/* Return unsigned constant represented by attribute. Copyright (C) 2003-2012 Red Hat, Inc. This file is part of Red Hat elfutils. Written by Ulrich Drepper , 2003. Red Hat elfutils is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. Red Hat 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 a copy of the GNU General Public License along with Red Hat elfutils; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. In addition, as a special exception, Red Hat, Inc. gives You the additional right to link the code of Red Hat elfutils with code licensed under any Open Source Initiative certified open source license (http://www.opensource.org/licenses/index.php) which requires the distribution of source code with any binary distribution and to distribute linked combinations of the two. Non-GPL Code permitted under this exception must only link to the code of Red Hat elfutils through those well defined interfaces identified in the file named EXCEPTION found in the source code files (the "Approved Interfaces"). The files of Non-GPL Code may instantiate templates or use macros or inline functions from the Approved Interfaces without causing the resulting work to be covered by the GNU General Public License. Only Red Hat, Inc. may make changes or additions to the list of Approved Interfaces. Red Hat's grant of this exception is conditioned upon your not adding any new exceptions. If you wish to add a new Approved Interface or exception, please contact Red Hat. You must obey the GNU General Public License in all respects for all of the Red Hat elfutils code and other code used in conjunction with Red Hat elfutils except the Non-GPL Code covered by this exception. If you modify this file, you may extend this exception to your version of the file, but you are not obligated to do so. If you do not wish to provide this exception without modification, you must delete this exception statement from your version and license this file solely under the GPL without exception. Red Hat elfutils is an included package of the Open Invention Network. An included package of the Open Invention Network is a package for which Open Invention Network licensees cross-license their patents. No patent license is granted, either expressly or impliedly, by designation as an included package. Should you wish to participate in the Open Invention Network licensing program, please visit www.openinventionnetwork.com . */ #ifdef HAVE_CONFIG_H # include #endif #include #include "libdwP.h" internal_function unsigned char * __libdw_formptr (Dwarf_Attribute *attr, int sec_index, int err_nodata, unsigned char **endpp, Dwarf_Off *offsetp) { if (attr == NULL) return NULL; const Elf_Data *d = attr->cu->dbg->sectiondata[sec_index]; if (unlikely (d == NULL)) { __libdw_seterrno (err_nodata); return NULL; } Dwarf_Word offset; if (attr->form == DW_FORM_sec_offset) { if (__libdw_read_offset (attr->cu->dbg, cu_sec_idx (attr->cu), attr->valp, attr->cu->offset_size, &offset, sec_index, 0)) return NULL; } else if (attr->cu->version > 3) goto invalid; else switch (attr->form) { case DW_FORM_data4: case DW_FORM_data8: if (__libdw_read_offset (attr->cu->dbg, cu_sec_idx (attr->cu), attr->valp, attr->form == DW_FORM_data4 ? 4 : 8, &offset, sec_index, 0)) return NULL; break; default: if (INTUSE(dwarf_formudata) (attr, &offset)) return NULL; }; unsigned char *readp = d->d_buf + offset; unsigned char *endp = d->d_buf + d->d_size; if (unlikely (readp >= endp)) { invalid: __libdw_seterrno (DWARF_E_INVALID_DWARF); return NULL; } if (endpp != NULL) *endpp = endp; if (offsetp != NULL) *offsetp = offset; return readp; } int dwarf_formudata (attr, return_uval) Dwarf_Attribute *attr; Dwarf_Word *return_uval; { if (attr == NULL) return -1; const unsigned char *datap; switch (attr->form) { case DW_FORM_data1: *return_uval = *attr->valp; break; case DW_FORM_data2: *return_uval = read_2ubyte_unaligned (attr->cu->dbg, attr->valp); break; case DW_FORM_data4: case DW_FORM_data8: case DW_FORM_sec_offset: /* Before DWARF4 data4 and data8 are pure constants unless the attribute also allows offsets (*ptr classes), since DWARF4 they are always just constants (start_scope is special though, since it only could express a rangelist since DWARF4). */ if (attr->form == DW_FORM_sec_offset || (attr->cu->version < 4 && attr->code != DW_AT_start_scope)) { switch (attr->code) { case DW_AT_data_member_location: case DW_AT_frame_base: case DW_AT_location: case DW_AT_return_addr: case DW_AT_segment: case DW_AT_static_link: case DW_AT_string_length: case DW_AT_use_location: case DW_AT_vtable_elem_location: /* loclistptr */ if (__libdw_formptr (attr, IDX_debug_loc, DWARF_E_NO_LOCLIST, NULL, return_uval) == NULL) return -1; break; case DW_AT_macro_info: /* macptr */ if (__libdw_formptr (attr, IDX_debug_macinfo, DWARF_E_NO_ENTRY, NULL, return_uval) == NULL) return -1; break; case DW_AT_ranges: case DW_AT_start_scope: /* rangelistptr */ if (__libdw_formptr (attr, IDX_debug_ranges, DWARF_E_NO_DEBUG_RANGES, NULL, return_uval) == NULL) return -1; break; case DW_AT_stmt_list: /* lineptr */ if (__libdw_formptr (attr, IDX_debug_line, DWARF_E_NO_DEBUG_LINE, NULL, return_uval) == NULL) return -1; break; default: /* sec_offset can only be used by one of the above attrs. */ if (attr->form == DW_FORM_sec_offset) { __libdw_seterrno (DWARF_E_INVALID_DWARF); return -1; } /* Not one of the special attributes, just a constant. */ if (__libdw_read_address (attr->cu->dbg, cu_sec_idx (attr->cu), attr->valp, attr->form == DW_FORM_data4 ? 4 : 8, return_uval)) return -1; break; } } else { /* We are dealing with a constant data4 or data8. */ if (__libdw_read_address (attr->cu->dbg, cu_sec_idx (attr->cu), attr->valp, attr->form == DW_FORM_data4 ? 4 : 8, return_uval)) return -1; } break; case DW_FORM_sdata: datap = attr->valp; get_sleb128 (*return_uval, datap); break; case DW_FORM_udata: datap = attr->valp; get_uleb128 (*return_uval, datap); break; default: __libdw_seterrno (DWARF_E_NO_CONSTANT); return -1; } return 0; } INTDEF(dwarf_formudata)