update to ida 7.6, add builds

idasdk76/dbg/linux/android.cpp

@@ -0,0 +1,88 @@
+/*
+        Android specific functions.
+*/
+
+// r_brk():
+// B0003050 70 47 BX LR
+static const uchar bxlr_thumb[] = { 0x70, 0x47 };
+
+#define LINKER "/system/bin/linker"
+
+//--------------------------------------------------------------------------
+// on android /system/bin/linker comes without any symbols.
+// Since there is no other way, we scan the data segment for
+//     dcd 1, ?, r_brk, 0, 0
+// r_debug is located very close to the beginning of the data segment,
+// we should find it fine. In any case, we check only the first 4KB.
+bool linux_debmod_t::add_android_shlib_bpt(const meminfo_vec_t &miv, bool attaching)
+{
+  // find read/writable linker memory range
+  meminfo_vec_t::const_iterator p;
+  ea_t linker_base = BADADDR;
+  for ( p=miv.begin(); p != miv.end(); ++p )
+  {
+    if ( p->name == LINKER )
+    {
+      if ( linker_base == BADADDR )
+        linker_base = p->start_ea;
+      // assume the data segment to be readable and writable
+      if ( (p->perm & 6) == 6 )
+        break;
+    }
+  }
+  if ( p == miv.end() )
+  {
+    msg("Failed to find data segment of " LINKER "\n");
+    return false;
+  }
+
+  // read max 2KB
+  uint32 buf[2048];
+  int nbytes = qmin(p->size(), sizeof(buf));
+  ea_t dataseg = p->start_ea;
+  nbytes = dbg_read_memory(dataseg, buf, nbytes, NULL);
+
+  uint32 *ptr = buf;
+  for ( int i=0; i < nbytes/4-5; i++, ptr++ )
+  {
+    if ( ptr[0] == 1                           // version
+      && (attaching || ptr[1] == 0)            // r_map, 0 at the beginning
+      && (ptr[2] & 1) != 0 && ptr[2] < dataseg // r_brk (Thumb pointer)
+      && (attaching || ptr[3] == 0)            // r_state: RT_CONSISTENT
+      && ptr[4] == 0 )                         // linker baseaddr: always zero?
+    {
+      ea_t r_brk = ptr[2] & ~1;
+      // check if linker is not relocated yet
+      if ( r_brk < linker_base )
+        r_brk += linker_base; // adjust address
+      uchar opcode[2];
+      if ( dbg_read_memory(r_brk, opcode, 2, NULL) == 2
+        && memcmp(opcode, bxlr_thumb, 2) == 0 )
+      {
+        // found it!
+        if ( add_internal_bp(shlib_bpt, r_brk+1) )
+        {
+          dmsg("found r_debug (r_brk=%a)\n", r_brk);
+          return true;
+        }
+      }
+    }
+  }
+  msg("Failed to find r_debug in " LINKER "\n");
+  return false;
+}
+
+//--------------------------------------------------------------------------
+// Android reports shared objects without any path. Try to find full path.
+void linux_debmod_t::make_android_abspath(qstring *in_out_path)
+{
+  if ( qisabspath(in_out_path->c_str()) )
+    return;
+
+  // Apparently /proc didn't return an absolute path. Check /system/lib.
+  // Normally we should not arrive here, this is just for safety.
+  char path[QMAXPATH];
+  qmakepath(path, sizeof(path), "/system/lib", in_out_path->c_str(), NULL);
+  if ( qfileexist(path) )
+    *in_out_path = path;
+}