| /* Return unsigned constant represented by attribute. |
| Copyright (C) 2003-2009 Red Hat, Inc. |
| This file is part of Red Hat elfutils. |
| Written by Ulrich Drepper <drepper@redhat.com>, 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 |
| <http://www.openinventionnetwork.com>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <dwarf.h> |
| #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, IDX_debug_info, attr->valp, |
| attr->cu->offset_size, &offset, sec_index, 0)) |
| return NULL; |
| } |
| else if (attr->cu->version > 3) |
| goto invalid; |
| |
| switch (attr->form) |
| { |
| case DW_FORM_data4: |
| case DW_FORM_data8: |
| if (__libdw_read_offset (attr->cu->dbg, IDX_debug_info, 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: |
| if (__libdw_read_address (attr->cu->dbg, IDX_debug_info, 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) |