Line data    Source code

       1             : /* Return block represented by attribute.
       2             :    Copyright (C) 2004-2010, 2014, 2018 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 2004.
       5             : 
       6             :    This file is free software; you can redistribute it and/or modify
       7             :    it under the terms of either
       8             : 
       9             :      * the GNU Lesser General Public License as published by the Free
      10             :        Software Foundation; either version 3 of the License, or (at
      11             :        your option) any later version
      12             : 
      13             :    or
      14             : 
      15             :      * the GNU General Public License as published by the Free
      16             :        Software Foundation; either version 2 of the License, or (at
      17             :        your option) any later version
      18             : 
      19             :    or both in parallel, as here.
      20             : 
      21             :    elfutils is distributed in the hope that it will be useful, but
      22             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24             :    General Public License for more details.
      25             : 
      26             :    You should have received copies of the GNU General Public License and
      27             :    the GNU Lesser General Public License along with this program.  If
      28             :    not, see <http://www.gnu.org/licenses/>.  */
      29             : 
      30             : #ifdef HAVE_CONFIG_H
      31             : # include <config.h>
      32             : #endif
      33             : 
      34             : #include <dwarf.h>
      35             : #include "libdwP.h"
      36             : 
      37             : 
      38             : int
      39      815505 : dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block)
      40             : {
      41      815505 :   if (attr == NULL)
      42             :     return -1;
      43             : 
      44      815505 :   const unsigned char *datap = attr->valp;
      45      815505 :   const unsigned char *endp = attr->cu->endp;
      46             : 
      47      815505 :   switch (attr->form)
      48             :     {
      49          85 :     case DW_FORM_block1:
      50          85 :       if (unlikely (endp - datap < 1))
      51             :         goto invalid;
      52          85 :       return_block->length = *(uint8_t *) attr->valp;
      53          85 :       return_block->data = attr->valp + 1;
      54          85 :       break;
      55             : 
      56           0 :     case DW_FORM_block2:
      57           0 :       if (unlikely (endp - datap < 2))
      58             :         goto invalid;
      59           0 :       return_block->length = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
      60           0 :       return_block->data = attr->valp + 2;
      61           0 :       break;
      62             : 
      63           0 :     case DW_FORM_block4:
      64           0 :       if (unlikely (endp - datap < 4))
      65             :         goto invalid;
      66           0 :       return_block->length = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
      67           0 :       return_block->data = attr->valp + 4;
      68           0 :       break;
      69             : 
      70      218512 :     case DW_FORM_block:
      71             :     case DW_FORM_exprloc:
      72      218512 :       if (unlikely (endp - datap < 1))
      73             :         goto invalid;
      74      218512 :       get_uleb128 (return_block->length, datap, endp);
      75      218512 :       return_block->data = (unsigned char *) datap;
      76      218512 :       break;
      77             : 
      78           0 :     case DW_FORM_data16:
      79             :       /* The DWARFv5 spec calls this constant class, but we interpret
      80             :          it as a block that the user will need to interpret when
      81             :          converting to a value.  */
      82           0 :       if (unlikely (endp - datap < 16))
      83             :         goto invalid;
      84           0 :       return_block->length = 16;
      85           0 :       return_block->data = (unsigned char *) datap;
      86           0 :       break;
      87             : 
      88      596908 :     default:
      89      596908 :       __libdw_seterrno (DWARF_E_NO_BLOCK);
      90      596908 :       return -1;
      91             :     }
      92             : 
      93      218597 :   if (unlikely (return_block->length > (size_t) (endp - return_block->data)))
      94             :     {
      95             :       /* Block does not fit.  */
      96           0 :     invalid:
      97           0 :       __libdw_seterrno (DWARF_E_INVALID_DWARF);
      98           0 :       return -1;
      99             :     }
     100             : 
     101             :   return 0;
     102             : }
     103             : INTDEF(dwarf_formblock)