Line data    Source code

       1             : /* Return address represented by attribute.
       2             :    Copyright (C) 2003-2010, 2018 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include <dwarf.h>
      34             : #include "libdwP.h"
      35             : 
      36             : 
      37             : int
      38         478 : __libdw_addrx (Dwarf_CU *cu, Dwarf_Word idx, Dwarf_Addr *addr)
      39             : {
      40         478 :   Dwarf_Off addr_off = __libdw_cu_addr_base (cu);
      41         478 :   if (addr_off == (Dwarf_Off) -1)
      42             :     return -1;
      43             : 
      44         478 :   Dwarf *dbg = cu->dbg;
      45         478 :   if (dbg->sectiondata[IDX_debug_addr] == NULL)
      46             :     {
      47           0 :       __libdw_seterrno (DWARF_E_NO_DEBUG_ADDR);
      48           0 :       return -1;
      49             :     }
      50             : 
      51             :   /* The section should at least contain room for one address.  */
      52         478 :   int address_size = cu->address_size;
      53         478 :   if (cu->address_size > dbg->sectiondata[IDX_debug_addr]->d_size)
      54             :     {
      55           0 :     invalid_offset:
      56           0 :       __libdw_seterrno (DWARF_E_INVALID_OFFSET);
      57           0 :       return -1;
      58             :     }
      59             : 
      60         478 :   if (addr_off > (dbg->sectiondata[IDX_debug_addr]->d_size
      61         478 :                   - address_size))
      62             :     goto invalid_offset;
      63             : 
      64         478 :   idx *= address_size;
      65         478 :   if (idx > (dbg->sectiondata[IDX_debug_addr]->d_size
      66         478 :              - address_size - addr_off))
      67             :     goto invalid_offset;
      68             : 
      69             :   const unsigned char *datap;
      70         478 :   datap = dbg->sectiondata[IDX_debug_addr]->d_buf + addr_off + idx;
      71         478 :   if (address_size == 4)
      72           0 :     *addr = read_4ubyte_unaligned (dbg, datap);
      73             :   else
      74         478 :     *addr = read_8ubyte_unaligned (dbg, datap);
      75             : 
      76             :   return 0;
      77             : }
      78             : 
      79             : int
      80     1236015 : dwarf_formaddr (Dwarf_Attribute *attr, Dwarf_Addr *return_addr)
      81             : {
      82     1236015 :   if (attr == NULL)
      83             :     return -1;
      84             : 
      85             :   Dwarf_Word idx;
      86      309901 :   Dwarf_CU *cu = attr->cu;
      87      309901 :   Dwarf *dbg = cu->dbg;
      88      309901 :   const unsigned char *datap = attr->valp;
      89      309901 :   const unsigned char *endp = attr->cu->endp;
      90      309901 :   switch (attr->form)
      91             :     {
      92             :       /* There is one form that just encodes the whole address.  */
      93      272800 :       case DW_FORM_addr:
      94      272800 :         if (__libdw_read_address (dbg, cu_sec_idx (cu), datap,
      95      272800 :                                   cu->address_size, return_addr))
      96             :           return -1;
      97      272800 :         return 0;
      98             : 
      99             :       /* All others encode an index into the .debug_addr section where
     100             :          the address can be found.  */
     101         158 :       case DW_FORM_GNU_addr_index:
     102             :       case DW_FORM_addrx:
     103         158 :         if (datap >= endp)
     104             :           {
     105           0 :           invalid:
     106           0 :             __libdw_seterrno (DWARF_E_INVALID_DWARF);
     107           0 :             return -1;
     108             :           }
     109         158 :         get_uleb128 (idx, datap, endp);
     110         158 :         break;
     111             : 
     112           0 :       case DW_FORM_addrx1:
     113           0 :         if (datap >= endp - 1)
     114             :           goto invalid;
     115           0 :         idx = *datap;
     116           0 :         break;
     117             : 
     118           0 :       case DW_FORM_addrx2:
     119           0 :         if (datap >= endp - 2)
     120             :           goto invalid;
     121           0 :         idx = read_2ubyte_unaligned (dbg, datap);
     122             :         break;
     123             : 
     124           0 :       case DW_FORM_addrx3:
     125           0 :         if (datap >= endp - 3)
     126             :           goto invalid;
     127           0 :         idx = read_3ubyte_unaligned (dbg, datap);
     128           0 :         break;
     129             : 
     130           0 :       case DW_FORM_addrx4:
     131           0 :         if (datap >= endp - 4)
     132             :           goto invalid;
     133           0 :         idx = read_4ubyte_unaligned (dbg, datap);
     134             :         break;
     135             : 
     136       36943 :       default:
     137       36943 :         __libdw_seterrno (DWARF_E_NO_ADDR);
     138       36943 :         return -1;
     139             :     }
     140             : 
     141             :   /* So we got an index.  Lets see if it is valid and we can get the actual
     142             :      address.  */
     143         158 :   if (__libdw_addrx (cu, idx, return_addr) != 0)
     144             :     return -1;
     145             : 
     146         158 :   return 0;
     147             : }
     148             : INTDEF(dwarf_formaddr)