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/* Chrysalide - Outil d'analyse de fichiers binaires
* form.h - prototypes pour la transmission des valeurs d'attributs
*
* 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 "form.h"
#include <malloc.h>
#include "format-int.h"
/* Valeurs dans DWARF */
union _dw_form_value
{
/**
* Version 2.
*/
/* DW_FORM_addr */
virt_t address;
/* DW_FORM_data[1248] */
uint8_t data1;
uint16_t data2;
uint32_t data4;
uint64_t data8;
/* DW_FORM_sdata */
leb128_t sdata;
/* DW_FORM_udata */
uleb128_t udata;
/* DW_FORM_block[124]? */
struct
{
const bin_t *start;
phys_t size;
} block;
/* DW_FORM_string */
/* DW_FORM_strp */
const char *string;
/* DW_FORM_flag */
uint8_t flag;
/* DW_FORM_ref[1248] */
uint8_t ref1;
uint16_t ref2;
uint32_t ref4;
uint64_t ref8;
/* DW_FORM_ref_udata */
uleb128_t ref_udata;
/**
* Version 4.
*/
/* DW_FORM_sec_offset */
uint64_t sec_offset;
/* DW_FORM_exprloc */
struct
{
const bin_t *start;
phys_t size;
} expr;
/* DW_FORM_flag_present */
bool has_flag;
/* DW_FORM_ref_sig8 */
uint64_t signature;
};
/******************************************************************************
* *
* Paramètres : format = contenu binaire de débogage à parcourir. *
* content = contenu encadré à parcourir. *
* pos = tête de lecture au sein des données. [OUT] *
* cu = unité de compilation parente. *
* form = nature de la valeur à lire. *
* output = valeur au format donné lue. [OUT] *
* *
* Description : Lit la valeur correspondant à un type donné. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool read_dwarf_form_value(const GDwarfFormat *format, GBinContent *content, vmpa2t *pos, const dw_compil_unit_header *cu, DwarfForm form, dw_form_value **output)
{
bool result; /* Bilan de lecture à renvoyer */
dw_form_value *value; /* Valeur constituée */
SourceEndian endian; /* Boutisme des enregistrements*/
const bin_t *tmp; /* Données quelconques */
uint8_t tmp8; /* Données sur 8 bits */
uint16_t tmp16; /* Données sur 16 bits */
uint32_t tmp32; /* Données sur 32 bits */
uint64_t tmp64; /* Données sur 64 bits */
uleb128_t tmpuleb; /* Données sur xxx bits */
phys_t offset; /* Décalage à appliquer */
GExeFormat *exe; /* Format d'exécutable rattaché*/
mrange_t range; /* Couverture d'une section */
vmpa2t iter; /* Point de lecture parallèle */
value = (dw_form_value *)malloc(sizeof(dw_form_value));
endian = g_binary_format_get_endianness(G_BIN_FORMAT(format));
switch (form)
{
/* Version 2 */
case DW_FORM_addr:
switch (cu->address_size)
{
case 2:
result = g_binary_content_read_u16(content, pos, endian, &tmp16);
if (result) value->address = tmp16;
break;
case 4:
result = g_binary_content_read_u32(content, pos, endian, &tmp32);
if (result) value->address = tmp32;
break;
case 8:
result = g_binary_content_read_u64(content, pos, endian, &tmp64);
if (result) value->address = tmp64;
break;
default:
result = false;
break;
}
break;
case DW_FORM_block2:
result = g_binary_content_read_u16(content, pos, endian, &tmp16);
if (result)
{
value->block.size = tmp16;
goto block_finish;
}
break;
case DW_FORM_block4:
result = g_binary_content_read_u32(content, pos, endian, &tmp32);
if (result)
{
value->block.size = tmp32;
goto block_finish;
}
break;
case DW_FORM_data2:
result = g_binary_content_read_u16(content, pos, endian, &value->data2);
break;
case DW_FORM_data4:
result = g_binary_content_read_u32(content, pos, endian, &value->data4);
break;
case DW_FORM_data8:
result = g_binary_content_read_u64(content, pos, endian, &value->data8);
break;
case DW_FORM_string:
tmp = g_binary_content_get_raw_access(content, pos, 1);
result = (tmp != NULL);
if (result)
{
value->string = (const char *)tmp;
while (result && *tmp != '\0')
{
tmp = g_binary_content_get_raw_access(content, pos, 1);
result = (tmp != NULL);
}
}
break;
case DW_FORM_block:
tmpuleb = 0; /* Pour GCC */
result = g_binary_content_read_uleb128(content, pos, &tmpuleb);
if (!result) break;
value->block.size = tmpuleb;
block_finish:
value->block.start = g_binary_content_get_raw_access(content, pos, value->block.size);
result = (value->block.start != NULL);
break;
case DW_FORM_block1:
result = g_binary_content_read_u8(content, pos, &tmp8);
if (result)
{
value->block.size = tmp8;
goto block_finish;
}
break;
case DW_FORM_data1:
result = g_binary_content_read_u8(content, pos, &value->data1);
