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/* Chrysalide - Outil d'analyse de fichiers binaires
* symbols.c - gestion des symboles d'un DWARF
*
* Copyright (C) 2018 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 Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#include "symbols.h"
#include "die.h"
#include "dwarf-int.h"
#include "form.h"
#include "../../core/params.h"
#include "../../mangling/demangler.h"
/* Charge les informations d'une routine en tant que symbole. */
static bool load_routine_as_symbol_from_dwarf(GDwarfFormat *, const dw_die *, const dw_abbrev *, bool);
/* Charge les informations d'un objet en tant que symbole. */
static bool load_object_as_symbol_from_dwarf(GDwarfFormat *, const dw_die *, const dw_abbrev *, bool);
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à compléter. *
* die = entrée d'informations de débogage à utiliser. *
* abbrev = abréviation déjà chargée sur laquelle s'appuyer. *
* use_virt = oriente le choix de la distinction ultime. *
* *
* Description : Charge les informations d'une routine en tant que symbole. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
static bool load_routine_as_symbol_from_dwarf(GDwarfFormat *format, const dw_die *die, const dw_abbrev *abbrev, bool use_virt)
{
DwarfForm form; /* Type d'une valeur d'attribut*/
const dw_form_value *value; /* Valeur concrète d'attribut */
virt_t virt; /* Adresse virtuelle de départ */
bool status; /* Bilan d'une récupération */
virt_t len; /* Taille de la zone couverte */
vmpa2t addr; /* Localisation complète */
mrange_t range; /* Espace de couverture total */
const char *name; /* Désignation humaine */
char alt_name[6 + VMPA_MAX_LEN]; /* Nom abstrait de substitution*/
GBinRoutine *routine; /* Nouvelle routine trouvée */
GBinSymbol *symbol; /* Nouveau symbole construit */
/* Surface couverte */
value = dw_die_peek_extended_value(die, DW_AT_low_pc, &form);
if (value == NULL) goto lrasfd_bad_start;
status = translate_form_into_address(value, form, &virt);
if (!status) goto lrasfd_bad_start;
value = dw_die_peek_extended_value(die, DW_AT_high_pc, &form);
if (value == NULL) goto lrasfd_bad_start;
status &= translate_form_into_address(value, form, &len);
if (!status) goto lrasfd_bad_start;
if (!g_exe_format_translate_address_into_vmpa(G_DBG_FORMAT(format)->executable, virt, &addr))
init_vmpa(&addr, VMPA_NO_PHYSICAL, virt);
init_mrange(&range, &addr, len);
/* Désignation humaine */
value = dw_die_peek_extended_value(die, DW_AT_name, &form);
if (value == NULL) goto lrasfd_bad_name;
name = translate_form_into_string(value, form);
if (name == NULL)
{
strcpy(alt_name, "func_");
if (use_virt)
vmpa2_virt_to_string(&addr, MDS_UNDEFINED, alt_name + 5, NULL);
else
vmpa2_phys_to_string(&addr, MDS_UNDEFINED, alt_name + 5, NULL);
name = alt_name;
}
/* Intégration en bonne et due forme */
routine = g_binary_format_decode_routine(G_BIN_FORMAT(format), name);
symbol = G_BIN_SYMBOL(routine);
g_binary_symbol_set_range(symbol, &range);
g_binary_format_add_symbol(G_BIN_FORMAT(format), symbol);
printf(" --> [valid ?= %d] start @ 0x%08llx\n", status, virt);
printf(" --> [valid ?= %d] len = 0x%08llx\n", status, len);
printf(" --> [valid ?= %d] name = '%s'\n", status, name);
return true;
lrasfd_bad_start:
lrasfd_bad_name:
return false;
}
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à compléter. *
* die = entrée d'informations de débogage à utiliser. *
* abbrev = abréviation déjà chargée sur laquelle s'appuyer. *
* use_virt = oriente le choix de la distinction ultime. *
* *
* Description : Charge les informations d'un objet en tant que symbole. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
