/* Return block represented by attribute. Copyright (C) 2004-2010, 2014, 2018 Red Hat, Inc. This file is part of elfutils. Written by Ulrich Drepper , 2004. This file is free software; you can redistribute it and/or modify it under the terms of either * the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version or * the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version or both in parallel, as here. elfutils is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received copies of the GNU General Public License and the GNU Lesser General Public License along with this program. If not, see . */ #ifdef HAVE_CONFIG_H # include #endif #include #include "libdwP.h" int dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block) { if (attr == NULL) return -1; const unsigned char *datap = attr->valp; const unsigned char *endp = attr->cu->endp; switch (attr->form) { case DW_FORM_block1: if (unlikely (endp - datap < 1)) goto invalid; return_block->length = *(uint8_t *) attr->valp; return_block->data = attr->valp + 1; break; case DW_FORM_block2: if (unlikely (endp - datap < 2)) goto invalid; return_block->length = read_2ubyte_unaligned (attr->cu->dbg, attr->valp); return_block->data = attr->valp + 2; break; case DW_FORM_block4: if (unlikely (endp - datap < 4)) goto invalid; return_block->length = read_4ubyte_unaligned (attr->cu->dbg, attr->valp); return_block->data = attr->valp + 4; break; case DW_FORM_block: case DW_FORM_exprloc: if (unlikely (endp - datap < 1)) goto invalid; get_uleb128 (return_block->length, datap, endp); return_block->data = (unsigned char *) datap; break; case DW_FORM_data16: /* The DWARFv5 spec calls this constant class, but we interpret it as a block that the user will need to interpret when converting to a value. */ if (unlikely (endp - datap < 16)) goto invalid; return_block->length = 16; return_block->data = (unsigned char *) datap; break; default: __libdw_seterrno (DWARF_E_NO_BLOCK); return -1; } if (unlikely (return_block->length > (size_t) (endp - return_block->data))) { /* Block does not fit. */ invalid: __libdw_seterrno (DWARF_E_INVALID_DWARF); return -1; } return 0; } INTDEF(dwarf_formblock)