Prepared to handle the DWARF debug format.

git-svn-id: svn://svn.gna.org/svn/chrysalide/trunk@15 abbe820e-26c8-41b2-8c08-b7b2b41f8b0a

1 files changed, 156 insertions, 0 deletions

diff --git a/src/format/elf/section.c b/src/format/elf/section.c
new file mode 100644
index 0000000..a055f47
--- /dev/null
+++ b/src/format/elf/section.c
@@ -0,0 +1,156 @@
+
+/* OpenIDA - Outil d'analyse de fichiers binaires
+ * section.h - prototypes pour la gestion des sections d'un ELF
+ *
+ * Copyright (C) 2008 Cyrille Bagard
+ *
+ *  This file is part of OpenIDA.
+ *
+ *  OpenIDA 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.
+ *
+ *  OpenIDA 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 "section.h"
+
+
+#include <malloc.h>
+#include <string.h>
+
+
+#include "elf-int.h"
+
+
+
+/* Teste si une section correspond à celle recherchée. */
+bool find_target_elf_section(const elf_format *, const char *, Elf32_Off, Elf32_Shdr *);
+
+
+
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : format = description de l'exécutable à compléter.            *
+*                                                                             *
+*  Description : Charge en mémoire la liste humaine des sections.             *
+*                                                                             *
+*  Retour      : Bilan de l'opération.                                        *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool read_elf_section_names(elf_format *format)
+{
+    off_t offset;                           /* Position des données        */
+    Elf32_Shdr section;                     /* Section visée               */
+
+    offset = format->header.e_shoff + format->header.e_shentsize * format->header.e_shstrndx;
+    if ((offset + sizeof(Elf32_Shdr)) >= EXE_FORMAT(format)->length) return false;
+
+    memcpy(&section, &EXE_FORMAT(format)->content[offset], sizeof(Elf32_Shdr));
+
+    if ((section.sh_offset + section.sh_size) >= EXE_FORMAT(format)->length) return false;
+
+    format->sec_names = (char *)calloc(section.sh_size + 1, sizeof(char));
+    format->sec_size = section.sh_size;
+
+    memcpy(format->sec_names, &EXE_FORMAT(format)->content[section.sh_offset], section.sh_size);
+
+    return true;
+
+}
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : format = description de l'exécutable à consulter.            *
+*                target = nom de la section recherchée.                       *
+*                offset = position de la section à tester.                    *
+*                data   = description de la section trouvée. [OUT]            *
+*                                                                             *
+*  Description : Teste si une section correspond à celle recherchée.          *
+*                                                                             *
+*  Retour      : Bilan de l'opération.                                        *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool find_target_elf_section(const elf_format *format, const char *target, Elf32_Off offset, Elf32_Shdr *data)
+{
+    bool result;                            /* Conclusion à retourner      */
+    Elf32_Shdr section;                     /* Section à analyser          */
+
+    result = false;
+
+    if ((offset + sizeof(Elf32_Shdr)) >= EXE_FORMAT(format)->length) return false;
+
+    memcpy(&section, &EXE_FORMAT(format)->content[offset], sizeof(Elf32_Shdr));
+
+    result = (strcmp(target, &format->sec_names[section.sh_name]) == 0);
+
+    if (result) *data = section;
+
+    return result;
+
+}
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : format  = description de l'exécutable à consulter.           *
+*                target  = nom de la section recherchée.                      *
+*                offset  = position de la section trouvée. [OUT]              *
+*                size    = taille de la section trouvée. [OUT]                *
+*                voffset = adresse virtuelle de la section trouvée. [OUT]     *
+*                                                                             *
+*  Description : Recherche une section donnée au sein de binaire.             *
+*                                                                             *
+*  Retour      : Bilan de l'opération.                                        *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool find_elf_section(const elf_format *format, const char *target, off_t *offset, off_t *size, uint64_t *voffset)
+{
+    bool result;
+    Elf32_Half i;
+    Elf32_Shdr data;
+
+    result = false;
+
+    for (i = 0; i < format->header.e_shnum; i++)
+    {
+        if (i == format->header.e_shstrndx) continue;
+
+        if (find_target_elf_section(format, target,
+                                    format->header.e_shoff + format->header.e_shentsize * i, &data))
+        {
+            *offset = data.sh_offset;
+            *size = data.sh_size;
+
+            if (voffset != NULL)
+                *voffset = data.sh_addr;
+
+            result = true;
+
+        }
+
+    }
+
+    return result;
+
+}