125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Helper functions for form handling. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2003-2009 Red Hat, Inc. 325b3c049e70834cf33790a28643ab058b507b35cBen Cheng This file is part of Red Hat elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Written by Ulrich Drepper <drepper@redhat.com>, 2003. 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng it under the terms of the GNU General Public License as published by the 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Free Software Foundation; version 2 of the License. 925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 1125b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 1225b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1325b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 1425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1525b3c049e70834cf33790a28643ab058b507b35cBen Cheng You should have received a copy of the GNU General Public License along 1625b3c049e70834cf33790a28643ab058b507b35cBen Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 1725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 1825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1925b3c049e70834cf33790a28643ab058b507b35cBen Cheng In addition, as a special exception, Red Hat, Inc. gives You the 2025b3c049e70834cf33790a28643ab058b507b35cBen Cheng additional right to link the code of Red Hat elfutils with code licensed 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng under any Open Source Initiative certified open source license 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng (http://www.opensource.org/licenses/index.php) which requires the 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribution of source code with any binary distribution and to 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribute linked combinations of the two. Non-GPL Code permitted under 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng this exception must only link to the code of Red Hat elfutils through 2625b3c049e70834cf33790a28643ab058b507b35cBen Cheng those well defined interfaces identified in the file named EXCEPTION 2725b3c049e70834cf33790a28643ab058b507b35cBen Cheng found in the source code files (the "Approved Interfaces"). The files 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng of Non-GPL Code may instantiate templates or use macros or inline 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng functions from the Approved Interfaces without causing the resulting 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng work to be covered by the GNU General Public License. Only Red Hat, 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc. may make changes or additions to the list of Approved Interfaces. 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat's grant of this exception is conditioned upon your not adding 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng any new exceptions. If you wish to add a new Approved Interface or 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception, please contact Red Hat. You must obey the GNU General Public 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng License in all respects for all of the Red Hat elfutils code and other 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng code used in conjunction with Red Hat elfutils except the Non-GPL Code 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng covered by this exception. If you modify this file, you may extend this 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception to your version of the file, but you are not obligated to do 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng so. If you do not wish to provide this exception without modification, 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng you must delete this exception statement from your version and license 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng this file solely under the GPL without exception. 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is an included package of the Open Invention Network. 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng An included package of the Open Invention Network is a package for which 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Open Invention Network licensees cross-license their patents. No patent 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng license is granted, either expressly or impliedly, by designation as an 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng included package. Should you wish to participate in the Open Invention 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Network licensing program, please visit www.openinventionnetwork.com 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng <http://www.openinventionnetwork.com>. */ 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <dwarf.h> 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <string.h> 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libdwP.h" 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6125b3c049e70834cf33790a28643ab058b507b35cBen Chengsize_t 6225b3c049e70834cf33790a28643ab058b507b35cBen Chenginternal_function 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng__libdw_form_val_len (Dwarf *dbg, struct Dwarf_CU *cu, unsigned int form, 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng const unsigned char *valp) 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng const unsigned char *saved; 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Word u128; 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t result; 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (form) 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_addr: 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = cu->address_size; 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_ref_addr: 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = cu->version == 2 ? cu->address_size : cu->offset_size; 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_strp: 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_sec_offset: 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = cu->offset_size; 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_block1: 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = *valp + 1; 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_block2: 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = read_2ubyte_unaligned (dbg, valp) + 2; 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_block4: 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = read_4ubyte_unaligned (dbg, valp) + 4; 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_block: 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_exprloc: 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng saved = valp; 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng get_uleb128 (u128, valp); 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = u128 + (valp - saved); 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_flag_present: 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = 0; 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_ref1: 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_data1: 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_flag: 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = 1; 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_data2: 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_ref2: 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = 2; 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_data4: 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_ref4: 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = 4; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_data8: 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_ref8: 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_ref_sig8: 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = 8; 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_string: 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = strlen ((char *) valp) + 1; 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_sdata: 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_udata: 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_ref_udata: 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng saved = valp; 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng get_uleb128 (u128, valp); 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = valp - saved; 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DW_FORM_indirect: 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng saved = valp; 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng get_uleb128 (u128, valp); 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng // XXX Is this really correct? 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = __libdw_form_val_len (dbg, cu, u128, valp); 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (result != (size_t) -1) 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng result += valp - saved; 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_INVALID_DWARF); 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = (size_t) -1l; 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return result; 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 159