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1 : : /* Return reference offset represented by attribute. 2 : : Copyright (C) 2003-2010, 2014 Red Hat, Inc. 3 : : This file is part of elfutils. 4 : : Written by Ulrich Drepper <drepper@redhat.com>, 2003. 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 : : int 38 : : internal_function 39 : 6825416 : __libdw_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset) 40 : : { 41 : 6825416 : const unsigned char *datap = attr->valp; 42 : 6825416 : const unsigned char *endp = attr->cu->endp; 43 : : 44 [ - + ]: 6825416 : if (attr->valp == NULL) 45 : : { 46 : 0 : __libdw_seterrno (DWARF_E_INVALID_REFERENCE); 47 : 0 : return -1; 48 : : } 49 : : 50 [ + - + - : 6825416 : switch (attr->form) + - - ] 51 : : { 52 : 28 : case DW_FORM_ref1: 53 [ - + ]: 28 : if (datap + 1 > endp) 54 : : { 55 : 0 : invalid: 56 : 0 : __libdw_seterrno (DWARF_E_INVALID_DWARF); 57 : 0 : return -1; 58 : : } 59 : 28 : *return_offset = *attr->valp; 60 : 28 : break; 61 : : 62 : 0 : case DW_FORM_ref2: 63 [ # # ]: 0 : if (datap + 2 > endp) 64 : 0 : goto invalid; 65 [ # # ]: 0 : *return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp); 66 : 0 : break; 67 : : 68 : 6819234 : case DW_FORM_ref4: 69 [ - + ]: 6819234 : if (datap + 4 > endp) 70 : 0 : goto invalid; 71 [ + + ]: 6819234 : *return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp); 72 : 6819234 : break; 73 : : 74 : 0 : case DW_FORM_ref8: 75 [ # # ]: 0 : if (datap + 8 > endp) 76 : 0 : goto invalid; 77 [ # # ]: 0 : *return_offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp); 78 : 0 : break; 79 : : 80 : 6154 : case DW_FORM_ref_udata: 81 [ - + ]: 6154 : if (datap + 1 > endp) 82 : 0 : goto invalid; 83 : 6154 : get_uleb128 (*return_offset, datap, endp); 84 : 6154 : break; 85 : : 86 : 0 : case DW_FORM_ref_addr: 87 : : case DW_FORM_ref_sig8: 88 : : case DW_FORM_GNU_ref_alt: 89 : : case DW_FORM_ref_sup4: 90 : : case DW_FORM_ref_sup8: 91 : : /* These aren't handled by dwarf_formref, only by dwarf_formref_die. */ 92 : 0 : __libdw_seterrno (DWARF_E_INVALID_REFERENCE); 93 : 0 : return -1; 94 : : 95 : 0 : default: 96 : 0 : __libdw_seterrno (DWARF_E_NO_REFERENCE); 97 : 0 : return -1; 98 : : } 99 : : 100 : : return 0; 101 : : } 102 : : 103 : : /* This is the old public entry point. 104 : : It is now deprecated in favor of dwarf_formref_die. */ 105 : : int 106 : 0 : dwarf_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset) 107 : : { 108 [ # # ]: 0 : if (attr == NULL) 109 : : return -1; 110 : : 111 : 0 : return __libdw_formref (attr, return_offset); 112 : : }