Branch data 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 : 1513780 : dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block) 40 : : { 41 [ - + ]: 1513780 : if (attr == NULL) 42 : : return -1; 43 : : 44 : 1513780 : const unsigned char *datap = attr->valp; 45 : 1513780 : const unsigned char *endp = attr->cu->endp; 46 : : 47 [ + - - + : 1513780 : switch (attr->form) - + ] 48 : : { 49 : 150 : case DW_FORM_block1: 50 [ - + ]: 150 : if (unlikely (endp - datap < 1)) 51 : 0 : goto invalid; 52 : 150 : return_block->length = *(uint8_t *) attr->valp; 53 : 150 : return_block->data = attr->valp + 1; 54 : 150 : break; 55 : : 56 : 0 : case DW_FORM_block2: 57 [ # # ]: 0 : if (unlikely (endp - datap < 2)) 58 : 0 : 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 : 0 : 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 : 455994 : case DW_FORM_block: 71 : : case DW_FORM_exprloc: 72 [ - + ]: 455994 : if (unlikely (endp - datap < 1)) 73 : 0 : goto invalid; 74 : 455994 : get_uleb128 (return_block->length, datap, endp); 75 : 455994 : return_block->data = (unsigned char *) datap; 76 : 455994 : 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 : 0 : goto invalid; 84 : 0 : return_block->length = 16; 85 : 0 : return_block->data = (unsigned char *) datap; 86 : 0 : break; 87 : : 88 : 1057636 : default: 89 : 1057636 : __libdw_seterrno (DWARF_E_NO_BLOCK); 90 : 1057636 : return -1; 91 : : } 92 : : 93 [ - + ]: 456144 : 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)