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/* Chrysalide - Outil d'analyse de fichiers binaires
* form.c - chargement en mémoire des valeurs d'attributs
*
* Copyright (C) 2016-2017 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 Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#include "form.h"
#include "../dwarf-int.h"
/******************************************************************************
* *
* Paramètres : format = contenu binaire de débogage à parcourir. *
* cu = unité de compilation parente. *
* form = nature de la valeur à lire. *
* pos = tête de lecture au sein des données. [OUT] *
* value = valeur au format donné lue. [OUT] *
* *
* Description : Lit la valeur correspondant à un type donné. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool read_dwarf_v2_form_value(const GDwarfFormat *format, const dw_compil_unit_header *cu, DwarfForm form, vmpa2t *pos, dw_v2_form_value *value)
{
bool result; /* Bilan de lecture à renvoyer */
GBinContent *content; /* Contenu binaire à parcourir */
SourceEndian endian; /* Boutisme des enregistrements*/
GExeFormat *exe; /* Format d'exécutable rattaché*/
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 */
mrange_t range; /* Couverture d'une section */
vmpa2t iter; /* Point de lecture parallèle */
content = G_BIN_FORMAT(format)->content;
endian = g_binary_format_get_endianness(G_BIN_FORMAT(format));
exe = G_DBG_FORMAT(format)->executable;
switch (form)
{
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)
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;
default:
result = false;
break;
}
return result;
}
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