULL)
{
/* FIXME */
name = "unknown";
}
switch (ELF_REL_TYPE(format, reloc))
{
case R_ARM_JUMP_SLOT:
virt = ELF_SYM(format, sym, st_value);
if (virt == 0) continue;
final_virt = virt & ~0x1;
status = g_exe_format_translate_address_into_vmpa(G_EXE_FORMAT(format), final_virt, &addr);
if (!status) continue;
routine = try_to_demangle_routine(name);
symbol = G_BIN_SYMBOL(routine);
init_mrange(&range, &addr, 0);
g_binary_symbol_set_range(symbol, &range);
/* Comptabilisation pour le désassemblage brut */
g_binary_format_register_code_point(base, virt, false);
break;
default:
printf("Relocation not supported (%lld) !\n", ELF_REL_TYPE(format, reloc));
symbol = NULL;
break;
}
if (symbol != NULL)
g_binary_format_add_symbol(base, symbol);
}
return result;
}
|
