125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Find entry breakpoint locations for a function. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2005-2009 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#ifdef HAVE_CONFIG_H 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libdwP.h" 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <dwarf.h> 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stdlib.h> 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5825b3c049e70834cf33790a28643ab058b507b35cBen Chengint 5925b3c049e70834cf33790a28643ab058b507b35cBen Chengdwarf_entry_breakpoints (die, bkpts) 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Die *die; 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr **bkpts; 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng int nbkpts = 0; 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng *bkpts = NULL; 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Add one breakpoint location to the result vector. */ 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng inline int add_bkpt (Dwarf_Addr pc) 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr *newlist = realloc (*bkpts, ++nbkpts * sizeof newlist[0]); 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (newlist == NULL) 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng free (*bkpts); 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng *bkpts = NULL; 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_NOMEM); 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng newlist[nbkpts - 1] = pc; 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng *bkpts = newlist; 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return nbkpts; 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Fallback result, break at the entrypc/lowpc value. */ 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng inline int entrypc_bkpt (void) 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr pc; 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return INTUSE(dwarf_entrypc) (die, &pc) < 0 ? -1 : add_bkpt (pc); 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Fetch the CU's line records to look for this DIE's addresses. */ 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Die cudie = CUDIE (die->cu); 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Lines *lines; 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t nlines; 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (INTUSE(dwarf_getsrclines) (&cudie, &lines, &nlines) < 0) 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng int error = INTUSE (dwarf_errno) (); 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (error == 0) /* CU has no DW_AT_stmt_list. */ 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return entrypc_bkpt (); 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (error); 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Search a contiguous PC range for prologue-end markers. 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng If DWARF, look for proper markers. 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Failing that, if ADHOC, look for the ad hoc convention. */ 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng inline int search_range (Dwarf_Addr low, Dwarf_Addr high, 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng bool dwarf, bool adhoc) 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t l = 0, u = nlines; 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (l < u) 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t idx = (l + u) / 2; 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (lines->info[idx].addr < low) 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng l = idx + 1; 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng else if (lines->info[idx].addr > low) 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng u = idx; 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng else if (lines->info[idx].end_sequence) 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng l = idx + 1; 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng l = idx; 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (l < u) 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (dwarf) 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng for (size_t i = l; i < u && lines->info[i].addr < high; ++i) 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (lines->info[i].prologue_end 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng && add_bkpt (lines->info[i].addr) < 0) 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (adhoc && nbkpts == 0) 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (++l < nlines && lines->info[l].addr < high) 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (!lines->info[l].end_sequence) 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return add_bkpt (lines->info[l].addr); 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return nbkpts; 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_INVALID_DWARF); 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Search each contiguous address range for DWARF prologue_end markers. */ 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr base; 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr begin; 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr end; 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng ptrdiff_t offset = INTUSE(dwarf_ranges) (die, 0, &base, &begin, &end); 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (offset < 0) 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Most often there is a single contiguous PC range for the DIE. */ 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (offset == 1) 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return search_range (begin, end, true, true) ?: entrypc_bkpt (); 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr lowpc = (Dwarf_Addr) -1l; 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr highpc = (Dwarf_Addr) -1l; 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (offset > 0) 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* We have an address range entry. */ 15925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (search_range (begin, end, true, false) < 0) 16025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return -1; 16125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (begin < lowpc) 16325b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 16425b3c049e70834cf33790a28643ab058b507b35cBen Cheng lowpc = begin; 16525b3c049e70834cf33790a28643ab058b507b35cBen Cheng highpc = end; 16625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 16725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16825b3c049e70834cf33790a28643ab058b507b35cBen Cheng offset = INTUSE(dwarf_ranges) (die, offset, &base, &begin, &end); 16925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 17025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17125b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* If we didn't find any proper DWARF markers, then look in the 17225b3c049e70834cf33790a28643ab058b507b35cBen Cheng lowest-addressed range for an ad hoc marker. Failing that, 17325b3c049e70834cf33790a28643ab058b507b35cBen Cheng fall back to just using the entrypc value. */ 17425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (nbkpts 17525b3c049e70834cf33790a28643ab058b507b35cBen Cheng ?: (lowpc == (Dwarf_Addr) -1l ? 0 17625b3c049e70834cf33790a28643ab058b507b35cBen Cheng : search_range (lowpc, highpc, false, true)) 17725b3c049e70834cf33790a28643ab058b507b35cBen Cheng ?: entrypc_bkpt ()); 17825b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 179