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-rw-r--r--plugins/dwarf/v2/form.c276
1 files changed, 276 insertions, 0 deletions
diff --git a/plugins/dwarf/v2/form.c b/plugins/dwarf/v2/form.c
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+++ b/plugins/dwarf/v2/form.c
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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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