Branch data     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                 :        1564 : __libdw_addrx (Dwarf_CU *cu, Dwarf_Word idx, Dwarf_Addr *addr)
      39                 :             : {
      40                 :        1564 :   Dwarf_Off addr_off = __libdw_cu_addr_base (cu);
      41         [ -  + ]:        1564 :   if (addr_off == (Dwarf_Off) -1)
      42                 :             :     return -1;
      43                 :             : 
      44                 :        1564 :   Dwarf *dbg = cu->dbg;
      45         [ -  + ]:        1564 :   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                 :        1564 :   int address_size = cu->address_size;
      53         [ -  + ]:        1564 :   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                 :        1564 :   if (addr_off > (dbg->sectiondata[IDX_debug_addr]->d_size
      61         [ -  + ]:        1564 :                   - address_size))
      62                 :           0 :     goto invalid_offset;
      63                 :             : 
      64                 :        1564 :   idx *= address_size;
      65                 :        1564 :   if (idx > (dbg->sectiondata[IDX_debug_addr]->d_size
      66         [ -  + ]:        1564 :              - address_size - addr_off))
      67                 :           0 :     goto invalid_offset;
      68                 :             : 
      69                 :        1564 :   const unsigned char *datap;
      70                 :        1564 :   datap = dbg->sectiondata[IDX_debug_addr]->d_buf + addr_off + idx;
      71         [ +  + ]:        1564 :   if (address_size == 4)
      72         [ -  + ]:          40 :     *addr = read_4ubyte_unaligned (dbg, datap);
      73                 :             :   else
      74         [ -  + ]:        1524 :     *addr = read_8ubyte_unaligned (dbg, datap);
      75                 :             : 
      76                 :             :   return 0;
      77                 :             : }
      78                 :             : 
      79                 :             : int
      80                 :     1893622 : dwarf_formaddr (Dwarf_Attribute *attr, Dwarf_Addr *return_addr)
      81                 :             : {
      82         [ +  + ]:     1893622 :   if (attr == NULL)
      83                 :             :     return -1;
      84                 :             : 
      85                 :      373844 :   Dwarf_Word idx;
      86                 :      373844 :   Dwarf_CU *cu = attr->cu;
      87                 :      373844 :   Dwarf *dbg = cu->dbg;
      88                 :      373844 :   const unsigned char *datap = attr->valp;
      89                 :      373844 :   const unsigned char *endp = attr->cu->endp;
      90   [ +  +  -  -  :      373844 :   switch (attr->form)
                -  -  + ]
      91                 :             :     {
      92                 :             :       /* There is one form that just encodes the whole address.  */
      93                 :      309758 :       case DW_FORM_addr:
      94         [ -  + ]:      309758 :         if (__libdw_read_address (dbg, cu_sec_idx (cu), datap,
      95                 :      309758 :                                   cu->address_size, return_addr))
      96                 :             :           return -1;
      97                 :             :         return 0;
      98                 :             : 
      99                 :             :       /* All others encode an index into the .debug_addr section where
     100                 :             :          the address can be found.  */
     101                 :         508 :       case DW_FORM_GNU_addr_index:
     102                 :             :       case DW_FORM_addrx:
     103         [ -  + ]:         508 :         if (datap >= endp)
     104                 :             :           {
     105                 :           0 :           invalid:
     106                 :           0 :             __libdw_seterrno (DWARF_E_INVALID_DWARF);
     107                 :           0 :             return -1;
     108                 :             :           }
     109                 :         508 :         get_uleb128 (idx, datap, endp);
     110                 :         508 :         break;
     111                 :             : 
     112                 :           0 :       case DW_FORM_addrx1:
     113         [ #  # ]:           0 :         if (datap >= endp - 1)
     114                 :           0 :           goto invalid;
     115                 :           0 :         idx = *datap;
     116                 :           0 :         break;
     117                 :             : 
     118                 :           0 :       case DW_FORM_addrx2:
     119         [ #  # ]:           0 :         if (datap >= endp - 2)
     120                 :           0 :           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                 :           0 :           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                 :           0 :           goto invalid;
     133         [ #  # ]:           0 :         idx = read_4ubyte_unaligned (dbg, datap);
     134                 :             :         break;
     135                 :             : 
     136                 :       63578 :       default:
     137                 :       63578 :         __libdw_seterrno (DWARF_E_NO_ADDR);
     138                 :       63578 :         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         [ -  + ]:         508 :   if (__libdw_addrx (cu, idx, return_addr) != 0)
     144                 :             :     return -1;
     145                 :             : 
     146                 :             :   return 0;
     147                 :             : }
     148                 :             : INTDEF(dwarf_formaddr)