static bool load_object_as_symbol_from_dwarf(GDwarfFormat *format, const dw_die *die, const dw_abbrev *abbrev, bool use_virt)
{
DwarfForm form; /* Type d'une valeur d'attribut*/
const dw_form_value *value; /* Valeur concrète d'attribut */
virt_t virt; /* Adresse virtuelle de départ */
bool status; /* Bilan d'une récupération */
virt_t len; /* Taille de la zone couverte */
vmpa2t addr; /* Localisation complète */
mrange_t range; /* Espace de couverture total */
const char *name; /* Désignation humaine */
char alt_name[5 + VMPA_MAX_LEN]; /* Nom abstrait de substitution*/
GBinRoutine *routine; /* Nouvelle routine trouvée */
GBinSymbol *symbol; /* Nouveau symbole construit */
/* Surface couverte */
/*
value = dw_die_peek_extended_value(die, DW_AT_low_pc, &form);
if (value == NULL) goto lrasfd_bad_start;
status = translate_form_into_address(value, form, &virt);
if (!status) goto lrasfd_bad_start;
value = dw_die_peek_extended_value(die, DW_AT_high_pc, &form);
if (value == NULL) goto lrasfd_bad_start;
status &= translate_form_into_address(value, form, &len);
if (!status) goto lrasfd_bad_start;
if (!g_exe_format_translate_address_into_vmpa(G_DBG_FORMAT(format)->executable, virt, &addr))
init_vmpa(&addr, VMPA_NO_PHYSICAL, virt);
init_mrange(&range, &addr, len);
*/
/* Désignation humaine */
value = dw_die_peek_extended_value(die, DW_AT_name, &form);
if (value == NULL) goto lrasfd_bad_name;
name = translate_form_into_string(value, form);
if (name == NULL)
{
strcpy(alt_name, "obj_");
if (use_virt)
vmpa2_virt_to_string(&addr, MDS_UNDEFINED, alt_name + 5, NULL);
else
vmpa2_phys_to_string(&addr, MDS_UNDEFINED, alt_name + 5, NULL);
name = alt_name;
}
/* Intégration en bonne et due forme */
/*
routine = try_to_demangle_routine(name);
g_binary_symbol_set_range(G_BIN_SYMBOL(routine), &range);
symbol = g_binary_symbol_new(NULL, STP_OBJECT);
g_binary_symbol_attach_routine(symbol, routine);
g_binary_format_add_symbol(G_BIN_FORMAT(format), symbol);
*/
//printf(" --> [valid ?= %d] start @ 0x%08llx\n", status, virt);
//printf(" --> [valid ?= %d] len = 0x%08llx\n", status, len);
//printf(" --> [valid ?= %d] name = '%s'\n", status, name);
return true;
lrasfd_bad_start:
lrasfd_bad_name:
return false;
}
/******************************************************************************
* *
* Paramètres : format = description de l'exécutable à compléter. *
* *
* Description : Charge en mémoire la liste humaine des symboles. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool load_dwarf_symbols(GDwarfFormat *format)
{
bool result; /* Bilan à retourner */
bool no_name; /* Choix de construction de nom*/
typedef struct _die_visit_info
{
GDwarfFormat *format;
bool use_virt;
} die_visit_info;
die_visit_info vinfo; /* Information pour visiteur */
bool catch_dwarf_symbol(const dw_die *die, die_visit_info *info)
{
const dw_abbrev *abbrev; /* Lien vers la représentation */
DwarfTag tag; /* Etiquette à analyser */
bool status; /* Bilan d'un chargement */
abbrev = dw_die_get_abbrev(die);
tag = dwarf_abbreviation_get_tag(abbrev);
switch (tag)
{
case DW_TAG_subprogram:
printf(" DIE ==> %p -> %p // tag = %x\n", die, abbrev, tag);
status = load_routine_as_symbol_from_dwarf(info->format, die, abbrev, info->use_virt);
break;
case DW_TAG_variable:
printf(" DIE ==> %p -> %p // tag = %x\n", die, abbrev, tag);
status = load_object_as_symbol_from_dwarf(info->format, die, abbrev, info->use_virt);
break;
default:
status = true;
break;
}
return status;
}
if (!g_generic_config_get_value(get_main_configuration(), MPK_FORMAT_NO_NAME, &no_name))
return false;
vinfo.format = format;
vinfo.use_virt = no_name;
result = dw_die_visit(format->info_die, (visit_dies_fc)catch_dwarf_symbol, &vinfo);
return result;
}
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