break;
case DW_FORM_flag:
result = g_binary_content_read_u8(content, pos, &value->flag);
break;
case DW_FORM_sdata:
result = g_binary_content_read_leb128(content, pos, &value->sdata);
break;
case DW_FORM_strp:
/* Définition des positions */
if (cu->is_32b)
{
result = g_binary_content_read_u32(content, pos, endian, &tmp32);
offset = tmp32;
}
else
{
result = g_binary_content_read_u64(content, pos, endian, &tmp64);
offset = tmp64;
}
/* Lecture dans la section adaptée */
if (result)
{
exe = G_DBG_FORMAT(format)->executable;
result = g_exe_format_get_section_range_by_name(exe, ".debug_str", &range);
}
if (result)
{
copy_vmpa(&iter, get_mrange_addr(&range));
result = g_binary_content_seek(content, &iter, offset);
if (!result)
break;
tmp = g_binary_content_get_raw_access(content, &iter, 1);
result = (tmp != NULL);
if (result)
{
value->string = (const char *)tmp;
while (result && *tmp != '\0')
{
tmp = g_binary_content_get_raw_access(content, &iter, 1);
result = (tmp != NULL);
}
}
}
break;
case DW_FORM_udata:
result = g_binary_content_read_uleb128(content, pos, &value->udata);
break;
case DW_FORM_ref1:
result = g_binary_content_read_u8(content, pos, &value->ref1);
break;
case DW_FORM_ref2:
result = g_binary_content_read_u16(content, pos, endian, &value->ref2);
break;
case DW_FORM_ref4:
result = g_binary_content_read_u32(content, pos, endian, &value->ref4);
break;
case DW_FORM_ref8:
result = g_binary_content_read_u64(content, pos, endian, &value->ref8);
break;
case DW_FORM_ref_udata:
result = g_binary_content_read_uleb128(content, pos, &value->ref_udata);
break;
/* Version 4 */
case DW_FORM_sec_offset:
if (cu->is_32b)
{
result = g_binary_content_read_u32(content, pos, endian, &tmp32);
tmp64 = tmp32;
}
else
result = g_binary_content_read_u64(content, pos, endian, &tmp64);
value->sec_offset = tmp64;
break;
case DW_FORM_exprloc:
//tmpuleb = 0; /* Pour GCC */
result = g_binary_content_read_uleb128(content, pos, &tmpuleb);
if (!result) break;
value->expr.size = tmpuleb;
value->expr.start = g_binary_content_get_raw_access(content, pos, value->expr.size);
result = (value->expr.start != NULL);
break;
case DW_FORM_flag_present:
result = true;
value->has_flag = true;
break;
case DW_FORM_ref_sig8:
result = g_binary_content_read_u64(content, pos, endian, &value->signature);
break;
default:
result = false;
break;
}
if (result)
*output = value;
else
free_dwarf_form_value(value);
return result;
}
/******************************************************************************
* *
* Paramètres : value = valeur à librérer de la mémoire. *
* *
* Description : Supprime de la mémoire une valeur correspondant à un type. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
void free_dwarf_form_value(dw_form_value *value)
{
free(value);
}
/******************************************************************************
* *
* Paramètres : value = valeur au format Dwarf à consulter. *
* form = nature de la valeur à lire. *
* addr = valeur utilisable en interne récupérée. [OUT] *
* *
* Description : Transcrit une valeur Dwarf brute en adresse virtuelle. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool translate_form_into_address(const dw_form_value *value, DwarfForm form, virt_t *addr)
{
bool result; /* Bilan à retourner */
result = true;
switch (form)
{
case DW_FORM_addr:
*addr = value->address;
break;
case DW_FORM_data1:
*addr = value->data1;
break;
case DW_FORM_data2:
*addr = value->data2;
break;
case DW_FORM_data4:
*addr = value->data4;
break;
case DW_FORM_data8:
*addr = value->data8;
break;
default:
result = false;
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : value = valeur au format Dwarf à consulter. *
* form = nature de la valeur à lire. *
* *
* Description : Transcrit une valeur Dwarf brute en chaîne de caractères. *
* *
* Retour : Bilan de l'opération : chaîne de caractères ou NULL si échec.*
* *
* Remarques : - *
* *
******************************************************************************/
const char *translate_form_into_string(const dw_form_value *value, DwarfForm form)
{
const char *result; /* Valeur et bilan à retourner */
switch (form)
{
case DW_FORM_string:
case DW_FORM_strp:
result = value->string;
break;
default:
result = NULL;
break;
}
return result;
}
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