125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Iterate through modules. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2005, 2008 Red Hat, Inc. 325b3c049e70834cf33790a28643ab058b507b35cBen Cheng This file is part of Red Hat elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 625b3c049e70834cf33790a28643ab058b507b35cBen Cheng it under the terms of the GNU General Public License as published by the 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Free Software Foundation; version 2 of the License. 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 1025b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 1125b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1225b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 1325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1425b3c049e70834cf33790a28643ab058b507b35cBen Cheng You should have received a copy of the GNU General Public License along 1525b3c049e70834cf33790a28643ab058b507b35cBen Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 1625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 1725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1825b3c049e70834cf33790a28643ab058b507b35cBen Cheng In addition, as a special exception, Red Hat, Inc. gives You the 1925b3c049e70834cf33790a28643ab058b507b35cBen Cheng additional right to link the code of Red Hat elfutils with code licensed 2025b3c049e70834cf33790a28643ab058b507b35cBen Cheng under any Open Source Initiative certified open source license 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng (http://www.opensource.org/licenses/index.php) which requires the 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribution of source code with any binary distribution and to 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribute linked combinations of the two. Non-GPL Code permitted under 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng this exception must only link to the code of Red Hat elfutils through 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng those well defined interfaces identified in the file named EXCEPTION 2625b3c049e70834cf33790a28643ab058b507b35cBen Cheng found in the source code files (the "Approved Interfaces"). The files 2725b3c049e70834cf33790a28643ab058b507b35cBen Cheng of Non-GPL Code may instantiate templates or use macros or inline 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng functions from the Approved Interfaces without causing the resulting 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng work to be covered by the GNU General Public License. Only Red Hat, 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc. may make changes or additions to the list of Approved Interfaces. 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat's grant of this exception is conditioned upon your not adding 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng any new exceptions. If you wish to add a new Approved Interface or 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception, please contact Red Hat. You must obey the GNU General Public 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng License in all respects for all of the Red Hat elfutils code and other 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng code used in conjunction with Red Hat elfutils except the Non-GPL Code 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng covered by this exception. If you modify this file, you may extend this 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception to your version of the file, but you are not obligated to do 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng so. If you do not wish to provide this exception without modification, 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng you must delete this exception statement from your version and license 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng this file solely under the GPL without exception. 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is an included package of the Open Invention Network. 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng An included package of the Open Invention Network is a package for which 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Open Invention Network licensees cross-license their patents. No patent 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng license is granted, either expressly or impliedly, by designation as an 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng included package. Should you wish to participate in the Open Invention 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Network licensing program, please visit www.openinventionnetwork.com 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng <http://www.openinventionnetwork.com>. */ 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libdwflP.h" 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5225b3c049e70834cf33790a28643ab058b507b35cBen Chengptrdiff_t 5325b3c049e70834cf33790a28643ab058b507b35cBen Chengdwfl_getmodules (Dwfl *dwfl, 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng int (*callback) (Dwfl_Module *, void **, 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *, Dwarf_Addr, void *), 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng void *arg, 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng ptrdiff_t offset) 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (dwfl == NULL) 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* We iterate through the linked list when it's all we have. 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng But continuing from an offset is slow that way. So when 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng DWFL->lookup_module is populated, we can instead keep our 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng place by jumping directly into the array. Since the actions 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng of a callback could cause it to get populated, we must 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng choose the style of place-holder when we return an offset, 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng and we encode the choice in the low bits of that value. */ 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwfl_Module *m = dwfl->modulelist; 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if ((offset & 3) == 1) 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng offset >>= 2; 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng for (ptrdiff_t pos = 0; pos < offset; ++pos) 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (m == NULL) 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng m = m->next; 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng else if (((offset & 3) == 2) && likely (dwfl->lookup_module != NULL)) 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng offset >>= 2; 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if ((size_t) offset - 1 == dwfl->lookup_elts) 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return 0; 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely ((size_t) offset - 1 > dwfl->lookup_elts)) 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng m = dwfl->lookup_module[offset - 1]; 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (m == NULL)) 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng else if (offset != 0) 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdwfl_seterrno (DWFL_E_BADSTROFF); 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (m != NULL) 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng int ok = (*callback) (MODCB_ARGS (m), arg); 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng ++offset; 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng m = m->next; 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (ok != DWARF_CB_OK) 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ((dwfl->lookup_module == NULL) ? ((offset << 2) | 1) 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng : (((m == NULL ? (ptrdiff_t) dwfl->lookup_elts + 1 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng : m->segment + 1) << 2) | 2)); 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return 0; 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 11325b3c049e70834cf33790a28643ab058b507b35cBen ChengINTDEF (dwfl_getmodules) 114