1 files changed, 115 insertions, 0 deletions
diff --git a/src/arch/dalvik/specins.c b/src/arch/dalvik/specins.c
new file mode 100644
index 0000000..b6a7c4e
--- /dev/null
+++ b/src/arch/dalvik/specins.c
@@ -0,0 +1,115 @@
+
+/* OpenIDA - Outil d'analyse de fichiers binaires
+ * specins.c - gestion des instructions spéciales de la VM Dalvik
+ *
+ * Copyright (C) 2011 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 "specins.h"
+
+
+#include "../../common/endianness.h"
+
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : ctx  = contexte lié à l'exécution du processeur.             *
+*                data = flux de données à analyser.                           *
+*                pos  = position courante dans ce flux.                       *
+*                len  = taille totale des données à analyser.                 *
+*                addr = adresse virtuelle de l'instruction.                   *
+*                                                                             *
+*  Description : Détermine si du code doit être écarté du traitement.         *
+*                                                                             *
+*  Retour      : true si une nouvelle zone de données est à écarter.          *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool g_dalvik_guess_special_instruction(GDalvikContext *ctx, const bin_t *data, off_t pos, off_t len, vmpa_t addr)
+{
+    bool result;                            /* Bilan à retourner           */
+    uint16_t ident;                         /* Valeur lue dans le code     */
+    vmpa_t start;                           /* Début d'une zone de données */
+    vmpa_t end;                             /* Fin d'une zone de données   */
+    uint16_t switch_size;                   /* Taille du switch considéré  */
+    uint16_t array_width;                   /* Taille des éléments         */
+    uint32_t array_size;                    /* Taille du tableau           */
+
+    /* Vérification astucieuse et rapide...*/
+    if (data[pos] != 0x00 /* DOP_NOP */) return false; 
+
+    if (!read_u16(&ident, data, &pos, len, SRE_LITTLE))
+        return false;
+
+    start = addr + sizeof(ident);
+    end = start;
+
+    switch (ident)
+    {
+        case DID_PACKED_SWITCH:
+
+            if (!read_u16(&switch_size, data, &pos, len, SRE_LITTLE))
+                return false;
+
+            end += sizeof(switch_size) + (1 + switch_size) * sizeof(uint32_t);
+
+            g_dalvik_context_skip_new_area(ctx, start, end);
+            result = true;
+
+            break;
+
+        case DID_SPARSE_SWITCH:
+
+            if (!read_u16(&switch_size, data, &pos, len, SRE_LITTLE))
+                return false;
+
+            end += sizeof(switch_size) + (2 * switch_size) * sizeof(uint32_t);
+
+            g_dalvik_context_skip_new_area(ctx, start, end);
+            result = true;
+
+            break;
+
+        case DID_FILL_ARRAY_DATA:
+
+            if (!read_u16(&array_width, data, &pos, len, SRE_LITTLE))
+                return false;
+            if (!read_u32(&array_size, data, &pos, len, SRE_LITTLE))
+                return false;
+
+            end += sizeof(array_width) + sizeof(array_size)
+                + array_width * array_size;
+
+            g_dalvik_context_skip_new_area(ctx, start, end);
+            result = true;
+
+            break;
+
+        default:
+            result = false;
+            break;
+
+    }
+
+    return result;
+
+}